[PATCH 02/11] drm/amdgpu: add amdgpu_vm_pt_parent helper

[Christian König]

Add a function to get the parent of a PD/PT.

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 36 ++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 1f79a0ddc78a..5eae2bb5f368 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -337,6 +337,24 @@ static void amdgpu_vm_bo_base_init(struct 
amdgpu_vm_bo_base *base,
        amdgpu_vm_bo_evicted(base);
 }
 
+/**
+ * amdgpu_vm_pt_parent - get the parent page directory
+ *
+ * @pt: child page table
+ *
+ * Helper to get the parent entry for the child page table. NULL if we are at
+ * the root page directory.
+ */
+static struct amdgpu_vm_pt *amdgpu_vm_pt_parent(struct amdgpu_vm_pt *pt)
+{
+       struct amdgpu_bo *parent = pt->base.bo->parent;
+
+       if (!parent)
+               return NULL;
+
+       return list_first_entry(&parent->va, struct amdgpu_vm_pt, base.bo_list);
+}
+
 /**
  * amdgpu_vm_get_pd_bo - add the VM PD to a validation list
  *
@@ -1202,24 +1220,16 @@ int amdgpu_vm_update_directories(struct amdgpu_device 
*adev,
        }
 
        while (!list_empty(&vm->relocated)) {
-               struct amdgpu_vm_bo_base *bo_base, *parent;
                struct amdgpu_vm_pt *pt, *entry;
-               struct amdgpu_bo *bo;
 
-               bo_base = list_first_entry(&vm->relocated,
-                                          struct amdgpu_vm_bo_base,
-                                          vm_status);
-               amdgpu_vm_bo_idle(bo_base);
+               entry = list_first_entry(&vm->relocated, struct amdgpu_vm_pt,
+                                        base.vm_status);
+               amdgpu_vm_bo_idle(&entry->base);
 
-               bo = bo_base->bo->parent;
-               if (!bo)
+               pt = amdgpu_vm_pt_parent(entry);
+               if (!pt)
                        continue;
 
-               parent = list_first_entry(&bo->va, struct amdgpu_vm_bo_base,
-                                         bo_list);
-               pt = container_of(parent, struct amdgpu_vm_pt, base);
-               entry = container_of(bo_base, struct amdgpu_vm_pt, base);
-
                amdgpu_vm_update_pde(&params, vm, pt, entry);
 
                if (!vm->use_cpu_for_update &&
-- 
2.14.1

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