leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

x86, cpu: Preset default tlb_flushall_shift on AMD

Browse Source 
Run the mprotect.c microbenchmark on all our families >= K8 and preset
the flushall shift variable accordingly.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/1344272439-29080-5-git-send-email-bp@amd64.org
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Borislav Petkov 2012-08-06 19:00:39 +02:00 committed by H. Peter Anvin
parent b46882e4c4
commit 057237bb35
1 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/x86/kernel/cpu/amd.c
View File

@ -737,6 +737,17 @@ static unsigned int __cpuinit amd_size_cache(struct cpuinfo_x86 *c,
}
#endif
static void __cpuinit cpu_set_tlb_flushall_shift(struct cpuinfo_x86 *c)
{
if (!cpu_has_invlpg)
return;
tlb_flushall_shift = 5;
if (c->x86 <= 0x11)
tlb_flushall_shift = 4;
}
static void __cpuinit cpu_detect_tlb_amd(struct cpuinfo_x86 *c)
{
u32 ebx, eax, ecx, edx;
@ -788,6 +799,8 @@ static void __cpuinit cpu_detect_tlb_amd(struct cpuinfo_x86 *c)
tlb_lli_2m[ENTRIES] = eax & mask;
tlb_lli_4m[ENTRIES] = tlb_lli_2m[ENTRIES] >> 1;
cpu_set_tlb_flushall_shift(c);
}
static const struct cpu_dev __cpuinitconst amd_cpu_dev = {