summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/nouveau/nouveau_fence.c
blob: 61d9e70da9fd536252b7643a42385717c1027957 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
/*
 * Copyright (C) 2007 Ben Skeggs.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include <linux/ktime.h>
#include <linux/hrtimer.h>
#include <linux/sched/signal.h>
#include <trace/events/dma_fence.h>

#include <nvif/if0020.h>

#include "nouveau_drv.h"
#include "nouveau_dma.h"
#include "nouveau_fence.h"

static const struct dma_fence_ops nouveau_fence_ops_uevent;
static const struct dma_fence_ops nouveau_fence_ops_legacy;

static inline struct nouveau_fence *
from_fence(struct dma_fence *fence)
{
	return container_of(fence, struct nouveau_fence, base);
}

static inline struct nouveau_fence_chan *
nouveau_fctx(struct nouveau_fence *fence)
{
	return container_of(fence->base.lock, struct nouveau_fence_chan, lock);
}

static int
nouveau_fence_signal(struct nouveau_fence *fence)
{
	int drop = 0;

	dma_fence_signal_locked(&fence->base);
	list_del(&fence->head);
	rcu_assign_pointer(fence->channel, NULL);

	if (test_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags)) {
		struct nouveau_fence_chan *fctx = nouveau_fctx(fence);

		if (!--fctx->notify_ref)
			drop = 1;
	}

	dma_fence_put(&fence->base);
	return drop;
}

static struct nouveau_fence *
nouveau_local_fence(struct dma_fence *fence, struct nouveau_drm *drm)
{
	if (fence->ops != &nouveau_fence_ops_legacy &&
	    fence->ops != &nouveau_fence_ops_uevent)
		return NULL;

	return from_fence(fence);
}

void
nouveau_fence_context_kill(struct nouveau_fence_chan *fctx, int error)
{
	struct nouveau_fence *fence;
	unsigned long flags;

	spin_lock_irqsave(&fctx->lock, flags);
	while (!list_empty(&fctx->pending)) {
		fence = list_entry(fctx->pending.next, typeof(*fence), head);

		if (error)
			dma_fence_set_error(&fence->base, error);

		if (nouveau_fence_signal(fence))
			nvif_event_block(&fctx->event);
	}
	fctx->killed = 1;
	spin_unlock_irqrestore(&fctx->lock, flags);
}

void
nouveau_fence_context_del(struct nouveau_fence_chan *fctx)
{
	nouveau_fence_context_kill(fctx, 0);
	nvif_event_dtor(&fctx->event);
	fctx->dead = 1;

	/*
	 * Ensure that all accesses to fence->channel complete before freeing
	 * the channel.
	 */
	synchronize_rcu();
}

static void
nouveau_fence_context_put(struct kref *fence_ref)
{
	kfree(container_of(fence_ref, struct nouveau_fence_chan, fence_ref));
}

void
nouveau_fence_context_free(struct nouveau_fence_chan *fctx)
{
	kref_put(&fctx->fence_ref, nouveau_fence_context_put);
}

static int
nouveau_fence_update(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)
{
	struct nouveau_fence *fence;
	int drop = 0;
	u32 seq = fctx->read(chan);

	while (!list_empty(&fctx->pending)) {
		fence = list_entry(fctx->pending.next, typeof(*fence), head);

		if ((int)(seq - fence->base.seqno) < 0)
			break;

		drop |= nouveau_fence_signal(fence);
	}

	return drop;
}

static int
nouveau_fence_wait_uevent_handler(struct nvif_event *event, void *repv, u32 repc)
{
	struct nouveau_fence_chan *fctx = container_of(event, typeof(*fctx), event);
	unsigned long flags;
	int ret = NVIF_EVENT_KEEP;

	spin_lock_irqsave(&fctx->lock, flags);
	if (!list_empty(&fctx->pending)) {
		struct nouveau_fence *fence;
		struct nouveau_channel *chan;

		fence = list_entry(fctx->pending.next, typeof(*fence), head);
		chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
		if (nouveau_fence_update(chan, fctx))
			ret = NVIF_EVENT_DROP;
	}
	spin_unlock_irqrestore(&fctx->lock, flags);

	return ret;
}

void
nouveau_fence_context_new(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)
{
	struct nouveau_fence_priv *priv = (void*)chan->drm->fence;
	struct nouveau_cli *cli = (void *)chan->user.client;
	struct {
		struct nvif_event_v0 base;
		struct nvif_chan_event_v0 host;
	} args;
	int ret;

	INIT_LIST_HEAD(&fctx->flip);
	INIT_LIST_HEAD(&fctx->pending);
	spin_lock_init(&fctx->lock);
	fctx->context = chan->drm->runl[chan->runlist].context_base + chan->chid;

	if (chan == chan->drm->cechan)
		strcpy(fctx->name, "copy engine channel");
	else if (chan == chan->drm->channel)
		strcpy(fctx->name, "generic kernel channel");
	else
		strcpy(fctx->name, nvxx_client(&cli->base)->name);

	kref_init(&fctx->fence_ref);
	if (!priv->uevent)
		return;

	args.host.version = 0;
	args.host.type = NVIF_CHAN_EVENT_V0_NON_STALL_INTR;

	ret = nvif_event_ctor(&chan->user, "fenceNonStallIntr", (chan->runlist << 16) | chan->chid,
			      nouveau_fence_wait_uevent_handler, false,
			      &args.base, sizeof(args), &fctx->event);

	WARN_ON(ret);
}

int
nouveau_fence_emit(struct nouveau_fence *fence)
{
	struct nouveau_channel *chan = fence->channel;
	struct nouveau_fence_chan *fctx = chan->fence;
	struct nouveau_fence_priv *priv = (void*)chan->drm->fence;
	int ret;

	fence->timeout  = jiffies + (15 * HZ);

	if (priv->uevent)
		dma_fence_init(&fence->base, &nouveau_fence_ops_uevent,
			       &fctx->lock, fctx->context, ++fctx->sequence);
	else
		dma_fence_init(&fence->base, &nouveau_fence_ops_legacy,
			       &fctx->lock, fctx->context, ++fctx->sequence);
	kref_get(&fctx->fence_ref);

	ret = fctx->emit(fence);
	if (!ret) {
		dma_fence_get(&fence->base);
		spin_lock_irq(&fctx->lock);

		if (unlikely(fctx->killed)) {
			spin_unlock_irq(&fctx->lock);
			dma_fence_put(&fence->base);
			return -ENODEV;
		}

		if (nouveau_fence_update(chan, fctx))
			nvif_event_block(&fctx->event);

		list_add_tail(&fence->head, &fctx->pending);
		spin_unlock_irq(&fctx->lock);
	}

	return ret;
}

bool
nouveau_fence_done(struct nouveau_fence *fence)
{
	if (fence->base.ops == &nouveau_fence_ops_legacy ||
	    fence->base.ops == &nouveau_fence_ops_uevent) {
		struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
		struct nouveau_channel *chan;
		unsigned long flags;

		if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
			return true;

		spin_lock_irqsave(&fctx->lock, flags);
		chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
		if (chan && nouveau_fence_update(chan, fctx))
			nvif_event_block(&fctx->event);
		spin_unlock_irqrestore(&fctx->lock, flags);
	}
	return dma_fence_is_signaled(&fence->base);
}

static long
nouveau_fence_wait_legacy(struct dma_fence *f, bool intr, long wait)
{
	struct nouveau_fence *fence = from_fence(f);
	unsigned long sleep_time = NSEC_PER_MSEC / 1000;
	unsigned long t = jiffies, timeout = t + wait;

	while (!nouveau_fence_done(fence)) {
		ktime_t kt;

		t = jiffies;

		if (wait != MAX_SCHEDULE_TIMEOUT && time_after_eq(t, timeout)) {
			__set_current_state(TASK_RUNNING);
			return 0;
		}

		__set_current_state(intr ? TASK_INTERRUPTIBLE :
					   TASK_UNINTERRUPTIBLE);

		kt = sleep_time;
		schedule_hrtimeout(&kt, HRTIMER_MODE_REL);
		sleep_time *= 2;
		if (sleep_time > NSEC_PER_MSEC)
			sleep_time = NSEC_PER_MSEC;

		if (intr && signal_pending(current))
			return -ERESTARTSYS;
	}

	__set_current_state(TASK_RUNNING);

	return timeout - t;
}

static int
nouveau_fence_wait_busy(struct nouveau_fence *fence, bool intr)
{
	int ret = 0;

	while (!nouveau_fence_done(fence)) {
		if (time_after_eq(jiffies, fence->timeout)) {
			ret = -EBUSY;
			break;
		}

		__set_current_state(intr ?
				    TASK_INTERRUPTIBLE :
				    TASK_UNINTERRUPTIBLE);

		if (intr && signal_pending(current)) {
			ret = -ERESTARTSYS;
			break;
		}
	}

	__set_current_state(TASK_RUNNING);
	return ret;
}

int
nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
{
	long ret;

	if (!lazy)
		return nouveau_fence_wait_busy(fence, intr);

	ret = dma_fence_wait_timeout(&fence->base, intr, 15 * HZ);
	if (ret < 0)
		return ret;
	else if (!ret)
		return -EBUSY;
	else
		return 0;
}

int
nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan,
		   bool exclusive, bool intr)
{
	struct nouveau_fence_chan *fctx = chan->fence;
	struct dma_resv *resv = nvbo->bo.base.resv;
	int i, ret;

	ret = dma_resv_reserve_fences(resv, 1);
	if (ret)
		return ret;

	/* Waiting for the writes first causes performance regressions
	 * under some circumstances. So manually wait for the reads first.
	 */
	for (i = 0; i < 2; ++i) {
		struct dma_resv_iter cursor;
		struct dma_fence *fence;

		dma_resv_for_each_fence(&cursor, resv,
					dma_resv_usage_rw(exclusive),
					fence) {
			enum dma_resv_usage usage;
			struct nouveau_fence *f;

			usage = dma_resv_iter_usage(&cursor);
			if (i == 0 && usage == DMA_RESV_USAGE_WRITE)
				continue;

			f = nouveau_local_fence(fence, chan->drm);
			if (f) {
				struct nouveau_channel *prev;
				bool must_wait = true;

				rcu_read_lock();
				prev = rcu_dereference(f->channel);
				if (prev && (prev == chan ||
					     fctx->sync(f, prev, chan) == 0))
					must_wait = false;
				rcu_read_unlock();
				if (!must_wait)
					continue;
			}

			ret = dma_fence_wait(fence, intr);
			if (ret)
				return ret;
		}
	}

	return 0;
}

void
nouveau_fence_unref(struct nouveau_fence **pfence)
{
	if (*pfence)
		dma_fence_put(&(*pfence)->base);
	*pfence = NULL;
}

int
nouveau_fence_create(struct nouveau_fence **pfence,
		     struct nouveau_channel *chan)
{
	struct nouveau_fence *fence;

	if (unlikely(!chan->fence))
		return -ENODEV;

	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
	if (!fence)
		return -ENOMEM;

	fence->channel = chan;

	*pfence = fence;
	return 0;
}

int
nouveau_fence_new(struct nouveau_fence **pfence,
		  struct nouveau_channel *chan)
{
	int ret = 0;

	ret = nouveau_fence_create(pfence, chan);
	if (ret)
		return ret;

	ret = nouveau_fence_emit(*pfence);
	if (ret)
		nouveau_fence_unref(pfence);

	return ret;
}

static const char *nouveau_fence_get_get_driver_name(struct dma_fence *fence)
{
	return "nouveau";
}

static const char *nouveau_fence_get_timeline_name(struct dma_fence *f)
{
	struct nouveau_fence *fence = from_fence(f);
	struct nouveau_fence_chan *fctx = nouveau_fctx(fence);

	return !fctx->dead ? fctx->name : "dead channel";
}

/*
 * In an ideal world, read would not assume the channel context is still alive.
 * This function may be called from another device, running into free memory as a
 * result. The drm node should still be there, so we can derive the index from
 * the fence context.
 */
static bool nouveau_fence_is_signaled(struct dma_fence *f)
{
	struct nouveau_fence *fence = from_fence(f);
	struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
	struct nouveau_channel *chan;
	bool ret = false;

	rcu_read_lock();
	chan = rcu_dereference(fence->channel);
	if (chan)
		ret = (int)(fctx->read(chan) - fence->base.seqno) >= 0;
	rcu_read_unlock();

	return ret;
}

static bool nouveau_fence_no_signaling(struct dma_fence *f)
{
	struct nouveau_fence *fence = from_fence(f);

	/*
	 * caller should have a reference on the fence,
	 * else fence could get freed here
	 */
	WARN_ON(kref_read(&fence->base.refcount) <= 1);

	/*
	 * This needs uevents to work correctly, but dma_fence_add_callback relies on
	 * being able to enable signaling. It will still get signaled eventually,
	 * just not right away.
	 */
	if (nouveau_fence_is_signaled(f)) {
		list_del(&fence->head);

		dma_fence_put(&fence->base);
		return false;
	}

	return true;
}

static void nouveau_fence_release(struct dma_fence *f)
{
	struct nouveau_fence *fence = from_fence(f);
	struct nouveau_fence_chan *fctx = nouveau_fctx(fence);

	kref_put(&fctx->fence_ref, nouveau_fence_context_put);
	dma_fence_free(&fence->base);
}

static const struct dma_fence_ops nouveau_fence_ops_legacy = {
	.get_driver_name = nouveau_fence_get_get_driver_name,
	.get_timeline_name = nouveau_fence_get_timeline_name,
	.enable_signaling = nouveau_fence_no_signaling,
	.signaled = nouveau_fence_is_signaled,
	.wait = nouveau_fence_wait_legacy,
	.release = nouveau_fence_release
};

static bool nouveau_fence_enable_signaling(struct dma_fence *f)
{
	struct nouveau_fence *fence = from_fence(f);
	struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
	bool ret;

	if (!fctx->notify_ref++)
		nvif_event_allow(&fctx->event);

	ret = nouveau_fence_no_signaling(f);
	if (ret)
		set_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags);
	else if (!--fctx->notify_ref)
		nvif_event_block(&fctx->event);

	return ret;
}

static const struct dma_fence_ops nouveau_fence_ops_uevent = {
	.get_driver_name = nouveau_fence_get_get_driver_name,
	.get_timeline_name = nouveau_fence_get_timeline_name,
	.enable_signaling = nouveau_fence_enable_signaling,
	.signaled = nouveau_fence_is_signaled,
	.release = nouveau_fence_release
};