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From: Kris Van Hees <kris.van.hees@oracle.com>
To: netdev@vger.kernel.org, bpf@vger.kernel.org,
	dtrace-devel@oss.oracle.com, linux-kernel@vger.kernel.org
Cc: rostedt@goodmis.org, mhiramat@kernel.org, acme@kernel.org,
	ast@kernel.org, daniel@iogearbox.net
Subject: [RFC PATCH 03/11] bpf: export proto for bpf_perf_event_output helper
Date: Tue, 21 May 2019 20:39:38 +0000 (UTC)
Message-ID: <201905212039.x4LKddbl023199@aserv0121.oracle.com> (raw)
In-Reply-To: <201905202347.x4KNl0cs030532@aserv0121.oracle.com>

The bpf_perf_event_output helper is used by various tracer BPF program
types, but it was not visible outside of bpf_trace.c.  In order to make
it available to tracer BPF program types that are implemented elsewhere,
a function is added similar to bpf_get_trace_printk_proto() to query the
prototype (bpf_get_perf_event_output_proto()).

Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Reviewed-by: Nick Alcock <nick.alcock@oracle.com>
---
 include/linux/bpf.h      | 1 +
 kernel/trace/bpf_trace.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 7a40a3cd7ff2..e4bcb79656c4 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -479,6 +479,7 @@ bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *f
 int bpf_prog_calc_tag(struct bpf_prog *fp);
 
 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
+const struct bpf_func_proto *bpf_get_perf_event_output_proto(void);
 
 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
 					unsigned long off, unsigned long len);
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index b496ffdf5f36..3d812238bc40 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -473,6 +473,12 @@ static const struct bpf_func_proto bpf_perf_event_output_proto = {
 	.arg5_type	= ARG_CONST_SIZE_OR_ZERO,
 };
 
+const struct bpf_func_proto *bpf_get_perf_event_output_proto(void)
+{
+	return &bpf_perf_event_output_proto;
+}
+
+
 static DEFINE_PER_CPU(struct pt_regs, bpf_pt_regs);
 static DEFINE_PER_CPU(struct perf_sample_data, bpf_misc_sd);
 
-- 
2.20.1


  parent reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-20 23:47 [RFC PATCH 00/11] bpf, trace, dtrace: DTrace BPF program type implementation and sample use Kris Van Hees
2019-05-21 17:56 ` Alexei Starovoitov
2019-05-21 18:41   ` Kris Van Hees
2019-05-21 20:55     ` Alexei Starovoitov
2019-05-21 21:36       ` Steven Rostedt
2019-05-21 21:43         ` Alexei Starovoitov
2019-05-21 21:48           ` Steven Rostedt
2019-05-22  5:23             ` Kris Van Hees
2019-05-22 20:53               ` Alexei Starovoitov
2019-05-23  5:46                 ` Kris Van Hees
2019-05-23 21:13                   ` Alexei Starovoitov
2019-05-23 23:02                     ` Steven Rostedt
2019-05-24  0:31                       ` Alexei Starovoitov
2019-05-24  1:57                         ` Steven Rostedt
2019-05-24  2:08                           ` Alexei Starovoitov
2019-05-24  2:40                             ` Steven Rostedt
2019-05-24  5:26                             ` Kris Van Hees
2019-05-24  5:10                       ` Kris Van Hees
2019-05-24  4:05                     ` Kris Van Hees
2019-05-24 13:28                       ` Steven Rostedt
2019-05-21 21:36       ` Kris Van Hees
2019-05-21 23:26         ` Alexei Starovoitov
2019-05-22  4:12           ` Kris Van Hees
2019-05-22 20:16             ` Alexei Starovoitov
2019-05-23  5:16               ` Kris Van Hees
2019-05-23 20:28                 ` Alexei Starovoitov
2019-05-30 16:15                   ` Kris Van Hees
2019-05-31 15:25                     ` Chris Mason
2019-06-06 20:58                       ` Kris Van Hees
2019-06-18  1:25                   ` Kris Van Hees
2019-06-18  1:32                     ` Alexei Starovoitov
2019-06-18  1:54                       ` Kris Van Hees
2019-06-18  3:01                         ` Alexei Starovoitov
2019-06-18  3:19                           ` Kris Van Hees
2019-05-22 14:25   ` Peter Zijlstra
2019-05-22 18:22     ` Kris Van Hees
2019-05-22 19:55       ` Alexei Starovoitov
2019-05-22 20:20         ` David Miller
2019-05-23  5:19         ` Kris Van Hees
2019-05-24  7:27       ` Peter Zijlstra
2019-05-21 20:39 ` [RFC PATCH 01/11] bpf: context casting for tail call Kris Van Hees
2019-05-21 20:39 ` [RFC PATCH 02/11] bpf: add BPF_PROG_TYPE_DTRACE Kris Van Hees
2019-05-21 20:39 ` Kris Van Hees [this message]
     [not found] ` <facilities>
2019-05-21 20:39   ` [RFC PATCH 04/11] trace: initial implementation of DTrace based on kernel Kris Van Hees
2019-05-21 20:39 ` [RFC PATCH 05/11] trace: update Kconfig and Makefile to include DTrace Kris Van Hees
     [not found] ` <features>
2019-05-21 20:39   ` [RFC PATCH 06/11] dtrace: tiny userspace tool to exercise DTrace support Kris Van Hees
2019-05-21 20:39 ` [RFC PATCH 07/11] bpf: implement writable buffers in contexts Kris Van Hees
2019-05-21 20:39 ` [RFC PATCH 08/11] perf: add perf_output_begin_forward_in_page Kris Van Hees
     [not found] ` <the>
     [not found]   ` <context>
2019-05-21 20:39     ` [RFC PATCH 09/11] bpf: mark helpers explicitly whether they may change Kris Van Hees
     [not found] ` <helpers>
2019-05-21 20:39   ` [RFC PATCH 10/11] bpf: add bpf_buffer_reserve and bpf_buffer_commit Kris Van Hees
2019-05-21 20:40 ` [RFC PATCH 11/11] dtrace: make use of writable buffers in BPF Kris Van Hees
2019-05-21 20:48 ` [RFC PATCH 00/11] bpf, trace, dtrace: DTrace BPF program type implementation and sample use Kris Van Hees
2019-05-21 20:54   ` Steven Rostedt
2019-05-21 20:56   ` Alexei Starovoitov
2019-05-20 23:50 [RFC PATCH 03/11] bpf: export proto for bpf_perf_event_output helper Kris Van Hees

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