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 42 struct 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 struct svm_range_list *svms; 50 uint32_t evicting; 51 struct work_struct release_work; 52 }; 53 54 enum 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 63 struct 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 * @dma_addr: dma mapping address on each GPU for system memory physical page 82 * @ttm_res: vram ttm resource map 83 * @offset: range start offset within mm_nodes 84 * @svm_bo: struct to manage splited amdgpu_bo 85 * @svm_bo_list:link list node, to scan all ranges which share same svm_bo 86 * @lock: protect prange start, last, child_list, svm_bo_list 87 * @saved_flags:save/restore current PF_MEMALLOC flags 88 * @flags: flags defined as KFD_IOCTL_SVM_FLAG_* 89 * @perferred_loc: perferred location, 0 for CPU, or GPU id 90 * @perfetch_loc: last prefetch location, 0 for CPU, or GPU id 91 * @actual_loc: the actual location, 0 for CPU, or GPU id 92 * @granularity:migration granularity, log2 num pages 93 * @invalid: not 0 means cpu page table is invalidated 94 * @validate_timestamp: system timestamp when range is validated 95 * @notifier: register mmu interval notifier 96 * @work_item: deferred work item information 97 * @deferred_list: list header used to add range to deferred list 98 * @child_list: list header for split ranges which are not added to svms yet 99 * @bitmap_access: index bitmap of GPUs which can access the range 100 * @bitmap_aip: index bitmap of GPUs which can access the range in place 101 * 102 * Data structure for virtual memory range shared by CPU and GPUs, it can be 103 * allocated from system memory ram or device vram, and migrate from ram to vram 104 * or from vram to ram. 105 */ 106 struct svm_range { 107 struct svm_range_list *svms; 108 struct mutex migrate_mutex; 109 unsigned long start; 110 unsigned long last; 111 struct interval_tree_node it_node; 112 struct list_head list; 113 struct list_head update_list; 114 uint64_t npages; 115 dma_addr_t *dma_addr[MAX_GPU_INSTANCE]; 116 struct ttm_resource *ttm_res; 117 uint64_t offset; 118 struct svm_range_bo *svm_bo; 119 struct list_head svm_bo_list; 120 struct mutex lock; 121 unsigned int saved_flags; 122 uint32_t flags; 123 uint32_t preferred_loc; 124 uint32_t prefetch_loc; 125 uint32_t actual_loc; 126 uint8_t granularity; 127 atomic_t invalid; 128 ktime_t validate_timestamp; 129 struct mmu_interval_notifier notifier; 130 struct svm_work_list_item work_item; 131 struct list_head deferred_list; 132 struct list_head child_list; 133 DECLARE_BITMAP(bitmap_access, MAX_GPU_INSTANCE); 134 DECLARE_BITMAP(bitmap_aip, MAX_GPU_INSTANCE); 135 bool validated_once; 136 bool mapped_to_gpu; 137 }; 138 139 static inline void svm_range_lock(struct svm_range *prange) 140 { 141 mutex_lock(&prange->lock); 142 prange->saved_flags = memalloc_noreclaim_save(); 143 144 } 145 static inline void svm_range_unlock(struct svm_range *prange) 146 { 147 memalloc_noreclaim_restore(prange->saved_flags); 148 mutex_unlock(&prange->lock); 149 } 150 151 static inline struct svm_range_bo *svm_range_bo_ref(struct svm_range_bo *svm_bo) 152 { 153 if (svm_bo) 154 kref_get(&svm_bo->kref); 155 156 return svm_bo; 157 } 158 159 int svm_range_list_init(struct kfd_process *p); 160 void svm_range_list_fini(struct kfd_process *p); 161 int svm_ioctl(struct kfd_process *p, enum kfd_ioctl_svm_op op, uint64_t start, 162 uint64_t size, uint32_t nattrs, 163 struct kfd_ioctl_svm_attribute *attrs); 164 struct svm_range *svm_range_from_addr(struct svm_range_list *svms, 165 unsigned long addr, 166 struct svm_range **parent); 167 struct amdgpu_device *svm_range_get_adev_by_id(struct svm_range *prange, 168 uint32_t id); 169 int svm_range_vram_node_new(struct amdgpu_device *adev, 170 struct svm_range *prange, bool clear); 171 void svm_range_vram_node_free(struct svm_range *prange); 172 int svm_range_split_by_granularity(struct kfd_process *p, struct mm_struct *mm, 173 unsigned long addr, struct svm_range *parent, 174 struct svm_range *prange); 175 int svm_range_restore_pages(struct amdgpu_device *adev, 176 unsigned int pasid, uint64_t addr, bool write_fault); 177 int svm_range_schedule_evict_svm_bo(struct amdgpu_amdkfd_fence *fence); 178 void svm_range_add_list_work(struct svm_range_list *svms, 179 struct svm_range *prange, struct mm_struct *mm, 180 enum svm_work_list_ops op); 181 void schedule_deferred_list_work(struct svm_range_list *svms); 182 void svm_range_dma_unmap(struct device *dev, dma_addr_t *dma_addr, 183 unsigned long offset, unsigned long npages); 184 void svm_range_free_dma_mappings(struct svm_range *prange); 185 void svm_range_prefault(struct svm_range *prange, struct mm_struct *mm, 186 void *owner); 187 int svm_range_get_info(struct kfd_process *p, uint32_t *num_svm_ranges, 188 uint64_t *svm_priv_data_size); 189 int kfd_criu_checkpoint_svm(struct kfd_process *p, 190 uint8_t __user *user_priv_data, 191 uint64_t *priv_offset); 192 int kfd_criu_restore_svm(struct kfd_process *p, 193 uint8_t __user *user_priv_ptr, 194 uint64_t *priv_data_offset, 195 uint64_t max_priv_data_size); 196 int kfd_criu_resume_svm(struct kfd_process *p); 197 struct kfd_process_device * 198 svm_range_get_pdd_by_adev(struct svm_range *prange, struct amdgpu_device *adev); 199 void svm_range_list_lock_and_flush_work(struct svm_range_list *svms, struct mm_struct *mm); 200 201 /* SVM API and HMM page migration work together, device memory type 202 * is initialized to not 0 when page migration register device memory. 203 */ 204 #define KFD_IS_SVM_API_SUPPORTED(dev) ((dev)->pgmap.type != 0) 205 206 void svm_range_bo_unref_async(struct svm_range_bo *svm_bo); 207 208 void svm_range_set_max_pages(struct amdgpu_device *adev); 209 210 #else 211 212 struct kfd_process; 213 214 static inline int svm_range_list_init(struct kfd_process *p) 215 { 216 return 0; 217 } 218 static inline void svm_range_list_fini(struct kfd_process *p) 219 { 220 /* empty */ 221 } 222 223 static inline int svm_range_restore_pages(struct amdgpu_device *adev, 224 unsigned int pasid, uint64_t addr, 225 bool write_fault) 226 { 227 return -EFAULT; 228 } 229 230 static inline int svm_range_schedule_evict_svm_bo( 231 struct amdgpu_amdkfd_fence *fence) 232 { 233 WARN_ONCE(1, "SVM eviction fence triggered, but SVM is disabled"); 234 return -EINVAL; 235 } 236 237 static inline int svm_range_get_info(struct kfd_process *p, 238 uint32_t *num_svm_ranges, 239 uint64_t *svm_priv_data_size) 240 { 241 *num_svm_ranges = 0; 242 *svm_priv_data_size = 0; 243 return 0; 244 } 245 246 static inline int kfd_criu_checkpoint_svm(struct kfd_process *p, 247 uint8_t __user *user_priv_data, 248 uint64_t *priv_offset) 249 { 250 return 0; 251 } 252 253 static inline int kfd_criu_restore_svm(struct kfd_process *p, 254 uint8_t __user *user_priv_ptr, 255 uint64_t *priv_data_offset, 256 uint64_t max_priv_data_size) 257 { 258 return -EINVAL; 259 } 260 261 static inline int kfd_criu_resume_svm(struct kfd_process *p) 262 { 263 return 0; 264 } 265 266 #define KFD_IS_SVM_API_SUPPORTED(dev) false 267 268 #endif /* IS_ENABLED(CONFIG_HSA_AMD_SVM) */ 269 270 #endif /* KFD_SVM_H_ */ 271