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_fence - remember to sync to this fence
 113  *
 114  * @sync: sync object to add fence to
 115  * @fence: fence to sync to
 116  *
 117  */
 118 int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 119                       struct fence *f)
 120 {
 121         struct amdgpu_sync_entry *e;
 122
 123         if (!f)
 124                 return 0;
 125
 126         if (amdgpu_sync_same_dev(adev, f) &&
 127             amdgpu_sync_get_owner(f) == AMDGPU_FENCE_OWNER_VM)
 128                 amdgpu_sync_keep_later(&sync->last_vm_update, f);
 129
 130         hash_for_each_possible(sync->fences, e, node, f->context) {
 131                 if (unlikely(e->fence->context != f->context))
 132                         continue;
 133
 134                 amdgpu_sync_keep_later(&e->fence, f);
 135                 return 0;
 136         }
 137
 138         e = kmem_cache_alloc(amdgpu_sync_slab, GFP_KERNEL);
 139         if (!e)
 140                 return -ENOMEM;
 141
 142         hash_add(sync->fences, &e->node, f->context);
 143         e->fence = fence_get(f);
 144         return 0;
 145 }
 146
 147 /**
 148  * amdgpu_sync_resv - sync to a reservation object
 149  *
 150  * @sync: sync object to add fences from reservation object to
 151  * @resv: reservation object with embedded fence
 152  * @shared: true if we should only sync to the exclusive fence
 153  *
 154  * Sync to the fence
 155  */
 156 int amdgpu_sync_resv(struct amdgpu_device *adev,
 157                      struct amdgpu_sync *sync,
 158                      struct reservation_object *resv,
 159                      void *owner)
 160 {
 161         struct reservation_object_list *flist;
 162         struct fence *f;
 163         void *fence_owner;
 164         unsigned i;
 165         int r = 0;
 166
 167         if (resv == NULL)
 168                 return -EINVAL;
 169
 170         /* always sync to the exclusive fence */
 171         f = reservation_object_get_excl(resv);
 172         r = amdgpu_sync_fence(adev, sync, f);
 173
 174         flist = reservation_object_get_list(resv);
 175         if (!flist || r)
 176                 return r;
 177
 178         for (i = 0; i < flist->shared_count; ++i) {
 179                 f = rcu_dereference_protected(flist->shared[i],
 180                                               reservation_object_held(resv));
 181                 if (amdgpu_sync_same_dev(adev, f)) {
 182                         /* VM updates are only interesting
 183                          * for other VM updates and moves.
 184                          */
 185                         fence_owner = amdgpu_sync_get_owner(f);
 186                         if ((owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 187                             (fence_owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
 188                             ((owner == AMDGPU_FENCE_OWNER_VM) !=
 189                              (fence_owner == AMDGPU_FENCE_OWNER_VM)))
 190                                 continue;
 191
 192                         /* Ignore fence from the same owner as
 193                          * long as it isn't undefined.
 194                          */
 195                         if (owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
 196                             fence_owner == owner)
 197                                 continue;
 198                 }
 199
 200                 r = amdgpu_sync_fence(adev, sync, f);
 201                 if (r)
 202                         break;
 203         }
 204         return r;
 205 }
 206
 207 struct fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync)
 208 {
 209         struct amdgpu_sync_entry *e;
 210         struct hlist_node *tmp;
 211         struct fence *f;
 212         int i;
 213
 214         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 215
 216                 f = e->fence;
 217
 218                 hash_del(&e->node);
 219                 kmem_cache_free(amdgpu_sync_slab, e);
 220
 221                 if (!fence_is_signaled(f))
 222                         return f;
 223
 224                 fence_put(f);
 225         }
 226         return NULL;
 227 }
 228
 229 int amdgpu_sync_wait(struct amdgpu_sync *sync)
 230 {
 231         struct amdgpu_sync_entry *e;
 232         struct hlist_node *tmp;
 233         int i, r;
 234
 235         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 236                 r = fence_wait(e->fence, false);
 237                 if (r)
 238                         return r;
 239
 240                 hash_del(&e->node);
 241                 fence_put(e->fence);
 242                 kmem_cache_free(amdgpu_sync_slab, e);
 243         }
 244
 245         return 0;
 246 }
 247
 248 /**
 249  * amdgpu_sync_free - free the sync object
 250  *
 251  * @sync: sync object to use
 252  *
 253  * Free the sync object.
 254  */
 255 void amdgpu_sync_free(struct amdgpu_sync *sync)
 256 {
 257         struct amdgpu_sync_entry *e;
 258         struct hlist_node *tmp;
 259         unsigned i;
 260
 261         hash_for_each_safe(sync->fences, i, tmp, e, node) {
 262                 hash_del(&e->node);
 263                 fence_put(e->fence);
 264                 kmem_cache_free(amdgpu_sync_slab, e);
 265         }
 266
 267         fence_put(sync->last_vm_update);
 268 }
 269
 270 /**
 271  * amdgpu_sync_init - init sync object subsystem
 272  *
 273  * Allocate the slab allocator.
 274  */
 275 int amdgpu_sync_init(void)
 276 {
 277         amdgpu_sync_slab = kmem_cache_create(
 278                 "amdgpu_sync", sizeof(struct amdgpu_sync_entry), 0,
 279                 SLAB_HWCACHE_ALIGN, NULL);
 280         if (!amdgpu_sync_slab)
 281                 return -ENOMEM;
 282
 283         return 0;
 284 }
 285
 286 /**
 287  * amdgpu_sync_fini - fini sync object subsystem
 288  *
 289  * Free the slab allocator.
 290  */
 291 void amdgpu_sync_fini(void)
 292 {
 293         kmem_cache_destroy(amdgpu_sync_slab);
 294 }