diff mbox series

[v3,bpf-next,2/3] tools/bpf: Sync uapi header bpf.h

Message ID 20200123212312.3963-3-dxu@dxuuu.xyz
State Changes Requested
Delegated to: BPF Maintainers
Headers show
Series Add bpf_perf_prog_read_branches() helper | expand

Commit Message

Daniel Xu Jan. 23, 2020, 9:23 p.m. UTC 
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
---
 tools/include/uapi/linux/bpf.h | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
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Patch

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index f1d74a2bd234..50c580c8a201 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2892,6 +2892,18 @@  union bpf_attr {
  *		Obtain the 64bit jiffies
  *	Return
  *		The 64 bit jiffies
+ *
+ * int bpf_perf_prog_read_branches(struct bpf_perf_event_data *ctx, void *buf, u32 buf_size)
+ *	Description
+ *		For en eBPF program attached to a perf event, retrieve the
+ *		branch records (struct perf_branch_entry) associated to *ctx*
+ *		and store it in	the buffer pointed by *buf* up to size
+ *		*buf_size* bytes.
+ *
+ *		Any unused parts of *buf* will be filled with zeros.
+ *	Return
+ *		On success, number of bytes written to *buf*. On error, a
+ *		negative value.
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -3012,7 +3024,8 @@  union bpf_attr {
 	FN(probe_read_kernel_str),	\
 	FN(tcp_send_ack),		\
 	FN(send_signal_thread),		\
-	FN(jiffies64),
+	FN(jiffies64),			\
+	FN(perf_prog_read_branches),
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
  * function eBPF program intends to call