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| author | Vladimir Kondratyev <wulf@FreeBSD.org> | 2021-12-08 21:12:51 +0000 |
|---|---|---|
| committer | Vladimir Kondratyev <wulf@FreeBSD.org> | 2022-01-10 19:49:38 +0000 |
| commit | 98b129783c478616f59b3b9c9576a303f7ed67de (patch) | |
| tree | 0bb870855e43f2ce8b52464a0742b68e0bfa6414 /sys/compat/linuxkpi/common/include/linux/io.h | |
| parent | 1456816425c35ab1ded97f9b53f17c87ae4a701f (diff) | |
| download | src-98b129783c478616f59b3b9c9576a303f7ed67de.tar.gz src-98b129783c478616f59b3b9c9576a303f7ed67de.zip | |
LinuxKPI: Import MTRR support functions from drm-kmod
They are superseded by PAT and mostly useless nowadays but still can be
used on Pentium III/IV era processors. Unlike drm-kmod version, this one
ignores MTRR if PAT is available that fixes confusing "Failed to add WC
MTRR for [0xXXXX-0xYYYY]: 22; performance may suffer" message often
appearing during drm-kmod initialization process.
MFC after: 1 week
Reviewed by: hselasky, manu
Differential Revision: https://reviews.freebsd.org/D33561
Diffstat (limited to 'sys/compat/linuxkpi/common/include/linux/io.h')
| -rw-r--r-- | sys/compat/linuxkpi/common/include/linux/io.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/io.h b/sys/compat/linuxkpi/common/include/linux/io.h index e402ebed0665..08e1635b70ac 100644 --- a/sys/compat/linuxkpi/common/include/linux/io.h +++ b/sys/compat/linuxkpi/common/include/linux/io.h @@ -482,4 +482,12 @@ memunmap(void *addr) iounmap(addr); } +#define __MTRR_ID_BASE 1 +int lkpi_arch_phys_wc_add(unsigned long, unsigned long); +void lkpi_arch_phys_wc_del(int); +#define arch_phys_wc_add(...) lkpi_arch_phys_wc_add(__VA_ARGS__) +#define arch_phys_wc_del(...) lkpi_arch_phys_wc_del(__VA_ARGS__) +#define arch_phys_wc_index(x) \ + (((x) < __MTRR_ID_BASE) ? -1 : ((x) - __MTRR_ID_BASE)) + #endif /* _LINUX_IO_H_ */ |