Hi,I tested the whole patch set on a LS3A5000(LoongArch)machine with efifb driver,
with both fbtest and fbdev of IGT, The test result say passed and I can not see anything wired happen.
Tested-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx> On 2023/5/4 15:45, Thomas Zimmermann wrote:
Implement framebuffer I/O helpers, such as fb_read*() and fb_write*(), in the architecture's <asm/fb.h> header file or the generic one. The common case has been the use of regular I/O functions, such as __raw_readb() or memset_io(). A few architectures used plain system- memory reads and writes. Sparc used helpers for its SBus. The architectures that used special cases provide the same code in their __raw_*() I/O helpers. So the patch replaces this code with the __raw_*() functions and moves it to <asm-generic/fb.h> for all architectures. v4: * ia64, loongarch, sparc64: add fb_mem*() to arch headers to keep current semantics (Arnd) v3: * implement all architectures with generic helpers * support reordering and native byte order (Geert, Arnd) Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> --- arch/ia64/include/asm/fb.h | 20 +++++++ arch/loongarch/include/asm/fb.h | 21 +++++++ arch/sparc/include/asm/fb.h | 20 +++++++ include/asm-generic/fb.h | 101 ++++++++++++++++++++++++++++++++ include/linux/fb.h | 53 ----------------- 5 files changed, 162 insertions(+), 53 deletions(-) diff --git a/arch/ia64/include/asm/fb.h b/arch/ia64/include/asm/fb.h index 0208f64a0da0..bcf982043a5c 100644 --- a/arch/ia64/include/asm/fb.h +++ b/arch/ia64/include/asm/fb.h @@ -2,7 +2,9 @@ #ifndef _ASM_FB_H_ #define _ASM_FB_H_+#include <linux/compiler.h>#include <linux/efi.h> +#include <linux/string.h>#include <asm/page.h> @@ -18,6 +20,24 @@ static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,} #define fb_pgprotect fb_pgprotect+static inline void fb_memcpy_fromfb(void *to, const volatile void __iomem *from, size_t n)+{ + memcpy(to, (void __force *)from, n); +} +#define fb_memcpy_fromfb fb_memcpy_fromfb + +static inline void fb_memcpy_tofb(volatile void __iomem *to, const void *from, size_t n) +{ + memcpy((void __force *)to, from, n); +} +#define fb_memcpy_tofb fb_memcpy_tofb + +static inline void fb_memset(volatile void __iomem *addr, int c, size_t n) +{ + memset((void __force *)addr, c, n); +} +#define fb_memset fb_memset + #include <asm-generic/fb.h>#endif /* _ASM_FB_H_ */diff --git a/arch/loongarch/include/asm/fb.h b/arch/loongarch/include/asm/fb.h index ff82f20685c8..c6fc7ef374a4 100644 --- a/arch/loongarch/include/asm/fb.h +++ b/arch/loongarch/include/asm/fb.h @@ -5,6 +5,27 @@ #ifndef _ASM_FB_H_ #define _ASM_FB_H_+#include <linux/compiler.h>+#include <linux/string.h> + +static inline void fb_memcpy_fromfb(void *to, const volatile void __iomem *from, size_t n) +{ + memcpy(to, (void __force *)from, n); +} +#define fb_memcpy_fromfb fb_memcpy_fromfb + +static inline void fb_memcpy_tofb(volatile void __iomem *to, const void *from, size_t n) +{ + memcpy((void __force *)to, from, n); +} +#define fb_memcpy_tofb fb_memcpy_tofb + +static inline void fb_memset(volatile void __iomem *addr, int c, size_t n) +{ + memset((void __force *)addr, c, n); +} +#define fb_memset fb_memset + #include <asm-generic/fb.h>
Here works as the past, but why bother cast it to (void __force *) ? why not use __memcpy_fromio, __memcpy_toio and __memset_io directly? I modify it this patch as following, it still works.static inline void fb_memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
{
- memcpy(to, (void __force *)from, n);
+ __memcpy_fromio(to, from, n);
}
#define fb_memcpy_fromio fb_memcpy_fromio
static inline void fb_memcpy_toio(volatile void __iomem *to, const
void *from, size_t n)
{
- memcpy((void __force *)to, from, n);
+ __memcpy_toio(to, from, n);
}
#define fb_memcpy_toio fb_memcpy_toio
static inline void fb_memset_io(volatile void __iomem *addr, int c,
size_t n)
{
- memset((void __force *)addr, c, n);
+ __memset_io(addr, c, n);
}
#define fb_memset fb_memset_io
#endif /* _ASM_FB_H_ */ diff --git a/arch/sparc/include/asm/fb.h b/arch/sparc/include/asm/fb.h index 689ee5c60054..077da91aeba1 100644 --- a/arch/sparc/include/asm/fb.h +++ b/arch/sparc/include/asm/fb.h @@ -2,6 +2,8 @@ #ifndef _SPARC_FB_H_ #define _SPARC_FB_H_+#include <linux/io.h>+ struct fb_info; struct file; struct vm_area_struct; @@ -16,6 +18,24 @@ static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma, int fb_is_primary_device(struct fb_info *info); #define fb_is_primary_device fb_is_primary_device+static inline void fb_memcpy_fromfb(void *to, const volatile void __iomem *from, size_t n)+{ + sbus_memcpy_fromio(to, from, n); +} +#define fb_memcpy_fromfb fb_memcpy_fromfb + +static inline void fb_memcpy_tofb(volatile void __iomem *to, const void *from, size_t n) +{ + sbus_memcpy_toio(to, from, n); +} +#define fb_memcpy_tofb fb_memcpy_tofb + +static inline void fb_memset(volatile void __iomem *addr, int c, size_t n) +{ + sbus_memset_io(addr, c, n); +} +#define fb_memset fb_memset + #include <asm-generic/fb.h>#endif /* _SPARC_FB_H_ */diff --git a/include/asm-generic/fb.h b/include/asm-generic/fb.h index c8af99f5a535..6ef624b3ce12 100644 --- a/include/asm-generic/fb.h +++ b/include/asm-generic/fb.h @@ -30,4 +30,105 @@ static inline int fb_is_primary_device(struct fb_info *info) } #endif+/*+ * I/O helpers for the framebuffer. Prefer these functions over their + * regular counterparts. The regular I/O functions provide in-order + * access and swap bytes to/from little-endian ordering. Neither is + * required for framebuffers. Instead, the helpers read and write + * raw framebuffer data. Independent operations can be reordered for + * improved performance. + */ + +#ifndef fb_readb +static inline u8 fb_readb(const volatile void __iomem *addr) +{ + return __raw_readb(addr); +} +#define fb_readb fb_readb +#endif + +#ifndef fb_readw +static inline u16 fb_readw(const volatile void __iomem *addr) +{ + return __raw_readw(addr); +} +#define fb_readw fb_readw +#endif + +#ifndef fb_readl +static inline u32 fb_readl(const volatile void __iomem *addr) +{ + return __raw_readl(addr); +} +#define fb_readl fb_readl +#endif + +#ifndef fb_readq +#if defined(__raw_readq) +static inline u64 fb_readq(const volatile void __iomem *addr) +{ + return __raw_readq(addr); +} +#define fb_readq fb_readq +#endif +#endif + +#ifndef fb_writeb +static inline void fb_writeb(u8 b, volatile void __iomem *addr) +{ + __raw_writeb(b, addr); +} +#define fb_writeb fb_writeb +#endif + +#ifndef fb_writew +static inline void fb_writew(u16 b, volatile void __iomem *addr) +{ + __raw_writew(b, addr); +} +#define fb_writew fb_writew +#endif + +#ifndef fb_writel +static inline void fb_writel(u32 b, volatile void __iomem *addr) +{ + __raw_writel(b, addr); +} +#define fb_writel fb_writel +#endif + +#ifndef fb_writeq +#if defined(__raw_writeq) +static inline void fb_writeq(u64 b, volatile void __iomem *addr) +{ + __raw_writeq(b, addr); +} +#define fb_writeq fb_writeq +#endif +#endif + +#ifndef fb_memcpy_fromfb +static inline void fb_memcpy_fromfb(void *to, const volatile void __iomem *from, size_t n) +{ + memcpy_fromio(to, from, n); +} +#define fb_memcpy_fromfb fb_memcpy_fromfb +#endif + +#ifndef fb_memcpy_tofb +static inline void fb_memcpy_tofb(volatile void __iomem *to, const void *from, size_t n) +{ + memcpy_toio(to, from, n); +} +#define fb_memcpy_tofb fb_memcpy_tofb +#endif + +#ifndef fb_memset +static inline void fb_memset(volatile void __iomem *addr, int c, size_t n) +{ + memset_io(addr, c, n); +} +#define fb_memset fb_memset +#endif + #endif /* __ASM_GENERIC_FB_H_ */ diff --git a/include/linux/fb.h b/include/linux/fb.h index c0f97160ebbf..eb7e52940c60 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -17,7 +17,6 @@ #include <linux/slab.h>#include <asm/fb.h>-#include <asm/io.h>struct vm_area_struct;struct fb_info; @@ -513,58 +512,6 @@ 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. - */ - -// This will go away -#define fb_readb sbus_readb -#define fb_readw sbus_readw -#define fb_readl sbus_readl -#define fb_readq sbus_readq -#define fb_writeb sbus_writeb -#define fb_writew sbus_writew -#define fb_writel sbus_writel -#define fb_writeq sbus_writeq -#define fb_memset sbus_memset_io -#define fb_memcpy_fromfb sbus_memcpy_fromio -#define fb_memcpy_tofb sbus_memcpy_toio - -#elif defined(__i386__) || defined(__alpha__) || defined(__x86_64__) || \ - defined(__hppa__) || defined(__sh__) || defined(__powerpc__) || \ - defined(__arm__) || defined(__aarch64__) || defined(__mips__) - -#define fb_readb __raw_readb -#define fb_readw __raw_readw -#define fb_readl __raw_readl -#define fb_readq __raw_readq -#define fb_writeb __raw_writeb -#define fb_writew __raw_writew -#define fb_writel __raw_writel -#define fb_writeq __raw_writeq -#define fb_memset memset_io -#define fb_memcpy_fromfb memcpy_fromio -#define fb_memcpy_tofb memcpy_toio - -#else - -#define fb_readb(addr) (*(volatile u8 *) (addr)) -#define fb_readw(addr) (*(volatile u16 *) (addr)) -#define fb_readl(addr) (*(volatile u32 *) (addr)) -#define fb_readq(addr) (*(volatile u64 *) (addr)) -#define fb_writeb(b,addr) (*(volatile u8 *) (addr) = (b)) -#define fb_writew(b,addr) (*(volatile u16 *) (addr) = (b)) -#define fb_writel(b,addr) (*(volatile u32 *) (addr) = (b)) -#define fb_writeq(b,addr) (*(volatile u64 *) (addr) = (b)) -#define fb_memset memset -#define fb_memcpy_fromfb memcpy -#define fb_memcpy_tofb memcpy - -#endif - #define FB_LEFT_POS(p, bpp) (fb_be_math(p) ? (32 - (bpp)) : 0) #define FB_SHIFT_HIGH(p, val, bits) (fb_be_math(p) ? (val) >> (bits) : \ (val) << (bits))
|