From patchwork Thu Oct 29 19:02:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Borislav Petkov X-Patchwork-Id: 11867131 X-Patchwork-Delegate: lenb@kernel.org Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 83957921 for ; Thu, 29 Oct 2020 19:03:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 591542087E for ; Thu, 29 Oct 2020 19:03:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="fPZYB9s2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726127AbgJ2TDW (ORCPT ); Thu, 29 Oct 2020 15:03:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51684 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725783AbgJ2TDM (ORCPT ); Thu, 29 Oct 2020 15:03:12 -0400 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A7515C0613CF; Thu, 29 Oct 2020 12:03:12 -0700 (PDT) Received: from zn.tnic (p200300ec2f0ce9003d743c4902fedd6b.dip0.t-ipconnect.de [IPv6:2003:ec:2f0c:e900:3d74:3c49:2fe:dd6b]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 265051EC04DB; Thu, 29 Oct 2020 20:03:11 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1603998191; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4QHsxbopA1jJrvw6XXL20mjzFqcvCsIi7OxZFfD0NeQ=; b=fPZYB9s2yGieqy7whe3WSbzOB5vsdFZrWb2rgvfjOtAr6oJf5TCNvAzLwV4lYI0LDTnqto SV7lTduA+3bpcDJu7o6yBNpogKdMm+tHBP4BKrx4jPDW0bmuuTiPywmDfi3hRIAp4lXVMI 9fPPnxvJbk4rTTcUZdfU5olipuOPUO0= From: Borislav Petkov To: X86 ML Cc: Thomas Renninger , Shuah Khan , Len Brown , linux-pm@vger.kernel.org, LKML Subject: [PATCH v1 2/4] tools/power/turbostat: Read energy_perf_bias from sysfs Date: Thu, 29 Oct 2020 20:02:57 +0100 Message-Id: <20201029190259.3476-3-bp@alien8.de> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20201029190259.3476-1-bp@alien8.de> References: <20201029190259.3476-1-bp@alien8.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Borislav Petkov ... instead of poking at the MSR directly. Signed-off-by: Borislav Petkov Cc: Len Brown Cc: linux-pm@vger.kernel.org --- tools/power/x86/turbostat/turbostat.c | 29 ++++++++++++++++++++++----- 1 file changed, 24 insertions(+), 5 deletions(-) diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c index 33b370865d16..0baec7ea1bbd 100644 --- a/tools/power/x86/turbostat/turbostat.c +++ b/tools/power/x86/turbostat/turbostat.c @@ -1721,6 +1721,25 @@ int get_mp(int cpu, struct msr_counter *mp, unsigned long long *counterp) return 0; } +int get_epb(int cpu) +{ + char path[128 + PATH_BYTES]; + int ret, epb = -1; + FILE *fp; + + sprintf(path, "/sys/devices/system/cpu/cpu%d/power/energy_perf_bias", cpu); + + fp = fopen_or_die(path, "r"); + + ret = fscanf(fp, "%d", &epb); + if (ret != 1) + err(1, "%s(%s)", __func__, path); + + fclose(fp); + + return epb; +} + void get_apic_id(struct thread_data *t) { unsigned int eax, ebx, ecx, edx; @@ -3631,9 +3650,8 @@ dump_sysfs_pstate_config(void) */ int print_epb(struct thread_data *t, struct core_data *c, struct pkg_data *p) { - unsigned long long msr; char *epb_string; - int cpu; + int cpu, epb; if (!has_epb) return 0; @@ -3649,10 +3667,11 @@ int print_epb(struct thread_data *t, struct core_data *c, struct pkg_data *p) return -1; } - if (get_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS, &msr)) + epb = get_epb(cpu); + if (epb < 0) return 0; - switch (msr & 0xF) { + switch (epb) { case ENERGY_PERF_BIAS_PERFORMANCE: epb_string = "performance"; break; @@ -3666,7 +3685,7 @@ int print_epb(struct thread_data *t, struct core_data *c, struct pkg_data *p) epb_string = "custom"; break; } - fprintf(outf, "cpu%d: MSR_IA32_ENERGY_PERF_BIAS: 0x%08llx (%s)\n", cpu, msr, epb_string); + fprintf(outf, "cpu%d: EPB: %d (%s)\n", cpu, epb, epb_string); return 0; }