Add driver support for ARM CoreSight PMU device and event attributes for NVIDIA
implementation. The code is based on ARM Coresight PMU architecture and ACPI ARM
Performance Monitoring Unit table (APMT) specification below:
* ARM Coresight PMU:
https://developer.arm.com/documentation/ihi0091/latest
* APMT: https://developer.arm.com/documentation/den0117/latest
Notes:
* There is a concern on the naming of the PMU device.
Currently the driver is probing "arm-coresight-pmu" device, however the APMT
spec supports different kinds of CoreSight PMU based implementation. So it is
open for discussion if the name can stay or a "generic" name is required.
Please see the following thread:
http://lists.infradead.org/pipermail/linux-arm-kernel/2022-May/740485.html
The patchset applies on top of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
master next-20220524
Changes from v2:
* Driver is now probing "arm-system-pmu" device.
* Change default PMU naming to "arm_<APMT node type>_pmu".
* Add implementor ops to generate custom name.
Thanks to suzuki.poulose@xxxxxxx for the review comments.
Changes from v1:
* Remove CPU arch dependency.
* Remove 32-bit read/write helper function and just use read/writel.
* Add .is_visible into event attribute to filter out cycle counter event.
* Update pmiidr matching.
* Remove read-modify-write on PMCR since the driver only writes to PMCR.E.
* Assign default cycle event outside the 32-bit PMEVTYPER range.
* Rework the active event and used counter tracking.
Thanks to robin.murphy@xxxxxxx for the review comments.
Besar Wicaksono (2):
perf: coresight_pmu: Add support for ARM CoreSight PMU driver
perf: coresight_pmu: Add support for NVIDIA SCF and MCF attribute
arch/arm64/configs/defconfig | 1 +
drivers/perf/Kconfig | 2 +
drivers/perf/Makefile | 1 +
drivers/perf/coresight_pmu/Kconfig | 11 +
drivers/perf/coresight_pmu/Makefile | 7 +
.../perf/coresight_pmu/arm_coresight_pmu.c | 1316 +++++++++++++++++
.../perf/coresight_pmu/arm_coresight_pmu.h | 177 +++
.../coresight_pmu/arm_coresight_pmu_nvidia.c | 312 ++++
.../coresight_pmu/arm_coresight_pmu_nvidia.h | 17 +
9 files changed, 1844 insertions(+)
create mode 100644 drivers/perf/coresight_pmu/Kconfig
create mode 100644 drivers/perf/coresight_pmu/Makefile
create mode 100644 drivers/perf/coresight_pmu/arm_coresight_pmu.c
create mode 100644 drivers/perf/coresight_pmu/arm_coresight_pmu.h
create mode 100644 drivers/perf/coresight_pmu/arm_coresight_pmu_nvidia.c
create mode 100644 drivers/perf/coresight_pmu/arm_coresight_pmu_nvidia.h
base-commit: 09ce5091ff971cdbfd67ad84dc561ea27f10d67a
--
2.17.1
