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drm: Add drm_gem_vram_fill_create_dumb() to create dumb buffers

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The helper function drm_gem_vram_fill_create_dumb() implements most of
struct drm_driver.dumb_create() for GEM-VRAM buffer objects. It's not a
full implementation of the callback, as several driver-specific parameters
are still required.

v4:
	* cleanups from checkpatch.pl
v2:
	* documentation fixes

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20190508082630.15116-5-tzimmermann@suse.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Thomas Zimmermann 2019-05-08 10:26:14 +02:00 committed by Gerd Hoffmann
parent 737000fd9c
commit fed1eec080
2 changed files with 70 additions and 0 deletions
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62
drivers/gpu/drm/drm_gem_vram_helper.c
View File

@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <drm/drm_gem_vram_helper.h>
#include <drm/drm_mode.h>
#include <drm/ttm/ttm_page_alloc.h>
/**
@ -411,6 +412,67 @@ void drm_gem_vram_kunmap(struct drm_gem_vram_object *gbo)
}
EXPORT_SYMBOL(drm_gem_vram_kunmap);
/**
* drm_gem_vram_fill_create_dumb() - \
Helper for implementing &struct drm_driver.dumb_create
* @file: the DRM file
* @dev: the DRM device
* @bdev: the TTM BO device managing the buffer object
* @pg_align: the buffer's alignment in multiples of the page size
* @interruptible: sleep interruptible if waiting for memory
* @args: the arguments as provided to \
&struct drm_driver.dumb_create
*
* This helper function fills &struct drm_mode_create_dumb, which is used
* by &struct drm_driver.dumb_create. Implementations of this interface
* should forwards their arguments to this helper, plus the driver-specific
* parameters.
*
* Returns:
* 0 on success, or
* a negative error code otherwise.
*/
int drm_gem_vram_fill_create_dumb(struct drm_file *file,
struct drm_device *dev,
struct ttm_bo_device *bdev,
unsigned long pg_align,
bool interruptible,
struct drm_mode_create_dumb *args)
{
size_t pitch, size;
struct drm_gem_vram_object *gbo;
int ret;
u32 handle;
pitch = args->width * ((args->bpp + 7) / 8);
size = pitch * args->height;
size = roundup(size, PAGE_SIZE);
if (!size)
return -EINVAL;
gbo = drm_gem_vram_create(dev, bdev, size, pg_align, interruptible);
if (IS_ERR(gbo))
return PTR_ERR(gbo);
ret = drm_gem_handle_create(file, &gbo->gem, &handle);
if (ret)
goto err_drm_gem_object_put_unlocked;
drm_gem_object_put_unlocked(&gbo->gem);
args->pitch = pitch;
args->size = size;
args->handle = handle;
return 0;
err_drm_gem_object_put_unlocked:
drm_gem_object_put_unlocked(&gbo->gem);
return ret;
}
EXPORT_SYMBOL(drm_gem_vram_fill_create_dumb);
/*
* Helpers for struct ttm_bo_driver
*/

8
include/drm/drm_gem_vram_helper.h
View File

@ -8,6 +8,7 @@
#include <drm/ttm/ttm_placement.h>
#include <linux/kernel.h> /* for container_of() */
struct drm_mode_create_dumb;
struct filp;
#define DRM_GEM_VRAM_PL_FLAG_VRAM TTM_PL_FLAG_VRAM
@ -89,6 +90,13 @@ void drm_gem_vram_kunmap_at(struct drm_gem_vram_object *gbo,
struct ttm_bo_kmap_obj *kmap);
void drm_gem_vram_kunmap(struct drm_gem_vram_object *gbo);
int drm_gem_vram_fill_create_dumb(struct drm_file *file,
struct drm_device *dev,
struct ttm_bo_device *bdev,
unsigned long pg_align,
bool interruptible,
struct drm_mode_create_dumb *args);
/*
* Helpers for struct ttm_bo_driver
*/