drm/amdgpu: add some extra VM error handling

If updating the PDs fails we now invalidate all entries to try again later.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 33 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index c11903257b94..6af2d3c56f38 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1104,6 +1104,32 @@ error_free:
 }
 
 /*
+ * amdgpu_vm_invalidate_level - mark all PD levels as invalid
+ *
+ * @parent: parent PD
+ *
+ * Mark all PD level as invalid after an error.
+ */
+static void amdgpu_vm_invalidate_level(struct amdgpu_vm_pt *parent)
+{
+        unsigned pt_idx;
+
+        /*
+         * Recurse into the subdirectories. This recursion is harmless because
+         * we only have a maximum of 5 layers.
+         */
+        for (pt_idx = 0; pt_idx <= parent->last_entry_used; ++pt_idx) {
+                struct amdgpu_vm_pt *entry = &parent->entries[pt_idx];
+
+                if (!entry->bo)
+                        continue;
+
+                entry->addr = ~0ULL;
+                amdgpu_vm_invalidate_level(entry);
+        }
+}
+
+/*
  * amdgpu_vm_update_directories - make sure that all directories are valid
  *
  * @adev: amdgpu_device pointer
@@ -1115,7 +1141,13 @@ error_free:
 int amdgpu_vm_update_directories(struct amdgpu_device *adev,
                                  struct amdgpu_vm *vm)
 {
-        return amdgpu_vm_update_level(adev, vm, &vm->root, 0);
+        int r;
+
+        r = amdgpu_vm_update_level(adev, vm, &vm->root, 0);
+        if (r)
+                amdgpu_vm_invalidate_level(&vm->root);
+
+        return r;
 }
 
 /**