diff options
| author | Besar Wicaksono <bwicaksono@nvidia.com> | 2026-03-24 04:29:47 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2026-03-24 15:37:32 +0300 |
| commit | bc86281fe4bd5d4a78be2f370e8319c9517e40ff (patch) | |
| tree | f497d8b231c602998e89bf4481824599b9f5d122 | |
| parent | f5caf26fd6c71294d0fb254404ed66f8cff6f7f7 (diff) | |
| download | linux-bc86281fe4bd5d4a78be2f370e8319c9517e40ff.tar.xz | |
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: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Signed-off-by: Besar Wicaksono <bwicaksono@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>
| -rw-r--r-- | drivers/perf/arm_cspmu/arm_cspmu.c | 19 | ||||
| -rw-r--r-- | 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/arm_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 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) { diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h b/drivers/perf/arm_cspmu/arm_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 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__ */ |