perf: add NVIDIA Tegra410 Uncore PMU support [LWN.net]

From:		Besar Wicaksono <bwicaksono-AT-nvidia.com>
To:		<will-AT-kernel.org>, <suzuki.poulose-AT-arm.com>, <robin.murphy-AT-arm.com>, <ilkka-AT-os.amperecomputing.com>, <jonathan.cameron-AT-huawei.com>
Subject:		[PATCH v3 0/8] perf: add NVIDIA Tegra410 Uncore PMU support
Date:		Tue, 24 Mar 2026 01:29:44 +0000
Message-ID:		<20260324012952.1923296-1-bwicaksono@nvidia.com>
Cc:		<linux-arm-kernel-AT-lists.infradead.org>, <linux-kernel-AT-vger.kernel.org>, <linux-tegra-AT-vger.kernel.org>, <mark.rutland-AT-arm.com>, <treding-AT-nvidia.com>, <jonathanh-AT-nvidia.com>, <vsethi-AT-nvidia.com>, <rwiley-AT-nvidia.com>, <sdonthineni-AT-nvidia.com>, <skelley-AT-nvidia.com>, <mochs-AT-nvidia.com>, <nirmoyd-AT-nvidia.com>, <bhelgaas-AT-google.com>, <wangyushan12-AT-huawei.com>, <shiju.jose-AT-huawei.com>, <linux-pci-AT-vger.kernel.org>, Besar Wicaksono <bwicaksono-AT-nvidia.com>
Archive-link:		Article

This series adds driver support for the following Uncore PMUs in
NVIDIA Tegra410 SoC:
  - Unified Coherence Fabric (UCF)
  - PCIE
  - PCIE-TGT
  - CPU Memory (CMEM) Latency
  - NVLink-C2C
  - NV-CLink
  - NV-DLink

Changes from v2:
  * Addressed comment on arm_cspmu_acpi_dev_get buffer initialization and matching
    CONFIG_* guard.
  * Addressed comment on nvidia_cspmu attribute table and match-entry style,
    validation scoping, and ACPI+ARM64 around instance-id lookup.
  * Addressed comment on PCIe documentation (fabric placement and cycles event).
  * Rework CMEM latency PMU (separate broadcast MMIO, CMEM_LAT_* macro
    names, event_init and formatting).
  * Rework C2C PMU sysfs using static attribute groups and nv_c2c_pmu_data in
    ACPI match data; drop dynamic group allocation, is_visible, and ACPI_PTR.
v2: https://lore.kernel.org/all/20260218145809.1622856-1-bwic...

Changes from v1:
  * Add more clarity on the commit message.
  * Fix build error reported by kernel test robot on PATCH 6/8.
    * It was missing ACPI dependency on Kconfig for the CPU Memory
      Latency PMU.
  * Apply code formatting suggestions from Ilkka.
  * Added Reviewed-by from Ilkka.
v1: https://lore.kernel.org/all/20260126181155.2776097-1-bwic...

Thanks to Ilkka, Krzysztof, Jon, and Jonathan Cameron for the comments.

Thanks,
Besar

Besar Wicaksono (8):
  perf/arm_cspmu: nvidia: Rename doc to Tegra241
  perf/arm_cspmu: nvidia: Add Tegra410 UCF PMU
  perf/arm_cspmu: Add arm_cspmu_acpi_dev_get
  perf/arm_cspmu: nvidia: Add Tegra410 PCIE PMU
  perf/arm_cspmu: nvidia: Add Tegra410 PCIE-TGT PMU
  perf: add NVIDIA Tegra410 CPU Memory Latency PMU
  perf: add NVIDIA Tegra410 C2C PMU
  arm64: defconfig: Enable NVIDIA TEGRA410 PMU

 Documentation/admin-guide/perf/index.rst      |    3 +-
 ...nvidia-pmu.rst => nvidia-tegra241-pmu.rst} |    8 +-
 .../admin-guide/perf/nvidia-tegra410-pmu.rst  |  522 ++++++++
 arch/arm64/configs/defconfig                  |    2 +
 drivers/perf/Kconfig                          |   14 +
 drivers/perf/Makefile                         |    2 +
 drivers/perf/arm_cspmu/arm_cspmu.c            |   19 +-
 drivers/perf/arm_cspmu/arm_cspmu.h            |   17 +-
 drivers/perf/arm_cspmu/nvidia_cspmu.c         |  618 +++++++++-
 drivers/perf/nvidia_t410_c2c_pmu.c            | 1051 +++++++++++++++++
 drivers/perf/nvidia_t410_cmem_latency_pmu.c   |  736 ++++++++++++
 11 files changed, 2979 insertions(+), 13 deletions(-)
 rename Documentation/admin-guide/perf/{nvidia-pmu.rst => nvidia-tegra241-pmu.rst} (98%)
 create mode 100644 Documentation/admin-guide/perf/nvidia-tegra410-pmu.rst
 create mode 100644 drivers/perf/nvidia_t410_c2c_pmu.c
 create mode 100644 drivers/perf/nvidia_t410_cmem_latency_pmu.c

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2.43.0