From patchwork Tue Jan 21 12:05:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 1226420 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 4826gH5WZyz9sRG for ; Tue, 21 Jan 2020 23:05:31 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728655AbgAUMFb convert rfc822-to-8bit (ORCPT ); Tue, 21 Jan 2020 07:05:31 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:22245 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728682AbgAUMFa (ORCPT ); Tue, 21 Jan 2020 07:05:30 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-187-orDdkHyvM-6b6xH0M7sZfg-1; Tue, 21 Jan 2020 07:05:28 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5FC83107ACC4; Tue, 21 Jan 2020 12:05:26 +0000 (UTC) Received: from krava.redhat.com (unknown [10.43.17.48]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0C4525C3FD; Tue, 21 Jan 2020 12:05:23 +0000 (UTC) From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, Andrii Nakryiko , Yonghong Song , Martin KaFai Lau , Jakub Kicinski , David Miller , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , John Fastabend Subject: [PATCH 4/6] bpf: Add bpf_get_stack_kfunc Date: Tue, 21 Jan 2020 13:05:10 +0100 Message-Id: <20200121120512.758929-5-jolsa@kernel.org> In-Reply-To: <20200121120512.758929-1-jolsa@kernel.org> References: <20200121120512.758929-1-jolsa@kernel.org> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-MC-Unique: orDdkHyvM-6b6xH0M7sZfg-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kernel.org Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Adding support to use bpf_get_stack_kfunc in BPF_TRACE_FENTRY/BPF_TRACE_FEXIT programs. Signed-off-by: Jiri Olsa --- kernel/trace/bpf_trace.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 18d6e96751c4..5c8edede3ac4 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1223,6 +1223,32 @@ static const struct bpf_func_proto bpf_get_stackid_proto_kfunc = { .arg3_type = ARG_ANYTHING, }; +BPF_CALL_4(bpf_get_stack_kfunc, void*, args, + void *, buf, u32, size, u64, flags) +{ + struct pt_regs *regs = get_bpf_raw_tp_regs(); + int ret; + + if (IS_ERR(regs)) + return PTR_ERR(regs); + + perf_fetch_caller_regs(regs); + ret = bpf_get_stack((unsigned long) regs, (unsigned long) buf, + (unsigned long) size, flags, 0); + put_bpf_raw_tp_regs(); + return ret; +} + +static const struct bpf_func_proto bpf_get_stack_proto_kfunc = { + .func = bpf_get_stack_raw_tp, + .gpl_only = true, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX, + .arg2_type = ARG_PTR_TO_MEM, + .arg3_type = ARG_CONST_SIZE_OR_ZERO, + .arg4_type = ARG_ANYTHING, +}; + static const struct bpf_func_proto * kfunc_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) { @@ -1231,6 +1257,8 @@ kfunc_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_perf_event_output_proto_kfunc; case BPF_FUNC_get_stackid: return &bpf_get_stackid_proto_kfunc; + case BPF_FUNC_get_stack: + return &bpf_get_stack_proto_kfunc; default: return tracing_func_proto(func_id, prog); }