linux-kernel - [PATCH v4 bpf-next 2/3] tools/bpf: Sync uapi header bpf.h

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Date:   Fri, 24 Jan 2020 13:17:04 -0800
From:   Daniel Xu <dxu@...uu.xyz>
To:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        songliubraving@...com, yhs@...com, andriin@...com
Cc:     Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
        kernel-team@...com, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org
Subject: [PATCH v4 bpf-next 2/3] tools/bpf: Sync uapi header bpf.h

Sync the header file in a separate commit to help with external sync.

Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 tools/include/uapi/linux/bpf.h | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index f1d74a2bd234..39bfba0091dc 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2892,6 +2892,25 @@ 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, u64 flags)
+ *	Description
+ *		For an 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.
+ *
+ *		The *flags* can be set to **BPF_F_GET_BR_SIZE** to instead
+ *		return the number of bytes required to store all the branch
+ *		entries. If this flag is set, *buf* may be NULL.
+ *	Return
+ *		On success, number of bytes written to *buf*. On error, a
+ *		negative value.
+ *
+ *		**-EINVAL** if arguments invalid or **buf_size** not a multiple
+ *		of sizeof(struct perf_branch_entry).
+ *
+ *		**-ENOENT** if architecture does not support branch records.
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -3012,7 +3031,8 @@ 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
@@ -3091,6 +3111,9 @@ enum bpf_func_id {
 /* BPF_FUNC_sk_storage_get flags */
 #define BPF_SK_STORAGE_GET_F_CREATE	(1ULL << 0)
 
+/* BPF_FUNC_perf_prog_read_branches flags. */
+#define BPF_F_GET_BR_SIZE		(1ULL << 0)
+
 /* Mode for BPF_FUNC_skb_adjust_room helper. */
 enum bpf_adj_room_mode {
 	BPF_ADJ_ROOM_NET,
-- 
2.21.1