perf/core: Verify we have a single perf_hw_context PMU
There should (and can) only be a single PMU for perf_hw_context events. This is because of how we schedule events: once a hardware event fails to schedule (the PMU is 'full') we stop trying to add more. The trivial 'fix' would break the Round-Robin scheduling we do. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -7693,6 +7693,15 @@ int perf_pmu_register(struct pmu *pmu, const char *name, int type)
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}
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skip_type:
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if (pmu->task_ctx_nr == perf_hw_context) {
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static int hw_context_taken = 0;
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if (WARN_ON_ONCE(hw_context_taken))
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pmu->task_ctx_nr = perf_invalid_context;
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hw_context_taken = 1;
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}
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pmu->pmu_cpu_context = find_pmu_context(pmu->task_ctx_nr);
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if (pmu->pmu_cpu_context)
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goto got_cpu_context;
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