Commit 7eabaa89 authored by Dmitry Osipenko's avatar Dmitry Osipenko
Browse files

drm/gem: Add evict() callback to drm_gem_object_funcs 



Add new common evict() callback to drm_gem_object_funcs and corresponding
drm_gem_object_evict() helper. This is a first step on a way to providing
common GEM-shrinker API for DRM drivers.

Reviewed-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Suggested-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: default avatarDmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://lore.kernel.org/all/20230108210445.3948344-4-dmitry.osipenko@collabora.com/
parent 8ac75246

drivers/gpu/drm/drm_gem.c

+18 −0
Original line number Diff line number Diff line
@@ -1459,3 +1459,21 @@ drm_gem_lru_scan(struct drm_gem_lru *lru, unsigned nr_to_scan, 
	return freed;

}

EXPORT_SYMBOL(drm_gem_lru_scan);



/**

 * drm_gem_evict - helper to evict backing pages for a GEM object

 * @obj: obj in question

 */

int drm_gem_evict(struct drm_gem_object *obj)

{

	dma_resv_assert_held(obj->resv);



	if (!dma_resv_test_signaled(obj->resv, DMA_RESV_USAGE_READ))

		return -EBUSY;



	if (obj->funcs->evict)

		return obj->funcs->evict(obj);



	return 0;

}

EXPORT_SYMBOL(drm_gem_evict);

include/drm/drm_gem.h

+12 −0
Original line number Diff line number Diff line
@@ -164,6 +164,16 @@ struct drm_gem_object_funcs { 
	 */

	int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);



	/**

	 * @evict:

	 *

	 * Evicts gem object out from memory. Used by the drm_gem_object_evict()

	 * helper. Returns 0 on success, -errno otherwise.

	 *

	 * This callback is optional.

	 */

	int (*evict)(struct drm_gem_object *obj);



	/**

	 * @vm_ops:

	 *
@@ -479,4 +489,6 @@ void drm_gem_lru_move_tail(struct drm_gem_lru *lru, struct drm_gem_object *obj); 
unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru, unsigned nr_to_scan,

			       bool (*shrink)(struct drm_gem_object *obj));



int drm_gem_evict(struct drm_gem_object *obj);



#endif /* __DRM_GEM_H__ */