Commit 775efacb authored by Dave Jones's avatar Dave Jones

[PATCH] Pentium 4 NMI watchdog support

From Mikael via 2.4.
parent 8897452d
......@@ -8,6 +8,7 @@
* Fixes:
* Mikael Pettersson : AMD K7 support for local APIC NMI watchdog.
* Mikael Pettersson : Power Management for local APIC NMI watchdog.
* Mikael Pettersson : Pentium 4 support for local APIC NMI watchdog.
*/
#include <linux/config.h>
......@@ -43,6 +44,32 @@ extern void show_registers(struct pt_regs *regs);
#define P6_EVENT_CPU_CLOCKS_NOT_HALTED 0x79
#define P6_NMI_EVENT P6_EVENT_CPU_CLOCKS_NOT_HALTED
#define MSR_P4_MISC_ENABLE 0x1A0
#define MSR_P4_MISC_ENABLE_PERF_AVAIL (1<<7)
#define MSR_P4_MISC_ENABLE_PEBS_UNAVAIL (1<<12)
#define MSR_P4_PERFCTR0 0x300
#define MSR_P4_CCCR0 0x360
#define P4_ESCR_EVENT_SELECT(N) ((N)<<25)
#define P4_ESCR_OS (1<<3)
#define P4_ESCR_USR (1<<2)
#define P4_CCCR_OVF_PMI (1<<26)
#define P4_CCCR_THRESHOLD(N) ((N)<<20)
#define P4_CCCR_COMPLEMENT (1<<19)
#define P4_CCCR_COMPARE (1<<18)
#define P4_CCCR_REQUIRED (3<<16)
#define P4_CCCR_ESCR_SELECT(N) ((N)<<13)
#define P4_CCCR_ENABLE (1<<12)
/* Set up IQ_COUNTER0 to behave like a clock, by having IQ_CCCR0 filter
CRU_ESCR0 (with any non-null event selector) through a complemented
max threshold. [IA32-Vol3, Section 14.9.9] */
#define MSR_P4_IQ_COUNTER0 0x30C
#define MSR_P4_IQ_CCCR0 0x36C
#define MSR_P4_CRU_ESCR0 0x3B8
#define P4_NMI_CRU_ESCR0 (P4_ESCR_EVENT_SELECT(0x3F)|P4_ESCR_OS|P4_ESCR_USR)
#define P4_NMI_IQ_CCCR0 \
(P4_CCCR_OVF_PMI|P4_CCCR_THRESHOLD(15)|P4_CCCR_COMPLEMENT| \
P4_CCCR_COMPARE|P4_CCCR_REQUIRED|P4_CCCR_ESCR_SELECT(4)|P4_CCCR_ENABLE)
int __init check_nmi_watchdog (void)
{
irq_cpustat_t tmp[NR_CPUS];
......@@ -84,11 +111,11 @@ static int __init setup_nmi_watchdog(char *str)
/*
* If any other x86 CPU has a local APIC, then
* please test the NMI stuff there and send me the
* missing bits. Right now Intel P6 and AMD K7 only.
* missing bits. Right now Intel P6/P4 and AMD K7 only.
*/
if ((nmi == NMI_LOCAL_APIC) &&
(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
(boot_cpu_data.x86 == 6))
(boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15))
nmi_watchdog = nmi;
if ((nmi == NMI_LOCAL_APIC) &&
(boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
......@@ -118,7 +145,15 @@ static void disable_apic_nmi_watchdog(void)
wrmsr(MSR_K7_EVNTSEL0, 0, 0);
break;
case X86_VENDOR_INTEL:
wrmsr(MSR_IA32_EVNTSEL0, 0, 0);
switch (boot_cpu_data.x86) {
case 6:
wrmsr(MSR_P6_EVNTSEL0, 0, 0);
break;
case 15:
wrmsr(MSR_P4_IQ_CCCR0, 0, 0);
wrmsr(MSR_P4_CRU_ESCR0, 0, 0);
break;
}
break;
}
}
......@@ -157,17 +192,22 @@ static inline void nmi_pm_init(void) { }
* Original code written by Keith Owens.
*/
static void __pminit clear_msr_range(unsigned int base, unsigned int n)
{
unsigned int i;
for(i = 0; i < n; ++i)
wrmsr(base+i, 0, 0);
}
static void __pminit setup_k7_watchdog(void)
{
int i;
unsigned int evntsel;
nmi_perfctr_msr = MSR_K7_PERFCTR0;
for(i = 0; i < 4; ++i) {
wrmsr(MSR_K7_EVNTSEL0+i, 0, 0);
wrmsr(MSR_K7_PERFCTR0+i, 0, 0);
}
clear_msr_range(MSR_K7_EVNTSEL0, 4);
clear_msr_range(MSR_K7_PERFCTR0, 4);
evntsel = K7_EVNTSEL_INT
| K7_EVNTSEL_OS
......@@ -184,27 +224,54 @@ static void __pminit setup_k7_watchdog(void)
static void __pminit setup_p6_watchdog(void)
{
int i;
unsigned int evntsel;
nmi_perfctr_msr = MSR_IA32_PERFCTR0;
nmi_perfctr_msr = MSR_P6_PERFCTR0;
for(i = 0; i < 2; ++i) {
wrmsr(MSR_IA32_EVNTSEL0+i, 0, 0);
wrmsr(MSR_IA32_PERFCTR0+i, 0, 0);
}
clear_msr_range(MSR_P6_EVNTSEL0, 2);
clear_msr_range(MSR_P6_PERFCTR0, 2);
evntsel = P6_EVNTSEL_INT
| P6_EVNTSEL_OS
| P6_EVNTSEL_USR
| P6_NMI_EVENT;
wrmsr(MSR_IA32_EVNTSEL0, evntsel, 0);
Dprintk("setting IA32_PERFCTR0 to %08lx\n", -(cpu_khz/nmi_hz*1000));
wrmsr(MSR_IA32_PERFCTR0, -(cpu_khz/nmi_hz*1000), 0);
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);
apic_write(APIC_LVTPC, APIC_DM_NMI);
evntsel |= P6_EVNTSEL0_ENABLE;
wrmsr(MSR_IA32_EVNTSEL0, evntsel, 0);
wrmsr(MSR_P6_EVNTSEL0, evntsel, 0);
}
static int __pminit setup_p4_watchdog(void)
{
unsigned int misc_enable, dummy;
rdmsr(MSR_P4_MISC_ENABLE, misc_enable, dummy);
if (!(misc_enable & MSR_P4_MISC_ENABLE_PERF_AVAIL))
return 0;
nmi_perfctr_msr = MSR_P4_IQ_COUNTER0;
if (!(misc_enable & MSR_P4_MISC_ENABLE_PEBS_UNAVAIL))
clear_msr_range(0x3F1, 2);
/* MSR 0x3F0 seems to have a default value of 0xFC00, but current
docs doesn't fully define it, so leave it alone for now. */
clear_msr_range(0x3A0, 31);
clear_msr_range(0x3C0, 6);
clear_msr_range(0x3C8, 6);
clear_msr_range(0x3E0, 2);
clear_msr_range(MSR_P4_CCCR0, 18);
clear_msr_range(MSR_P4_PERFCTR0, 18);
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);
apic_write(APIC_LVTPC, APIC_DM_NMI);
wrmsr(MSR_P4_IQ_CCCR0, P4_NMI_IQ_CCCR0, 0);
return 1;
}
void __pminit setup_apic_nmi_watchdog (void)
......@@ -216,10 +283,18 @@ void __pminit setup_apic_nmi_watchdog (void)
setup_k7_watchdog();
break;
case X86_VENDOR_INTEL:
if (boot_cpu_data.x86 != 6)
return;
switch (boot_cpu_data.x86) {
case 6:
setup_p6_watchdog();
break;
case 15:
if (!setup_p4_watchdog())
return;
break;
default:
return;
}
break;
default:
return;
}
......@@ -296,6 +371,18 @@ void nmi_watchdog_tick (struct pt_regs * regs)
last_irq_sums[cpu] = sum;
alert_counter[cpu] = 0;
}
if (nmi_perfctr_msr)
if (nmi_perfctr_msr) {
if (nmi_perfctr_msr == MSR_P4_IQ_COUNTER0) {
/*
* P4 quirks:
* - An overflown perfctr will assert its interrupt
* until the OVF flag in its CCCR is cleared.
* - LVTPC is masked on interrupt and must be
* unmasked by the LVTPC handler.
*/
wrmsr(MSR_P4_IQ_CCCR0, P4_NMI_IQ_CCCR0, 0);
apic_write(APIC_LVTPC, APIC_DM_NMI);
}
wrmsr(nmi_perfctr_msr, -(cpu_khz/nmi_hz*1000), -1);
}
}
......@@ -48,8 +48,8 @@
#define MSR_IA32_UCODE_WRITE 0x79
#define MSR_IA32_UCODE_REV 0x8b
#define MSR_IA32_PERFCTR0 0xc1
#define MSR_IA32_PERFCTR1 0xc2
#define MSR_P6_PERFCTR0 0xc1
#define MSR_P6_PERFCTR1 0xc2
#define MSR_IA32_BBL_CR_CTL 0x119
......
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