lkml.org 
[lkml]   [2012]   [Aug]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/mm] x86, cpu: Preset default tlb_flushall_shift on AMD
Commit-ID:  057237bb35a605d795fd787868a1088705f26ee5
Gitweb: http://git.kernel.org/tip/057237bb35a605d795fd787868a1088705f26ee5
Author: Borislav Petkov <borislav.petkov@amd.com>
AuthorDate: Mon, 6 Aug 2012 19:00:39 +0200
Committer: H. Peter Anvin <hpa@zytor.com>
CommitDate: Mon, 6 Aug 2012 19:18:39 -0700

x86, cpu: Preset default tlb_flushall_shift on AMD

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>
---
arch/x86/kernel/cpu/amd.c | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index bcd2008..f7e98a2 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -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 = {

\
 
 \ /
  Last update: 2012-08-07 06:01    [W:0.064 / U:0.104 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site