1/* SPDX-License-Identifier: GPL-2.0 OR MIT */ 2/* 3 * Copyright 2020-2021 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 */ 24 25#ifndef KFD_SVM_H_ 26#define KFD_SVM_H_ 27 28#if IS_ENABLED(CONFIG_HSA_AMD_SVM) 29 30#include <linux/rwsem.h> 31#include <linux/list.h> 32#include <linux/mutex.h> 33#include <linux/sched/mm.h> 34#include <linux/hmm.h> 35#include "amdgpu.h" 36#include "kfd_priv.h" 37 38#define SVM_RANGE_VRAM_DOMAIN (1UL << 0) 39#define SVM_ADEV_PGMAP_OWNER(adev)\ 40 ((adev)->hive ? (void *)(adev)->hive : (void *)(adev)) 41 42struct svm_range_bo { 43 struct amdgpu_bo *bo; 44 struct kref kref; 45 struct list_head range_list; /* all svm ranges shared this bo */ 46 spinlock_t list_lock; 47 struct amdgpu_amdkfd_fence *eviction_fence; 48 struct work_struct eviction_work; 49 uint32_t evicting; 50 struct work_struct release_work; 51 struct kfd_node *node; 52}; 53 54enum svm_work_list_ops { 55 SVM_OP_NULL, 56 SVM_OP_UNMAP_RANGE, 57 SVM_OP_UPDATE_RANGE_NOTIFIER, 58 SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP, 59 SVM_OP_ADD_RANGE, 60 SVM_OP_ADD_RANGE_AND_MAP 61}; 62 63struct svm_work_list_item { 64 enum svm_work_list_ops op; 65 struct mm_struct *mm; 66}; 67 68/** 69 * struct svm_range - shared virtual memory range 70 * 71 * @svms: list of svm ranges, structure defined in kfd_process 72 * @migrate_mutex: to serialize range migration, validation and mapping update 73 * @start: range start address in pages 74 * @last: range last address in pages 75 * @it_node: node [start, last] stored in interval tree, start, last are page 76 * aligned, page size is (last - start + 1) 77 * @list: link list node, used to scan all ranges of svms 78 * @update_list:link list node used to add to update_list 79 * @mapping: bo_va mapping structure to create and update GPU page table 80 * @npages: number of pages 81 * @vram_pages: vram pages number in this svm_range 82 * @dma_addr: dma mapping address on each GPU for system memory physical page 83 * @ttm_res: vram ttm resource map 84 * @offset: range start offset within mm_nodes 85 * @svm_bo: struct to manage splited amdgpu_bo 86 * @svm_bo_list:link list node, to scan all ranges which share same svm_bo 87 * @lock: protect prange start, last, child_list, svm_bo_list 88 * @saved_flags:save/restore current PF_MEMALLOC flags 89 * @flags: flags defined as KFD_IOCTL_SVM_FLAG_* 90 * @perferred_loc: perferred location, 0 for CPU, or GPU id 91 * @perfetch_loc: last prefetch location, 0 for CPU, or GPU id 92 * @actual_loc: this svm_range location. 0: all pages are from sys ram; 93 * GPU id: this svm_range may include vram pages from GPU with 94 * id actual_loc. 95 * @granularity:migration granularity, log2 num pages 96 * @invalid: not 0 means cpu page table is invalidated 97 * @validate_timestamp: system timestamp when range is validated 98 * @notifier: register mmu interval notifier 99 * @work_item: deferred work item information 100 * @deferred_list: list header used to add range to deferred list 101 * @child_list: list header for split ranges which are not added to svms yet 102 * @bitmap_access: index bitmap of GPUs which can access the range 103 * @bitmap_aip: index bitmap of GPUs which can access the range in place 104 * 105 * Data structure for virtual memory range shared by CPU and GPUs, it can be 106 * allocated from system memory ram or device vram, and migrate from ram to vram 107 * or from vram to ram. 108 */ 109struct svm_range { 110 struct svm_range_list *svms; 111 struct mutex migrate_mutex; 112 unsigned long start; 113 unsigned long last; 114 struct interval_tree_node it_node; 115 struct list_head list; 116 struct list_head update_list; 117 uint64_t npages; 118 uint64_t vram_pages; 119 dma_addr_t *dma_addr[MAX_GPU_INSTANCE]; 120 struct ttm_resource *ttm_res; 121 uint64_t offset; 122 struct svm_range_bo *svm_bo; 123 struct list_head svm_bo_list; 124 struct mutex lock; 125 unsigned int saved_flags; 126 uint32_t flags; 127 uint32_t preferred_loc; 128 uint32_t prefetch_loc; 129 uint32_t actual_loc; 130 uint8_t granularity; 131 atomic_t invalid; 132 ktime_t validate_timestamp; 133 struct mmu_interval_notifier notifier; 134 struct svm_work_list_item work_item; 135 struct list_head deferred_list; 136 struct list_head child_list; 137 DECLARE_BITMAP(bitmap_access, MAX_GPU_INSTANCE); 138 DECLARE_BITMAP(bitmap_aip, MAX_GPU_INSTANCE); 139 bool mapped_to_gpu; 140}; 141 142static inline void svm_range_lock(struct svm_range *prange) 143{ 144 mutex_lock(&prange->lock); 145 prange->saved_flags = memalloc_noreclaim_save(); 146 147} 148static inline void svm_range_unlock(struct svm_range *prange) 149{ 150 memalloc_noreclaim_restore(prange->saved_flags); 151 mutex_unlock(&prange->lock); 152} 153 154static inline struct svm_range_bo *svm_range_bo_ref(struct svm_range_bo *svm_bo) 155{ 156 if (svm_bo) 157 kref_get(&svm_bo->kref); 158 159 return svm_bo; 160} 161 162int svm_range_list_init(struct kfd_process *p); 163void svm_range_list_fini(struct kfd_process *p); 164int svm_ioctl(struct kfd_process *p, enum kfd_ioctl_svm_op op, uint64_t start, 165 uint64_t size, uint32_t nattrs, 166 struct kfd_ioctl_svm_attribute *attrs); 167struct svm_range *svm_range_from_addr(struct svm_range_list *svms, 168 unsigned long addr, 169 struct svm_range **parent); 170struct kfd_node *svm_range_get_node_by_id(struct svm_range *prange, 171 uint32_t gpu_id); 172int svm_range_vram_node_new(struct kfd_node *node, struct svm_range *prange, 173 bool clear); 174void svm_range_vram_node_free(struct svm_range *prange); 175int svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid, 176 uint32_t vmid, uint32_t node_id, uint64_t addr, 177 bool write_fault); 178int svm_range_schedule_evict_svm_bo(struct amdgpu_amdkfd_fence *fence); 179void svm_range_add_list_work(struct svm_range_list *svms, 180 struct svm_range *prange, struct mm_struct *mm, 181 enum svm_work_list_ops op); 182void schedule_deferred_list_work(struct svm_range_list *svms); 183void svm_range_dma_unmap_dev(struct device *dev, dma_addr_t *dma_addr, 184 unsigned long offset, unsigned long npages); 185void svm_range_dma_unmap(struct svm_range *prange); 186int svm_range_get_info(struct kfd_process *p, uint32_t *num_svm_ranges, 187 uint64_t *svm_priv_data_size); 188int kfd_criu_checkpoint_svm(struct kfd_process *p, 189 uint8_t __user *user_priv_data, 190 uint64_t *priv_offset); 191int kfd_criu_restore_svm(struct kfd_process *p, 192 uint8_t __user *user_priv_ptr, 193 uint64_t *priv_data_offset, 194 uint64_t max_priv_data_size); 195int kfd_criu_resume_svm(struct kfd_process *p); 196struct kfd_process_device * 197svm_range_get_pdd_by_node(struct svm_range *prange, struct kfd_node *node); 198void svm_range_list_lock_and_flush_work(struct svm_range_list *svms, struct mm_struct *mm); 199 200/* SVM API and HMM page migration work together, device memory type 201 * is initialized to not 0 when page migration register device memory. 202 */ 203#define KFD_IS_SVM_API_SUPPORTED(adev) ((adev)->kfd.pgmap.type != 0 ||\ 204 (adev)->gmc.is_app_apu) 205 206void svm_range_bo_unref_async(struct svm_range_bo *svm_bo); 207 208void svm_range_set_max_pages(struct amdgpu_device *adev); 209int svm_range_switch_xnack_reserve_mem(struct kfd_process *p, bool xnack_enabled); 210 211#else 212 213struct kfd_process; 214 215static inline int svm_range_list_init(struct kfd_process *p) 216{ 217 return 0; 218} 219static inline void svm_range_list_fini(struct kfd_process *p) 220{ 221 /* empty */ 222} 223 224static inline int svm_range_restore_pages(struct amdgpu_device *adev, 225 unsigned int pasid, 226 uint32_t client_id, uint32_t node_id, 227 uint64_t addr, bool write_fault) 228{ 229 return -EFAULT; 230} 231 232static inline int svm_range_schedule_evict_svm_bo( 233 struct amdgpu_amdkfd_fence *fence) 234{ 235 WARN_ONCE(1, "SVM eviction fence triggered, but SVM is disabled"); 236 return -EINVAL; 237} 238 239static inline int svm_range_get_info(struct kfd_process *p, 240 uint32_t *num_svm_ranges, 241 uint64_t *svm_priv_data_size) 242{ 243 *num_svm_ranges = 0; 244 *svm_priv_data_size = 0; 245 return 0; 246} 247 248static inline int kfd_criu_checkpoint_svm(struct kfd_process *p, 249 uint8_t __user *user_priv_data, 250 uint64_t *priv_offset) 251{ 252 return 0; 253} 254 255static inline int kfd_criu_restore_svm(struct kfd_process *p, 256 uint8_t __user *user_priv_ptr, 257 uint64_t *priv_data_offset, 258 uint64_t max_priv_data_size) 259{ 260 return -EINVAL; 261} 262 263static inline int kfd_criu_resume_svm(struct kfd_process *p) 264{ 265 return 0; 266} 267 268static inline void svm_range_set_max_pages(struct amdgpu_device *adev) 269{ 270} 271 272#define KFD_IS_SVM_API_SUPPORTED(dev) false 273 274#endif /* IS_ENABLED(CONFIG_HSA_AMD_SVM) */ 275 276#endif /* KFD_SVM_H_ */ 277