On 22 November 2013 14:41, viresh kumar <viresh.kumar@xxxxxxxxxx> wrote:
> So, what about something like this ?
>
> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index f48370d..523c0bc 100644
> --- a/drivers/base/cpu.c
> +++ b/drivers/base/cpu.c
> @@ -120,6 +120,45 @@ static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
> #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
> #endif /* CONFIG_HOTPLUG_CPU */
>
> +int cpu_subsys_suspend_noirq(struct device *dev)
> +{
> + struct bus_type *bus = dev->bus;
> + struct subsys_interface *sif;
> + int ret = 0;
> +
> + list_for_each_entry(sif, &bus->p->interfaces, node) {
> + if (sif->pm && sif->pm->suspend_noirq) {
> + ret = sif->suspend_noirq(dev);
> + if (ret)
> + break;
> + }
> + }
> +
> + return ret;
> +}
> +
> +int cpu_subsys_resume_noirq(struct device *dev)
> +{
> + struct bus_type *bus = dev->bus;
> + struct subsys_interface *sif;
> + int ret = 0;
> +
> + list_for_each_entry(sif, &bus->p->interfaces, node) {
> + if (sif->pm && sif->pm->resume_noirq) {
> + ret = sif->resume_noirq(dev);
> + if (ret)
> + break;
> + }
> + }
> +
> + return ret;
> +}
> +
> +static const struct dev_pm_ops cpu_subsys_pm_ops = {
> + .suspend_noirq = cpu_subsys_suspend_noirq,
> + .resume_noirq = cpu_subsys_resume_noirq,
> +};
> +
> struct bus_type cpu_subsys = {
> .name = "cpu",
> .dev_name = "cpu",
> @@ -128,6 +167,7 @@ struct bus_type cpu_subsys = {
> .online = cpu_subsys_online,
> .offline = cpu_subsys_offline,
> #endif
> + .pm = &cpu_subsys_pm_ops,
> };
> EXPORT_SYMBOL_GPL(cpu_subsys);
>
> diff --git a/include/linux/device.h b/include/linux/device.h
> index b025925..fa01273 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -298,11 +298,16 @@ struct device *driver_find_device(struct device_driver *drv,
> * @node: the list of functions registered at the subsystem
> * @add_dev: device hookup to device function handler
> * @remove_dev: device hookup to device function handler
> + * @pm: Power management operations of this interface.
> *
> * Simple interfaces attached to a subsystem. Multiple interfaces can
> * attach to a subsystem and its devices. Unlike drivers, they do not
> * exclusively claim or control devices. Interfaces usually represent
> * a specific functionality of a subsystem/class of devices.
> + *
> + * PM callbacks are called from individual subsystems instead of PM core. And
> + * hence might not be available for all subsystems. Currently present for:
> + * cpu_subsys.
> */
> struct subsys_interface {
> const char *name;
> @@ -310,6 +315,7 @@ struct subsys_interface {
> struct list_head node;
> int (*add_dev)(struct device *dev, struct subsys_interface *sif);
> int (*remove_dev)(struct device *dev, struct subsys_interface *sif);
> + const struct dev_pm_ops *pm;
> };
>
> int subsys_interface_register(struct subsys_interface *sif);
Any inputs?
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