amdgpu: add a function to find bo by cpu mapping (v2)

Userspace needs to know if the user memory is from BO or malloc.

v2: update mutex range and rebase

Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/amdgpu/amdgpu.h b/amdgpu/amdgpu.h
index be83b457..a8c353c6 100644
--- a/amdgpu/amdgpu.h
+++ b/amdgpu/amdgpu.h
@@ -678,6 +678,29 @@ int amdgpu_create_bo_from_user_mem(amdgpu_device_handle dev,
 				    amdgpu_bo_handle *buf_handle);
 
 /**
+ * Validate if the user memory comes from BO
+ *
+ * \param dev - [in] Device handle. See #amdgpu_device_initialize()
+ * \param cpu - [in] CPU address of user allocated memory which we
+ * want to map to GPU address space (make GPU accessible)
+ * (This address must be correctly aligned).
+ * \param size - [in] Size of allocation (must be correctly aligned)
+ * \param buf_handle - [out] Buffer handle for the userptr memory
+ * if the user memory is not from BO, the buf_handle will be NULL.
+ * \param offset_in_bo - [out] offset in this BO for this user memory
+ *
+ *
+ * \return   0 on success\n
+ *          <0 - Negative POSIX Error code
+ *
+*/
+int amdgpu_find_bo_by_cpu_mapping(amdgpu_device_handle dev,
+				  void *cpu,
+				  uint64_t size,
+				  amdgpu_bo_handle *buf_handle,
+				  uint64_t *offset_in_bo);
+
+/**
  * Free previosuly allocated memory
  *
  * \param   dev	       - \c [in] Device handle. See #amdgpu_device_initialize()