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 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, struct fence *f)
  64 {
  65         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
  66
  67         if (s_fence) {
  68                 struct amdgpu_ring *ring;
  69
  70                 ring = container_of(s_fence->sched, struct amdgpu_ring, sched);
  71                 return ring->adev == adev;
  72         }
  73
  74         return false;
  75 }
  76
  77 /**
  78  * amdgpu_sync_get_owner - extract the owner of a fence
  79  *
  80  * @fence: fence get the owner from
  81  *
  82  * Extract who originally created the fence.
  83  */
  84 static void *amdgpu_sync_get_owner(struct fence *f)
  85 {
  86         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
  87
  88         if (s_fence)
  89                 return s_fence->owner;
  90
  91         return AMDGPU_FENCE_OWNER_UNDEFINED;
  92 }
  93
  94 /**
  95  * amdgpu_sync_keep_later - Keep the later fence
  96  *
  97  * @keep: existing fence to test
  98  * @fence: new fence
  99  *
 100  * Either keep the existing fence or the new one, depending which one is later.
 101  */
 102 static void amdgpu_sync_keep_later(struct fence **keep, struct fence *fence)
 103 {
 104         if (*keep && fence_is_later(*keep, fence))
 105                 return;
 106
 107         fence_put(*keep);
 108         *keep = fence_get(fence);
 109 }
 110
 111 /**
 112  * amdgpu_sync_add_later - add the fence to the hash
 113  *
 114  * @sync: sync object to add the fence to
 115  * @f: fence to add
 116  *
 117  * Tries to add the fence to an existing hash entry. Returns true when an entry
 118  * was found, false otherwise.
 119  */
 120 static bool amdgpu_sync_add_later(struct amdgpu_sync *sync, struct fence *f)
 121 {
 122         struct amdgpu_sync_entry *e;
 123
 124         hash_for_each_possible(sync->fences, e, node, f->context) {
 125                 if (unlikely(e->fence->context != f->context))
 126                         continue;
 127
 128                 amdgpu_sync_keep_later(&e->fence, f);
 129                 return true;
 130         }
 131         return false;
 132 }
 133
 134 /**
 135  * amdgpu_sync_fence - remember to sync to this fence
 136  *
 137  * @sync: sync object to add fence to
 138  * @fence: fence to sync to
 139  *
 140  */
 141 int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 142                       struct fence *f)
 143 {
 144         struct amdgpu_sync_entry *e;
 145
 146         if (!f)
 147                 return 0;
 148
 149         if (amdgpu_sync_same_dev(adev, f) &&
 150             amdgpu_sync_get_owner(f) == AMDGPU_FENCE_OWNER_VM)
 151                 amdgpu_sync_keep_later(&sync->last_vm_update, f);
 152
 153         if (amdgpu_sync_add_later(sync, f))
 154                 return 0;
 155
 156         e = kmem_cache_alloc(amdgpu_sync_slab, GFP_KERNEL);
 157         if (!e)
 158                 return -ENOMEM;
 159
 160         hash_add(sync->fences, &e->node, f->context);
 161         e->fence = fence_get(f);
 162         return 0;
 163 }
 164
 165 /**
 166  * amdgpu_sync_resv - sync to a reservation object
 167  *
 168  * @sync: sync object to add fences from reservation object to
 169  * @resv: reservation object with embedded fence
 170  * @shared: true if we should only sync to the exclusive fence
 171  *
 172  * Sync to the fence
 173  */
 174 int amdgpu_sync_resv(struct amdgpu_device *adev,
 175                      struct amdgpu_sync *sync,
 176                      struct reservation_object *resv,
 177                      void *owner)
 178 {
 179         struct reservation_object_list *flist;
 180         struct fence *f;
 181         void *fence_owner;
 182         unsigned i;
 183         int r = 0;
 184
 185         if (resv == NULL)
 186                 return -EINVAL;
 187
 188         /* always sync to the exclusive fence */
 189         f = reservation_object_get_excl(resv);
 190         r = amdgpu_sync_fence(adev, sync, f);
 191
 192         flist = reservation_object_get_list(resv);
 193         if (!flist || r)
 194                 return r;
 195
 196         for (i = 0; i < flist->shared_count; ++i) {
 197                 f = rcu_dereference_protected(flist->shared[i],
 198                                               reservation_object_held(resv));
 199                 if (amdgpu_sync_same_dev(adev, f)) {
 200                         /* VM updates are only interesting
 201                          * for other VM updates and moves.
 202                          */
 203                         fence_owner = amdgpu_sync_get_owner(f);
 204                         if ((owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 205                             (fence_owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 206                             ((owner == AMDGPU_FENCE_OWNER_VM) !=
 207                              (fence_owner == AMDGPU_FENCE_OWNER_VM)))
 208                                 continue;
 209
 210                         /* Ignore fence from the same owner as
 211                          * long as it isn't undefined.
 212                          */
 213                         if (owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
 214                             fence_owner == owner)
 215                                 continue;
 216                 }
 217
 218                 r = amdgpu_sync_fence(adev, sync, f);
 219                 if (r)
 220                         break;
 221         }
 222         return r;
 223 }
 224
 225 /**
 226  * amdgpu_sync_peek_fence - get the next fence not signaled yet
 227  *
 228  * @sync: the sync object
 229  * @ring: optional ring to use for test
 230  *
 231  * Returns the next fence not signaled yet without removing it from the sync
 232  * object.
 233  */
 234 struct fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync,
 235                                      struct amdgpu_ring *ring)
 236 {
 237         struct amdgpu_sync_entry *e;
 238         struct hlist_node *tmp;
 239         int i;
 240
 241         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 242                 struct fence *f = e->fence;
 243                 struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
 244
 245                 if (ring && s_fence) {
 246                         /* For fences from the same ring it is sufficient
 247                          * when they are scheduled.
 248                          */
 249                         if (s_fence->sched == &ring->sched) {
 250                                 if (fence_is_signaled(&s_fence->scheduled))
 251                                         continue;
 252
 253                                 return &s_fence->scheduled;
 254                         }
 255                 }
 256
 257                 if (fence_is_signaled(f)) {
 258                         hash_del(&e->node);
 259                         fence_put(f);
 260                         kmem_cache_free(amdgpu_sync_slab, e);
 261                         continue;
 262                 }
 263
 264                 return f;
 265         }
 266
 267         return NULL;
 268 }
 269
 270 /**
 271  * amdgpu_sync_get_fence - get the next fence from the sync object
 272  *
 273  * @sync: sync object to use
 274  *
 275  * Get and removes the next fence from the sync object not signaled yet.
 276  */
 277 struct fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync)
 278 {
 279         struct amdgpu_sync_entry *e;
 280         struct hlist_node *tmp;
 281         struct fence *f;
 282         int i;
 283
 284         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 285
 286                 f = e->fence;
 287
 288                 hash_del(&e->node);
 289                 kmem_cache_free(amdgpu_sync_slab, e);
 290
 291                 if (!fence_is_signaled(f))
 292                         return f;
 293
 294                 fence_put(f);
 295         }
 296         return NULL;
 297 }
 298
 299 /**
 300  * amdgpu_sync_free - free the sync object
 301  *
 302  * @sync: sync object to use
 303  *
 304  * Free the sync object.
 305  */
 306 void amdgpu_sync_free(struct amdgpu_sync *sync)
 307 {
 308         struct amdgpu_sync_entry *e;
 309         struct hlist_node *tmp;
 310         unsigned i;
 311
 312         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 313                 hash_del(&e->node);
 314                 fence_put(e->fence);
 315                 kmem_cache_free(amdgpu_sync_slab, e);
 316         }
 317
 318         fence_put(sync->last_vm_update);
 319 }
 320
 321 /**
 322  * amdgpu_sync_init - init sync object subsystem
 323  *
 324  * Allocate the slab allocator.
 325  */
 326 int amdgpu_sync_init(void)
 327 {
 328         amdgpu_sync_slab = kmem_cache_create(
 329                 "amdgpu_sync", sizeof(struct amdgpu_sync_entry), 0,
 330                 SLAB_HWCACHE_ALIGN, NULL);
 331         if (!amdgpu_sync_slab)
 332                 return -ENOMEM;
 333
 334         return 0;
 335 }
 336
 337 /**
 338  * amdgpu_sync_fini - fini sync object subsystem
 339  *
 340  * Free the slab allocator.
 341  */
 342 void amdgpu_sync_fini(void)
 343 {
 344         kmem_cache_destroy(amdgpu_sync_slab);
 345 }