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authorAristeu Rozanski <arozansk@redhat.com>2008-08-14 16:32:15 -0400
committerIngo Molnar <mingo@elte.hu>2008-08-15 07:58:33 -0400
commitdcc984166870150709f0c645b521a47becd9a047 (patch)
tree6e91d5a84279a5d93aa4ea045170b3b564b929e5 /arch/x86/kernel/cpu/perfctr-watchdog.c
parent975439fe73d1f0f7ce8c235c66783bd34dc459c3 (diff)
x86, perfctr: don't use CCCR_OVF_PMI1 on Pentium 4Ds
Currently, setup_p4_watchdog() use CCCR_OVF_PMI1 to enable the counter overflow interrupts to the second logical core. But this bit doesn't work on Pentium 4 Ds (model 4, stepping 4) and this patch avoids its use on these processors. Tested on 4 different machines that have this specific model with success. Signed-off-by: Aristeu Rozanski <aris@redhat.com> Cc: jvillalovos@redhat.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu/perfctr-watchdog.c')
-rw-r--r--arch/x86/kernel/cpu/perfctr-watchdog.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/perfctr-watchdog.c b/arch/x86/kernel/cpu/perfctr-watchdog.c
index de7439f82b92..05cc22dbd4ff 100644
--- a/arch/x86/kernel/cpu/perfctr-watchdog.c
+++ b/arch/x86/kernel/cpu/perfctr-watchdog.c
@@ -478,7 +478,13 @@ static int setup_p4_watchdog(unsigned nmi_hz)
478 perfctr_msr = MSR_P4_IQ_PERFCTR1; 478 perfctr_msr = MSR_P4_IQ_PERFCTR1;
479 evntsel_msr = MSR_P4_CRU_ESCR0; 479 evntsel_msr = MSR_P4_CRU_ESCR0;
480 cccr_msr = MSR_P4_IQ_CCCR1; 480 cccr_msr = MSR_P4_IQ_CCCR1;
481 cccr_val = P4_CCCR_OVF_PMI1 | P4_CCCR_ESCR_SELECT(4); 481
482 /* Pentium 4 D processors don't support P4_CCCR_OVF_PMI1 */
483 if (boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_mask == 4)
484 cccr_val = P4_CCCR_OVF_PMI0;
485 else
486 cccr_val = P4_CCCR_OVF_PMI1;
487 cccr_val |= P4_CCCR_ESCR_SELECT(4);
482 } 488 }
483 489
484 evntsel = P4_ESCR_EVENT_SELECT(0x3F) 490 evntsel = P4_ESCR_EVENT_SELECT(0x3F)