From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dirk Brandewie Subject: Re: [PATCH 1/3] intel_pstate: skip the driver if Sun server has ACPI _PPC method Date: Wed, 19 Nov 2014 06:59:35 -0800 Message-ID: <546CB057.7040902@intel.com> References: <1416299826-15813-1-git-send-email-ethan.zhao@oracle.com> <1416299826-15813-6-git-send-email-ethan.zhao@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1416299826-15813-6-git-send-email-ethan.zhao@oracle.com> Sender: linux-kernel-owner@vger.kernel.org To: Ethan Zhao , viresh.kumar@linaro.org, rjw@rjwysocki.net, corbet@lwn.net Cc: dirk.j.brandewie@intel.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, ethan.kernel@gmail.com, joe.jin@oracle.com, brian.maly@oracle.com List-Id: linux-pm@vger.kernel.org On 11/18/2014 12:37 AM, Ethan Zhao wrote: > Oracle Sun X86 servers have dynamic power capping capability that works via > ACPI _PPC method etc, so skip loading this driver if Sun server has ACPI _PPC > enabled. > > Signed-off-by: Ethan Zhao > --- > drivers/cpufreq/intel_pstate.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c > index 27bb6d3..5498eb0 100644 > --- a/drivers/cpufreq/intel_pstate.c > +++ b/drivers/cpufreq/intel_pstate.c > @@ -943,6 +943,21 @@ static bool intel_pstate_no_acpi_pss(void) > return true; > } > > +static bool intel_pstate_has_acpi_ppc(void) > +{ > + int i; > + > + for_each_possible_cpu(i) { > + struct acpi_processor *pr = per_cpu(processors, i); > + > + if (!pr) > + continue; > + if (acpi_has_method(pr->handle, "_PPC")) > + return true; > + } > + return false; > +} > + > struct hw_vendor_info { > u16 valid; > char oem_id[ACPI_OEM_ID_SIZE]; > @@ -952,6 +967,7 @@ struct hw_vendor_info { > /* Hardware vendor-specific info that has its own power management modes */ > static struct hw_vendor_info vendor_info[] = { > {1, "HP ", "ProLiant"}, > + {1, "ORACLE", ""}, > {0, "", ""}, > }; > Does this apply to ALL oracle systems? Is the presence or absense of the _PPC method configurable in the oracle BIOS? > @@ -969,12 +985,16 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void) > !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) && > intel_pstate_no_acpi_pss()) > return true; > + if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && > + intel_pstate_has_acpi_ppc()) > + return true; > } > > return false; > } > #else /* CONFIG_ACPI not enabled */ > static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } > +static inline bool intel_pstate_has_acpi_ppc(void) { return false; } > #endif /* CONFIG_ACPI */ > > static int __init intel_pstate_init(void) >