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1/*2 * Copyright (C) 2007 Ben Skeggs.3 * All Rights Reserved.4 *5 * Permission is hereby granted, free of charge, to any person obtaining6 * a copy of this software and associated documentation files (the7 * "Software"), to deal in the Software without restriction, including8 * without limitation the rights to use, copy, modify, merge, publish,9 * distribute, sublicense, and/or sell copies of the Software, and to10 * permit persons to whom the Software is furnished to do so, subject to11 * the following conditions:12 *13 * The above copyright notice and this permission notice (including the14 * next paragraph) shall be included in all copies or substantial15 * portions of the Software.16 *17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.24 *25 */26 27#include <linux/ktime.h>28#include <linux/hrtimer.h>29#include <linux/sched/signal.h>30#include <trace/events/dma_fence.h>31 32#include <nvif/if0020.h>33 34#include "nouveau_drv.h"35#include "nouveau_dma.h"36#include "nouveau_fence.h"37 38static const struct dma_fence_ops nouveau_fence_ops_uevent;39static const struct dma_fence_ops nouveau_fence_ops_legacy;40 41static inline struct nouveau_fence *42from_fence(struct dma_fence *fence)43{44 return container_of(fence, struct nouveau_fence, base);45}46 47static inline struct nouveau_fence_chan *48nouveau_fctx(struct nouveau_fence *fence)49{50 return container_of(fence->base.lock, struct nouveau_fence_chan, lock);51}52 53static int54nouveau_fence_signal(struct nouveau_fence *fence)55{56 int drop = 0;57 58 dma_fence_signal_locked(&fence->base);59 list_del(&fence->head);60 rcu_assign_pointer(fence->channel, NULL);61 62 if (test_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags)) {63 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);64 65 if (!--fctx->notify_ref)66 drop = 1;67 }68 69 dma_fence_put(&fence->base);70 return drop;71}72 73static struct nouveau_fence *74nouveau_local_fence(struct dma_fence *fence, struct nouveau_drm *drm)75{76 if (fence->ops != &nouveau_fence_ops_legacy &&77 fence->ops != &nouveau_fence_ops_uevent)78 return NULL;79 80 return from_fence(fence);81}82 83void84nouveau_fence_context_kill(struct nouveau_fence_chan *fctx, int error)85{86 struct nouveau_fence *fence;87 unsigned long flags;88 89 spin_lock_irqsave(&fctx->lock, flags);90 while (!list_empty(&fctx->pending)) {91 fence = list_entry(fctx->pending.next, typeof(*fence), head);92 93 if (error)94 dma_fence_set_error(&fence->base, error);95 96 if (nouveau_fence_signal(fence))97 nvif_event_block(&fctx->event);98 }99 fctx->killed = 1;100 spin_unlock_irqrestore(&fctx->lock, flags);101}102 103void104nouveau_fence_context_del(struct nouveau_fence_chan *fctx)105{106 cancel_work_sync(&fctx->uevent_work);107 nouveau_fence_context_kill(fctx, 0);108 nvif_event_dtor(&fctx->event);109 fctx->dead = 1;110 111 /*112 * Ensure that all accesses to fence->channel complete before freeing113 * the channel.114 */115 synchronize_rcu();116}117 118static void119nouveau_fence_context_put(struct kref *fence_ref)120{121 kfree(container_of(fence_ref, struct nouveau_fence_chan, fence_ref));122}123 124void125nouveau_fence_context_free(struct nouveau_fence_chan *fctx)126{127 kref_put(&fctx->fence_ref, nouveau_fence_context_put);128}129 130static int131nouveau_fence_update(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)132{133 struct nouveau_fence *fence;134 int drop = 0;135 u32 seq = fctx->read(chan);136 137 while (!list_empty(&fctx->pending)) {138 fence = list_entry(fctx->pending.next, typeof(*fence), head);139 140 if ((int)(seq - fence->base.seqno) < 0)141 break;142 143 drop |= nouveau_fence_signal(fence);144 }145 146 return drop;147}148 149static void150nouveau_fence_uevent_work(struct work_struct *work)151{152 struct nouveau_fence_chan *fctx = container_of(work, struct nouveau_fence_chan,153 uevent_work);154 unsigned long flags;155 int drop = 0;156 157 spin_lock_irqsave(&fctx->lock, flags);158 if (!list_empty(&fctx->pending)) {159 struct nouveau_fence *fence;160 struct nouveau_channel *chan;161 162 fence = list_entry(fctx->pending.next, typeof(*fence), head);163 chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));164 if (nouveau_fence_update(chan, fctx))165 drop = 1;166 }167 if (drop)168 nvif_event_block(&fctx->event);169 170 spin_unlock_irqrestore(&fctx->lock, flags);171}172 173static int174nouveau_fence_wait_uevent_handler(struct nvif_event *event, void *repv, u32 repc)175{176 struct nouveau_fence_chan *fctx = container_of(event, typeof(*fctx), event);177 schedule_work(&fctx->uevent_work);178 return NVIF_EVENT_KEEP;179}180 181void182nouveau_fence_context_new(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)183{184 struct nouveau_cli *cli = chan->cli;185 struct nouveau_drm *drm = cli->drm;186 struct nouveau_fence_priv *priv = (void*)drm->fence;187 struct {188 struct nvif_event_v0 base;189 struct nvif_chan_event_v0 host;190 } args;191 int ret;192 193 INIT_WORK(&fctx->uevent_work, nouveau_fence_uevent_work);194 INIT_LIST_HEAD(&fctx->flip);195 INIT_LIST_HEAD(&fctx->pending);196 spin_lock_init(&fctx->lock);197 fctx->context = drm->runl[chan->runlist].context_base + chan->chid;198 199 if (chan == drm->cechan)200 strcpy(fctx->name, "copy engine channel");201 else if (chan == drm->channel)202 strcpy(fctx->name, "generic kernel channel");203 else204 strcpy(fctx->name, cli->name);205 206 kref_init(&fctx->fence_ref);207 if (!priv->uevent)208 return;209 210 args.host.version = 0;211 args.host.type = NVIF_CHAN_EVENT_V0_NON_STALL_INTR;212 213 ret = nvif_event_ctor(&chan->user, "fenceNonStallIntr", (chan->runlist << 16) | chan->chid,214 nouveau_fence_wait_uevent_handler, false,215 &args.base, sizeof(args), &fctx->event);216 217 WARN_ON(ret);218}219 220int221nouveau_fence_emit(struct nouveau_fence *fence)222{223 struct nouveau_channel *chan = unrcu_pointer(fence->channel);224 struct nouveau_fence_chan *fctx = chan->fence;225 struct nouveau_fence_priv *priv = (void*)chan->cli->drm->fence;226 int ret;227 228 fence->timeout = jiffies + (15 * HZ);229 230 if (priv->uevent)231 dma_fence_init(&fence->base, &nouveau_fence_ops_uevent,232 &fctx->lock, fctx->context, ++fctx->sequence);233 else234 dma_fence_init(&fence->base, &nouveau_fence_ops_legacy,235 &fctx->lock, fctx->context, ++fctx->sequence);236 kref_get(&fctx->fence_ref);237 238 ret = fctx->emit(fence);239 if (!ret) {240 dma_fence_get(&fence->base);241 spin_lock_irq(&fctx->lock);242 243 if (unlikely(fctx->killed)) {244 spin_unlock_irq(&fctx->lock);245 dma_fence_put(&fence->base);246 return -ENODEV;247 }248 249 if (nouveau_fence_update(chan, fctx))250 nvif_event_block(&fctx->event);251 252 list_add_tail(&fence->head, &fctx->pending);253 spin_unlock_irq(&fctx->lock);254 }255 256 return ret;257}258 259bool260nouveau_fence_done(struct nouveau_fence *fence)261{262 if (fence->base.ops == &nouveau_fence_ops_legacy ||263 fence->base.ops == &nouveau_fence_ops_uevent) {264 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);265 struct nouveau_channel *chan;266 unsigned long flags;267 268 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))269 return true;270 271 spin_lock_irqsave(&fctx->lock, flags);272 chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));273 if (chan && nouveau_fence_update(chan, fctx))274 nvif_event_block(&fctx->event);275 spin_unlock_irqrestore(&fctx->lock, flags);276 }277 return dma_fence_is_signaled(&fence->base);278}279 280static long281nouveau_fence_wait_legacy(struct dma_fence *f, bool intr, long wait)282{283 struct nouveau_fence *fence = from_fence(f);284 unsigned long sleep_time = NSEC_PER_MSEC / 1000;285 unsigned long t = jiffies, timeout = t + wait;286 287 while (!nouveau_fence_done(fence)) {288 ktime_t kt;289 290 t = jiffies;291 292 if (wait != MAX_SCHEDULE_TIMEOUT && time_after_eq(t, timeout)) {293 __set_current_state(TASK_RUNNING);294 return 0;295 }296 297 __set_current_state(intr ? TASK_INTERRUPTIBLE :298 TASK_UNINTERRUPTIBLE);299 300 kt = sleep_time;301 schedule_hrtimeout(&kt, HRTIMER_MODE_REL);302 sleep_time *= 2;303 if (sleep_time > NSEC_PER_MSEC)304 sleep_time = NSEC_PER_MSEC;305 306 if (intr && signal_pending(current))307 return -ERESTARTSYS;308 }309 310 __set_current_state(TASK_RUNNING);311 312 return timeout - t;313}314 315static int316nouveau_fence_wait_busy(struct nouveau_fence *fence, bool intr)317{318 int ret = 0;319 320 while (!nouveau_fence_done(fence)) {321 if (time_after_eq(jiffies, fence->timeout)) {322 ret = -EBUSY;323 break;324 }325 326 __set_current_state(intr ?327 TASK_INTERRUPTIBLE :328 TASK_UNINTERRUPTIBLE);329 330 if (intr && signal_pending(current)) {331 ret = -ERESTARTSYS;332 break;333 }334 }335 336 __set_current_state(TASK_RUNNING);337 return ret;338}339 340int341nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)342{343 long ret;344 345 if (!lazy)346 return nouveau_fence_wait_busy(fence, intr);347 348 ret = dma_fence_wait_timeout(&fence->base, intr, 15 * HZ);349 if (ret < 0)350 return ret;351 else if (!ret)352 return -EBUSY;353 else354 return 0;355}356 357int358nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan,359 bool exclusive, bool intr)360{361 struct nouveau_fence_chan *fctx = chan->fence;362 struct dma_resv *resv = nvbo->bo.base.resv;363 int i, ret;364 365 ret = dma_resv_reserve_fences(resv, 1);366 if (ret)367 return ret;368 369 /* Waiting for the writes first causes performance regressions370 * under some circumstances. So manually wait for the reads first.371 */372 for (i = 0; i < 2; ++i) {373 struct dma_resv_iter cursor;374 struct dma_fence *fence;375 376 dma_resv_for_each_fence(&cursor, resv,377 dma_resv_usage_rw(exclusive),378 fence) {379 enum dma_resv_usage usage;380 struct nouveau_fence *f;381 382 usage = dma_resv_iter_usage(&cursor);383 if (i == 0 && usage == DMA_RESV_USAGE_WRITE)384 continue;385 386 f = nouveau_local_fence(fence, chan->cli->drm);387 if (f) {388 struct nouveau_channel *prev;389 bool must_wait = true;390 391 rcu_read_lock();392 prev = rcu_dereference(f->channel);393 if (prev && (prev == chan ||394 fctx->sync(f, prev, chan) == 0))395 must_wait = false;396 rcu_read_unlock();397 if (!must_wait)398 continue;399 }400 401 ret = dma_fence_wait(fence, intr);402 if (ret)403 return ret;404 }405 }406 407 return 0;408}409 410void411nouveau_fence_unref(struct nouveau_fence **pfence)412{413 if (*pfence)414 dma_fence_put(&(*pfence)->base);415 *pfence = NULL;416}417 418int419nouveau_fence_create(struct nouveau_fence **pfence,420 struct nouveau_channel *chan)421{422 struct nouveau_fence *fence;423 424 if (unlikely(!chan->fence))425 return -ENODEV;426 427 fence = kzalloc(sizeof(*fence), GFP_KERNEL);428 if (!fence)429 return -ENOMEM;430 431 fence->channel = chan;432 433 *pfence = fence;434 return 0;435}436 437int438nouveau_fence_new(struct nouveau_fence **pfence,439 struct nouveau_channel *chan)440{441 int ret = 0;442 443 ret = nouveau_fence_create(pfence, chan);444 if (ret)445 return ret;446 447 ret = nouveau_fence_emit(*pfence);448 if (ret)449 nouveau_fence_unref(pfence);450 451 return ret;452}453 454static const char *nouveau_fence_get_get_driver_name(struct dma_fence *fence)455{456 return "nouveau";457}458 459static const char *nouveau_fence_get_timeline_name(struct dma_fence *f)460{461 struct nouveau_fence *fence = from_fence(f);462 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);463 464 return !fctx->dead ? fctx->name : "dead channel";465}466 467/*468 * In an ideal world, read would not assume the channel context is still alive.469 * This function may be called from another device, running into free memory as a470 * result. The drm node should still be there, so we can derive the index from471 * the fence context.472 */473static bool nouveau_fence_is_signaled(struct dma_fence *f)474{475 struct nouveau_fence *fence = from_fence(f);476 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);477 struct nouveau_channel *chan;478 bool ret = false;479 480 rcu_read_lock();481 chan = rcu_dereference(fence->channel);482 if (chan)483 ret = (int)(fctx->read(chan) - fence->base.seqno) >= 0;484 rcu_read_unlock();485 486 return ret;487}488 489static bool nouveau_fence_no_signaling(struct dma_fence *f)490{491 struct nouveau_fence *fence = from_fence(f);492 493 /*494 * caller should have a reference on the fence,495 * else fence could get freed here496 */497 WARN_ON(kref_read(&fence->base.refcount) <= 1);498 499 /*500 * This needs uevents to work correctly, but dma_fence_add_callback relies on501 * being able to enable signaling. It will still get signaled eventually,502 * just not right away.503 */504 if (nouveau_fence_is_signaled(f)) {505 list_del(&fence->head);506 507 dma_fence_put(&fence->base);508 return false;509 }510 511 return true;512}513 514static void nouveau_fence_release(struct dma_fence *f)515{516 struct nouveau_fence *fence = from_fence(f);517 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);518 519 kref_put(&fctx->fence_ref, nouveau_fence_context_put);520 dma_fence_free(&fence->base);521}522 523static const struct dma_fence_ops nouveau_fence_ops_legacy = {524 .get_driver_name = nouveau_fence_get_get_driver_name,525 .get_timeline_name = nouveau_fence_get_timeline_name,526 .enable_signaling = nouveau_fence_no_signaling,527 .signaled = nouveau_fence_is_signaled,528 .wait = nouveau_fence_wait_legacy,529 .release = nouveau_fence_release530};531 532static bool nouveau_fence_enable_signaling(struct dma_fence *f)533{534 struct nouveau_fence *fence = from_fence(f);535 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);536 bool ret;537 538 if (!fctx->notify_ref++)539 nvif_event_allow(&fctx->event);540 541 ret = nouveau_fence_no_signaling(f);542 if (ret)543 set_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags);544 else if (!--fctx->notify_ref)545 nvif_event_block(&fctx->event);546 547 return ret;548}549 550static const struct dma_fence_ops nouveau_fence_ops_uevent = {551 .get_driver_name = nouveau_fence_get_get_driver_name,552 .get_timeline_name = nouveau_fence_get_timeline_name,553 .enable_signaling = nouveau_fence_enable_signaling,554 .signaled = nouveau_fence_is_signaled,555 .release = nouveau_fence_release556};557