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| author | Kan Liang <kan.liang@linux.intel.com> | 2024-06-26 07:35:34 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2024-07-04 16:00:36 +0200 |
| commit | 722e42e45c2f1c6d1adec7813651dba5139f52f4 (patch) | |
| tree | 6110b0fd8d8877d8d9e9a9928ab5ff7d430e29a8 /arch/x86/events/intel/knc.c | |
| parent | a23eb2fc1d818cdac9b31f032842d55483a6a040 (diff) | |
| download | lwn-722e42e45c2f1c6d1adec7813651dba5139f52f4.tar.gz lwn-722e42e45c2f1c6d1adec7813651dba5139f52f4.zip | |
perf/x86: Support counter mask
The current perf assumes that both GP and fixed counters are contiguous.
But it's not guaranteed on newer Intel platforms or in a virtualization
environment.
Use the counter mask to replace the number of counters for both GP and
the fixed counters. For the other ARCHs or old platforms which don't
support a counter mask, using GENMASK_ULL(num_counter - 1, 0) to
replace. There is no functional change for them.
The interface to KVM is not changed. The number of counters still be
passed to KVM. It can be updated later separately.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lkml.kernel.org/r/20240626143545.480761-3-kan.liang@linux.intel.com
Diffstat (limited to 'arch/x86/events/intel/knc.c')
| -rw-r--r-- | arch/x86/events/intel/knc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/events/intel/knc.c b/arch/x86/events/intel/knc.c index 618001c208e8..034a1f6a457c 100644 --- a/arch/x86/events/intel/knc.c +++ b/arch/x86/events/intel/knc.c @@ -303,7 +303,7 @@ static const struct x86_pmu knc_pmu __initconst = { .apic = 1, .max_period = (1ULL << 39) - 1, .version = 0, - .num_counters = 2, + .cntr_mask64 = 0x3, .cntval_bits = 40, .cntval_mask = (1ULL << 40) - 1, .get_event_constraints = x86_get_event_constraints, |