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 /**
  41  * amdgpu_sync_create - zero init sync object
  42  *
  43  * @sync: sync object to initialize
  44  *
  45  * Just clear the sync object for now.
  46  */
  47 void amdgpu_sync_create(struct amdgpu_sync *sync)
  48 {
  49         unsigned i;
  50
  51         for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
  52                 sync->semaphores[i] = NULL;
  53
  54         for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
  55                 sync->sync_to[i] = NULL;
  56
  57         hash_init(sync->fences);
  58         sync->last_vm_update = NULL;
  59 }
  60
  61 static bool amdgpu_sync_same_dev(struct amdgpu_device *adev, struct fence *f)
  62 {
  63         struct amdgpu_fence *a_fence = to_amdgpu_fence(f);
  64         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
  65
  66         if (a_fence)
  67                 return a_fence->ring->adev == adev;
  68         if (s_fence)
  69                 return (struct amdgpu_device *)s_fence->scheduler->priv == adev;
  70         return false;
  71 }
  72
  73 static bool amdgpu_sync_test_owner(struct fence *f, void *owner)
  74 {
  75         struct amdgpu_fence *a_fence = to_amdgpu_fence(f);
  76         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
  77         if (s_fence)
  78                 return s_fence->owner == owner;
  79         if (a_fence)
  80                 return a_fence->owner == owner;
  81         return false;
  82 }
  83
  84 /**
  85  * amdgpu_sync_fence - remember to sync to this fence
  86  *
  87  * @sync: sync object to add fence to
  88  * @fence: fence to sync to
  89  *
  90  */
  91 int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
  92                       struct fence *f)
  93 {
  94         struct amdgpu_sync_entry *e;
  95         struct amdgpu_fence *fence;
  96         struct amdgpu_fence *other;
  97         struct fence *tmp, *later;
  98
  99         if (!f)
 100                 return 0;
 101
 102         if (amdgpu_sync_same_dev(adev, f) &&
 103             amdgpu_sync_test_owner(f, AMDGPU_FENCE_OWNER_VM)) {
 104                 if (sync->last_vm_update) {
 105                         tmp = sync->last_vm_update;
 106                         BUG_ON(f->context != tmp->context);
 107                         later = (f->seqno - tmp->seqno <= INT_MAX) ? f : tmp;
 108                         sync->last_vm_update = fence_get(later);
 109                         fence_put(tmp);
 110                 } else
 111                         sync->last_vm_update = fence_get(f);
 112         }
 113
 114         fence = to_amdgpu_fence(f);
 115         if (!fence || fence->ring->adev != adev) {
 116                 hash_for_each_possible(sync->fences, e, node, f->context) {
 117                         struct fence *new;
 118                         if (unlikely(e->fence->context != f->context))
 119                                 continue;
 120                         new = fence_get(fence_later(e->fence, f));
 121                         if (new) {
 122                                 fence_put(e->fence);
 123                                 e->fence = new;
 124                         }
 125                         return 0;
 126                 }
 127
 128                 e = kmalloc(sizeof(struct amdgpu_sync_entry), GFP_KERNEL);
 129                 if (!e)
 130                         return -ENOMEM;
 131
 132                 hash_add(sync->fences, &e->node, f->context);
 133                 e->fence = fence_get(f);
 134                 return 0;
 135         }
 136
 137         other = sync->sync_to[fence->ring->idx];
 138         sync->sync_to[fence->ring->idx] = amdgpu_fence_ref(
 139                 amdgpu_fence_later(fence, other));
 140         amdgpu_fence_unref(&other);
 141
 142         return 0;
 143 }
 144
 145 static void *amdgpu_sync_get_owner(struct fence *f)
 146 {
 147         struct amdgpu_fence *a_fence = to_amdgpu_fence(f);
 148         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
 149
 150         if (s_fence)
 151                 return s_fence->owner;
 152         else if (a_fence)
 153                 return a_fence->owner;
 154         return AMDGPU_FENCE_OWNER_UNDEFINED;
 155 }
 156
 157 /**
 158  * amdgpu_sync_resv - use the semaphores to sync to a reservation object
 159  *
 160  * @sync: sync object to add fences from reservation object to
 161  * @resv: reservation object with embedded fence
 162  * @shared: true if we should only sync to the exclusive fence
 163  *
 164  * Sync to the fence using the semaphore objects
 165  */
 166 int amdgpu_sync_resv(struct amdgpu_device *adev,
 167                      struct amdgpu_sync *sync,
 168                      struct reservation_object *resv,
 169                      void *owner)
 170 {
 171         struct reservation_object_list *flist;
 172         struct fence *f;
 173         void *fence_owner;
 174         unsigned i;
 175         int r = 0;
 176
 177         if (resv == NULL)
 178                 return -EINVAL;
 179
 180         /* always sync to the exclusive fence */
 181         f = reservation_object_get_excl(resv);
 182         r = amdgpu_sync_fence(adev, sync, f);
 183
 184         flist = reservation_object_get_list(resv);
 185         if (!flist || r)
 186                 return r;
 187
 188         for (i = 0; i < flist->shared_count; ++i) {
 189                 f = rcu_dereference_protected(flist->shared[i],
 190                                               reservation_object_held(resv));
 191                 if (amdgpu_sync_same_dev(adev, f)) {
 192                         /* VM updates are only interesting
 193                          * for other VM updates and moves.
 194                          */
 195                         fence_owner = amdgpu_sync_get_owner(f);
 196                         if ((owner != AMDGPU_FENCE_OWNER_MOVE) &&
 197                             (fence_owner != AMDGPU_FENCE_OWNER_MOVE) &&
 198                             ((owner == AMDGPU_FENCE_OWNER_VM) !=
 199                              (fence_owner == AMDGPU_FENCE_OWNER_VM)))
 200                                 continue;
 201
 202                         /* Ignore fence from the same owner as
 203                          * long as it isn't undefined.
 204                          */
 205                         if (owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
 206                             fence_owner == owner)
 207                                 continue;
 208                 }
 209
 210                 r = amdgpu_sync_fence(adev, sync, f);
 211                 if (r)
 212                         break;
 213         }
 214         return r;
 215 }
 216
 217 struct fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync)
 218 {
 219         struct amdgpu_sync_entry *e;
 220         struct hlist_node *tmp;
 221         struct fence *f;
 222         int i;
 223
 224         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 225
 226                 f = e->fence;
 227
 228                 hash_del(&e->node);
 229                 kfree(e);
 230
 231                 if (!fence_is_signaled(f))
 232                         return f;
 233
 234                 fence_put(f);
 235         }
 236         return NULL;
 237 }
 238
 239 int amdgpu_sync_wait(struct amdgpu_sync *sync)
 240 {
 241         struct amdgpu_sync_entry *e;
 242         struct hlist_node *tmp;
 243         int i, r;
 244
 245         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 246                 r = fence_wait(e->fence, false);
 247                 if (r)
 248                         return r;
 249
 250                 hash_del(&e->node);
 251                 fence_put(e->fence);
 252                 kfree(e);
 253         }
 254         return 0;
 255 }
 256
 257 /**
 258  * amdgpu_sync_rings - sync ring to all registered fences
 259  *
 260  * @sync: sync object to use
 261  * @ring: ring that needs sync
 262  *
 263  * Ensure that all registered fences are signaled before letting
 264  * the ring continue. The caller must hold the ring lock.
 265  */
 266 int amdgpu_sync_rings(struct amdgpu_sync *sync,
 267                       struct amdgpu_ring *ring)
 268 {
 269         struct amdgpu_device *adev = ring->adev;
 270         unsigned count = 0;
 271         int i, r;
 272
 273         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 274                 struct amdgpu_fence *fence = sync->sync_to[i];
 275                 struct amdgpu_semaphore *semaphore;
 276                 struct amdgpu_ring *other = adev->rings[i];
 277
 278                 /* check if we really need to sync */
 279                 if (!amdgpu_fence_need_sync(fence, ring))
 280                         continue;
 281
 282                 /* prevent GPU deadlocks */
 283                 if (!other->ready) {
 284                         dev_err(adev->dev, "Syncing to a disabled ring!");
 285                         return -EINVAL;
 286                 }
 287
 288                 if (amdgpu_enable_scheduler || (count >= AMDGPU_NUM_SYNCS)) {
 289                         /* not enough room, wait manually */
 290                         r = fence_wait(&fence->base, false);
 291                         if (r)
 292                                 return r;
 293                         continue;
 294                 }
 295                 r = amdgpu_semaphore_create(adev, &semaphore);
 296                 if (r)
 297                         return r;
 298
 299                 sync->semaphores[count++] = semaphore;
 300
 301                 /* allocate enough space for sync command */
 302                 r = amdgpu_ring_alloc(other, 16);
 303                 if (r)
 304                         return r;
 305
 306                 /* emit the signal semaphore */
 307                 if (!amdgpu_semaphore_emit_signal(other, semaphore)) {
 308                         /* signaling wasn't successful wait manually */
 309                         amdgpu_ring_undo(other);
 310                         r = fence_wait(&fence->base, false);
 311                         if (r)
 312                                 return r;
 313                         continue;
 314                 }
 315
 316                 /* we assume caller has already allocated space on waiters ring */
 317                 if (!amdgpu_semaphore_emit_wait(ring, semaphore)) {
 318                         /* waiting wasn't successful wait manually */
 319                         amdgpu_ring_undo(other);
 320                         r = fence_wait(&fence->base, false);
 321                         if (r)
 322                                 return r;
 323                         continue;
 324                 }
 325
 326                 amdgpu_ring_commit(other);
 327                 amdgpu_fence_note_sync(fence, ring);
 328         }
 329
 330         return 0;
 331 }
 332
 333 /**
 334  * amdgpu_sync_free - free the sync object
 335  *
 336  * @adev: amdgpu_device pointer
 337  * @sync: sync object to use
 338  * @fence: fence to use for the free
 339  *
 340  * Free the sync object by freeing all semaphores in it.
 341  */
 342 void amdgpu_sync_free(struct amdgpu_device *adev,
 343                       struct amdgpu_sync *sync,
 344                       struct fence *fence)
 345 {
 346         struct amdgpu_sync_entry *e;
 347         struct hlist_node *tmp;
 348         unsigned i;
 349
 350         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 351                 hash_del(&e->node);
 352                 fence_put(e->fence);
 353                 kfree(e);
 354         }
 355
 356         for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
 357                 amdgpu_semaphore_free(adev, &sync->semaphores[i], fence);
 358
 359         for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
 360                 amdgpu_fence_unref(&sync->sync_to[i]);
 361
 362         fence_put(sync->last_vm_update);
 363 }