[PATCH 1/3] drm/amdpgu: add a function to get vm page talbe entry

[Eric Huang]

it is for large bar/xgmi which has cpu update function,
for small bar that has sdma update function it will be done
later.

Signed-off-by: Eric Huang <jinhuieric.huang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c  | 21 ++++++++++++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 10 +++++++++-
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 67bba8462e7d..8a23de0e0abc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -247,6 +247,7 @@ struct amdgpu_vm_update_funcs {
 		      unsigned count, uint32_t incr, uint64_t flags);
 	int (*commit)(struct amdgpu_vm_update_params *p,
 		      struct dma_fence **fence);
+	int (*get_pt_entry)(struct amdgpu_bo *bo, uint64_t pe, uint64_t *value);
 };
 
 struct amdgpu_vm {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c
index aefb3d2927d5..8a68a5c6326c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c
@@ -116,9 +116,28 @@ static int amdgpu_vm_cpu_commit(struct amdgpu_vm_update_params *p,
 	return 0;
 }
 
+static int amdgpu_vm_get_pt_entry(struct amdgpu_bo *bo,
+		uint64_t pe, uint64_t *value)
+{
+	int r;
+
+	if (bo->tbo.moving) {
+		r = dma_fence_wait(bo->tbo.moving, true);
+		if (r)
+			return r;
+	}
+
+	pe += (unsigned long)amdgpu_bo_kptr(bo);
+
+	*value = *((uint64_t *)pe);
+
+	return 0;
+}
+
 const struct amdgpu_vm_update_funcs amdgpu_vm_cpu_funcs = {
 	.map_table = amdgpu_vm_cpu_map_table,
 	.prepare = amdgpu_vm_cpu_prepare,
 	.update = amdgpu_vm_cpu_update,
-	.commit = amdgpu_vm_cpu_commit
+	.commit = amdgpu_vm_cpu_commit,
+	.get_pt_entry = amdgpu_vm_get_pt_entry
 };
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
index a83a646759c5..d8871fbddc76 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
@@ -274,9 +274,17 @@ static int amdgpu_vm_sdma_update(struct amdgpu_vm_update_params *p,
 	return 0;
 }
 
+static int amdgpu_vm_sdma_get_pt_entry(struct amdgpu_bo *bo,
+		uint64_t pe, uint64_t *value)
+{
+	/* TODO */
+	return 0;
+}
+
 const struct amdgpu_vm_update_funcs amdgpu_vm_sdma_funcs = {
 	.map_table = amdgpu_vm_sdma_map_table,
 	.prepare = amdgpu_vm_sdma_prepare,
 	.update = amdgpu_vm_sdma_update,
-	.commit = amdgpu_vm_sdma_commit
+	.commit = amdgpu_vm_sdma_commit,
+	.get_pt_entry = amdgpu_vm_sdma_get_pt_entry
 };
-- 
2.25.1