linux-kernel - Re: [RFC PATCH v2 01/12] Add sys_hotplug.h for system device hotplug framework

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1358177628.14145.49.camel@misato.fc.hp.com>
Date:	Mon, 14 Jan 2013 08:33:48 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	lenb@...nel.org, gregkh@...uxfoundation.org,
	akpm@...ux-foundation.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	bhelgaas@...gle.com, isimatu.yasuaki@...fujitsu.com,
	jiang.liu@...wei.com, wency@...fujitsu.com, guohanjun@...wei.com,
	yinghai@...nel.org, srivatsa.bhat@...ux.vnet.ibm.com
Subject: Re: [RFC PATCH v2 01/12] Add sys_hotplug.h for system device
 hotplug framework

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/