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drm/amdkfd: page table restore through svm API

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Page table restore implementation in SVM API. This is called from
the fault handler at amdgpu_vm. To update page tables through
the page fault retry IH.

Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling 2021-02-24 23:02:21 -05:00 committed by Alex Deucher
parent 9dd9cc2f74
commit 2383f56bbe
2 changed files with 61 additions and 0 deletions
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59
drivers/gpu/drm/amd/amdkfd/kfd_svm.c
View File

@ -1997,6 +1997,65 @@ svm_range_from_addr(struct svm_range_list *svms, unsigned long addr,
return NULL;
}
int
svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid,
uint64_t addr)
{
int r = 0;
struct mm_struct *mm = NULL;
struct svm_range *prange;
struct svm_range_list *svms;
struct kfd_process *p;
p = kfd_lookup_process_by_pasid(pasid);
if (!p) {
pr_debug("kfd process not founded pasid 0x%x\n", pasid);
return -ESRCH;
}
if (!p->xnack_enabled) {
pr_debug("XNACK not enabled for pasid 0x%x\n", pasid);
return -EFAULT;
}
svms = &p->svms;
pr_debug("restoring svms 0x%p fault address 0x%llx\n", svms, addr);
mm = get_task_mm(p->lead_thread);
if (!mm) {
pr_debug("svms 0x%p failed to get mm\n", svms);
r = -ESRCH;
goto out;
}
mmap_read_lock(mm);
mutex_lock(&svms->lock);
prange = svm_range_from_addr(svms, addr, NULL);
if (!prange) {
pr_debug("failed to find prange svms 0x%p address [0x%llx]\n",
svms, addr);
r = -EFAULT;
goto out_unlock_svms;
}
mutex_lock(&prange->migrate_mutex);
r = svm_range_validate_and_map(mm, prange, MAX_GPU_INSTANCE, false, false);
if (r)
pr_debug("failed %d to map svms 0x%p [0x%lx 0x%lx] to gpu\n", r,
svms, prange->start, prange->last);
mutex_unlock(&prange->migrate_mutex);
out_unlock_svms:
mutex_unlock(&svms->lock);
mmap_read_unlock(mm);
mmput(mm);
out:
kfd_unref_process(p);
return r;
}
void svm_range_list_fini(struct kfd_process *p)
{
struct svm_range *prange;

2
drivers/gpu/drm/amd/amdkfd/kfd_svm.h
View File

@ -155,6 +155,8 @@ 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);
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);