From: Helge Deller Date: Fri, 1 Sep 2023 06:04:31 +0000 (+0200) Subject: parisc: shmparam.h: Document aliasing requirements of PA-RISC X-Git-Tag: v6.6.7~1910^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3f091387a39795812aab4303949bbc9baa22c077;p=platform%2Fkernel%2Flinux-starfive.git parisc: shmparam.h: Document aliasing requirements of PA-RISC Add some documentation why PA-RISC uses SHMLBA and SHM_COLOUR. Signed-off-by: Helge Deller --- diff --git a/arch/parisc/include/asm/shmparam.h b/arch/parisc/include/asm/shmparam.h index 74f74e4d..5a95b0f 100644 --- a/arch/parisc/include/asm/shmparam.h +++ b/arch/parisc/include/asm/shmparam.h @@ -2,6 +2,21 @@ #ifndef _ASMPARISC_SHMPARAM_H #define _ASMPARISC_SHMPARAM_H +/* + * PA-RISC uses virtually indexed & physically tagged (VIPT) caches + * which has strict requirements when two pages to the same physical + * address are accessed through different mappings. Read the section + * "Address Aliasing" in the arch docs for more detail: + * PA-RISC 1.1 (page 3-6): + * https://parisc.wiki.kernel.org/images-parisc/6/68/Pa11_acd.pdf + * PA-RISC 2.0 (page F-5): + * https://parisc.wiki.kernel.org/images-parisc/7/73/Parisc2.0.pdf + * + * For Linux we allow kernel and userspace to map pages on page size + * granularity (SHMLBA) but have to ensure that, if two pages are + * mapped to the same physical address, the virtual and physical + * addresses modulo SHM_COLOUR are identical. + */ #define SHMLBA PAGE_SIZE /* attach addr a multiple of this */ #define SHM_COLOUR 0x00400000 /* shared mappings colouring */