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[2620:137:e000::1:20]) by mx.google.com with ESMTP id m3-20020a1709062ac300b006df76385edfsi13219309eje.895.2022.03.23.08.45.34; Wed, 23 Mar 2022 08:46:01 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20210112 header.b="FeK8lZX/"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238130AbiCVWRw (ORCPT + 99 others); Tue, 22 Mar 2022 18:17:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237801AbiCVWR3 (ORCPT ); Tue, 22 Mar 2022 18:17:29 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 12BC85370C for ; Tue, 22 Mar 2022 15:15:53 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 190-20020a2505c7000000b00629283fec72so15593011ybf.5 for ; Tue, 22 Mar 2022 15:15:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=2fFnNoJQ3H9hVlBp1UXUfdC5Kvmn9rISGKDSRRVelmI=; b=FeK8lZX/ROxlGZdXcfs3viVelDZve+bBs7HH6xjHv4eJzGcbkdJsHU3ntygvtCUVdv NkJDOEKDSVaTVVsIpTZvk2RI17GNfD/pBO6FMzyEfAAbKW81vTjR5OG4LDX28/UbGB7/ GwS0ShbbmF6ggSA0boU17tSlUhud+E45xsmvm2cLow8VusQXIHaREHjTh7IB91L018Kj 2l3o0VFKO2Nsot2yfkJ6lw7/CZXbVQeSRXc0FYiGtpKMxtpVSQgObgpjSNFtzlC+RA1A y5H4DxQtg+OLmsSv2AILaNhpYcEaomltUcM87D/LWfe6DNXBZ2T1iUBKz3sRh9N2mrmY tT2w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=2fFnNoJQ3H9hVlBp1UXUfdC5Kvmn9rISGKDSRRVelmI=; b=A7FV1NgXXvmLSJoBqEa3NWG2ZRz1y8J8iu4lNMQOZEr5UNPOSYyLB94HKen0r7GiXv 1ihEeOs5gGpVjw0gtZy5rh+7d8W3h8QZexCT6XPetFe00IAdecjfN66ADFPGpwGuSYta EoCDqvfFlUtMlG3LCV5Pbfqpbn/zjPEeU8S2ZyrBgf7kjVRaxnPboyPX2Jpa+jLNPwNe Fsw3f/949xDn/2EiO+jfBRXwyQvZAdGS8BHK5VmZ2PG3uLpsxZmC0MzX/rWaDDs4tRmJ k7pNWCBZPrgFk7EM3Zd+5F0ZoQnt/6iyQna694FOPt5lBVl+qs3huBa4/TgncUsOGxPs eAbw== X-Gm-Message-State: AOAM5321/Kfn71b4OejGjQElFXZR6GowXZ7cXUlWo3c/wLpS+d5Zb+yz wK4d83TUq+aeoGCgHj9bzmoiYMpCYAg0DuwrsjVKBQpL/vCNPfNTPbXwxQcEGmIi81DELVWSgeI NCLE9/QH4cW2R7Y63W6Vj5v56WQerBK+el7QUED+OqPRDR17tc+ic+3wx8O+MVtxakFAuyLWf X-Received: from uluru3.svl.corp.google.com ([2620:15c:2cd:202:1817:acc9:c45f:d133]) (user=eranian job=sendgmr) by 2002:a25:3246:0:b0:633:af97:a3eb with SMTP id y67-20020a253246000000b00633af97a3ebmr25789591yby.274.1647987352324; Tue, 22 Mar 2022 15:15:52 -0700 (PDT) Date: Tue, 22 Mar 2022 15:15:15 -0700 In-Reply-To: <20220322221517.2510440-1-eranian@google.com> Message-Id: <20220322221517.2510440-12-eranian@google.com> Mime-Version: 1.0 References: <20220322221517.2510440-1-eranian@google.com> X-Mailer: git-send-email 2.35.1.894.gb6a874cedc-goog Subject: [PATCH v7 11/13] perf tools: Improve IBS error handling From: Stephane Eranian To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, kim.phillips@amd.com, acme@redhat.com, jolsa@redhat.com, songliubraving@fb.com, rafael@kernel.org, ravi.bangoria@amd.com, sandipan.das@amd.com Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kim Phillips improve the error message returned on failed perf_event_open() on AMD when using IBS. Output of executing 'perf record -e ibs_op// true' BEFORE this patch: The sys_perf_event_open() syscall returned with 22 (Invalid argument)for event (ibs_op//u). /bin/dmesg | grep -i perf may provide additional information. Output after: AMD IBS cannot exclude kernel events. Try running at a higher privilege level. Output of executing 'sudo perf record -e ibs_op// true' BEFORE this patch: Error: The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (ibs_op//). /bin/dmesg | grep -i perf may provide additional information. Output after: Error: AMD IBS may only be available in system-wide/per-cpu mode. Try using -a, or -C and workload affinity Signed-off-by: Kim Phillips Cc: Arnaldo Carvalho de Melo Cc: Alexander Shishkin Cc: Boris Ostrovsky Cc: Ian Rogers Cc: Ingo Molnar Cc: Jiri Olsa Cc: Joao Martins Cc: Konrad Rzeszutek Wilk Cc: Mark Rutland Cc: Michael Petlan Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Robert Richter Cc: Stephane Eranian --- tools/perf/util/evsel.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 14b0e7ffa2c7..e8ff7a4bd490 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -2847,9 +2847,23 @@ static bool find_process(const char *name) return ret ? false : true; } +static bool is_amd(const char *arch, const char *cpuid) +{ + return arch && !strcmp("x86", arch) && cpuid && strstarts(cpuid, "AuthenticAMD"); +} + +static bool is_amd_ibs(struct evsel *evsel) +{ + return evsel->core.attr.precise_ip + || (evsel->pmu_name && !strncmp(evsel->pmu_name, "ibs", 3)); +} + int evsel__open_strerror(struct evsel *evsel, struct target *target, int err, char *msg, size_t size) { + struct perf_env *env = evsel__env(evsel); + const char *arch = perf_env__arch(env); + const char *cpuid = perf_env__cpuid(env); char sbuf[STRERR_BUFSIZE]; int printed = 0, enforced = 0; @@ -2949,6 +2963,17 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target, return scnprintf(msg, size, "Invalid event (%s) in per-thread mode, enable system wide with '-a'.", evsel__name(evsel)); + if (is_amd(arch, cpuid)) { + if (is_amd_ibs(evsel)) { + if (evsel->core.attr.exclude_kernel) + return scnprintf(msg, size, + "AMD IBS can't exclude kernel events. Try running at a higher privilege level."); + if (!evsel->core.system_wide) + return scnprintf(msg, size, + "AMD IBS may only be available in system-wide/per-cpu mode. Try using -a, or -C and workload affinity"); + } + } + break; case ENODATA: return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. " -- 2.35.1.894.gb6a874cedc-goog