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| author |   Jan Beulich <JBeulich@novell.com> | 2005-06-23 00:08:23 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-23 09:45:09 -0700 |
| commit | 7fbb4f6e6873593a2defb8f66512f55d08d88106 (patch) | |
| tree | 7946f3ca697a5981d4599162572201213f3782f5 /arch | |
| parent | [PATCH] Do not enforce unique IO_APIC_ID check for xAPIC systems (i386) (diff) | |
| download | linux-dev-7fbb4f6e6873593a2defb8f66512f55d08d88106.tar.xz linux-dev-7fbb4f6e6873593a2defb8f66512f55d08d88106.zip | |
[PATCH] adjust i386 watchdog tick calculation
Get the i386 watchdog tick calculation into a state where it can also be used
on CPUs with frequencies beyond 4GHz, and it consolidates the calculation into
a single place (for potential furture adjustments).
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/nmi.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c index 2c0ee9c2d020..da6c46d667cb 100644 --- a/arch/i386/kernel/nmi.c +++ b/arch/i386/kernel/nmi.c @@ -28,8 +28,7 @@ #include <linux/sysctl.h> #include <asm/smp.h> -#include <asm/mtrr.h> -#include <asm/mpspec.h> +#include <asm/div64.h> #include <asm/nmi.h> #include "mach_traps.h" @@ -324,6 +323,16 @@ static void clear_msr_range(unsigned int base, unsigned int n) wrmsr(base+i, 0, 0); } +static inline void write_watchdog_counter(const char *descr) +{ + u64 count = (u64)cpu_khz * 1000; + + do_div(count, nmi_hz); + if(descr) + Dprintk("setting %s to -0x%08Lx\n", descr, count); + wrmsrl(nmi_perfctr_msr, 0 - count); +} + static void setup_k7_watchdog(void) { unsigned int evntsel; @@ -339,8 +348,7 @@ static void setup_k7_watchdog(void) | K7_NMI_EVENT; wrmsr(MSR_K7_EVNTSEL0, evntsel, 0); - Dprintk("setting K7_PERFCTR0 to %08lx\n", -(cpu_khz/nmi_hz*1000)); - wrmsr(MSR_K7_PERFCTR0, -(cpu_khz/nmi_hz*1000), -1); + write_watchdog_counter("K7_PERFCTR0"); apic_write(APIC_LVTPC, APIC_DM_NMI); evntsel |= K7_EVNTSEL_ENABLE; wrmsr(MSR_K7_EVNTSEL0, evntsel, 0); @@ -361,8 +369,7 @@ static void setup_p6_watchdog(void) | P6_NMI_EVENT; wrmsr(MSR_P6_EVNTSEL0, evntsel, 0); - Dprintk("setting P6_PERFCTR0 to %08lx\n", -(cpu_khz/nmi_hz*1000)); - wrmsr(MSR_P6_PERFCTR0, -(cpu_khz/nmi_hz*1000), 0); + write_watchdog_counter("P6_PERFCTR0"); apic_write(APIC_LVTPC, APIC_DM_NMI); evntsel |= P6_EVNTSEL0_ENABLE; wrmsr(MSR_P6_EVNTSEL0, evntsel, 0); @@ -402,8 +409,7 @@ static int setup_p4_watchdog(void) wrmsr(MSR_P4_CRU_ESCR0, P4_NMI_CRU_ESCR0, 0); wrmsr(MSR_P4_IQ_CCCR0, P4_NMI_IQ_CCCR0 & ~P4_CCCR_ENABLE, 0); - Dprintk("setting P4_IQ_COUNTER0 to 0x%08lx\n", -(cpu_khz/nmi_hz*1000)); - wrmsr(MSR_P4_IQ_COUNTER0, -(cpu_khz/nmi_hz*1000), -1); + write_watchdog_counter("P4_IQ_COUNTER0"); apic_write(APIC_LVTPC, APIC_DM_NMI); wrmsr(MSR_P4_IQ_CCCR0, nmi_p4_cccr_val, 0); return 1; @@ -518,7 +524,7 @@ void nmi_watchdog_tick (struct pt_regs * regs) * other P6 variant */ apic_write(APIC_LVTPC, APIC_DM_NMI); } - wrmsr(nmi_perfctr_msr, -(cpu_khz/nmi_hz*1000), -1); + write_watchdog_counter(NULL); } } |