table_freed will be always true when mapping a memory with size
bigger than 2MB. Using a check of turnning valid PDE into PTE
will resolve the issue.
Signed-off-by: Eric Huang <jinhuieric.hu...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 0dee2e8797c7..b1bdc89cb5d1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1553,6 +1553,21 @@ static int amdgpu_vm_update_ptes(struct
amdgpu_vm_update_params *params,
*/
nptes = max(nptes, 1u);
+ /* Fix a page fault in a corner case of
+ * turning valid PDE entry to PTE entry
+ * for huge page mapping
+ */
+ if (cursor.level < AMDGPU_VM_PTB) {
+ int i;
+ for (i = 0; i < nptes; i++) {
+ uint64_t value = 0;
+ vm->update_funcs->get_pt_entry(pt,
+ pe_start + (i * 8),
&value);
+ if (value & AMDGPU_PTE_VALID)
+ params->table_freed = true;
+ }
+ }
+
trace_amdgpu_vm_update_ptes(params, frag_start, upd_end,
nptes, dst, incr, upd_flags,
vm->task_info.pid,
@@ -1584,7 +1599,6 @@ static int amdgpu_vm_update_ptes(struct
amdgpu_vm_update_params *params,
while (cursor.pfn < frag_start) {
amdgpu_vm_free_pts(adev, params->vm, &cursor);
amdgpu_vm_pt_next(adev, &cursor);
- params->table_freed = true;
}
} else if (frag >= shift) {
--
2.25.1
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