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drm/gem-shmem: Compute dumb-buffer sizes with drm_mode_size_dumb()

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Call drm_mode_size_dumb() to compute dumb-buffer scanline pitch and
buffer size. Align the pitch to a multiple of 8.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://lore.kernel.org/r/20250821081918.79786-5-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2025-08-21 10:17:11 +02:00
parent dcacfcd35c
commit 4977dcecb9
1 changed files with 5 additions and 11 deletions
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16
drivers/gpu/drm/drm_gem_shmem_helper.c
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@@ -18,6 +18,7 @@
#include <drm/drm.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_dumb_buffers.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_prime.h>
#include <drm/drm_print.h>
@@ -556,18 +557,11 @@ EXPORT_SYMBOL_GPL(drm_gem_shmem_purge_locked);
int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
u32 min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
int ret;
if (!args->pitch || !args->size) {
args->pitch = min_pitch;
args->size = PAGE_ALIGN(args->pitch * args->height);
} else {
/* ensure sane minimum values */
if (args->pitch < min_pitch)
args->pitch = min_pitch;
if (args->size < args->pitch * args->height)
args->size = PAGE_ALIGN(args->pitch * args->height);
}
ret = drm_mode_size_dumb(dev, args, SZ_8, 0);
if (ret)
return ret;
return drm_gem_shmem_create_with_handle(file, dev, args->size, &args->handle);
}