Add interface to get ACPI device associated with the
PMU. This ACPI device may contain additional properties
not covered by the standard properties.
Signed-off-by: Besar Wicaksono <bwicaksono@nvidia.com>
---
drivers/perf/arm_cspmu/arm_cspmu.c | 22 ++++++++++++++++++++++
drivers/perf/arm_cspmu/arm_cspmu.h | 15 +++++++++++++++
2 files changed, 37 insertions(+)
diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
index efa9b229e701..75b2d80f783e 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.c
+++ b/drivers/perf/arm_cspmu/arm_cspmu.c
@@ -1090,6 +1090,28 @@ static int arm_cspmu_acpi_get_cpus(struct arm_cspmu *cspmu)
return 0;
}
+
+struct acpi_device *arm_cspmu_acpi_dev_get(const struct arm_cspmu *cspmu)
+{
+ char hid[16];
+ char uid[16];
+ struct acpi_device *adev;
+ const struct acpi_apmt_node *apmt_node;
+
+ apmt_node = arm_cspmu_apmt_node(cspmu->dev);
+ if (!apmt_node || apmt_node->type != ACPI_APMT_NODE_TYPE_ACPI)
+ return NULL;
+
+ memset(hid, 0, sizeof(hid));
+ memset(uid, 0, sizeof(uid));
+
+ memcpy(hid, &apmt_node->inst_primary, sizeof(apmt_node->inst_primary));
+ sprintf(uid, "%u", apmt_node->inst_secondary);
+
+ adev = acpi_dev_get_first_match_dev(hid, uid, -1);
+ return adev;
+}
+EXPORT_SYMBOL_GPL(arm_cspmu_acpi_dev_get);
#else
static int arm_cspmu_acpi_get_cpus(struct arm_cspmu *cspmu)
{
diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h b/drivers/perf/arm_cspmu/arm_cspmu.h
index 19684b76bd96..bba513224586 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.h
+++ b/drivers/perf/arm_cspmu/arm_cspmu.h
@@ -8,6 +8,7 @@
#ifndef __ARM_CSPMU_H__
#define __ARM_CSPMU_H__
+#include <linux/acpi.h>
#include <linux/bitfield.h>
#include <linux/cpumask.h>
#include <linux/device.h>
@@ -222,4 +223,18 @@ int arm_cspmu_impl_register(const struct arm_cspmu_impl_match *impl_match);
/* Unregister vendor backend. */
void arm_cspmu_impl_unregister(const struct arm_cspmu_impl_match *impl_match);
+#if defined(CONFIG_ACPI)
+/**
+ * Get ACPI device associated with the PMU.
+ * The caller is responsible for calling acpi_dev_put() on the returned device.
+ */
+struct acpi_device *arm_cspmu_acpi_dev_get(const struct arm_cspmu *cspmu);
+#else
+static inline struct acpi_device *
+arm_cspmu_acpi_dev_get(const struct arm_cspmu *cspmu)
+{
+ return NULL;
+}
+#endif
+
#endif /* __ARM_CSPMU_H__ */
--
2.50.1