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 --- drivers/gpu/drm/drm_gem_vram_helper.c | 62 +++++++++++++++++++++++++++ include/drm/drm_gem_vram_helper.h | 8 ++++ 2 files changed, 70 insertions(+)
diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c index 41f971908b78..461ed20b779b 100644 --- a/drivers/gpu/drm/drm_gem_vram_helper.c +++ b/drivers/gpu/drm/drm_gem_vram_helper.c @@ -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 */ diff --git a/include/drm/drm_gem_vram_helper.h b/include/drm/drm_gem_vram_helper.h index d6a75d860f4e..68edb28d4508 100644 --- a/include/drm/drm_gem_vram_helper.h +++ b/include/drm/drm_gem_vram_helper.h @@ -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 */