From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752525Ab0CWL02 (ORCPT ); Tue, 23 Mar 2010 07:26:28 -0400 Received: from cantor.suse.de ([195.135.220.2]:59861 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751750Ab0CWL0Z (ORCPT ); Tue, 23 Mar 2010 07:26:25 -0400 From: Thomas Renninger Organization: SUSE Products GmbH To: Borislav Petkov Subject: Re: [PATCH 3/5] cpufreq: Add APERF/MPERF support for AMD processors Date: Tue, 23 Mar 2010 12:26:22 +0100 User-Agent: KMail/1.12.4 (Linux/2.6.31.12-0.1-desktop; KDE/4.3.5; x86_64; ; ) Cc: akpm@linux-foundation.org, davej@redhat.com, cpufreq@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org References: <1269283121-11894-1-git-send-email-bp@amd64.org> <1269283121-11894-4-git-send-email-bp@amd64.org> In-Reply-To: <1269283121-11894-4-git-send-email-bp@amd64.org> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-6" Content-Transfer-Encoding: 7bit Message-Id: <201003231226.22756.trenn@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Monday 22 March 2010 19:38:39 Borislav Petkov wrote: > From: Mark Langsdorf > > Starting with model 10 of Family 0x10, AMD processors may have > support for APERF/MPERF. Add support for identifying it and using > it within cpufreq. Move the APERF/MPERF functions out of the > acpi-cpufreq code and into their own file so they can easily be > shared. > > Signed-off-by: Mark Langsdorf > Signed-off-by: Borislav Petkov > --- > arch/x86/kernel/cpu/amd.c | 6 +++ > arch/x86/kernel/cpu/cpufreq/Makefile | 4 +- > arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c | 44 +----------------------- > arch/x86/kernel/cpu/cpufreq/mperf.c | 50 ++++++++++++++++++++++++++++ > arch/x86/kernel/cpu/cpufreq/mperf.h | 9 +++++ > arch/x86/kernel/cpu/cpufreq/powernow-k8.c | 8 ++++ > 6 files changed, 77 insertions(+), 44 deletions(-) > create mode 100644 arch/x86/kernel/cpu/cpufreq/mperf.c > create mode 100644 arch/x86/kernel/cpu/cpufreq/mperf.h > > diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c > index e485825..796f662 100644 > --- a/arch/x86/kernel/cpu/amd.c > +++ b/arch/x86/kernel/cpu/amd.c > @@ -537,6 +537,12 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c) > set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC); > } > > + if (c->cpuid_level >= 6) { > + unsigned ecx = cpuid_ecx(6); > + if (ecx & 0x01) > + set_cpu_cap(c, X86_FEATURE_APERFMPERF); > + } This is nearly identical to (beside c->cpuid_level > 6), in arch/x86/kernel/cpu/intel.c: if (c->cpuid_level > 6) { unsigned ecx = cpuid_ecx(6); if (ecx & 0x01) set_cpu_cap(c, X86_FEATURE_APERFMPERF); } I expect you are correct... or could it get moved to general x86 init code? Thomas