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perf/core: Implement the 'perf_uprobe' PMU

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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>
This commit is contained in:
Song Liu
2017-12-06 14:45:16 -08:00
committed by Ingo Molnar
parent e12f03d703
commit 33ea4b2427
5 changed files with 186 additions and 9 deletions
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86
kernel/trace/trace_uprobe.c
View File

@@ -1292,16 +1292,25 @@ static struct trace_event_functions uprobe_funcs = {
.trace = print_uprobe_event
};
static int register_uprobe_event(struct trace_uprobe *tu)
static inline void init_trace_event_call(struct trace_uprobe *tu,
struct trace_event_call *call)
{
struct trace_event_call *call = &tu->tp.call;
int ret;
/* Initialize trace_event_call */
INIT_LIST_HEAD(&call->class->fields);
call->event.funcs = &uprobe_funcs;
call->class->define_fields = uprobe_event_define_fields;
call->flags = TRACE_EVENT_FL_UPROBE;
call->class->reg = trace_uprobe_register;
call->data = tu;
}
static int register_uprobe_event(struct trace_uprobe *tu)
{
struct trace_event_call *call = &tu->tp.call;
int ret = 0;
init_trace_event_call(tu, call);
if (set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0)
return -ENOMEM;
@@ -1311,9 +1320,6 @@ static int register_uprobe_event(struct trace_uprobe *tu)
return -ENODEV;
}
call->flags = TRACE_EVENT_FL_UPROBE;
call->class->reg = trace_uprobe_register;
call->data = tu;
ret = trace_add_event_call(call);
if (ret) {
@@ -1339,6 +1345,70 @@ static int unregister_uprobe_event(struct trace_uprobe *tu)
return 0;
}
#ifdef CONFIG_PERF_EVENTS
struct trace_event_call *
create_local_trace_uprobe(char *name, unsigned long offs, bool is_return)
{
struct trace_uprobe *tu;
struct inode *inode;
struct path path;
int ret;
ret = kern_path(name, LOOKUP_FOLLOW, &path);
if (ret)
return ERR_PTR(ret);
inode = igrab(d_inode(path.dentry));
path_put(&path);
if (!inode || !S_ISREG(inode->i_mode)) {
iput(inode);
return ERR_PTR(-EINVAL);
}
/*
* local trace_kprobes are not added to probe_list, so they are never
* searched in find_trace_kprobe(). Therefore, there is no concern of
* duplicated name "DUMMY_EVENT" here.
*/
tu = alloc_trace_uprobe(UPROBE_EVENT_SYSTEM, "DUMMY_EVENT", 0,
is_return);
if (IS_ERR(tu)) {
pr_info("Failed to allocate trace_uprobe.(%d)\n",
(int)PTR_ERR(tu));
return ERR_CAST(tu);
}
tu->offset = offs;
tu->inode = inode;
tu->filename = kstrdup(name, GFP_KERNEL);
init_trace_event_call(tu, &tu->tp.call);
if (set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0) {
ret = -ENOMEM;
goto error;
}
return &tu->tp.call;
error:
free_trace_uprobe(tu);
return ERR_PTR(ret);
}
void destroy_local_trace_uprobe(struct trace_event_call *event_call)
{
struct trace_uprobe *tu;
tu = container_of(event_call, struct trace_uprobe, tp.call);
kfree(tu->tp.call.print_fmt);
tu->tp.call.print_fmt = NULL;
free_trace_uprobe(tu);
}
#endif /* CONFIG_PERF_EVENTS */
/* Make a trace interface for controling probe points */
static __init int init_uprobe_trace(void)
{