@@ -223,6 +223,9 @@ void intel_init_thermal(struct cpuinfo_x86 *c);
void mce_log_therm_throt_event(__u64 status);
+/* Interrupt Handler for core thermal thresholds */
+extern int (*platform_thermal_notify)(__u64 msr_val);
+
#ifdef CONFIG_X86_THERMAL_VECTOR
extern void mcheck_intel_therm_init(void);
#else
@@ -34,6 +34,11 @@
/* How long to wait between reporting thermal events */
#define CHECK_INTERVAL (300 * HZ)
+/* Similar to CHECK_INTERVAL. But interval is reduced because
+ * these lower and upper threhsolds will be crossed frequently.
+ * Hence the reporting should be quick enough to handle the event */
+#define THRES_INTERVAL (25 * HZ)
+
#define THERMAL_THROTTLING_EVENT 0
#define POWER_LIMIT_EVENT 1
@@ -53,8 +58,13 @@ struct thermal_state {
struct _thermal_state core_power_limit;
struct _thermal_state package_throttle;
struct _thermal_state package_power_limit;
+ struct _thermal_state core_thresh0;
+ struct _thermal_state core_thresh1;
};
+/* Callback to handle core threshold interrupts */
+int (*platform_thermal_notify)(__u64 msr_val);
+
static DEFINE_PER_CPU(struct thermal_state, thermal_state);
static atomic_t therm_throt_en = ATOMIC_INIT(0);
@@ -200,6 +210,32 @@ static int therm_throt_process(bool new_event, int event, int level)
return 0;
}
+static int thresh_event_valid(int event)
+{
+ struct _thermal_state *state = NULL;
+
+ unsigned int this_cpu = smp_processor_id();
+ struct thermal_state *pstate = &per_cpu(thermal_state, this_cpu);
+ u64 now = get_jiffies_64();
+
+ switch (event) {
+ case 0:
+ state = &pstate->core_thresh0;
+ break;
+ case 1:
+ state = &pstate->core_thresh1;
+ break;
+ default:
+ WARN_ON(1);
+ }
+
+ if (time_before64(now, state->next_check))
+ return 0;
+
+ state->next_check = now + THRES_INTERVAL;
+ return 1;
+}
+
#ifdef CONFIG_SYSFS
/* Add/Remove thermal_throttle interface for CPU device: */
static __cpuinit int thermal_throttle_add_dev(struct sys_device *sys_dev,
@@ -313,6 +349,22 @@ device_initcall(thermal_throttle_init_device);
#define PACKAGE_THROTTLED ((__u64)2 << 62)
#define PACKAGE_POWER_LIMIT ((__u64)3 << 62)
+static void notify_thresholds(__u64 msr_val)
+{
+ /* check whether the interrupt handler is defined;
+ * otherwise simply return
+ */
+ if (!platform_thermal_notify)
+ return;
+
+ /* lower threshold reached */
+ if ((msr_val & THERM_LOG_THRESHOLD0) && thresh_event_valid(0))
+ platform_thermal_notify(msr_val);
+ /* higher threshold reached */
+ if ((msr_val & THERM_LOG_THRESHOLD1) && thresh_event_valid(1))
+ platform_thermal_notify(msr_val);
+}
+
/* Thermal transition interrupt handler */
static void intel_thermal_interrupt(void)
{
@@ -321,6 +373,10 @@ static void intel_thermal_interrupt(void)
rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
+ /* Check for violation of core thermal thresholds
+ * If so, send notification */
+ notify_thresholds(msr_val);
+
if (therm_throt_process(msr_val & THERM_STATUS_PROCHOT,
THERMAL_THROTTLING_EVENT,
CORE_LEVEL) != 0)
@@ -36,9 +36,17 @@
#include <asm/msr.h>
#include <asm/processor.h>
#include <asm/smp.h>
+#include <asm/mce.h>
+#include <linux/thermal.h>
#define DRVNAME "coretemp"
+/* An identification number to the DTS sensor.
+ * This will help the user space to figure out which
+ * sensor caused the event
+ */
+#define DTS_ID 0
+
typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL,
SHOW_NAME } SHOW;
@@ -69,6 +77,45 @@ struct coretemp_data {
static int set_core_threshold(struct coretemp_data *data, int val,
enum thresholds thresh);
+/* Interrupt Handlers for core/package thresholds */
+struct work_struct *t0_netlink_handlr;
+struct work_struct *t1_netlink_handlr;
+
+/* Send netlink event for DTS sensor reaching threshold0 */
+static void gen_netlink_t0(struct work_struct *work)
+{
+ generate_netlink_event(DTS_ID, THERMAL_AUX0);
+}
+
+/* Send netlink event for DTS sensor reaching threshold1 */
+static void gen_netlink_t1(struct work_struct *work)
+{
+ generate_netlink_event(DTS_ID, THERMAL_AUX1);
+}
+
+/* Platform thermal Interrupt Handler */
+static int coretemp_interrupt(__u64 msr_val)
+{
+
+ if (msr_val & THERM_LOG_THRESHOLD0) {
+ if (!(msr_val & THERM_STATUS_THRESHOLD0))
+ schedule_work(t0_netlink_handlr);
+
+ /* Reset the Threshold0 interrupt */
+ wrmsrl(MSR_IA32_THERM_STATUS, msr_val & ~THERM_LOG_THRESHOLD0);
+ }
+
+ if (msr_val & THERM_LOG_THRESHOLD1) {
+ if (msr_val & THERM_STATUS_THRESHOLD1)
+ schedule_work(t1_netlink_handlr);
+
+ /* Reset the Threshold1 interrupt */
+ wrmsrl(MSR_IA32_THERM_STATUS, msr_val & ~THERM_LOG_THRESHOLD1);
+ }
+
+ return 0;
+}
+
/*
* Sysfs stuff
*/
@@ -415,6 +462,9 @@ static int __devinit enable_thresh_support(struct coretemp_data *data)
flag = 0; /*Flag should be zero to unmask the apic */
smp_call_function_single(data->id, &configure_apic, &flag, 1);
+ /* Enable the Interrupt Handling Support */
+ platform_thermal_notify = coretemp_interrupt;
+
return 0;
}
@@ -702,6 +752,20 @@ static int __init coretemp_init(void)
#endif
register_hotcpu_notifier(&coretemp_cpu_notifier);
+
+ /* Initialize the Interrupt Handlers */
+ t0_netlink_handlr = kzalloc(sizeof(struct work_struct), GFP_KERNEL);
+ if (!t0_netlink_handlr)
+ return -ENOMEM;
+
+ t1_netlink_handlr = kzalloc(sizeof(struct work_struct), GFP_KERNEL);
+ if (!t1_netlink_handlr) {
+ kfree(t0_netlink_handlr);
+ return -ENOMEM;
+ }
+ INIT_WORK(t0_netlink_handlr, (void *)gen_netlink_t0);
+ INIT_WORK(t1_netlink_handlr, (void *)gen_netlink_t1);
+
return 0;
#ifndef CONFIG_HOTPLUG_CPU