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Commit b733bc2e authored by Thomas Hellstrom's avatar Thomas Hellstrom
Browse files

drm/vmwgfx: Look up user buffer objects without taking a reference 



Identically to how we look up ttm base objects witout reference, provide
the same functionality to vmw user buffer objects which derive from them.

Signed-off-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: default avatarSinclair Yeh <syeh@vmware.com>
parent 64ad2abf

drivers/gpu/drm/vmwgfx/vmwgfx_bo.c

+41 −0
Original line number Original line Diff line number Diff line
@@ -921,6 +921,47 @@ int vmw_user_bo_lookup(struct ttm_object_file *tfile, 
	return 0;

	return 0;

}

}





/**

 * vmw_user_bo_noref_lookup - Look up a vmw user buffer object without reference

 * @tfile: The TTM object file the handle is registered with.

 * @handle: The user buffer object handle.

 *

 * This function looks up a struct vmw_user_bo and returns a pointer to the

 * struct vmw_buffer_object it derives from without refcounting the pointer.

 * The returned pointer is only valid until vmw_user_bo_noref_release() is

 * called, and the object pointed to by the returned pointer may be doomed.

 * Any persistent usage of the object requires a refcount to be taken using

 * ttm_bo_reference_unless_doomed(). Iff this function returns successfully it

 * needs to be paired with vmw_user_bo_noref_release() and no sleeping-

 * or scheduling functions may be called inbetween these function calls.

 *

 * Return: A struct vmw_buffer_object pointer if successful or negative

 * error pointer on failure.

 */

struct vmw_buffer_object *

vmw_user_bo_noref_lookup(struct ttm_object_file *tfile, u32 handle)

{

	struct vmw_user_buffer_object *vmw_user_bo;

	struct ttm_base_object *base;



	base = ttm_base_object_noref_lookup(tfile, handle);

	if (!base) {

		DRM_ERROR("Invalid buffer object handle 0x%08lx.\n",

			  (unsigned long)handle);

		return ERR_PTR(-ESRCH);

	}



	if (unlikely(ttm_base_object_type(base) != ttm_buffer_type)) {

		ttm_base_object_noref_release();

		DRM_ERROR("Invalid buffer object handle 0x%08lx.\n",

			  (unsigned long)handle);

		return ERR_PTR(-EINVAL);

	}



	vmw_user_bo = container_of(base, struct vmw_user_buffer_object,

				   prime.base);

	return &vmw_user_bo->vbo;

}





/**

/**

 * vmw_user_bo_reference - Open a handle to a vmw user buffer object.

 * vmw_user_bo_reference - Open a handle to a vmw user buffer object.

drivers/gpu/drm/vmwgfx/vmwgfx_drv.h

+12 −0
Original line number Original line Diff line number Diff line
@@ -772,6 +772,18 @@ extern void vmw_bo_unmap(struct vmw_buffer_object *vbo); 
extern void vmw_bo_move_notify(struct ttm_buffer_object *bo,

extern void vmw_bo_move_notify(struct ttm_buffer_object *bo,

			       struct ttm_mem_reg *mem);

			       struct ttm_mem_reg *mem);

extern void vmw_bo_swap_notify(struct ttm_buffer_object *bo);

extern void vmw_bo_swap_notify(struct ttm_buffer_object *bo);

extern struct vmw_buffer_object *

vmw_user_bo_noref_lookup(struct ttm_object_file *tfile, u32 handle);



/**

 * vmw_user_bo_noref_release - release a buffer object pointer looked up

 * without reference

 */

static inline void vmw_user_bo_noref_release(void)

{

	ttm_base_object_noref_release();

}







/**

/**

 * Misc Ioctl functionality - vmwgfx_ioctl.c

 * Misc Ioctl functionality - vmwgfx_ioctl.c