[Beignet] [PATCH] Add clGetMemObjectFdIntel() api

[Zhigang Gong]

On Fri, Jan 10, 2014 at 06:18:03PM +0800, Chuanbo Weng wrote:
> Use this api to share buffer between OpenCL and v4l2. After import
> the fd of OpenCL memory object to v4l2, v4l2 can directly read frame
> into this memory object by the way of DMABUF, without memory-copy.
> 
> Signed-off-by: Chuanbo Weng <chuanbo.weng at intel.com>
> ---
>  include/CL/cl_intel.h    |   11 +++++++++++
>  src/cl_api.c             |   15 +++++++++++++++
>  src/cl_driver.h          |    3 +++
>  src/cl_driver_defs.c     |    1 +
>  src/cl_mem.c             |    8 ++++++++
>  src/intel/intel_driver.c |    1 +
>  6 files changed, 39 insertions(+)
> 
> diff --git a/include/CL/cl_intel.h b/include/CL/cl_intel.h
> index 3fd73da..f2fe9d4 100644
> --- a/include/CL/cl_intel.h
> +++ b/include/CL/cl_intel.h
> @@ -122,6 +122,17 @@ typedef CL_API_ENTRY cl_mem (CL_API_CALL *clCreateImageFromLibvaIntel_fn)(
>                               const cl_libva_image * /* info */,
>                               cl_int *               /* errcode_ret */);
>  
> +/* Create buffer from libva's buffer object */
> +extern CL_API_ENTRY cl_int CL_API_CALL
> +clGetMemObjectFdIntel(cl_context   /* context */,
> +                      cl_mem       /* Memory Obejct */,
> +                      int*         /* returned fd */);
> +
> +typedef CL_API_ENTRY cl_int (CL_API_CALL *clGetMemObjectFdIntel_fn)(
> +                             cl_context   /* context */,
> +                             cl_mem       /* Memory Obejct */,
> +                             int*         /* returned fd */);
> +
>  #ifdef __cplusplus
>  }
>  #endif
> diff --git a/src/cl_api.c b/src/cl_api.c
> index 405a41a..d210203 100644
> --- a/src/cl_api.c
> +++ b/src/cl_api.c
> @@ -2668,6 +2668,7 @@ clGetExtensionFunctionAddress(const char *func_name)
>    EXTFUNC(clReportUnfreedIntel)
>    EXTFUNC(clCreateBufferFromLibvaIntel)
>    EXTFUNC(clCreateImageFromLibvaIntel)
> +  EXTFUNC(clGetMemObjectFdIntel)
>    return NULL;
>  }
>  
> @@ -2807,3 +2808,17 @@ error:
>    return mem;
>  }
>  
> +extern CL_API_ENTRY cl_int CL_API_CALL
> +clGetMemObjectFdIntel(cl_context context,
> +                      cl_mem memobj,
> +                      int* fd)
> +{
> +  cl_int err = CL_SUCCESS;
> +  CHECK_CONTEXT (context);
> +  CHECK_MEM (memobj);
> +
> +  err = cl_mem_get_fd(memobj, fd);
> +
> +error:
> +  return err;
> +}
> diff --git a/src/cl_driver.h b/src/cl_driver.h
> index 96fc377..9dc2330 100644
> --- a/src/cl_driver.h
> +++ b/src/cl_driver.h
> @@ -297,6 +297,9 @@ extern cl_buffer_subdata_cb *cl_buffer_subdata;
>  typedef int (cl_buffer_wait_rendering_cb) (cl_buffer);
>  extern cl_buffer_wait_rendering_cb *cl_buffer_wait_rendering;
>  
> +typedef int (cl_buffer_get_fd_cb)(cl_buffer, int *fd);
> +extern cl_buffer_get_fd_cb *cl_buffer_get_fd;
> +
>  /* Get the device id */
>  typedef int (cl_driver_get_device_id_cb)(void);
>  extern cl_driver_get_device_id_cb *cl_driver_get_device_id;
> diff --git a/src/cl_driver_defs.c b/src/cl_driver_defs.c
> index 0a9012c..95a1a03 100644
> --- a/src/cl_driver_defs.c
> +++ b/src/cl_driver_defs.c
> @@ -47,6 +47,7 @@ LOCAL cl_buffer_subdata_cb *cl_buffer_subdata = NULL;
>  LOCAL cl_buffer_wait_rendering_cb *cl_buffer_wait_rendering = NULL;
>  LOCAL cl_buffer_get_buffer_from_libva_cb *cl_buffer_get_buffer_from_libva = NULL;
>  LOCAL cl_buffer_get_image_from_libva_cb *cl_buffer_get_image_from_libva = NULL;
> +LOCAL cl_buffer_get_fd_cb *cl_buffer_get_fd = NULL;
>  
>  /* cl_khr_gl_sharing */
>  LOCAL cl_gl_acquire_texture_cb *cl_gl_acquire_texture = NULL;
> diff --git a/src/cl_mem.c b/src/cl_mem.c
> index 5c4b197..3aaca66 100644
> --- a/src/cl_mem.c
> +++ b/src/cl_mem.c
> @@ -1336,3 +1336,11 @@ error:
>    mem = NULL;
>    goto exit;
>  }
> +
> +LOCAL cl_int
> +cl_mem_get_fd(cl_mem mem,
> +              int* fd)
> +{
> +  cl_buffer_get_fd(mem->bo, fd);
why ignore the return value of drm_intel_bo_wait_rendering()? 

> +  return CL_SUCCESS;
> +}
> diff --git a/src/intel/intel_driver.c b/src/intel/intel_driver.c
> index f88a105..5e474de 100644
> --- a/src/intel/intel_driver.c
> +++ b/src/intel/intel_driver.c
> @@ -682,5 +682,6 @@ intel_setup_callbacks(void)
>    cl_buffer_unpin = (cl_buffer_unpin_cb *) drm_intel_bo_unpin;
>    cl_buffer_subdata = (cl_buffer_subdata_cb *) drm_intel_bo_subdata;
>    cl_buffer_wait_rendering = (cl_buffer_wait_rendering_cb *) drm_intel_bo_wait_rendering;
> +  cl_buffer_get_fd = (cl_buffer_get_fd_cb *) drm_intel_bo_gem_export_to_prime;
>    intel_set_gpgpu_callbacks();
>  }
> -- 
> 1.7.9.5
> 
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