Commit 1f460b49 authored by Thomas Zimmermann's avatar Thomas Zimmermann Committed by Gerd Hoffmann
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drm: Add simple PRIME helpers for GEM VRAM 



These basic helper functions for GEM VRAM allow for pinning and mapping
GEM VRAM objects via the PRIME interfaces. It's not a full implementation,
but complete enough for generic fbcon.

Signed-off-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20190508082630.15116-6-tzimmermann@suse.de


Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
parent fed1eec0

drivers/gpu/drm/drm_gem_vram_helper.c

+98 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 


#include <drm/drm_gem_vram_helper.h>

#include <drm/drm_mode.h>

#include <drm/drm_prime.h>

#include <drm/ttm/ttm_page_alloc.h>



/**
@@ -571,3 +572,100 @@ int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file, 
	return 0;

}

EXPORT_SYMBOL(drm_gem_vram_driver_dumb_mmap_offset);



/*

 * PRIME helpers for struct drm_driver

 */



/**

 * drm_gem_vram_driver_gem_prime_pin() - \

	Implements &struct drm_driver.gem_prime_pin

 * @gem:	The GEM object to pin

 *

 * Returns:

 * 0 on success, or

 * a negative errno code otherwise.

 */

int drm_gem_vram_driver_gem_prime_pin(struct drm_gem_object *gem)

{

	struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);



	return drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);

}

EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_pin);



/**

 * drm_gem_vram_driver_gem_prime_unpin() - \

	Implements &struct drm_driver.gem_prime_unpin

 * @gem:	The GEM object to unpin

 */

void drm_gem_vram_driver_gem_prime_unpin(struct drm_gem_object *gem)

{

	struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);



	drm_gem_vram_unpin(gbo);

}

EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_unpin);



/**

 * drm_gem_vram_driver_gem_prime_vmap() - \

	Implements &struct drm_driver.gem_prime_vmap

 * @gem:	The GEM object to map

 *

 * Returns:

 * The buffers virtual address on success, or

 * NULL otherwise.

 */

void *drm_gem_vram_driver_gem_prime_vmap(struct drm_gem_object *gem)

{

	struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);

	int ret;

	void *base;



	ret = drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);

	if (ret)

		return NULL;

	base = drm_gem_vram_kmap(gbo, true, NULL);

	if (IS_ERR(base)) {

		drm_gem_vram_unpin(gbo);

		return NULL;

	}

	return base;

}

EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_vmap);



/**

 * drm_gem_vram_driver_gem_prime_vunmap() - \

	Implements &struct drm_driver.gem_prime_vunmap

 * @gem:	The GEM object to unmap

 * @vaddr:	The mapping's base address

 */

void drm_gem_vram_driver_gem_prime_vunmap(struct drm_gem_object *gem,

					  void *vaddr)

{

	struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);



	drm_gem_vram_kunmap(gbo);

	drm_gem_vram_unpin(gbo);

}

EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_vunmap);



/**

 * drm_gem_vram_driver_gem_prime_mmap() - \

	Implements &struct drm_driver.gem_prime_mmap

 * @gem:	The GEM object to map

 * @vma:	The VMA describing the mapping

 *

 * Returns:

 * 0 on success, or

 * a negative errno code otherwise.

 */

int drm_gem_vram_driver_gem_prime_mmap(struct drm_gem_object *gem,

				       struct vm_area_struct *vma)

{

	struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);



	gbo->gem.vma_node.vm_node.start = gbo->bo.vma_node.vm_node.start;

	return drm_gem_prime_mmap(gem, vma);

}

EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_mmap);

include/drm/drm_gem_vram_helper.h

+20 −0
Original line number Diff line number Diff line
@@ -116,5 +116,25 @@ void drm_gem_vram_driver_gem_free_object_unlocked(struct drm_gem_object *gem); 
int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,

					 struct drm_device *dev,

					 uint32_t handle, uint64_t *offset);

/*

 * PRIME helpers for struct drm_driver

 */



int drm_gem_vram_driver_gem_prime_pin(struct drm_gem_object *obj);

void drm_gem_vram_driver_gem_prime_unpin(struct drm_gem_object *obj);

void *drm_gem_vram_driver_gem_prime_vmap(struct drm_gem_object *obj);

void drm_gem_vram_driver_gem_prime_vunmap(struct drm_gem_object *obj,

					  void *vaddr);

int drm_gem_vram_driver_gem_prime_mmap(struct drm_gem_object *obj,

				       struct vm_area_struct *vma);



#define DRM_GEM_VRAM_DRIVER_PRIME \

	.gem_prime_export = drm_gem_prime_export, \

	.gem_prime_import = drm_gem_prime_import, \

	.gem_prime_pin	  = drm_gem_vram_driver_gem_prime_pin, \

	.gem_prime_unpin  = drm_gem_vram_driver_gem_prime_unpin, \

	.gem_prime_vmap	  = drm_gem_vram_driver_gem_prime_vmap, \

	.gem_prime_vunmap = drm_gem_vram_driver_gem_prime_vunmap, \

	.gem_prime_mmap	  = drm_gem_vram_driver_gem_prime_mmap



#endif

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