From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759305AbbA1EGh (ORCPT ); Tue, 27 Jan 2015 23:06:37 -0500 Received: from mail-pd0-f178.google.com ([209.85.192.178]:43100 "EHLO mail-pd0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754490AbbA1EG0 (ORCPT ); Tue, 27 Jan 2015 23:06:26 -0500 From: Alexei Starovoitov To: Steven Rostedt Cc: Ingo Molnar , Namhyung Kim , Arnaldo Carvalho de Melo , Jiri Olsa , Masami Hiramatsu , linux-api@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 linux-trace 2/8] tracing: allow eBPF programs to call ktime_get_ns() Date: Tue, 27 Jan 2015 20:06:07 -0800 Message-Id: <1422417973-10195-3-git-send-email-ast@plumgrid.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1422417973-10195-1-git-send-email-ast@plumgrid.com> References: <1422417973-10195-1-git-send-email-ast@plumgrid.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org bpf_ktime_get_ns() is used by programs to compue time delta between events or as a timestamp Signed-off-by: Alexei Starovoitov --- include/uapi/linux/bpf.h | 1 + kernel/trace/bpf_trace.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 3bf42875287c..227a4e404726 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -169,6 +169,7 @@ enum bpf_func_id { BPF_FUNC_fetch_u16, /* u16 bpf_fetch_u16(void *unsafe_ptr) */ BPF_FUNC_fetch_u8, /* u8 bpf_fetch_u8(void *unsafe_ptr) */ BPF_FUNC_memcmp, /* int bpf_memcmp(void *unsafe_ptr, void *safe_ptr, int size) */ + BPF_FUNC_ktime_get_ns, /* u64 bpf_ktime_get_ns(void) */ __BPF_FUNC_MAX_ID, }; diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 4aabbe2626c5..1c07f55702d6 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -54,6 +54,11 @@ static u64 bpf_memcmp(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) return -1; } +static u64 bpf_ktime_get_ns(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) +{ + return ktime_get_ns(); +} + static struct bpf_func_proto tracing_filter_funcs[] = { #define FETCH(SIZE) \ [BPF_FUNC_fetch_##SIZE] = { \ @@ -75,6 +80,11 @@ static struct bpf_func_proto tracing_filter_funcs[] = { .arg2_type = ARG_PTR_TO_STACK, .arg3_type = ARG_CONST_STACK_SIZE, }, + [BPF_FUNC_ktime_get_ns] = { + .func = bpf_ktime_get_ns, + .gpl_only = true, + .ret_type = RET_INTEGER, + }, }; static const struct bpf_func_proto *tracing_filter_func_proto(enum bpf_func_id func_id) -- 1.7.9.5