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fbdev: Replace fb_pgprotect() with pgprot_framebuffer()

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Rename the fbdev mmap helper fb_pgprotect() to pgprot_framebuffer().
The helper sets VMA page-access flags for framebuffers in device I/O
memory.

Also clean up the helper's parameters and return value. Instead of
the VMA instance, pass the individial parameters separately: existing
page-access flags, the VMAs start and end addresses and the offset
in the underlying device memory rsp file. Return the new page-access
flags. These changes align pgprot_framebuffer() with other pgprot_()
functions.

v4:
	* fix commit message (Christophe)
v3:
	* rename fb_pgprotect() to pgprot_framebuffer() (Arnd)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230922080636.26762-3-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2023-09-22 10:04:56 +02:00
parent c205a67d28
commit 052ddf7b86
9 changed files with 59 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/ia64/include/asm/fb.h
View File

@ -8,17 +8,16 @@
#include <asm/page.h>
struct file;
static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
unsigned long off)
static inline pgprot_t pgprot_framebuffer(pgprot_t prot,
unsigned long vm_start, unsigned long vm_end,
unsigned long offset)
{
if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
if (efi_range_is_wc(vm_start, vm_end - vm_start))
return pgprot_writecombine(prot);
else
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
return pgprot_noncached(prot);
}
#define fb_pgprotect fb_pgprotect
#define pgprot_framebuffer pgprot_framebuffer
static inline void fb_memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
{

19
arch/m68k/include/asm/fb.h
View File

@ -5,26 +5,27 @@
#include <asm/page.h>
#include <asm/setup.h>
struct file;
static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
unsigned long off)
static inline pgprot_t pgprot_framebuffer(pgprot_t prot,
unsigned long vm_start, unsigned long vm_end,
unsigned long offset)
{
#ifdef CONFIG_MMU
#ifdef CONFIG_SUN3
pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
pgprot_val(prot) |= SUN3_PAGE_NOCACHE;
#else
if (CPU_IS_020_OR_030)
pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
pgprot_val(prot) |= _PAGE_NOCACHE030;
if (CPU_IS_040_OR_060) {
pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
pgprot_val(prot) &= _CACHEMASK040;
/* Use no-cache mode, serialized */
pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
pgprot_val(prot) |= _PAGE_NOCACHE_S;
}
#endif /* CONFIG_SUN3 */
#endif /* CONFIG_MMU */
return prot;
}
#define fb_pgprotect fb_pgprotect
#define pgprot_framebuffer pgprot_framebuffer
#include <asm-generic/fb.h>

11
arch/mips/include/asm/fb.h
View File

@ -3,14 +3,13 @@
#include <asm/page.h>
struct file;
static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
unsigned long off)
static inline pgprot_t pgprot_framebuffer(pgprot_t prot,
unsigned long vm_start, unsigned long vm_end,
unsigned long offset)
{
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
return pgprot_noncached(prot);
}
#define fb_pgprotect fb_pgprotect
#define pgprot_framebuffer pgprot_framebuffer
/*
* MIPS doesn't define __raw_ I/O macros, so the helpers

13
arch/powerpc/include/asm/fb.h
View File

@ -2,23 +2,20 @@
#ifndef _ASM_FB_H_
#define _ASM_FB_H_
#include <linux/fs.h>
#include <asm/page.h>
static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
unsigned long off)
static inline pgprot_t pgprot_framebuffer(pgprot_t prot,
unsigned long vm_start, unsigned long vm_end,
unsigned long offset)
{
/*
* PowerPC's implementation of phys_mem_access_prot() does
* not use the file argument. Set it to NULL in preparation
* of later updates to the interface.
*/
vma->vm_page_prot = phys_mem_access_prot(NULL, PHYS_PFN(off),
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
return phys_mem_access_prot(NULL, PHYS_PFN(offset), vm_end - vm_start, prot);
}
#define fb_pgprotect fb_pgprotect
#define pgprot_framebuffer pgprot_framebuffer
#include <asm-generic/fb.h>

15
arch/sparc/include/asm/fb.h
View File

@ -4,15 +4,18 @@
#include <linux/io.h>
#include <asm/page.h>
struct fb_info;
struct file;
struct vm_area_struct;
#ifdef CONFIG_SPARC32
static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
unsigned long off)
{ }
#define fb_pgprotect fb_pgprotect
static inline pgprot_t pgprot_framebuffer(pgprot_t prot,
unsigned long vm_start, unsigned long vm_end,
unsigned long offset)
{
return prot;
}
#define pgprot_framebuffer pgprot_framebuffer
#endif
int fb_is_primary_device(struct fb_info *info);

12
arch/x86/include/asm/fb.h
View File

@ -2,12 +2,14 @@
#ifndef _ASM_X86_FB_H
#define _ASM_X86_FB_H
struct fb_info;
struct file;
struct vm_area_struct;
#include <asm/page.h>
void fb_pgprotect(struct file *file, struct vm_area_struct *vma, unsigned long off);
#define fb_pgprotect fb_pgprotect
struct fb_info;
pgprot_t pgprot_framebuffer(pgprot_t prot,
unsigned long vm_start, unsigned long vm_end,
unsigned long offset);
#define pgprot_framebuffer pgprot_framebuffer
int fb_is_primary_device(struct fb_info *info);
#define fb_is_primary_device fb_is_primary_device

15
arch/x86/video/fbdev.c
View File

@ -13,16 +13,17 @@
#include <linux/vgaarb.h>
#include <asm/fb.h>
void fb_pgprotect(struct file *file, struct vm_area_struct *vma, unsigned long off)
pgprot_t pgprot_framebuffer(pgprot_t prot,
unsigned long vm_start, unsigned long vm_end,
unsigned long offset)
{
unsigned long prot;
prot = pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK;
pgprot_val(prot) &= ~_PAGE_CACHE_MASK;
if (boot_cpu_data.x86 > 3)
pgprot_val(vma->vm_page_prot) =
prot | cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS);
pgprot_val(prot) |= cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS);
return prot;
}
EXPORT_SYMBOL(fb_pgprotect);
EXPORT_SYMBOL(pgprot_framebuffer);
int fb_is_primary_device(struct fb_info *info)
{

3
drivers/video/fbdev/core/fb_chrdev.c
View File

@ -365,7 +365,8 @@ static int fb_mmap(struct file *file, struct vm_area_struct *vma)
mutex_unlock(&info->mm_lock);
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
fb_pgprotect(file, vma, start);
vma->vm_page_prot = pgprot_framebuffer(vma->vm_page_prot, vma->vm_start,
vma->vm_end, start);
return vm_iomap_memory(vma, start, len);
}

12
include/asm-generic/fb.h
View File

@ -12,14 +12,14 @@
#include <linux/pgtable.h>
struct fb_info;
struct file;
#ifndef fb_pgprotect
#define fb_pgprotect fb_pgprotect
static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
unsigned long off)
#ifndef pgprot_framebuffer
#define pgprot_framebuffer pgprot_framebuffer
static inline pgprot_t pgprot_framebuffer(pgprot_t prot,
unsigned long vm_start, unsigned long vm_end,
unsigned long offset)
{
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
return pgprot_writecombine(prot);
}
#endif