1/*
   2 * Copyright 2014-2018 Advanced Micro Devices, Inc.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 */
 
 
 
  22#include <linux/dma-buf.h>
  23#include <linux/list.h>
  24#include <linux/pagemap.h>
  25#include <linux/sched/mm.h>
  26#include <linux/sched/task.h>
  27
  28#include "amdgpu_object.h"
  29#include "amdgpu_vm.h"
  30#include "amdgpu_amdkfd.h"
  31#include "amdgpu_dma_buf.h"
  32#include <uapi/linux/kfd_ioctl.h>
 
 
 
 
  33
  34/* BO flag to indicate a KFD userptr BO */
  35#define AMDGPU_AMDKFD_USERPTR_BO (1ULL << 63)
  36
  37/* Userptr restore delay, just long enough to allow consecutive VM
  38 * changes to accumulate
  39 */
  40#define AMDGPU_USERPTR_RESTORE_DELAY_MS 1
  41
  42/* Impose limit on how much memory KFD can use */
  43static struct {
  44	uint64_t max_system_mem_limit;
  45	uint64_t max_ttm_mem_limit;
  46	int64_t system_mem_used;
  47	int64_t ttm_mem_used;
  48	spinlock_t mem_limit_lock;
  49} kfd_mem_limit;
  50
  51/* Struct used for amdgpu_amdkfd_bo_validate */
  52struct amdgpu_vm_parser {
  53	uint32_t        domain;
  54	bool            wait;
  55};
  56
  57static const char * const domain_bit_to_string[] = {
  58		"CPU",
  59		"GTT",
  60		"VRAM",
  61		"GDS",
  62		"GWS",
  63		"OA"
  64};
  65
  66#define domain_string(domain) domain_bit_to_string[ffs(domain)-1]
  67
  68static void amdgpu_amdkfd_restore_userptr_worker(struct work_struct *work);
  69
  70
  71static inline struct amdgpu_device *get_amdgpu_device(struct kgd_dev *kgd)
  72{
  73	return (struct amdgpu_device *)kgd;
  74}
  75
  76static bool check_if_add_bo_to_vm(struct amdgpu_vm *avm,
  77		struct kgd_mem *mem)
  78{
  79	struct kfd_bo_va_list *entry;
  80
  81	list_for_each_entry(entry, &mem->bo_va_list, bo_list)
  82		if (entry->bo_va->base.vm == avm)
  83			return false;
  84
  85	return true;
  86}
  87
  88/* Set memory usage limits. Current, limits are
  89 *  System (TTM + userptr) memory - 15/16th System RAM
  90 *  TTM memory - 3/8th System RAM
  91 */
  92void amdgpu_amdkfd_gpuvm_init_mem_limits(void)
  93{
  94	struct sysinfo si;
  95	uint64_t mem;
  96
  97	si_meminfo(&si);
  98	mem = si.totalram - si.totalhigh;
  99	mem *= si.mem_unit;
 100
 101	spin_lock_init(&kfd_mem_limit.mem_limit_lock);
 102	kfd_mem_limit.max_system_mem_limit = mem - (mem >> 4);
 103	kfd_mem_limit.max_ttm_mem_limit = (mem >> 1) - (mem >> 3);
 104	pr_debug("Kernel memory limit %lluM, TTM limit %lluM\n",
 105		(kfd_mem_limit.max_system_mem_limit >> 20),
 106		(kfd_mem_limit.max_ttm_mem_limit >> 20));
 107}
 108
 109/* Estimate page table size needed to represent a given memory size
 110 *
 111 * With 4KB pages, we need one 8 byte PTE for each 4KB of memory
 112 * (factor 512, >> 9). With 2MB pages, we need one 8 byte PTE for 2MB
 113 * of memory (factor 256K, >> 18). ROCm user mode tries to optimize
 114 * for 2MB pages for TLB efficiency. However, small allocations and
 115 * fragmented system memory still need some 4KB pages. We choose a
 116 * compromise that should work in most cases without reserving too
 117 * much memory for page tables unnecessarily (factor 16K, >> 14).
 118 */
 119#define ESTIMATE_PT_SIZE(mem_size) ((mem_size) >> 14)
 120
 121static int amdgpu_amdkfd_reserve_mem_limit(struct amdgpu_device *adev,
 122		uint64_t size, u32 domain, bool sg)
 123{
 124	uint64_t reserved_for_pt =
 125		ESTIMATE_PT_SIZE(amdgpu_amdkfd_total_mem_size);
 126	size_t acc_size, system_mem_needed, ttm_mem_needed, vram_needed;
 
 127	int ret = 0;
 128
 129	acc_size = ttm_bo_dma_acc_size(&adev->mman.bdev, size,
 130				       sizeof(struct amdgpu_bo));
 131
 132	vram_needed = 0;
 133	if (domain == AMDGPU_GEM_DOMAIN_GTT) {
 134		/* TTM GTT memory */
 135		system_mem_needed = acc_size + size;
 136		ttm_mem_needed = acc_size + size;
 137	} else if (domain == AMDGPU_GEM_DOMAIN_CPU && !sg) {
 138		/* Userptr */
 139		system_mem_needed = acc_size + size;
 140		ttm_mem_needed = acc_size;
 141	} else {
 142		/* VRAM and SG */
 143		system_mem_needed = acc_size;
 144		ttm_mem_needed = acc_size;
 145		if (domain == AMDGPU_GEM_DOMAIN_VRAM)
 146			vram_needed = size;
 147	}
 148
 149	spin_lock(&kfd_mem_limit.mem_limit_lock);
 150
 151	if ((kfd_mem_limit.system_mem_used + system_mem_needed >
 152	     kfd_mem_limit.max_system_mem_limit) ||
 153	    (kfd_mem_limit.ttm_mem_used + ttm_mem_needed >
 154	     kfd_mem_limit.max_ttm_mem_limit) ||
 155	    (adev->kfd.vram_used + vram_needed >
 156	     adev->gmc.real_vram_size - reserved_for_pt)) {
 157		ret = -ENOMEM;
 158	} else {
 159		kfd_mem_limit.system_mem_used += system_mem_needed;
 160		kfd_mem_limit.ttm_mem_used += ttm_mem_needed;
 161		adev->kfd.vram_used += vram_needed;
 162	}
 163
 164	spin_unlock(&kfd_mem_limit.mem_limit_lock);
 165	return ret;
 166}
 167
 168static void unreserve_mem_limit(struct amdgpu_device *adev,
 169		uint64_t size, u32 domain, bool sg)
 170{
 171	size_t acc_size;
 172
 173	acc_size = ttm_bo_dma_acc_size(&adev->mman.bdev, size,
 174				       sizeof(struct amdgpu_bo));
 175
 176	spin_lock(&kfd_mem_limit.mem_limit_lock);
 177	if (domain == AMDGPU_GEM_DOMAIN_GTT) {
 178		kfd_mem_limit.system_mem_used -= (acc_size + size);
 179		kfd_mem_limit.ttm_mem_used -= (acc_size + size);
 180	} else if (domain == AMDGPU_GEM_DOMAIN_CPU && !sg) {
 181		kfd_mem_limit.system_mem_used -= (acc_size + size);
 182		kfd_mem_limit.ttm_mem_used -= acc_size;
 183	} else {
 184		kfd_mem_limit.system_mem_used -= acc_size;
 185		kfd_mem_limit.ttm_mem_used -= acc_size;
 186		if (domain == AMDGPU_GEM_DOMAIN_VRAM) {
 187			adev->kfd.vram_used -= size;
 188			WARN_ONCE(adev->kfd.vram_used < 0,
 189				  "kfd VRAM memory accounting unbalanced");
 190		}
 191	}
 192	WARN_ONCE(kfd_mem_limit.system_mem_used < 0,
 193		  "kfd system memory accounting unbalanced");
 194	WARN_ONCE(kfd_mem_limit.ttm_mem_used < 0,
 195		  "kfd TTM memory accounting unbalanced");
 196
 197	spin_unlock(&kfd_mem_limit.mem_limit_lock);
 198}
 199
 200void amdgpu_amdkfd_unreserve_memory_limit(struct amdgpu_bo *bo)
 201{
 202	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 203	u32 domain = bo->preferred_domains;
 204	bool sg = (bo->preferred_domains == AMDGPU_GEM_DOMAIN_CPU);
 205
 206	if (bo->flags & AMDGPU_AMDKFD_USERPTR_BO) {
 207		domain = AMDGPU_GEM_DOMAIN_CPU;
 208		sg = false;
 209	}
 210
 211	unreserve_mem_limit(adev, amdgpu_bo_size(bo), domain, sg);
 212}
 213
 214
 215/* amdgpu_amdkfd_remove_eviction_fence - Removes eviction fence from BO's
 216 *  reservation object.
 217 *
 218 * @bo: [IN] Remove eviction fence(s) from this BO
 219 * @ef: [IN] This eviction fence is removed if it
 220 *  is present in the shared list.
 221 *
 222 * NOTE: Must be called with BO reserved i.e. bo->tbo.resv->lock held.
 223 */
 224static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
 225					struct amdgpu_amdkfd_fence *ef)
 226{
 227	struct dma_resv *resv = bo->tbo.base.resv;
 228	struct dma_resv_list *old, *new;
 229	unsigned int i, j, k;
 230
 231	if (!ef)
 232		return -EINVAL;
 233
 234	old = dma_resv_get_list(resv);
 235	if (!old)
 236		return 0;
 237
 238	new = kmalloc(offsetof(typeof(*new), shared[old->shared_max]),
 239		      GFP_KERNEL);
 240	if (!new)
 241		return -ENOMEM;
 242
 243	/* Go through all the shared fences in the resevation object and sort
 244	 * the interesting ones to the end of the list.
 245	 */
 246	for (i = 0, j = old->shared_count, k = 0; i < old->shared_count; ++i) {
 247		struct dma_fence *f;
 248
 249		f = rcu_dereference_protected(old->shared[i],
 250					      dma_resv_held(resv));
 251
 252		if (f->context == ef->base.context)
 253			RCU_INIT_POINTER(new->shared[--j], f);
 254		else
 255			RCU_INIT_POINTER(new->shared[k++], f);
 256	}
 257	new->shared_max = old->shared_max;
 258	new->shared_count = k;
 259
 260	/* Install the new fence list, seqcount provides the barriers */
 
 261	write_seqcount_begin(&resv->seq);
 262	RCU_INIT_POINTER(resv->fence, new);
 263	write_seqcount_end(&resv->seq);
 
 264
 265	/* Drop the references to the removed fences or move them to ef_list */
 266	for (i = j, k = 0; i < old->shared_count; ++i) {
 267		struct dma_fence *f;
 268
 269		f = rcu_dereference_protected(new->shared[i],
 270					      dma_resv_held(resv));
 271		dma_fence_put(f);
 272	}
 273	kfree_rcu(old, rcu);
 274
 275	return 0;
 276}
 277
 278int amdgpu_amdkfd_remove_fence_on_pt_pd_bos(struct amdgpu_bo *bo)
 279{
 280	struct amdgpu_bo *root = bo;
 281	struct amdgpu_vm_bo_base *vm_bo;
 282	struct amdgpu_vm *vm;
 283	struct amdkfd_process_info *info;
 284	struct amdgpu_amdkfd_fence *ef;
 285	int ret;
 286
 287	/* we can always get vm_bo from root PD bo.*/
 288	while (root->parent)
 289		root = root->parent;
 290
 291	vm_bo = root->vm_bo;
 292	if (!vm_bo)
 293		return 0;
 294
 295	vm = vm_bo->vm;
 296	if (!vm)
 297		return 0;
 298
 299	info = vm->process_info;
 300	if (!info || !info->eviction_fence)
 301		return 0;
 302
 303	ef = container_of(dma_fence_get(&info->eviction_fence->base),
 304			struct amdgpu_amdkfd_fence, base);
 305
 306	BUG_ON(!dma_resv_trylock(bo->tbo.base.resv));
 307	ret = amdgpu_amdkfd_remove_eviction_fence(bo, ef);
 308	dma_resv_unlock(bo->tbo.base.resv);
 309
 310	dma_fence_put(&ef->base);
 311	return ret;
 312}
 313
 314static int amdgpu_amdkfd_bo_validate(struct amdgpu_bo *bo, uint32_t domain,
 315				     bool wait)
 316{
 317	struct ttm_operation_ctx ctx = { false, false };
 318	int ret;
 319
 320	if (WARN(amdgpu_ttm_tt_get_usermm(bo->tbo.ttm),
 321		 "Called with userptr BO"))
 322		return -EINVAL;
 323
 324	amdgpu_bo_placement_from_domain(bo, domain);
 325
 326	ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 327	if (ret)
 328		goto validate_fail;
 329	if (wait)
 330		amdgpu_bo_sync_wait(bo, AMDGPU_FENCE_OWNER_KFD, false);
 331
 332validate_fail:
 333	return ret;
 334}
 335
 336static int amdgpu_amdkfd_validate(void *param, struct amdgpu_bo *bo)
 337{
 338	struct amdgpu_vm_parser *p = param;
 339
 340	return amdgpu_amdkfd_bo_validate(bo, p->domain, p->wait);
 341}
 342
 343/* vm_validate_pt_pd_bos - Validate page table and directory BOs
 344 *
 345 * Page directories are not updated here because huge page handling
 346 * during page table updates can invalidate page directory entries
 347 * again. Page directories are only updated after updating page
 348 * tables.
 349 */
 350static int vm_validate_pt_pd_bos(struct amdgpu_vm *vm)
 351{
 352	struct amdgpu_bo *pd = vm->root.base.bo;
 353	struct amdgpu_device *adev = amdgpu_ttm_adev(pd->tbo.bdev);
 354	struct amdgpu_vm_parser param;
 355	int ret;
 356
 357	param.domain = AMDGPU_GEM_DOMAIN_VRAM;
 358	param.wait = false;
 359
 360	ret = amdgpu_vm_validate_pt_bos(adev, vm, amdgpu_amdkfd_validate,
 361					&param);
 362	if (ret) {
 363		pr_err("failed to validate PT BOs\n");
 364		return ret;
 365	}
 366
 367	ret = amdgpu_amdkfd_validate(&param, pd);
 368	if (ret) {
 369		pr_err("failed to validate PD\n");
 370		return ret;
 371	}
 372
 373	vm->pd_phys_addr = amdgpu_gmc_pd_addr(vm->root.base.bo);
 374
 375	if (vm->use_cpu_for_update) {
 376		ret = amdgpu_bo_kmap(pd, NULL);
 377		if (ret) {
 378			pr_err("failed to kmap PD, ret=%d\n", ret);
 379			return ret;
 380		}
 381	}
 382
 383	return 0;
 384}
 385
 386static int vm_update_pds(struct amdgpu_vm *vm, struct amdgpu_sync *sync)
 387{
 388	struct amdgpu_bo *pd = vm->root.base.bo;
 389	struct amdgpu_device *adev = amdgpu_ttm_adev(pd->tbo.bdev);
 390	int ret;
 391
 392	ret = amdgpu_vm_update_pdes(adev, vm, false);
 393	if (ret)
 394		return ret;
 395
 396	return amdgpu_sync_fence(sync, vm->last_update);
 397}
 398
 399static uint64_t get_pte_flags(struct amdgpu_device *adev, struct kgd_mem *mem)
 400{
 401	struct amdgpu_device *bo_adev = amdgpu_ttm_adev(mem->bo->tbo.bdev);
 402	bool coherent = mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_COHERENT;
 403	uint32_t mapping_flags;
 404
 405	mapping_flags = AMDGPU_VM_PAGE_READABLE;
 406	if (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE)
 407		mapping_flags |= AMDGPU_VM_PAGE_WRITEABLE;
 408	if (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE)
 409		mapping_flags |= AMDGPU_VM_PAGE_EXECUTABLE;
 410
 411	switch (adev->asic_type) {
 412	case CHIP_ARCTURUS:
 413		if (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_VRAM) {
 414			if (bo_adev == adev)
 415				mapping_flags |= coherent ?
 416					AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW;
 417			else
 418				mapping_flags |= AMDGPU_VM_MTYPE_UC;
 419		} else {
 420			mapping_flags |= coherent ?
 421				AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC;
 422		}
 423		break;
 424	default:
 425		mapping_flags |= coherent ?
 426			AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC;
 427	}
 428
 429	return amdgpu_gem_va_map_flags(adev, mapping_flags);
 430}
 431
 432/* add_bo_to_vm - Add a BO to a VM
 433 *
 434 * Everything that needs to bo done only once when a BO is first added
 435 * to a VM. It can later be mapped and unmapped many times without
 436 * repeating these steps.
 437 *
 438 * 1. Allocate and initialize BO VA entry data structure
 439 * 2. Add BO to the VM
 440 * 3. Determine ASIC-specific PTE flags
 441 * 4. Alloc page tables and directories if needed
 442 * 4a.  Validate new page tables and directories
 443 */
 444static int add_bo_to_vm(struct amdgpu_device *adev, struct kgd_mem *mem,
 445		struct amdgpu_vm *vm, bool is_aql,
 446		struct kfd_bo_va_list **p_bo_va_entry)
 447{
 448	int ret;
 449	struct kfd_bo_va_list *bo_va_entry;
 450	struct amdgpu_bo *bo = mem->bo;
 451	uint64_t va = mem->va;
 452	struct list_head *list_bo_va = &mem->bo_va_list;
 453	unsigned long bo_size = bo->tbo.mem.size;
 454
 455	if (!va) {
 456		pr_err("Invalid VA when adding BO to VM\n");
 457		return -EINVAL;
 458	}
 459
 460	if (is_aql)
 461		va += bo_size;
 462
 463	bo_va_entry = kzalloc(sizeof(*bo_va_entry), GFP_KERNEL);
 464	if (!bo_va_entry)
 465		return -ENOMEM;
 466
 467	pr_debug("\t add VA 0x%llx - 0x%llx to vm %p\n", va,
 468			va + bo_size, vm);
 469
 470	/* Add BO to VM internal data structures*/
 471	bo_va_entry->bo_va = amdgpu_vm_bo_add(adev, vm, bo);
 472	if (!bo_va_entry->bo_va) {
 473		ret = -EINVAL;
 474		pr_err("Failed to add BO object to VM. ret == %d\n",
 475				ret);
 476		goto err_vmadd;
 477	}
 478
 479	bo_va_entry->va = va;
 480	bo_va_entry->pte_flags = get_pte_flags(adev, mem);
 
 481	bo_va_entry->kgd_dev = (void *)adev;
 482	list_add(&bo_va_entry->bo_list, list_bo_va);
 483
 484	if (p_bo_va_entry)
 485		*p_bo_va_entry = bo_va_entry;
 486
 487	/* Allocate validate page tables if needed */
 488	ret = vm_validate_pt_pd_bos(vm);
 489	if (ret) {
 490		pr_err("validate_pt_pd_bos() failed\n");
 491		goto err_alloc_pts;
 492	}
 493
 494	return 0;
 495
 496err_alloc_pts:
 497	amdgpu_vm_bo_rmv(adev, bo_va_entry->bo_va);
 498	list_del(&bo_va_entry->bo_list);
 499err_vmadd:
 500	kfree(bo_va_entry);
 501	return ret;
 502}
 503
 504static void remove_bo_from_vm(struct amdgpu_device *adev,
 505		struct kfd_bo_va_list *entry, unsigned long size)
 506{
 507	pr_debug("\t remove VA 0x%llx - 0x%llx in entry %p\n",
 508			entry->va,
 509			entry->va + size, entry);
 510	amdgpu_vm_bo_rmv(adev, entry->bo_va);
 511	list_del(&entry->bo_list);
 512	kfree(entry);
 513}
 514
 515static void add_kgd_mem_to_kfd_bo_list(struct kgd_mem *mem,
 516				struct amdkfd_process_info *process_info,
 517				bool userptr)
 518{
 519	struct ttm_validate_buffer *entry = &mem->validate_list;
 520	struct amdgpu_bo *bo = mem->bo;
 521
 522	INIT_LIST_HEAD(&entry->head);
 523	entry->num_shared = 1;
 524	entry->bo = &bo->tbo;
 525	mutex_lock(&process_info->lock);
 526	if (userptr)
 527		list_add_tail(&entry->head, &process_info->userptr_valid_list);
 528	else
 529		list_add_tail(&entry->head, &process_info->kfd_bo_list);
 530	mutex_unlock(&process_info->lock);
 531}
 532
 533static void remove_kgd_mem_from_kfd_bo_list(struct kgd_mem *mem,
 534		struct amdkfd_process_info *process_info)
 535{
 536	struct ttm_validate_buffer *bo_list_entry;
 537
 538	bo_list_entry = &mem->validate_list;
 539	mutex_lock(&process_info->lock);
 540	list_del(&bo_list_entry->head);
 541	mutex_unlock(&process_info->lock);
 542}
 543
 544/* Initializes user pages. It registers the MMU notifier and validates
 545 * the userptr BO in the GTT domain.
 546 *
 547 * The BO must already be on the userptr_valid_list. Otherwise an
 548 * eviction and restore may happen that leaves the new BO unmapped
 549 * with the user mode queues running.
 550 *
 551 * Takes the process_info->lock to protect against concurrent restore
 552 * workers.
 553 *
 554 * Returns 0 for success, negative errno for errors.
 555 */
 556static int init_user_pages(struct kgd_mem *mem, uint64_t user_addr)
 
 557{
 558	struct amdkfd_process_info *process_info = mem->process_info;
 559	struct amdgpu_bo *bo = mem->bo;
 560	struct ttm_operation_ctx ctx = { true, false };
 561	int ret = 0;
 562
 563	mutex_lock(&process_info->lock);
 564
 565	ret = amdgpu_ttm_tt_set_userptr(bo->tbo.ttm, user_addr, 0);
 566	if (ret) {
 567		pr_err("%s: Failed to set userptr: %d\n", __func__, ret);
 568		goto out;
 569	}
 570
 571	ret = amdgpu_mn_register(bo, user_addr);
 572	if (ret) {
 573		pr_err("%s: Failed to register MMU notifier: %d\n",
 574		       __func__, ret);
 575		goto out;
 576	}
 577
 578	ret = amdgpu_ttm_tt_get_user_pages(bo, bo->tbo.ttm->pages);
 579	if (ret) {
 580		pr_err("%s: Failed to get user pages: %d\n", __func__, ret);
 581		goto unregister_out;
 582	}
 583
 584	ret = amdgpu_bo_reserve(bo, true);
 585	if (ret) {
 586		pr_err("%s: Failed to reserve BO\n", __func__);
 587		goto release_out;
 588	}
 589	amdgpu_bo_placement_from_domain(bo, mem->domain);
 590	ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 591	if (ret)
 592		pr_err("%s: failed to validate BO\n", __func__);
 593	amdgpu_bo_unreserve(bo);
 594
 595release_out:
 596	amdgpu_ttm_tt_get_user_pages_done(bo->tbo.ttm);
 597unregister_out:
 598	if (ret)
 599		amdgpu_mn_unregister(bo);
 600out:
 601	mutex_unlock(&process_info->lock);
 602	return ret;
 603}
 604
 605/* Reserving a BO and its page table BOs must happen atomically to
 606 * avoid deadlocks. Some operations update multiple VMs at once. Track
 607 * all the reservation info in a context structure. Optionally a sync
 608 * object can track VM updates.
 609 */
 610struct bo_vm_reservation_context {
 611	struct amdgpu_bo_list_entry kfd_bo; /* BO list entry for the KFD BO */
 612	unsigned int n_vms;		    /* Number of VMs reserved	    */
 613	struct amdgpu_bo_list_entry *vm_pd; /* Array of VM BO list entries  */
 614	struct ww_acquire_ctx ticket;	    /* Reservation ticket	    */
 615	struct list_head list, duplicates;  /* BO lists			    */
 616	struct amdgpu_sync *sync;	    /* Pointer to sync object	    */
 617	bool reserved;			    /* Whether BOs are reserved	    */
 618};
 619
 620enum bo_vm_match {
 621	BO_VM_NOT_MAPPED = 0,	/* Match VMs where a BO is not mapped */
 622	BO_VM_MAPPED,		/* Match VMs where a BO is mapped     */
 623	BO_VM_ALL,		/* Match all VMs a BO was added to    */
 624};
 625
 626/**
 627 * reserve_bo_and_vm - reserve a BO and a VM unconditionally.
 628 * @mem: KFD BO structure.
 629 * @vm: the VM to reserve.
 630 * @ctx: the struct that will be used in unreserve_bo_and_vms().
 631 */
 632static int reserve_bo_and_vm(struct kgd_mem *mem,
 633			      struct amdgpu_vm *vm,
 634			      struct bo_vm_reservation_context *ctx)
 635{
 636	struct amdgpu_bo *bo = mem->bo;
 637	int ret;
 638
 639	WARN_ON(!vm);
 640
 641	ctx->reserved = false;
 642	ctx->n_vms = 1;
 643	ctx->sync = &mem->sync;
 644
 645	INIT_LIST_HEAD(&ctx->list);
 646	INIT_LIST_HEAD(&ctx->duplicates);
 647
 648	ctx->vm_pd = kcalloc(ctx->n_vms, sizeof(*ctx->vm_pd), GFP_KERNEL);
 649	if (!ctx->vm_pd)
 650		return -ENOMEM;
 651
 652	ctx->kfd_bo.priority = 0;
 653	ctx->kfd_bo.tv.bo = &bo->tbo;
 654	ctx->kfd_bo.tv.num_shared = 1;
 655	list_add(&ctx->kfd_bo.tv.head, &ctx->list);
 656
 657	amdgpu_vm_get_pd_bo(vm, &ctx->list, &ctx->vm_pd[0]);
 658
 659	ret = ttm_eu_reserve_buffers(&ctx->ticket, &ctx->list,
 660				     false, &ctx->duplicates);
 661	if (ret) {
 662		pr_err("Failed to reserve buffers in ttm.\n");
 
 
 663		kfree(ctx->vm_pd);
 664		ctx->vm_pd = NULL;
 665		return ret;
 666	}
 667
 668	ctx->reserved = true;
 669	return 0;
 670}
 671
 672/**
 673 * reserve_bo_and_cond_vms - reserve a BO and some VMs conditionally
 674 * @mem: KFD BO structure.
 675 * @vm: the VM to reserve. If NULL, then all VMs associated with the BO
 676 * is used. Otherwise, a single VM associated with the BO.
 677 * @map_type: the mapping status that will be used to filter the VMs.
 678 * @ctx: the struct that will be used in unreserve_bo_and_vms().
 679 *
 680 * Returns 0 for success, negative for failure.
 681 */
 682static int reserve_bo_and_cond_vms(struct kgd_mem *mem,
 683				struct amdgpu_vm *vm, enum bo_vm_match map_type,
 684				struct bo_vm_reservation_context *ctx)
 685{
 686	struct amdgpu_bo *bo = mem->bo;
 687	struct kfd_bo_va_list *entry;
 688	unsigned int i;
 689	int ret;
 690
 691	ctx->reserved = false;
 692	ctx->n_vms = 0;
 693	ctx->vm_pd = NULL;
 694	ctx->sync = &mem->sync;
 695
 696	INIT_LIST_HEAD(&ctx->list);
 697	INIT_LIST_HEAD(&ctx->duplicates);
 698
 699	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
 700		if ((vm && vm != entry->bo_va->base.vm) ||
 701			(entry->is_mapped != map_type
 702			&& map_type != BO_VM_ALL))
 703			continue;
 704
 705		ctx->n_vms++;
 706	}
 707
 708	if (ctx->n_vms != 0) {
 709		ctx->vm_pd = kcalloc(ctx->n_vms, sizeof(*ctx->vm_pd),
 710				     GFP_KERNEL);
 711		if (!ctx->vm_pd)
 712			return -ENOMEM;
 713	}
 714
 715	ctx->kfd_bo.priority = 0;
 716	ctx->kfd_bo.tv.bo = &bo->tbo;
 717	ctx->kfd_bo.tv.num_shared = 1;
 718	list_add(&ctx->kfd_bo.tv.head, &ctx->list);
 719
 720	i = 0;
 721	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
 722		if ((vm && vm != entry->bo_va->base.vm) ||
 723			(entry->is_mapped != map_type
 724			&& map_type != BO_VM_ALL))
 725			continue;
 726
 727		amdgpu_vm_get_pd_bo(entry->bo_va->base.vm, &ctx->list,
 728				&ctx->vm_pd[i]);
 729		i++;
 730	}
 731
 732	ret = ttm_eu_reserve_buffers(&ctx->ticket, &ctx->list,
 733				     false, &ctx->duplicates);
 734	if (ret) {
 
 
 735		pr_err("Failed to reserve buffers in ttm.\n");
 
 
 736		kfree(ctx->vm_pd);
 737		ctx->vm_pd = NULL;
 738		return ret;
 739	}
 740
 741	ctx->reserved = true;
 742	return 0;
 743}
 744
 745/**
 746 * unreserve_bo_and_vms - Unreserve BO and VMs from a reservation context
 747 * @ctx: Reservation context to unreserve
 748 * @wait: Optionally wait for a sync object representing pending VM updates
 749 * @intr: Whether the wait is interruptible
 750 *
 751 * Also frees any resources allocated in
 752 * reserve_bo_and_(cond_)vm(s). Returns the status from
 753 * amdgpu_sync_wait.
 754 */
 755static int unreserve_bo_and_vms(struct bo_vm_reservation_context *ctx,
 756				 bool wait, bool intr)
 757{
 758	int ret = 0;
 759
 760	if (wait)
 761		ret = amdgpu_sync_wait(ctx->sync, intr);
 762
 763	if (ctx->reserved)
 764		ttm_eu_backoff_reservation(&ctx->ticket, &ctx->list);
 765	kfree(ctx->vm_pd);
 766
 767	ctx->sync = NULL;
 768
 769	ctx->reserved = false;
 770	ctx->vm_pd = NULL;
 771
 772	return ret;
 773}
 774
 775static int unmap_bo_from_gpuvm(struct amdgpu_device *adev,
 776				struct kfd_bo_va_list *entry,
 777				struct amdgpu_sync *sync)
 778{
 779	struct amdgpu_bo_va *bo_va = entry->bo_va;
 780	struct amdgpu_vm *vm = bo_va->base.vm;
 781
 782	amdgpu_vm_bo_unmap(adev, bo_va, entry->va);
 783
 784	amdgpu_vm_clear_freed(adev, vm, &bo_va->last_pt_update);
 785
 786	amdgpu_sync_fence(sync, bo_va->last_pt_update);
 787
 788	return 0;
 789}
 790
 791static int update_gpuvm_pte(struct amdgpu_device *adev,
 792		struct kfd_bo_va_list *entry,
 793		struct amdgpu_sync *sync)
 794{
 795	int ret;
 796	struct amdgpu_bo_va *bo_va = entry->bo_va;
 797
 798	/* Update the page tables  */
 799	ret = amdgpu_vm_bo_update(adev, bo_va, false);
 800	if (ret) {
 801		pr_err("amdgpu_vm_bo_update failed\n");
 802		return ret;
 803	}
 804
 805	return amdgpu_sync_fence(sync, bo_va->last_pt_update);
 806}
 807
 808static int map_bo_to_gpuvm(struct amdgpu_device *adev,
 809		struct kfd_bo_va_list *entry, struct amdgpu_sync *sync,
 810		bool no_update_pte)
 811{
 812	int ret;
 813
 814	/* Set virtual address for the allocation */
 815	ret = amdgpu_vm_bo_map(adev, entry->bo_va, entry->va, 0,
 816			       amdgpu_bo_size(entry->bo_va->base.bo),
 817			       entry->pte_flags);
 818	if (ret) {
 819		pr_err("Failed to map VA 0x%llx in vm. ret %d\n",
 820				entry->va, ret);
 821		return ret;
 822	}
 823
 824	if (no_update_pte)
 825		return 0;
 826
 827	ret = update_gpuvm_pte(adev, entry, sync);
 828	if (ret) {
 829		pr_err("update_gpuvm_pte() failed\n");
 830		goto update_gpuvm_pte_failed;
 831	}
 832
 833	return 0;
 834
 835update_gpuvm_pte_failed:
 836	unmap_bo_from_gpuvm(adev, entry, sync);
 837	return ret;
 838}
 839
 840static struct sg_table *create_doorbell_sg(uint64_t addr, uint32_t size)
 841{
 842	struct sg_table *sg = kmalloc(sizeof(*sg), GFP_KERNEL);
 843
 844	if (!sg)
 845		return NULL;
 846	if (sg_alloc_table(sg, 1, GFP_KERNEL)) {
 847		kfree(sg);
 848		return NULL;
 849	}
 850	sg->sgl->dma_address = addr;
 851	sg->sgl->length = size;
 852#ifdef CONFIG_NEED_SG_DMA_LENGTH
 853	sg->sgl->dma_length = size;
 854#endif
 855	return sg;
 856}
 857
 858static int process_validate_vms(struct amdkfd_process_info *process_info)
 859{
 860	struct amdgpu_vm *peer_vm;
 861	int ret;
 862
 863	list_for_each_entry(peer_vm, &process_info->vm_list_head,
 864			    vm_list_node) {
 865		ret = vm_validate_pt_pd_bos(peer_vm);
 866		if (ret)
 867			return ret;
 868	}
 869
 870	return 0;
 871}
 872
 873static int process_sync_pds_resv(struct amdkfd_process_info *process_info,
 874				 struct amdgpu_sync *sync)
 875{
 876	struct amdgpu_vm *peer_vm;
 877	int ret;
 878
 879	list_for_each_entry(peer_vm, &process_info->vm_list_head,
 880			    vm_list_node) {
 881		struct amdgpu_bo *pd = peer_vm->root.base.bo;
 882
 883		ret = amdgpu_sync_resv(NULL, sync, pd->tbo.base.resv,
 884				       AMDGPU_SYNC_NE_OWNER,
 885				       AMDGPU_FENCE_OWNER_KFD);
 886		if (ret)
 887			return ret;
 888	}
 889
 890	return 0;
 891}
 892
 893static int process_update_pds(struct amdkfd_process_info *process_info,
 894			      struct amdgpu_sync *sync)
 895{
 896	struct amdgpu_vm *peer_vm;
 897	int ret;
 898
 899	list_for_each_entry(peer_vm, &process_info->vm_list_head,
 900			    vm_list_node) {
 901		ret = vm_update_pds(peer_vm, sync);
 902		if (ret)
 903			return ret;
 904	}
 905
 906	return 0;
 907}
 908
 909static int init_kfd_vm(struct amdgpu_vm *vm, void **process_info,
 910		       struct dma_fence **ef)
 911{
 912	struct amdkfd_process_info *info = NULL;
 913	int ret;
 914
 915	if (!*process_info) {
 916		info = kzalloc(sizeof(*info), GFP_KERNEL);
 917		if (!info)
 918			return -ENOMEM;
 919
 920		mutex_init(&info->lock);
 921		INIT_LIST_HEAD(&info->vm_list_head);
 922		INIT_LIST_HEAD(&info->kfd_bo_list);
 923		INIT_LIST_HEAD(&info->userptr_valid_list);
 924		INIT_LIST_HEAD(&info->userptr_inval_list);
 925
 926		info->eviction_fence =
 927			amdgpu_amdkfd_fence_create(dma_fence_context_alloc(1),
 928						   current->mm);
 929		if (!info->eviction_fence) {
 930			pr_err("Failed to create eviction fence\n");
 931			ret = -ENOMEM;
 932			goto create_evict_fence_fail;
 933		}
 934
 935		info->pid = get_task_pid(current->group_leader, PIDTYPE_PID);
 936		atomic_set(&info->evicted_bos, 0);
 937		INIT_DELAYED_WORK(&info->restore_userptr_work,
 938				  amdgpu_amdkfd_restore_userptr_worker);
 939
 940		*process_info = info;
 941		*ef = dma_fence_get(&info->eviction_fence->base);
 942	}
 943
 944	vm->process_info = *process_info;
 945
 946	/* Validate page directory and attach eviction fence */
 947	ret = amdgpu_bo_reserve(vm->root.base.bo, true);
 948	if (ret)
 949		goto reserve_pd_fail;
 950	ret = vm_validate_pt_pd_bos(vm);
 951	if (ret) {
 952		pr_err("validate_pt_pd_bos() failed\n");
 953		goto validate_pd_fail;
 954	}
 955	ret = amdgpu_bo_sync_wait(vm->root.base.bo,
 956				  AMDGPU_FENCE_OWNER_KFD, false);
 957	if (ret)
 958		goto wait_pd_fail;
 959	ret = dma_resv_reserve_shared(vm->root.base.bo->tbo.base.resv, 1);
 960	if (ret)
 961		goto reserve_shared_fail;
 962	amdgpu_bo_fence(vm->root.base.bo,
 963			&vm->process_info->eviction_fence->base, true);
 964	amdgpu_bo_unreserve(vm->root.base.bo);
 965
 966	/* Update process info */
 967	mutex_lock(&vm->process_info->lock);
 968	list_add_tail(&vm->vm_list_node,
 969			&(vm->process_info->vm_list_head));
 970	vm->process_info->n_vms++;
 971	mutex_unlock(&vm->process_info->lock);
 972
 973	return 0;
 974
 975reserve_shared_fail:
 976wait_pd_fail:
 977validate_pd_fail:
 978	amdgpu_bo_unreserve(vm->root.base.bo);
 979reserve_pd_fail:
 980	vm->process_info = NULL;
 981	if (info) {
 982		/* Two fence references: one in info and one in *ef */
 983		dma_fence_put(&info->eviction_fence->base);
 984		dma_fence_put(*ef);
 985		*ef = NULL;
 986		*process_info = NULL;
 987		put_pid(info->pid);
 988create_evict_fence_fail:
 989		mutex_destroy(&info->lock);
 990		kfree(info);
 991	}
 992	return ret;
 993}
 994
 995int amdgpu_amdkfd_gpuvm_create_process_vm(struct kgd_dev *kgd, unsigned int pasid,
 996					  void **vm, void **process_info,
 997					  struct dma_fence **ef)
 998{
 999	struct amdgpu_device *adev = get_amdgpu_device(kgd);
1000	struct amdgpu_vm *new_vm;
1001	int ret;
1002
1003	new_vm = kzalloc(sizeof(*new_vm), GFP_KERNEL);
1004	if (!new_vm)
1005		return -ENOMEM;
1006
1007	/* Initialize AMDGPU part of the VM */
1008	ret = amdgpu_vm_init(adev, new_vm, AMDGPU_VM_CONTEXT_COMPUTE, pasid);
1009	if (ret) {
1010		pr_err("Failed init vm ret %d\n", ret);
1011		goto amdgpu_vm_init_fail;
1012	}
1013
1014	/* Initialize KFD part of the VM and process info */
1015	ret = init_kfd_vm(new_vm, process_info, ef);
1016	if (ret)
1017		goto init_kfd_vm_fail;
1018
1019	*vm = (void *) new_vm;
1020
1021	return 0;
1022
1023init_kfd_vm_fail:
1024	amdgpu_vm_fini(adev, new_vm);
1025amdgpu_vm_init_fail:
1026	kfree(new_vm);
1027	return ret;
1028}
1029
1030int amdgpu_amdkfd_gpuvm_acquire_process_vm(struct kgd_dev *kgd,
1031					   struct file *filp, unsigned int pasid,
1032					   void **vm, void **process_info,
1033					   struct dma_fence **ef)
1034{
1035	struct amdgpu_device *adev = get_amdgpu_device(kgd);
1036	struct drm_file *drm_priv = filp->private_data;
1037	struct amdgpu_fpriv *drv_priv = drm_priv->driver_priv;
1038	struct amdgpu_vm *avm = &drv_priv->vm;
1039	int ret;
1040
1041	/* Already a compute VM? */
1042	if (avm->process_info)
1043		return -EINVAL;
1044
1045	/* Convert VM into a compute VM */
1046	ret = amdgpu_vm_make_compute(adev, avm, pasid);
1047	if (ret)
1048		return ret;
1049
1050	/* Initialize KFD part of the VM and process info */
1051	ret = init_kfd_vm(avm, process_info, ef);
1052	if (ret)
1053		return ret;
1054
1055	*vm = (void *)avm;
1056
1057	return 0;
1058}
1059
1060void amdgpu_amdkfd_gpuvm_destroy_cb(struct amdgpu_device *adev,
1061				    struct amdgpu_vm *vm)
1062{
1063	struct amdkfd_process_info *process_info = vm->process_info;
1064	struct amdgpu_bo *pd = vm->root.base.bo;
1065
1066	if (!process_info)
1067		return;
1068
1069	/* Release eviction fence from PD */
1070	amdgpu_bo_reserve(pd, false);
1071	amdgpu_bo_fence(pd, NULL, false);
1072	amdgpu_bo_unreserve(pd);
1073
1074	/* Update process info */
1075	mutex_lock(&process_info->lock);
1076	process_info->n_vms--;
1077	list_del(&vm->vm_list_node);
1078	mutex_unlock(&process_info->lock);
1079
1080	vm->process_info = NULL;
1081
1082	/* Release per-process resources when last compute VM is destroyed */
1083	if (!process_info->n_vms) {
1084		WARN_ON(!list_empty(&process_info->kfd_bo_list));
1085		WARN_ON(!list_empty(&process_info->userptr_valid_list));
1086		WARN_ON(!list_empty(&process_info->userptr_inval_list));
1087
1088		dma_fence_put(&process_info->eviction_fence->base);
1089		cancel_delayed_work_sync(&process_info->restore_userptr_work);
1090		put_pid(process_info->pid);
1091		mutex_destroy(&process_info->lock);
1092		kfree(process_info);
1093	}
1094}
1095
1096void amdgpu_amdkfd_gpuvm_destroy_process_vm(struct kgd_dev *kgd, void *vm)
1097{
1098	struct amdgpu_device *adev = get_amdgpu_device(kgd);
1099	struct amdgpu_vm *avm = (struct amdgpu_vm *)vm;
1100
1101	if (WARN_ON(!kgd || !vm))
1102		return;
1103
1104	pr_debug("Destroying process vm %p\n", vm);
1105
1106	/* Release the VM context */
1107	amdgpu_vm_fini(adev, avm);
1108	kfree(vm);
1109}
1110
1111void amdgpu_amdkfd_gpuvm_release_process_vm(struct kgd_dev *kgd, void *vm)
1112{
1113	struct amdgpu_device *adev = get_amdgpu_device(kgd);
1114        struct amdgpu_vm *avm = (struct amdgpu_vm *)vm;
1115
1116	if (WARN_ON(!kgd || !vm))
1117                return;
1118
1119        pr_debug("Releasing process vm %p\n", vm);
1120
1121        /* The original pasid of amdgpu vm has already been
1122         * released during making a amdgpu vm to a compute vm
1123         * The current pasid is managed by kfd and will be
1124         * released on kfd process destroy. Set amdgpu pasid
1125         * to 0 to avoid duplicate release.
1126         */
1127	amdgpu_vm_release_compute(adev, avm);
1128}
1129
1130uint64_t amdgpu_amdkfd_gpuvm_get_process_page_dir(void *vm)
1131{
1132	struct amdgpu_vm *avm = (struct amdgpu_vm *)vm;
1133	struct amdgpu_bo *pd = avm->root.base.bo;
1134	struct amdgpu_device *adev = amdgpu_ttm_adev(pd->tbo.bdev);
1135
1136	if (adev->asic_type < CHIP_VEGA10)
1137		return avm->pd_phys_addr >> AMDGPU_GPU_PAGE_SHIFT;
1138	return avm->pd_phys_addr;
1139}
1140
1141int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
1142		struct kgd_dev *kgd, uint64_t va, uint64_t size,
1143		void *vm, struct kgd_mem **mem,
1144		uint64_t *offset, uint32_t flags)
1145{
1146	struct amdgpu_device *adev = get_amdgpu_device(kgd);
1147	struct amdgpu_vm *avm = (struct amdgpu_vm *)vm;
1148	enum ttm_bo_type bo_type = ttm_bo_type_device;
1149	struct sg_table *sg = NULL;
1150	uint64_t user_addr = 0;
1151	struct amdgpu_bo *bo;
1152	struct amdgpu_bo_param bp;
 
1153	u32 domain, alloc_domain;
1154	u64 alloc_flags;
 
1155	int ret;
1156
1157	/*
1158	 * Check on which domain to allocate BO
1159	 */
1160	if (flags & KFD_IOC_ALLOC_MEM_FLAGS_VRAM) {
1161		domain = alloc_domain = AMDGPU_GEM_DOMAIN_VRAM;
1162		alloc_flags = AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE;
1163		alloc_flags |= (flags & KFD_IOC_ALLOC_MEM_FLAGS_PUBLIC) ?
1164			AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED :
1165			AMDGPU_GEM_CREATE_NO_CPU_ACCESS;
1166	} else if (flags & KFD_IOC_ALLOC_MEM_FLAGS_GTT) {
1167		domain = alloc_domain = AMDGPU_GEM_DOMAIN_GTT;
1168		alloc_flags = 0;
1169	} else if (flags & KFD_IOC_ALLOC_MEM_FLAGS_USERPTR) {
1170		domain = AMDGPU_GEM_DOMAIN_GTT;
1171		alloc_domain = AMDGPU_GEM_DOMAIN_CPU;
1172		alloc_flags = 0;
1173		if (!offset || !*offset)
1174			return -EINVAL;
1175		user_addr = untagged_addr(*offset);
1176	} else if (flags & (KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL |
1177			KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP)) {
1178		domain = AMDGPU_GEM_DOMAIN_GTT;
1179		alloc_domain = AMDGPU_GEM_DOMAIN_CPU;
1180		bo_type = ttm_bo_type_sg;
1181		alloc_flags = 0;
1182		if (size > UINT_MAX)
1183			return -EINVAL;
1184		sg = create_doorbell_sg(*offset, size);
1185		if (!sg)
1186			return -ENOMEM;
1187	} else {
1188		return -EINVAL;
1189	}
1190
1191	*mem = kzalloc(sizeof(struct kgd_mem), GFP_KERNEL);
1192	if (!*mem) {
1193		ret = -ENOMEM;
1194		goto err;
1195	}
1196	INIT_LIST_HEAD(&(*mem)->bo_va_list);
1197	mutex_init(&(*mem)->lock);
1198	(*mem)->aql_queue = !!(flags & KFD_IOC_ALLOC_MEM_FLAGS_AQL_QUEUE_MEM);
1199
1200	/* Workaround for AQL queue wraparound bug. Map the same
1201	 * memory twice. That means we only actually allocate half
1202	 * the memory.
1203	 */
1204	if ((*mem)->aql_queue)
1205		size = size >> 1;
1206
1207	(*mem)->alloc_flags = flags;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1208
1209	amdgpu_sync_create(&(*mem)->sync);
1210
1211	ret = amdgpu_amdkfd_reserve_mem_limit(adev, size, alloc_domain, !!sg);
1212	if (ret) {
1213		pr_debug("Insufficient system memory\n");
1214		goto err_reserve_limit;
1215	}
1216
1217	pr_debug("\tcreate BO VA 0x%llx size 0x%llx domain %s\n",
1218			va, size, domain_string(alloc_domain));
1219
1220	memset(&bp, 0, sizeof(bp));
1221	bp.size = size;
1222	bp.byte_align = 1;
1223	bp.domain = alloc_domain;
1224	bp.flags = alloc_flags;
1225	bp.type = bo_type;
1226	bp.resv = NULL;
1227	ret = amdgpu_bo_create(adev, &bp, &bo);
1228	if (ret) {
1229		pr_debug("Failed to create BO on domain %s. ret %d\n",
1230				domain_string(alloc_domain), ret);
1231		goto err_bo_create;
1232	}
1233	if (bo_type == ttm_bo_type_sg) {
1234		bo->tbo.sg = sg;
1235		bo->tbo.ttm->sg = sg;
1236	}
1237	bo->kfd_bo = *mem;
1238	(*mem)->bo = bo;
1239	if (user_addr)
1240		bo->flags |= AMDGPU_AMDKFD_USERPTR_BO;
1241
1242	(*mem)->va = va;
1243	(*mem)->domain = domain;
1244	(*mem)->mapped_to_gpu_memory = 0;
1245	(*mem)->process_info = avm->process_info;
1246	add_kgd_mem_to_kfd_bo_list(*mem, avm->process_info, user_addr);
1247
1248	if (user_addr) {
1249		ret = init_user_pages(*mem, user_addr);
1250		if (ret)
1251			goto allocate_init_user_pages_failed;
1252	}
1253
1254	if (offset)
1255		*offset = amdgpu_bo_mmap_offset(bo);
1256
1257	return 0;
1258
1259allocate_init_user_pages_failed:
1260	remove_kgd_mem_from_kfd_bo_list(*mem, avm->process_info);
1261	amdgpu_bo_unref(&bo);
1262	/* Don't unreserve system mem limit twice */
1263	goto err_reserve_limit;
1264err_bo_create:
1265	unreserve_mem_limit(adev, size, alloc_domain, !!sg);
1266err_reserve_limit:
1267	mutex_destroy(&(*mem)->lock);
1268	kfree(*mem);
1269err:
1270	if (sg) {
1271		sg_free_table(sg);
1272		kfree(sg);
1273	}
1274	return ret;
1275}
1276
1277int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
1278		struct kgd_dev *kgd, struct kgd_mem *mem, uint64_t *size)
1279{
1280	struct amdkfd_process_info *process_info = mem->process_info;
1281	unsigned long bo_size = mem->bo->tbo.mem.size;
1282	struct kfd_bo_va_list *entry, *tmp;
1283	struct bo_vm_reservation_context ctx;
1284	struct ttm_validate_buffer *bo_list_entry;
1285	unsigned int mapped_to_gpu_memory;
1286	int ret;
1287	bool is_imported = 0;
1288
1289	mutex_lock(&mem->lock);
1290	mapped_to_gpu_memory = mem->mapped_to_gpu_memory;
1291	is_imported = mem->is_imported;
1292	mutex_unlock(&mem->lock);
1293	/* lock is not needed after this, since mem is unused and will
1294	 * be freed anyway
1295	 */
1296
1297	if (mapped_to_gpu_memory > 0) {
1298		pr_debug("BO VA 0x%llx size 0x%lx is still mapped.\n",
1299				mem->va, bo_size);
 
1300		return -EBUSY;
1301	}
1302
 
 
 
 
 
 
 
 
1303	/* Make sure restore workers don't access the BO any more */
1304	bo_list_entry = &mem->validate_list;
1305	mutex_lock(&process_info->lock);
1306	list_del(&bo_list_entry->head);
1307	mutex_unlock(&process_info->lock);
1308
1309	/* No more MMU notifiers */
1310	amdgpu_mn_unregister(mem->bo);
1311
1312	ret = reserve_bo_and_cond_vms(mem, NULL, BO_VM_ALL, &ctx);
1313	if (unlikely(ret))
1314		return ret;
1315
1316	/* The eviction fence should be removed by the last unmap.
1317	 * TODO: Log an error condition if the bo still has the eviction fence
1318	 * attached
1319	 */
1320	amdgpu_amdkfd_remove_eviction_fence(mem->bo,
1321					process_info->eviction_fence);
1322	pr_debug("Release VA 0x%llx - 0x%llx\n", mem->va,
1323		mem->va + bo_size * (1 + mem->aql_queue));
1324
1325	/* Remove from VM internal data structures */
1326	list_for_each_entry_safe(entry, tmp, &mem->bo_va_list, bo_list)
1327		remove_bo_from_vm((struct amdgpu_device *)entry->kgd_dev,
1328				entry, bo_size);
1329
1330	ret = unreserve_bo_and_vms(&ctx, false, false);
1331
1332	/* Free the sync object */
1333	amdgpu_sync_free(&mem->sync);
1334
1335	/* If the SG is not NULL, it's one we created for a doorbell or mmio
1336	 * remap BO. We need to free it.
1337	 */
1338	if (mem->bo->tbo.sg) {
1339		sg_free_table(mem->bo->tbo.sg);
1340		kfree(mem->bo->tbo.sg);
1341	}
1342
1343	/* Update the size of the BO being freed if it was allocated from
1344	 * VRAM and is not imported.
1345	 */
1346	if (size) {
1347		if ((mem->bo->preferred_domains == AMDGPU_GEM_DOMAIN_VRAM) &&
1348		    (!is_imported))
1349			*size = bo_size;
1350		else
1351			*size = 0;
1352	}
1353
1354	/* Free the BO*/
1355	drm_gem_object_put(&mem->bo->tbo.base);
1356	mutex_destroy(&mem->lock);
1357	kfree(mem);
1358
1359	return ret;
1360}
1361
1362int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
1363		struct kgd_dev *kgd, struct kgd_mem *mem, void *vm)
1364{
1365	struct amdgpu_device *adev = get_amdgpu_device(kgd);
1366	struct amdgpu_vm *avm = (struct amdgpu_vm *)vm;
1367	int ret;
1368	struct amdgpu_bo *bo;
1369	uint32_t domain;
1370	struct kfd_bo_va_list *entry;
1371	struct bo_vm_reservation_context ctx;
1372	struct kfd_bo_va_list *bo_va_entry = NULL;
1373	struct kfd_bo_va_list *bo_va_entry_aql = NULL;
1374	unsigned long bo_size;
1375	bool is_invalid_userptr = false;
1376
1377	bo = mem->bo;
1378	if (!bo) {
1379		pr_err("Invalid BO when mapping memory to GPU\n");
1380		return -EINVAL;
1381	}
1382
1383	/* Make sure restore is not running concurrently. Since we
1384	 * don't map invalid userptr BOs, we rely on the next restore
1385	 * worker to do the mapping
1386	 */
1387	mutex_lock(&mem->process_info->lock);
1388
1389	/* Lock mmap-sem. If we find an invalid userptr BO, we can be
1390	 * sure that the MMU notifier is no longer running
1391	 * concurrently and the queues are actually stopped
1392	 */
1393	if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm)) {
1394		mmap_write_lock(current->mm);
1395		is_invalid_userptr = atomic_read(&mem->invalid);
1396		mmap_write_unlock(current->mm);
1397	}
1398
1399	mutex_lock(&mem->lock);
1400
1401	domain = mem->domain;
1402	bo_size = bo->tbo.mem.size;
1403
1404	pr_debug("Map VA 0x%llx - 0x%llx to vm %p domain %s\n",
1405			mem->va,
1406			mem->va + bo_size * (1 + mem->aql_queue),
1407			vm, domain_string(domain));
1408
1409	ret = reserve_bo_and_vm(mem, vm, &ctx);
1410	if (unlikely(ret))
1411		goto out;
1412
1413	/* Userptr can be marked as "not invalid", but not actually be
1414	 * validated yet (still in the system domain). In that case
1415	 * the queues are still stopped and we can leave mapping for
1416	 * the next restore worker
1417	 */
1418	if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) &&
1419	    bo->tbo.mem.mem_type == TTM_PL_SYSTEM)
1420		is_invalid_userptr = true;
1421
1422	if (check_if_add_bo_to_vm(avm, mem)) {
1423		ret = add_bo_to_vm(adev, mem, avm, false,
1424				&bo_va_entry);
1425		if (ret)
1426			goto add_bo_to_vm_failed;
1427		if (mem->aql_queue) {
1428			ret = add_bo_to_vm(adev, mem, avm,
1429					true, &bo_va_entry_aql);
1430			if (ret)
1431				goto add_bo_to_vm_failed_aql;
1432		}
1433	} else {
1434		ret = vm_validate_pt_pd_bos(avm);
1435		if (unlikely(ret))
1436			goto add_bo_to_vm_failed;
1437	}
1438
1439	if (mem->mapped_to_gpu_memory == 0 &&
1440	    !amdgpu_ttm_tt_get_usermm(bo->tbo.ttm)) {
1441		/* Validate BO only once. The eviction fence gets added to BO
1442		 * the first time it is mapped. Validate will wait for all
1443		 * background evictions to complete.
1444		 */
1445		ret = amdgpu_amdkfd_bo_validate(bo, domain, true);
1446		if (ret) {
1447			pr_debug("Validate failed\n");
1448			goto map_bo_to_gpuvm_failed;
1449		}
1450	}
1451
1452	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
1453		if (entry->bo_va->base.vm == vm && !entry->is_mapped) {
1454			pr_debug("\t map VA 0x%llx - 0x%llx in entry %p\n",
1455					entry->va, entry->va + bo_size,
1456					entry);
1457
1458			ret = map_bo_to_gpuvm(adev, entry, ctx.sync,
1459					      is_invalid_userptr);
1460			if (ret) {
1461				pr_err("Failed to map bo to gpuvm\n");
1462				goto map_bo_to_gpuvm_failed;
1463			}
1464
1465			ret = vm_update_pds(vm, ctx.sync);
1466			if (ret) {
1467				pr_err("Failed to update page directories\n");
1468				goto map_bo_to_gpuvm_failed;
1469			}
1470
1471			entry->is_mapped = true;
1472			mem->mapped_to_gpu_memory++;
1473			pr_debug("\t INC mapping count %d\n",
1474					mem->mapped_to_gpu_memory);
1475		}
1476	}
1477
1478	if (!amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) && !bo->pin_count)
1479		amdgpu_bo_fence(bo,
1480				&avm->process_info->eviction_fence->base,
1481				true);
1482	ret = unreserve_bo_and_vms(&ctx, false, false);
1483
1484	goto out;
1485
1486map_bo_to_gpuvm_failed:
1487	if (bo_va_entry_aql)
1488		remove_bo_from_vm(adev, bo_va_entry_aql, bo_size);
1489add_bo_to_vm_failed_aql:
1490	if (bo_va_entry)
1491		remove_bo_from_vm(adev, bo_va_entry, bo_size);
1492add_bo_to_vm_failed:
1493	unreserve_bo_and_vms(&ctx, false, false);
1494out:
1495	mutex_unlock(&mem->process_info->lock);
1496	mutex_unlock(&mem->lock);
1497	return ret;
1498}
1499
1500int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
1501		struct kgd_dev *kgd, struct kgd_mem *mem, void *vm)
1502{
1503	struct amdgpu_device *adev = get_amdgpu_device(kgd);
1504	struct amdkfd_process_info *process_info =
1505		((struct amdgpu_vm *)vm)->process_info;
1506	unsigned long bo_size = mem->bo->tbo.mem.size;
1507	struct kfd_bo_va_list *entry;
1508	struct bo_vm_reservation_context ctx;
1509	int ret;
1510
1511	mutex_lock(&mem->lock);
1512
1513	ret = reserve_bo_and_cond_vms(mem, vm, BO_VM_MAPPED, &ctx);
1514	if (unlikely(ret))
1515		goto out;
1516	/* If no VMs were reserved, it means the BO wasn't actually mapped */
1517	if (ctx.n_vms == 0) {
1518		ret = -EINVAL;
1519		goto unreserve_out;
1520	}
1521
1522	ret = vm_validate_pt_pd_bos((struct amdgpu_vm *)vm);
1523	if (unlikely(ret))
1524		goto unreserve_out;
1525
1526	pr_debug("Unmap VA 0x%llx - 0x%llx from vm %p\n",
1527		mem->va,
1528		mem->va + bo_size * (1 + mem->aql_queue),
1529		vm);
1530
1531	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
1532		if (entry->bo_va->base.vm == vm && entry->is_mapped) {
1533			pr_debug("\t unmap VA 0x%llx - 0x%llx from entry %p\n",
1534					entry->va,
1535					entry->va + bo_size,
1536					entry);
1537
1538			ret = unmap_bo_from_gpuvm(adev, entry, ctx.sync);
1539			if (ret == 0) {
1540				entry->is_mapped = false;
1541			} else {
1542				pr_err("failed to unmap VA 0x%llx\n",
1543						mem->va);
1544				goto unreserve_out;
1545			}
1546
1547			mem->mapped_to_gpu_memory--;
1548			pr_debug("\t DEC mapping count %d\n",
1549					mem->mapped_to_gpu_memory);
1550		}
1551	}
1552
1553	/* If BO is unmapped from all VMs, unfence it. It can be evicted if
1554	 * required.
1555	 */
1556	if (mem->mapped_to_gpu_memory == 0 &&
1557	    !amdgpu_ttm_tt_get_usermm(mem->bo->tbo.ttm) && !mem->bo->pin_count)
1558		amdgpu_amdkfd_remove_eviction_fence(mem->bo,
1559						process_info->eviction_fence);
1560
1561unreserve_out:
1562	unreserve_bo_and_vms(&ctx, false, false);
1563out:
1564	mutex_unlock(&mem->lock);
1565	return ret;
1566}
1567
1568int amdgpu_amdkfd_gpuvm_sync_memory(
1569		struct kgd_dev *kgd, struct kgd_mem *mem, bool intr)
1570{
1571	struct amdgpu_sync sync;
1572	int ret;
1573
1574	amdgpu_sync_create(&sync);
1575
1576	mutex_lock(&mem->lock);
1577	amdgpu_sync_clone(&mem->sync, &sync);
1578	mutex_unlock(&mem->lock);
1579
1580	ret = amdgpu_sync_wait(&sync, intr);
1581	amdgpu_sync_free(&sync);
1582	return ret;
1583}
1584
1585int amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(struct kgd_dev *kgd,
1586		struct kgd_mem *mem, void **kptr, uint64_t *size)
1587{
1588	int ret;
1589	struct amdgpu_bo *bo = mem->bo;
1590
1591	if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm)) {
1592		pr_err("userptr can't be mapped to kernel\n");
1593		return -EINVAL;
1594	}
1595
1596	/* delete kgd_mem from kfd_bo_list to avoid re-validating
1597	 * this BO in BO's restoring after eviction.
1598	 */
1599	mutex_lock(&mem->process_info->lock);
1600
1601	ret = amdgpu_bo_reserve(bo, true);
1602	if (ret) {
1603		pr_err("Failed to reserve bo. ret %d\n", ret);
1604		goto bo_reserve_failed;
1605	}
1606
1607	ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
1608	if (ret) {
1609		pr_err("Failed to pin bo. ret %d\n", ret);
1610		goto pin_failed;
1611	}
1612
1613	ret = amdgpu_bo_kmap(bo, kptr);
1614	if (ret) {
1615		pr_err("Failed to map bo to kernel. ret %d\n", ret);
1616		goto kmap_failed;
1617	}
1618
1619	amdgpu_amdkfd_remove_eviction_fence(
1620		bo, mem->process_info->eviction_fence);
1621	list_del_init(&mem->validate_list.head);
1622
1623	if (size)
1624		*size = amdgpu_bo_size(bo);
1625
1626	amdgpu_bo_unreserve(bo);
1627
1628	mutex_unlock(&mem->process_info->lock);
1629	return 0;
1630
1631kmap_failed:
1632	amdgpu_bo_unpin(bo);
1633pin_failed:
1634	amdgpu_bo_unreserve(bo);
1635bo_reserve_failed:
1636	mutex_unlock(&mem->process_info->lock);
1637
1638	return ret;
1639}
1640
1641int amdgpu_amdkfd_gpuvm_get_vm_fault_info(struct kgd_dev *kgd,
1642					      struct kfd_vm_fault_info *mem)
1643{
1644	struct amdgpu_device *adev;
1645
1646	adev = (struct amdgpu_device *)kgd;
1647	if (atomic_read(&adev->gmc.vm_fault_info_updated) == 1) {
1648		*mem = *adev->gmc.vm_fault_info;
1649		mb();
1650		atomic_set(&adev->gmc.vm_fault_info_updated, 0);
1651	}
1652	return 0;
1653}
1654
1655int amdgpu_amdkfd_gpuvm_import_dmabuf(struct kgd_dev *kgd,
1656				      struct dma_buf *dma_buf,
1657				      uint64_t va, void *vm,
1658				      struct kgd_mem **mem, uint64_t *size,
1659				      uint64_t *mmap_offset)
1660{
1661	struct amdgpu_device *adev = (struct amdgpu_device *)kgd;
1662	struct drm_gem_object *obj;
1663	struct amdgpu_bo *bo;
1664	struct amdgpu_vm *avm = (struct amdgpu_vm *)vm;
1665
1666	if (dma_buf->ops != &amdgpu_dmabuf_ops)
1667		/* Can't handle non-graphics buffers */
1668		return -EINVAL;
1669
1670	obj = dma_buf->priv;
1671	if (obj->dev->dev_private != adev)
1672		/* Can't handle buffers from other devices */
1673		return -EINVAL;
1674
1675	bo = gem_to_amdgpu_bo(obj);
1676	if (!(bo->preferred_domains & (AMDGPU_GEM_DOMAIN_VRAM |
1677				    AMDGPU_GEM_DOMAIN_GTT)))
1678		/* Only VRAM and GTT BOs are supported */
1679		return -EINVAL;
1680
1681	*mem = kzalloc(sizeof(struct kgd_mem), GFP_KERNEL);
1682	if (!*mem)
1683		return -ENOMEM;
1684
1685	if (size)
1686		*size = amdgpu_bo_size(bo);
1687
1688	if (mmap_offset)
1689		*mmap_offset = amdgpu_bo_mmap_offset(bo);
1690
1691	INIT_LIST_HEAD(&(*mem)->bo_va_list);
1692	mutex_init(&(*mem)->lock);
1693	
1694	(*mem)->alloc_flags =
1695		((bo->preferred_domains & AMDGPU_GEM_DOMAIN_VRAM) ?
1696		KFD_IOC_ALLOC_MEM_FLAGS_VRAM : KFD_IOC_ALLOC_MEM_FLAGS_GTT)
1697		| KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE
1698		| KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE;
1699
1700	drm_gem_object_get(&bo->tbo.base);
1701	(*mem)->bo = bo;
1702	(*mem)->va = va;
1703	(*mem)->domain = (bo->preferred_domains & AMDGPU_GEM_DOMAIN_VRAM) ?
1704		AMDGPU_GEM_DOMAIN_VRAM : AMDGPU_GEM_DOMAIN_GTT;
1705	(*mem)->mapped_to_gpu_memory = 0;
1706	(*mem)->process_info = avm->process_info;
1707	add_kgd_mem_to_kfd_bo_list(*mem, avm->process_info, false);
1708	amdgpu_sync_create(&(*mem)->sync);
1709	(*mem)->is_imported = true;
1710
1711	return 0;
1712}
1713
1714/* Evict a userptr BO by stopping the queues if necessary
1715 *
1716 * Runs in MMU notifier, may be in RECLAIM_FS context. This means it
1717 * cannot do any memory allocations, and cannot take any locks that
1718 * are held elsewhere while allocating memory. Therefore this is as
1719 * simple as possible, using atomic counters.
1720 *
1721 * It doesn't do anything to the BO itself. The real work happens in
1722 * restore, where we get updated page addresses. This function only
1723 * ensures that GPU access to the BO is stopped.
1724 */
1725int amdgpu_amdkfd_evict_userptr(struct kgd_mem *mem,
1726				struct mm_struct *mm)
1727{
1728	struct amdkfd_process_info *process_info = mem->process_info;
1729	int evicted_bos;
1730	int r = 0;
1731
1732	atomic_inc(&mem->invalid);
1733	evicted_bos = atomic_inc_return(&process_info->evicted_bos);
1734	if (evicted_bos == 1) {
1735		/* First eviction, stop the queues */
1736		r = kgd2kfd_quiesce_mm(mm);
1737		if (r)
1738			pr_err("Failed to quiesce KFD\n");
1739		schedule_delayed_work(&process_info->restore_userptr_work,
1740			msecs_to_jiffies(AMDGPU_USERPTR_RESTORE_DELAY_MS));
1741	}
1742
1743	return r;
1744}
1745
1746/* Update invalid userptr BOs
1747 *
1748 * Moves invalidated (evicted) userptr BOs from userptr_valid_list to
1749 * userptr_inval_list and updates user pages for all BOs that have
1750 * been invalidated since their last update.
1751 */
1752static int update_invalid_user_pages(struct amdkfd_process_info *process_info,
1753				     struct mm_struct *mm)
1754{
1755	struct kgd_mem *mem, *tmp_mem;
1756	struct amdgpu_bo *bo;
1757	struct ttm_operation_ctx ctx = { false, false };
1758	int invalid, ret;
1759
1760	/* Move all invalidated BOs to the userptr_inval_list and
1761	 * release their user pages by migration to the CPU domain
1762	 */
1763	list_for_each_entry_safe(mem, tmp_mem,
1764				 &process_info->userptr_valid_list,
1765				 validate_list.head) {
1766		if (!atomic_read(&mem->invalid))
1767			continue; /* BO is still valid */
1768
1769		bo = mem->bo;
1770
1771		if (amdgpu_bo_reserve(bo, true))
1772			return -EAGAIN;
1773		amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
1774		ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
1775		amdgpu_bo_unreserve(bo);
1776		if (ret) {
1777			pr_err("%s: Failed to invalidate userptr BO\n",
1778			       __func__);
1779			return -EAGAIN;
1780		}
1781
1782		list_move_tail(&mem->validate_list.head,
1783			       &process_info->userptr_inval_list);
1784	}
1785
1786	if (list_empty(&process_info->userptr_inval_list))
1787		return 0; /* All evicted userptr BOs were freed */
1788
1789	/* Go through userptr_inval_list and update any invalid user_pages */
1790	list_for_each_entry(mem, &process_info->userptr_inval_list,
1791			    validate_list.head) {
1792		invalid = atomic_read(&mem->invalid);
1793		if (!invalid)
1794			/* BO hasn't been invalidated since the last
1795			 * revalidation attempt. Keep its BO list.
1796			 */
1797			continue;
1798
1799		bo = mem->bo;
1800
1801		/* Get updated user pages */
1802		ret = amdgpu_ttm_tt_get_user_pages(bo, bo->tbo.ttm->pages);
1803		if (ret) {
1804			pr_debug("%s: Failed to get user pages: %d\n",
1805				__func__, ret);
1806
1807			/* Return error -EBUSY or -ENOMEM, retry restore */
1808			return ret;
1809		}
1810
1811		/*
1812		 * FIXME: Cannot ignore the return code, must hold
1813		 * notifier_lock
1814		 */
1815		amdgpu_ttm_tt_get_user_pages_done(bo->tbo.ttm);
1816
1817		/* Mark the BO as valid unless it was invalidated
1818		 * again concurrently.
1819		 */
1820		if (atomic_cmpxchg(&mem->invalid, invalid, 0) != invalid)
1821			return -EAGAIN;
1822	}
1823
1824	return 0;
1825}
1826
1827/* Validate invalid userptr BOs
1828 *
1829 * Validates BOs on the userptr_inval_list, and moves them back to the
1830 * userptr_valid_list. Also updates GPUVM page tables with new page
1831 * addresses and waits for the page table updates to complete.
1832 */
1833static int validate_invalid_user_pages(struct amdkfd_process_info *process_info)
1834{
1835	struct amdgpu_bo_list_entry *pd_bo_list_entries;
1836	struct list_head resv_list, duplicates;
1837	struct ww_acquire_ctx ticket;
1838	struct amdgpu_sync sync;
1839
1840	struct amdgpu_vm *peer_vm;
1841	struct kgd_mem *mem, *tmp_mem;
1842	struct amdgpu_bo *bo;
1843	struct ttm_operation_ctx ctx = { false, false };
1844	int i, ret;
1845
1846	pd_bo_list_entries = kcalloc(process_info->n_vms,
1847				     sizeof(struct amdgpu_bo_list_entry),
1848				     GFP_KERNEL);
1849	if (!pd_bo_list_entries) {
1850		pr_err("%s: Failed to allocate PD BO list entries\n", __func__);
1851		ret = -ENOMEM;
1852		goto out_no_mem;
1853	}
1854
1855	INIT_LIST_HEAD(&resv_list);
1856	INIT_LIST_HEAD(&duplicates);
1857
1858	/* Get all the page directory BOs that need to be reserved */
1859	i = 0;
1860	list_for_each_entry(peer_vm, &process_info->vm_list_head,
1861			    vm_list_node)
1862		amdgpu_vm_get_pd_bo(peer_vm, &resv_list,
1863				    &pd_bo_list_entries[i++]);
1864	/* Add the userptr_inval_list entries to resv_list */
1865	list_for_each_entry(mem, &process_info->userptr_inval_list,
1866			    validate_list.head) {
1867		list_add_tail(&mem->resv_list.head, &resv_list);
1868		mem->resv_list.bo = mem->validate_list.bo;
1869		mem->resv_list.num_shared = mem->validate_list.num_shared;
1870	}
1871
1872	/* Reserve all BOs and page tables for validation */
1873	ret = ttm_eu_reserve_buffers(&ticket, &resv_list, false, &duplicates);
 
1874	WARN(!list_empty(&duplicates), "Duplicates should be empty");
1875	if (ret)
1876		goto out_free;
1877
1878	amdgpu_sync_create(&sync);
1879
1880	ret = process_validate_vms(process_info);
1881	if (ret)
1882		goto unreserve_out;
1883
1884	/* Validate BOs and update GPUVM page tables */
1885	list_for_each_entry_safe(mem, tmp_mem,
1886				 &process_info->userptr_inval_list,
1887				 validate_list.head) {
1888		struct kfd_bo_va_list *bo_va_entry;
1889
1890		bo = mem->bo;
1891
1892		/* Validate the BO if we got user pages */
1893		if (bo->tbo.ttm->pages[0]) {
1894			amdgpu_bo_placement_from_domain(bo, mem->domain);
1895			ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
1896			if (ret) {
1897				pr_err("%s: failed to validate BO\n", __func__);
1898				goto unreserve_out;
1899			}
1900		}
1901
1902		list_move_tail(&mem->validate_list.head,
1903			       &process_info->userptr_valid_list);
1904
1905		/* Update mapping. If the BO was not validated
1906		 * (because we couldn't get user pages), this will
1907		 * clear the page table entries, which will result in
1908		 * VM faults if the GPU tries to access the invalid
1909		 * memory.
1910		 */
1911		list_for_each_entry(bo_va_entry, &mem->bo_va_list, bo_list) {
1912			if (!bo_va_entry->is_mapped)
1913				continue;
1914
1915			ret = update_gpuvm_pte((struct amdgpu_device *)
1916					       bo_va_entry->kgd_dev,
1917					       bo_va_entry, &sync);
1918			if (ret) {
1919				pr_err("%s: update PTE failed\n", __func__);
1920				/* make sure this gets validated again */
1921				atomic_inc(&mem->invalid);
1922				goto unreserve_out;
1923			}
1924		}
1925	}
1926
1927	/* Update page directories */
1928	ret = process_update_pds(process_info, &sync);
1929
1930unreserve_out:
1931	ttm_eu_backoff_reservation(&ticket, &resv_list);
1932	amdgpu_sync_wait(&sync, false);
1933	amdgpu_sync_free(&sync);
1934out_free:
1935	kfree(pd_bo_list_entries);
1936out_no_mem:
1937
1938	return ret;
1939}
1940
1941/* Worker callback to restore evicted userptr BOs
1942 *
1943 * Tries to update and validate all userptr BOs. If successful and no
1944 * concurrent evictions happened, the queues are restarted. Otherwise,
1945 * reschedule for another attempt later.
1946 */
1947static void amdgpu_amdkfd_restore_userptr_worker(struct work_struct *work)
1948{
1949	struct delayed_work *dwork = to_delayed_work(work);
1950	struct amdkfd_process_info *process_info =
1951		container_of(dwork, struct amdkfd_process_info,
1952			     restore_userptr_work);
1953	struct task_struct *usertask;
1954	struct mm_struct *mm;
1955	int evicted_bos;
1956
1957	evicted_bos = atomic_read(&process_info->evicted_bos);
1958	if (!evicted_bos)
1959		return;
1960
1961	/* Reference task and mm in case of concurrent process termination */
1962	usertask = get_pid_task(process_info->pid, PIDTYPE_PID);
1963	if (!usertask)
1964		return;
1965	mm = get_task_mm(usertask);
1966	if (!mm) {
1967		put_task_struct(usertask);
1968		return;
1969	}
1970
1971	mutex_lock(&process_info->lock);
1972
1973	if (update_invalid_user_pages(process_info, mm))
1974		goto unlock_out;
1975	/* userptr_inval_list can be empty if all evicted userptr BOs
1976	 * have been freed. In that case there is nothing to validate
1977	 * and we can just restart the queues.
1978	 */
1979	if (!list_empty(&process_info->userptr_inval_list)) {
1980		if (atomic_read(&process_info->evicted_bos) != evicted_bos)
1981			goto unlock_out; /* Concurrent eviction, try again */
1982
1983		if (validate_invalid_user_pages(process_info))
1984			goto unlock_out;
1985	}
1986	/* Final check for concurrent evicton and atomic update. If
1987	 * another eviction happens after successful update, it will
1988	 * be a first eviction that calls quiesce_mm. The eviction
1989	 * reference counting inside KFD will handle this case.
1990	 */
1991	if (atomic_cmpxchg(&process_info->evicted_bos, evicted_bos, 0) !=
1992	    evicted_bos)
1993		goto unlock_out;
1994	evicted_bos = 0;
1995	if (kgd2kfd_resume_mm(mm)) {
1996		pr_err("%s: Failed to resume KFD\n", __func__);
1997		/* No recovery from this failure. Probably the CP is
1998		 * hanging. No point trying again.
1999		 */
2000	}
2001
2002unlock_out:
2003	mutex_unlock(&process_info->lock);
2004	mmput(mm);
2005	put_task_struct(usertask);
2006
2007	/* If validation failed, reschedule another attempt */
2008	if (evicted_bos)
2009		schedule_delayed_work(&process_info->restore_userptr_work,
2010			msecs_to_jiffies(AMDGPU_USERPTR_RESTORE_DELAY_MS));
2011}
2012
2013/** amdgpu_amdkfd_gpuvm_restore_process_bos - Restore all BOs for the given
2014 *   KFD process identified by process_info
2015 *
2016 * @process_info: amdkfd_process_info of the KFD process
2017 *
2018 * After memory eviction, restore thread calls this function. The function
2019 * should be called when the Process is still valid. BO restore involves -
2020 *
2021 * 1.  Release old eviction fence and create new one
2022 * 2.  Get two copies of PD BO list from all the VMs. Keep one copy as pd_list.
2023 * 3   Use the second PD list and kfd_bo_list to create a list (ctx.list) of
2024 *     BOs that need to be reserved.
2025 * 4.  Reserve all the BOs
2026 * 5.  Validate of PD and PT BOs.
2027 * 6.  Validate all KFD BOs using kfd_bo_list and Map them and add new fence
2028 * 7.  Add fence to all PD and PT BOs.
2029 * 8.  Unreserve all BOs
2030 */
2031int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef)
2032{
2033	struct amdgpu_bo_list_entry *pd_bo_list;
2034	struct amdkfd_process_info *process_info = info;
2035	struct amdgpu_vm *peer_vm;
2036	struct kgd_mem *mem;
2037	struct bo_vm_reservation_context ctx;
2038	struct amdgpu_amdkfd_fence *new_fence;
2039	int ret = 0, i;
2040	struct list_head duplicate_save;
2041	struct amdgpu_sync sync_obj;
2042
2043	INIT_LIST_HEAD(&duplicate_save);
2044	INIT_LIST_HEAD(&ctx.list);
2045	INIT_LIST_HEAD(&ctx.duplicates);
2046
2047	pd_bo_list = kcalloc(process_info->n_vms,
2048			     sizeof(struct amdgpu_bo_list_entry),
2049			     GFP_KERNEL);
2050	if (!pd_bo_list)
2051		return -ENOMEM;
2052
2053	i = 0;
2054	mutex_lock(&process_info->lock);
2055	list_for_each_entry(peer_vm, &process_info->vm_list_head,
2056			vm_list_node)
2057		amdgpu_vm_get_pd_bo(peer_vm, &ctx.list, &pd_bo_list[i++]);
2058
2059	/* Reserve all BOs and page tables/directory. Add all BOs from
2060	 * kfd_bo_list to ctx.list
2061	 */
2062	list_for_each_entry(mem, &process_info->kfd_bo_list,
2063			    validate_list.head) {
2064
2065		list_add_tail(&mem->resv_list.head, &ctx.list);
2066		mem->resv_list.bo = mem->validate_list.bo;
2067		mem->resv_list.num_shared = mem->validate_list.num_shared;
2068	}
2069
2070	ret = ttm_eu_reserve_buffers(&ctx.ticket, &ctx.list,
2071				     false, &duplicate_save);
2072	if (ret) {
2073		pr_debug("Memory eviction: TTM Reserve Failed. Try again\n");
2074		goto ttm_reserve_fail;
2075	}
2076
2077	amdgpu_sync_create(&sync_obj);
2078
2079	/* Validate PDs and PTs */
2080	ret = process_validate_vms(process_info);
2081	if (ret)
2082		goto validate_map_fail;
2083
2084	ret = process_sync_pds_resv(process_info, &sync_obj);
2085	if (ret) {
2086		pr_debug("Memory eviction: Failed to sync to PD BO moving fence. Try again\n");
2087		goto validate_map_fail;
2088	}
2089
2090	/* Validate BOs and map them to GPUVM (update VM page tables). */
2091	list_for_each_entry(mem, &process_info->kfd_bo_list,
2092			    validate_list.head) {
2093
2094		struct amdgpu_bo *bo = mem->bo;
2095		uint32_t domain = mem->domain;
2096		struct kfd_bo_va_list *bo_va_entry;
2097
2098		ret = amdgpu_amdkfd_bo_validate(bo, domain, false);
2099		if (ret) {
2100			pr_debug("Memory eviction: Validate BOs failed. Try again\n");
2101			goto validate_map_fail;
2102		}
2103		ret = amdgpu_sync_fence(&sync_obj, bo->tbo.moving);
2104		if (ret) {
2105			pr_debug("Memory eviction: Sync BO fence failed. Try again\n");
2106			goto validate_map_fail;
2107		}
2108		list_for_each_entry(bo_va_entry, &mem->bo_va_list,
2109				    bo_list) {
2110			ret = update_gpuvm_pte((struct amdgpu_device *)
2111					      bo_va_entry->kgd_dev,
2112					      bo_va_entry,
2113					      &sync_obj);
2114			if (ret) {
2115				pr_debug("Memory eviction: update PTE failed. Try again\n");
2116				goto validate_map_fail;
2117			}
2118		}
2119	}
2120
2121	/* Update page directories */
2122	ret = process_update_pds(process_info, &sync_obj);
2123	if (ret) {
2124		pr_debug("Memory eviction: update PDs failed. Try again\n");
2125		goto validate_map_fail;
2126	}
2127
2128	/* Wait for validate and PT updates to finish */
2129	amdgpu_sync_wait(&sync_obj, false);
2130
2131	/* Release old eviction fence and create new one, because fence only
2132	 * goes from unsignaled to signaled, fence cannot be reused.
2133	 * Use context and mm from the old fence.
2134	 */
2135	new_fence = amdgpu_amdkfd_fence_create(
2136				process_info->eviction_fence->base.context,
2137				process_info->eviction_fence->mm);
2138	if (!new_fence) {
2139		pr_err("Failed to create eviction fence\n");
2140		ret = -ENOMEM;
2141		goto validate_map_fail;
2142	}
2143	dma_fence_put(&process_info->eviction_fence->base);
2144	process_info->eviction_fence = new_fence;
2145	*ef = dma_fence_get(&new_fence->base);
2146
2147	/* Attach new eviction fence to all BOs */
2148	list_for_each_entry(mem, &process_info->kfd_bo_list,
2149		validate_list.head)
2150		amdgpu_bo_fence(mem->bo,
2151			&process_info->eviction_fence->base, true);
2152
2153	/* Attach eviction fence to PD / PT BOs */
2154	list_for_each_entry(peer_vm, &process_info->vm_list_head,
2155			    vm_list_node) {
2156		struct amdgpu_bo *bo = peer_vm->root.base.bo;
2157
2158		amdgpu_bo_fence(bo, &process_info->eviction_fence->base, true);
2159	}
2160
2161validate_map_fail:
2162	ttm_eu_backoff_reservation(&ctx.ticket, &ctx.list);
2163	amdgpu_sync_free(&sync_obj);
2164ttm_reserve_fail:
2165	mutex_unlock(&process_info->lock);
2166	kfree(pd_bo_list);
2167	return ret;
2168}
2169
2170int amdgpu_amdkfd_add_gws_to_process(void *info, void *gws, struct kgd_mem **mem)
2171{
2172	struct amdkfd_process_info *process_info = (struct amdkfd_process_info *)info;
2173	struct amdgpu_bo *gws_bo = (struct amdgpu_bo *)gws;
2174	int ret;
2175
2176	if (!info || !gws)
2177		return -EINVAL;
2178
2179	*mem = kzalloc(sizeof(struct kgd_mem), GFP_KERNEL);
2180	if (!*mem)
2181		return -ENOMEM;
2182
2183	mutex_init(&(*mem)->lock);
2184	INIT_LIST_HEAD(&(*mem)->bo_va_list);
2185	(*mem)->bo = amdgpu_bo_ref(gws_bo);
2186	(*mem)->domain = AMDGPU_GEM_DOMAIN_GWS;
2187	(*mem)->process_info = process_info;
2188	add_kgd_mem_to_kfd_bo_list(*mem, process_info, false);
2189	amdgpu_sync_create(&(*mem)->sync);
2190
2191
2192	/* Validate gws bo the first time it is added to process */
2193	mutex_lock(&(*mem)->process_info->lock);
2194	ret = amdgpu_bo_reserve(gws_bo, false);
2195	if (unlikely(ret)) {
2196		pr_err("Reserve gws bo failed %d\n", ret);
2197		goto bo_reservation_failure;
2198	}
2199
2200	ret = amdgpu_amdkfd_bo_validate(gws_bo, AMDGPU_GEM_DOMAIN_GWS, true);
2201	if (ret) {
2202		pr_err("GWS BO validate failed %d\n", ret);
2203		goto bo_validation_failure;
2204	}
2205	/* GWS resource is shared b/t amdgpu and amdkfd
2206	 * Add process eviction fence to bo so they can
2207	 * evict each other.
2208	 */
2209	ret = dma_resv_reserve_shared(gws_bo->tbo.base.resv, 1);
2210	if (ret)
2211		goto reserve_shared_fail;
2212	amdgpu_bo_fence(gws_bo, &process_info->eviction_fence->base, true);
2213	amdgpu_bo_unreserve(gws_bo);
2214	mutex_unlock(&(*mem)->process_info->lock);
2215
2216	return ret;
2217
2218reserve_shared_fail:
2219bo_validation_failure:
2220	amdgpu_bo_unreserve(gws_bo);
2221bo_reservation_failure:
2222	mutex_unlock(&(*mem)->process_info->lock);
2223	amdgpu_sync_free(&(*mem)->sync);
2224	remove_kgd_mem_from_kfd_bo_list(*mem, process_info);
2225	amdgpu_bo_unref(&gws_bo);
2226	mutex_destroy(&(*mem)->lock);
2227	kfree(*mem);
2228	*mem = NULL;
2229	return ret;
2230}
2231
2232int amdgpu_amdkfd_remove_gws_from_process(void *info, void *mem)
2233{
2234	int ret;
2235	struct amdkfd_process_info *process_info = (struct amdkfd_process_info *)info;
2236	struct kgd_mem *kgd_mem = (struct kgd_mem *)mem;
2237	struct amdgpu_bo *gws_bo = kgd_mem->bo;
2238
2239	/* Remove BO from process's validate list so restore worker won't touch
2240	 * it anymore
2241	 */
2242	remove_kgd_mem_from_kfd_bo_list(kgd_mem, process_info);
2243
2244	ret = amdgpu_bo_reserve(gws_bo, false);
2245	if (unlikely(ret)) {
2246		pr_err("Reserve gws bo failed %d\n", ret);
2247		//TODO add BO back to validate_list?
2248		return ret;
2249	}
2250	amdgpu_amdkfd_remove_eviction_fence(gws_bo,
2251			process_info->eviction_fence);
2252	amdgpu_bo_unreserve(gws_bo);
2253	amdgpu_sync_free(&kgd_mem->sync);
2254	amdgpu_bo_unref(&gws_bo);
2255	mutex_destroy(&kgd_mem->lock);
2256	kfree(mem);
2257	return 0;
2258}
2259
2260/* Returns GPU-specific tiling mode information */
2261int amdgpu_amdkfd_get_tile_config(struct kgd_dev *kgd,
2262				struct tile_config *config)
2263{
2264	struct amdgpu_device *adev = (struct amdgpu_device *)kgd;
2265
2266	config->gb_addr_config = adev->gfx.config.gb_addr_config;
2267	config->tile_config_ptr = adev->gfx.config.tile_mode_array;
2268	config->num_tile_configs =
2269			ARRAY_SIZE(adev->gfx.config.tile_mode_array);
2270	config->macro_tile_config_ptr =
2271			adev->gfx.config.macrotile_mode_array;
2272	config->num_macro_tile_configs =
2273			ARRAY_SIZE(adev->gfx.config.macrotile_mode_array);
2274
2275	/* Those values are not set from GFX9 onwards */
2276	config->num_banks = adev->gfx.config.num_banks;
2277	config->num_ranks = adev->gfx.config.num_ranks;
2278
2279	return 0;
2280}