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 picard.linux.it (picard.linux.it [213.254.12.146]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 43FB3CD3427 for ; Thu, 7 May 2026 11:13:34 +0000 (UTC) Received: from picard.linux.it (localhost [IPv6:::1]) by picard.linux.it (Postfix) with ESMTP id 353133E5F71 for ; Thu, 7 May 2026 13:13:32 +0200 (CEST) Received: from in-2.smtp.seeweb.it (in-2.smtp.seeweb.it [217.194.8.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by picard.linux.it (Postfix) with ESMTPS id 603323E24B3 for ; Thu, 7 May 2026 13:13:12 +0200 (CEST) Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by in-2.smtp.seeweb.it (Postfix) with ESMTPS id A6FDE60034E for ; Thu, 7 May 2026 13:13:09 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1778152391; x=1809688391; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=1vDRegzmSfNBj2bjtlzS3Y/64PZ/IC5eUEbeMf6PvHM=; b=h+dCVo8Suuo74JGVE4PHiBvSxXhJAwPcw3KBqymoeGF6iCiO2/6J4uqE 3ML2OcBWvS4hC/7iwxQXJagzR/+V7XjSmelatfSgUrSYKgGyWbwZm76OW InnVK9e7ZyOBztwJcpZsgdWvAFW0eXfXE0qqdGfb7P/mM9TZW/YlmHKyW H231wrXh7e2133QxAPezAGAJ+Pn2mHh7SznXPQV/jXS7l6TLnTTJ42njX mFr3D4OFSSeeLCf5Y+YHbgZw/o+vH7PtOZjKKULErhQbp/0pEcFFB6tNj c5dd4bpqbuWkJMIwLx376KP5k9qY0jx1gr+FNEZETUozKYdEcy21fNKIf A==; X-CSE-ConnectionGUID: 1tlDaS6KS1y26kmojXkPcw== X-CSE-MsgGUID: HpacuXrNSP6h8wr4F4hVHg== X-IronPort-AV: E=McAfee;i="6800,10657,11778"; a="90200957" X-IronPort-AV: E=Sophos;i="6.23,221,1770624000"; d="scan'208";a="90200957" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2026 04:13:07 -0700 X-CSE-ConnectionGUID: 069x9SDkQS+QLVQSQMwGaA== X-CSE-MsgGUID: zUJtHSIbQB2eWF34PJxoTg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,221,1770624000"; d="scan'208";a="233770239" Received: from pkubaj-desk.igk.intel.com (HELO intel.com) ([10.217.160.221]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2026 04:13:05 -0700 From: Piotr Kubaj To: ltp@lists.linux.it Date: Thu, 7 May 2026 13:11:46 +0200 Message-ID: <20260507111145.112276-2-piotr.kubaj@intel.com> X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 X-Virus-Scanned: clamav-milter 1.0.9 at in-2.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH v8] cpufreq.c: add new test for cpufreq sysfs interface validation X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: helena.anna.dubel@intel.com, tomasz.ossowski@intel.com, rafael.j.wysocki@intel.com, daniel.niestepski@intel.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Runs various sanity checks for intel_pstate cpufreq sysfs interface. Checks whether intel_pstate driver is used, whether it is possible to switch scaling_governor to powersave and performance, whether it is possible to disable turbo frequency and whether it is possible to change scaling_min_freq and scaling_max_freq to its minimal valid and maximal valid values. Requires root to write to /sys/devices/system/cpu/intel_pstate/ (status, no_turbo) and per-CPU /sys/devices/system/cpu/cpu*\/cpufreq/ attributes (scaling_governor, scaling_min_freq, scaling_max_freq). Motivation: LTP has no regression coverage for the intel_pstate cpufreq sysfs interface, so breakage in any of these attributes (driver exposure, governor switching, active/passive mode transitions, no_turbo toggling or scaling_{min,max}_freq writes) can reach users undetected. This test exercises the interface end-to-end to catch such regressions. Signed-off-by: Piotr Kubaj --- Address further review: 1. better commit message. 2. drop SAFE_READ(). 3. reset setup_done. runtest/power_management_tests | 1 + testcases/kernel/power_management/.gitignore | 1 + testcases/kernel/power_management/cpufreq.c | 410 +++++++++++++++++++ 3 files changed, 412 insertions(+) create mode 100644 testcases/kernel/power_management/.gitignore create mode 100644 testcases/kernel/power_management/cpufreq.c diff --git a/runtest/power_management_tests b/runtest/power_management_tests index b670da6ec..0bc7dd0c8 100644 --- a/runtest/power_management_tests +++ b/runtest/power_management_tests @@ -1,4 +1,5 @@ #POWER_MANAGEMENT +cpufreq cpufreq runpwtests03 runpwtests03.sh runpwtests04 runpwtests04.sh runpwtests06 runpwtests06.sh diff --git a/testcases/kernel/power_management/.gitignore b/testcases/kernel/power_management/.gitignore new file mode 100644 index 000000000..7f34e4c2f --- /dev/null +++ b/testcases/kernel/power_management/.gitignore @@ -0,0 +1 @@ +cpufreq diff --git a/testcases/kernel/power_management/cpufreq.c b/testcases/kernel/power_management/cpufreq.c new file mode 100644 index 000000000..d157006ba --- /dev/null +++ b/testcases/kernel/power_management/cpufreq.c @@ -0,0 +1,410 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2026 Piotr Kubaj + */ + +/*\ + * Runs various sanity checks for intel_pstate cpufreq sysfs interface. + * + * Checks whether intel_pstate driver is used, whether it is possible to switch + * scaling_governor to powersave and performance, whether it is possible + * to disable turbo frequency and whether it is possible to change + * scaling_min_freq and scaling_max_freq to its minimal valid and maximal valid + * values. + * + * Requires root to write to /sys/devices/system/cpu/intel_pstate/ (status, + * no_turbo) and per-CPU /sys/devices/system/cpu/cpu*\/cpufreq/ attributes + * (scaling_governor, scaling_min_freq, scaling_max_freq). + * + * Motivation: LTP has no regression coverage for the intel_pstate cpufreq + * sysfs interface, so breakage in any of these attributes (driver exposure, + * governor switching, active/passive mode transitions, no_turbo toggling or + * scaling_{min,max}_freq writes) can reach users undetected. This test + * exercises the interface end-to-end to catch such regressions. + */ + +#include "tst_test.h" + +static bool *online; +static bool setup_done; +static char intel_pstate_status[16]; +static char (*previous_scaling_governor)[16]; +static int no_turbo, nproc; +static long *previous_scaling_max_freq, *previous_scaling_min_freq; + +static void cleanup(void) +{ + char path[PATH_MAX]; + + if (!setup_done) { + free(online); + free(previous_scaling_max_freq); + free(previous_scaling_min_freq); + free(previous_scaling_governor); + return; + } + + SAFE_FILE_PRINTF("/sys/devices/system/cpu/intel_pstate/status", "%s", intel_pstate_status); + SAFE_FILE_PRINTF("/sys/devices/system/cpu/intel_pstate/no_turbo", "%d", no_turbo); + + for (int i = 0; i < nproc; i++) { + if (!online[i]) + continue; + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", i); + SAFE_FILE_PRINTF(path, "%s", previous_scaling_governor[i]); + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", i); + SAFE_FILE_PRINTF(path, "%ld", previous_scaling_max_freq[i]); + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", i); + SAFE_FILE_PRINTF(path, "%ld", previous_scaling_min_freq[i]); + } + + free(online); + free(previous_scaling_max_freq); + free(previous_scaling_min_freq); + free(previous_scaling_governor); + setup_done = false; +} + +static void setup(void) +{ + char path[PATH_MAX]; + + if (access("/sys/devices/system/cpu/intel_pstate/status", F_OK) == -1) + tst_brk(TCONF, "intel_pstate driver not active"); + + SAFE_FILE_SCANF("/sys/devices/system/cpu/intel_pstate/no_turbo", "%d", &no_turbo); + SAFE_FILE_SCANF("/sys/devices/system/cpu/intel_pstate/status", "%15s", intel_pstate_status); + + nproc = tst_ncpus_conf(); + online = SAFE_CALLOC(nproc, sizeof(*online)); + previous_scaling_max_freq = SAFE_CALLOC(nproc, sizeof(*previous_scaling_max_freq)); + previous_scaling_min_freq = SAFE_CALLOC(nproc, sizeof(*previous_scaling_min_freq)); + previous_scaling_governor = SAFE_CALLOC(nproc, sizeof(*previous_scaling_governor)); + online[0] = true; + for (int i = 1; i < nproc; i++) { + int tmp; + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/online", i); + SAFE_FILE_SCANF(path, "%d", &tmp); + online[i] = (bool)tmp; + } + for (int i = 0; i < nproc; i++) { + if (!online[i]) + continue; + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", i); + SAFE_FILE_SCANF(path, "%15s", previous_scaling_governor[i]); + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", i); + SAFE_FILE_SCANF(path, "%ld", &previous_scaling_max_freq[i]); + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", i); + SAFE_FILE_SCANF(path, "%ld", &previous_scaling_min_freq[i]); + } + + SAFE_FILE_PRINTF("/sys/devices/system/cpu/intel_pstate/status", "active"); + + setup_done = true; +} + +static void run(void) +{ + const char * const cpufreq_nodes[] = { + "affected_cpus", + "cpuinfo_max_freq", + "cpuinfo_min_freq", + "cpuinfo_transition_latency", + "related_cpus", + "scaling_available_governors", + "scaling_cur_freq", + "scaling_driver", + "scaling_governor", + "scaling_max_freq", + "scaling_min_freq", + "scaling_setspeed", + NULL + }; + char contents[256] = {0}, path[PATH_MAX], path_cpuinfo_min_freq[PATH_MAX]; + int no_turbo_val; + long cpuinfo_max_freq = 0, cpuinfo_min_freq = 0, scaling_max_freq, scaling_min_freq; + + for (int i = 0; i < nproc; i++) { + if (!online[i]) + continue; + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_driver", i); + + SAFE_FILE_SCANF(path, "%255s", contents); + tst_res(TDEBUG, "Checking whether %s is \"intel_pstate\"", path); + if (strstr(contents, "intel_pstate")) { + tst_res(TPASS, "%s is intel_pstate", path); + } else { + tst_res(TINFO, "%s contains: %s", path, contents); + tst_res(TFAIL, "%s is not intel_pstate", path); + } + + for (int j = 0; cpufreq_nodes[j]; j++) { + struct stat stats; + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/%s", i, cpufreq_nodes[j]); + tst_res(TDEBUG, "Checking whether %s is a regular file", path); + SAFE_STAT(path, &stats); + if (!S_ISREG(stats.st_mode)) { + tst_res(TINFO, "%s mode: %o", path, stats.st_mode); + tst_res(TFAIL, "%s is not a regular file", path); + } else { + tst_res(TPASS, "%s is a regular file", path); + } + } + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_available_governors", i); + memset(contents, 0, sizeof(contents)); + SAFE_FILE_SCANF(path, "%255[^\n]", contents); + + tst_res(TDEBUG, "Checking whether %s contains \"performance\" and \"powersave\"", path); + if (strstr(contents, "performance") && strstr(contents, "powersave")) { + tst_res(TPASS, "%s contains: %s", path, contents); + } else { + tst_res(TINFO, "%s contains: %s", path, contents); + tst_res(TFAIL, "%s is not \"performance powersave\"", path); + } + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", i); + tst_res(TDEBUG, "Checking %s", path); + memset(contents, 0, sizeof(contents)); + SAFE_FILE_SCANF(path, "%255s", contents); + if (strstr(contents, "performance")) { + tst_res(TDEBUG, "%s is \"performance\"", path); + tst_res(TDEBUG, "Checking whether %s can be switched to \"powersave\"", path); + SAFE_FILE_PRINTF(path, "powersave"); + memset(contents, 0, sizeof(contents)); + SAFE_FILE_SCANF(path, "%255s", contents); + if (strstr(contents, "powersave")) + tst_res(TPASS, "Changing scaling_governor from performance to powersave succeeded"); + else + tst_res(TFAIL, "%s: failed to change scaling_governor from performance to powersave, current scaling_governor: %s", path, contents); + + } else if (strstr(contents, "powersave")) { + tst_res(TDEBUG, "%s is \"powersave\"", path); + tst_res(TDEBUG, "Checking whether %s can be switched to \"performance\"", path); + SAFE_FILE_PRINTF(path, "performance"); + memset(contents, 0, sizeof(contents)); + SAFE_FILE_SCANF(path, "%255s", contents); + if (strstr(contents, "performance")) + tst_res(TPASS, "Changing scaling_governor from powersave to performance succeeded"); + else + tst_res(TFAIL, "%s: failed to change scaling_governor from powersave to performance, current scaling_governor: %s", path, contents); + + } else { + tst_brk(TBROK, "Unknown scaling_governor: %s", contents); + } + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", i); + snprintf(path_cpuinfo_min_freq, sizeof(path_cpuinfo_min_freq), "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_min_freq", i); + tst_res(TDEBUG, "Checking whether %s is bigger than cpuinfo_min_freq", path); + SAFE_FILE_SCANF(path, "%ld", &cpuinfo_max_freq); + + SAFE_FILE_SCANF(path_cpuinfo_min_freq, "%ld", &cpuinfo_min_freq); + + if (cpuinfo_min_freq > cpuinfo_max_freq) + tst_res(TFAIL, "Value in %s: %ld, should be bigger than cpuinfo_min_freq: %ld", path, cpuinfo_max_freq, cpuinfo_min_freq); + else + tst_res(TPASS, "Value in %s: %ld, is bigger than cpuinfo_min_freq: %ld", path, cpuinfo_max_freq, cpuinfo_min_freq); + } + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/intel_pstate/status"); + tst_res(TDEBUG, "Checking whether %s contains \"active\"", path); + memset(contents, 0, sizeof(contents)); + SAFE_FILE_SCANF(path, "%255s", contents); + + if (strstr(contents, "active")) + tst_res(TPASS, "%s is \"active\"", path); + else + tst_res(TFAIL, "%s is not \"active\", but %s", path, contents); + + tst_res(TDEBUG, "Checking whether %s can be switched to \"passive\"", path); + SAFE_FILE_PRINTF(path, "passive"); + memset(contents, 0, sizeof(contents)); + SAFE_FILE_SCANF(path, "%255s", contents); + + if (strstr(contents, "passive")) + tst_res(TPASS, "%s is \"passive\"", path); + else + tst_res(TFAIL, "%s is not \"passive\", but %s", path, contents); + + tst_res(TDEBUG, "Checking whether %s can be switched back to \"active\"", path); + SAFE_FILE_PRINTF(path, "active"); + memset(contents, 0, sizeof(contents)); + SAFE_FILE_SCANF(path, "%255s", contents); + + if (strstr(contents, "active")) + tst_res(TPASS, "%s is \"active\"", path); + else + tst_res(TFAIL, "%s is not \"active\", but %s", path, contents); + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/intel_pstate/no_turbo"); + tst_res(TDEBUG, "Checking whether %s can be switched to 1", path); + SAFE_FILE_PRINTF(path, "1"); + SAFE_FILE_SCANF(path, "%d", &no_turbo_val); + + if (no_turbo_val == 1) + tst_res(TPASS, "%s is \"1\"", path); + else + tst_res(TFAIL, "%s is not \"1\", but %d", path, no_turbo_val); + + tst_res(TDEBUG, "Checking whether %s can be switched back to 0", path); + SAFE_FILE_PRINTF(path, "0"); + SAFE_FILE_SCANF(path, "%d", &no_turbo_val); + + if (no_turbo_val == 0) + tst_res(TPASS, "%s is \"0\"", path); + else + tst_res(TFAIL, "%s is not \"0\", but %d", path, no_turbo_val); + + tst_res(TDEBUG, "Checking whether scaling_available_governors contains \"performance\" and \"schedutil\" after switching /sys/devices/system/cpu/intel_pstate/status to \"passive\""); + snprintf(path, sizeof(path), "/sys/devices/system/cpu/intel_pstate/status"); + SAFE_FILE_PRINTF(path, "passive"); + + for (int i = 0; i < nproc; i++) { + if (!online[i]) + continue; + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_available_governors", i); + memset(contents, 0, sizeof(contents)); + SAFE_FILE_SCANF(path, "%255[^\n]", contents); + + tst_res(TDEBUG, "Checking whether %s contains \"performance\" and \"schedutil\"", path); + if (strstr(contents, "performance") && strstr(contents, "schedutil")) { + tst_res(TPASS, "%s contains: %s", path, contents); + } else { + tst_res(TINFO, "%s contains: %s", path, contents); + tst_res(TFAIL, "%s does not contain \"performance\" and \"schedutil\"", path); + } + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", i); + tst_res(TDEBUG, "Checking whether %s can be changed to performance", path); + SAFE_FILE_PRINTF(path, "performance"); + memset(contents, 0, sizeof(contents)); + SAFE_FILE_SCANF(path, "%255s", contents); + + if (strstr(contents, "performance")) + tst_res(TPASS, "%s is \"performance\"", path); + else + tst_res(TFAIL, "%s is not \"performance\", but %s", path, contents); + + tst_res(TDEBUG, "Checking whether %s can be changed to schedutil", path); + SAFE_FILE_PRINTF(path, "schedutil"); + memset(contents, 0, sizeof(contents)); + SAFE_FILE_SCANF(path, "%255s", contents); + + if (strstr(contents, "schedutil")) + tst_res(TPASS, "%s is \"schedutil\"", path); + else + tst_res(TFAIL, "%s is not \"schedutil\", but %s", path, contents); + } + + for (int i = 0; i < nproc; i++) { + if (!online[i]) + continue; + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", i); + tst_res(TDEBUG, "Checking whether %s can be assigned to scaling_max_freq and scaling_min_freq", path); + SAFE_FILE_SCANF(path, "%ld", &cpuinfo_max_freq); + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_min_freq", i); + SAFE_FILE_SCANF(path, "%ld", &cpuinfo_min_freq); + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", i); + SAFE_FILE_PRINTF(path, "%ld", cpuinfo_max_freq); + SAFE_FILE_SCANF(path, "%ld", &scaling_max_freq); + + if (cpuinfo_max_freq < scaling_max_freq) { + tst_res(TINFO, "cpuinfo_max_freq: %ld", cpuinfo_max_freq); + tst_res(TINFO, "scaling_max_freq: %ld", scaling_max_freq); + tst_res(TFAIL, "Failure setting %s", path); + } else { + tst_res(TPASS, "Successfully set up %s", path); + } + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", i); + SAFE_FILE_PRINTF(path, "%ld", cpuinfo_max_freq); + SAFE_FILE_SCANF(path, "%ld", &scaling_min_freq); + + if (cpuinfo_max_freq < scaling_min_freq) { + tst_res(TINFO, "cpuinfo_max_freq: %ld", cpuinfo_max_freq); + tst_res(TINFO, "scaling_min_freq: %ld", scaling_min_freq); + tst_res(TFAIL, "Failure setting %s", path); + } else { + tst_res(TPASS, "Successfully set up %s", path); + } + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", i); + SAFE_FILE_PRINTF(path, "%ld", previous_scaling_min_freq[i]); + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", i); + SAFE_FILE_PRINTF(path, "%ld", previous_scaling_max_freq[i]); + } + + for (int i = 0; i < nproc; i++) { + if (!online[i]) + continue; + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", i); + tst_res(TDEBUG, "Checking whether %s can be assigned to scaling_max_freq and scaling_min_freq", path); + SAFE_FILE_SCANF(path, "%ld", &cpuinfo_max_freq); + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_min_freq", i); + SAFE_FILE_SCANF(path, "%ld", &cpuinfo_min_freq); + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", i); + SAFE_FILE_PRINTF(path, "%ld", cpuinfo_min_freq); + SAFE_FILE_SCANF(path, "%ld", &scaling_min_freq); + + if (cpuinfo_min_freq > scaling_min_freq) { + tst_res(TINFO, "cpuinfo_min_freq: %ld", cpuinfo_min_freq); + tst_res(TINFO, "scaling_min_freq: %ld", scaling_min_freq); + tst_res(TFAIL, "Failure setting %s", path); + } else { + tst_res(TPASS, "Successfully set up %s", path); + } + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", i); + SAFE_FILE_PRINTF(path, "%ld", cpuinfo_min_freq); + SAFE_FILE_SCANF(path, "%ld", &scaling_max_freq); + + if (cpuinfo_min_freq > scaling_max_freq) { + tst_res(TINFO, "cpuinfo_min_freq: %ld", cpuinfo_min_freq); + tst_res(TINFO, "scaling_max_freq: %ld", scaling_max_freq); + tst_res(TFAIL, "Failure setting %s", path); + } else { + tst_res(TPASS, "Successfully set up %s", path); + } + } + + SAFE_FILE_PRINTF("/sys/devices/system/cpu/intel_pstate/status", "active"); + + for (int i = 0; i < nproc; i++) { + if (!online[i]) + continue; + + snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", i); + SAFE_FILE_PRINTF(path, "%s", previous_scaling_governor[i]); + } +} + +static struct tst_test test = { + .cleanup = cleanup, + .needs_kconfigs = (const char *const []) { + "CONFIG_X86_INTEL_PSTATE", + NULL + }, + .needs_root = 1, + .setup = setup, + .supported_archs = (const char *const []) { + "x86", + "x86_64", + NULL + }, + .test_all = run +}; -- 2.47.3 --------------------------------------------------------------------- Intel Technology Poland sp. z o.o. ul. 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