On Fri, 2013-01-11 at 22:23 +0100, Rafael J. Wysocki wrote:
> On Thursday, January 10, 2013 04:40:19 PM Toshi Kani wrote:
> > Added include/linux/sys_hotplug.h, which defines the system device
> > hotplug framework interfaces used by the framework itself and
> > handlers.
> >
> > The order values define the calling sequence of handlers. For add
> > execute, the ordering is ACPI->MEM->CPU. Memory is onlined before
> > CPU so that threads on new CPUs can start using their local memory.
> > The ordering of the delete execute is symmetric to the add execute.
> >
> > struct shp_request defines a hot-plug request information. The
> > device resource information is managed with a list so that a single
> > request may target to multiple devices.
> >
:
> > +
> > +struct shp_device {
> > + struct list_head list;
> > + struct device *device;
> > + enum shp_class class;
> > + union shp_dev_info info;
> > +};
> > +
> > +/*
> > + * Hot-plug request
> > + */
> > +struct shp_request {
> > + /* common info */
> > + enum shp_operation operation; /* operation */
> > +
> > + /* hot-plug event info: only valid for hot-plug operations */
> > + void *handle; /* FW handle */
>
> What's the role of handle here?
On ACPI-based platforms, the handle keeps a notified ACPI handle when a
hot-plug request is made. ACPI bus handlers, acpi_add_execute() /
acpi_del_execute(), then scans / trims ACPI devices from the handle.
Thanks,
-Toshi
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