drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright 2014-2018 Advanced Micro Devices, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23 #include <linux/dma-buf.h>
  24 #include <linux/list.h>
  25 #include <linux/pagemap.h>
  26 #include <linux/sched/mm.h>
  27 #include <linux/sched/task.h>
  28 #include <linux/fdtable.h>
  29 #include <drm/ttm/ttm_tt.h>
  30
  31 #include <drm/drm_exec.h>
  32
  33 #include "amdgpu_object.h"
  34 #include "amdgpu_gem.h"
  35 #include "amdgpu_vm.h"
  36 #include "amdgpu_hmm.h"
  37 #include "amdgpu_amdkfd.h"
  38 #include "amdgpu_dma_buf.h"
  39 #include <uapi/linux/kfd_ioctl.h>
  40 #include "amdgpu_xgmi.h"
  41 #include "kfd_priv.h"
  42 #include "kfd_smi_events.h"
  43
  44 /* Userptr restore delay, just long enough to allow consecutive VM
  45  * changes to accumulate
  46  */
  47 #define AMDGPU_USERPTR_RESTORE_DELAY_MS 1
  48 #define AMDGPU_RESERVE_MEM_LIMIT                        (3UL << 29)
  49
  50 /*
  51  * Align VRAM availability to 2MB to avoid fragmentation caused by 4K allocations in the tail 2MB
  52  * BO chunk
  53  */
  54 #define VRAM_AVAILABLITY_ALIGN (1 << 21)
  55
  56 /* Impose limit on how much memory KFD can use */
  57 static struct {
  58         uint64_t max_system_mem_limit;
  59         uint64_t max_ttm_mem_limit;
  60         int64_t system_mem_used;
  61         int64_t ttm_mem_used;
  62         spinlock_t mem_limit_lock;
  63 } kfd_mem_limit;
  64
  65 static const char * const domain_bit_to_string[] = {
  66                 "CPU",
  67                 "GTT",
  68                 "VRAM",
  69                 "GDS",
  70                 "GWS",
  71                 "OA"
  72 };
  73
  74 #define domain_string(domain) domain_bit_to_string[ffs(domain)-1]
  75
  76 static void amdgpu_amdkfd_restore_userptr_worker(struct work_struct *work);
  77
  78 static bool kfd_mem_is_attached(struct amdgpu_vm *avm,
  79                 struct kgd_mem *mem)
  80 {
  81         struct kfd_mem_attachment *entry;
  82
  83         list_for_each_entry(entry, &mem->attachments, list)
  84                 if (entry->bo_va->base.vm == avm)
  85                         return true;
  86
  87         return false;
  88 }
  89
  90 /**
  91  * reuse_dmamap() - Check whether adev can share the original
  92  * userptr BO
  93  *
  94  * If both adev and bo_adev are in direct mapping or
  95  * in the same iommu group, they can share the original BO.
  96  *
  97  * @adev: Device to which can or cannot share the original BO
  98  * @bo_adev: Device to which allocated BO belongs to
  99  *
 100  * Return: returns true if adev can share original userptr BO,
 101  * false otherwise.
 102  */
 103 static bool reuse_dmamap(struct amdgpu_device *adev, struct amdgpu_device *bo_adev)
 104 {
 105         return (adev->ram_is_direct_mapped && bo_adev->ram_is_direct_mapped) ||
 106                         (adev->dev->iommu_group == bo_adev->dev->iommu_group);
 107 }
 108
 109 /* Set memory usage limits. Current, limits are
 110  *  System (TTM + userptr) memory - 15/16th System RAM
 111  *  TTM memory - 3/8th System RAM
 112  */
 113 void amdgpu_amdkfd_gpuvm_init_mem_limits(void)
 114 {
 115         struct sysinfo si;
 116         uint64_t mem;
 117
 118         if (kfd_mem_limit.max_system_mem_limit)
 119                 return;
 120
 121         si_meminfo(&si);
 122         mem = si.totalram - si.totalhigh;
 123         mem *= si.mem_unit;
 124
 125         spin_lock_init(&kfd_mem_limit.mem_limit_lock);
 126         kfd_mem_limit.max_system_mem_limit = mem - (mem >> 6);
 127         if (kfd_mem_limit.max_system_mem_limit < 2 * AMDGPU_RESERVE_MEM_LIMIT)
 128                 kfd_mem_limit.max_system_mem_limit >>= 1;
 129         else
 130                 kfd_mem_limit.max_system_mem_limit -= AMDGPU_RESERVE_MEM_LIMIT;
 131
 132         kfd_mem_limit.max_ttm_mem_limit = ttm_tt_pages_limit() << PAGE_SHIFT;
 133         pr_debug("Kernel memory limit %lluM, TTM limit %lluM\n",
 134                 (kfd_mem_limit.max_system_mem_limit >> 20),
 135                 (kfd_mem_limit.max_ttm_mem_limit >> 20));
 136 }
 137
 138 void amdgpu_amdkfd_reserve_system_mem(uint64_t size)
 139 {
 140         kfd_mem_limit.system_mem_used += size;
 141 }
 142
 143 /* Estimate page table size needed to represent a given memory size
 144  *
 145  * With 4KB pages, we need one 8 byte PTE for each 4KB of memory
 146  * (factor 512, >> 9). With 2MB pages, we need one 8 byte PTE for 2MB
 147  * of memory (factor 256K, >> 18). ROCm user mode tries to optimize
 148  * for 2MB pages for TLB efficiency. However, small allocations and
 149  * fragmented system memory still need some 4KB pages. We choose a
 150  * compromise that should work in most cases without reserving too
 151  * much memory for page tables unnecessarily (factor 16K, >> 14).
 152  */
 153
 154 #define ESTIMATE_PT_SIZE(mem_size) max(((mem_size) >> 14), AMDGPU_VM_RESERVED_VRAM)
 155
 156 /**
 157  * amdgpu_amdkfd_reserve_mem_limit() - Decrease available memory by size
 158  * of buffer.
 159  *
 160  * @adev: Device to which allocated BO belongs to
 161  * @size: Size of buffer, in bytes, encapsulated by B0. This should be
 162  * equivalent to amdgpu_bo_size(BO)
 163  * @alloc_flag: Flag used in allocating a BO as noted above
 164  * @xcp_id: xcp_id is used to get xcp from xcp manager, one xcp is
 165  * managed as one compute node in driver for app
 166  *
 167  * Return:
 168  *      returns -ENOMEM in case of error, ZERO otherwise
 169  */
 170 int amdgpu_amdkfd_reserve_mem_limit(struct amdgpu_device *adev,
 171                 uint64_t size, u32 alloc_flag, int8_t xcp_id)
 172 {
 173         uint64_t reserved_for_pt =
 174                 ESTIMATE_PT_SIZE(amdgpu_amdkfd_total_mem_size);
 175         size_t system_mem_needed, ttm_mem_needed, vram_needed;
 176         int ret = 0;
 177         uint64_t vram_size = 0;
 178
 179         system_mem_needed = 0;
 180         ttm_mem_needed = 0;
 181         vram_needed = 0;
 182         if (alloc_flag & KFD_IOC_ALLOC_MEM_FLAGS_GTT) {
 183                 system_mem_needed = size;
 184                 ttm_mem_needed = size;
 185         } else if (alloc_flag & KFD_IOC_ALLOC_MEM_FLAGS_VRAM) {
 186                 /*
 187                  * Conservatively round up the allocation requirement to 2 MB
 188                  * to avoid fragmentation caused by 4K allocations in the tail
 189                  * 2M BO chunk.
 190                  */
 191                 vram_needed = size;
 192                 /*
 193                  * For GFX 9.4.3, get the VRAM size from XCP structs
 194                  */
 195                 if (WARN_ONCE(xcp_id < 0, "invalid XCP ID %d", xcp_id))
 196                         return -EINVAL;
 197
 198                 vram_size = KFD_XCP_MEMORY_SIZE(adev, xcp_id);
 199                 if (adev->gmc.is_app_apu) {
 200                         system_mem_needed = size;
 201                         ttm_mem_needed = size;
 202                 }
 203         } else if (alloc_flag & KFD_IOC_ALLOC_MEM_FLAGS_USERPTR) {
 204                 system_mem_needed = size;
 205         } else if (!(alloc_flag &
 206                                 (KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL |
 207                                  KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP))) {
 208                 pr_err("%s: Invalid BO type %#x\n", __func__, alloc_flag);
 209                 return -ENOMEM;
 210         }
 211
 212         spin_lock(&kfd_mem_limit.mem_limit_lock);
 213
 214         if (kfd_mem_limit.system_mem_used + system_mem_needed >
 215             kfd_mem_limit.max_system_mem_limit)
 216                 pr_debug("Set no_system_mem_limit=1 if using shared memory\n");
 217
 218         if ((kfd_mem_limit.system_mem_used + system_mem_needed >
 219              kfd_mem_limit.max_system_mem_limit && !no_system_mem_limit) ||
 220             (kfd_mem_limit.ttm_mem_used + ttm_mem_needed >
 221              kfd_mem_limit.max_ttm_mem_limit) ||
 222             (adev && xcp_id >= 0 && adev->kfd.vram_used[xcp_id] + vram_needed >
 223              vram_size - reserved_for_pt)) {
 224                 ret = -ENOMEM;
 225                 goto release;
 226         }
 227
 228         /* Update memory accounting by decreasing available system
 229          * memory, TTM memory and GPU memory as computed above
 230          */
 231         WARN_ONCE(vram_needed && !adev,
 232                   "adev reference can't be null when vram is used");
 233         if (adev && xcp_id >= 0) {
 234                 adev->kfd.vram_used[xcp_id] += vram_needed;
 235                 adev->kfd.vram_used_aligned[xcp_id] += adev->gmc.is_app_apu ?
 236                                 vram_needed :
 237                                 ALIGN(vram_needed, VRAM_AVAILABLITY_ALIGN);
 238         }
 239         kfd_mem_limit.system_mem_used += system_mem_needed;
 240         kfd_mem_limit.ttm_mem_used += ttm_mem_needed;
 241
 242 release:
 243         spin_unlock(&kfd_mem_limit.mem_limit_lock);
 244         return ret;
 245 }
 246
 247 void amdgpu_amdkfd_unreserve_mem_limit(struct amdgpu_device *adev,
 248                 uint64_t size, u32 alloc_flag, int8_t xcp_id)
 249 {
 250         spin_lock(&kfd_mem_limit.mem_limit_lock);
 251
 252         if (alloc_flag & KFD_IOC_ALLOC_MEM_FLAGS_GTT) {
 253                 kfd_mem_limit.system_mem_used -= size;
 254                 kfd_mem_limit.ttm_mem_used -= size;
 255         } else if (alloc_flag & KFD_IOC_ALLOC_MEM_FLAGS_VRAM) {
 256                 WARN_ONCE(!adev,
 257                           "adev reference can't be null when alloc mem flags vram is set");
 258                 if (WARN_ONCE(xcp_id < 0, "invalid XCP ID %d", xcp_id))
 259                         goto release;
 260
 261                 if (adev) {
 262                         adev->kfd.vram_used[xcp_id] -= size;
 263                         if (adev->gmc.is_app_apu) {
 264                                 adev->kfd.vram_used_aligned[xcp_id] -= size;
 265                                 kfd_mem_limit.system_mem_used -= size;
 266                                 kfd_mem_limit.ttm_mem_used -= size;
 267                         } else {
 268                                 adev->kfd.vram_used_aligned[xcp_id] -=
 269                                         ALIGN(size, VRAM_AVAILABLITY_ALIGN);
 270                         }
 271                 }
 272         } else if (alloc_flag & KFD_IOC_ALLOC_MEM_FLAGS_USERPTR) {
 273                 kfd_mem_limit.system_mem_used -= size;
 274         } else if (!(alloc_flag &
 275                                 (KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL |
 276                                  KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP))) {
 277                 pr_err("%s: Invalid BO type %#x\n", __func__, alloc_flag);
 278                 goto release;
 279         }
 280         WARN_ONCE(adev && xcp_id >= 0 && adev->kfd.vram_used[xcp_id] < 0,
 281                   "KFD VRAM memory accounting unbalanced for xcp: %d", xcp_id);
 282         WARN_ONCE(kfd_mem_limit.ttm_mem_used < 0,
 283                   "KFD TTM memory accounting unbalanced");
 284         WARN_ONCE(kfd_mem_limit.system_mem_used < 0,
 285                   "KFD system memory accounting unbalanced");
 286
 287 release:
 288         spin_unlock(&kfd_mem_limit.mem_limit_lock);
 289 }
 290
 291 void amdgpu_amdkfd_release_notify(struct amdgpu_bo *bo)
 292 {
 293         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 294         u32 alloc_flags = bo->kfd_bo->alloc_flags;
 295         u64 size = amdgpu_bo_size(bo);
 296
 297         amdgpu_amdkfd_unreserve_mem_limit(adev, size, alloc_flags,
 298                                           bo->xcp_id);
 299
 300         kfree(bo->kfd_bo);
 301 }
 302
 303 /**
 304  * create_dmamap_sg_bo() - Creates a amdgpu_bo object to reflect information
 305  * about USERPTR or DOOREBELL or MMIO BO.
 306  *
 307  * @adev: Device for which dmamap BO is being created
 308  * @mem: BO of peer device that is being DMA mapped. Provides parameters
 309  *       in building the dmamap BO
 310  * @bo_out: Output parameter updated with handle of dmamap BO
 311  */
 312 static int
 313 create_dmamap_sg_bo(struct amdgpu_device *adev,
 314                  struct kgd_mem *mem, struct amdgpu_bo **bo_out)
 315 {
 316         struct drm_gem_object *gem_obj;
 317         int ret;
 318         uint64_t flags = 0;
 319
 320         ret = amdgpu_bo_reserve(mem->bo, false);
 321         if (ret)
 322                 return ret;
 323
 324         if (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_USERPTR)
 325                 flags |= mem->bo->flags & (AMDGPU_GEM_CREATE_COHERENT |
 326                                         AMDGPU_GEM_CREATE_UNCACHED);
 327
 328         ret = amdgpu_gem_object_create(adev, mem->bo->tbo.base.size, 1,
 329                         AMDGPU_GEM_DOMAIN_CPU, AMDGPU_GEM_CREATE_PREEMPTIBLE | flags,
 330                         ttm_bo_type_sg, mem->bo->tbo.base.resv, &gem_obj, 0);
 331
 332         amdgpu_bo_unreserve(mem->bo);
 333
 334         if (ret) {
 335                 pr_err("Error in creating DMA mappable SG BO on domain: %d\n", ret);
 336                 return -EINVAL;
 337         }
 338
 339         *bo_out = gem_to_amdgpu_bo(gem_obj);
 340         (*bo_out)->parent = amdgpu_bo_ref(mem->bo);
 341         return ret;
 342 }
 343
 344 /* amdgpu_amdkfd_remove_eviction_fence - Removes eviction fence from BO's
 345  *  reservation object.
 346  *
 347  * @bo: [IN] Remove eviction fence(s) from this BO
 348  * @ef: [IN] This eviction fence is removed if it
 349  *  is present in the shared list.
 350  *
 351  * NOTE: Must be called with BO reserved i.e. bo->tbo.resv->lock held.
 352  */
 353 static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
 354                                         struct amdgpu_amdkfd_fence *ef)
 355 {
 356         struct dma_fence *replacement;
 357
 358         if (!ef)
 359                 return -EINVAL;
 360
 361         /* TODO: Instead of block before we should use the fence of the page
 362          * table update and TLB flush here directly.
 363          */
 364         replacement = dma_fence_get_stub();
 365         dma_resv_replace_fences(bo->tbo.base.resv, ef->base.context,
 366                                 replacement, DMA_RESV_USAGE_BOOKKEEP);
 367         dma_fence_put(replacement);
 368         return 0;
 369 }
 370
 371 int amdgpu_amdkfd_remove_fence_on_pt_pd_bos(struct amdgpu_bo *bo)
 372 {
 373         struct amdgpu_bo *root = bo;
 374         struct amdgpu_vm_bo_base *vm_bo;
 375         struct amdgpu_vm *vm;
 376         struct amdkfd_process_info *info;
 377         struct amdgpu_amdkfd_fence *ef;
 378         int ret;
 379
 380         /* we can always get vm_bo from root PD bo.*/
 381         while (root->parent)
 382                 root = root->parent;
 383
 384         vm_bo = root->vm_bo;
 385         if (!vm_bo)
 386                 return 0;
 387
 388         vm = vm_bo->vm;
 389         if (!vm)
 390                 return 0;
 391
 392         info = vm->process_info;
 393         if (!info || !info->eviction_fence)
 394                 return 0;
 395
 396         ef = container_of(dma_fence_get(&info->eviction_fence->base),
 397                         struct amdgpu_amdkfd_fence, base);
 398
 399         BUG_ON(!dma_resv_trylock(bo->tbo.base.resv));
 400         ret = amdgpu_amdkfd_remove_eviction_fence(bo, ef);
 401         dma_resv_unlock(bo->tbo.base.resv);
 402
 403         dma_fence_put(&ef->base);
 404         return ret;
 405 }
 406
 407 static int amdgpu_amdkfd_bo_validate(struct amdgpu_bo *bo, uint32_t domain,
 408                                      bool wait)
 409 {
 410         struct ttm_operation_ctx ctx = { false, false };
 411         int ret;
 412
 413         if (WARN(amdgpu_ttm_tt_get_usermm(bo->tbo.ttm),
 414                  "Called with userptr BO"))
 415                 return -EINVAL;
 416
 417         amdgpu_bo_placement_from_domain(bo, domain);
 418
 419         ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 420         if (ret)
 421                 goto validate_fail;
 422         if (wait)
 423                 amdgpu_bo_sync_wait(bo, AMDGPU_FENCE_OWNER_KFD, false);
 424
 425 validate_fail:
 426         return ret;
 427 }
 428
 429 int amdgpu_amdkfd_bo_validate_and_fence(struct amdgpu_bo *bo,
 430                                         uint32_t domain,
 431                                         struct dma_fence *fence)
 432 {
 433         int ret = amdgpu_bo_reserve(bo, false);
 434
 435         if (ret)
 436                 return ret;
 437
 438         ret = amdgpu_amdkfd_bo_validate(bo, domain, true);
 439         if (ret)
 440                 goto unreserve_out;
 441
 442         ret = dma_resv_reserve_fences(bo->tbo.base.resv, 1);
 443         if (ret)
 444                 goto unreserve_out;
 445
 446         dma_resv_add_fence(bo->tbo.base.resv, fence,
 447                            DMA_RESV_USAGE_BOOKKEEP);
 448
 449 unreserve_out:
 450         amdgpu_bo_unreserve(bo);
 451
 452         return ret;
 453 }
 454
 455 static int amdgpu_amdkfd_validate_vm_bo(void *_unused, struct amdgpu_bo *bo)
 456 {
 457         return amdgpu_amdkfd_bo_validate(bo, bo->allowed_domains, false);
 458 }
 459
 460 /* vm_validate_pt_pd_bos - Validate page table and directory BOs
 461  *
 462  * Page directories are not updated here because huge page handling
 463  * during page table updates can invalidate page directory entries
 464  * again. Page directories are only updated after updating page
 465  * tables.
 466  */
 467 static int vm_validate_pt_pd_bos(struct amdgpu_vm *vm,
 468                                  struct ww_acquire_ctx *ticket)
 469 {
 470         struct amdgpu_bo *pd = vm->root.bo;
 471         struct amdgpu_device *adev = amdgpu_ttm_adev(pd->tbo.bdev);
 472         int ret;
 473
 474         ret = amdgpu_vm_validate(adev, vm, ticket,
 475                                  amdgpu_amdkfd_validate_vm_bo, NULL);
 476         if (ret) {
 477                 pr_err("failed to validate PT BOs\n");
 478                 return ret;
 479         }
 480
 481         vm->pd_phys_addr = amdgpu_gmc_pd_addr(vm->root.bo);
 482
 483         return 0;
 484 }
 485
 486 static int vm_update_pds(struct amdgpu_vm *vm, struct amdgpu_sync *sync)
 487 {
 488         struct amdgpu_bo *pd = vm->root.bo;
 489         struct amdgpu_device *adev = amdgpu_ttm_adev(pd->tbo.bdev);
 490         int ret;
 491
 492         ret = amdgpu_vm_update_pdes(adev, vm, false);
 493         if (ret)
 494                 return ret;
 495
 496         return amdgpu_sync_fence(sync, vm->last_update);
 497 }
 498
 499 static uint64_t get_pte_flags(struct amdgpu_device *adev, struct kgd_mem *mem)
 500 {
 501         uint32_t mapping_flags = AMDGPU_VM_PAGE_READABLE |
 502                                  AMDGPU_VM_MTYPE_DEFAULT;
 503
 504         if (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE)
 505                 mapping_flags |= AMDGPU_VM_PAGE_WRITEABLE;
 506         if (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE)
 507                 mapping_flags |= AMDGPU_VM_PAGE_EXECUTABLE;
 508
 509         return amdgpu_gem_va_map_flags(adev, mapping_flags);
 510 }
 511
 512 /**
 513  * create_sg_table() - Create an sg_table for a contiguous DMA addr range
 514  * @addr: The starting address to point to
 515  * @size: Size of memory area in bytes being pointed to
 516  *
 517  * Allocates an instance of sg_table and initializes it to point to memory
 518  * area specified by input parameters. The address used to build is assumed
 519  * to be DMA mapped, if needed.
 520  *
 521  * DOORBELL or MMIO BOs use only one scatterlist node in their sg_table
 522  * because they are physically contiguous.
 523  *
 524  * Return: Initialized instance of SG Table or NULL
 525  */
 526 static struct sg_table *create_sg_table(uint64_t addr, uint32_t size)
 527 {
 528         struct sg_table *sg = kmalloc(sizeof(*sg), GFP_KERNEL);
 529
 530         if (!sg)
 531                 return NULL;
 532         if (sg_alloc_table(sg, 1, GFP_KERNEL)) {
 533                 kfree(sg);
 534                 return NULL;
 535         }
 536         sg_dma_address(sg->sgl) = addr;
 537         sg->sgl->length = size;
 538 #ifdef CONFIG_NEED_SG_DMA_LENGTH
 539         sg->sgl->dma_length = size;
 540 #endif
 541         return sg;
 542 }
 543
 544 static int
 545 kfd_mem_dmamap_userptr(struct kgd_mem *mem,
 546                        struct kfd_mem_attachment *attachment)
 547 {
 548         enum dma_data_direction direction =
 549                 mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE ?
 550                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 551         struct ttm_operation_ctx ctx = {.interruptible = true};
 552         struct amdgpu_bo *bo = attachment->bo_va->base.bo;
 553         struct amdgpu_device *adev = attachment->adev;
 554         struct ttm_tt *src_ttm = mem->bo->tbo.ttm;
 555         struct ttm_tt *ttm = bo->tbo.ttm;
 556         int ret;
 557
 558         if (WARN_ON(ttm->num_pages != src_ttm->num_pages))
 559                 return -EINVAL;
 560
 561         ttm->sg = kmalloc(sizeof(*ttm->sg), GFP_KERNEL);
 562         if (unlikely(!ttm->sg))
 563                 return -ENOMEM;
 564
 565         /* Same sequence as in amdgpu_ttm_tt_pin_userptr */
 566         ret = sg_alloc_table_from_pages(ttm->sg, src_ttm->pages,
 567                                         ttm->num_pages, 0,
 568                                         (u64)ttm->num_pages << PAGE_SHIFT,
 569                                         GFP_KERNEL);
 570         if (unlikely(ret))
 571                 goto free_sg;
 572
 573         ret = dma_map_sgtable(adev->dev, ttm->sg, direction, 0);
 574         if (unlikely(ret))
 575                 goto release_sg;
 576
 577         amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT);
 578         ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 579         if (ret)
 580                 goto unmap_sg;
 581
 582         return 0;
 583
 584 unmap_sg:
 585         dma_unmap_sgtable(adev->dev, ttm->sg, direction, 0);
 586 release_sg:
 587         pr_err("DMA map userptr failed: %d\n", ret);
 588         sg_free_table(ttm->sg);
 589 free_sg:
 590         kfree(ttm->sg);
 591         ttm->sg = NULL;
 592         return ret;
 593 }
 594
 595 static int
 596 kfd_mem_dmamap_dmabuf(struct kfd_mem_attachment *attachment)
 597 {
 598         struct ttm_operation_ctx ctx = {.interruptible = true};
 599         struct amdgpu_bo *bo = attachment->bo_va->base.bo;
 600         int ret;
 601
 602         amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
 603         ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 604         if (ret)
 605                 return ret;
 606
 607         amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT);
 608         return ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 609 }
 610
 611 /**
 612  * kfd_mem_dmamap_sg_bo() - Create DMA mapped sg_table to access DOORBELL or MMIO BO
 613  * @mem: SG BO of the DOORBELL or MMIO resource on the owning device
 614  * @attachment: Virtual address attachment of the BO on accessing device
 615  *
 616  * An access request from the device that owns DOORBELL does not require DMA mapping.
 617  * This is because the request doesn't go through PCIe root complex i.e. it instead
 618  * loops back. The need to DMA map arises only when accessing peer device's DOORBELL
 619  *
 620  * In contrast, all access requests for MMIO need to be DMA mapped without regard to
 621  * device ownership. This is because access requests for MMIO go through PCIe root
 622  * complex.
 623  *
 624  * This is accomplished in two steps:
 625  *   - Obtain DMA mapped address of DOORBELL or MMIO memory that could be used
 626  *         in updating requesting device's page table
 627  *   - Signal TTM to mark memory pointed to by requesting device's BO as GPU
 628  *         accessible. This allows an update of requesting device's page table
 629  *         with entries associated with DOOREBELL or MMIO memory
 630  *
 631  * This method is invoked in the following contexts:
 632  *   - Mapping of DOORBELL or MMIO BO of same or peer device
 633  *   - Validating an evicted DOOREBELL or MMIO BO on device seeking access
 634  *
 635  * Return: ZERO if successful, NON-ZERO otherwise
 636  */
 637 static int
 638 kfd_mem_dmamap_sg_bo(struct kgd_mem *mem,
 639                      struct kfd_mem_attachment *attachment)
 640 {
 641         struct ttm_operation_ctx ctx = {.interruptible = true};
 642         struct amdgpu_bo *bo = attachment->bo_va->base.bo;
 643         struct amdgpu_device *adev = attachment->adev;
 644         struct ttm_tt *ttm = bo->tbo.ttm;
 645         enum dma_data_direction dir;
 646         dma_addr_t dma_addr;
 647         bool mmio;
 648         int ret;
 649
 650         /* Expect SG Table of dmapmap BO to be NULL */
 651         mmio = (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP);
 652         if (unlikely(ttm->sg)) {
 653                 pr_err("SG Table of %d BO for peer device is UNEXPECTEDLY NON-NULL", mmio);
 654                 return -EINVAL;
 655         }
 656
 657         dir = mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE ?
 658                         DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 659         dma_addr = mem->bo->tbo.sg->sgl->dma_address;
 660         pr_debug("%d BO size: %d\n", mmio, mem->bo->tbo.sg->sgl->length);
 661         pr_debug("%d BO address before DMA mapping: %llx\n", mmio, dma_addr);
 662         dma_addr = dma_map_resource(adev->dev, dma_addr,
 663                         mem->bo->tbo.sg->sgl->length, dir, DMA_ATTR_SKIP_CPU_SYNC);
 664         ret = dma_mapping_error(adev->dev, dma_addr);
 665         if (unlikely(ret))
 666                 return ret;
 667         pr_debug("%d BO address after DMA mapping: %llx\n", mmio, dma_addr);
 668
 669         ttm->sg = create_sg_table(dma_addr, mem->bo->tbo.sg->sgl->length);
 670         if (unlikely(!ttm->sg)) {
 671                 ret = -ENOMEM;
 672                 goto unmap_sg;
 673         }
 674
 675         amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT);
 676         ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 677         if (unlikely(ret))
 678                 goto free_sg;
 679
 680         return ret;
 681
 682 free_sg:
 683         sg_free_table(ttm->sg);
 684         kfree(ttm->sg);
 685         ttm->sg = NULL;
 686 unmap_sg:
 687         dma_unmap_resource(adev->dev, dma_addr, mem->bo->tbo.sg->sgl->length,
 688                            dir, DMA_ATTR_SKIP_CPU_SYNC);
 689         return ret;
 690 }
 691
 692 static int
 693 kfd_mem_dmamap_attachment(struct kgd_mem *mem,
 694                           struct kfd_mem_attachment *attachment)
 695 {
 696         switch (attachment->type) {
 697         case KFD_MEM_ATT_SHARED:
 698                 return 0;
 699         case KFD_MEM_ATT_USERPTR:
 700                 return kfd_mem_dmamap_userptr(mem, attachment);
 701         case KFD_MEM_ATT_DMABUF:
 702                 return kfd_mem_dmamap_dmabuf(attachment);
 703         case KFD_MEM_ATT_SG:
 704                 return kfd_mem_dmamap_sg_bo(mem, attachment);
 705         default:
 706                 WARN_ON_ONCE(1);
 707         }
 708         return -EINVAL;
 709 }
 710
 711 static void
 712 kfd_mem_dmaunmap_userptr(struct kgd_mem *mem,
 713                          struct kfd_mem_attachment *attachment)
 714 {
 715         enum dma_data_direction direction =
 716                 mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE ?
 717                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 718         struct ttm_operation_ctx ctx = {.interruptible = false};
 719         struct amdgpu_bo *bo = attachment->bo_va->base.bo;
 720         struct amdgpu_device *adev = attachment->adev;
 721         struct ttm_tt *ttm = bo->tbo.ttm;
 722
 723         if (unlikely(!ttm->sg))
 724                 return;
 725
 726         amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
 727         ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 728
 729         dma_unmap_sgtable(adev->dev, ttm->sg, direction, 0);
 730         sg_free_table(ttm->sg);
 731         kfree(ttm->sg);
 732         ttm->sg = NULL;
 733 }
 734
 735 static void
 736 kfd_mem_dmaunmap_dmabuf(struct kfd_mem_attachment *attachment)
 737 {
 738         /* This is a no-op. We don't want to trigger eviction fences when
 739          * unmapping DMABufs. Therefore the invalidation (moving to system
 740          * domain) is done in kfd_mem_dmamap_dmabuf.
 741          */
 742 }
 743
 744 /**
 745  * kfd_mem_dmaunmap_sg_bo() - Free DMA mapped sg_table of DOORBELL or MMIO BO
 746  * @mem: SG BO of the DOORBELL or MMIO resource on the owning device
 747  * @attachment: Virtual address attachment of the BO on accessing device
 748  *
 749  * The method performs following steps:
 750  *   - Signal TTM to mark memory pointed to by BO as GPU inaccessible
 751  *   - Free SG Table that is used to encapsulate DMA mapped memory of
 752  *          peer device's DOORBELL or MMIO memory
 753  *
 754  * This method is invoked in the following contexts:
 755  *     UNMapping of DOORBELL or MMIO BO on a device having access to its memory
 756  *     Eviction of DOOREBELL or MMIO BO on device having access to its memory
 757  *
 758  * Return: void
 759  */
 760 static void
 761 kfd_mem_dmaunmap_sg_bo(struct kgd_mem *mem,
 762                        struct kfd_mem_attachment *attachment)
 763 {
 764         struct ttm_operation_ctx ctx = {.interruptible = true};
 765         struct amdgpu_bo *bo = attachment->bo_va->base.bo;
 766         struct amdgpu_device *adev = attachment->adev;
 767         struct ttm_tt *ttm = bo->tbo.ttm;
 768         enum dma_data_direction dir;
 769
 770         if (unlikely(!ttm->sg)) {
 771                 pr_debug("SG Table of BO is NULL");
 772                 return;
 773         }
 774
 775         amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
 776         ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 777
 778         dir = mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE ?
 779                                 DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 780         dma_unmap_resource(adev->dev, ttm->sg->sgl->dma_address,
 781                         ttm->sg->sgl->length, dir, DMA_ATTR_SKIP_CPU_SYNC);
 782         sg_free_table(ttm->sg);
 783         kfree(ttm->sg);
 784         ttm->sg = NULL;
 785         bo->tbo.sg = NULL;
 786 }
 787
 788 static void
 789 kfd_mem_dmaunmap_attachment(struct kgd_mem *mem,
 790                             struct kfd_mem_attachment *attachment)
 791 {
 792         switch (attachment->type) {
 793         case KFD_MEM_ATT_SHARED:
 794                 break;
 795         case KFD_MEM_ATT_USERPTR:
 796                 kfd_mem_dmaunmap_userptr(mem, attachment);
 797                 break;
 798         case KFD_MEM_ATT_DMABUF:
 799                 kfd_mem_dmaunmap_dmabuf(attachment);
 800                 break;
 801         case KFD_MEM_ATT_SG:
 802                 kfd_mem_dmaunmap_sg_bo(mem, attachment);
 803                 break;
 804         default:
 805                 WARN_ON_ONCE(1);
 806         }
 807 }
 808
 809 static int kfd_mem_export_dmabuf(struct kgd_mem *mem)
 810 {
 811         if (!mem->dmabuf) {
 812                 struct amdgpu_device *bo_adev;
 813                 struct dma_buf *dmabuf;
 814                 int r, fd;
 815
 816                 bo_adev = amdgpu_ttm_adev(mem->bo->tbo.bdev);
 817                 r = drm_gem_prime_handle_to_fd(&bo_adev->ddev, bo_adev->kfd.client.file,
 818                                                mem->gem_handle,
 819                         mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE ?
 820                                                DRM_RDWR : 0, &fd);
 821                 if (r)
 822                         return r;
 823                 dmabuf = dma_buf_get(fd);
 824                 close_fd(fd);
 825                 if (WARN_ON_ONCE(IS_ERR(dmabuf)))
 826                         return PTR_ERR(dmabuf);
 827                 mem->dmabuf = dmabuf;
 828         }
 829
 830         return 0;
 831 }
 832
 833 static int
 834 kfd_mem_attach_dmabuf(struct amdgpu_device *adev, struct kgd_mem *mem,
 835                       struct amdgpu_bo **bo)
 836 {
 837         struct drm_gem_object *gobj;
 838         int ret;
 839
 840         ret = kfd_mem_export_dmabuf(mem);
 841         if (ret)
 842                 return ret;
 843
 844         gobj = amdgpu_gem_prime_import(adev_to_drm(adev), mem->dmabuf);
 845         if (IS_ERR(gobj))
 846                 return PTR_ERR(gobj);
 847
 848         *bo = gem_to_amdgpu_bo(gobj);
 849         (*bo)->flags |= AMDGPU_GEM_CREATE_PREEMPTIBLE;
 850
 851         return 0;
 852 }
 853
 854 /* kfd_mem_attach - Add a BO to a VM
 855  *
 856  * Everything that needs to bo done only once when a BO is first added
 857  * to a VM. It can later be mapped and unmapped many times without
 858  * repeating these steps.
 859  *
 860  * 0. Create BO for DMA mapping, if needed
 861  * 1. Allocate and initialize BO VA entry data structure
 862  * 2. Add BO to the VM
 863  * 3. Determine ASIC-specific PTE flags
 864  * 4. Alloc page tables and directories if needed
 865  * 4a.  Validate new page tables and directories
 866  */
 867 static int kfd_mem_attach(struct amdgpu_device *adev, struct kgd_mem *mem,
 868                 struct amdgpu_vm *vm, bool is_aql)
 869 {
 870         struct amdgpu_device *bo_adev = amdgpu_ttm_adev(mem->bo->tbo.bdev);
 871         unsigned long bo_size = mem->bo->tbo.base.size;
 872         uint64_t va = mem->va;
 873         struct kfd_mem_attachment *attachment[2] = {NULL, NULL};
 874         struct amdgpu_bo *bo[2] = {NULL, NULL};
 875         struct amdgpu_bo_va *bo_va;
 876         bool same_hive = false;
 877         int i, ret;
 878
 879         if (!va) {
 880                 pr_err("Invalid VA when adding BO to VM\n");
 881                 return -EINVAL;
 882         }
 883
 884         /* Determine access to VRAM, MMIO and DOORBELL BOs of peer devices
 885          *
 886          * The access path of MMIO and DOORBELL BOs of is always over PCIe.
 887          * In contrast the access path of VRAM BOs depens upon the type of
 888          * link that connects the peer device. Access over PCIe is allowed
 889          * if peer device has large BAR. In contrast, access over xGMI is
 890          * allowed for both small and large BAR configurations of peer device
 891          */
 892         if ((adev != bo_adev && !adev->gmc.is_app_apu) &&
 893             ((mem->domain == AMDGPU_GEM_DOMAIN_VRAM) ||
 894              (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL) ||
 895              (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP))) {
 896                 if (mem->domain == AMDGPU_GEM_DOMAIN_VRAM)
 897                         same_hive = amdgpu_xgmi_same_hive(adev, bo_adev);
 898                 if (!same_hive && !amdgpu_device_is_peer_accessible(bo_adev, adev))
 899                         return -EINVAL;
 900         }
 901
 902         for (i = 0; i <= is_aql; i++) {
 903                 attachment[i] = kzalloc(sizeof(*attachment[i]), GFP_KERNEL);
 904                 if (unlikely(!attachment[i])) {
 905                         ret = -ENOMEM;
 906                         goto unwind;
 907                 }
 908
 909                 pr_debug("\t add VA 0x%llx - 0x%llx to vm %p\n", va,
 910                          va + bo_size, vm);
 911
 912                 if ((adev == bo_adev && !(mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP)) ||
 913                     (amdgpu_ttm_tt_get_usermm(mem->bo->tbo.ttm) && reuse_dmamap(adev, bo_adev)) ||
 914                     (mem->domain == AMDGPU_GEM_DOMAIN_GTT && reuse_dmamap(adev, bo_adev)) ||
 915                     same_hive) {
 916                         /* Mappings on the local GPU, or VRAM mappings in the
 917                          * local hive, or userptr, or GTT mapping can reuse dma map
 918                          * address space share the original BO
 919                          */
 920                         attachment[i]->type = KFD_MEM_ATT_SHARED;
 921                         bo[i] = mem->bo;
 922                         drm_gem_object_get(&bo[i]->tbo.base);
 923                 } else if (i > 0) {
 924                         /* Multiple mappings on the same GPU share the BO */
 925                         attachment[i]->type = KFD_MEM_ATT_SHARED;
 926                         bo[i] = bo[0];
 927                         drm_gem_object_get(&bo[i]->tbo.base);
 928                 } else if (amdgpu_ttm_tt_get_usermm(mem->bo->tbo.ttm)) {
 929                         /* Create an SG BO to DMA-map userptrs on other GPUs */
 930                         attachment[i]->type = KFD_MEM_ATT_USERPTR;
 931                         ret = create_dmamap_sg_bo(adev, mem, &bo[i]);
 932                         if (ret)
 933                                 goto unwind;
 934                 /* Handle DOORBELL BOs of peer devices and MMIO BOs of local and peer devices */
 935                 } else if (mem->bo->tbo.type == ttm_bo_type_sg) {
 936                         WARN_ONCE(!(mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL ||
 937                                     mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP),
 938                                   "Handing invalid SG BO in ATTACH request");
 939                         attachment[i]->type = KFD_MEM_ATT_SG;
 940                         ret = create_dmamap_sg_bo(adev, mem, &bo[i]);
 941                         if (ret)
 942                                 goto unwind;
 943                 /* Enable acces to GTT and VRAM BOs of peer devices */
 944                 } else if (mem->domain == AMDGPU_GEM_DOMAIN_GTT ||
 945                            mem->domain == AMDGPU_GEM_DOMAIN_VRAM) {
 946                         attachment[i]->type = KFD_MEM_ATT_DMABUF;
 947                         ret = kfd_mem_attach_dmabuf(adev, mem, &bo[i]);
 948                         if (ret)
 949                                 goto unwind;
 950                         pr_debug("Employ DMABUF mechanism to enable peer GPU access\n");
 951                 } else {
 952                         WARN_ONCE(true, "Handling invalid ATTACH request");
 953                         ret = -EINVAL;
 954                         goto unwind;
 955                 }
 956
 957                 /* Add BO to VM internal data structures */
 958                 ret = amdgpu_bo_reserve(bo[i], false);
 959                 if (ret) {
 960                         pr_debug("Unable to reserve BO during memory attach");
 961                         goto unwind;
 962                 }
 963                 bo_va = amdgpu_vm_bo_find(vm, bo[i]);
 964                 if (!bo_va)
 965                         bo_va = amdgpu_vm_bo_add(adev, vm, bo[i]);
 966                 else
 967                         ++bo_va->ref_count;
 968                 attachment[i]->bo_va = bo_va;
 969                 amdgpu_bo_unreserve(bo[i]);
 970                 if (unlikely(!attachment[i]->bo_va)) {
 971                         ret = -ENOMEM;
 972                         pr_err("Failed to add BO object to VM. ret == %d\n",
 973                                ret);
 974                         goto unwind;
 975                 }
 976                 attachment[i]->va = va;
 977                 attachment[i]->pte_flags = get_pte_flags(adev, mem);
 978                 attachment[i]->adev = adev;
 979                 list_add(&attachment[i]->list, &mem->attachments);
 980
 981                 va += bo_size;
 982         }
 983
 984         return 0;
 985
 986 unwind:
 987         for (; i >= 0; i--) {
 988                 if (!attachment[i])
 989                         continue;
 990                 if (attachment[i]->bo_va) {
 991                         amdgpu_bo_reserve(bo[i], true);
 992                         if (--attachment[i]->bo_va->ref_count == 0)
 993                                 amdgpu_vm_bo_del(adev, attachment[i]->bo_va);
 994                         amdgpu_bo_unreserve(bo[i]);
 995                         list_del(&attachment[i]->list);
 996                 }
 997                 if (bo[i])
 998                         drm_gem_object_put(&bo[i]->tbo.base);
 999                 kfree(attachment[i]);
1000         }
1001         return ret;
1002 }
1003
1004 static void kfd_mem_detach(struct kfd_mem_attachment *attachment)
1005 {
1006         struct amdgpu_bo *bo = attachment->bo_va->base.bo;
1007
1008         pr_debug("\t remove VA 0x%llx in entry %p\n",
1009                         attachment->va, attachment);
1010         if (--attachment->bo_va->ref_count == 0)
1011                 amdgpu_vm_bo_del(attachment->adev, attachment->bo_va);
1012         drm_gem_object_put(&bo->tbo.base);
1013         list_del(&attachment->list);
1014         kfree(attachment);
1015 }
1016
1017 static void add_kgd_mem_to_kfd_bo_list(struct kgd_mem *mem,
1018                                 struct amdkfd_process_info *process_info,
1019                                 bool userptr)
1020 {
1021         mutex_lock(&process_info->lock);
1022         if (userptr)
1023                 list_add_tail(&mem->validate_list,
1024                               &process_info->userptr_valid_list);
1025         else
1026                 list_add_tail(&mem->validate_list, &process_info->kfd_bo_list);
1027         mutex_unlock(&process_info->lock);
1028 }
1029
1030 static void remove_kgd_mem_from_kfd_bo_list(struct kgd_mem *mem,
1031                 struct amdkfd_process_info *process_info)
1032 {
1033         mutex_lock(&process_info->lock);
1034         list_del(&mem->validate_list);
1035         mutex_unlock(&process_info->lock);
1036 }
1037
1038 /* Initializes user pages. It registers the MMU notifier and validates
1039  * the userptr BO in the GTT domain.
1040  *
1041  * The BO must already be on the userptr_valid_list. Otherwise an
1042  * eviction and restore may happen that leaves the new BO unmapped
1043  * with the user mode queues running.
1044  *
1045  * Takes the process_info->lock to protect against concurrent restore
1046  * workers.
1047  *
1048  * Returns 0 for success, negative errno for errors.
1049  */
1050 static int init_user_pages(struct kgd_mem *mem, uint64_t user_addr,
1051                            bool criu_resume)
1052 {
1053         struct amdkfd_process_info *process_info = mem->process_info;
1054         struct amdgpu_bo *bo = mem->bo;
1055         struct ttm_operation_ctx ctx = { true, false };
1056         struct hmm_range *range;
1057         int ret = 0;
1058
1059         mutex_lock(&process_info->lock);
1060
1061         ret = amdgpu_ttm_tt_set_userptr(&bo->tbo, user_addr, 0);
1062         if (ret) {
1063                 pr_err("%s: Failed to set userptr: %d\n", __func__, ret);
1064                 goto out;
1065         }
1066
1067         ret = amdgpu_hmm_register(bo, user_addr);
1068         if (ret) {
1069                 pr_err("%s: Failed to register MMU notifier: %d\n",
1070                        __func__, ret);
1071                 goto out;
1072         }
1073
1074         if (criu_resume) {
1075                 /*
1076                  * During a CRIU restore operation, the userptr buffer objects
1077                  * will be validated in the restore_userptr_work worker at a
1078                  * later stage when it is scheduled by another ioctl called by
1079                  * CRIU master process for the target pid for restore.
1080                  */
1081                 mutex_lock(&process_info->notifier_lock);
1082                 mem->invalid++;
1083                 mutex_unlock(&process_info->notifier_lock);
1084                 mutex_unlock(&process_info->lock);
1085                 return 0;
1086         }
1087
1088         ret = amdgpu_ttm_tt_get_user_pages(bo, bo->tbo.ttm->pages, &range);
1089         if (ret) {
1090                 pr_err("%s: Failed to get user pages: %d\n", __func__, ret);
1091                 goto unregister_out;
1092         }
1093
1094         ret = amdgpu_bo_reserve(bo, true);
1095         if (ret) {
1096                 pr_err("%s: Failed to reserve BO\n", __func__);
1097                 goto release_out;
1098         }
1099         amdgpu_bo_placement_from_domain(bo, mem->domain);
1100         ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
1101         if (ret)
1102                 pr_err("%s: failed to validate BO\n", __func__);
1103         amdgpu_bo_unreserve(bo);
1104
1105 release_out:
1106         amdgpu_ttm_tt_get_user_pages_done(bo->tbo.ttm, range);
1107 unregister_out:
1108         if (ret)
1109                 amdgpu_hmm_unregister(bo);
1110 out:
1111         mutex_unlock(&process_info->lock);
1112         return ret;
1113 }
1114
1115 /* Reserving a BO and its page table BOs must happen atomically to
1116  * avoid deadlocks. Some operations update multiple VMs at once. Track
1117  * all the reservation info in a context structure. Optionally a sync
1118  * object can track VM updates.
1119  */
1120 struct bo_vm_reservation_context {
1121         /* DRM execution context for the reservation */
1122         struct drm_exec exec;
1123         /* Number of VMs reserved */
1124         unsigned int n_vms;
1125         /* Pointer to sync object */
1126         struct amdgpu_sync *sync;
1127 };
1128
1129 enum bo_vm_match {
1130         BO_VM_NOT_MAPPED = 0,   /* Match VMs where a BO is not mapped */
1131         BO_VM_MAPPED,           /* Match VMs where a BO is mapped     */
1132         BO_VM_ALL,              /* Match all VMs a BO was added to    */
1133 };
1134
1135 /**
1136  * reserve_bo_and_vm - reserve a BO and a VM unconditionally.
1137  * @mem: KFD BO structure.
1138  * @vm: the VM to reserve.
1139  * @ctx: the struct that will be used in unreserve_bo_and_vms().
1140  */
1141 static int reserve_bo_and_vm(struct kgd_mem *mem,
1142                               struct amdgpu_vm *vm,
1143                               struct bo_vm_reservation_context *ctx)
1144 {
1145         struct amdgpu_bo *bo = mem->bo;
1146         int ret;
1147
1148         WARN_ON(!vm);
1149
1150         ctx->n_vms = 1;
1151         ctx->sync = &mem->sync;
1152         drm_exec_init(&ctx->exec, DRM_EXEC_INTERRUPTIBLE_WAIT, 0);
1153         drm_exec_until_all_locked(&ctx->exec) {
1154                 ret = amdgpu_vm_lock_pd(vm, &ctx->exec, 2);
1155                 drm_exec_retry_on_contention(&ctx->exec);
1156                 if (unlikely(ret))
1157                         goto error;
1158
1159                 ret = drm_exec_prepare_obj(&ctx->exec, &bo->tbo.base, 1);
1160                 drm_exec_retry_on_contention(&ctx->exec);
1161                 if (unlikely(ret))
1162                         goto error;
1163         }
1164         return 0;
1165
1166 error:
1167         pr_err("Failed to reserve buffers in ttm.\n");
1168         drm_exec_fini(&ctx->exec);
1169         return ret;
1170 }
1171
1172 /**
1173  * reserve_bo_and_cond_vms - reserve a BO and some VMs conditionally
1174  * @mem: KFD BO structure.
1175  * @vm: the VM to reserve. If NULL, then all VMs associated with the BO
1176  * is used. Otherwise, a single VM associated with the BO.
1177  * @map_type: the mapping status that will be used to filter the VMs.
1178  * @ctx: the struct that will be used in unreserve_bo_and_vms().
1179  *
1180  * Returns 0 for success, negative for failure.
1181  */
1182 static int reserve_bo_and_cond_vms(struct kgd_mem *mem,
1183                                 struct amdgpu_vm *vm, enum bo_vm_match map_type,
1184                                 struct bo_vm_reservation_context *ctx)
1185 {
1186         struct kfd_mem_attachment *entry;
1187         struct amdgpu_bo *bo = mem->bo;
1188         int ret;
1189
1190         ctx->sync = &mem->sync;
1191         drm_exec_init(&ctx->exec, DRM_EXEC_INTERRUPTIBLE_WAIT, 0);
1192         drm_exec_until_all_locked(&ctx->exec) {
1193                 ctx->n_vms = 0;
1194                 list_for_each_entry(entry, &mem->attachments, list) {
1195                         if ((vm && vm != entry->bo_va->base.vm) ||
1196                                 (entry->is_mapped != map_type
1197                                 && map_type != BO_VM_ALL))
1198                                 continue;
1199
1200                         ret = amdgpu_vm_lock_pd(entry->bo_va->base.vm,
1201                                                 &ctx->exec, 2);
1202                         drm_exec_retry_on_contention(&ctx->exec);
1203                         if (unlikely(ret))
1204                                 goto error;
1205                         ++ctx->n_vms;
1206                 }
1207
1208                 ret = drm_exec_prepare_obj(&ctx->exec, &bo->tbo.base, 1);
1209                 drm_exec_retry_on_contention(&ctx->exec);
1210                 if (unlikely(ret))
1211                         goto error;
1212         }
1213         return 0;
1214
1215 error:
1216         pr_err("Failed to reserve buffers in ttm.\n");
1217         drm_exec_fini(&ctx->exec);
1218         return ret;
1219 }
1220
1221 /**
1222  * unreserve_bo_and_vms - Unreserve BO and VMs from a reservation context
1223  * @ctx: Reservation context to unreserve
1224  * @wait: Optionally wait for a sync object representing pending VM updates
1225  * @intr: Whether the wait is interruptible
1226  *
1227  * Also frees any resources allocated in
1228  * reserve_bo_and_(cond_)vm(s). Returns the status from
1229  * amdgpu_sync_wait.
1230  */
1231 static int unreserve_bo_and_vms(struct bo_vm_reservation_context *ctx,
1232                                  bool wait, bool intr)
1233 {
1234         int ret = 0;
1235
1236         if (wait)
1237                 ret = amdgpu_sync_wait(ctx->sync, intr);
1238
1239         drm_exec_fini(&ctx->exec);
1240         ctx->sync = NULL;
1241         return ret;
1242 }
1243
1244 static void unmap_bo_from_gpuvm(struct kgd_mem *mem,
1245                                 struct kfd_mem_attachment *entry,
1246                                 struct amdgpu_sync *sync)
1247 {
1248         struct amdgpu_bo_va *bo_va = entry->bo_va;
1249         struct amdgpu_device *adev = entry->adev;
1250         struct amdgpu_vm *vm = bo_va->base.vm;
1251
1252         amdgpu_vm_bo_unmap(adev, bo_va, entry->va);
1253
1254         amdgpu_vm_clear_freed(adev, vm, &bo_va->last_pt_update);
1255
1256         amdgpu_sync_fence(sync, bo_va->last_pt_update);
1257 }
1258
1259 static int update_gpuvm_pte(struct kgd_mem *mem,
1260                             struct kfd_mem_attachment *entry,
1261                             struct amdgpu_sync *sync)
1262 {
1263         struct amdgpu_bo_va *bo_va = entry->bo_va;
1264         struct amdgpu_device *adev = entry->adev;
1265         int ret;
1266
1267         ret = kfd_mem_dmamap_attachment(mem, entry);
1268         if (ret)
1269                 return ret;
1270
1271         /* Update the page tables  */
1272         ret = amdgpu_vm_bo_update(adev, bo_va, false);
1273         if (ret) {
1274                 pr_err("amdgpu_vm_bo_update failed\n");
1275                 return ret;
1276         }
1277
1278         return amdgpu_sync_fence(sync, bo_va->last_pt_update);
1279 }
1280
1281 static int map_bo_to_gpuvm(struct kgd_mem *mem,
1282                            struct kfd_mem_attachment *entry,
1283                            struct amdgpu_sync *sync,
1284                            bool no_update_pte)
1285 {
1286         int ret;
1287
1288         /* Set virtual address for the allocation */
1289         ret = amdgpu_vm_bo_map(entry->adev, entry->bo_va, entry->va, 0,
1290                                amdgpu_bo_size(entry->bo_va->base.bo),
1291                                entry->pte_flags);
1292         if (ret) {
1293                 pr_err("Failed to map VA 0x%llx in vm. ret %d\n",
1294                                 entry->va, ret);
1295                 return ret;
1296         }
1297
1298         if (no_update_pte)
1299                 return 0;
1300
1301         ret = update_gpuvm_pte(mem, entry, sync);
1302         if (ret) {
1303                 pr_err("update_gpuvm_pte() failed\n");
1304                 goto update_gpuvm_pte_failed;
1305         }
1306
1307         return 0;
1308
1309 update_gpuvm_pte_failed:
1310         unmap_bo_from_gpuvm(mem, entry, sync);
1311         kfd_mem_dmaunmap_attachment(mem, entry);
1312         return ret;
1313 }
1314
1315 static int process_validate_vms(struct amdkfd_process_info *process_info,
1316                                 struct ww_acquire_ctx *ticket)
1317 {
1318         struct amdgpu_vm *peer_vm;
1319         int ret;
1320
1321         list_for_each_entry(peer_vm, &process_info->vm_list_head,
1322                             vm_list_node) {
1323                 ret = vm_validate_pt_pd_bos(peer_vm, ticket);
1324                 if (ret)
1325                         return ret;
1326         }
1327
1328         return 0;
1329 }
1330
1331 static int process_sync_pds_resv(struct amdkfd_process_info *process_info,
1332                                  struct amdgpu_sync *sync)
1333 {
1334         struct amdgpu_vm *peer_vm;
1335         int ret;
1336
1337         list_for_each_entry(peer_vm, &process_info->vm_list_head,
1338                             vm_list_node) {
1339                 struct amdgpu_bo *pd = peer_vm->root.bo;
1340
1341                 ret = amdgpu_sync_resv(NULL, sync, pd->tbo.base.resv,
1342                                        AMDGPU_SYNC_NE_OWNER,
1343                                        AMDGPU_FENCE_OWNER_KFD);
1344                 if (ret)
1345                         return ret;
1346         }
1347
1348         return 0;
1349 }
1350
1351 static int process_update_pds(struct amdkfd_process_info *process_info,
1352                               struct amdgpu_sync *sync)
1353 {
1354         struct amdgpu_vm *peer_vm;
1355         int ret;
1356
1357         list_for_each_entry(peer_vm, &process_info->vm_list_head,
1358                             vm_list_node) {
1359                 ret = vm_update_pds(peer_vm, sync);
1360                 if (ret)
1361                         return ret;
1362         }
1363
1364         return 0;
1365 }
1366
1367 static int init_kfd_vm(struct amdgpu_vm *vm, void **process_info,
1368                        struct dma_fence **ef)
1369 {
1370         struct amdkfd_process_info *info = NULL;
1371         int ret;
1372
1373         if (!*process_info) {
1374                 info = kzalloc(sizeof(*info), GFP_KERNEL);
1375                 if (!info)
1376                         return -ENOMEM;
1377
1378                 mutex_init(&info->lock);
1379                 mutex_init(&info->notifier_lock);
1380                 INIT_LIST_HEAD(&info->vm_list_head);
1381                 INIT_LIST_HEAD(&info->kfd_bo_list);
1382                 INIT_LIST_HEAD(&info->userptr_valid_list);
1383                 INIT_LIST_HEAD(&info->userptr_inval_list);
1384
1385                 info->eviction_fence =
1386                         amdgpu_amdkfd_fence_create(dma_fence_context_alloc(1),
1387                                                    current->mm,
1388                                                    NULL);
1389                 if (!info->eviction_fence) {
1390                         pr_err("Failed to create eviction fence\n");
1391                         ret = -ENOMEM;
1392                         goto create_evict_fence_fail;
1393                 }
1394
1395                 info->pid = get_task_pid(current->group_leader, PIDTYPE_PID);
1396                 INIT_DELAYED_WORK(&info->restore_userptr_work,
1397                                   amdgpu_amdkfd_restore_userptr_worker);
1398
1399                 *process_info = info;
1400         }
1401
1402         vm->process_info = *process_info;
1403
1404         /* Validate page directory and attach eviction fence */
1405         ret = amdgpu_bo_reserve(vm->root.bo, true);
1406         if (ret)
1407                 goto reserve_pd_fail;
1408         ret = vm_validate_pt_pd_bos(vm, NULL);
1409         if (ret) {
1410                 pr_err("validate_pt_pd_bos() failed\n");
1411                 goto validate_pd_fail;
1412         }
1413         ret = amdgpu_bo_sync_wait(vm->root.bo,
1414                                   AMDGPU_FENCE_OWNER_KFD, false);
1415         if (ret)
1416                 goto wait_pd_fail;
1417         ret = dma_resv_reserve_fences(vm->root.bo->tbo.base.resv, 1);
1418         if (ret)
1419                 goto reserve_shared_fail;
1420         dma_resv_add_fence(vm->root.bo->tbo.base.resv,
1421                            &vm->process_info->eviction_fence->base,
1422                            DMA_RESV_USAGE_BOOKKEEP);
1423         amdgpu_bo_unreserve(vm->root.bo);
1424
1425         /* Update process info */
1426         mutex_lock(&vm->process_info->lock);
1427         list_add_tail(&vm->vm_list_node,
1428                         &(vm->process_info->vm_list_head));
1429         vm->process_info->n_vms++;
1430
1431         *ef = dma_fence_get(&vm->process_info->eviction_fence->base);
1432         mutex_unlock(&vm->process_info->lock);
1433
1434         return 0;
1435
1436 reserve_shared_fail:
1437 wait_pd_fail:
1438 validate_pd_fail:
1439         amdgpu_bo_unreserve(vm->root.bo);
1440 reserve_pd_fail:
1441         vm->process_info = NULL;
1442         if (info) {
1443                 dma_fence_put(&info->eviction_fence->base);
1444                 *process_info = NULL;
1445                 put_pid(info->pid);
1446 create_evict_fence_fail:
1447                 mutex_destroy(&info->lock);
1448                 mutex_destroy(&info->notifier_lock);
1449                 kfree(info);
1450         }
1451         return ret;
1452 }
1453
1454 /**
1455  * amdgpu_amdkfd_gpuvm_pin_bo() - Pins a BO using following criteria
1456  * @bo: Handle of buffer object being pinned
1457  * @domain: Domain into which BO should be pinned
1458  *
1459  *   - USERPTR BOs are UNPINNABLE and will return error
1460  *   - All other BO types (GTT, VRAM, MMIO and DOORBELL) will have their
1461  *     PIN count incremented. It is valid to PIN a BO multiple times
1462  *
1463  * Return: ZERO if successful in pinning, Non-Zero in case of error.
1464  */
1465 static int amdgpu_amdkfd_gpuvm_pin_bo(struct amdgpu_bo *bo, u32 domain)
1466 {
1467         int ret = 0;
1468
1469         ret = amdgpu_bo_reserve(bo, false);
1470         if (unlikely(ret))
1471                 return ret;
1472
1473         ret = amdgpu_bo_pin_restricted(bo, domain, 0, 0);
1474         if (ret)
1475                 pr_err("Error in Pinning BO to domain: %d\n", domain);
1476
1477         amdgpu_bo_sync_wait(bo, AMDGPU_FENCE_OWNER_KFD, false);
1478         amdgpu_bo_unreserve(bo);
1479
1480         return ret;
1481 }
1482
1483 /**
1484  * amdgpu_amdkfd_gpuvm_unpin_bo() - Unpins BO using following criteria
1485  * @bo: Handle of buffer object being unpinned
1486  *
1487  *   - Is a illegal request for USERPTR BOs and is ignored
1488  *   - All other BO types (GTT, VRAM, MMIO and DOORBELL) will have their
1489  *     PIN count decremented. Calls to UNPIN must balance calls to PIN
1490  */
1491 static void amdgpu_amdkfd_gpuvm_unpin_bo(struct amdgpu_bo *bo)
1492 {
1493         int ret = 0;
1494
1495         ret = amdgpu_bo_reserve(bo, false);
1496         if (unlikely(ret))
1497                 return;
1498
1499         amdgpu_bo_unpin(bo);
1500         amdgpu_bo_unreserve(bo);
1501 }
1502
1503 int amdgpu_amdkfd_gpuvm_set_vm_pasid(struct amdgpu_device *adev,
1504                                      struct amdgpu_vm *avm, u32 pasid)
1505
1506 {
1507         int ret;
1508
1509         /* Free the original amdgpu allocated pasid,
1510          * will be replaced with kfd allocated pasid.
1511          */
1512         if (avm->pasid) {
1513                 amdgpu_pasid_free(avm->pasid);
1514                 amdgpu_vm_set_pasid(adev, avm, 0);
1515         }
1516
1517         ret = amdgpu_vm_set_pasid(adev, avm, pasid);
1518         if (ret)
1519                 return ret;
1520
1521         return 0;
1522 }
1523
1524 int amdgpu_amdkfd_gpuvm_acquire_process_vm(struct amdgpu_device *adev,
1525                                            struct amdgpu_vm *avm,
1526                                            void **process_info,
1527                                            struct dma_fence **ef)
1528 {
1529         int ret;
1530
1531         /* Already a compute VM? */
1532         if (avm->process_info)
1533                 return -EINVAL;
1534
1535         /* Convert VM into a compute VM */
1536         ret = amdgpu_vm_make_compute(adev, avm);
1537         if (ret)
1538                 return ret;
1539
1540         /* Initialize KFD part of the VM and process info */
1541         ret = init_kfd_vm(avm, process_info, ef);
1542         if (ret)
1543                 return ret;
1544
1545         amdgpu_vm_set_task_info(avm);
1546
1547         return 0;
1548 }
1549
1550 void amdgpu_amdkfd_gpuvm_destroy_cb(struct amdgpu_device *adev,
1551                                     struct amdgpu_vm *vm)
1552 {
1553         struct amdkfd_process_info *process_info = vm->process_info;
1554
1555         if (!process_info)
1556                 return;
1557
1558         /* Update process info */
1559         mutex_lock(&process_info->lock);
1560         process_info->n_vms--;
1561         list_del(&vm->vm_list_node);
1562         mutex_unlock(&process_info->lock);
1563
1564         vm->process_info = NULL;
1565
1566         /* Release per-process resources when last compute VM is destroyed */
1567         if (!process_info->n_vms) {
1568                 WARN_ON(!list_empty(&process_info->kfd_bo_list));
1569                 WARN_ON(!list_empty(&process_info->userptr_valid_list));
1570                 WARN_ON(!list_empty(&process_info->userptr_inval_list));
1571
1572                 dma_fence_put(&process_info->eviction_fence->base);
1573                 cancel_delayed_work_sync(&process_info->restore_userptr_work);
1574                 put_pid(process_info->pid);
1575                 mutex_destroy(&process_info->lock);
1576                 mutex_destroy(&process_info->notifier_lock);
1577                 kfree(process_info);
1578         }
1579 }
1580
1581 void amdgpu_amdkfd_gpuvm_release_process_vm(struct amdgpu_device *adev,
1582                                             void *drm_priv)
1583 {
1584         struct amdgpu_vm *avm;
1585
1586         if (WARN_ON(!adev || !drm_priv))
1587                 return;
1588
1589         avm = drm_priv_to_vm(drm_priv);
1590
1591         pr_debug("Releasing process vm %p\n", avm);
1592
1593         /* The original pasid of amdgpu vm has already been
1594          * released during making a amdgpu vm to a compute vm
1595          * The current pasid is managed by kfd and will be
1596          * released on kfd process destroy. Set amdgpu pasid
1597          * to 0 to avoid duplicate release.
1598          */
1599         amdgpu_vm_release_compute(adev, avm);
1600 }
1601
1602 uint64_t amdgpu_amdkfd_gpuvm_get_process_page_dir(void *drm_priv)
1603 {
1604         struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
1605         struct amdgpu_bo *pd = avm->root.bo;
1606         struct amdgpu_device *adev = amdgpu_ttm_adev(pd->tbo.bdev);
1607
1608         if (adev->asic_type < CHIP_VEGA10)
1609                 return avm->pd_phys_addr >> AMDGPU_GPU_PAGE_SHIFT;
1610         return avm->pd_phys_addr;
1611 }
1612
1613 void amdgpu_amdkfd_block_mmu_notifications(void *p)
1614 {
1615         struct amdkfd_process_info *pinfo = (struct amdkfd_process_info *)p;
1616
1617         mutex_lock(&pinfo->lock);
1618         WRITE_ONCE(pinfo->block_mmu_notifications, true);
1619         mutex_unlock(&pinfo->lock);
1620 }
1621
1622 int amdgpu_amdkfd_criu_resume(void *p)
1623 {
1624         int ret = 0;
1625         struct amdkfd_process_info *pinfo = (struct amdkfd_process_info *)p;
1626
1627         mutex_lock(&pinfo->lock);
1628         pr_debug("scheduling work\n");
1629         mutex_lock(&pinfo->notifier_lock);
1630         pinfo->evicted_bos++;
1631         mutex_unlock(&pinfo->notifier_lock);
1632         if (!READ_ONCE(pinfo->block_mmu_notifications)) {
1633                 ret = -EINVAL;
1634                 goto out_unlock;
1635         }
1636         WRITE_ONCE(pinfo->block_mmu_notifications, false);
1637         queue_delayed_work(system_freezable_wq,
1638                            &pinfo->restore_userptr_work, 0);
1639
1640 out_unlock:
1641         mutex_unlock(&pinfo->lock);
1642         return ret;
1643 }
1644
1645 size_t amdgpu_amdkfd_get_available_memory(struct amdgpu_device *adev,
1646                                           uint8_t xcp_id)
1647 {
1648         uint64_t reserved_for_pt =
1649                 ESTIMATE_PT_SIZE(amdgpu_amdkfd_total_mem_size);
1650         ssize_t available;
1651         uint64_t vram_available, system_mem_available, ttm_mem_available;
1652
1653         spin_lock(&kfd_mem_limit.mem_limit_lock);
1654         vram_available = KFD_XCP_MEMORY_SIZE(adev, xcp_id)
1655                 - adev->kfd.vram_used_aligned[xcp_id]
1656                 - atomic64_read(&adev->vram_pin_size)
1657                 - reserved_for_pt;
1658
1659         if (adev->gmc.is_app_apu) {
1660                 system_mem_available = no_system_mem_limit ?
1661                                         kfd_mem_limit.max_system_mem_limit :
1662                                         kfd_mem_limit.max_system_mem_limit -
1663                                         kfd_mem_limit.system_mem_used;
1664
1665                 ttm_mem_available = kfd_mem_limit.max_ttm_mem_limit -
1666                                 kfd_mem_limit.ttm_mem_used;
1667
1668                 available = min3(system_mem_available, ttm_mem_available,
1669                                  vram_available);
1670                 available = ALIGN_DOWN(available, PAGE_SIZE);
1671         } else {
1672                 available = ALIGN_DOWN(vram_available, VRAM_AVAILABLITY_ALIGN);
1673         }
1674
1675         spin_unlock(&kfd_mem_limit.mem_limit_lock);
1676
1677         if (available < 0)
1678                 available = 0;
1679
1680         return available;
1681 }
1682
1683 int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
1684                 struct amdgpu_device *adev, uint64_t va, uint64_t size,
1685                 void *drm_priv, struct kgd_mem **mem,
1686                 uint64_t *offset, uint32_t flags, bool criu_resume)
1687 {
1688         struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
1689         struct amdgpu_fpriv *fpriv = container_of(avm, struct amdgpu_fpriv, vm);
1690         enum ttm_bo_type bo_type = ttm_bo_type_device;
1691         struct sg_table *sg = NULL;
1692         uint64_t user_addr = 0;
1693         struct amdgpu_bo *bo;
1694         struct drm_gem_object *gobj = NULL;
1695         u32 domain, alloc_domain;
1696         uint64_t aligned_size;
1697         int8_t xcp_id = -1;
1698         u64 alloc_flags;
1699         int ret;
1700
1701         /*
1702          * Check on which domain to allocate BO
1703          */
1704         if (flags & KFD_IOC_ALLOC_MEM_FLAGS_VRAM) {
1705                 domain = alloc_domain = AMDGPU_GEM_DOMAIN_VRAM;
1706
1707                 if (adev->gmc.is_app_apu) {
1708                         domain = AMDGPU_GEM_DOMAIN_GTT;
1709                         alloc_domain = AMDGPU_GEM_DOMAIN_GTT;
1710                         alloc_flags = 0;
1711                 } else {
1712                         alloc_flags = AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE;
1713                         alloc_flags |= (flags & KFD_IOC_ALLOC_MEM_FLAGS_PUBLIC) ?
1714                         AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED : 0;
1715                 }
1716                 xcp_id = fpriv->xcp_id == AMDGPU_XCP_NO_PARTITION ?
1717                                         0 : fpriv->xcp_id;
1718         } else if (flags & KFD_IOC_ALLOC_MEM_FLAGS_GTT) {
1719                 domain = alloc_domain = AMDGPU_GEM_DOMAIN_GTT;
1720                 alloc_flags = 0;
1721         } else {
1722                 domain = AMDGPU_GEM_DOMAIN_GTT;
1723                 alloc_domain = AMDGPU_GEM_DOMAIN_CPU;
1724                 alloc_flags = AMDGPU_GEM_CREATE_PREEMPTIBLE;
1725
1726                 if (flags & KFD_IOC_ALLOC_MEM_FLAGS_USERPTR) {
1727                         if (!offset || !*offset)
1728                                 return -EINVAL;
1729                         user_addr = untagged_addr(*offset);
1730                 } else if (flags & (KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL |
1731                                     KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP)) {
1732                         bo_type = ttm_bo_type_sg;
1733                         if (size > UINT_MAX)
1734                                 return -EINVAL;
1735                         sg = create_sg_table(*offset, size);
1736                         if (!sg)
1737                                 return -ENOMEM;
1738                 } else {
1739                         return -EINVAL;
1740                 }
1741         }
1742
1743         if (flags & KFD_IOC_ALLOC_MEM_FLAGS_COHERENT)
1744                 alloc_flags |= AMDGPU_GEM_CREATE_COHERENT;
1745         if (flags & KFD_IOC_ALLOC_MEM_FLAGS_EXT_COHERENT)
1746                 alloc_flags |= AMDGPU_GEM_CREATE_EXT_COHERENT;
1747         if (flags & KFD_IOC_ALLOC_MEM_FLAGS_UNCACHED)
1748                 alloc_flags |= AMDGPU_GEM_CREATE_UNCACHED;
1749
1750         *mem = kzalloc(sizeof(struct kgd_mem), GFP_KERNEL);
1751         if (!*mem) {
1752                 ret = -ENOMEM;
1753                 goto err;
1754         }
1755         INIT_LIST_HEAD(&(*mem)->attachments);
1756         mutex_init(&(*mem)->lock);
1757         (*mem)->aql_queue = !!(flags & KFD_IOC_ALLOC_MEM_FLAGS_AQL_QUEUE_MEM);
1758
1759         /* Workaround for AQL queue wraparound bug. Map the same
1760          * memory twice. That means we only actually allocate half
1761          * the memory.
1762          */
1763         if ((*mem)->aql_queue)
1764                 size >>= 1;
1765         aligned_size = PAGE_ALIGN(size);
1766
1767         (*mem)->alloc_flags = flags;
1768
1769         amdgpu_sync_create(&(*mem)->sync);
1770
1771         ret = amdgpu_amdkfd_reserve_mem_limit(adev, aligned_size, flags,
1772                                               xcp_id);
1773         if (ret) {
1774                 pr_debug("Insufficient memory\n");
1775                 goto err_reserve_limit;
1776         }
1777
1778         pr_debug("\tcreate BO VA 0x%llx size 0x%llx domain %s xcp_id %d\n",
1779                  va, (*mem)->aql_queue ? size << 1 : size,
1780                  domain_string(alloc_domain), xcp_id);
1781
1782         ret = amdgpu_gem_object_create(adev, aligned_size, 1, alloc_domain, alloc_flags,
1783                                        bo_type, NULL, &gobj, xcp_id + 1);
1784         if (ret) {
1785                 pr_debug("Failed to create BO on domain %s. ret %d\n",
1786                          domain_string(alloc_domain), ret);
1787                 goto err_bo_create;
1788         }
1789         ret = drm_vma_node_allow(&gobj->vma_node, drm_priv);
1790         if (ret) {
1791                 pr_debug("Failed to allow vma node access. ret %d\n", ret);
1792                 goto err_node_allow;
1793         }
1794         ret = drm_gem_handle_create(adev->kfd.client.file, gobj, &(*mem)->gem_handle);
1795         if (ret)
1796                 goto err_gem_handle_create;
1797         bo = gem_to_amdgpu_bo(gobj);
1798         if (bo_type == ttm_bo_type_sg) {
1799                 bo->tbo.sg = sg;
1800                 bo->tbo.ttm->sg = sg;
1801         }
1802         bo->kfd_bo = *mem;
1803         (*mem)->bo = bo;
1804         if (user_addr)
1805                 bo->flags |= AMDGPU_AMDKFD_CREATE_USERPTR_BO;
1806
1807         (*mem)->va = va;
1808         (*mem)->domain = domain;
1809         (*mem)->mapped_to_gpu_memory = 0;
1810         (*mem)->process_info = avm->process_info;
1811
1812         add_kgd_mem_to_kfd_bo_list(*mem, avm->process_info, user_addr);
1813
1814         if (user_addr) {
1815                 pr_debug("creating userptr BO for user_addr = %llx\n", user_addr);
1816                 ret = init_user_pages(*mem, user_addr, criu_resume);
1817                 if (ret)
1818                         goto allocate_init_user_pages_failed;
1819         } else  if (flags & (KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL |
1820                                 KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP)) {
1821                 ret = amdgpu_amdkfd_gpuvm_pin_bo(bo, AMDGPU_GEM_DOMAIN_GTT);
1822                 if (ret) {
1823                         pr_err("Pinning MMIO/DOORBELL BO during ALLOC FAILED\n");
1824                         goto err_pin_bo;
1825                 }
1826                 bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
1827                 bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
1828         } else {
1829                 mutex_lock(&avm->process_info->lock);
1830                 if (avm->process_info->eviction_fence &&
1831                     !dma_fence_is_signaled(&avm->process_info->eviction_fence->base))
1832                         ret = amdgpu_amdkfd_bo_validate_and_fence(bo, domain,
1833                                 &avm->process_info->eviction_fence->base);
1834                 mutex_unlock(&avm->process_info->lock);
1835                 if (ret)
1836                         goto err_validate_bo;
1837         }
1838
1839         if (offset)
1840                 *offset = amdgpu_bo_mmap_offset(bo);
1841
1842         return 0;
1843
1844 allocate_init_user_pages_failed:
1845 err_pin_bo:
1846 err_validate_bo:
1847         remove_kgd_mem_from_kfd_bo_list(*mem, avm->process_info);
1848         drm_gem_handle_delete(adev->kfd.client.file, (*mem)->gem_handle);
1849 err_gem_handle_create:
1850         drm_vma_node_revoke(&gobj->vma_node, drm_priv);
1851 err_node_allow:
1852         /* Don't unreserve system mem limit twice */
1853         goto err_reserve_limit;
1854 err_bo_create:
1855         amdgpu_amdkfd_unreserve_mem_limit(adev, aligned_size, flags, xcp_id);
1856 err_reserve_limit:
1857         mutex_destroy(&(*mem)->lock);
1858         if (gobj)
1859                 drm_gem_object_put(gobj);
1860         else
1861                 kfree(*mem);
1862 err:
1863         if (sg) {
1864                 sg_free_table(sg);
1865                 kfree(sg);
1866         }
1867         return ret;
1868 }
1869
1870 int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
1871                 struct amdgpu_device *adev, struct kgd_mem *mem, void *drm_priv,
1872                 uint64_t *size)
1873 {
1874         struct amdkfd_process_info *process_info = mem->process_info;
1875         unsigned long bo_size = mem->bo->tbo.base.size;
1876         bool use_release_notifier = (mem->bo->kfd_bo == mem);
1877         struct kfd_mem_attachment *entry, *tmp;
1878         struct bo_vm_reservation_context ctx;
1879         unsigned int mapped_to_gpu_memory;
1880         int ret;
1881         bool is_imported = false;
1882
1883         mutex_lock(&mem->lock);
1884
1885         /* Unpin MMIO/DOORBELL BO's that were pinned during allocation */
1886         if (mem->alloc_flags &
1887             (KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL |
1888              KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP)) {
1889                 amdgpu_amdkfd_gpuvm_unpin_bo(mem->bo);
1890         }
1891
1892         mapped_to_gpu_memory = mem->mapped_to_gpu_memory;
1893         is_imported = mem->is_imported;
1894         mutex_unlock(&mem->lock);
1895         /* lock is not needed after this, since mem is unused and will
1896          * be freed anyway
1897          */
1898
1899         if (mapped_to_gpu_memory > 0) {
1900                 pr_debug("BO VA 0x%llx size 0x%lx is still mapped.\n",
1901                                 mem->va, bo_size);
1902                 return -EBUSY;
1903         }
1904
1905         /* Make sure restore workers don't access the BO any more */
1906         mutex_lock(&process_info->lock);
1907         list_del(&mem->validate_list);
1908         mutex_unlock(&process_info->lock);
1909
1910         /* Cleanup user pages and MMU notifiers */
1911         if (amdgpu_ttm_tt_get_usermm(mem->bo->tbo.ttm)) {
1912                 amdgpu_hmm_unregister(mem->bo);
1913                 mutex_lock(&process_info->notifier_lock);
1914                 amdgpu_ttm_tt_discard_user_pages(mem->bo->tbo.ttm, mem->range);
1915                 mutex_unlock(&process_info->notifier_lock);
1916         }
1917
1918         ret = reserve_bo_and_cond_vms(mem, NULL, BO_VM_ALL, &ctx);
1919         if (unlikely(ret))
1920                 return ret;
1921
1922         amdgpu_amdkfd_remove_eviction_fence(mem->bo,
1923                                         process_info->eviction_fence);
1924         pr_debug("Release VA 0x%llx - 0x%llx\n", mem->va,
1925                 mem->va + bo_size * (1 + mem->aql_queue));
1926
1927         /* Remove from VM internal data structures */
1928         list_for_each_entry_safe(entry, tmp, &mem->attachments, list) {
1929                 kfd_mem_dmaunmap_attachment(mem, entry);
1930                 kfd_mem_detach(entry);
1931         }
1932
1933         ret = unreserve_bo_and_vms(&ctx, false, false);
1934
1935         /* Free the sync object */
1936         amdgpu_sync_free(&mem->sync);
1937
1938         /* If the SG is not NULL, it's one we created for a doorbell or mmio
1939          * remap BO. We need to free it.
1940          */
1941         if (mem->bo->tbo.sg) {
1942                 sg_free_table(mem->bo->tbo.sg);
1943                 kfree(mem->bo->tbo.sg);
1944         }
1945
1946         /* Update the size of the BO being freed if it was allocated from
1947          * VRAM and is not imported. For APP APU VRAM allocations are done
1948          * in GTT domain
1949          */
1950         if (size) {
1951                 if (!is_imported &&
1952                    (mem->bo->preferred_domains == AMDGPU_GEM_DOMAIN_VRAM ||
1953                    (adev->gmc.is_app_apu &&
1954                     mem->bo->preferred_domains == AMDGPU_GEM_DOMAIN_GTT)))
1955                         *size = bo_size;
1956                 else
1957                         *size = 0;
1958         }
1959
1960         /* Free the BO*/
1961         drm_vma_node_revoke(&mem->bo->tbo.base.vma_node, drm_priv);
1962         drm_gem_handle_delete(adev->kfd.client.file, mem->gem_handle);
1963         if (mem->dmabuf) {
1964                 dma_buf_put(mem->dmabuf);
1965                 mem->dmabuf = NULL;
1966         }
1967         mutex_destroy(&mem->lock);
1968
1969         /* If this releases the last reference, it will end up calling
1970          * amdgpu_amdkfd_release_notify and kfree the mem struct. That's why
1971          * this needs to be the last call here.
1972          */
1973         drm_gem_object_put(&mem->bo->tbo.base);
1974
1975         /*
1976          * For kgd_mem allocated in amdgpu_amdkfd_gpuvm_import_dmabuf(),
1977          * explicitly free it here.
1978          */
1979         if (!use_release_notifier)
1980                 kfree(mem);
1981
1982         return ret;
1983 }
1984
1985 int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
1986                 struct amdgpu_device *adev, struct kgd_mem *mem,
1987                 void *drm_priv)
1988 {
1989         struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
1990         int ret;
1991         struct amdgpu_bo *bo;
1992         uint32_t domain;
1993         struct kfd_mem_attachment *entry;
1994         struct bo_vm_reservation_context ctx;
1995         unsigned long bo_size;
1996         bool is_invalid_userptr = false;
1997
1998         bo = mem->bo;
1999         if (!bo) {
2000                 pr_err("Invalid BO when mapping memory to GPU\n");
2001                 return -EINVAL;
2002         }
2003
2004         /* Make sure restore is not running concurrently. Since we
2005          * don't map invalid userptr BOs, we rely on the next restore
2006          * worker to do the mapping
2007          */
2008         mutex_lock(&mem->process_info->lock);
2009
2010         /* Lock notifier lock. If we find an invalid userptr BO, we can be
2011          * sure that the MMU notifier is no longer running
2012          * concurrently and the queues are actually stopped
2013          */
2014         if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm)) {
2015                 mutex_lock(&mem->process_info->notifier_lock);
2016                 is_invalid_userptr = !!mem->invalid;
2017                 mutex_unlock(&mem->process_info->notifier_lock);
2018         }
2019
2020         mutex_lock(&mem->lock);
2021
2022         domain = mem->domain;
2023         bo_size = bo->tbo.base.size;
2024
2025         pr_debug("Map VA 0x%llx - 0x%llx to vm %p domain %s\n",
2026                         mem->va,
2027                         mem->va + bo_size * (1 + mem->aql_queue),
2028                         avm, domain_string(domain));
2029
2030         if (!kfd_mem_is_attached(avm, mem)) {
2031                 ret = kfd_mem_attach(adev, mem, avm, mem->aql_queue);
2032                 if (ret)
2033                         goto out;
2034         }
2035
2036         ret = reserve_bo_and_vm(mem, avm, &ctx);
2037         if (unlikely(ret))
2038                 goto out;
2039
2040         /* Userptr can be marked as "not invalid", but not actually be
2041          * validated yet (still in the system domain). In that case
2042          * the queues are still stopped and we can leave mapping for
2043          * the next restore worker
2044          */
2045         if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) &&
2046             bo->tbo.resource->mem_type == TTM_PL_SYSTEM)
2047                 is_invalid_userptr = true;
2048
2049         ret = vm_validate_pt_pd_bos(avm, NULL);
2050         if (unlikely(ret))
2051                 goto out_unreserve;
2052
2053         list_for_each_entry(entry, &mem->attachments, list) {
2054                 if (entry->bo_va->base.vm != avm || entry->is_mapped)
2055                         continue;
2056
2057                 pr_debug("\t map VA 0x%llx - 0x%llx in entry %p\n",
2058                          entry->va, entry->va + bo_size, entry);
2059
2060                 ret = map_bo_to_gpuvm(mem, entry, ctx.sync,
2061                                       is_invalid_userptr);
2062                 if (ret) {
2063                         pr_err("Failed to map bo to gpuvm\n");
2064                         goto out_unreserve;
2065                 }
2066
2067                 ret = vm_update_pds(avm, ctx.sync);
2068                 if (ret) {
2069                         pr_err("Failed to update page directories\n");
2070                         goto out_unreserve;
2071                 }
2072
2073                 entry->is_mapped = true;
2074                 mem->mapped_to_gpu_memory++;
2075                 pr_debug("\t INC mapping count %d\n",
2076                          mem->mapped_to_gpu_memory);
2077         }
2078
2079         ret = unreserve_bo_and_vms(&ctx, false, false);
2080
2081         goto out;
2082
2083 out_unreserve:
2084         unreserve_bo_and_vms(&ctx, false, false);
2085 out:
2086         mutex_unlock(&mem->process_info->lock);
2087         mutex_unlock(&mem->lock);
2088         return ret;
2089 }
2090
2091 int amdgpu_amdkfd_gpuvm_dmaunmap_mem(struct kgd_mem *mem, void *drm_priv)
2092 {
2093         struct kfd_mem_attachment *entry;
2094         struct amdgpu_vm *vm;
2095         int ret;
2096
2097         vm = drm_priv_to_vm(drm_priv);
2098
2099         mutex_lock(&mem->lock);
2100
2101         ret = amdgpu_bo_reserve(mem->bo, true);
2102         if (ret)
2103                 goto out;
2104
2105         list_for_each_entry(entry, &mem->attachments, list) {
2106                 if (entry->bo_va->base.vm != vm)
2107                         continue;
2108                 if (entry->bo_va->base.bo->tbo.ttm &&
2109                     !entry->bo_va->base.bo->tbo.ttm->sg)
2110                         continue;
2111
2112                 kfd_mem_dmaunmap_attachment(mem, entry);
2113         }
2114
2115         amdgpu_bo_unreserve(mem->bo);
2116 out:
2117         mutex_unlock(&mem->lock);
2118
2119         return ret;
2120 }
2121
2122 int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
2123                 struct amdgpu_device *adev, struct kgd_mem *mem, void *drm_priv)
2124 {
2125         struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
2126         unsigned long bo_size = mem->bo->tbo.base.size;
2127         struct kfd_mem_attachment *entry;
2128         struct bo_vm_reservation_context ctx;
2129         int ret;
2130
2131         mutex_lock(&mem->lock);
2132
2133         ret = reserve_bo_and_cond_vms(mem, avm, BO_VM_MAPPED, &ctx);
2134         if (unlikely(ret))
2135                 goto out;
2136         /* If no VMs were reserved, it means the BO wasn't actually mapped */
2137         if (ctx.n_vms == 0) {
2138                 ret = -EINVAL;
2139                 goto unreserve_out;
2140         }
2141
2142         ret = vm_validate_pt_pd_bos(avm, NULL);
2143         if (unlikely(ret))
2144                 goto unreserve_out;
2145
2146         pr_debug("Unmap VA 0x%llx - 0x%llx from vm %p\n",
2147                 mem->va,
2148                 mem->va + bo_size * (1 + mem->aql_queue),
2149                 avm);
2150
2151         list_for_each_entry(entry, &mem->attachments, list) {
2152                 if (entry->bo_va->base.vm != avm || !entry->is_mapped)
2153                         continue;
2154
2155                 pr_debug("\t unmap VA 0x%llx - 0x%llx from entry %p\n",
2156                          entry->va, entry->va + bo_size, entry);
2157
2158                 unmap_bo_from_gpuvm(mem, entry, ctx.sync);
2159                 entry->is_mapped = false;
2160
2161                 mem->mapped_to_gpu_memory--;
2162                 pr_debug("\t DEC mapping count %d\n",
2163                          mem->mapped_to_gpu_memory);
2164         }
2165
2166 unreserve_out:
2167         unreserve_bo_and_vms(&ctx, false, false);
2168 out:
2169         mutex_unlock(&mem->lock);
2170         return ret;
2171 }
2172
2173 int amdgpu_amdkfd_gpuvm_sync_memory(
2174                 struct amdgpu_device *adev, struct kgd_mem *mem, bool intr)
2175 {
2176         struct amdgpu_sync sync;
2177         int ret;
2178
2179         amdgpu_sync_create(&sync);
2180
2181         mutex_lock(&mem->lock);
2182         amdgpu_sync_clone(&mem->sync, &sync);
2183         mutex_unlock(&mem->lock);
2184
2185         ret = amdgpu_sync_wait(&sync, intr);
2186         amdgpu_sync_free(&sync);
2187         return ret;
2188 }
2189
2190 /**
2191  * amdgpu_amdkfd_map_gtt_bo_to_gart - Map BO to GART and increment reference count
2192  * @bo: Buffer object to be mapped
2193  *
2194  * Before return, bo reference count is incremented. To release the reference and unpin/
2195  * unmap the BO, call amdgpu_amdkfd_free_gtt_mem.
2196  */
2197 int amdgpu_amdkfd_map_gtt_bo_to_gart(struct amdgpu_bo *bo)
2198 {
2199         int ret;
2200
2201         ret = amdgpu_bo_reserve(bo, true);
2202         if (ret) {
2203                 pr_err("Failed to reserve bo. ret %d\n", ret);
2204                 goto err_reserve_bo_failed;
2205         }
2206
2207         ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
2208         if (ret) {
2209                 pr_err("Failed to pin bo. ret %d\n", ret);
2210                 goto err_pin_bo_failed;
2211         }
2212
2213         ret = amdgpu_ttm_alloc_gart(&bo->tbo);
2214         if (ret) {
2215                 pr_err("Failed to bind bo to GART. ret %d\n", ret);
2216                 goto err_map_bo_gart_failed;
2217         }
2218
2219         amdgpu_amdkfd_remove_eviction_fence(
2220                 bo, bo->vm_bo->vm->process_info->eviction_fence);
2221
2222         amdgpu_bo_unreserve(bo);
2223
2224         bo = amdgpu_bo_ref(bo);
2225
2226         return 0;
2227
2228 err_map_bo_gart_failed:
2229         amdgpu_bo_unpin(bo);
2230 err_pin_bo_failed:
2231         amdgpu_bo_unreserve(bo);
2232 err_reserve_bo_failed:
2233
2234         return ret;
2235 }
2236
2237 /** amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel() - Map a GTT BO for kernel CPU access
2238  *
2239  * @mem: Buffer object to be mapped for CPU access
2240  * @kptr[out]: pointer in kernel CPU address space
2241  * @size[out]: size of the buffer
2242  *
2243  * Pins the BO and maps it for kernel CPU access. The eviction fence is removed
2244  * from the BO, since pinned BOs cannot be evicted. The bo must remain on the
2245  * validate_list, so the GPU mapping can be restored after a page table was
2246  * evicted.
2247  *
2248  * Return: 0 on success, error code on failure
2249  */
2250 int amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(struct kgd_mem *mem,
2251                                              void **kptr, uint64_t *size)
2252 {
2253         int ret;
2254         struct amdgpu_bo *bo = mem->bo;
2255
2256         if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm)) {
2257                 pr_err("userptr can't be mapped to kernel\n");
2258                 return -EINVAL;
2259         }
2260
2261         mutex_lock(&mem->process_info->lock);
2262
2263         ret = amdgpu_bo_reserve(bo, true);
2264         if (ret) {
2265                 pr_err("Failed to reserve bo. ret %d\n", ret);
2266                 goto bo_reserve_failed;
2267         }
2268
2269         ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
2270         if (ret) {
2271                 pr_err("Failed to pin bo. ret %d\n", ret);
2272                 goto pin_failed;
2273         }
2274
2275         ret = amdgpu_bo_kmap(bo, kptr);
2276         if (ret) {
2277                 pr_err("Failed to map bo to kernel. ret %d\n", ret);
2278                 goto kmap_failed;
2279         }
2280
2281         amdgpu_amdkfd_remove_eviction_fence(
2282                 bo, mem->process_info->eviction_fence);
2283
2284         if (size)
2285                 *size = amdgpu_bo_size(bo);
2286
2287         amdgpu_bo_unreserve(bo);
2288
2289         mutex_unlock(&mem->process_info->lock);
2290         return 0;
2291
2292 kmap_failed:
2293         amdgpu_bo_unpin(bo);
2294 pin_failed:
2295         amdgpu_bo_unreserve(bo);
2296 bo_reserve_failed:
2297         mutex_unlock(&mem->process_info->lock);
2298
2299         return ret;
2300 }
2301
2302 /** amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel() - Unmap a GTT BO for kernel CPU access
2303  *
2304  * @mem: Buffer object to be unmapped for CPU access
2305  *
2306  * Removes the kernel CPU mapping and unpins the BO. It does not restore the
2307  * eviction fence, so this function should only be used for cleanup before the
2308  * BO is destroyed.
2309  */
2310 void amdgpu_amdkfd_gpuvm_unmap_gtt_bo_from_kernel(struct kgd_mem *mem)
2311 {
2312         struct amdgpu_bo *bo = mem->bo;
2313
2314         amdgpu_bo_reserve(bo, true);
2315         amdgpu_bo_kunmap(bo);
2316         amdgpu_bo_unpin(bo);
2317         amdgpu_bo_unreserve(bo);
2318 }
2319
2320 int amdgpu_amdkfd_gpuvm_get_vm_fault_info(struct amdgpu_device *adev,
2321                                           struct kfd_vm_fault_info *mem)
2322 {
2323         if (atomic_read(&adev->gmc.vm_fault_info_updated) == 1) {
2324                 *mem = *adev->gmc.vm_fault_info;
2325                 mb(); /* make sure read happened */
2326                 atomic_set(&adev->gmc.vm_fault_info_updated, 0);
2327         }
2328         return 0;
2329 }
2330
2331 static int import_obj_create(struct amdgpu_device *adev,
2332                              struct dma_buf *dma_buf,
2333                              struct drm_gem_object *obj,
2334                              uint64_t va, void *drm_priv,
2335                              struct kgd_mem **mem, uint64_t *size,
2336                              uint64_t *mmap_offset)
2337 {
2338         struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
2339         struct amdgpu_bo *bo;
2340         int ret;
2341
2342         bo = gem_to_amdgpu_bo(obj);
2343         if (!(bo->preferred_domains & (AMDGPU_GEM_DOMAIN_VRAM |
2344                                     AMDGPU_GEM_DOMAIN_GTT)))
2345                 /* Only VRAM and GTT BOs are supported */
2346                 return -EINVAL;
2347
2348         *mem = kzalloc(sizeof(struct kgd_mem), GFP_KERNEL);
2349         if (!*mem)
2350                 return -ENOMEM;
2351
2352         ret = drm_vma_node_allow(&obj->vma_node, drm_priv);
2353         if (ret)
2354                 goto err_free_mem;
2355
2356         if (size)
2357                 *size = amdgpu_bo_size(bo);
2358
2359         if (mmap_offset)
2360                 *mmap_offset = amdgpu_bo_mmap_offset(bo);
2361
2362         INIT_LIST_HEAD(&(*mem)->attachments);
2363         mutex_init(&(*mem)->lock);
2364
2365         (*mem)->alloc_flags =
2366                 ((bo->preferred_domains & AMDGPU_GEM_DOMAIN_VRAM) ?
2367                 KFD_IOC_ALLOC_MEM_FLAGS_VRAM : KFD_IOC_ALLOC_MEM_FLAGS_GTT)
2368                 | KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE
2369                 | KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE;
2370
2371         get_dma_buf(dma_buf);
2372         (*mem)->dmabuf = dma_buf;
2373         (*mem)->bo = bo;
2374         (*mem)->va = va;
2375         (*mem)->domain = (bo->preferred_domains & AMDGPU_GEM_DOMAIN_VRAM) && !adev->gmc.is_app_apu ?
2376                 AMDGPU_GEM_DOMAIN_VRAM : AMDGPU_GEM_DOMAIN_GTT;
2377
2378         (*mem)->mapped_to_gpu_memory = 0;
2379         (*mem)->process_info = avm->process_info;
2380         add_kgd_mem_to_kfd_bo_list(*mem, avm->process_info, false);
2381         amdgpu_sync_create(&(*mem)->sync);
2382         (*mem)->is_imported = true;
2383
2384         mutex_lock(&avm->process_info->lock);
2385         if (avm->process_info->eviction_fence &&
2386             !dma_fence_is_signaled(&avm->process_info->eviction_fence->base))
2387                 ret = amdgpu_amdkfd_bo_validate_and_fence(bo, (*mem)->domain,
2388                                 &avm->process_info->eviction_fence->base);
2389         mutex_unlock(&avm->process_info->lock);
2390         if (ret)
2391                 goto err_remove_mem;
2392
2393         return 0;
2394
2395 err_remove_mem:
2396         remove_kgd_mem_from_kfd_bo_list(*mem, avm->process_info);
2397         drm_vma_node_revoke(&obj->vma_node, drm_priv);
2398 err_free_mem:
2399         kfree(*mem);
2400         return ret;
2401 }
2402
2403 int amdgpu_amdkfd_gpuvm_import_dmabuf_fd(struct amdgpu_device *adev, int fd,
2404                                          uint64_t va, void *drm_priv,
2405                                          struct kgd_mem **mem, uint64_t *size,
2406                                          uint64_t *mmap_offset)
2407 {
2408         struct drm_gem_object *obj;
2409         uint32_t handle;
2410         int ret;
2411
2412         ret = drm_gem_prime_fd_to_handle(&adev->ddev, adev->kfd.client.file, fd,
2413                                          &handle);
2414         if (ret)
2415                 return ret;
2416         obj = drm_gem_object_lookup(adev->kfd.client.file, handle);
2417         if (!obj) {
2418                 ret = -EINVAL;
2419                 goto err_release_handle;
2420         }
2421
2422         ret = import_obj_create(adev, obj->dma_buf, obj, va, drm_priv, mem, size,
2423                                 mmap_offset);
2424         if (ret)
2425                 goto err_put_obj;
2426
2427         (*mem)->gem_handle = handle;
2428
2429         return 0;
2430
2431 err_put_obj:
2432         drm_gem_object_put(obj);
2433 err_release_handle:
2434         drm_gem_handle_delete(adev->kfd.client.file, handle);
2435         return ret;
2436 }
2437
2438 int amdgpu_amdkfd_gpuvm_export_dmabuf(struct kgd_mem *mem,
2439                                       struct dma_buf **dma_buf)
2440 {
2441         int ret;
2442
2443         mutex_lock(&mem->lock);
2444         ret = kfd_mem_export_dmabuf(mem);
2445         if (ret)
2446                 goto out;
2447
2448         get_dma_buf(mem->dmabuf);
2449         *dma_buf = mem->dmabuf;
2450 out:
2451         mutex_unlock(&mem->lock);
2452         return ret;
2453 }
2454
2455 /* Evict a userptr BO by stopping the queues if necessary
2456  *
2457  * Runs in MMU notifier, may be in RECLAIM_FS context. This means it
2458  * cannot do any memory allocations, and cannot take any locks that
2459  * are held elsewhere while allocating memory.
2460  *
2461  * It doesn't do anything to the BO itself. The real work happens in
2462  * restore, where we get updated page addresses. This function only
2463  * ensures that GPU access to the BO is stopped.
2464  */
2465 int amdgpu_amdkfd_evict_userptr(struct mmu_interval_notifier *mni,
2466                                 unsigned long cur_seq, struct kgd_mem *mem)
2467 {
2468         struct amdkfd_process_info *process_info = mem->process_info;
2469         int r = 0;
2470
2471         /* Do not process MMU notifications during CRIU restore until
2472          * KFD_CRIU_OP_RESUME IOCTL is received
2473          */
2474         if (READ_ONCE(process_info->block_mmu_notifications))
2475                 return 0;
2476
2477         mutex_lock(&process_info->notifier_lock);
2478         mmu_interval_set_seq(mni, cur_seq);
2479
2480         mem->invalid++;
2481         if (++process_info->evicted_bos == 1) {
2482                 /* First eviction, stop the queues */
2483                 r = kgd2kfd_quiesce_mm(mni->mm,
2484                                        KFD_QUEUE_EVICTION_TRIGGER_USERPTR);
2485                 if (r)
2486                         pr_err("Failed to quiesce KFD\n");
2487                 queue_delayed_work(system_freezable_wq,
2488                         &process_info->restore_userptr_work,
2489                         msecs_to_jiffies(AMDGPU_USERPTR_RESTORE_DELAY_MS));
2490         }
2491         mutex_unlock(&process_info->notifier_lock);
2492
2493         return r;
2494 }
2495
2496 /* Update invalid userptr BOs
2497  *
2498  * Moves invalidated (evicted) userptr BOs from userptr_valid_list to
2499  * userptr_inval_list and updates user pages for all BOs that have
2500  * been invalidated since their last update.
2501  */
2502 static int update_invalid_user_pages(struct amdkfd_process_info *process_info,
2503                                      struct mm_struct *mm)
2504 {
2505         struct kgd_mem *mem, *tmp_mem;
2506         struct amdgpu_bo *bo;
2507         struct ttm_operation_ctx ctx = { false, false };
2508         uint32_t invalid;
2509         int ret = 0;
2510
2511         mutex_lock(&process_info->notifier_lock);
2512
2513         /* Move all invalidated BOs to the userptr_inval_list */
2514         list_for_each_entry_safe(mem, tmp_mem,
2515                                  &process_info->userptr_valid_list,
2516                                  validate_list)
2517                 if (mem->invalid)
2518                         list_move_tail(&mem->validate_list,
2519                                        &process_info->userptr_inval_list);
2520
2521         /* Go through userptr_inval_list and update any invalid user_pages */
2522         list_for_each_entry(mem, &process_info->userptr_inval_list,
2523                             validate_list) {
2524                 invalid = mem->invalid;
2525                 if (!invalid)
2526                         /* BO hasn't been invalidated since the last
2527                          * revalidation attempt. Keep its page list.
2528                          */
2529                         continue;
2530
2531                 bo = mem->bo;
2532
2533                 amdgpu_ttm_tt_discard_user_pages(bo->tbo.ttm, mem->range);
2534                 mem->range = NULL;
2535
2536                 /* BO reservations and getting user pages (hmm_range_fault)
2537                  * must happen outside the notifier lock
2538                  */
2539                 mutex_unlock(&process_info->notifier_lock);
2540
2541                 /* Move the BO to system (CPU) domain if necessary to unmap
2542                  * and free the SG table
2543                  */
2544                 if (bo->tbo.resource->mem_type != TTM_PL_SYSTEM) {
2545                         if (amdgpu_bo_reserve(bo, true))
2546                                 return -EAGAIN;
2547                         amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
2548                         ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
2549                         amdgpu_bo_unreserve(bo);
2550                         if (ret) {
2551                                 pr_err("%s: Failed to invalidate userptr BO\n",
2552                                        __func__);
2553                                 return -EAGAIN;
2554                         }
2555                 }
2556
2557                 /* Get updated user pages */
2558                 ret = amdgpu_ttm_tt_get_user_pages(bo, bo->tbo.ttm->pages,
2559                                                    &mem->range);
2560                 if (ret) {
2561                         pr_debug("Failed %d to get user pages\n", ret);
2562
2563                         /* Return -EFAULT bad address error as success. It will
2564                          * fail later with a VM fault if the GPU tries to access
2565                          * it. Better than hanging indefinitely with stalled
2566                          * user mode queues.
2567                          *
2568                          * Return other error -EBUSY or -ENOMEM to retry restore
2569                          */
2570                         if (ret != -EFAULT)
2571                                 return ret;
2572
2573                         ret = 0;
2574                 }
2575
2576                 mutex_lock(&process_info->notifier_lock);
2577
2578                 /* Mark the BO as valid unless it was invalidated
2579                  * again concurrently.
2580                  */
2581                 if (mem->invalid != invalid) {
2582                         ret = -EAGAIN;
2583                         goto unlock_out;
2584                 }
2585                  /* set mem valid if mem has hmm range associated */
2586                 if (mem->range)
2587                         mem->invalid = 0;
2588         }
2589
2590 unlock_out:
2591         mutex_unlock(&process_info->notifier_lock);
2592
2593         return ret;
2594 }
2595
2596 /* Validate invalid userptr BOs
2597  *
2598  * Validates BOs on the userptr_inval_list. Also updates GPUVM page tables
2599  * with new page addresses and waits for the page table updates to complete.
2600  */
2601 static int validate_invalid_user_pages(struct amdkfd_process_info *process_info)
2602 {
2603         struct ttm_operation_ctx ctx = { false, false };
2604         struct amdgpu_sync sync;
2605         struct drm_exec exec;
2606
2607         struct amdgpu_vm *peer_vm;
2608         struct kgd_mem *mem, *tmp_mem;
2609         struct amdgpu_bo *bo;
2610         int ret;
2611
2612         amdgpu_sync_create(&sync);
2613
2614         drm_exec_init(&exec, 0, 0);
2615         /* Reserve all BOs and page tables for validation */
2616         drm_exec_until_all_locked(&exec) {
2617                 /* Reserve all the page directories */
2618                 list_for_each_entry(peer_vm, &process_info->vm_list_head,
2619                                     vm_list_node) {
2620                         ret = amdgpu_vm_lock_pd(peer_vm, &exec, 2);
2621                         drm_exec_retry_on_contention(&exec);
2622                         if (unlikely(ret))
2623                                 goto unreserve_out;
2624                 }
2625
2626                 /* Reserve the userptr_inval_list entries to resv_list */
2627                 list_for_each_entry(mem, &process_info->userptr_inval_list,
2628                                     validate_list) {
2629                         struct drm_gem_object *gobj;
2630
2631                         gobj = &mem->bo->tbo.base;
2632                         ret = drm_exec_prepare_obj(&exec, gobj, 1);
2633                         drm_exec_retry_on_contention(&exec);
2634                         if (unlikely(ret))
2635                                 goto unreserve_out;
2636                 }
2637         }
2638
2639         ret = process_validate_vms(process_info, NULL);
2640         if (ret)
2641                 goto unreserve_out;
2642
2643         /* Validate BOs and update GPUVM page tables */
2644         list_for_each_entry_safe(mem, tmp_mem,
2645                                  &process_info->userptr_inval_list,
2646                                  validate_list) {
2647                 struct kfd_mem_attachment *attachment;
2648
2649                 bo = mem->bo;
2650
2651                 /* Validate the BO if we got user pages */
2652                 if (bo->tbo.ttm->pages[0]) {
2653                         amdgpu_bo_placement_from_domain(bo, mem->domain);
2654                         ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
2655                         if (ret) {
2656                                 pr_err("%s: failed to validate BO\n", __func__);
2657                                 goto unreserve_out;
2658                         }
2659                 }
2660
2661                 /* Update mapping. If the BO was not validated
2662                  * (because we couldn't get user pages), this will
2663                  * clear the page table entries, which will result in
2664                  * VM faults if the GPU tries to access the invalid
2665                  * memory.
2666                  */
2667                 list_for_each_entry(attachment, &mem->attachments, list) {
2668                         if (!attachment->is_mapped)
2669                                 continue;
2670
2671                         kfd_mem_dmaunmap_attachment(mem, attachment);
2672                         ret = update_gpuvm_pte(mem, attachment, &sync);
2673                         if (ret) {
2674                                 pr_err("%s: update PTE failed\n", __func__);
2675                                 /* make sure this gets validated again */
2676                                 mutex_lock(&process_info->notifier_lock);
2677                                 mem->invalid++;
2678                                 mutex_unlock(&process_info->notifier_lock);
2679                                 goto unreserve_out;
2680                         }
2681                 }
2682         }
2683
2684         /* Update page directories */
2685         ret = process_update_pds(process_info, &sync);
2686
2687 unreserve_out:
2688         drm_exec_fini(&exec);
2689         amdgpu_sync_wait(&sync, false);
2690         amdgpu_sync_free(&sync);
2691
2692         return ret;
2693 }
2694
2695 /* Confirm that all user pages are valid while holding the notifier lock
2696  *
2697  * Moves valid BOs from the userptr_inval_list back to userptr_val_list.
2698  */
2699 static int confirm_valid_user_pages_locked(struct amdkfd_process_info *process_info)
2700 {
2701         struct kgd_mem *mem, *tmp_mem;
2702         int ret = 0;
2703
2704         list_for_each_entry_safe(mem, tmp_mem,
2705                                  &process_info->userptr_inval_list,
2706                                  validate_list) {
2707                 bool valid;
2708
2709                 /* keep mem without hmm range at userptr_inval_list */
2710                 if (!mem->range)
2711                          continue;
2712
2713                 /* Only check mem with hmm range associated */
2714                 valid = amdgpu_ttm_tt_get_user_pages_done(
2715                                         mem->bo->tbo.ttm, mem->range);
2716
2717                 mem->range = NULL;
2718                 if (!valid) {
2719                         WARN(!mem->invalid, "Invalid BO not marked invalid");
2720                         ret = -EAGAIN;
2721                         continue;
2722                 }
2723
2724                 if (mem->invalid) {
2725                         WARN(1, "Valid BO is marked invalid");
2726                         ret = -EAGAIN;
2727                         continue;
2728                 }
2729
2730                 list_move_tail(&mem->validate_list,
2731                                &process_info->userptr_valid_list);
2732         }
2733
2734         return ret;
2735 }
2736
2737 /* Worker callback to restore evicted userptr BOs
2738  *
2739  * Tries to update and validate all userptr BOs. If successful and no
2740  * concurrent evictions happened, the queues are restarted. Otherwise,
2741  * reschedule for another attempt later.
2742  */
2743 static void amdgpu_amdkfd_restore_userptr_worker(struct work_struct *work)
2744 {
2745         struct delayed_work *dwork = to_delayed_work(work);
2746         struct amdkfd_process_info *process_info =
2747                 container_of(dwork, struct amdkfd_process_info,
2748                              restore_userptr_work);
2749         struct task_struct *usertask;
2750         struct mm_struct *mm;
2751         uint32_t evicted_bos;
2752
2753         mutex_lock(&process_info->notifier_lock);
2754         evicted_bos = process_info->evicted_bos;
2755         mutex_unlock(&process_info->notifier_lock);
2756         if (!evicted_bos)
2757                 return;
2758
2759         /* Reference task and mm in case of concurrent process termination */
2760         usertask = get_pid_task(process_info->pid, PIDTYPE_PID);
2761         if (!usertask)
2762                 return;
2763         mm = get_task_mm(usertask);
2764         if (!mm) {
2765                 put_task_struct(usertask);
2766                 return;
2767         }
2768
2769         mutex_lock(&process_info->lock);
2770
2771         if (update_invalid_user_pages(process_info, mm))
2772                 goto unlock_out;
2773         /* userptr_inval_list can be empty if all evicted userptr BOs
2774          * have been freed. In that case there is nothing to validate
2775          * and we can just restart the queues.
2776          */
2777         if (!list_empty(&process_info->userptr_inval_list)) {
2778                 if (validate_invalid_user_pages(process_info))
2779                         goto unlock_out;
2780         }
2781         /* Final check for concurrent evicton and atomic update. If
2782          * another eviction happens after successful update, it will
2783          * be a first eviction that calls quiesce_mm. The eviction
2784          * reference counting inside KFD will handle this case.
2785          */
2786         mutex_lock(&process_info->notifier_lock);
2787         if (process_info->evicted_bos != evicted_bos)
2788                 goto unlock_notifier_out;
2789
2790         if (confirm_valid_user_pages_locked(process_info)) {
2791                 WARN(1, "User pages unexpectedly invalid");
2792                 goto unlock_notifier_out;
2793         }
2794
2795         process_info->evicted_bos = evicted_bos = 0;
2796
2797         if (kgd2kfd_resume_mm(mm)) {
2798                 pr_err("%s: Failed to resume KFD\n", __func__);
2799                 /* No recovery from this failure. Probably the CP is
2800                  * hanging. No point trying again.
2801                  */
2802         }
2803
2804 unlock_notifier_out:
2805         mutex_unlock(&process_info->notifier_lock);
2806 unlock_out:
2807         mutex_unlock(&process_info->lock);
2808
2809         /* If validation failed, reschedule another attempt */
2810         if (evicted_bos) {
2811                 queue_delayed_work(system_freezable_wq,
2812                         &process_info->restore_userptr_work,
2813                         msecs_to_jiffies(AMDGPU_USERPTR_RESTORE_DELAY_MS));
2814
2815                 kfd_smi_event_queue_restore_rescheduled(mm);
2816         }
2817         mmput(mm);
2818         put_task_struct(usertask);
2819 }
2820
2821 static void replace_eviction_fence(struct dma_fence __rcu **ef,
2822                                    struct dma_fence *new_ef)
2823 {
2824         struct dma_fence *old_ef = rcu_replace_pointer(*ef, new_ef, true
2825                 /* protected by process_info->lock */);
2826
2827         /* If we're replacing an unsignaled eviction fence, that fence will
2828          * never be signaled, and if anyone is still waiting on that fence,
2829          * they will hang forever. This should never happen. We should only
2830          * replace the fence in restore_work that only gets scheduled after
2831          * eviction work signaled the fence.
2832          */
2833         WARN_ONCE(!dma_fence_is_signaled(old_ef),
2834                   "Replacing unsignaled eviction fence");
2835         dma_fence_put(old_ef);
2836 }
2837
2838 /** amdgpu_amdkfd_gpuvm_restore_process_bos - Restore all BOs for the given
2839  *   KFD process identified by process_info
2840  *
2841  * @process_info: amdkfd_process_info of the KFD process
2842  *
2843  * After memory eviction, restore thread calls this function. The function
2844  * should be called when the Process is still valid. BO restore involves -
2845  *
2846  * 1.  Release old eviction fence and create new one
2847  * 2.  Get two copies of PD BO list from all the VMs. Keep one copy as pd_list.
2848  * 3   Use the second PD list and kfd_bo_list to create a list (ctx.list) of
2849  *     BOs that need to be reserved.
2850  * 4.  Reserve all the BOs
2851  * 5.  Validate of PD and PT BOs.
2852  * 6.  Validate all KFD BOs using kfd_bo_list and Map them and add new fence
2853  * 7.  Add fence to all PD and PT BOs.
2854  * 8.  Unreserve all BOs
2855  */
2856 int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence __rcu **ef)
2857 {
2858         struct amdkfd_process_info *process_info = info;
2859         struct amdgpu_vm *peer_vm;
2860         struct kgd_mem *mem;
2861         struct list_head duplicate_save;
2862         struct amdgpu_sync sync_obj;
2863         unsigned long failed_size = 0;
2864         unsigned long total_size = 0;
2865         struct drm_exec exec;
2866         int ret;
2867
2868         INIT_LIST_HEAD(&duplicate_save);
2869
2870         mutex_lock(&process_info->lock);
2871
2872         drm_exec_init(&exec, 0, 0);
2873         drm_exec_until_all_locked(&exec) {
2874                 list_for_each_entry(peer_vm, &process_info->vm_list_head,
2875                                     vm_list_node) {
2876                         ret = amdgpu_vm_lock_pd(peer_vm, &exec, 2);
2877                         drm_exec_retry_on_contention(&exec);
2878                         if (unlikely(ret))
2879                                 goto ttm_reserve_fail;
2880                 }
2881
2882                 /* Reserve all BOs and page tables/directory. Add all BOs from
2883                  * kfd_bo_list to ctx.list
2884                  */
2885                 list_for_each_entry(mem, &process_info->kfd_bo_list,
2886                                     validate_list) {
2887                         struct drm_gem_object *gobj;
2888
2889                         gobj = &mem->bo->tbo.base;
2890                         ret = drm_exec_prepare_obj(&exec, gobj, 1);
2891                         drm_exec_retry_on_contention(&exec);
2892                         if (unlikely(ret))
2893                                 goto ttm_reserve_fail;
2894                 }
2895         }
2896
2897         amdgpu_sync_create(&sync_obj);
2898
2899         /* Validate BOs and map them to GPUVM (update VM page tables). */
2900         list_for_each_entry(mem, &process_info->kfd_bo_list,
2901                             validate_list) {
2902
2903                 struct amdgpu_bo *bo = mem->bo;
2904                 uint32_t domain = mem->domain;
2905                 struct kfd_mem_attachment *attachment;
2906                 struct dma_resv_iter cursor;
2907                 struct dma_fence *fence;
2908
2909                 total_size += amdgpu_bo_size(bo);
2910
2911                 ret = amdgpu_amdkfd_bo_validate(bo, domain, false);
2912                 if (ret) {
2913                         pr_debug("Memory eviction: Validate BOs failed\n");
2914                         failed_size += amdgpu_bo_size(bo);
2915                         ret = amdgpu_amdkfd_bo_validate(bo,
2916                                                 AMDGPU_GEM_DOMAIN_GTT, false);
2917                         if (ret) {
2918                                 pr_debug("Memory eviction: Try again\n");
2919                                 goto validate_map_fail;
2920                         }
2921                 }
2922                 dma_resv_for_each_fence(&cursor, bo->tbo.base.resv,
2923                                         DMA_RESV_USAGE_KERNEL, fence) {
2924                         ret = amdgpu_sync_fence(&sync_obj, fence);
2925                         if (ret) {
2926                                 pr_debug("Memory eviction: Sync BO fence failed. Try again\n");
2927                                 goto validate_map_fail;
2928                         }
2929                 }
2930                 list_for_each_entry(attachment, &mem->attachments, list) {
2931                         if (!attachment->is_mapped)
2932                                 continue;
2933
2934                         if (attachment->bo_va->base.bo->tbo.pin_count)
2935                                 continue;
2936
2937                         kfd_mem_dmaunmap_attachment(mem, attachment);
2938                         ret = update_gpuvm_pte(mem, attachment, &sync_obj);
2939                         if (ret) {
2940                                 pr_debug("Memory eviction: update PTE failed. Try again\n");
2941                                 goto validate_map_fail;
2942                         }
2943                 }
2944         }
2945
2946         if (failed_size)
2947                 pr_debug("0x%lx/0x%lx in system\n", failed_size, total_size);
2948
2949         /* Validate PDs, PTs and evicted DMABuf imports last. Otherwise BO
2950          * validations above would invalidate DMABuf imports again.
2951          */
2952         ret = process_validate_vms(process_info, &exec.ticket);
2953         if (ret)
2954                 goto validate_map_fail;
2955
2956         /* Update mappings not managed by KFD */
2957         list_for_each_entry(peer_vm, &process_info->vm_list_head,
2958                         vm_list_node) {
2959                 struct amdgpu_device *adev = amdgpu_ttm_adev(
2960                         peer_vm->root.bo->tbo.bdev);
2961
2962                 ret = amdgpu_vm_handle_moved(adev, peer_vm, &exec.ticket);
2963                 if (ret) {
2964                         pr_debug("Memory eviction: handle moved failed. Try again\n");
2965                         goto validate_map_fail;
2966                 }
2967         }
2968
2969         /* Update page directories */
2970         ret = process_update_pds(process_info, &sync_obj);
2971         if (ret) {
2972                 pr_debug("Memory eviction: update PDs failed. Try again\n");
2973                 goto validate_map_fail;
2974         }
2975
2976         /* Sync with fences on all the page tables. They implicitly depend on any
2977          * move fences from amdgpu_vm_handle_moved above.
2978          */
2979         ret = process_sync_pds_resv(process_info, &sync_obj);
2980         if (ret) {
2981                 pr_debug("Memory eviction: Failed to sync to PD BO moving fence. Try again\n");
2982                 goto validate_map_fail;
2983         }
2984
2985         /* Wait for validate and PT updates to finish */
2986         amdgpu_sync_wait(&sync_obj, false);
2987
2988         /* The old eviction fence may be unsignaled if restore happens
2989          * after a GPU reset or suspend/resume. Keep the old fence in that
2990          * case. Otherwise release the old eviction fence and create new
2991          * one, because fence only goes from unsignaled to signaled once
2992          * and cannot be reused. Use context and mm from the old fence.
2993          *
2994          * If an old eviction fence signals after this check, that's OK.
2995          * Anyone signaling an eviction fence must stop the queues first
2996          * and schedule another restore worker.
2997          */
2998         if (dma_fence_is_signaled(&process_info->eviction_fence->base)) {
2999                 struct amdgpu_amdkfd_fence *new_fence =
3000                         amdgpu_amdkfd_fence_create(
3001                                 process_info->eviction_fence->base.context,
3002                                 process_info->eviction_fence->mm,
3003                                 NULL);
3004
3005                 if (!new_fence) {
3006                         pr_err("Failed to create eviction fence\n");
3007                         ret = -ENOMEM;
3008                         goto validate_map_fail;
3009                 }
3010                 dma_fence_put(&process_info->eviction_fence->base);
3011                 process_info->eviction_fence = new_fence;
3012                 replace_eviction_fence(ef, dma_fence_get(&new_fence->base));
3013         } else {
3014                 WARN_ONCE(*ef != &process_info->eviction_fence->base,
3015                           "KFD eviction fence doesn't match KGD process_info");
3016         }
3017
3018         /* Attach new eviction fence to all BOs except pinned ones */
3019         list_for_each_entry(mem, &process_info->kfd_bo_list, validate_list) {
3020                 if (mem->bo->tbo.pin_count)
3021                         continue;
3022
3023                 dma_resv_add_fence(mem->bo->tbo.base.resv,
3024                                    &process_info->eviction_fence->base,
3025                                    DMA_RESV_USAGE_BOOKKEEP);
3026         }
3027         /* Attach eviction fence to PD / PT BOs and DMABuf imports */
3028         list_for_each_entry(peer_vm, &process_info->vm_list_head,
3029                             vm_list_node) {
3030                 struct amdgpu_bo *bo = peer_vm->root.bo;
3031
3032                 dma_resv_add_fence(bo->tbo.base.resv,
3033                                    &process_info->eviction_fence->base,
3034                                    DMA_RESV_USAGE_BOOKKEEP);
3035         }
3036
3037 validate_map_fail:
3038         amdgpu_sync_free(&sync_obj);
3039 ttm_reserve_fail:
3040         drm_exec_fini(&exec);
3041         mutex_unlock(&process_info->lock);
3042         return ret;
3043 }
3044
3045 int amdgpu_amdkfd_add_gws_to_process(void *info, void *gws, struct kgd_mem **mem)
3046 {
3047         struct amdkfd_process_info *process_info = (struct amdkfd_process_info *)info;
3048         struct amdgpu_bo *gws_bo = (struct amdgpu_bo *)gws;
3049         int ret;
3050
3051         if (!info || !gws)
3052                 return -EINVAL;
3053
3054         *mem = kzalloc(sizeof(struct kgd_mem), GFP_KERNEL);
3055         if (!*mem)
3056                 return -ENOMEM;
3057
3058         mutex_init(&(*mem)->lock);
3059         INIT_LIST_HEAD(&(*mem)->attachments);
3060         (*mem)->bo = amdgpu_bo_ref(gws_bo);
3061         (*mem)->domain = AMDGPU_GEM_DOMAIN_GWS;
3062         (*mem)->process_info = process_info;
3063         add_kgd_mem_to_kfd_bo_list(*mem, process_info, false);
3064         amdgpu_sync_create(&(*mem)->sync);
3065
3066
3067         /* Validate gws bo the first time it is added to process */
3068         mutex_lock(&(*mem)->process_info->lock);
3069         ret = amdgpu_bo_reserve(gws_bo, false);
3070         if (unlikely(ret)) {
3071                 pr_err("Reserve gws bo failed %d\n", ret);
3072                 goto bo_reservation_failure;
3073         }
3074
3075         ret = amdgpu_amdkfd_bo_validate(gws_bo, AMDGPU_GEM_DOMAIN_GWS, true);
3076         if (ret) {
3077                 pr_err("GWS BO validate failed %d\n", ret);
3078                 goto bo_validation_failure;
3079         }
3080         /* GWS resource is shared b/t amdgpu and amdkfd
3081          * Add process eviction fence to bo so they can
3082          * evict each other.
3083          */
3084         ret = dma_resv_reserve_fences(gws_bo->tbo.base.resv, 1);
3085         if (ret)
3086                 goto reserve_shared_fail;
3087         dma_resv_add_fence(gws_bo->tbo.base.resv,
3088                            &process_info->eviction_fence->base,
3089                            DMA_RESV_USAGE_BOOKKEEP);
3090         amdgpu_bo_unreserve(gws_bo);
3091         mutex_unlock(&(*mem)->process_info->lock);
3092
3093         return ret;
3094
3095 reserve_shared_fail:
3096 bo_validation_failure:
3097         amdgpu_bo_unreserve(gws_bo);
3098 bo_reservation_failure:
3099         mutex_unlock(&(*mem)->process_info->lock);
3100         amdgpu_sync_free(&(*mem)->sync);
3101         remove_kgd_mem_from_kfd_bo_list(*mem, process_info);
3102         amdgpu_bo_unref(&gws_bo);
3103         mutex_destroy(&(*mem)->lock);
3104         kfree(*mem);
3105         *mem = NULL;
3106         return ret;
3107 }
3108
3109 int amdgpu_amdkfd_remove_gws_from_process(void *info, void *mem)
3110 {
3111         int ret;
3112         struct amdkfd_process_info *process_info = (struct amdkfd_process_info *)info;
3113         struct kgd_mem *kgd_mem = (struct kgd_mem *)mem;
3114         struct amdgpu_bo *gws_bo = kgd_mem->bo;
3115
3116         /* Remove BO from process's validate list so restore worker won't touch
3117          * it anymore
3118          */
3119         remove_kgd_mem_from_kfd_bo_list(kgd_mem, process_info);
3120
3121         ret = amdgpu_bo_reserve(gws_bo, false);
3122         if (unlikely(ret)) {
3123                 pr_err("Reserve gws bo failed %d\n", ret);
3124                 //TODO add BO back to validate_list?
3125                 return ret;
3126         }
3127         amdgpu_amdkfd_remove_eviction_fence(gws_bo,
3128                         process_info->eviction_fence);
3129         amdgpu_bo_unreserve(gws_bo);
3130         amdgpu_sync_free(&kgd_mem->sync);
3131         amdgpu_bo_unref(&gws_bo);
3132         mutex_destroy(&kgd_mem->lock);
3133         kfree(mem);
3134         return 0;
3135 }
3136
3137 /* Returns GPU-specific tiling mode information */
3138 int amdgpu_amdkfd_get_tile_config(struct amdgpu_device *adev,
3139                                 struct tile_config *config)
3140 {
3141         config->gb_addr_config = adev->gfx.config.gb_addr_config;
3142         config->tile_config_ptr = adev->gfx.config.tile_mode_array;
3143         config->num_tile_configs =
3144                         ARRAY_SIZE(adev->gfx.config.tile_mode_array);
3145         config->macro_tile_config_ptr =
3146                         adev->gfx.config.macrotile_mode_array;
3147         config->num_macro_tile_configs =
3148                         ARRAY_SIZE(adev->gfx.config.macrotile_mode_array);
3149
3150         /* Those values are not set from GFX9 onwards */
3151         config->num_banks = adev->gfx.config.num_banks;
3152         config->num_ranks = adev->gfx.config.num_ranks;
3153
3154         return 0;
3155 }
3156
3157 bool amdgpu_amdkfd_bo_mapped_to_dev(struct amdgpu_device *adev, struct kgd_mem *mem)
3158 {
3159         struct kfd_mem_attachment *entry;
3160
3161         list_for_each_entry(entry, &mem->attachments, list) {
3162                 if (entry->is_mapped && entry->adev == adev)
3163                         return true;
3164         }
3165         return false;
3166 }
3167
3168 #if defined(CONFIG_DEBUG_FS)
3169
3170 int kfd_debugfs_kfd_mem_limits(struct seq_file *m, void *data)
3171 {
3172
3173         spin_lock(&kfd_mem_limit.mem_limit_lock);
3174         seq_printf(m, "System mem used %lldM out of %lluM\n",
3175                   (kfd_mem_limit.system_mem_used >> 20),
3176                   (kfd_mem_limit.max_system_mem_limit >> 20));
3177         seq_printf(m, "TTM mem used %lldM out of %lluM\n",
3178                   (kfd_mem_limit.ttm_mem_used >> 20),
3179                   (kfd_mem_limit.max_ttm_mem_limit >> 20));
3180         spin_unlock(&kfd_mem_limit.mem_limit_lock);
3181
3182         return 0;
3183 }
3184
3185 #endif