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Message ID 1515580079-4035-1-git-send-email-timguo@zhaoxin.com (mailing list archive)
State Not Applicable, archived
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Commit Message

TimGuo Jan. 10, 2018, 10:27 a.m. UTC
From 812522018b0f1d9501fbdda4018be9a6fc9c21bf Mon Sep 17 00:00:00 2001
From: TimGuo <timguo@zhaoxin.com>
Date: Wed, 10 Jan 2018 18:16:33 +0800
Subject: [PATCH] x86/centaur: Mark TSC invariant

Centaur CPU has a constant frequency TSC and that TSC
does not stop in C-States. But because the flags are not set for that CPU
the TSC is treated as non constant frequency and assumed to stop in
C-States, which makes it an unreliable and unusable clock source.
Setting those flags tells the kernel that the TSC is usable, so it will
select it over HPET. The effect of this is that reading time stamps (from
kernel or user space) will be faster and more efficient.

Signed-off-by: TimGuo <timguo@zhaoxin.com>
Acked-by: tglx <tglx@linutronix.de>
 arch/x86/kernel/cpu/centaur.c | 4 ++++
 drivers/acpi/processor_idle.c | 1 +
 2 files changed, 5 insertions(+)


This email contains confidential or legally privileged information and is for the sole use of its intended recipient. Any unauthorized review, use, copying or forwarding of this email or the content of this email is strictly prohibited.


Thomas Gleixner Jan. 14, 2018, 12:06 p.m. UTC | #1
On Wed, 10 Jan 2018, TimGuo wrote:

Please be more careful when sending patches. The subject line
of you mail was empty....

Also this patch was copy pasted or whatever into the mail and got white
space damaged by your mail client, so it does not apply.

See Documentation/process/email-clients.txt


diff mbox


diff --git a/arch/x86/kernel/cpu/centaur.c b/arch/x86/kernel/cpu/centaur.c
index 68bc6d9..c578cd2 100644
--- a/arch/x86/kernel/cpu/centaur.c
+++ b/arch/x86/kernel/cpu/centaur.c
@@ -106,6 +106,10 @@  static void early_init_centaur(struct cpuinfo_x86 *c)
 #ifdef CONFIG_X86_64
        set_cpu_cap(c, X86_FEATURE_SYSENTER32);
+       if (c->x86_power & (1 << 8)) {
+               set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
+               set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
+       }

 static void init_centaur(struct cpuinfo_x86 *c)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index d50a7b6..5f0071c 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -207,6 +207,7 @@  static void tsc_check_state(int state)
        switch (boot_cpu_data.x86_vendor) {
        case X86_VENDOR_AMD:
        case X86_VENDOR_INTEL:
+       case X86_VENDOR_CENTAUR:
                 * AMD Fam10h TSC will tick in all
                 * C/P/S0/S1 states when this bit is set.