linux-toradex.git/include/linux/fb.h, branch v6.6-rc5

fbdev: Update fbdev source file paths

2023-08-31T22:29:34+00:00

The files fbmem.c, fb_defio.c, fbsysfs.c, fbmon.c, modedb.c, and
fbcmap.c were moved. Drop the path and just keep the file name.

Reported by kalekale in #kernel (Libera IRC).

Fixes: f7018c213502 ("video: move fbdev to drivers/video/fbdev")
Fixes: 19757fc8432a ("fbdev: move fbdev core files to separate directory")
Signed-off-by: Jonathan Neuschäfer 
Signed-off-by: Helge Deller

fbdev: Align deferred I/O with naming of helpers

2023-07-31T18:07:24+00:00

Deferred-I/O generator macros generate callbacks for struct fb_ops
that operate on memory ranges in I/O address space or system address
space. Rename the macros to use the _IOMEM_ and _SYSMEM_ infixes of
their underlying helpers. Adapt all users. No functional changes.

Signed-off-by: Thomas Zimmermann 
Reviewed-by: Sam Ravnborg 
Acked-by: Helge Deller 
Link: https://patchwork.freedesktop.org/patch/msgid/20230729193157.15446-5-tzimmermann@suse.de

fbdev: Use _DMAMEM_ infix for DMA-memory helpers

2023-07-31T18:07:18+00:00

Change the infix for fbdev's DMA-memory helpers from _DMA_ to
_DMAMEM_. The helpers perform operations within DMA-able memory,
but they don't perform DMA operations. Naming should make this
clear. Adapt all users. No functional changes.

Signed-off-by: Thomas Zimmermann 
Reviewed-by: Sam Ravnborg 
Acked-by: Helge Deller 
Link: https://patchwork.freedesktop.org/patch/msgid/20230729193157.15446-4-tzimmermann@suse.de

fbdev: Use _SYSMEM_ infix for system-memory helpers

2023-07-31T18:07:15+00:00

Change the infix for fbdev's system-memory helpers from _SYS_ to
_SYSMEM_. The helpers perform operations within system memory, but
not on the state of the operating system itself. Naming should make
this clear. Adapt all users. No functional changes.

Suggested-by: Helge Deller 
Signed-off-by: Thomas Zimmermann 
Reviewed-by: Sam Ravnborg 
Acked-by: Helge Deller 
Link: https://patchwork.freedesktop.org/patch/msgid/20230729193157.15446-3-tzimmermann@suse.de

fbdev: Use _IOMEM_ infix for I/O-memory helpers

2023-07-31T18:06:52+00:00

Change the infix for fbdev's I/O-memory helpers from _IO_ to _IOMEM_
to distiguish them from other types of I/O, such as file operations.
The helpers operate on memory ranges in the I/O address space and the
naming should make this clear. Adapt all users. No functional changes.

Suggested-by: Helge Deller 
Signed-off-by: Thomas Zimmermann 
Reviewed-by: Sam Ravnborg 
Acked-by: Helge Deller 
Link: https://patchwork.freedesktop.org/patch/msgid/20230729193157.15446-2-tzimmermann@suse.de

fbdev: Harmonize some comments in

2023-07-24T18:14:43+00:00

Make the comments for I/O, system and DMA memory say the same.
Makes the header file's structure more obvious.

Suggested-by: Javier Martinez Canillas 
Signed-off-by: Thomas Zimmermann 
Reviewed-by: Javier Martinez Canillas 
Link: https://patchwork.freedesktop.org/patch/msgid/20230707083422.18691-13-tzimmermann@suse.de

fbdev: Remove FB_DEFAULT_SYS_OPS

2023-07-24T18:14:43+00:00

Remove the initializer macro FB_DEFAULT_SYS_OPS and its helper macro
__FB_DEFAULT_SYS_OPS_MMAP. There are no users.

Signed-off-by: Thomas Zimmermann 
Reviewed-by: Javier Martinez Canillas 
Acked-by: Maxime Ripard 
Cc: Helge Deller  (maintainer:FRAMEBUFFER LAYER)
Link: https://patchwork.freedesktop.org/patch/msgid/20230707083422.18691-12-tzimmermann@suse.de

fbdev: Add fb_ops init macros for framebuffers in DMA-able memory

2023-07-24T18:14:29+00:00

Add initializer macros for struct fb_ops for framebuffers in DMA-able
memory areas. Also add a corresponding Kconfig token. As of now, this
is equivalent to system framebuffers and mostly useful for labeling
drivers correctly.

A later patch may add a generic DMA-specific mmap operation. Linux
offers a number of dma_mmap_*() helpers for different use cases.

Signed-off-by: Thomas Zimmermann 
Reviewed-by: Javier Martinez Canillas 
Acked-by: Maxime Ripard 
Cc: Helge Deller 
Link: https://patchwork.freedesktop.org/patch/msgid/20230707083422.18691-2-tzimmermann@suse.de

fbdev: Remove FBINFO_DEFAULT and FBINFO_FLAG_DEFAULT

2023-07-24T14:50:39+00:00

Remove the unused flags FBINFO_DEFAULT and FBINFO_FLAG_DEFAULT. No
functional changes.

Signed-off-by: Thomas Zimmermann 
Acked-by: Sam Ravnborg 
Cc: Helge Deller 
Link: https://patchwork.freedesktop.org/patch/msgid/20230715185343.7193-18-tzimmermann@suse.de

fbdev: Make support for userspace interfaces configurable

2023-06-27T07:58:51+00:00

Add Kconfig option CONFIG_FB_DEVICE and make the virtual fbdev
device optional. If the new option has not been selected, fbdev
does not create files in devfs, sysfs or procfs.

Most modern Linux systems run a DRM-based graphics stack that uses
the kernel's framebuffer console, but has otherwise deprecated fbdev
support. Yet fbdev userspace interfaces are still present.

The option makes it possible to use the fbdev subsystem as console
implementation without support for userspace. This closes potential
entry points to manipulate kernel or I/O memory via framebuffers. It
also prevents the execution of driver code via ioctl or sysfs, both
of which might allow malicious software to exploit bugs in the fbdev
code.

A small number of fbdev drivers require struct fbinfo.dev to be
initialized, usually for the support of sysfs interface. Make these
drivers depend on FB_DEVICE. They can later be fixed if necessary.

v3:
	* effect -> affect in Kconfig help (Daniel)
v2:
	* set FB_DEVICE default to y (Geert)
	* comment on {get,put}_device() (Sam)
	* Kconfig fixes (Sam)
	* add TODO item about FB_DEVICE dependencies (Sam)

Signed-off-by: Thomas Zimmermann 
Acked-by: Greg Kroah-Hartman 
Reviewed-by: Sam Ravnborg 
Link: https://patchwork.freedesktop.org/patch/msgid/20230613110953.24176-39-tzimmermann@suse.de