Commit bc86281f authored by Besar Wicaksono's avatar Besar Wicaksono Committed by Will Deacon
Browse files

perf/arm_cspmu: Add arm_cspmu_acpi_dev_get 



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: default avatarIlkka Koskinen <ilkka@os.amperecomputing.com>
Signed-off-by: default avatarBesar Wicaksono <bwicaksono@nvidia.com>
Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent f5caf26f

drivers/perf/arm_cspmu/arm_cspmu.c

+18 −1
Original line number Diff line number Diff line
@@ -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)

{

drivers/perf/arm_cspmu/arm_cspmu.h

+16 −1
Original line number Diff line number Diff line 
/* 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__ */