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[PATCH] x86: Temporarily revert parts of the Core 2 nmi nmi watchdog support

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This makes merging easier.  They are readded a few patches later.

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen
2006-09-26 10:52:26 +02:00
committed by Andi Kleen
parent 874c4fe389
commit b07f8915cd
4 changed files with 6 additions and 178 deletions
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65
arch/i386/kernel/nmi.c
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@@ -24,7 +24,6 @@
#include <asm/smp.h>
#include <asm/nmi.h>
#include <asm/intel_arch_perfmon.h>
#include "mach_traps.h"
@@ -96,9 +95,6 @@ int nmi_active;
(P4_CCCR_OVF_PMI0|P4_CCCR_THRESHOLD(15)|P4_CCCR_COMPLEMENT| \
P4_CCCR_COMPARE|P4_CCCR_REQUIRED|P4_CCCR_ESCR_SELECT(4)|P4_CCCR_ENABLE)
#define ARCH_PERFMON_NMI_EVENT_SEL ARCH_PERFMON_UNHALTED_CORE_CYCLES_SEL
#define ARCH_PERFMON_NMI_EVENT_UMASK ARCH_PERFMON_UNHALTED_CORE_CYCLES_UMASK
#ifdef CONFIG_SMP
/* The performance counters used by NMI_LOCAL_APIC don't trigger when
* the CPU is idle. To make sure the NMI watchdog really ticks on all
@@ -211,8 +207,6 @@ static int __init setup_nmi_watchdog(char *str)
__setup("nmi_watchdog=", setup_nmi_watchdog);
static void disable_intel_arch_watchdog(void);
static void disable_lapic_nmi_watchdog(void)
{
if (nmi_active <= 0)
@@ -222,10 +216,6 @@ static void disable_lapic_nmi_watchdog(void)
wrmsr(MSR_K7_EVNTSEL0, 0, 0);
break;
case X86_VENDOR_INTEL:
if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
disable_intel_arch_watchdog();
break;
}
switch (boot_cpu_data.x86) {
case 6:
if (boot_cpu_data.x86_model > 0xd)
@@ -454,53 +444,6 @@ static int setup_p4_watchdog(void)
return 1;
}
static void disable_intel_arch_watchdog(void)
{
unsigned ebx;
/*
* Check whether the Architectural PerfMon supports
* Unhalted Core Cycles Event or not.
* NOTE: Corresponding bit = 0 in ebp indicates event present.
*/
ebx = cpuid_ebx(10);
if (!(ebx & ARCH_PERFMON_UNHALTED_CORE_CYCLES_PRESENT))
wrmsr(MSR_ARCH_PERFMON_EVENTSEL0, 0, 0);
}
static int setup_intel_arch_watchdog(void)
{
unsigned int evntsel;
unsigned ebx;
/*
* Check whether the Architectural PerfMon supports
* Unhalted Core Cycles Event or not.
* NOTE: Corresponding bit = 0 in ebp indicates event present.
*/
ebx = cpuid_ebx(10);
if ((ebx & ARCH_PERFMON_UNHALTED_CORE_CYCLES_PRESENT))
return 0;
nmi_perfctr_msr = MSR_ARCH_PERFMON_PERFCTR0;
clear_msr_range(MSR_ARCH_PERFMON_EVENTSEL0, 2);
clear_msr_range(MSR_ARCH_PERFMON_PERFCTR0, 2);
evntsel = ARCH_PERFMON_EVENTSEL_INT
| ARCH_PERFMON_EVENTSEL_OS
| ARCH_PERFMON_EVENTSEL_USR
| ARCH_PERFMON_NMI_EVENT_SEL
| ARCH_PERFMON_NMI_EVENT_UMASK;
wrmsr(MSR_ARCH_PERFMON_EVENTSEL0, evntsel, 0);
write_watchdog_counter("INTEL_ARCH_PERFCTR0");
apic_write(APIC_LVTPC, APIC_DM_NMI);
evntsel |= ARCH_PERFMON_EVENTSEL0_ENABLE;
wrmsr(MSR_ARCH_PERFMON_EVENTSEL0, evntsel, 0);
return 1;
}
void setup_apic_nmi_watchdog (void)
{
switch (boot_cpu_data.x86_vendor) {
@@ -510,11 +453,6 @@ void setup_apic_nmi_watchdog (void)
setup_k7_watchdog();
break;
case X86_VENDOR_INTEL:
if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
if (!setup_intel_arch_watchdog())
return;
break;
}
switch (boot_cpu_data.x86) {
case 6:
if (boot_cpu_data.x86_model > 0xd)
@@ -619,8 +557,7 @@ void nmi_watchdog_tick (struct pt_regs * regs)
wrmsr(MSR_P4_IQ_CCCR0, nmi_p4_cccr_val, 0);
apic_write(APIC_LVTPC, APIC_DM_NMI);
}
else if (nmi_perfctr_msr == MSR_P6_PERFCTR0 ||
nmi_perfctr_msr == MSR_ARCH_PERFMON_PERFCTR0) {
else if (nmi_perfctr_msr == MSR_P6_PERFCTR0) {
/* Only P6 based Pentium M need to re-unmask
* the apic vector but it doesn't hurt
* other P6 variant */