drivers/gpu/drm/amd/amdkfd/kfd_svm.h

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