drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c

   1 /*
   2  * Copyright 2014 Advanced Micro Devices, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * 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, sub license, 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 SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * The above copyright notice and this permission notice (including the
  22  * next paragraph) shall be included in all copies or substantial portions
  23  * of the Software.
  24  *
  25  */
  26 /*
  27  * Authors:
  28  *    Christian König <christian.koenig@amd.com>
  29  */
  30
  31 #include <drm/drmP.h>
  32 #include "amdgpu.h"
  33 #include "amdgpu_trace.h"
  34
  35 struct amdgpu_sync_entry {
  36         struct hlist_node       node;
  37         struct fence            *fence;
  38 };
  39
  40 /**
  41  * amdgpu_sync_create - zero init sync object
  42  *
  43  * @sync: sync object to initialize
  44  *
  45  * Just clear the sync object for now.
  46  */
  47 void amdgpu_sync_create(struct amdgpu_sync *sync)
  48 {
  49         unsigned i;
  50
  51         for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
  52                 sync->semaphores[i] = NULL;
  53
  54         for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
  55                 sync->sync_to[i] = NULL;
  56
  57         hash_init(sync->fences);
  58         sync->last_vm_update = NULL;
  59 }
  60
  61 static bool amdgpu_sync_same_dev(struct amdgpu_device *adev, struct fence *f)
  62 {
  63         struct amdgpu_fence *a_fence = to_amdgpu_fence(f);
  64         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
  65
  66         if (a_fence)
  67                 return a_fence->ring->adev == adev;
  68
  69         if (s_fence) {
  70                 struct amdgpu_ring *ring;
  71
  72                 ring = container_of(s_fence->sched, struct amdgpu_ring, sched);
  73                 return ring->adev == adev;
  74         }
  75
  76         return false;
  77 }
  78
  79 static bool amdgpu_sync_test_owner(struct fence *f, void *owner)
  80 {
  81         struct amdgpu_fence *a_fence = to_amdgpu_fence(f);
  82         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
  83         if (s_fence)
  84                 return s_fence->owner == owner;
  85         if (a_fence)
  86                 return a_fence->owner == owner;
  87         return false;
  88 }
  89
  90 static void amdgpu_sync_keep_later(struct fence **keep, struct fence *fence)
  91 {
  92         if (*keep && fence_is_later(*keep, fence))
  93                 return;
  94
  95         fence_put(*keep);
  96         *keep = fence_get(fence);
  97 }
  98
  99 /**
 100  * amdgpu_sync_fence - remember to sync to this fence
 101  *
 102  * @sync: sync object to add fence to
 103  * @fence: fence to sync to
 104  *
 105  */
 106 int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 107                       struct fence *f)
 108 {
 109         struct amdgpu_sync_entry *e;
 110         struct amdgpu_fence *fence;
 111
 112         if (!f)
 113                 return 0;
 114
 115         if (amdgpu_sync_same_dev(adev, f) &&
 116             amdgpu_sync_test_owner(f, AMDGPU_FENCE_OWNER_VM))
 117                 amdgpu_sync_keep_later(&sync->last_vm_update, f);
 118
 119         fence = to_amdgpu_fence(f);
 120         if (!fence || fence->ring->adev != adev) {
 121                 hash_for_each_possible(sync->fences, e, node, f->context) {
 122                         if (unlikely(e->fence->context != f->context))
 123                                 continue;
 124
 125                         amdgpu_sync_keep_later(&e->fence, f);
 126                         return 0;
 127                 }
 128
 129                 e = kmalloc(sizeof(struct amdgpu_sync_entry), GFP_KERNEL);
 130                 if (!e)
 131                         return -ENOMEM;
 132
 133                 hash_add(sync->fences, &e->node, f->context);
 134                 e->fence = fence_get(f);
 135                 return 0;
 136         }
 137
 138         amdgpu_sync_keep_later(&sync->sync_to[fence->ring->idx], f);
 139
 140         return 0;
 141 }
 142
 143 static void *amdgpu_sync_get_owner(struct fence *f)
 144 {
 145         struct amdgpu_fence *a_fence = to_amdgpu_fence(f);
 146         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
 147
 148         if (s_fence)
 149                 return s_fence->owner;
 150         else if (a_fence)
 151                 return a_fence->owner;
 152         return AMDGPU_FENCE_OWNER_UNDEFINED;
 153 }
 154
 155 /**
 156  * amdgpu_sync_resv - use the semaphores to sync to a reservation object
 157  *
 158  * @sync: sync object to add fences from reservation object to
 159  * @resv: reservation object with embedded fence
 160  * @shared: true if we should only sync to the exclusive fence
 161  *
 162  * Sync to the fence using the semaphore objects
 163  */
 164 int amdgpu_sync_resv(struct amdgpu_device *adev,
 165                      struct amdgpu_sync *sync,
 166                      struct reservation_object *resv,
 167                      void *owner)
 168 {
 169         struct reservation_object_list *flist;
 170         struct fence *f;
 171         void *fence_owner;
 172         unsigned i;
 173         int r = 0;
 174
 175         if (resv == NULL)
 176                 return -EINVAL;
 177
 178         /* always sync to the exclusive fence */
 179         f = reservation_object_get_excl(resv);
 180         r = amdgpu_sync_fence(adev, sync, f);
 181
 182         flist = reservation_object_get_list(resv);
 183         if (!flist || r)
 184                 return r;
 185
 186         for (i = 0; i < flist->shared_count; ++i) {
 187                 f = rcu_dereference_protected(flist->shared[i],
 188                                               reservation_object_held(resv));
 189                 if (amdgpu_sync_same_dev(adev, f)) {
 190                         /* VM updates are only interesting
 191                          * for other VM updates and moves.
 192                          */
 193                         fence_owner = amdgpu_sync_get_owner(f);
 194                         if ((owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 195                             (fence_owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 196                             ((owner == AMDGPU_FENCE_OWNER_VM) !=
 197                              (fence_owner == AMDGPU_FENCE_OWNER_VM)))
 198                                 continue;
 199
 200                         /* Ignore fence from the same owner as
 201                          * long as it isn't undefined.
 202                          */
 203                         if (owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
 204                             fence_owner == owner)
 205                                 continue;
 206                 }
 207
 208                 r = amdgpu_sync_fence(adev, sync, f);
 209                 if (r)
 210                         break;
 211         }
 212         return r;
 213 }
 214
 215 struct fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync)
 216 {
 217         struct amdgpu_sync_entry *e;
 218         struct hlist_node *tmp;
 219         struct fence *f;
 220         int i;
 221
 222         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 223
 224                 f = e->fence;
 225
 226                 hash_del(&e->node);
 227                 kfree(e);
 228
 229                 if (!fence_is_signaled(f))
 230                         return f;
 231
 232                 fence_put(f);
 233         }
 234         return NULL;
 235 }
 236
 237 int amdgpu_sync_wait(struct amdgpu_sync *sync)
 238 {
 239         struct amdgpu_sync_entry *e;
 240         struct hlist_node *tmp;
 241         int i, r;
 242
 243         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 244                 r = fence_wait(e->fence, false);
 245                 if (r)
 246                         return r;
 247
 248                 hash_del(&e->node);
 249                 fence_put(e->fence);
 250                 kfree(e);
 251         }
 252
 253         if (amdgpu_enable_semaphores)
 254                 return 0;
 255
 256         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 257                 struct fence *fence = sync->sync_to[i];
 258                 if (!fence)
 259                         continue;
 260
 261                 r = fence_wait(fence, false);
 262                 if (r)
 263                         return r;
 264         }
 265
 266         return 0;
 267 }
 268
 269 /**
 270  * amdgpu_sync_rings - sync ring to all registered fences
 271  *
 272  * @sync: sync object to use
 273  * @ring: ring that needs sync
 274  *
 275  * Ensure that all registered fences are signaled before letting
 276  * the ring continue. The caller must hold the ring lock.
 277  */
 278 int amdgpu_sync_rings(struct amdgpu_sync *sync,
 279                       struct amdgpu_ring *ring)
 280 {
 281         struct amdgpu_device *adev = ring->adev;
 282         unsigned count = 0;
 283         int i, r;
 284
 285         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 286                 struct amdgpu_ring *other = adev->rings[i];
 287                 struct amdgpu_semaphore *semaphore;
 288                 struct amdgpu_fence *fence;
 289
 290                 if (!sync->sync_to[i])
 291                         continue;
 292
 293                 fence = to_amdgpu_fence(sync->sync_to[i]);
 294
 295                 /* check if we really need to sync */
 296                 if (!amdgpu_fence_need_sync(fence, ring))
 297                         continue;
 298
 299                 /* prevent GPU deadlocks */
 300                 if (!other->ready) {
 301                         dev_err(adev->dev, "Syncing to a disabled ring!");
 302                         return -EINVAL;
 303                 }
 304
 305                 if (amdgpu_enable_scheduler || !amdgpu_enable_semaphores ||
 306                     (count >= AMDGPU_NUM_SYNCS)) {
 307                         /* not enough room, wait manually */
 308                         r = fence_wait(&fence->base, false);
 309                         if (r)
 310                                 return r;
 311                         continue;
 312                 }
 313                 r = amdgpu_semaphore_create(adev, &semaphore);
 314                 if (r)
 315                         return r;
 316
 317                 sync->semaphores[count++] = semaphore;
 318
 319                 /* allocate enough space for sync command */
 320                 r = amdgpu_ring_alloc(other, 16);
 321                 if (r)
 322                         return r;
 323
 324                 /* emit the signal semaphore */
 325                 if (!amdgpu_semaphore_emit_signal(other, semaphore)) {
 326                         /* signaling wasn't successful wait manually */
 327                         amdgpu_ring_undo(other);
 328                         r = fence_wait(&fence->base, false);
 329                         if (r)
 330                                 return r;
 331                         continue;
 332                 }
 333
 334                 /* we assume caller has already allocated space on waiters ring */
 335                 if (!amdgpu_semaphore_emit_wait(ring, semaphore)) {
 336                         /* waiting wasn't successful wait manually */
 337                         amdgpu_ring_undo(other);
 338                         r = fence_wait(&fence->base, false);
 339                         if (r)
 340                                 return r;
 341                         continue;
 342                 }
 343
 344                 amdgpu_ring_commit(other);
 345                 amdgpu_fence_note_sync(fence, ring);
 346         }
 347
 348         return 0;
 349 }
 350
 351 /**
 352  * amdgpu_sync_free - free the sync object
 353  *
 354  * @adev: amdgpu_device pointer
 355  * @sync: sync object to use
 356  * @fence: fence to use for the free
 357  *
 358  * Free the sync object by freeing all semaphores in it.
 359  */
 360 void amdgpu_sync_free(struct amdgpu_device *adev,
 361                       struct amdgpu_sync *sync,
 362                       struct fence *fence)
 363 {
 364         struct amdgpu_sync_entry *e;
 365         struct hlist_node *tmp;
 366         unsigned i;
 367
 368         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 369                 hash_del(&e->node);
 370                 fence_put(e->fence);
 371                 kfree(e);
 372         }
 373
 374         for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
 375                 amdgpu_semaphore_free(adev, &sync->semaphores[i], fence);
 376
 377         for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
 378                 fence_put(sync->sync_to[i]);
 379
 380         fence_put(sync->last_vm_update);
 381 }