linux-kernel - [PATCH v4 1/6] perf: prepare perf_event.h for new types perf_kprobe and perf

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Message-ID: <20171205012729.358860-4-songliubraving@fb.com>
Date:   Mon, 4 Dec 2017 17:27:24 -0800
From:   Song Liu <songliubraving@...com>
To:     <peterz@...radead.org>, <rostedt@...dmis.org>, <mingo@...hat.com>,
        <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <daniel@...earbox.net>
CC:     <kernel-team@...com>, Song Liu <songliubraving@...com>
Subject: [PATCH v4 1/6] perf: prepare perf_event.h for new types perf_kprobe and perf_uprobe

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@...com>
Reviewed-by: Yonghong Song <yhs@...com>
Reviewed-by: Josef Bacik <jbacik@...com>
Acked-by: Alexei Starovoitov <ast@...nel.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