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Test Result Summary of Calendar Week 41 for Linaro ubuntu.

by Botao Sun

Calendar Week 41: Here is test result summary for Linaro ubuntu image on following boards: 1) ARM Versatile Express A9; 2) Samsung Origen; 3) TI Panda Board 4430; 4) TI Panda Board 4460. Synopsis: No change on feature status for vexpress A9 & Samsung Origen boards. Both HDMI & DVI-D back to work on Panda 4430 & 4460. For SD card flashing, now command "dd" backs to work on all images. 1. vexpress A9 + ubuntu (Column AD): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdFNmV… Features' status is exactly same as previous week. 2. Origen + ubuntu (Column Y): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdEowN… Features' status is exactly same as previous week. 3. Panda 4430 + ubuntu (Column AA): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdEwwZ… Audio over HDMI doesn't work, and this causes no sound can be heard when using "rhythmbox" to play music. Bluetooth now let system crashes again, after pairing process. Also, system crashes during the Power Management test "lava-test run pwrmgmt", with log output flushing in serial console. 4. Panda 4460 + ubuntu (Column Y): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdEwwZ… The test result on Panda 4460 is quite different with Panda 4430. On TI Panda 4460 board, Audio over HDMI works well, Bluetooth headset works well, and Power Management test works well. Even suspend / resume starts to work, although many error log output flushes in serial console. For the previous week (Calendar week 40) summary, please refer to attachment. Thank you. Best Regards Botao Sun

13 years

[RFC] Config Fragment for kernel debug features

by Viresh Kumar

Hi Andrey, I was just thinking, it would be good if we have another config fragment in linaro/ to enable kernel debug config options like: CONFIG_DEBUG_INFO. What do you think? -- viresh

13 years

[PATCH v2] ARM: hw_breakpoint: v7.1 self-hosted debug powerdown support

by Dietmar Eggemann

This patch introduces os save and restore mechanism for v7.1 debug and self-hosted debuggers. It enables the os to save DBGDSCR before powerdown and restore it when power is restored. The clearing of the os lock in the restore function kick-starts the debug logic again. The os save and restore routines are hooked into the CPU PM event notifier chain. CPU PM events are used to save and restore per-cpu context when a single CPU is preparing to enter or has exited a low power state. Signed-off-by: Dietmar Eggemann <dietmar.eggemann(a)arm.com> --- Hi Viresh, this patch is for the upcoming Linaro release. Tested on TC2 big.LITTLE testchip (cpuidle, on both A7 and A15 clusters). The patch is against 8f18a4e pdsw-ci:29418/kernel, branch origin/linaro-lt-integration-linaro-vexpress. Review comment from Liviu fixed. arch/arm/kernel/hw_breakpoint.c | 57 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c index 281bf33..eed4d0c 100644 --- a/arch/arm/kernel/hw_breakpoint.c +++ b/arch/arm/kernel/hw_breakpoint.c @@ -28,6 +28,7 @@ #include <linux/perf_event.h> #include <linux/hw_breakpoint.h> #include <linux/smp.h> +#include <linux/cpu_pm.h> #include <asm/cacheflush.h> #include <asm/cputype.h> @@ -42,6 +43,11 @@ static DEFINE_PER_CPU(struct perf_event *, bp_on_reg[ARM_MAX_BRP]); /* Watchpoint currently in use for each WRP. */ static DEFINE_PER_CPU(struct perf_event *, wp_on_reg[ARM_MAX_WRP]); +#ifdef CONFIG_CPU_PM +/* Storage for OS Save and Restore. */ +static DEFINE_PER_CPU(u32, cpu_dscr); +#endif + /* Number of BRP/WRP registers on this CPU. */ static int core_num_brps; static int core_num_wrps; @@ -990,6 +996,55 @@ static struct notifier_block __cpuinitdata dbg_reset_nb = { .notifier_call = dbg_reset_notify, }; +#ifdef CONFIG_CPU_PM +static void os_save(int cpu) +{ + /* Set OS Lock. */ + asm volatile("mcr p14, 0, %0, c1, c0, 4" : : "r" (0xC5ACCE55)); + isb(); + + /* Save DSCRext. */ + ARM_DBG_READ(c2, 2, per_cpu(cpu_dscr, cpu)); +} + +static void os_restore(int cpu) +{ + /* Restore DSCRext. */ + ARM_DBG_WRITE(c2, 2, per_cpu(cpu_dscr, cpu)); + + /* Clear OS Lock. */ + asm volatile("mcr p14, 0, %0, c1, c0, 4" : : "r" (0)); + isb(); +} + +static int dbg_cpu_pm_notify(struct notifier_block *self, unsigned long action, + void *v) +{ + int cpu = smp_processor_id(); + + if (action == CPU_PM_ENTER) + os_save(cpu); + else if (action == CPU_PM_EXIT) + os_restore(cpu); + + return NOTIFY_OK; +} + +static struct notifier_block __cpuinitdata dbg_cpu_pm_nb = { + .notifier_call = dbg_cpu_pm_notify, +}; + +static void __init pm_init(void) +{ + if (get_debug_arch() == ARM_DEBUG_ARCH_V7_1) + cpu_pm_register_notifier(&dbg_cpu_pm_nb); +} +#else +static inline void pm_init(void) +{ +} +#endif + static int __init arch_hw_breakpoint_init(void) { u32 dscr; @@ -1048,6 +1103,8 @@ static int __init arch_hw_breakpoint_init(void) /* Register hotplug notifier. */ register_cpu_notifier(&dbg_reset_nb); + + pm_init(); return 0; } arch_initcall(arch_hw_breakpoint_init); -- 1.7.9.5

13 years

Android Mini-Summit and Sessions

by Zach Pfeffer

Hey everyone, About to put this in summit: https://docs.google.com/a/linaro.org/document/d/1gdmjguZSKyoVUlqteX1-ldIFEp… Are we missing anything big? -- Zach Pfeffer Android Platform Team Lead, Linaro Platform Teams Linaro.org | Open source software for ARM SoCs Follow Linaro: http://www.facebook.com/pages/Linaro http://twitter.com/#!/linaroorg - http://www.linaro.org/linaro-blog

13 years

[PATCH 0/4] cpuidle - support multiple drivers at a time

by Daniel Lezcano

The discussion about having different cpus on the system with different latencies bring us to a first attemp by adding a pointer in the cpuidle_device to the states array. But as Rafael suggested, it would make more sense to create a driver per cpu [1]. This patch adds support for multiple cpuidle drivers. It creates a per cpu cpuidle driver pointer. In order to not break the different drivers, the function cpuidle_register_driver assign for each cpu, the driver. The multiple driver support is optional and if it is not set, the cpuide driver core code remains the same (except some code reorganisation). I did the following tests compiled, booted, tested without/with CONFIG_CPU_IDLE, with/without CONFIG_CPU_IDLE_MULTIPLE_DRIVERS. Tested on Core2 Duo T9500 with acpi_idle [and intel_idle] Tested on ARM Dual Cortex-A9 U8500 (aka Snowball) [1] http://www.spinics.net/lists/linux-acpi/msg37921.html Daniel Lezcano (4): cpuidle : move driver's refcount to cpuidle cpuidle : move driver checking within the lock section cpuidle - prepare the driver core to be multi drivers aware cpuidle - support multiple drivers drivers/cpuidle/Kconfig | 9 ++ drivers/cpuidle/cpuidle.c | 24 ++++-- drivers/cpuidle/driver.c | 194 ++++++++++++++++++++++++++++++++++++++------- drivers/cpuidle/sysfs.c | 50 +++++++++--- include/linux/cpuidle.h | 9 ++- 5 files changed, 238 insertions(+), 48 deletions(-) -- 1.7.5.4

13 years

alsa UCM

by Sebastien LEDUC

Hi, We are potentially interested in contributing to the alsa UCM for Android initiative. Is there still some activities around that? Thanks Regards, Sebastien [cid:image001.png@01CDA7CF.6B9F6710] Sebastien Le Duc | Tel: +33 476 58 54 14 | Mobile: +33 684 43 07 00 APE | Audio Technical Leader ST online: www.st.com<http://www.st.com/> | Follow us on twitter: @st_world<http://twitter.com/#!/ST_World>

13 years

[PATCH] cpufreq: vexpress: cpufreq driver name can't be longer than 15 chars

by Viresh Kumar

Following is the declaration of name field in struct cpufreq_driver: char name[CPUFREQ_NAME_LEN]; where CPUFREQ_NAME_LEN is 16. So, length of drivers name must be <=15 (one position for '\0'). Current name is crossing this limit and so name doesn't get printed properly when we do: $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver This patch renames driver-name to fix this issue. Signed-off-by: Viresh Kumar <viresh.kumar(a)linaro.org> --- drivers/cpufreq/vexpress_bL_cpufreq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cpufreq/vexpress_bL_cpufreq.c b/drivers/cpufreq/vexpress_bL_cpufreq.c index 8b7ec18..541fc40 100644 --- a/drivers/cpufreq/vexpress_bL_cpufreq.c +++ b/drivers/cpufreq/vexpress_bL_cpufreq.c @@ -244,7 +244,7 @@ static struct cpufreq_driver vexpress_cpufreq_driver = { .target = vexpress_cpufreq_set_target, .get = vexpress_cpufreq_get, .init = vexpress_cpufreq_init, - .name = "cpufreq_vexpress", + .name = "vexpress-bL", .attr = vexpress_cpufreq_attr, }; -- 1.7.12.rc2.18.g61b472e

13 years

Interesting(?) health failure

by Dave Pigott

Hi all, I found an interesting health failure today on origen07 http://validation.linaro.org/lava-server/scheduler/job/35016/log_file When you look at the log, you see that the board starts off at the u-boot prompt. It then tries to do a "reboot", which (obviously) fails. So naturally, it then does a hard reset, and this is where it does something very odd: It interrupts the boot and tries to boot the previously installed test image. I haven't yet looked at the dispatcher code to figure out why (that's my next job). What then started alarm bells ringing was that I saw this: 1261680 bytes read reading uInitrd 1532597 bytes read reading board.dtb ** Unable to read "board.dtb" from mmc 0:5 ** So whatever the test image was, it was expecting a device tree blob, which I would have assumed would have to have been installed during deploy_linaro_image() being that if there is one it should just be part of the test boot deployment. So I looked at the log from the previous job: http://validation.linaro.org/lava-server/scheduler/job/34938/log_file#entry… and sure enough, you'll see at that mark the same issue. So there are two things: 1) There's some twisted logic in the dispatcher that's making it do odd things if it starts off in u-boot 2) Do we have an issue with dtbs not being handled properly by lava, or is it just that the hwpack was incomplete? Thanks Dave

13 years

Re: [PATCH v4 1/3] devfreq: Core updates to support devices which can idle

by MyungJoo Ham

> Prepare devfreq core framework to support devices which > can idle. When device idleness is detected perhaps through > runtime-pm, need some mechanism to suspend devfreq load > monitoring and resume back when device is online. Present > code continues monitoring unless device is removed from > devfreq core. > > This patch introduces following design changes, > > - use per device work instead of global work to monitor device > load. This enables suspend/resume of device devfreq and > reduces monitoring code complexity. > - decouple delayed work based load monitoring logic from core > by introducing helpers functions to be used by governors. This > provides flexibility for governors either to use delayed work > based monitoring functions or to implement their own mechanism. > - devfreq core interacts with governors via events to perform > specific actions. These events include start/stop devfreq. > This sets ground for adding suspend/resume events. > > The devfreq apis are not modified and are kept intact. > > Signed-off-by: Rajagopal Venkat <rajagopal.venkat(a)linaro.org> Thank you! Reviewed and Tested (at Exynos4210-Nuri). Acked-by: MyungJoo Ham <myungjoo.ham(a)samsung.com> > --- > Documentation/ABI/testing/sysfs-class-devfreq | 8 - > drivers/devfreq/devfreq.c | 443 +++++++++++--------------- > drivers/devfreq/governor.h | 11 + > drivers/devfreq/governor_performance.c | 16 +- > drivers/devfreq/governor_powersave.c | 16 +- > drivers/devfreq/governor_simpleondemand.c | 24 ++ > drivers/devfreq/governor_userspace.c | 23 +- > include/linux/devfreq.h | 34 +- > 8 files changed, 279 insertions(+), 296 deletions(-) > > diff --git a/Documentation/ABI/testing/sysfs-class-devfreq b/Documentation/ABI/testing/sysfs-class-devfreq > index 23d78b5..89283b1 100644 > --- a/Documentation/ABI/testing/sysfs-class-devfreq > +++ b/Documentation/ABI/testing/sysfs-class-devfreq > @@ -21,14 +21,6 @@ Description: > The /sys/class/devfreq/.../cur_freq shows the current > frequency of the corresponding devfreq object. > > -What: /sys/class/devfreq/.../central_polling > -Date: September 2011 > -Contact: MyungJoo Ham <myungjoo.ham(a)samsung.com> > -Description: > - The /sys/class/devfreq/.../central_polling shows whether > - the devfreq ojbect is using devfreq-provided central > - polling mechanism or not. > - > What: /sys/class/devfreq/.../polling_interval > Date: September 2011 > Contact: MyungJoo Ham <myungjoo.ham(a)samsung.com> > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c > index b146d76..41a4099 100644 > --- a/drivers/devfreq/devfreq.c > +++ b/drivers/devfreq/devfreq.c > @@ -30,17 +30,11 @@ > struct class *devfreq_class; > > /* > - * devfreq_work periodically monitors every registered device. > - * The minimum polling interval is one jiffy. The polling interval is > - * determined by the minimum polling period among all polling devfreq > - * devices. The resolution of polling interval is one jiffy. > + * devfreq core provides delayed work based load monitoring helper > + * functions. Governors can use these or can implement their own > + * monitoring mechanism. > */ > -static bool polling; > static struct workqueue_struct *devfreq_wq; > -static struct delayed_work devfreq_work; > - > -/* wait removing if this is to be removed */ > -static struct devfreq *wait_remove_device; > > /* The list of all device-devfreq */ > static LIST_HEAD(devfreq_list); > @@ -72,6 +66,8 @@ static struct devfreq *find_device_devfreq(struct device *dev) > return ERR_PTR(-ENODEV); > } > > +/* Load monitoring helper functions for governors use */ > + > /** > * update_devfreq() - Reevaluate the device and configure frequency. > * @devfreq: the devfreq instance. > @@ -121,6 +117,152 @@ int update_devfreq(struct devfreq *devfreq) > } > > /** > + * devfreq_monitor() - Periodically poll devfreq objects. > + * @work: the work struct used to run devfreq_monitor periodically. > + * > + */ > +static void devfreq_monitor(struct work_struct *work) > +{ > + int err; > + struct devfreq *devfreq = container_of(work, > + struct devfreq, work.work); > + > + mutex_lock(&devfreq->lock); > + err = update_devfreq(devfreq); > + if (err) > + dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); > + > + queue_delayed_work(devfreq_wq, &devfreq->work, > + msecs_to_jiffies(devfreq->profile->polling_ms)); > + mutex_unlock(&devfreq->lock); > +} > + > +/** > + * devfreq_monitor_start() - Start load monitoring of devfreq instance > + * @devfreq: the devfreq instance. > + * > + * Helper function for starting devfreq device load monitoing. By > + * default delayed work based monitoring is supported. Function > + * to be called from governor in response to DEVFREQ_GOV_START > + * event when device is added to devfreq framework. > + */ > +void devfreq_monitor_start(struct devfreq *devfreq) > +{ > + INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); > + if (devfreq->profile->polling_ms) > + queue_delayed_work(devfreq_wq, &devfreq->work, > + msecs_to_jiffies(devfreq->profile->polling_ms)); > +} > + > +/** > + * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance > + * @devfreq: the devfreq instance. > + * > + * Helper function to stop devfreq device load monitoing. Function > + * to be called from governor in response to DEVFREQ_GOV_STOP > + * event when device is removed from devfreq framework. > + */ > +void devfreq_monitor_stop(struct devfreq *devfreq) > +{ > + cancel_delayed_work_sync(&devfreq->work); > +} > + > +/** > + * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance > + * @devfreq: the devfreq instance. > + * > + * Helper function to suspend devfreq device load monitoing. Function > + * to be called from governor in response to DEVFREQ_GOV_SUSPEND > + * event or when polling interval is set to zero. > + * > + * Note: Though this function is same as devfreq_monitor_stop(), > + * intentionally kept separate to provide hooks for collecting > + * transition statistics. > + */ > +void devfreq_monitor_suspend(struct devfreq *devfreq) > +{ > + mutex_lock(&devfreq->lock); > + if (devfreq->stop_polling) { > + mutex_unlock(&devfreq->lock); > + return; > + } > + > + devfreq->stop_polling = true; > + mutex_unlock(&devfreq->lock); > + cancel_delayed_work_sync(&devfreq->work); > +} > + > +/** > + * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance > + * @devfreq: the devfreq instance. > + * > + * Helper function to resume devfreq device load monitoing. Function > + * to be called from governor in response to DEVFREQ_GOV_RESUME > + * event or when polling interval is set to non-zero. > + */ > +void devfreq_monitor_resume(struct devfreq *devfreq) > +{ > + mutex_lock(&devfreq->lock); > + if (!devfreq->stop_polling) > + goto out; > + > + if (!delayed_work_pending(&devfreq->work) && > + devfreq->profile->polling_ms) > + queue_delayed_work(devfreq_wq, &devfreq->work, > + msecs_to_jiffies(devfreq->profile->polling_ms)); > + devfreq->stop_polling = false; > + > +out: > + mutex_unlock(&devfreq->lock); > +} > + > +/** > + * devfreq_interval_update() - Update device devfreq monitoring interval > + * @devfreq: the devfreq instance. > + * @delay: new polling interval to be set. > + * > + * Helper function to set new load monitoring polling interval. Function > + * to be called from governor in response to DEVFREQ_GOV_INTERVAL event. > + */ > +void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay) > +{ > + unsigned int cur_delay = devfreq->profile->polling_ms; > + unsigned int new_delay = *delay; > + > + mutex_lock(&devfreq->lock); > + devfreq->profile->polling_ms = new_delay; > + > + if (devfreq->stop_polling) > + goto out; > + > + /* if new delay is zero, stop polling */ > + if (!new_delay) { > + mutex_unlock(&devfreq->lock); > + cancel_delayed_work_sync(&devfreq->work); > + return; > + } > + > + /* if current delay is zero, start polling with new delay */ > + if (!cur_delay) { > + queue_delayed_work(devfreq_wq, &devfreq->work, > + msecs_to_jiffies(devfreq->profile->polling_ms)); > + goto out; > + } > + > + /* if current delay is greater than new delay, restart polling */ > + if (cur_delay > new_delay) { > + mutex_unlock(&devfreq->lock); > + cancel_delayed_work_sync(&devfreq->work); > + mutex_lock(&devfreq->lock); > + if (!devfreq->stop_polling) > + queue_delayed_work(devfreq_wq, &devfreq->work, > + msecs_to_jiffies(devfreq->profile->polling_ms)); > + } > +out: > + mutex_unlock(&devfreq->lock); > +} > + > +/** > * devfreq_notifier_call() - Notify that the device frequency requirements > * has been changed out of devfreq framework. > * @nb the notifier_block (supposed to be devfreq->nb) > @@ -143,59 +285,33 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, > } > > /** > - * _remove_devfreq() - Remove devfreq from the device. > + * _remove_devfreq() - Remove devfreq from the devfreq list and > + release its resources. > * @devfreq: the devfreq struct > * @skip: skip calling device_unregister(). > - * > - * Note that the caller should lock devfreq->lock before calling > - * this. _remove_devfreq() will unlock it and free devfreq > - * internally. devfreq_list_lock should be locked by the caller > - * as well (not relased at return) > - * > - * Lock usage: > - * devfreq->lock: locked before call. > - * unlocked at return (and freed) > - * devfreq_list_lock: locked before call. > - * kept locked at return. > - * if devfreq is centrally polled. > - * > - * Freed memory: > - * devfreq > */ > static void _remove_devfreq(struct devfreq *devfreq, bool skip) > { > - if (!mutex_is_locked(&devfreq->lock)) { > - WARN(true, "devfreq->lock must be locked by the caller.\n"); > - return; > - } > - if (!devfreq->governor->no_central_polling && > - !mutex_is_locked(&devfreq_list_lock)) { > - WARN(true, "devfreq_list_lock must be locked by the caller.\n"); > + mutex_lock(&devfreq_list_lock); > + if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) { > + mutex_unlock(&devfreq_list_lock); > + dev_warn(&devfreq->dev, "releasing devfreq which doesn't exist\n"); > return; > } > + list_del(&devfreq->node); > + mutex_unlock(&devfreq_list_lock); > > - if (devfreq->being_removed) > - return; > - > - devfreq->being_removed = true; > + devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_STOP, NULL); > > if (devfreq->profile->exit) > devfreq->profile->exit(devfreq->dev.parent); > > - if (devfreq->governor->exit) > - devfreq->governor->exit(devfreq); > - > if (!skip && get_device(&devfreq->dev)) { > device_unregister(&devfreq->dev); > put_device(&devfreq->dev); > } > > - if (!devfreq->governor->no_central_polling) > - list_del(&devfreq->node); > - > - mutex_unlock(&devfreq->lock); > mutex_destroy(&devfreq->lock); > - > kfree(devfreq); > } > > @@ -210,130 +326,8 @@ static void _remove_devfreq(struct devfreq *devfreq, bool skip) > static void devfreq_dev_release(struct device *dev) > { > struct devfreq *devfreq = to_devfreq(dev); > - bool central_polling = !devfreq->governor->no_central_polling; > - > - /* > - * If devfreq_dev_release() was called by device_unregister() of > - * _remove_devfreq(), we cannot mutex_lock(&devfreq->lock) and > - * being_removed is already set. This also partially checks the case > - * where devfreq_dev_release() is called from a thread other than > - * the one called _remove_devfreq(); however, this case is > - * dealt completely with another following being_removed check. > - * > - * Because being_removed is never being > - * unset, we do not need to worry about race conditions on > - * being_removed. > - */ > - if (devfreq->being_removed) > - return; > > - if (central_polling) > - mutex_lock(&devfreq_list_lock); > - > - mutex_lock(&devfreq->lock); > - > - /* > - * Check being_removed flag again for the case where > - * devfreq_dev_release() was called in a thread other than the one > - * possibly called _remove_devfreq(). > - */ > - if (devfreq->being_removed) { > - mutex_unlock(&devfreq->lock); > - goto out; > - } > - > - /* devfreq->lock is unlocked and removed in _removed_devfreq() */ > _remove_devfreq(devfreq, true); > - > -out: > - if (central_polling) > - mutex_unlock(&devfreq_list_lock); > -} > - > -/** > - * devfreq_monitor() - Periodically poll devfreq objects. > - * @work: the work struct used to run devfreq_monitor periodically. > - * > - */ > -static void devfreq_monitor(struct work_struct *work) > -{ > - static unsigned long last_polled_at; > - struct devfreq *devfreq, *tmp; > - int error; > - unsigned long jiffies_passed; > - unsigned long next_jiffies = ULONG_MAX, now = jiffies; > - struct device *dev; > - > - /* Initially last_polled_at = 0, polling every device at bootup */ > - jiffies_passed = now - last_polled_at; > - last_polled_at = now; > - if (jiffies_passed == 0) > - jiffies_passed = 1; > - > - mutex_lock(&devfreq_list_lock); > - list_for_each_entry_safe(devfreq, tmp, &devfreq_list, node) { > - mutex_lock(&devfreq->lock); > - dev = devfreq->dev.parent; > - > - /* Do not remove tmp for a while */ > - wait_remove_device = tmp; > - > - if (devfreq->governor->no_central_polling || > - devfreq->next_polling == 0) { > - mutex_unlock(&devfreq->lock); > - continue; > - } > - mutex_unlock(&devfreq_list_lock); > - > - /* > - * Reduce more next_polling if devfreq_wq took an extra > - * delay. (i.e., CPU has been idled.) > - */ > - if (devfreq->next_polling <= jiffies_passed) { > - error = update_devfreq(devfreq); > - > - /* Remove a devfreq with an error. */ > - if (error && error != -EAGAIN) { > - > - dev_err(dev, "Due to update_devfreq error(%d), devfreq(%s) is removed from the device\n", > - error, devfreq->governor->name); > - > - /* > - * Unlock devfreq before locking the list > - * in order to avoid deadlock with > - * find_device_devfreq or others > - */ > - mutex_unlock(&devfreq->lock); > - mutex_lock(&devfreq_list_lock); > - /* Check if devfreq is already removed */ > - if (IS_ERR(find_device_devfreq(dev))) > - continue; > - mutex_lock(&devfreq->lock); > - /* This unlocks devfreq->lock and free it */ > - _remove_devfreq(devfreq, false); > - continue; > - } > - devfreq->next_polling = devfreq->polling_jiffies; > - } else { > - devfreq->next_polling -= jiffies_passed; > - } > - > - if (devfreq->next_polling) > - next_jiffies = (next_jiffies > devfreq->next_polling) ? > - devfreq->next_polling : next_jiffies; > - > - mutex_unlock(&devfreq->lock); > - mutex_lock(&devfreq_list_lock); > - } > - wait_remove_device = NULL; > - mutex_unlock(&devfreq_list_lock); > - > - if (next_jiffies > 0 && next_jiffies < ULONG_MAX) { > - polling = true; > - queue_delayed_work(devfreq_wq, &devfreq_work, next_jiffies); > - } else { > - polling = false; > - } > } > > /** > @@ -357,16 +351,13 @@ struct devfreq *devfreq_add_device(struct device *dev, > return ERR_PTR(-EINVAL); > } > > - > - if (!governor->no_central_polling) { > - mutex_lock(&devfreq_list_lock); > - devfreq = find_device_devfreq(dev); > - mutex_unlock(&devfreq_list_lock); > - if (!IS_ERR(devfreq)) { > - dev_err(dev, "%s: Unable to create devfreq for the device. It already has one.\n", __func__); > - err = -EINVAL; > - goto err_out; > - } > + mutex_lock(&devfreq_list_lock); > + devfreq = find_device_devfreq(dev); > + mutex_unlock(&devfreq_list_lock); > + if (!IS_ERR(devfreq)) { > + dev_err(dev, "%s: Unable to create devfreq for the device. It already has one.\n", __func__); > + err = -EINVAL; > + goto err_out; > } > > devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); > @@ -386,48 +377,41 @@ struct devfreq *devfreq_add_device(struct device *dev, > devfreq->governor = governor; > devfreq->previous_freq = profile->initial_freq; > devfreq->data = data; > - devfreq->next_polling = devfreq->polling_jiffies > - = msecs_to_jiffies(devfreq->profile->polling_ms); > devfreq->nb.notifier_call = devfreq_notifier_call; > > dev_set_name(&devfreq->dev, dev_name(dev)); > err = device_register(&devfreq->dev); > if (err) { > put_device(&devfreq->dev); > + mutex_unlock(&devfreq->lock); > goto err_dev; > } > > - if (governor->init) > - err = governor->init(devfreq); > - if (err) > - goto err_init; > - > mutex_unlock(&devfreq->lock); > > - if (governor->no_central_polling) > - goto out; > - > mutex_lock(&devfreq_list_lock); > - > list_add(&devfreq->node, &devfreq_list); > + mutex_unlock(&devfreq_list_lock); > > - if (devfreq_wq && devfreq->next_polling && !polling) { > - polling = true; > - queue_delayed_work(devfreq_wq, &devfreq_work, > - devfreq->next_polling); > + err = devfreq->governor->event_handler(devfreq, > + DEVFREQ_GOV_START, NULL); > + if (err) { > + dev_err(dev, "%s: Unable to start governor for the device\n", > + __func__); > + goto err_init; > } > - mutex_unlock(&devfreq_list_lock); > -out: > + > return devfreq; > > err_init: > + list_del(&devfreq->node); > device_unregister(&devfreq->dev); > err_dev: > - mutex_unlock(&devfreq->lock); > kfree(devfreq); > err_out: > return ERR_PTR(err); > } > +EXPORT_SYMBOL(devfreq_add_device); > > /** > * devfreq_remove_device() - Remove devfreq feature from a device. > @@ -435,30 +419,14 @@ err_out: > */ > int devfreq_remove_device(struct devfreq *devfreq) > { > - bool central_polling; > - > if (!devfreq) > return -EINVAL; > > - central_polling = !devfreq->governor->no_central_polling; > - > - if (central_polling) { > - mutex_lock(&devfreq_list_lock); > - while (wait_remove_device == devfreq) { > - mutex_unlock(&devfreq_list_lock); > - schedule(); > - mutex_lock(&devfreq_list_lock); > - } > - } > - > - mutex_lock(&devfreq->lock); > - _remove_devfreq(devfreq, false); /* it unlocks devfreq->lock */ > - > - if (central_polling) > - mutex_unlock(&devfreq_list_lock); > + _remove_devfreq(devfreq, false); > > return 0; > } > +EXPORT_SYMBOL(devfreq_remove_device); > > static ssize_t show_governor(struct device *dev, > struct device_attribute *attr, char *buf) > @@ -490,35 +458,13 @@ static ssize_t store_polling_interval(struct device *dev, > if (ret != 1) > goto out; > > - mutex_lock(&df->lock); > - df->profile->polling_ms = value; > - df->next_polling = df->polling_jiffies > - = msecs_to_jiffies(value); > - mutex_unlock(&df->lock); > - > + df->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value); > ret = count; > > - if (df->governor->no_central_polling) > - goto out; > - > - mutex_lock(&devfreq_list_lock); > - if (df->next_polling > 0 && !polling) { > - polling = true; > - queue_delayed_work(devfreq_wq, &devfreq_work, > - df->next_polling); > - } > - mutex_unlock(&devfreq_list_lock); > out: > return ret; > } > > -static ssize_t show_central_polling(struct device *dev, > - struct device_attribute *attr, char *buf) > -{ > - return sprintf(buf, "%d\n", > - !to_devfreq(dev)->governor->no_central_polling); > -} > - > static ssize_t store_min_freq(struct device *dev, struct device_attribute *attr, > const char *buf, size_t count) > { > @@ -590,7 +536,6 @@ static ssize_t show_max_freq(struct device *dev, struct device_attribute *attr, > static struct device_attribute devfreq_attrs[] = { > __ATTR(governor, S_IRUGO, show_governor, NULL), > __ATTR(cur_freq, S_IRUGO, show_freq, NULL), > - __ATTR(central_polling, S_IRUGO, show_central_polling, NULL), > __ATTR(polling_interval, S_IRUGO | S_IWUSR, show_polling_interval, > store_polling_interval), > __ATTR(min_freq, S_IRUGO | S_IWUSR, show_min_freq, store_min_freq), > @@ -598,23 +543,6 @@ static struct device_attribute devfreq_attrs[] = { > { }, > }; > > -/** > - * devfreq_start_polling() - Initialize data structure for devfreq framework and > - * start polling registered devfreq devices. > - */ > -static int __init devfreq_start_polling(void) > -{ > - mutex_lock(&devfreq_list_lock); > - polling = false; > - devfreq_wq = create_freezable_workqueue("devfreq_wq"); > - INIT_DEFERRABLE_WORK(&devfreq_work, devfreq_monitor); > - mutex_unlock(&devfreq_list_lock); > - > - devfreq_monitor(&devfreq_work.work); > - return 0; > -} > -late_initcall(devfreq_start_polling); > - > static int __init devfreq_init(void) > { > devfreq_class = class_create(THIS_MODULE, "devfreq"); > @@ -622,7 +550,15 @@ static int __init devfreq_init(void) > pr_err("%s: couldn't create class\n", __FILE__); > return PTR_ERR(devfreq_class); > } > + > + devfreq_wq = create_freezable_workqueue("devfreq_wq"); > + if (IS_ERR(devfreq_wq)) { > + class_destroy(devfreq_class); > + pr_err("%s: couldn't create workqueue\n", __FILE__); > + return PTR_ERR(devfreq_wq); > + } > devfreq_class->dev_attrs = devfreq_attrs; > + > return 0; > } > subsys_initcall(devfreq_init); > @@ -630,6 +566,7 @@ subsys_initcall(devfreq_init); > static void __exit devfreq_exit(void) > { > class_destroy(devfreq_class); > + destroy_workqueue(devfreq_wq); > } > module_exit(devfreq_exit); > > diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h > index ea7f13c..bb3aff3 100644 > --- a/drivers/devfreq/governor.h > +++ b/drivers/devfreq/governor.h > @@ -18,7 +18,18 @@ > > #define to_devfreq(DEV) container_of((DEV), struct devfreq, dev) > > +/* Devfreq events */ > +#define DEVFREQ_GOV_START 0x1 > +#define DEVFREQ_GOV_STOP 0x2 > +#define DEVFREQ_GOV_INTERVAL 0x3 > + > /* Caution: devfreq->lock must be locked before calling update_devfreq */ > extern int update_devfreq(struct devfreq *devfreq); > > +extern void devfreq_monitor_start(struct devfreq *devfreq); > +extern void devfreq_monitor_stop(struct devfreq *devfreq); > +extern void devfreq_monitor_suspend(struct devfreq *devfreq); > +extern void devfreq_monitor_resume(struct devfreq *devfreq); > +extern void devfreq_interval_update(struct devfreq *devfreq, > + unsigned int *delay); > #endif /* _GOVERNOR_H */ > diff --git a/drivers/devfreq/governor_performance.c b/drivers/devfreq/governor_performance.c > index af75ddd..eea3f9b 100644 > --- a/drivers/devfreq/governor_performance.c > +++ b/drivers/devfreq/governor_performance.c > @@ -26,14 +26,22 @@ static int devfreq_performance_func(struct devfreq *df, > return 0; > } > > -static int performance_init(struct devfreq *devfreq) > +static int devfreq_performance_handler(struct devfreq *devfreq, > + unsigned int event, void *data) > { > - return update_devfreq(devfreq); > + int ret = 0; > + > + if (event == DEVFREQ_GOV_START) { > + mutex_lock(&devfreq->lock); > + ret = update_devfreq(devfreq); > + mutex_unlock(&devfreq->lock); > + } > + > + return ret; > } > > const struct devfreq_governor devfreq_performance = { > .name = "performance", > - .init = performance_init, > .get_target_freq = devfreq_performance_func, > - .no_central_polling = true, > + .event_handler = devfreq_performance_handler, > }; > diff --git a/drivers/devfreq/governor_powersave.c b/drivers/devfreq/governor_powersave.c > index fec0cdb..2868d98 100644 > --- a/drivers/devfreq/governor_powersave.c > +++ b/drivers/devfreq/governor_powersave.c > @@ -23,14 +23,22 @@ static int devfreq_powersave_func(struct devfreq *df, > return 0; > } > > -static int powersave_init(struct devfreq *devfreq) > +static int devfreq_powersave_handler(struct devfreq *devfreq, > + unsigned int event, void *data) > { > - return update_devfreq(devfreq); > + int ret = 0; > + > + if (event == DEVFREQ_GOV_START) { > + mutex_lock(&devfreq->lock); > + ret = update_devfreq(devfreq); > + mutex_unlock(&devfreq->lock); > + } > + > + return ret; > } > > const struct devfreq_governor devfreq_powersave = { > .name = "powersave", > - .init = powersave_init, > .get_target_freq = devfreq_powersave_func, > - .no_central_polling = true, > + .event_handler = devfreq_powersave_handler, > }; > diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c > index a2e3eae..cf94218 100644 > --- a/drivers/devfreq/governor_simpleondemand.c > +++ b/drivers/devfreq/governor_simpleondemand.c > @@ -12,6 +12,7 @@ > #include <linux/errno.h> > #include <linux/devfreq.h> > #include <linux/math64.h> > +#include "governor.h" > > /* Default constants for DevFreq-Simple-Ondemand (DFSO) */ > #define DFSO_UPTHRESHOLD (90) > @@ -88,7 +89,30 @@ static int devfreq_simple_ondemand_func(struct devfreq *df, > return 0; > } > > +int devfreq_simple_ondemand_handler(struct devfreq *devfreq, > + unsigned int event, void *data) > +{ > + switch (event) { > + case DEVFREQ_GOV_START: > + devfreq_monitor_start(devfreq); > + break; > + > + case DEVFREQ_GOV_STOP: > + devfreq_monitor_stop(devfreq); > + break; > + > + case DEVFREQ_GOV_INTERVAL: > + devfreq_interval_update(devfreq, (unsigned int *)data); > + break; > + default: > + break; > + } > + > + return 0; > +} > + > const struct devfreq_governor devfreq_simple_ondemand = { > .name = "simple_ondemand", > .get_target_freq = devfreq_simple_ondemand_func, > + .event_handler = devfreq_simple_ondemand_handler, > }; > diff --git a/drivers/devfreq/governor_userspace.c b/drivers/devfreq/governor_userspace.c > index 0681246..1fddee5 100644 > --- a/drivers/devfreq/governor_userspace.c > +++ b/drivers/devfreq/governor_userspace.c > @@ -116,10 +116,27 @@ static void userspace_exit(struct devfreq *devfreq) > devfreq->data = NULL; > } > > +int devfreq_userspace_handler(struct devfreq *devfreq, > + unsigned int event, void *data) > +{ > + int ret = 0; > + > + switch (event) { > + case DEVFREQ_GOV_START: > + ret = userspace_init(devfreq); > + break; > + case DEVFREQ_GOV_STOP: > + userspace_exit(devfreq); > + break; > + default: > + break; > + } > + > + return ret; > +} > + > const struct devfreq_governor devfreq_userspace = { > .name = "userspace", > .get_target_freq = devfreq_userspace_func, > - .init = userspace_init, > - .exit = userspace_exit, > - .no_central_polling = true, > + .event_handler = devfreq_userspace_handler, > }; > diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h > index 281c72a..9cdffde 100644 > --- a/include/linux/devfreq.h > +++ b/include/linux/devfreq.h > @@ -91,25 +91,18 @@ struct devfreq_dev_profile { > * status of the device (load = busy_time / total_time). > * If no_central_polling is set, this callback is called > * only with update_devfreq() notified by OPP. > - * @init Called when the devfreq is being attached to a device > - * @exit Called when the devfreq is being removed from a > - * device. Governor should stop any internal routines > - * before return because related data may be > - * freed after exit(). > - * @no_central_polling Do not use devfreq's central polling mechanism. > - * When this is set, devfreq will not call > - * get_target_freq with devfreq_monitor(). However, > - * devfreq will call get_target_freq with > - * devfreq_update() notified by OPP framework. > + * @event_handler Callback for devfreq core framework to notify events > + * to governors. Events include per device governor > + * init and exit, opp changes out of devfreq, suspend > + * and resume of per device devfreq during device idle. > * > * Note that the callbacks are called with devfreq->lock locked by devfreq. > */ > struct devfreq_governor { > const char name[DEVFREQ_NAME_LEN]; > int (*get_target_freq)(struct devfreq *this, unsigned long *freq); > - int (*init)(struct devfreq *this); > - void (*exit)(struct devfreq *this); > - const bool no_central_polling; > + int (*event_handler)(struct devfreq *devfreq, > + unsigned int event, void *data); > }; > > /** > @@ -124,18 +117,13 @@ struct devfreq_governor { > * @nb notifier block used to notify devfreq object that it should > * reevaluate operable frequencies. Devfreq users may use > * devfreq.nb to the corresponding register notifier call chain. > - * @polling_jiffies interval in jiffies. > + * @work delayed work for load monitoring. > * @previous_freq previously configured frequency value. > - * @next_polling the number of remaining jiffies to poll with > - * "devfreq_monitor" executions to reevaluate > - * frequency/voltage of the device. Set by > - * profile's polling_ms interval. > * @data Private data of the governor. The devfreq framework does not > * touch this. > - * @being_removed a flag to mark that this object is being removed in > - * order to prevent trying to remove the object multiple times. > * @min_freq Limit minimum frequency requested by user (0: none) > * @max_freq Limit maximum frequency requested by user (0: none) > + * @stop_polling devfreq polling status of a device. > * > * This structure stores the devfreq information for a give device. > * > @@ -153,17 +141,15 @@ struct devfreq { > struct devfreq_dev_profile *profile; > const struct devfreq_governor *governor; > struct notifier_block nb; > + struct delayed_work work; > > - unsigned long polling_jiffies; > unsigned long previous_freq; > - unsigned int next_polling; > > void *data; /* private data for governors */ > > - bool being_removed; > - > unsigned long min_freq; > unsigned long max_freq; > + bool stop_polling; > }; > > #if defined(CONFIG_PM_DEVFREQ) > -- > 1.7.11.3 > > > > > > > >

13 years

ANN: people.linaro.org going down for 30 min, Thursday at 19:00UTC

by Fathi Boudra

Hi All, There's a scheduled downtime for 30 min, tomorrow (Thursday) at 19:00UTC. We plan to increase the disk space available on people.linaro.org. Thanks. Cheers, -- Fathi Boudra Linaro Release Manager | LAVA Project Manager Linaro.org | Open source software for ARM SoCs

13 years

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