diff options
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 5452 |
1 files changed, 2962 insertions, 2490 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 1e57eafa6910..9315ba18310d 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * xHCI host controller driver * @@ -5,19 +6,6 @@ * * Author: Sarah Sharp * Some code borrowed from the Linux EHCI driver. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY - * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software Foundation, - * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* @@ -64,13 +52,17 @@ * endpoint rings; it generates events on the event ring for these. */ +#include <linux/jiffies.h> #include <linux/scatterlist.h> #include <linux/slab.h> +#include <linux/string_choices.h> +#include <linux/dma-mapping.h> #include "xhci.h" +#include "xhci-trace.h" -static int handle_cmd_in_cmd_wait_list(struct xhci_hcd *xhci, - struct xhci_virt_device *virt_dev, - struct xhci_event_cmd *event); +static int queue_command(struct xhci_hcd *xhci, struct xhci_command *cmd, + u32 field1, u32 field2, + u32 field3, u32 field4, bool command_must_succeed); /* * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA @@ -85,53 +77,102 @@ dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, return 0; /* offset in TRBs */ segment_offset = trb - seg->trbs; - if (segment_offset > TRBS_PER_SEGMENT) + if (segment_offset >= TRBS_PER_SEGMENT) return 0; return seg->dma + (segment_offset * sizeof(*trb)); } -/* Does this link TRB point to the first segment in a ring, - * or was the previous TRB the last TRB on the last segment in the ERST? - */ -static bool last_trb_on_last_seg(struct xhci_hcd *xhci, struct xhci_ring *ring, - struct xhci_segment *seg, union xhci_trb *trb) +static union xhci_trb *xhci_dma_to_trb(struct xhci_segment *start_seg, + dma_addr_t dma, + struct xhci_segment **match_seg) { - if (ring == xhci->event_ring) - return (trb == &seg->trbs[TRBS_PER_SEGMENT]) && - (seg->next == xhci->event_ring->first_seg); - else - return le32_to_cpu(trb->link.control) & LINK_TOGGLE; + struct xhci_segment *seg; + + xhci_for_each_ring_seg(start_seg, seg) { + if (in_range(dma, seg->dma, TRB_SEGMENT_SIZE)) { + if (match_seg) + *match_seg = seg; + return &seg->trbs[(dma - seg->dma) / sizeof(union xhci_trb)]; + } + } + + return NULL; } -/* Is this TRB a link TRB or was the last TRB the last TRB in this event ring - * segment? I.e. would the updated event TRB pointer step off the end of the - * event seg? - */ -static int last_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, - struct xhci_segment *seg, union xhci_trb *trb) +static bool trb_is_noop(union xhci_trb *trb) { - if (ring == xhci->event_ring) - return trb == &seg->trbs[TRBS_PER_SEGMENT]; - else - return TRB_TYPE_LINK_LE32(trb->link.control); + return TRB_TYPE_NOOP_LE32(trb->generic.field[3]); } -static int enqueue_is_link_trb(struct xhci_ring *ring) +static bool trb_is_link(union xhci_trb *trb) { - struct xhci_link_trb *link = &ring->enqueue->link; - return TRB_TYPE_LINK_LE32(link->control); + return TRB_TYPE_LINK_LE32(trb->link.control); +} + +static bool last_trb_on_seg(struct xhci_segment *seg, union xhci_trb *trb) +{ + return trb == &seg->trbs[TRBS_PER_SEGMENT - 1]; +} + +static bool last_trb_on_ring(struct xhci_ring *ring, + struct xhci_segment *seg, union xhci_trb *trb) +{ + return last_trb_on_seg(seg, trb) && (seg->next == ring->first_seg); +} + +static bool link_trb_toggles_cycle(union xhci_trb *trb) +{ + return le32_to_cpu(trb->link.control) & LINK_TOGGLE; +} + +static bool last_td_in_urb(struct xhci_td *td) +{ + struct urb_priv *urb_priv = td->urb->hcpriv; + + return urb_priv->num_tds_done == urb_priv->num_tds; +} + +static bool unhandled_event_trb(struct xhci_ring *ring) +{ + return ((le32_to_cpu(ring->dequeue->event_cmd.flags) & TRB_CYCLE) == + ring->cycle_state); +} + +static void inc_td_cnt(struct urb *urb) +{ + struct urb_priv *urb_priv = urb->hcpriv; + + urb_priv->num_tds_done++; +} + +static void trb_to_noop(union xhci_trb *trb, u32 noop_type, bool unchain_links) +{ + if (trb_is_link(trb)) { + if (unchain_links) + trb->link.control &= cpu_to_le32(~TRB_CHAIN); + } else { + trb->generic.field[0] = 0; + trb->generic.field[1] = 0; + trb->generic.field[2] = 0; + /* Preserve only the cycle bit of this TRB */ + trb->generic.field[3] &= cpu_to_le32(TRB_CYCLE); + trb->generic.field[3] |= cpu_to_le32(TRB_TYPE(noop_type)); + } +} + +static unsigned int trb_to_pos(struct xhci_segment *seg, union xhci_trb *trb) +{ + return seg->num * TRBS_PER_SEGMENT + (trb - seg->trbs); } /* Updates trb to point to the next TRB in the ring, and updates seg if the next * TRB is in a new segment. This does not skip over link TRBs, and it does not * effect the ring dequeue or enqueue pointers. */ -static void next_trb(struct xhci_hcd *xhci, - struct xhci_ring *ring, - struct xhci_segment **seg, - union xhci_trb **trb) +static void next_trb(struct xhci_segment **seg, + union xhci_trb **trb) { - if (last_trb(xhci, ring, *seg, *trb)) { + if (trb_is_link(*trb) || last_trb_on_seg(*seg, *trb)) { *seg = (*seg)->next; *trb = ((*seg)->trbs); } else { @@ -141,58 +182,101 @@ static void next_trb(struct xhci_hcd *xhci, /* * See Cycle bit rules. SW is the consumer for the event ring only. - * Don't make a ring full of link TRBs. That would be dumb and this would loop. */ -static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring) +void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring) { - unsigned long long addr; + unsigned int link_trb_count = 0; - ring->deq_updates++; + /* event ring doesn't have link trbs, check for last trb */ + if (ring->type == TYPE_EVENT) { + if (!last_trb_on_seg(ring->deq_seg, ring->dequeue)) { + ring->dequeue++; + return; + } + if (last_trb_on_ring(ring, ring->deq_seg, ring->dequeue)) + ring->cycle_state ^= 1; + ring->deq_seg = ring->deq_seg->next; + ring->dequeue = ring->deq_seg->trbs; - /* - * If this is not event ring, and the dequeue pointer - * is not on a link TRB, there is one more usable TRB - */ - if (ring->type != TYPE_EVENT && - !last_trb(xhci, ring, ring->deq_seg, ring->dequeue)) - ring->num_trbs_free++; + trace_xhci_inc_deq(ring); + + return; + } + + /* All other rings have link trbs */ + if (!trb_is_link(ring->dequeue)) { + if (last_trb_on_seg(ring->deq_seg, ring->dequeue)) + xhci_warn(xhci, "Missing link TRB at end of segment\n"); + else + ring->dequeue++; + } + + while (trb_is_link(ring->dequeue)) { + ring->deq_seg = ring->deq_seg->next; + ring->dequeue = ring->deq_seg->trbs; + + trace_xhci_inc_deq(ring); + + if (link_trb_count++ > ring->num_segs) { + xhci_warn(xhci, "Ring is an endless link TRB loop\n"); + break; + } + } + return; +} + +/* + * If enqueue points at a link TRB, follow links until an ordinary TRB is reached. + * Toggle the cycle bit of passed link TRBs and optionally chain them. + */ +static void inc_enq_past_link(struct xhci_hcd *xhci, struct xhci_ring *ring, u32 chain) +{ + unsigned int link_trb_count = 0; + + while (trb_is_link(ring->enqueue)) { - do { /* - * Update the dequeue pointer further if that was a link TRB or - * we're at the end of an event ring segment (which doesn't have - * link TRBS) + * Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit + * set, but other sections talk about dealing with the chain bit set. This was + * fixed in the 0.96 specification errata, but we have to assume that all 0.95 + * xHCI hardware can't handle the chain bit being cleared on a link TRB. + * + * On 0.95 and some 0.96 HCs the chain bit is set once at segment initalization + * and never changed here. On all others, modify it as requested by the caller. */ - if (last_trb(xhci, ring, ring->deq_seg, ring->dequeue)) { - if (ring->type == TYPE_EVENT && - last_trb_on_last_seg(xhci, ring, - ring->deq_seg, ring->dequeue)) { - ring->cycle_state = (ring->cycle_state ? 0 : 1); - } - ring->deq_seg = ring->deq_seg->next; - ring->dequeue = ring->deq_seg->trbs; - } else { - ring->dequeue++; + if (!xhci_link_chain_quirk(xhci, ring->type)) { + ring->enqueue->link.control &= cpu_to_le32(~TRB_CHAIN); + ring->enqueue->link.control |= cpu_to_le32(chain); } - } while (last_trb(xhci, ring, ring->deq_seg, ring->dequeue)); - addr = (unsigned long long) xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue); + /* Give this link TRB to the hardware */ + wmb(); + ring->enqueue->link.control ^= cpu_to_le32(TRB_CYCLE); + + /* Toggle the cycle bit after the last ring segment. */ + if (link_trb_toggles_cycle(ring->enqueue)) + ring->cycle_state ^= 1; + + ring->enq_seg = ring->enq_seg->next; + ring->enqueue = ring->enq_seg->trbs; + + trace_xhci_inc_enq(ring); + + if (link_trb_count++ > ring->num_segs) { + xhci_warn(xhci, "Link TRB loop at enqueue\n"); + break; + } + } } /* * See Cycle bit rules. SW is the consumer for the event ring only. - * Don't make a ring full of link TRBs. That would be dumb and this would loop. * * If we've just enqueued a TRB that is in the middle of a TD (meaning the * chain bit is set), then set the chain bit in all the following link TRBs. * If we've enqueued the last TRB in a TD, make sure the following link TRBs * have their chain bit cleared (so that each Link TRB is a separate TD). * - * Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit - * set, but other sections talk about dealing with the chain bit set. This was - * fixed in the 0.96 specification errata, but we have to assume that all 0.95 - * xHCI hardware can't handle the chain bit being cleared on a link TRB. - * * @more_trbs_coming: Will you enqueue more TRBs before calling * prepare_transfer()? */ @@ -200,81 +284,138 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool more_trbs_coming) { u32 chain; - union xhci_trb *next; - unsigned long long addr; chain = le32_to_cpu(ring->enqueue->generic.field[3]) & TRB_CHAIN; - /* If this is not event ring, there is one less usable TRB */ - if (ring->type != TYPE_EVENT && - !last_trb(xhci, ring, ring->enq_seg, ring->enqueue)) - ring->num_trbs_free--; - next = ++(ring->enqueue); - - ring->enq_updates++; - /* Update the dequeue pointer further if that was a link TRB or we're at - * the end of an event ring segment (which doesn't have link TRBS) + + if (last_trb_on_seg(ring->enq_seg, ring->enqueue)) { + xhci_err(xhci, "Tried to move enqueue past ring segment\n"); + return; + } + + ring->enqueue++; + + /* + * If we are in the middle of a TD or the caller plans to enqueue more + * TDs as one transfer (eg. control), traverse any link TRBs right now. + * Otherwise, enqueue can stay on a link until the next prepare_ring(). + * This avoids enqueue entering deq_seg and simplifies ring expansion. */ - while (last_trb(xhci, ring, ring->enq_seg, next)) { - if (ring->type != TYPE_EVENT) { - /* - * If the caller doesn't plan on enqueueing more - * TDs before ringing the doorbell, then we - * don't want to give the link TRB to the - * hardware just yet. We'll give the link TRB - * back in prepare_ring() just before we enqueue - * the TD at the top of the ring. - */ - if (!chain && !more_trbs_coming) - break; + if (trb_is_link(ring->enqueue) && (chain || more_trbs_coming)) + inc_enq_past_link(xhci, ring, chain); +} - /* If we're not dealing with 0.95 hardware or - * isoc rings on AMD 0.96 host, - * carry over the chain bit of the previous TRB - * (which may mean the chain bit is cleared). - */ - if (!(ring->type == TYPE_ISOC && - (xhci->quirks & XHCI_AMD_0x96_HOST)) - && !xhci_link_trb_quirk(xhci)) { - next->link.control &= - cpu_to_le32(~TRB_CHAIN); - next->link.control |= - cpu_to_le32(chain); - } - /* Give this link TRB to the hardware */ - wmb(); - next->link.control ^= cpu_to_le32(TRB_CYCLE); +static bool dma_in_range(dma_addr_t dma, + struct xhci_segment *start_seg, union xhci_trb *start_trb, + struct xhci_segment *end_seg, union xhci_trb *end_trb) +{ + unsigned int pos, start, end; + struct xhci_segment *pos_seg; + union xhci_trb *pos_trb = xhci_dma_to_trb(start_seg, dma, &pos_seg); - /* Toggle the cycle bit after the last ring segment. */ - if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) { - ring->cycle_state = (ring->cycle_state ? 0 : 1); - } - } - ring->enq_seg = ring->enq_seg->next; - ring->enqueue = ring->enq_seg->trbs; - next = ring->enqueue; + /* Is the trb dma address even part of the whole ring? */ + if (!pos_trb) + return false; + + pos = trb_to_pos(pos_seg, pos_trb); + start = trb_to_pos(start_seg, start_trb); + end = trb_to_pos(end_seg, end_trb); + + /* end position is smaller than start, search range wraps around */ + if (end < start) + return !(pos > end && pos < start); + + return (pos >= start && pos <= end); +} + +/* If the suspect DMA address is a TRB in this TD, this function returns true */ +static bool trb_in_td(struct xhci_td *td, dma_addr_t suspect_dma) +{ + return dma_in_range(suspect_dma, td->start_seg, td->start_trb, + td->end_seg, td->end_trb); +} + +/* + * Return number of free normal TRBs from enqueue to dequeue pointer on ring. + * Not counting an assumed link TRB at end of each TRBS_PER_SEGMENT sized segment. + * Only for transfer and command rings where driver is the producer, not for + * event rings. + */ +static unsigned int xhci_num_trbs_free(struct xhci_ring *ring) +{ + struct xhci_segment *enq_seg = ring->enq_seg; + union xhci_trb *enq = ring->enqueue; + union xhci_trb *last_on_seg; + unsigned int free = 0; + int i = 0; + + /* Ring might be empty even if enq != deq if enq is left on a link trb */ + if (trb_is_link(enq)) { + enq_seg = enq_seg->next; + enq = enq_seg->trbs; } - addr = (unsigned long long) xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue); + + /* Empty ring, common case, don't walk the segments */ + if (enq == ring->dequeue) + return ring->num_segs * (TRBS_PER_SEGMENT - 1); + + do { + if (ring->deq_seg == enq_seg && ring->dequeue >= enq) + return free + (ring->dequeue - enq); + last_on_seg = &enq_seg->trbs[TRBS_PER_SEGMENT - 1]; + free += last_on_seg - enq; + enq_seg = enq_seg->next; + enq = enq_seg->trbs; + } while (i++ < ring->num_segs); + + return free; } /* * Check to see if there's room to enqueue num_trbs on the ring and make sure * enqueue pointer will not advance into dequeue segment. See rules above. + * return number of new segments needed to ensure this. */ -static inline int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring, - unsigned int num_trbs) + +static unsigned int xhci_ring_expansion_needed(struct xhci_hcd *xhci, struct xhci_ring *ring, + unsigned int num_trbs) { - int num_trbs_in_deq_seg; + struct xhci_segment *seg; + int trbs_past_seg; + int enq_used; + int new_segs; + + enq_used = ring->enqueue - ring->enq_seg->trbs; - if (ring->num_trbs_free < num_trbs) + /* how many trbs will be queued past the enqueue segment? */ + trbs_past_seg = enq_used + num_trbs - (TRBS_PER_SEGMENT - 1); + + /* + * Consider expanding the ring already if num_trbs fills the current + * segment (i.e. trbs_past_seg == 0), not only when num_trbs goes into + * the next segment. Avoids confusing full ring with special empty ring + * case below + */ + if (trbs_past_seg < 0) + return 0; + + /* Empty ring special case, enqueue stuck on link trb while dequeue advanced */ + if (trb_is_link(ring->enqueue) && ring->enq_seg->next->trbs == ring->dequeue) return 0; - if (ring->type != TYPE_COMMAND && ring->type != TYPE_EVENT) { - num_trbs_in_deq_seg = ring->dequeue - ring->deq_seg->trbs; - if (ring->num_trbs_free < num_trbs + num_trbs_in_deq_seg) - return 0; + new_segs = 1 + (trbs_past_seg / (TRBS_PER_SEGMENT - 1)); + seg = ring->enq_seg; + + while (new_segs > 0) { + seg = seg->next; + if (seg == ring->deq_seg) { + xhci_dbg(xhci, "Adding %d trbs requires expanding ring by %d segments\n", + num_trbs, new_segs); + return new_segs; + } + new_segs--; } - return 1; + return 0; } /* Ring the host controller doorbell after placing a command on the ring */ @@ -284,117 +425,125 @@ void xhci_ring_cmd_db(struct xhci_hcd *xhci) return; xhci_dbg(xhci, "// Ding dong!\n"); - xhci_writel(xhci, DB_VALUE_HOST, &xhci->dba->doorbell[0]); + + trace_xhci_ring_host_doorbell(0, DB_VALUE_HOST); + + writel(DB_VALUE_HOST, &xhci->dba->doorbell[0]); /* Flush PCI posted writes */ - xhci_readl(xhci, &xhci->dba->doorbell[0]); + readl(&xhci->dba->doorbell[0]); } -static int xhci_abort_cmd_ring(struct xhci_hcd *xhci) +static bool xhci_mod_cmd_timer(struct xhci_hcd *xhci) { - u64 temp_64; - int ret; + return mod_delayed_work(system_percpu_wq, &xhci->cmd_timer, + msecs_to_jiffies(xhci->current_cmd->timeout_ms)); +} - xhci_dbg(xhci, "Abort command ring\n"); +static struct xhci_command *xhci_next_queued_cmd(struct xhci_hcd *xhci) +{ + return list_first_entry_or_null(&xhci->cmd_list, struct xhci_command, + cmd_list); +} - if (!(xhci->cmd_ring_state & CMD_RING_STATE_RUNNING)) { - xhci_dbg(xhci, "The command ring isn't running, " - "Have the command ring been stopped?\n"); - return 0; - } +/* + * Turn all commands on command ring with status set to "aborted" to no-op trbs. + * If there are other commands waiting then restart the ring and kick the timer. + * This must be called with command ring stopped and xhci->lock held. + */ +static void xhci_handle_stopped_cmd_ring(struct xhci_hcd *xhci, + struct xhci_command *cur_cmd) +{ + struct xhci_command *i_cmd; - temp_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); - if (!(temp_64 & CMD_RING_RUNNING)) { - xhci_dbg(xhci, "Command ring had been stopped\n"); - return 0; - } - xhci->cmd_ring_state = CMD_RING_STATE_ABORTED; - xhci_write_64(xhci, temp_64 | CMD_RING_ABORT, - &xhci->op_regs->cmd_ring); + /* Turn all aborted commands in list to no-ops, then restart */ + list_for_each_entry(i_cmd, &xhci->cmd_list, cmd_list) { - /* Section 4.6.1.2 of xHCI 1.0 spec says software should - * time the completion od all xHCI commands, including - * the Command Abort operation. If software doesn't see - * CRR negated in a timely manner (e.g. longer than 5 - * seconds), then it should assume that the there are - * larger problems with the xHC and assert HCRST. - */ - ret = xhci_handshake(xhci, &xhci->op_regs->cmd_ring, - CMD_RING_RUNNING, 0, 5 * 1000 * 1000); - if (ret < 0) { - xhci_err(xhci, "Stopped the command ring failed, " - "maybe the host is dead\n"); - xhci->xhc_state |= XHCI_STATE_DYING; - xhci_quiesce(xhci); - xhci_halt(xhci); - return -ESHUTDOWN; - } + if (i_cmd->status != COMP_COMMAND_ABORTED) + continue; - return 0; -} + i_cmd->status = COMP_COMMAND_RING_STOPPED; -static int xhci_queue_cd(struct xhci_hcd *xhci, - struct xhci_command *command, - union xhci_trb *cmd_trb) -{ - struct xhci_cd *cd; - cd = kzalloc(sizeof(struct xhci_cd), GFP_ATOMIC); - if (!cd) - return -ENOMEM; - INIT_LIST_HEAD(&cd->cancel_cmd_list); + xhci_dbg(xhci, "Turn aborted command %p to no-op\n", + i_cmd->command_trb); - cd->command = command; - cd->cmd_trb = cmd_trb; - list_add_tail(&cd->cancel_cmd_list, &xhci->cancel_cmd_list); + trb_to_noop(i_cmd->command_trb, TRB_CMD_NOOP, false); - return 0; + /* + * caller waiting for completion is called when command + * completion event is received for these no-op commands + */ + } + + xhci->cmd_ring_state = CMD_RING_STATE_RUNNING; + + /* ring command ring doorbell to restart the command ring */ + if ((xhci->cmd_ring->dequeue != xhci->cmd_ring->enqueue) && + !(xhci->xhc_state & XHCI_STATE_DYING)) { + xhci->current_cmd = cur_cmd; + if (cur_cmd) + xhci_mod_cmd_timer(xhci); + xhci_ring_cmd_db(xhci); + } } -/* - * Cancel the command which has issue. - * - * Some commands may hang due to waiting for acknowledgement from - * usb device. It is outside of the xHC's ability to control and - * will cause the command ring is blocked. When it occurs software - * should intervene to recover the command ring. - * See Section 4.6.1.1 and 4.6.1.2 - */ -int xhci_cancel_cmd(struct xhci_hcd *xhci, struct xhci_command *command, - union xhci_trb *cmd_trb) +/* Must be called with xhci->lock held, releases and acquires lock back */ +static int xhci_abort_cmd_ring(struct xhci_hcd *xhci, unsigned long flags) { - int retval = 0; - unsigned long flags; + struct xhci_segment *new_seg = xhci->cmd_ring->deq_seg; + union xhci_trb *new_deq = xhci->cmd_ring->dequeue; + u64 crcr; + int ret; - spin_lock_irqsave(&xhci->lock, flags); + xhci_dbg(xhci, "Abort command ring\n"); - if (xhci->xhc_state & XHCI_STATE_DYING) { - xhci_warn(xhci, "Abort the command ring," - " but the xHCI is dead.\n"); - retval = -ESHUTDOWN; - goto fail; - } - - /* queue the cmd desriptor to cancel_cmd_list */ - retval = xhci_queue_cd(xhci, command, cmd_trb); - if (retval) { - xhci_warn(xhci, "Queuing command descriptor failed.\n"); - goto fail; - } - - /* abort command ring */ - retval = xhci_abort_cmd_ring(xhci); - if (retval) { - xhci_err(xhci, "Abort command ring failed\n"); - if (unlikely(retval == -ESHUTDOWN)) { - spin_unlock_irqrestore(&xhci->lock, flags); - usb_hc_died(xhci_to_hcd(xhci)->primary_hcd); - xhci_dbg(xhci, "xHCI host controller is dead.\n"); - return retval; - } - } + reinit_completion(&xhci->cmd_ring_stop_completion); -fail: + /* + * The control bits like command stop, abort are located in lower + * dword of the command ring control register. + * Some controllers require all 64 bits to be written to abort the ring. + * Make sure the upper dword is valid, pointing to the next command, + * avoiding corrupting the command ring pointer in case the command ring + * is stopped by the time the upper dword is written. + */ + next_trb(&new_seg, &new_deq); + if (trb_is_link(new_deq)) + next_trb(&new_seg, &new_deq); + + crcr = xhci_trb_virt_to_dma(new_seg, new_deq); + xhci_write_64(xhci, crcr | CMD_RING_ABORT, &xhci->op_regs->cmd_ring); + + /* Section 4.6.1.2 of xHCI 1.0 spec says software should also time the + * completion of the Command Abort operation. If CRR is not negated in 5 + * seconds then driver handles it as if host died (-ENODEV). + * In the future we should distinguish between -ENODEV and -ETIMEDOUT + * and try to recover a -ETIMEDOUT with a host controller reset. + */ + ret = xhci_handshake(&xhci->op_regs->cmd_ring, + CMD_RING_RUNNING, 0, 5 * 1000 * 1000); + if (ret < 0) { + xhci_err(xhci, "Abort failed to stop command ring: %d\n", ret); + xhci_halt(xhci); + xhci_hc_died(xhci); + return ret; + } + /* + * Writing the CMD_RING_ABORT bit should cause a cmd completion event, + * however on some host hw the CMD_RING_RUNNING bit is correctly cleared + * but the completion event in never sent. Wait 2 secs (arbitrary + * number) to handle those cases after negation of CMD_RING_RUNNING. + */ spin_unlock_irqrestore(&xhci->lock, flags); - return retval; + ret = wait_for_completion_timeout(&xhci->cmd_ring_stop_completion, + msecs_to_jiffies(2000)); + spin_lock_irqsave(&xhci->lock, flags); + if (!ret) { + xhci_dbg(xhci, "No stop event for abort, ring start fail?\n"); + xhci_cleanup_command_queue(xhci); + } else { + xhci_handle_stopped_cmd_ring(xhci, xhci_next_queued_cmd(xhci)); + } + return 0; } void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, @@ -411,15 +560,16 @@ void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, * We don't want to restart any stream rings if there's a set dequeue * pointer command pending because the device can choose to start any * stream once the endpoint is on the HW schedule. - * FIXME - check all the stream rings for pending cancellations. */ - if ((ep_state & EP_HALT_PENDING) || (ep_state & SET_DEQ_PENDING) || - (ep_state & EP_HALTED)) + if ((ep_state & EP_STOP_CMD_PENDING) || (ep_state & SET_DEQ_PENDING) || + (ep_state & EP_HALTED) || (ep_state & EP_CLEARING_TT)) return; - xhci_writel(xhci, DB_VALUE(ep_index, stream_id), db_addr); - /* The CPU has better things to do at this point than wait for a - * write-posting flush. It'll get there soon enough. - */ + + trace_xhci_ring_ep_doorbell(slot_id, DB_VALUE(ep_index, stream_id)); + + writel(DB_VALUE(ep_index, stream_id), db_addr); + /* flush the write */ + readl(db_addr); } /* Ring the doorbell for any rings with pending URBs */ @@ -434,7 +584,7 @@ static void ring_doorbell_for_active_rings(struct xhci_hcd *xhci, /* A ring has pending URBs if its TD list is not empty */ if (!(ep->ep_state & EP_HAS_STREAMS)) { - if (!(list_empty(&ep->ring->td_list))) + if (ep->ring && !(list_empty(&ep->ring->td_list))) xhci_ring_ep_doorbell(xhci, slot_id, ep_index, 0); return; } @@ -448,290 +598,576 @@ static void ring_doorbell_for_active_rings(struct xhci_hcd *xhci, } } -/* - * Find the segment that trb is in. Start searching in start_seg. - * If we must move past a segment that has a link TRB with a toggle cycle state - * bit set, then we will toggle the value pointed at by cycle_state. - */ -static struct xhci_segment *find_trb_seg( - struct xhci_segment *start_seg, - union xhci_trb *trb, int *cycle_state) +void xhci_ring_doorbell_for_active_rings(struct xhci_hcd *xhci, + unsigned int slot_id, + unsigned int ep_index) { - struct xhci_segment *cur_seg = start_seg; - struct xhci_generic_trb *generic_trb; + ring_doorbell_for_active_rings(xhci, slot_id, ep_index); +} - while (cur_seg->trbs > trb || - &cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) { - generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic; - if (generic_trb->field[3] & cpu_to_le32(LINK_TOGGLE)) - *cycle_state ^= 0x1; - cur_seg = cur_seg->next; - if (cur_seg == start_seg) - /* Looped over the entire list. Oops! */ - return NULL; +static struct xhci_virt_ep *xhci_get_virt_ep(struct xhci_hcd *xhci, + unsigned int slot_id, + unsigned int ep_index) +{ + if (slot_id == 0 || slot_id >= MAX_HC_SLOTS) { + xhci_warn(xhci, "Invalid slot_id %u\n", slot_id); + return NULL; + } + if (ep_index >= EP_CTX_PER_DEV) { + xhci_warn(xhci, "Invalid endpoint index %u\n", ep_index); + return NULL; + } + if (!xhci->devs[slot_id]) { + xhci_warn(xhci, "No xhci virt device for slot_id %u\n", slot_id); + return NULL; } - return cur_seg; -} + return &xhci->devs[slot_id]->eps[ep_index]; +} -static struct xhci_ring *xhci_triad_to_transfer_ring(struct xhci_hcd *xhci, - unsigned int slot_id, unsigned int ep_index, - unsigned int stream_id) +static struct xhci_ring *xhci_virt_ep_to_ring(struct xhci_hcd *xhci, + struct xhci_virt_ep *ep, + unsigned int stream_id) { - struct xhci_virt_ep *ep; - - ep = &xhci->devs[slot_id]->eps[ep_index]; - /* Common case: no streams */ + /* common case, no streams */ if (!(ep->ep_state & EP_HAS_STREAMS)) return ep->ring; - if (stream_id == 0) { - xhci_warn(xhci, - "WARN: Slot ID %u, ep index %u has streams, " - "but URB has no stream ID.\n", - slot_id, ep_index); + if (!ep->stream_info) return NULL; - } - if (stream_id < ep->stream_info->num_streams) - return ep->stream_info->stream_rings[stream_id]; + if (stream_id == 0 || stream_id >= ep->stream_info->num_streams) { + xhci_warn(xhci, "Invalid stream_id %u request for slot_id %u ep_index %u\n", + stream_id, ep->vdev->slot_id, ep->ep_index); + return NULL; + } - xhci_warn(xhci, - "WARN: Slot ID %u, ep index %u has " - "stream IDs 1 to %u allocated, " - "but stream ID %u is requested.\n", - slot_id, ep_index, - ep->stream_info->num_streams - 1, - stream_id); - return NULL; + return ep->stream_info->stream_rings[stream_id]; } -/* Get the right ring for the given URB. +/* Get the right ring for the given slot_id, ep_index and stream_id. * If the endpoint supports streams, boundary check the URB's stream ID. * If the endpoint doesn't support streams, return the singular endpoint ring. */ -static struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci, - struct urb *urb) +struct xhci_ring *xhci_triad_to_transfer_ring(struct xhci_hcd *xhci, + unsigned int slot_id, unsigned int ep_index, + unsigned int stream_id) { - return xhci_triad_to_transfer_ring(xhci, urb->dev->slot_id, - xhci_get_endpoint_index(&urb->ep->desc), urb->stream_id); + struct xhci_virt_ep *ep; + + ep = xhci_get_virt_ep(xhci, slot_id, ep_index); + if (!ep) + return NULL; + + return xhci_virt_ep_to_ring(xhci, ep, stream_id); } + /* - * Move the xHC's endpoint ring dequeue pointer past cur_td. - * Record the new state of the xHC's endpoint ring dequeue segment, - * dequeue pointer, and new consumer cycle state in state. - * Update our internal representation of the ring's dequeue pointer. - * - * We do this in three jumps: - * - First we update our new ring state to be the same as when the xHC stopped. - * - Then we traverse the ring to find the segment that contains - * the last TRB in the TD. We toggle the xHC's new cycle state when we pass - * any link TRBs with the toggle cycle bit set. - * - Finally we move the dequeue state one TRB further, toggling the cycle bit - * if we've moved it past a link TRB with the toggle cycle bit set. - * - * Some of the uses of xhci_generic_trb are grotty, but if they're done - * with correct __le32 accesses they should work fine. Only users of this are - * in here. + * Get the hw dequeue pointer xHC stopped on, either directly from the + * endpoint context, or if streams are in use from the stream context. + * The returned hw_dequeue contains the lowest four bits with cycle state + * and possbile stream context type. */ -void xhci_find_new_dequeue_state(struct xhci_hcd *xhci, - unsigned int slot_id, unsigned int ep_index, - unsigned int stream_id, struct xhci_td *cur_td, - struct xhci_dequeue_state *state) +static u64 xhci_get_hw_deq(struct xhci_hcd *xhci, struct xhci_virt_device *vdev, + unsigned int ep_index, unsigned int stream_id) +{ + struct xhci_ep_ctx *ep_ctx; + struct xhci_stream_ctx *st_ctx; + struct xhci_virt_ep *ep; + + ep = &vdev->eps[ep_index]; + + if (ep->ep_state & EP_HAS_STREAMS) { + st_ctx = &ep->stream_info->stream_ctx_array[stream_id]; + return le64_to_cpu(st_ctx->stream_ring); + } + ep_ctx = xhci_get_ep_ctx(xhci, vdev->out_ctx, ep_index); + return le64_to_cpu(ep_ctx->deq); +} + +static int xhci_move_dequeue_past_td(struct xhci_hcd *xhci, + unsigned int slot_id, unsigned int ep_index, + unsigned int stream_id, struct xhci_td *td) { struct xhci_virt_device *dev = xhci->devs[slot_id]; + struct xhci_virt_ep *ep = &dev->eps[ep_index]; struct xhci_ring *ep_ring; - struct xhci_generic_trb *trb; - struct xhci_ep_ctx *ep_ctx; + struct xhci_command *cmd; + struct xhci_segment *new_seg; + union xhci_trb *new_deq; + int new_cycle; dma_addr_t addr; + u64 hw_dequeue; + bool hw_dequeue_found = false; + bool td_last_trb_found = false; + u32 trb_sct = 0; + int ret; ep_ring = xhci_triad_to_transfer_ring(xhci, slot_id, ep_index, stream_id); if (!ep_ring) { - xhci_warn(xhci, "WARN can't find new dequeue state " - "for invalid stream ID %u.\n", - stream_id); - return; + xhci_warn(xhci, "WARN can't find new dequeue, invalid stream ID %u\n", + stream_id); + return -ENODEV; } - state->new_cycle_state = 0; - xhci_dbg(xhci, "Finding segment containing stopped TRB.\n"); - state->new_deq_seg = find_trb_seg(cur_td->start_seg, - dev->eps[ep_index].stopped_trb, - &state->new_cycle_state); - if (!state->new_deq_seg) { - WARN_ON(1); - return; + + hw_dequeue = xhci_get_hw_deq(xhci, dev, ep_index, stream_id) & TR_DEQ_PTR_MASK; + new_seg = ep_ring->deq_seg; + new_deq = ep_ring->dequeue; + new_cycle = le32_to_cpu(td->end_trb->generic.field[3]) & TRB_CYCLE; + + /* + * Walk the ring until both the next TRB and hw_dequeue are found (don't + * move hw_dequeue back if it went forward due to a HW bug). Cycle state + * is loaded from a known good TRB, track later toggles to maintain it. + */ + do { + if (!hw_dequeue_found && xhci_trb_virt_to_dma(new_seg, new_deq) + == (dma_addr_t)hw_dequeue) { + hw_dequeue_found = true; + if (td_last_trb_found) + break; + } + if (new_deq == td->end_trb) + td_last_trb_found = true; + + if (td_last_trb_found && trb_is_link(new_deq) && + link_trb_toggles_cycle(new_deq)) + new_cycle ^= 0x1; + + next_trb(&new_seg, &new_deq); + + /* Search wrapped around, bail out */ + if (new_deq == ep->ring->dequeue) { + xhci_err(xhci, "Error: Failed finding new dequeue state\n"); + return -EINVAL; + } + + } while (!hw_dequeue_found || !td_last_trb_found); + + /* Don't update the ring cycle state for the producer (us). */ + addr = xhci_trb_virt_to_dma(new_seg, new_deq); + if (addr == 0) { + xhci_warn(xhci, "Can't find dma of new dequeue ptr\n"); + xhci_warn(xhci, "deq seg = %p, deq ptr = %p\n", new_seg, new_deq); + return -EINVAL; } - /* Dig out the cycle state saved by the xHC during the stop ep cmd */ - xhci_dbg(xhci, "Finding endpoint context\n"); - ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index); - state->new_cycle_state = 0x1 & le64_to_cpu(ep_ctx->deq); + if ((ep->ep_state & SET_DEQ_PENDING)) { + xhci_warn(xhci, "Set TR Deq already pending, don't submit for 0x%pad\n", + &addr); + return -EBUSY; + } - state->new_deq_ptr = cur_td->last_trb; - xhci_dbg(xhci, "Finding segment containing last TRB in TD.\n"); - state->new_deq_seg = find_trb_seg(state->new_deq_seg, - state->new_deq_ptr, - &state->new_cycle_state); - if (!state->new_deq_seg) { - WARN_ON(1); - return; + /* This function gets called from contexts where it cannot sleep */ + cmd = xhci_alloc_command(xhci, false, GFP_ATOMIC); + if (!cmd) { + xhci_warn(xhci, "Can't alloc Set TR Deq cmd 0x%pad\n", &addr); + return -ENOMEM; } - trb = &state->new_deq_ptr->generic; - if (TRB_TYPE_LINK_LE32(trb->field[3]) && - (trb->field[3] & cpu_to_le32(LINK_TOGGLE))) - state->new_cycle_state ^= 0x1; - next_trb(xhci, ep_ring, &state->new_deq_seg, &state->new_deq_ptr); + if (stream_id) + trb_sct = SCT_FOR_TRB(SCT_PRI_TR); + ret = queue_command(xhci, cmd, + lower_32_bits(addr) | trb_sct | new_cycle, + upper_32_bits(addr), + STREAM_ID_FOR_TRB(stream_id), SLOT_ID_FOR_TRB(slot_id) | + EP_INDEX_FOR_TRB(ep_index) | TRB_TYPE(TRB_SET_DEQ), false); + if (ret < 0) { + xhci_free_command(xhci, cmd); + return ret; + } + ep->queued_deq_seg = new_seg; + ep->queued_deq_ptr = new_deq; - /* - * If there is only one segment in a ring, find_trb_seg()'s while loop - * will not run, and it will return before it has a chance to see if it - * needs to toggle the cycle bit. It can't tell if the stalled transfer - * ended just before the link TRB on a one-segment ring, or if the TD - * wrapped around the top of the ring, because it doesn't have the TD in - * question. Look for the one-segment case where stalled TRB's address - * is greater than the new dequeue pointer address. - */ - if (ep_ring->first_seg == ep_ring->first_seg->next && - state->new_deq_ptr < dev->eps[ep_index].stopped_trb) - state->new_cycle_state ^= 0x1; - xhci_dbg(xhci, "Cycle state = 0x%x\n", state->new_cycle_state); + xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, + "Set TR Deq ptr 0x%llx, cycle %u\n", addr, new_cycle); - /* Don't update the ring cycle state for the producer (us). */ - xhci_dbg(xhci, "New dequeue segment = %p (virtual)\n", - state->new_deq_seg); - addr = xhci_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr); - xhci_dbg(xhci, "New dequeue pointer = 0x%llx (DMA)\n", - (unsigned long long) addr); + /* Stop the TD queueing code from ringing the doorbell until + * this command completes. The HC won't set the dequeue pointer + * if the ring is running, and ringing the doorbell starts the + * ring running. + */ + ep->ep_state |= SET_DEQ_PENDING; + xhci_ring_cmd_db(xhci); + return 0; } /* flip_cycle means flip the cycle bit of all but the first and last TRB. * (The last TRB actually points to the ring enqueue pointer, which is not part * of this TD.) This is used to remove partially enqueued isoc TDs from a ring. */ -static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, - struct xhci_td *cur_td, bool flip_cycle) -{ - struct xhci_segment *cur_seg; - union xhci_trb *cur_trb; - - for (cur_seg = cur_td->start_seg, cur_trb = cur_td->first_trb; - true; - next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { - if (TRB_TYPE_LINK_LE32(cur_trb->generic.field[3])) { - /* Unchain any chained Link TRBs, but - * leave the pointers intact. - */ - cur_trb->generic.field[3] &= cpu_to_le32(~TRB_CHAIN); - /* Flip the cycle bit (link TRBs can't be the first - * or last TRB). - */ - if (flip_cycle) - cur_trb->generic.field[3] ^= - cpu_to_le32(TRB_CYCLE); - xhci_dbg(xhci, "Cancel (unchain) link TRB\n"); - xhci_dbg(xhci, "Address = %p (0x%llx dma); " - "in seg %p (0x%llx dma)\n", - cur_trb, - (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb), - cur_seg, - (unsigned long long)cur_seg->dma); - } else { - cur_trb->generic.field[0] = 0; - cur_trb->generic.field[1] = 0; - cur_trb->generic.field[2] = 0; - /* Preserve only the cycle bit of this TRB */ - cur_trb->generic.field[3] &= cpu_to_le32(TRB_CYCLE); - /* Flip the cycle bit except on the first or last TRB */ - if (flip_cycle && cur_trb != cur_td->first_trb && - cur_trb != cur_td->last_trb) - cur_trb->generic.field[3] ^= - cpu_to_le32(TRB_CYCLE); - cur_trb->generic.field[3] |= cpu_to_le32( - TRB_TYPE(TRB_TR_NOOP)); - xhci_dbg(xhci, "TRB to noop at offset 0x%llx\n", - (unsigned long long) - xhci_trb_virt_to_dma(cur_seg, cur_trb)); - } - if (cur_trb == cur_td->last_trb) +static void td_to_noop(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, + struct xhci_td *td, bool flip_cycle) +{ + bool unchain_links; + struct xhci_segment *seg = td->start_seg; + union xhci_trb *trb = td->start_trb; + + /* link TRBs should now be unchained, but some old HCs expect otherwise */ + unchain_links = !xhci_link_chain_quirk(xhci, ep->ring ? ep->ring->type : TYPE_STREAM); + + while (1) { + trb_to_noop(trb, TRB_TR_NOOP, unchain_links); + + /* flip cycle if asked to */ + if (flip_cycle && trb != td->start_trb && trb != td->end_trb) + trb->generic.field[3] ^= cpu_to_le32(TRB_CYCLE); + + if (trb == td->end_trb) break; + + next_trb(&seg, &trb); } } -static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id, - unsigned int ep_index, unsigned int stream_id, - struct xhci_segment *deq_seg, - union xhci_trb *deq_ptr, u32 cycle_state); +static void xhci_giveback_urb_in_irq(struct xhci_hcd *xhci, + struct xhci_td *cur_td, int status) +{ + struct urb *urb = cur_td->urb; + struct urb_priv *urb_priv = urb->hcpriv; + struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus); + + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--; + if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs == 0) { + if (xhci->quirks & XHCI_AMD_PLL_FIX) + usb_amd_quirk_pll_enable(); + } + } + xhci_urb_free_priv(urb_priv); + usb_hcd_unlink_urb_from_ep(hcd, urb); + trace_xhci_urb_giveback(urb); + usb_hcd_giveback_urb(hcd, urb, status); +} -void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci, - unsigned int slot_id, unsigned int ep_index, - unsigned int stream_id, - struct xhci_dequeue_state *deq_state) +static void xhci_unmap_td_bounce_buffer(struct xhci_hcd *xhci, + struct xhci_ring *ring, struct xhci_td *td) { - struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index]; + struct device *dev = xhci_to_hcd(xhci)->self.sysdev; + struct xhci_segment *seg = td->bounce_seg; + struct urb *urb = td->urb; + size_t len; - xhci_dbg(xhci, "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), " - "new deq ptr = %p (0x%llx dma), new cycle = %u\n", - deq_state->new_deq_seg, - (unsigned long long)deq_state->new_deq_seg->dma, - deq_state->new_deq_ptr, - (unsigned long long)xhci_trb_virt_to_dma(deq_state->new_deq_seg, deq_state->new_deq_ptr), - deq_state->new_cycle_state); - queue_set_tr_deq(xhci, slot_id, ep_index, stream_id, - deq_state->new_deq_seg, - deq_state->new_deq_ptr, - (u32) deq_state->new_cycle_state); - /* Stop the TD queueing code from ringing the doorbell until - * this command completes. The HC won't set the dequeue pointer - * if the ring is running, and ringing the doorbell starts the - * ring running. + if (!ring || !seg || !urb) + return; + + if (usb_urb_dir_out(urb)) { + dma_unmap_single(dev, seg->bounce_dma, ring->bounce_buf_len, + DMA_TO_DEVICE); + return; + } + + dma_unmap_single(dev, seg->bounce_dma, ring->bounce_buf_len, + DMA_FROM_DEVICE); + /* for in transfers we need to copy the data from bounce to sg */ + if (urb->num_sgs) { + len = sg_pcopy_from_buffer(urb->sg, urb->num_sgs, seg->bounce_buf, + seg->bounce_len, seg->bounce_offs); + if (len != seg->bounce_len) + xhci_warn(xhci, "WARN Wrong bounce buffer read length: %zu != %d\n", + len, seg->bounce_len); + } else { + memcpy(urb->transfer_buffer + seg->bounce_offs, seg->bounce_buf, + seg->bounce_len); + } + seg->bounce_len = 0; + seg->bounce_offs = 0; +} + +static void xhci_td_cleanup(struct xhci_hcd *xhci, struct xhci_td *td, + struct xhci_ring *ep_ring, int status) +{ + struct urb *urb = NULL; + + /* Clean up the endpoint's TD list */ + urb = td->urb; + + /* if a bounce buffer was used to align this td then unmap it */ + xhci_unmap_td_bounce_buffer(xhci, ep_ring, td); + + /* Do one last check of the actual transfer length. + * If the host controller said we transferred more data than the buffer + * length, urb->actual_length will be a very big number (since it's + * unsigned). Play it safe and say we didn't transfer anything. */ - ep->ep_state |= SET_DEQ_PENDING; + if (urb->actual_length > urb->transfer_buffer_length) { + xhci_warn(xhci, "URB req %u and actual %u transfer length mismatch\n", + urb->transfer_buffer_length, urb->actual_length); + urb->actual_length = 0; + status = 0; + } + /* TD might be removed from td_list if we are giving back a cancelled URB */ + if (!list_empty(&td->td_list)) + list_del_init(&td->td_list); + /* Giving back a cancelled URB, or if a slated TD completed anyway */ + if (!list_empty(&td->cancelled_td_list)) + list_del_init(&td->cancelled_td_list); + + inc_td_cnt(urb); + /* Giveback the urb when all the tds are completed */ + if (last_td_in_urb(td)) { + if ((urb->actual_length != urb->transfer_buffer_length && + (urb->transfer_flags & URB_SHORT_NOT_OK)) || + (status != 0 && !usb_endpoint_xfer_isoc(&urb->ep->desc))) + xhci_dbg(xhci, "Giveback URB %p, len = %d, expected = %d, status = %d\n", + urb, urb->actual_length, + urb->transfer_buffer_length, status); + + /* set isoc urb status to 0 just as EHCI, UHCI, and OHCI */ + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) + status = 0; + xhci_giveback_urb_in_irq(xhci, td, status); + } } -static void xhci_stop_watchdog_timer_in_irq(struct xhci_hcd *xhci, - struct xhci_virt_ep *ep) +/* Give back previous TD and move on to the next TD. */ +static void xhci_dequeue_td(struct xhci_hcd *xhci, struct xhci_td *td, struct xhci_ring *ring, + u32 status) +{ + ring->dequeue = td->end_trb; + ring->deq_seg = td->end_seg; + inc_deq(xhci, ring); + + xhci_td_cleanup(xhci, td, ring, status); +} + +/* Complete the cancelled URBs we unlinked from td_list. */ +static void xhci_giveback_invalidated_tds(struct xhci_virt_ep *ep) +{ + struct xhci_ring *ring; + struct xhci_td *td, *tmp_td; + + list_for_each_entry_safe(td, tmp_td, &ep->cancelled_td_list, + cancelled_td_list) { + + ring = xhci_urb_to_transfer_ring(ep->xhci, td->urb); + + if (td->cancel_status == TD_CLEARED) { + xhci_dbg(ep->xhci, "%s: Giveback cancelled URB %p TD\n", + __func__, td->urb); + xhci_td_cleanup(ep->xhci, td, ring, td->status); + } else { + xhci_dbg(ep->xhci, "%s: Keep cancelled URB %p TD as cancel_status is %d\n", + __func__, td->urb, td->cancel_status); + } + if (ep->xhci->xhc_state & XHCI_STATE_DYING) + return; + } +} + +static int xhci_reset_halted_ep(struct xhci_hcd *xhci, unsigned int slot_id, + unsigned int ep_index, enum xhci_ep_reset_type reset_type) { - ep->ep_state &= ~EP_HALT_PENDING; - /* Can't del_timer_sync in interrupt, so we attempt to cancel. If the - * timer is running on another CPU, we don't decrement stop_cmds_pending - * (since we didn't successfully stop the watchdog timer). + struct xhci_command *command; + int ret = 0; + + command = xhci_alloc_command(xhci, false, GFP_ATOMIC); + if (!command) { + ret = -ENOMEM; + goto done; + } + + xhci_dbg(xhci, "%s-reset ep %u, slot %u\n", + (reset_type == EP_HARD_RESET) ? "Hard" : "Soft", + ep_index, slot_id); + + ret = xhci_queue_reset_ep(xhci, command, slot_id, ep_index, reset_type); +done: + if (ret) + xhci_err(xhci, "ERROR queuing reset endpoint for slot %d ep_index %d, %d\n", + slot_id, ep_index, ret); + return ret; +} + +static int xhci_handle_halted_endpoint(struct xhci_hcd *xhci, + struct xhci_virt_ep *ep, + struct xhci_td *td, + enum xhci_ep_reset_type reset_type) +{ + unsigned int slot_id = ep->vdev->slot_id; + int err; + + /* + * Avoid resetting endpoint if link is inactive. Can cause host hang. + * Device will be reset soon to recover the link so don't do anything */ - if (del_timer(&ep->stop_cmd_timer)) - ep->stop_cmds_pending--; + if (ep->vdev->flags & VDEV_PORT_ERROR) + return -ENODEV; + + /* add td to cancelled list and let reset ep handler take care of it */ + if (reset_type == EP_HARD_RESET) { + ep->ep_state |= EP_HARD_CLEAR_TOGGLE; + if (td && list_empty(&td->cancelled_td_list)) { + list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list); + td->cancel_status = TD_HALTED; + } + } + + if (ep->ep_state & EP_HALTED) { + xhci_dbg(xhci, "Reset ep command for ep_index %d already pending\n", + ep->ep_index); + return 0; + } + + err = xhci_reset_halted_ep(xhci, slot_id, ep->ep_index, reset_type); + if (err) + return err; + + ep->ep_state |= EP_HALTED; + + xhci_ring_cmd_db(xhci); + + return 0; } -/* Must be called with xhci->lock held in interrupt context */ -static void xhci_giveback_urb_in_irq(struct xhci_hcd *xhci, - struct xhci_td *cur_td, int status, char *adjective) +/* + * Fix up the ep ring first, so HW stops executing cancelled TDs. + * We have the xHCI lock, so nothing can modify this list until we drop it. + * We're also in the event handler, so we can't get re-interrupted if another + * Stop Endpoint command completes. + * + * only call this when ring is not in a running state + */ + +static int xhci_invalidate_cancelled_tds(struct xhci_virt_ep *ep) { - struct usb_hcd *hcd; - struct urb *urb; - struct urb_priv *urb_priv; + struct xhci_hcd *xhci; + struct xhci_td *td = NULL; + struct xhci_td *tmp_td = NULL; + struct xhci_td *cached_td = NULL; + struct xhci_ring *ring; + u64 hw_deq; + unsigned int slot_id = ep->vdev->slot_id; + int err; - urb = cur_td->urb; - urb_priv = urb->hcpriv; - urb_priv->td_cnt++; - hcd = bus_to_hcd(urb->dev->bus); - - /* Only giveback urb when this is the last td in urb */ - if (urb_priv->td_cnt == urb_priv->length) { - if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { - xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--; - if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs == 0) { - if (xhci->quirks & XHCI_AMD_PLL_FIX) - usb_amd_quirk_pll_enable(); + /* + * This is not going to work if the hardware is changing its dequeue + * pointers as we look at them. Completion handler will call us later. + */ + if (ep->ep_state & SET_DEQ_PENDING) + return 0; + + xhci = ep->xhci; + + list_for_each_entry_safe(td, tmp_td, &ep->cancelled_td_list, cancelled_td_list) { + xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, + "Removing canceled TD starting at 0x%llx (dma) in stream %u URB %p", + (unsigned long long)xhci_trb_virt_to_dma( + td->start_seg, td->start_trb), + td->urb->stream_id, td->urb); + list_del_init(&td->td_list); + ring = xhci_urb_to_transfer_ring(xhci, td->urb); + if (!ring) { + xhci_warn(xhci, "WARN Cancelled URB %p has invalid stream ID %u.\n", + td->urb, td->urb->stream_id); + continue; + } + /* + * If a ring stopped on the TD we need to cancel then we have to + * move the xHC endpoint ring dequeue pointer past this TD. + * Rings halted due to STALL may show hw_deq is past the stalled + * TD, but still require a set TR Deq command to flush xHC cache. + */ + hw_deq = xhci_get_hw_deq(xhci, ep->vdev, ep->ep_index, + td->urb->stream_id); + hw_deq &= TR_DEQ_PTR_MASK; + + if (td->cancel_status == TD_HALTED || trb_in_td(td, hw_deq)) { + switch (td->cancel_status) { + case TD_CLEARED: /* TD is already no-op */ + case TD_CLEARING_CACHE: /* set TR deq command already queued */ + break; + case TD_DIRTY: /* TD is cached, clear it */ + case TD_HALTED: + case TD_CLEARING_CACHE_DEFERRED: + if (cached_td) { + if (cached_td->urb->stream_id != td->urb->stream_id) { + /* Multiple streams case, defer move dq */ + xhci_dbg(xhci, + "Move dq deferred: stream %u URB %p\n", + td->urb->stream_id, td->urb); + td->cancel_status = TD_CLEARING_CACHE_DEFERRED; + break; + } + + /* Should never happen, but clear the TD if it does */ + xhci_warn(xhci, + "Found multiple active URBs %p and %p in stream %u?\n", + td->urb, cached_td->urb, + td->urb->stream_id); + td_to_noop(xhci, ep, cached_td, false); + cached_td->cancel_status = TD_CLEARED; + } + td_to_noop(xhci, ep, td, false); + td->cancel_status = TD_CLEARING_CACHE; + cached_td = td; + break; } + } else { + td_to_noop(xhci, ep, td, false); + td->cancel_status = TD_CLEARED; } - usb_hcd_unlink_urb_from_ep(hcd, urb); + } + + /* If there's no need to move the dequeue pointer then we're done */ + if (!cached_td) + return 0; - spin_unlock(&xhci->lock); - usb_hcd_giveback_urb(hcd, urb, status); - xhci_urb_free_priv(xhci, urb_priv); - spin_lock(&xhci->lock); + err = xhci_move_dequeue_past_td(xhci, slot_id, ep->ep_index, + cached_td->urb->stream_id, + cached_td); + if (err) { + /* Failed to move past cached td, just set cached TDs to no-op */ + list_for_each_entry_safe(td, tmp_td, &ep->cancelled_td_list, cancelled_td_list) { + /* + * Deferred TDs need to have the deq pointer set after the above command + * completes, so if that failed we just give up on all of them (and + * complain loudly since this could cause issues due to caching). + */ + if (td->cancel_status != TD_CLEARING_CACHE && + td->cancel_status != TD_CLEARING_CACHE_DEFERRED) + continue; + xhci_warn(xhci, "Failed to clear cancelled cached URB %p, mark clear anyway\n", + td->urb); + td_to_noop(xhci, ep, td, false); + td->cancel_status = TD_CLEARED; + } } + return 0; +} + +/* + * Erase queued TDs from transfer ring(s) and give back those the xHC didn't + * stop on. If necessary, queue commands to move the xHC off cancelled TDs it + * stopped on. Those will be given back later when the commands complete. + * + * Call under xhci->lock on a stopped endpoint. + */ +void xhci_process_cancelled_tds(struct xhci_virt_ep *ep) +{ + xhci_invalidate_cancelled_tds(ep); + xhci_giveback_invalidated_tds(ep); +} + +/* + * Returns the TD the endpoint ring halted on. + * Only call for non-running rings without streams. + */ +static struct xhci_td *find_halted_td(struct xhci_virt_ep *ep) +{ + struct xhci_td *td; + u64 hw_deq; + + if (!list_empty(&ep->ring->td_list)) { /* Not streams compatible */ + hw_deq = xhci_get_hw_deq(ep->xhci, ep->vdev, ep->ep_index, 0); + hw_deq &= TR_DEQ_PTR_MASK; + td = list_first_entry(&ep->ring->td_list, struct xhci_td, td_list); + if (trb_in_td(td, hw_deq)) + return td; + } + return NULL; } /* @@ -744,299 +1180,230 @@ static void xhci_giveback_urb_in_irq(struct xhci_hcd *xhci, * 2. Otherwise, we turn all the TRBs in the TD into No-op TRBs (with the chain * bit cleared) so that the HW will skip over them. */ -static void handle_stopped_endpoint(struct xhci_hcd *xhci, - union xhci_trb *trb, struct xhci_event_cmd *event) +static void xhci_handle_cmd_stop_ep(struct xhci_hcd *xhci, int slot_id, + union xhci_trb *trb, u32 comp_code) { - unsigned int slot_id; unsigned int ep_index; - struct xhci_virt_device *virt_dev; - struct xhci_ring *ep_ring; struct xhci_virt_ep *ep; - struct list_head *entry; - struct xhci_td *cur_td = NULL; - struct xhci_td *last_unlinked_td; - - struct xhci_dequeue_state deq_state; + struct xhci_ep_ctx *ep_ctx; + struct xhci_td *td = NULL; + enum xhci_ep_reset_type reset_type; + struct xhci_command *command; + int err; - if (unlikely(TRB_TO_SUSPEND_PORT( - le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3])))) { - slot_id = TRB_TO_SLOT_ID( - le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3])); - virt_dev = xhci->devs[slot_id]; - if (virt_dev) - handle_cmd_in_cmd_wait_list(xhci, virt_dev, - event); - else - xhci_warn(xhci, "Stop endpoint command " - "completion for disabled slot %u\n", - slot_id); + if (unlikely(TRB_TO_SUSPEND_PORT(le32_to_cpu(trb->generic.field[3])))) { + if (!xhci->devs[slot_id]) + xhci_warn(xhci, "Stop endpoint command completion for disabled slot %u\n", + slot_id); return; } - memset(&deq_state, 0, sizeof(deq_state)); - slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3])); ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3])); - ep = &xhci->devs[slot_id]->eps[ep_index]; - - if (list_empty(&ep->cancelled_td_list)) { - xhci_stop_watchdog_timer_in_irq(xhci, ep); - ep->stopped_td = NULL; - ep->stopped_trb = NULL; - ring_doorbell_for_active_rings(xhci, slot_id, ep_index); + ep = xhci_get_virt_ep(xhci, slot_id, ep_index); + if (!ep) return; - } - /* Fix up the ep ring first, so HW stops executing cancelled TDs. - * We have the xHCI lock, so nothing can modify this list until we drop - * it. We're also in the event handler, so we can't get re-interrupted - * if another Stop Endpoint command completes - */ - list_for_each(entry, &ep->cancelled_td_list) { - cur_td = list_entry(entry, struct xhci_td, cancelled_td_list); - xhci_dbg(xhci, "Removing canceled TD starting at 0x%llx (dma).\n", - (unsigned long long)xhci_trb_virt_to_dma( - cur_td->start_seg, cur_td->first_trb)); - ep_ring = xhci_urb_to_transfer_ring(xhci, cur_td->urb); - if (!ep_ring) { - /* This shouldn't happen unless a driver is mucking - * with the stream ID after submission. This will - * leave the TD on the hardware ring, and the hardware - * will try to execute it, and may access a buffer - * that has already been freed. In the best case, the - * hardware will execute it, and the event handler will - * ignore the completion event for that TD, since it was - * removed from the td_list for that endpoint. In - * short, don't muck with the stream ID after - * submission. - */ - xhci_warn(xhci, "WARN Cancelled URB %p " - "has invalid stream ID %u.\n", - cur_td->urb, - cur_td->urb->stream_id); - goto remove_finished_td; - } - /* - * If we stopped on the TD we need to cancel, then we have to - * move the xHC endpoint ring dequeue pointer past this TD. - */ - if (cur_td == ep->stopped_td) - xhci_find_new_dequeue_state(xhci, slot_id, ep_index, - cur_td->urb->stream_id, - cur_td, &deq_state); - else - td_to_noop(xhci, ep_ring, cur_td, false); -remove_finished_td: - /* - * The event handler won't see a completion for this TD anymore, - * so remove it from the endpoint ring's TD list. Keep it in - * the cancelled TD list for URB completion later. - */ - list_del_init(&cur_td->td_list); - } - last_unlinked_td = cur_td; - xhci_stop_watchdog_timer_in_irq(xhci, ep); + ep_ctx = xhci_get_ep_ctx(xhci, ep->vdev->out_ctx, ep_index); - /* If necessary, queue a Set Transfer Ring Dequeue Pointer command */ - if (deq_state.new_deq_ptr && deq_state.new_deq_seg) { - xhci_queue_new_dequeue_state(xhci, - slot_id, ep_index, - ep->stopped_td->urb->stream_id, - &deq_state); - xhci_ring_cmd_db(xhci); - } else { - /* Otherwise ring the doorbell(s) to restart queued transfers */ - ring_doorbell_for_active_rings(xhci, slot_id, ep_index); - } - ep->stopped_td = NULL; - ep->stopped_trb = NULL; + trace_xhci_handle_cmd_stop_ep(ep_ctx); + if (comp_code == COMP_CONTEXT_STATE_ERROR) { /* - * Drop the lock and complete the URBs in the cancelled TD list. - * New TDs to be cancelled might be added to the end of the list before - * we can complete all the URBs for the TDs we already unlinked. - * So stop when we've completed the URB for the last TD we unlinked. + * If stop endpoint command raced with a halting endpoint we need to + * reset the host side endpoint first. + * If the TD we halted on isn't cancelled the TD should be given back + * with a proper error code, and the ring dequeue moved past the TD. + * If streams case we can't find hw_deq, or the TD we halted on so do a + * soft reset. + * + * Proper error code is unknown here, it would be -EPIPE if device side + * of enadpoit halted (aka STALL), and -EPROTO if not (transaction error) + * We use -EPROTO, if device is stalled it should return a stall error on + * next transfer, which then will return -EPIPE, and device side stall is + * noted and cleared by class driver. */ - do { - cur_td = list_entry(ep->cancelled_td_list.next, - struct xhci_td, cancelled_td_list); - list_del_init(&cur_td->cancelled_td_list); + switch (GET_EP_CTX_STATE(ep_ctx)) { + case EP_STATE_HALTED: + xhci_dbg(xhci, "Stop ep completion raced with stall\n"); + /* + * If the halt happened before Stop Endpoint failed, its transfer event + * should have already been handled and Reset Endpoint should be pending. + */ + if (ep->ep_state & EP_HALTED) + goto reset_done; - /* Clean up the cancelled URB */ - /* Doesn't matter what we pass for status, since the core will - * just overwrite it (because the URB has been unlinked). - */ - xhci_giveback_urb_in_irq(xhci, cur_td, 0, "cancelled"); + if (ep->ep_state & EP_HAS_STREAMS) { + reset_type = EP_SOFT_RESET; + } else { + reset_type = EP_HARD_RESET; + td = find_halted_td(ep); + if (td) + td->status = -EPROTO; + } + /* reset ep, reset handler cleans up cancelled tds */ + err = xhci_handle_halted_endpoint(xhci, ep, td, reset_type); + xhci_dbg(xhci, "Stop ep completion resetting ep, status %d\n", err); + if (err) + break; +reset_done: + /* Reset EP handler will clean up cancelled TDs */ + ep->ep_state &= ~EP_STOP_CMD_PENDING; + return; + case EP_STATE_STOPPED: + /* + * Per xHCI 4.6.9, Stop Endpoint command on a Stopped + * EP is a Context State Error, and EP stays Stopped. + * + * But maybe it failed on Halted, and somebody ran Reset + * Endpoint later. EP state is now Stopped and EP_HALTED + * still set because Reset EP handler will run after us. + */ + if (ep->ep_state & EP_HALTED) + break; + /* + * On some HCs EP state remains Stopped for some tens of + * us to a few ms or more after a doorbell ring, and any + * new Stop Endpoint fails without aborting the restart. + * This handler may run quickly enough to still see this + * Stopped state, but it will soon change to Running. + * + * Assume this bug on unexpected Stop Endpoint failures. + * Keep retrying until the EP starts and stops again or + * up to a timeout (a defective HC may never start, or a + * driver bug may cause stopping an already stopped EP). + */ + if (time_is_before_jiffies(ep->stop_time + msecs_to_jiffies(100))) + break; + fallthrough; + case EP_STATE_RUNNING: + /* Race, HW handled stop ep cmd before ep was running */ + xhci_dbg(xhci, "Stop ep completion ctx error, ctx_state %d\n", + GET_EP_CTX_STATE(ep_ctx)); + + command = xhci_alloc_command(xhci, false, GFP_ATOMIC); + if (!command) { + ep->ep_state &= ~EP_STOP_CMD_PENDING; + return; + } + xhci_queue_stop_endpoint(xhci, command, slot_id, ep_index, 0); + xhci_ring_cmd_db(xhci); - /* Stop processing the cancelled list if the watchdog timer is - * running. - */ - if (xhci->xhc_state & XHCI_STATE_DYING) return; - } while (cur_td != last_unlinked_td); + default: + break; + } + } + + /* will queue a set TR deq if stopped on a cancelled, uncleared TD */ + xhci_invalidate_cancelled_tds(ep); + ep->ep_state &= ~EP_STOP_CMD_PENDING; - /* Return to the event handler with xhci->lock re-acquired */ + /* Otherwise ring the doorbell(s) to restart queued transfers */ + xhci_giveback_invalidated_tds(ep); + ring_doorbell_for_active_rings(xhci, slot_id, ep_index); } -/* Watchdog timer function for when a stop endpoint command fails to complete. - * In this case, we assume the host controller is broken or dying or dead. The - * host may still be completing some other events, so we have to be careful to - * let the event ring handler and the URB dequeueing/enqueueing functions know - * through xhci->state. - * - * The timer may also fire if the host takes a very long time to respond to the - * command, and the stop endpoint command completion handler cannot delete the - * timer before the timer function is called. Another endpoint cancellation may - * sneak in before the timer function can grab the lock, and that may queue - * another stop endpoint command and add the timer back. So we cannot use a - * simple flag to say whether there is a pending stop endpoint command for a - * particular endpoint. - * - * Instead we use a combination of that flag and a counter for the number of - * pending stop endpoint commands. If the timer is the tail end of the last - * stop endpoint command, and the endpoint's command is still pending, we assume - * the host is dying. - */ -void xhci_stop_endpoint_command_watchdog(unsigned long arg) +static void xhci_kill_ring_urbs(struct xhci_hcd *xhci, struct xhci_ring *ring) { - struct xhci_hcd *xhci; - struct xhci_virt_ep *ep; - struct xhci_virt_ep *temp_ep; - struct xhci_ring *ring; struct xhci_td *cur_td; - int ret, i, j; - unsigned long flags; + struct xhci_td *tmp; - ep = (struct xhci_virt_ep *) arg; - xhci = ep->xhci; + list_for_each_entry_safe(cur_td, tmp, &ring->td_list, td_list) { + list_del_init(&cur_td->td_list); - spin_lock_irqsave(&xhci->lock, flags); + if (!list_empty(&cur_td->cancelled_td_list)) + list_del_init(&cur_td->cancelled_td_list); - ep->stop_cmds_pending--; - if (xhci->xhc_state & XHCI_STATE_DYING) { - xhci_dbg(xhci, "Stop EP timer ran, but another timer marked " - "xHCI as DYING, exiting.\n"); - spin_unlock_irqrestore(&xhci->lock, flags); - return; - } - if (!(ep->stop_cmds_pending == 0 && (ep->ep_state & EP_HALT_PENDING))) { - xhci_dbg(xhci, "Stop EP timer ran, but no command pending, " - "exiting.\n"); - spin_unlock_irqrestore(&xhci->lock, flags); - return; + xhci_unmap_td_bounce_buffer(xhci, ring, cur_td); + + inc_td_cnt(cur_td->urb); + if (last_td_in_urb(cur_td)) + xhci_giveback_urb_in_irq(xhci, cur_td, -ESHUTDOWN); } +} - xhci_warn(xhci, "xHCI host not responding to stop endpoint command.\n"); - xhci_warn(xhci, "Assuming host is dying, halting host.\n"); - /* Oops, HC is dead or dying or at least not responding to the stop - * endpoint command. - */ - xhci->xhc_state |= XHCI_STATE_DYING; - /* Disable interrupts from the host controller and start halting it */ - xhci_quiesce(xhci); - spin_unlock_irqrestore(&xhci->lock, flags); +static void xhci_kill_endpoint_urbs(struct xhci_hcd *xhci, + int slot_id, int ep_index) +{ + struct xhci_td *cur_td; + struct xhci_td *tmp; + struct xhci_virt_ep *ep; + struct xhci_ring *ring; - ret = xhci_halt(xhci); + ep = xhci_get_virt_ep(xhci, slot_id, ep_index); + if (!ep) + return; - spin_lock_irqsave(&xhci->lock, flags); - if (ret < 0) { - /* This is bad; the host is not responding to commands and it's - * not allowing itself to be halted. At least interrupts are - * disabled. If we call usb_hc_died(), it will attempt to - * disconnect all device drivers under this host. Those - * disconnect() methods will wait for all URBs to be unlinked, - * so we must complete them. - */ - xhci_warn(xhci, "Non-responsive xHCI host is not halting.\n"); - xhci_warn(xhci, "Completing active URBs anyway.\n"); - /* We could turn all TDs on the rings to no-ops. This won't - * help if the host has cached part of the ring, and is slow if - * we want to preserve the cycle bit. Skip it and hope the host - * doesn't touch the memory. - */ - } - for (i = 0; i < MAX_HC_SLOTS; i++) { - if (!xhci->devs[i]) - continue; - for (j = 0; j < 31; j++) { - temp_ep = &xhci->devs[i]->eps[j]; - ring = temp_ep->ring; + if ((ep->ep_state & EP_HAS_STREAMS) || + (ep->ep_state & EP_GETTING_NO_STREAMS)) { + int stream_id; + + for (stream_id = 1; stream_id < ep->stream_info->num_streams; + stream_id++) { + ring = ep->stream_info->stream_rings[stream_id]; if (!ring) continue; - xhci_dbg(xhci, "Killing URBs for slot ID %u, " - "ep index %u\n", i, j); - while (!list_empty(&ring->td_list)) { - cur_td = list_first_entry(&ring->td_list, - struct xhci_td, - td_list); - list_del_init(&cur_td->td_list); - if (!list_empty(&cur_td->cancelled_td_list)) - list_del_init(&cur_td->cancelled_td_list); - xhci_giveback_urb_in_irq(xhci, cur_td, - -ESHUTDOWN, "killed"); - } - while (!list_empty(&temp_ep->cancelled_td_list)) { - cur_td = list_first_entry( - &temp_ep->cancelled_td_list, - struct xhci_td, - cancelled_td_list); - list_del_init(&cur_td->cancelled_td_list); - xhci_giveback_urb_in_irq(xhci, cur_td, - -ESHUTDOWN, "killed"); - } + + xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, + "Killing URBs for slot ID %u, ep index %u, stream %u", + slot_id, ep_index, stream_id); + xhci_kill_ring_urbs(xhci, ring); } + } else { + ring = ep->ring; + if (!ring) + return; + xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, + "Killing URBs for slot ID %u, ep index %u", + slot_id, ep_index); + xhci_kill_ring_urbs(xhci, ring); } - spin_unlock_irqrestore(&xhci->lock, flags); - xhci_dbg(xhci, "Calling usb_hc_died()\n"); - usb_hc_died(xhci_to_hcd(xhci)->primary_hcd); - xhci_dbg(xhci, "xHCI host controller is dead.\n"); -} + list_for_each_entry_safe(cur_td, tmp, &ep->cancelled_td_list, + cancelled_td_list) { + list_del_init(&cur_td->cancelled_td_list); + inc_td_cnt(cur_td->urb); -static void update_ring_for_set_deq_completion(struct xhci_hcd *xhci, - struct xhci_virt_device *dev, - struct xhci_ring *ep_ring, - unsigned int ep_index) + if (last_td_in_urb(cur_td)) + xhci_giveback_urb_in_irq(xhci, cur_td, -ESHUTDOWN); + } +} + +/* + * host controller died, register read returns 0xffffffff + * Complete pending commands, mark them ABORTED. + * URBs need to be given back as usb core might be waiting with device locks + * held for the URBs to finish during device disconnect, blocking host remove. + * + * Call with xhci->lock held. + * lock is relased and re-acquired while giving back urb. + */ +void xhci_hc_died(struct xhci_hcd *xhci) { - union xhci_trb *dequeue_temp; - int num_trbs_free_temp; - bool revert = false; + bool notify; + int i, j; - num_trbs_free_temp = ep_ring->num_trbs_free; - dequeue_temp = ep_ring->dequeue; + if (xhci->xhc_state & XHCI_STATE_DYING) + return; - /* If we get two back-to-back stalls, and the first stalled transfer - * ends just before a link TRB, the dequeue pointer will be left on - * the link TRB by the code in the while loop. So we have to update - * the dequeue pointer one segment further, or we'll jump off - * the segment into la-la-land. - */ - if (last_trb(xhci, ep_ring, ep_ring->deq_seg, ep_ring->dequeue)) { - ep_ring->deq_seg = ep_ring->deq_seg->next; - ep_ring->dequeue = ep_ring->deq_seg->trbs; - } - - while (ep_ring->dequeue != dev->eps[ep_index].queued_deq_ptr) { - /* We have more usable TRBs */ - ep_ring->num_trbs_free++; - ep_ring->dequeue++; - if (last_trb(xhci, ep_ring, ep_ring->deq_seg, - ep_ring->dequeue)) { - if (ep_ring->dequeue == - dev->eps[ep_index].queued_deq_ptr) - break; - ep_ring->deq_seg = ep_ring->deq_seg->next; - ep_ring->dequeue = ep_ring->deq_seg->trbs; - } - if (ep_ring->dequeue == dequeue_temp) { - revert = true; - break; - } - } + notify = !(xhci->xhc_state & XHCI_STATE_REMOVING); + if (notify) + xhci_err(xhci, "xHCI host controller not responding, assume dead\n"); + xhci->xhc_state |= XHCI_STATE_DYING; + + xhci_cleanup_command_queue(xhci); - if (revert) { - xhci_dbg(xhci, "Unable to find new dequeue pointer\n"); - ep_ring->num_trbs_free = num_trbs_free_temp; + /* return any pending urbs, remove may be waiting for them */ + for (i = 0; i <= xhci->max_slots; i++) { + if (!xhci->devs[i]) + continue; + for (j = 0; j < 31; j++) + xhci_kill_endpoint_urbs(xhci, i, j); } + + /* inform usb core hc died if PCI remove isn't already handling it */ + if (notify) + usb_hc_died(xhci_to_hcd(xhci)); } /* @@ -1046,63 +1413,66 @@ static void update_ring_for_set_deq_completion(struct xhci_hcd *xhci, * endpoint doorbell to restart the ring, but only if there aren't more * cancellations pending. */ -static void handle_set_deq_completion(struct xhci_hcd *xhci, - struct xhci_event_cmd *event, - union xhci_trb *trb) +static void xhci_handle_cmd_set_deq(struct xhci_hcd *xhci, int slot_id, + union xhci_trb *trb, u32 cmd_comp_code) { - unsigned int slot_id; unsigned int ep_index; unsigned int stream_id; struct xhci_ring *ep_ring; - struct xhci_virt_device *dev; + struct xhci_virt_ep *ep; struct xhci_ep_ctx *ep_ctx; struct xhci_slot_ctx *slot_ctx; + struct xhci_stream_ctx *stream_ctx; + struct xhci_td *td, *tmp_td; - slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3])); ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3])); stream_id = TRB_TO_STREAM_ID(le32_to_cpu(trb->generic.field[2])); - dev = xhci->devs[slot_id]; + ep = xhci_get_virt_ep(xhci, slot_id, ep_index); + if (!ep) + return; - ep_ring = xhci_stream_id_to_ring(dev, ep_index, stream_id); + ep_ring = xhci_virt_ep_to_ring(xhci, ep, stream_id); if (!ep_ring) { - xhci_warn(xhci, "WARN Set TR deq ptr command for " - "freed stream ID %u\n", + xhci_warn(xhci, "WARN Set TR deq ptr command for freed stream ID %u\n", stream_id); /* XXX: Harmless??? */ - dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING; - return; + goto cleanup; } - ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index); - slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx); + ep_ctx = xhci_get_ep_ctx(xhci, ep->vdev->out_ctx, ep_index); + slot_ctx = xhci_get_slot_ctx(xhci, ep->vdev->out_ctx); + trace_xhci_handle_cmd_set_deq(slot_ctx); + trace_xhci_handle_cmd_set_deq_ep(ep_ctx); - if (GET_COMP_CODE(le32_to_cpu(event->status)) != COMP_SUCCESS) { + if (ep->ep_state & EP_HAS_STREAMS) { + stream_ctx = &ep->stream_info->stream_ctx_array[stream_id]; + trace_xhci_handle_cmd_set_deq_stream(ep->stream_info, stream_id); + } + + if (cmd_comp_code != COMP_SUCCESS) { unsigned int ep_state; unsigned int slot_state; - switch (GET_COMP_CODE(le32_to_cpu(event->status))) { - case COMP_TRB_ERR: - xhci_warn(xhci, "WARN Set TR Deq Ptr cmd invalid because " - "of stream ID configuration\n"); + switch (cmd_comp_code) { + case COMP_TRB_ERROR: + xhci_warn(xhci, "WARN Set TR Deq Ptr cmd invalid because of stream ID configuration\n"); break; - case COMP_CTX_STATE: - xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed due " - "to incorrect slot or ep state.\n"); - ep_state = le32_to_cpu(ep_ctx->ep_info); - ep_state &= EP_STATE_MASK; + case COMP_CONTEXT_STATE_ERROR: + xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state.\n"); + ep_state = GET_EP_CTX_STATE(ep_ctx); slot_state = le32_to_cpu(slot_ctx->dev_state); slot_state = GET_SLOT_STATE(slot_state); - xhci_dbg(xhci, "Slot state = %u, EP state = %u\n", + xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, + "Slot state = %u, EP state = %u", slot_state, ep_state); break; - case COMP_EBADSLT: - xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed because " - "slot %u was not enabled.\n", slot_id); + case COMP_SLOT_NOT_ENABLED_ERROR: + xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed because slot %u was not enabled.\n", + slot_id); break; default: - xhci_warn(xhci, "WARN Set TR Deq Ptr cmd with unknown " - "completion code of %u.\n", - GET_COMP_CODE(le32_to_cpu(event->status))); + xhci_warn(xhci, "WARN Set TR Deq Ptr cmd with unknown completion code of %u.\n", + cmd_comp_code); break; } /* OK what do we do now? The endpoint state is hosed, and we @@ -1112,459 +1482,471 @@ static void handle_set_deq_completion(struct xhci_hcd *xhci, * cancelling URBs, which might not be an error... */ } else { - xhci_dbg(xhci, "Successful Set TR Deq Ptr cmd, deq = @%08llx\n", - le64_to_cpu(ep_ctx->deq)); - if (xhci_trb_virt_to_dma(dev->eps[ep_index].queued_deq_seg, - dev->eps[ep_index].queued_deq_ptr) == - (le64_to_cpu(ep_ctx->deq) & ~(EP_CTX_CYCLE_MASK))) { + u64 deq; + /* 4.6.10 deq ptr is written to the stream ctx for streams */ + if (ep->ep_state & EP_HAS_STREAMS) { + deq = le64_to_cpu(stream_ctx->stream_ring) & TR_DEQ_PTR_MASK; + + /* + * Cadence xHCI controllers store some endpoint state + * information within Rsvd0 fields of Stream Endpoint + * context. This field is not cleared during Set TR + * Dequeue Pointer command which causes XDMA to skip + * over transfer ring and leads to data loss on stream + * pipe. + * To fix this issue driver must clear Rsvd0 field. + */ + if (xhci->quirks & XHCI_CDNS_SCTX_QUIRK) { + stream_ctx->reserved[0] = 0; + stream_ctx->reserved[1] = 0; + } + } else { + deq = le64_to_cpu(ep_ctx->deq) & TR_DEQ_PTR_MASK; + } + xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, + "Successful Set TR Deq Ptr cmd, deq = @%08llx", deq); + if (xhci_trb_virt_to_dma(ep->queued_deq_seg, + ep->queued_deq_ptr) == deq) { /* Update the ring's dequeue segment and dequeue pointer * to reflect the new position. */ - update_ring_for_set_deq_completion(xhci, dev, - ep_ring, ep_index); + ep_ring->deq_seg = ep->queued_deq_seg; + ep_ring->dequeue = ep->queued_deq_ptr; } else { - xhci_warn(xhci, "Mismatch between completed Set TR Deq " - "Ptr command & xHCI internal state.\n"); + xhci_warn(xhci, "Mismatch between completed Set TR Deq Ptr command & xHCI internal state.\n"); xhci_warn(xhci, "ep deq seg = %p, deq ptr = %p\n", - dev->eps[ep_index].queued_deq_seg, - dev->eps[ep_index].queued_deq_ptr); + ep->queued_deq_seg, ep->queued_deq_ptr); } } - - dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING; - dev->eps[ep_index].queued_deq_seg = NULL; - dev->eps[ep_index].queued_deq_ptr = NULL; - /* Restart any rings with pending URBs */ - ring_doorbell_for_active_rings(xhci, slot_id, ep_index); + /* HW cached TDs cleared from cache, give them back */ + list_for_each_entry_safe(td, tmp_td, &ep->cancelled_td_list, + cancelled_td_list) { + ep_ring = xhci_urb_to_transfer_ring(ep->xhci, td->urb); + if (td->cancel_status == TD_CLEARING_CACHE) { + td->cancel_status = TD_CLEARED; + xhci_dbg(ep->xhci, "%s: Giveback cancelled URB %p TD\n", + __func__, td->urb); + xhci_td_cleanup(ep->xhci, td, ep_ring, td->status); + } else { + xhci_dbg(ep->xhci, "%s: Keep cancelled URB %p TD as cancel_status is %d\n", + __func__, td->urb, td->cancel_status); + } + } +cleanup: + ep->ep_state &= ~SET_DEQ_PENDING; + ep->queued_deq_seg = NULL; + ep->queued_deq_ptr = NULL; + + /* Check for deferred or newly cancelled TDs */ + if (!list_empty(&ep->cancelled_td_list)) { + xhci_dbg(ep->xhci, "%s: Pending TDs to clear, continuing with invalidation\n", + __func__); + xhci_invalidate_cancelled_tds(ep); + /* Try to restart the endpoint if all is done */ + ring_doorbell_for_active_rings(xhci, slot_id, ep_index); + /* Start giving back any TDs invalidated above */ + xhci_giveback_invalidated_tds(ep); + } else { + /* Restart any rings with pending URBs */ + xhci_dbg(ep->xhci, "%s: All TDs cleared, ring doorbell\n", __func__); + ring_doorbell_for_active_rings(xhci, slot_id, ep_index); + } } -static void handle_reset_ep_completion(struct xhci_hcd *xhci, - struct xhci_event_cmd *event, - union xhci_trb *trb) +static void xhci_handle_cmd_reset_ep(struct xhci_hcd *xhci, int slot_id, + union xhci_trb *trb, u32 cmd_comp_code) { - int slot_id; + struct xhci_virt_ep *ep; + struct xhci_ep_ctx *ep_ctx; unsigned int ep_index; - slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3])); ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3])); + ep = xhci_get_virt_ep(xhci, slot_id, ep_index); + if (!ep) + return; + + ep_ctx = xhci_get_ep_ctx(xhci, ep->vdev->out_ctx, ep_index); + trace_xhci_handle_cmd_reset_ep(ep_ctx); + /* This command will only fail if the endpoint wasn't halted, * but we don't care. */ - xhci_dbg(xhci, "Ignoring reset ep completion code of %u\n", - GET_COMP_CODE(le32_to_cpu(event->status))); + xhci_dbg_trace(xhci, trace_xhci_dbg_reset_ep, + "Ignoring reset ep completion code of %u", cmd_comp_code); - /* HW with the reset endpoint quirk needs to have a configure endpoint - * command complete before the endpoint can be used. Queue that here - * because the HW can't handle two commands being queued in a row. - */ - if (xhci->quirks & XHCI_RESET_EP_QUIRK) { - xhci_dbg(xhci, "Queueing configure endpoint command\n"); - xhci_queue_configure_endpoint(xhci, - xhci->devs[slot_id]->in_ctx->dma, slot_id, - false); - xhci_ring_cmd_db(xhci); - } else { - /* Clear our internal halted state and restart the ring(s) */ - xhci->devs[slot_id]->eps[ep_index].ep_state &= ~EP_HALTED; + /* Cleanup cancelled TDs as ep is stopped. May queue a Set TR Deq cmd */ + xhci_invalidate_cancelled_tds(ep); + + /* Clear our internal halted state */ + ep->ep_state &= ~EP_HALTED; + + xhci_giveback_invalidated_tds(ep); + + /* if this was a soft reset, then restart */ + if ((le32_to_cpu(trb->generic.field[3])) & TRB_TSP) ring_doorbell_for_active_rings(xhci, slot_id, ep_index); - } } -/* Complete the command and detele it from the devcie's command queue. - */ -static void xhci_complete_cmd_in_cmd_wait_list(struct xhci_hcd *xhci, - struct xhci_command *command, u32 status) +static void xhci_handle_cmd_enable_slot(int slot_id, struct xhci_command *command, + u32 cmd_comp_code) { - command->status = status; - list_del(&command->cmd_list); - if (command->completion) - complete(command->completion); + if (cmd_comp_code == COMP_SUCCESS) + command->slot_id = slot_id; else - xhci_free_command(xhci, command); + command->slot_id = 0; } - -/* Check to see if a command in the device's command queue matches this one. - * Signal the completion or free the command, and return 1. Return 0 if the - * completed command isn't at the head of the command list. - */ -static int handle_cmd_in_cmd_wait_list(struct xhci_hcd *xhci, - struct xhci_virt_device *virt_dev, - struct xhci_event_cmd *event) +static void xhci_handle_cmd_disable_slot(struct xhci_hcd *xhci, int slot_id, + u32 cmd_comp_code) { - struct xhci_command *command; + struct xhci_virt_device *virt_dev; + struct xhci_slot_ctx *slot_ctx; - if (list_empty(&virt_dev->cmd_list)) - return 0; + virt_dev = xhci->devs[slot_id]; + if (!virt_dev) + return; - command = list_entry(virt_dev->cmd_list.next, - struct xhci_command, cmd_list); - if (xhci->cmd_ring->dequeue != command->command_trb) - return 0; + slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx); + trace_xhci_handle_cmd_disable_slot(slot_ctx); - xhci_complete_cmd_in_cmd_wait_list(xhci, command, - GET_COMP_CODE(le32_to_cpu(event->status))); - return 1; + if (xhci->quirks & XHCI_EP_LIMIT_QUIRK) + /* Delete default control endpoint resources */ + xhci_free_device_endpoint_resources(xhci, virt_dev, true); + if (cmd_comp_code == COMP_SUCCESS) { + xhci->dcbaa->dev_context_ptrs[slot_id] = 0; + xhci->devs[slot_id] = NULL; + } } -/* - * Finding the command trb need to be cancelled and modifying it to - * NO OP command. And if the command is in device's command wait - * list, finishing and freeing it. - * - * If we can't find the command trb, we think it had already been - * executed. - */ -static void xhci_cmd_to_noop(struct xhci_hcd *xhci, struct xhci_cd *cur_cd) +static void xhci_handle_cmd_config_ep(struct xhci_hcd *xhci, int slot_id) { - struct xhci_segment *cur_seg; - union xhci_trb *cmd_trb; - u32 cycle_state; + struct xhci_virt_device *virt_dev; + struct xhci_input_control_ctx *ctrl_ctx; + struct xhci_ep_ctx *ep_ctx; + unsigned int ep_index; + u32 add_flags; - if (xhci->cmd_ring->dequeue == xhci->cmd_ring->enqueue) - return; + /* + * Configure endpoint commands can come from the USB core configuration + * or alt setting changes, or when streams were being configured. + */ - /* find the current segment of command ring */ - cur_seg = find_trb_seg(xhci->cmd_ring->first_seg, - xhci->cmd_ring->dequeue, &cycle_state); - - if (!cur_seg) { - xhci_warn(xhci, "Command ring mismatch, dequeue = %p %llx (dma)\n", - xhci->cmd_ring->dequeue, - (unsigned long long) - xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg, - xhci->cmd_ring->dequeue)); - xhci_debug_ring(xhci, xhci->cmd_ring); - xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring); + virt_dev = xhci->devs[slot_id]; + if (!virt_dev) + return; + ctrl_ctx = xhci_get_input_control_ctx(virt_dev->in_ctx); + if (!ctrl_ctx) { + xhci_warn(xhci, "Could not get input context, bad type.\n"); return; } - /* find the command trb matched by cd from command ring */ - for (cmd_trb = xhci->cmd_ring->dequeue; - cmd_trb != xhci->cmd_ring->enqueue; - next_trb(xhci, xhci->cmd_ring, &cur_seg, &cmd_trb)) { - /* If the trb is link trb, continue */ - if (TRB_TYPE_LINK_LE32(cmd_trb->generic.field[3])) - continue; + add_flags = le32_to_cpu(ctrl_ctx->add_flags); - if (cur_cd->cmd_trb == cmd_trb) { + /* Input ctx add_flags are the endpoint index plus one */ + ep_index = xhci_last_valid_endpoint(add_flags) - 1; - /* If the command in device's command list, we should - * finish it and free the command structure. - */ - if (cur_cd->command) - xhci_complete_cmd_in_cmd_wait_list(xhci, - cur_cd->command, COMP_CMD_STOP); - - /* get cycle state from the origin command trb */ - cycle_state = le32_to_cpu(cmd_trb->generic.field[3]) - & TRB_CYCLE; - - /* modify the command trb to NO OP command */ - cmd_trb->generic.field[0] = 0; - cmd_trb->generic.field[1] = 0; - cmd_trb->generic.field[2] = 0; - cmd_trb->generic.field[3] = cpu_to_le32( - TRB_TYPE(TRB_CMD_NOOP) | cycle_state); - break; - } - } + ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->out_ctx, ep_index); + trace_xhci_handle_cmd_config_ep(ep_ctx); + + return; } -static void xhci_cancel_cmd_in_cd_list(struct xhci_hcd *xhci) +static void xhci_handle_cmd_addr_dev(struct xhci_hcd *xhci, int slot_id) { - struct xhci_cd *cur_cd, *next_cd; + struct xhci_virt_device *vdev; + struct xhci_slot_ctx *slot_ctx; - if (list_empty(&xhci->cancel_cmd_list)) + vdev = xhci->devs[slot_id]; + if (!vdev) return; + slot_ctx = xhci_get_slot_ctx(xhci, vdev->out_ctx); + trace_xhci_handle_cmd_addr_dev(slot_ctx); +} - list_for_each_entry_safe(cur_cd, next_cd, - &xhci->cancel_cmd_list, cancel_cmd_list) { - xhci_cmd_to_noop(xhci, cur_cd); - list_del(&cur_cd->cancel_cmd_list); - kfree(cur_cd); +static void xhci_handle_cmd_reset_dev(struct xhci_hcd *xhci, int slot_id) +{ + struct xhci_virt_device *vdev; + struct xhci_slot_ctx *slot_ctx; + + vdev = xhci->devs[slot_id]; + if (!vdev) { + xhci_warn(xhci, "Reset device command completion for disabled slot %u\n", + slot_id); + return; } + slot_ctx = xhci_get_slot_ctx(xhci, vdev->out_ctx); + trace_xhci_handle_cmd_reset_dev(slot_ctx); + + xhci_dbg(xhci, "Completed reset device command.\n"); } -/* - * traversing the cancel_cmd_list. If the command descriptor according - * to cmd_trb is found, the function free it and return 1, otherwise - * return 0. - */ -static int xhci_search_cmd_trb_in_cd_list(struct xhci_hcd *xhci, - union xhci_trb *cmd_trb) +static void xhci_handle_cmd_nec_get_fw(struct xhci_hcd *xhci, + struct xhci_event_cmd *event) { - struct xhci_cd *cur_cd, *next_cd; + if (!(xhci->quirks & XHCI_NEC_HOST)) { + xhci_warn(xhci, "WARN NEC_GET_FW command on non-NEC host\n"); + return; + } + xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, + "NEC firmware version %2x.%02x", + NEC_FW_MAJOR(le32_to_cpu(event->status)), + NEC_FW_MINOR(le32_to_cpu(event->status))); +} - if (list_empty(&xhci->cancel_cmd_list)) - return 0; +static void xhci_complete_del_and_free_cmd(struct xhci_command *cmd, u32 comp_code, u32 comp_param) +{ + list_del(&cmd->cmd_list); - list_for_each_entry_safe(cur_cd, next_cd, - &xhci->cancel_cmd_list, cancel_cmd_list) { - if (cur_cd->cmd_trb == cmd_trb) { - if (cur_cd->command) - xhci_complete_cmd_in_cmd_wait_list(xhci, - cur_cd->command, COMP_CMD_STOP); - list_del(&cur_cd->cancel_cmd_list); - kfree(cur_cd); - return 1; - } + if (cmd->completion) { + cmd->status = comp_code; + cmd->comp_param = comp_param; + complete(cmd->completion); + } else { + kfree(cmd); } +} - return 0; +void xhci_cleanup_command_queue(struct xhci_hcd *xhci) +{ + struct xhci_command *cur_cmd, *tmp_cmd; + xhci->current_cmd = NULL; + list_for_each_entry_safe(cur_cmd, tmp_cmd, &xhci->cmd_list, cmd_list) + xhci_complete_del_and_free_cmd(cur_cmd, COMP_COMMAND_ABORTED, 0); } -/* - * If the cmd_trb_comp_code is COMP_CMD_ABORT, we just check whether the - * trb pointed by the command ring dequeue pointer is the trb we want to - * cancel or not. And if the cmd_trb_comp_code is COMP_CMD_STOP, we will - * traverse the cancel_cmd_list to trun the all of the commands according - * to command descriptor to NO-OP trb. - */ -static int handle_stopped_cmd_ring(struct xhci_hcd *xhci, - int cmd_trb_comp_code) +void xhci_handle_command_timeout(struct work_struct *work) { - int cur_trb_is_good = 0; + struct xhci_hcd *xhci; + unsigned long flags; + char str[XHCI_MSG_MAX]; + u64 hw_ring_state; + u32 cmd_field3; + u32 usbsts; + + xhci = container_of(to_delayed_work(work), struct xhci_hcd, cmd_timer); + + spin_lock_irqsave(&xhci->lock, flags); - /* Searching the cmd trb pointed by the command ring dequeue - * pointer in command descriptor list. If it is found, free it. + /* + * If timeout work is pending, or current_cmd is NULL, it means we + * raced with command completion. Command is handled so just return. */ - cur_trb_is_good = xhci_search_cmd_trb_in_cd_list(xhci, - xhci->cmd_ring->dequeue); + if (!xhci->current_cmd || delayed_work_pending(&xhci->cmd_timer)) { + spin_unlock_irqrestore(&xhci->lock, flags); + return; + } - if (cmd_trb_comp_code == COMP_CMD_ABORT) - xhci->cmd_ring_state = CMD_RING_STATE_STOPPED; - else if (cmd_trb_comp_code == COMP_CMD_STOP) { - /* traversing the cancel_cmd_list and canceling - * the command according to command descriptor - */ - xhci_cancel_cmd_in_cd_list(xhci); + cmd_field3 = le32_to_cpu(xhci->current_cmd->command_trb->generic.field[3]); + usbsts = readl(&xhci->op_regs->status); + xhci_dbg(xhci, "Command timeout, USBSTS:%s\n", xhci_decode_usbsts(str, usbsts)); - xhci->cmd_ring_state = CMD_RING_STATE_RUNNING; - /* - * ring command ring doorbell again to restart the - * command ring - */ - if (xhci->cmd_ring->dequeue != xhci->cmd_ring->enqueue) - xhci_ring_cmd_db(xhci); + /* Bail out and tear down xhci if a stop endpoint command failed */ + if (TRB_FIELD_TO_TYPE(cmd_field3) == TRB_STOP_RING) { + struct xhci_virt_ep *ep; + + xhci_warn(xhci, "xHCI host not responding to stop endpoint command\n"); + + ep = xhci_get_virt_ep(xhci, TRB_TO_SLOT_ID(cmd_field3), + TRB_TO_EP_INDEX(cmd_field3)); + if (ep) + ep->ep_state &= ~EP_STOP_CMD_PENDING; + + xhci_halt(xhci); + xhci_hc_died(xhci); + goto time_out_completed; + } + + /* mark this command to be cancelled */ + xhci->current_cmd->status = COMP_COMMAND_ABORTED; + + /* Make sure command ring is running before aborting it */ + hw_ring_state = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); + if (hw_ring_state == ~(u64)0) { + xhci_hc_died(xhci); + goto time_out_completed; + } + + if ((xhci->cmd_ring_state & CMD_RING_STATE_RUNNING) && + (hw_ring_state & CMD_RING_RUNNING)) { + /* Prevent new doorbell, and start command abort */ + xhci->cmd_ring_state = CMD_RING_STATE_ABORTED; + xhci_dbg(xhci, "Command timeout\n"); + xhci_abort_cmd_ring(xhci, flags); + goto time_out_completed; } - return cur_trb_is_good; + + /* host removed. Bail out */ + if (xhci->xhc_state & XHCI_STATE_REMOVING) { + xhci_dbg(xhci, "host removed, ring start fail?\n"); + xhci_cleanup_command_queue(xhci); + + goto time_out_completed; + } + + /* command timeout on stopped ring, ring can't be aborted */ + xhci_dbg(xhci, "Command timeout on stopped ring\n"); + xhci_handle_stopped_cmd_ring(xhci, xhci->current_cmd); + +time_out_completed: + spin_unlock_irqrestore(&xhci->lock, flags); + return; } static void handle_cmd_completion(struct xhci_hcd *xhci, struct xhci_event_cmd *event) { - int slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); + unsigned int slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); + u32 status = le32_to_cpu(event->status); u64 cmd_dma; dma_addr_t cmd_dequeue_dma; - struct xhci_input_control_ctx *ctrl_ctx; - struct xhci_virt_device *virt_dev; - unsigned int ep_index; - struct xhci_ring *ep_ring; - unsigned int ep_state; + u32 cmd_comp_code; + union xhci_trb *cmd_trb; + struct xhci_command *cmd; + u32 cmd_type; + + if (slot_id >= MAX_HC_SLOTS) { + xhci_warn(xhci, "Invalid slot_id %u\n", slot_id); + return; + } cmd_dma = le64_to_cpu(event->cmd_trb); + cmd_trb = xhci->cmd_ring->dequeue; + + trace_xhci_handle_command(xhci->cmd_ring, &cmd_trb->generic, cmd_dma); + + cmd_comp_code = GET_COMP_CODE(le32_to_cpu(event->status)); + + /* If CMD ring stopped we own the trbs between enqueue and dequeue */ + if (cmd_comp_code == COMP_COMMAND_RING_STOPPED) { + complete_all(&xhci->cmd_ring_stop_completion); + return; + } + cmd_dequeue_dma = xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg, - xhci->cmd_ring->dequeue); - /* Is the command ring deq ptr out of sync with the deq seg ptr? */ - if (cmd_dequeue_dma == 0) { - xhci->error_bitmask |= 1 << 4; + cmd_trb); + /* + * Check whether the completion event is for our internal kept + * command. + */ + if (!cmd_dequeue_dma || cmd_dma != (u64)cmd_dequeue_dma) { + xhci_warn(xhci, + "ERROR mismatched command completion event\n"); return; } - /* Does the DMA address match our internal dequeue pointer address? */ - if (cmd_dma != (u64) cmd_dequeue_dma) { - xhci->error_bitmask |= 1 << 5; + + cmd = list_first_entry(&xhci->cmd_list, struct xhci_command, cmd_list); + + cancel_delayed_work(&xhci->cmd_timer); + + if (cmd->command_trb != xhci->cmd_ring->dequeue) { + xhci_err(xhci, + "Command completion event does not match command\n"); return; } - if ((GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_CMD_ABORT) || - (GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_CMD_STOP)) { - /* If the return value is 0, we think the trb pointed by - * command ring dequeue pointer is a good trb. The good - * trb means we don't want to cancel the trb, but it have - * been stopped by host. So we should handle it normally. - * Otherwise, driver should invoke inc_deq() and return. - */ - if (handle_stopped_cmd_ring(xhci, - GET_COMP_CODE(le32_to_cpu(event->status)))) { - inc_deq(xhci, xhci->cmd_ring); - return; + /* + * Host aborted the command ring, check if the current command was + * supposed to be aborted, otherwise continue normally. + * The command ring is stopped now, but the xHC will issue a Command + * Ring Stopped event which will cause us to restart it. + */ + if (cmd_comp_code == COMP_COMMAND_ABORTED) { + xhci->cmd_ring_state = CMD_RING_STATE_STOPPED; + if (cmd->status == COMP_COMMAND_ABORTED) { + if (xhci->current_cmd == cmd) + xhci->current_cmd = NULL; + goto event_handled; } } - switch (le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3]) - & TRB_TYPE_BITMASK) { - case TRB_TYPE(TRB_ENABLE_SLOT): - if (GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_SUCCESS) - xhci->slot_id = slot_id; - else - xhci->slot_id = 0; - complete(&xhci->addr_dev); + cmd_type = TRB_FIELD_TO_TYPE(le32_to_cpu(cmd_trb->generic.field[3])); + switch (cmd_type) { + case TRB_ENABLE_SLOT: + xhci_handle_cmd_enable_slot(slot_id, cmd, cmd_comp_code); break; - case TRB_TYPE(TRB_DISABLE_SLOT): - if (xhci->devs[slot_id]) { - if (xhci->quirks & XHCI_EP_LIMIT_QUIRK) - /* Delete default control endpoint resources */ - xhci_free_device_endpoint_resources(xhci, - xhci->devs[slot_id], true); - xhci_free_virt_device(xhci, slot_id); - } + case TRB_DISABLE_SLOT: + xhci_handle_cmd_disable_slot(xhci, slot_id, cmd_comp_code); break; - case TRB_TYPE(TRB_CONFIG_EP): - virt_dev = xhci->devs[slot_id]; - if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event)) - break; - /* - * Configure endpoint commands can come from the USB core - * configuration or alt setting changes, or because the HW - * needed an extra configure endpoint command after a reset - * endpoint command or streams were being configured. - * If the command was for a halted endpoint, the xHCI driver - * is not waiting on the configure endpoint command. - */ - ctrl_ctx = xhci_get_input_control_ctx(xhci, - virt_dev->in_ctx); - if (!ctrl_ctx) { - xhci_warn(xhci, "Could not get input context, bad type.\n"); - break; - } - /* Input ctx add_flags are the endpoint index plus one */ - ep_index = xhci_last_valid_endpoint(le32_to_cpu(ctrl_ctx->add_flags)) - 1; - /* A usb_set_interface() call directly after clearing a halted - * condition may race on this quirky hardware. Not worth - * worrying about, since this is prototype hardware. Not sure - * if this will work for streams, but streams support was - * untested on this prototype. - */ - if (xhci->quirks & XHCI_RESET_EP_QUIRK && - ep_index != (unsigned int) -1 && - le32_to_cpu(ctrl_ctx->add_flags) - SLOT_FLAG == - le32_to_cpu(ctrl_ctx->drop_flags)) { - ep_ring = xhci->devs[slot_id]->eps[ep_index].ring; - ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state; - if (!(ep_state & EP_HALTED)) - goto bandwidth_change; - xhci_dbg(xhci, "Completed config ep cmd - " - "last ep index = %d, state = %d\n", - ep_index, ep_state); - /* Clear internal halted state and restart ring(s) */ - xhci->devs[slot_id]->eps[ep_index].ep_state &= - ~EP_HALTED; - ring_doorbell_for_active_rings(xhci, slot_id, ep_index); - break; - } -bandwidth_change: - xhci_dbg(xhci, "Completed config ep cmd\n"); - xhci->devs[slot_id]->cmd_status = - GET_COMP_CODE(le32_to_cpu(event->status)); - complete(&xhci->devs[slot_id]->cmd_completion); + case TRB_CONFIG_EP: + if (!cmd->completion) + xhci_handle_cmd_config_ep(xhci, slot_id); break; - case TRB_TYPE(TRB_EVAL_CONTEXT): - virt_dev = xhci->devs[slot_id]; - if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event)) - break; - xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(le32_to_cpu(event->status)); - complete(&xhci->devs[slot_id]->cmd_completion); + case TRB_EVAL_CONTEXT: break; - case TRB_TYPE(TRB_ADDR_DEV): - xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(le32_to_cpu(event->status)); - complete(&xhci->addr_dev); + case TRB_ADDR_DEV: + xhci_handle_cmd_addr_dev(xhci, slot_id); break; - case TRB_TYPE(TRB_STOP_RING): - handle_stopped_endpoint(xhci, xhci->cmd_ring->dequeue, event); + case TRB_STOP_RING: + WARN_ON(slot_id != TRB_TO_SLOT_ID( + le32_to_cpu(cmd_trb->generic.field[3]))); + if (!cmd->completion) + xhci_handle_cmd_stop_ep(xhci, slot_id, cmd_trb, + cmd_comp_code); break; - case TRB_TYPE(TRB_SET_DEQ): - handle_set_deq_completion(xhci, event, xhci->cmd_ring->dequeue); + case TRB_SET_DEQ: + WARN_ON(slot_id != TRB_TO_SLOT_ID( + le32_to_cpu(cmd_trb->generic.field[3]))); + xhci_handle_cmd_set_deq(xhci, slot_id, cmd_trb, cmd_comp_code); break; - case TRB_TYPE(TRB_CMD_NOOP): + case TRB_CMD_NOOP: + /* Is this an aborted command turned to NO-OP? */ + if (cmd->status == COMP_COMMAND_RING_STOPPED) + cmd_comp_code = COMP_COMMAND_RING_STOPPED; break; - case TRB_TYPE(TRB_RESET_EP): - handle_reset_ep_completion(xhci, event, xhci->cmd_ring->dequeue); + case TRB_RESET_EP: + WARN_ON(slot_id != TRB_TO_SLOT_ID( + le32_to_cpu(cmd_trb->generic.field[3]))); + xhci_handle_cmd_reset_ep(xhci, slot_id, cmd_trb, cmd_comp_code); break; - case TRB_TYPE(TRB_RESET_DEV): - xhci_dbg(xhci, "Completed reset device command.\n"); + case TRB_RESET_DEV: + /* SLOT_ID field in reset device cmd completion event TRB is 0. + * Use the SLOT_ID from the command TRB instead (xhci 4.6.11) + */ slot_id = TRB_TO_SLOT_ID( - le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3])); - virt_dev = xhci->devs[slot_id]; - if (virt_dev) - handle_cmd_in_cmd_wait_list(xhci, virt_dev, event); - else - xhci_warn(xhci, "Reset device command completion " - "for disabled slot %u\n", slot_id); + le32_to_cpu(cmd_trb->generic.field[3])); + xhci_handle_cmd_reset_dev(xhci, slot_id); break; - case TRB_TYPE(TRB_NEC_GET_FW): - if (!(xhci->quirks & XHCI_NEC_HOST)) { - xhci->error_bitmask |= 1 << 6; - break; - } - xhci_dbg(xhci, "NEC firmware version %2x.%02x\n", - NEC_FW_MAJOR(le32_to_cpu(event->status)), - NEC_FW_MINOR(le32_to_cpu(event->status))); + case TRB_NEC_GET_FW: + xhci_handle_cmd_nec_get_fw(xhci, event); + break; + case TRB_GET_BW: break; default: /* Skip over unknown commands on the event ring */ - xhci->error_bitmask |= 1 << 6; + xhci_info(xhci, "INFO unknown command type %d\n", cmd_type); break; } + + /* restart timer if this wasn't the last command */ + if (!list_is_singular(&xhci->cmd_list)) { + xhci->current_cmd = list_first_entry(&cmd->cmd_list, + struct xhci_command, cmd_list); + xhci_mod_cmd_timer(xhci); + } else if (xhci->current_cmd == cmd) { + xhci->current_cmd = NULL; + } + +event_handled: + xhci_complete_del_and_free_cmd(cmd, cmd_comp_code, COMP_PARAM(status)); + inc_deq(xhci, xhci->cmd_ring); } static void handle_vendor_event(struct xhci_hcd *xhci, - union xhci_trb *event) + union xhci_trb *event, u32 trb_type) { - u32 trb_type; - - trb_type = TRB_FIELD_TO_TYPE(le32_to_cpu(event->generic.field[3])); xhci_dbg(xhci, "Vendor specific event TRB type = %u\n", trb_type); if (trb_type == TRB_NEC_CMD_COMP && (xhci->quirks & XHCI_NEC_HOST)) handle_cmd_completion(xhci, &event->event_cmd); } -/* @port_id: the one-based port ID from the hardware (indexed from array of all - * port registers -- USB 3.0 and USB 2.0). - * - * Returns a zero-based port number, which is suitable for indexing into each of - * the split roothubs' port arrays and bus state arrays. - * Add one to it in order to call xhci_find_slot_id_by_port. - */ -static unsigned int find_faked_portnum_from_hw_portnum(struct usb_hcd *hcd, - struct xhci_hcd *xhci, u32 port_id) -{ - unsigned int i; - unsigned int num_similar_speed_ports = 0; - - /* port_id from the hardware is 1-based, but port_array[], usb3_ports[], - * and usb2_ports are 0-based indexes. Count the number of similar - * speed ports, up to 1 port before this port. - */ - for (i = 0; i < (port_id - 1); i++) { - u8 port_speed = xhci->port_array[i]; - - /* - * Skip ports that don't have known speeds, or have duplicate - * Extended Capabilities port speed entries. - */ - if (port_speed == 0 || port_speed == DUPLICATE_ENTRY) - continue; - - /* - * USB 3.0 ports are always under a USB 3.0 hub. USB 2.0 and - * 1.1 ports are under the USB 2.0 hub. If the port speed - * matches the device speed, it's a similar speed port. - */ - if ((port_speed == 0x03) == (hcd->speed == HCD_USB3)) - num_similar_speed_ports++; - } - return num_similar_speed_ports; -} - static void handle_device_notification(struct xhci_hcd *xhci, union xhci_trb *event) { u32 slot_id; struct usb_device *udev; - slot_id = TRB_TO_SLOT_ID(event->generic.field[3]); + slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->generic.field[3])); if (!xhci->devs[slot_id]) { xhci_warn(xhci, "Device Notification event for " "unused slot %u\n", slot_id); @@ -1578,151 +1960,185 @@ static void handle_device_notification(struct xhci_hcd *xhci, usb_wakeup_notification(udev->parent, udev->portnum); } -static void handle_port_status(struct xhci_hcd *xhci, - union xhci_trb *event) +/* + * Quirk hanlder for errata seen on Cavium ThunderX2 processor XHCI + * Controller. + * As per ThunderX2errata-129 USB 2 device may come up as USB 1 + * If a connection to a USB 1 device is followed by another connection + * to a USB 2 device. + * + * Reset the PHY after the USB device is disconnected if device speed + * is less than HCD_USB3. + * Retry the reset sequence max of 4 times checking the PLL lock status. + * + */ +static void xhci_cavium_reset_phy_quirk(struct xhci_hcd *xhci) +{ + struct usb_hcd *hcd = xhci_to_hcd(xhci); + u32 pll_lock_check; + u32 retry_count = 4; + + do { + /* Assert PHY reset */ + writel(0x6F, hcd->regs + 0x1048); + udelay(10); + /* De-assert the PHY reset */ + writel(0x7F, hcd->regs + 0x1048); + udelay(200); + pll_lock_check = readl(hcd->regs + 0x1070); + } while (!(pll_lock_check & 0x1) && --retry_count); +} + +static void handle_port_status(struct xhci_hcd *xhci, union xhci_trb *event) { + struct xhci_virt_device *vdev = NULL; struct usb_hcd *hcd; u32 port_id; - u32 temp, temp1; - int max_ports; - int slot_id; - unsigned int faked_port_index; - u8 major_revision; + u32 portsc, cmd_reg; + unsigned int hcd_portnum; struct xhci_bus_state *bus_state; - __le32 __iomem **port_array; bool bogus_port_status = false; + struct xhci_port *port; /* Port status change events always have a successful completion code */ - if (GET_COMP_CODE(le32_to_cpu(event->generic.field[2])) != COMP_SUCCESS) { - xhci_warn(xhci, "WARN: xHC returned failed port status event\n"); - xhci->error_bitmask |= 1 << 8; - } + if (GET_COMP_CODE(le32_to_cpu(event->generic.field[2])) != COMP_SUCCESS) + xhci_warn(xhci, + "WARN: xHC returned failed port status event\n"); + port_id = GET_PORT_ID(le32_to_cpu(event->generic.field[0])); - xhci_dbg(xhci, "Port Status Change Event for port %d\n", port_id); - max_ports = HCS_MAX_PORTS(xhci->hcs_params1); - if ((port_id <= 0) || (port_id > max_ports)) { - xhci_warn(xhci, "Invalid port id %d\n", port_id); - inc_deq(xhci, xhci->event_ring); + if ((port_id <= 0) || (port_id > xhci->max_ports)) { + xhci_warn(xhci, "Port change event with invalid port ID %d\n", + port_id); return; } - /* Figure out which usb_hcd this port is attached to: - * is it a USB 3.0 port or a USB 2.0/1.1 port? - */ - major_revision = xhci->port_array[port_id - 1]; - - /* Find the right roothub. */ - hcd = xhci_to_hcd(xhci); - if ((major_revision == 0x03) != (hcd->speed == HCD_USB3)) - hcd = xhci->shared_hcd; - - if (major_revision == 0) { - xhci_warn(xhci, "Event for port %u not in " - "Extended Capabilities, ignoring.\n", - port_id); + port = &xhci->hw_ports[port_id - 1]; + if (!port || !port->rhub || port->hcd_portnum == DUPLICATE_ENTRY) { + xhci_warn(xhci, "Port change event, no port for port ID %u\n", + port_id); bogus_port_status = true; goto cleanup; } - if (major_revision == DUPLICATE_ENTRY) { - xhci_warn(xhci, "Event for port %u duplicated in" - "Extended Capabilities, ignoring.\n", - port_id); + + if (port->slot_id) + vdev = xhci->devs[port->slot_id]; + + /* We might get interrupts after shared_hcd is removed */ + if (port->rhub == &xhci->usb3_rhub && xhci->shared_hcd == NULL) { + xhci_dbg(xhci, "ignore port event for removed USB3 hcd\n"); bogus_port_status = true; goto cleanup; } - /* - * Hardware port IDs reported by a Port Status Change Event include USB - * 3.0 and USB 2.0 ports. We want to check if the port has reported a - * resume event, but we first need to translate the hardware port ID - * into the index into the ports on the correct split roothub, and the - * correct bus_state structure. - */ - bus_state = &xhci->bus_state[hcd_index(hcd)]; - if (hcd->speed == HCD_USB3) - port_array = xhci->usb3_ports; - else - port_array = xhci->usb2_ports; - /* Find the faked port hub number */ - faked_port_index = find_faked_portnum_from_hw_portnum(hcd, xhci, - port_id); + hcd = port->rhub->hcd; + bus_state = &port->rhub->bus_state; + hcd_portnum = port->hcd_portnum; + portsc = xhci_portsc_readl(port); + + xhci_dbg(xhci, "Port change event, %d-%d, id %d, portsc: 0x%x\n", + hcd->self.busnum, hcd_portnum + 1, port_id, portsc); + + trace_xhci_handle_port_status(port, portsc); - temp = xhci_readl(xhci, port_array[faked_port_index]); if (hcd->state == HC_STATE_SUSPENDED) { xhci_dbg(xhci, "resume root hub\n"); usb_hcd_resume_root_hub(hcd); } - if ((temp & PORT_PLC) && (temp & PORT_PLS_MASK) == XDEV_RESUME) { + if (vdev && (portsc & PORT_PLS_MASK) == XDEV_INACTIVE) { + if (!(portsc & PORT_RESET)) + vdev->flags |= VDEV_PORT_ERROR; + } else if (vdev && portsc & PORT_RC) { + vdev->flags &= ~VDEV_PORT_ERROR; + } + + if ((portsc & PORT_PLC) && (portsc & PORT_PLS_MASK) == XDEV_RESUME) { xhci_dbg(xhci, "port resume event for port %d\n", port_id); - temp1 = xhci_readl(xhci, &xhci->op_regs->command); - if (!(temp1 & CMD_RUN)) { + cmd_reg = readl(&xhci->op_regs->command); + if (!(cmd_reg & CMD_RUN)) { xhci_warn(xhci, "xHC is not running.\n"); goto cleanup; } - if (DEV_SUPERSPEED(temp)) { + if (DEV_SUPERSPEED_ANY(portsc)) { xhci_dbg(xhci, "remote wake SS port %d\n", port_id); /* Set a flag to say the port signaled remote wakeup, * so we can tell the difference between the end of * device and host initiated resume. */ - bus_state->port_remote_wakeup |= 1 << faked_port_index; - xhci_test_and_clear_bit(xhci, port_array, - faked_port_index, PORT_PLC); - xhci_set_link_state(xhci, port_array, faked_port_index, - XDEV_U0); + bus_state->port_remote_wakeup |= 1 << hcd_portnum; + xhci_test_and_clear_bit(xhci, port, PORT_PLC); + usb_hcd_start_port_resume(&hcd->self, hcd_portnum); + xhci_set_link_state(xhci, port, XDEV_U0); /* Need to wait until the next link state change * indicates the device is actually in U0. */ bogus_port_status = true; goto cleanup; - } else { + } else if (!test_bit(hcd_portnum, &bus_state->resuming_ports)) { xhci_dbg(xhci, "resume HS port %d\n", port_id); - bus_state->resume_done[faked_port_index] = jiffies + - msecs_to_jiffies(20); - set_bit(faked_port_index, &bus_state->resuming_ports); + port->resume_timestamp = jiffies + + msecs_to_jiffies(USB_RESUME_TIMEOUT); + set_bit(hcd_portnum, &bus_state->resuming_ports); + /* Do the rest in GetPortStatus after resume time delay. + * Avoid polling roothub status before that so that a + * usb device auto-resume latency around ~40ms. + */ + set_bit(HCD_FLAG_POLL_RH, &hcd->flags); mod_timer(&hcd->rh_timer, - bus_state->resume_done[faked_port_index]); - /* Do the rest in GetPortStatus */ + port->resume_timestamp); + usb_hcd_start_port_resume(&hcd->self, hcd_portnum); + bogus_port_status = true; } } - if ((temp & PORT_PLC) && (temp & PORT_PLS_MASK) == XDEV_U0 && - DEV_SUPERSPEED(temp)) { + if ((portsc & PORT_PLC) && + DEV_SUPERSPEED_ANY(portsc) && + ((portsc & PORT_PLS_MASK) == XDEV_U0 || + (portsc & PORT_PLS_MASK) == XDEV_U1 || + (portsc & PORT_PLS_MASK) == XDEV_U2)) { xhci_dbg(xhci, "resume SS port %d finished\n", port_id); - /* We've just brought the device into U0 through either the + complete(&port->u3exit_done); + /* We've just brought the device into U0/1/2 through either the * Resume state after a device remote wakeup, or through the * U3Exit state after a host-initiated resume. If it's a device * initiated remote wake, don't pass up the link state change, * so the roothub behavior is consistent with external * USB 3.0 hub behavior. */ - slot_id = xhci_find_slot_id_by_port(hcd, xhci, - faked_port_index + 1); - if (slot_id && xhci->devs[slot_id]) - xhci_ring_device(xhci, slot_id); - if (bus_state->port_remote_wakeup & (1 << faked_port_index)) { - bus_state->port_remote_wakeup &= - ~(1 << faked_port_index); - xhci_test_and_clear_bit(xhci, port_array, - faked_port_index, PORT_PLC); + if (vdev) + xhci_ring_device(xhci, port->slot_id); + if (bus_state->port_remote_wakeup & (1 << hcd_portnum)) { + xhci_test_and_clear_bit(xhci, port, PORT_PLC); usb_wakeup_notification(hcd->self.root_hub, - faked_port_index + 1); + hcd_portnum + 1); bogus_port_status = true; goto cleanup; } } - if (hcd->speed != HCD_USB3) - xhci_test_and_clear_bit(xhci, port_array, faked_port_index, - PORT_PLC); + /* + * Check to see if xhci-hub.c is waiting on RExit to U0 transition (or + * RExit to a disconnect state). If so, let the driver know it's + * out of the RExit state. + */ + if (hcd->speed < HCD_USB3 && port->rexit_active) { + complete(&port->rexit_done); + port->rexit_active = false; + bogus_port_status = true; + goto cleanup; + } + + if (hcd->speed < HCD_USB3) { + xhci_test_and_clear_bit(xhci, port, PORT_PLC); + if ((xhci->quirks & XHCI_RESET_PLL_ON_DISCONNECT) && + (portsc & PORT_CSC) && !(portsc & PORT_CONNECT)) + xhci_cavium_reset_phy_quirk(xhci); + } cleanup: - /* Update event ring dequeue pointer before dropping the lock */ - inc_deq(xhci, xhci->event_ring); /* Don't make the USB core poll the roothub if we got a bad port status * change event. Besides, at that point we can't tell which roothub @@ -1738,7 +2154,8 @@ cleanup: * bits are still set. When an event occurs, switch over to * polling to avoid losing status changes. */ - xhci_dbg(xhci, "%s: starting port polling.\n", __func__); + xhci_dbg(xhci, "%s: starting usb%d port polling.\n", + __func__, hcd->self.busnum); set_bit(HCD_FLAG_POLL_RH, &hcd->flags); spin_unlock(&xhci->lock); /* Pass this up to the core */ @@ -1746,108 +2163,58 @@ cleanup: spin_lock(&xhci->lock); } -/* - * This TD is defined by the TRBs starting at start_trb in start_seg and ending - * at end_trb, which may be in another segment. If the suspect DMA address is a - * TRB in this TD, this function returns that TRB's segment. Otherwise it - * returns 0. - */ -struct xhci_segment *trb_in_td(struct xhci_segment *start_seg, - union xhci_trb *start_trb, - union xhci_trb *end_trb, - dma_addr_t suspect_dma) +static void xhci_clear_hub_tt_buffer(struct xhci_hcd *xhci, struct xhci_td *td, + struct xhci_virt_ep *ep) { - dma_addr_t start_dma; - dma_addr_t end_seg_dma; - dma_addr_t end_trb_dma; - struct xhci_segment *cur_seg; - - start_dma = xhci_trb_virt_to_dma(start_seg, start_trb); - cur_seg = start_seg; - - do { - if (start_dma == 0) - return NULL; - /* We may get an event for a Link TRB in the middle of a TD */ - end_seg_dma = xhci_trb_virt_to_dma(cur_seg, - &cur_seg->trbs[TRBS_PER_SEGMENT - 1]); - /* If the end TRB isn't in this segment, this is set to 0 */ - end_trb_dma = xhci_trb_virt_to_dma(cur_seg, end_trb); - - if (end_trb_dma > 0) { - /* The end TRB is in this segment, so suspect should be here */ - if (start_dma <= end_trb_dma) { - if (suspect_dma >= start_dma && suspect_dma <= end_trb_dma) - return cur_seg; - } else { - /* Case for one segment with - * a TD wrapped around to the top - */ - if ((suspect_dma >= start_dma && - suspect_dma <= end_seg_dma) || - (suspect_dma >= cur_seg->dma && - suspect_dma <= end_trb_dma)) - return cur_seg; - } - return NULL; - } else { - /* Might still be somewhere in this segment */ - if (suspect_dma >= start_dma && suspect_dma <= end_seg_dma) - return cur_seg; - } - cur_seg = cur_seg->next; - start_dma = xhci_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]); - } while (cur_seg != start_seg); - - return NULL; + /* + * As part of low/full-speed endpoint-halt processing + * we must clear the TT buffer (USB 2.0 specification 11.17.5). + */ + if (td->urb->dev->tt && !usb_pipeint(td->urb->pipe) && + (td->urb->dev->tt->hub != xhci_to_hcd(xhci)->self.root_hub) && + !(ep->ep_state & EP_CLEARING_TT)) { + ep->ep_state |= EP_CLEARING_TT; + td->urb->ep->hcpriv = td->urb->dev; + if (usb_hub_clear_tt_buffer(td->urb)) + ep->ep_state &= ~EP_CLEARING_TT; + } } -static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci, - unsigned int slot_id, unsigned int ep_index, - unsigned int stream_id, - struct xhci_td *td, union xhci_trb *event_trb) +/* + * Check if xhci internal endpoint state has gone to a "halt" state due to an + * error or stall, including default control pipe protocol stall. + * The internal halt needs to be cleared with a reset endpoint command. + * + * External device side is also halted in functional stall cases. Class driver + * will clear the device halt with a CLEAR_FEATURE(ENDPOINT_HALT) request later. + */ +static bool xhci_halted_host_endpoint(struct xhci_hcd *xhci, struct xhci_ep_ctx *ep_ctx, + unsigned int comp_code) { - struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index]; - ep->ep_state |= EP_HALTED; - ep->stopped_td = td; - ep->stopped_trb = event_trb; - ep->stopped_stream = stream_id; + int ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2)); - xhci_queue_reset_ep(xhci, slot_id, ep_index); - xhci_cleanup_stalled_ring(xhci, td->urb->dev, ep_index); - - ep->stopped_td = NULL; - ep->stopped_trb = NULL; - ep->stopped_stream = 0; - - xhci_ring_cmd_db(xhci); -} - -/* Check if an error has halted the endpoint ring. The class driver will - * cleanup the halt for a non-default control endpoint if we indicate a stall. - * However, a babble and other errors also halt the endpoint ring, and the class - * driver won't clear the halt in that case, so we need to issue a Set Transfer - * Ring Dequeue Pointer command manually. - */ -static int xhci_requires_manual_halt_cleanup(struct xhci_hcd *xhci, - struct xhci_ep_ctx *ep_ctx, - unsigned int trb_comp_code) -{ - /* TRB completion codes that may require a manual halt cleanup */ - if (trb_comp_code == COMP_TX_ERR || - trb_comp_code == COMP_BABBLE || - trb_comp_code == COMP_SPLIT_ERR) - /* The 0.96 spec says a babbling control endpoint - * is not halted. The 0.96 spec says it is. Some HW - * claims to be 0.95 compliant, but it halts the control - * endpoint anyway. Check if a babble halted the - * endpoint. + switch (comp_code) { + case COMP_STALL_ERROR: + /* on xHCI this always halts, including protocol stall */ + return true; + case COMP_BABBLE_DETECTED_ERROR: + /* + * The 0.95 spec says a babbling control endpoint is not halted. + * The 0.96 spec says it is. Some HW claims to be 0.95 + * compliant, but it halts the control endpoint anyway. + * Check endpoint context if endpoint is halted. */ - if ((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) == - cpu_to_le32(EP_STATE_HALTED)) - return 1; + if (xhci->hci_version <= 0x95 && ep_type == CTRL_EP) + return GET_EP_CTX_STATE(ep_ctx) == EP_STATE_HALTED; + + fallthrough; + case COMP_USB_TRANSACTION_ERROR: + case COMP_SPLIT_TRANSACTION_ERROR: + /* these errors halt all non-isochronous endpoints */ + return ep_type != ISOC_IN_EP && ep_type != ISOC_OUT_EP; + } - return 0; + return false; } int xhci_is_vendor_info_code(struct xhci_hcd *xhci, unsigned int trb_comp_code) @@ -1864,312 +2231,276 @@ int xhci_is_vendor_info_code(struct xhci_hcd *xhci, unsigned int trb_comp_code) return 0; } -/* - * Finish the td processing, remove the td from td list; - * Return 1 if the urb can be given back. - */ -static int finish_td(struct xhci_hcd *xhci, struct xhci_td *td, - union xhci_trb *event_trb, struct xhci_transfer_event *event, - struct xhci_virt_ep *ep, int *status, bool skip) +static void finish_td(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, + struct xhci_ring *ep_ring, struct xhci_td *td, + u32 trb_comp_code) { - struct xhci_virt_device *xdev; - struct xhci_ring *ep_ring; - unsigned int slot_id; - int ep_index; - struct urb *urb = NULL; struct xhci_ep_ctx *ep_ctx; - int ret = 0; - struct urb_priv *urb_priv; - u32 trb_comp_code; - - slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); - xdev = xhci->devs[slot_id]; - ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1; - ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); - ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); - trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); - if (skip) - goto td_cleanup; + ep_ctx = xhci_get_ep_ctx(xhci, ep->vdev->out_ctx, ep->ep_index); - if (trb_comp_code == COMP_STOP_INVAL || - trb_comp_code == COMP_STOP) { - /* The Endpoint Stop Command completion will take care of any - * stopped TDs. A stopped TD may be restarted, so don't update + switch (trb_comp_code) { + case COMP_STOPPED_LENGTH_INVALID: + case COMP_STOPPED_SHORT_PACKET: + case COMP_STOPPED: + /* + * The "Stop Endpoint" completion will take care of any + * stopped TDs. A stopped TD may be restarted, so don't update * the ring dequeue pointer or take this TD off any lists yet. */ - ep->stopped_td = td; - ep->stopped_trb = event_trb; - return 0; - } else { - if (trb_comp_code == COMP_STALL) { - /* The transfer is completed from the driver's - * perspective, but we need to issue a set dequeue - * command for this stalled endpoint to move the dequeue - * pointer past the TD. We can't do that here because - * the halt condition must be cleared first. Let the - * USB class driver clear the stall later. - */ - ep->stopped_td = td; - ep->stopped_trb = event_trb; - ep->stopped_stream = ep_ring->stream_id; - } else if (xhci_requires_manual_halt_cleanup(xhci, - ep_ctx, trb_comp_code)) { - /* Other types of errors halt the endpoint, but the - * class driver doesn't call usb_reset_endpoint() unless - * the error is -EPIPE. Clear the halted status in the - * xHCI hardware manually. - */ - xhci_cleanup_halted_endpoint(xhci, - slot_id, ep_index, ep_ring->stream_id, - td, event_trb); - } else { - /* Update ring dequeue pointer */ - while (ep_ring->dequeue != td->last_trb) - inc_deq(xhci, ep_ring); - inc_deq(xhci, ep_ring); - } - -td_cleanup: - /* Clean up the endpoint's TD list */ - urb = td->urb; - urb_priv = urb->hcpriv; + return; + } - /* Do one last check of the actual transfer length. - * If the host controller said we transferred more data than - * the buffer length, urb->actual_length will be a very big - * number (since it's unsigned). Play it safe and say we didn't - * transfer anything. + if (xhci_halted_host_endpoint(xhci, ep_ctx, trb_comp_code)) { + /* + * xhci internal endpoint state will go to a "halt" state for + * any stall, including default control pipe protocol stall. + * To clear the host side halt we need to issue a reset endpoint + * command, followed by a set dequeue command to move past the + * TD. + * Class drivers clear the device side halt from a functional + * stall later. Hub TT buffer should only be cleared for FS/LS + * devices behind HS hubs for functional stalls. */ - if (urb->actual_length > urb->transfer_buffer_length) { - xhci_warn(xhci, "URB transfer length is wrong, " - "xHC issue? req. len = %u, " - "act. len = %u\n", - urb->transfer_buffer_length, - urb->actual_length); - urb->actual_length = 0; - if (td->urb->transfer_flags & URB_SHORT_NOT_OK) - *status = -EREMOTEIO; - else - *status = 0; - } - list_del_init(&td->td_list); - /* Was this TD slated to be cancelled but completed anyway? */ - if (!list_empty(&td->cancelled_td_list)) - list_del_init(&td->cancelled_td_list); - - urb_priv->td_cnt++; - /* Giveback the urb when all the tds are completed */ - if (urb_priv->td_cnt == urb_priv->length) { - ret = 1; - if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { - xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--; - if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs - == 0) { - if (xhci->quirks & XHCI_AMD_PLL_FIX) - usb_amd_quirk_pll_enable(); - } - } - } + if (!(ep->ep_index == 0 && trb_comp_code == COMP_STALL_ERROR)) + xhci_clear_hub_tt_buffer(xhci, td, ep); + + xhci_handle_halted_endpoint(xhci, ep, td, EP_HARD_RESET); + + return; /* xhci_handle_halted_endpoint marked td cancelled */ } - return ret; + xhci_dequeue_td(xhci, td, ep_ring, td->status); +} + +/* sum trb lengths from the first trb up to stop_trb, _excluding_ stop_trb */ +static u32 sum_trb_lengths(struct xhci_td *td, union xhci_trb *stop_trb) +{ + u32 sum; + union xhci_trb *trb = td->start_trb; + struct xhci_segment *seg = td->start_seg; + + for (sum = 0; trb != stop_trb; next_trb(&seg, &trb)) { + if (!trb_is_noop(trb) && !trb_is_link(trb)) + sum += TRB_LEN(le32_to_cpu(trb->generic.field[2])); + } + return sum; } /* * Process control tds, update urb status and actual_length. */ -static int process_ctrl_td(struct xhci_hcd *xhci, struct xhci_td *td, - union xhci_trb *event_trb, struct xhci_transfer_event *event, - struct xhci_virt_ep *ep, int *status) +static void process_ctrl_td(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, + struct xhci_ring *ep_ring, struct xhci_td *td, + union xhci_trb *ep_trb, struct xhci_transfer_event *event) { - struct xhci_virt_device *xdev; - struct xhci_ring *ep_ring; - unsigned int slot_id; - int ep_index; struct xhci_ep_ctx *ep_ctx; u32 trb_comp_code; + u32 remaining, requested; + u32 trb_type; - slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); - xdev = xhci->devs[slot_id]; - ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1; - ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); - ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); + trb_type = TRB_FIELD_TO_TYPE(le32_to_cpu(ep_trb->generic.field[3])); + ep_ctx = xhci_get_ep_ctx(xhci, ep->vdev->out_ctx, ep->ep_index); trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); + requested = td->urb->transfer_buffer_length; + remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); switch (trb_comp_code) { case COMP_SUCCESS: - if (event_trb == ep_ring->dequeue) { - xhci_warn(xhci, "WARN: Success on ctrl setup TRB " - "without IOC set??\n"); - *status = -ESHUTDOWN; - } else if (event_trb != td->last_trb) { - xhci_warn(xhci, "WARN: Success on ctrl data TRB " - "without IOC set??\n"); - *status = -ESHUTDOWN; - } else { - *status = 0; + if (trb_type != TRB_STATUS) { + xhci_warn(xhci, "WARN: Success on ctrl %s TRB without IOC set?\n", + (trb_type == TRB_DATA) ? "data" : "setup"); + td->status = -ESHUTDOWN; + break; } + td->status = 0; break; - case COMP_SHORT_TX: - if (td->urb->transfer_flags & URB_SHORT_NOT_OK) - *status = -EREMOTEIO; - else - *status = 0; + case COMP_SHORT_PACKET: + td->status = 0; break; - case COMP_STOP_INVAL: - case COMP_STOP: - return finish_td(xhci, td, event_trb, event, ep, status, false); + case COMP_STOPPED_SHORT_PACKET: + if (trb_type == TRB_DATA || trb_type == TRB_NORMAL) + td->urb->actual_length = remaining; + else + xhci_warn(xhci, "WARN: Stopped Short Packet on ctrl setup or status TRB\n"); + goto finish_td; + case COMP_STOPPED: + switch (trb_type) { + case TRB_SETUP: + td->urb->actual_length = 0; + goto finish_td; + case TRB_DATA: + case TRB_NORMAL: + td->urb->actual_length = requested - remaining; + goto finish_td; + case TRB_STATUS: + td->urb->actual_length = requested; + goto finish_td; + default: + xhci_warn(xhci, "WARN: unexpected TRB Type %d\n", + trb_type); + goto finish_td; + } + case COMP_STOPPED_LENGTH_INVALID: + goto finish_td; default: - if (!xhci_requires_manual_halt_cleanup(xhci, - ep_ctx, trb_comp_code)) + if (!xhci_halted_host_endpoint(xhci, ep_ctx, trb_comp_code)) break; - xhci_dbg(xhci, "TRB error code %u, " - "halted endpoint index = %u\n", - trb_comp_code, ep_index); - /* else fall through */ - case COMP_STALL: + xhci_dbg(xhci, "TRB error %u, halted endpoint index = %u\n", + trb_comp_code, ep->ep_index); + fallthrough; + case COMP_STALL_ERROR: /* Did we transfer part of the data (middle) phase? */ - if (event_trb != ep_ring->dequeue && - event_trb != td->last_trb) - td->urb->actual_length = - td->urb->transfer_buffer_length - - EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); - else + if (trb_type == TRB_DATA || trb_type == TRB_NORMAL) + td->urb->actual_length = requested - remaining; + else if (!td->urb_length_set) td->urb->actual_length = 0; - - xhci_cleanup_halted_endpoint(xhci, - slot_id, ep_index, 0, td, event_trb); - return finish_td(xhci, td, event_trb, event, ep, status, true); + goto finish_td; } + + /* stopped at setup stage, no data transferred */ + if (trb_type == TRB_SETUP) + goto finish_td; + /* - * Did we transfer any data, despite the errors that might have - * happened? I.e. did we get past the setup stage? + * if on data stage then update the actual_length of the URB and flag it + * as set, so it won't be overwritten in the event for the last TRB. */ - if (event_trb != ep_ring->dequeue) { - /* The event was for the status stage */ - if (event_trb == td->last_trb) { - if (td->urb->actual_length != 0) { - /* Don't overwrite a previously set error code - */ - if ((*status == -EINPROGRESS || *status == 0) && - (td->urb->transfer_flags - & URB_SHORT_NOT_OK)) - /* Did we already see a short data - * stage? */ - *status = -EREMOTEIO; - } else { - td->urb->actual_length = - td->urb->transfer_buffer_length; - } - } else { - /* Maybe the event was for the data stage? */ - td->urb->actual_length = - td->urb->transfer_buffer_length - - EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); - xhci_dbg(xhci, "Waiting for status " - "stage event\n"); - return 0; - } + if (trb_type == TRB_DATA || + trb_type == TRB_NORMAL) { + td->urb_length_set = true; + td->urb->actual_length = requested - remaining; + xhci_dbg(xhci, "Waiting for status stage event\n"); + return; } - return finish_td(xhci, td, event_trb, event, ep, status, false); + /* at status stage */ + if (!td->urb_length_set) + td->urb->actual_length = requested; + +finish_td: + finish_td(xhci, ep, ep_ring, td, trb_comp_code); } /* * Process isochronous tds, update urb packet status and actual_length. */ -static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, - union xhci_trb *event_trb, struct xhci_transfer_event *event, - struct xhci_virt_ep *ep, int *status) +static void process_isoc_td(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, + struct xhci_ring *ep_ring, struct xhci_td *td, + union xhci_trb *ep_trb, struct xhci_transfer_event *event) { - struct xhci_ring *ep_ring; struct urb_priv *urb_priv; int idx; - int len = 0; - union xhci_trb *cur_trb; - struct xhci_segment *cur_seg; struct usb_iso_packet_descriptor *frame; u32 trb_comp_code; - bool skip_td = false; + bool sum_trbs_for_length = false; + u32 remaining, requested, ep_trb_len; + int short_framestatus; - ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); urb_priv = td->urb->hcpriv; - idx = urb_priv->td_cnt; + idx = urb_priv->num_tds_done; frame = &td->urb->iso_frame_desc[idx]; + requested = frame->length; + remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); + ep_trb_len = TRB_LEN(le32_to_cpu(ep_trb->generic.field[2])); + short_framestatus = td->urb->transfer_flags & URB_SHORT_NOT_OK ? + -EREMOTEIO : 0; /* handle completion code */ switch (trb_comp_code) { case COMP_SUCCESS: - if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) == 0) { - frame->status = 0; + /* Don't overwrite status if TD had an error, see xHCI 4.9.1 */ + if (td->error_mid_td) + break; + if (remaining) { + frame->status = short_framestatus; + sum_trbs_for_length = true; break; } - if ((xhci->quirks & XHCI_TRUST_TX_LENGTH)) - trb_comp_code = COMP_SHORT_TX; - case COMP_SHORT_TX: - frame->status = td->urb->transfer_flags & URB_SHORT_NOT_OK ? - -EREMOTEIO : 0; + frame->status = 0; + break; + case COMP_SHORT_PACKET: + frame->status = short_framestatus; + sum_trbs_for_length = true; break; - case COMP_BW_OVER: + case COMP_BANDWIDTH_OVERRUN_ERROR: frame->status = -ECOMM; - skip_td = true; break; - case COMP_BUFF_OVER: - case COMP_BABBLE: + case COMP_BABBLE_DETECTED_ERROR: + sum_trbs_for_length = true; + fallthrough; + case COMP_ISOCH_BUFFER_OVERRUN: frame->status = -EOVERFLOW; - skip_td = true; + if (ep_trb != td->end_trb) + td->error_mid_td = true; + break; + case COMP_MISSED_SERVICE_ERROR: + frame->status = -EXDEV; + sum_trbs_for_length = true; + if (ep_trb != td->end_trb) + td->error_mid_td = true; + break; + case COMP_INCOMPATIBLE_DEVICE_ERROR: + case COMP_STALL_ERROR: + frame->status = -EPROTO; break; - case COMP_DEV_ERR: - case COMP_STALL: - case COMP_TX_ERR: + case COMP_USB_TRANSACTION_ERROR: frame->status = -EPROTO; - skip_td = true; + sum_trbs_for_length = true; + if (ep_trb != td->end_trb) + td->error_mid_td = true; break; - case COMP_STOP: - case COMP_STOP_INVAL: + case COMP_STOPPED: + sum_trbs_for_length = true; + break; + case COMP_STOPPED_SHORT_PACKET: + /* field normally containing residue now contains transferred */ + frame->status = short_framestatus; + requested = remaining; + break; + case COMP_STOPPED_LENGTH_INVALID: + /* exclude stopped trb with invalid length from length sum */ + sum_trbs_for_length = true; + ep_trb_len = 0; + remaining = 0; break; default: + sum_trbs_for_length = true; frame->status = -1; break; } - if (trb_comp_code == COMP_SUCCESS || skip_td) { - frame->actual_length = frame->length; - td->urb->actual_length += frame->length; - } else { - for (cur_trb = ep_ring->dequeue, - cur_seg = ep_ring->deq_seg; cur_trb != event_trb; - next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { - if (!TRB_TYPE_NOOP_LE32(cur_trb->generic.field[3]) && - !TRB_TYPE_LINK_LE32(cur_trb->generic.field[3])) - len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])); - } - len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) - - EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); + if (td->urb_length_set) + goto finish_td; - if (trb_comp_code != COMP_STOP_INVAL) { - frame->actual_length = len; - td->urb->actual_length += len; - } - } + if (sum_trbs_for_length) + frame->actual_length = sum_trb_lengths(td, ep_trb) + + ep_trb_len - remaining; + else + frame->actual_length = requested; + + td->urb->actual_length += frame->actual_length; - return finish_td(xhci, td, event_trb, event, ep, status, false); +finish_td: + /* Don't give back TD yet if we encountered an error mid TD */ + if (td->error_mid_td && ep_trb != td->end_trb) { + xhci_dbg(xhci, "Error mid isoc TD, wait for final completion event\n"); + td->urb_length_set = true; + return; + } + finish_td(xhci, ep, ep_ring, td, trb_comp_code); } -static int skip_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, - struct xhci_transfer_event *event, - struct xhci_virt_ep *ep, int *status) +static void skip_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, + struct xhci_virt_ep *ep, int status) { - struct xhci_ring *ep_ring; struct urb_priv *urb_priv; struct usb_iso_packet_descriptor *frame; int idx; - ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); urb_priv = td->urb->hcpriv; - idx = urb_priv->td_cnt; + idx = urb_priv->num_tds_done; frame = &td->urb->iso_frame_desc[idx]; /* The transfer is partly done. */ @@ -2178,118 +2509,120 @@ static int skip_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, /* calc actual length */ frame->actual_length = 0; - /* Update ring dequeue pointer */ - while (ep_ring->dequeue != td->last_trb) - inc_deq(xhci, ep_ring); - inc_deq(xhci, ep_ring); - - return finish_td(xhci, td, NULL, event, ep, status, true); + xhci_dequeue_td(xhci, td, ep->ring, status); } /* * Process bulk and interrupt tds, update urb status and actual_length. */ -static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td, - union xhci_trb *event_trb, struct xhci_transfer_event *event, - struct xhci_virt_ep *ep, int *status) +static void process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, + struct xhci_ring *ep_ring, struct xhci_td *td, + union xhci_trb *ep_trb, struct xhci_transfer_event *event) { - struct xhci_ring *ep_ring; - union xhci_trb *cur_trb; - struct xhci_segment *cur_seg; + struct xhci_slot_ctx *slot_ctx; u32 trb_comp_code; + u32 remaining, requested, ep_trb_len; - ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); + slot_ctx = xhci_get_slot_ctx(xhci, ep->vdev->out_ctx); trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); + remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); + ep_trb_len = TRB_LEN(le32_to_cpu(ep_trb->generic.field[2])); + requested = td->urb->transfer_buffer_length; switch (trb_comp_code) { case COMP_SUCCESS: - /* Double check that the HW transferred everything. */ - if (event_trb != td->last_trb || - EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) { - xhci_warn(xhci, "WARN Successful completion " - "on short TX\n"); - if (td->urb->transfer_flags & URB_SHORT_NOT_OK) - *status = -EREMOTEIO; - else - *status = 0; - if ((xhci->quirks & XHCI_TRUST_TX_LENGTH)) - trb_comp_code = COMP_SHORT_TX; - } else { - *status = 0; + ep->err_count = 0; + /* handle success with untransferred data as short packet */ + if (ep_trb != td->end_trb || remaining) { + xhci_warn(xhci, "WARN Successful completion on short TX\n"); + xhci_dbg(xhci, "ep %#x - asked for %d bytes, %d bytes untransferred\n", + td->urb->ep->desc.bEndpointAddress, + requested, remaining); } + td->status = 0; break; - case COMP_SHORT_TX: - if (td->urb->transfer_flags & URB_SHORT_NOT_OK) - *status = -EREMOTEIO; - else - *status = 0; + case COMP_SHORT_PACKET: + td->status = 0; break; + case COMP_STOPPED_SHORT_PACKET: + td->urb->actual_length = remaining; + goto finish_td; + case COMP_STOPPED_LENGTH_INVALID: + /* stopped on ep trb with invalid length, exclude it */ + td->urb->actual_length = sum_trb_lengths(td, ep_trb); + goto finish_td; + case COMP_USB_TRANSACTION_ERROR: + if (xhci->quirks & XHCI_NO_SOFT_RETRY || + (ep->err_count++ > MAX_SOFT_RETRY) || + le32_to_cpu(slot_ctx->tt_info) & TT_SLOT) + break; + + td->status = 0; + + xhci_handle_halted_endpoint(xhci, ep, td, EP_SOFT_RESET); + return; default: - /* Others already handled above */ + /* do nothing */ break; } - if (trb_comp_code == COMP_SHORT_TX) - xhci_dbg(xhci, "ep %#x - asked for %d bytes, " - "%d bytes untransferred\n", - td->urb->ep->desc.bEndpointAddress, - td->urb->transfer_buffer_length, - EVENT_TRB_LEN(le32_to_cpu(event->transfer_len))); - /* Fast path - was this the last TRB in the TD for this URB? */ - if (event_trb == td->last_trb) { - if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) { - td->urb->actual_length = - td->urb->transfer_buffer_length - - EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); - if (td->urb->transfer_buffer_length < - td->urb->actual_length) { - xhci_warn(xhci, "HC gave bad length " - "of %d bytes left\n", - EVENT_TRB_LEN(le32_to_cpu(event->transfer_len))); - td->urb->actual_length = 0; - if (td->urb->transfer_flags & URB_SHORT_NOT_OK) - *status = -EREMOTEIO; - else - *status = 0; - } - /* Don't overwrite a previously set error code */ - if (*status == -EINPROGRESS) { - if (td->urb->transfer_flags & URB_SHORT_NOT_OK) - *status = -EREMOTEIO; - else - *status = 0; - } - } else { - td->urb->actual_length = - td->urb->transfer_buffer_length; - /* Ignore a short packet completion if the - * untransferred length was zero. - */ - if (*status == -EREMOTEIO) - *status = 0; - } - } else { - /* Slow path - walk the list, starting from the dequeue - * pointer, to get the actual length transferred. - */ + + if (ep_trb == td->end_trb) + td->urb->actual_length = requested - remaining; + else + td->urb->actual_length = + sum_trb_lengths(td, ep_trb) + + ep_trb_len - remaining; +finish_td: + if (remaining > requested) { + xhci_warn(xhci, "bad transfer trb length %d in event trb\n", + remaining); td->urb->actual_length = 0; - for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg; - cur_trb != event_trb; - next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { - if (!TRB_TYPE_NOOP_LE32(cur_trb->generic.field[3]) && - !TRB_TYPE_LINK_LE32(cur_trb->generic.field[3])) - td->urb->actual_length += - TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])); - } - /* If the ring didn't stop on a Link or No-op TRB, add - * in the actual bytes transferred from the Normal TRB - */ - if (trb_comp_code != COMP_STOP_INVAL) - td->urb->actual_length += - TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) - - EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); } - return finish_td(xhci, td, event_trb, event, ep, status, false); + finish_td(xhci, ep, ep_ring, td, trb_comp_code); +} + +/* Transfer events which don't point to a transfer TRB, see xhci 4.17.4 */ +static int handle_transferless_tx_event(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, + u32 trb_comp_code) +{ + switch (trb_comp_code) { + case COMP_STALL_ERROR: + case COMP_USB_TRANSACTION_ERROR: + case COMP_INVALID_STREAM_TYPE_ERROR: + case COMP_INVALID_STREAM_ID_ERROR: + xhci_dbg(xhci, "Stream transaction error ep %u no id\n", ep->ep_index); + if (ep->err_count++ > MAX_SOFT_RETRY) + xhci_handle_halted_endpoint(xhci, ep, NULL, EP_HARD_RESET); + else + xhci_handle_halted_endpoint(xhci, ep, NULL, EP_SOFT_RESET); + break; + case COMP_RING_UNDERRUN: + case COMP_RING_OVERRUN: + case COMP_STOPPED_LENGTH_INVALID: + break; + default: + xhci_err(xhci, "Transfer event %u for unknown stream ring slot %u ep %u\n", + trb_comp_code, ep->vdev->slot_id, ep->ep_index); + return -ENODEV; + } + return 0; +} + +static bool xhci_spurious_success_tx_event(struct xhci_hcd *xhci, + struct xhci_ring *ring) +{ + switch (ring->old_trb_comp_code) { + case COMP_SHORT_PACKET: + return xhci->quirks & XHCI_SPURIOUS_SUCCESS; + case COMP_USB_TRANSACTION_ERROR: + case COMP_BABBLE_DETECTED_ERROR: + case COMP_ISOCH_BUFFER_OVERRUN: + return xhci->quirks & XHCI_ETRON_HOST && + ring->type == TYPE_ISOC; + default: + return false; + } } /* @@ -2298,151 +2631,136 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td, * At this point, the host controller is probably hosed and should be reset. */ static int handle_tx_event(struct xhci_hcd *xhci, - struct xhci_transfer_event *event) - __releases(&xhci->lock) - __acquires(&xhci->lock) + struct xhci_interrupter *ir, + struct xhci_transfer_event *event) { - struct xhci_virt_device *xdev; struct xhci_virt_ep *ep; struct xhci_ring *ep_ring; unsigned int slot_id; int ep_index; struct xhci_td *td = NULL; - dma_addr_t event_dma; - struct xhci_segment *event_seg; - union xhci_trb *event_trb; - struct urb *urb = NULL; + dma_addr_t ep_trb_dma; + union xhci_trb *ep_trb; int status = -EINPROGRESS; - struct urb_priv *urb_priv; struct xhci_ep_ctx *ep_ctx; - struct list_head *tmp; u32 trb_comp_code; - int ret = 0; - int td_num = 0; + bool ring_xrun_event = false; slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); - xdev = xhci->devs[slot_id]; - if (!xdev) { - xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n"); - xhci_err(xhci, "@%016llx %08x %08x %08x %08x\n", - (unsigned long long) xhci_trb_virt_to_dma( - xhci->event_ring->deq_seg, - xhci->event_ring->dequeue), - lower_32_bits(le64_to_cpu(event->buffer)), - upper_32_bits(le64_to_cpu(event->buffer)), - le32_to_cpu(event->transfer_len), - le32_to_cpu(event->flags)); - xhci_dbg(xhci, "Event ring:\n"); - xhci_debug_segment(xhci, xhci->event_ring->deq_seg); - return -ENODEV; - } - - /* Endpoint ID is 1 based, our index is zero based */ ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1; - ep = &xdev->eps[ep_index]; - ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); - ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); - if (!ep_ring || - (le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK) == - EP_STATE_DISABLED) { - xhci_err(xhci, "ERROR Transfer event for disabled endpoint " - "or incorrect stream ring\n"); - xhci_err(xhci, "@%016llx %08x %08x %08x %08x\n", - (unsigned long long) xhci_trb_virt_to_dma( - xhci->event_ring->deq_seg, - xhci->event_ring->dequeue), - lower_32_bits(le64_to_cpu(event->buffer)), - upper_32_bits(le64_to_cpu(event->buffer)), - le32_to_cpu(event->transfer_len), - le32_to_cpu(event->flags)); - xhci_dbg(xhci, "Event ring:\n"); - xhci_debug_segment(xhci, xhci->event_ring->deq_seg); - return -ENODEV; + trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); + ep_trb_dma = le64_to_cpu(event->buffer); + + ep = xhci_get_virt_ep(xhci, slot_id, ep_index); + if (!ep) { + xhci_err(xhci, "ERROR Invalid Transfer event\n"); + goto err_out; } - /* Count current td numbers if ep->skip is set */ - if (ep->skip) { - list_for_each(tmp, &ep_ring->td_list) - td_num++; + ep_ring = xhci_dma_to_transfer_ring(ep, ep_trb_dma); + ep_ctx = xhci_get_ep_ctx(xhci, ep->vdev->out_ctx, ep_index); + + if (GET_EP_CTX_STATE(ep_ctx) == EP_STATE_DISABLED) { + xhci_err(xhci, + "ERROR Transfer event for disabled endpoint slot %u ep %u\n", + slot_id, ep_index); + goto err_out; } - event_dma = le64_to_cpu(event->buffer); - trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); + if (!ep_ring) + return handle_transferless_tx_event(xhci, ep, trb_comp_code); + + /* find the transfer trb this events points to */ + ep_trb = xhci_dma_to_trb(ep_ring->deq_seg, ep_trb_dma, NULL); + /* Look for common error cases */ switch (trb_comp_code) { /* Skip codes that require special handling depending on * transfer type */ case COMP_SUCCESS: - if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) == 0) - break; - if (xhci->quirks & XHCI_TRUST_TX_LENGTH) - trb_comp_code = COMP_SHORT_TX; - else - xhci_warn_ratelimited(xhci, - "WARN Successful completion on short TX: needs XHCI_TRUST_TX_LENGTH quirk?\n"); - case COMP_SHORT_TX: + if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) { + trb_comp_code = COMP_SHORT_PACKET; + xhci_dbg(xhci, "Successful completion on short TX for slot %u ep %u with last td comp code %d\n", + slot_id, ep_index, ep_ring->old_trb_comp_code); + } + break; + case COMP_SHORT_PACKET: + break; + /* Completion codes for endpoint stopped state */ + case COMP_STOPPED: + xhci_dbg(xhci, "Stopped on Transfer TRB for slot %u ep %u\n", + slot_id, ep_index); break; - case COMP_STOP: - xhci_dbg(xhci, "Stopped on Transfer TRB\n"); + case COMP_STOPPED_LENGTH_INVALID: + xhci_dbg(xhci, + "Stopped on No-op or Link TRB for slot %u ep %u\n", + slot_id, ep_index); break; - case COMP_STOP_INVAL: - xhci_dbg(xhci, "Stopped on No-op or Link TRB\n"); + case COMP_STOPPED_SHORT_PACKET: + xhci_dbg(xhci, + "Stopped with short packet transfer detected for slot %u ep %u\n", + slot_id, ep_index); break; - case COMP_STALL: - xhci_dbg(xhci, "Stalled endpoint\n"); - ep->ep_state |= EP_HALTED; + /* Completion codes for endpoint halted state */ + case COMP_STALL_ERROR: + xhci_dbg(xhci, "Stalled endpoint for slot %u ep %u\n", slot_id, + ep_index); status = -EPIPE; break; - case COMP_TRB_ERR: - xhci_warn(xhci, "WARN: TRB error on endpoint\n"); - status = -EILSEQ; + case COMP_SPLIT_TRANSACTION_ERROR: + xhci_dbg(xhci, "Split transaction error for slot %u ep %u\n", + slot_id, ep_index); + status = -EPROTO; break; - case COMP_SPLIT_ERR: - case COMP_TX_ERR: - xhci_dbg(xhci, "Transfer error on endpoint\n"); + case COMP_USB_TRANSACTION_ERROR: + xhci_dbg(xhci, "Transfer error for slot %u ep %u on endpoint\n", + slot_id, ep_index); status = -EPROTO; break; - case COMP_BABBLE: - xhci_dbg(xhci, "Babble error on endpoint\n"); + case COMP_BABBLE_DETECTED_ERROR: + xhci_dbg(xhci, "Babble error for slot %u ep %u on endpoint\n", + slot_id, ep_index); status = -EOVERFLOW; break; - case COMP_DB_ERR: - xhci_warn(xhci, "WARN: HC couldn't access mem fast enough\n"); + /* Completion codes for endpoint error state */ + case COMP_TRB_ERROR: + xhci_warn(xhci, + "WARN: TRB error for slot %u ep %u on endpoint\n", + slot_id, ep_index); + status = -EILSEQ; + break; + /* completion codes not indicating endpoint state change */ + case COMP_DATA_BUFFER_ERROR: + xhci_warn(xhci, + "WARN: HC couldn't access mem fast enough for slot %u ep %u\n", + slot_id, ep_index); status = -ENOSR; break; - case COMP_BW_OVER: - xhci_warn(xhci, "WARN: bandwidth overrun event on endpoint\n"); + case COMP_BANDWIDTH_OVERRUN_ERROR: + xhci_warn(xhci, + "WARN: bandwidth overrun event for slot %u ep %u on endpoint\n", + slot_id, ep_index); break; - case COMP_BUFF_OVER: - xhci_warn(xhci, "WARN: buffer overrun event on endpoint\n"); + case COMP_ISOCH_BUFFER_OVERRUN: + xhci_warn(xhci, + "WARN: buffer overrun event for slot %u ep %u on endpoint", + slot_id, ep_index); break; - case COMP_UNDERRUN: + case COMP_RING_UNDERRUN: /* * When the Isoch ring is empty, the xHC will generate * a Ring Overrun Event for IN Isoch endpoint or Ring * Underrun Event for OUT Isoch endpoint. */ - xhci_dbg(xhci, "underrun event on endpoint\n"); - if (!list_empty(&ep_ring->td_list)) - xhci_dbg(xhci, "Underrun Event for slot %d ep %d " - "still with TDs queued?\n", - TRB_TO_SLOT_ID(le32_to_cpu(event->flags)), - ep_index); - goto cleanup; - case COMP_OVERRUN: - xhci_dbg(xhci, "overrun event on endpoint\n"); - if (!list_empty(&ep_ring->td_list)) - xhci_dbg(xhci, "Overrun Event for slot %d ep %d " - "still with TDs queued?\n", - TRB_TO_SLOT_ID(le32_to_cpu(event->flags)), - ep_index); - goto cleanup; - case COMP_DEV_ERR: - xhci_warn(xhci, "WARN: detect an incompatible device"); - status = -EPROTO; + xhci_dbg(xhci, "Underrun event on slot %u ep %u\n", slot_id, ep_index); + ring_xrun_event = true; + break; + case COMP_RING_OVERRUN: + xhci_dbg(xhci, "Overrun event on slot %u ep %u\n", slot_id, ep_index); + ring_xrun_event = true; break; - case COMP_MISSED_INT: + case COMP_MISSED_SERVICE_ERROR: /* * When encounter missed service error, one or more isoc tds * may be missed by xHC. @@ -2450,180 +2768,152 @@ static int handle_tx_event(struct xhci_hcd *xhci, * short transfer when process the ep_ring next time. */ ep->skip = true; - xhci_dbg(xhci, "Miss service interval error, set skip flag\n"); - goto cleanup; + xhci_dbg(xhci, + "Miss service interval error for slot %u ep %u, set skip flag%s\n", + slot_id, ep_index, ep_trb_dma ? ", skip now" : ""); + break; + case COMP_NO_PING_RESPONSE_ERROR: + ep->skip = true; + xhci_dbg(xhci, + "No Ping response error for slot %u ep %u, Skip one Isoc TD\n", + slot_id, ep_index); + return 0; + + case COMP_INCOMPATIBLE_DEVICE_ERROR: + /* needs disable slot command to recover */ + xhci_warn(xhci, + "WARN: detect an incompatible device for slot %u ep %u", + slot_id, ep_index); + status = -EPROTO; + break; default: if (xhci_is_vendor_info_code(xhci, trb_comp_code)) { status = 0; break; } - xhci_warn(xhci, "ERROR Unknown event condition, HC probably " - "busted\n"); - goto cleanup; + xhci_warn(xhci, + "ERROR Unknown event condition %u for slot %u ep %u , HC probably busted\n", + trb_comp_code, slot_id, ep_index); + if (ep->skip) + break; + return 0; } - do { - /* This TRB should be in the TD at the head of this ring's - * TD list. - */ - if (list_empty(&ep_ring->td_list)) { - /* - * A stopped endpoint may generate an extra completion - * event if the device was suspended. Don't print - * warnings. - */ - if (!(trb_comp_code == COMP_STOP || - trb_comp_code == COMP_STOP_INVAL)) { - xhci_warn(xhci, "WARN Event TRB for slot %d ep %d with no TDs queued?\n", - TRB_TO_SLOT_ID(le32_to_cpu(event->flags)), - ep_index); - xhci_dbg(xhci, "Event TRB with TRB type ID %u\n", - (le32_to_cpu(event->flags) & - TRB_TYPE_BITMASK)>>10); - xhci_print_trb_offsets(xhci, (union xhci_trb *) event); - } - if (ep->skip) { - ep->skip = false; - xhci_dbg(xhci, "td_list is empty while skip " - "flag set. Clear skip flag.\n"); - } - ret = 0; - goto cleanup; - } - - /* We've skipped all the TDs on the ep ring when ep->skip set */ - if (ep->skip && td_num == 0) { - ep->skip = false; - xhci_dbg(xhci, "All tds on the ep_ring skipped. " - "Clear skip flag.\n"); - ret = 0; - goto cleanup; - } + /* + * xhci 4.10.2 states isoc endpoints should continue + * processing the next TD if there was an error mid TD. + * So host like NEC don't generate an event for the last + * isoc TRB even if the IOC flag is set. + * xhci 4.9.1 states that if there are errors in mult-TRB + * TDs xHC should generate an error for that TRB, and if xHC + * proceeds to the next TD it should genete an event for + * any TRB with IOC flag on the way. Other host follow this. + * + * We wait for the final IOC event, but if we get an event + * anywhere outside this TD, just give it back already. + */ + td = list_first_entry_or_null(&ep_ring->td_list, struct xhci_td, td_list); - td = list_entry(ep_ring->td_list.next, struct xhci_td, td_list); - if (ep->skip) - td_num--; + if (td && td->error_mid_td && !trb_in_td(td, ep_trb_dma)) { + xhci_dbg(xhci, "Missing TD completion event after mid TD error\n"); + xhci_dequeue_td(xhci, td, ep_ring, td->status); + } - /* Is this a TRB in the currently executing TD? */ - event_seg = trb_in_td(ep_ring->deq_seg, ep_ring->dequeue, - td->last_trb, event_dma); + /* If the TRB pointer is NULL, missed TDs will be skipped on the next event */ + if (trb_comp_code == COMP_MISSED_SERVICE_ERROR && !ep_trb_dma) + return 0; + if (list_empty(&ep_ring->td_list)) { /* - * Skip the Force Stopped Event. The event_trb(event_dma) of FSE - * is not in the current TD pointed by ep_ring->dequeue because - * that the hardware dequeue pointer still at the previous TRB - * of the current TD. The previous TRB maybe a Link TD or the - * last TRB of the previous TD. The command completion handle - * will take care the rest. + * Don't print wanings if ring is empty due to a stopped endpoint generating an + * extra completion event if the device was suspended. Or, a event for the last TRB + * of a short TD we already got a short event for. The short TD is already removed + * from the TD list. */ - if (!event_seg && trb_comp_code == COMP_STOP_INVAL) { - ret = 0; - goto cleanup; + if (trb_comp_code != COMP_STOPPED && + trb_comp_code != COMP_STOPPED_LENGTH_INVALID && + !ring_xrun_event && + !xhci_spurious_success_tx_event(xhci, ep_ring)) { + xhci_warn(xhci, "Event TRB for slot %u ep %u with no TDs queued\n", + slot_id, ep_index); } - if (!event_seg) { - if (!ep->skip || - !usb_endpoint_xfer_isoc(&td->urb->ep->desc)) { - /* Some host controllers give a spurious - * successful event after a short transfer. - * Ignore it. - */ - if ((xhci->quirks & XHCI_SPURIOUS_SUCCESS) && - ep_ring->last_td_was_short) { - ep_ring->last_td_was_short = false; - ret = 0; - goto cleanup; + ep->skip = false; + goto check_endpoint_halted; + } + + do { + td = list_first_entry(&ep_ring->td_list, struct xhci_td, + td_list); + + /* Is this TRB not part of the currently executing TD? */ + if (!trb_in_td(td, ep_trb_dma)) { + + if (ep->skip && usb_endpoint_xfer_isoc(&td->urb->ep->desc)) { + /* this event is unlikely to match any TD, don't skip them all */ + if (trb_comp_code == COMP_STOPPED_LENGTH_INVALID) + return 0; + + skip_isoc_td(xhci, td, ep, status); + + if (!list_empty(&ep_ring->td_list)) { + if (ring_xrun_event) { + /* + * If we are here, we are on xHCI 1.0 host with no + * idea how many TDs were missed or where the xrun + * occurred. New TDs may have been added after the + * xrun, so skip only one TD to be safe. + */ + xhci_dbg(xhci, "Skipped one TD for slot %u ep %u", + slot_id, ep_index); + return 0; + } + continue; } - /* HC is busted, give up! */ - xhci_err(xhci, - "ERROR Transfer event TRB DMA ptr not " - "part of current TD\n"); - return -ESHUTDOWN; + + xhci_dbg(xhci, "All TDs skipped for slot %u ep %u. Clear skip flag.\n", + slot_id, ep_index); + ep->skip = false; + td = NULL; + goto check_endpoint_halted; } - ret = skip_isoc_td(xhci, td, event, ep, &status); - goto cleanup; - } - if (trb_comp_code == COMP_SHORT_TX) - ep_ring->last_td_was_short = true; - else - ep_ring->last_td_was_short = false; + /* TD was queued after xrun, maybe xrun was on a link, don't panic yet */ + if (ring_xrun_event) + return 0; - if (ep->skip) { - xhci_dbg(xhci, "Found td. Clear skip flag.\n"); - ep->skip = false; - } - - event_trb = &event_seg->trbs[(event_dma - event_seg->dma) / - sizeof(*event_trb)]; - /* - * No-op TRB should not trigger interrupts. - * If event_trb is a no-op TRB, it means the - * corresponding TD has been cancelled. Just ignore - * the TD. - */ - if (TRB_TYPE_NOOP_LE32(event_trb->generic.field[3])) { - xhci_dbg(xhci, - "event_trb is a no-op TRB. Skip it\n"); - goto cleanup; - } + /* + * Skip the Force Stopped Event. The 'ep_trb' of FSE is not in the current + * TD pointed by 'ep_ring->dequeue' because that the hardware dequeue + * pointer still at the previous TRB of the current TD. The previous TRB + * maybe a Link TD or the last TRB of the previous TD. The command + * completion handle will take care the rest. + */ + if (trb_comp_code == COMP_STOPPED || + trb_comp_code == COMP_STOPPED_LENGTH_INVALID) { + return 0; + } - /* Now update the urb's actual_length and give back to - * the core - */ - if (usb_endpoint_xfer_control(&td->urb->ep->desc)) - ret = process_ctrl_td(xhci, td, event_trb, event, ep, - &status); - else if (usb_endpoint_xfer_isoc(&td->urb->ep->desc)) - ret = process_isoc_td(xhci, td, event_trb, event, ep, - &status); - else - ret = process_bulk_intr_td(xhci, td, event_trb, event, - ep, &status); + /* + * Some hosts give a spurious success event after a short + * transfer or error on last TRB. Ignore it. + */ + if (xhci_spurious_success_tx_event(xhci, ep_ring)) { + xhci_dbg(xhci, "Spurious event dma %pad, comp_code %u after %u\n", + &ep_trb_dma, trb_comp_code, ep_ring->old_trb_comp_code); + ep_ring->old_trb_comp_code = 0; + return 0; + } -cleanup: - /* - * Do not update event ring dequeue pointer if ep->skip is set. - * Will roll back to continue process missed tds. - */ - if (trb_comp_code == COMP_MISSED_INT || !ep->skip) { - inc_deq(xhci, xhci->event_ring); + /* HC is busted, give up! */ + goto debug_finding_td; } - if (ret) { - urb = td->urb; - urb_priv = urb->hcpriv; - /* Leave the TD around for the reset endpoint function - * to use(but only if it's not a control endpoint, - * since we already queued the Set TR dequeue pointer - * command for stalled control endpoints). - */ - if (usb_endpoint_xfer_control(&urb->ep->desc) || - (trb_comp_code != COMP_STALL && - trb_comp_code != COMP_BABBLE)) - xhci_urb_free_priv(xhci, urb_priv); - else - kfree(urb_priv); - - usb_hcd_unlink_urb_from_ep(bus_to_hcd(urb->dev->bus), urb); - if ((urb->actual_length != urb->transfer_buffer_length && - (urb->transfer_flags & - URB_SHORT_NOT_OK)) || - (status != 0 && - !usb_endpoint_xfer_isoc(&urb->ep->desc))) - xhci_dbg(xhci, "Giveback URB %p, len = %d, " - "expected = %d, status = %d\n", - urb, urb->actual_length, - urb->transfer_buffer_length, - status); - spin_unlock(&xhci->lock); - /* EHCI, UHCI, and OHCI always unconditionally set the - * urb->status of an isochronous endpoint to 0. - */ - if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) - status = 0; - usb_hcd_giveback_urb(bus_to_hcd(urb->dev->bus), urb, status); - spin_lock(&xhci->lock); + if (ep->skip) { + xhci_dbg(xhci, + "Found td. Clear skip flag for slot %u ep %u.\n", + slot_id, ep_index); + ep->skip = false; } /* @@ -2632,84 +2922,251 @@ cleanup: * Process them as short transfer until reach the td pointed by * the event. */ - } while (ep->skip && trb_comp_code != COMP_MISSED_INT); + } while (ep->skip); + + ep_ring->old_trb_comp_code = trb_comp_code; + + /* Get out if a TD was queued at enqueue after the xrun occurred */ + if (ring_xrun_event) + return 0; + + trace_xhci_handle_transfer(ep_ring, (struct xhci_generic_trb *) ep_trb, ep_trb_dma); + + /* + * No-op TRB could trigger interrupts in a case where a URB was killed + * and a STALL_ERROR happens right after the endpoint ring stopped. + * Reset the halted endpoint. Otherwise, the endpoint remains stalled + * indefinitely. + */ + + if (trb_is_noop(ep_trb)) + goto check_endpoint_halted; + + td->status = status; + + /* update the urb's actual_length and give back to the core */ + if (usb_endpoint_xfer_control(&td->urb->ep->desc)) + process_ctrl_td(xhci, ep, ep_ring, td, ep_trb, event); + else if (usb_endpoint_xfer_isoc(&td->urb->ep->desc)) + process_isoc_td(xhci, ep, ep_ring, td, ep_trb, event); + else + process_bulk_intr_td(xhci, ep, ep_ring, td, ep_trb, event); + return 0; + +check_endpoint_halted: + if (xhci_halted_host_endpoint(xhci, ep_ctx, trb_comp_code)) + xhci_handle_halted_endpoint(xhci, ep, td, EP_HARD_RESET); return 0; + +debug_finding_td: + xhci_err(xhci, "Event dma %pad for ep %d status %d not part of TD at %016llx - %016llx\n", + &ep_trb_dma, ep_index, trb_comp_code, + (unsigned long long)xhci_trb_virt_to_dma(td->start_seg, td->start_trb), + (unsigned long long)xhci_trb_virt_to_dma(td->end_seg, td->end_trb)); + + return -ESHUTDOWN; + +err_out: + xhci_err(xhci, "@%016llx %08x %08x %08x %08x\n", + (unsigned long long) xhci_trb_virt_to_dma( + ir->event_ring->deq_seg, + ir->event_ring->dequeue), + lower_32_bits(le64_to_cpu(event->buffer)), + upper_32_bits(le64_to_cpu(event->buffer)), + le32_to_cpu(event->transfer_len), + le32_to_cpu(event->flags)); + return -ENODEV; } /* - * This function handles all OS-owned events on the event ring. It may drop + * This function handles one OS-owned event on the event ring. It may drop * xhci->lock between event processing (e.g. to pass up port status changes). - * Returns >0 for "possibly more events to process" (caller should call again), - * otherwise 0 if done. In future, <0 returns should indicate error code. */ -static int xhci_handle_event(struct xhci_hcd *xhci) +static int xhci_handle_event_trb(struct xhci_hcd *xhci, struct xhci_interrupter *ir, + union xhci_trb *event) { - union xhci_trb *event; - int update_ptrs = 1; - int ret; + u32 trb_type; - if (!xhci->event_ring || !xhci->event_ring->dequeue) { - xhci->error_bitmask |= 1 << 1; - return 0; - } - - event = xhci->event_ring->dequeue; - /* Does the HC or OS own the TRB? */ - if ((le32_to_cpu(event->event_cmd.flags) & TRB_CYCLE) != - xhci->event_ring->cycle_state) { - xhci->error_bitmask |= 1 << 2; - return 0; - } + trace_xhci_handle_event(ir->event_ring, &event->generic, + xhci_trb_virt_to_dma(ir->event_ring->deq_seg, + ir->event_ring->dequeue)); /* - * Barrier between reading the TRB_CYCLE (valid) flag above and any + * Barrier between reading the TRB_CYCLE (valid) flag before, and any * speculative reads of the event's flags/data below. */ rmb(); + trb_type = TRB_FIELD_TO_TYPE(le32_to_cpu(event->event_cmd.flags)); /* FIXME: Handle more event types. */ - switch ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK)) { - case TRB_TYPE(TRB_COMPLETION): + + switch (trb_type) { + case TRB_COMPLETION: handle_cmd_completion(xhci, &event->event_cmd); break; - case TRB_TYPE(TRB_PORT_STATUS): + case TRB_PORT_STATUS: handle_port_status(xhci, event); - update_ptrs = 0; break; - case TRB_TYPE(TRB_TRANSFER): - ret = handle_tx_event(xhci, &event->trans_event); - if (ret < 0) - xhci->error_bitmask |= 1 << 9; - else - update_ptrs = 0; + case TRB_TRANSFER: + handle_tx_event(xhci, ir, &event->trans_event); break; - case TRB_TYPE(TRB_DEV_NOTE): + case TRB_DEV_NOTE: handle_device_notification(xhci, event); break; default: - if ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK) >= - TRB_TYPE(48)) - handle_vendor_event(xhci, event); + if (trb_type >= TRB_VENDOR_DEFINED_LOW) + handle_vendor_event(xhci, event, trb_type); else - xhci->error_bitmask |= 1 << 3; + xhci_warn(xhci, "ERROR unknown event type %d\n", trb_type); } /* Any of the above functions may drop and re-acquire the lock, so check * to make sure a watchdog timer didn't mark the host as non-responsive. */ if (xhci->xhc_state & XHCI_STATE_DYING) { - xhci_dbg(xhci, "xHCI host dying, returning from " - "event handler.\n"); - return 0; + xhci_dbg(xhci, "xHCI host dying, returning from event handler.\n"); + return -ENODEV; } - if (update_ptrs) - /* Update SW event ring dequeue pointer */ - inc_deq(xhci, xhci->event_ring); + return 0; +} - /* Are there more items on the event ring? Caller will call us again to - * check. +/* + * Update Event Ring Dequeue Pointer: + * - When all events have finished + * - To avoid "Event Ring Full Error" condition + */ +void xhci_update_erst_dequeue(struct xhci_hcd *xhci, + struct xhci_interrupter *ir, + bool clear_ehb) +{ + u64 temp_64; + dma_addr_t deq; + + temp_64 = xhci_read_64(xhci, &ir->ir_set->erst_dequeue); + deq = xhci_trb_virt_to_dma(ir->event_ring->deq_seg, + ir->event_ring->dequeue); + if (deq == 0) + xhci_warn(xhci, "WARN something wrong with SW event ring dequeue ptr\n"); + /* + * Per 4.9.4, Software writes to the ERDP register shall always advance + * the Event Ring Dequeue Pointer value. */ - return 1; + if ((temp_64 & ERST_PTR_MASK) == (deq & ERST_PTR_MASK) && !clear_ehb) + return; + + /* Update HC event ring dequeue pointer */ + temp_64 = ir->event_ring->deq_seg->num & ERST_DESI_MASK; + temp_64 |= deq & ERST_PTR_MASK; + + /* Clear the event handler busy flag (RW1C) */ + if (clear_ehb) + temp_64 |= ERST_EHB; + xhci_write_64(xhci, temp_64, &ir->ir_set->erst_dequeue); +} + +/* Clear the interrupt pending bit for a specific interrupter. */ +static void xhci_clear_interrupt_pending(struct xhci_interrupter *ir) +{ + if (!ir->ip_autoclear) { + u32 iman; + + iman = readl(&ir->ir_set->iman); + iman |= IMAN_IP; + writel(iman, &ir->ir_set->iman); + + /* Read operation to guarantee the write has been flushed from posted buffers */ + readl(&ir->ir_set->iman); + } +} + +/* + * Handle all OS-owned events on an interrupter event ring. It may drop + * and reaquire xhci->lock between event processing. + */ +static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir, + bool skip_events) +{ + int event_loop = 0; + int err = 0; + u64 temp; + + xhci_clear_interrupt_pending(ir); + + /* Event ring hasn't been allocated yet. */ + if (!ir->event_ring || !ir->event_ring->dequeue) { + xhci_err(xhci, "ERROR interrupter event ring not ready\n"); + return -ENOMEM; + } + + if (xhci->xhc_state & XHCI_STATE_DYING || + xhci->xhc_state & XHCI_STATE_HALTED) { + xhci_dbg(xhci, "xHCI dying, ignoring interrupt. Shouldn't IRQs be disabled?\n"); + + /* Clear the event handler busy flag (RW1C) */ + temp = xhci_read_64(xhci, &ir->ir_set->erst_dequeue); + xhci_write_64(xhci, temp | ERST_EHB, &ir->ir_set->erst_dequeue); + return -ENODEV; + } + + /* Process all OS owned event TRBs on this event ring */ + while (unhandled_event_trb(ir->event_ring)) { + if (!skip_events) + err = xhci_handle_event_trb(xhci, ir, ir->event_ring->dequeue); + + /* + * If half a segment of events have been handled in one go then + * update ERDP, and force isoc trbs to interrupt more often + */ + if (event_loop++ > TRBS_PER_SEGMENT / 2) { + xhci_update_erst_dequeue(xhci, ir, false); + + if (ir->isoc_bei_interval > AVOID_BEI_INTERVAL_MIN) + ir->isoc_bei_interval = ir->isoc_bei_interval / 2; + + event_loop = 0; + } + + /* Update SW event ring dequeue pointer */ + inc_deq(xhci, ir->event_ring); + + if (err) + break; + } + + xhci_update_erst_dequeue(xhci, ir, true); + + return 0; +} + +/* + * Move the event ring dequeue pointer to skip events kept in the secondary + * event ring. This is used to ensure that pending events in the ring are + * acknowledged, so the xHCI HCD can properly enter suspend/resume. The + * secondary ring is typically maintained by an external component. + */ +void xhci_skip_sec_intr_events(struct xhci_hcd *xhci, + struct xhci_ring *ring, struct xhci_interrupter *ir) +{ + union xhci_trb *current_trb; + u64 erdp_reg; + dma_addr_t deq; + + /* disable irq, ack pending interrupt and ack all pending events */ + xhci_disable_interrupter(xhci, ir); + + /* last acked event trb is in erdp reg */ + erdp_reg = xhci_read_64(xhci, &ir->ir_set->erst_dequeue); + deq = (dma_addr_t)(erdp_reg & ERST_PTR_MASK); + if (!deq) { + xhci_err(xhci, "event ring handling not required\n"); + return; + } + + current_trb = ir->event_ring->dequeue; + /* read cycle state of the last acked trb to find out CCS */ + ring->cycle_state = le32_to_cpu(current_trb->event_cmd.flags) & TRB_CYCLE; + + xhci_handle_events(xhci, ir, true); } /* @@ -2720,27 +3177,31 @@ static int xhci_handle_event(struct xhci_hcd *xhci) irqreturn_t xhci_irq(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); + irqreturn_t ret = IRQ_HANDLED; u32 status; - u64 temp_64; - union xhci_trb *event_ring_deq; - dma_addr_t deq; spin_lock(&xhci->lock); /* Check if the xHC generated the interrupt, or the irq is shared */ - status = xhci_readl(xhci, &xhci->op_regs->status); - if (status == 0xffffffff) - goto hw_died; + status = readl(&xhci->op_regs->status); + if (status == ~(u32)0) { + xhci_hc_died(xhci); + goto out; + } if (!(status & STS_EINT)) { - spin_unlock(&xhci->lock); - return IRQ_NONE; + ret = IRQ_NONE; + goto out; + } + + if (status & STS_HCE) { + xhci_warn(xhci, "WARNING: Host Controller Error\n"); + goto out; } + if (status & STS_FATAL) { xhci_warn(xhci, "WARNING: Host System Error\n"); xhci_halt(xhci); -hw_died: - spin_unlock(&xhci->lock); - return -ESHUTDOWN; + goto out; } /* @@ -2749,64 +3210,21 @@ hw_died: * Write 1 to clear the interrupt status. */ status |= STS_EINT; - xhci_writel(xhci, status, &xhci->op_regs->status); - /* FIXME when MSI-X is supported and there are multiple vectors */ - /* Clear the MSI-X event interrupt status */ - - if (hcd->irq) { - u32 irq_pending; - /* Acknowledge the PCI interrupt */ - irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending); - irq_pending |= IMAN_IP; - xhci_writel(xhci, irq_pending, &xhci->ir_set->irq_pending); - } - - if (xhci->xhc_state & XHCI_STATE_DYING) { - xhci_dbg(xhci, "xHCI dying, ignoring interrupt. " - "Shouldn't IRQs be disabled?\n"); - /* Clear the event handler busy flag (RW1C); - * the event ring should be empty. - */ - temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); - xhci_write_64(xhci, temp_64 | ERST_EHB, - &xhci->ir_set->erst_dequeue); - spin_unlock(&xhci->lock); - - return IRQ_HANDLED; - } - - event_ring_deq = xhci->event_ring->dequeue; - /* FIXME this should be a delayed service routine - * that clears the EHB. - */ - while (xhci_handle_event(xhci) > 0) {} - - temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); - /* If necessary, update the HW's version of the event ring deq ptr. */ - if (event_ring_deq != xhci->event_ring->dequeue) { - deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, - xhci->event_ring->dequeue); - if (deq == 0) - xhci_warn(xhci, "WARN something wrong with SW event " - "ring dequeue ptr.\n"); - /* Update HC event ring dequeue pointer */ - temp_64 &= ERST_PTR_MASK; - temp_64 |= ((u64) deq & (u64) ~ERST_PTR_MASK); - } - - /* Clear the event handler busy flag (RW1C); event ring is empty. */ - temp_64 |= ERST_EHB; - xhci_write_64(xhci, temp_64, &xhci->ir_set->erst_dequeue); + writel(status, &xhci->op_regs->status); + /* This is the handler of the primary interrupter */ + xhci_handle_events(xhci, xhci->interrupters[0], false); +out: spin_unlock(&xhci->lock); - return IRQ_HANDLED; + return ret; } irqreturn_t xhci_msi_irq(int irq, void *hcd) { return xhci_irq(hcd); } +EXPORT_SYMBOL_GPL(xhci_msi_irq); /**** Endpoint Ring Operations ****/ @@ -2827,18 +3245,24 @@ static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, trb->field[0] = cpu_to_le32(field1); trb->field[1] = cpu_to_le32(field2); trb->field[2] = cpu_to_le32(field3); + /* make sure TRB is fully written before giving it to the controller */ + wmb(); trb->field[3] = cpu_to_le32(field4); + + trace_xhci_queue_trb(ring, trb, + xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue)); + inc_enq(xhci, ring, more_trbs_coming); } /* * Does various checks on the endpoint ring, and makes it ready to queue num_trbs. - * FIXME allocate segments if the ring is full. + * expand ring if it start to be full. */ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, u32 ep_state, unsigned int num_trbs, gfp_t mem_flags) { - unsigned int num_trbs_needed; + unsigned int new_segs = 0; /* Make sure the endpoint has been added to xHC schedule */ switch (ep_state) { @@ -2856,6 +3280,7 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, return -EINVAL; case EP_STATE_HALTED: xhci_dbg(xhci, "WARN halted endpoint, queueing URB anyway.\n"); + break; case EP_STATE_STOPPED: case EP_STATE_RUNNING: break; @@ -2868,53 +3293,29 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, return -EINVAL; } - while (1) { - if (room_on_ring(xhci, ep_ring, num_trbs)) - break; - - if (ep_ring == xhci->cmd_ring) { - xhci_err(xhci, "Do not support expand command ring\n"); - return -ENOMEM; - } + if (ep_ring != xhci->cmd_ring) { + new_segs = xhci_ring_expansion_needed(xhci, ep_ring, num_trbs); + } else if (xhci_num_trbs_free(ep_ring) <= num_trbs) { + xhci_err(xhci, "Do not support expand command ring\n"); + return -ENOMEM; + } - xhci_dbg(xhci, "ERROR no room on ep ring, " - "try ring expansion\n"); - num_trbs_needed = num_trbs - ep_ring->num_trbs_free; - if (xhci_ring_expansion(xhci, ep_ring, num_trbs_needed, - mem_flags)) { + if (new_segs) { + xhci_dbg_trace(xhci, trace_xhci_dbg_ring_expansion, + "ERROR no room on ep ring, try ring expansion"); + if (xhci_ring_expansion(xhci, ep_ring, new_segs, mem_flags)) { xhci_err(xhci, "Ring expansion failed\n"); return -ENOMEM; } } - if (enqueue_is_link_trb(ep_ring)) { - struct xhci_ring *ring = ep_ring; - union xhci_trb *next; - - next = ring->enqueue; - - while (last_trb(xhci, ring, ring->enq_seg, next)) { - /* If we're not dealing with 0.95 hardware or isoc rings - * on AMD 0.96 host, clear the chain bit. - */ - if (!xhci_link_trb_quirk(xhci) && - !(ring->type == TYPE_ISOC && - (xhci->quirks & XHCI_AMD_0x96_HOST))) - next->link.control &= cpu_to_le32(~TRB_CHAIN); - else - next->link.control |= cpu_to_le32(TRB_CHAIN); + /* Ensure that new TRBs won't overwrite a link */ + if (trb_is_link(ep_ring->enqueue)) + inc_enq_past_link(xhci, ep_ring, 0); - wmb(); - next->link.control ^= cpu_to_le32(TRB_CYCLE); - - /* Toggle the cycle bit after the last ring segment. */ - if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) { - ring->cycle_state = (ring->cycle_state ? 0 : 1); - } - ring->enq_seg = ring->enq_seg->next; - ring->enqueue = ring->enq_seg->trbs; - next = ring->enqueue; - } + if (last_trb_on_seg(ep_ring->enq_seg, ep_ring->enqueue)) { + xhci_warn(xhci, "Missing link TRB at end of ring segment\n"); + return -EINVAL; } return 0; @@ -2935,21 +3336,21 @@ static int prepare_transfer(struct xhci_hcd *xhci, struct xhci_ring *ep_ring; struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); - ep_ring = xhci_stream_id_to_ring(xdev, ep_index, stream_id); + ep_ring = xhci_triad_to_transfer_ring(xhci, xdev->slot_id, ep_index, + stream_id); if (!ep_ring) { xhci_dbg(xhci, "Can't prepare ring for bad stream ID %u\n", stream_id); return -EINVAL; } - ret = prepare_ring(xhci, ep_ring, - le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK, + ret = prepare_ring(xhci, ep_ring, GET_EP_CTX_STATE(ep_ctx), num_trbs, mem_flags); if (ret) return ret; urb_priv = urb->hcpriv; - td = urb_priv->td[td_index]; + td = &urb_priv->td[td_index]; INIT_LIST_HEAD(&td->td_list); INIT_LIST_HEAD(&td->cancelled_td_list); @@ -2964,53 +3365,60 @@ static int prepare_transfer(struct xhci_hcd *xhci, /* Add this TD to the tail of the endpoint ring's TD list */ list_add_tail(&td->td_list, &ep_ring->td_list); td->start_seg = ep_ring->enq_seg; - td->first_trb = ep_ring->enqueue; - - urb_priv->td[td_index] = td; + td->start_trb = ep_ring->enqueue; return 0; } -static unsigned int count_sg_trbs_needed(struct xhci_hcd *xhci, struct urb *urb) +unsigned int count_trbs(u64 addr, u64 len) +{ + unsigned int num_trbs; + + num_trbs = DIV_ROUND_UP(len + (addr & (TRB_MAX_BUFF_SIZE - 1)), + TRB_MAX_BUFF_SIZE); + if (num_trbs == 0) + num_trbs++; + + return num_trbs; +} + +static inline unsigned int count_trbs_needed(struct urb *urb) +{ + return count_trbs(urb->transfer_dma, urb->transfer_buffer_length); +} + +static unsigned int count_sg_trbs_needed(struct urb *urb) { - int num_sgs, num_trbs, running_total, temp, i; struct scatterlist *sg; + unsigned int i, len, full_len, num_trbs = 0; - sg = NULL; - num_sgs = urb->num_mapped_sgs; - temp = urb->transfer_buffer_length; + full_len = urb->transfer_buffer_length; - num_trbs = 0; - for_each_sg(urb->sg, sg, num_sgs, i) { - unsigned int len = sg_dma_len(sg); - - /* Scatter gather list entries may cross 64KB boundaries */ - running_total = TRB_MAX_BUFF_SIZE - - (sg_dma_address(sg) & (TRB_MAX_BUFF_SIZE - 1)); - running_total &= TRB_MAX_BUFF_SIZE - 1; - if (running_total != 0) - num_trbs++; - - /* How many more 64KB chunks to transfer, how many more TRBs? */ - while (running_total < sg_dma_len(sg) && running_total < temp) { - num_trbs++; - running_total += TRB_MAX_BUFF_SIZE; - } - len = min_t(int, len, temp); - temp -= len; - if (temp == 0) + for_each_sg(urb->sg, sg, urb->num_mapped_sgs, i) { + len = sg_dma_len(sg); + num_trbs += count_trbs(sg_dma_address(sg), len); + len = min_t(unsigned int, len, full_len); + full_len -= len; + if (full_len == 0) break; } + return num_trbs; } -static void check_trb_math(struct urb *urb, int num_trbs, int running_total) +static unsigned int count_isoc_trbs_needed(struct urb *urb, int i) +{ + u64 addr, len; + + addr = (u64) (urb->transfer_dma + urb->iso_frame_desc[i].offset); + len = urb->iso_frame_desc[i].length; + + return count_trbs(addr, len); +} + +static void check_trb_math(struct urb *urb, int running_total) { - if (num_trbs != 0) - dev_err(&urb->dev->dev, "%s - ep %#x - Miscalculated number of " - "TRBs, %d left\n", __func__, - urb->ep->desc.bEndpointAddress, num_trbs); - if (running_total != urb->transfer_buffer_length) + if (unlikely(running_total != urb->transfer_buffer_length)) dev_err(&urb->dev->dev, "%s - ep %#x - Miscalculated tx length, " "queued %#x (%d), asked for %#x (%d)\n", __func__, @@ -3036,60 +3444,50 @@ static void giveback_first_trb(struct xhci_hcd *xhci, int slot_id, xhci_ring_ep_doorbell(xhci, slot_id, ep_index, stream_id); } -/* - * xHCI uses normal TRBs for both bulk and interrupt. When the interrupt - * endpoint is to be serviced, the xHC will consume (at most) one TD. A TD - * (comprised of sg list entries) can take several service intervals to - * transmit. - */ -int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, - struct urb *urb, int slot_id, unsigned int ep_index) +static void check_interval(struct urb *urb, struct xhci_ep_ctx *ep_ctx) { - struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, - xhci->devs[slot_id]->out_ctx, ep_index); int xhci_interval; int ep_interval; xhci_interval = EP_INTERVAL_TO_UFRAMES(le32_to_cpu(ep_ctx->ep_info)); ep_interval = urb->interval; + /* Convert to microframes */ if (urb->dev->speed == USB_SPEED_LOW || urb->dev->speed == USB_SPEED_FULL) ep_interval *= 8; + /* FIXME change this to a warning and a suggestion to use the new API * to set the polling interval (once the API is added). */ if (xhci_interval != ep_interval) { - if (printk_ratelimit()) - dev_dbg(&urb->dev->dev, "Driver uses different interval" - " (%d microframe%s) than xHCI " - "(%d microframe%s)\n", - ep_interval, - ep_interval == 1 ? "" : "s", - xhci_interval, - xhci_interval == 1 ? "" : "s"); + dev_dbg_ratelimited(&urb->dev->dev, + "Driver uses different interval (%d microframe%s) than xHCI (%d microframe%s)\n", + ep_interval, str_plural(ep_interval), + xhci_interval, str_plural(xhci_interval)); urb->interval = xhci_interval; /* Convert back to frames for LS/FS devices */ if (urb->dev->speed == USB_SPEED_LOW || urb->dev->speed == USB_SPEED_FULL) urb->interval /= 8; } - return xhci_queue_bulk_tx(xhci, mem_flags, urb, slot_id, ep_index); } /* - * The TD size is the number of bytes remaining in the TD (including this TRB), - * right shifted by 10. - * It must fit in bits 21:17, so it can't be bigger than 31. + * xHCI uses normal TRBs for both bulk and interrupt. When the interrupt + * endpoint is to be serviced, the xHC will consume (at most) one TD. A TD + * (comprised of sg list entries) can take several service intervals to + * transmit. */ -static u32 xhci_td_remainder(unsigned int remainder) +int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, + struct urb *urb, int slot_id, unsigned int ep_index) { - u32 max = (1 << (21 - 17 + 1)) - 1; + struct xhci_ep_ctx *ep_ctx; - if ((remainder >> 10) >= max) - return max << 17; - else - return (remainder >> 10) << 17; + ep_ctx = xhci_get_ep_ctx(xhci, xhci->devs[slot_id]->out_ctx, ep_index); + check_interval(urb, ep_ctx); + + return xhci_queue_bulk_tx(xhci, mem_flags, urb, slot_id, ep_index); } /* @@ -3104,279 +3502,216 @@ static u32 xhci_td_remainder(unsigned int remainder) * * TD size = total_packet_count - packets_transferred * - * It must fit in bits 21:17, so it can't be bigger than 31. + * For xHCI 0.96 and older, TD size field should be the remaining bytes + * including this TRB, right shifted by 10 + * + * For all hosts it must fit in bits 21:17, so it can't be bigger than 31. + * This is taken care of in the TRB_TD_SIZE() macro + * * The last TRB in a TD must have the TD size set to zero. */ -static u32 xhci_v1_0_td_remainder(int running_total, int trb_buff_len, - unsigned int total_packet_count, struct urb *urb, - unsigned int num_trbs_left) +static u32 xhci_td_remainder(struct xhci_hcd *xhci, int transferred, + int trb_buff_len, unsigned int td_total_len, + struct urb *urb, bool more_trbs_coming) { - int packets_transferred; + u32 maxp, total_packet_count; + + /* MTK xHCI 0.96 contains some features from 1.0 */ + if (xhci->hci_version < 0x100 && !(xhci->quirks & XHCI_MTK_HOST)) + return ((td_total_len - transferred) >> 10); /* One TRB with a zero-length data packet. */ - if (num_trbs_left == 0 || (running_total == 0 && trb_buff_len == 0)) + if (!more_trbs_coming || (transferred == 0 && trb_buff_len == 0) || + trb_buff_len == td_total_len) return 0; - /* All the TRB queueing functions don't count the current TRB in - * running_total. - */ - packets_transferred = (running_total + trb_buff_len) / - GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc)); + /* for MTK xHCI 0.96, TD size include this TRB, but not in 1.x */ + if ((xhci->quirks & XHCI_MTK_HOST) && (xhci->hci_version < 0x100)) + trb_buff_len = 0; - if ((total_packet_count - packets_transferred) > 31) - return 31 << 17; - return (total_packet_count - packets_transferred) << 17; -} + maxp = xhci_usb_endpoint_maxp(urb->dev, urb->ep); + total_packet_count = DIV_ROUND_UP(td_total_len, maxp); -static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags, - struct urb *urb, int slot_id, unsigned int ep_index) -{ - struct xhci_ring *ep_ring; - unsigned int num_trbs; - struct urb_priv *urb_priv; - struct xhci_td *td; - struct scatterlist *sg; - int num_sgs; - int trb_buff_len, this_sg_len, running_total; - unsigned int total_packet_count; - bool first_trb; - u64 addr; - bool more_trbs_coming; + /* Queueing functions don't count the current TRB into transferred */ + return (total_packet_count - ((transferred + trb_buff_len) / maxp)); +} - struct xhci_generic_trb *start_trb; - int start_cycle; - ep_ring = xhci_urb_to_transfer_ring(xhci, urb); - if (!ep_ring) - return -EINVAL; +static int xhci_align_td(struct xhci_hcd *xhci, struct urb *urb, u32 enqd_len, + u32 *trb_buff_len, struct xhci_segment *seg) +{ + struct device *dev = xhci_to_hcd(xhci)->self.sysdev; + unsigned int unalign; + unsigned int max_pkt; + u32 new_buff_len; + size_t len; - num_trbs = count_sg_trbs_needed(xhci, urb); - num_sgs = urb->num_mapped_sgs; - total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length, - usb_endpoint_maxp(&urb->ep->desc)); + max_pkt = xhci_usb_endpoint_maxp(urb->dev, urb->ep); + unalign = (enqd_len + *trb_buff_len) % max_pkt; - trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id], - ep_index, urb->stream_id, - num_trbs, urb, 0, mem_flags); - if (trb_buff_len < 0) - return trb_buff_len; + /* we got lucky, last normal TRB data on segment is packet aligned */ + if (unalign == 0) + return 0; - urb_priv = urb->hcpriv; - td = urb_priv->td[0]; + xhci_dbg(xhci, "Unaligned %d bytes, buff len %d\n", + unalign, *trb_buff_len); - /* - * Don't give the first TRB to the hardware (by toggling the cycle bit) - * until we've finished creating all the other TRBs. The ring's cycle - * state may change as we enqueue the other TRBs, so save it too. - */ - start_trb = &ep_ring->enqueue->generic; - start_cycle = ep_ring->cycle_state; + /* is the last nornal TRB alignable by splitting it */ + if (*trb_buff_len > unalign) { + *trb_buff_len -= unalign; + xhci_dbg(xhci, "split align, new buff len %d\n", *trb_buff_len); + return 0; + } - running_total = 0; /* - * How much data is in the first TRB? - * - * There are three forces at work for TRB buffer pointers and lengths: - * 1. We don't want to walk off the end of this sg-list entry buffer. - * 2. The transfer length that the driver requested may be smaller than - * the amount of memory allocated for this scatter-gather list. - * 3. TRBs buffers can't cross 64KB boundaries. + * We want enqd_len + trb_buff_len to sum up to a number aligned to + * number which is divisible by the endpoint's wMaxPacketSize. IOW: + * (size of currently enqueued TRBs + remainder) % wMaxPacketSize == 0. */ - sg = urb->sg; - addr = (u64) sg_dma_address(sg); - this_sg_len = sg_dma_len(sg); - trb_buff_len = TRB_MAX_BUFF_SIZE - (addr & (TRB_MAX_BUFF_SIZE - 1)); - trb_buff_len = min_t(int, trb_buff_len, this_sg_len); - if (trb_buff_len > urb->transfer_buffer_length) - trb_buff_len = urb->transfer_buffer_length; - - first_trb = true; - /* Queue the first TRB, even if it's zero-length */ - do { - u32 field = 0; - u32 length_field = 0; - u32 remainder = 0; - - /* Don't change the cycle bit of the first TRB until later */ - if (first_trb) { - first_trb = false; - if (start_cycle == 0) - field |= 0x1; - } else - field |= ep_ring->cycle_state; - - /* Chain all the TRBs together; clear the chain bit in the last - * TRB to indicate it's the last TRB in the chain. - */ - if (num_trbs > 1) { - field |= TRB_CHAIN; - } else { - /* FIXME - add check for ZERO_PACKET flag before this */ - td->last_trb = ep_ring->enqueue; - field |= TRB_IOC; - } - - /* Only set interrupt on short packet for IN endpoints */ - if (usb_urb_dir_in(urb)) - field |= TRB_ISP; - - if (TRB_MAX_BUFF_SIZE - - (addr & (TRB_MAX_BUFF_SIZE - 1)) < trb_buff_len) { - xhci_warn(xhci, "WARN: sg dma xfer crosses 64KB boundaries!\n"); - xhci_dbg(xhci, "Next boundary at %#x, end dma = %#x\n", - (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1), - (unsigned int) addr + trb_buff_len); - } - - /* Set the TRB length, TD size, and interrupter fields. */ - if (xhci->hci_version < 0x100) { - remainder = xhci_td_remainder( - urb->transfer_buffer_length - - running_total); + new_buff_len = max_pkt - (enqd_len % max_pkt); + + if (new_buff_len > (urb->transfer_buffer_length - enqd_len)) + new_buff_len = (urb->transfer_buffer_length - enqd_len); + + /* create a max max_pkt sized bounce buffer pointed to by last trb */ + if (usb_urb_dir_out(urb)) { + if (urb->num_sgs) { + len = sg_pcopy_to_buffer(urb->sg, urb->num_sgs, + seg->bounce_buf, new_buff_len, enqd_len); + if (len != new_buff_len) + xhci_warn(xhci, "WARN Wrong bounce buffer write length: %zu != %d\n", + len, new_buff_len); } else { - remainder = xhci_v1_0_td_remainder(running_total, - trb_buff_len, total_packet_count, urb, - num_trbs - 1); + memcpy(seg->bounce_buf, urb->transfer_buffer + enqd_len, new_buff_len); } - length_field = TRB_LEN(trb_buff_len) | - remainder | - TRB_INTR_TARGET(0); - if (num_trbs > 1) - more_trbs_coming = true; - else - more_trbs_coming = false; - queue_trb(xhci, ep_ring, more_trbs_coming, - lower_32_bits(addr), - upper_32_bits(addr), - length_field, - field | TRB_TYPE(TRB_NORMAL)); - --num_trbs; - running_total += trb_buff_len; + seg->bounce_dma = dma_map_single(dev, seg->bounce_buf, + max_pkt, DMA_TO_DEVICE); + } else { + seg->bounce_dma = dma_map_single(dev, seg->bounce_buf, + max_pkt, DMA_FROM_DEVICE); + } - /* Calculate length for next transfer -- - * Are we done queueing all the TRBs for this sg entry? - */ - this_sg_len -= trb_buff_len; - if (this_sg_len == 0) { - --num_sgs; - if (num_sgs == 0) - break; - sg = sg_next(sg); - addr = (u64) sg_dma_address(sg); - this_sg_len = sg_dma_len(sg); - } else { - addr += trb_buff_len; - } + if (dma_mapping_error(dev, seg->bounce_dma)) { + /* try without aligning. Some host controllers survive */ + xhci_warn(xhci, "Failed mapping bounce buffer, not aligning\n"); + return 0; + } + *trb_buff_len = new_buff_len; + seg->bounce_len = new_buff_len; + seg->bounce_offs = enqd_len; - trb_buff_len = TRB_MAX_BUFF_SIZE - - (addr & (TRB_MAX_BUFF_SIZE - 1)); - trb_buff_len = min_t(int, trb_buff_len, this_sg_len); - if (running_total + trb_buff_len > urb->transfer_buffer_length) - trb_buff_len = - urb->transfer_buffer_length - running_total; - } while (running_total < urb->transfer_buffer_length); + xhci_dbg(xhci, "Bounce align, new buff len %d\n", *trb_buff_len); - check_trb_math(urb, num_trbs, running_total); - giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id, - start_cycle, start_trb); - return 0; + return 1; } /* This is very similar to what ehci-q.c qtd_fill() does */ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) { - struct xhci_ring *ep_ring; + struct xhci_ring *ring; struct urb_priv *urb_priv; struct xhci_td *td; - int num_trbs; struct xhci_generic_trb *start_trb; - bool first_trb; - bool more_trbs_coming; - int start_cycle; - u32 field, length_field; - - int running_total, trb_buff_len, ret; - unsigned int total_packet_count; - u64 addr; - - if (urb->num_sgs) - return queue_bulk_sg_tx(xhci, mem_flags, urb, slot_id, ep_index); - - ep_ring = xhci_urb_to_transfer_ring(xhci, urb); - if (!ep_ring) + struct scatterlist *sg = NULL; + bool more_trbs_coming = true; + bool need_zero_pkt = false; + bool first_trb = true; + unsigned int num_trbs; + unsigned int start_cycle, num_sgs = 0; + unsigned int enqd_len, block_len, trb_buff_len, full_len; + int sent_len, ret; + u32 field, length_field, remainder; + u64 addr, send_addr; + + ring = xhci_urb_to_transfer_ring(xhci, urb); + if (!ring) return -EINVAL; - num_trbs = 0; - /* How much data is (potentially) left before the 64KB boundary? */ - running_total = TRB_MAX_BUFF_SIZE - - (urb->transfer_dma & (TRB_MAX_BUFF_SIZE - 1)); - running_total &= TRB_MAX_BUFF_SIZE - 1; - - /* If there's some data on this 64KB chunk, or we have to send a - * zero-length transfer, we need at least one TRB - */ - if (running_total != 0 || urb->transfer_buffer_length == 0) - num_trbs++; - /* How many more 64KB chunks to transfer, how many more TRBs? */ - while (running_total < urb->transfer_buffer_length) { - num_trbs++; - running_total += TRB_MAX_BUFF_SIZE; + full_len = urb->transfer_buffer_length; + /* If we have scatter/gather list, we use it. */ + if (urb->num_sgs && !(urb->transfer_flags & URB_DMA_MAP_SINGLE)) { + num_sgs = urb->num_mapped_sgs; + sg = urb->sg; + addr = (u64) sg_dma_address(sg); + block_len = sg_dma_len(sg); + num_trbs = count_sg_trbs_needed(urb); + } else { + num_trbs = count_trbs_needed(urb); + addr = (u64) urb->transfer_dma; + block_len = full_len; } - /* FIXME: this doesn't deal with URB_ZERO_PACKET - need one more */ - ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, urb->stream_id, num_trbs, urb, 0, mem_flags); - if (ret < 0) + if (unlikely(ret < 0)) return ret; urb_priv = urb->hcpriv; - td = urb_priv->td[0]; + + /* Deal with URB_ZERO_PACKET - need one more td/trb */ + if (urb->transfer_flags & URB_ZERO_PACKET && urb_priv->num_tds > 1) + need_zero_pkt = true; + + td = &urb_priv->td[0]; /* * Don't give the first TRB to the hardware (by toggling the cycle bit) * until we've finished creating all the other TRBs. The ring's cycle * state may change as we enqueue the other TRBs, so save it too. */ - start_trb = &ep_ring->enqueue->generic; - start_cycle = ep_ring->cycle_state; + start_trb = &ring->enqueue->generic; + start_cycle = ring->cycle_state; + send_addr = addr; - running_total = 0; - total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length, - usb_endpoint_maxp(&urb->ep->desc)); - /* How much data is in the first TRB? */ - addr = (u64) urb->transfer_dma; - trb_buff_len = TRB_MAX_BUFF_SIZE - - (urb->transfer_dma & (TRB_MAX_BUFF_SIZE - 1)); - if (trb_buff_len > urb->transfer_buffer_length) - trb_buff_len = urb->transfer_buffer_length; + /* Queue the TRBs, even if they are zero-length */ + for (enqd_len = 0; first_trb || enqd_len < full_len; + enqd_len += trb_buff_len) { + field = TRB_TYPE(TRB_NORMAL); - first_trb = true; + /* TRB buffer should not cross 64KB boundaries */ + trb_buff_len = TRB_BUFF_LEN_UP_TO_BOUNDARY(addr); + trb_buff_len = min_t(unsigned int, trb_buff_len, block_len); - /* Queue the first TRB, even if it's zero-length */ - do { - u32 remainder = 0; - field = 0; + if (enqd_len + trb_buff_len > full_len) + trb_buff_len = full_len - enqd_len; /* Don't change the cycle bit of the first TRB until later */ if (first_trb) { first_trb = false; if (start_cycle == 0) - field |= 0x1; + field |= TRB_CYCLE; } else - field |= ep_ring->cycle_state; + field |= ring->cycle_state; /* Chain all the TRBs together; clear the chain bit in the last * TRB to indicate it's the last TRB in the chain. */ - if (num_trbs > 1) { + if (enqd_len + trb_buff_len < full_len) { field |= TRB_CHAIN; - } else { - /* FIXME - add check for ZERO_PACKET flag before this */ - td->last_trb = ep_ring->enqueue; + if (trb_is_link(ring->enqueue + 1)) { + if (xhci_align_td(xhci, urb, enqd_len, + &trb_buff_len, + ring->enq_seg)) { + send_addr = ring->enq_seg->bounce_dma; + /* assuming TD won't span 2 segs */ + td->bounce_seg = ring->enq_seg; + } + } + } + if (enqd_len + trb_buff_len >= full_len) { + field &= ~TRB_CHAIN; field |= TRB_IOC; + more_trbs_coming = false; + td->end_trb = ring->enqueue; + td->end_seg = ring->enq_seg; + if (xhci_urb_suitable_for_idt(urb)) { + memcpy(&send_addr, urb->transfer_buffer, + trb_buff_len); + le64_to_cpus(&send_addr); + field |= TRB_IDT; + } } /* Only set interrupt on short packet for IN endpoints */ @@ -3384,39 +3719,47 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, field |= TRB_ISP; /* Set the TRB length, TD size, and interrupter fields. */ - if (xhci->hci_version < 0x100) { - remainder = xhci_td_remainder( - urb->transfer_buffer_length - - running_total); - } else { - remainder = xhci_v1_0_td_remainder(running_total, - trb_buff_len, total_packet_count, urb, - num_trbs - 1); - } + remainder = xhci_td_remainder(xhci, enqd_len, trb_buff_len, + full_len, urb, more_trbs_coming); + length_field = TRB_LEN(trb_buff_len) | - remainder | + TRB_TD_SIZE(remainder) | TRB_INTR_TARGET(0); - if (num_trbs > 1) - more_trbs_coming = true; - else - more_trbs_coming = false; - queue_trb(xhci, ep_ring, more_trbs_coming, - lower_32_bits(addr), - upper_32_bits(addr), + queue_trb(xhci, ring, more_trbs_coming | need_zero_pkt, + lower_32_bits(send_addr), + upper_32_bits(send_addr), length_field, - field | TRB_TYPE(TRB_NORMAL)); - --num_trbs; - running_total += trb_buff_len; - - /* Calculate length for next transfer */ + field); addr += trb_buff_len; - trb_buff_len = urb->transfer_buffer_length - running_total; - if (trb_buff_len > TRB_MAX_BUFF_SIZE) - trb_buff_len = TRB_MAX_BUFF_SIZE; - } while (running_total < urb->transfer_buffer_length); + sent_len = trb_buff_len; - check_trb_math(urb, num_trbs, running_total); + while (sg && sent_len >= block_len) { + /* New sg entry */ + --num_sgs; + sent_len -= block_len; + sg = sg_next(sg); + if (num_sgs != 0 && sg) { + block_len = sg_dma_len(sg); + addr = (u64) sg_dma_address(sg); + addr += sent_len; + } + } + block_len -= sent_len; + send_addr = addr; + } + + if (need_zero_pkt) { + ret = prepare_transfer(xhci, xhci->devs[slot_id], + ep_index, urb->stream_id, + 1, urb, 1, mem_flags); + urb_priv->td[1].end_trb = ring->enqueue; + urb_priv->td[1].end_seg = ring->enq_seg; + field = TRB_TYPE(TRB_NORMAL) | ring->cycle_state | TRB_IOC; + queue_trb(xhci, ring, 0, 0, 0, TRB_INTR_TARGET(0), field); + } + + check_trb_math(urb, enqd_len); giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id, start_cycle, start_trb); return 0; @@ -3432,7 +3775,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct usb_ctrlrequest *setup; struct xhci_generic_trb *start_trb; int start_cycle; - u32 field, length_field; + u32 field; struct urb_priv *urb_priv; struct xhci_td *td; @@ -3447,6 +3790,20 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, if (!urb->setup_packet) return -EINVAL; + if ((xhci->quirks & XHCI_ETRON_HOST) && + urb->dev->speed >= USB_SPEED_SUPER) { + /* + * If next available TRB is the Link TRB in the ring segment then + * enqueue a No Op TRB, this can prevent the Setup and Data Stage + * TRB to be breaked by the Link TRB. + */ + if (last_trb_on_seg(ep_ring->enq_seg, ep_ring->enqueue + 1)) { + field = TRB_TYPE(TRB_TR_NOOP) | ep_ring->cycle_state; + queue_trb(xhci, ep_ring, false, 0, 0, + TRB_INTR_TARGET(0), field); + } + } + /* 1 TRB for setup, 1 for status */ num_trbs = 2; /* @@ -3463,7 +3820,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, return ret; urb_priv = urb->hcpriv; - td = urb_priv->td[0]; + td = &urb_priv->td[0]; /* * Don't give the first TRB to the hardware (by toggling the cycle bit) @@ -3481,8 +3838,8 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, if (start_cycle == 0) field |= 0x1; - /* xHCI 1.0 6.4.1.2.1: Transfer Type field */ - if (xhci->hci_version == 0x100) { + /* xHCI 1.0/1.1 6.4.1.2.1: Transfer Type field */ + if ((xhci->hci_version >= 0x100) || (xhci->quirks & XHCI_MTK_HOST)) { if (urb->transfer_buffer_length > 0) { if (setup->bRequestType & USB_DIR_IN) field |= TRB_TX_TYPE(TRB_DATA_IN); @@ -3505,21 +3862,38 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, else field = TRB_TYPE(TRB_DATA); - length_field = TRB_LEN(urb->transfer_buffer_length) | - xhci_td_remainder(urb->transfer_buffer_length) | - TRB_INTR_TARGET(0); if (urb->transfer_buffer_length > 0) { + u32 length_field, remainder; + u64 addr; + + if (xhci_urb_suitable_for_idt(urb)) { + memcpy(&addr, urb->transfer_buffer, + urb->transfer_buffer_length); + le64_to_cpus(&addr); + field |= TRB_IDT; + } else { + addr = (u64) urb->transfer_dma; + } + + remainder = xhci_td_remainder(xhci, 0, + urb->transfer_buffer_length, + urb->transfer_buffer_length, + urb, 1); + length_field = TRB_LEN(urb->transfer_buffer_length) | + TRB_TD_SIZE(remainder) | + TRB_INTR_TARGET(0); if (setup->bRequestType & USB_DIR_IN) field |= TRB_DIR_IN; queue_trb(xhci, ep_ring, true, - lower_32_bits(urb->transfer_dma), - upper_32_bits(urb->transfer_dma), + lower_32_bits(addr), + upper_32_bits(addr), length_field, field | ep_ring->cycle_state); } /* Save the DMA address of the last TRB in the TD */ - td->last_trb = ep_ring->enqueue; + td->end_trb = ep_ring->enqueue; + td->end_seg = ep_ring->enq_seg; /* Queue status TRB - see Table 7 and sections 4.11.2.2 and 6.4.1.2.3 */ /* If the device sent data, the status stage is an OUT transfer */ @@ -3539,23 +3913,6 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, return 0; } -static int count_isoc_trbs_needed(struct xhci_hcd *xhci, - struct urb *urb, int i) -{ - int num_trbs = 0; - u64 addr, td_len; - - addr = (u64) (urb->transfer_dma + urb->iso_frame_desc[i].offset); - td_len = urb->iso_frame_desc[i].length; - - num_trbs = DIV_ROUND_UP(td_len + (addr & (TRB_MAX_BUFF_SIZE - 1)), - TRB_MAX_BUFF_SIZE); - if (num_trbs == 0) - num_trbs++; - - return num_trbs; -} - /* * The transfer burst count field of the isochronous TRB defines the number of * bursts that are required to move all packets in this TD. Only SuperSpeed @@ -3565,16 +3922,15 @@ static int count_isoc_trbs_needed(struct xhci_hcd *xhci, * zero. Only xHCI 1.0 host controllers support this field. */ static unsigned int xhci_get_burst_count(struct xhci_hcd *xhci, - struct usb_device *udev, struct urb *urb, unsigned int total_packet_count) { unsigned int max_burst; - if (xhci->hci_version < 0x100 || udev->speed != USB_SPEED_SUPER) + if (xhci->hci_version < 0x100 || urb->dev->speed < USB_SPEED_SUPER) return 0; max_burst = urb->ep->ss_ep_comp.bMaxBurst; - return roundup(total_packet_count, max_burst + 1) - 1; + return DIV_ROUND_UP(total_packet_count, max_burst + 1) - 1; } /* @@ -3586,7 +3942,6 @@ static unsigned int xhci_get_burst_count(struct xhci_hcd *xhci, * contain 1 to (bMaxBurst + 1) packets. */ static unsigned int xhci_get_last_burst_packet_count(struct xhci_hcd *xhci, - struct usb_device *udev, struct urb *urb, unsigned int total_packet_count) { unsigned int max_burst; @@ -3595,8 +3950,7 @@ static unsigned int xhci_get_last_burst_packet_count(struct xhci_hcd *xhci, if (xhci->hci_version < 0x100) return 0; - switch (udev->speed) { - case USB_SPEED_SUPER: + if (urb->dev->speed >= USB_SPEED_SUPER) { /* bMaxBurst is zero based: 0 means 1 packet per burst */ max_burst = urb->ep->ss_ep_comp.bMaxBurst; residue = total_packet_count % (max_burst + 1); @@ -3606,17 +3960,123 @@ static unsigned int xhci_get_last_burst_packet_count(struct xhci_hcd *xhci, if (residue == 0) return max_burst; return residue - 1; - default: - if (total_packet_count == 0) - return 0; - return total_packet_count - 1; } + if (total_packet_count == 0) + return 0; + return total_packet_count - 1; +} + +/* Returns the Isochronous Scheduling Threshold in Microframes. 1 Frame is 8 Microframes. */ +static int xhci_ist_microframes(struct xhci_hcd *xhci) +{ + int ist = HCS_IST_VALUE(xhci->hcs_params2); + + if (xhci->hcs_params2 & HCS_IST_UNIT) + ist *= 8; + return ist; +} + +/* + * Calculates Frame ID field of the isochronous TRB identifies the + * target frame that the Interval associated with this Isochronous + * Transfer Descriptor will start on. Refer to 4.11.2.5 in 1.1 spec. + * + * Returns actual frame id on success, negative value on error. + */ +static int xhci_get_isoc_frame_id(struct xhci_hcd *xhci, + struct urb *urb, int index) +{ + int start_frame, ist, ret = 0; + int start_frame_id, end_frame_id, current_frame_id; + + if (urb->dev->speed == USB_SPEED_LOW || + urb->dev->speed == USB_SPEED_FULL) + start_frame = urb->start_frame + index * urb->interval; + else + start_frame = (urb->start_frame + index * urb->interval) >> 3; + + ist = xhci_ist_microframes(xhci); + + /* Software shall not schedule an Isoch TD with a Frame ID value that + * is less than the Start Frame ID or greater than the End Frame ID, + * where: + * + * End Frame ID = (Current MFINDEX register value + 895 ms.) MOD 2048 + * Start Frame ID = (Current MFINDEX register value + IST + 1) MOD 2048 + * + * Both the End Frame ID and Start Frame ID values are calculated + * in microframes. When software determines the valid Frame ID value; + * The End Frame ID value should be rounded down to the nearest Frame + * boundary, and the Start Frame ID value should be rounded up to the + * nearest Frame boundary. + */ + current_frame_id = readl(&xhci->run_regs->microframe_index); + start_frame_id = roundup(current_frame_id + ist + 1, 8); + end_frame_id = rounddown(current_frame_id + 895 * 8, 8); + + start_frame &= 0x7ff; + start_frame_id = (start_frame_id >> 3) & 0x7ff; + end_frame_id = (end_frame_id >> 3) & 0x7ff; + + if (start_frame_id < end_frame_id) { + if (start_frame > end_frame_id || + start_frame < start_frame_id) + ret = -EINVAL; + } else if (start_frame_id > end_frame_id) { + if ((start_frame > end_frame_id && + start_frame < start_frame_id)) + ret = -EINVAL; + } else { + ret = -EINVAL; + } + + if (index == 0) { + if (ret == -EINVAL || start_frame == start_frame_id) { + start_frame = start_frame_id + 1; + if (urb->dev->speed == USB_SPEED_LOW || + urb->dev->speed == USB_SPEED_FULL) + urb->start_frame = start_frame; + else + urb->start_frame = start_frame << 3; + ret = 0; + } + } + + if (ret) { + xhci_warn(xhci, "Frame ID %d (reg %d, index %d) beyond range (%d, %d)\n", + start_frame, current_frame_id, index, + start_frame_id, end_frame_id); + xhci_warn(xhci, "Ignore frame ID field, use SIA bit instead\n"); + return ret; + } + + return start_frame; +} + +/* Check if we should generate event interrupt for a TD in an isoc URB */ +static bool trb_block_event_intr(struct xhci_hcd *xhci, int num_tds, int i, + struct xhci_interrupter *ir) +{ + if (xhci->hci_version < 0x100) + return false; + /* always generate an event interrupt for the last TD */ + if (i == num_tds - 1) + return false; + /* + * If AVOID_BEI is set the host handles full event rings poorly, + * generate an event at least every 8th TD to clear the event ring + */ + if (i && ir->isoc_bei_interval && xhci->quirks & XHCI_AVOID_BEI) + return !!(i % ir->isoc_bei_interval); + + return true; } /* This is for isoc transfer */ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) { + struct xhci_interrupter *ir; struct xhci_ring *ep_ring; struct urb_priv *urb_priv; struct xhci_td *td; @@ -3629,43 +4089,45 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, u64 start_addr, addr; int i, j; bool more_trbs_coming; + struct xhci_virt_ep *xep; + int frame_id; + xep = &xhci->devs[slot_id]->eps[ep_index]; ep_ring = xhci->devs[slot_id]->eps[ep_index].ring; + ir = xhci->interrupters[0]; num_tds = urb->number_of_packets; if (num_tds < 1) { xhci_dbg(xhci, "Isoc URB with zero packets?\n"); return -EINVAL; } - start_addr = (u64) urb->transfer_dma; start_trb = &ep_ring->enqueue->generic; start_cycle = ep_ring->cycle_state; urb_priv = urb->hcpriv; - /* Queue the first TRB, even if it's zero-length */ + /* Queue the TRBs for each TD, even if they are zero-length */ for (i = 0; i < num_tds; i++) { - unsigned int total_packet_count; - unsigned int burst_count; - unsigned int residue; + unsigned int total_pkt_count, max_pkt; + unsigned int burst_count, last_burst_pkt_count; + u32 sia_frame_id; first_trb = true; running_total = 0; addr = start_addr + urb->iso_frame_desc[i].offset; td_len = urb->iso_frame_desc[i].length; td_remain_len = td_len; - total_packet_count = DIV_ROUND_UP(td_len, - GET_MAX_PACKET( - usb_endpoint_maxp(&urb->ep->desc))); + max_pkt = xhci_usb_endpoint_maxp(urb->dev, urb->ep); + total_pkt_count = DIV_ROUND_UP(td_len, max_pkt); + /* A zero-length transfer still involves at least one packet. */ - if (total_packet_count == 0) - total_packet_count++; - burst_count = xhci_get_burst_count(xhci, urb->dev, urb, - total_packet_count); - residue = xhci_get_last_burst_packet_count(xhci, - urb->dev, urb, total_packet_count); + if (total_pkt_count == 0) + total_pkt_count++; + burst_count = xhci_get_burst_count(xhci, urb, total_pkt_count); + last_burst_pkt_count = xhci_get_last_burst_packet_count(xhci, + urb, total_pkt_count); - trbs_per_td = count_isoc_trbs_needed(xhci, urb, i); + trbs_per_td = count_isoc_trbs_needed(urb, i); ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, urb->stream_id, trbs_per_td, urb, i, mem_flags); @@ -3674,75 +4136,74 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, return ret; goto cleanup; } + td = &urb_priv->td[i]; + /* use SIA as default, if frame id is used overwrite it */ + sia_frame_id = TRB_SIA; + if (!(urb->transfer_flags & URB_ISO_ASAP) && + (xhci->hcc_params & HCC_CFC)) { + frame_id = xhci_get_isoc_frame_id(xhci, urb, i); + if (frame_id >= 0) + sia_frame_id = TRB_FRAME_ID(frame_id); + } + /* + * Set isoc specific data for the first TRB in a TD. + * Prevent HW from getting the TRBs by keeping the cycle state + * inverted in the first TDs isoc TRB. + */ + field = TRB_TYPE(TRB_ISOC) | + TRB_TLBPC(last_burst_pkt_count) | + sia_frame_id | + (i ? ep_ring->cycle_state : !start_cycle); + + /* xhci 1.1 with ETE uses TD_Size field for TBC, old is Rsvdz */ + if (!xep->use_extended_tbc) + field |= TRB_TBC(burst_count); - td = urb_priv->td[i]; + /* fill the rest of the TRB fields, and remaining normal TRBs */ for (j = 0; j < trbs_per_td; j++) { u32 remainder = 0; - field = 0; - - if (first_trb) { - field = TRB_TBC(burst_count) | - TRB_TLBPC(residue); - /* Queue the isoc TRB */ - field |= TRB_TYPE(TRB_ISOC); - /* Assume URB_ISO_ASAP is set */ - field |= TRB_SIA; - if (i == 0) { - if (start_cycle == 0) - field |= 0x1; - } else - field |= ep_ring->cycle_state; - first_trb = false; - } else { - /* Queue other normal TRBs */ - field |= TRB_TYPE(TRB_NORMAL); - field |= ep_ring->cycle_state; - } + + /* only first TRB is isoc, overwrite otherwise */ + if (!first_trb) + field = TRB_TYPE(TRB_NORMAL) | + ep_ring->cycle_state; /* Only set interrupt on short packet for IN EPs */ if (usb_urb_dir_in(urb)) field |= TRB_ISP; - /* Chain all the TRBs together; clear the chain bit in - * the last TRB to indicate it's the last TRB in the - * chain. - */ + /* Set the chain bit for all except the last TRB */ if (j < trbs_per_td - 1) { - field |= TRB_CHAIN; more_trbs_coming = true; + field |= TRB_CHAIN; } else { - td->last_trb = ep_ring->enqueue; - field |= TRB_IOC; - if (xhci->hci_version == 0x100 && - !(xhci->quirks & - XHCI_AVOID_BEI)) { - /* Set BEI bit except for the last td */ - if (i < num_tds - 1) - field |= TRB_BEI; - } more_trbs_coming = false; + td->end_trb = ep_ring->enqueue; + td->end_seg = ep_ring->enq_seg; + field |= TRB_IOC; + if (trb_block_event_intr(xhci, num_tds, i, ir)) + field |= TRB_BEI; } - /* Calculate TRB length */ - trb_buff_len = TRB_MAX_BUFF_SIZE - - (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); + trb_buff_len = TRB_BUFF_LEN_UP_TO_BOUNDARY(addr); if (trb_buff_len > td_remain_len) trb_buff_len = td_remain_len; /* Set the TRB length, TD size, & interrupter fields. */ - if (xhci->hci_version < 0x100) { - remainder = xhci_td_remainder( - td_len - running_total); - } else { - remainder = xhci_v1_0_td_remainder( - running_total, trb_buff_len, - total_packet_count, urb, - (trbs_per_td - j - 1)); - } + remainder = xhci_td_remainder(xhci, running_total, + trb_buff_len, td_len, + urb, more_trbs_coming); + length_field = TRB_LEN(trb_buff_len) | - remainder | TRB_INTR_TARGET(0); + /* xhci 1.1 with ETE uses TD Size field for TBC */ + if (first_trb && xep->use_extended_tbc) + length_field |= TRB_TD_SIZE_TBC(burst_count); + else + length_field |= TRB_TD_SIZE(remainder); + first_trb = false; + queue_trb(xhci, ep_ring, more_trbs_coming, lower_32_bits(addr), upper_32_bits(addr), @@ -3762,6 +4223,10 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, } } + /* store the next frame id */ + if (xhci->hcc_params & HCC_CFC) + xep->next_frame_id = urb->start_frame + num_tds * urb->interval; + if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs == 0) { if (xhci->quirks & XHCI_AMD_PLL_FIX) usb_amd_quirk_pll_disable(); @@ -3775,22 +4240,21 @@ cleanup: /* Clean up a partially enqueued isoc transfer. */ for (i--; i >= 0; i--) - list_del_init(&urb_priv->td[i]->td_list); + list_del_init(&urb_priv->td[i].td_list); /* Use the first TD as a temporary variable to turn the TDs we've queued * into No-ops with a software-owned cycle bit. That way the hardware * won't accidentally start executing bogus TDs when we partially - * overwrite them. td->first_trb and td->start_seg are already set. + * overwrite them. td->start_trb and td->start_seg are already set. */ - urb_priv->td[0]->last_trb = ep_ring->enqueue; + urb_priv->td[0].end_trb = ep_ring->enqueue; /* Every TRB except the first & last will have its cycle bit flipped. */ - td_to_noop(xhci, ep_ring, urb_priv->td[0], true); + td_to_noop(xhci, xep, &urb_priv->td[0], true); /* Reset the ring enqueue back to the first TRB and its cycle bit. */ - ep_ring->enqueue = urb_priv->td[0]->first_trb; - ep_ring->enq_seg = urb_priv->td[0]->start_seg; + ep_ring->enqueue = urb_priv->td[0].start_trb; + ep_ring->enq_seg = urb_priv->td[0].start_seg; ep_ring->cycle_state = start_cycle; - ep_ring->num_trbs_free = ep_ring->num_trbs_free_temp; usb_hcd_unlink_urb_from_ep(bus_to_hcd(urb->dev->bus), urb); return ret; } @@ -3798,9 +4262,9 @@ cleanup: /* * Check transfer ring to guarantee there is enough room for the urb. * Update ISO URB start_frame and interval. - * Update interval as xhci_queue_intr_tx does. Just use xhci frame_index to - * update the urb->start_frame by now. - * Always assume URB_ISO_ASAP set, and NEVER use urb->start_frame as input. + * Update interval as xhci_queue_intr_tx does. Use xhci frame_index to + * update urb->start_frame if URB_ISO_ASAP is set in transfer_flags or + * Contiguous Frame ID is not supported by HC. */ int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) @@ -3809,61 +4273,67 @@ int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags, struct xhci_ring *ep_ring; struct xhci_ep_ctx *ep_ctx; int start_frame; - int xhci_interval; - int ep_interval; int num_tds, num_trbs, i; int ret; + struct xhci_virt_ep *xep; + int ist; xdev = xhci->devs[slot_id]; + xep = &xhci->devs[slot_id]->eps[ep_index]; ep_ring = xdev->eps[ep_index].ring; ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); num_trbs = 0; num_tds = urb->number_of_packets; for (i = 0; i < num_tds; i++) - num_trbs += count_isoc_trbs_needed(xhci, urb, i); + num_trbs += count_isoc_trbs_needed(urb, i); /* Check the ring to guarantee there is enough room for the whole urb. * Do not insert any td of the urb to the ring if the check failed. */ - ret = prepare_ring(xhci, ep_ring, le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK, + ret = prepare_ring(xhci, ep_ring, GET_EP_CTX_STATE(ep_ctx), num_trbs, mem_flags); if (ret) return ret; - start_frame = xhci_readl(xhci, &xhci->run_regs->microframe_index); - start_frame &= 0x3fff; + /* + * Check interval value. This should be done before we start to + * calculate the start frame value. + */ + check_interval(urb, ep_ctx); - urb->start_frame = start_frame; - if (urb->dev->speed == USB_SPEED_LOW || - urb->dev->speed == USB_SPEED_FULL) - urb->start_frame >>= 3; + /* Calculate the start frame and put it in urb->start_frame. */ + if ((xhci->hcc_params & HCC_CFC) && !list_empty(&ep_ring->td_list)) { + if (GET_EP_CTX_STATE(ep_ctx) == EP_STATE_RUNNING) { + urb->start_frame = xep->next_frame_id; + goto skip_start_over; + } + } - xhci_interval = EP_INTERVAL_TO_UFRAMES(le32_to_cpu(ep_ctx->ep_info)); - ep_interval = urb->interval; - /* Convert to microframes */ - if (urb->dev->speed == USB_SPEED_LOW || - urb->dev->speed == USB_SPEED_FULL) - ep_interval *= 8; - /* FIXME change this to a warning and a suggestion to use the new API - * to set the polling interval (once the API is added). + start_frame = readl(&xhci->run_regs->microframe_index); + start_frame &= 0x3fff; + /* + * Round up to the next frame and consider the time before trb really + * gets scheduled by hardare. */ - if (xhci_interval != ep_interval) { - if (printk_ratelimit()) - dev_dbg(&urb->dev->dev, "Driver uses different interval" - " (%d microframe%s) than xHCI " - "(%d microframe%s)\n", - ep_interval, - ep_interval == 1 ? "" : "s", - xhci_interval, - xhci_interval == 1 ? "" : "s"); - urb->interval = xhci_interval; - /* Convert back to frames for LS/FS devices */ - if (urb->dev->speed == USB_SPEED_LOW || - urb->dev->speed == USB_SPEED_FULL) - urb->interval /= 8; + ist = xhci_ist_microframes(xhci); + start_frame += ist + XHCI_CFC_DELAY; + start_frame = roundup(start_frame, 8); + + /* + * Round up to the next ESIT (Endpoint Service Interval Time) if ESIT + * is greate than 8 microframes. + */ + if (urb->dev->speed == USB_SPEED_LOW || + urb->dev->speed == USB_SPEED_FULL) { + start_frame = roundup(start_frame, urb->interval << 3); + urb->start_frame = start_frame >> 3; + } else { + start_frame = roundup(start_frame, urb->interval); + urb->start_frame = start_frame; } - ep_ring->num_trbs_free_temp = ep_ring->num_trbs_free; + +skip_start_over: return xhci_queue_isoc_tx(xhci, mem_flags, urb, slot_id, ep_index); } @@ -3878,12 +4348,20 @@ int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags, * Don't decrement xhci->cmd_ring_reserved_trbs after we've queued the TRB * because the command event handler may want to resubmit a failed command. */ -static int queue_command(struct xhci_hcd *xhci, u32 field1, u32 field2, - u32 field3, u32 field4, bool command_must_succeed) +static int queue_command(struct xhci_hcd *xhci, struct xhci_command *cmd, + u32 field1, u32 field2, + u32 field3, u32 field4, bool command_must_succeed) { int reserved_trbs = xhci->cmd_ring_reserved_trbs; int ret; + if ((xhci->xhc_state & XHCI_STATE_DYING) || + (xhci->xhc_state & XHCI_STATE_HALTED)) { + xhci_dbg(xhci, "xHCI dying or halted, can't queue_command. state: 0x%x\n", + xhci->xhc_state); + return -ESHUTDOWN; + } + if (!command_must_succeed) reserved_trbs++; @@ -3896,57 +4374,82 @@ static int queue_command(struct xhci_hcd *xhci, u32 field1, u32 field2, "unfailable commands failed.\n"); return ret; } + + cmd->command_trb = xhci->cmd_ring->enqueue; + + /* if there are no other commands queued we start the timeout timer */ + if (list_empty(&xhci->cmd_list)) { + xhci->current_cmd = cmd; + xhci_mod_cmd_timer(xhci); + } + + list_add_tail(&cmd->cmd_list, &xhci->cmd_list); + queue_trb(xhci, xhci->cmd_ring, false, field1, field2, field3, field4 | xhci->cmd_ring->cycle_state); return 0; } /* Queue a slot enable or disable request on the command ring */ -int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id) +int xhci_queue_slot_control(struct xhci_hcd *xhci, struct xhci_command *cmd, + u32 trb_type, u32 slot_id) { - return queue_command(xhci, 0, 0, 0, + return queue_command(xhci, cmd, 0, 0, 0, TRB_TYPE(trb_type) | SLOT_ID_FOR_TRB(slot_id), false); } /* Queue an address device command TRB */ -int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, - u32 slot_id) +int xhci_queue_address_device(struct xhci_hcd *xhci, struct xhci_command *cmd, + dma_addr_t in_ctx_ptr, u32 slot_id, enum xhci_setup_dev setup) { - return queue_command(xhci, lower_32_bits(in_ctx_ptr), + return queue_command(xhci, cmd, lower_32_bits(in_ctx_ptr), upper_32_bits(in_ctx_ptr), 0, - TRB_TYPE(TRB_ADDR_DEV) | SLOT_ID_FOR_TRB(slot_id), - false); + TRB_TYPE(TRB_ADDR_DEV) | SLOT_ID_FOR_TRB(slot_id) + | (setup == SETUP_CONTEXT_ONLY ? TRB_BSR : 0), false); } -int xhci_queue_vendor_command(struct xhci_hcd *xhci, +int xhci_queue_vendor_command(struct xhci_hcd *xhci, struct xhci_command *cmd, u32 field1, u32 field2, u32 field3, u32 field4) { - return queue_command(xhci, field1, field2, field3, field4, false); + return queue_command(xhci, cmd, field1, field2, field3, field4, false); } /* Queue a reset device command TRB */ -int xhci_queue_reset_device(struct xhci_hcd *xhci, u32 slot_id) +int xhci_queue_reset_device(struct xhci_hcd *xhci, struct xhci_command *cmd, + u32 slot_id) { - return queue_command(xhci, 0, 0, 0, + return queue_command(xhci, cmd, 0, 0, 0, TRB_TYPE(TRB_RESET_DEV) | SLOT_ID_FOR_TRB(slot_id), false); } /* Queue a configure endpoint command TRB */ -int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, +int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, + struct xhci_command *cmd, dma_addr_t in_ctx_ptr, u32 slot_id, bool command_must_succeed) { - return queue_command(xhci, lower_32_bits(in_ctx_ptr), + return queue_command(xhci, cmd, lower_32_bits(in_ctx_ptr), upper_32_bits(in_ctx_ptr), 0, TRB_TYPE(TRB_CONFIG_EP) | SLOT_ID_FOR_TRB(slot_id), command_must_succeed); } +/* Queue a get root hub port bandwidth command TRB */ +int xhci_queue_get_port_bw(struct xhci_hcd *xhci, + struct xhci_command *cmd, dma_addr_t in_ctx_ptr, + u8 dev_speed, bool command_must_succeed) +{ + return queue_command(xhci, cmd, lower_32_bits(in_ctx_ptr), + upper_32_bits(in_ctx_ptr), 0, + TRB_TYPE(TRB_GET_BW) | DEV_SPEED_FOR_TRB(dev_speed), + command_must_succeed); +} + /* Queue an evaluate context command TRB */ -int xhci_queue_evaluate_context(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, - u32 slot_id, bool command_must_succeed) +int xhci_queue_evaluate_context(struct xhci_hcd *xhci, struct xhci_command *cmd, + dma_addr_t in_ctx_ptr, u32 slot_id, bool command_must_succeed) { - return queue_command(xhci, lower_32_bits(in_ctx_ptr), + return queue_command(xhci, cmd, lower_32_bits(in_ctx_ptr), upper_32_bits(in_ctx_ptr), 0, TRB_TYPE(TRB_EVAL_CONTEXT) | SLOT_ID_FOR_TRB(slot_id), command_must_succeed); @@ -3956,60 +4459,29 @@ int xhci_queue_evaluate_context(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, * Suspend is set to indicate "Stop Endpoint Command" is being issued to stop * activity on an endpoint that is about to be suspended. */ -int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, int slot_id, - unsigned int ep_index, int suspend) +int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, struct xhci_command *cmd, + int slot_id, unsigned int ep_index, int suspend) { u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); - u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); + u32 trb_ep_index = EP_INDEX_FOR_TRB(ep_index); u32 type = TRB_TYPE(TRB_STOP_RING); u32 trb_suspend = SUSPEND_PORT_FOR_TRB(suspend); - return queue_command(xhci, 0, 0, 0, + return queue_command(xhci, cmd, 0, 0, 0, trb_slot_id | trb_ep_index | type | trb_suspend, false); } -/* Set Transfer Ring Dequeue Pointer command. - * This should not be used for endpoints that have streams enabled. - */ -static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id, - unsigned int ep_index, unsigned int stream_id, - struct xhci_segment *deq_seg, - union xhci_trb *deq_ptr, u32 cycle_state) -{ - dma_addr_t addr; - u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); - u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); - u32 trb_stream_id = STREAM_ID_FOR_TRB(stream_id); - u32 type = TRB_TYPE(TRB_SET_DEQ); - struct xhci_virt_ep *ep; - - addr = xhci_trb_virt_to_dma(deq_seg, deq_ptr); - if (addr == 0) { - xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr\n"); - xhci_warn(xhci, "WARN deq seg = %p, deq pt = %p\n", - deq_seg, deq_ptr); - return 0; - } - ep = &xhci->devs[slot_id]->eps[ep_index]; - if ((ep->ep_state & SET_DEQ_PENDING)) { - xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr\n"); - xhci_warn(xhci, "A Set TR Deq Ptr command is pending.\n"); - return 0; - } - ep->queued_deq_seg = deq_seg; - ep->queued_deq_ptr = deq_ptr; - return queue_command(xhci, lower_32_bits(addr) | cycle_state, - upper_32_bits(addr), trb_stream_id, - trb_slot_id | trb_ep_index | type, false); -} - -int xhci_queue_reset_ep(struct xhci_hcd *xhci, int slot_id, - unsigned int ep_index) +int xhci_queue_reset_ep(struct xhci_hcd *xhci, struct xhci_command *cmd, + int slot_id, unsigned int ep_index, + enum xhci_ep_reset_type reset_type) { u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); - u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); + u32 trb_ep_index = EP_INDEX_FOR_TRB(ep_index); u32 type = TRB_TYPE(TRB_RESET_EP); - return queue_command(xhci, 0, 0, 0, trb_slot_id | trb_ep_index | type, - false); + if (reset_type == EP_SOFT_RESET) + type |= TRB_TSP; + + return queue_command(xhci, cmd, 0, 0, 0, + trb_slot_id | trb_ep_index | type, false); } |