1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright 2014 Advanced Micro Devices, Inc. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 18 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20 * USE OR OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * The above copyright notice and this permission notice (including the 23 * next paragraph) shall be included in all copies or substantial portions 24 * of the Software. 25 * 26 */ 27 /* 28 * Authors: 29 * Christian König <christian.koenig@amd.com> 30 */ 31 32 #include <linux/dma-fence-chain.h> 33 34 #include "amdgpu.h" 35 #include "amdgpu_trace.h" 36 #include "amdgpu_amdkfd.h" 37 38 struct amdgpu_sync_entry { 39 struct hlist_node node; 40 struct dma_fence *fence; 41 }; 42 43 static struct kmem_cache *amdgpu_sync_slab; 44 45 /** 46 * amdgpu_sync_create - zero init sync object 47 * 48 * @sync: sync object to initialize 49 * 50 * Just clear the sync object for now. 51 */ 52 void amdgpu_sync_create(struct amdgpu_sync *sync) 53 { 54 hash_init(sync->fences); 55 } 56 57 /** 58 * amdgpu_sync_same_dev - test if fence belong to us 59 * 60 * @adev: amdgpu device to use for the test 61 * @f: fence to test 62 * 63 * Test if the fence was issued by us. 64 */ 65 static bool amdgpu_sync_same_dev(struct amdgpu_device *adev, 66 struct dma_fence *f) 67 { 68 struct drm_sched_fence *s_fence = to_drm_sched_fence(f); 69 70 if (s_fence) { 71 struct amdgpu_ring *ring; 72 73 ring = container_of(s_fence->sched, struct amdgpu_ring, sched); 74 return ring->adev == adev; 75 } 76 77 return false; 78 } 79 80 /** 81 * amdgpu_sync_get_owner - extract the owner of a fence 82 * 83 * @f: fence get the owner from 84 * 85 * Extract who originally created the fence. 86 */ 87 static void *amdgpu_sync_get_owner(struct dma_fence *f) 88 { 89 struct drm_sched_fence *s_fence; 90 struct amdgpu_amdkfd_fence *kfd_fence; 91 92 if (!f) 93 return AMDGPU_FENCE_OWNER_UNDEFINED; 94 95 s_fence = to_drm_sched_fence(f); 96 if (s_fence) 97 return s_fence->owner; 98 99 kfd_fence = to_amdgpu_amdkfd_fence(f); 100 if (kfd_fence) 101 return AMDGPU_FENCE_OWNER_KFD; 102 103 return AMDGPU_FENCE_OWNER_UNDEFINED; 104 } 105 106 /** 107 * amdgpu_sync_keep_later - Keep the later fence 108 * 109 * @keep: existing fence to test 110 * @fence: new fence 111 * 112 * Either keep the existing fence or the new one, depending which one is later. 113 */ 114 static void amdgpu_sync_keep_later(struct dma_fence **keep, 115 struct dma_fence *fence) 116 { 117 if (*keep && dma_fence_is_later(*keep, fence)) 118 return; 119 120 dma_fence_put(*keep); 121 *keep = dma_fence_get(fence); 122 } 123 124 /** 125 * amdgpu_sync_add_later - add the fence to the hash 126 * 127 * @sync: sync object to add the fence to 128 * @f: fence to add 129 * 130 * Tries to add the fence to an existing hash entry. Returns true when an entry 131 * was found, false otherwise. 132 */ 133 static bool amdgpu_sync_add_later(struct amdgpu_sync *sync, struct dma_fence *f) 134 { 135 struct amdgpu_sync_entry *e; 136 137 hash_for_each_possible(sync->fences, e, node, f->context) { 138 if (unlikely(e->fence->context != f->context)) 139 continue; 140 141 amdgpu_sync_keep_later(&e->fence, f); 142 return true; 143 } 144 return false; 145 } 146 147 /** 148 * amdgpu_sync_fence - remember to sync to this fence 149 * 150 * @sync: sync object to add fence to 151 * @f: fence to sync to 152 * 153 * Add the fence to the sync object. 154 */ 155 int amdgpu_sync_fence(struct amdgpu_sync *sync, struct dma_fence *f) 156 { 157 struct amdgpu_sync_entry *e; 158 159 if (!f) 160 return 0; 161 162 if (amdgpu_sync_add_later(sync, f)) 163 return 0; 164 165 e = kmem_cache_alloc(amdgpu_sync_slab, GFP_KERNEL); 166 if (!e) 167 return -ENOMEM; 168 169 hash_add(sync->fences, &e->node, f->context); 170 e->fence = dma_fence_get(f); 171 return 0; 172 } 173 174 /* Determine based on the owner and mode if we should sync to a fence or not */ 175 static bool amdgpu_sync_test_fence(struct amdgpu_device *adev, 176 enum amdgpu_sync_mode mode, 177 void *owner, struct dma_fence *f) 178 { 179 void *fence_owner = amdgpu_sync_get_owner(f); 180 181 /* Always sync to moves, no matter what */ 182 if (fence_owner == AMDGPU_FENCE_OWNER_UNDEFINED) 183 return true; 184 185 /* We only want to trigger KFD eviction fences on 186 * evict or move jobs. Skip KFD fences otherwise. 187 */ 188 if (fence_owner == AMDGPU_FENCE_OWNER_KFD && 189 owner != AMDGPU_FENCE_OWNER_UNDEFINED) 190 return false; 191 192 /* Never sync to VM updates either. */ 193 if (fence_owner == AMDGPU_FENCE_OWNER_VM && 194 owner != AMDGPU_FENCE_OWNER_UNDEFINED) 195 return false; 196 197 /* Ignore fences depending on the sync mode */ 198 switch (mode) { 199 case AMDGPU_SYNC_ALWAYS: 200 return true; 201 202 case AMDGPU_SYNC_NE_OWNER: 203 if (amdgpu_sync_same_dev(adev, f) && 204 fence_owner == owner) 205 return false; 206 break; 207 208 case AMDGPU_SYNC_EQ_OWNER: 209 if (amdgpu_sync_same_dev(adev, f) && 210 fence_owner != owner) 211 return false; 212 break; 213 214 case AMDGPU_SYNC_EXPLICIT: 215 return false; 216 } 217 218 WARN(debug_evictions && fence_owner == AMDGPU_FENCE_OWNER_KFD, 219 "Adding eviction fence to sync obj"); 220 return true; 221 } 222 223 /** 224 * amdgpu_sync_resv - sync to a reservation object 225 * 226 * @adev: amdgpu device 227 * @sync: sync object to add fences from reservation object to 228 * @resv: reservation object with embedded fence 229 * @mode: how owner affects which fences we sync to 230 * @owner: owner of the planned job submission 231 * 232 * Sync to the fence 233 */ 234 int amdgpu_sync_resv(struct amdgpu_device *adev, struct amdgpu_sync *sync, 235 struct dma_resv *resv, enum amdgpu_sync_mode mode, 236 void *owner) 237 { 238 struct dma_resv_iter cursor; 239 struct dma_fence *f; 240 int r; 241 242 if (resv == NULL) 243 return -EINVAL; 244 245 /* TODO: Use DMA_RESV_USAGE_READ here */ 246 dma_resv_for_each_fence(&cursor, resv, DMA_RESV_USAGE_BOOKKEEP, f) { 247 dma_fence_chain_for_each(f, f) { 248 struct dma_fence *tmp = dma_fence_chain_contained(f); 249 250 if (amdgpu_sync_test_fence(adev, mode, owner, tmp)) { 251 r = amdgpu_sync_fence(sync, f); 252 dma_fence_put(f); 253 if (r) 254 return r; 255 break; 256 } 257 } 258 } 259 return 0; 260 } 261 262 /** 263 * amdgpu_sync_peek_fence - get the next fence not signaled yet 264 * 265 * @sync: the sync object 266 * @ring: optional ring to use for test 267 * 268 * Returns the next fence not signaled yet without removing it from the sync 269 * object. 270 */ 271 struct dma_fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync, 272 struct amdgpu_ring *ring) 273 { 274 struct amdgpu_sync_entry *e; 275 struct hlist_node *tmp; 276 int i; 277 278 hash_for_each_safe(sync->fences, i, tmp, e, node) { 279 struct dma_fence *f = e->fence; 280 struct drm_sched_fence *s_fence = to_drm_sched_fence(f); 281 282 if (dma_fence_is_signaled(f)) { 283 hash_del(&e->node); 284 dma_fence_put(f); 285 kmem_cache_free(amdgpu_sync_slab, e); 286 continue; 287 } 288 if (ring && s_fence) { 289 /* For fences from the same ring it is sufficient 290 * when they are scheduled. 291 */ 292 if (s_fence->sched == &ring->sched) { 293 if (dma_fence_is_signaled(&s_fence->scheduled)) 294 continue; 295 296 return &s_fence->scheduled; 297 } 298 } 299 300 return f; 301 } 302 303 return NULL; 304 } 305 306 /** 307 * amdgpu_sync_get_fence - get the next fence from the sync object 308 * 309 * @sync: sync object to use 310 * 311 * Get and removes the next fence from the sync object not signaled yet. 312 */ 313 struct dma_fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync) 314 { 315 struct amdgpu_sync_entry *e; 316 struct hlist_node *tmp; 317 struct dma_fence *f; 318 int i; 319 320 hash_for_each_safe(sync->fences, i, tmp, e, node) { 321 322 f = e->fence; 323 324 hash_del(&e->node); 325 kmem_cache_free(amdgpu_sync_slab, e); 326 327 if (!dma_fence_is_signaled(f)) 328 return f; 329 330 dma_fence_put(f); 331 } 332 return NULL; 333 } 334 335 /** 336 * amdgpu_sync_clone - clone a sync object 337 * 338 * @source: sync object to clone 339 * @clone: pointer to destination sync object 340 * 341 * Adds references to all unsignaled fences in @source to @clone. Also 342 * removes signaled fences from @source while at it. 343 */ 344 int amdgpu_sync_clone(struct amdgpu_sync *source, struct amdgpu_sync *clone) 345 { 346 struct amdgpu_sync_entry *e; 347 struct hlist_node *tmp; 348 struct dma_fence *f; 349 int i, r; 350 351 hash_for_each_safe(source->fences, i, tmp, e, node) { 352 f = e->fence; 353 if (!dma_fence_is_signaled(f)) { 354 r = amdgpu_sync_fence(clone, f); 355 if (r) 356 return r; 357 } else { 358 hash_del(&e->node); 359 dma_fence_put(f); 360 kmem_cache_free(amdgpu_sync_slab, e); 361 } 362 } 363 364 return 0; 365 } 366 367 int amdgpu_sync_wait(struct amdgpu_sync *sync, bool intr) 368 { 369 struct amdgpu_sync_entry *e; 370 struct hlist_node *tmp; 371 int i, r; 372 373 hash_for_each_safe(sync->fences, i, tmp, e, node) { 374 r = dma_fence_wait(e->fence, intr); 375 if (r) 376 return r; 377 378 hash_del(&e->node); 379 dma_fence_put(e->fence); 380 kmem_cache_free(amdgpu_sync_slab, e); 381 } 382 383 return 0; 384 } 385 386 /** 387 * amdgpu_sync_free - free the sync object 388 * 389 * @sync: sync object to use 390 * 391 * Free the sync object. 392 */ 393 void amdgpu_sync_free(struct amdgpu_sync *sync) 394 { 395 struct amdgpu_sync_entry *e; 396 struct hlist_node *tmp; 397 unsigned int i; 398 399 hash_for_each_safe(sync->fences, i, tmp, e, node) { 400 hash_del(&e->node); 401 dma_fence_put(e->fence); 402 kmem_cache_free(amdgpu_sync_slab, e); 403 } 404 } 405 406 /** 407 * amdgpu_sync_init - init sync object subsystem 408 * 409 * Allocate the slab allocator. 410 */ 411 int amdgpu_sync_init(void) 412 { 413 amdgpu_sync_slab = kmem_cache_create( 414 "amdgpu_sync", sizeof(struct amdgpu_sync_entry), 0, 415 SLAB_HWCACHE_ALIGN, NULL); 416 if (!amdgpu_sync_slab) 417 return -ENOMEM; 418 419 return 0; 420 } 421 422 /** 423 * amdgpu_sync_fini - fini sync object subsystem 424 * 425 * Free the slab allocator. 426 */ 427 void amdgpu_sync_fini(void) 428 { 429 kmem_cache_destroy(amdgpu_sync_slab); 430 } 431