From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2ADFC433EF for ; Thu, 7 Jul 2022 07:14:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230120AbiGGHOE (ORCPT ); Thu, 7 Jul 2022 03:14:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37768 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234324AbiGGHOB (ORCPT ); Thu, 7 Jul 2022 03:14:01 -0400 Received: from mail-wr1-x434.google.com (mail-wr1-x434.google.com [IPv6:2a00:1450:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F0DF2FFC9 for ; Thu, 7 Jul 2022 00:14:00 -0700 (PDT) Received: by mail-wr1-x434.google.com with SMTP id s1so24971026wra.9 for ; Thu, 07 Jul 2022 00:14:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=YRCuLQR+YYdyH8ItaWoVjGZ7iB5/Td9YEOP/4JYUmHk=; b=cZuLiG9U/KtKRh/UHJrErJf4DxCCvPHz62LLNJQTNM+tRajnt+XiKu/n5RQC/oAgh4 Bjzwc930J7w90hy02yC3WLqvtjXz5KRHRfdkjDZj703sCl3e9s/lA54geQj/ONK4O4xG n45idrZ3qKgcoJ5Z6i9rDylDXWQ6phiSngOza791cXYNzpoebfOlKRX/Dmkeyrfh5UrY 5T6NTS3CkJSpJ88D8iR6xSeffszRIg269BnDzF1VVvbBrOM+zYptrL4MzPY9NZIDJ4mh W+SihIERbTdLQijXFYy5azaDGRhIiN2WbkD4zvlZTBYt4rAcj/kvbRoJg+8YhhVmlaS+ 8Luw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=YRCuLQR+YYdyH8ItaWoVjGZ7iB5/Td9YEOP/4JYUmHk=; b=3olM4wocnjexqshgnZjoHnIT8h87OBuAzB2IdzumFCKHhxjBVMANltreEKS7z+x+Wk EqceChTTeEU71ka2rZpfD/NEE5cOYNfBfllv5Rz97/LBCmzUxS9GapeliefW4u905w6y 9ig7gLEpxplNe7D+v4Mfchv6Giud7DrVT22n/Om5qOD9ZPrvHVtwvYTVjWZcqK16U+zE R2WyJl2FjVwnpQRnfD2+UW/6C+kToG+kwdv6pcRKDxozXXo8BzmQdPKc9WwWlYGsXlwd oOJHMwmoNQUfpdg3tzHdvdGaJF//tTWyI4yyOcFdla5KqZmxdkfgiYhh8WCFksYZosNy 64nQ== X-Gm-Message-State: AJIora9IceCkV5atAQmaOP1Lsx27npDwOHaTfUck3Gufm/1NxCwg58cR CS5FKijPE/ef9Kd0zENt4HnggdtQ9tM= X-Google-Smtp-Source: AGRyM1vQboKLIeU4KLN1li3/pBpHRqLvyQVoWpIXpqr5X2bMKjZWWDRzVjqPc80JB2DlR6kvCU6WKg== X-Received: by 2002:a5d:6d46:0:b0:21b:933d:7950 with SMTP id k6-20020a5d6d46000000b0021b933d7950mr40842038wri.679.1657178038778; Thu, 07 Jul 2022 00:13:58 -0700 (PDT) Received: from localhost.localdomain ([2a0d:6fc2:4af0:cc00:f99d:5d19:6e17:dc3a]) by smtp.gmail.com with ESMTPSA id g14-20020a7bc4ce000000b003a2cf1ba9e2sm855604wmk.6.2022.07.07.00.13.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jul 2022 00:13:58 -0700 (PDT) From: Jon Doron To: bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net Cc: Jon Doron Subject: [PATCH v1 1/1] libbpf: perfbuf: allow raw access to buffers Date: Thu, 7 Jul 2022 10:13:39 +0300 Message-Id: <20220707071339.1486742-2-arilou@gmail.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220707071339.1486742-1-arilou@gmail.com> References: <20220707071339.1486742-1-arilou@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org From: Jon Doron Add API for perfbuf to support writing a custom event reader. Signed-off-by: Jon Doron --- tools/lib/bpf/libbpf.c | 40 ++++++++++++++++++++++++++++++++++++++++ tools/lib/bpf/libbpf.h | 6 ++++++ 2 files changed, 46 insertions(+) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index e89cc9c885b3..37299aa05185 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -12433,6 +12433,46 @@ static int perf_buffer__process_records(struct perf_buffer *pb, return 0; } +int perf_buffer__raw_ring_buf(const struct perf_buffer *pb, size_t buf_idx, + void **base, size_t *buf_size, __u64 *head, + __u64 *tail) +{ + struct perf_cpu_buf *cpu_buf; + struct perf_event_mmap_page *header; + + if (buf_idx >= pb->cpu_cnt) + return libbpf_err(-EINVAL); + + cpu_buf = pb->cpu_bufs[buf_idx]; + if (!cpu_buf) + return libbpf_err(-ENOENT); + + header = cpu_buf->base; + *head = ring_buffer_read_head(header); + *tail = header->data_tail; + *base = ((__u8 *)header) + pb->page_size; + *buf_size = pb->mmap_size; + return 0; +} + +int perf_buffer__set_ring_buf_tail(const struct perf_buffer *pb, size_t buf_idx, + __u64 tail) +{ + struct perf_cpu_buf *cpu_buf; + struct perf_event_mmap_page *header; + + if (buf_idx >= pb->cpu_cnt) + return libbpf_err(-EINVAL); + + cpu_buf = pb->cpu_bufs[buf_idx]; + if (!cpu_buf) + return libbpf_err(-ENOENT); + + header = cpu_buf->base; + ring_buffer_write_tail(header, tail); + return 0; +} + int perf_buffer__epoll_fd(const struct perf_buffer *pb) { return pb->epoll_fd; diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 9e9a3fd3edd8..b6f6b6a12d70 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -1381,6 +1381,12 @@ LIBBPF_API int perf_buffer__consume(struct perf_buffer *pb); LIBBPF_API int perf_buffer__consume_buffer(struct perf_buffer *pb, size_t buf_idx); LIBBPF_API size_t perf_buffer__buffer_cnt(const struct perf_buffer *pb); LIBBPF_API int perf_buffer__buffer_fd(const struct perf_buffer *pb, size_t buf_idx); +LIBBPF_API int perf_buffer__raw_ring_buf(const struct perf_buffer *pb, + size_t buf_idx, void **base, + size_t *buf_size, __u64 *head, + __u64 *tail); +LIBBPF_API int perf_buffer__set_ring_buf_tail(const struct perf_buffer *pb, + size_t buf_idx, __u64 tail); typedef enum bpf_perf_event_ret (*bpf_perf_event_print_t)(struct perf_event_header *hdr, -- 2.36.1