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| author | Shaokun Zhang <zhangshaokun@hisilicon.com> | 2020-09-22 13:53:45 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-09-28 14:53:45 +0100 |
| commit | f5be3a61fdb5dd11ef60173e2783ccf62685f892 (patch) | |
| tree | 53bf50bc3ad0fba39c7084b4a295925ab7f9b1ca /Documentation | |
| parent | 688494a407d1419a6b158c644b262c61cde39f48 (diff) | |
| download | linux-f5be3a61fdb5dd11ef60173e2783ccf62685f892.tar.bz2 | |
arm64: perf: Add support caps under sysfs
ARMv8.4-PMU introduces the PMMIR_EL1 registers and some new PMU events,
like STALL_SLOT etc, are related to it. Let's add a caps directory to
/sys/bus/event_source/devices/armv8_pmuv3_0/ and support slots from
PMMIR_EL1 registers in this entry. The user programs can get the slots
from sysfs directly.
/sys/bus/event_source/devices/armv8_pmuv3_0/caps/slots is exposed
under sysfs. Both ARMv8.4-PMU and STALL_SLOT event are implemented,
it returns the slots from PMMIR_EL1, otherwise it will return 0.
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/1600754025-53535-1-git-send-email-zhangshaokun@hisilicon.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions