linux/include/drm/drm_fbdev_shmem.h

/* SPDX-License-Identifier: MIT */

#ifndef DRM_FBDEV_SHMEM_H
#define DRM_FBDEV_SHMEM_H

struct drm_device;

#ifdef CONFIG_DRM_FBDEV_EMULATION
void drm_fbdev_shmem_setup(struct drm_device *dev, unsigned int preferred_bpp);
#else
static inline void drm_fbdev_shmem_setup(struct drm_device *dev, unsigned int preferred_bpp)
{ }
#endif

#endif
drm/fbdev: Add fbdev-shmem Add an fbdev emulation for SHMEM-based memory managers. The code is similar to fbdev-generic, but does not require an additional shadow buffer for mmap(). Fbdev-shmem operates directly on the buffer object's SHMEM pages. Fbdev's deferred-I/O mechanism updates the hardware state on write operations. The memory pages of GEM SHMEM cannot be detected by fbdefio. Therefore fbdev-shmem implements the .get_page() hook in struct fb_deferred_io. The fbdefio helpers call this hook to retrieve the page directly from fbdev-shmem instead of trying to detect it internally. v3: - clarify on get_page mechanism in commit description (Javier) v2: - use drm_driver_legacy_fb_format() (Geert) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240419083331.7761-9-tzimmermann@suse.de 2024-04-19 16:29:01 +08:00			`/* SPDX-License-Identifier: MIT */`

			`#ifndef DRM_FBDEV_SHMEM_H`
			`#define DRM_FBDEV_SHMEM_H`

			`struct drm_device;`

			`#ifdef CONFIG_DRM_FBDEV_EMULATION`
			`void drm_fbdev_shmem_setup(struct drm_device *dev, unsigned int preferred_bpp);`
			`#else`
			`static inline void drm_fbdev_shmem_setup(struct drm_device *dev, unsigned int preferred_bpp)`
			`{ }`
			`#endif`

			`#endif`