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-rw-r--r--arch/i386/kernel/cpu/perfctr-watchdog.c28
1 files changed, 22 insertions, 6 deletions
diff --git a/arch/i386/kernel/cpu/perfctr-watchdog.c b/arch/i386/kernel/cpu/perfctr-watchdog.c
index 4be488e..93fecd4 100644
--- a/arch/i386/kernel/cpu/perfctr-watchdog.c
+++ b/arch/i386/kernel/cpu/perfctr-watchdog.c
@@ -263,8 +263,8 @@ static int setup_k7_watchdog(unsigned nmi_hz)
unsigned int evntsel;
struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
- perfctr_msr = MSR_K7_PERFCTR0;
- evntsel_msr = MSR_K7_EVNTSEL0;
+ perfctr_msr = wd_ops->perfctr;
+ evntsel_msr = wd_ops->evntsel;
wrmsrl(perfctr_msr, 0UL);
@@ -343,8 +343,8 @@ static int setup_p6_watchdog(unsigned nmi_hz)
unsigned int evntsel;
struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
- perfctr_msr = MSR_P6_PERFCTR0;
- evntsel_msr = MSR_P6_EVNTSEL0;
+ perfctr_msr = wd_ops->perfctr;
+ evntsel_msr = wd_ops->evntsel;
/* KVM doesn't implement this MSR */
if (wrmsr_safe(perfctr_msr, 0, 0) < 0)
@@ -569,8 +569,8 @@ static int setup_intel_arch_watchdog(unsigned nmi_hz)
(ebx & ARCH_PERFMON_UNHALTED_CORE_CYCLES_PRESENT))
return 0;
- perfctr_msr = MSR_ARCH_PERFMON_PERFCTR1;
- evntsel_msr = MSR_ARCH_PERFMON_EVENTSEL1;
+ perfctr_msr = wd_ops->perfctr;
+ evntsel_msr = wd_ops->evntsel;
wrmsrl(perfctr_msr, 0UL);
@@ -605,6 +605,16 @@ static struct wd_ops intel_arch_wd_ops = {
.evntsel = MSR_ARCH_PERFMON_EVENTSEL1,
};
+static struct wd_ops coreduo_wd_ops = {
+ .reserve = single_msr_reserve,
+ .unreserve = single_msr_unreserve,
+ .setup = setup_intel_arch_watchdog,
+ .rearm = p6_rearm,
+ .stop = single_msr_stop_watchdog,
+ .perfctr = MSR_ARCH_PERFMON_PERFCTR0,
+ .evntsel = MSR_ARCH_PERFMON_EVENTSEL0,
+};
+
static void probe_nmi_watchdog(void)
{
switch (boot_cpu_data.x86_vendor) {
@@ -615,6 +625,12 @@ static void probe_nmi_watchdog(void)
wd_ops = &k7_wd_ops;
break;
case X86_VENDOR_INTEL:
+ /* Work around Core Duo (Yonah) errata AE49 where perfctr1
+ doesn't have a working enable bit. */
+ if (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 14) {
+ wd_ops = &coreduo_wd_ops;
+ break;
+ }
if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
wd_ops = &intel_arch_wd_ops;
break;
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