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 X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD7BDC10F03 for ; Fri, 22 Mar 2019 12:59:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8C728213F2 for ; Fri, 22 Mar 2019 12:59:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553259578; bh=FfYhh7AfQEM5Q+Mfb3OmIYdkXyCpLZWxkFSW4aZSsMU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NG+S9CsOVEV+FQIORXRfT2HuA/Jy+6U4icjg1EdLglAv3btBLCUBmLx/J4oE+g78s Y89eCV95yZqwCQwH+i6skU1rAOSjr2V9MZWIHk1ljcU53SZImnbFL7azNpOHbGNp+r biZxQazdq6P8WGILTc3Kz9yyvGpgUvwQJSjJI87Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729703AbfCVLpQ (ORCPT ); Fri, 22 Mar 2019 07:45:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:48332 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731925AbfCVLpN (ORCPT ); Fri, 22 Mar 2019 07:45:13 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 271BA2082C; Fri, 22 Mar 2019 11:45:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553255112; bh=FfYhh7AfQEM5Q+Mfb3OmIYdkXyCpLZWxkFSW4aZSsMU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xC9NdvAc78FvKK3eGv4P9wie3JvNUnvmu4IRamhrteNGGkcau/6sEeNvaW2HdlAcO ldEH2R0zxExaDh5BBroNlwBXICmEHTjXv6FkmUS+OiNfznrB5tsRViMFmGAnKyZlnR BEyvRLDCU23frgjFcgmyaMmDnlQpQGheF22xMETg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Adrian Hunter , Jiri Olsa , Arnaldo Carvalho de Melo Subject: [PATCH 4.9 110/118] perf intel-pt: Fix overlap calculation for padding Date: Fri, 22 Mar 2019 12:16:22 +0100 Message-Id: <20190322111224.077787706@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190322111215.873964544@linuxfoundation.org> References: <20190322111215.873964544@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Adrian Hunter commit 5a99d99e3310a565b0cf63f785b347be9ee0da45 upstream. Auxtrace records might have up to 7 bytes of padding appended. Adjust the overlap accordingly. Signed-off-by: Adrian Hunter Cc: Jiri Olsa Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20190206103947.15750-3-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Greg Kroah-Hartman --- tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 36 ++++++++++++++++++-- 1 file changed, 34 insertions(+), 2 deletions(-) --- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c @@ -26,6 +26,7 @@ #include "../cache.h" #include "../util.h" +#include "../auxtrace.h" #include "intel-pt-insn-decoder.h" #include "intel-pt-pkt-decoder.h" @@ -2350,6 +2351,34 @@ static int intel_pt_tsc_cmp(uint64_t tsc } } +#define MAX_PADDING (PERF_AUXTRACE_RECORD_ALIGNMENT - 1) + +/** + * adj_for_padding - adjust overlap to account for padding. + * @buf_b: second buffer + * @buf_a: first buffer + * @len_a: size of first buffer + * + * @buf_a might have up to 7 bytes of padding appended. Adjust the overlap + * accordingly. + * + * Return: A pointer into @buf_b from where non-overlapped data starts + */ +static unsigned char *adj_for_padding(unsigned char *buf_b, + unsigned char *buf_a, size_t len_a) +{ + unsigned char *p = buf_b - MAX_PADDING; + unsigned char *q = buf_a + len_a - MAX_PADDING; + int i; + + for (i = MAX_PADDING; i; i--, p++, q++) { + if (*p != *q) + break; + } + + return p; +} + /** * intel_pt_find_overlap_tsc - determine start of non-overlapped trace data * using TSC. @@ -2400,8 +2429,11 @@ static unsigned char *intel_pt_find_over /* Same TSC, so buffers are consecutive */ if (!cmp && rem_b >= rem_a) { + unsigned char *start; + *consecutive = true; - return buf_b + len_b - (rem_b - rem_a); + start = buf_b + len_b - (rem_b - rem_a); + return adj_for_padding(start, buf_a, len_a); } if (cmp < 0) return buf_b; /* tsc_a < tsc_b => no overlap */ @@ -2464,7 +2496,7 @@ unsigned char *intel_pt_find_overlap(uns found = memmem(buf_a, len_a, buf_b, len_a); if (found) { *consecutive = true; - return buf_b + len_a; + return adj_for_padding(buf_b + len_a, buf_a, len_a); } /* Try again at next PSB in buffer 'a' */