[PATCH 1/2] drm/amdgpu: Enable pinning of a BO and building an sg_table off of it as separate peer services

[Ramesh Errabolu]

[Why]
Enable users to determine the use and sequencing of these services.
Not all uses of pinning need to be followed by building of sg_table

[How]
Rename and refactor the implementaions of gpuvm_pin_get_sgtable() and
gpuvm_unpin_put_sgtable() apis in gpuvm.c

Signed-off-by: Ramesh Errabolu <Ramesh.Errabolu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h    | 12 ++++++----
 .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  | 23 ++++---------------
 2 files changed, 12 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index 8013470d7c8d..92860b16c14b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -249,11 +249,13 @@ int amdgpu_amdkfd_gpuvm_restore_process_bos(void *process_info,
 int amdgpu_amdkfd_gpuvm_get_vm_fault_info(struct kgd_dev *kgd,
 					      struct kfd_vm_fault_info *info);
 
-int amdgpu_amdkfd_gpuvm_pin_get_sg_table(struct kgd_dev *kgd,
-		struct kgd_mem *mem, uint64_t offset,
-		uint64_t size, struct sg_table **ret_sg);
-void amdgpu_amdkfd_gpuvm_unpin_put_sg_table(
-		struct kgd_mem *mem, struct sg_table *sg);
+int amdgpu_amdkfd_gpuvm_pin_bo(struct kgd_mem *mem);
+void amdgpu_amdkfd_gpuvm_unpin_bo(struct kgd_mem *mem);
+
+int amdgpu_amdkfd_gpuvm_get_sg_table(struct kgd_dev *kgd, struct kgd_mem *mem,
+		uint64_t offset, uint64_t size, struct sg_table **ret_sg);
+void amdgpu_amdkfd_gpuvm_put_sg_table(struct sg_table *sg);
+
 int amdgpu_amdkfd_gpuvm_import_dmabuf(struct kgd_dev *kgd,
 				      struct dma_buf *dmabuf,
 				      struct kfd_ipc_obj *ipc_obj,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 702cad576728..0d1984357451 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -1726,7 +1726,7 @@ int amdgpu_amdkfd_gpuvm_get_vm_fault_info(struct kgd_dev *kgd,
 	return 0;
 }
 
-static int pin_bo_wo_map(struct kgd_mem *mem)
+int amdgpu_amdkfd_gpuvm_pin_bo(struct kgd_mem *mem)
 {
 	struct amdgpu_bo *bo = mem->bo;
 	int ret = 0;
@@ -1742,7 +1742,7 @@ static int pin_bo_wo_map(struct kgd_mem *mem)
 	return ret;
 }
 
-static void unpin_bo_wo_map(struct kgd_mem *mem)
+void amdgpu_amdkfd_gpuvm_unpin_bo(struct kgd_mem *mem)
 {
 	struct amdgpu_bo *bo = mem->bo;
 	int ret = 0;
@@ -1852,33 +1852,20 @@ static int get_sg_table(struct amdgpu_device *adev,
 	return ret;
 }
 
-int amdgpu_amdkfd_gpuvm_pin_get_sg_table(struct kgd_dev *kgd,
+int amdgpu_amdkfd_gpuvm_get_sg_table(struct kgd_dev *kgd,
 		struct kgd_mem *mem, uint64_t offset,
 		uint64_t size, struct sg_table **ret_sg)
 {
-	int ret;
 	struct amdgpu_device *adev;
 
-	ret = pin_bo_wo_map(mem);
-	if (unlikely(ret))
-		return ret;
-
 	adev = get_amdgpu_device(kgd);
-
-	ret = get_sg_table(adev, mem, offset, size, ret_sg);
-	if (ret)
-		unpin_bo_wo_map(mem);
-
-	return ret;
+	return get_sg_table(adev, mem, offset, size, ret_sg);
 }
 
-void amdgpu_amdkfd_gpuvm_unpin_put_sg_table(
-		struct kgd_mem *mem, struct sg_table *sg)
+void amdgpu_amdkfd_gpuvm_put_sg_table(struct sg_table *sg)
 {
 	sg_free_table(sg);
 	kfree(sg);
-
-	unpin_bo_wo_map(mem);
 }
 
 int amdgpu_amdkfd_gpuvm_import_dmabuf(struct kgd_dev *kgd,
-- 
2.29.2