[PATCH] [PATCH] Intel thermal monitor for x86_64
From: Zwane Mwaikambo
Date: Mon Jan 03 2005 - 07:42:52 EST
Patch adds support for notification of overheating conditions on intel
x86_64 processors. Tested on EM64T, test booted on AMD64.
Hardware courtesy of Intel Corporation
Signed-off-by: Zwane Mwaikambo <zwane@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxx>
---
arch/x86_64/Kconfig | 7 +++
arch/x86_64/kernel/Makefile | 1 +
arch/x86_64/kernel/entry.S | 3 ++
arch/x86_64/kernel/i8259.c | 2 +
arch/x86_64/kernel/mce.c | 14 +++++-
arch/x86_64/kernel/mce_intel.c | 99 ++++++++++++++++++++++++++++++++++++++++++
arch/x86_64/kernel/traps.c | 4 ++
include/asm-x86_64/mce.h | 13 ++++++
8 files changed, 142 insertions(+), 1 deletion(-)
create mode 100644 arch/x86_64/kernel/mce_intel.c
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 4ffa04271050..bc317049ebed 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -338,6 +338,13 @@ config X86_MCE
machine check error logs. See
ftp://ftp.x86-64.org/pub/linux/tools/mcelog
+config X86_MCE_INTEL
+ bool "Intel MCE features"
+ depends on X86_MCE && X86_LOCAL_APIC
+ default y
+ help
+ Additional support for intel specific MCE features such as
+ the thermal monitor.
endmenu
#
diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile
index 2c0f3af82e5e..96a5111e96c6 100644
--- a/arch/x86_64/kernel/Makefile
+++ b/arch/x86_64/kernel/Makefile
@@ -10,6 +10,7 @@ obj-y := process.o semaphore.o signal.o entry.o traps.o irq.o \
setup64.o bootflag.o e820.o reboot.o warmreboot.o quirks.o
obj-$(CONFIG_X86_MCE) += mce.o
+obj-$(CONFIG_X86_MCE_INTEL) += mce_intel.o
obj-$(CONFIG_MTRR) += ../../i386/kernel/cpu/mtrr/
obj-$(CONFIG_ACPI_BOOT) += acpi/
obj-$(CONFIG_X86_MSR) += msr.o
diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index d8d906a7d8e1..ca050e729a85 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -538,6 +538,9 @@ retint_kernel:
CFI_ENDPROC
.endm
+ENTRY(thermal_interrupt)
+ apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt
+
#ifdef CONFIG_SMP
ENTRY(reschedule_interrupt)
apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt
diff --git a/arch/x86_64/kernel/i8259.c b/arch/x86_64/kernel/i8259.c
index 7929a2e534a6..04e6fdab46b6 100644
--- a/arch/x86_64/kernel/i8259.c
+++ b/arch/x86_64/kernel/i8259.c
@@ -476,6 +476,7 @@ void error_interrupt(void);
void reschedule_interrupt(void);
void call_function_interrupt(void);
void invalidate_interrupt(void);
+void thermal_interrupt(void);
static void setup_timer(void)
{
@@ -550,6 +551,7 @@ void __init init_IRQ(void)
/* IPI for generic function call */
set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
#endif
+ set_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
#ifdef CONFIG_X86_LOCAL_APIC
/* self generated IPI for local APIC timer */
diff --git a/arch/x86_64/kernel/mce.c b/arch/x86_64/kernel/mce.c
index 5da150baf25e..6e717e470460 100644
--- a/arch/x86_64/kernel/mce.c
+++ b/arch/x86_64/kernel/mce.c
@@ -43,7 +43,7 @@ struct mce_log mcelog = {
MCE_LOG_LEN,
};
-static void mce_log(struct mce *mce)
+void mce_log(struct mce *mce)
{
unsigned next, entry;
mce->finished = 0;
@@ -305,6 +305,17 @@ static void __init mce_cpu_quirks(struct cpuinfo_x86 *c)
}
}
+static void __init mce_cpu_features(struct cpuinfo_x86 *c)
+{
+ switch (c->x86_vendor) {
+ case X86_VENDOR_INTEL:
+ mce_intel_feature_init(c);
+ break;
+ default:
+ break;
+ }
+}
+
/*
* Called for each booted CPU to set up machine checks.
* Must be called with preempt off.
@@ -321,6 +332,7 @@ void __init mcheck_init(struct cpuinfo_x86 *c)
return;
mce_init(NULL);
+ mce_cpu_features(c);
}
/*
diff --git a/arch/x86_64/kernel/mce_intel.c b/arch/x86_64/kernel/mce_intel.c
new file mode 100644
index 000000000000..4db9a640069f
--- /dev/null
+++ b/arch/x86_64/kernel/mce_intel.c
@@ -0,0 +1,99 @@
+/*
+ * Intel specific MCE features.
+ * Copyright 2004 Zwane Mwaikambo <zwane@xxxxxxxxxxxxx>
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/percpu.h>
+#include <asm/processor.h>
+#include <asm/msr.h>
+#include <asm/mce.h>
+#include <asm/hw_irq.h>
+
+static DEFINE_PER_CPU(unsigned long, next_check);
+
+asmlinkage void smp_thermal_interrupt(void)
+{
+ struct mce m;
+
+ ack_APIC_irq();
+
+ irq_enter();
+ if (time_before(jiffies, __get_cpu_var(next_check)))
+ goto done;
+
+ __get_cpu_var(next_check) = jiffies + HZ*300;
+ memset(&m, 0, sizeof(m));
+ m.cpu = smp_processor_id();
+ m.bank = MCE_THERMAL_BANK;
+ rdtscll(m.tsc);
+ rdmsrl(MSR_IA32_THERM_STATUS, m.status);
+ if (m.status & 0x1) {
+ printk(KERN_EMERG
+ "CPU%d: Temperature above threshold, cpu clock throttled\n", m.cpu);
+ add_taint(TAINT_MACHINE_CHECK);
+ } else {
+ printk(KERN_EMERG "CPU%d: Temperature/speed normal\n", m.cpu);
+ }
+
+ mce_log(&m);
+done:
+ irq_exit();
+}
+
+static void __init intel_init_thermal(struct cpuinfo_x86 *c)
+{
+ u32 l, h;
+ int tm2 = 0;
+ unsigned int cpu = smp_processor_id();
+
+ if (!cpu_has(c, X86_FEATURE_ACPI))
+ return;
+
+ if (!cpu_has(c, X86_FEATURE_ACC))
+ return;
+
+ /* first check if TM1 is already enabled by the BIOS, 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.
+ */
+ 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;
+ }
+
+ if (cpu_has(c, X86_FEATURE_TM2) && (l & (1 << 13)))
+ tm2 = 1;
+
+ if (h & APIC_VECTOR_MASK) {
+ printk(KERN_DEBUG
+ "CPU%d: Thermal LVT vector (%#x) already "
+ "installed\n", cpu, (h & APIC_VECTOR_MASK));
+ return;
+ }
+
+ h = THERMAL_APIC_VECTOR;
+ h |= (APIC_DM_FIXED | APIC_LVT_MASKED);
+ apic_write_around(APIC_LVTTHMR, h);
+
+ rdmsr(MSR_IA32_THERM_INTERRUPT, l, h);
+ wrmsr(MSR_IA32_THERM_INTERRUPT, l | 0x03, h);
+
+ 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 (%s)\n",
+ cpu, tm2 ? "TM2" : "TM1");
+ return;
+}
+
+void __init mce_intel_feature_init(struct cpuinfo_x86 *c)
+{
+ intel_init_thermal(c);
+}
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 50e9621b0273..3ebfc9117d2a 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -882,6 +882,10 @@ asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs)
{
}
+asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
+{
+}
+
/*
* 'math_state_restore()' saves the current math information in the
* old math state array, and gets the new ones from the current task
diff --git a/include/asm-x86_64/mce.h b/include/asm-x86_64/mce.h
index 1c84fa8758c3..869249db6795 100644
--- a/include/asm-x86_64/mce.h
+++ b/include/asm-x86_64/mce.h
@@ -64,4 +64,17 @@ struct mce_log {
#define MCE_GET_LOG_LEN _IOR('M', 2, int)
#define MCE_GETCLEAR_FLAGS _IOR('M', 3, int)
+/* Software defined banks */
+#define MCE_EXTENDED_BANK 128
+#define MCE_THERMAL_BANK MCE_EXTENDED_BANK + 0
+
+void mce_log(struct mce *m);
+#ifdef CONFIG_X86_MCE_INTEL
+void mce_intel_feature_init(struct cpuinfo_x86 *c);
+#else
+static inline void mce_intel_feature_init(struct cpuinfo_x86 *c)
+{
+}
+#endif
+
#endif
--
2.0.0
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/