linux-kernel - [PATCH v2 1/6] perf: Add new types PERF_TYPE_KPROBE and PERF_TYPE

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Date:   Wed, 29 Nov 2017 17:44:41 -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 v2 1/6] perf: Add new types PERF_TYPE_KPROBE and PERF_TYPE_UPROBE

Two new perf types, PERF_TYPE_KPROBE and PERF_TYPE_UPROBE, are 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 | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 362493a..5220600 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -33,6 +33,8 @@ enum perf_type_id {
 	PERF_TYPE_HW_CACHE			= 3,
 	PERF_TYPE_RAW				= 4,
 	PERF_TYPE_BREAKPOINT			= 5,
+	PERF_TYPE_KPROBE			= 6,
+	PERF_TYPE_UPROBE			= 7,
 
 	PERF_TYPE_MAX,				/* non-ABI */
 };
@@ -299,6 +301,8 @@ enum perf_event_read_format {
 #define PERF_ATTR_SIZE_VER4	104	/* add: sample_regs_intr */
 #define PERF_ATTR_SIZE_VER5	112	/* add: aux_watermark */
 
+#define MAX_PROBE_FUNC_NAME_LEN 64
+
 /*
  * Hardware event_id to monitor via a performance monitoring event:
  *
@@ -380,10 +384,14 @@ struct perf_event_attr {
 	__u32			bp_type;
 	union {
 		__u64		bp_addr;
+		__u64		kprobe_func; /* for PERF_TYPE_KPROBE */
+		__u64		uprobe_path; /* for PERF_TYPE_UPROBE */
 		__u64		config1; /* extension of config */
 	};
 	union {
 		__u64		bp_len;
+		__u64		kprobe_addr; /* for PERF_TYPE_KPROBE, with kprobe_func == NULL */
+		__u64		probe_offset; /* for PERF_TYPE_[K,U]PROBE */
 		__u64		config2; /* extension of config1 */
 	};
 	__u64	branch_sample_type; /* enum perf_branch_sample_type */
-- 
2.9.5