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 /**
  36  * amdgpu_sync_create - zero init sync object
  37  *
  38  * @sync: sync object to initialize
  39  *
  40  * Just clear the sync object for now.
  41  */
  42 void amdgpu_sync_create(struct amdgpu_sync *sync)
  43 {
  44         unsigned i;
  45
  46         for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
  47                 sync->semaphores[i] = NULL;
  48
  49         for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
  50                 sync->sync_to[i] = NULL;
  51
  52         sync->last_vm_update = NULL;
  53 }
  54
  55 /**
  56  * amdgpu_sync_fence - remember to sync to this fence
  57  *
  58  * @sync: sync object to add fence to
  59  * @fence: fence to sync to
  60  *
  61  */
  62 int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
  63                       struct fence *f)
  64 {
  65         struct amdgpu_fence *fence;
  66         struct amdgpu_fence *other;
  67
  68         if (!f)
  69                 return 0;
  70
  71         fence = to_amdgpu_fence(f);
  72         if (!fence || fence->ring->adev != adev)
  73                 return fence_wait(f, true);
  74
  75         other = sync->sync_to[fence->ring->idx];
  76         sync->sync_to[fence->ring->idx] = amdgpu_fence_ref(
  77                 amdgpu_fence_later(fence, other));
  78         amdgpu_fence_unref(&other);
  79
  80         if (fence->owner == AMDGPU_FENCE_OWNER_VM) {
  81                 other = sync->last_vm_update;
  82                 sync->last_vm_update = amdgpu_fence_ref(
  83                         amdgpu_fence_later(fence, other));
  84                 amdgpu_fence_unref(&other);
  85         }
  86
  87         return 0;
  88 }
  89
  90 /**
  91  * amdgpu_sync_resv - use the semaphores to sync to a reservation object
  92  *
  93  * @sync: sync object to add fences from reservation object to
  94  * @resv: reservation object with embedded fence
  95  * @shared: true if we should only sync to the exclusive fence
  96  *
  97  * Sync to the fence using the semaphore objects
  98  */
  99 int amdgpu_sync_resv(struct amdgpu_device *adev,
 100                      struct amdgpu_sync *sync,
 101                      struct reservation_object *resv,
 102                      void *owner)
 103 {
 104         struct reservation_object_list *flist;
 105         struct fence *f;
 106         struct amdgpu_fence *fence;
 107         unsigned i;
 108         int r = 0;
 109
 110         if (resv == NULL)
 111                 return -EINVAL;
 112
 113         /* always sync to the exclusive fence */
 114         f = reservation_object_get_excl(resv);
 115         r = amdgpu_sync_fence(adev, sync, f);
 116
 117         flist = reservation_object_get_list(resv);
 118         if (!flist || r)
 119                 return r;
 120
 121         for (i = 0; i < flist->shared_count; ++i) {
 122                 f = rcu_dereference_protected(flist->shared[i],
 123                                               reservation_object_held(resv));
 124                 fence = f ? to_amdgpu_fence(f) : NULL;
 125                 if (fence && fence->ring->adev == adev &&
 126                     fence->owner == owner &&
 127                     fence->owner != AMDGPU_FENCE_OWNER_UNDEFINED)
 128                                 continue;
 129
 130                 r = amdgpu_sync_fence(adev, sync, f);
 131                 if (r)
 132                         break;
 133         }
 134         return r;
 135 }
 136
 137 /**
 138  * amdgpu_sync_rings - sync ring to all registered fences
 139  *
 140  * @sync: sync object to use
 141  * @ring: ring that needs sync
 142  *
 143  * Ensure that all registered fences are signaled before letting
 144  * the ring continue. The caller must hold the ring lock.
 145  */
 146 int amdgpu_sync_rings(struct amdgpu_sync *sync,
 147                       struct amdgpu_ring *ring)
 148 {
 149         struct amdgpu_device *adev = ring->adev;
 150         unsigned count = 0;
 151         int i, r;
 152
 153         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 154                 struct amdgpu_fence *fence = sync->sync_to[i];
 155                 struct amdgpu_semaphore *semaphore;
 156                 struct amdgpu_ring *other = adev->rings[i];
 157
 158                 /* check if we really need to sync */
 159                 if (!amdgpu_fence_need_sync(fence, ring))
 160                         continue;
 161
 162                 /* prevent GPU deadlocks */
 163                 if (!other->ready) {
 164                         dev_err(adev->dev, "Syncing to a disabled ring!");
 165                         return -EINVAL;
 166                 }
 167
 168                 if (amdgpu_enable_scheduler || (count >= AMDGPU_NUM_SYNCS)) {
 169                         /* not enough room, wait manually */
 170                         r = amdgpu_fence_wait(fence, false);
 171                         if (r)
 172                                 return r;
 173                         continue;
 174                 }
 175                 r = amdgpu_semaphore_create(adev, &semaphore);
 176                 if (r)
 177                         return r;
 178
 179                 sync->semaphores[count++] = semaphore;
 180
 181                 /* allocate enough space for sync command */
 182                 r = amdgpu_ring_alloc(other, 16);
 183                 if (r)
 184                         return r;
 185
 186                 /* emit the signal semaphore */
 187                 if (!amdgpu_semaphore_emit_signal(other, semaphore)) {
 188                         /* signaling wasn't successful wait manually */
 189                         amdgpu_ring_undo(other);
 190                         r = amdgpu_fence_wait(fence, false);
 191                         if (r)
 192                                 return r;
 193                         continue;
 194                 }
 195
 196                 /* we assume caller has already allocated space on waiters ring */
 197                 if (!amdgpu_semaphore_emit_wait(ring, semaphore)) {
 198                         /* waiting wasn't successful wait manually */
 199                         amdgpu_ring_undo(other);
 200                         r = amdgpu_fence_wait(fence, false);
 201                         if (r)
 202                                 return r;
 203                         continue;
 204                 }
 205
 206                 amdgpu_ring_commit(other);
 207                 amdgpu_fence_note_sync(fence, ring);
 208         }
 209
 210         return 0;
 211 }
 212
 213 /**
 214  * amdgpu_sync_free - free the sync object
 215  *
 216  * @adev: amdgpu_device pointer
 217  * @sync: sync object to use
 218  * @fence: fence to use for the free
 219  *
 220  * Free the sync object by freeing all semaphores in it.
 221  */
 222 void amdgpu_sync_free(struct amdgpu_device *adev,
 223                       struct amdgpu_sync *sync,
 224                       struct amdgpu_fence *fence)
 225 {
 226         unsigned i;
 227
 228         for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
 229                 amdgpu_semaphore_free(adev, &sync->semaphores[i], fence);
 230
 231         for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
 232                 amdgpu_fence_unref(&sync->sync_to[i]);
 233
 234         amdgpu_fence_unref(&sync->last_vm_update);
 235 }