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 <[email protected]>
  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 };
  39
  40 static struct kmem_cache *amdgpu_sync_slab;
  41
  42 /**
  43  * amdgpu_sync_create - zero init sync object
  44  *
  45  * @sync: sync object to initialize
  46  *
  47  * Just clear the sync object for now.
  48  */
  49 void amdgpu_sync_create(struct amdgpu_sync *sync)
  50 {
  51         hash_init(sync->fences);
  52         sync->last_vm_update = NULL;
  53 }
  54
  55 /**
  56  * amdgpu_sync_same_dev - test if fence belong to us
  57  *
  58  * @adev: amdgpu device to use for the test
  59  * @f: fence to test
  60  *
  61  * Test if the fence was issued by us.
  62  */
  63 static bool amdgpu_sync_same_dev(struct amdgpu_device *adev,
  64                                  struct dma_fence *f)
  65 {
  66         struct drm_sched_fence *s_fence = to_drm_sched_fence(f);
  67
  68         if (s_fence) {
  69                 struct amdgpu_ring *ring;
  70
  71                 ring = container_of(s_fence->sched, struct amdgpu_ring, sched);
  72                 return ring->adev == adev;
  73         }
  74
  75         return false;
  76 }
  77
  78 /**
  79  * amdgpu_sync_get_owner - extract the owner of a fence
  80  *
  81  * @fence: fence get the owner from
  82  *
  83  * Extract who originally created the fence.
  84  */
  85 static void *amdgpu_sync_get_owner(struct dma_fence *f)
  86 {
  87         struct drm_sched_fence *s_fence;
  88         struct amdgpu_amdkfd_fence *kfd_fence;
  89
  90         if (!f)
  91                 return AMDGPU_FENCE_OWNER_UNDEFINED;
  92
  93         s_fence = to_drm_sched_fence(f);
  94         if (s_fence)
  95                 return s_fence->owner;
  96
  97         kfd_fence = to_amdgpu_amdkfd_fence(f);
  98         if (kfd_fence)
  99                 return AMDGPU_FENCE_OWNER_KFD;
 100
 101         return AMDGPU_FENCE_OWNER_UNDEFINED;
 102 }
 103
 104 /**
 105  * amdgpu_sync_keep_later - Keep the later fence
 106  *
 107  * @keep: existing fence to test
 108  * @fence: new fence
 109  *
 110  * Either keep the existing fence or the new one, depending which one is later.
 111  */
 112 static void amdgpu_sync_keep_later(struct dma_fence **keep,
 113                                    struct dma_fence *fence)
 114 {
 115         if (*keep && dma_fence_is_later(*keep, fence))
 116                 return;
 117
 118         dma_fence_put(*keep);
 119         *keep = dma_fence_get(fence);
 120 }
 121
 122 /**
 123  * amdgpu_sync_add_later - add the fence to the hash
 124  *
 125  * @sync: sync object to add the fence to
 126  * @f: fence to add
 127  *
 128  * Tries to add the fence to an existing hash entry. Returns true when an entry
 129  * was found, false otherwise.
 130  */
 131 static bool amdgpu_sync_add_later(struct amdgpu_sync *sync, struct dma_fence *f)
 132 {
 133         struct amdgpu_sync_entry *e;
 134
 135         hash_for_each_possible(sync->fences, e, node, f->context) {
 136                 if (unlikely(e->fence->context != f->context))
 137                         continue;
 138
 139                 amdgpu_sync_keep_later(&e->fence, f);
 140                 return true;
 141         }
 142         return false;
 143 }
 144
 145 /**
 146  * amdgpu_sync_fence - remember to sync to this fence
 147  *
 148  * @sync: sync object to add fence to
 149  * @f: fence to sync to
 150  *
 151  * Add the fence to the sync object.
 152  */
 153 int amdgpu_sync_fence(struct amdgpu_sync *sync, struct dma_fence *f)
 154 {
 155         struct amdgpu_sync_entry *e;
 156
 157         if (!f)
 158                 return 0;
 159
 160         if (amdgpu_sync_add_later(sync, f))
 161                 return 0;
 162
 163         e = kmem_cache_alloc(amdgpu_sync_slab, GFP_KERNEL);
 164         if (!e)
 165                 return -ENOMEM;
 166
 167         hash_add(sync->fences, &e->node, f->context);
 168         e->fence = dma_fence_get(f);
 169         return 0;
 170 }
 171
 172 /**
 173  * amdgpu_sync_vm_fence - remember to sync to this VM fence
 174  *
 175  * @adev: amdgpu device
 176  * @sync: sync object to add fence to
 177  * @fence: the VM fence to add
 178  *
 179  * Add the fence to the sync object and remember it as VM update.
 180  */
 181 int amdgpu_sync_vm_fence(struct amdgpu_sync *sync, struct dma_fence *fence)
 182 {
 183         if (!fence)
 184                 return 0;
 185
 186         amdgpu_sync_keep_later(&sync->last_vm_update, fence);
 187         return amdgpu_sync_fence(sync, fence);
 188 }
 189
 190 /**
 191  * amdgpu_sync_resv - sync to a reservation object
 192  *
 193  * @sync: sync object to add fences from reservation object to
 194  * @resv: reservation object with embedded fence
 195  * @mode: how owner affects which fences we sync to
 196  * @owner: owner of the planned job submission
 197  *
 198  * Sync to the fence
 199  */
 200 int amdgpu_sync_resv(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 201                      struct dma_resv *resv, enum amdgpu_sync_mode mode,
 202                      void *owner)
 203 {
 204         struct dma_resv_list *flist;
 205         struct dma_fence *f;
 206         unsigned i;
 207         int r = 0;
 208
 209         if (resv == NULL)
 210                 return -EINVAL;
 211
 212         /* always sync to the exclusive fence */
 213         f = dma_resv_get_excl(resv);
 214         r = amdgpu_sync_fence(sync, f);
 215
 216         flist = dma_resv_get_list(resv);
 217         if (!flist || r)
 218                 return r;
 219
 220         for (i = 0; i < flist->shared_count; ++i) {
 221                 void *fence_owner;
 222
 223                 f = rcu_dereference_protected(flist->shared[i],
 224                                               dma_resv_held(resv));
 225
 226                 fence_owner = amdgpu_sync_get_owner(f);
 227
 228                 /* Always sync to moves, no matter what */
 229                 if (fence_owner == AMDGPU_FENCE_OWNER_UNDEFINED) {
 230                         r = amdgpu_sync_fence(sync, f);
 231                         if (r)
 232                                 break;
 233                 }
 234
 235                 /* We only want to trigger KFD eviction fences on
 236                  * evict or move jobs. Skip KFD fences otherwise.
 237                  */
 238                 if (fence_owner == AMDGPU_FENCE_OWNER_KFD &&
 239                     owner != AMDGPU_FENCE_OWNER_UNDEFINED)
 240                         continue;
 241
 242                 /* Never sync to VM updates either. */
 243                 if (fence_owner == AMDGPU_FENCE_OWNER_VM &&
 244                     owner != AMDGPU_FENCE_OWNER_UNDEFINED)
 245                         continue;
 246
 247                 /* Ignore fences depending on the sync mode */
 248                 switch (mode) {
 249                 case AMDGPU_SYNC_ALWAYS:
 250                         break;
 251
 252                 case AMDGPU_SYNC_NE_OWNER:
 253                         if (amdgpu_sync_same_dev(adev, f) &&
 254                             fence_owner == owner)
 255                                 continue;
 256                         break;
 257
 258                 case AMDGPU_SYNC_EQ_OWNER:
 259                         if (amdgpu_sync_same_dev(adev, f) &&
 260                             fence_owner != owner)
 261                                 continue;
 262                         break;
 263
 264                 case AMDGPU_SYNC_EXPLICIT:
 265                         continue;
 266                 }
 267
 268                 WARN(debug_evictions && fence_owner == AMDGPU_FENCE_OWNER_KFD,
 269                      "Adding eviction fence to sync obj");
 270                 r = amdgpu_sync_fence(sync, f);
 271                 if (r)
 272                         break;
 273         }
 274         return r;
 275 }
 276
 277 /**
 278  * amdgpu_sync_peek_fence - get the next fence not signaled yet
 279  *
 280  * @sync: the sync object
 281  * @ring: optional ring to use for test
 282  *
 283  * Returns the next fence not signaled yet without removing it from the sync
 284  * object.
 285  */
 286 struct dma_fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync,
 287                                          struct amdgpu_ring *ring)
 288 {
 289         struct amdgpu_sync_entry *e;
 290         struct hlist_node *tmp;
 291         int i;
 292
 293         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 294                 struct dma_fence *f = e->fence;
 295                 struct drm_sched_fence *s_fence = to_drm_sched_fence(f);
 296
 297                 if (dma_fence_is_signaled(f)) {
 298                         hash_del(&e->node);
 299                         dma_fence_put(f);
 300                         kmem_cache_free(amdgpu_sync_slab, e);
 301                         continue;
 302                 }
 303                 if (ring && s_fence) {
 304                         /* For fences from the same ring it is sufficient
 305                          * when they are scheduled.
 306                          */
 307                         if (s_fence->sched == &ring->sched) {
 308                                 if (dma_fence_is_signaled(&s_fence->scheduled))
 309                                         continue;
 310
 311                                 return &s_fence->scheduled;
 312                         }
 313                 }
 314
 315                 return f;
 316         }
 317
 318         return NULL;
 319 }
 320
 321 /**
 322  * amdgpu_sync_get_fence - get the next fence from the sync object
 323  *
 324  * @sync: sync object to use
 325  *
 326  * Get and removes the next fence from the sync object not signaled yet.
 327  */
 328 struct dma_fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync)
 329 {
 330         struct amdgpu_sync_entry *e;
 331         struct hlist_node *tmp;
 332         struct dma_fence *f;
 333         int i;
 334         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 335
 336                 f = e->fence;
 337
 338                 hash_del(&e->node);
 339                 kmem_cache_free(amdgpu_sync_slab, e);
 340
 341                 if (!dma_fence_is_signaled(f))
 342                         return f;
 343
 344                 dma_fence_put(f);
 345         }
 346         return NULL;
 347 }
 348
 349 /**
 350  * amdgpu_sync_clone - clone a sync object
 351  *
 352  * @source: sync object to clone
 353  * @clone: pointer to destination sync object
 354  *
 355  * Adds references to all unsignaled fences in @source to @clone. Also
 356  * removes signaled fences from @source while at it.
 357  */
 358 int amdgpu_sync_clone(struct amdgpu_sync *source, struct amdgpu_sync *clone)
 359 {
 360         struct amdgpu_sync_entry *e;
 361         struct hlist_node *tmp;
 362         struct dma_fence *f;
 363         int i, r;
 364
 365         hash_for_each_safe(source->fences, i, tmp, e, node) {
 366                 f = e->fence;
 367                 if (!dma_fence_is_signaled(f)) {
 368                         r = amdgpu_sync_fence(clone, f);
 369                         if (r)
 370                                 return r;
 371                 } else {
 372                         hash_del(&e->node);
 373                         dma_fence_put(f);
 374                         kmem_cache_free(amdgpu_sync_slab, e);
 375                 }
 376         }
 377
 378         dma_fence_put(clone->last_vm_update);
 379         clone->last_vm_update = dma_fence_get(source->last_vm_update);
 380
 381         return 0;
 382 }
 383
 384 int amdgpu_sync_wait(struct amdgpu_sync *sync, bool intr)
 385 {
 386         struct amdgpu_sync_entry *e;
 387         struct hlist_node *tmp;
 388         int i, r;
 389
 390         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 391                 r = dma_fence_wait(e->fence, intr);
 392                 if (r)
 393                         return r;
 394
 395                 hash_del(&e->node);
 396                 dma_fence_put(e->fence);
 397                 kmem_cache_free(amdgpu_sync_slab, e);
 398         }
 399
 400         return 0;
 401 }
 402
 403 /**
 404  * amdgpu_sync_free - free the sync object
 405  *
 406  * @sync: sync object to use
 407  *
 408  * Free the sync object.
 409  */
 410 void amdgpu_sync_free(struct amdgpu_sync *sync)
 411 {
 412         struct amdgpu_sync_entry *e;
 413         struct hlist_node *tmp;
 414         unsigned i;
 415
 416         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 417                 hash_del(&e->node);
 418                 dma_fence_put(e->fence);
 419                 kmem_cache_free(amdgpu_sync_slab, e);
 420         }
 421
 422         dma_fence_put(sync->last_vm_update);
 423 }
 424
 425 /**
 426  * amdgpu_sync_init - init sync object subsystem
 427  *
 428  * Allocate the slab allocator.
 429  */
 430 int amdgpu_sync_init(void)
 431 {
 432         amdgpu_sync_slab = kmem_cache_create(
 433                 "amdgpu_sync", sizeof(struct amdgpu_sync_entry), 0,
 434                 SLAB_HWCACHE_ALIGN, NULL);
 435         if (!amdgpu_sync_slab)
 436                 return -ENOMEM;
 437
 438         return 0;
 439 }
 440
 441 /**
 442  * amdgpu_sync_fini - fini sync object subsystem
 443  *
 444  * Free the slab allocator.
 445  */
 446 void amdgpu_sync_fini(void)
 447 {
 448         kmem_cache_destroy(amdgpu_sync_slab);
 449 }