Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / gpu / drm / nouveau / nouveau_fence.c
blob503fa94dc06dbdb2b5fe5f1b098aace4f4777f1a
1 /*
2 * Copyright (C) 2007 Ben Skeggs.
3 * All Rights Reserved.
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial
15 * portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 #include <drm/drmP.h>
29 #include <linux/ktime.h>
30 #include <linux/hrtimer.h>
31 #include <trace/events/dma_fence.h>
33 #include <nvif/cl826e.h>
34 #include <nvif/notify.h>
35 #include <nvif/event.h>
37 #include "nouveau_drv.h"
38 #include "nouveau_dma.h"
39 #include "nouveau_fence.h"
41 static const struct dma_fence_ops nouveau_fence_ops_uevent;
42 static const struct dma_fence_ops nouveau_fence_ops_legacy;
44 static inline struct nouveau_fence *
45 from_fence(struct dma_fence *fence)
47 return container_of(fence, struct nouveau_fence, base);
50 static inline struct nouveau_fence_chan *
51 nouveau_fctx(struct nouveau_fence *fence)
53 return container_of(fence->base.lock, struct nouveau_fence_chan, lock);
56 static int
57 nouveau_fence_signal(struct nouveau_fence *fence)
59 int drop = 0;
61 dma_fence_signal_locked(&fence->base);
62 list_del(&fence->head);
63 rcu_assign_pointer(fence->channel, NULL);
65 if (test_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags)) {
66 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
68 if (!--fctx->notify_ref)
69 drop = 1;
72 dma_fence_put(&fence->base);
73 return drop;
76 static struct nouveau_fence *
77 nouveau_local_fence(struct dma_fence *fence, struct nouveau_drm *drm) {
78 struct nouveau_fence_priv *priv = (void*)drm->fence;
80 if (fence->ops != &nouveau_fence_ops_legacy &&
81 fence->ops != &nouveau_fence_ops_uevent)
82 return NULL;
84 if (fence->context < priv->context_base ||
85 fence->context >= priv->context_base + priv->contexts)
86 return NULL;
88 return from_fence(fence);
91 void
92 nouveau_fence_context_del(struct nouveau_fence_chan *fctx)
94 struct nouveau_fence *fence;
96 spin_lock_irq(&fctx->lock);
97 while (!list_empty(&fctx->pending)) {
98 fence = list_entry(fctx->pending.next, typeof(*fence), head);
100 if (nouveau_fence_signal(fence))
101 nvif_notify_put(&fctx->notify);
103 spin_unlock_irq(&fctx->lock);
105 nvif_notify_fini(&fctx->notify);
106 fctx->dead = 1;
109 * Ensure that all accesses to fence->channel complete before freeing
110 * the channel.
112 synchronize_rcu();
115 static void
116 nouveau_fence_context_put(struct kref *fence_ref)
118 kfree(container_of(fence_ref, struct nouveau_fence_chan, fence_ref));
121 void
122 nouveau_fence_context_free(struct nouveau_fence_chan *fctx)
124 kref_put(&fctx->fence_ref, nouveau_fence_context_put);
127 static int
128 nouveau_fence_update(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)
130 struct nouveau_fence *fence;
131 int drop = 0;
132 u32 seq = fctx->read(chan);
134 while (!list_empty(&fctx->pending)) {
135 fence = list_entry(fctx->pending.next, typeof(*fence), head);
137 if ((int)(seq - fence->base.seqno) < 0)
138 break;
140 drop |= nouveau_fence_signal(fence);
143 return drop;
146 static int
147 nouveau_fence_wait_uevent_handler(struct nvif_notify *notify)
149 struct nouveau_fence_chan *fctx =
150 container_of(notify, typeof(*fctx), notify);
151 unsigned long flags;
152 int ret = NVIF_NOTIFY_KEEP;
154 spin_lock_irqsave(&fctx->lock, flags);
155 if (!list_empty(&fctx->pending)) {
156 struct nouveau_fence *fence;
157 struct nouveau_channel *chan;
159 fence = list_entry(fctx->pending.next, typeof(*fence), head);
160 chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
161 if (nouveau_fence_update(fence->channel, fctx))
162 ret = NVIF_NOTIFY_DROP;
164 spin_unlock_irqrestore(&fctx->lock, flags);
166 return ret;
169 void
170 nouveau_fence_context_new(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)
172 struct nouveau_fence_priv *priv = (void*)chan->drm->fence;
173 struct nouveau_cli *cli = (void *)chan->user.client;
174 int ret;
176 INIT_LIST_HEAD(&fctx->flip);
177 INIT_LIST_HEAD(&fctx->pending);
178 spin_lock_init(&fctx->lock);
179 fctx->context = priv->context_base + chan->chid;
181 if (chan == chan->drm->cechan)
182 strcpy(fctx->name, "copy engine channel");
183 else if (chan == chan->drm->channel)
184 strcpy(fctx->name, "generic kernel channel");
185 else
186 strcpy(fctx->name, nvxx_client(&cli->base)->name);
188 kref_init(&fctx->fence_ref);
189 if (!priv->uevent)
190 return;
192 ret = nvif_notify_init(&chan->user, nouveau_fence_wait_uevent_handler,
193 false, NV826E_V0_NTFY_NON_STALL_INTERRUPT,
194 &(struct nvif_notify_uevent_req) { },
195 sizeof(struct nvif_notify_uevent_req),
196 sizeof(struct nvif_notify_uevent_rep),
197 &fctx->notify);
199 WARN_ON(ret);
203 nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan)
205 struct nouveau_fence_chan *fctx = chan->fence;
206 struct nouveau_fence_priv *priv = (void*)chan->drm->fence;
207 int ret;
209 fence->channel = chan;
210 fence->timeout = jiffies + (15 * HZ);
212 if (priv->uevent)
213 dma_fence_init(&fence->base, &nouveau_fence_ops_uevent,
214 &fctx->lock, fctx->context, ++fctx->sequence);
215 else
216 dma_fence_init(&fence->base, &nouveau_fence_ops_legacy,
217 &fctx->lock, fctx->context, ++fctx->sequence);
218 kref_get(&fctx->fence_ref);
220 trace_dma_fence_emit(&fence->base);
221 ret = fctx->emit(fence);
222 if (!ret) {
223 dma_fence_get(&fence->base);
224 spin_lock_irq(&fctx->lock);
226 if (nouveau_fence_update(chan, fctx))
227 nvif_notify_put(&fctx->notify);
229 list_add_tail(&fence->head, &fctx->pending);
230 spin_unlock_irq(&fctx->lock);
233 return ret;
236 bool
237 nouveau_fence_done(struct nouveau_fence *fence)
239 if (fence->base.ops == &nouveau_fence_ops_legacy ||
240 fence->base.ops == &nouveau_fence_ops_uevent) {
241 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
242 struct nouveau_channel *chan;
243 unsigned long flags;
245 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
246 return true;
248 spin_lock_irqsave(&fctx->lock, flags);
249 chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
250 if (chan && nouveau_fence_update(chan, fctx))
251 nvif_notify_put(&fctx->notify);
252 spin_unlock_irqrestore(&fctx->lock, flags);
254 return dma_fence_is_signaled(&fence->base);
257 static long
258 nouveau_fence_wait_legacy(struct dma_fence *f, bool intr, long wait)
260 struct nouveau_fence *fence = from_fence(f);
261 unsigned long sleep_time = NSEC_PER_MSEC / 1000;
262 unsigned long t = jiffies, timeout = t + wait;
264 while (!nouveau_fence_done(fence)) {
265 ktime_t kt;
267 t = jiffies;
269 if (wait != MAX_SCHEDULE_TIMEOUT && time_after_eq(t, timeout)) {
270 __set_current_state(TASK_RUNNING);
271 return 0;
274 __set_current_state(intr ? TASK_INTERRUPTIBLE :
275 TASK_UNINTERRUPTIBLE);
277 kt = sleep_time;
278 schedule_hrtimeout(&kt, HRTIMER_MODE_REL);
279 sleep_time *= 2;
280 if (sleep_time > NSEC_PER_MSEC)
281 sleep_time = NSEC_PER_MSEC;
283 if (intr && signal_pending(current))
284 return -ERESTARTSYS;
287 __set_current_state(TASK_RUNNING);
289 return timeout - t;
292 static int
293 nouveau_fence_wait_busy(struct nouveau_fence *fence, bool intr)
295 int ret = 0;
297 while (!nouveau_fence_done(fence)) {
298 if (time_after_eq(jiffies, fence->timeout)) {
299 ret = -EBUSY;
300 break;
303 __set_current_state(intr ?
304 TASK_INTERRUPTIBLE :
305 TASK_UNINTERRUPTIBLE);
307 if (intr && signal_pending(current)) {
308 ret = -ERESTARTSYS;
309 break;
313 __set_current_state(TASK_RUNNING);
314 return ret;
318 nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
320 long ret;
322 if (!lazy)
323 return nouveau_fence_wait_busy(fence, intr);
325 ret = dma_fence_wait_timeout(&fence->base, intr, 15 * HZ);
326 if (ret < 0)
327 return ret;
328 else if (!ret)
329 return -EBUSY;
330 else
331 return 0;
335 nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan, bool exclusive, bool intr)
337 struct nouveau_fence_chan *fctx = chan->fence;
338 struct dma_fence *fence;
339 struct reservation_object *resv = nvbo->bo.resv;
340 struct reservation_object_list *fobj;
341 struct nouveau_fence *f;
342 int ret = 0, i;
344 if (!exclusive) {
345 ret = reservation_object_reserve_shared(resv);
347 if (ret)
348 return ret;
351 fobj = reservation_object_get_list(resv);
352 fence = reservation_object_get_excl(resv);
354 if (fence && (!exclusive || !fobj || !fobj->shared_count)) {
355 struct nouveau_channel *prev = NULL;
356 bool must_wait = true;
358 f = nouveau_local_fence(fence, chan->drm);
359 if (f) {
360 rcu_read_lock();
361 prev = rcu_dereference(f->channel);
362 if (prev && (prev == chan || fctx->sync(f, prev, chan) == 0))
363 must_wait = false;
364 rcu_read_unlock();
367 if (must_wait)
368 ret = dma_fence_wait(fence, intr);
370 return ret;
373 if (!exclusive || !fobj)
374 return ret;
376 for (i = 0; i < fobj->shared_count && !ret; ++i) {
377 struct nouveau_channel *prev = NULL;
378 bool must_wait = true;
380 fence = rcu_dereference_protected(fobj->shared[i],
381 reservation_object_held(resv));
383 f = nouveau_local_fence(fence, chan->drm);
384 if (f) {
385 rcu_read_lock();
386 prev = rcu_dereference(f->channel);
387 if (prev && (prev == chan || fctx->sync(f, prev, chan) == 0))
388 must_wait = false;
389 rcu_read_unlock();
392 if (must_wait)
393 ret = dma_fence_wait(fence, intr);
396 return ret;
399 void
400 nouveau_fence_unref(struct nouveau_fence **pfence)
402 if (*pfence)
403 dma_fence_put(&(*pfence)->base);
404 *pfence = NULL;
408 nouveau_fence_new(struct nouveau_channel *chan, bool sysmem,
409 struct nouveau_fence **pfence)
411 struct nouveau_fence *fence;
412 int ret = 0;
414 if (unlikely(!chan->fence))
415 return -ENODEV;
417 fence = kzalloc(sizeof(*fence), GFP_KERNEL);
418 if (!fence)
419 return -ENOMEM;
421 ret = nouveau_fence_emit(fence, chan);
422 if (ret)
423 nouveau_fence_unref(&fence);
425 *pfence = fence;
426 return ret;
429 static const char *nouveau_fence_get_get_driver_name(struct dma_fence *fence)
431 return "nouveau";
434 static const char *nouveau_fence_get_timeline_name(struct dma_fence *f)
436 struct nouveau_fence *fence = from_fence(f);
437 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
439 return !fctx->dead ? fctx->name : "dead channel";
443 * In an ideal world, read would not assume the channel context is still alive.
444 * This function may be called from another device, running into free memory as a
445 * result. The drm node should still be there, so we can derive the index from
446 * the fence context.
448 static bool nouveau_fence_is_signaled(struct dma_fence *f)
450 struct nouveau_fence *fence = from_fence(f);
451 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
452 struct nouveau_channel *chan;
453 bool ret = false;
455 rcu_read_lock();
456 chan = rcu_dereference(fence->channel);
457 if (chan)
458 ret = (int)(fctx->read(chan) - fence->base.seqno) >= 0;
459 rcu_read_unlock();
461 return ret;
464 static bool nouveau_fence_no_signaling(struct dma_fence *f)
466 struct nouveau_fence *fence = from_fence(f);
469 * caller should have a reference on the fence,
470 * else fence could get freed here
472 WARN_ON(kref_read(&fence->base.refcount) <= 1);
475 * This needs uevents to work correctly, but dma_fence_add_callback relies on
476 * being able to enable signaling. It will still get signaled eventually,
477 * just not right away.
479 if (nouveau_fence_is_signaled(f)) {
480 list_del(&fence->head);
482 dma_fence_put(&fence->base);
483 return false;
486 return true;
489 static void nouveau_fence_release(struct dma_fence *f)
491 struct nouveau_fence *fence = from_fence(f);
492 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
494 kref_put(&fctx->fence_ref, nouveau_fence_context_put);
495 dma_fence_free(&fence->base);
498 static const struct dma_fence_ops nouveau_fence_ops_legacy = {
499 .get_driver_name = nouveau_fence_get_get_driver_name,
500 .get_timeline_name = nouveau_fence_get_timeline_name,
501 .enable_signaling = nouveau_fence_no_signaling,
502 .signaled = nouveau_fence_is_signaled,
503 .wait = nouveau_fence_wait_legacy,
504 .release = nouveau_fence_release
507 static bool nouveau_fence_enable_signaling(struct dma_fence *f)
509 struct nouveau_fence *fence = from_fence(f);
510 struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
511 bool ret;
513 if (!fctx->notify_ref++)
514 nvif_notify_get(&fctx->notify);
516 ret = nouveau_fence_no_signaling(f);
517 if (ret)
518 set_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags);
519 else if (!--fctx->notify_ref)
520 nvif_notify_put(&fctx->notify);
522 return ret;
525 static const struct dma_fence_ops nouveau_fence_ops_uevent = {
526 .get_driver_name = nouveau_fence_get_get_driver_name,
527 .get_timeline_name = nouveau_fence_get_timeline_name,
528 .enable_signaling = nouveau_fence_enable_signaling,
529 .signaled = nouveau_fence_is_signaled,
530 .wait = dma_fence_default_wait,
531 .release = nouveau_fence_release