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Commit 10028c5a authored Nov 30, 2015 by Eric Anholt

drm: Create a driver hook for allocating GEM object structs.



The CMA helpers had no way for a driver to extend the struct with its
own fields.  Since the CMA helpers are mostly "Allocate a
drm_gem_cma_object, then fill in a few fields", it's hard to write as
pure helpers without passing in a driver callback for the allocate
step.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

parent 8005c49d

drivers/gpu/drm/drm_gem_cma_helper.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -59,11 +59,13 @@ __drm_gem_cma_create(struct drm_device *drm, size_t size)
		struct drm_gem_object *gem_obj;
		int ret;

		cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
		if (!cma_obj)
		if (drm->driver->gem_create_object)
		gem_obj = drm->driver->gem_create_object(drm, size);
		else
		gem_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
		if (!gem_obj)
		return ERR_PTR(-ENOMEM);

		gem_obj = &cma_obj->base;
		cma_obj = container_of(gem_obj, struct drm_gem_cma_object, base);

		ret = drm_gem_object_init(drm, gem_obj, size);
		if (ret)

include/drm/drmP.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -580,6 +580,13 @@ struct drm_driver {
		int (gem_open_object) (struct drm_gem_object , struct drm_file *);
		void (gem_close_object) (struct drm_gem_object , struct drm_file *);

		/**
		* Hook for allocating the GEM object struct, for use by core
		* helpers.
		*/
		struct drm_gem_object (gem_create_object)(struct drm_device *dev,
		size_t size);

		/* prime: */
		/* export handle -> fd (see drm_gem_prime_handle_to_fd() helper) */
		int (prime_handle_to_fd)(struct drm_device dev, struct drm_file *file_priv,