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perf/arm_cspmu: Add arm_cspmu_acpi_dev_get

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Add interface to get ACPI device associated with the
PMU. This ACPI device may contain additional properties
not covered by the standard properties.

Reviewed-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Signed-off-by: Besar Wicaksono <bwicaksono@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Besar Wicaksono 2026-03-24 01:29:47 +00:00 committed by Will Deacon
parent f5caf26fd6
commit bc86281fe4
2 changed files with 34 additions and 2 deletions
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19
drivers/perf/arm_cspmu/arm_cspmu.c
View File

@ -16,7 +16,7 @@
* The user should refer to the vendor technical documentation to get details
* about the supported events.
*
* Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
*
*/
@ -1132,6 +1132,23 @@ 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] = {};
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;
memcpy(hid, &apmt_node->inst_primary, sizeof(apmt_node->inst_primary));
snprintf(uid, sizeof(uid), "%u", apmt_node->inst_secondary);
return acpi_dev_get_first_match_dev(hid, uid, -1);
}
EXPORT_SYMBOL_GPL(arm_cspmu_acpi_dev_get);
#else
static int arm_cspmu_acpi_get_cpus(struct arm_cspmu *cspmu)
{

17
drivers/perf/arm_cspmu/arm_cspmu.h
View File

@ -1,13 +1,14 @@
/* SPDX-License-Identifier: GPL-2.0
*
* ARM CoreSight Architecture PMU driver.
* Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
*
*/
#ifndef __ARM_CSPMU_H__
#define __ARM_CSPMU_H__
#include <linux/acpi.h>
#include <linux/bitfield.h>
#include <linux/cpumask.h>
#include <linux/device.h>
@ -255,4 +256,18 @@ 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) && defined(CONFIG_ARM64)
/**
* 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__ */