1 /* 2 * Copyright 2016 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 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 NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Christian König 23 */ 24 #ifndef __AMDGPU_VM_H__ 25 #define __AMDGPU_VM_H__ 26 27 #include <linux/idr.h> 28 #include <linux/kfifo.h> 29 #include <linux/rbtree.h> 30 #include <drm/gpu_scheduler.h> 31 #include <drm/drm_file.h> 32 #include <drm/ttm/ttm_bo.h> 33 #include <linux/sched/mm.h> 34 35 #include "amdgpu_sync.h" 36 #include "amdgpu_ring.h" 37 #include "amdgpu_ids.h" 38 39 struct drm_exec; 40 41 struct amdgpu_bo_va; 42 struct amdgpu_job; 43 struct amdgpu_bo_list_entry; 44 struct amdgpu_bo_vm; 45 struct amdgpu_mem_stats; 46 47 /* 48 * GPUVM handling 49 */ 50 51 /* Maximum number of PTEs the hardware can write with one command */ 52 #define AMDGPU_VM_MAX_UPDATE_SIZE 0x3FFFF 53 54 /* number of entries in page table */ 55 #define AMDGPU_VM_PTE_COUNT(adev) (1 << (adev)->vm_manager.block_size) 56 57 #define AMDGPU_PTE_VALID (1ULL << 0) 58 #define AMDGPU_PTE_SYSTEM (1ULL << 1) 59 #define AMDGPU_PTE_SNOOPED (1ULL << 2) 60 61 /* RV+ */ 62 #define AMDGPU_PTE_TMZ (1ULL << 3) 63 64 /* VI only */ 65 #define AMDGPU_PTE_EXECUTABLE (1ULL << 4) 66 67 #define AMDGPU_PTE_READABLE (1ULL << 5) 68 #define AMDGPU_PTE_WRITEABLE (1ULL << 6) 69 70 #define AMDGPU_PTE_FRAG(x) ((x & 0x1fULL) << 7) 71 72 /* TILED for VEGA10, reserved for older ASICs */ 73 #define AMDGPU_PTE_PRT (1ULL << 51) 74 75 /* PDE is handled as PTE for VEGA10 */ 76 #define AMDGPU_PDE_PTE (1ULL << 54) 77 78 #define AMDGPU_PTE_LOG (1ULL << 55) 79 80 /* PTE is handled as PDE for VEGA10 (Translate Further) */ 81 #define AMDGPU_PTE_TF (1ULL << 56) 82 83 /* MALL noalloc for sienna_cichlid, reserved for older ASICs */ 84 #define AMDGPU_PTE_NOALLOC (1ULL << 58) 85 86 /* PDE Block Fragment Size for VEGA10 */ 87 #define AMDGPU_PDE_BFS(a) ((uint64_t)a << 59) 88 89 /* Flag combination to set no-retry with TF disabled */ 90 #define AMDGPU_VM_NORETRY_FLAGS (AMDGPU_PTE_EXECUTABLE | AMDGPU_PDE_PTE | \ 91 AMDGPU_PTE_TF) 92 93 /* Flag combination to set no-retry with TF enabled */ 94 #define AMDGPU_VM_NORETRY_FLAGS_TF (AMDGPU_PTE_VALID | AMDGPU_PTE_SYSTEM | \ 95 AMDGPU_PTE_PRT) 96 /* For GFX9 */ 97 #define AMDGPU_PTE_MTYPE_VG10(a) ((uint64_t)(a) << 57) 98 #define AMDGPU_PTE_MTYPE_VG10_MASK AMDGPU_PTE_MTYPE_VG10(3ULL) 99 100 #define AMDGPU_MTYPE_NC 0 101 #define AMDGPU_MTYPE_CC 2 102 103 #define AMDGPU_PTE_DEFAULT_ATC (AMDGPU_PTE_SYSTEM \ 104 | AMDGPU_PTE_SNOOPED \ 105 | AMDGPU_PTE_EXECUTABLE \ 106 | AMDGPU_PTE_READABLE \ 107 | AMDGPU_PTE_WRITEABLE \ 108 | AMDGPU_PTE_MTYPE_VG10(AMDGPU_MTYPE_CC)) 109 110 /* gfx10 */ 111 #define AMDGPU_PTE_MTYPE_NV10(a) ((uint64_t)(a) << 48) 112 #define AMDGPU_PTE_MTYPE_NV10_MASK AMDGPU_PTE_MTYPE_NV10(7ULL) 113 114 /* How to program VM fault handling */ 115 #define AMDGPU_VM_FAULT_STOP_NEVER 0 116 #define AMDGPU_VM_FAULT_STOP_FIRST 1 117 #define AMDGPU_VM_FAULT_STOP_ALWAYS 2 118 119 /* Reserve 4MB VRAM for page tables */ 120 #define AMDGPU_VM_RESERVED_VRAM (8ULL << 20) 121 122 /* 123 * max number of VMHUB 124 * layout: max 8 GFXHUB + 4 MMHUB0 + 1 MMHUB1 125 */ 126 #define AMDGPU_MAX_VMHUBS 13 127 #define AMDGPU_GFXHUB(x) (x) 128 #define AMDGPU_MMHUB0(x) (8 + x) 129 #define AMDGPU_MMHUB1(x) (8 + 4 + x) 130 131 /* Reserve 2MB at top/bottom of address space for kernel use */ 132 #define AMDGPU_VA_RESERVED_SIZE (2ULL << 20) 133 134 /* See vm_update_mode */ 135 #define AMDGPU_VM_USE_CPU_FOR_GFX (1 << 0) 136 #define AMDGPU_VM_USE_CPU_FOR_COMPUTE (1 << 1) 137 138 /* VMPT level enumerate, and the hiberachy is: 139 * PDB2->PDB1->PDB0->PTB 140 */ 141 enum amdgpu_vm_level { 142 AMDGPU_VM_PDB2, 143 AMDGPU_VM_PDB1, 144 AMDGPU_VM_PDB0, 145 AMDGPU_VM_PTB 146 }; 147 148 /* base structure for tracking BO usage in a VM */ 149 struct amdgpu_vm_bo_base { 150 /* constant after initialization */ 151 struct amdgpu_vm *vm; 152 struct amdgpu_bo *bo; 153 154 /* protected by bo being reserved */ 155 struct amdgpu_vm_bo_base *next; 156 157 /* protected by spinlock */ 158 struct list_head vm_status; 159 160 /* protected by the BO being reserved */ 161 bool moved; 162 }; 163 164 /* provided by hw blocks that can write ptes, e.g., sdma */ 165 struct amdgpu_vm_pte_funcs { 166 /* number of dw to reserve per operation */ 167 unsigned copy_pte_num_dw; 168 169 /* copy pte entries from GART */ 170 void (*copy_pte)(struct amdgpu_ib *ib, 171 uint64_t pe, uint64_t src, 172 unsigned count); 173 174 /* write pte one entry at a time with addr mapping */ 175 void (*write_pte)(struct amdgpu_ib *ib, uint64_t pe, 176 uint64_t value, unsigned count, 177 uint32_t incr); 178 /* for linear pte/pde updates without addr mapping */ 179 void (*set_pte_pde)(struct amdgpu_ib *ib, 180 uint64_t pe, 181 uint64_t addr, unsigned count, 182 uint32_t incr, uint64_t flags); 183 }; 184 185 struct amdgpu_task_info { 186 char process_name[TASK_COMM_LEN]; 187 char task_name[TASK_COMM_LEN]; 188 pid_t pid; 189 pid_t tgid; 190 }; 191 192 /** 193 * struct amdgpu_vm_update_params 194 * 195 * Encapsulate some VM table update parameters to reduce 196 * the number of function parameters 197 * 198 */ 199 struct amdgpu_vm_update_params { 200 201 /** 202 * @adev: amdgpu device we do this update for 203 */ 204 struct amdgpu_device *adev; 205 206 /** 207 * @vm: optional amdgpu_vm we do this update for 208 */ 209 struct amdgpu_vm *vm; 210 211 /** 212 * @immediate: if changes should be made immediately 213 */ 214 bool immediate; 215 216 /** 217 * @unlocked: true if the root BO is not locked 218 */ 219 bool unlocked; 220 221 /** 222 * @pages_addr: 223 * 224 * DMA addresses to use for mapping 225 */ 226 dma_addr_t *pages_addr; 227 228 /** 229 * @job: job to used for hw submission 230 */ 231 struct amdgpu_job *job; 232 233 /** 234 * @num_dw_left: number of dw left for the IB 235 */ 236 unsigned int num_dw_left; 237 238 /** 239 * @table_freed: return true if page table is freed when updating 240 */ 241 bool table_freed; 242 }; 243 244 struct amdgpu_vm_update_funcs { 245 int (*map_table)(struct amdgpu_bo_vm *bo); 246 int (*prepare)(struct amdgpu_vm_update_params *p, struct dma_resv *resv, 247 enum amdgpu_sync_mode sync_mode); 248 int (*update)(struct amdgpu_vm_update_params *p, 249 struct amdgpu_bo_vm *bo, uint64_t pe, uint64_t addr, 250 unsigned count, uint32_t incr, uint64_t flags); 251 int (*commit)(struct amdgpu_vm_update_params *p, 252 struct dma_fence **fence); 253 }; 254 255 struct amdgpu_vm_fault { 256 SIMPLEQ_ENTRY(amdgpu_vm_fault) vm_fault_entry; 257 uint64_t val; 258 }; 259 SIMPLEQ_HEAD(amdgpu_vm_faults, amdgpu_vm_fault); 260 261 struct amdgpu_vm { 262 /* tree of virtual addresses mapped */ 263 struct rb_root_cached va; 264 265 /* Lock to prevent eviction while we are updating page tables 266 * use vm_eviction_lock/unlock(vm) 267 */ 268 struct rwlock eviction_lock; 269 bool evicting; 270 unsigned int saved_flags; 271 272 /* Lock to protect vm_bo add/del/move on all lists of vm */ 273 spinlock_t status_lock; 274 275 /* BOs who needs a validation */ 276 struct list_head evicted; 277 278 /* PT BOs which relocated and their parent need an update */ 279 struct list_head relocated; 280 281 /* per VM BOs moved, but not yet updated in the PT */ 282 struct list_head moved; 283 284 /* All BOs of this VM not currently in the state machine */ 285 struct list_head idle; 286 287 /* regular invalidated BOs, but not yet updated in the PT */ 288 struct list_head invalidated; 289 290 /* BO mappings freed, but not yet updated in the PT */ 291 struct list_head freed; 292 293 /* BOs which are invalidated, has been updated in the PTs */ 294 struct list_head done; 295 296 /* PT BOs scheduled to free and fill with zero if vm_resv is not hold */ 297 struct list_head pt_freed; 298 struct work_struct pt_free_work; 299 300 /* contains the page directory */ 301 struct amdgpu_vm_bo_base root; 302 struct dma_fence *last_update; 303 304 /* Scheduler entities for page table updates */ 305 struct drm_sched_entity immediate; 306 struct drm_sched_entity delayed; 307 308 /* Last finished delayed update */ 309 atomic64_t tlb_seq; 310 struct dma_fence *last_tlb_flush; 311 312 /* How many times we had to re-generate the page tables */ 313 uint64_t generation; 314 315 /* Last unlocked submission to the scheduler entities */ 316 struct dma_fence *last_unlocked; 317 318 unsigned int pasid; 319 bool reserved_vmid[AMDGPU_MAX_VMHUBS]; 320 321 /* Flag to indicate if VM tables are updated by CPU or GPU (SDMA) */ 322 bool use_cpu_for_update; 323 324 /* Functions to use for VM table updates */ 325 const struct amdgpu_vm_update_funcs *update_funcs; 326 327 /* Flag to indicate ATS support from PTE for GFX9 */ 328 bool pte_support_ats; 329 330 #ifdef __linux__ 331 /* Up to 128 pending retry page faults */ 332 DECLARE_KFIFO(faults, u64, 128); 333 #else 334 struct amdgpu_vm_faults faults; 335 #endif 336 337 /* Points to the KFD process VM info */ 338 struct amdkfd_process_info *process_info; 339 340 /* List node in amdkfd_process_info.vm_list_head */ 341 struct list_head vm_list_node; 342 343 /* Valid while the PD is reserved or fenced */ 344 uint64_t pd_phys_addr; 345 346 /* Some basic info about the task */ 347 struct amdgpu_task_info task_info; 348 349 /* Store positions of group of BOs */ 350 struct ttm_lru_bulk_move lru_bulk_move; 351 /* Flag to indicate if VM is used for compute */ 352 bool is_compute_context; 353 354 /* Memory partition number, -1 means any partition */ 355 int8_t mem_id; 356 }; 357 358 struct amdgpu_vm_manager { 359 /* Handling of VMIDs */ 360 struct amdgpu_vmid_mgr id_mgr[AMDGPU_MAX_VMHUBS]; 361 unsigned int first_kfd_vmid; 362 bool concurrent_flush; 363 364 /* Handling of VM fences */ 365 u64 fence_context; 366 unsigned seqno[AMDGPU_MAX_RINGS]; 367 368 uint64_t max_pfn; 369 uint32_t num_level; 370 uint32_t block_size; 371 uint32_t fragment_size; 372 enum amdgpu_vm_level root_level; 373 /* vram base address for page table entry */ 374 u64 vram_base_offset; 375 /* vm pte handling */ 376 const struct amdgpu_vm_pte_funcs *vm_pte_funcs; 377 struct drm_gpu_scheduler *vm_pte_scheds[AMDGPU_MAX_RINGS]; 378 unsigned vm_pte_num_scheds; 379 struct amdgpu_ring *page_fault; 380 381 /* partial resident texture handling */ 382 spinlock_t prt_lock; 383 atomic_t num_prt_users; 384 385 /* controls how VM page tables are updated for Graphics and Compute. 386 * BIT0[= 0] Graphics updated by SDMA [= 1] by CPU 387 * BIT1[= 0] Compute updated by SDMA [= 1] by CPU 388 */ 389 int vm_update_mode; 390 391 /* PASID to VM mapping, will be used in interrupt context to 392 * look up VM of a page fault 393 */ 394 struct xarray pasids; 395 }; 396 397 struct amdgpu_bo_va_mapping; 398 399 #define amdgpu_vm_copy_pte(adev, ib, pe, src, count) ((adev)->vm_manager.vm_pte_funcs->copy_pte((ib), (pe), (src), (count))) 400 #define amdgpu_vm_write_pte(adev, ib, pe, value, count, incr) ((adev)->vm_manager.vm_pte_funcs->write_pte((ib), (pe), (value), (count), (incr))) 401 #define amdgpu_vm_set_pte_pde(adev, ib, pe, addr, count, incr, flags) ((adev)->vm_manager.vm_pte_funcs->set_pte_pde((ib), (pe), (addr), (count), (incr), (flags))) 402 403 extern const struct amdgpu_vm_update_funcs amdgpu_vm_cpu_funcs; 404 extern const struct amdgpu_vm_update_funcs amdgpu_vm_sdma_funcs; 405 406 void amdgpu_vm_manager_init(struct amdgpu_device *adev); 407 void amdgpu_vm_manager_fini(struct amdgpu_device *adev); 408 409 int amdgpu_vm_set_pasid(struct amdgpu_device *adev, struct amdgpu_vm *vm, 410 u32 pasid); 411 412 long amdgpu_vm_wait_idle(struct amdgpu_vm *vm, long timeout); 413 int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm, int32_t xcp_id); 414 int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm); 415 void amdgpu_vm_release_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm); 416 void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm); 417 int amdgpu_vm_lock_pd(struct amdgpu_vm *vm, struct drm_exec *exec, 418 unsigned int num_fences); 419 bool amdgpu_vm_ready(struct amdgpu_vm *vm); 420 uint64_t amdgpu_vm_generation(struct amdgpu_device *adev, struct amdgpu_vm *vm); 421 int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm, 422 int (*callback)(void *p, struct amdgpu_bo *bo), 423 void *param); 424 int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job, bool need_pipe_sync); 425 int amdgpu_vm_update_pdes(struct amdgpu_device *adev, 426 struct amdgpu_vm *vm, bool immediate); 427 int amdgpu_vm_clear_freed(struct amdgpu_device *adev, 428 struct amdgpu_vm *vm, 429 struct dma_fence **fence); 430 int amdgpu_vm_handle_moved(struct amdgpu_device *adev, 431 struct amdgpu_vm *vm); 432 void amdgpu_vm_bo_base_init(struct amdgpu_vm_bo_base *base, 433 struct amdgpu_vm *vm, struct amdgpu_bo *bo); 434 int amdgpu_vm_update_range(struct amdgpu_device *adev, struct amdgpu_vm *vm, 435 bool immediate, bool unlocked, bool flush_tlb, 436 struct dma_resv *resv, uint64_t start, uint64_t last, 437 uint64_t flags, uint64_t offset, uint64_t vram_base, 438 struct ttm_resource *res, dma_addr_t *pages_addr, 439 struct dma_fence **fence); 440 int amdgpu_vm_bo_update(struct amdgpu_device *adev, 441 struct amdgpu_bo_va *bo_va, 442 bool clear); 443 bool amdgpu_vm_evictable(struct amdgpu_bo *bo); 444 void amdgpu_vm_bo_invalidate(struct amdgpu_device *adev, 445 struct amdgpu_bo *bo, bool evicted); 446 uint64_t amdgpu_vm_map_gart(const dma_addr_t *pages_addr, uint64_t addr); 447 struct amdgpu_bo_va *amdgpu_vm_bo_find(struct amdgpu_vm *vm, 448 struct amdgpu_bo *bo); 449 struct amdgpu_bo_va *amdgpu_vm_bo_add(struct amdgpu_device *adev, 450 struct amdgpu_vm *vm, 451 struct amdgpu_bo *bo); 452 int amdgpu_vm_bo_map(struct amdgpu_device *adev, 453 struct amdgpu_bo_va *bo_va, 454 uint64_t addr, uint64_t offset, 455 uint64_t size, uint64_t flags); 456 int amdgpu_vm_bo_replace_map(struct amdgpu_device *adev, 457 struct amdgpu_bo_va *bo_va, 458 uint64_t addr, uint64_t offset, 459 uint64_t size, uint64_t flags); 460 int amdgpu_vm_bo_unmap(struct amdgpu_device *adev, 461 struct amdgpu_bo_va *bo_va, 462 uint64_t addr); 463 int amdgpu_vm_bo_clear_mappings(struct amdgpu_device *adev, 464 struct amdgpu_vm *vm, 465 uint64_t saddr, uint64_t size); 466 struct amdgpu_bo_va_mapping *amdgpu_vm_bo_lookup_mapping(struct amdgpu_vm *vm, 467 uint64_t addr); 468 void amdgpu_vm_bo_trace_cs(struct amdgpu_vm *vm, struct ww_acquire_ctx *ticket); 469 void amdgpu_vm_bo_del(struct amdgpu_device *adev, 470 struct amdgpu_bo_va *bo_va); 471 void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint32_t min_vm_size, 472 uint32_t fragment_size_default, unsigned max_level, 473 unsigned max_bits); 474 int amdgpu_vm_ioctl(struct drm_device *dev, void *data, struct drm_file *filp); 475 bool amdgpu_vm_need_pipeline_sync(struct amdgpu_ring *ring, 476 struct amdgpu_job *job); 477 void amdgpu_vm_check_compute_bug(struct amdgpu_device *adev); 478 479 void amdgpu_vm_get_task_info(struct amdgpu_device *adev, u32 pasid, 480 struct amdgpu_task_info *task_info); 481 bool amdgpu_vm_handle_fault(struct amdgpu_device *adev, u32 pasid, 482 u32 vmid, u32 node_id, uint64_t addr, 483 bool write_fault); 484 485 void amdgpu_vm_set_task_info(struct amdgpu_vm *vm); 486 487 void amdgpu_vm_move_to_lru_tail(struct amdgpu_device *adev, 488 struct amdgpu_vm *vm); 489 void amdgpu_vm_get_memory(struct amdgpu_vm *vm, 490 struct amdgpu_mem_stats *stats); 491 492 int amdgpu_vm_pt_clear(struct amdgpu_device *adev, struct amdgpu_vm *vm, 493 struct amdgpu_bo_vm *vmbo, bool immediate); 494 int amdgpu_vm_pt_create(struct amdgpu_device *adev, struct amdgpu_vm *vm, 495 int level, bool immediate, struct amdgpu_bo_vm **vmbo, 496 int32_t xcp_id); 497 void amdgpu_vm_pt_free_root(struct amdgpu_device *adev, struct amdgpu_vm *vm); 498 bool amdgpu_vm_pt_is_root_clean(struct amdgpu_device *adev, 499 struct amdgpu_vm *vm); 500 501 int amdgpu_vm_pde_update(struct amdgpu_vm_update_params *params, 502 struct amdgpu_vm_bo_base *entry); 503 int amdgpu_vm_ptes_update(struct amdgpu_vm_update_params *params, 504 uint64_t start, uint64_t end, 505 uint64_t dst, uint64_t flags); 506 void amdgpu_vm_pt_free_work(struct work_struct *work); 507 508 #if defined(CONFIG_DEBUG_FS) 509 void amdgpu_debugfs_vm_bo_info(struct amdgpu_vm *vm, struct seq_file *m); 510 #endif 511 512 int amdgpu_vm_pt_map_tables(struct amdgpu_device *adev, struct amdgpu_vm *vm); 513 514 /** 515 * amdgpu_vm_tlb_seq - return tlb flush sequence number 516 * @vm: the amdgpu_vm structure to query 517 * 518 * Returns the tlb flush sequence number which indicates that the VM TLBs needs 519 * to be invalidated whenever the sequence number change. 520 */ 521 static inline uint64_t amdgpu_vm_tlb_seq(struct amdgpu_vm *vm) 522 { 523 unsigned long flags; 524 spinlock_t *lock; 525 526 /* 527 * Workaround to stop racing between the fence signaling and handling 528 * the cb. The lock is static after initially setting it up, just make 529 * sure that the dma_fence structure isn't freed up. 530 */ 531 rcu_read_lock(); 532 lock = vm->last_tlb_flush->lock; 533 rcu_read_unlock(); 534 535 spin_lock_irqsave(lock, flags); 536 spin_unlock_irqrestore(lock, flags); 537 538 return atomic64_read(&vm->tlb_seq); 539 } 540 541 /* 542 * vm eviction_lock can be taken in MMU notifiers. Make sure no reclaim-FS 543 * happens while holding this lock anywhere to prevent deadlocks when 544 * an MMU notifier runs in reclaim-FS context. 545 */ 546 static inline void amdgpu_vm_eviction_lock(struct amdgpu_vm *vm) 547 { 548 mutex_lock(&vm->eviction_lock); 549 #ifdef notyet 550 vm->saved_flags = memalloc_noreclaim_save(); 551 #endif 552 } 553 554 static inline bool amdgpu_vm_eviction_trylock(struct amdgpu_vm *vm) 555 { 556 if (mutex_trylock(&vm->eviction_lock)) { 557 #ifdef notyet 558 vm->saved_flags = memalloc_noreclaim_save(); 559 #endif 560 return true; 561 } 562 return false; 563 } 564 565 static inline void amdgpu_vm_eviction_unlock(struct amdgpu_vm *vm) 566 { 567 #ifdef notyet 568 memalloc_noreclaim_restore(vm->saved_flags); 569 #endif 570 mutex_unlock(&vm->eviction_lock); 571 } 572 573 #endif 574