linaro-dev

linaro-dev@lists.linaro.org

4332 discussions

Re: [PATCH 1/5] cpufreq: handle SW coordinated CPUs

by Viresh Kumar

I am starting to follow cpufreq patches religiously now and so have to come back to this old thread due to some crash we got :) Its still not pushed upstream, so better to get it resolved before 3.9. On Thu, Dec 27, 2012 at 8:25 PM, Fabio Baltieri <fabio.baltieri(a)linaro.org> wrote: > diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c > static inline void dbs_timer_init(struct dbs_data *dbs_data, > - struct cpu_dbs_common_info *cdbs, unsigned int sampling_rate) > + struct cpu_dbs_common_info *cdbs, > + unsigned int sampling_rate, > + int cpu) > { > int delay = delay_for_sampling_rate(sampling_rate); > + struct cpu_dbs_common_info *cdbs_local = dbs_data->get_cpu_cdbs(cpu); I couldn't understand the real need for this, as it should really give back the same pointer pointed out by: cdbs and hence no need of cpu in params too.. I may be wrong here :) > > - INIT_DEFERRABLE_WORK(&cdbs->work, dbs_data->gov_dbs_timer); > - schedule_delayed_work_on(cdbs->cpu, &cdbs->work, delay); > + schedule_delayed_work_on(cpu, &cdbs_local->work, delay); > } > > static inline void dbs_timer_exit(struct cpu_dbs_common_info *cdbs) > @@ -217,6 +227,10 @@ int cpufreq_governor_dbs(struct dbs_data *dbs_data, > if (ignore_nice) > j_cdbs->prev_cpu_nice = > kcpustat_cpu(j).cpustat[CPUTIME_NICE]; > + > + mutex_init(&j_cdbs->timer_mutex); > + INIT_DEFERRABLE_WORK(&j_cdbs->work, > + dbs_data->gov_dbs_timer); > } > > /* > @@ -275,15 +289,33 @@ second_time: > } > mutex_unlock(&dbs_data->mutex); > > - mutex_init(&cpu_cdbs->timer_mutex); > - dbs_timer_init(dbs_data, cpu_cdbs, *sampling_rate); > + if (dbs_sw_coordinated_cpus(cpu_cdbs)) { > + for_each_cpu(j, policy->cpus) { > + struct cpu_dbs_common_info *j_cdbs; > + > + j_cdbs = dbs_data->get_cpu_cdbs(j); > + dbs_timer_init(dbs_data, j_cdbs, > + *sampling_rate, j); > + } > + } else { > + dbs_timer_init(dbs_data, cpu_cdbs, *sampling_rate, cpu); > + } do you really need this else part? In case of uniprocessor systems also, the if block should be enough. Isn't it? > break; > > case CPUFREQ_GOV_STOP: > if (dbs_data->governor == GOV_CONSERVATIVE) > cs_dbs_info->enable = 0; > > - dbs_timer_exit(cpu_cdbs); > + if (dbs_sw_coordinated_cpus(cpu_cdbs)) { > + for_each_cpu(j, policy->cpus) { > + struct cpu_dbs_common_info *j_cdbs; > + > + j_cdbs = dbs_data->get_cpu_cdbs(j); > + dbs_timer_exit(j_cdbs); > + } > + } else { > + dbs_timer_exit(cpu_cdbs); > + } ditto. > mutex_lock(&dbs_data->mutex); > mutex_destroy(&cpu_cdbs->timer_mutex); > diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h > index f661654..5bf6fb8 100644 > --- a/drivers/cpufreq/cpufreq_governor.h > +++ b/drivers/cpufreq/cpufreq_governor.h > @@ -171,6 +171,7 @@ static inline int delay_for_sampling_rate(unsigned int sampling_rate) > > u64 get_cpu_idle_time(unsigned int cpu, u64 *wall); > void dbs_check_cpu(struct dbs_data *dbs_data, int cpu); > +bool dbs_sw_coordinated_cpus(struct cpu_dbs_common_info *cdbs); > int cpufreq_governor_dbs(struct dbs_data *dbs_data, > struct cpufreq_policy *policy, unsigned int event); > #endif /* _CPUFREQ_GOVERNER_H */ > diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c > index 7731f7c..93bb56d 100644 > --- a/drivers/cpufreq/cpufreq_ondemand.c > +++ b/drivers/cpufreq/cpufreq_ondemand.c > @@ -243,7 +243,8 @@ static void od_dbs_timer(struct work_struct *work) > } > } > > - schedule_delayed_work_on(cpu, &dbs_info->cdbs.work, delay); > + schedule_delayed_work_on(smp_processor_id(), &dbs_info->cdbs.work, > + delay); > mutex_unlock(&dbs_info->cdbs.timer_mutex); > } > > -- > 1.7.12.1 > > -- > To unsubscribe from this list: send the line "unsubscribe cpufreq" in > the body of a message to majordomo(a)vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html

13 years

[PATCH] ARM: ux500: rename ab8500 to abx500 for hwmon driver

by Hongbo Zhang

We are using a generic abx500 hwmon layer, so rename specific ab8500 to generic abx500 for hwmon device and driver matching. Signed-off-by: Hongbo Zhang <hongbo.zhang(a)linaro.org> --- drivers/mfd/ab8500-core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c index e1650ba..579753f 100644 --- a/drivers/mfd/ab8500-core.c +++ b/drivers/mfd/ab8500-core.c @@ -922,7 +922,7 @@ static struct resource ab8505_iddet_resources[] = { static struct resource ab8500_temp_resources[] = { { - .name = "AB8500_TEMP_WARM", + .name = "ABX500_TEMP_WARM", .start = AB8500_INT_TEMP_WARM, .end = AB8500_INT_TEMP_WARM, .flags = IORESOURCE_IRQ, @@ -998,8 +998,8 @@ static struct mfd_cell abx500_common_devs[] = { .of_compatible = "stericsson,ab8500-denc", }, { - .name = "ab8500-temp", - .of_compatible = "stericsson,ab8500-temp", + .name = "abx500-temp", + .of_compatible = "stericsson,abx500-temp", .num_resources = ARRAY_SIZE(ab8500_temp_resources), .resources = ab8500_temp_resources, }, -- 1.8.0

13 years

[PATCH] ARM: ux500: enable ux500 EXT4_FS and LBDAF support by default

by Hongbo Zhang

EXT4 file system and LBDAF are used commonly, should be enabled by default. Signed-off-by: Hongbo Zhang <hongbo.zhang(a)linaro.org> --- arch/arm/configs/u8500_defconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/configs/u8500_defconfig b/arch/arm/configs/u8500_defconfig index 231dca6..746c8a2 100644 --- a/arch/arm/configs/u8500_defconfig +++ b/arch/arm/configs/u8500_defconfig @@ -5,7 +5,6 @@ CONFIG_BLK_DEV_INITRD=y CONFIG_KALLSYMS_ALL=y CONFIG_MODULES=y CONFIG_MODULE_UNLOAD=y -# CONFIG_LBDAF is not set # CONFIG_BLK_DEV_BSG is not set CONFIG_ARCH_U8500=y CONFIG_MACH_HREFV60=y @@ -103,6 +102,7 @@ CONFIG_EXT2_FS_XATTR=y CONFIG_EXT2_FS_POSIX_ACL=y CONFIG_EXT2_FS_SECURITY=y CONFIG_EXT3_FS=y +CONFIG_EXT4_FS=y CONFIG_VFAT_FS=y CONFIG_TMPFS=y CONFIG_TMPFS_POSIX_ACL=y -- 1.8.0

13 years

[PATCH] hwmon: add ST-Ericsson ABX500 hwmon driver

by Hongbo Zhang

Each of ST-Ericsson X500 chip set series consists of both ABX500 and DBX500 chips. This is ABX500 hwmon driver, where the abx500.c is a common layer for all ABX500s, and the ab8500.c is specific for AB8500 chip. Under this designed structure, other chip specific files can be added simply using the same common layer abx500.c. Signed-off-by: Hongbo Zhang <hongbo.zhang(a)linaro.org> --- drivers/hwmon/Kconfig | 13 + drivers/hwmon/Makefile | 1 + drivers/hwmon/ab8500.c | 160 ++++++++++++ drivers/hwmon/abx500.c | 681 +++++++++++++++++++++++++++++++++++++++++++++++++ drivers/hwmon/abx500.h | 88 +++++++ 5 files changed, 943 insertions(+) create mode 100644 drivers/hwmon/ab8500.c create mode 100644 drivers/hwmon/abx500.c create mode 100644 drivers/hwmon/abx500.h diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 32f238f..0a6fd21 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -39,6 +39,19 @@ config HWMON_DEBUG_CHIP comment "Native drivers" +config SENSORS_AB8500 + tristate "AB8500 thermal monitoring" + depends on AB8500_GPADC + default n + help + If you say yes here you get support for the thermal sensor part + of the AB8500 chip. The driver includes thermal management for + AB8500 die and two GPADC channels. The GPADC channel are preferably + used to access sensors outside the AB8500 chip. + + This driver can also be built as a module. If so, the module + will be called abx500-temp. + config SENSORS_ABITUGURU tristate "Abit uGuru (rev 1 & 2)" depends on X86 && DMI diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 5da2874..06dfe85 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_SENSORS_W83795) += w83795.o obj-$(CONFIG_SENSORS_W83781D) += w83781d.o obj-$(CONFIG_SENSORS_W83791D) += w83791d.o +obj-$(CONFIG_SENSORS_AB8500) += abx500.o ab8500.o obj-$(CONFIG_SENSORS_ABITUGURU) += abituguru.o obj-$(CONFIG_SENSORS_ABITUGURU3)+= abituguru3.o obj-$(CONFIG_SENSORS_AD7314) += ad7314.o diff --git a/drivers/hwmon/ab8500.c b/drivers/hwmon/ab8500.c new file mode 100644 index 0000000..426872c --- /dev/null +++ b/drivers/hwmon/ab8500.c @@ -0,0 +1,160 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * Author: Martin Persson <martin.persson(a)stericsson.com> for + * ST-Ericsson. + * License Terms: GNU General Public License v2 + * + * If/when the AB8500 thermal warning temperature is reached (threshold cannot + * be changed by SW), an interrupt is set and the driver notifies user space + * via a sysfs event. If a shut down is not triggered by user space within a + * certain time frame, pm_power off is called. + * + * If/when AB8500 thermal shutdown temperature is reached a hardware shutdown + * of the AB8500 will occur. + */ + +#include <linux/err.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/mfd/abx500/ab8500-bm.h> +#include <linux/mfd/abx500/ab8500-gpadc.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include "abx500.h" + +#define DEFAULT_POWER_OFF_DELAY 10000 + +/* The driver monitors GPADC - ADC_AUX1, ADC_AUX2, BTEMP_BALL and BAT_CTRL */ +#define NUM_MONITORED_SENSORS 4 + +static int ab8500_read_sensor(struct abx500_temp *data, u8 sensor) +{ + int val; + /* + * Special treatment for the BAT_CTRL node, since this temperature + * measurement is more complex than just an ADC readout + */ + if (sensor == BAT_CTRL) + val = ab8500_btemp_get_batctrl_temp(data->ab8500_btemp); + else + val = ab8500_gpadc_convert(data->ab8500_gpadc, sensor); + + return val; +} + +static void ab8500_thermal_power_off(struct work_struct *work) +{ + struct abx500_temp *data = container_of(work, struct abx500_temp, + power_off_work.work); + + dev_warn(&data->pdev->dev, + "Power off due to AB8500 thermal warning.\n"); + pm_power_off(); +} + +static ssize_t ab8500_show_name(struct device *dev, + struct device_attribute *devattr, + char *buf) +{ + return sprintf(buf, "ab8500\n"); +} + +static ssize_t ab8500_show_label(struct device *dev, + struct device_attribute *devattr, + char *buf) +{ + char *name; + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + int index = attr->index; + + switch (index) { + case 1: + name = "ext_rtc_xtal"; + break; + case 2: + name = "ext_db8500"; + break; + case 3: + name = "bat_temp"; + break; + case 4: + name = "bat_ctrl"; + break; + case 5: + name = "ab8500"; + break; + default: + return -EINVAL; + } + return sprintf(buf, "%s\n", name); +} + +static int ab8500_is_visible(struct attribute *attr, int n) +{ + if (!strcmp(attr->name, "temp5_input") || + !strcmp(attr->name, "temp5_min") || + !strcmp(attr->name, "temp5_max") || + !strcmp(attr->name, "temp5_max_hyst") || + !strcmp(attr->name, "temp5_min_alarm") || + !strcmp(attr->name, "temp5_max_alarm") || + !strcmp(attr->name, "temp5_max_hyst_alarm")) + return 0; + + return attr->mode; +} + +static int ab8500_temp_irq_handler(int irq, struct abx500_temp *data) +{ + unsigned long delay_in_jiffies; + + mutex_lock(&data->lock); + data->crit_alarm[4] = 1; + mutex_unlock(&data->lock); + + sysfs_notify(&data->pdev->dev.kobj, NULL, "temp5_crit_alarm"); + dev_info(&data->pdev->dev, "AB8500 warning, power off in %lu s\n", + data->power_off_delay); + delay_in_jiffies = msecs_to_jiffies(data->power_off_delay); + schedule_delayed_work(&data->power_off_work, delay_in_jiffies); + return 0; +} + +int abx500_hwmon_init(struct abx500_temp *data) +{ + data->ab8500_gpadc = ab8500_gpadc_get("ab8500-gpadc.0"); + if (IS_ERR(data->ab8500_gpadc)) + return PTR_ERR(data->ab8500_gpadc); + + data->ab8500_btemp = ab8500_btemp_get(); + if (IS_ERR(data->ab8500_btemp)) + return PTR_ERR(data->ab8500_btemp); + + INIT_DELAYED_WORK(&data->power_off_work, ab8500_thermal_power_off); + + /* + * Reference hardware: + * GPADC - ADC_AUX1, connected to NTC R2148 + * GPADC - ADC_AUX2, connected to NTC R2150 + * Hence temp#_min/max/max_hyst refer to millivolts, not millidegrees + * This is not the case for BAT_CTRL where millidegrees is used + * + * Reading AB8500 temperature is not supportted. BUT an AB8500 IRQ + * will be launched if die crit temp limit is reached. + */ + data->gpadc_addr[0] = ADC_AUX1; + data->gpadc_addr[1] = ADC_AUX2; + data->gpadc_addr[2] = BTEMP_BALL; + data->gpadc_addr[3] = BAT_CTRL; + data->gpadc_addr[4] = DIE_TEMP; + data->power_off_delay = DEFAULT_POWER_OFF_DELAY; + data->monitored_sensors = NUM_MONITORED_SENSORS; + + data->ops.read_sensor = ab8500_read_sensor; + data->ops.irq_handler = ab8500_temp_irq_handler; + data->ops.show_name = ab8500_show_name; + data->ops.show_label = ab8500_show_label; + data->ops.is_visible = ab8500_is_visible; + + return 0; +} diff --git a/drivers/hwmon/abx500.c b/drivers/hwmon/abx500.c new file mode 100644 index 0000000..94cffd4 --- /dev/null +++ b/drivers/hwmon/abx500.c @@ -0,0 +1,681 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * Author: Martin Persson <martin.persson(a)stericsson.com> for + * ST-Ericsson. + * License Terms: GNU General Public License v2 + * + * ABX500 does not provide auto ADC, so to monitor the required temperatures, + * a periodic work is used. It is more important to not wake up the CPU than + * to perform this job, hence the use of a deferred delay. + * + * A deferred delay for thermal monitor is considered safe because: + * If the chip gets too hot during a sleep state it's most likely due to + * external factors, such as the surrounding temperature. I.e. no SW decisions + * will make any difference. + * + * If/when the ABX500 thermal warning temperature is reached (threshold cannot + * be changed by SW), an interrupt is set and the driver notifies user space + * via a sysfs event. + * + * If/when ABX500 thermal shutdown temperature is reached a hardware shutdown + * of the ABX500 will occur. + */ + +#include <linux/err.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/interrupt.h> +#include <linux/jiffies.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/workqueue.h> +#include "abx500.h" + +#define DEFAULT_MONITOR_DELAY 1000 + +/* + * Thresholds are considered inactive if set to 0. To avoid confusion for user + * space applications, the temp monitor delay is set with the default value if + * all thresholds are 0. + */ +static bool find_active_thresholds(struct abx500_temp *data) +{ + int i; + for (i = 0; i < data->monitored_sensors; i++) + if (data->max[i] != 0 || data->max_hyst[i] != 0 + || data->min[i] != 0) + return true; + + dev_dbg(&data->pdev->dev, "No active thresholds.\n"); + cancel_delayed_work_sync(&data->work); + data->work_active = false; + data->gpadc_monitor_delay = DEFAULT_MONITOR_DELAY; + return false; +} + +static inline void schedule_monitor(struct abx500_temp *data) +{ + unsigned long delay_in_jiffies; + delay_in_jiffies = msecs_to_jiffies(data->gpadc_monitor_delay); + data->work_active = true; + schedule_delayed_work(&data->work, delay_in_jiffies); +} + +static inline void gpadc_monitor_exit(struct abx500_temp *data) +{ + cancel_delayed_work_sync(&data->work); + data->work_active = false; +} + +static void gpadc_monitor(struct work_struct *work) +{ + unsigned long delay_in_jiffies; + int val, i, ret; + char alarm_node[30]; + bool updated_min_alarm = false; + bool updated_max_alarm = false; + bool updated_max_hyst_alarm = false; + struct abx500_temp *data = container_of(work, struct abx500_temp, + work.work); + + for (i = 0; i < data->monitored_sensors; i++) { + /* Thresholds are considered inactive if set to 0 */ + if (data->max[i] == 0 && data->max_hyst[i] == 0 + && data->min[i] == 0) + continue; + + val = data->ops.read_sensor(data, data->gpadc_addr[i]); + if (val < 0) { + dev_err(&data->pdev->dev, "GPADC read failed\n"); + continue; + } + + mutex_lock(&data->lock); + if (data->min[i] != 0) { + if (val < data->min[i]) { + if (data->min_alarm[i] == 0) { + data->min_alarm[i] = 1; + updated_min_alarm = true; + } + } else { + if (data->min_alarm[i] == 1) { + data->min_alarm[i] = 0; + updated_min_alarm = true; + } + } + + } + if (data->max[i] != 0) { + if (val > data->max[i]) { + if (data->max_alarm[i] == 0) { + data->max_alarm[i] = 1; + updated_max_alarm = true; + } + } else { + if (data->max_alarm[i] == 1) { + data->max_alarm[i] = 0; + updated_max_alarm = true; + } + } + + } + if (data->max_hyst[i] != 0) { + if (val > data->max_hyst[i]) { + if (data->max_hyst_alarm[i] == 0) { + data->max_hyst_alarm[i] = 1; + updated_max_hyst_alarm = true; + } + } else { + if (data->max_hyst_alarm[i] == 1) { + data->max_hyst_alarm[i] = 0; + updated_max_hyst_alarm = true; + } + } + } + mutex_unlock(&data->lock); + + /* hwmon attr index starts at 1, thus "i+1" below */ + if (updated_min_alarm) { + ret = sprintf(alarm_node, "temp%d_min_alarm", (i + 1)); + sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node); + } + if (updated_max_alarm) { + ret = sprintf(alarm_node, "temp%d_max_alarm", (i + 1)); + sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node); + } + if (updated_max_hyst_alarm) { + ret = sprintf(alarm_node, "temp%d_max_hyst_alarm", + (i + 1)); + sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node); + } + } + + delay_in_jiffies = msecs_to_jiffies(data->gpadc_monitor_delay); + data->work_active = true; + schedule_delayed_work(&data->work, delay_in_jiffies); +} + +static ssize_t set_temp_monitor_delay(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + int res; + unsigned long delay_in_s; + struct abx500_temp *data = dev_get_drvdata(dev); + + res = kstrtoul(buf, 10, &delay_in_s); + if (res < 0) + return res; + + mutex_lock(&data->lock); + data->gpadc_monitor_delay = delay_in_s * 1000; + + if (find_active_thresholds(data)) + schedule_monitor(data); + + mutex_unlock(&data->lock); + + return count; +} + +static ssize_t set_temp_power_off_delay(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + int res; + unsigned long delay_in_s; + struct abx500_temp *data = dev_get_drvdata(dev); + + res = kstrtoul(buf, 10, &delay_in_s); + if (res < 0) + return res; + + mutex_lock(&data->lock); + data->power_off_delay = delay_in_s * 1000; + mutex_unlock(&data->lock); + + return count; +} + +static ssize_t show_temp_monitor_delay(struct device *dev, + struct device_attribute *devattr, + char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + /* return time in s, not ms */ + return sprintf(buf, "%lu\n", (data->gpadc_monitor_delay) / 1000); +} + +static ssize_t show_temp_power_off_delay(struct device *dev, + struct device_attribute *devattr, + char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + /* return time in s, not ms */ + return sprintf(buf, "%lu\n", (data->power_off_delay) / 1000); +} + +/* + * HWMON sysfs interfaces + * For all the below set and show functions, the hwmon attr index starts at 1, + * thus "attr->index-1" is used. + */ +static ssize_t show_name(struct device *dev, struct device_attribute *devattr, + char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + /* Show chip name */ + return data->ops.show_name(dev, devattr, buf); +} + +static ssize_t show_label(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + /* Show each sensor label */ + return data->ops.show_label(dev, devattr, buf); +} + +static ssize_t show_input(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int val; + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + u8 gpadc_addr = data->gpadc_addr[attr->index - 1]; + + val = data->ops.read_sensor(data, gpadc_addr); + if (val < 0) + dev_err(&data->pdev->dev, "GPADC read failed\n"); + + return sprintf(buf, "%d\n", val); +} + +/* + * Set functions (RW nodes) + * For all the set functions, threshold is considered inactive if set to 0 + */ +static ssize_t set_min(struct device *dev, struct device_attribute *devattr, + const char *buf, size_t count) +{ + unsigned long val; + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + int res = kstrtoul(buf, 10, &val); + if (res < 0) + return res; + + mutex_lock(&data->lock); + + if (val == 0) + data->min_alarm[attr->index - 1] = 0; + + data->min[attr->index - 1] = val; + + if (val == 0) + (void) find_active_thresholds(data); + else + schedule_monitor(data); + + mutex_unlock(&data->lock); + + return count; +} + +static ssize_t set_max(struct device *dev, struct device_attribute *devattr, + const char *buf, size_t count) +{ + unsigned long val; + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + int res = kstrtoul(buf, 10, &val); + if (res < 0) + return res; + + mutex_lock(&data->lock); + + if (val == 0) + data->max_alarm[attr->index - 1] = 0; + + data->max[attr->index - 1] = val; + + if (val == 0) + (void) find_active_thresholds(data); + else + schedule_monitor(data); + + mutex_unlock(&data->lock); + + return count; +} + +static ssize_t set_max_hyst(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + unsigned long val; + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + int res = kstrtoul(buf, 10, &val); + if (res < 0) + return res; + + mutex_lock(&data->lock); + + if (val == 0) + data->max_hyst_alarm[attr->index - 1] = 0; + + data->max_hyst[attr->index - 1] = val; + + if (val == 0) + (void) find_active_thresholds(data); + else + schedule_monitor(data); + + mutex_unlock(&data->lock); + + return count; +} + +/* Show functions (RO nodes) */ +static ssize_t show_min(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + + return sprintf(buf, "%ld\n", data->min[attr->index - 1]); +} + +static ssize_t show_max(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + + return sprintf(buf, "%ld\n", data->max[attr->index - 1]); +} + +static ssize_t show_max_hyst(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + + return sprintf(buf, "%ld\n", data->max_hyst[attr->index - 1]); +} + +static ssize_t show_min_alarm(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + + return sprintf(buf, "%ld\n", data->min_alarm[attr->index - 1]); +} + +static ssize_t show_max_alarm(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + + return sprintf(buf, "%ld\n", data->max_alarm[attr->index - 1]); +} + +static ssize_t show_max_hyst_alarm(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + + return sprintf(buf, "%ld\n", data->max_hyst_alarm[attr->index - 1]); +} + +static ssize_t show_crit_alarm(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct abx500_temp *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + + return sprintf(buf, "%ld\n", data->crit_alarm[attr->index - 1]); +} + +static mode_t abx500_attrs_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct abx500_temp *data = dev_get_drvdata(dev); + + return data->ops.is_visible(a, n); +} + +static SENSOR_DEVICE_ATTR(temp_monitor_delay, S_IRUGO | S_IWUSR, + show_temp_monitor_delay, set_temp_monitor_delay, 0); +static SENSOR_DEVICE_ATTR(temp_power_off_delay, S_IRUGO | S_IWUSR, + show_temp_power_off_delay, + set_temp_power_off_delay, 0); + +/* Chip name, required by hwmon*/ +static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); + +/* GPADC - SENSOR1 */ +static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL, 1); +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 1); +static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_min, set_min, 1); +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_max, set_max, 1); +static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, + show_max_hyst, set_max_hyst, 1); +static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_min_alarm, NULL, 1); +static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_max_alarm, NULL, 1); +static SENSOR_DEVICE_ATTR(temp1_max_hyst_alarm, S_IRUGO, + show_max_hyst_alarm, NULL, 1); + +/* GPADC - SENSOR2 */ +static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, 2); +static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2); +static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min, set_min, 2); +static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max, 2); +static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IWUSR | S_IRUGO, + show_max_hyst, set_max_hyst, 2); +static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_min_alarm, NULL, 2); +static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_max_alarm, NULL, 2); +static SENSOR_DEVICE_ATTR(temp2_max_hyst_alarm, S_IRUGO, + show_max_hyst_alarm, NULL, 2); + +/* GPADC - SENSOR3 */ +static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, show_label, NULL, 3); +static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 3); +static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min, set_min, 3); +static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max, 3); +static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IWUSR | S_IRUGO, + show_max_hyst, set_max_hyst, 3); +static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_min_alarm, NULL, 3); +static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_max_alarm, NULL, 3); +static SENSOR_DEVICE_ATTR(temp3_max_hyst_alarm, S_IRUGO, + show_max_hyst_alarm, NULL, 3); + +/* GPADC - SENSOR4 */ +static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, show_label, NULL, 4); +static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_input, NULL, 4); +static SENSOR_DEVICE_ATTR(temp4_min, S_IWUSR | S_IRUGO, show_min, set_min, 4); +static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_max, set_max, 4); +static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IWUSR | S_IRUGO, + show_max_hyst, set_max_hyst, 4); +static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_min_alarm, NULL, 4); +static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_max_alarm, NULL, 4); +static SENSOR_DEVICE_ATTR(temp4_max_hyst_alarm, S_IRUGO, + show_max_hyst_alarm, NULL, 4); + +/* GPADC - SENSOR5 */ +static SENSOR_DEVICE_ATTR(temp5_label, S_IRUGO, show_label, NULL, 5); +static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_input, NULL, 5); +static SENSOR_DEVICE_ATTR(temp5_min, S_IWUSR | S_IRUGO, show_min, set_min, 5); +static SENSOR_DEVICE_ATTR(temp5_max, S_IWUSR | S_IRUGO, show_max, set_max, 5); +static SENSOR_DEVICE_ATTR(temp5_max_hyst, S_IWUSR | S_IRUGO, + show_max_hyst, set_max_hyst, 5); +static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO, show_min_alarm, NULL, 5); +static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_max_alarm, NULL, 5); +static SENSOR_DEVICE_ATTR(temp5_max_hyst_alarm, S_IRUGO, + show_max_hyst_alarm, NULL, 5); +static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, + show_crit_alarm, NULL, 5); + +struct attribute *abx500_temp_attributes[] = { + &sensor_dev_attr_name.dev_attr.attr, + &sensor_dev_attr_temp_monitor_delay.dev_attr.attr, + &sensor_dev_attr_temp_power_off_delay.dev_attr.attr, + /* GPADC SENSOR1 */ + &sensor_dev_attr_temp1_label.dev_attr.attr, + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_temp1_min.dev_attr.attr, + &sensor_dev_attr_temp1_max.dev_attr.attr, + &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, + &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp1_max_hyst_alarm.dev_attr.attr, + /* GPADC SENSOR2 */ + &sensor_dev_attr_temp2_label.dev_attr.attr, + &sensor_dev_attr_temp2_input.dev_attr.attr, + &sensor_dev_attr_temp2_min.dev_attr.attr, + &sensor_dev_attr_temp2_max.dev_attr.attr, + &sensor_dev_attr_temp2_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, + &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp2_max_hyst_alarm.dev_attr.attr, + /* GPADC SENSOR3 */ + &sensor_dev_attr_temp3_label.dev_attr.attr, + &sensor_dev_attr_temp3_input.dev_attr.attr, + &sensor_dev_attr_temp3_min.dev_attr.attr, + &sensor_dev_attr_temp3_max.dev_attr.attr, + &sensor_dev_attr_temp3_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp3_min_alarm.dev_attr.attr, + &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp3_max_hyst_alarm.dev_attr.attr, + /* GPADC SENSOR4 */ + &sensor_dev_attr_temp4_label.dev_attr.attr, + &sensor_dev_attr_temp4_input.dev_attr.attr, + &sensor_dev_attr_temp4_min.dev_attr.attr, + &sensor_dev_attr_temp4_max.dev_attr.attr, + &sensor_dev_attr_temp4_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp4_min_alarm.dev_attr.attr, + &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp4_max_hyst_alarm.dev_attr.attr, + /* GPADC SENSOR5*/ + &sensor_dev_attr_temp5_label.dev_attr.attr, + &sensor_dev_attr_temp5_input.dev_attr.attr, + &sensor_dev_attr_temp5_min.dev_attr.attr, + &sensor_dev_attr_temp5_max.dev_attr.attr, + &sensor_dev_attr_temp5_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp5_min_alarm.dev_attr.attr, + &sensor_dev_attr_temp5_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp5_max_hyst_alarm.dev_attr.attr, + &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr, + NULL +}; + +static const struct attribute_group abx500_temp_group = { + .attrs = abx500_temp_attributes, + .is_visible = abx500_attrs_visible, +}; + +static irqreturn_t abx500_temp_irq_handler(int irq, void *irq_data) +{ + struct platform_device *pdev = irq_data; + struct abx500_temp *data = platform_get_drvdata(pdev); + + data->ops.irq_handler(irq, data); + return IRQ_HANDLED; +} + +static int setup_irqs(struct platform_device *pdev) +{ + int ret; + int irq = platform_get_irq_byname(pdev, "ABX500_TEMP_WARM"); + + if (irq < 0) { + dev_err(&pdev->dev, "Get irq by name failed\n"); + return irq; + } + + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + abx500_temp_irq_handler, IRQF_NO_SUSPEND, "abx500-temp", pdev); + if (ret < 0) + dev_err(&pdev->dev, "Request threaded irq failed (%d)\n", ret); + + return ret; +} + +static int abx500_temp_probe(struct platform_device *pdev) +{ + struct abx500_temp *data; + int err; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->pdev = pdev; + mutex_init(&data->lock); + + /* Chip specific initialization */ + err = abx500_hwmon_init(data); + if (err < 0 || !data->ops.read_sensor || !data->ops.irq_handler + || !data->ops.show_name || !data->ops.show_label + || !data->ops.is_visible) { + dev_err(&pdev->dev, "ABx500 hwmon init failed"); + return err; + } + + data->hwmon_dev = hwmon_device_register(&pdev->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + dev_err(&pdev->dev, "Class registration failed (%d)\n", err); + return err; + } + + INIT_DEFERRABLE_WORK(&data->work, gpadc_monitor); + data->gpadc_monitor_delay = DEFAULT_MONITOR_DELAY; + + platform_set_drvdata(pdev, data); + + err = sysfs_create_group(&pdev->dev.kobj, &abx500_temp_group); + if (err < 0) { + dev_err(&pdev->dev, "Create sysfs group failed (%d)\n", err); + goto exit_platform_data; + } + + err = setup_irqs(pdev); + if (err < 0) { + dev_err(&pdev->dev, "irq setup failed (%d)\n", err); + goto exit_sysfs_group; + } + return 0; + +exit_sysfs_group: + sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group); +exit_platform_data: + platform_set_drvdata(pdev, NULL); + hwmon_device_unregister(data->hwmon_dev); + return err; +} + +static int abx500_temp_remove(struct platform_device *pdev) +{ + struct abx500_temp *data = platform_get_drvdata(pdev); + + gpadc_monitor_exit(data); + sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group); + platform_set_drvdata(pdev, NULL); + hwmon_device_unregister(data->hwmon_dev); + return 0; +} + +static int abx500_temp_suspend(struct platform_device *pdev, + pm_message_t state) +{ + struct abx500_temp *data = platform_get_drvdata(pdev); + + if (data->work_active) + cancel_delayed_work_sync(&data->work); + return 0; +} + +static int abx500_temp_resume(struct platform_device *pdev) +{ + struct abx500_temp *data = platform_get_drvdata(pdev); + + if (data->work_active) + schedule_monitor(data); + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id abx500_temp_match[] = { + { .compatible = "stericsson,abx500-temp" }, + {}, +}; +#endif + +static struct platform_driver abx500_temp_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "abx500-temp", + .of_match_table = of_match_ptr(abx500_temp_match), + }, + .suspend = abx500_temp_suspend, + .resume = abx500_temp_resume, + .probe = abx500_temp_probe, + .remove = abx500_temp_remove, +}; + +module_platform_driver(abx500_temp_driver); + +MODULE_AUTHOR("Martin Persson <martin.persson(a)stericsson.com>"); +MODULE_DESCRIPTION("ABX500 temperature driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/hwmon/abx500.h b/drivers/hwmon/abx500.h new file mode 100644 index 0000000..660a38e --- /dev/null +++ b/drivers/hwmon/abx500.h @@ -0,0 +1,88 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * License terms: GNU General Public License v2 + * Author: Martin Persson <martin.persson(a)stericsson.com> + */ + +#ifndef _ABX500_H +#define _ABX500_H + +#define NUM_SENSORS 5 + +struct ab8500_gpadc; +struct ab8500_btemp; +struct abx500_temp; + +/* + * struct abx500_temp_ops - abx500 chip specific ops + * @read_sensor: reads gpadc output + * @irq_handler: irq handler + * @show_name: hwmon device name + * @show_label: hwmon attribute label + * @is_visible: is attribute visible + */ +struct abx500_temp_ops { + int (*read_sensor)(struct abx500_temp *, u8); + int (*irq_handler)(int, struct abx500_temp *); + ssize_t (*show_name)(struct device *, + struct device_attribute *, char *); + ssize_t (*show_label) (struct device *, + struct device_attribute *, char *); + int (*is_visible)(struct attribute *, int); +}; + +/* + * struct abx500_temp - representation of temp mon device + * @pdev: platform device + * @hwmon_dev: hwmon device + * @ab8500_gpadc: gpadc interface for ab8500 + * @btemp: battery temperature interface for ab8500 + * @gpadc_addr: gpadc channel address + * @temp: sensor temperature input value + * @min: sensor temperature min value + * @max: sensor temperature max value + * @max_hyst: sensor temperature hysteresis value for max limit + * @crit: sensor temperature critical value + * @min_alarm: sensor temperature min alarm + * @max_alarm: sensor temperature max alarm + * @max_hyst_alarm: sensor temperature hysteresis alarm + * @crit_alarm: sensor temperature critical value alarm + * @work: delayed work scheduled to monitor temperature periodically + * @work_active: True if work is active + * @power_off_work: delayed work scheduled to power off the system + * when critical temperature is reached + * @lock: mutex + * @gpadc_monitor_delay: delay between temperature readings in ms + * @power_off_delay: delay before power off in ms + * @monitored_sensors: number of monitored sensors + */ +struct abx500_temp { + struct platform_device *pdev; + struct device *hwmon_dev; + struct ab8500_gpadc *ab8500_gpadc; + struct ab8500_btemp *ab8500_btemp; + struct abx500_temp_ops ops; + u8 gpadc_addr[NUM_SENSORS]; + unsigned long temp[NUM_SENSORS]; + unsigned long min[NUM_SENSORS]; + unsigned long max[NUM_SENSORS]; + unsigned long max_hyst[NUM_SENSORS]; + unsigned long crit[NUM_SENSORS]; + unsigned long min_alarm[NUM_SENSORS]; + unsigned long max_alarm[NUM_SENSORS]; + unsigned long max_hyst_alarm[NUM_SENSORS]; + unsigned long crit_alarm[NUM_SENSORS]; + struct delayed_work work; + bool work_active; + struct delayed_work power_off_work; + struct mutex lock; + /* Delay (ms) between temperature readings */ + unsigned long gpadc_monitor_delay; + /* Delay (ms) before power off */ + unsigned long power_off_delay; + int monitored_sensors; +}; + +int __init abx500_hwmon_init(struct abx500_temp *data); + +#endif /* _ABX500_H */ -- 1.8.0

13 years

[PATCH V3] cpufreq: Simplify cpufreq_add_dev()

by Viresh Kumar

Currently cpufreq_add_dev() firsts allocates policy, calls driver->init() and then checks if this cpu is already managed or not. And if it is already managed, free its policy. We can save all this if we somehow know cpu is managed or not in advance. policy->related_cpus contains list of all valid sibling cpus of policy->cpu. We can check this to know if current cpu is already managed. >From now on, platforms don't really need to set related_cpus from their init() routines, as the same work is done by core too. If platform driver needs to set the related_cpus mask with some additional cpus, other than cpus present in policy->cpus, they are free to do it as we aren't overriding anything. Signed-off-by: Viresh Kumar <viresh.kumar(a)linaro.org> Tested-by: Shawn Guo <shawn.guo(a)linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> --- V2->V3: - Set all cpus present in policy->cpus in related_cpus as well. - Remove code to set related_cpus from SPEAr cpufreq driver. drivers/cpufreq/cpufreq.c | 158 +++++++++++++++------------------------- drivers/cpufreq/spear-cpufreq.c | 1 - 2 files changed, 58 insertions(+), 101 deletions(-) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index f1bb8f8..db81382 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -554,8 +554,6 @@ static ssize_t show_cpus(const struct cpumask *mask, char *buf) */ static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) { - if (cpumask_empty(policy->related_cpus)) - return show_cpus(policy->cpus, buf); return show_cpus(policy->related_cpus, buf); } @@ -711,92 +709,6 @@ static struct kobj_type ktype_cpufreq = { .release = cpufreq_sysfs_release, }; -/* - * Returns: - * Negative: Failure - * 0: Success - * Positive: When we have a managed CPU and the sysfs got symlinked - */ -static int cpufreq_add_dev_policy(unsigned int cpu, - struct cpufreq_policy *policy, - struct device *dev) -{ - int ret = 0; -#ifdef CONFIG_SMP - unsigned long flags; - unsigned int j; -#ifdef CONFIG_HOTPLUG_CPU - struct cpufreq_governor *gov; - - gov = __find_governor(per_cpu(cpufreq_cpu_governor, cpu)); - if (gov) { - policy->governor = gov; - pr_debug("Restoring governor %s for cpu %d\n", - policy->governor->name, cpu); - } -#endif - - for_each_cpu(j, policy->cpus) { - struct cpufreq_policy *managed_policy; - - if (cpu == j) - continue; - - /* Check for existing affected CPUs. - * They may not be aware of it due to CPU Hotplug. - * cpufreq_cpu_put is called when the device is removed - * in __cpufreq_remove_dev() - */ - managed_policy = cpufreq_cpu_get(j); - if (unlikely(managed_policy)) { - - /* Set proper policy_cpu */ - unlock_policy_rwsem_write(cpu); - per_cpu(cpufreq_policy_cpu, cpu) = managed_policy->cpu; - - if (lock_policy_rwsem_write(cpu) < 0) { - /* Should not go through policy unlock path */ - if (cpufreq_driver->exit) - cpufreq_driver->exit(policy); - cpufreq_cpu_put(managed_policy); - return -EBUSY; - } - - __cpufreq_governor(managed_policy, CPUFREQ_GOV_STOP); - - spin_lock_irqsave(&cpufreq_driver_lock, flags); - cpumask_copy(managed_policy->cpus, policy->cpus); - per_cpu(cpufreq_cpu_data, cpu) = managed_policy; - spin_unlock_irqrestore(&cpufreq_driver_lock, flags); - - __cpufreq_governor(managed_policy, CPUFREQ_GOV_START); - __cpufreq_governor(managed_policy, CPUFREQ_GOV_LIMITS); - - pr_debug("CPU already managed, adding link\n"); - ret = sysfs_create_link(&dev->kobj, - &managed_policy->kobj, - "cpufreq"); - if (ret) - cpufreq_cpu_put(managed_policy); - /* - * Success. We only needed to be added to the mask. - * Call driver->exit() because only the cpu parent of - * the kobj needed to call init(). - */ - if (cpufreq_driver->exit) - cpufreq_driver->exit(policy); - - if (!ret) - return 1; - else - return ret; - } - } -#endif - return ret; -} - - /* symlink affected CPUs */ static int cpufreq_add_dev_symlink(unsigned int cpu, struct cpufreq_policy *policy) @@ -901,6 +813,42 @@ err_out_kobj_put: return ret; } +#ifdef CONFIG_HOTPLUG_CPU +static int cpufreq_add_policy_cpu(unsigned int cpu, unsigned int sibling, + struct device *dev) +{ + struct cpufreq_policy *policy; + int ret = 0; + unsigned long flags; + + policy = cpufreq_cpu_get(sibling); + WARN_ON(!policy); + + per_cpu(cpufreq_policy_cpu, cpu) = policy->cpu; + + lock_policy_rwsem_write(cpu); + + __cpufreq_governor(policy, CPUFREQ_GOV_STOP); + + spin_lock_irqsave(&cpufreq_driver_lock, flags); + cpumask_set_cpu(cpu, policy->cpus); + per_cpu(cpufreq_cpu_data, cpu) = policy; + spin_unlock_irqrestore(&cpufreq_driver_lock, flags); + + __cpufreq_governor(policy, CPUFREQ_GOV_START); + __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); + + unlock_policy_rwsem_write(cpu); + + ret = sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq"); + if (ret) { + cpufreq_cpu_put(policy); + return ret; + } + + return 0; +} +#endif /** * cpufreq_add_dev - add a CPU device @@ -913,12 +861,12 @@ err_out_kobj_put: */ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) { - unsigned int cpu = dev->id; - int ret = 0, found = 0; + unsigned int j, cpu = dev->id; + int ret = -ENOMEM, found = 0; struct cpufreq_policy *policy; unsigned long flags; - unsigned int j; #ifdef CONFIG_HOTPLUG_CPU + struct cpufreq_governor *gov; int sibling; #endif @@ -935,6 +883,15 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) cpufreq_cpu_put(policy); return 0; } + +#ifdef CONFIG_HOTPLUG_CPU + /* Check if this cpu was hot-unplugged earlier and has siblings */ + for_each_online_cpu(sibling) { + struct cpufreq_policy *cp = per_cpu(cpufreq_cpu_data, sibling); + if (cp && cpumask_test_cpu(cpu, cp->related_cpus)) + return cpufreq_add_policy_cpu(cpu, sibling, dev); + } +#endif #endif if (!try_module_get(cpufreq_driver->owner)) { @@ -942,7 +899,6 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) goto module_out; } - ret = -ENOMEM; policy = kzalloc(sizeof(struct cpufreq_policy), GFP_KERNEL); if (!policy) goto nomem_out; @@ -987,6 +943,9 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) goto err_unlock_policy; } + /* related cpus should atleast have policy->cpus */ + cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); + /* * affected cpus must always be the one, which are online. We aren't * managing offline cpus here. @@ -1000,14 +959,14 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) blocking_notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_START, policy); - ret = cpufreq_add_dev_policy(cpu, policy, dev); - if (ret) { - if (ret > 0) - /* This is a managed cpu, symlink created, - exit with 0 */ - ret = 0; - goto err_unlock_policy; +#ifdef CONFIG_HOTPLUG_CPU + gov = __find_governor(per_cpu(cpufreq_cpu_governor, cpu)); + if (gov) { + policy->governor = gov; + pr_debug("Restoring governor %s for cpu %d\n", + policy->governor->name, cpu); } +#endif ret = cpufreq_add_dev_interface(cpu, policy, dev); if (ret) @@ -1021,7 +980,6 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) return 0; - err_out_unregister: spin_lock_irqsave(&cpufreq_driver_lock, flags); for_each_cpu(j, policy->cpus) diff --git a/drivers/cpufreq/spear-cpufreq.c b/drivers/cpufreq/spear-cpufreq.c index 8ff26af..fc714a6 100644 --- a/drivers/cpufreq/spear-cpufreq.c +++ b/drivers/cpufreq/spear-cpufreq.c @@ -189,7 +189,6 @@ static int spear_cpufreq_init(struct cpufreq_policy *policy) policy->cur = spear_cpufreq_get(0); cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu)); - cpumask_copy(policy->related_cpus, policy->cpus); return 0; } -- 1.7.12.rc2.18.g61b472e

13 years

[PATCH 1/2] cpufreq: Set policy->related_cpus to atleast policy->cpus

by Viresh Kumar

With the addition of following patch, related_cpus is required to be set by cpufreq platform drivers: commit c1070fd743533efb54e98142252283583f379190 Author: Viresh Kumar <viresh.kumar(a)linaro.org> Date: Mon Jan 14 13:23:04 2013 +0000 cpufreq: Simplify cpufreq_add_dev() Because this change is required by all platform drivers, why not do this in the core itself. Hence, this patch is an attempt towards fixing all broken drivers. >From now on, platforms don't really need to set related_cpus from their init() routines, as the same work is done by core too. If platform driver needs to set the related_cpus mask with some additional cpus, other than cpus present in policy->cpus, they are free to do it as we aren't overriding anything. Signed-off-by: Viresh Kumar <viresh.kumar(a)linaro.org> --- Inderpal, Can you please add your tested-by for this patch? And this will require you to drop your patch for exynos-cpufreq.c :) drivers/cpufreq/cpufreq.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index f5dc02b..db81382 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -554,8 +554,6 @@ static ssize_t show_cpus(const struct cpumask *mask, char *buf) */ static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) { - if (cpumask_empty(policy->related_cpus)) - return show_cpus(policy->cpus, buf); return show_cpus(policy->related_cpus, buf); } @@ -945,6 +943,9 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) goto err_unlock_policy; } + /* related cpus should atleast have policy->cpus */ + cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); + /* * affected cpus must always be the one, which are online. We aren't * managing offline cpus here. -- 1.7.12.rc2.18.g61b472e

13 years

kernel NULL pointer dereference

by Renato Golin

Hi folks, I'm testing different kernels with the LLVM LAVA job and the latest one segfaulted. If you search for the phrase on the subject on the URL below: https://validation.linaro.org/lava-server/scheduler/job/46067/log_file You'll see the stack trace and memory dump. These are the tar balls I used: "rootfs": " http://releases.linaro.org/12.12/ubuntu/quantal-images/nano/linaro-quantal-… ", "hwpack": " http://releases.linaro.org/12.12/ubuntu/quantal-hwpacks/hwpack_linaro-panda… " Is this the right place to report this kind of stuff? cheers, --renato

13 years

Tools of updating kernel related files for android

by YongQin Liu

Hi, All Android team now has tools for updating the kernel related files without recreating the sdcard. The detail information about the tools is described here: https://wiki.linaro.org/Platform/Android/KernelUpdateTools And here just list some examples: 1. update all the kernel related files with boot.tar.bz2 ./update-android.sh out/target/product/pandaboard/boot.tar.bz2 2. only update one file that will be in the boot.tar.bz2 when packaged, Like board.dtb/uImage/cmdline ./update-android.sh out/target/product/pandaboard/boot/board.dtb ./update-android.sh out/target/product/pandaboard/boot/uImage ./update-android.sh out/target/product/pandaboard/boot/cmdline 3. update all kernel modules. ./update-android.sh out/target/product/pandaboard/obj/kernel 4. update files in uInitrd ./update-uInitrd.sh /tmp/init.rc this will replace the /ini.rc file in uInitrd with the passed /tmp/init.rc Hope these tools will be helpful during your development of android. Any comments/suggestion, please feel free to send to me. Thanks, Yongqin Liu --------------------------------------------------------------- #mailing list linaro-android(a)lists.linaro.org <linaro-dev(a)lists.linaro.org> http://lists.linaro.org/mailman/listinfo/linaro-android linaro-validation(a)lists.linaro.org <linaro-dev(a)lists.linaro.org> http://lists.linaro.org/pipermail/linaro-validation

13 years

[PM-QA PATCH 0/8] PM-QA commits recently

by Hongbo Zhang

Hi all, These are my PM-QA commits recently, send them out FYI. Hongbo Zhang (8): thermal: kill heater program if test is terminated by signal thermal: don't check launch of the glmark2 if it isn't there thermal: remove unnecessary variable TRIP_CROSSED_COUNT thermal: Consolidate launching glmark2 as GPU heater thermal: add switch for thermal_06.sh thermal: enable launching glmark2 in Android pm-qa: enable thermal test scipts. Version 0.4.0 Makefile | 4 ++-- VERSION | 2 +- include/thermal_functions.sh | 41 +++++++++++++++++++++++++++++++++++++++++ thermal/thermal_03.sh | 29 ++++++++++++----------------- thermal/thermal_04.sh | 11 ++++++++++- thermal/thermal_06.sh | 39 ++++++++++++++++++++------------------- 6 files changed, 86 insertions(+), 40 deletions(-) -- 1.8.0

13 years

[RFC] Virtio-desktop: Virtio-based virtual desktop

by Anup Patel

Hi All, How about having a generic Virtio-based machine for emulating a virtual desktop ? I know folks have already thought about this and probably also tried something or other on this front but, it will be good to know the downsides. Virtio-desktop can be a separate specification describing a virtual desktop. Of-course we cannot avoid few architecture dependent virtual devices in but the Virtio-desktop specification will try to keep minimum possible architecture dependent devices. As per our thoughts, a Virtio-desktop will have two kinds of devices: 1. Architecture dependent devices: This devices will be emulated in-kernel by architecture specific code of KVM or Xen or Some other hypervisor. a) Virtualized CPU b) Virtualized PIC (i.e. in-kernel architecture specific emulation of irqchip) c) Virtualized Timer (i.e. in-kernel architecture specific emulation of timer chip) 2. Architecture independent devices: This are Virtio-based devices which are usually required by a desktop virtual machine. a) Virtio-blk (storage) - Already available b) Virtio-net (network) - Already available c) Virtio-fb (display) - It seems some work has been already done for Virtio frame buffer but I did not find drivers/fb/virtio-fb.c in latest kernel (http://thread.gmane.org/gmane.comp.emulators.kvm.devel/42720) - Is Virtio-fb work still in-progress ?? d) Virtio-input (keyboard/mouse/multi-touch) - Currently not available - It will provide keyboard input events - It will provide mouse input events - It will provide multi-touch input events e) Virtio-power (reset/shutdown/enumeration) - It can provides info about the entire virtual machine including CPU, PIC, Timer, available Virtio devices, etc. - It can also provide CPU and Virtio-device hot-plugging - Its primary purpose would be to provide reset and shutdown of CPU and Virtio devices. - There will be only one instance of this device and its location will be fixed for each architecture. The Virtio-desktop specification may also describe a recommended memory map of for each architecture. Right now, only missing devices seems to be Virtio-fb, Virtio-input, and Virtio-power, which some of us are willing to take-up. IMHO, If we have something like Virtio-desktop specification then all possible guest OSes can have support for it and different hypervisor can emulate it without worrying about guest support. Best Regards, Anup

13 years

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

linaro-dev