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 owner != AMDGPU_FENCE_OWNER_KFD) 196 return false; 197 198 /* Ignore fences depending on the sync mode */ 199 switch (mode) { 200 case AMDGPU_SYNC_ALWAYS: 201 return true; 202 203 case AMDGPU_SYNC_NE_OWNER: 204 if (amdgpu_sync_same_dev(adev, f) && 205 fence_owner == owner) 206 return false; 207 break; 208 209 case AMDGPU_SYNC_EQ_OWNER: 210 if (amdgpu_sync_same_dev(adev, f) && 211 fence_owner != owner) 212 return false; 213 break; 214 215 case AMDGPU_SYNC_EXPLICIT: 216 return false; 217 } 218 219 WARN(debug_evictions && fence_owner == AMDGPU_FENCE_OWNER_KFD, 220 "Adding eviction fence to sync obj"); 221 return true; 222 } 223 224 /** 225 * amdgpu_sync_resv - sync to a reservation object 226 * 227 * @adev: amdgpu device 228 * @sync: sync object to add fences from reservation object to 229 * @resv: reservation object with embedded fence 230 * @mode: how owner affects which fences we sync to 231 * @owner: owner of the planned job submission 232 * 233 * Sync to the fence 234 */ 235 int amdgpu_sync_resv(struct amdgpu_device *adev, struct amdgpu_sync *sync, 236 struct dma_resv *resv, enum amdgpu_sync_mode mode, 237 void *owner) 238 { 239 struct dma_resv_iter cursor; 240 struct dma_fence *f; 241 int r; 242 243 if (resv == NULL) 244 return -EINVAL; 245 246 /* TODO: Use DMA_RESV_USAGE_READ here */ 247 dma_resv_for_each_fence(&cursor, resv, DMA_RESV_USAGE_BOOKKEEP, f) { 248 dma_fence_chain_for_each(f, f) { 249 struct dma_fence *tmp = dma_fence_chain_contained(f); 250 251 if (amdgpu_sync_test_fence(adev, mode, owner, tmp)) { 252 r = amdgpu_sync_fence(sync, f); 253 dma_fence_put(f); 254 if (r) 255 return r; 256 break; 257 } 258 } 259 } 260 return 0; 261 } 262 263 /* Free the entry back to the slab */ 264 static void amdgpu_sync_entry_free(struct amdgpu_sync_entry *e) 265 { 266 hash_del(&e->node); 267 dma_fence_put(e->fence); 268 kmem_cache_free(amdgpu_sync_slab, e); 269 } 270 271 /** 272 * amdgpu_sync_peek_fence - get the next fence not signaled yet 273 * 274 * @sync: the sync object 275 * @ring: optional ring to use for test 276 * 277 * Returns the next fence not signaled yet without removing it from the sync 278 * object. 279 */ 280 struct dma_fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync, 281 struct amdgpu_ring *ring) 282 { 283 struct amdgpu_sync_entry *e; 284 struct hlist_node *tmp; 285 int i; 286 287 hash_for_each_safe(sync->fences, i, tmp, e, node) { 288 struct dma_fence *f = e->fence; 289 struct drm_sched_fence *s_fence = to_drm_sched_fence(f); 290 291 if (dma_fence_is_signaled(f)) { 292 amdgpu_sync_entry_free(e); 293 continue; 294 } 295 if (ring && s_fence) { 296 /* For fences from the same ring it is sufficient 297 * when they are scheduled. 298 */ 299 if (s_fence->sched == &ring->sched) { 300 if (dma_fence_is_signaled(&s_fence->scheduled)) 301 continue; 302 303 return &s_fence->scheduled; 304 } 305 } 306 307 return f; 308 } 309 310 return NULL; 311 } 312 313 /** 314 * amdgpu_sync_get_fence - get the next fence from the sync object 315 * 316 * @sync: sync object to use 317 * 318 * Get and removes the next fence from the sync object not signaled yet. 319 */ 320 struct dma_fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync) 321 { 322 struct amdgpu_sync_entry *e; 323 struct hlist_node *tmp; 324 struct dma_fence *f; 325 int i; 326 327 hash_for_each_safe(sync->fences, i, tmp, e, node) { 328 329 f = e->fence; 330 331 hash_del(&e->node); 332 kmem_cache_free(amdgpu_sync_slab, e); 333 334 if (!dma_fence_is_signaled(f)) 335 return f; 336 337 dma_fence_put(f); 338 } 339 return NULL; 340 } 341 342 /** 343 * amdgpu_sync_clone - clone a sync object 344 * 345 * @source: sync object to clone 346 * @clone: pointer to destination sync object 347 * 348 * Adds references to all unsignaled fences in @source to @clone. Also 349 * removes signaled fences from @source while at it. 350 */ 351 int amdgpu_sync_clone(struct amdgpu_sync *source, struct amdgpu_sync *clone) 352 { 353 struct amdgpu_sync_entry *e; 354 struct hlist_node *tmp; 355 struct dma_fence *f; 356 int i, r; 357 358 hash_for_each_safe(source->fences, i, tmp, e, node) { 359 f = e->fence; 360 if (!dma_fence_is_signaled(f)) { 361 r = amdgpu_sync_fence(clone, f); 362 if (r) 363 return r; 364 } else { 365 amdgpu_sync_entry_free(e); 366 } 367 } 368 369 return 0; 370 } 371 372 /** 373 * amdgpu_sync_push_to_job - push fences into job 374 * @sync: sync object to get the fences from 375 * @job: job to push the fences into 376 * 377 * Add all unsignaled fences from sync to job. 378 */ 379 int amdgpu_sync_push_to_job(struct amdgpu_sync *sync, struct amdgpu_job *job) 380 { 381 struct amdgpu_sync_entry *e; 382 struct hlist_node *tmp; 383 struct dma_fence *f; 384 int i, r; 385 386 hash_for_each_safe(sync->fences, i, tmp, e, node) { 387 f = e->fence; 388 if (dma_fence_is_signaled(f)) { 389 amdgpu_sync_entry_free(e); 390 continue; 391 } 392 393 dma_fence_get(f); 394 r = drm_sched_job_add_dependency(&job->base, f); 395 if (r) { 396 dma_fence_put(f); 397 return r; 398 } 399 } 400 return 0; 401 } 402 403 int amdgpu_sync_wait(struct amdgpu_sync *sync, bool intr) 404 { 405 struct amdgpu_sync_entry *e; 406 struct hlist_node *tmp; 407 int i, r; 408 409 hash_for_each_safe(sync->fences, i, tmp, e, node) { 410 r = dma_fence_wait(e->fence, intr); 411 if (r) 412 return r; 413 414 amdgpu_sync_entry_free(e); 415 } 416 417 return 0; 418 } 419 420 /** 421 * amdgpu_sync_free - free the sync object 422 * 423 * @sync: sync object to use 424 * 425 * Free the sync object. 426 */ 427 void amdgpu_sync_free(struct amdgpu_sync *sync) 428 { 429 struct amdgpu_sync_entry *e; 430 struct hlist_node *tmp; 431 unsigned int i; 432 433 hash_for_each_safe(sync->fences, i, tmp, e, node) 434 amdgpu_sync_entry_free(e); 435 } 436 437 /** 438 * amdgpu_sync_init - init sync object subsystem 439 * 440 * Allocate the slab allocator. 441 */ 442 int amdgpu_sync_init(void) 443 { 444 amdgpu_sync_slab = KMEM_CACHE(amdgpu_sync_entry, SLAB_HWCACHE_ALIGN); 445 if (!amdgpu_sync_slab) 446 return -ENOMEM; 447 448 return 0; 449 } 450 451 /** 452 * amdgpu_sync_fini - fini sync object subsystem 453 * 454 * Free the slab allocator. 455 */ 456 void amdgpu_sync_fini(void) 457 { 458 kmem_cache_destroy(amdgpu_sync_slab); 459 } 460