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=-17.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,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 9D9FFC433DB for ; Thu, 14 Jan 2021 02:10:05 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3D5522242A for ; Thu, 14 Jan 2021 02:10:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3D5522242A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Ih42kIr96G4mJX1rEXgXOcxQ+eimuTa1XTLqYc3AvbY=; b=DqD8rmLjdWOdn6m34F4RXiw7W WBTxuYrNVD3TyhZHLViZtOR8N9zilTpgb/+fVFSjKs4x63jANxgmseqjTTtYFh9IHfSNkC0LvtYHB jWNQssRZUTNc1P9Ar3dUk0QzskJttYaXoDEBy/pu2ZwvVMZH5nmHu0PB97G8jxsHH6MqDI2GChmFT 0HELjBdFe9wYA6BKiEtjevKx6hCxslLUpXTR+eDxjpQU44Z6jA+Nxpx6LfQ12M9BN21DUI8nhQ1H4 0RRTy5AGbGYULOSC4kmOl42zfC82n3AHtwgwg0/ogwvERmSVaBOe1Yo0lb+OreNw/NwPYYXLOoqio mrKzJOYWw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kzs2S-0001ur-15; Thu, 14 Jan 2021 02:07:04 +0000 Received: from mail-ot1-f47.google.com ([209.85.210.47]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kzs1k-0001eE-Mi for linux-arm-kernel@lists.infradead.org; Thu, 14 Jan 2021 02:06:29 +0000 Received: by mail-ot1-f47.google.com with SMTP id q25so3867845otn.10 for ; Wed, 13 Jan 2021 18:06:20 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Wig/HFFJZ8uHwd678r1QTGfrrN3jLk/yk6LwIbsml5o=; b=AcTeXKBbiu4Jk+VOJz4HfU3Gz8eV+g1OooEhHEFBlr/xqTci+WdGzn1X7Rm6uNrSkN 9bBlfuCs5C8huF0RcBzwHkKSlWkb4e2nYPD+LadWW5QQoOGuYpcEuQ3Ck3tW4gitjA/W XUBEyJneAgWkgP/tf1LhuwQmoYH+p+w2xDhO+N486nYb/VJ0zbXQ6/VN3ypvKGRFFFUV 0oO/Z7f3kq1IuNz7Io6cMxNz+xAUgiBKn/EDq7Lv8he0FoYgYDpTUvw3lHZpzz5bkq8i eca3uJuHMYbT1ejCsjUqaGRmBrVj5ZbDBVgQDOEuhchK52PSOFyDqzq/gzpYFKCH7szm 1slg== X-Gm-Message-State: AOAM532wJrfwIjnvf8b0GWTOEXuSfYp8uSjtzlO3+o/v/d0JRRUuK6pI U58lw6lAoyruvwe4qG/x5g== X-Google-Smtp-Source: ABdhPJwKkWesEat9fv9oqAhQroQIWzKuPe3E4bht9dSwX47mRMSswSPA2LglecWU0eb+CdW1g9RzHQ== X-Received: by 2002:a9d:69c1:: with SMTP id v1mr3274693oto.128.1610589980021; Wed, 13 Jan 2021 18:06:20 -0800 (PST) Received: from xps15.herring.priv (24-155-109-49.dyn.grandenetworks.net. [24.155.109.49]) by smtp.googlemail.com with ESMTPSA id x20sm814272oov.33.2021.01.13.18.06.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Jan 2021 18:06:19 -0800 (PST) From: Rob Herring To: Will Deacon , Catalin Marinas , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Jiri Olsa , Mark Rutland Subject: [PATCH v5 8/9] perf: arm64: Add test for userspace counter access on heterogeneous systems Date: Wed, 13 Jan 2021 20:06:04 -0600 Message-Id: <20210114020605.3943992-9-robh@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210114020605.3943992-1-robh@kernel.org> References: <20210114020605.3943992-1-robh@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210113_210620_962918_306C7369 X-CRM114-Status: GOOD ( 25.38 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ian Rogers , Alexander Shishkin , linux-kernel@vger.kernel.org, honnappa.nagarahalli@arm.com, Raphael Gault , Jonathan Cameron , Namhyung Kim , Itaru Kitayama , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Userspace counter access only works on heterogeneous systems with some restrictions. The userspace process must be pinned to a homogeneous subset of CPUs and must open the corresponding PMU for those CPUs. This commit adds a test implementing these requirements. Signed-off-by: Rob Herring --- v5: - Adapt to libperf mmap API changes v4: - Update perf_evsel__mmap params v2: - Drop all but heterogeneous test as others covered by libperf tests - Rework to use libperf --- tools/perf/arch/arm64/include/arch-tests.h | 7 + tools/perf/arch/arm64/tests/Build | 1 + tools/perf/arch/arm64/tests/arch-tests.c | 4 + tools/perf/arch/arm64/tests/user-events.c | 170 +++++++++++++++++++++ 4 files changed, 182 insertions(+) create mode 100644 tools/perf/arch/arm64/tests/user-events.c diff --git a/tools/perf/arch/arm64/include/arch-tests.h b/tools/perf/arch/arm64/include/arch-tests.h index 90ec4c8cb880..380ad34a3f09 100644 --- a/tools/perf/arch/arm64/include/arch-tests.h +++ b/tools/perf/arch/arm64/include/arch-tests.h @@ -2,11 +2,18 @@ #ifndef ARCH_TESTS_H #define ARCH_TESTS_H +#include + #ifdef HAVE_DWARF_UNWIND_SUPPORT struct thread; struct perf_sample; +int test__arch_unwind_sample(struct perf_sample *sample, + struct thread *thread); #endif extern struct test arch_tests[]; +int test__rd_pinned(struct test __maybe_unused *test, + int __maybe_unused subtest); + #endif diff --git a/tools/perf/arch/arm64/tests/Build b/tools/perf/arch/arm64/tests/Build index a61c06bdb757..3f9a20c17fc6 100644 --- a/tools/perf/arch/arm64/tests/Build +++ b/tools/perf/arch/arm64/tests/Build @@ -1,4 +1,5 @@ perf-y += regs_load.o perf-$(CONFIG_DWARF_UNWIND) += dwarf-unwind.o +perf-y += user-events.o perf-y += arch-tests.o diff --git a/tools/perf/arch/arm64/tests/arch-tests.c b/tools/perf/arch/arm64/tests/arch-tests.c index 5b1543c98022..80ce7bd3c16d 100644 --- a/tools/perf/arch/arm64/tests/arch-tests.c +++ b/tools/perf/arch/arm64/tests/arch-tests.c @@ -10,6 +10,10 @@ struct test arch_tests[] = { .func = test__dwarf_unwind, }, #endif + { + .desc = "Pinned CPU user counter access", + .func = test__rd_pinned, + }, { .func = NULL, }, diff --git a/tools/perf/arch/arm64/tests/user-events.c b/tools/perf/arch/arm64/tests/user-events.c new file mode 100644 index 000000000000..379d3f688cd7 --- /dev/null +++ b/tools/perf/arch/arm64/tests/user-events.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include + +#include +#include +#include + +#include "pmu.h" +#include "debug.h" +#include "tests/tests.h" +#include "arch-tests.h" + +static int run_test(struct perf_evsel *evsel) +{ + int n; + volatile int tmp = 0; + u64 delta, i, loops = 1000; + struct perf_counts_values counts = { .val = 0 }; + + for (n = 0; n < 6; n++) { + u64 stamp, now; + + perf_evsel__read(evsel, 0, 0, &counts); + stamp = counts.val; + + for (i = 0; i < loops; i++) + tmp++; + + perf_evsel__read(evsel, 0, 0, &counts); + now = counts.val; + loops *= 10; + + delta = now - stamp; + pr_debug("%14d: %14llu\n", n, (long long)delta); + + if (!delta) + break; + } + return delta ? 0 : -1; +} + +static struct perf_pmu *pmu_for_cpu(int cpu) +{ + int acpu, idx; + struct perf_pmu *pmu = NULL; + + while ((pmu = perf_pmu__scan(pmu)) != NULL) { + if (pmu->is_uncore) + continue; + perf_cpu_map__for_each_cpu(acpu, idx, pmu->cpus) + if (acpu == cpu) + return pmu; + } + return NULL; +} + +static bool pmu_is_homogeneous(void) +{ + int core_cnt = 0; + struct perf_pmu *pmu = NULL; + + while ((pmu = perf_pmu__scan(pmu)) != NULL) { + if (!pmu->is_uncore && !perf_cpu_map__empty(pmu->cpus)) + core_cnt++; + } + return core_cnt == 1; +} + +static int libperf_print(enum libperf_print_level level, + const char *fmt, va_list ap) +{ + (void)level; + return vfprintf(stderr, fmt, ap); +} + +static struct perf_evsel *perf_init(struct perf_event_attr *attr) +{ + int err; + struct perf_thread_map *threads; + struct perf_evsel *evsel; + + libperf_init(libperf_print); + + threads = perf_thread_map__new_dummy(); + if (!threads) { + pr_err("failed to create threads\n"); + return NULL; + } + + perf_thread_map__set_pid(threads, 0, 0); + + evsel = perf_evsel__new(attr); + if (!evsel) { + pr_err("failed to create evsel\n"); + goto out_thread; + } + + err = perf_evsel__open(evsel, NULL, threads); + if (err) { + pr_err("failed to open evsel\n"); + goto out_open; + } + + if (perf_evsel__mmap(evsel, 0)) { + pr_err("failed to mmap evsel\n"); + goto out_mmap; + } + + return evsel; + +out_mmap: + perf_evsel__close(evsel); +out_open: + perf_evsel__delete(evsel); +out_thread: + perf_thread_map__put(threads); + return NULL; +} + +int test__rd_pinned(struct test __maybe_unused *test, + int __maybe_unused subtest) +{ + int cpu, cputmp, ret = -1; + struct perf_evsel *evsel; + struct perf_event_attr attr = { + .config = 0x8, /* Instruction count */ + .config1 = 0, /* 32-bit counter */ + .exclude_kernel = 1, + }; + cpu_set_t cpu_set; + struct perf_pmu *pmu; + + if (pmu_is_homogeneous()) + return TEST_SKIP; + + cpu = sched_getcpu(); + pmu = pmu_for_cpu(cpu); + if (!pmu) + return -1; + attr.type = pmu->type; + + CPU_ZERO(&cpu_set); + perf_cpu_map__for_each_cpu(cpu, cputmp, pmu->cpus) + CPU_SET(cpu, &cpu_set); + if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) + pr_err("Could not set affinity\n"); + + evsel = perf_init(&attr); + if (!evsel) + return -1; + + perf_cpu_map__for_each_cpu(cpu, cputmp, pmu->cpus) { + CPU_ZERO(&cpu_set); + CPU_SET(cpu, &cpu_set); + if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) + pr_err("Could not set affinity\n"); + + pr_debug("Running on CPU %d\n", cpu); + + ret = run_test(evsel); + if (ret) + break; + } + + perf_evsel__close(evsel); + perf_evsel__delete(evsel); + return ret; +} -- 2.27.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel