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>
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LIBPERF_INTERNAL_EVSEL_H
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#define __LIBPERF_INTERNAL_EVSEL_H
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#include <linux/types.h>
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#include <linux/perf_event.h>
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#include <stdbool.h>
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#include <sys/types.h>
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struct perf_cpu_map;
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struct perf_thread_map;
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struct xyarray;
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/*
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* Per fd, to map back from PERF_SAMPLE_ID to evsel, only used when there are
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* more than one entry in the evlist.
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*/
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struct perf_sample_id {
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struct hlist_node node;
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u64 id;
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struct perf_evsel *evsel;
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/*
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* 'idx' will be used for AUX area sampling. A sample will have AUX area
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* data that will be queued for decoding, where there are separate
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* queues for each CPU (per-cpu tracing) or task (per-thread tracing).
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* The sample ID can be used to lookup 'idx' which is effectively the
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* queue number.
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*/
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int idx;
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int cpu;
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pid_t tid;
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/* Holds total ID period value for PERF_SAMPLE_READ processing. */
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u64 period;
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};
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struct perf_evsel {
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struct list_head node;
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struct perf_event_attr attr;
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struct perf_cpu_map *cpus;
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struct perf_cpu_map *own_cpus;
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struct perf_thread_map *threads;
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struct xyarray *fd;
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struct xyarray *mmap;
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struct xyarray *sample_id;
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u64 *id;
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u32 ids;
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/* parse modifier helper */
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int nr_members;
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bool system_wide;
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};
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void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr);
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int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads);
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void perf_evsel__close_fd(struct perf_evsel *evsel);
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void perf_evsel__free_fd(struct perf_evsel *evsel);
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int perf_evsel__read_size(struct perf_evsel *evsel);
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int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter);
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int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads);
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void perf_evsel__free_id(struct perf_evsel *evsel);
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#endif /* __LIBPERF_INTERNAL_EVSEL_H */
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