Re: [v4,5/6] fbdev: Move framebuffer I/O helpers into <asm/fb.h>

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Hi

Am 04.05.23 um 13:59 schrieb Sui Jingfeng:
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>

Thanks for testing.



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))

--
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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