perf bpf: Add wrappers to BPF_FUNC_probe_read(_str) functions

tip:perf/urgent tip-bot for Arnaldo Carvalho de Melo 1 participant 1 message Aug 18, 2018 perf events

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2018-08-18 11:39 UTC #0 lore raw

Commit-ID:  8fa25f303adfed6eab921db8e242e59dd0b3b004
Gitweb:     https://git.kernel.org/tip/8fa25f303adfed6eab921db8e242e59dd0b3b004
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Tue, 7 Aug 2018 15:10:19 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Wed, 8 Aug 2018 15:55:57 -0300

perf bpf: Add wrappers to BPF_FUNC_probe_read(_str) functions

Will be used shortly in the augmented syscalls work together with a PERF_COUNT_SW_BPF_OUTPUT software event to insert syscalls + pointer contents in the perf ring buffer, to be consumed by 'perf trace' beautifiers.

Cc Adrian Hunter <[email protected]>

Cc David Ahern <[email protected]>

Cc Jiri Olsa <[email protected]>

Cc Namhyung Kim <[email protected]>

Cc Wang Nan <[email protected]>

Link https://lkml.kernel.org/n/[email protected] open here

Signed-off-by Arnaldo Carvalho de Melo <[email protected]>

---
 tools/perf/include/bpf/bpf.h | 3 +++
 1 file changed, 3 insertions(+)

tools/perf/include/bpf/bpf.h +3 -0

index 1f632b56bb34..47897d65e799 100644
@@ -30,4 +30,7 @@ struct bpf_map {
 char _license[] SEC("license") = #name; \
 int _version SEC("version") = LINUX_VERSION_CODE;
 
+static int (*probe_read)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read;
+static int (*probe_read_str)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read_str;
+
 #endif /* _PERF_BPF_H */