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/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/*
* Copyright 2020-2021 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef KFD_SVM_H_
#define KFD_SVM_H_
#if IS_ENABLED(CONFIG_HSA_AMD_SVM)
#include <linux/rwsem.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/sched/mm.h>
#include <linux/hmm.h>
#include "amdgpu.h"
#include "kfd_priv.h"
#define SVM_RANGE_VRAM_DOMAIN (1UL << 0)
#define SVM_ADEV_PGMAP_OWNER(adev)\
((adev)->hive ? (void *)(adev)->hive : (void *)(adev))
struct svm_range_bo {
struct amdgpu_bo *bo;
struct kref kref;
struct list_head range_list; /* all svm ranges shared this bo */
spinlock_t list_lock;
struct amdgpu_amdkfd_fence *eviction_fence;
struct work_struct eviction_work;
struct svm_range_list *svms;
uint32_t evicting;
struct work_struct release_work;
};
enum svm_work_list_ops {
SVM_OP_NULL,
SVM_OP_UNMAP_RANGE,
SVM_OP_UPDATE_RANGE_NOTIFIER,
SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP,
SVM_OP_ADD_RANGE,
SVM_OP_ADD_RANGE_AND_MAP
};
struct svm_work_list_item {
enum svm_work_list_ops op;
struct mm_struct *mm;
};
/**
* struct svm_range - shared virtual memory range
*
* @svms: list of svm ranges, structure defined in kfd_process
* @migrate_mutex: to serialize range migration, validation and mapping update
* @start: range start address in pages
* @last: range last address in pages
* @it_node: node [start, last] stored in interval tree, start, last are page
* aligned, page size is (last - start + 1)
* @list: link list node, used to scan all ranges of svms
* @update_list:link list node used to add to update_list
* @remove_list:link list node used to add to remove list
* @insert_list:link list node used to add to insert list
* @mapping: bo_va mapping structure to create and update GPU page table
* @npages: number of pages
* @dma_addr: dma mapping address on each GPU for system memory physical page
* @ttm_res: vram ttm resource map
* @offset: range start offset within mm_nodes
* @svm_bo: struct to manage splited amdgpu_bo
* @svm_bo_list:link list node, to scan all ranges which share same svm_bo
* @lock: protect prange start, last, child_list, svm_bo_list
* @saved_flags:save/restore current PF_MEMALLOC flags
* @flags: flags defined as KFD_IOCTL_SVM_FLAG_*
* @perferred_loc: perferred location, 0 for CPU, or GPU id
* @perfetch_loc: last prefetch location, 0 for CPU, or GPU id
* @actual_loc: the actual location, 0 for CPU, or GPU id
* @granularity:migration granularity, log2 num pages
* @invalid: not 0 means cpu page table is invalidated
* @validate_timestamp: system timestamp when range is validated
* @notifier: register mmu interval notifier
* @work_item: deferred work item information
* @deferred_list: list header used to add range to deferred list
* @child_list: list header for split ranges which are not added to svms yet
* @bitmap_access: index bitmap of GPUs which can access the range
* @bitmap_aip: index bitmap of GPUs which can access the range in place
*
* Data structure for virtual memory range shared by CPU and GPUs, it can be
* allocated from system memory ram or device vram, and migrate from ram to vram
* or from vram to ram.
*/
struct svm_range {
struct svm_range_list *svms;
struct mutex migrate_mutex;
unsigned long start;
unsigned long last;
struct interval_tree_node it_node;
struct list_head list;
struct list_head update_list;
struct list_head remove_list;
struct list_head insert_list;
uint64_t npages;
dma_addr_t *dma_addr[MAX_GPU_INSTANCE];
struct ttm_resource *ttm_res;
uint64_t offset;
struct svm_range_bo *svm_bo;
struct list_head svm_bo_list;
struct mutex lock;
unsigned int saved_flags;
uint32_t flags;
uint32_t preferred_loc;
uint32_t prefetch_loc;
uint32_t actual_loc;
uint8_t granularity;
atomic_t invalid;
uint64_t validate_timestamp;
struct mmu_interval_notifier notifier;
struct svm_work_list_item work_item;
struct list_head deferred_list;
struct list_head child_list;
DECLARE_BITMAP(bitmap_access, MAX_GPU_INSTANCE);
DECLARE_BITMAP(bitmap_aip, MAX_GPU_INSTANCE);
bool validated_once;
};
static inline void svm_range_lock(struct svm_range *prange)
{
mutex_lock(&prange->lock);
prange->saved_flags = memalloc_noreclaim_save();
}
static inline void svm_range_unlock(struct svm_range *prange)
{
memalloc_noreclaim_restore(prange->saved_flags);
mutex_unlock(&prange->lock);
}
static inline struct svm_range_bo *svm_range_bo_ref(struct svm_range_bo *svm_bo)
{
if (svm_bo)
kref_get(&svm_bo->kref);
return svm_bo;
}
int svm_range_list_init(struct kfd_process *p);
void svm_range_list_fini(struct kfd_process *p);
int svm_ioctl(struct kfd_process *p, enum kfd_ioctl_svm_op op, uint64_t start,
uint64_t size, uint32_t nattrs,
struct kfd_ioctl_svm_attribute *attrs);
struct svm_range *svm_range_from_addr(struct svm_range_list *svms,
unsigned long addr,
struct svm_range **parent);
struct amdgpu_device *svm_range_get_adev_by_id(struct svm_range *prange,
uint32_t id);
int svm_range_vram_node_new(struct amdgpu_device *adev,
struct svm_range *prange, bool clear);
void svm_range_vram_node_free(struct svm_range *prange);
int svm_range_split_by_granularity(struct kfd_process *p, struct mm_struct *mm,
unsigned long addr, struct svm_range *parent,
struct svm_range *prange);
int svm_range_restore_pages(struct amdgpu_device *adev,
unsigned int pasid, uint64_t addr, bool write_fault);
int svm_range_schedule_evict_svm_bo(struct amdgpu_amdkfd_fence *fence);
void svm_range_add_list_work(struct svm_range_list *svms,
struct svm_range *prange, struct mm_struct *mm,
enum svm_work_list_ops op);
void schedule_deferred_list_work(struct svm_range_list *svms);
void svm_range_dma_unmap(struct device *dev, dma_addr_t *dma_addr,
unsigned long offset, unsigned long npages);
void svm_range_free_dma_mappings(struct svm_range *prange);
void svm_range_prefault(struct svm_range *prange, struct mm_struct *mm,
void *owner);
struct kfd_process_device *
svm_range_get_pdd_by_adev(struct svm_range *prange, struct amdgpu_device *adev);
void svm_range_list_lock_and_flush_work(struct svm_range_list *svms, struct mm_struct *mm);
/* SVM API and HMM page migration work together, device memory type
* is initialized to not 0 when page migration register device memory.
*/
#define KFD_IS_SVM_API_SUPPORTED(dev) ((dev)->pgmap.type != 0)
void svm_range_bo_unref_async(struct svm_range_bo *svm_bo);
#else
struct kfd_process;
static inline int svm_range_list_init(struct kfd_process *p)
{
return 0;
}
static inline void svm_range_list_fini(struct kfd_process *p)
{
/* empty */
}
static inline int svm_range_restore_pages(struct amdgpu_device *adev,
unsigned int pasid, uint64_t addr,
bool write_fault)
{
return -EFAULT;
}
static inline int svm_range_schedule_evict_svm_bo(
struct amdgpu_amdkfd_fence *fence)
{
WARN_ONCE(1, "SVM eviction fence triggered, but SVM is disabled");
return -EINVAL;
}
#define KFD_IS_SVM_API_SUPPORTED(dev) false
#endif /* IS_ENABLED(CONFIG_HSA_AMD_SVM) */
#endif /* KFD_SVM_H_ */
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