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Message-ID: <1320446537.15071.14.camel@sbsiddha-desk.sc.intel.com>
Date: Fri, 04 Nov 2011 15:42:17 -0700
From: Suresh Siddha <suresh.b.siddha@...el.com>
To: Thomas Gleixner <tglx@...utronix.de>,
H Peter Anvin <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
john stultz <johnstul@...ibm.com>
Cc: linux-kernel <linux-kernel@...r.kernel.org>
Subject: [patch] x86, tsc: skip TSC synchronization checks for tsc=reliable
tsc=reliable boot parameter is supposed to skip all the TSC stablility
checks during boot time.
On a 8-socket system where we want to run an experiment with the
"tsc=reliable" boot option, TSC synchronization checks are not
getting skipped and marking the TSC as not stable.
Check for tsc_clocksource_reliable (which is set via tsc=reliable or
for platforms supporting synthetic TSC_RELIABLE feature bit etc)
and when set, skip the TSC synchronization tests during boot.
Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
---
arch/x86/include/asm/tsc.h | 2 ++
arch/x86/kernel/tsc.c | 2 +-
arch/x86/kernel/tsc_sync.c | 4 ++--
3 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
index 83e2efd..15d9915 100644
--- a/arch/x86/include/asm/tsc.h
+++ b/arch/x86/include/asm/tsc.h
@@ -51,6 +51,8 @@ extern int unsynchronized_tsc(void);
extern int check_tsc_unstable(void);
extern unsigned long native_calibrate_tsc(void);
+extern int tsc_clocksource_reliable;
+
/*
* Boot-time check whether the TSCs are synchronized across
* all CPUs/cores:
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index db48336..eee4651 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -35,7 +35,7 @@ static int __read_mostly tsc_unstable;
erroneous rdtsc usage on !cpu_has_tsc processors */
static int __read_mostly tsc_disabled = -1;
-static int tsc_clocksource_reliable;
+int tsc_clocksource_reliable;
/*
* Scheduler clock - returns current time in nanosec units.
*/
diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
index 0aa5fed8..9eba29b 100644
--- a/arch/x86/kernel/tsc_sync.c
+++ b/arch/x86/kernel/tsc_sync.c
@@ -113,7 +113,7 @@ void __cpuinit check_tsc_sync_source(int cpu)
if (unsynchronized_tsc())
return;
- if (boot_cpu_has(X86_FEATURE_TSC_RELIABLE)) {
+ if (tsc_clocksource_reliable) {
if (cpu == (nr_cpu_ids-1) || system_state != SYSTEM_BOOTING)
pr_info(
"Skipped synchronization checks as TSC is reliable.\n");
@@ -172,7 +172,7 @@ void __cpuinit check_tsc_sync_target(void)
{
int cpus = 2;
- if (unsynchronized_tsc() || boot_cpu_has(X86_FEATURE_TSC_RELIABLE))
+ if (unsynchronized_tsc() || tsc_clocksource_reliable)
return;
/*
--
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