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-rw-r--r--drivers/misc/sgi-xp/xpc_sn2.c2459
1 files changed, 0 insertions, 2459 deletions
diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c
deleted file mode 100644
index 0ae69b9390ce..000000000000
--- a/drivers/misc/sgi-xp/xpc_sn2.c
+++ /dev/null
@@ -1,2459 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (c) 2008-2009 Silicon Graphics, Inc. All Rights Reserved.
- */
-
-/*
- * Cross Partition Communication (XPC) sn2-based functions.
- *
- * Architecture specific implementation of common functions.
- *
- */
-
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <asm/uncached.h>
-#include <asm/sn/mspec.h>
-#include <asm/sn/sn_sal.h>
-#include "xpc.h"
-
-/*
- * Define the number of u64s required to represent all the C-brick nasids
- * as a bitmap. The cross-partition kernel modules deal only with
- * C-brick nasids, thus the need for bitmaps which don't account for
- * odd-numbered (non C-brick) nasids.
- */
-#define XPC_MAX_PHYSNODES_SN2 (MAX_NUMALINK_NODES / 2)
-#define XP_NASID_MASK_BYTES_SN2 ((XPC_MAX_PHYSNODES_SN2 + 7) / 8)
-#define XP_NASID_MASK_WORDS_SN2 ((XPC_MAX_PHYSNODES_SN2 + 63) / 64)
-
-/*
- * Memory for XPC's amo variables is allocated by the MSPEC driver. These
- * pages are located in the lowest granule. The lowest granule uses 4k pages
- * for cached references and an alternate TLB handler to never provide a
- * cacheable mapping for the entire region. This will prevent speculative
- * reading of cached copies of our lines from being issued which will cause
- * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64
- * amo variables (based on XP_MAX_NPARTITIONS_SN2) to identify the senders of
- * NOTIFY IRQs, 128 amo variables (based on XP_NASID_MASK_WORDS_SN2) to identify
- * the senders of ACTIVATE IRQs, 1 amo variable to identify which remote
- * partitions (i.e., XPCs) consider themselves currently engaged with the
- * local XPC and 1 amo variable to request partition deactivation.
- */
-#define XPC_NOTIFY_IRQ_AMOS_SN2 0
-#define XPC_ACTIVATE_IRQ_AMOS_SN2 (XPC_NOTIFY_IRQ_AMOS_SN2 + \
- XP_MAX_NPARTITIONS_SN2)
-#define XPC_ENGAGED_PARTITIONS_AMO_SN2 (XPC_ACTIVATE_IRQ_AMOS_SN2 + \
- XP_NASID_MASK_WORDS_SN2)
-#define XPC_DEACTIVATE_REQUEST_AMO_SN2 (XPC_ENGAGED_PARTITIONS_AMO_SN2 + 1)
-
-/*
- * Buffer used to store a local copy of portions of a remote partition's
- * reserved page (either its header and part_nasids mask, or its vars).
- */
-static void *xpc_remote_copy_buffer_base_sn2;
-static char *xpc_remote_copy_buffer_sn2;
-
-static struct xpc_vars_sn2 *xpc_vars_sn2;
-static struct xpc_vars_part_sn2 *xpc_vars_part_sn2;
-
-static int
-xpc_setup_partitions_sn2(void)
-{
- /* nothing needs to be done */
- return 0;
-}
-
-static void
-xpc_teardown_partitions_sn2(void)
-{
- /* nothing needs to be done */
-}
-
-/* SH_IPI_ACCESS shub register value on startup */
-static u64 xpc_sh1_IPI_access_sn2;
-static u64 xpc_sh2_IPI_access0_sn2;
-static u64 xpc_sh2_IPI_access1_sn2;
-static u64 xpc_sh2_IPI_access2_sn2;
-static u64 xpc_sh2_IPI_access3_sn2;
-
-/*
- * Change protections to allow IPI operations.
- */
-static void
-xpc_allow_IPI_ops_sn2(void)
-{
- int node;
- int nasid;
-
- /* !!! The following should get moved into SAL. */
- if (is_shub2()) {
- xpc_sh2_IPI_access0_sn2 =
- (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS0));
- xpc_sh2_IPI_access1_sn2 =
- (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS1));
- xpc_sh2_IPI_access2_sn2 =
- (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS2));
- xpc_sh2_IPI_access3_sn2 =
- (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS3));
-
- for_each_online_node(node) {
- nasid = cnodeid_to_nasid(node);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
- -1UL);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
- -1UL);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
- -1UL);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
- -1UL);
- }
- } else {
- xpc_sh1_IPI_access_sn2 =
- (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH1_IPI_ACCESS));
-
- for_each_online_node(node) {
- nasid = cnodeid_to_nasid(node);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
- -1UL);
- }
- }
-}
-
-/*
- * Restrict protections to disallow IPI operations.
- */
-static void
-xpc_disallow_IPI_ops_sn2(void)
-{
- int node;
- int nasid;
-
- /* !!! The following should get moved into SAL. */
- if (is_shub2()) {
- for_each_online_node(node) {
- nasid = cnodeid_to_nasid(node);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
- xpc_sh2_IPI_access0_sn2);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
- xpc_sh2_IPI_access1_sn2);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
- xpc_sh2_IPI_access2_sn2);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
- xpc_sh2_IPI_access3_sn2);
- }
- } else {
- for_each_online_node(node) {
- nasid = cnodeid_to_nasid(node);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
- xpc_sh1_IPI_access_sn2);
- }
- }
-}
-
-/*
- * The following set of functions are used for the sending and receiving of
- * IRQs (also known as IPIs). There are two flavors of IRQs, one that is
- * associated with partition activity (SGI_XPC_ACTIVATE) and the other that
- * is associated with channel activity (SGI_XPC_NOTIFY).
- */
-
-static u64
-xpc_receive_IRQ_amo_sn2(struct amo *amo)
-{
- return FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_CLEAR);
-}
-
-static enum xp_retval
-xpc_send_IRQ_sn2(struct amo *amo, u64 flag, int nasid, int phys_cpuid,
- int vector)
-{
- int ret = 0;
- unsigned long irq_flags;
-
- local_irq_save(irq_flags);
-
- FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, flag);
- sn_send_IPI_phys(nasid, phys_cpuid, vector, 0);
-
- /*
- * We must always use the nofault function regardless of whether we
- * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
- * didn't, we'd never know that the other partition is down and would
- * keep sending IRQs and amos to it until the heartbeat times out.
- */
- ret = xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->variable),
- xp_nofault_PIOR_target));
-
- local_irq_restore(irq_flags);
-
- return (ret == 0) ? xpSuccess : xpPioReadError;
-}
-
-static struct amo *
-xpc_init_IRQ_amo_sn2(int index)
-{
- struct amo *amo = xpc_vars_sn2->amos_page + index;
-
- (void)xpc_receive_IRQ_amo_sn2(amo); /* clear amo variable */
- return amo;
-}
-
-/*
- * Functions associated with SGI_XPC_ACTIVATE IRQ.
- */
-
-/*
- * Notify the heartbeat check thread that an activate IRQ has been received.
- */
-static irqreturn_t
-xpc_handle_activate_IRQ_sn2(int irq, void *dev_id)
-{
- unsigned long irq_flags;
-
- spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
- xpc_activate_IRQ_rcvd++;
- spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
-
- wake_up_interruptible(&xpc_activate_IRQ_wq);
- return IRQ_HANDLED;
-}
-
-/*
- * Flag the appropriate amo variable and send an IRQ to the specified node.
- */
-static void
-xpc_send_activate_IRQ_sn2(unsigned long amos_page_pa, int from_nasid,
- int to_nasid, int to_phys_cpuid)
-{
- struct amo *amos = (struct amo *)__va(amos_page_pa +
- (XPC_ACTIVATE_IRQ_AMOS_SN2 *
- sizeof(struct amo)));
-
- (void)xpc_send_IRQ_sn2(&amos[BIT_WORD(from_nasid / 2)],
- BIT_MASK(from_nasid / 2), to_nasid,
- to_phys_cpuid, SGI_XPC_ACTIVATE);
-}
-
-static void
-xpc_send_local_activate_IRQ_sn2(int from_nasid)
-{
- unsigned long irq_flags;
- struct amo *amos = (struct amo *)__va(xpc_vars_sn2->amos_page_pa +
- (XPC_ACTIVATE_IRQ_AMOS_SN2 *
- sizeof(struct amo)));
-
- /* fake the sending and receipt of an activate IRQ from remote nasid */
- FETCHOP_STORE_OP(TO_AMO((u64)&amos[BIT_WORD(from_nasid / 2)].variable),
- FETCHOP_OR, BIT_MASK(from_nasid / 2));
-
- spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
- xpc_activate_IRQ_rcvd++;
- spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
-
- wake_up_interruptible(&xpc_activate_IRQ_wq);
-}
-
-/*
- * Functions associated with SGI_XPC_NOTIFY IRQ.
- */
-
-/*
- * Check to see if any chctl flags were sent from the specified partition.
- */
-static void
-xpc_check_for_sent_chctl_flags_sn2(struct xpc_partition *part)
-{
- union xpc_channel_ctl_flags chctl;
- unsigned long irq_flags;
-
- chctl.all_flags = xpc_receive_IRQ_amo_sn2(part->sn.sn2.
- local_chctl_amo_va);
- if (chctl.all_flags == 0)
- return;
-
- spin_lock_irqsave(&part->chctl_lock, irq_flags);
- part->chctl.all_flags |= chctl.all_flags;
- spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
-
- dev_dbg(xpc_chan, "received notify IRQ from partid=%d, chctl.all_flags="
- "0x%llx\n", XPC_PARTID(part), chctl.all_flags);
-
- xpc_wakeup_channel_mgr(part);
-}
-
-/*
- * Handle the receipt of a SGI_XPC_NOTIFY IRQ by seeing whether the specified
- * partition actually sent it. Since SGI_XPC_NOTIFY IRQs may be shared by more
- * than one partition, we use an amo structure per partition to indicate
- * whether a partition has sent an IRQ or not. If it has, then wake up the
- * associated kthread to handle it.
- *
- * All SGI_XPC_NOTIFY IRQs received by XPC are the result of IRQs sent by XPC
- * running on other partitions.
- *
- * Noteworthy Arguments:
- *
- * irq - Interrupt ReQuest number. NOT USED.
- *
- * dev_id - partid of IRQ's potential sender.
- */
-static irqreturn_t
-xpc_handle_notify_IRQ_sn2(int irq, void *dev_id)
-{
- short partid = (short)(u64)dev_id;
- struct xpc_partition *part = &xpc_partitions[partid];
-
- DBUG_ON(partid < 0 || partid >= XP_MAX_NPARTITIONS_SN2);
-
- if (xpc_part_ref(part)) {
- xpc_check_for_sent_chctl_flags_sn2(part);
-
- xpc_part_deref(part);
- }
- return IRQ_HANDLED;
-}
-
-/*
- * Check to see if xpc_handle_notify_IRQ_sn2() dropped any IRQs on the floor
- * because the write to their associated amo variable completed after the IRQ
- * was received.
- */
-static void
-xpc_check_for_dropped_notify_IRQ_sn2(struct timer_list *t)
-{
- struct xpc_partition *part =
- from_timer(part, t, sn.sn2.dropped_notify_IRQ_timer);
-
- if (xpc_part_ref(part)) {
- xpc_check_for_sent_chctl_flags_sn2(part);
-
- t->expires = jiffies + XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL;
- add_timer(t);
- xpc_part_deref(part);
- }
-}
-
-/*
- * Send a notify IRQ to the remote partition that is associated with the
- * specified channel.
- */
-static void
-xpc_send_notify_IRQ_sn2(struct xpc_channel *ch, u8 chctl_flag,
- char *chctl_flag_string, unsigned long *irq_flags)
-{
- struct xpc_partition *part = &xpc_partitions[ch->partid];
- struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
- union xpc_channel_ctl_flags chctl = { 0 };
- enum xp_retval ret;
-
- if (likely(part->act_state != XPC_P_AS_DEACTIVATING)) {
- chctl.flags[ch->number] = chctl_flag;
- ret = xpc_send_IRQ_sn2(part_sn2->remote_chctl_amo_va,
- chctl.all_flags,
- part_sn2->notify_IRQ_nasid,
- part_sn2->notify_IRQ_phys_cpuid,
- SGI_XPC_NOTIFY);
- dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n",
- chctl_flag_string, ch->partid, ch->number, ret);
- if (unlikely(ret != xpSuccess)) {
- if (irq_flags != NULL)
- spin_unlock_irqrestore(&ch->lock, *irq_flags);
- XPC_DEACTIVATE_PARTITION(part, ret);
- if (irq_flags != NULL)
- spin_lock_irqsave(&ch->lock, *irq_flags);
- }
- }
-}
-
-#define XPC_SEND_NOTIFY_IRQ_SN2(_ch, _ipi_f, _irq_f) \
- xpc_send_notify_IRQ_sn2(_ch, _ipi_f, #_ipi_f, _irq_f)
-
-/*
- * Make it look like the remote partition, which is associated with the
- * specified channel, sent us a notify IRQ. This faked IRQ will be handled
- * by xpc_check_for_dropped_notify_IRQ_sn2().
- */
-static void
-xpc_send_local_notify_IRQ_sn2(struct xpc_channel *ch, u8 chctl_flag,
- char *chctl_flag_string)
-{
- struct xpc_partition *part = &xpc_partitions[ch->partid];
- union xpc_channel_ctl_flags chctl = { 0 };
-
- chctl.flags[ch->number] = chctl_flag;
- FETCHOP_STORE_OP(TO_AMO((u64)&part->sn.sn2.local_chctl_amo_va->
- variable), FETCHOP_OR, chctl.all_flags);
- dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n",
- chctl_flag_string, ch->partid, ch->number);
-}
-
-#define XPC_SEND_LOCAL_NOTIFY_IRQ_SN2(_ch, _ipi_f) \
- xpc_send_local_notify_IRQ_sn2(_ch, _ipi_f, #_ipi_f)
-
-static void
-xpc_send_chctl_closerequest_sn2(struct xpc_channel *ch,
- unsigned long *irq_flags)
-{
- struct xpc_openclose_args *args = ch->sn.sn2.local_openclose_args;
-
- args->reason = ch->reason;
- XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_CLOSEREQUEST, irq_flags);
-}
-
-static void
-xpc_send_chctl_closereply_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
-{
- XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_CLOSEREPLY, irq_flags);
-}
-
-static void
-xpc_send_chctl_openrequest_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
-{
- struct xpc_openclose_args *args = ch->sn.sn2.local_openclose_args;
-
- args->entry_size = ch->entry_size;
- args->local_nentries = ch->local_nentries;
- XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_OPENREQUEST, irq_flags);
-}
-
-static void
-xpc_send_chctl_openreply_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
-{
- struct xpc_openclose_args *args = ch->sn.sn2.local_openclose_args;
-
- args->remote_nentries = ch->remote_nentries;
- args->local_nentries = ch->local_nentries;
- args->local_msgqueue_pa = xp_pa(ch->sn.sn2.local_msgqueue);
- XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_OPENREPLY, irq_flags);
-}
-
-static void
-xpc_send_chctl_opencomplete_sn2(struct xpc_channel *ch,
- unsigned long *irq_flags)
-{
- XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_OPENCOMPLETE, irq_flags);
-}
-
-static void
-xpc_send_chctl_msgrequest_sn2(struct xpc_channel *ch)
-{
- XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_MSGREQUEST, NULL);
-}
-
-static void
-xpc_send_chctl_local_msgrequest_sn2(struct xpc_channel *ch)
-{
- XPC_SEND_LOCAL_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_MSGREQUEST);
-}
-
-static enum xp_retval
-xpc_save_remote_msgqueue_pa_sn2(struct xpc_channel *ch,
- unsigned long msgqueue_pa)
-{
- ch->sn.sn2.remote_msgqueue_pa = msgqueue_pa;
- return xpSuccess;
-}
-
-/*
- * This next set of functions are used to keep track of when a partition is
- * potentially engaged in accessing memory belonging to another partition.
- */
-
-static void
-xpc_indicate_partition_engaged_sn2(struct xpc_partition *part)
-{
- unsigned long irq_flags;
- struct amo *amo = (struct amo *)__va(part->sn.sn2.remote_amos_page_pa +
- (XPC_ENGAGED_PARTITIONS_AMO_SN2 *
- sizeof(struct amo)));
-
- local_irq_save(irq_flags);
-
- /* set bit corresponding to our partid in remote partition's amo */
- FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR,
- BIT(sn_partition_id));
-
- /*
- * We must always use the nofault function regardless of whether we
- * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
- * didn't, we'd never know that the other partition is down and would
- * keep sending IRQs and amos to it until the heartbeat times out.
- */
- (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
- variable),
- xp_nofault_PIOR_target));
-
- local_irq_restore(irq_flags);
-}
-
-static void
-xpc_indicate_partition_disengaged_sn2(struct xpc_partition *part)
-{
- struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
- unsigned long irq_flags;
- struct amo *amo = (struct amo *)__va(part_sn2->remote_amos_page_pa +
- (XPC_ENGAGED_PARTITIONS_AMO_SN2 *
- sizeof(struct amo)));
-
- local_irq_save(irq_flags);
-
- /* clear bit corresponding to our partid in remote partition's amo */
- FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
- ~BIT(sn_partition_id));
-
- /*
- * We must always use the nofault function regardless of whether we
- * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
- * didn't, we'd never know that the other partition is down and would
- * keep sending IRQs and amos to it until the heartbeat times out.
- */
- (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
- variable),
- xp_nofault_PIOR_target));
-
- local_irq_restore(irq_flags);
-
- /*
- * Send activate IRQ to get other side to see that we've cleared our
- * bit in their engaged partitions amo.
- */
- xpc_send_activate_IRQ_sn2(part_sn2->remote_amos_page_pa,
- cnodeid_to_nasid(0),
- part_sn2->activate_IRQ_nasid,
- part_sn2->activate_IRQ_phys_cpuid);
-}
-
-static void
-xpc_assume_partition_disengaged_sn2(short partid)
-{
- struct amo *amo = xpc_vars_sn2->amos_page +
- XPC_ENGAGED_PARTITIONS_AMO_SN2;
-
- /* clear bit(s) based on partid mask in our partition's amo */
- FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
- ~BIT(partid));
-}
-
-static int
-xpc_partition_engaged_sn2(short partid)
-{
- struct amo *amo = xpc_vars_sn2->amos_page +
- XPC_ENGAGED_PARTITIONS_AMO_SN2;
-
- /* our partition's amo variable ANDed with partid mask */
- return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) &
- BIT(partid)) != 0;
-}
-
-static int
-xpc_any_partition_engaged_sn2(void)
-{
- struct amo *amo = xpc_vars_sn2->amos_page +
- XPC_ENGAGED_PARTITIONS_AMO_SN2;
-
- /* our partition's amo variable */
- return FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) != 0;
-}
-
-/* original protection values for each node */
-static u64 xpc_prot_vec_sn2[MAX_NUMNODES];
-
-/*
- * Change protections to allow amo operations on non-Shub 1.1 systems.
- */
-static enum xp_retval
-xpc_allow_amo_ops_sn2(struct amo *amos_page)
-{
- enum xp_retval ret = xpSuccess;
-
- /*
- * On SHUB 1.1, we cannot call sn_change_memprotect() since the BIST
- * collides with memory operations. On those systems we call
- * xpc_allow_amo_ops_shub_wars_1_1_sn2() instead.
- */
- if (!enable_shub_wars_1_1())
- ret = xp_expand_memprotect(ia64_tpa((u64)amos_page), PAGE_SIZE);
-
- return ret;
-}
-
-/*
- * Change protections to allow amo operations on Shub 1.1 systems.
- */
-static void
-xpc_allow_amo_ops_shub_wars_1_1_sn2(void)
-{
- int node;
- int nasid;
-
- if (!enable_shub_wars_1_1())
- return;
-
- for_each_online_node(node) {
- nasid = cnodeid_to_nasid(node);
- /* save current protection values */
- xpc_prot_vec_sn2[node] =
- (u64)HUB_L((u64 *)GLOBAL_MMR_ADDR(nasid,
- SH1_MD_DQLP_MMR_DIR_PRIVEC0));
- /* open up everything */
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid,
- SH1_MD_DQLP_MMR_DIR_PRIVEC0),
- -1UL);
- HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid,
- SH1_MD_DQRP_MMR_DIR_PRIVEC0),
- -1UL);
- }
-}
-
-static enum xp_retval
-xpc_get_partition_rsvd_page_pa_sn2(void *buf, u64 *cookie, unsigned long *rp_pa,
- size_t *len)
-{
- s64 status;
- enum xp_retval ret;
-
- status = sn_partition_reserved_page_pa((u64)buf, cookie,
- (u64 *)rp_pa, (u64 *)len);
- if (status == SALRET_OK)
- ret = xpSuccess;
- else if (status == SALRET_MORE_PASSES)
- ret = xpNeedMoreInfo;
- else
- ret = xpSalError;
-
- return ret;
-}
-
-
-static int
-xpc_setup_rsvd_page_sn2(struct xpc_rsvd_page *rp)
-{
- struct amo *amos_page;
- int i;
- int ret;
-
- xpc_vars_sn2 = XPC_RP_VARS(rp);
-
- rp->sn.sn2.vars_pa = xp_pa(xpc_vars_sn2);
-
- /* vars_part array follows immediately after vars */
- xpc_vars_part_sn2 = (struct xpc_vars_part_sn2 *)((u8 *)XPC_RP_VARS(rp) +
- XPC_RP_VARS_SIZE);
-
- /*
- * Before clearing xpc_vars_sn2, see if a page of amos had been
- * previously allocated. If not we'll need to allocate one and set
- * permissions so that cross-partition amos are allowed.
- *
- * The allocated amo page needs MCA reporting to remain disabled after
- * XPC has unloaded. To make this work, we keep a copy of the pointer
- * to this page (i.e., amos_page) in the struct xpc_vars_sn2 structure,
- * which is pointed to by the reserved page, and re-use that saved copy
- * on subsequent loads of XPC. This amo page is never freed, and its
- * memory protections are never restricted.
- */
- amos_page = xpc_vars_sn2->amos_page;
- if (amos_page == NULL) {
- amos_page = (struct amo *)TO_AMO(uncached_alloc_page(0, 1));
- if (amos_page == NULL) {
- dev_err(xpc_part, "can't allocate page of amos\n");
- return -ENOMEM;
- }
-
- /*
- * Open up amo-R/W to cpu. This is done on Shub 1.1 systems
- * when xpc_allow_amo_ops_shub_wars_1_1_sn2() is called.
- */
- ret = xpc_allow_amo_ops_sn2(amos_page);
- if (ret != xpSuccess) {
- dev_err(xpc_part, "can't allow amo operations\n");
- uncached_free_page(__IA64_UNCACHED_OFFSET |
- TO_PHYS((u64)amos_page), 1);
- return -EPERM;
- }
- }
-
- /* clear xpc_vars_sn2 */
- memset(xpc_vars_sn2, 0, sizeof(struct xpc_vars_sn2));
-
- xpc_vars_sn2->version = XPC_V_VERSION;
- xpc_vars_sn2->activate_IRQ_nasid = cpuid_to_nasid(0);
- xpc_vars_sn2->activate_IRQ_phys_cpuid = cpu_physical_id(0);
- xpc_vars_sn2->vars_part_pa = xp_pa(xpc_vars_part_sn2);
- xpc_vars_sn2->amos_page_pa = ia64_tpa((u64)amos_page);
- xpc_vars_sn2->amos_page = amos_page; /* save for next load of XPC */
-
- /* clear xpc_vars_part_sn2 */
- memset((u64 *)xpc_vars_part_sn2, 0, sizeof(struct xpc_vars_part_sn2) *
- XP_MAX_NPARTITIONS_SN2);
-
- /* initialize the activate IRQ related amo variables */
- for (i = 0; i < xpc_nasid_mask_nlongs; i++)
- (void)xpc_init_IRQ_amo_sn2(XPC_ACTIVATE_IRQ_AMOS_SN2 + i);
-
- /* initialize the engaged remote partitions related amo variables */
- (void)xpc_init_IRQ_amo_sn2(XPC_ENGAGED_PARTITIONS_AMO_SN2);
- (void)xpc_init_IRQ_amo_sn2(XPC_DEACTIVATE_REQUEST_AMO_SN2);
-
- return 0;
-}
-
-static int
-xpc_hb_allowed_sn2(short partid, void *heartbeating_to_mask)
-{
- return test_bit(partid, heartbeating_to_mask);
-}
-
-static void
-xpc_allow_hb_sn2(short partid)
-{
- DBUG_ON(xpc_vars_sn2 == NULL);
- set_bit(partid, xpc_vars_sn2->heartbeating_to_mask);
-}
-
-static void
-xpc_disallow_hb_sn2(short partid)
-{
- DBUG_ON(xpc_vars_sn2 == NULL);
- clear_bit(partid, xpc_vars_sn2->heartbeating_to_mask);
-}
-
-static void
-xpc_disallow_all_hbs_sn2(void)
-{
- DBUG_ON(xpc_vars_sn2 == NULL);
- bitmap_zero(xpc_vars_sn2->heartbeating_to_mask, xp_max_npartitions);
-}
-
-static void
-xpc_increment_heartbeat_sn2(void)
-{
- xpc_vars_sn2->heartbeat++;
-}
-
-static void
-xpc_offline_heartbeat_sn2(void)
-{
- xpc_increment_heartbeat_sn2();
- xpc_vars_sn2->heartbeat_offline = 1;
-}
-
-static void
-xpc_online_heartbeat_sn2(void)
-{
- xpc_increment_heartbeat_sn2();
- xpc_vars_sn2->heartbeat_offline = 0;
-}
-
-static void
-xpc_heartbeat_init_sn2(void)
-{
- DBUG_ON(xpc_vars_sn2 == NULL);
-
- bitmap_zero(xpc_vars_sn2->heartbeating_to_mask, XP_MAX_NPARTITIONS_SN2);
- xpc_online_heartbeat_sn2();
-}
-
-static void
-xpc_heartbeat_exit_sn2(void)
-{
- xpc_offline_heartbeat_sn2();
-}
-
-static enum xp_retval
-xpc_get_remote_heartbeat_sn2(struct xpc_partition *part)
-{
- struct xpc_vars_sn2 *remote_vars;
- enum xp_retval ret;
-
- remote_vars = (struct xpc_vars_sn2 *)xpc_remote_copy_buffer_sn2;
-
- /* pull the remote vars structure that contains the heartbeat */
- ret = xp_remote_memcpy(xp_pa(remote_vars),
- part->sn.sn2.remote_vars_pa,
- XPC_RP_VARS_SIZE);
- if (ret != xpSuccess)
- return ret;
-
- dev_dbg(xpc_part, "partid=%d, heartbeat=%lld, last_heartbeat=%lld, "
- "heartbeat_offline=%lld, HB_mask[0]=0x%lx\n", XPC_PARTID(part),
- remote_vars->heartbeat, part->last_heartbeat,
- remote_vars->heartbeat_offline,
- remote_vars->heartbeating_to_mask[0]);
-
- if ((remote_vars->heartbeat == part->last_heartbeat &&
- !remote_vars->heartbeat_offline) ||
- !xpc_hb_allowed_sn2(sn_partition_id,
- remote_vars->heartbeating_to_mask)) {
- ret = xpNoHeartbeat;
- } else {
- part->last_heartbeat = remote_vars->heartbeat;
- }
-
- return ret;
-}
-
-/*
- * Get a copy of the remote partition's XPC variables from the reserved page.
- *
- * remote_vars points to a buffer that is cacheline aligned for BTE copies and
- * assumed to be of size XPC_RP_VARS_SIZE.
- */
-static enum xp_retval
-xpc_get_remote_vars_sn2(unsigned long remote_vars_pa,
- struct xpc_vars_sn2 *remote_vars)
-{
- enum xp_retval ret;
-
- if (remote_vars_pa == 0)
- return xpVarsNotSet;
-
- /* pull over the cross partition variables */
- ret = xp_remote_memcpy(xp_pa(remote_vars), remote_vars_pa,
- XPC_RP_VARS_SIZE);
- if (ret != xpSuccess)
- return ret;
-
- if (XPC_VERSION_MAJOR(remote_vars->version) !=
- XPC_VERSION_MAJOR(XPC_V_VERSION)) {
- return xpBadVersion;
- }
-
- return xpSuccess;
-}
-
-static void
-xpc_request_partition_activation_sn2(struct xpc_rsvd_page *remote_rp,
- unsigned long remote_rp_pa, int nasid)
-{
- xpc_send_local_activate_IRQ_sn2(nasid);
-}
-
-static void
-xpc_request_partition_reactivation_sn2(struct xpc_partition *part)
-{
- xpc_send_local_activate_IRQ_sn2(part->sn.sn2.activate_IRQ_nasid);
-}
-
-static void
-xpc_request_partition_deactivation_sn2(struct xpc_partition *part)
-{
- struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
- unsigned long irq_flags;
- struct amo *amo = (struct amo *)__va(part_sn2->remote_amos_page_pa +
- (XPC_DEACTIVATE_REQUEST_AMO_SN2 *
- sizeof(struct amo)));
-
- local_irq_save(irq_flags);
-
- /* set bit corresponding to our partid in remote partition's amo */
- FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR,
- BIT(sn_partition_id));
-
- /*
- * We must always use the nofault function regardless of whether we
- * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
- * didn't, we'd never know that the other partition is down and would
- * keep sending IRQs and amos to it until the heartbeat times out.
- */
- (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
- variable),
- xp_nofault_PIOR_target));
-
- local_irq_restore(irq_flags);
-
- /*
- * Send activate IRQ to get other side to see that we've set our
- * bit in their deactivate request amo.
- */
- xpc_send_activate_IRQ_sn2(part_sn2->remote_amos_page_pa,
- cnodeid_to_nasid(0),
- part_sn2->activate_IRQ_nasid,
- part_sn2->activate_IRQ_phys_cpuid);
-}
-
-static void
-xpc_cancel_partition_deactivation_request_sn2(struct xpc_partition *part)
-{
- unsigned long irq_flags;
- struct amo *amo = (struct amo *)__va(part->sn.sn2.remote_amos_page_pa +
- (XPC_DEACTIVATE_REQUEST_AMO_SN2 *
- sizeof(struct amo)));
-
- local_irq_save(irq_flags);
-
- /* clear bit corresponding to our partid in remote partition's amo */
- FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
- ~BIT(sn_partition_id));
-
- /*
- * We must always use the nofault function regardless of whether we
- * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
- * didn't, we'd never know that the other partition is down and would
- * keep sending IRQs and amos to it until the heartbeat times out.
- */
- (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
- variable),
- xp_nofault_PIOR_target));
-
- local_irq_restore(irq_flags);
-}
-
-static int
-xpc_partition_deactivation_requested_sn2(short partid)
-{
- struct amo *amo = xpc_vars_sn2->amos_page +
- XPC_DEACTIVATE_REQUEST_AMO_SN2;
-
- /* our partition's amo variable ANDed with partid mask */
- return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) &
- BIT(partid)) != 0;
-}
-
-/*
- * Update the remote partition's info.
- */
-static void
-xpc_update_partition_info_sn2(struct xpc_partition *part, u8 remote_rp_version,
- unsigned long *remote_rp_ts_jiffies,
- unsigned long remote_rp_pa,
- unsigned long remote_vars_pa,
- struct xpc_vars_sn2 *remote_vars)
-{
- struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
-
- part->remote_rp_version = remote_rp_version;
- dev_dbg(xpc_part, " remote_rp_version = 0x%016x\n",
- part->remote_rp_version);
-
- part->remote_rp_ts_jiffies = *remote_rp_ts_jiffies;
- dev_dbg(xpc_part, " remote_rp_ts_jiffies = 0x%016lx\n",
- part->remote_rp_ts_jiffies);
-
- part->remote_rp_pa = remote_rp_pa;
- dev_dbg(xpc_part, " remote_rp_pa = 0x%016lx\n", part->remote_rp_pa);
-
- part_sn2->remote_vars_pa = remote_vars_pa;
- dev_dbg(xpc_part, " remote_vars_pa = 0x%016lx\n",
- part_sn2->remote_vars_pa);
-
- part->last_heartbeat = remote_vars->heartbeat - 1;
- dev_dbg(xpc_part, " last_heartbeat = 0x%016llx\n",
- part->last_heartbeat);
-
- part_sn2->remote_vars_part_pa = remote_vars->vars_part_pa;
- dev_dbg(xpc_part, " remote_vars_part_pa = 0x%016lx\n",
- part_sn2->remote_vars_part_pa);
-
- part_sn2->activate_IRQ_nasid = remote_vars->activate_IRQ_nasid;
- dev_dbg(xpc_part, " activate_IRQ_nasid = 0x%x\n",
- part_sn2->activate_IRQ_nasid);
-
- part_sn2->activate_IRQ_phys_cpuid =
- remote_vars->activate_IRQ_phys_cpuid;
- dev_dbg(xpc_part, " activate_IRQ_phys_cpuid = 0x%x\n",
- part_sn2->activate_IRQ_phys_cpuid);
-
- part_sn2->remote_amos_page_pa = remote_vars->amos_page_pa;
- dev_dbg(xpc_part, " remote_amos_page_pa = 0x%lx\n",
- part_sn2->remote_amos_page_pa);
-
- part_sn2->remote_vars_version = remote_vars->version;
- dev_dbg(xpc_part, " remote_vars_version = 0x%x\n",
- part_sn2->remote_vars_version);
-}
-
-/*
- * Prior code has determined the nasid which generated a activate IRQ.
- * Inspect that nasid to determine if its partition needs to be activated
- * or deactivated.
- *
- * A partition is considered "awaiting activation" if our partition
- * flags indicate it is not active and it has a heartbeat. A
- * partition is considered "awaiting deactivation" if our partition
- * flags indicate it is active but it has no heartbeat or it is not
- * sending its heartbeat to us.
- *
- * To determine the heartbeat, the remote nasid must have a properly
- * initialized reserved page.
- */
-static void
-xpc_identify_activate_IRQ_req_sn2(int nasid)
-{
- struct xpc_rsvd_page *remote_rp;
- struct xpc_vars_sn2 *remote_vars;
- unsigned long remote_rp_pa;
- unsigned long remote_vars_pa;
- int remote_rp_version;
- int reactivate = 0;
- unsigned long remote_rp_ts_jiffies = 0;
- short partid;
- struct xpc_partition *part;
- struct xpc_partition_sn2 *part_sn2;
- enum xp_retval ret;
-
- /* pull over the reserved page structure */
-
- remote_rp = (struct xpc_rsvd_page *)xpc_remote_copy_buffer_sn2;
-
- ret = xpc_get_remote_rp(nasid, NULL, remote_rp, &remote_rp_pa);
- if (ret != xpSuccess) {
- dev_warn(xpc_part, "unable to get reserved page from nasid %d, "
- "which sent interrupt, reason=%d\n", nasid, ret);
- return;
- }
-
- remote_vars_pa = remote_rp->sn.sn2.vars_pa;
- remote_rp_version = remote_rp->version;
- remote_rp_ts_jiffies = remote_rp->ts_jiffies;
-
- partid = remote_rp->SAL_partid;
- part = &xpc_partitions[partid];
- part_sn2 = &part->sn.sn2;
-
- /* pull over the cross partition variables */
-
- remote_vars = (struct xpc_vars_sn2 *)xpc_remote_copy_buffer_sn2;
-
- ret = xpc_get_remote_vars_sn2(remote_vars_pa, remote_vars);
- if (ret != xpSuccess) {
- dev_warn(xpc_part, "unable to get XPC variables from nasid %d, "
- "which sent interrupt, reason=%d\n", nasid, ret);
-
- XPC_DEACTIVATE_PARTITION(part, ret);
- return;
- }
-
- part->activate_IRQ_rcvd++;
-
- dev_dbg(xpc_part, "partid for nasid %d is %d; IRQs = %d; HB = "
- "%lld:0x%lx\n", (int)nasid, (int)partid,
- part->activate_IRQ_rcvd,
- remote_vars->heartbeat, remote_vars->heartbeating_to_mask[0]);
-
- if (xpc_partition_disengaged(part) &&
- part->act_state == XPC_P_AS_INACTIVE) {
-
- xpc_update_partition_info_sn2(part, remote_rp_version,
- &remote_rp_ts_jiffies,
- remote_rp_pa, remote_vars_pa,
- remote_vars);
-
- if (xpc_partition_deactivation_requested_sn2(partid)) {
- /*
- * Other side is waiting on us to deactivate even though
- * we already have.
- */
- return;
- }
-
- xpc_activate_partition(part);
- return;
- }
-
- DBUG_ON(part->remote_rp_version == 0);
- DBUG_ON(part_sn2->remote_vars_version == 0);
-
- if (remote_rp_ts_jiffies != part->remote_rp_ts_jiffies) {
-
- /* the other side rebooted */
-
- DBUG_ON(xpc_partition_engaged_sn2(partid));
- DBUG_ON(xpc_partition_deactivation_requested_sn2(partid));
-
- xpc_update_partition_info_sn2(part, remote_rp_version,
- &remote_rp_ts_jiffies,
- remote_rp_pa, remote_vars_pa,
- remote_vars);
- reactivate = 1;
- }
-
- if (part->disengage_timeout > 0 && !xpc_partition_disengaged(part)) {
- /* still waiting on other side to disengage from us */
- return;
- }
-
- if (reactivate)
- XPC_DEACTIVATE_PARTITION(part, xpReactivating);
- else if (xpc_partition_deactivation_requested_sn2(partid))
- XPC_DEACTIVATE_PARTITION(part, xpOtherGoingDown);
-}
-
-/*
- * Loop through the activation amo variables and process any bits
- * which are set. Each bit indicates a nasid sending a partition
- * activation or deactivation request.
- *
- * Return #of IRQs detected.
- */
-int
-xpc_identify_activate_IRQ_sender_sn2(void)
-{
- int l;
- int b;
- unsigned long nasid_mask_long;
- u64 nasid; /* remote nasid */
- int n_IRQs_detected = 0;
- struct amo *act_amos;
-
- act_amos = xpc_vars_sn2->amos_page + XPC_ACTIVATE_IRQ_AMOS_SN2;
-
- /* scan through activate amo variables looking for non-zero entries */
- for (l = 0; l < xpc_nasid_mask_nlongs; l++) {
-
- if (xpc_exiting)
- break;
-
- nasid_mask_long = xpc_receive_IRQ_amo_sn2(&act_amos[l]);
-
- b = find_first_bit(&nasid_mask_long, BITS_PER_LONG);
- if (b >= BITS_PER_LONG) {
- /* no IRQs from nasids in this amo variable */
- continue;
- }
-
- dev_dbg(xpc_part, "amo[%d] gave back 0x%lx\n", l,
- nasid_mask_long);
-
- /*
- * If this nasid has been added to the machine since
- * our partition was reset, this will retain the
- * remote nasid in our reserved pages machine mask.
- * This is used in the event of module reload.
- */
- xpc_mach_nasids[l] |= nasid_mask_long;
-
- /* locate the nasid(s) which sent interrupts */
-
- do {
- n_IRQs_detected++;
- nasid = (l * BITS_PER_LONG + b) * 2;
- dev_dbg(xpc_part, "interrupt from nasid %lld\n", nasid);
- xpc_identify_activate_IRQ_req_sn2(nasid);
-
- b = find_next_bit(&nasid_mask_long, BITS_PER_LONG,
- b + 1);
- } while (b < BITS_PER_LONG);
- }
- return n_IRQs_detected;
-}
-
-static void
-xpc_process_activate_IRQ_rcvd_sn2(void)
-{
- unsigned long irq_flags;
- int n_IRQs_expected;
- int n_IRQs_detected;
-
- spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
- n_IRQs_expected = xpc_activate_IRQ_rcvd;
- xpc_activate_IRQ_rcvd = 0;
- spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
-
- n_IRQs_detected = xpc_identify_activate_IRQ_sender_sn2();
- if (n_IRQs_detected < n_IRQs_expected) {
- /* retry once to help avoid missing amo */
- (void)xpc_identify_activate_IRQ_sender_sn2();
- }
-}
-
-/*
- * Setup the channel structures that are sn2 specific.
- */
-static enum xp_retval
-xpc_setup_ch_structures_sn2(struct xpc_partition *part)
-{
- struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
- struct xpc_channel_sn2 *ch_sn2;
- enum xp_retval retval;
- int ret;
- int cpuid;
- int ch_number;
- struct timer_list *timer;
- short partid = XPC_PARTID(part);
-
- /* allocate all the required GET/PUT values */
-
- part_sn2->local_GPs =
- xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE, GFP_KERNEL,
- &part_sn2->local_GPs_base);
- if (part_sn2->local_GPs == NULL) {
- dev_err(xpc_chan, "can't get memory for local get/put "
- "values\n");
- return xpNoMemory;
- }
-
- part_sn2->remote_GPs =
- xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE, GFP_KERNEL,
- &part_sn2->remote_GPs_base);
- if (part_sn2->remote_GPs == NULL) {
- dev_err(xpc_chan, "can't get memory for remote get/put "
- "values\n");
- retval = xpNoMemory;
- goto out_1;
- }
-
- part_sn2->remote_GPs_pa = 0;
-
- /* allocate all the required open and close args */
-
- part_sn2->local_openclose_args =
- xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE,
- GFP_KERNEL, &part_sn2->
- local_openclose_args_base);
- if (part_sn2->local_openclose_args == NULL) {
- dev_err(xpc_chan, "can't get memory for local connect args\n");
- retval = xpNoMemory;
- goto out_2;
- }
-
- part_sn2->remote_openclose_args_pa = 0;
-
- part_sn2->local_chctl_amo_va = xpc_init_IRQ_amo_sn2(partid);
-
- part_sn2->notify_IRQ_nasid = 0;
- part_sn2->notify_IRQ_phys_cpuid = 0;
- part_sn2->remote_chctl_amo_va = NULL;
-
- sprintf(part_sn2->notify_IRQ_owner, "xpc%02d", partid);
- ret = request_irq(SGI_XPC_NOTIFY, xpc_handle_notify_IRQ_sn2,
- IRQF_SHARED, part_sn2->notify_IRQ_owner,
- (void *)(u64)partid);
- if (ret != 0) {
- dev_err(xpc_chan, "can't register NOTIFY IRQ handler, "
- "errno=%d\n", -ret);
- retval = xpLackOfResources;
- goto out_3;
- }
-
- /* Setup a timer to check for dropped notify IRQs */
- timer = &part_sn2->dropped_notify_IRQ_timer;
- timer_setup(timer, xpc_check_for_dropped_notify_IRQ_sn2, 0);
- timer->expires = jiffies + XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL;
- add_timer(timer);
-
- for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
- ch_sn2 = &part->channels[ch_number].sn.sn2;
-
- ch_sn2->local_GP = &part_sn2->local_GPs[ch_number];
- ch_sn2->local_openclose_args =
- &part_sn2->local_openclose_args[ch_number];
-
- mutex_init(&ch_sn2->msg_to_pull_mutex);
- }
-
- /*
- * Setup the per partition specific variables required by the
- * remote partition to establish channel connections with us.
- *
- * The setting of the magic # indicates that these per partition
- * specific variables are ready to be used.
- */
- xpc_vars_part_sn2[partid].GPs_pa = xp_pa(part_sn2->local_GPs);
- xpc_vars_part_sn2[partid].openclose_args_pa =
- xp_pa(part_sn2->local_openclose_args);
- xpc_vars_part_sn2[partid].chctl_amo_pa =
- xp_pa(part_sn2->local_chctl_amo_va);
- cpuid = raw_smp_processor_id(); /* any CPU in this partition will do */
- xpc_vars_part_sn2[partid].notify_IRQ_nasid = cpuid_to_nasid(cpuid);
- xpc_vars_part_sn2[partid].notify_IRQ_phys_cpuid =
- cpu_physical_id(cpuid);
- xpc_vars_part_sn2[partid].nchannels = part->nchannels;
- xpc_vars_part_sn2[partid].magic = XPC_VP_MAGIC1_SN2;
-
- return xpSuccess;
-
- /* setup of ch structures failed */
-out_3:
- kfree(part_sn2->local_openclose_args_base);
- part_sn2->local_openclose_args = NULL;
-out_2:
- kfree(part_sn2->remote_GPs_base);
- part_sn2->remote_GPs = NULL;
-out_1:
- kfree(part_sn2->local_GPs_base);
- part_sn2->local_GPs = NULL;
- return retval;
-}
-
-/*
- * Teardown the channel structures that are sn2 specific.
- */
-static void
-xpc_teardown_ch_structures_sn2(struct xpc_partition *part)
-{
- struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
- short partid = XPC_PARTID(part);
-
- /*
- * Indicate that the variables specific to the remote partition are no
- * longer available for its use.
- */
- xpc_vars_part_sn2[partid].magic = 0;
-
- /* in case we've still got outstanding timers registered... */
- del_timer_sync(&part_sn2->dropped_notify_IRQ_timer);
- free_irq(SGI_XPC_NOTIFY, (void *)(u64)partid);
-
- kfree(part_sn2->local_openclose_args_base);
- part_sn2->local_openclose_args = NULL;
- kfree(part_sn2->remote_GPs_base);
- part_sn2->remote_GPs = NULL;
- kfree(part_sn2->local_GPs_base);
- part_sn2->local_GPs = NULL;
- part_sn2->local_chctl_amo_va = NULL;
-}
-
-/*
- * Create a wrapper that hides the underlying mechanism for pulling a cacheline
- * (or multiple cachelines) from a remote partition.
- *
- * src_pa must be a cacheline aligned physical address on the remote partition.
- * dst must be a cacheline aligned virtual address on this partition.
- * cnt must be cacheline sized
- */
-/* ??? Replace this function by call to xp_remote_memcpy() or bte_copy()? */
-static enum xp_retval
-xpc_pull_remote_cachelines_sn2(struct xpc_partition *part, void *dst,
- const unsigned long src_pa, size_t cnt)
-{
- enum xp_retval ret;
-
- DBUG_ON(src_pa != L1_CACHE_ALIGN(src_pa));
- DBUG_ON((unsigned long)dst != L1_CACHE_ALIGN((unsigned long)dst));
- DBUG_ON(cnt != L1_CACHE_ALIGN(cnt));
-
- if (part->act_state == XPC_P_AS_DEACTIVATING)
- return part->reason;
-
- ret = xp_remote_memcpy(xp_pa(dst), src_pa, cnt);
- if (ret != xpSuccess) {
- dev_dbg(xpc_chan, "xp_remote_memcpy() from partition %d failed,"
- " ret=%d\n", XPC_PARTID(part), ret);
- }
- return ret;
-}
-
-/*
- * Pull the remote per partition specific variables from the specified
- * partition.
- */
-static enum xp_retval
-xpc_pull_remote_vars_part_sn2(struct xpc_partition *part)
-{
- struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
- u8 buffer[L1_CACHE_BYTES * 2];
- struct xpc_vars_part_sn2 *pulled_entry_cacheline =
- (struct xpc_vars_part_sn2 *)L1_CACHE_ALIGN((u64)buffer);
- struct xpc_vars_part_sn2 *pulled_entry;
- unsigned long remote_entry_cacheline_pa;
- unsigned long remote_entry_pa;
- short partid = XPC_PARTID(part);
- enum xp_retval ret;
-
- /* pull the cacheline that contains the variables we're interested in */
-
- DBUG_ON(part_sn2->remote_vars_part_pa !=
- L1_CACHE_ALIGN(part_sn2->remote_vars_part_pa));
- DBUG_ON(sizeof(struct xpc_vars_part_sn2) != L1_CACHE_BYTES / 2);
-
- remote_entry_pa = part_sn2->remote_vars_part_pa +
- sn_partition_id * sizeof(struct xpc_vars_part_sn2);
-
- remote_entry_cacheline_pa = (remote_entry_pa & ~(L1_CACHE_BYTES - 1));
-
- pulled_entry = (struct xpc_vars_part_sn2 *)((u64)pulled_entry_cacheline
- + (remote_entry_pa &
- (L1_CACHE_BYTES - 1)));
-
- ret = xpc_pull_remote_cachelines_sn2(part, pulled_entry_cacheline,
- remote_entry_cacheline_pa,
- L1_CACHE_BYTES);
- if (ret != xpSuccess) {
- dev_dbg(xpc_chan, "failed to pull XPC vars_part from "
- "partition %d, ret=%d\n", partid, ret);
- return ret;
- }
-
- /* see if they've been set up yet */
-
- if (pulled_entry->magic != XPC_VP_MAGIC1_SN2 &&
- pulled_entry->magic != XPC_VP_MAGIC2_SN2) {
-
- if (pulled_entry->magic != 0) {
- dev_dbg(xpc_chan, "partition %d's XPC vars_part for "
- "partition %d has bad magic value (=0x%llx)\n",
- partid, sn_partition_id, pulled_entry->magic);
- return xpBadMagic;
- }
-
- /* they've not been initialized yet */
- return xpRetry;
- }
-
- if (xpc_vars_part_sn2[partid].magic == XPC_VP_MAGIC1_SN2) {
-
- /* validate the variables */
-
- if (pulled_entry->GPs_pa == 0 ||
- pulled_entry->openclose_args_pa == 0 ||
- pulled_entry->chctl_amo_pa == 0) {
-
- dev_err(xpc_chan, "partition %d's XPC vars_part for "
- "partition %d are not valid\n", partid,
- sn_partition_id);
- return xpInvalidAddress;
- }
-
- /* the variables we imported look to be valid */
-
- part_sn2->remote_GPs_pa = pulled_entry->GPs_pa;
- part_sn2->remote_openclose_args_pa =
- pulled_entry->openclose_args_pa;
- part_sn2->remote_chctl_amo_va =
- (struct amo *)__va(pulled_entry->chctl_amo_pa);
- part_sn2->notify_IRQ_nasid = pulled_entry->notify_IRQ_nasid;
- part_sn2->notify_IRQ_phys_cpuid =
- pulled_entry->notify_IRQ_phys_cpuid;
-
- if (part->nchannels > pulled_entry->nchannels)
- part->nchannels = pulled_entry->nchannels;
-
- /* let the other side know that we've pulled their variables */
-
- xpc_vars_part_sn2[partid].magic = XPC_VP_MAGIC2_SN2;
- }
-
- if (pulled_entry->magic == XPC_VP_MAGIC1_SN2)
- return xpRetry;
-
- return xpSuccess;
-}
-
-/*
- * Establish first contact with the remote partititon. This involves pulling
- * the XPC per partition variables from the remote partition and waiting for
- * the remote partition to pull ours.
- */
-static enum xp_retval
-xpc_make_first_contact_sn2(struct xpc_partition *part)
-{
- struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
- enum xp_retval ret;
-
- /*
- * Register the remote partition's amos with SAL so it can handle
- * and cleanup errors within that address range should the remote
- * partition go down. We don't unregister this range because it is
- * difficult to tell when outstanding writes to the remote partition
- * are finished and thus when it is safe to unregister. This should
- * not result in wasted space in the SAL xp_addr_region table because
- * we should get the same page for remote_amos_page_pa after module
- * reloads and system reboots.
- */
- if (sn_register_xp_addr_region(part_sn2->remote_amos_page_pa,
- PAGE_SIZE, 1) < 0) {
- dev_warn(xpc_part, "xpc_activating(%d) failed to register "
- "xp_addr region\n", XPC_PARTID(part));
-
- ret = xpPhysAddrRegFailed;
- XPC_DEACTIVATE_PARTITION(part, ret);
- return ret;
- }
-
- /*
- * Send activate IRQ to get other side to activate if they've not
- * already begun to do so.
- */
- xpc_send_activate_IRQ_sn2(part_sn2->remote_amos_page_pa,
- cnodeid_to_nasid(0),
- part_sn2->activate_IRQ_nasid,
- part_sn2->activate_IRQ_phys_cpuid);
-
- while ((ret = xpc_pull_remote_vars_part_sn2(part)) != xpSuccess) {
- if (ret != xpRetry) {
- XPC_DEACTIVATE_PARTITION(part, ret);
- return ret;
- }
-
- dev_dbg(xpc_part, "waiting to make first contact with "
- "partition %d\n", XPC_PARTID(part));
-
- /* wait a 1/4 of a second or so */
- (void)msleep_interruptible(250);
-
- if (part->act_state == XPC_P_AS_DEACTIVATING)
- return part->reason;
- }
-
- return xpSuccess;
-}
-
-/*
- * Get the chctl flags and pull the openclose args and/or remote GPs as needed.
- */
-static u64
-xpc_get_chctl_all_flags_sn2(struct xpc_partition *part)
-{
- struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
- unsigned long irq_flags;
- union xpc_channel_ctl_flags chctl;
- enum xp_retval ret;
-
- /*
- * See if there are any chctl flags to be handled.
- */
-
- spin_lock_irqsave(&part->chctl_lock, irq_flags);
- chctl = part->chctl;
- if (chctl.all_flags != 0)
- part->chctl.all_flags = 0;
-
- spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
-
- if (xpc_any_openclose_chctl_flags_set(&chctl)) {
- ret = xpc_pull_remote_cachelines_sn2(part, part->
- remote_openclose_args,
- part_sn2->
- remote_openclose_args_pa,
- XPC_OPENCLOSE_ARGS_SIZE);
- if (ret != xpSuccess) {
- XPC_DEACTIVATE_PARTITION(part, ret);
-
- dev_dbg(xpc_chan, "failed to pull openclose args from "
- "partition %d, ret=%d\n", XPC_PARTID(part),
- ret);
-
- /* don't bother processing chctl flags anymore */
- chctl.all_flags = 0;
- }
- }
-
- if (xpc_any_msg_chctl_flags_set(&chctl)) {
- ret = xpc_pull_remote_cachelines_sn2(part, part_sn2->remote_GPs,
- part_sn2->remote_GPs_pa,
- XPC_GP_SIZE);
- if (ret != xpSuccess) {
- XPC_DEACTIVATE_PARTITION(part, ret);
-
- dev_dbg(xpc_chan, "failed to pull GPs from partition "
- "%d, ret=%d\n", XPC_PARTID(part), ret);
-
- /* don't bother processing chctl flags anymore */
- chctl.all_flags = 0;
- }
- }
-
- return chctl.all_flags;
-}
-
-/*
- * Allocate the local message queue and the notify queue.
- */
-static enum xp_retval
-xpc_allocate_local_msgqueue_sn2(struct xpc_channel *ch)
-{
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- unsigned long irq_flags;
- int nentries;
- size_t nbytes;
-
- for (nentries = ch->local_nentries; nentries > 0; nentries--) {
-
- nbytes = nentries * ch->entry_size;
- ch_sn2->local_msgqueue =
- xpc_kzalloc_cacheline_aligned(nbytes, GFP_KERNEL,
- &ch_sn2->local_msgqueue_base);
- if (ch_sn2->local_msgqueue == NULL)
- continue;
-
- nbytes = nentries * sizeof(struct xpc_notify_sn2);
- ch_sn2->notify_queue = kzalloc(nbytes, GFP_KERNEL);
- if (ch_sn2->notify_queue == NULL) {
- kfree(ch_sn2->local_msgqueue_base);
- ch_sn2->local_msgqueue = NULL;
- continue;
- }
-
- spin_lock_irqsave(&ch->lock, irq_flags);
- if (nentries < ch->local_nentries) {
- dev_dbg(xpc_chan, "nentries=%d local_nentries=%d, "
- "partid=%d, channel=%d\n", nentries,
- ch->local_nentries, ch->partid, ch->number);
-
- ch->local_nentries = nentries;
- }
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return xpSuccess;
- }
-
- dev_dbg(xpc_chan, "can't get memory for local message queue and notify "
- "queue, partid=%d, channel=%d\n", ch->partid, ch->number);
- return xpNoMemory;
-}
-
-/*
- * Allocate the cached remote message queue.
- */
-static enum xp_retval
-xpc_allocate_remote_msgqueue_sn2(struct xpc_channel *ch)
-{
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- unsigned long irq_flags;
- int nentries;
- size_t nbytes;
-
- DBUG_ON(ch->remote_nentries <= 0);
-
- for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
-
- nbytes = nentries * ch->entry_size;
- ch_sn2->remote_msgqueue =
- xpc_kzalloc_cacheline_aligned(nbytes, GFP_KERNEL, &ch_sn2->
- remote_msgqueue_base);
- if (ch_sn2->remote_msgqueue == NULL)
- continue;
-
- spin_lock_irqsave(&ch->lock, irq_flags);
- if (nentries < ch->remote_nentries) {
- dev_dbg(xpc_chan, "nentries=%d remote_nentries=%d, "
- "partid=%d, channel=%d\n", nentries,
- ch->remote_nentries, ch->partid, ch->number);
-
- ch->remote_nentries = nentries;
- }
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return xpSuccess;
- }
-
- dev_dbg(xpc_chan, "can't get memory for cached remote message queue, "
- "partid=%d, channel=%d\n", ch->partid, ch->number);
- return xpNoMemory;
-}
-
-/*
- * Allocate message queues and other stuff associated with a channel.
- *
- * Note: Assumes all of the channel sizes are filled in.
- */
-static enum xp_retval
-xpc_setup_msg_structures_sn2(struct xpc_channel *ch)
-{
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- enum xp_retval ret;
-
- DBUG_ON(ch->flags & XPC_C_SETUP);
-
- ret = xpc_allocate_local_msgqueue_sn2(ch);
- if (ret == xpSuccess) {
-
- ret = xpc_allocate_remote_msgqueue_sn2(ch);
- if (ret != xpSuccess) {
- kfree(ch_sn2->local_msgqueue_base);
- ch_sn2->local_msgqueue = NULL;
- kfree(ch_sn2->notify_queue);
- ch_sn2->notify_queue = NULL;
- }
- }
- return ret;
-}
-
-/*
- * Free up message queues and other stuff that were allocated for the specified
- * channel.
- */
-static void
-xpc_teardown_msg_structures_sn2(struct xpc_channel *ch)
-{
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
-
- lockdep_assert_held(&ch->lock);
-
- ch_sn2->remote_msgqueue_pa = 0;
-
- ch_sn2->local_GP->get = 0;
- ch_sn2->local_GP->put = 0;
- ch_sn2->remote_GP.get = 0;
- ch_sn2->remote_GP.put = 0;
- ch_sn2->w_local_GP.get = 0;
- ch_sn2->w_local_GP.put = 0;
- ch_sn2->w_remote_GP.get = 0;
- ch_sn2->w_remote_GP.put = 0;
- ch_sn2->next_msg_to_pull = 0;
-
- if (ch->flags & XPC_C_SETUP) {
- dev_dbg(xpc_chan, "ch->flags=0x%x, partid=%d, channel=%d\n",
- ch->flags, ch->partid, ch->number);
-
- kfree(ch_sn2->local_msgqueue_base);
- ch_sn2->local_msgqueue = NULL;
- kfree(ch_sn2->remote_msgqueue_base);
- ch_sn2->remote_msgqueue = NULL;
- kfree(ch_sn2->notify_queue);
- ch_sn2->notify_queue = NULL;
- }
-}
-
-/*
- * Notify those who wanted to be notified upon delivery of their message.
- */
-static void
-xpc_notify_senders_sn2(struct xpc_channel *ch, enum xp_retval reason, s64 put)
-{
- struct xpc_notify_sn2 *notify;
- u8 notify_type;
- s64 get = ch->sn.sn2.w_remote_GP.get - 1;
-
- while (++get < put && atomic_read(&ch->n_to_notify) > 0) {
-
- notify = &ch->sn.sn2.notify_queue[get % ch->local_nentries];
-
- /*
- * See if the notify entry indicates it was associated with
- * a message who's sender wants to be notified. It is possible
- * that it is, but someone else is doing or has done the
- * notification.
- */
- notify_type = notify->type;
- if (notify_type == 0 ||
- cmpxchg(&notify->type, notify_type, 0) != notify_type) {
- continue;
- }
-
- DBUG_ON(notify_type != XPC_N_CALL);
-
- atomic_dec(&ch->n_to_notify);
-
- if (notify->func != NULL) {
- dev_dbg(xpc_chan, "notify->func() called, notify=0x%p "
- "msg_number=%lld partid=%d channel=%d\n",
- (void *)notify, get, ch->partid, ch->number);
-
- notify->func(reason, ch->partid, ch->number,
- notify->key);
-
- dev_dbg(xpc_chan, "notify->func() returned, notify=0x%p"
- " msg_number=%lld partid=%d channel=%d\n",
- (void *)notify, get, ch->partid, ch->number);
- }
- }
-}
-
-static void
-xpc_notify_senders_of_disconnect_sn2(struct xpc_channel *ch)
-{
- xpc_notify_senders_sn2(ch, ch->reason, ch->sn.sn2.w_local_GP.put);
-}
-
-/*
- * Clear some of the msg flags in the local message queue.
- */
-static inline void
-xpc_clear_local_msgqueue_flags_sn2(struct xpc_channel *ch)
-{
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- struct xpc_msg_sn2 *msg;
- s64 get;
-
- get = ch_sn2->w_remote_GP.get;
- do {
- msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->local_msgqueue +
- (get % ch->local_nentries) *
- ch->entry_size);
- DBUG_ON(!(msg->flags & XPC_M_SN2_READY));
- msg->flags = 0;
- } while (++get < ch_sn2->remote_GP.get);
-}
-
-/*
- * Clear some of the msg flags in the remote message queue.
- */
-static inline void
-xpc_clear_remote_msgqueue_flags_sn2(struct xpc_channel *ch)
-{
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- struct xpc_msg_sn2 *msg;
- s64 put, remote_nentries = ch->remote_nentries;
-
- /* flags are zeroed when the buffer is allocated */
- if (ch_sn2->remote_GP.put < remote_nentries)
- return;
-
- put = max(ch_sn2->w_remote_GP.put, remote_nentries);
- do {
- msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->remote_msgqueue +
- (put % remote_nentries) *
- ch->entry_size);
- DBUG_ON(!(msg->flags & XPC_M_SN2_READY));
- DBUG_ON(!(msg->flags & XPC_M_SN2_DONE));
- DBUG_ON(msg->number != put - remote_nentries);
- msg->flags = 0;
- } while (++put < ch_sn2->remote_GP.put);
-}
-
-static int
-xpc_n_of_deliverable_payloads_sn2(struct xpc_channel *ch)
-{
- return ch->sn.sn2.w_remote_GP.put - ch->sn.sn2.w_local_GP.get;
-}
-
-static void
-xpc_process_msg_chctl_flags_sn2(struct xpc_partition *part, int ch_number)
-{
- struct xpc_channel *ch = &part->channels[ch_number];
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- int npayloads_sent;
-
- ch_sn2->remote_GP = part->sn.sn2.remote_GPs[ch_number];
-
- /* See what, if anything, has changed for each connected channel */
-
- xpc_msgqueue_ref(ch);
-
- if (ch_sn2->w_remote_GP.get == ch_sn2->remote_GP.get &&
- ch_sn2->w_remote_GP.put == ch_sn2->remote_GP.put) {
- /* nothing changed since GPs were last pulled */
- xpc_msgqueue_deref(ch);
- return;
- }
-
- if (!(ch->flags & XPC_C_CONNECTED)) {
- xpc_msgqueue_deref(ch);
- return;
- }
-
- /*
- * First check to see if messages recently sent by us have been
- * received by the other side. (The remote GET value will have
- * changed since we last looked at it.)
- */
-
- if (ch_sn2->w_remote_GP.get != ch_sn2->remote_GP.get) {
-
- /*
- * We need to notify any senders that want to be notified
- * that their sent messages have been received by their
- * intended recipients. We need to do this before updating
- * w_remote_GP.get so that we don't allocate the same message
- * queue entries prematurely (see xpc_allocate_msg()).
- */
- if (atomic_read(&ch->n_to_notify) > 0) {
- /*
- * Notify senders that messages sent have been
- * received and delivered by the other side.
- */
- xpc_notify_senders_sn2(ch, xpMsgDelivered,
- ch_sn2->remote_GP.get);
- }
-
- /*
- * Clear msg->flags in previously sent messages, so that
- * they're ready for xpc_allocate_msg().
- */
- xpc_clear_local_msgqueue_flags_sn2(ch);
-
- ch_sn2->w_remote_GP.get = ch_sn2->remote_GP.get;
-
- dev_dbg(xpc_chan, "w_remote_GP.get changed to %lld, partid=%d, "
- "channel=%d\n", ch_sn2->w_remote_GP.get, ch->partid,
- ch->number);
-
- /*
- * If anyone was waiting for message queue entries to become
- * available, wake them up.
- */
- if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
- wake_up(&ch->msg_allocate_wq);
- }
-
- /*
- * Now check for newly sent messages by the other side. (The remote
- * PUT value will have changed since we last looked at it.)
- */
-
- if (ch_sn2->w_remote_GP.put != ch_sn2->remote_GP.put) {
- /*
- * Clear msg->flags in previously received messages, so that
- * they're ready for xpc_get_deliverable_payload_sn2().
- */
- xpc_clear_remote_msgqueue_flags_sn2(ch);
-
- smp_wmb(); /* ensure flags have been cleared before bte_copy */
- ch_sn2->w_remote_GP.put = ch_sn2->remote_GP.put;
-
- dev_dbg(xpc_chan, "w_remote_GP.put changed to %lld, partid=%d, "
- "channel=%d\n", ch_sn2->w_remote_GP.put, ch->partid,
- ch->number);
-
- npayloads_sent = xpc_n_of_deliverable_payloads_sn2(ch);
- if (npayloads_sent > 0) {
- dev_dbg(xpc_chan, "msgs waiting to be copied and "
- "delivered=%d, partid=%d, channel=%d\n",
- npayloads_sent, ch->partid, ch->number);
-
- if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)
- xpc_activate_kthreads(ch, npayloads_sent);
- }
- }
-
- xpc_msgqueue_deref(ch);
-}
-
-static struct xpc_msg_sn2 *
-xpc_pull_remote_msg_sn2(struct xpc_channel *ch, s64 get)
-{
- struct xpc_partition *part = &xpc_partitions[ch->partid];
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- unsigned long remote_msg_pa;
- struct xpc_msg_sn2 *msg;
- u32 msg_index;
- u32 nmsgs;
- u64 msg_offset;
- enum xp_retval ret;
-
- if (mutex_lock_interruptible(&ch_sn2->msg_to_pull_mutex) != 0) {
- /* we were interrupted by a signal */
- return NULL;
- }
-
- while (get >= ch_sn2->next_msg_to_pull) {
-
- /* pull as many messages as are ready and able to be pulled */
-
- msg_index = ch_sn2->next_msg_to_pull % ch->remote_nentries;
-
- DBUG_ON(ch_sn2->next_msg_to_pull >= ch_sn2->w_remote_GP.put);
- nmsgs = ch_sn2->w_remote_GP.put - ch_sn2->next_msg_to_pull;
- if (msg_index + nmsgs > ch->remote_nentries) {
- /* ignore the ones that wrap the msg queue for now */
- nmsgs = ch->remote_nentries - msg_index;
- }
-
- msg_offset = msg_index * ch->entry_size;
- msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->remote_msgqueue +
- msg_offset);
- remote_msg_pa = ch_sn2->remote_msgqueue_pa + msg_offset;
-
- ret = xpc_pull_remote_cachelines_sn2(part, msg, remote_msg_pa,
- nmsgs * ch->entry_size);
- if (ret != xpSuccess) {
-
- dev_dbg(xpc_chan, "failed to pull %d msgs starting with"
- " msg %lld from partition %d, channel=%d, "
- "ret=%d\n", nmsgs, ch_sn2->next_msg_to_pull,
- ch->partid, ch->number, ret);
-
- XPC_DEACTIVATE_PARTITION(part, ret);
-
- mutex_unlock(&ch_sn2->msg_to_pull_mutex);
- return NULL;
- }
-
- ch_sn2->next_msg_to_pull += nmsgs;
- }
-
- mutex_unlock(&ch_sn2->msg_to_pull_mutex);
-
- /* return the message we were looking for */
- msg_offset = (get % ch->remote_nentries) * ch->entry_size;
- msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->remote_msgqueue + msg_offset);
-
- return msg;
-}
-
-/*
- * Get the next deliverable message's payload.
- */
-static void *
-xpc_get_deliverable_payload_sn2(struct xpc_channel *ch)
-{
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- struct xpc_msg_sn2 *msg;
- void *payload = NULL;
- s64 get;
-
- do {
- if (ch->flags & XPC_C_DISCONNECTING)
- break;
-
- get = ch_sn2->w_local_GP.get;
- smp_rmb(); /* guarantee that .get loads before .put */
- if (get == ch_sn2->w_remote_GP.put)
- break;
-
- /* There are messages waiting to be pulled and delivered.
- * We need to try to secure one for ourselves. We'll do this
- * by trying to increment w_local_GP.get and hope that no one
- * else beats us to it. If they do, we'll we'll simply have
- * to try again for the next one.
- */
-
- if (cmpxchg(&ch_sn2->w_local_GP.get, get, get + 1) == get) {
- /* we got the entry referenced by get */
-
- dev_dbg(xpc_chan, "w_local_GP.get changed to %lld, "
- "partid=%d, channel=%d\n", get + 1,
- ch->partid, ch->number);
-
- /* pull the message from the remote partition */
-
- msg = xpc_pull_remote_msg_sn2(ch, get);
-
- if (msg != NULL) {
- DBUG_ON(msg->number != get);
- DBUG_ON(msg->flags & XPC_M_SN2_DONE);
- DBUG_ON(!(msg->flags & XPC_M_SN2_READY));
-
- payload = &msg->payload;
- }
- break;
- }
-
- } while (1);
-
- return payload;
-}
-
-/*
- * Now we actually send the messages that are ready to be sent by advancing
- * the local message queue's Put value and then send a chctl msgrequest to the
- * recipient partition.
- */
-static void
-xpc_send_msgs_sn2(struct xpc_channel *ch, s64 initial_put)
-{
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- struct xpc_msg_sn2 *msg;
- s64 put = initial_put + 1;
- int send_msgrequest = 0;
-
- while (1) {
-
- while (1) {
- if (put == ch_sn2->w_local_GP.put)
- break;
-
- msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->
- local_msgqueue + (put %
- ch->local_nentries) *
- ch->entry_size);
-
- if (!(msg->flags & XPC_M_SN2_READY))
- break;
-
- put++;
- }
-
- if (put == initial_put) {
- /* nothing's changed */
- break;
- }
-
- if (cmpxchg_rel(&ch_sn2->local_GP->put, initial_put, put) !=
- initial_put) {
- /* someone else beat us to it */
- DBUG_ON(ch_sn2->local_GP->put < initial_put);
- break;
- }
-
- /* we just set the new value of local_GP->put */
-
- dev_dbg(xpc_chan, "local_GP->put changed to %lld, partid=%d, "
- "channel=%d\n", put, ch->partid, ch->number);
-
- send_msgrequest = 1;
-
- /*
- * We need to ensure that the message referenced by
- * local_GP->put is not XPC_M_SN2_READY or that local_GP->put
- * equals w_local_GP.put, so we'll go have a look.
- */
- initial_put = put;
- }
-
- if (send_msgrequest)
- xpc_send_chctl_msgrequest_sn2(ch);
-}
-
-/*
- * Allocate an entry for a message from the message queue associated with the
- * specified channel.
- */
-static enum xp_retval
-xpc_allocate_msg_sn2(struct xpc_channel *ch, u32 flags,
- struct xpc_msg_sn2 **address_of_msg)
-{
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- struct xpc_msg_sn2 *msg;
- enum xp_retval ret;
- s64 put;
-
- /*
- * Get the next available message entry from the local message queue.
- * If none are available, we'll make sure that we grab the latest
- * GP values.
- */
- ret = xpTimeout;
-
- while (1) {
-
- put = ch_sn2->w_local_GP.put;
- smp_rmb(); /* guarantee that .put loads before .get */
- if (put - ch_sn2->w_remote_GP.get < ch->local_nentries) {
-
- /* There are available message entries. We need to try
- * to secure one for ourselves. We'll do this by trying
- * to increment w_local_GP.put as long as someone else
- * doesn't beat us to it. If they do, we'll have to
- * try again.
- */
- if (cmpxchg(&ch_sn2->w_local_GP.put, put, put + 1) ==
- put) {
- /* we got the entry referenced by put */
- break;
- }
- continue; /* try again */
- }
-
- /*
- * There aren't any available msg entries at this time.
- *
- * In waiting for a message entry to become available,
- * we set a timeout in case the other side is not sending
- * completion interrupts. This lets us fake a notify IRQ
- * that will cause the notify IRQ handler to fetch the latest
- * GP values as if an interrupt was sent by the other side.
- */
- if (ret == xpTimeout)
- xpc_send_chctl_local_msgrequest_sn2(ch);
-
- if (flags & XPC_NOWAIT)
- return xpNoWait;
-
- ret = xpc_allocate_msg_wait(ch);
- if (ret != xpInterrupted && ret != xpTimeout)
- return ret;
- }
-
- /* get the message's address and initialize it */
- msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->local_msgqueue +
- (put % ch->local_nentries) *
- ch->entry_size);
-
- DBUG_ON(msg->flags != 0);
- msg->number = put;
-
- dev_dbg(xpc_chan, "w_local_GP.put changed to %lld; msg=0x%p, "
- "msg_number=%lld, partid=%d, channel=%d\n", put + 1,
- (void *)msg, msg->number, ch->partid, ch->number);
-
- *address_of_msg = msg;
- return xpSuccess;
-}
-
-/*
- * Common code that does the actual sending of the message by advancing the
- * local message queue's Put value and sends a chctl msgrequest to the
- * partition the message is being sent to.
- */
-static enum xp_retval
-xpc_send_payload_sn2(struct xpc_channel *ch, u32 flags, void *payload,
- u16 payload_size, u8 notify_type, xpc_notify_func func,
- void *key)
-{
- enum xp_retval ret = xpSuccess;
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- struct xpc_msg_sn2 *msg = msg;
- struct xpc_notify_sn2 *notify = notify;
- s64 msg_number;
- s64 put;
-
- DBUG_ON(notify_type == XPC_N_CALL && func == NULL);
-
- if (XPC_MSG_SIZE(payload_size) > ch->entry_size)
- return xpPayloadTooBig;
-
- xpc_msgqueue_ref(ch);
-
- if (ch->flags & XPC_C_DISCONNECTING) {
- ret = ch->reason;
- goto out_1;
- }
- if (!(ch->flags & XPC_C_CONNECTED)) {
- ret = xpNotConnected;
- goto out_1;
- }
-
- ret = xpc_allocate_msg_sn2(ch, flags, &msg);
- if (ret != xpSuccess)
- goto out_1;
-
- msg_number = msg->number;
-
- if (notify_type != 0) {
- /*
- * Tell the remote side to send an ACK interrupt when the
- * message has been delivered.
- */
- msg->flags |= XPC_M_SN2_INTERRUPT;
-
- atomic_inc(&ch->n_to_notify);
-
- notify = &ch_sn2->notify_queue[msg_number % ch->local_nentries];
- notify->func = func;
- notify->key = key;
- notify->type = notify_type;
-
- /* ??? Is a mb() needed here? */
-
- if (ch->flags & XPC_C_DISCONNECTING) {
- /*
- * An error occurred between our last error check and
- * this one. We will try to clear the type field from
- * the notify entry. If we succeed then
- * xpc_disconnect_channel() didn't already process
- * the notify entry.
- */
- if (cmpxchg(&notify->type, notify_type, 0) ==
- notify_type) {
- atomic_dec(&ch->n_to_notify);
- ret = ch->reason;
- }
- goto out_1;
- }
- }
-
- memcpy(&msg->payload, payload, payload_size);
-
- msg->flags |= XPC_M_SN2_READY;
-
- /*
- * The preceding store of msg->flags must occur before the following
- * load of local_GP->put.
- */
- smp_mb();
-
- /* see if the message is next in line to be sent, if so send it */
-
- put = ch_sn2->local_GP->put;
- if (put == msg_number)
- xpc_send_msgs_sn2(ch, put);
-
-out_1:
- xpc_msgqueue_deref(ch);
- return ret;
-}
-
-/*
- * Now we actually acknowledge the messages that have been delivered and ack'd
- * by advancing the cached remote message queue's Get value and if requested
- * send a chctl msgrequest to the message sender's partition.
- *
- * If a message has XPC_M_SN2_INTERRUPT set, send an interrupt to the partition
- * that sent the message.
- */
-static void
-xpc_acknowledge_msgs_sn2(struct xpc_channel *ch, s64 initial_get, u8 msg_flags)
-{
- struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
- struct xpc_msg_sn2 *msg;
- s64 get = initial_get + 1;
- int send_msgrequest = 0;
-
- while (1) {
-
- while (1) {
- if (get == ch_sn2->w_local_GP.get)
- break;
-
- msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->
- remote_msgqueue + (get %
- ch->remote_nentries) *
- ch->entry_size);
-
- if (!(msg->flags & XPC_M_SN2_DONE))
- break;
-
- msg_flags |= msg->flags;
- get++;
- }
-
- if (get == initial_get) {
- /* nothing's changed */
- break;
- }
-
- if (cmpxchg_rel(&ch_sn2->local_GP->get, initial_get, get) !=
- initial_get) {
- /* someone else beat us to it */
- DBUG_ON(ch_sn2->local_GP->get <= initial_get);
- break;
- }
-
- /* we just set the new value of local_GP->get */
-
- dev_dbg(xpc_chan, "local_GP->get changed to %lld, partid=%d, "
- "channel=%d\n", get, ch->partid, ch->number);
-
- send_msgrequest = (msg_flags & XPC_M_SN2_INTERRUPT);
-
- /*
- * We need to ensure that the message referenced by
- * local_GP->get is not XPC_M_SN2_DONE or that local_GP->get
- * equals w_local_GP.get, so we'll go have a look.
- */
- initial_get = get;
- }
-
- if (send_msgrequest)
- xpc_send_chctl_msgrequest_sn2(ch);
-}
-
-static void
-xpc_received_payload_sn2(struct xpc_channel *ch, void *payload)
-{
- struct xpc_msg_sn2 *msg;
- s64 msg_number;
- s64 get;
-
- msg = container_of(payload, struct xpc_msg_sn2, payload);
- msg_number = msg->number;
-
- dev_dbg(xpc_chan, "msg=0x%p, msg_number=%lld, partid=%d, channel=%d\n",
- (void *)msg, msg_number, ch->partid, ch->number);
-
- DBUG_ON((((u64)msg - (u64)ch->sn.sn2.remote_msgqueue) / ch->entry_size) !=
- msg_number % ch->remote_nentries);
- DBUG_ON(!(msg->flags & XPC_M_SN2_READY));
- DBUG_ON(msg->flags & XPC_M_SN2_DONE);
-
- msg->flags |= XPC_M_SN2_DONE;
-
- /*
- * The preceding store of msg->flags must occur before the following
- * load of local_GP->get.
- */
- smp_mb();
-
- /*
- * See if this message is next in line to be acknowledged as having
- * been delivered.
- */
- get = ch->sn.sn2.local_GP->get;
- if (get == msg_number)
- xpc_acknowledge_msgs_sn2(ch, get, msg->flags);
-}
-
-static struct xpc_arch_operations xpc_arch_ops_sn2 = {
- .setup_partitions = xpc_setup_partitions_sn2,
- .teardown_partitions = xpc_teardown_partitions_sn2,
- .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_sn2,
- .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_sn2,
- .setup_rsvd_page = xpc_setup_rsvd_page_sn2,
-
- .allow_hb = xpc_allow_hb_sn2,
- .disallow_hb = xpc_disallow_hb_sn2,
- .disallow_all_hbs = xpc_disallow_all_hbs_sn2,
- .increment_heartbeat = xpc_increment_heartbeat_sn2,
- .offline_heartbeat = xpc_offline_heartbeat_sn2,
- .online_heartbeat = xpc_online_heartbeat_sn2,
- .heartbeat_init = xpc_heartbeat_init_sn2,
- .heartbeat_exit = xpc_heartbeat_exit_sn2,
- .get_remote_heartbeat = xpc_get_remote_heartbeat_sn2,
-
- .request_partition_activation =
- xpc_request_partition_activation_sn2,
- .request_partition_reactivation =
- xpc_request_partition_reactivation_sn2,
- .request_partition_deactivation =
- xpc_request_partition_deactivation_sn2,
- .cancel_partition_deactivation_request =
- xpc_cancel_partition_deactivation_request_sn2,
-
- .setup_ch_structures = xpc_setup_ch_structures_sn2,
- .teardown_ch_structures = xpc_teardown_ch_structures_sn2,
-
- .make_first_contact = xpc_make_first_contact_sn2,
-
- .get_chctl_all_flags = xpc_get_chctl_all_flags_sn2,
- .send_chctl_closerequest = xpc_send_chctl_closerequest_sn2,
- .send_chctl_closereply = xpc_send_chctl_closereply_sn2,
- .send_chctl_openrequest = xpc_send_chctl_openrequest_sn2,
- .send_chctl_openreply = xpc_send_chctl_openreply_sn2,
- .send_chctl_opencomplete = xpc_send_chctl_opencomplete_sn2,
- .process_msg_chctl_flags = xpc_process_msg_chctl_flags_sn2,
-
- .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_sn2,
-
- .setup_msg_structures = xpc_setup_msg_structures_sn2,
- .teardown_msg_structures = xpc_teardown_msg_structures_sn2,
-
- .indicate_partition_engaged = xpc_indicate_partition_engaged_sn2,
- .indicate_partition_disengaged = xpc_indicate_partition_disengaged_sn2,
- .partition_engaged = xpc_partition_engaged_sn2,
- .any_partition_engaged = xpc_any_partition_engaged_sn2,
- .assume_partition_disengaged = xpc_assume_partition_disengaged_sn2,
-
- .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_sn2,
- .send_payload = xpc_send_payload_sn2,
- .get_deliverable_payload = xpc_get_deliverable_payload_sn2,
- .received_payload = xpc_received_payload_sn2,
- .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_sn2,
-};
-
-int
-xpc_init_sn2(void)
-{
- int ret;
- size_t buf_size;
-
- xpc_arch_ops = xpc_arch_ops_sn2;
-
- if (offsetof(struct xpc_msg_sn2, payload) > XPC_MSG_HDR_MAX_SIZE) {
- dev_err(xpc_part, "header portion of struct xpc_msg_sn2 is "
- "larger than %d\n", XPC_MSG_HDR_MAX_SIZE);
- return -E2BIG;
- }
-
- buf_size = max(XPC_RP_VARS_SIZE,
- XPC_RP_HEADER_SIZE + XP_NASID_MASK_BYTES_SN2);
- xpc_remote_copy_buffer_sn2 = xpc_kmalloc_cacheline_aligned(buf_size,
- GFP_KERNEL,
- &xpc_remote_copy_buffer_base_sn2);
- if (xpc_remote_copy_buffer_sn2 == NULL) {
- dev_err(xpc_part, "can't get memory for remote copy buffer\n");
- return -ENOMEM;
- }
-
- /* open up protections for IPI and [potentially] amo operations */
- xpc_allow_IPI_ops_sn2();
- xpc_allow_amo_ops_shub_wars_1_1_sn2();
-
- /*
- * This is safe to do before the xpc_hb_checker thread has started
- * because the handler releases a wait queue. If an interrupt is
- * received before the thread is waiting, it will not go to sleep,
- * but rather immediately process the interrupt.
- */
- ret = request_irq(SGI_XPC_ACTIVATE, xpc_handle_activate_IRQ_sn2, 0,
- "xpc hb", NULL);
- if (ret != 0) {
- dev_err(xpc_part, "can't register ACTIVATE IRQ handler, "
- "errno=%d\n", -ret);
- xpc_disallow_IPI_ops_sn2();
- kfree(xpc_remote_copy_buffer_base_sn2);
- }
- return ret;
-}
-
-void
-xpc_exit_sn2(void)
-{
- free_irq(SGI_XPC_ACTIVATE, NULL);
- xpc_disallow_IPI_ops_sn2();
- kfree(xpc_remote_copy_buffer_base_sn2);
-}