[PATCH v6 05/25] drm/gem-vram: Compute dumb-buffer sizes with drm_mode_size_dumb()
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2025-08-21 08:22:28
Also in:
dri-devel, imx, intel-xe, linux-arm-msm, linux-mediatek, linux-renesas-soc, linux-rockchip, linux-samsung-soc, linux-tegra, nouveau, xen-devel
Subsystem:
drm drivers, drm drivers and misc gpu patches, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds
Call drm_mode_size_dumb() to compute dumb-buffer scanline pitch and buffer size. Inline code from drm_gem_vram_fill_create_dumb() without the existing size computation. Align the pitch to a multiple of 8. Only hibmc and vboxvideo use gem-vram. Hibmc invokes the call to drm_gem_vram_fill_create_dumb() directly and is therefore not affected. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> --- drivers/gpu/drm/drm_gem_vram_helper.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index b04cde4a60e7..dd4537bf63dc 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c@@ -7,6 +7,7 @@ #include <drm/drm_debugfs.h> #include <drm/drm_device.h> #include <drm/drm_drv.h> +#include <drm/drm_dumb_buffers.h> #include <drm/drm_file.h> #include <drm/drm_framebuffer.h> #include <drm/drm_gem_atomic_helper.h>
@@ -545,10 +546,31 @@ int drm_gem_vram_driver_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args) { + struct drm_gem_vram_object *gbo; + int ret; + if (WARN_ONCE(!dev->vram_mm, "VRAM MM not initialized")) return -EINVAL; - return drm_gem_vram_fill_create_dumb(file, dev, 0, 0, args); + ret = drm_mode_size_dumb(dev, args, SZ_8, 0); + if (ret) + return ret; + + gbo = drm_gem_vram_create(dev, args->size, 0); + if (IS_ERR(gbo)) + return PTR_ERR(gbo); + + ret = drm_gem_handle_create(file, &gbo->bo.base, &args->handle); + if (ret) + goto err_drm_gem_object_put; + + drm_gem_object_put(&gbo->bo.base); + + return 0; + +err_drm_gem_object_put: + drm_gem_object_put(&gbo->bo.base); + return ret; } EXPORT_SYMBOL(drm_gem_vram_driver_dumb_create);
--
2.50.1