1 files changed, 23 insertions, 4 deletions

diff --git a/arch/x86/events/msr.c b/arch/x86/events/msr.c
index 14efaa0e8684..0be15b9b2376 100644
--- a/arch/x86/events/msr.c
+++ b/arch/x86/events/msr.c
@@ -10,7 +10,9 @@ enum perf_msr_id {
 	PERF_MSR_SMI			= 4,
 	PERF_MSR_PTSC			= 5,
 	PERF_MSR_IRPERF			= 6,
-
+	PERF_MSR_THERM			= 7,
+	PERF_MSR_THERM_SNAP		= 8,
+	PERF_MSR_THERM_UNIT		= 9,
 	PERF_MSR_EVENT_MAX,
 };
 
@@ -29,6 +31,12 @@ static bool test_irperf(int idx)
 	return boot_cpu_has(X86_FEATURE_IRPERF);
 }
 
+static bool test_therm_status(int idx)
+{
+	return boot_cpu_has(X86_FEATURE_DTHERM);
+}
+
+
 static bool test_intel(int idx)
 {
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ||
@@ -102,6 +110,9 @@ PMU_EVENT_ATTR_STRING(pperf,  evattr_pperf,  "event=0x03");
 PMU_EVENT_ATTR_STRING(smi,    evattr_smi,    "event=0x04");
 PMU_EVENT_ATTR_STRING(ptsc,   evattr_ptsc,   "event=0x05");
 PMU_EVENT_ATTR_STRING(irperf, evattr_irperf, "event=0x06");
+PMU_EVENT_ATTR_STRING(cpu_thermal_margin, evattr_therm, "event=0x07");
+PMU_EVENT_ATTR_STRING(cpu_thermal_margin.snapshot, evattr_therm_snap, "1");
+PMU_EVENT_ATTR_STRING(cpu_thermal_margin.unit, evattr_therm_unit, "C");
 
 static struct perf_msr msr[] = {
 	[PERF_MSR_TSC]    = { 0,		&evattr_tsc,	NULL,		 },
@@ -111,6 +122,9 @@ static struct perf_msr msr[] = {
 	[PERF_MSR_SMI]    = { MSR_SMI_COUNT,	&evattr_smi,	test_intel,	 },
 	[PERF_MSR_PTSC]   = { MSR_F15H_PTSC,	&evattr_ptsc,	test_ptsc,	 },
 	[PERF_MSR_IRPERF] = { MSR_F17H_IRPERF,	&evattr_irperf,	test_irperf,	 },
+	[PERF_MSR_THERM] = { MSR_IA32_THERM_STATUS, &evattr_therm,	     test_therm_status, },
+	[PERF_MSR_THERM_SNAP] = { MSR_IA32_THERM_STATUS, &evattr_therm_snap, test_therm_status, },
+	[PERF_MSR_THERM_UNIT] = { MSR_IA32_THERM_STATUS, &evattr_therm_unit, test_therm_status, },
 };
 
 static struct attribute *events_attrs[PERF_MSR_EVENT_MAX + 1] = {
@@ -193,10 +207,15 @@ again:
 		goto again;
 
 	delta = now - prev;
-	if (unlikely(event->hw.event_base == MSR_SMI_COUNT))
+	if (unlikely(event->hw.event_base == MSR_SMI_COUNT)) {
 		delta = sign_extend64(delta, 31);
-
-	local64_add(delta, &event->count);
+		local64_add(delta, &event->count);
+	} else if (unlikely(event->hw.event_base == MSR_IA32_THERM_STATUS)) {
+		/* if valid, extract digital readout, other set to -1 */
+		now = now & (1ULL << 31) ? (now >> 16) & 0x3f :  -1;
+		local64_set(&event->count, now);
+	} else
+		local64_add(delta, &event->count);
 }
 
 static void msr_event_start(struct perf_event *event, int flags)