diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
index 693bdcd..4a46ef3 100644
--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -41,7 +41,7 @@
  *	MSR_CORE_C1_RES: CORE C1 Residency Counter
  *			 perf code: 0x00
  *			 Available model: SLM,AMT,GLM,CNL,ICX,TNT,ADL,RPL
- *					  MTL
+ *					  MTL,SRF
  *			 Scope: Core (each processor core has a MSR)
  *	MSR_CORE_C3_RESIDENCY: CORE C3 Residency Counter
  *			       perf code: 0x01
@@ -52,7 +52,7 @@
  *			       perf code: 0x02
  *			       Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW,
  *						SKL,KNL,GLM,CNL,KBL,CML,ICL,ICX,
- *						TGL,TNT,RKL,ADL,RPL,SPR,MTL
+ *						TGL,TNT,RKL,ADL,RPL,SPR,MTL,SRF
  *			       Scope: Core
  *	MSR_CORE_C7_RESIDENCY: CORE C7 Residency Counter
  *			       perf code: 0x03
@@ -75,7 +75,7 @@
  *			       perf code: 0x02
  *			       Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW,
  *						SKL,KNL,GLM,CNL,KBL,CML,ICL,ICX,
- *						TGL,TNT,RKL,ADL,RPL,SPR,MTL
+ *						TGL,TNT,RKL,ADL,RPL,SPR,MTL,SRF
  *			       Scope: Package (physical package)
  *	MSR_PKG_C7_RESIDENCY:  Package C7 Residency Counter.
  *			       perf code: 0x03
@@ -97,6 +97,10 @@
  *			       Available model: HSW ULT,KBL,GLM,CNL,CML,ICL,TGL,
  *						TNT,RKL,ADL,RPL,MTL
  *			       Scope: Package (physical package)
+ *	MSR_MODULE_C6_RES_MS:  Module C6 Residency Counter.
+ *			       perf code: 0x00
+ *			       Available model: SRF
+ *			       Scope: A cluster of cores shared L2 cache
  *
  */
 
@@ -130,6 +134,7 @@ static ssize_t cstate_get_attr_cpumask(struct device *dev,
 struct cstate_model {
 	unsigned long		core_events;
 	unsigned long		pkg_events;
+	unsigned long		module_events;
 	unsigned long		quirks;
 };
 
@@ -270,6 +275,28 @@ static struct perf_msr pkg_msr[] = {
 
 static cpumask_t cstate_pkg_cpu_mask;
 
+/* cstate_module PMU */
+static struct pmu cstate_module_pmu;
+static bool has_cstate_module;
+
+enum perf_cstate_module_events {
+	PERF_CSTATE_MODULE_C6_RES = 0,
+
+	PERF_CSTATE_MODULE_EVENT_MAX,
+};
+
+PMU_EVENT_ATTR_STRING(c6-residency, attr_cstate_module_c6, "event=0x00");
+
+static unsigned long module_msr_mask;
+
+PMU_EVENT_GROUP(events, cstate_module_c6);
+
+static struct perf_msr module_msr[] = {
+	[PERF_CSTATE_MODULE_C6_RES]  = { MSR_MODULE_C6_RES_MS,	&group_cstate_module_c6,	test_msr },
+};
+
+static cpumask_t cstate_module_cpu_mask;
+
 static ssize_t cstate_get_attr_cpumask(struct device *dev,
 				       struct device_attribute *attr,
 				       char *buf)
@@ -280,6 +307,8 @@ static ssize_t cstate_get_attr_cpumask(struct device *dev,
 		return cpumap_print_to_pagebuf(true, buf, &cstate_core_cpu_mask);
 	else if (pmu == &cstate_pkg_pmu)
 		return cpumap_print_to_pagebuf(true, buf, &cstate_pkg_cpu_mask);
+	else if (pmu == &cstate_module_pmu)
+		return cpumap_print_to_pagebuf(true, buf, &cstate_module_cpu_mask);
 	else
 		return 0;
 }
@@ -320,6 +349,15 @@ static int cstate_pmu_event_init(struct perf_event *event)
 		event->hw.event_base = pkg_msr[cfg].msr;
 		cpu = cpumask_any_and(&cstate_pkg_cpu_mask,
 				      topology_die_cpumask(event->cpu));
+	} else if (event->pmu == &cstate_module_pmu) {
+		if (cfg >= PERF_CSTATE_MODULE_EVENT_MAX)
+			return -EINVAL;
+		cfg = array_index_nospec((unsigned long)cfg, PERF_CSTATE_MODULE_EVENT_MAX);
+		if (!(module_msr_mask & (1 << cfg)))
+			return -EINVAL;
+		event->hw.event_base = module_msr[cfg].msr;
+		cpu = cpumask_any_and(&cstate_module_cpu_mask,
+				      topology_cluster_cpumask(event->cpu));
 	} else {
 		return -ENOENT;
 	}
@@ -407,6 +445,17 @@ static int cstate_cpu_exit(unsigned int cpu)
 			perf_pmu_migrate_context(&cstate_pkg_pmu, cpu, target);
 		}
 	}
+
+	if (has_cstate_module &&
+	    cpumask_test_and_clear_cpu(cpu, &cstate_module_cpu_mask)) {
+
+		target = cpumask_any_but(topology_cluster_cpumask(cpu), cpu);
+		/* Migrate events if there is a valid target */
+		if (target < nr_cpu_ids) {
+			cpumask_set_cpu(target, &cstate_module_cpu_mask);
+			perf_pmu_migrate_context(&cstate_module_pmu, cpu, target);
+		}
+	}
 	return 0;
 }
 
@@ -433,6 +482,15 @@ static int cstate_cpu_init(unsigned int cpu)
 	if (has_cstate_pkg && target >= nr_cpu_ids)
 		cpumask_set_cpu(cpu, &cstate_pkg_cpu_mask);
 
+	/*
+	 * If this is the first online thread of that cluster, set it
+	 * in the cluster cpu mask as the designated reader.
+	 */
+	target = cpumask_any_and(&cstate_module_cpu_mask,
+				 topology_cluster_cpumask(cpu));
+	if (has_cstate_module && target >= nr_cpu_ids)
+		cpumask_set_cpu(cpu, &cstate_module_cpu_mask);
+
 	return 0;
 }
 
@@ -455,6 +513,11 @@ static const struct attribute_group *pkg_attr_update[] = {
 	NULL,
 };
 
+static const struct attribute_group *module_attr_update[] = {
+	&group_cstate_module_c6,
+	NULL
+};
+
 static struct pmu cstate_core_pmu = {
 	.attr_groups	= cstate_attr_groups,
 	.attr_update	= core_attr_update,
@@ -485,6 +548,21 @@ static struct pmu cstate_pkg_pmu = {
 	.module		= THIS_MODULE,
 };
 
+static struct pmu cstate_module_pmu = {
+	.attr_groups	= cstate_attr_groups,
+	.attr_update	= module_attr_update,
+	.name		= "cstate_module",
+	.task_ctx_nr	= perf_invalid_context,
+	.event_init	= cstate_pmu_event_init,
+	.add		= cstate_pmu_event_add,
+	.del		= cstate_pmu_event_del,
+	.start		= cstate_pmu_event_start,
+	.stop		= cstate_pmu_event_stop,
+	.read		= cstate_pmu_event_update,
+	.capabilities	= PERF_PMU_CAP_NO_INTERRUPT | PERF_PMU_CAP_NO_EXCLUDE,
+	.module		= THIS_MODULE,
+};
+
 static const struct cstate_model nhm_cstates __initconst = {
 	.core_events		= BIT(PERF_CSTATE_CORE_C3_RES) |
 				  BIT(PERF_CSTATE_CORE_C6_RES),
@@ -599,6 +677,15 @@ static const struct cstate_model glm_cstates __initconst = {
 				  BIT(PERF_CSTATE_PKG_C10_RES),
 };
 
+static const struct cstate_model srf_cstates __initconst = {
+	.core_events		= BIT(PERF_CSTATE_CORE_C1_RES) |
+				  BIT(PERF_CSTATE_CORE_C6_RES),
+
+	.pkg_events		= BIT(PERF_CSTATE_PKG_C6_RES),
+
+	.module_events		= BIT(PERF_CSTATE_MODULE_C6_RES),
+};
+
 
 static const struct x86_cpu_id intel_cstates_match[] __initconst = {
 	X86_MATCH_INTEL_FAM6_MODEL(NEHALEM,		&nhm_cstates),
@@ -651,6 +738,7 @@ static const struct x86_cpu_id intel_cstates_match[] __initconst = {
 	X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT,	&glm_cstates),
 	X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT_L,	&glm_cstates),
 	X86_MATCH_INTEL_FAM6_MODEL(ATOM_GRACEMONT,	&adl_cstates),
+	X86_MATCH_INTEL_FAM6_MODEL(ATOM_CRESTMONT_X,	&srf_cstates),
 
 	X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_L,		&icl_cstates),
 	X86_MATCH_INTEL_FAM6_MODEL(ICELAKE,		&icl_cstates),
@@ -692,10 +780,14 @@ static int __init cstate_probe(const struct cstate_model *cm)
 	pkg_msr_mask = perf_msr_probe(pkg_msr, PERF_CSTATE_PKG_EVENT_MAX,
 				      true, (void *) &cm->pkg_events);
 
+	module_msr_mask = perf_msr_probe(module_msr, PERF_CSTATE_MODULE_EVENT_MAX,
+				      true, (void *) &cm->module_events);
+
 	has_cstate_core = !!core_msr_mask;
 	has_cstate_pkg  = !!pkg_msr_mask;
+	has_cstate_module  = !!module_msr_mask;
 
-	return (has_cstate_core || has_cstate_pkg) ? 0 : -ENODEV;
+	return (has_cstate_core || has_cstate_pkg || has_cstate_module) ? 0 : -ENODEV;
 }
 
 static inline void cstate_cleanup(void)
@@ -708,6 +800,9 @@ static inline void cstate_cleanup(void)
 
 	if (has_cstate_pkg)
 		perf_pmu_unregister(&cstate_pkg_pmu);
+
+	if (has_cstate_module)
+		perf_pmu_unregister(&cstate_module_pmu);
 }
 
 static int __init cstate_init(void)
@@ -744,6 +839,16 @@ static int __init cstate_init(void)
 			return err;
 		}
 	}
+
+	if (has_cstate_module) {
+		err = perf_pmu_register(&cstate_module_pmu, cstate_module_pmu.name, -1);
+		if (err) {
+			has_cstate_module = false;
+			pr_info("Failed to register cstate cluster pmu\n");
+			cstate_cleanup();
+			return err;
+		}
+	}
 	return 0;
 }
 
