GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-23 15:27:29 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

arm_pmu: Add support for 64bit event counters

Browse source 
Each PMU has a set of 32bit event counters. But in some
special cases, the events could be counted using counters
which are effectively 64bit wide.

e.g, Arm V8 PMUv3 has a 64 bit cycle counter which can count
only the CPU cycles. Also, the PMU can chain the event counters
to effectively count as a 64bit counter.

Add support for tracking the events that uses 64bit counters.
This only affects the periods set for each counter in the core
driver.

Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Suzuki K Poulose 2018-07-10 09:58:00 +01:00 • committed by Will Deacon
parent 3a95200d3f
commit e2da97d328
2 changed files with 16 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

6
include/linux/perf/arm_pmu.h
View file

@ -25,6 +25,12 @@
*/
#define ARMPMU_MAX_HWEVENTS 32
/*
* ARM PMU hw_event flags
*/
/* Event uses a 64bit counter */
#define ARMPMU_EVT_64BIT 1
#define HW_OP_UNSUPPORTED 0xFFFF
#define C(_x) PERF_COUNT_HW_CACHE_##_x
#define CACHE_OP_UNSUPPORTED 0xFFFF