diff options
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 16 | ||||
| -rw-r--r-- | tools/lib/bpf/libbpf.h | 16 | ||||
| -rw-r--r-- | tools/lib/bpf/libbpf.map | 1 |
3 files changed, 33 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 68da1aca406c..77ae83308199 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -11734,6 +11734,22 @@ int perf_buffer__buffer_fd(const struct perf_buffer *pb, size_t buf_idx) return cpu_buf->fd; } +int perf_buffer__buffer(struct perf_buffer *pb, int buf_idx, void **buf, size_t *buf_size) +{ + struct perf_cpu_buf *cpu_buf; + + if (buf_idx >= pb->cpu_cnt) + return libbpf_err(-EINVAL); + + cpu_buf = pb->cpu_bufs[buf_idx]; + if (!cpu_buf) + return libbpf_err(-ENOENT); + + *buf = cpu_buf->base; + *buf_size = pb->mmap_size; + return 0; +} + /* * Consume data from perf ring buffer corresponding to slot *buf_idx* in * PERF_EVENT_ARRAY BPF map without waiting/polling. If there is no data to diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index e4d5353f757b..c51d6e6b3066 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -1053,6 +1053,22 @@ LIBBPF_API int perf_buffer__consume(struct perf_buffer *pb); LIBBPF_API int perf_buffer__consume_buffer(struct perf_buffer *pb, size_t buf_idx); LIBBPF_API size_t perf_buffer__buffer_cnt(const struct perf_buffer *pb); LIBBPF_API int perf_buffer__buffer_fd(const struct perf_buffer *pb, size_t buf_idx); +/** + * @brief **perf_buffer__buffer()** returns the per-cpu raw mmap()'ed underlying + * memory region of the ring buffer. + * This ring buffer can be used to implement a custom events consumer. + * The ring buffer starts with the *struct perf_event_mmap_page*, which + * holds the ring buffer managment fields, when accessing the header + * structure it's important to be SMP aware. + * You can refer to *perf_event_read_simple* for a simple example. + * @param pb the perf buffer structure + * @param buf_idx the buffer index to retreive + * @param buf (out) gets the base pointer of the mmap()'ed memory + * @param buf_size (out) gets the size of the mmap()'ed region + * @return 0 on success, negative error code for failure + */ +LIBBPF_API int perf_buffer__buffer(struct perf_buffer *pb, int buf_idx, void **buf, + size_t *buf_size); struct bpf_prog_linfo; struct bpf_prog_info; diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 94b589ecfeaa..4c4c40b8f935 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -362,4 +362,5 @@ LIBBPF_1.0.0 { libbpf_bpf_link_type_str; libbpf_bpf_map_type_str; libbpf_bpf_prog_type_str; + perf_buffer__buffer; }; |