By extending the syntax of BPF object section names, this patch allows
user to attach BPF programs to symbol in modules. For example:
SEC("module=i915\n"
"parse_cmds=i915_parse_cmds")
int parse_cmds(void *ctx)
{
return 1;
}
Implementation is very simple: like what 'perf probe' does, for module,
fill 'uprobe' field in 'struct perf_probe_event'. Other parts would be
done automatically.
Signed-off-by: Wang Nan <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Brendan Gregg <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: David Ahern <[email protected]>
Cc: He Kuang <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kaixu Xia <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Zefan Li <[email protected]>
Cc: [email protected]
Cc: Arnaldo Carvalho de Melo <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
---
This patch is based on commit ad14ba45236a496a7ce25f4ea947d245b1406e40
in my git tree[1], and will be appear in the next pull request of this
perf eBPF support patchset.
[1] https://git.kernel.org/cgit/linux/kernel/git/pi3orama/linux.git
---
tools/perf/util/bpf-loader.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index b14aff4..a85caae 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -120,10 +120,17 @@ do_config(const char *key, const char *value,
pev->target = strdup(value);
return 0;
}
+ if (strcmp(key, "module") == 0) {
+ pev->uprobes = false;
+ pev->target = strdup(value);
+ return 0;
+ }
pr_warning("BPF: WARNING: invalid config option in object: %s=%s\n",
key, value);
- pr_warning("\tHint: Currently only valid option is 'exec=<full patch of
file>'\n");
+ pr_warning("\tHint: Currently valid options are:\n");
+ pr_warning("\t 'exec=<full patch of file>'\n");
+ pr_warning("\t 'module=<module name>'\n");
return 0;
}
--
1.8.3.4
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