Hi Am 28.04.23 um 15:12 schrieb Sam Ravnborg:
Hi Thomas, On Fri, Apr 28, 2023 at 11:27:11AM +0200, Thomas Zimmermann wrote:Implement framebuffer I/O helpers, such as fb_read*() and fb_write*() with Linux' regular I/O functions. Remove all ifdef cases for the various architectures. Most of the supported architectures use __raw_() I/O functions or treat framebuffer memory like regular memory. This is also implemented by the architectures' I/O function, so we can use them instead. Sparc uses SBus to connect to framebuffer devices. It provides respective implementations of the framebuffer I/O helpers. The involved sbus_() I/O helpers map to the same code as Sparc's regular I/O functions. As with other platforms, we can use those instead. We leave a TODO item to replace all fb_() functions with their regular I/O counterparts throughout the fbdev drivers. Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> --- include/linux/fb.h | 63 +++++++++++----------------------------------- 1 file changed, 15 insertions(+), 48 deletions(-) diff --git a/include/linux/fb.h b/include/linux/fb.h index 08cb47da71f8..4aa9e90edd17 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -15,7 +15,6 @@ #include <linux/list.h> #include <linux/backlight.h> #include <linux/slab.h> -#include <asm/io.h>struct vm_area_struct;struct fb_info; @@ -511,58 +510,26 @@ struct fb_info { */ #define STUPID_ACCELF_TEXT_SHIT-// This will go away-#if defined(__sparc__) - -/* We map all of our framebuffers such that big-endian accesses - * are what we want, so the following is sufficient. +/* + * TODO: Update fbdev drivers to call the I/O helpers directly and + * remove the fb_() tokens. */When the __raw_* variants are used, as Geert points out, then I think the memcpy / memset can be replaced, but the rest seems fine to keep.
I'd either want the regular I/O functions or the fb_() wrappers, but not the __raw_() function. I'd also prefer to keep fb_ in front of memset and memcpy. I'd be happy to have fb_() wrappers that are I/O helpers without ordering guarantees. I'd just wouldn't want them in <linux/fb.h>
Best regards Thomas
My personal opinion is that __raw_* is for macro use etc, and not something to use everywhere. So I like the fb_read/fb_write macros. But that is just my color of the bikeshed. Sam
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)
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