Re: [PATCH v8 20/22] tools/perf: Add RISC-V CounterIDMask event field
From: Ian Rogers <irogers@google.com>
Date: 2026-07-01 17:45:15
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linux-arm-kernel, linux-perf-users, linux-riscv, lkml
On Wed, Jul 1, 2026 at 1:48 AM Atish Patra [off-list ref] wrote:
From: Atish Patra <redacted> Counter delegation lets supervisor mode choose the hpmcounter for an event, but the hardware may only allow a given event on a subset of counters. Add a RISC-V specific "CounterIDMask" json event field, handled like the other arch-specific entries in event_fields[], that carries the allowed-counter bitmask through to the driver's existing counterid_mask (config2:0-31) format. The value is the bitmask directly so no counter-list to bitmask conversion is needed, and because the field is RISC-V specific it is a no-op for every other architecture's events (unlike the shared "Counter" field). Signed-off-by: Atish Patra <redacted>
Reviewed-by: Ian Rogers <irogers@google.com> Thanks, Ian
quoted hunk ↗ jump to hunk
--- tools/perf/pmu-events/jevents.py | 1 + 1 file changed, 1 insertion(+)diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py index 0cf9d26315b3..516fb73886ed 100755 --- a/tools/perf/pmu-events/jevents.py +++ b/tools/perf/pmu-events/jevents.py@@ -396,6 +396,7 @@ class JsonEvent: ('EnAllSlices', 'enallslices='), ('SliceId', 'sliceid='), ('ThreadMask', 'threadmask='), + ('CounterIDMask', 'counterid_mask='), ] for key, value in event_fields: if key in jd and not is_zero(jd[key]): --2.53.0-Meta