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| author | Yicong Yang <yangyicong@hisilicon.com> | 2025-09-25 11:31:23 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2025-09-25 13:51:59 +0100 |
| commit | a084c3c4a2674f156031eb04e785986c2744aca8 (patch) | |
| tree | f67c888db4496e044fa709ac101c6b2c5a19cff3 /Documentation/admin-guide | |
| parent | ea0b39168d3a2313eabd145fb3440c946ccff4d1 (diff) | |
| download | linux-a084c3c4a2674f156031eb04e785986c2744aca8.tar.gz linux-a084c3c4a2674f156031eb04e785986c2744aca8.tar.bz2 linux-a084c3c4a2674f156031eb04e785986c2744aca8.zip | |
drivers/perf: hisi: Add tt_core_deprecated for compatibility
Previously tt_core is defined as config1:0-7 which may not cover all
the CPUs sharing L3C on platforms with more than 8 CPUs in a L3C. In
order to support such platforms extend tt_core to 16 bits, since no
spare space in config1, tt_core was moved to config2:0-15.
Though linux expects the users to retrieve the control encoding from
sysfs first for each option, it's possible if user doesn't follow
this and hardcoded tt_core in config1. So add an option
tt_core_deprecated for config1:0-7 for backward compatibility.
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/perf/hisi-pmu.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/admin-guide/perf/hisi-pmu.rst b/Documentation/admin-guide/perf/hisi-pmu.rst index c4c2cbbf88cb..0017f8ddeb75 100644 --- a/Documentation/admin-guide/perf/hisi-pmu.rst +++ b/Documentation/admin-guide/perf/hisi-pmu.rst @@ -66,6 +66,10 @@ specified as a bitmap:: This will only count the operations from core/thread 0 and 1 in this cluster. +User should not use tt_core_deprecated to specify the core/thread filtering. +This option is provided for backward compatiblility and only support 8bit +which may not cover all the core/thread sharing L3C. + 2. Tracetag allow the user to chose to count only read, write or atomic operations via the tt_req parameeter in perf. The default value counts all operations. tt_req is 3bits, 3'b100 represents read operations, 3'b101 |