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Subject[PATCH v4 1/6] perf: prepare perf_event.h for new types perf_kprobe and perf_uprobe
Date
Two new perf types, perf_kprobe and perf_uprobe, will be added to allow
creating [k,u]probe with perf_event_open. These [k,u]probe are associated
with the file decriptor created by perf_event_open, thus are easy to
clean when the file descriptor is destroyed.

kprobe_func and uprobe_path are added to union config1 for pointers to
function name for kprobe or binary path for uprobe.

kprobe_addr and probe_offset are added to union config2 for kernel
address (when kprobe_func is NULL), or [k,u]probe offset.

Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Yonghong Song <yhs@fb.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
---
include/uapi/linux/perf_event.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 362493a..0f39b31 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -291,6 +291,16 @@ enum perf_event_read_format {
PERF_FORMAT_MAX = 1U << 4, /* non-ABI */
};

+/*
+ * Flags in config, used by dynamic PMU kprobe and uprobe
+ *
+ * PERF_PROBE_CONFIG_IS_RETPROBE if set, create kretprobe/uretprobe
+ * if not set, create kprobe/uprobe
+ */
+enum perf_probe_config {
+ PERF_PROBE_CONFIG_IS_RETPROBE = 1U << 0, /* [k,u]retprobe */
+};
+
#define PERF_ATTR_SIZE_VER0 64 /* sizeof first published struct */
#define PERF_ATTR_SIZE_VER1 72 /* add: config2 */
#define PERF_ATTR_SIZE_VER2 80 /* add: branch_sample_type */
@@ -380,10 +390,14 @@ struct perf_event_attr {
__u32 bp_type;
union {
__u64 bp_addr;
+ __u64 kprobe_func; /* for perf_kprobe */
+ __u64 uprobe_path; /* for perf_uprobe */
__u64 config1; /* extension of config */
};
union {
__u64 bp_len;
+ __u64 kprobe_addr; /* when kprobe_func == NULL */
+ __u64 probe_offset; /* for perf_[k,u]probe */
__u64 config2; /* extension of config1 */
};
__u64 branch_sample_type; /* enum perf_branch_sample_type */
--
2.9.5
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