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, bool explicit)
 133 {
 134         struct amdgpu_sync_entry *e;
 135
 136         hash_for_each_possible(sync->fences, e, node, f->context) {
 137                 if (unlikely(e->fence->context != f->context))
 138                         continue;
 139
 140                 amdgpu_sync_keep_later(&e->fence, f);
 141
 142                 /* Preserve eplicit flag to not loose pipe line sync */
 143                 e->explicit |= explicit;
 144
 145                 return true;
 146         }
 147         return false;
 148 }
 149
 150 /**
 151  * amdgpu_sync_fence - remember to sync to this fence
 152  *
 153  * @sync: sync object to add fence to
 154  * @fence: fence to sync to
 155  *
 156  */
 157 int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 158                       struct dma_fence *f, bool explicit)
 159 {
 160         struct amdgpu_sync_entry *e;
 161
 162         if (!f)
 163                 return 0;
 164         if (amdgpu_sync_same_dev(adev, f) &&
 165             amdgpu_sync_get_owner(f) == AMDGPU_FENCE_OWNER_VM)
 166                 amdgpu_sync_keep_later(&sync->last_vm_update, f);
 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_resv - sync to a reservation object
 184  *
 185  * @sync: sync object to add fences from reservation object to
 186  * @resv: reservation object with embedded fence
 187  * @explicit_sync: true if we should only sync to the exclusive fence
 188  *
 189  * Sync to the fence
 190  */
 191 int amdgpu_sync_resv(struct amdgpu_device *adev,
 192                      struct amdgpu_sync *sync,
 193                      struct reservation_object *resv,
 194                      void *owner, bool explicit_sync)
 195 {
 196         struct reservation_object_list *flist;
 197         struct dma_fence *f;
 198         void *fence_owner;
 199         unsigned i;
 200         int r = 0;
 201
 202         if (resv == NULL)
 203                 return -EINVAL;
 204
 205         /* always sync to the exclusive fence */
 206         f = reservation_object_get_excl(resv);
 207         r = amdgpu_sync_fence(adev, sync, f, false);
 208
 209         flist = reservation_object_get_list(resv);
 210         if (!flist || r)
 211                 return r;
 212
 213         for (i = 0; i < flist->shared_count; ++i) {
 214                 f = rcu_dereference_protected(flist->shared[i],
 215                                               reservation_object_held(resv));
 216                 /* We only want to trigger KFD eviction fences on
 217                  * evict or move jobs. Skip KFD fences otherwise.
 218                  */
 219                 fence_owner = amdgpu_sync_get_owner(f);
 220                 if (fence_owner == AMDGPU_FENCE_OWNER_KFD &&
 221                     owner != AMDGPU_FENCE_OWNER_UNDEFINED)
 222                         continue;
 223
 224                 if (amdgpu_sync_same_dev(adev, f)) {
 225                         /* VM updates are only interesting
 226                          * for other VM updates and moves.
 227                          */
 228                         if ((owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 229                             (fence_owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 230                             ((owner == AMDGPU_FENCE_OWNER_VM) !=
 231                              (fence_owner == AMDGPU_FENCE_OWNER_VM)))
 232                                 continue;
 233
 234                         /* Ignore fence from the same owner and explicit one as
 235                          * long as it isn't undefined.
 236                          */
 237                         if (owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
 238                             (fence_owner == owner || explicit_sync))
 239                                 continue;
 240                 }
 241
 242                 r = amdgpu_sync_fence(adev, sync, f, false);
 243                 if (r)
 244                         break;
 245         }
 246         return r;
 247 }
 248
 249 /**
 250  * amdgpu_sync_peek_fence - get the next fence not signaled yet
 251  *
 252  * @sync: the sync object
 253  * @ring: optional ring to use for test
 254  *
 255  * Returns the next fence not signaled yet without removing it from the sync
 256  * object.
 257  */
 258 struct dma_fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync,
 259                                          struct amdgpu_ring *ring)
 260 {
 261         struct amdgpu_sync_entry *e;
 262         struct hlist_node *tmp;
 263         int i;
 264
 265         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 266                 struct dma_fence *f = e->fence;
 267                 struct drm_sched_fence *s_fence = to_drm_sched_fence(f);
 268
 269                 if (dma_fence_is_signaled(f)) {
 270                         hash_del(&e->node);
 271                         dma_fence_put(f);
 272                         kmem_cache_free(amdgpu_sync_slab, e);
 273                         continue;
 274                 }
 275                 if (ring && s_fence) {
 276                         /* For fences from the same ring it is sufficient
 277                          * when they are scheduled.
 278                          */
 279                         if (s_fence->sched == &ring->sched) {
 280                                 if (dma_fence_is_signaled(&s_fence->scheduled))
 281                                         continue;
 282
 283                                 return &s_fence->scheduled;
 284                         }
 285                 }
 286
 287                 return f;
 288         }
 289
 290         return NULL;
 291 }
 292
 293 /**
 294  * amdgpu_sync_get_fence - get the next fence from the sync object
 295  *
 296  * @sync: sync object to use
 297  * @explicit: true if the next fence is explicit
 298  *
 299  * Get and removes the next fence from the sync object not signaled yet.
 300  */
 301 struct dma_fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync, bool *explicit)
 302 {
 303         struct amdgpu_sync_entry *e;
 304         struct hlist_node *tmp;
 305         struct dma_fence *f;
 306         int i;
 307         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 308
 309                 f = e->fence;
 310                 if (explicit)
 311                         *explicit = e->explicit;
 312
 313                 hash_del(&e->node);
 314                 kmem_cache_free(amdgpu_sync_slab, e);
 315
 316                 if (!dma_fence_is_signaled(f))
 317                         return f;
 318
 319                 dma_fence_put(f);
 320         }
 321         return NULL;
 322 }
 323
 324 /**
 325  * amdgpu_sync_clone - clone a sync object
 326  *
 327  * @source: sync object to clone
 328  * @clone: pointer to destination sync object
 329  *
 330  * Adds references to all unsignaled fences in @source to @clone. Also
 331  * removes signaled fences from @source while at it.
 332  */
 333 int amdgpu_sync_clone(struct amdgpu_sync *source, struct amdgpu_sync *clone)
 334 {
 335         struct amdgpu_sync_entry *e;
 336         struct hlist_node *tmp;
 337         struct dma_fence *f;
 338         int i, r;
 339
 340         hash_for_each_safe(source->fences, i, tmp, e, node) {
 341                 f = e->fence;
 342                 if (!dma_fence_is_signaled(f)) {
 343                         r = amdgpu_sync_fence(NULL, clone, f, e->explicit);
 344                         if (r)
 345                                 return r;
 346                 } else {
 347                         hash_del(&e->node);
 348                         dma_fence_put(f);
 349                         kmem_cache_free(amdgpu_sync_slab, e);
 350                 }
 351         }
 352
 353         dma_fence_put(clone->last_vm_update);
 354         clone->last_vm_update = dma_fence_get(source->last_vm_update);
 355
 356         return 0;
 357 }
 358
 359 int amdgpu_sync_wait(struct amdgpu_sync *sync, bool intr)
 360 {
 361         struct amdgpu_sync_entry *e;
 362         struct hlist_node *tmp;
 363         int i, r;
 364
 365         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 366                 r = dma_fence_wait(e->fence, intr);
 367                 if (r)
 368                         return r;
 369
 370                 hash_del(&e->node);
 371                 dma_fence_put(e->fence);
 372                 kmem_cache_free(amdgpu_sync_slab, e);
 373         }
 374
 375         return 0;
 376 }
 377
 378 /**
 379  * amdgpu_sync_free - free the sync object
 380  *
 381  * @sync: sync object to use
 382  *
 383  * Free the sync object.
 384  */
 385 void amdgpu_sync_free(struct amdgpu_sync *sync)
 386 {
 387         struct amdgpu_sync_entry *e;
 388         struct hlist_node *tmp;
 389         unsigned i;
 390
 391         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 392                 hash_del(&e->node);
 393                 dma_fence_put(e->fence);
 394                 kmem_cache_free(amdgpu_sync_slab, e);
 395         }
 396
 397         dma_fence_put(sync->last_vm_update);
 398 }
 399
 400 /**
 401  * amdgpu_sync_init - init sync object subsystem
 402  *
 403  * Allocate the slab allocator.
 404  */
 405 int amdgpu_sync_init(void)
 406 {
 407         amdgpu_sync_slab = kmem_cache_create(
 408                 "amdgpu_sync", sizeof(struct amdgpu_sync_entry), 0,
 409                 SLAB_HWCACHE_ALIGN, NULL);
 410         if (!amdgpu_sync_slab)
 411                 return -ENOMEM;
 412
 413         return 0;
 414 }
 415
 416 /**
 417  * amdgpu_sync_fini - fini sync object subsystem
 418  *
 419  * Free the slab allocator.
 420  */
 421 void amdgpu_sync_fini(void)
 422 {
 423         kmem_cache_destroy(amdgpu_sync_slab);
 424 }