| Message ID | 20230406143019.6709-1-tzimmermann@suse.de |
|---|---|
| Headers | show |
| Series | arch: Consolidate <asm/fb.h> | expand |
On Thu, Apr 6, 2023, at 16:30, Thomas Zimmermann wrote: > Generic implementations of fb_pgprotect() and fb_is_primary_device() > have been in the source code for a long time. Prepare the header file > to make use of them. > > Improve the code by using an inline function for fb_pgprotect() > and by removing include statements. The default mode set by > fb_pgprotect() is now writecombine, which is what most platforms > want. > > Symbols are protected by preprocessor guards. Architectures that > provide a symbol need to define a preprocessor token of the same > name and value. Otherwise the header file will provide a generic > implementation. This pattern has been taken from <asm/io.h>. > > v2: > * use writecombine mappings by default (Arnd) > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Arnd Bergmann <arnd@arndb.de>
On Thu, Apr 6, 2023, at 16:30, Thomas Zimmermann wrote: > + > static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma, > unsigned long off) > { > vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); > } > +#define fb_pgprotect fb_pgprotect I still feel that for architectures like arc that don't have pgprot_writecombine(), it would b best to go with the generic implementation that currently behaves the exact same way. If pgprot_writecombine() gets added in the future, it would cause the architecture to behave as expected rather than introducing the same bug that mips has. Arnd
Am 06.04.23 um 16:43 schrieb Arnd Bergmann: > On Thu, Apr 6, 2023, at 16:30, Thomas Zimmermann wrote: >> + >> static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma, >> unsigned long off) >> { >> vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); >> } >> +#define fb_pgprotect fb_pgprotect > > I still feel that for architectures like arc that don't have > pgprot_writecombine(), it would b best to go with the > generic implementation that currently behaves the exact > same way. If pgprot_writecombine() gets added in the future, > it would cause the architecture to behave as expected rather > than introducing the same bug that mips has. OK, I'll change it. > > Arnd
Various architectures provide <arm/fb.h> with helpers for fbdev framebuffer devices. Share the contained code where possible. There is already <asm-generic/fb.h>, which implements generic (as in 'empty') functions of the fbdev helpers. The header was added in commit aafe4dbed0bf ("asm-generic: add generic versions of common headers"), but never used. Each per-architecture header file declares and/or implements fbdev helpers and defines a preprocessor token for each. The generic header then provides the remaining helpers. It works like the I/O helpers in <asm/io.h>. For PARISC, the architecture helpers are mixed up with helpers for the system's STI graphics firmware. We first move the STI code to appropriate locations under video/ and then move the architecture helper under arch/parisc. For Sparc, there's an additional patch that moves the implementation from the header into a source file. This allows to avoid some include statements in the header file. Built on arm, arm64, m68k, mips, parisc, powerpc, sparc and x86. v2: * make writecombine the default mapping mode (Arnd) * rework fb_pgprotect() on m68k Thomas Zimmermann (19): fbdev: Prepare generic architecture helpers arch/arc: Implement <asm/fb.h> with generic helpers arch/arm: Implement <asm/fb.h> with generic helpers arch/arm64: Implement <asm/fb.h> with generic helpers arch/ia64: Implement <asm/fb.h> with generic helpers arch/loongarch: Implement <asm/fb.h> with generic helpers arch/m68k: Merge variants of fb_pgprotect() into single function arch/m68k: Implement <asm/fb.h> with generic helpers arch/mips: Implement <asm/fb.h> with generic helpers video: Remove trailing whitespaces video: Move HP PARISC STI core code to shared location arch/parisc: Remove trailing whitespaces arch/parisc: Implement fb_is_primary_device() under arch/parisc arch/parisc: Implement <asm/fb.h> with generic helpers arch/powerpc: Implement <asm/fb.h> with generic helpers arch/sh: Implement <asm/fb.h> with generic helpers arch/sparc: Implement fb_is_primary_device() in source file arch/sparc: Implement <asm/fb.h> with generic helpers arch/x86: Implement <asm/fb.h> with generic helpers arch/arc/include/asm/fb.h | 11 +- arch/arm/include/asm/fb.h | 15 +- arch/arm64/include/asm/fb.h | 15 +- arch/ia64/include/asm/fb.h | 11 +- arch/loongarch/include/asm/fb.h | 15 +- arch/m68k/include/asm/fb.h | 22 +-- arch/mips/include/asm/fb.h | 10 +- arch/parisc/Makefile | 4 +- arch/parisc/include/asm/fb.h | 17 +- arch/parisc/video/Makefile | 3 + arch/parisc/video/fbdev.c | 27 +++ arch/powerpc/include/asm/fb.h | 8 +- arch/sh/include/asm/fb.h | 15 +- arch/sparc/Makefile | 1 + arch/sparc/include/asm/fb.h | 26 +-- arch/sparc/video/Makefile | 3 + arch/sparc/video/fbdev.c | 24 +++ arch/x86/include/asm/fb.h | 11 +- drivers/video/Kconfig | 7 + drivers/video/Makefile | 1 + drivers/video/console/Kconfig | 1 + drivers/video/console/Makefile | 4 +- drivers/video/console/sticon.c | 6 +- drivers/video/fbdev/Kconfig | 3 +- drivers/video/fbdev/stifb.c | 158 +++++++++--------- drivers/video/{console => }/sticore.c | 123 ++++++-------- include/asm-generic/fb.h | 23 ++- .../video/fbdev => include/video}/sticore.h | 16 +- 28 files changed, 289 insertions(+), 291 deletions(-) create mode 100644 arch/parisc/video/Makefile create mode 100644 arch/parisc/video/fbdev.c create mode 100644 arch/sparc/video/Makefile create mode 100644 arch/sparc/video/fbdev.c rename drivers/video/{console => }/sticore.c (95%) rename {drivers/video/fbdev => include/video}/sticore.h (99%) base-commit: a7180debb9c631375684f4d717466cfb9f238660 prerequisite-patch-id: 0aa359f6144c4015c140c8a6750be19099c676fb prerequisite-patch-id: c67e5d886a47b7d0266d81100837557fda34cb24 prerequisite-patch-id: d571861118316645b0124ac21260571720b632e2 prerequisite-patch-id: 15c0024c23be42851054ea840eec195f69716c08 prerequisite-patch-id: 441ee4341b183e4577c20a3f3bdebee529d21c34 prerequisite-patch-id: cbc453ee02fae02af22fbfdce56ab732c7a88c36