6cd70754f2
In order to support usersapce access, an event must be mmapped. While there's already mmap support for evlist, the usecase is a bit different than the self monitoring with userspace access. So let's add new perf_evsel__mmap()/perf_evsel_munmap() functions to mmap/munmap an evsel. This allows implementing userspace access as a fastpath for perf_evsel__read(). The mmapped address is returned by perf_evsel__mmap_base() which primarily for users/tests to check if userspace access is enabled. Signed-off-by: Rob Herring <robh@kernel.org> Acked-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Itaru Kitayama <itaru.kitayama@gmail.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will@kernel.org> Link: http://lore.kernel.org/lkml/20210414155412.3697605-2-robh@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LIBPERF_EVSEL_H
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#define __LIBPERF_EVSEL_H
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#include <stdint.h>
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#include <perf/core.h>
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struct perf_evsel;
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struct perf_event_attr;
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struct perf_cpu_map;
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struct perf_thread_map;
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struct perf_counts_values {
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union {
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struct {
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uint64_t val;
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uint64_t ena;
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uint64_t run;
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};
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uint64_t values[3];
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};
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};
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LIBPERF_API struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr);
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LIBPERF_API void perf_evsel__delete(struct perf_evsel *evsel);
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LIBPERF_API int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
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struct perf_thread_map *threads);
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LIBPERF_API void perf_evsel__close(struct perf_evsel *evsel);
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LIBPERF_API void perf_evsel__close_cpu(struct perf_evsel *evsel, int cpu);
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LIBPERF_API int perf_evsel__mmap(struct perf_evsel *evsel, int pages);
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LIBPERF_API void perf_evsel__munmap(struct perf_evsel *evsel);
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LIBPERF_API void *perf_evsel__mmap_base(struct perf_evsel *evsel, int cpu, int thread);
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LIBPERF_API int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
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struct perf_counts_values *count);
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LIBPERF_API int perf_evsel__enable(struct perf_evsel *evsel);
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LIBPERF_API int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu);
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LIBPERF_API int perf_evsel__disable(struct perf_evsel *evsel);
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LIBPERF_API int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu);
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LIBPERF_API struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel);
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LIBPERF_API struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel);
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LIBPERF_API struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel);
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#endif /* __LIBPERF_EVSEL_H */
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