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charset="utf-8" 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 Signed-off-by: Besar Wicaksono --- drivers/perf/arm_cspmu/arm_cspmu.c | 19 ++++++++++++++++++- drivers/perf/arm_cspmu/arm_cspmu.h | 17 ++++++++++++++++- 2 files changed, 34 insertions(+), 2 deletions(-) diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/ar= m_cspmu.c index 34430b68f602..49e8a1f38131 100644 --- a/drivers/perf/arm_cspmu/arm_cspmu.c +++ b/drivers/perf/arm_cspmu/arm_cspmu.c @@ -16,7 +16,7 @@ * The user should refer to the vendor technical documentation to get deta= ils * about the supported events. * - * Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights re= served. + * Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights re= served. * */ =20 @@ -1132,6 +1132,23 @@ static int arm_cspmu_acpi_get_cpus(struct arm_cspmu = *cspmu) =20 return 0; } + +struct acpi_device *arm_cspmu_acpi_dev_get(const struct arm_cspmu *cspmu) +{ + char hid[16] =3D {}; + char uid[16] =3D {}; + const struct acpi_apmt_node *apmt_node; + + apmt_node =3D arm_cspmu_apmt_node(cspmu->dev); + if (!apmt_node || apmt_node->type !=3D 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) { diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h b/drivers/perf/arm_cspmu/ar= m_cspmu.h index cd65a58dbd88..3fc5c8d77266 100644 --- a/drivers/perf/arm_cspmu/arm_cspmu.h +++ b/drivers/perf/arm_cspmu/arm_cspmu.h @@ -1,13 +1,14 @@ /* SPDX-License-Identifier: GPL-2.0 * * ARM CoreSight Architecture PMU driver. - * Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights re= served. + * Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights re= served. * */ =20 #ifndef __ARM_CSPMU_H__ #define __ARM_CSPMU_H__ =20 +#include #include #include #include @@ -255,4 +256,18 @@ int arm_cspmu_impl_register(const struct arm_cspmu_imp= l_match *impl_match); /* Unregister vendor backend. */ void arm_cspmu_impl_unregister(const struct arm_cspmu_impl_match *impl_mat= ch); =20 +#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 de= vice. + */ +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__ */ --=20 2.43.0