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authorSong Liu <songliubraving@fb.com>2017-12-06 23:45:16 +0100
committerIngo Molnar <mingo@kernel.org>2018-02-06 11:29:28 +0100
commit33ea4b24277b06dbc55d7f5772a46f029600255e (patch)
treef80ea7a788b1ec87c6bab4d15bbe09c9dd5d978e /kernel/trace/trace_event_perf.c
parentperf/core: Implement the 'perf_kprobe' PMU (diff)
downloadlinux-33ea4b24277b06dbc55d7f5772a46f029600255e.tar.xz
linux-33ea4b24277b06dbc55d7f5772a46f029600255e.zip
perf/core: Implement the 'perf_uprobe' PMU
This patch adds perf_uprobe support with similar pattern as previous patch (for kprobe). Two functions, create_local_trace_uprobe() and destroy_local_trace_uprobe(), are created so a uprobe can be created and attached to the file descriptor created by perf_event_open(). Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Yonghong Song <yhs@fb.com> Reviewed-by: Josef Bacik <jbacik@fb.com> Cc: <daniel@iogearbox.net> Cc: <davem@davemloft.net> Cc: <kernel-team@fb.com> Cc: <rostedt@goodmis.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20171206224518.3598254-7-songliubraving@fb.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/trace/trace_event_perf.c')
-rw-r--r--kernel/trace/trace_event_perf.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 779baade9114..2c416509b834 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -286,6 +286,59 @@ void perf_kprobe_destroy(struct perf_event *p_event)
}
#endif /* CONFIG_KPROBE_EVENTS */
+#ifdef CONFIG_UPROBE_EVENTS
+int perf_uprobe_init(struct perf_event *p_event, bool is_retprobe)
+{
+ int ret;
+ char *path = NULL;
+ struct trace_event_call *tp_event;
+
+ if (!p_event->attr.uprobe_path)
+ return -EINVAL;
+ path = kzalloc(PATH_MAX, GFP_KERNEL);
+ if (!path)
+ return -ENOMEM;
+ ret = strncpy_from_user(
+ path, u64_to_user_ptr(p_event->attr.uprobe_path), PATH_MAX);
+ if (ret < 0)
+ goto out;
+ if (path[0] == '\0') {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ tp_event = create_local_trace_uprobe(
+ path, p_event->attr.probe_offset, is_retprobe);
+ if (IS_ERR(tp_event)) {
+ ret = PTR_ERR(tp_event);
+ goto out;
+ }
+
+ /*
+ * local trace_uprobe need to hold event_mutex to call
+ * uprobe_buffer_enable() and uprobe_buffer_disable().
+ * event_mutex is not required for local trace_kprobes.
+ */
+ mutex_lock(&event_mutex);
+ ret = perf_trace_event_init(tp_event, p_event);
+ if (ret)
+ destroy_local_trace_uprobe(tp_event);
+ mutex_unlock(&event_mutex);
+out:
+ kfree(path);
+ return ret;
+}
+
+void perf_uprobe_destroy(struct perf_event *p_event)
+{
+ mutex_lock(&event_mutex);
+ perf_trace_event_close(p_event);
+ perf_trace_event_unreg(p_event);
+ mutex_unlock(&event_mutex);
+ destroy_local_trace_uprobe(p_event->tp_event);
+}
+#endif /* CONFIG_UPROBE_EVENTS */
+
int perf_trace_add(struct perf_event *p_event, int flags)
{
struct trace_event_call *tp_event = p_event->tp_event;