linux-kernel - Re: [RFC PATCH 00/13] firmware loader: introduce cache/uncache firmware

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Message-ID: <CACVXFVN+nfeurwFoHLK0T2OhPG56ZzTi8mXfbsomcB0YWgkviA@mail.gmail.com>
Date:	Wed, 25 Jul 2012 01:08:36 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Borislav Petkov <borislav.petkov@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 00/13] firmware loader: introduce cache/uncache firmware

On Wed, Jul 25, 2012 at 1:00 AM, Ming Lei <ming.lei@...onical.com> wrote:
> Hi,
>
> In [1][2], the problem below has been discussed for some time:
>
>         device's firmware may be lost during suspend/resume
>         cycle because device is unplugged and plugged again
>         or device experiences system power loss in the period.
>         but during resume path, system is still not ready(process
>         frozen, rootfs not usable, ...) to complete loading firmware
>         from user space for the device
>
> The conclusion is that caching firmware during suspend/resume cycle
> is capable of solving the problem.
>
> This patchset implements cache/uncache firmware mechanism,
> and apply the mechnism to cache device's firmware in kernel memory
> space automatically during suspend/resume cyclye, so device can
> load its firmware easily during resume path. When resume is completed
> and system is ready, the cached firmwares will be removed from
> kernel memory later.

$git diff --stat
 drivers/base/devres.c         |   42 +++
 drivers/base/firmware_class.c |  749 +++++++++++++++++++++++++++++++++++------
 include/linux/device.h        |    3 +
 include/linux/firmware.h      |   15 +
 4 files changed, 705 insertions(+), 104 deletions(-)


Thanks,
--
Ming Lei
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