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| author | Mark Rutland <mark.rutland@arm.com> | 2016-09-02 11:35:18 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2016-09-06 16:51:09 +0200 |
| commit | b828f960215f02e5d2c88bbd27565c694254a15a (patch) | |
| tree | 7932c62969fc7ce5eaec0aec99b23b89d49a0829 /arch/arm/mm/Kconfig | |
| parent | ARM: 8610/1: V7M: Add dsb before jumping in handler mode (diff) | |
| download | linux-b828f960215f02e5d2c88bbd27565c694254a15a.tar.xz linux-b828f960215f02e5d2c88bbd27565c694254a15a.zip | |
ARM: 8611/1: l2x0: add PMU support
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>
Acked-by: Pawel Moll <pawel.moll@arm.com>
Tested-by: Kim Phillips <kim.phillips@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/Kconfig')
| -rw-r--r-- | arch/arm/mm/Kconfig | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index e613122e5e1b..c1799dd1d0d9 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -920,6 +920,13 @@ config CACHE_L2X0 help This option enables the L2x0 PrimeCell. +config CACHE_L2X0_PMU + bool "L2x0 performance monitor support" if CACHE_L2X0 + depends on PERF_EVENTS + help + This option enables support for the performance monitoring features + of the L220 and PL310 outer cache controllers. + if CACHE_L2X0 config PL310_ERRATA_588369 |