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 "amdgpu.h"
  32 #include "amdgpu_trace.h"
  33 #include "amdgpu_amdkfd.h"
  34
  35 struct amdgpu_sync_entry {
  36         struct hlist_node       node;
  37         struct dma_fence        *fence;
  38         bool    explicit;
  39 };
  40
  41 static struct kmem_cache *amdgpu_sync_slab;
  42
  43 /**
  44  * amdgpu_sync_create - zero init sync object
  45  *
  46  * @sync: sync object to initialize
  47  *
  48  * Just clear the sync object for now.
  49  */
  50 void amdgpu_sync_create(struct amdgpu_sync *sync)
  51 {
  52         hash_init(sync->fences);
  53         sync->last_vm_update = NULL;
  54 }
  55
  56 /**
  57  * amdgpu_sync_same_dev - test if fence belong to us
  58  *
  59  * @adev: amdgpu device to use for the test
  60  * @f: fence to test
  61  *
  62  * Test if the fence was issued by us.
  63  */
  64 static bool amdgpu_sync_same_dev(struct amdgpu_device *adev,
  65                                  struct dma_fence *f)
  66 {
  67         struct drm_sched_fence *s_fence = to_drm_sched_fence(f);
  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 /**
  80  * amdgpu_sync_get_owner - extract the owner of a fence
  81  *
  82  * @fence: fence get the owner from
  83  *
  84  * Extract who originally created the fence.
  85  */
  86 static void *amdgpu_sync_get_owner(struct dma_fence *f)
  87 {
  88         struct drm_sched_fence *s_fence;
  89         struct amdgpu_amdkfd_fence *kfd_fence;
  90
  91         if (!f)
  92                 return AMDGPU_FENCE_OWNER_UNDEFINED;
  93
  94         s_fence = to_drm_sched_fence(f);
  95         if (s_fence)
  96                 return s_fence->owner;
  97
  98         kfd_fence = to_amdgpu_amdkfd_fence(f);
  99         if (kfd_fence)
 100                 return AMDGPU_FENCE_OWNER_KFD;
 101
 102         return AMDGPU_FENCE_OWNER_UNDEFINED;
 103 }
 104
 105 /**
 106  * amdgpu_sync_keep_later - Keep the later fence
 107  *
 108  * @keep: existing fence to test
 109  * @fence: new fence
 110  *
 111  * Either keep the existing fence or the new one, depending which one is later.
 112  */
 113 static void amdgpu_sync_keep_later(struct dma_fence **keep,
 114                                    struct dma_fence *fence)
 115 {
 116         if (*keep && dma_fence_is_later(*keep, fence))
 117                 return;
 118
 119         dma_fence_put(*keep);
 120         *keep = dma_fence_get(fence);
 121 }
 122
 123 /**
 124  * amdgpu_sync_add_later - add the fence to the hash
 125  *
 126  * @sync: sync object to add the fence to
 127  * @f: fence to add
 128  *
 129  * Tries to add the fence to an existing hash entry. Returns true when an entry
 130  * was found, false otherwise.
 131  */
 132 static bool amdgpu_sync_add_later(struct amdgpu_sync *sync, struct dma_fence *f,
 133                                   bool explicit)
 134 {
 135         struct amdgpu_sync_entry *e;
 136
 137         hash_for_each_possible(sync->fences, e, node, f->context) {
 138                 if (unlikely(e->fence->context != f->context))
 139                         continue;
 140
 141                 amdgpu_sync_keep_later(&e->fence, f);
 142
 143                 /* Preserve eplicit flag to not loose pipe line sync */
 144                 e->explicit |= explicit;
 145
 146                 return true;
 147         }
 148         return false;
 149 }
 150
 151 /**
 152  * amdgpu_sync_fence - remember to sync to this fence
 153  *
 154  * @sync: sync object to add fence to
 155  * @f: fence to sync to
 156  * @explicit: if this is an explicit dependency
 157  *
 158  * Add the fence to the sync object.
 159  */
 160 int amdgpu_sync_fence(struct amdgpu_sync *sync, struct dma_fence *f,
 161                       bool explicit)
 162 {
 163         struct amdgpu_sync_entry *e;
 164
 165         if (!f)
 166                 return 0;
 167
 168         if (amdgpu_sync_add_later(sync, f, explicit))
 169                 return 0;
 170
 171         e = kmem_cache_alloc(amdgpu_sync_slab, GFP_KERNEL);
 172         if (!e)
 173                 return -ENOMEM;
 174
 175         e->explicit = explicit;
 176
 177         hash_add(sync->fences, &e->node, f->context);
 178         e->fence = dma_fence_get(f);
 179         return 0;
 180 }
 181
 182 /**
 183  * amdgpu_sync_vm_fence - remember to sync to this VM fence
 184  *
 185  * @adev: amdgpu device
 186  * @sync: sync object to add fence to
 187  * @fence: the VM fence to add
 188  *
 189  * Add the fence to the sync object and remember it as VM update.
 190  */
 191 int amdgpu_sync_vm_fence(struct amdgpu_sync *sync, struct dma_fence *fence)
 192 {
 193         if (!fence)
 194                 return 0;
 195
 196         amdgpu_sync_keep_later(&sync->last_vm_update, fence);
 197         return amdgpu_sync_fence(sync, fence, false);
 198 }
 199
 200 /**
 201  * amdgpu_sync_resv - sync to a reservation object
 202  *
 203  * @sync: sync object to add fences from reservation object to
 204  * @resv: reservation object with embedded fence
 205  * @mode: how owner affects which fences we sync to
 206  * @owner: owner of the planned job submission
 207  *
 208  * Sync to the fence
 209  */
 210 int amdgpu_sync_resv(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 211                      struct dma_resv *resv, enum amdgpu_sync_mode mode,
 212                      void *owner)
 213 {
 214         struct dma_resv_list *flist;
 215         struct dma_fence *f;
 216         unsigned i;
 217         int r = 0;
 218
 219         if (resv == NULL)
 220                 return -EINVAL;
 221
 222         /* always sync to the exclusive fence */
 223         f = dma_resv_get_excl(resv);
 224         r = amdgpu_sync_fence(sync, f, false);
 225
 226         flist = dma_resv_get_list(resv);
 227         if (!flist || r)
 228                 return r;
 229
 230         for (i = 0; i < flist->shared_count; ++i) {
 231                 void *fence_owner;
 232
 233                 f = rcu_dereference_protected(flist->shared[i],
 234                                               dma_resv_held(resv));
 235
 236                 fence_owner = amdgpu_sync_get_owner(f);
 237
 238                 /* Always sync to moves, no matter what */
 239                 if (fence_owner == AMDGPU_FENCE_OWNER_UNDEFINED) {
 240                         r = amdgpu_sync_fence(sync, f, false);
 241                         if (r)
 242                                 break;
 243                 }
 244
 245                 /* We only want to trigger KFD eviction fences on
 246                  * evict or move jobs. Skip KFD fences otherwise.
 247                  */
 248                 if (fence_owner == AMDGPU_FENCE_OWNER_KFD &&
 249                     owner != AMDGPU_FENCE_OWNER_UNDEFINED)
 250                         continue;
 251
 252                 /* Ignore fences depending on the sync mode */
 253                 switch (mode) {
 254                 case AMDGPU_SYNC_ALWAYS:
 255                         break;
 256
 257                 case AMDGPU_SYNC_NE_OWNER:
 258                         if (amdgpu_sync_same_dev(adev, f) &&
 259                             fence_owner == owner)
 260                                 continue;
 261                         break;
 262
 263                 case AMDGPU_SYNC_EQ_OWNER:
 264                         if (amdgpu_sync_same_dev(adev, f) &&
 265                             fence_owner != owner)
 266                                 continue;
 267                         break;
 268
 269                 case AMDGPU_SYNC_EXPLICIT:
 270                         continue;
 271                 }
 272
 273                 r = amdgpu_sync_fence(sync, f, false);
 274                 if (r)
 275                         break;
 276         }
 277         return r;
 278 }
 279
 280 /**
 281  * amdgpu_sync_peek_fence - get the next fence not signaled yet
 282  *
 283  * @sync: the sync object
 284  * @ring: optional ring to use for test
 285  *
 286  * Returns the next fence not signaled yet without removing it from the sync
 287  * object.
 288  */
 289 struct dma_fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync,
 290                                          struct amdgpu_ring *ring)
 291 {
 292         struct amdgpu_sync_entry *e;
 293         struct hlist_node *tmp;
 294         int i;
 295
 296         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 297                 struct dma_fence *f = e->fence;
 298                 struct drm_sched_fence *s_fence = to_drm_sched_fence(f);
 299
 300                 if (dma_fence_is_signaled(f)) {
 301                         hash_del(&e->node);
 302                         dma_fence_put(f);
 303                         kmem_cache_free(amdgpu_sync_slab, e);
 304                         continue;
 305                 }
 306                 if (ring && s_fence) {
 307                         /* For fences from the same ring it is sufficient
 308                          * when they are scheduled.
 309                          */
 310                         if (s_fence->sched == &ring->sched) {
 311                                 if (dma_fence_is_signaled(&s_fence->scheduled))
 312                                         continue;
 313
 314                                 return &s_fence->scheduled;
 315                         }
 316                 }
 317
 318                 return f;
 319         }
 320
 321         return NULL;
 322 }
 323
 324 /**
 325  * amdgpu_sync_get_fence - get the next fence from the sync object
 326  *
 327  * @sync: sync object to use
 328  * @explicit: true if the next fence is explicit
 329  *
 330  * Get and removes the next fence from the sync object not signaled yet.
 331  */
 332 struct dma_fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync, bool *explicit)
 333 {
 334         struct amdgpu_sync_entry *e;
 335         struct hlist_node *tmp;
 336         struct dma_fence *f;
 337         int i;
 338         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 339
 340                 f = e->fence;
 341                 if (explicit)
 342                         *explicit = e->explicit;
 343
 344                 hash_del(&e->node);
 345                 kmem_cache_free(amdgpu_sync_slab, e);
 346
 347                 if (!dma_fence_is_signaled(f))
 348                         return f;
 349
 350                 dma_fence_put(f);
 351         }
 352         return NULL;
 353 }
 354
 355 /**
 356  * amdgpu_sync_clone - clone a sync object
 357  *
 358  * @source: sync object to clone
 359  * @clone: pointer to destination sync object
 360  *
 361  * Adds references to all unsignaled fences in @source to @clone. Also
 362  * removes signaled fences from @source while at it.
 363  */
 364 int amdgpu_sync_clone(struct amdgpu_sync *source, struct amdgpu_sync *clone)
 365 {
 366         struct amdgpu_sync_entry *e;
 367         struct hlist_node *tmp;
 368         struct dma_fence *f;
 369         int i, r;
 370
 371         hash_for_each_safe(source->fences, i, tmp, e, node) {
 372                 f = e->fence;
 373                 if (!dma_fence_is_signaled(f)) {
 374                         r = amdgpu_sync_fence(clone, f, e->explicit);
 375                         if (r)
 376                                 return r;
 377                 } else {
 378                         hash_del(&e->node);
 379                         dma_fence_put(f);
 380                         kmem_cache_free(amdgpu_sync_slab, e);
 381                 }
 382         }
 383
 384         dma_fence_put(clone->last_vm_update);
 385         clone->last_vm_update = dma_fence_get(source->last_vm_update);
 386
 387         return 0;
 388 }
 389
 390 int amdgpu_sync_wait(struct amdgpu_sync *sync, bool intr)
 391 {
 392         struct amdgpu_sync_entry *e;
 393         struct hlist_node *tmp;
 394         int i, r;
 395
 396         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 397                 r = dma_fence_wait(e->fence, intr);
 398                 if (r)
 399                         return r;
 400
 401                 hash_del(&e->node);
 402                 dma_fence_put(e->fence);
 403                 kmem_cache_free(amdgpu_sync_slab, e);
 404         }
 405
 406         return 0;
 407 }
 408
 409 /**
 410  * amdgpu_sync_free - free the sync object
 411  *
 412  * @sync: sync object to use
 413  *
 414  * Free the sync object.
 415  */
 416 void amdgpu_sync_free(struct amdgpu_sync *sync)
 417 {
 418         struct amdgpu_sync_entry *e;
 419         struct hlist_node *tmp;
 420         unsigned i;
 421
 422         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 423                 hash_del(&e->node);
 424                 dma_fence_put(e->fence);
 425                 kmem_cache_free(amdgpu_sync_slab, e);
 426         }
 427
 428         dma_fence_put(sync->last_vm_update);
 429 }
 430
 431 /**
 432  * amdgpu_sync_init - init sync object subsystem
 433  *
 434  * Allocate the slab allocator.
 435  */
 436 int amdgpu_sync_init(void)
 437 {
 438         amdgpu_sync_slab = kmem_cache_create(
 439                 "amdgpu_sync", sizeof(struct amdgpu_sync_entry), 0,
 440                 SLAB_HWCACHE_ALIGN, NULL);
 441         if (!amdgpu_sync_slab)
 442                 return -ENOMEM;
 443
 444         return 0;
 445 }
 446
 447 /**
 448  * amdgpu_sync_fini - fini sync object subsystem
 449  *
 450  * Free the slab allocator.
 451  */
 452 void amdgpu_sync_fini(void)
 453 {
 454         kmem_cache_destroy(amdgpu_sync_slab);
 455 }