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 } 295