Framebuffer mmap on PowerPC

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Hi,

there's a per-architecture function called fb_pgprotect() that sets VMA's vm_page_prot for mmaped framebuffers. Most architectures use a simple implementation based on pgprot_writecomine() [1] or pgprot_noncached(). [2]

On PPC this function uses phys_mem_access_prot() and therefore requires the mmap call's file struct. [3] Removing the file argument would help with simplifying the caller of fb_pgprotect(). [4]

Why is the file even required on PPC?

Is it possible to replace phys_mem_access_prot() with something simpler that does not use the file struct?

Best regards
Thomas


[1] https://elixir.bootlin.com/linux/v6.5/source/include/asm-generic/fb.h#L19 [2] https://elixir.bootlin.com/linux/v6.5/source/arch/mips/include/asm/fb.h#L11 [3] https://elixir.bootlin.com/linux/v6.5/source/arch/powerpc/include/asm/fb.h#L12 [4] https://elixir.bootlin.com/linux/v6.5/source/drivers/video/fbdev/core/fbmem.c#L1299


--
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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