Unverified Commit 0992b254 authored by Maíra Canal's avatar Maíra Canal
Browse files

drm/gem: Create a drm_gem_object_init_with_mnt() function 



For some applications, such as applications that uses huge pages, we might
want to have a different mountpoint, for which we pass mount flags that
better match our usecase.

Therefore, create a new function `drm_gem_object_init_with_mnt()` that
allow us to define the tmpfs mountpoint where the GEM object will be
created. If this parameter is NULL, then we fallback to `shmem_file_setup()`.

Signed-off-by: default avatarMaíra Canal <mcanal@igalia.com>
Reviewed-by: default avatarTvrtko Ursulin <tvrtko.ursulin@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240923141348.2422499-5-mcanal@igalia.com
parent 56cf76ed

drivers/gpu/drm/drm_gem.c

+30 −4
Original line number Diff line number Diff line
@@ -114,22 +114,32 @@ drm_gem_init(struct drm_device *dev) 
}



/**

 * drm_gem_object_init - initialize an allocated shmem-backed GEM object

 * drm_gem_object_init_with_mnt - initialize an allocated shmem-backed GEM

 * object in a given shmfs mountpoint

 *

 * @dev: drm_device the object should be initialized for

 * @obj: drm_gem_object to initialize

 * @size: object size

 * @gemfs: tmpfs mount where the GEM object will be created. If NULL, use

 * the usual tmpfs mountpoint (`shm_mnt`).

 *

 * Initialize an already allocated GEM object of the specified size with

 * shmfs backing store.

 */

int drm_gem_object_init(struct drm_device *dev,

			struct drm_gem_object *obj, size_t size)

int drm_gem_object_init_with_mnt(struct drm_device *dev,

				 struct drm_gem_object *obj, size_t size,

				 struct vfsmount *gemfs)

{

	struct file *filp;



	drm_gem_private_object_init(dev, obj, size);



	if (gemfs)

		filp = shmem_file_setup_with_mnt(gemfs, "drm mm object", size,

						 VM_NORESERVE);

	else

		filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);



	if (IS_ERR(filp))

		return PTR_ERR(filp);
@@ -137,6 +147,22 @@ int drm_gem_object_init(struct drm_device *dev, 


	return 0;

}

EXPORT_SYMBOL(drm_gem_object_init_with_mnt);



/**

 * drm_gem_object_init - initialize an allocated shmem-backed GEM object

 * @dev: drm_device the object should be initialized for

 * @obj: drm_gem_object to initialize

 * @size: object size

 *

 * Initialize an already allocated GEM object of the specified size with

 * shmfs backing store.

 */

int drm_gem_object_init(struct drm_device *dev, struct drm_gem_object *obj,

			size_t size)

{

	return drm_gem_object_init_with_mnt(dev, obj, size, NULL);

}

EXPORT_SYMBOL(drm_gem_object_init);



/**

include/drm/drm_gem.h

+3 −0
Original line number Diff line number Diff line
@@ -472,6 +472,9 @@ void drm_gem_object_release(struct drm_gem_object *obj); 
void drm_gem_object_free(struct kref *kref);

int drm_gem_object_init(struct drm_device *dev,

			struct drm_gem_object *obj, size_t size);

int drm_gem_object_init_with_mnt(struct drm_device *dev,

				 struct drm_gem_object *obj, size_t size,

				 struct vfsmount *gemfs);

void drm_gem_private_object_init(struct drm_device *dev,

				 struct drm_gem_object *obj, size_t size);

void drm_gem_private_object_fini(struct drm_gem_object *obj);