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@xxxxxxx>
Signed-off-by: Philip Yang <Philip.Yang@xxxxxxx>
Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
---
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 59 ++++++++++++++++++++++++++++
drivers/gpu/drm/amd/amdkfd/kfd_svm.h | 2 +
2 files changed, 61 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 7da58a4214c0..7b2c97b7f48c 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1964,6 +1964,65 @@ 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;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
index 6cc12de8d76a..168c623f4477 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
@@ -154,6 +154,8 @@ 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);
--
2.31.1
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