/*
* P4 specific Machine Check Exception Reporting
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/msr.h>
#include <asm/apic.h>
#include "mce.h"
/* as supported by the P4/Xeon family */
struct intel_mce_extended_msrs {
u32 eax;
u32 ebx;
u32 ecx;
u32 edx;
u32 esi;
u32 edi;
u32 ebp;
u32 esp;
u32 eflags;
u32 eip;
/* u32 *reserved[]; */
};
static int mce_num_extended_msrs = 0;
#ifdef CONFIG_X86_MCE_P4THERMAL
static void unexpected_thermal_interrupt(struct pt_regs *regs)
{
printk(KERN_ERR "CPU%d: Unexpected LVT TMR interrupt!\n",
smp_processor_id());
add_taint(TAINT_MACHINE_CHECK);
}
/* P4/Xeon Thermal transition interrupt handler */
static void intel_thermal_interrupt(struct pt_regs *regs)
{
u32 l, h;
unsigned int cpu = smp_processor_id();
static unsigned long next[NR_CPUS];
ack_APIC_irq();
if (time_after(next[cpu], jiffies))
return;
next[cpu] = jiffies + HZ*5;
rdmsr(MSR_IA32_THERM_STATUS, l, h);
if (l & 0x1) {
printk(KERN_EMERG "CPU%d: Temperature above threshold\n", cpu);
printk(KERN_EMERG "CPU%d: Running in modulated clock mode\n",
cpu);
add_taint(TAINT_MACHINE_CHECK);
} else {
printk(KERN_INFO "CPU%d: Temperature/speed normal\n", cpu);
}
}
/* Thermal interrupt handler for this CPU setup */
static void (*vendor_thermal_interrupt)(struct pt_regs *regs) = unexpected_thermal_interrupt;
fastcall void smp_thermal_interrupt(struct pt_regs *regs)
{
irq_enter();
vendor_thermal_interrupt(regs);
irq_exit();
}
/* P4/Xeon Thermal regulation detect and init */
static void intel_init_thermal(struct cpuinfo_x86 *c)
{
u32 l, h;
unsigned int cpu = smp_processor_id();
/* Thermal monitoring */
if (!cpu_has(c, X86_FEATURE_ACPI))
return; /* -ENODEV */
/* Clock modulation */
if (!cpu_has(c, X86_FEATURE_ACC))
return; /* -ENODEV */
/* first check if its enabled already, in which case there might
* be some SMM goo which handles it, so we can't even put a handler
* since it might be delivered via SMI already -zwanem.
*/
rdmsr (MSR_IA32_MISC_ENABLE, l, h);
h = apic_read(APIC_LVTTHMR);
if ((l & (1<<3)) && (h & APIC_DM_SMI)) {
printk(KERN_DEBUG "CPU%d: Thermal monitoring handled by SMI\n",
cpu);
return; /* -EBUSY */
}
/* check whether a vector already exists, temporarily masked? */
if (h & APIC_VECTOR_MASK) {
printk(KERN_DEBUG "CPU%d: Thermal LVT vector (%#x) already "
"installed\n",
cpu, (h & APIC_VECTOR_MASK));
return; /* -EBUSY */
}
/* The temperature transition interrupt handler setup */
h = THERMAL_APIC_VECTOR; /* our delivery vector */
h |= (APIC_DM_FIXED | APIC_LVT_MASKED); /* we'll mask till we're ready */
apic_write_around(APIC_LVTTHMR, h);
rdmsr (MSR_IA32_THERM_INTERRUPT, l, h);
wrmsr (MSR_IA32_THERM_INTERRUPT, l | 0x03 , h);
/* ok we're good to go... */
vendor_thermal_interrupt = intel_thermal_interrupt;
rdmsr (MSR_IA32_MISC_ENABLE, l, h);
wrmsr (MSR_IA32_MISC_ENABLE, l | (1<<3), h);
l = apic_read (APIC_LVTTHMR);
apic_write_around (APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
printk (KERN_INFO "CPU%d: Thermal monitoring enabled\n", cpu);
return;
}
#endif /* CONFIG_X86_MCE_P4THERMAL */
/* P4/Xeon Extended MCE MSR retrieval, return 0 if unsupported */
static inline int intel_get_extended_msrs(struct intel_mce_extended_msrs *r)
{
u32 h;
if (mce_num_extended_msrs == 0)
goto done;
rdmsr (MSR_IA32_MCG_EAX, r->eax, h);
rdmsr (MSR_IA32_MCG_EBX, r->ebx, h);
rdmsr (MSR_IA32_MCG_ECX, r->ecx, h);
rdmsr (MSR_IA32_MCG_EDX, r->edx, h);
rdmsr (MSR_IA32_MCG_ESI, r->esi, h);
rdmsr (MSR_IA32_MCG_EDI, r->edi, h);
rdmsr (MSR_IA32_MCG_EBP, r->ebp, h);
rdmsr (MSR_IA32_MCG_ESP, r->esp, h);
rdmsr (MSR_IA32_MCG_EFLAGS, r->eflags, h);
rdmsr (MSR_IA32_MCG_EIP, r->eip, h);
/* can we rely on kmalloc to do a dynamic
* allocation for the reserved registers?
*/
done:
return mce_num_extended_msrs;
}
static fastcall void intel_machine_check(struct pt_regs * regs, long error_code)
{
int recover=1;
u32 alow, ahigh, high, low;
u32 mcgstl, mcgsth;
int i;
struct intel_mce_extended_msrs dbg;
rdmsr (MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
if (mcgstl & (1<<0)) /* Recoverable ? */
recover=0;
printk (KERN_EMERG "CPU %d: Machine Check Exception: %08x%08x\n",
smp_processor_id(), mcgsth, mcgstl);
if (intel_get_extended_msrs(&dbg)) {
printk (KERN_DEBUG "CPU %d: EIP: %08x EFLAGS: %08x\n",
smp_processor_id(), dbg.eip, dbg.eflags);
printk (KERN_DEBUG "\teax: %08x ebx: %08x ecx: %08x edx: %08x\n",
dbg.eax, dbg.ebx, dbg.ecx, dbg.edx);
printk (KERN_DEBUG "\tesi: %08x edi: %08x ebp: %08x esp: %08x\n",
dbg.esi, dbg.edi, dbg.ebp, dbg.esp);
}
for (i=0; i<nr_mce_banks; i++) {
rdmsr (MSR_IA32_MC0_STATUS+i*4,low, high);
if (high & (1<<31)) {
if (high & (1<<29))
recover |= 1;
if (high & (1<<25))
recover |= 2;
printk (KERN_EMERG "Bank %d: %08x%08x", i, high, low);
high &= ~(1<<31);
if (high & (1<<27)) {
rdmsr (MSR_IA32_MC0_MISC+i*4, alow, ahigh);
printk ("[%08x%08x]", ahigh, alow);
}
if (high & (1<<26)) {
rdmsr (MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
printk (" at %08x%08x", ahigh, alow);
}
printk ("\n");
}
}
if (recover & 2)
panic ("CPU context corrupt");
if (recover & 1)
panic ("Unable to continue");
printk(KERN_EMERG "Attempting to continue.\n");
/*
* Do not clear the MSR_IA32_MCi_STATUS if the error is not
* recoverable/continuable.This will allow BIOS to look at the MSRs
* for errors if the OS could not log the error.
*/
for (i=0; i<nr_mce_banks; i++) {
u32 msr;
msr = MSR_IA32_MC0_STATUS+i*4;
rdmsr (msr, low, high);
if (high&(1<<31)) {
/* Clear it */
wrmsr(msr, 0UL, 0UL);
/* Serialize */
wmb();
add_taint(TAINT_MACHINE_CHECK);
}
}
mcgstl &= ~(1<<2);
wrmsr (MSR_IA32_MCG_STATUS,mcgstl, mcgsth);
}
void intel_p4_mcheck_init(struct cpuinfo_x86 *c)
{
u32 l, h;
int i;
machine_check_vector = intel_machine_check;
wmb();
printk (KERN_INFO "Intel machine check architecture supported.\n");
rdmsr (MSR_IA32_MCG_CAP, l, h);
if (l & (1<<8)) /* Control register present ? */
wrmsr (MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
nr_mce_banks = l & 0xff;
for (i=0; i<nr_mce_banks; i++) {
wrmsr (MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
wrmsr (MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
}
set_in_cr4 (X86_CR4_MCE);
printk (KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n",
smp_processor_id());
/* Check for P4/Xeon extended MCE MSRs */
rdmsr (MSR_IA32_MCG_CAP, l, h);
if (l & (1<<9)) {/* MCG_EXT_P */
mce_num_extended_msrs = (l >> 16) & 0xff;
printk (KERN_INFO "CPU%d: Intel P4/Xeon Extended MCE MSRs (%d)"
" available\n",
smp_processor_id(), mce_num_extended_msrs);
#ifdef CONFIG_X86_MCE_P4THERMAL
/* Check for P4/Xeon Thermal monitor */
intel_init_thermal(c);
#endif
}
}
