[PATCH] arm: l2x0: add PMU support

On Wed, 17 Aug 2016 17:26:31 +0100
Mark Rutland [off-list ref] wrote:

The L2C-220 (AKA L220) and L2C-310 (AKA PL310) cache controllers feature
a Performance Monitoring Unit (PMU), which can be useful for tuning
and/or debugging. This hardware is always present and the relevant
registers are accessible to non-secure accesses. Thus, no special
firmware interface is necessary.

This patch adds support for the PMU, plugging into the usual perf
infrastructure. The overflow interrupt is not always available (e.g. on
RealView PBX A9 it is not wired up at all), and the hardware counters
saturate, so the driver does not make use of this. Instead, the driver
periodically polls and reset counters as required to avoid losing
events due to saturation.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Kim Phillips <redacted>
Cc: Pawel Moll <redacted>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Will Deacon <redacted>
---

FWIW, I was able to test this successfully on a pandaboard.

Thanks,

Kim
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