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bpf/tracing: add a bpf test for new ioctl query interface

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Added a subtest in test_progs. The tracepoint is
sched/sched_switch. Multiple bpf programs are attached to
this tracepoint and the query interface is exercised.

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song
2017-12-11 11:39:03 -08:00
committed by Alexei Starovoitov
parent f371b304f1
commit d279f1f8c6
4 changed files with 182 additions and 1 deletions
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22
tools/include/uapi/linux/perf_event.h
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@@ -418,6 +418,27 @@ struct perf_event_attr {
__u16 __reserved_2; /* align to __u64 */
};
/*
* Structure used by below PERF_EVENT_IOC_QUERY_BPF command
* to query bpf programs attached to the same perf tracepoint
* as the given perf event.
*/
struct perf_event_query_bpf {
/*
* The below ids array length
*/
__u32 ids_len;
/*
* Set by the kernel to indicate the number of
* available programs
*/
__u32 prog_cnt;
/*
* User provided buffer to store program ids
*/
__u32 ids[0];
};
#define perf_flags(attr) (*(&(attr)->read_format + 1))
/*
@@ -433,6 +454,7 @@ struct perf_event_attr {
#define PERF_EVENT_IOC_ID _IOR('$', 7, __u64 *)
#define PERF_EVENT_IOC_SET_BPF _IOW('$', 8, __u32)
#define PERF_EVENT_IOC_PAUSE_OUTPUT _IOW('$', 9, __u32)
#define PERF_EVENT_IOC_QUERY_BPF _IOWR('$', 10, struct perf_event_query_bpf *)
enum perf_event_ioc_flags {
PERF_IOC_FLAG_GROUP = 1U << 0,