4b9f4493c9f9d3008d46b64597d7c27d51a21197
[linux-2.6.git] / drivers / gpu / drm / nouveau / nouveau_fence.c
1 /*
2  * Copyright (C) 2007 Ben Skeggs.
3  * All Rights Reserved.
4  *
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:
12  *
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.
16  *
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.
24  *
25  */
26
27 #include "drmP.h"
28 #include "drm.h"
29
30 #include <linux/ktime.h>
31 #include <linux/hrtimer.h>
32
33 #include "nouveau_drv.h"
34 #include "nouveau_ramht.h"
35 #include "nouveau_dma.h"
36
37 #define USE_REFCNT(dev) (nouveau_private(dev)->chipset >= 0x10)
38 #define USE_SEMA(dev) (nouveau_private(dev)->chipset >= 0x17)
39
40 struct nouveau_fence {
41         struct nouveau_channel *channel;
42         struct kref refcount;
43         struct list_head entry;
44
45         uint32_t sequence;
46         bool signalled;
47
48         void (*work)(void *priv, bool signalled);
49         void *priv;
50 };
51
52 struct nouveau_semaphore {
53         struct kref ref;
54         struct drm_device *dev;
55         struct drm_mm_node *mem;
56 };
57
58 static inline struct nouveau_fence *
59 nouveau_fence(void *sync_obj)
60 {
61         return (struct nouveau_fence *)sync_obj;
62 }
63
64 static void
65 nouveau_fence_del(struct kref *ref)
66 {
67         struct nouveau_fence *fence =
68                 container_of(ref, struct nouveau_fence, refcount);
69
70         nouveau_channel_ref(NULL, &fence->channel);
71         kfree(fence);
72 }
73
74 void
75 nouveau_fence_update(struct nouveau_channel *chan)
76 {
77         struct drm_device *dev = chan->dev;
78         struct nouveau_fence *tmp, *fence;
79         uint32_t sequence;
80
81         spin_lock(&chan->fence.lock);
82
83         /* Fetch the last sequence if the channel is still up and running */
84         if (likely(!list_empty(&chan->fence.pending))) {
85                 if (USE_REFCNT(dev))
86                         sequence = nvchan_rd32(chan, 0x48);
87                 else
88                         sequence = atomic_read(&chan->fence.last_sequence_irq);
89
90                 if (chan->fence.sequence_ack == sequence)
91                         goto out;
92                 chan->fence.sequence_ack = sequence;
93         }
94
95         list_for_each_entry_safe(fence, tmp, &chan->fence.pending, entry) {
96                 sequence = fence->sequence;
97                 fence->signalled = true;
98                 list_del(&fence->entry);
99
100                 if (unlikely(fence->work))
101                         fence->work(fence->priv, true);
102
103                 kref_put(&fence->refcount, nouveau_fence_del);
104
105                 if (sequence == chan->fence.sequence_ack)
106                         break;
107         }
108 out:
109         spin_unlock(&chan->fence.lock);
110 }
111
112 int
113 nouveau_fence_new(struct nouveau_channel *chan, struct nouveau_fence **pfence,
114                   bool emit)
115 {
116         struct nouveau_fence *fence;
117         int ret = 0;
118
119         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
120         if (!fence)
121                 return -ENOMEM;
122         kref_init(&fence->refcount);
123         nouveau_channel_ref(chan, &fence->channel);
124
125         if (emit)
126                 ret = nouveau_fence_emit(fence);
127
128         if (ret)
129                 nouveau_fence_unref(&fence);
130         *pfence = fence;
131         return ret;
132 }
133
134 struct nouveau_channel *
135 nouveau_fence_channel(struct nouveau_fence *fence)
136 {
137         return fence ? nouveau_channel_get_unlocked(fence->channel) : NULL;
138 }
139
140 int
141 nouveau_fence_emit(struct nouveau_fence *fence)
142 {
143         struct nouveau_channel *chan = fence->channel;
144         struct drm_device *dev = chan->dev;
145         struct drm_nouveau_private *dev_priv = dev->dev_private;
146         int ret;
147
148         ret = RING_SPACE(chan, 2);
149         if (ret)
150                 return ret;
151
152         if (unlikely(chan->fence.sequence == chan->fence.sequence_ack - 1)) {
153                 nouveau_fence_update(chan);
154
155                 BUG_ON(chan->fence.sequence ==
156                        chan->fence.sequence_ack - 1);
157         }
158
159         fence->sequence = ++chan->fence.sequence;
160
161         kref_get(&fence->refcount);
162         spin_lock(&chan->fence.lock);
163         list_add_tail(&fence->entry, &chan->fence.pending);
164         spin_unlock(&chan->fence.lock);
165
166         if (USE_REFCNT(dev)) {
167                 if (dev_priv->card_type < NV_C0)
168                         BEGIN_RING(chan, NvSubSw, 0x0050, 1);
169                 else
170                         BEGIN_NVC0(chan, 2, NvSubM2MF, 0x0050, 1);
171         } else {
172                 BEGIN_RING(chan, NvSubSw, 0x0150, 1);
173         }
174         OUT_RING (chan, fence->sequence);
175         FIRE_RING(chan);
176
177         return 0;
178 }
179
180 void
181 nouveau_fence_work(struct nouveau_fence *fence,
182                    void (*work)(void *priv, bool signalled),
183                    void *priv)
184 {
185         BUG_ON(fence->work);
186
187         spin_lock(&fence->channel->fence.lock);
188
189         if (fence->signalled) {
190                 work(priv, true);
191         } else {
192                 fence->work = work;
193                 fence->priv = priv;
194         }
195
196         spin_unlock(&fence->channel->fence.lock);
197 }
198
199 void
200 __nouveau_fence_unref(void **sync_obj)
201 {
202         struct nouveau_fence *fence = nouveau_fence(*sync_obj);
203
204         if (fence)
205                 kref_put(&fence->refcount, nouveau_fence_del);
206         *sync_obj = NULL;
207 }
208
209 void *
210 __nouveau_fence_ref(void *sync_obj)
211 {
212         struct nouveau_fence *fence = nouveau_fence(sync_obj);
213
214         kref_get(&fence->refcount);
215         return sync_obj;
216 }
217
218 bool
219 __nouveau_fence_signalled(void *sync_obj, void *sync_arg)
220 {
221         struct nouveau_fence *fence = nouveau_fence(sync_obj);
222         struct nouveau_channel *chan = fence->channel;
223
224         if (fence->signalled)
225                 return true;
226
227         nouveau_fence_update(chan);
228         return fence->signalled;
229 }
230
231 int
232 __nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr)
233 {
234         unsigned long timeout = jiffies + (3 * DRM_HZ);
235         unsigned long sleep_time = NSEC_PER_MSEC / 1000;
236         ktime_t t;
237         int ret = 0;
238
239         while (1) {
240                 if (__nouveau_fence_signalled(sync_obj, sync_arg))
241                         break;
242
243                 if (time_after_eq(jiffies, timeout)) {
244                         ret = -EBUSY;
245                         break;
246                 }
247
248                 __set_current_state(intr ? TASK_INTERRUPTIBLE
249                         : TASK_UNINTERRUPTIBLE);
250                 if (lazy) {
251                         t = ktime_set(0, sleep_time);
252                         schedule_hrtimeout(&t, HRTIMER_MODE_REL);
253                         sleep_time *= 2;
254                         if (sleep_time > NSEC_PER_MSEC)
255                                 sleep_time = NSEC_PER_MSEC;
256                 }
257
258                 if (intr && signal_pending(current)) {
259                         ret = -ERESTARTSYS;
260                         break;
261                 }
262         }
263
264         __set_current_state(TASK_RUNNING);
265
266         return ret;
267 }
268
269 static struct nouveau_semaphore *
270 semaphore_alloc(struct drm_device *dev)
271 {
272         struct drm_nouveau_private *dev_priv = dev->dev_private;
273         struct nouveau_semaphore *sema;
274         int size = (dev_priv->chipset < 0x84) ? 4 : 16;
275         int ret, i;
276
277         if (!USE_SEMA(dev))
278                 return NULL;
279
280         sema = kmalloc(sizeof(*sema), GFP_KERNEL);
281         if (!sema)
282                 goto fail;
283
284         ret = drm_mm_pre_get(&dev_priv->fence.heap);
285         if (ret)
286                 goto fail;
287
288         spin_lock(&dev_priv->fence.lock);
289         sema->mem = drm_mm_search_free(&dev_priv->fence.heap, size, 0, 0);
290         if (sema->mem)
291                 sema->mem = drm_mm_get_block_atomic(sema->mem, size, 0);
292         spin_unlock(&dev_priv->fence.lock);
293
294         if (!sema->mem)
295                 goto fail;
296
297         kref_init(&sema->ref);
298         sema->dev = dev;
299         for (i = sema->mem->start; i < sema->mem->start + size; i += 4)
300                 nouveau_bo_wr32(dev_priv->fence.bo, i / 4, 0);
301
302         return sema;
303 fail:
304         kfree(sema);
305         return NULL;
306 }
307
308 static void
309 semaphore_free(struct kref *ref)
310 {
311         struct nouveau_semaphore *sema =
312                 container_of(ref, struct nouveau_semaphore, ref);
313         struct drm_nouveau_private *dev_priv = sema->dev->dev_private;
314
315         spin_lock(&dev_priv->fence.lock);
316         drm_mm_put_block(sema->mem);
317         spin_unlock(&dev_priv->fence.lock);
318
319         kfree(sema);
320 }
321
322 static void
323 semaphore_work(void *priv, bool signalled)
324 {
325         struct nouveau_semaphore *sema = priv;
326         struct drm_nouveau_private *dev_priv = sema->dev->dev_private;
327
328         if (unlikely(!signalled))
329                 nouveau_bo_wr32(dev_priv->fence.bo, sema->mem->start / 4, 1);
330
331         kref_put(&sema->ref, semaphore_free);
332 }
333
334 static int
335 semaphore_acquire(struct nouveau_channel *chan, struct nouveau_semaphore *sema)
336 {
337         struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
338         struct nouveau_fence *fence = NULL;
339         int ret;
340
341         if (dev_priv->chipset < 0x84) {
342                 ret = RING_SPACE(chan, 3);
343                 if (ret)
344                         return ret;
345
346                 BEGIN_RING(chan, NvSubSw, NV_SW_SEMAPHORE_OFFSET, 2);
347                 OUT_RING  (chan, sema->mem->start);
348                 OUT_RING  (chan, 1);
349         } else
350         if (dev_priv->chipset < 0xc0) {
351                 struct nouveau_vma *vma = &dev_priv->fence.bo->vma;
352                 u64 offset = vma->offset + sema->mem->start;
353
354                 ret = RING_SPACE(chan, 5);
355                 if (ret)
356                         return ret;
357
358                 BEGIN_RING(chan, NvSubSw, 0x0010, 4);
359                 OUT_RING  (chan, upper_32_bits(offset));
360                 OUT_RING  (chan, lower_32_bits(offset));
361                 OUT_RING  (chan, 1);
362                 OUT_RING  (chan, 1); /* ACQUIRE_EQ */
363         } else {
364                 struct nouveau_vma *vma = &dev_priv->fence.bo->vma;
365                 u64 offset = vma->offset + sema->mem->start;
366
367                 ret = RING_SPACE(chan, 5);
368                 if (ret)
369                         return ret;
370
371                 BEGIN_NVC0(chan, 2, NvSubM2MF, 0x0010, 4);
372                 OUT_RING  (chan, upper_32_bits(offset));
373                 OUT_RING  (chan, lower_32_bits(offset));
374                 OUT_RING  (chan, 1);
375                 OUT_RING  (chan, 0x1001); /* ACQUIRE_EQ */
376         }
377
378         /* Delay semaphore destruction until its work is done */
379         ret = nouveau_fence_new(chan, &fence, true);
380         if (ret)
381                 return ret;
382
383         kref_get(&sema->ref);
384         nouveau_fence_work(fence, semaphore_work, sema);
385         nouveau_fence_unref(&fence);
386         return 0;
387 }
388
389 static int
390 semaphore_release(struct nouveau_channel *chan, struct nouveau_semaphore *sema)
391 {
392         struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
393         struct nouveau_fence *fence = NULL;
394         int ret;
395
396         if (dev_priv->chipset < 0x84) {
397                 ret = RING_SPACE(chan, 4);
398                 if (ret)
399                         return ret;
400
401                 BEGIN_RING(chan, NvSubSw, NV_SW_SEMAPHORE_OFFSET, 1);
402                 OUT_RING  (chan, sema->mem->start);
403                 BEGIN_RING(chan, NvSubSw, NV_SW_SEMAPHORE_RELEASE, 1);
404                 OUT_RING  (chan, 1);
405         } else
406         if (dev_priv->chipset < 0xc0) {
407                 struct nouveau_vma *vma = &dev_priv->fence.bo->vma;
408                 u64 offset = vma->offset + sema->mem->start;
409
410                 ret = RING_SPACE(chan, 5);
411                 if (ret)
412                         return ret;
413
414                 BEGIN_RING(chan, NvSubSw, 0x0010, 4);
415                 OUT_RING  (chan, upper_32_bits(offset));
416                 OUT_RING  (chan, lower_32_bits(offset));
417                 OUT_RING  (chan, 1);
418                 OUT_RING  (chan, 2); /* RELEASE */
419         } else {
420                 struct nouveau_vma *vma = &dev_priv->fence.bo->vma;
421                 u64 offset = vma->offset + sema->mem->start;
422
423                 ret = RING_SPACE(chan, 5);
424                 if (ret)
425                         return ret;
426
427                 BEGIN_NVC0(chan, 2, NvSubM2MF, 0x0010, 4);
428                 OUT_RING  (chan, upper_32_bits(offset));
429                 OUT_RING  (chan, lower_32_bits(offset));
430                 OUT_RING  (chan, 1);
431                 OUT_RING  (chan, 0x1002); /* RELEASE */
432         }
433
434         /* Delay semaphore destruction until its work is done */
435         ret = nouveau_fence_new(chan, &fence, true);
436         if (ret)
437                 return ret;
438
439         kref_get(&sema->ref);
440         nouveau_fence_work(fence, semaphore_work, sema);
441         nouveau_fence_unref(&fence);
442         return 0;
443 }
444
445 int
446 nouveau_fence_sync(struct nouveau_fence *fence,
447                    struct nouveau_channel *wchan)
448 {
449         struct nouveau_channel *chan = nouveau_fence_channel(fence);
450         struct drm_device *dev = wchan->dev;
451         struct nouveau_semaphore *sema;
452         int ret = 0;
453
454         if (likely(!chan || chan == wchan ||
455                    nouveau_fence_signalled(fence)))
456                 goto out;
457
458         sema = semaphore_alloc(dev);
459         if (!sema) {
460                 /* Early card or broken userspace, fall back to
461                  * software sync. */
462                 ret = nouveau_fence_wait(fence, true, false);
463                 goto out;
464         }
465
466         /* try to take chan's mutex, if we can't take it right away
467          * we have to fallback to software sync to prevent locking
468          * order issues
469          */
470         if (!mutex_trylock(&chan->mutex)) {
471                 ret = nouveau_fence_wait(fence, true, false);
472                 goto out_unref;
473         }
474
475         /* Make wchan wait until it gets signalled */
476         ret = semaphore_acquire(wchan, sema);
477         if (ret)
478                 goto out_unlock;
479
480         /* Signal the semaphore from chan */
481         ret = semaphore_release(chan, sema);
482
483 out_unlock:
484         mutex_unlock(&chan->mutex);
485 out_unref:
486         kref_put(&sema->ref, semaphore_free);
487 out:
488         if (chan)
489                 nouveau_channel_put_unlocked(&chan);
490         return ret;
491 }
492
493 int
494 __nouveau_fence_flush(void *sync_obj, void *sync_arg)
495 {
496         return 0;
497 }
498
499 int
500 nouveau_fence_channel_init(struct nouveau_channel *chan)
501 {
502         struct drm_device *dev = chan->dev;
503         struct drm_nouveau_private *dev_priv = dev->dev_private;
504         struct nouveau_gpuobj *obj = NULL;
505         int ret;
506
507         if (dev_priv->card_type >= NV_C0)
508                 goto out_initialised;
509
510         /* Create an NV_SW object for various sync purposes */
511         ret = nouveau_gpuobj_gr_new(chan, NvSw, NV_SW);
512         if (ret)
513                 return ret;
514
515         /* we leave subchannel empty for nvc0 */
516         ret = RING_SPACE(chan, 2);
517         if (ret)
518                 return ret;
519         BEGIN_RING(chan, NvSubSw, 0, 1);
520         OUT_RING(chan, NvSw);
521
522         /* Create a DMA object for the shared cross-channel sync area. */
523         if (USE_SEMA(dev) && dev_priv->chipset < 0x84) {
524                 struct ttm_mem_reg *mem = &dev_priv->fence.bo->bo.mem;
525
526                 ret = nouveau_gpuobj_dma_new(chan, NV_CLASS_DMA_IN_MEMORY,
527                                              mem->start << PAGE_SHIFT,
528                                              mem->size, NV_MEM_ACCESS_RW,
529                                              NV_MEM_TARGET_VRAM, &obj);
530                 if (ret)
531                         return ret;
532
533                 ret = nouveau_ramht_insert(chan, NvSema, obj);
534                 nouveau_gpuobj_ref(NULL, &obj);
535                 if (ret)
536                         return ret;
537
538                 ret = RING_SPACE(chan, 2);
539                 if (ret)
540                         return ret;
541                 BEGIN_RING(chan, NvSubSw, NV_SW_DMA_SEMAPHORE, 1);
542                 OUT_RING(chan, NvSema);
543         } else {
544                 ret = RING_SPACE(chan, 2);
545                 if (ret)
546                         return ret;
547                 BEGIN_RING(chan, NvSubSw, NV_SW_DMA_SEMAPHORE, 1);
548                 OUT_RING  (chan, chan->vram_handle); /* whole VM */
549         }
550
551         FIRE_RING(chan);
552
553 out_initialised:
554         INIT_LIST_HEAD(&chan->fence.pending);
555         spin_lock_init(&chan->fence.lock);
556         atomic_set(&chan->fence.last_sequence_irq, 0);
557         return 0;
558 }
559
560 void
561 nouveau_fence_channel_fini(struct nouveau_channel *chan)
562 {
563         struct nouveau_fence *tmp, *fence;
564
565         spin_lock(&chan->fence.lock);
566
567         list_for_each_entry_safe(fence, tmp, &chan->fence.pending, entry) {
568                 fence->signalled = true;
569                 list_del(&fence->entry);
570
571                 if (unlikely(fence->work))
572                         fence->work(fence->priv, false);
573
574                 kref_put(&fence->refcount, nouveau_fence_del);
575         }
576
577         spin_unlock(&chan->fence.lock);
578 }
579
580 int
581 nouveau_fence_init(struct drm_device *dev)
582 {
583         struct drm_nouveau_private *dev_priv = dev->dev_private;
584         int size = (dev_priv->chipset < 0x84) ? 4096 : 16384;
585         int ret;
586
587         /* Create a shared VRAM heap for cross-channel sync. */
588         if (USE_SEMA(dev)) {
589                 ret = nouveau_bo_new(dev, NULL, size, 0, TTM_PL_FLAG_VRAM,
590                                      0, 0, &dev_priv->fence.bo);
591                 if (ret)
592                         return ret;
593
594                 ret = nouveau_bo_pin(dev_priv->fence.bo, TTM_PL_FLAG_VRAM);
595                 if (ret)
596                         goto fail;
597
598                 ret = nouveau_bo_map(dev_priv->fence.bo);
599                 if (ret)
600                         goto fail;
601
602                 ret = drm_mm_init(&dev_priv->fence.heap, 0,
603                                   dev_priv->fence.bo->bo.mem.size);
604                 if (ret)
605                         goto fail;
606
607                 spin_lock_init(&dev_priv->fence.lock);
608         }
609
610         return 0;
611 fail:
612         nouveau_bo_unmap(dev_priv->fence.bo);
613         nouveau_bo_ref(NULL, &dev_priv->fence.bo);
614         return ret;
615 }
616
617 void
618 nouveau_fence_fini(struct drm_device *dev)
619 {
620         struct drm_nouveau_private *dev_priv = dev->dev_private;
621
622         if (USE_SEMA(dev)) {
623                 drm_mm_takedown(&dev_priv->fence.heap);
624                 nouveau_bo_unmap(dev_priv->fence.bo);
625                 nouveau_bo_unpin(dev_priv->fence.bo);
626                 nouveau_bo_ref(NULL, &dev_priv->fence.bo);
627         }
628 }