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 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         hash_init(sync->fences);
  50         sync->last_vm_update = NULL;
  51 }
  52
  53 static bool amdgpu_sync_same_dev(struct amdgpu_device *adev, struct fence *f)
  54 {
  55         struct amdgpu_fence *a_fence = to_amdgpu_fence(f);
  56         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
  57
  58         if (a_fence)
  59                 return a_fence->ring->adev == adev;
  60
  61         if (s_fence) {
  62                 struct amdgpu_ring *ring;
  63
  64                 ring = container_of(s_fence->sched, struct amdgpu_ring, sched);
  65                 return ring->adev == adev;
  66         }
  67
  68         return false;
  69 }
  70
  71 static bool amdgpu_sync_test_owner(struct fence *f, void *owner)
  72 {
  73         struct amdgpu_fence *a_fence = to_amdgpu_fence(f);
  74         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
  75         if (s_fence)
  76                 return s_fence->owner == owner;
  77         if (a_fence)
  78                 return a_fence->owner == owner;
  79         return false;
  80 }
  81
  82 static void amdgpu_sync_keep_later(struct fence **keep, struct fence *fence)
  83 {
  84         if (*keep && fence_is_later(*keep, fence))
  85                 return;
  86
  87         fence_put(*keep);
  88         *keep = fence_get(fence);
  89 }
  90
  91 /**
  92  * amdgpu_sync_fence - remember to sync to this fence
  93  *
  94  * @sync: sync object to add fence to
  95  * @fence: fence to sync to
  96  *
  97  */
  98 int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
  99                       struct fence *f)
 100 {
 101         struct amdgpu_sync_entry *e;
 102
 103         if (!f)
 104                 return 0;
 105
 106         if (amdgpu_sync_same_dev(adev, f) &&
 107             amdgpu_sync_test_owner(f, AMDGPU_FENCE_OWNER_VM))
 108                 amdgpu_sync_keep_later(&sync->last_vm_update, f);
 109
 110         hash_for_each_possible(sync->fences, e, node, f->context) {
 111                 if (unlikely(e->fence->context != f->context))
 112                         continue;
 113
 114                 amdgpu_sync_keep_later(&e->fence, f);
 115                 return 0;
 116         }
 117
 118         e = kmalloc(sizeof(struct amdgpu_sync_entry), GFP_KERNEL);
 119         if (!e)
 120                 return -ENOMEM;
 121
 122         hash_add(sync->fences, &e->node, f->context);
 123         e->fence = fence_get(f);
 124         return 0;
 125 }
 126
 127 static void *amdgpu_sync_get_owner(struct fence *f)
 128 {
 129         struct amdgpu_fence *a_fence = to_amdgpu_fence(f);
 130         struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
 131
 132         if (s_fence)
 133                 return s_fence->owner;
 134         else if (a_fence)
 135                 return a_fence->owner;
 136         return AMDGPU_FENCE_OWNER_UNDEFINED;
 137 }
 138
 139 /**
 140  * amdgpu_sync_resv - sync to a reservation object
 141  *
 142  * @sync: sync object to add fences from reservation object to
 143  * @resv: reservation object with embedded fence
 144  * @shared: true if we should only sync to the exclusive fence
 145  *
 146  * Sync to the fence
 147  */
 148 int amdgpu_sync_resv(struct amdgpu_device *adev,
 149                      struct amdgpu_sync *sync,
 150                      struct reservation_object *resv,
 151                      void *owner)
 152 {
 153         struct reservation_object_list *flist;
 154         struct fence *f;
 155         void *fence_owner;
 156         unsigned i;
 157         int r = 0;
 158
 159         if (resv == NULL)
 160                 return -EINVAL;
 161
 162         /* always sync to the exclusive fence */
 163         f = reservation_object_get_excl(resv);
 164         r = amdgpu_sync_fence(adev, sync, f);
 165
 166         flist = reservation_object_get_list(resv);
 167         if (!flist || r)
 168                 return r;
 169
 170         for (i = 0; i < flist->shared_count; ++i) {
 171                 f = rcu_dereference_protected(flist->shared[i],
 172                                               reservation_object_held(resv));
 173                 if (amdgpu_sync_same_dev(adev, f)) {
 174                         /* VM updates are only interesting
 175                          * for other VM updates and moves.
 176                          */
 177                         fence_owner = amdgpu_sync_get_owner(f);
 178                         if ((owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 179                             (fence_owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 180                             ((owner == AMDGPU_FENCE_OWNER_VM) !=
 181                              (fence_owner == AMDGPU_FENCE_OWNER_VM)))
 182                                 continue;
 183
 184                         /* Ignore fence from the same owner as
 185                          * long as it isn't undefined.
 186                          */
 187                         if (owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
 188                             fence_owner == owner)
 189                                 continue;
 190                 }
 191
 192                 r = amdgpu_sync_fence(adev, sync, f);
 193                 if (r)
 194                         break;
 195         }
 196         return r;
 197 }
 198
 199 struct fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync)
 200 {
 201         struct amdgpu_sync_entry *e;
 202         struct hlist_node *tmp;
 203         struct fence *f;
 204         int i;
 205
 206         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 207
 208                 f = e->fence;
 209
 210                 hash_del(&e->node);
 211                 kfree(e);
 212
 213                 if (!fence_is_signaled(f))
 214                         return f;
 215
 216                 fence_put(f);
 217         }
 218         return NULL;
 219 }
 220
 221 int amdgpu_sync_wait(struct amdgpu_sync *sync)
 222 {
 223         struct amdgpu_sync_entry *e;
 224         struct hlist_node *tmp;
 225         int i, r;
 226
 227         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 228                 r = fence_wait(e->fence, false);
 229                 if (r)
 230                         return r;
 231
 232                 hash_del(&e->node);
 233                 fence_put(e->fence);
 234                 kfree(e);
 235         }
 236
 237         return 0;
 238 }
 239
 240 /**
 241  * amdgpu_sync_free - free the sync object
 242  *
 243  * @sync: sync object to use
 244  *
 245  * Free the sync object.
 246  */
 247 void amdgpu_sync_free(struct amdgpu_sync *sync)
 248 {
 249         struct amdgpu_sync_entry *e;
 250         struct hlist_node *tmp;
 251         unsigned i;
 252
 253         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 254                 hash_del(&e->node);
 255                 fence_put(e->fence);
 256                 kfree(e);
 257         }
 258
 259         fence_put(sync->last_vm_update);
 260 }