1 files changed, 271 insertions, 0 deletions
diff --git a/arch/i386/kernel/cpu/mcheck/p4.c b/arch/i386/kernel/cpu/mcheck/p4.c
new file mode 100644
index 00000000000..8b16ceb929b
--- /dev/null
+++ b/arch/i386/kernel/cpu/mcheck/p4.c
@@ -0,0 +1,271 @@
+/*
+ * P4 specific Machine Check Exception Reporting
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/config.h>
+#include <linux/irq.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 __init 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 __init 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
+	}
+}