diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index 47b1f2ea657a..df26ae74aff4 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -1118,3 +1118,72 @@ int find_acpi_cache_level_from_id(u32 cache_id)
 	acpi_put_table(table);
 	return -ENOENT;
 }
+
+/**
+ * acpi_pptt_get_cpumask_from_cache_id() - Get the cpus associated with the
+ * 					   specified cache
+ * @cache_id: The id field of the unified cache
+ * @cpus: Where to buidl the cpumask
+ *
+ * Determine which CPUs are below this cache in the PPTT. This allows the property
+ * to be found even if the CPUs are offline.
+ *
+ * The PPTT table must be rev 3 or later,
+ *
+ * Return: -ENOENT if the PPTT doesn't exist, or the cache cannot be found.
+ * Otherwise returns 0 and sets the cpus in the provided cpumask.
+ */
+int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus)
+{
+	u32 acpi_cpu_id;
+	acpi_status status;
+	int level, cpu, num_levels;
+	struct acpi_pptt_cache *cache;
+	struct acpi_table_header *table;
+	struct acpi_pptt_cache_v1* cache_v1;
+	struct acpi_pptt_processor *cpu_node;
+
+	cpumask_clear(cpus);
+
+	status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
+	if (ACPI_FAILURE(status)) {
+		acpi_pptt_warn_missing();
+		return -ENOENT;
+	}
+
+	if (table->revision < 3) {
+		acpi_put_table(table);
+		return -ENOENT;
+	}
+
+	/*
+	 * If we found the cache first, we'd still need to walk from each cpu.
+	 */
+	for_each_possible_cpu(cpu) {
+		acpi_cpu_id = get_acpi_id_for_cpu(cpu);
+		cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
+		if (!cpu_node)
+			break;
+		num_levels = acpi_count_levels(table, cpu_node);
+
+		for (level = 0; level <= num_levels; level++) {
+			cache = acpi_find_cache_node(table, acpi_cpu_id,
+						     ACPI_PPTT_CACHE_TYPE_UNIFIED,
+						     level, &cpu_node);
+			if (!cache)
+				continue;
+
+			cache_v1 = ACPI_ADD_PTR(struct acpi_pptt_cache_v1,
+						cache,
+						sizeof(struct acpi_pptt_cache));
+
+			if (cache->flags & ACPI_PPTT_CACHE_ID_VALID &&
+			    cache_v1->cache_id == cache_id) {
+				cpumask_set_cpu(cpu, cpus);
+			}
+		}
+	}
+
+	acpi_put_table(table);
+	return 0;
+}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 5fedde2a024a..c84577a461ab 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1367,6 +1367,7 @@ u32 acpi_pptt_count_containers(void);
 int acpi_pptt_for_each_container(acpi_pptt_cpu_callback_t callback, void *arg);
 void acpi_pptt_get_child_cpus(struct acpi_pptt_processor *parent_node, cpumask_t *cpus);
 int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus);
+int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus);
 #else
 static inline int acpi_pptt_cpu_is_thread(unsigned int cpu)
 {
@@ -1411,6 +1412,11 @@ static inline int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id,
 {
 	return -EINVAL;
 }
+static inline int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id,
+						      cpumask_t *cpus)
+{
+	return -EINVAL;
+}
 #endif
 
 #ifdef CONFIG_ACPI