From patchwork Thu Aug 20 09:20:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 265416 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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 41EEAC433E1 for ; Thu, 20 Aug 2020 12:39:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 15ED3207DA for ; Thu, 20 Aug 2020 12:39:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597927179; bh=kCwqB6Ovaix4fstCjpwfhLC6Ms9iQESqD6AeWDno2wU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2rr8hRTFoqsEjKNSLNizZSJg5KF5kSFT14D8l/9mT1svVagVagKXtvutc6CcDyg4g aRHG3Va0qmIX75uH1jX8QsUYGLmkYg6mAu6iPRQIXliz7MbciGjx4/6JRoMr81G3of rK2FUdzyjW8A2GKaf/ZzXaWSpYg+MuixcYMhTWzo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729580AbgHTMjf (ORCPT ); Thu, 20 Aug 2020 08:39:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:51482 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729470AbgHTJrf (ORCPT ); Thu, 20 Aug 2020 05:47:35 -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 D866C20724; Thu, 20 Aug 2020 09:47:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597916854; bh=kCwqB6Ovaix4fstCjpwfhLC6Ms9iQESqD6AeWDno2wU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kOG+2ZaVViPvwwHxRGd9DPfaj6CNl+CkEcJNBn3sO0EzZNqNWnJU/adBOT3BYqdCZ z4JKMvaWiDlwMPCfSfg1cP9Np5t9hNOdoX4UTc1SL2zkHrVtLCwFleWDLfvcnAgM7A 0MZs/OM5vX0xncqJnIzTsHZ+YMQeEHoXiCU7BQwk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Adrian Hunter , Andi Kleen , Jiri Olsa , Arnaldo Carvalho de Melo Subject: [PATCH 5.4 069/152] perf intel-pt: Fix FUP packet state Date: Thu, 20 Aug 2020 11:20:36 +0200 Message-Id: <20200820091557.262157715@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091553.615456912@linuxfoundation.org> References: <20200820091553.615456912@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Adrian Hunter commit 401136bb084fd021acd9f8c51b52fe0a25e326b2 upstream. While walking code towards a FUP ip, the packet state is INTEL_PT_STATE_FUP or INTEL_PT_STATE_FUP_NO_TIP. That was mishandled resulting in the state becoming INTEL_PT_STATE_IN_SYNC prematurely. The result was an occasional lost EXSTOP event. Signed-off-by: Adrian Hunter Reviewed-by: Andi Kleen Cc: Jiri Olsa Cc: stable@vger.kernel.org Link: http://lore.kernel.org/lkml/20200710151104.15137-2-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 | 21 ++++++-------------- 1 file changed, 7 insertions(+), 14 deletions(-) --- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c @@ -1164,6 +1164,7 @@ static int intel_pt_walk_fup(struct inte return 0; if (err == -EAGAIN || intel_pt_fup_with_nlip(decoder, &intel_pt_insn, ip, err)) { + decoder->pkt_state = INTEL_PT_STATE_IN_SYNC; if (intel_pt_fup_event(decoder)) return 0; return -EAGAIN; @@ -1942,17 +1943,13 @@ next: } if (decoder->set_fup_mwait) no_tip = true; + if (no_tip) + decoder->pkt_state = INTEL_PT_STATE_FUP_NO_TIP; + else + decoder->pkt_state = INTEL_PT_STATE_FUP; err = intel_pt_walk_fup(decoder); - if (err != -EAGAIN) { - if (err) - return err; - if (no_tip) - decoder->pkt_state = - INTEL_PT_STATE_FUP_NO_TIP; - else - decoder->pkt_state = INTEL_PT_STATE_FUP; - return 0; - } + if (err != -EAGAIN) + return err; if (no_tip) { no_tip = false; break; @@ -2599,15 +2596,11 @@ const struct intel_pt_state *intel_pt_de err = intel_pt_walk_tip(decoder); break; case INTEL_PT_STATE_FUP: - decoder->pkt_state = INTEL_PT_STATE_IN_SYNC; err = intel_pt_walk_fup(decoder); if (err == -EAGAIN) err = intel_pt_walk_fup_tip(decoder); - else if (!err) - decoder->pkt_state = INTEL_PT_STATE_FUP; break; case INTEL_PT_STATE_FUP_NO_TIP: - decoder->pkt_state = INTEL_PT_STATE_IN_SYNC; err = intel_pt_walk_fup(decoder); if (err == -EAGAIN) err = intel_pt_walk_trace(decoder);