[PATCH 0/2] perf: Support Arm Bus Monitor Unit

[Robin Murphy <robin.murphy@arm.com>]

Hi all,

Here we have the delight of another new PMU driver. While not am Arm
product in its own right, the BMU is found in the latest Neoverse
Compute Subsystems, including the recently-announced AGI CPU.

For now it is expected that BMU users will be ACPI-based (binding in
the latest "ACPI for Arm Components" release[1]), so the token DT
binding is more for completeness and maybe very early bringup hacking,
but there is a chance it may end up being used by more embedded/client-
focused subsystems in future.

And yes, I did initially look at trying to factor out the PMU register
accesses that functionally overlap the existing arm_cspmu code, but it
very quickly became clear that that would end up far bigger and more
complex. This is not a big driver, even with a few dozen lines of
nominally-duplicate (but also simplified since the counter size etc.
is fixed and known) code, so this way it went.

Thanks,
Robin.

[1] https://developer.arm.com/documentation/den0093/latest/


Robin Murphy (2):
  dt-bindings: perf: Add Arm Bus Monitor Unit
  perf: Add Arm Bus Monitor Unit driver

 .../bindings/perf/arm,bus-monitor-unit.yaml   |  33 ++
 drivers/perf/arm_cspmu/Kconfig                |   6 +
 drivers/perf/arm_cspmu/Makefile               |   2 +
 drivers/perf/arm_cspmu/arm-bmu.c              | 538 ++++++++++++++++++
 4 files changed, 579 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/perf/arm,bus-monitor-unit.yaml
 create mode 100644 drivers/perf/arm_cspmu/arm-bmu.c

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2.54.0.dirty