diff options
Diffstat (limited to 'drivers/gpu/host1x/syncpt.c')
| -rw-r--r-- | drivers/gpu/host1x/syncpt.c | 551 |
1 files changed, 352 insertions, 199 deletions
diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c index 409745b949db..acc7d82e0585 100644 --- a/drivers/gpu/host1x/syncpt.c +++ b/drivers/gpu/host1x/syncpt.c @@ -1,23 +1,13 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Tegra host1x Syncpoints * - * Copyright (c) 2010-2013, NVIDIA Corporation. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>. + * Copyright (c) 2010-2015, NVIDIA Corporation. */ #include <linux/module.h> #include <linux/device.h> +#include <linux/dma-fence.h> #include <linux/slab.h> #include <trace/events/host1x.h> @@ -30,44 +20,115 @@ #define SYNCPT_CHECK_PERIOD (2 * HZ) #define MAX_STUCK_CHECK_COUNT 15 -static struct host1x_syncpt *_host1x_syncpt_alloc(struct host1x *host, - struct device *dev, - bool client_managed) +static struct host1x_syncpt_base * +host1x_syncpt_base_request(struct host1x *host) { - int i; - struct host1x_syncpt *sp = host->syncpt; - char *name; + struct host1x_syncpt_base *bases = host->bases; + unsigned int i; - for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++) - ; + for (i = 0; i < host->info->nb_bases; i++) + if (!bases[i].requested) + break; - if (i >= host->info->nb_pts) + if (i >= host->info->nb_bases) return NULL; - name = kasprintf(GFP_KERNEL, "%02d-%s", sp->id, - dev ? dev_name(dev) : NULL); + bases[i].requested = true; + return &bases[i]; +} + +static void host1x_syncpt_base_free(struct host1x_syncpt_base *base) +{ + if (base) + base->requested = false; +} + +/** + * host1x_syncpt_alloc() - allocate a syncpoint + * @host: host1x device data + * @flags: bitfield of HOST1X_SYNCPT_* flags + * @name: name for the syncpoint for use in debug prints + * + * Allocates a hardware syncpoint for the caller's use. The caller then has + * the sole authority to mutate the syncpoint's value until it is freed again. + * + * If no free syncpoints are available, or a NULL name was specified, returns + * NULL. + */ +struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host, + unsigned long flags, + const char *name) +{ + struct host1x_syncpt *sp = host->syncpt; + char *full_name; + unsigned int i; + if (!name) return NULL; - sp->dev = dev; - sp->name = name; - sp->client_managed = client_managed; + mutex_lock(&host->syncpt_mutex); + + for (i = 0; i < host->info->nb_pts && kref_read(&sp->ref); i++, sp++) + ; + if (i >= host->info->nb_pts) + goto unlock; + + if (flags & HOST1X_SYNCPT_HAS_BASE) { + sp->base = host1x_syncpt_base_request(host); + if (!sp->base) + goto unlock; + } + + full_name = kasprintf(GFP_KERNEL, "%u-%s", sp->id, name); + if (!full_name) + goto free_base; + + sp->name = full_name; + + if (flags & HOST1X_SYNCPT_CLIENT_MANAGED) + sp->client_managed = true; + else + sp->client_managed = false; + + kref_init(&sp->ref); + + mutex_unlock(&host->syncpt_mutex); return sp; + +free_base: + host1x_syncpt_base_free(sp->base); + sp->base = NULL; +unlock: + mutex_unlock(&host->syncpt_mutex); + return NULL; } +EXPORT_SYMBOL(host1x_syncpt_alloc); +/** + * host1x_syncpt_id() - retrieve syncpoint ID + * @sp: host1x syncpoint + * + * Given a pointer to a struct host1x_syncpt, retrieves its ID. This ID is + * often used as a value to program into registers that control how hardware + * blocks interact with syncpoints. + */ u32 host1x_syncpt_id(struct host1x_syncpt *sp) { return sp->id; } +EXPORT_SYMBOL(host1x_syncpt_id); -/* - * Updates the value sent to hardware. +/** + * host1x_syncpt_incr_max() - update the value sent to hardware + * @sp: host1x syncpoint + * @incrs: number of increments */ u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs) { return (u32)atomic_add_return(incrs, &sp->max_val); } +EXPORT_SYMBOL(host1x_syncpt_incr_max); /* * Write cached syncpoint and waitbase values to hardware. @@ -75,12 +136,23 @@ u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs) void host1x_syncpt_restore(struct host1x *host) { struct host1x_syncpt *sp_base = host->syncpt; - u32 i; + unsigned int i; - for (i = 0; i < host1x_syncpt_nb_pts(host); i++) + for (i = 0; i < host1x_syncpt_nb_pts(host); i++) { + /* + * Unassign syncpt from channels for purposes of Tegra186 + * syncpoint protection. This prevents any channel from + * accessing it until it is reassigned. + */ + host1x_hw_syncpt_assign_to_channel(host, sp_base + i, NULL); host1x_hw_syncpt_restore(host, sp_base + i); + } + for (i = 0; i < host1x_syncpt_nb_bases(host); i++) host1x_hw_syncpt_restore_wait_base(host, sp_base + i); + + host1x_hw_syncpt_enable_protection(host); + wmb(); } @@ -91,7 +163,7 @@ void host1x_syncpt_restore(struct host1x *host) void host1x_syncpt_save(struct host1x *host) { struct host1x_syncpt *sp_base = host->syncpt; - u32 i; + unsigned int i; for (i = 0; i < host1x_syncpt_nb_pts(host); i++) { if (host1x_syncpt_client_managed(sp_base + i)) @@ -111,6 +183,7 @@ void host1x_syncpt_save(struct host1x *host) u32 host1x_syncpt_load(struct host1x_syncpt *sp) { u32 val; + val = host1x_hw_syncpt_load(sp->host, sp); trace_host1x_syncpt_load_min(sp->id, val); @@ -122,117 +195,71 @@ u32 host1x_syncpt_load(struct host1x_syncpt *sp) */ u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp) { - u32 val; host1x_hw_syncpt_load_wait_base(sp->host, sp); - val = sp->base_val; - return val; + + return sp->base_val; } -/* - * Increment syncpoint value from cpu, updating cache +/** + * host1x_syncpt_incr() - increment syncpoint value from CPU, updating cache + * @sp: host1x syncpoint */ int host1x_syncpt_incr(struct host1x_syncpt *sp) { return host1x_hw_syncpt_cpu_incr(sp->host, sp); } - -/* - * Updated sync point form hardware, and returns true if syncpoint is expired, - * false if we may need to wait - */ -static bool syncpt_load_min_is_expired(struct host1x_syncpt *sp, u32 thresh) -{ - host1x_hw_syncpt_load(sp->host, sp); - return host1x_syncpt_is_expired(sp, thresh); -} - -/* - * Main entrypoint for syncpoint value waits. +EXPORT_SYMBOL(host1x_syncpt_incr); + +/** + * host1x_syncpt_wait() - wait for a syncpoint to reach a given value + * @sp: host1x syncpoint + * @thresh: threshold + * @timeout: maximum time to wait for the syncpoint to reach the given value + * @value: return location for the syncpoint value */ int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout, - u32 *value) + u32 *value) { - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); - void *ref; - struct host1x_waitlist *waiter; - int err = 0, check_count = 0; - u32 val; + struct dma_fence *fence; + long wait_err; + + host1x_hw_syncpt_load(sp->host, sp); if (value) - *value = 0; + *value = host1x_syncpt_load(sp); - /* first check cache */ - if (host1x_syncpt_is_expired(sp, thresh)) { - if (value) - *value = host1x_syncpt_load(sp); + if (host1x_syncpt_is_expired(sp, thresh)) return 0; - } - /* try to read from register */ - val = host1x_hw_syncpt_load(sp->host, sp); - if (host1x_syncpt_is_expired(sp, thresh)) { - if (value) - *value = val; - goto done; - } - - if (!timeout) { - err = -EAGAIN; - goto done; - } - - /* allocate a waiter */ - waiter = kzalloc(sizeof(*waiter), GFP_KERNEL); - if (!waiter) { - err = -ENOMEM; - goto done; - } - - /* schedule a wakeup when the syncpoint value is reached */ - err = host1x_intr_add_action(sp->host, sp->id, thresh, - HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE, - &wq, waiter, &ref); - if (err) - goto done; - - err = -EAGAIN; - /* Caller-specified timeout may be impractically low */ if (timeout < 0) timeout = LONG_MAX; + else if (timeout == 0) + return -EAGAIN; - /* wait for the syncpoint, or timeout, or signal */ - while (timeout) { - long check = min_t(long, SYNCPT_CHECK_PERIOD, timeout); - int remain = wait_event_interruptible_timeout(wq, - syncpt_load_min_is_expired(sp, thresh), - check); - if (remain > 0 || host1x_syncpt_is_expired(sp, thresh)) { - if (value) - *value = host1x_syncpt_load(sp); - err = 0; - break; - } - if (remain < 0) { - err = remain; - break; - } - timeout -= check; - if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) { - dev_warn(sp->host->dev, - "%s: syncpoint id %d (%s) stuck waiting %d, timeout=%ld\n", - current->comm, sp->id, sp->name, - thresh, timeout); - - host1x_debug_dump_syncpts(sp->host); - if (check_count == MAX_STUCK_CHECK_COUNT) - host1x_debug_dump(sp->host); - check_count++; - } - } - host1x_intr_put_ref(sp->host, sp->id, ref); + fence = host1x_fence_create(sp, thresh, false); + if (IS_ERR(fence)) + return PTR_ERR(fence); + + wait_err = dma_fence_wait_timeout(fence, true, timeout); + if (wait_err == 0) + host1x_fence_cancel(fence); + dma_fence_put(fence); + + if (value) + *value = host1x_syncpt_load(sp); -done: - return err; + /* + * Don't rely on dma_fence_wait_timeout return value, + * since it returns zero both on timeout and if the + * wait completed with 0 jiffies left. + */ + host1x_hw_syncpt_load(sp->host, sp); + if (wait_err == 0 && !host1x_syncpt_is_expired(sp, thresh)) + return -EAGAIN; + else if (wait_err < 0) + return wait_err; + else + return 0; } EXPORT_SYMBOL(host1x_syncpt_wait); @@ -242,136 +269,262 @@ EXPORT_SYMBOL(host1x_syncpt_wait); bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh) { u32 current_val; - u32 future_val; + smp_rmb(); + current_val = (u32)atomic_read(&sp->min_val); - future_val = (u32)atomic_read(&sp->max_val); - - /* Note the use of unsigned arithmetic here (mod 1<<32). - * - * c = current_val = min_val = the current value of the syncpoint. - * t = thresh = the value we are checking - * f = future_val = max_val = the value c will reach when all - * outstanding increments have completed. - * - * Note that c always chases f until it reaches f. - * - * Dtf = (f - t) - * Dtc = (c - t) - * - * Consider all cases: - * - * A) .....c..t..f..... Dtf < Dtc need to wait - * B) .....c.....f..t.. Dtf > Dtc expired - * C) ..t..c.....f..... Dtf > Dtc expired (Dct very large) - * - * Any case where f==c: always expired (for any t). Dtf == Dcf - * Any case where t==c: always expired (for any f). Dtf >= Dtc (because Dtc==0) - * Any case where t==f!=c: always wait. Dtf < Dtc (because Dtf==0, - * Dtc!=0) - * - * Other cases: - * - * A) .....t..f..c..... Dtf < Dtc need to wait - * A) .....f..c..t..... Dtf < Dtc need to wait - * A) .....f..t..c..... Dtf > Dtc expired - * - * So: - * Dtf >= Dtc implies EXPIRED (return true) - * Dtf < Dtc implies WAIT (return false) - * - * Note: If t is expired then we *cannot* wait on it. We would wait - * forever (hang the system). - * - * Note: do NOT get clever and remove the -thresh from both sides. It - * is NOT the same. - * - * If future valueis zero, we have a client managed sync point. In that - * case we do a direct comparison. - */ - if (!host1x_syncpt_client_managed(sp)) - return future_val - thresh >= current_val - thresh; - else - return (s32)(current_val - thresh) >= 0; -} -/* remove a wait pointed to by patch_addr */ -int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr) -{ - return host1x_hw_syncpt_patch_wait(sp->host, sp, patch_addr); + return ((current_val - thresh) & 0x80000000U) == 0U; } int host1x_syncpt_init(struct host1x *host) { + struct host1x_syncpt_base *bases; struct host1x_syncpt *syncpt; - int i; + unsigned int i; - syncpt = devm_kzalloc(host->dev, sizeof(*syncpt) * host->info->nb_pts, - GFP_KERNEL); + syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt), + GFP_KERNEL); if (!syncpt) return -ENOMEM; - for (i = 0; i < host->info->nb_pts; ++i) { + bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases), + GFP_KERNEL); + if (!bases) + return -ENOMEM; + + for (i = 0; i < host->info->nb_pts; i++) { syncpt[i].id = i; syncpt[i].host = host; } - host->syncpt = syncpt; + for (i = 0; i < host->info->nb_bases; i++) + bases[i].id = i; - host1x_syncpt_restore(host); + mutex_init(&host->syncpt_mutex); + host->syncpt = syncpt; + host->bases = bases; /* Allocate sync point to use for clearing waits for expired fences */ - host->nop_sp = _host1x_syncpt_alloc(host, NULL, false); + host->nop_sp = host1x_syncpt_alloc(host, 0, "reserved-nop"); if (!host->nop_sp) return -ENOMEM; + if (host->info->reserve_vblank_syncpts) { + kref_init(&host->syncpt[26].ref); + kref_init(&host->syncpt[27].ref); + } + return 0; } -struct host1x_syncpt *host1x_syncpt_request(struct device *dev, - bool client_managed) +/** + * host1x_syncpt_request() - request a syncpoint + * @client: client requesting the syncpoint + * @flags: flags + * + * host1x client drivers can use this function to allocate a syncpoint for + * subsequent use. A syncpoint returned by this function will be reserved for + * use by the client exclusively. When no longer using a syncpoint, a host1x + * client driver needs to release it using host1x_syncpt_put(). + */ +struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client, + unsigned long flags) { - struct host1x *host = dev_get_drvdata(dev->parent); - return _host1x_syncpt_alloc(host, dev, client_managed); + struct host1x *host = dev_get_drvdata(client->host->parent); + + return host1x_syncpt_alloc(host, flags, dev_name(client->dev)); } +EXPORT_SYMBOL(host1x_syncpt_request); -void host1x_syncpt_free(struct host1x_syncpt *sp) +static void syncpt_release(struct kref *ref) { - if (!sp) - return; + struct host1x_syncpt *sp = container_of(ref, struct host1x_syncpt, ref); + + atomic_set(&sp->max_val, host1x_syncpt_read(sp)); + sp->locked = false; + + host1x_syncpt_base_free(sp->base); kfree(sp->name); - sp->dev = NULL; + sp->base = NULL; sp->name = NULL; sp->client_managed = false; + + mutex_unlock(&sp->host->syncpt_mutex); } +/** + * host1x_syncpt_put() - free a requested syncpoint + * @sp: host1x syncpoint + * + * Release a syncpoint previously allocated using host1x_syncpt_request(). A + * host1x client driver should call this when the syncpoint is no longer in + * use. + */ +void host1x_syncpt_put(struct host1x_syncpt *sp) +{ + if (!sp) + return; + + kref_put_mutex(&sp->ref, syncpt_release, &sp->host->syncpt_mutex); +} +EXPORT_SYMBOL(host1x_syncpt_put); + void host1x_syncpt_deinit(struct host1x *host) { - int i; struct host1x_syncpt *sp = host->syncpt; + unsigned int i; + for (i = 0; i < host->info->nb_pts; i++, sp++) kfree(sp->name); } -int host1x_syncpt_nb_pts(struct host1x *host) +/** + * host1x_syncpt_read_max() - read maximum syncpoint value + * @sp: host1x syncpoint + * + * The maximum syncpoint value indicates how many operations there are in + * queue, either in channel or in a software thread. + */ +u32 host1x_syncpt_read_max(struct host1x_syncpt *sp) +{ + smp_rmb(); + + return (u32)atomic_read(&sp->max_val); +} +EXPORT_SYMBOL(host1x_syncpt_read_max); + +/** + * host1x_syncpt_read_min() - read minimum syncpoint value + * @sp: host1x syncpoint + * + * The minimum syncpoint value is a shadow of the current sync point value in + * hardware. + */ +u32 host1x_syncpt_read_min(struct host1x_syncpt *sp) +{ + smp_rmb(); + + return (u32)atomic_read(&sp->min_val); +} +EXPORT_SYMBOL(host1x_syncpt_read_min); + +/** + * host1x_syncpt_read() - read the current syncpoint value + * @sp: host1x syncpoint + */ +u32 host1x_syncpt_read(struct host1x_syncpt *sp) +{ + return host1x_syncpt_load(sp); +} +EXPORT_SYMBOL(host1x_syncpt_read); + +unsigned int host1x_syncpt_nb_pts(struct host1x *host) { return host->info->nb_pts; } -int host1x_syncpt_nb_bases(struct host1x *host) +unsigned int host1x_syncpt_nb_bases(struct host1x *host) { return host->info->nb_bases; } -int host1x_syncpt_nb_mlocks(struct host1x *host) +unsigned int host1x_syncpt_nb_mlocks(struct host1x *host) { return host->info->nb_mlocks; } -struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, u32 id) +/** + * host1x_syncpt_get_by_id() - obtain a syncpoint by ID + * @host: host1x controller + * @id: syncpoint ID + */ +struct host1x_syncpt *host1x_syncpt_get_by_id(struct host1x *host, + unsigned int id) +{ + if (id >= host->info->nb_pts) + return NULL; + + if (kref_get_unless_zero(&host->syncpt[id].ref)) + return &host->syncpt[id]; + else + return NULL; +} +EXPORT_SYMBOL(host1x_syncpt_get_by_id); + +/** + * host1x_syncpt_get_by_id_noref() - obtain a syncpoint by ID but don't + * increase the refcount. + * @host: host1x controller + * @id: syncpoint ID + */ +struct host1x_syncpt *host1x_syncpt_get_by_id_noref(struct host1x *host, + unsigned int id) { - if (host->info->nb_pts < id) + if (id >= host->info->nb_pts) return NULL; - return host->syncpt + id; + + return &host->syncpt[id]; +} +EXPORT_SYMBOL(host1x_syncpt_get_by_id_noref); + +/** + * host1x_syncpt_get() - increment syncpoint refcount + * @sp: syncpoint + */ +struct host1x_syncpt *host1x_syncpt_get(struct host1x_syncpt *sp) +{ + kref_get(&sp->ref); + + return sp; +} +EXPORT_SYMBOL(host1x_syncpt_get); + +/** + * host1x_syncpt_get_base() - obtain the wait base associated with a syncpoint + * @sp: host1x syncpoint + */ +struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp) +{ + return sp ? sp->base : NULL; +} +EXPORT_SYMBOL(host1x_syncpt_get_base); + +/** + * host1x_syncpt_base_id() - retrieve the ID of a syncpoint wait base + * @base: host1x syncpoint wait base + */ +u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base) +{ + return base->id; +} +EXPORT_SYMBOL(host1x_syncpt_base_id); + +static void do_nothing(struct kref *ref) +{ +} + +/** + * host1x_syncpt_release_vblank_reservation() - Make VBLANK syncpoint + * available for allocation + * + * @client: host1x bus client + * @syncpt_id: syncpoint ID to make available + * + * Makes VBLANK<i> syncpoint available for allocatation if it was + * reserved at initialization time. This should be called by the display + * driver after it has ensured that any VBLANK increment programming configured + * by the boot chain has been disabled. + */ +void host1x_syncpt_release_vblank_reservation(struct host1x_client *client, + u32 syncpt_id) +{ + struct host1x *host = dev_get_drvdata(client->host->parent); + + if (!host->info->reserve_vblank_syncpts) + return; + + kref_put(&host->syncpt[syncpt_id].ref, do_nothing); } +EXPORT_SYMBOL(host1x_syncpt_release_vblank_reservation); |