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path: root/drivers/cpufreq/intel_pstate.c
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2013-05-14cpufreq / intel_pstate: use vzalloc() instead of vmalloc()/memset(0)Wei Yongjun1-2/+1
Use vzalloc() instead of vmalloc() and memset(0). Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-05-12cpufreq / intel_pstate: remove #ifdef MODULE compile fenceDirk Brandewie1-2/+1
The driver can no longer be built as a module remove the compile fence around cpufreq tracing call. Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-05-12cpufreq / intel_pstate: Remove idle mode PIDDirk Brandewie1-49/+0
Remove dead code from the driver. Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-05-12cpufreq / intel_pstate: fix ffmpeg regressionDirk Brandewie1-8/+2
The ffmpeg benchmark in the phoronix test suite has threads on multiple cores that rely on the progress on of threads on other cores and ping pong back and forth fast enough to make the core appear less busy than it "should" be. If the core has been at minimum p-state for a while bump the pstate up to kick the core to see if it is in this ping pong state. If the core is truly idle the p-state will be reduced at the next sample time. If the core makes more progress it will send more work to the thread bringing both threads out of the ping pong scenario and the p-state will be selected normally. This fixes a performance regression of approximately 30% Cc: 3.9+ <stable@vger.kernel.org> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-05-12cpufreq / intel_pstate: use lowest requested max performanceDirk Brandewie1-3/+9
There are two ways that the maximum p-state can be clamped, via a policy change and via the sysfs file. The acpi-thermal driver adjusts the p-state policy in response to thermal events. These changes override the users settings at the moment. Use the lowest of the two requested values this ensures that we will not exceed the requested pstate from either mechanism. Reported-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Cc: 3.9+ <stable@vger.kernel.org> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-05-12cpufreq / intel_pstate: remove idle time and duration from sample and ↵Dirk Brandewie1-37/+8
calculations Idle time is taken into account in the APERF/MPERF ratio calculation there is no reason for the driver to track it seperately. This reduces the work in the driver and makes the code more readable. Removal of the tracking of sample duration removes the possibility of the divide by zero exception when the duration is sub 1us References: https://bugzilla.kernel.org/show_bug.cgi?id=56691 Reported-by: Mike Lothian <mike@fireburn.co.uk> Cc: 3.9+ <stable@vger.kernel.org> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-04-28Merge branch 'pm-cpufreq'Rafael J. Wysocki1-12/+9
* pm-cpufreq: (57 commits) cpufreq: MAINTAINERS: Add co-maintainer cpufreq: pxa2xx: initialize variables ARM: S5pv210: compiling issue, ARM_S5PV210_CPUFREQ needs CONFIG_CPU_FREQ_TABLE=y cpufreq: cpu0: Put cpu parent node after using it cpufreq: ARM big LITTLE: Adapt to latest cpufreq updates cpufreq: ARM big LITTLE: put DT nodes after using them cpufreq: Don't call __cpufreq_governor() for drivers without target() cpufreq: exynos5440: Protect OPP search calls with RCU lock cpufreq: dbx500: Round to closest available freq cpufreq: Call __cpufreq_governor() with correct policy->cpus mask cpufreq / intel_pstate: Optimize intel_pstate_set_policy cpufreq: OMAP: instantiate omap-cpufreq as a platform_driver arm: exynos: Enable OPP library support for exynos5440 cpufreq: exynos: Remove error return even if no soc is found cpufreq: exynos: Add cpufreq driver for exynos5440 cpufreq: AMD "frequency sensitivity feedback" powersave bias for ondemand governor cpufreq: ondemand: allow custom powersave_bias_target handler to be registered cpufreq: convert cpufreq_driver to using RCU cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq cpufreq: sparc: move cpufreq driver to drivers/cpufreq ... Conflicts: MAINTAINERS (with commit a8e39c3 from pm-cpuidle) drivers/cpufreq/cpufreq_governor.h (with commit beb0ff3)
2013-04-10cpufreq / intel_pstate: Optimize intel_pstate_set_policySrinivas Pandruvada1-12/+9
This function is called quite often from other subsystems. Removed unused call to intel_pstate_get_min_max(). Also when "policy->policy == CPUFREQ_POLICY_PERFORMANCE", then no need to do calculations as the limits will be forced anyway. Also corrected filename in the header. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-04-08cpufreq / intel_pstate: Set timer timeout correctlyDirk Brandewie1-1/+0
The current calculation of the delay time is wrong and a cut and paste error from a previous experimental driver. This can result in the timeout being set to jiffies + 1 which setup the driver to race with itself if the APIC timer interrupt happens at just the right time. References: https://bugzilla.redhat.com/show_bug.cgi?id=920289 Reported-by: Adam Williamson <awilliam@redhat.com> Reported-and-tested-by: Parag Warudkar <parag.lkml@gmail.com> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-25intel-pstate: Use #defines instead of hard-coded values.Konrad Rzeszutek Wilk1-3/+3
They are defined in coreboot (MSR_PLATFORM) and the other one is already defined in msr-index.h. Let's use those. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-25cpufreq / intel_pstate: Fix calculation of current frequencyDirk Brandewie1-1/+1
Use the correct pstate value to calculate the effective frequency. References: https://bugzilla.redhat.com/show_bug.cgi?id=923942 Reported-by: Satish Balay <balay@fastmail.fm> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-25cpufreq / intel_pstate: Add function to check that all MSRs are validDirk Brandewie1-0/+26
Some VMs seem to try to implement some MSRs but not all the registers the driver needs. Check to make sure all the MSR that we need are available. If any of the required MSRs are not available refuse to load. References: https://bugzilla.redhat.com/show_bug.cgi?id=922923 Reported-by: Josh Stone <jistone@redhat.com> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-06cpufreq / intel_pstate: Do not load on VM that does not report max P state.Dirk Brandewie1-0/+3
It seems some VMs support the P state MSRs but return zeros. Fail gracefully if we are running in this environment. References: https://bugzilla.redhat.com/show_bug.cgi?id=916833 Reported-by: Josh Boyer <jwboyer@redhat.com> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-06cpufreq / intel_pstate: Fix intel_pstate_init() error pathDirk Brandewie1-28/+11
If cpufreq_register_driver() fails just free memory that has been allocated and return. intel_pstate_exit() function is removed since we are built-in only now there is no reason for a module exit procedure. Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-15cpufreq / intel_pstate: Add kernel command line option disable intel_pstate.Dirk Brandewie1-0/+16
When intel_pstate is configured into the kernel it will become the preferred scaling driver for processors that it supports. Allow the user to override this by adding: intel_pstate=disable on the kernel command line. Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-11cpufreq / intel_pstate: Fix 32 bit buildDirk Brandewie1-1/+2
Fixes 32 bit build. on i386: drivers/built-in.o: In function `intel_pstate_timer_func': intel_pstate.c:(.text+0x4ce97e): undefined reference to `__udivdi3' drivers/built-in.o: In function `intel_pstate_cpu_init': intel_pstate.c:(.cpuinit.text+0x974): undefined reference to `__udivdi3' Reported-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09cpufreq/x86: Add P-state driver for sandy bridge.Dirk Brandewie1-0/+806
Add a P-state driver for the Intel Sandy bridge processor. In cpufreq terminology this driver implements a scaling driver with an internal governor. When built into the the kernel this driver will be the preferred scaling driver for Sandy bridge processors. In addition to the interfaces provided by the cpufreq subsystem for controlling scaling drivers. The user may control the behavior of the driver via three sysfs files located in "/sys/devices/system/cpu/intel_pstate". max_perf_pct: limits the maximum P state that will be requested by the driver stated as a percentage of the avail performance. min_perf_pct: limits the minimum P state that will be requested by the driver stated as a percentage of the avail performance. no_turbo: limits the driver to selecting P states below the turbo frequency range. Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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