- 10 4月, 2013 13 次提交
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由 Jacob Shin 提交于
Future AMD processors, starting with Family 16h, can provide software with feedback on how the workload may respond to frequency change -- memory-bound workloads will not benefit from higher frequency, where as compute-bound workloads will. This patch enables this "frequency sensitivity feedback" to aid the ondemand governor to make better frequency change decisions by hooking into the powersave bias. Signed-off-by: NJacob Shin <jacob.shin@amd.com> Acked-by: NThomas Renninger <trenn@suse.de> Acked-by: NBorislav Petkov <bp@suse.de> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Jacob Shin 提交于
This allows for another [arch specific] driver to hook into existing powersave bias function of the ondemand governor. i.e. This allows AMD specific powersave bias function (in a separate AMD specific driver) to aid ondemand governor's frequency transition decisions. Signed-off-by: NJacob Shin <jacob.shin@amd.com> Acked-by: NThomas Renninger <trenn@suse.de> Acked-by: NBorislav Petkov <bp@suse.de> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Nathan Zimmer 提交于
We eventually would like to remove the rwlock cpufreq_driver_lock or convert it back to a spinlock and protect the read sections with RCU. The first step in that direction is to make cpufreq_driver use RCU. I don't see an easy wasy to protect the cpufreq_cpu_data structure with RCU, so I am leaving it with the rwlock for now since under certain configs __cpufreq_cpu_get is a hot spot with 256+ cores. [rjw: Subject, changelog, white space] Signed-off-by: NNathan Zimmer <nzimmer@sgi.com> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of powerpc platforms/cell to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of SPARC architecture to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NDavid S. Miller <davem@davemloft.net> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of UNICORE-2 architecture to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NGuan Xuetao <gxt@mprc.pku.edu.cn> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of SUPERH architecture to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NPaul Mundt <lethal@linux-sh.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of MIPS architecture to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NJohn Crispin <blogic@openwrt.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of IA64 architecture to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NTony Luck <tony.luck@intel.com> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq drivers of CRIS architecture to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NJesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of BLACKFIN architecture to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NSteven Miao <realmz6@gmail.com> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of AVR32 based at32ap platform to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NHans-Christian Egtvedt <egtvedt@samfundet.no> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of ARM based sa11x0 platform to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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- 08 4月, 2013 6 次提交
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of ARM based integrator platform to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NArnd Bergmann <arnd@arndb.de> Acked-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of ARM based pxa2xx platform to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NEric Miao <eric.y.miao@gmail.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of ARM based pxa3xx platform to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NEric Miao <eric.y.miao@gmail.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of ARM based davinci platform to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NSekhar Nori <nsekhar@ti.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
This patch moves cpufreq driver of ARM based tegra platform to drivers/cpufreq. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NStephen Warren <swarren@nvidia.com> Tested-by: NStephen Warren <swarren@nvidia.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
Normally we keep drivers in alphabetical inside Kconfig and Makefile and over time this was broken for ARM cpufreq drivers. Fix it. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NStephen Warren <swarren@nvidia.com> Tested-by: NStephen Warren <swarren@nvidia.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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- 02 4月, 2013 7 次提交
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由 Viresh Kumar 提交于
big LITTLE is ARM's new Architecture focussing power/performance needs of modern world. More information about big LITTLE can be found here: http://www.arm.com/products/processors/technologies/biglittleprocessing.php http://lwn.net/Articles/481055/ In order to keep cpufreq support for all big LITTLE platforms simple/generic, this patch tries to add a generic cpufreq driver layer for all big LITTLE platforms. The driver is divided into two parts: - Core driver: Generic and shared across all big LITTLE SoC's - Glue drivers: Per platform drivers providing ops to the core driver This patch adds in a generic glue driver which would extract information from Device Tree. Future SoC's can either reuse the DT glue or write their own depending on the need. Signed-off-by: NSudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com> Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
Some assignments of policy-> min/max/cur/cpuinfo.min_freq/cpuinfo.max_freq aren't required as part of it is done by cpufreq driver or cpufreq core. Remove them. At some places we merge multiple lines together too. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NSekhar Nori <nsekhar@ti.com> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
Cpufreq core checks the range of target_freq before calling driver->target() and so we don't need to do it again. Remove it. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
cpufreq layer doesn't call cpufreq driver's callback for any offline CPU and so checking that isn't useful. Lets get rid of it. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NDavid S. Miller <davem@davemloft.net> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
policy->cpus contains all online cpus that have single shared clock line. And their frequencies are always updated together. Many SMP system's cpufreq drivers take care of this in individual drivers but the best place for this code is in cpufreq core. This patch modifies cpufreq_notify_transition() to notify frequency change for all cpus in policy->cpus and hence updates all users of this API. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NStephen Warren <swarren@nvidia.com> Tested-by: NStephen Warren <swarren@nvidia.com> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
Currently we are simply returning from target() if we encounter some error after broadcasting CPUFREQ_PRECHANGE notifier. Which looks to be wrong as others might depend on POSTCHANGE notifier for their functioning. So, better broadcast CPUFREQ_POSTCHANGE notifier for these failure cases too, but with old frequency. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
It is not possible for init() to be called for any cpu other than cpu0. During bootup whatever cpu is used to boot system will be assigned as cpu0. And later on policy->cpu can only change if we hotunplug all cpus first and then hotplug them back in different order, which isn't possible (system requires atleast one cpu to be up always :)). Though I can see one situation where policy->cpu can be different then zero. - Hot-unplug cpu 0. - rmmod cpufreq-cpu0 module - insmod it back - hotplug cpu 0 again. Here, policy->cpu would be different. But the driver doesn't have any dependency on cpu0 as such. We don't mind which cpu of a system is policy->cpu and so this check is just not required. Remove it. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Acked-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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- 01 4月, 2013 14 次提交
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由 Stratos Karafotis 提交于
Use an inline function to evaluate freq_target to avoid duplicate code. Also, define a macro for the default frequency step. Signed-off-by: NStratos Karafotis <stratosk@semaphore.gr> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Silviu-Mihai Popescu 提交于
Convert all uses of devm_request_and_ioremap() to the newly introduced devm_ioremap_resource() which provides more consistent error handling. devm_ioremap_resource() provides its own error messages so all explicit error messages can be removed from the failure code paths. Signed-off-by: NSilviu-Mihai Popescu <silviupopescu1990@gmail.com> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 jhbird.choi@samsung.com 提交于
clk_round_rate() returns singed value which was assigned to an unsigned variable. So it can't be checked for negative. Signed-off-by: NJonghwan Choi <jhbird.choi@samsung.com> Acked-by: NShawn Guo <shawn.guo@linaro.org> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Stratos Karafotis 提交于
When we evaluate the CPU load for frequency decrease we have to compare the load against down_threshold. There is no need to subtract 10 points from down_threshold. Instead, we have to use the default down_threshold or user's selection unmodified. Signed-off-by: NStratos Karafotis <stratosk@semaphore.gr> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Stratos Karafotis 提交于
sampling_down_factor tunable is unused since commit 8e677ce8 (4 years ago). This patch restores the original functionality and documents the tunable. Signed-off-by: NStratos Karafotis <stratosk@semaphore.gr> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Stratos Karafotis 提交于
Currently we always calculate the CPU iowait time and add it to idle time. If we are in ondemand and we use io_is_busy, we re-calculate iowait time and we subtract it from idle time. With this patch iowait time is calculated only when necessary avoiding the double call to get_cpu_iowait_time_us. We use a parameter in function get_cpu_idle_time to distinguish when the iowait time will be added to idle time or not, without the need of keeping the prev_io_wait. Signed-off-by: NStratos Karafotis <stratosk@semaphore.gr> Acked-by: NViresh Kumar <viresh.kumar@linaro.,org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Namhyung Kim 提交于
The relation should be CPUFREQ_RELATION_L to find optimal frequency when decreasing. Signed-off-by: NNamhyung Kim <namhyung@kernel.org> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Namhyung Kim 提交于
If we're on the lowest frequency, no need to calculate new freq. Break out even earlier in this case. Signed-off-by: NNamhyung Kim <namhyung@kernel.org> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
Following patch has introduced per cpu timers or works for ondemand and conservative governors. commit 2abfa876 Author: Rickard Andersson <rickard.andersson@stericsson.com> Date: Thu Dec 27 14:55:38 2012 +0000 cpufreq: handle SW coordinated CPUs This causes additional unnecessary interrupts on all cpus when the load is recently evaluated by any other cpu. i.e. When load is recently evaluated by cpu x, we don't really need any other cpu to evaluate this load again for the next sampling_rate time. Some sort of code is present to avoid that but we are still getting timer interrupts for all cpus. A good way of avoiding this would be to modify delays for all cpus (policy->cpus) whenever any cpu has evaluated load. This patch does this change and some related code cleanup. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
Because we have per cpu timer now, we check if we need to evaluate load again or not (In case it is recently evaluated). Here the 2nd cpu which got timer interrupt updates core_dbs_info->sample_type irrespective of load evaluation is required or not. Which is wrong as the first cpu is dependent on this variable set to an older value. Moreover it would be best in this case to schedule 2nd cpu's timer to sampling_rate instead of freq_lo or hi as that must be managed by the other cpu. In case the other cpu idles in between then also we wouldn't loose much power. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
Currently MIN_LATENCY_MULTIPLIER is set defined as 100 and so on a system with transition latency of 1 ms, the minimum sampling time comes to be around 100 ms. That is quite big if you want to get better performance for your system. Redefine MIN_LATENCY_MULTIPLIER to 20 so that we can support 20ms sampling rate for such platforms. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
Currently, there can't be multiple instances of single governor_type. If we have a multi-package system, where we have multiple instances of struct policy (per package), we can't have multiple instances of same governor. i.e. We can't have multiple instances of ondemand governor for multiple packages. Governors directory in sysfs is created at /sys/devices/system/cpu/cpufreq/ governor-name/. Which again reflects that there can be only one instance of a governor_type in the system. This is a bottleneck for multicluster system, where we want different packages to use same governor type, but with different tunables. This patch uses the infrastructure provided by earlier patch and implements init/exit routines for ondemand and conservative governors. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Viresh Kumar 提交于
Currently, there can't be multiple instances of single governor_type. If we have a multi-package system, where we have multiple instances of struct policy (per package), we can't have multiple instances of same governor. i.e. We can't have multiple instances of ondemand governor for multiple packages. Governors directory in sysfs is created at /sys/devices/system/cpu/cpufreq/ governor-name/. Which again reflects that there can be only one instance of a governor_type in the system. This is a bottleneck for multicluster system, where we want different packages to use same governor type, but with different tunables. This patch is inclined towards providing this infrastructure. Because we are required to allocate governor's resources dynamically now, we must do it at policy creation and end. And so got CPUFREQ_GOV_POLICY_INIT/EXIT. Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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由 Nathan Zimmer 提交于
This eliminates the contention I am seeing in __cpufreq_cpu_get. It also nicely stages the lock to be replaced by the rcu. Signed-off-by: NNathan Zimmer <nzimmer@sgi.com> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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