diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/Kconfig | 3 | ||||
| -rw-r--r-- | drivers/base/Makefile | 1 | ||||
| -rw-r--r-- | drivers/base/base.h | 6 | ||||
| -rw-r--r-- | drivers/base/bus.c | 6 | ||||
| -rw-r--r-- | drivers/base/core.c | 7 | ||||
| -rw-r--r-- | drivers/base/cpu.c | 11 | ||||
| -rw-r--r-- | drivers/base/dd.c | 148 | ||||
| -rw-r--r-- | drivers/base/driver.c | 35 | ||||
| -rw-r--r-- | drivers/base/platform.c | 2 | ||||
| -rw-r--r-- | drivers/base/power/domain.c | 253 | ||||
| -rw-r--r-- | drivers/base/power/generic_ops.c | 157 | ||||
| -rw-r--r-- | drivers/base/power/main.c | 247 | ||||
| -rw-r--r-- | drivers/base/power/power.h | 4 | ||||
| -rw-r--r-- | drivers/base/power/qos.c | 61 | ||||
| -rw-r--r-- | drivers/base/power/sysfs.c | 47 | ||||
| -rw-r--r-- | drivers/base/power/wakeup.c | 85 | ||||
| -rw-r--r-- | drivers/base/soc.c | 183 |
17 files changed, 1068 insertions, 188 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index 7be9f79018e9..9aa618acfe97 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -176,6 +176,9 @@ config GENERIC_CPU_DEVICES bool default n +config SOC_BUS + bool + source "drivers/base/regmap/Kconfig" config DMA_SHARED_BUFFER diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 610f9997a403..b6d1b9c4200c 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_MODULES) += module.o endif obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o obj-$(CONFIG_REGMAP) += regmap/ +obj-$(CONFIG_SOC_BUS) += soc.o ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG diff --git a/drivers/base/base.h b/drivers/base/base.h index b858dfd9a37c..6ee17bb391a9 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -59,6 +59,10 @@ struct driver_private { * @knode_parent - node in sibling list * @knode_driver - node in driver list * @knode_bus - node in bus list + * @deferred_probe - entry in deferred_probe_list which is used to retry the + * binding of drivers which were unable to get all the resources needed by + * the device; typically because it depends on another driver getting + * probed first. * @driver_data - private pointer for driver specific info. Will turn into a * list soon. * @device - pointer back to the struct class that this structure is @@ -71,6 +75,7 @@ struct device_private { struct klist_node knode_parent; struct klist_node knode_driver; struct klist_node knode_bus; + struct list_head deferred_probe; void *driver_data; struct device *device; }; @@ -105,6 +110,7 @@ extern void bus_remove_driver(struct device_driver *drv); extern void driver_detach(struct device_driver *drv); extern int driver_probe_device(struct device_driver *drv, struct device *dev); +extern void driver_deferred_probe_del(struct device *dev); static inline int driver_match_device(struct device_driver *drv, struct device *dev) { diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 40fb12288ce2..26a06b801b5b 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -1194,13 +1194,15 @@ EXPORT_SYMBOL_GPL(subsys_interface_register); void subsys_interface_unregister(struct subsys_interface *sif) { - struct bus_type *subsys = sif->subsys; + struct bus_type *subsys; struct subsys_dev_iter iter; struct device *dev; - if (!sif) + if (!sif || !sif->subsys) return; + subsys = sif->subsys; + mutex_lock(&subsys->p->mutex); list_del_init(&sif->node); if (sif->remove_dev) { diff --git a/drivers/base/core.c b/drivers/base/core.c index 74dda4f697f9..e28ce9898af4 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -18,6 +18,8 @@ #include <linux/string.h> #include <linux/kdev_t.h> #include <linux/notifier.h> +#include <linux/of.h> +#include <linux/of_device.h> #include <linux/genhd.h> #include <linux/kallsyms.h> #include <linux/mutex.h> @@ -267,6 +269,9 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, if (dev->driver) add_uevent_var(env, "DRIVER=%s", dev->driver->name); + /* Add common DT information about the device */ + of_device_uevent(dev, env); + /* have the bus specific function add its stuff */ if (dev->bus && dev->bus->uevent) { retval = dev->bus->uevent(dev, env); @@ -921,6 +926,7 @@ int device_private_init(struct device *dev) dev->p->device = dev; klist_init(&dev->p->klist_children, klist_children_get, klist_children_put); + INIT_LIST_HEAD(&dev->p->deferred_probe); return 0; } @@ -1188,6 +1194,7 @@ void device_del(struct device *dev) device_remove_file(dev, &uevent_attr); device_remove_attrs(dev); bus_remove_device(dev); + driver_deferred_probe_del(dev); /* * Some platform devices are driven without driver attached diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index 4dabf5077c48..adf937bf4091 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -11,6 +11,7 @@ #include <linux/device.h> #include <linux/node.h> #include <linux/gfp.h> +#include <linux/slab.h> #include <linux/percpu.h> #include "base.h" @@ -244,6 +245,9 @@ int __cpuinit register_cpu(struct cpu *cpu, int num) cpu->dev.id = num; cpu->dev.bus = &cpu_subsys; cpu->dev.release = cpu_device_release; +#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE + cpu->dev.bus->uevent = arch_cpu_uevent; +#endif error = device_register(&cpu->dev); if (!error && cpu->hotpluggable) register_cpu_control(cpu); @@ -268,6 +272,10 @@ struct device *get_cpu_device(unsigned cpu) } EXPORT_SYMBOL_GPL(get_cpu_device); +#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE +static DEVICE_ATTR(modalias, 0444, arch_print_cpu_modalias, NULL); +#endif + static struct attribute *cpu_root_attrs[] = { #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE &dev_attr_probe.attr, @@ -278,6 +286,9 @@ static struct attribute *cpu_root_attrs[] = { &cpu_attrs[2].attr.attr, &dev_attr_kernel_max.attr, &dev_attr_offline.attr, +#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE + &dev_attr_modalias.attr, +#endif NULL }; diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 142e3d600f14..1b1cbb571d38 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -28,6 +28,141 @@ #include "base.h" #include "power/power.h" +/* + * Deferred Probe infrastructure. + * + * Sometimes driver probe order matters, but the kernel doesn't always have + * dependency information which means some drivers will get probed before a + * resource it depends on is available. For example, an SDHCI driver may + * first need a GPIO line from an i2c GPIO controller before it can be + * initialized. If a required resource is not available yet, a driver can + * request probing to be deferred by returning -EPROBE_DEFER from its probe hook + * + * Deferred probe maintains two lists of devices, a pending list and an active + * list. A driver returning -EPROBE_DEFER causes the device to be added to the + * pending list. A successful driver probe will trigger moving all devices + * from the pending to the active list so that the workqueue will eventually + * retry them. + * + * The deferred_probe_mutex must be held any time the deferred_probe_*_list + * of the (struct device*)->p->deferred_probe pointers are manipulated + */ +static DEFINE_MUTEX(deferred_probe_mutex); +static LIST_HEAD(deferred_probe_pending_list); +static LIST_HEAD(deferred_probe_active_list); +static struct workqueue_struct *deferred_wq; + +/** + * deferred_probe_work_func() - Retry probing devices in the active list. + */ +static void deferred_probe_work_func(struct work_struct *work) +{ + struct device *dev; + struct device_private *private; + /* + * This block processes every device in the deferred 'active' list. + * Each device is removed from the active list and passed to + * bus_probe_device() to re-attempt the probe. The loop continues + * until every device in the active list is removed and retried. + * + * Note: Once the device is removed from the list and the mutex is + * released, it is possible for the device get freed by another thread + * and cause a illegal pointer dereference. This code uses + * get/put_device() to ensure the device structure cannot disappear + * from under our feet. + */ + mutex_lock(&deferred_probe_mutex); + while (!list_empty(&deferred_probe_active_list)) { + private = list_first_entry(&deferred_probe_active_list, + typeof(*dev->p), deferred_probe); + dev = private->device; + list_del_init(&private->deferred_probe); + + get_device(dev); + + /* + * Drop the mutex while probing each device; the probe path may + * manipulate the deferred list + */ + mutex_unlock(&deferred_probe_mutex); + dev_dbg(dev, "Retrying from deferred list\n"); + bus_probe_device(dev); + mutex_lock(&deferred_probe_mutex); + + put_device(dev); + } + mutex_unlock(&deferred_probe_mutex); +} +static DECLARE_WORK(deferred_probe_work, deferred_probe_work_func); + +static void driver_deferred_probe_add(struct device *dev) +{ + mutex_lock(&deferred_probe_mutex); + if (list_empty(&dev->p->deferred_probe)) { + dev_dbg(dev, "Added to deferred list\n"); + list_add(&dev->p->deferred_probe, &deferred_probe_pending_list); + } + mutex_unlock(&deferred_probe_mutex); +} + +void driver_deferred_probe_del(struct device *dev) +{ + mutex_lock(&deferred_probe_mutex); + if (!list_empty(&dev->p->deferred_probe)) { + dev_dbg(dev, "Removed from deferred list\n"); + list_del_init(&dev->p->deferred_probe); + } + mutex_unlock(&deferred_probe_mutex); +} + +static bool driver_deferred_probe_enable = false; +/** + * driver_deferred_probe_trigger() - Kick off re-probing deferred devices + * + * This functions moves all devices from the pending list to the active + * list and schedules the deferred probe workqueue to process them. It + * should be called anytime a driver is successfully bound to a device. + */ +static void driver_deferred_probe_trigger(void) +{ + if (!driver_deferred_probe_enable) + return; + + /* + * A successful probe means that all the devices in the pending list + * should be triggered to be reprobed. Move all the deferred devices + * into the active list so they can be retried by the workqueue + */ + mutex_lock(&deferred_probe_mutex); + list_splice_tail_init(&deferred_probe_pending_list, + &deferred_probe_active_list); + mutex_unlock(&deferred_probe_mutex); + + /* + * Kick the re-probe thread. It may already be scheduled, but it is + * safe to kick it again. + */ + queue_work(deferred_wq, &deferred_probe_work); +} + +/** + * deferred_probe_initcall() - Enable probing of deferred devices + * + * We don't want to get in the way when the bulk of drivers are getting probed. + * Instead, this initcall makes sure that deferred probing is delayed until + * late_initcall time. + */ +static int deferred_probe_initcall(void) +{ + deferred_wq = create_singlethread_workqueue("deferwq"); + if (WARN_ON(!deferred_wq)) + return -ENOMEM; + + driver_deferred_probe_enable = true; + driver_deferred_probe_trigger(); + return 0; +} +late_initcall(deferred_probe_initcall); static void driver_bound(struct device *dev) { @@ -42,6 +177,13 @@ static void driver_bound(struct device *dev) klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices); + /* + * Make sure the device is no longer in one of the deferred lists and + * kick off retrying all pending devices + */ + driver_deferred_probe_del(dev); + driver_deferred_probe_trigger(); + if (dev->bus) blocking_notifier_call_chain(&dev->bus->p->bus_notifier, BUS_NOTIFY_BOUND_DRIVER, dev); @@ -142,7 +284,11 @@ probe_failed: driver_sysfs_remove(dev); dev->driver = NULL; - if (ret != -ENODEV && ret != -ENXIO) { + if (ret == -EPROBE_DEFER) { + /* Driver requested deferred probing */ + dev_info(dev, "Driver %s requests probe deferral\n", drv->name); + driver_deferred_probe_add(dev); + } else if (ret != -ENODEV && ret != -ENXIO) { /* driver matched but the probe failed */ printk(KERN_WARNING "%s: probe of %s failed with error %d\n", diff --git a/drivers/base/driver.c b/drivers/base/driver.c index b631f7c59453..60e4f77ca662 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -153,34 +153,6 @@ int driver_add_kobj(struct device_driver *drv, struct kobject *kobj, } EXPORT_SYMBOL_GPL(driver_add_kobj); -/** - * get_driver - increment driver reference count. - * @drv: driver. - */ -struct device_driver *get_driver(struct device_driver *drv) -{ - if (drv) { - struct driver_private *priv; - struct kobject *kobj; - - kobj = kobject_get(&drv->p->kobj); - priv = to_driver(kobj); - return priv->driver; - } - return NULL; -} -EXPORT_SYMBOL_GPL(get_driver); - -/** - * put_driver - decrement driver's refcount. - * @drv: driver. - */ -void put_driver(struct device_driver *drv) -{ - kobject_put(&drv->p->kobj); -} -EXPORT_SYMBOL_GPL(put_driver); - static int driver_add_groups(struct device_driver *drv, const struct attribute_group **groups) { @@ -234,7 +206,6 @@ int driver_register(struct device_driver *drv) other = driver_find(drv->name, drv->bus); if (other) { - put_driver(other); printk(KERN_ERR "Error: Driver '%s' is already registered, " "aborting...\n", drv->name); return -EBUSY; @@ -275,7 +246,9 @@ EXPORT_SYMBOL_GPL(driver_unregister); * Call kset_find_obj() to iterate over list of drivers on * a bus to find driver by name. Return driver if found. * - * Note that kset_find_obj increments driver's reference count. + * This routine provides no locking to prevent the driver it returns + * from being unregistered or unloaded while the caller is using it. + * The caller is responsible for preventing this. */ struct device_driver *driver_find(const char *name, struct bus_type *bus) { @@ -283,6 +256,8 @@ struct device_driver *driver_find(const char *name, struct bus_type *bus) struct driver_private *priv; if (k) { + /* Drop reference added by kset_find_obj() */ + kobject_put(k); priv = to_driver(k); return priv->driver; } diff --git a/drivers/base/platform.c b/drivers/base/platform.c index f0c605e99ade..a1a722502587 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -621,7 +621,7 @@ static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) int rc; /* Some devices have extra OF data and an OF-style MODALIAS */ - rc = of_device_uevent(dev,env); + rc = of_device_uevent_modalias(dev,env); if (rc != -ENODEV) return rc; diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 978bbf7ac6af..73ce9fbe9839 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -366,7 +366,7 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd) not_suspended = 0; list_for_each_entry(pdd, &genpd->dev_list, list_node) if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) - || pdd->dev->power.irq_safe)) + || pdd->dev->power.irq_safe || to_gpd_data(pdd)->always_on)) not_suspended++; if (not_suspended > genpd->in_progress) @@ -503,6 +503,9 @@ static int pm_genpd_runtime_suspend(struct device *dev) might_sleep_if(!genpd->dev_irq_safe); + if (dev_gpd_data(dev)->always_on) + return -EBUSY; + stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; if (stop_ok && !stop_ok(dev)) return -EBUSY; @@ -764,8 +767,10 @@ static int pm_genpd_prepare(struct device *dev) genpd_acquire_lock(genpd); - if (genpd->prepared_count++ == 0) + if (genpd->prepared_count++ == 0) { + genpd->suspended_count = 0; genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; + } genpd_release_lock(genpd); @@ -820,17 +825,16 @@ static int pm_genpd_suspend(struct device *dev) } /** - * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. + * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. * @dev: Device to suspend. * * Carry out a late suspend of a device under the assumption that its * pm_domain field points to the domain member of an object of type * struct generic_pm_domain representing a PM domain consisting of I/O devices. */ -static int pm_genpd_suspend_noirq(struct device *dev) +static int pm_genpd_suspend_late(struct device *dev) { struct generic_pm_domain *genpd; - int ret; dev_dbg(dev, "%s()\n", __func__); @@ -838,14 +842,28 @@ static int pm_genpd_suspend_noirq(struct device *dev) if (IS_ERR(genpd)) return -EINVAL; - if (genpd->suspend_power_off) - return 0; + return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev); +} - ret = genpd_suspend_late(genpd, dev); - if (ret) - return ret; +/** + * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. + * @dev: Device to suspend. + * + * Stop the device and remove power from the domain if all devices in it have + * been stopped. + */ +static int pm_genpd_suspend_noirq(struct device *dev) +{ + struct generic_pm_domain *genpd; - if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on + || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) return 0; genpd_stop_dev(genpd, dev); @@ -862,13 +880,10 @@ static int pm_genpd_suspend_noirq(struct device *dev) } /** - * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. + * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. * @dev: Device to resume. * - * Carry out an early resume of a device under the assumption that its - * pm_domain field points to the domain member of an object of type - * struct generic_pm_domain representing a power domain consisting of I/O - * devices. + * Restore power to the device's PM domain, if necessary, and start the device. */ static int pm_genpd_resume_noirq(struct device *dev) { @@ -880,7 +895,8 @@ static int pm_genpd_resume_noirq(struct device *dev) if (IS_ERR(genpd)) return -EINVAL; - if (genpd->suspend_power_off) + if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on + || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) return 0; /* @@ -890,13 +906,34 @@ static int pm_genpd_resume_noirq(struct device *dev) */ pm_genpd_poweron(genpd); genpd->suspended_count--; - genpd_start_dev(genpd, dev); - return genpd_resume_early(genpd, dev); + return genpd_start_dev(genpd, dev); } /** - * pm_genpd_resume - Resume a device belonging to an I/O power domain. + * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. + * @dev: Device to resume. + * + * Carry out an early resume of a device under the assumption that its + * pm_domain field points to the domain member of an object of type + * struct generic_pm_domain representing a power domain consisting of I/O + * devices. + */ +static int pm_genpd_resume_early(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev); +} + +/** + * pm_genpd_resume - Resume of device in an I/O PM domain. * @dev: Device to resume. * * Resume a device under the assumption that its pm_domain field points to the @@ -917,7 +954,7 @@ static int pm_genpd_resume(struct device *dev) } /** - * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. + * pm_genpd_freeze - Freezing a device in an I/O PM domain. * @dev: Device to freeze. * * Freeze a device under the assumption that its pm_domain field points to the @@ -938,7 +975,29 @@ static int pm_genpd_freeze(struct device *dev) } /** - * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. + * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. + * @dev: Device to freeze. + * + * Carry out a late freeze of a device under the assumption that its + * pm_domain field points to the domain member of an object of type + * struct generic_pm_domain representing a power domain consisting of I/O + * devices. + */ +static int pm_genpd_freeze_late(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev); +} + +/** + * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. * @dev: Device to freeze. * * Carry out a late freeze of a device under the assumption that its @@ -949,7 +1008,6 @@ static int pm_genpd_freeze(struct device *dev) static int pm_genpd_freeze_noirq(struct device *dev) { struct generic_pm_domain *genpd; - int ret; dev_dbg(dev, "%s()\n", __func__); @@ -957,20 +1015,33 @@ static int pm_genpd_freeze_noirq(struct device *dev) if (IS_ERR(genpd)) return -EINVAL; - if (genpd->suspend_power_off) - return 0; + return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ? + 0 : genpd_stop_dev(genpd, dev); +} - ret = genpd_freeze_late(genpd, dev); - if (ret) - return ret; +/** + * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. + * @dev: Device to thaw. + * + * Start the device, unless power has been removed from the domain already + * before the system transition. + */ +static int pm_genpd_thaw_noirq(struct device *dev) +{ + struct generic_pm_domain *genpd; - genpd_stop_dev(genpd, dev); + dev_dbg(dev, "%s()\n", __func__); - return 0; + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ? + 0 : genpd_start_dev(genpd, dev); } /** - * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. + * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. * @dev: Device to thaw. * * Carry out an early thaw of a device under the assumption that its @@ -978,7 +1049,7 @@ static int pm_genpd_freeze_noirq(struct device *dev) * struct generic_pm_domain representing a power domain consisting of I/O * devices. */ -static int pm_genpd_thaw_noirq(struct device *dev) +static int pm_genpd_thaw_early(struct device *dev) { struct generic_pm_domain *genpd; @@ -988,12 +1059,7 @@ static int pm_genpd_thaw_noirq(struct device *dev) if (IS_ERR(genpd)) return -EINVAL; - if (genpd->suspend_power_off) - return 0; - - genpd_start_dev(genpd, dev); - - return genpd_thaw_early(genpd, dev); + return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev); } /** @@ -1018,13 +1084,11 @@ static int pm_genpd_thaw(struct device *dev) } /** - * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. + * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. * @dev: Device to resume. * - * Carry out an early restore of a device under the assumption that its - * pm_domain field points to the domain member of an object of type - * struct generic_pm_domain representing a power domain consisting of I/O - * devices. + * Make sure the domain will be in the same power state as before the + * hibernation the system is resuming from and start the device if necessary. */ static int pm_genpd_restore_noirq(struct device *dev) { @@ -1040,23 +1104,35 @@ static int pm_genpd_restore_noirq(struct device *dev) * Since all of the "noirq" callbacks are executed sequentially, it is * guaranteed that this function will never run twice in parallel for * the same PM domain, so it is not necessary to use locking here. + * + * At this point suspended_count == 0 means we are being run for the + * first time for the given domain in the present cycle. */ - genpd->status = GPD_STATE_POWER_OFF; - if (genpd->suspend_power_off) { + if (genpd->suspended_count++ == 0) { /* - * The boot kernel might put the domain into the power on state, - * so make sure it really is powered off. + * The boot kernel might put the domain into arbitrary state, + * so make it appear as powered off to pm_genpd_poweron(), so + * that it tries to power it on in case it was really off. */ - if (genpd->power_off) - genpd->power_off(genpd); - return 0; + genpd->status = GPD_STATE_POWER_OFF; + if (genpd->suspend_power_off) { + /* + * If the domain was off before the hibernation, make + * sure it will be off going forward. + */ + if (genpd->power_off) + genpd->power_off(genpd); + + return 0; + } } + if (genpd->suspend_power_off) + return 0; + pm_genpd_poweron(genpd); - genpd->suspended_count--; - genpd_start_dev(genpd, dev); - return genpd_resume_early(genpd, dev); + return dev_gpd_data(dev)->always_on ? 0 : genpd_start_dev(genpd, dev); } /** @@ -1099,11 +1175,15 @@ static void pm_genpd_complete(struct device *dev) #define pm_genpd_prepare NULL #define pm_genpd_suspend NULL +#define pm_genpd_suspend_late NULL #define pm_genpd_suspend_noirq NULL +#define pm_genpd_resume_early NULL #define pm_genpd_resume_noirq NULL #define pm_genpd_resume NULL #define pm_genpd_freeze NULL +#define pm_genpd_freeze_late NULL #define pm_genpd_freeze_noirq NULL +#define pm_genpd_thaw_early NULL #define pm_genpd_thaw_noirq NULL #define pm_genpd_thaw NULL #define pm_genpd_restore_noirq NULL @@ -1171,6 +1251,38 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, } /** + * __pm_genpd_of_add_device - Add a device to an I/O PM domain. + * @genpd_node: Device tree node pointer representing a PM domain to which the + * the device is added to. + * @dev: Device to be added. + * @td: Set of PM QoS timing parameters to attach to the device. + */ +int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, + struct gpd_timing_data *td) +{ + struct generic_pm_domain *genpd = NULL, *gpd; + + dev_dbg(dev, "%s()\n", __func__); + + if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev)) + return -EINVAL; + + mutex_lock(&gpd_list_lock); + list_for_each_entry(gpd, &gpd_list, gpd_list_node) { + if (gpd->of_node == genpd_node) { + genpd = gpd; + break; + } + } + mutex_unlock(&gpd_list_lock); + + if (!genpd) + return -EINVAL; + + return __pm_genpd_add_device(genpd, dev, td); +} + +/** * pm_genpd_remove_device - Remove a device from an I/O PM domain. * @genpd: PM domain to remove the device from. * @dev: Device to be removed. @@ -1216,6 +1328,26 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd, } /** + * pm_genpd_dev_always_on - Set/unset the "always on" flag for a given device. + * @dev: Device to set/unset the flag for. + * @val: The new value of the device's "always on" flag. + */ +void pm_genpd_dev_always_on(struct device *dev, bool val) +{ + struct pm_subsys_data *psd; + unsigned long flags; + + spin_lock_irqsave(&dev->power.lock, flags); + + psd = dev_to_psd(dev); + if (psd && psd->domain_data) + to_gpd_data(psd->domain_data)->always_on = val; + + spin_unlock_irqrestore(&dev->power.lock, flags); +} +EXPORT_SYMBOL_GPL(pm_genpd_dev_always_on); + +/** * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. * @genpd: Master PM domain to add the subdomain to. * @subdomain: Subdomain to be added. @@ -1450,7 +1582,7 @@ static int pm_genpd_default_suspend_late(struct device *dev) { int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late; - return cb ? cb(dev) : pm_generic_suspend_noirq(dev); + return cb ? cb(dev) : pm_generic_suspend_late(dev); } /** @@ -1461,7 +1593,7 @@ static int pm_genpd_default_resume_early(struct device *dev) { int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early; - return cb ? cb(dev) : pm_generic_resume_noirq(dev); + return cb ? cb(dev) : pm_generic_resume_early(dev); } /** @@ -1494,7 +1626,7 @@ static int pm_genpd_default_freeze_late(struct device *dev) { int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; - return cb ? cb(dev) : pm_generic_freeze_noirq(dev); + return cb ? cb(dev) : pm_generic_freeze_late(dev); } /** @@ -1505,7 +1637,7 @@ static int pm_genpd_default_thaw_early(struct device *dev) { int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; - return cb ? cb(dev) : pm_generic_thaw_noirq(dev); + return cb ? cb(dev) : pm_generic_thaw_early(dev); } /** @@ -1557,23 +1689,28 @@ void pm_genpd_init(struct generic_pm_domain *genpd, genpd->poweroff_task = NULL; genpd->resume_count = 0; genpd->device_count = 0; - genpd->suspended_count = 0; genpd->max_off_time_ns = -1; genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; genpd->domain.ops.prepare = pm_genpd_prepare; genpd->domain.ops.suspend = pm_genpd_suspend; + genpd->domain.ops.suspend_late = pm_genpd_suspend_late; genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; + genpd->domain.ops.resume_early = pm_genpd_resume_early; genpd->domain.ops.resume = pm_genpd_resume; genpd->domain.ops.freeze = pm_genpd_freeze; + genpd->domain.ops.freeze_late = pm_genpd_freeze_late; genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; + genpd->domain.ops.thaw_early = pm_genpd_thaw_early; genpd->domain.ops.thaw = pm_genpd_thaw; genpd->domain.ops.poweroff = pm_genpd_suspend; + genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; + genpd->domain.ops.restore_early = pm_genpd_resume_early; genpd->domain.ops.restore = pm_genpd_resume; genpd->domain.ops.complete = pm_genpd_complete; genpd->dev_ops.save_state = pm_genpd_default_save_state; diff --git a/drivers/base/power/generic_ops.c b/drivers/base/power/generic_ops.c index 10bdd793f0bd..d03d290f31c2 100644 --- a/drivers/base/power/generic_ops.c +++ b/drivers/base/power/generic_ops.c @@ -92,59 +92,28 @@ int pm_generic_prepare(struct device *dev) } /** - * __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback. - * @dev: Device to handle. - * @event: PM transition of the system under way. - * @bool: Whether or not this is the "noirq" stage. - * - * Execute the PM callback corresponding to @event provided by the driver of - * @dev, if defined, and return its error code. Return 0 if the callback is - * not present. + * pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems. + * @dev: Device to suspend. */ -static int __pm_generic_call(struct device *dev, int event, bool noirq) +int pm_generic_suspend_noirq(struct device *dev) { const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; - int (*callback)(struct device *); - - if (!pm) - return 0; - - switch (event) { - case PM_EVENT_SUSPEND: - callback = noirq ? pm->suspend_noirq : pm->suspend; - break; - case PM_EVENT_FREEZE: - callback = noirq ? pm->freeze_noirq : pm->freeze; - break; - case PM_EVENT_HIBERNATE: - callback = noirq ? pm->poweroff_noirq : pm->poweroff; - break; - case PM_EVENT_RESUME: - callback = noirq ? pm->resume_noirq : pm->resume; - break; - case PM_EVENT_THAW: - callback = noirq ? pm->thaw_noirq : pm->thaw; - break; - case PM_EVENT_RESTORE: - callback = noirq ? pm->restore_noirq : pm->restore; - break; - default: - callback = NULL; - break; - } - return callback ? callback(dev) : 0; + return pm && pm->suspend_noirq ? pm->suspend_noirq(dev) : 0; } +EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq); /** - * pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems. + * pm_generic_suspend_late - Generic suspend_late callback for subsystems. * @dev: Device to suspend. */ -int pm_generic_suspend_noirq(struct device *dev) +int pm_generic_suspend_late(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_SUSPEND, true); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->suspend_late ? pm->suspend_late(dev) : 0; } -EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq); +EXPORT_SYMBOL_GPL(pm_generic_suspend_late); /** * pm_generic_suspend - Generic suspend callback for subsystems. @@ -152,7 +121,9 @@ EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq); */ int pm_generic_suspend(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_SUSPEND, false); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->suspend ? pm->suspend(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_suspend); @@ -162,17 +133,33 @@ EXPORT_SYMBOL_GPL(pm_generic_suspend); */ int pm_generic_freeze_noirq(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_FREEZE, true); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->freeze_noirq ? pm->freeze_noirq(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq); /** + * pm_generic_freeze_late - Generic freeze_late callback for subsystems. + * @dev: Device to freeze. + */ +int pm_generic_freeze_late(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->freeze_late ? pm->freeze_late(dev) : 0; +} +EXPORT_SYMBOL_GPL(pm_generic_freeze_late); + +/** * pm_generic_freeze - Generic freeze callback for subsystems. * @dev: Device to freeze. */ int pm_generic_freeze(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_FREEZE, false); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->freeze ? pm->freeze(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_freeze); @@ -182,17 +169,33 @@ EXPORT_SYMBOL_GPL(pm_generic_freeze); */ int pm_generic_poweroff_noirq(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_HIBERNATE, true); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->poweroff_noirq ? pm->poweroff_noirq(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq); /** + * pm_generic_poweroff_late - Generic poweroff_late callback for subsystems. + * @dev: Device to handle. + */ +int pm_generic_poweroff_late(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->poweroff_late ? pm->poweroff_late(dev) : 0; +} +EXPORT_SYMBOL_GPL(pm_generic_poweroff_late); + +/** * pm_generic_poweroff - Generic poweroff callback for subsystems. * @dev: Device to handle. */ int pm_generic_poweroff(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_HIBERNATE, false); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->poweroff ? pm->poweroff(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_poweroff); @@ -202,17 +205,33 @@ EXPORT_SYMBOL_GPL(pm_generic_poweroff); */ int pm_generic_thaw_noirq(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_THAW, true); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->thaw_noirq ? pm->thaw_noirq(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq); /** + * pm_generic_thaw_early - Generic thaw_early callback for subsystems. + * @dev: Device to thaw. + */ +int pm_generic_thaw_early(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->thaw_early ? pm->thaw_early(dev) : 0; +} +EXPORT_SYMBOL_GPL(pm_generic_thaw_early); + +/** * pm_generic_thaw - Generic thaw callback for subsystems. * @dev: Device to thaw. */ int pm_generic_thaw(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_THAW, false); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->thaw ? pm->thaw(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_thaw); @@ -222,17 +241,33 @@ EXPORT_SYMBOL_GPL(pm_generic_thaw); */ int pm_generic_resume_noirq(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_RESUME, true); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->resume_noirq ? pm->resume_noirq(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_resume_noirq); /** + * pm_generic_resume_early - Generic resume_early callback for subsystems. + * @dev: Device to resume. + */ +int pm_generic_resume_early(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->resume_early ? pm->resume_early(dev) : 0; +} +EXPORT_SYMBOL_GPL(pm_generic_resume_early); + +/** * pm_generic_resume - Generic resume callback for subsystems. * @dev: Device to resume. */ int pm_generic_resume(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_RESUME, false); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->resume ? pm->resume(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_resume); @@ -242,17 +277,33 @@ EXPORT_SYMBOL_GPL(pm_generic_resume); */ int pm_generic_restore_noirq(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_RESTORE, true); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->restore_noirq ? pm->restore_noirq(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_restore_noirq); /** + * pm_generic_restore_early - Generic restore_early callback for subsystems. + * @dev: Device to resume. + */ +int pm_generic_restore_early(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->restore_early ? pm->restore_early(dev) : 0; +} +EXPORT_SYMBOL_GPL(pm_generic_restore_early); + +/** * pm_generic_restore - Generic restore callback for subsystems. * @dev: Device to restore. */ int pm_generic_restore(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_RESTORE, false); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + return pm && pm->restore ? pm->restore(dev) : 0; } EXPORT_SYMBOL_GPL(pm_generic_restore); diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index e2cc3d2e0ecc..b462c0e341cb 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -47,6 +47,7 @@ typedef int (*pm_callback_t)(struct device *); LIST_HEAD(dpm_list); LIST_HEAD(dpm_prepared_list); LIST_HEAD(dpm_suspended_list); +LIST_HEAD(dpm_late_early_list); LIST_HEAD(dpm_noirq_list); struct suspend_stats suspend_stats; @@ -246,6 +247,40 @@ static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) } /** + * pm_late_early_op - Return the PM operation appropriate for given PM event. + * @ops: PM operations to choose from. + * @state: PM transition of the system being carried out. + * + * Runtime PM is disabled for @dev while this function is being executed. + */ +static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, + pm_message_t state) +{ + switch (state.event) { +#ifdef CONFIG_SUSPEND + case PM_EVENT_SUSPEND: + return ops->suspend_late; + case PM_EVENT_RESUME: + return ops->resume_early; +#endif /* CONFIG_SUSPEND */ +#ifdef CONFIG_HIBERNATE_CALLBACKS + case PM_EVENT_FREEZE: + case PM_EVENT_QUIESCE: + return ops->freeze_late; + case PM_EVENT_HIBERNATE: + return ops->poweroff_late; + case PM_EVENT_THAW: + case PM_EVENT_RECOVER: + return ops->thaw_early; + case PM_EVENT_RESTORE: + return ops->restore_early; +#endif /* CONFIG_HIBERNATE_CALLBACKS */ + } + + return NULL; +} + +/** * pm_noirq_op - Return the PM operation appropriate for given PM event. * @ops: PM operations to choose from. * @state: PM transition of the system being carried out. @@ -374,21 +409,21 @@ static int device_resume_noirq(struct device *dev, pm_message_t state) TRACE_RESUME(0); if (dev->pm_domain) { - info = "EARLY power domain "; + info = "noirq power domain "; callback = pm_noirq_op(&dev->pm_domain->ops, state); } else if (dev->type && dev->type->pm) { - info = "EARLY type "; + info = "noirq type "; callback = pm_noirq_op(dev->type->pm, state); } else if (dev->class && dev->class->pm) { - info = "EARLY class "; + info = "noirq class "; callback = pm_noirq_op(dev->class->pm, state); } else if (dev->bus && dev->bus->pm) { - info = "EARLY bus "; + info = "noirq bus "; callback = pm_noirq_op(dev->bus->pm, state); } if (!callback && dev->driver && dev->driver->pm) { - info = "EARLY driver "; + info = "noirq driver "; callback = pm_noirq_op(dev->driver->pm, state); } @@ -399,13 +434,13 @@ static int device_resume_noirq(struct device *dev, pm_message_t state) } /** - * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. + * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. * @state: PM transition of the system being carried out. * - * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and + * Call the "noirq" resume handlers for all devices in dpm_noirq_list and * enable device drivers to receive interrupts. */ -void dpm_resume_noirq(pm_message_t state) +static void dpm_resume_noirq(pm_message_t state) { ktime_t starttime = ktime_get(); @@ -415,7 +450,7 @@ void dpm_resume_noirq(pm_message_t state) int error; get_device(dev); - list_move_tail(&dev->power.entry, &dpm_suspended_list); + list_move_tail(&dev->power.entry, &dpm_late_early_list); mutex_unlock(&dpm_list_mtx); error = device_resume_noirq(dev, state); @@ -423,6 +458,80 @@ void dpm_resume_noirq(pm_message_t state) suspend_stats.failed_resume_noirq++; dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); dpm_save_failed_dev(dev_name(dev)); + pm_dev_err(dev, state, " noirq", error); + } + + mutex_lock(&dpm_list_mtx); + put_device(dev); + } + mutex_unlock(&dpm_list_mtx); + dpm_show_time(starttime, state, "noirq"); + resume_device_irqs(); +} + +/** + * device_resume_early - Execute an "early resume" callback for given device. + * @dev: Device to handle. + * @state: PM transition of the system being carried out. + * + * Runtime PM is disabled for @dev while this function is being executed. + */ +static int device_resume_early(struct device *dev, pm_message_t state) +{ + pm_callback_t callback = NULL; + char *info = NULL; + int error = 0; + + TRACE_DEVICE(dev); + TRACE_RESUME(0); + + if (dev->pm_domain) { + info = "early power domain "; + callback = pm_late_early_op(&dev->pm_domain->ops, state); + } else if (dev->type && dev->type->pm) { + info = "early type "; + callback = pm_late_early_op(dev->type->pm, state); + } else if (dev->class && dev->class->pm) { + info = "early class "; + callback = pm_late_early_op(dev->class->pm, state); + } else if (dev->bus && dev->bus->pm) { + info = "early bus "; + callback = pm_late_early_op(dev->bus->pm, state); + } + + if (!callback && dev->driver && dev->driver->pm) { + info = "early driver "; + callback = pm_late_early_op(dev->driver->pm, state); + } + + error = dpm_run_callback(callback, dev, state, info); + + TRACE_RESUME(error); + return error; +} + +/** + * dpm_resume_early - Execute "early resume" callbacks for all devices. + * @state: PM transition of the system being carried out. + */ +static void dpm_resume_early(pm_message_t state) +{ + ktime_t starttime = ktime_get(); + + mutex_lock(&dpm_list_mtx); + while (!list_empty(&dpm_late_early_list)) { + struct device *dev = to_device(dpm_late_early_list.next); + int error; + + get_device(dev); + list_move_tail(&dev->power.entry, &dpm_suspended_list); + mutex_unlock(&dpm_list_mtx); + + error = device_resume_early(dev, state); + if (error) { + suspend_stats.failed_resume_early++; + dpm_save_failed_step(SUSPEND_RESUME_EARLY); + dpm_save_failed_dev(dev_name(dev)); pm_dev_err(dev, state, " early", error); } @@ -431,9 +540,18 @@ void dpm_resume_noirq(pm_message_t state) } mutex_unlock(&dpm_list_mtx); dpm_show_time(starttime, state, "early"); - resume_device_irqs(); } -EXPORT_SYMBOL_GPL(dpm_resume_noirq); + +/** + * dpm_resume_start - Execute "noirq" and "early" device callbacks. + * @state: PM transition of the system being carried out. + */ +void dpm_resume_start(pm_message_t state) +{ + dpm_resume_noirq(state); + dpm_resume_early(state); +} +EXPORT_SYMBOL_GPL(dpm_resume_start); /** * device_resume - Execute "resume" callbacks for given device. @@ -716,21 +834,21 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state) char *info = NULL; if (dev->pm_domain) { - info = "LATE power domain "; + info = "noirq power domain "; callback = pm_noirq_op(&dev->pm_domain->ops, state); } else if (dev->type && dev->type->pm) { - info = "LATE type "; + info = "noirq type "; callback = pm_noirq_op(dev->type->pm, state); } else if (dev->class && dev->class->pm) { - info = "LATE class "; + info = "noirq class "; callback = pm_noirq_op(dev->class->pm, state); } else if (dev->bus && dev->bus->pm) { - info = "LATE bus "; + info = "noirq bus "; callback = pm_noirq_op(dev->bus->pm, state); } if (!callback && dev->driver && dev->driver->pm) { - info = "LATE driver "; + info = "noirq driver "; callback = pm_noirq_op(dev->driver->pm, state); } @@ -738,21 +856,21 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state) } /** - * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. + * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. * @state: PM transition of the system being carried out. * * Prevent device drivers from receiving interrupts and call the "noirq" suspend * handlers for all non-sysdev devices. */ -int dpm_suspend_noirq(pm_message_t state) +static int dpm_suspend_noirq(pm_message_t state) { ktime_t starttime = ktime_get(); int error = 0; suspend_device_irqs(); mutex_lock(&dpm_list_mtx); - while (!list_empty(&dpm_suspended_list)) { - struct device *dev = to_device(dpm_suspended_list.prev); + while (!list_empty(&dpm_late_early_list)) { + struct device *dev = to_device(dpm_late_early_list.prev); get_device(dev); mutex_unlock(&dpm_list_mtx); @@ -761,7 +879,7 @@ int dpm_suspend_noirq(pm_message_t state) mutex_lock(&dpm_list_mtx); if (error) { - pm_dev_err(dev, state, " late", error); + pm_dev_err(dev, state, " noirq", error); suspend_stats.failed_suspend_noirq++; dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); dpm_save_failed_dev(dev_name(dev)); @@ -776,10 +894,95 @@ int dpm_suspend_noirq(pm_message_t state) if (error) dpm_resume_noirq(resume_event(state)); else + dpm_show_time(starttime, state, "noirq"); + return error; +} + +/** + * device_suspend_late - Execute a "late suspend" callback for given device. + * @dev: Device to handle. + * @state: PM transition of the system being carried out. + * + * Runtime PM is disabled for @dev while this function is being executed. + */ +static int device_suspend_late(struct device *dev, pm_message_t state) +{ + pm_callback_t callback = NULL; + char *info = NULL; + + if (dev->pm_domain) { + info = "late power domain "; + callback = pm_late_early_op(&dev->pm_domain->ops, state); + } else if (dev->type && dev->type->pm) { + info = "late type "; + callback = pm_late_early_op(dev->type->pm, state); + } else if (dev->class && dev->class->pm) { + info = "late class "; + callback = pm_late_early_op(dev->class->pm, state); + } else if (dev->bus && dev->bus->pm) { + info = "late bus "; + callback = pm_late_early_op(dev->bus->pm, state); + } + + if (!callback && dev->driver && dev->driver->pm) { + info = "late driver "; + callback = pm_late_early_op(dev->driver->pm, state); + } + + return dpm_run_callback(callback, dev, state, info); +} + +/** + * dpm_suspend_late - Execute "late suspend" callbacks for all devices. + * @state: PM transition of the system being carried out. + */ +static int dpm_suspend_late(pm_message_t state) +{ + ktime_t starttime = ktime_get(); + int error = 0; + + mutex_lock(&dpm_list_mtx); + while (!list_empty(&dpm_suspended_list)) { + struct device *dev = to_device(dpm_suspended_list.prev); + + get_device(dev); + mutex_unlock(&dpm_list_mtx); + + error = device_suspend_late(dev, state); + + mutex_lock(&dpm_list_mtx); + if (error) { + pm_dev_err(dev, state, " late", error); + suspend_stats.failed_suspend_late++; + dpm_save_failed_step(SUSPEND_SUSPEND_LATE); + dpm_save_failed_dev(dev_name(dev)); + put_device(dev); + break; + } + if (!list_empty(&dev->power.entry)) + list_move(&dev->power.entry, &dpm_late_early_list); + put_device(dev); + } + mutex_unlock(&dpm_list_mtx); + if (error) + dpm_resume_early(resume_event(state)); + else dpm_show_time(starttime, state, "late"); + return error; } -EXPORT_SYMBOL_GPL(dpm_suspend_noirq); + +/** + * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. + * @state: PM transition of the system being carried out. + */ +int dpm_suspend_end(pm_message_t state) +{ + int error = dpm_suspend_late(state); + + return error ? : dpm_suspend_noirq(state); +} +EXPORT_SYMBOL_GPL(dpm_suspend_end); /** * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h index 9bf62323aaf3..eeb4bff9505c 100644 --- a/drivers/base/power/power.h +++ b/drivers/base/power/power.h @@ -71,6 +71,8 @@ extern void dpm_sysfs_remove(struct device *dev); extern void rpm_sysfs_remove(struct device *dev); extern int wakeup_sysfs_add(struct device *dev); extern void wakeup_sysfs_remove(struct device *dev); +extern int pm_qos_sysfs_add(struct device *dev); +extern void pm_qos_sysfs_remove(struct device *dev); #else /* CONFIG_PM */ @@ -79,5 +81,7 @@ static inline void dpm_sysfs_remove(struct device *dev) {} static inline void rpm_sysfs_remove(struct device *dev) {} static inline int wakeup_sysfs_add(struct device *dev) { return 0; } static inline void wakeup_sysfs_remove(struct device *dev) {} +static inline int pm_qos_sysfs_add(struct device *dev) { return 0; } +static inline void pm_qos_sysfs_remove(struct device *dev) {} #endif diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index c5d358837461..71855570922d 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -41,6 +41,7 @@ #include <linux/mutex.h> #include <linux/export.h> +#include "power.h" static DEFINE_MUTEX(dev_pm_qos_mtx); @@ -166,6 +167,12 @@ void dev_pm_qos_constraints_destroy(struct device *dev) struct dev_pm_qos_request *req, *tmp; struct pm_qos_constraints *c; + /* + * If the device's PM QoS resume latency limit has been exposed to user + * space, it has to be hidden at this point. + */ + dev_pm_qos_hide_latency_limit(dev); + mutex_lock(&dev_pm_qos_mtx); dev->power.power_state = PMSG_INVALID; @@ -445,3 +452,57 @@ int dev_pm_qos_add_ancestor_request(struct device *dev, return error; } EXPORT_SYMBOL_GPL(dev_pm_qos_add_ancestor_request); + +#ifdef CONFIG_PM_RUNTIME +static void __dev_pm_qos_drop_user_request(struct device *dev) +{ + dev_pm_qos_remove_request(dev->power.pq_req); + dev->power.pq_req = 0; +} + +/** + * dev_pm_qos_expose_latency_limit - Expose PM QoS latency limit to user space. + * @dev: Device whose PM QoS latency limit is to be exposed to user space. + * @value: Initial value of the latency limit. + */ +int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) +{ + struct dev_pm_qos_request *req; + int ret; + + if (!device_is_registered(dev) || value < 0) + return -EINVAL; + + if (dev->power.pq_req) + return -EEXIST; + + req = kzalloc(sizeof(*req), GFP_KERNEL); + if (!req) + return -ENOMEM; + + ret = dev_pm_qos_add_request(dev, req, value); + if (ret < 0) + return ret; + + dev->power.pq_req = req; + ret = pm_qos_sysfs_add(dev); + if (ret) + __dev_pm_qos_drop_user_request(dev); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit); + +/** + * dev_pm_qos_hide_latency_limit - Hide PM QoS latency limit from user space. + * @dev: Device whose PM QoS latency limit is to be hidden from user space. + */ +void dev_pm_qos_hide_latency_limit(struct device *dev) +{ + if (dev->power.pq_req) { + pm_qos_sysfs_remove(dev); + __dev_pm_qos_drop_user_request(dev); + } +} +EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_limit); +#endif /* CONFIG_PM_RUNTIME */ diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c index adf41be0ea66..95c12f6cb5b9 100644 --- a/drivers/base/power/sysfs.c +++ b/drivers/base/power/sysfs.c @@ -5,6 +5,7 @@ #include <linux/device.h> #include <linux/string.h> #include <linux/export.h> +#include <linux/pm_qos.h> #include <linux/pm_runtime.h> #include <linux/atomic.h> #include <linux/jiffies.h> @@ -217,6 +218,31 @@ static ssize_t autosuspend_delay_ms_store(struct device *dev, static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show, autosuspend_delay_ms_store); +static ssize_t pm_qos_latency_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", dev->power.pq_req->node.prio); +} + +static ssize_t pm_qos_latency_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t n) +{ + s32 value; + int ret; + + if (kstrtos32(buf, 0, &value)) + return -EINVAL; + + if (value < 0) + return -EINVAL; + + ret = dev_pm_qos_update_request(dev->power.pq_req, value); + return ret < 0 ? ret : n; +} + +static DEVICE_ATTR(pm_qos_resume_latency_us, 0644, + pm_qos_latency_show, pm_qos_latency_store); #endif /* CONFIG_PM_RUNTIME */ #ifdef CONFIG_PM_SLEEP @@ -490,6 +516,17 @@ static struct attribute_group pm_runtime_attr_group = { .attrs = runtime_attrs, }; +static struct attribute *pm_qos_attrs[] = { +#ifdef CONFIG_PM_RUNTIME + &dev_attr_pm_qos_resume_latency_us.attr, +#endif /* CONFIG_PM_RUNTIME */ + NULL, +}; +static struct attribute_group pm_qos_attr_group = { + .name = power_group_name, + .attrs = pm_qos_attrs, +}; + int dpm_sysfs_add(struct device *dev) { int rc; @@ -530,6 +567,16 @@ void wakeup_sysfs_remove(struct device *dev) sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group); } +int pm_qos_sysfs_add(struct device *dev) +{ + return sysfs_merge_group(&dev->kobj, &pm_qos_attr_group); +} + +void pm_qos_sysfs_remove(struct device *dev) +{ + sysfs_unmerge_group(&dev->kobj, &pm_qos_attr_group); +} + void rpm_sysfs_remove(struct device *dev) { sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group); diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index caf995fb774b..2a3e581b8dcd 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -53,6 +53,23 @@ static void pm_wakeup_timer_fn(unsigned long data); static LIST_HEAD(wakeup_sources); /** + * wakeup_source_prepare - Prepare a new wakeup source for initialization. + * @ws: Wakeup source to prepare. + * @name: Pointer to the name of the new wakeup source. + * + * Callers must ensure that the @name string won't be freed when @ws is still in + * use. + */ +void wakeup_source_prepare(struct wakeup_source *ws, const char *name) +{ + if (ws) { + memset(ws, 0, sizeof(*ws)); + ws->name = name; + } +} +EXPORT_SYMBOL_GPL(wakeup_source_prepare); + +/** * wakeup_source_create - Create a struct wakeup_source object. * @name: Name of the new wakeup source. */ @@ -60,37 +77,44 @@ struct wakeup_source *wakeup_source_create(const char *name) { struct wakeup_source *ws; - ws = kzalloc(sizeof(*ws), GFP_KERNEL); + ws = kmalloc(sizeof(*ws), GFP_KERNEL); if (!ws) return NULL; - spin_lock_init(&ws->lock); - if (name) - ws->name = kstrdup(name, GFP_KERNEL); - + wakeup_source_prepare(ws, name ? kstrdup(name, GFP_KERNEL) : NULL); return ws; } EXPORT_SYMBOL_GPL(wakeup_source_create); /** + * wakeup_source_drop - Prepare a struct wakeup_source object for destruction. + * @ws: Wakeup source to prepare for destruction. + * + * Callers must ensure that __pm_stay_awake() or __pm_wakeup_event() will never + * be run in parallel with this function for the same wakeup source object. + */ +void wakeup_source_drop(struct wakeup_source *ws) +{ + if (!ws) + return; + + del_timer_sync(&ws->timer); + __pm_relax(ws); +} +EXPORT_SYMBOL_GPL(wakeup_source_drop); + +/** * wakeup_source_destroy - Destroy a struct wakeup_source object. * @ws: Wakeup source to destroy. + * + * Use only for wakeup source objects created with wakeup_source_create(). */ void wakeup_source_destroy(struct wakeup_source *ws) { if (!ws) return; - spin_lock_irq(&ws->lock); - while (ws->active) { - spin_unlock_irq(&ws->lock); - - schedule_timeout_interruptible(msecs_to_jiffies(TIMEOUT)); - - spin_lock_irq(&ws->lock); - } - spin_unlock_irq(&ws->lock); - + wakeup_source_drop(ws); kfree(ws->name); kfree(ws); } @@ -105,6 +129,7 @@ void wakeup_source_add(struct wakeup_source *ws) if (WARN_ON(!ws)) return; + spin_lock_init(&ws->lock); setup_timer(&ws->timer, pm_wakeup_timer_fn, (unsigned long)ws); ws->active = false; @@ -152,8 +177,10 @@ EXPORT_SYMBOL_GPL(wakeup_source_register); */ void wakeup_source_unregister(struct wakeup_source *ws) { - wakeup_source_remove(ws); - wakeup_source_destroy(ws); + if (ws) { + wakeup_source_remove(ws); + wakeup_source_destroy(ws); + } } EXPORT_SYMBOL_GPL(wakeup_source_unregister); @@ -349,7 +376,6 @@ static void wakeup_source_activate(struct wakeup_source *ws) { ws->active = true; ws->active_count++; - ws->timer_expires = jiffies; ws->last_time = ktime_get(); /* Increment the counter of events in progress. */ @@ -370,9 +396,14 @@ void __pm_stay_awake(struct wakeup_source *ws) return; spin_lock_irqsave(&ws->lock, flags); + ws->event_count++; if (!ws->active) wakeup_source_activate(ws); + + del_timer(&ws->timer); + ws->timer_expires = 0; + spin_unlock_irqrestore(&ws->lock, flags); } EXPORT_SYMBOL_GPL(__pm_stay_awake); @@ -438,6 +469,7 @@ static void wakeup_source_deactivate(struct wakeup_source *ws) ws->max_time = duration; del_timer(&ws->timer); + ws->timer_expires = 0; /* * Increment the counter of registered wakeup events and decrement the @@ -492,11 +524,22 @@ EXPORT_SYMBOL_GPL(pm_relax); * pm_wakeup_timer_fn - Delayed finalization of a wakeup event. * @data: Address of the wakeup source object associated with the event source. * - * Call __pm_relax() for the wakeup source whose address is stored in @data. + * Call wakeup_source_deactivate() for the wakeup source whose address is stored + * in @data if it is currently active and its timer has not been canceled and + * the expiration time of the timer is not in future. */ static void pm_wakeup_timer_fn(unsigned long data) { - __pm_relax((struct wakeup_source *)data); + struct wakeup_source *ws = (struct wakeup_source *)data; + unsigned long flags; + + spin_lock_irqsave(&ws->lock, flags); + + if (ws->active && ws->timer_expires + && time_after_eq(jiffies, ws->timer_expires)) + wakeup_source_deactivate(ws); + + spin_unlock_irqrestore(&ws->lock, flags); } /** @@ -534,7 +577,7 @@ void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec) if (!expires) expires = 1; - if (time_after(expires, ws->timer_expires)) { + if (!ws->timer_expires || time_after(expires, ws->timer_expires)) { mod_timer(&ws->timer, expires); ws->timer_expires = expires; } diff --git a/drivers/base/soc.c b/drivers/base/soc.c new file mode 100644 index 000000000000..05f150382da8 --- /dev/null +++ b/drivers/base/soc.c @@ -0,0 +1,183 @@ +/* + * Copyright (C) ST-Ericsson SA 2011 + * + * Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson. + * License terms: GNU General Public License (GPL), version 2 + */ + +#include <linux/sysfs.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/stat.h> +#include <linux/slab.h> +#include <linux/idr.h> +#include <linux/spinlock.h> +#include <linux/sys_soc.h> +#include <linux/err.h> + +static DEFINE_IDR(soc_ida); +static DEFINE_SPINLOCK(soc_lock); + +static ssize_t soc_info_get(struct device *dev, + struct device_attribute *attr, + char *buf); + +struct soc_device { + struct device dev; + struct soc_device_attribute *attr; + int soc_dev_num; +}; + +static struct bus_type soc_bus_type = { + .name = "soc", +}; + +static DEVICE_ATTR(machine, S_IRUGO, soc_info_get, NULL); +static DEVICE_ATTR(family, S_IRUGO, soc_info_get, NULL); +static DEVICE_ATTR(soc_id, S_IRUGO, soc_info_get, NULL); +static DEVICE_ATTR(revision, S_IRUGO, soc_info_get, NULL); + +struct device *soc_device_to_device(struct soc_device *soc_dev) +{ + return &soc_dev->dev; +} + +static mode_t soc_attribute_mode(struct kobject *kobj, + struct attribute *attr, + int index) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); + + if ((attr == &dev_attr_machine.attr) + && (soc_dev->attr->machine != NULL)) + return attr->mode; + if ((attr == &dev_attr_family.attr) + && (soc_dev->attr->family != NULL)) + return attr->mode; + if ((attr == &dev_attr_revision.attr) + && (soc_dev->attr->revision != NULL)) + return attr->mode; + if ((attr == &dev_attr_soc_id.attr) + && (soc_dev->attr->soc_id != NULL)) + return attr->mode; + + /* Unknown or unfilled attribute. */ + return 0; +} + +static ssize_t soc_info_get(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); + + if (attr == &dev_attr_machine) + return sprintf(buf, "%s\n", soc_dev->attr->machine); + if (attr == &dev_attr_family) + return sprintf(buf, "%s\n", soc_dev->attr->family); + if (attr == &dev_attr_revision) + return sprintf(buf, "%s\n", soc_dev->attr->revision); + if (attr == &dev_attr_soc_id) + return sprintf(buf, "%s\n", soc_dev->attr->soc_id); + + return -EINVAL; + +} + +static struct attribute *soc_attr[] = { + &dev_attr_machine.attr, + &dev_attr_family.attr, + &dev_attr_soc_id.attr, + &dev_attr_revision.attr, + NULL, +}; + +static const struct attribute_group soc_attr_group = { + .attrs = soc_attr, + .is_visible = soc_attribute_mode, +}; + +static const struct attribute_group *soc_attr_groups[] = { + &soc_attr_group, + NULL, +}; + +static void soc_release(struct device *dev) +{ + struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); + + kfree(soc_dev); +} + +struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr) +{ + struct soc_device *soc_dev; + int ret; + + soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL); + if (!soc_dev) { + ret = -ENOMEM; + goto out1; + } + + /* Fetch a unique (reclaimable) SOC ID. */ + do { + if (!ida_pre_get(&soc_ida, GFP_KERNEL)) { + ret = -ENOMEM; + goto out2; + } + + spin_lock(&soc_lock); + ret = ida_get_new(&soc_ida, &soc_dev->soc_dev_num); + spin_unlock(&soc_lock); + + } while (ret == -EAGAIN); + + if (ret) + goto out2; + + soc_dev->attr = soc_dev_attr; + soc_dev->dev.bus = &soc_bus_type; + soc_dev->dev.groups = soc_attr_groups; + soc_dev->dev.release = soc_release; + + dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num); + + ret = device_register(&soc_dev->dev); + if (ret) + goto out3; + + return soc_dev; + +out3: + ida_remove(&soc_ida, soc_dev->soc_dev_num); +out2: + kfree(soc_dev); +out1: + return ERR_PTR(ret); +} + +/* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */ +void soc_device_unregister(struct soc_device *soc_dev) +{ + ida_remove(&soc_ida, soc_dev->soc_dev_num); + + device_unregister(&soc_dev->dev); +} + +static int __init soc_bus_register(void) +{ + spin_lock_init(&soc_lock); + + return bus_register(&soc_bus_type); +} +core_initcall(soc_bus_register); + +static void __exit soc_bus_unregister(void) +{ + ida_destroy(&soc_ida); + + bus_unregister(&soc_bus_type); +} +module_exit(soc_bus_unregister); |