Le 11/09/2023 à 15:08, Thomas Zimmermann a écrit :
> 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.
>
> v3:
> * rename fb_pgprotect() to pgprot_framebuffer() (Arnd)
Then maybe the Subject: needs to be changed as well.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> ---
> arch/ia64/include/asm/fb.h | 15 +++++++--------
> arch/m68k/include/asm/fb.h | 19 ++++++++++---------
> arch/mips/include/asm/fb.h | 11 +++++------
> arch/powerpc/include/asm/fb.h | 13 +++++--------
> arch/sparc/include/asm/fb.h | 15 +++++++++------
> arch/x86/include/asm/fb.h | 10 ++++++----
> arch/x86/video/fbdev.c | 15 ++++++++-------
> drivers/video/fbdev/core/fb_chrdev.c | 3 ++-
> include/asm-generic/fb.h | 12 ++++++------
> 9 files changed, 58 insertions(+), 55 deletions(-)
>
> diff --git a/arch/ia64/include/asm/fb.h b/arch/ia64/include/asm/fb.h
> index 1717b26fd423f..7fce0d5423590 100644
> --- a/arch/ia64/include/asm/fb.h
> +++ b/arch/ia64/include/asm/fb.h
> @@ -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)
> {
> diff --git a/arch/m68k/include/asm/fb.h b/arch/m68k/include/asm/fb.h
> index 24273fc7ad917..9941b7434b696 100644
> --- a/arch/m68k/include/asm/fb.h
> +++ b/arch/m68k/include/asm/fb.h
> @@ -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>
>
> diff --git a/arch/mips/include/asm/fb.h b/arch/mips/include/asm/fb.h
> index 18b7226403bad..d98d6681d64ec 100644
> --- a/arch/mips/include/asm/fb.h
> +++ b/arch/mips/include/asm/fb.h
> @@ -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
> diff --git a/arch/powerpc/include/asm/fb.h b/arch/powerpc/include/asm/fb.h
> index 61e3b8806db69..3cecf14d51de8 100644
> --- a/arch/powerpc/include/asm/fb.h
> +++ b/arch/powerpc/include/asm/fb.h
> @@ -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>
>
> diff --git a/arch/sparc/include/asm/fb.h b/arch/sparc/include/asm/fb.h
> index 572ecd3e1cc48..24440c0fda490 100644
> --- a/arch/sparc/include/asm/fb.h
> +++ b/arch/sparc/include/asm/fb.h
> @@ -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);
> diff --git a/arch/x86/include/asm/fb.h b/arch/x86/include/asm/fb.h
> index 23873da8fb77c..c3b9582de7efd 100644
> --- a/arch/x86/include/asm/fb.h
> +++ b/arch/x86/include/asm/fb.h
> @@ -2,12 +2,14 @@
> #ifndef _ASM_X86_FB_H
> #define _ASM_X86_FB_H
>
> +#include <asm/page.h>
> +
> struct fb_info;
> -struct file;
> -struct vm_area_struct;
>
> -void fb_pgprotect(struct file *file, struct vm_area_struct *vma, unsigned long off);
> -#define fb_pgprotect fb_pgprotect
> +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
> diff --git a/arch/x86/video/fbdev.c b/arch/x86/video/fbdev.c
> index 49a0452402e97..1dd6528cc947c 100644
> --- a/arch/x86/video/fbdev.c
> +++ b/arch/x86/video/fbdev.c
> @@ -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)
> {
> diff --git a/drivers/video/fbdev/core/fb_chrdev.c b/drivers/video/fbdev/core/fb_chrdev.c
> index eadb81f53a821..32a7315b4b6dd 100644
> --- a/drivers/video/fbdev/core/fb_chrdev.c
> +++ b/drivers/video/fbdev/core/fb_chrdev.c
> @@ -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);
> }
> diff --git a/include/asm-generic/fb.h b/include/asm-generic/fb.h
> index bb7ee9c70e603..6ccabb400aa66 100644
> --- a/include/asm-generic/fb.h
> +++ b/include/asm-generic/fb.h
> @@ -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
>
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