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 <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 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 amd_sched_fence *s_fence = to_amd_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 amd_sched_fence *s_fence = to_amd_sched_fence(f);
  88
  89         if (s_fence)
  90                 return s_fence->owner;
  91
  92         return AMDGPU_FENCE_OWNER_UNDEFINED;
  93 }
  94
  95 /**
  96  * amdgpu_sync_keep_later - Keep the later fence
  97  *
  98  * @keep: existing fence to test
  99  * @fence: new fence
 100  *
 101  * Either keep the existing fence or the new one, depending which one is later.
 102  */
 103 static void amdgpu_sync_keep_later(struct dma_fence **keep,
 104                                    struct dma_fence *fence)
 105 {
 106         if (*keep && dma_fence_is_later(*keep, fence))
 107                 return;
 108
 109         dma_fence_put(*keep);
 110         *keep = dma_fence_get(fence);
 111 }
 112
 113 /**
 114  * amdgpu_sync_add_later - add the fence to the hash
 115  *
 116  * @sync: sync object to add the fence to
 117  * @f: fence to add
 118  *
 119  * Tries to add the fence to an existing hash entry. Returns true when an entry
 120  * was found, false otherwise.
 121  */
 122 static bool amdgpu_sync_add_later(struct amdgpu_sync *sync, struct dma_fence *f)
 123 {
 124         struct amdgpu_sync_entry *e;
 125
 126         hash_for_each_possible(sync->fences, e, node, f->context) {
 127                 if (unlikely(e->fence->context != f->context))
 128                         continue;
 129
 130                 amdgpu_sync_keep_later(&e->fence, f);
 131                 return true;
 132         }
 133         return false;
 134 }
 135
 136 /**
 137  * amdgpu_sync_fence - remember to sync to this fence
 138  *
 139  * @sync: sync object to add fence to
 140  * @fence: fence to sync to
 141  *
 142  */
 143 int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 144                       struct dma_fence *f)
 145 {
 146         struct amdgpu_sync_entry *e;
 147
 148         if (!f)
 149                 return 0;
 150
 151         if (amdgpu_sync_same_dev(adev, f) &&
 152             amdgpu_sync_get_owner(f) == AMDGPU_FENCE_OWNER_VM)
 153                 amdgpu_sync_keep_later(&sync->last_vm_update, f);
 154
 155         if (amdgpu_sync_add_later(sync, f))
 156                 return 0;
 157
 158         e = kmem_cache_alloc(amdgpu_sync_slab, GFP_KERNEL);
 159         if (!e)
 160                 return -ENOMEM;
 161
 162         hash_add(sync->fences, &e->node, f->context);
 163         e->fence = dma_fence_get(f);
 164         return 0;
 165 }
 166
 167 /**
 168  * amdgpu_sync_resv - sync to a reservation object
 169  *
 170  * @sync: sync object to add fences from reservation object to
 171  * @resv: reservation object with embedded fence
 172  * @shared: true if we should only sync to the exclusive fence
 173  *
 174  * Sync to the fence
 175  */
 176 int amdgpu_sync_resv(struct amdgpu_device *adev,
 177                      struct amdgpu_sync *sync,
 178                      struct reservation_object *resv,
 179                      void *owner)
 180 {
 181         struct reservation_object_list *flist;
 182         struct dma_fence *f;
 183         void *fence_owner;
 184         unsigned i;
 185         int r = 0;
 186
 187         if (resv == NULL)
 188                 return -EINVAL;
 189
 190         /* always sync to the exclusive fence */
 191         f = reservation_object_get_excl(resv);
 192         r = amdgpu_sync_fence(adev, sync, f);
 193
 194         flist = reservation_object_get_list(resv);
 195         if (!flist || r)
 196                 return r;
 197
 198         for (i = 0; i < flist->shared_count; ++i) {
 199                 f = rcu_dereference_protected(flist->shared[i],
 200                                               reservation_object_held(resv));
 201                 if (amdgpu_sync_same_dev(adev, f)) {
 202                         /* VM updates are only interesting
 203                          * for other VM updates and moves.
 204                          */
 205                         fence_owner = amdgpu_sync_get_owner(f);
 206                         if ((owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 207                             (fence_owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 208                             ((owner == AMDGPU_FENCE_OWNER_VM) !=
 209                              (fence_owner == AMDGPU_FENCE_OWNER_VM)))
 210                                 continue;
 211
 212                         /* Ignore fence from the same owner as
 213                          * long as it isn't undefined.
 214                          */
 215                         if (owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
 216                             fence_owner == owner)
 217                                 continue;
 218                 }
 219
 220                 r = amdgpu_sync_fence(adev, sync, f);
 221                 if (r)
 222                         break;
 223         }
 224         return r;
 225 }
 226
 227 /**
 228  * amdgpu_sync_peek_fence - get the next fence not signaled yet
 229  *
 230  * @sync: the sync object
 231  * @ring: optional ring to use for test
 232  *
 233  * Returns the next fence not signaled yet without removing it from the sync
 234  * object.
 235  */
 236 struct dma_fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync,
 237                                          struct amdgpu_ring *ring)
 238 {
 239         struct amdgpu_sync_entry *e;
 240         struct hlist_node *tmp;
 241         int i;
 242
 243         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 244                 struct dma_fence *f = e->fence;
 245                 struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
 246
 247                 if (ring && s_fence) {
 248                         /* For fences from the same ring it is sufficient
 249                          * when they are scheduled.
 250                          */
 251                         if (s_fence->sched == &ring->sched) {
 252                                 if (dma_fence_is_signaled(&s_fence->scheduled))
 253                                         continue;
 254
 255                                 return &s_fence->scheduled;
 256                         }
 257                 }
 258
 259                 if (dma_fence_is_signaled(f)) {
 260                         hash_del(&e->node);
 261                         dma_fence_put(f);
 262                         kmem_cache_free(amdgpu_sync_slab, e);
 263                         continue;
 264                 }
 265
 266                 return f;
 267         }
 268
 269         return NULL;
 270 }
 271
 272 /**
 273  * amdgpu_sync_get_fence - get the next fence from the sync object
 274  *
 275  * @sync: sync object to use
 276  *
 277  * Get and removes the next fence from the sync object not signaled yet.
 278  */
 279 struct dma_fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync)
 280 {
 281         struct amdgpu_sync_entry *e;
 282         struct hlist_node *tmp;
 283         struct dma_fence *f;
 284         int i;
 285
 286         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 287
 288                 f = e->fence;
 289
 290                 hash_del(&e->node);
 291                 kmem_cache_free(amdgpu_sync_slab, e);
 292
 293                 if (!dma_fence_is_signaled(f))
 294                         return f;
 295
 296                 dma_fence_put(f);
 297         }
 298         return NULL;
 299 }
 300
 301 /**
 302  * amdgpu_sync_free - free the sync object
 303  *
 304  * @sync: sync object to use
 305  *
 306  * Free the sync object.
 307  */
 308 void amdgpu_sync_free(struct amdgpu_sync *sync)
 309 {
 310         struct amdgpu_sync_entry *e;
 311         struct hlist_node *tmp;
 312         unsigned i;
 313
 314         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 315                 hash_del(&e->node);
 316                 dma_fence_put(e->fence);
 317                 kmem_cache_free(amdgpu_sync_slab, e);
 318         }
 319
 320         dma_fence_put(sync->last_vm_update);
 321 }
 322
 323 /**
 324  * amdgpu_sync_init - init sync object subsystem
 325  *
 326  * Allocate the slab allocator.
 327  */
 328 int amdgpu_sync_init(void)
 329 {
 330         amdgpu_sync_slab = kmem_cache_create(
 331                 "amdgpu_sync", sizeof(struct amdgpu_sync_entry), 0,
 332                 SLAB_HWCACHE_ALIGN, NULL);
 333         if (!amdgpu_sync_slab)
 334                 return -ENOMEM;
 335
 336         return 0;
 337 }
 338
 339 /**
 340  * amdgpu_sync_fini - fini sync object subsystem
 341  *
 342  * Free the slab allocator.
 343  */
 344 void amdgpu_sync_fini(void)
 345 {
 346         kmem_cache_destroy(amdgpu_sync_slab);
 347 }