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| author | Andi Kleen <ak@suse.de> | 2005-09-29 22:05:55 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-29 15:41:42 -0700 |
| commit | 7d318d774789657c37a5e994a4a2cf59d4879ae7 (patch) | |
| tree | ac48b3dd2cd7c8bedb049f4062ef9959bc5c73bb /arch/x86_64 | |
| parent | 5acbc5cb507e6c381b70093b1081854708e82b16 (diff) | |
| download | linux-7d318d774789657c37a5e994a4a2cf59d4879ae7.tar.gz linux-7d318d774789657c37a5e994a4a2cf59d4879ae7.tar.bz2 linux-7d318d774789657c37a5e994a4a2cf59d4879ae7.zip | |
[PATCH] Fix up TLB flush filter disabling
I checked with AMD and they requested to only disable it for family 15.
Also disable it for i386 too. And some style fixes.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64')
| -rw-r--r-- | arch/x86_64/kernel/setup.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c index 238f73e1a834..257f5ba17902 100644 --- a/arch/x86_64/kernel/setup.c +++ b/arch/x86_64/kernel/setup.c @@ -831,8 +831,6 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c) #endif } -#define HWCR 0xc0010015 - static int __init init_amd(struct cpuinfo_x86 *c) { int r; @@ -841,14 +839,18 @@ static int __init init_amd(struct cpuinfo_x86 *c) #ifdef CONFIG_SMP unsigned long value; - // Disable TLB flush filter by setting HWCR.FFDIS: - // bit 6 of msr C001_0015 - // - // Errata 63 for SH-B3 steppings - // Errata 122 for all(?) steppings - rdmsrl(HWCR, value); - value |= 1 << 6; - wrmsrl(HWCR, value); + /* + * Disable TLB flush filter by setting HWCR.FFDIS on K8 + * bit 6 of msr C001_0015 + * + * Errata 63 for SH-B3 steppings + * Errata 122 for all steppings (F+ have it disabled by default) + */ + if (c->x86 == 15) { + rdmsrl(MSR_K8_HWCR, value); + value |= 1 << 6; + wrmsrl(MSR_K8_HWCR, value); + } #endif /* Bit 31 in normal CPUID used for nonstandard 3DNow ID; |