[PATCH] x86: Refactor thermal throttle processing

Refactor the event processing (syslog messaging and rate limiting)
into separate file therm_throt.c. This allows consistent reporting
of CPU thermal throttle events.

After ACK'ing the interrupt, if the event is current, the user
(p4.c/mce_intel.c) calls therm_throt_process to log (and rate limit)
the event. If that function returns 1, the user has the option to log
things further (such as to mce_log in x86_64).

AK: minor cleanup

Signed-off-by: Dmitriy Zavin <dmitriyz@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>

6 files changed, 100 insertions, 41 deletions

diff --git a/arch/i386/kernel/cpu/mcheck/Makefile b/arch/i386/kernel/cpu/mcheck/Makefile
index 30808f3d6715..f1ebe1c1c17a 100644
--- a/arch/i386/kernel/cpu/mcheck/Makefile
+++ b/arch/i386/kernel/cpu/mcheck/Makefile
@@ -1,2 +1,2 @@
-obj-y   =       mce.o k7.o p4.o p5.o p6.o winchip.o
+obj-y   =       mce.o k7.o p4.o p5.o p6.o winchip.o therm_throt.o
 obj-$(CONFIG_X86_MCE_NONFATAL)  +=      non-fatal.o
diff --git a/arch/i386/kernel/cpu/mcheck/p4.c b/arch/i386/kernel/cpu/mcheck/p4.c
index b95f1b3d53aa..d83a669d376f 100644
--- a/arch/i386/kernel/cpu/mcheck/p4.c
+++ b/arch/i386/kernel/cpu/mcheck/p4.c
@@ -13,6 +13,8 @@
 #include <asm/msr.h>
 #include <asm/apic.h>
 
+#include <asm/therm_throt.h>
+
 #include "mce.h"
 
 /* as supported by the P4/Xeon family */
@@ -44,25 +46,12 @@ static void unexpected_thermal_interrupt(struct pt_regs *regs)
 /* 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];
+        __u64 msr_val;
 
         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);
-        }
+        rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
+        therm_throt_process(msr_val & 0x1);
 }
 
 /* Thermal interrupt handler for this CPU setup */
@@ -122,7 +111,7 @@ static void intel_init_thermal(struct cpuinfo_x86 *c)
         
         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);
diff --git a/arch/i386/kernel/cpu/mcheck/therm_throt.c b/arch/i386/kernel/cpu/mcheck/therm_throt.c
new file mode 100644
index 000000000000..85eba00d680e
--- /dev/null
+++ b/arch/i386/kernel/cpu/mcheck/therm_throt.c
@@ -0,0 +1,58 @@
+/*
+ * linux/arch/i386/kerne/cpu/mcheck/therm_throt.c
+ *
+ * Thermal throttle event support code.
+ *
+ * Author: Dmitriy Zavin (dmitriyz@google.com)
+ *
+ * Credits: Adapted from Zwane Mwaikambo's original code in mce_intel.c.
+ *
+ */
+
+#include <linux/percpu.h>
+#include <linux/cpu.h>
+#include <asm/cpu.h>
+#include <linux/notifier.h>
+#include <asm/therm_throt.h>
+
+/* How long to wait between reporting thermal events */
+#define CHECK_INTERVAL              (300 * HZ)
+
+static DEFINE_PER_CPU(unsigned long, next_check);
+
+/***
+ * therm_throt_process - Process thermal throttling event
+ * @curr: Whether the condition is current or not (boolean), since the
+ *        thermal interrupt normally gets called both when the thermal
+ *        event begins and once the event has ended.
+ *
+ * This function is normally called by the thermal interrupt after the
+ * IRQ has been acknowledged.
+ *
+ * It will take care of rate limiting and printing messages to the syslog.
+ *
+ * Returns: 0 : Event should NOT be further logged, i.e. still in
+ *              "timeout" from previous log message.
+ *          1 : Event should be logged further, and a message has been
+ *              printed to the syslog.
+ */
+int therm_throt_process(int curr)
+{
+        unsigned int cpu = smp_processor_id();
+
+        if (time_before(jiffies, __get_cpu_var(next_check)))
+                return 0;
+
+        __get_cpu_var(next_check) = jiffies + CHECK_INTERVAL;
+
+        /* if we just entered the thermal event */
+        if (curr) {
+                printk(KERN_CRIT "CPU%d: Temperature above threshold, "
+                       "cpu clock throttled\n", cpu);
+                add_taint(TAINT_MACHINE_CHECK);
+        } else {
+                printk(KERN_CRIT "CPU%d: Temperature/speed normal\n", cpu);
+        }
+
+        return 1;
+}
diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile
index 2466fbd035ee..3c7cbff04d3d 100644
--- a/arch/x86_64/kernel/Makefile
+++ b/arch/x86_64/kernel/Makefile
@@ -11,7 +11,7 @@ obj-y	:= process.o signal.o entry.o traps.o irq.o \
                 pci-dma.o pci-nommu.o alternative.o
 
 obj-$(CONFIG_STACKTRACE)        += stacktrace.o
-obj-$(CONFIG_X86_MCE)         += mce.o
+obj-$(CONFIG_X86_MCE)           += mce.o therm_throt.o
 obj-$(CONFIG_X86_MCE_INTEL)     += mce_intel.o
 obj-$(CONFIG_X86_MCE_AMD)       += mce_amd.o
 obj-$(CONFIG_MTRR)              += ../../i386/kernel/cpu/mtrr/
@@ -46,6 +46,7 @@ obj-y				+= intel_cacheinfo.o
 
 CFLAGS_vsyscall.o               := $(PROFILING) -g0
 
+therm_throt-y                   += ../../i386/kernel/cpu/mcheck/therm_throt.o
 bootflag-y                      += ../../i386/kernel/bootflag.o
 cpuid-$(subst m,y,$(CONFIG_X86_CPUID))  += ../../i386/kernel/cpuid.o
 topology-y                     += ../../i386/kernel/topology.o
@@ -55,4 +56,3 @@ quirks-y			+= ../../i386/kernel/quirks.o
 i8237-y                         += ../../i386/kernel/i8237.o
 msr-$(subst m,y,$(CONFIG_X86_MSR))  += ../../i386/kernel/msr.o
 alternative-y                   += ../../i386/kernel/alternative.o
-
diff --git a/arch/x86_64/kernel/mce.c b/arch/x86_64/kernel/mce.c
index 1a93c3738404..bbea88801d88 100644
--- a/arch/x86_64/kernel/mce.c
+++ b/arch/x86_64/kernel/mce.c
@@ -274,6 +274,33 @@ void do_machine_check(struct pt_regs * regs, long error_code)
         atomic_dec(&mce_entry);
 }
 
+#ifdef CONFIG_X86_MCE_INTEL
+/***
+ * mce_log_therm_throt_event - Logs the thermal throttling event to mcelog
+ * @cpu: The CPU on which the event occured.
+ * @status: Event status information
+ *
+ * This function should be called by the thermal interrupt after the
+ * event has been processed and the decision was made to log the event
+ * further.
+ *
+ * The status parameter will be saved to the 'status' field of 'struct mce'
+ * and historically has been the register value of the
+ * MSR_IA32_THERMAL_STATUS (Intel) msr.
+ */
+void mce_log_therm_throt_event(unsigned int cpu, __u64 status)
+{
+        struct mce m;
+
+        memset(&m, 0, sizeof(m));
+        m.cpu = cpu;
+        m.bank = MCE_THERMAL_BANK;
+        m.status = status;
+        rdtscll(m.tsc);
+        mce_log(&m);
+}
+#endif /* CONFIG_X86_MCE_INTEL */
+
 /*
  * Periodic polling timer for "silent" machine check errors.
  */
diff --git a/arch/x86_64/kernel/mce_intel.c b/arch/x86_64/kernel/mce_intel.c
index 8f533d2c40cb..dec11219e278 100644
--- a/arch/x86_64/kernel/mce_intel.c
+++ b/arch/x86_64/kernel/mce_intel.c
@@ -11,36 +11,21 @@
 #include <asm/mce.h>
 #include <asm/hw_irq.h>
 #include <asm/idle.h>
-
-static DEFINE_PER_CPU(unsigned long, next_check);
+#include <asm/therm_throt.h>
 
 asmlinkage void smp_thermal_interrupt(void)
 {
-        struct mce m;
+        __u64 msr_val;
 
         ack_APIC_irq();
 
         exit_idle();
         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:
+        rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
+        if (therm_throt_process(msr_val & 1))
+                mce_log_therm_throt_event(smp_processor_id(), msr_val);
+
         irq_exit();
 }