Re: Rework of request firmware

[Kay Sievers <kay.sievers@vrfy.org>]

On Sun, 2005-03-20 at 12:19 -0500, David Zeuthen wrote:
> Hey Kay,
> 
> On Sun, 2005-03-20 at 14:37 +0100, Kay Sievers wrote:
> > before we start hacking on it. The current request_firmware() is a
> > not-so-nice example for doing it that way. All that stuff needs to play
> > with hotplug, initramfs/bootup, suspend/resume. And we should come up
> > with something that fits _all_ the needs and move the current
> > request_firmware-users over to it.
> 
> On that topic, one of the things I'd like a future scheme to do is not
> only emitting the request_firmware() event, but also emitting events
> like someone_uploaded_firmware() and timeout_waiting_for_firmware().
> Plus some state in sysfs to keep track of the state. All but
> request_firmware() probably don't need hotplug events; kobject_uevents
> would be fine for me, since I'd want some daemon to listen to it anyway.

We need to cover the early boot and initramfs anyway and therefore need
to fork something here. But that will be tunneled
through /proc/sys/kernel/hotplug, so if userspace has taken over the
hotplug events, it can switch that off and get everything from the
netlink events.

> All that probably needs to be changed to fit in with what Jon is doing;
> the idea here is that we want to notify the user, in the desktop
> session, that the firmware/initialization needed is not available. Then
> the user can take appropriate action. 

Hmm, we will need a sane way to propagate errors form the kernel to
userspace anyway. Currently there is nothing like that available and I
really see the need for a more generic solution then reading dmesg. :)

Remember the block I/O errors we wanted to send over netlink. We need
something more generic here, that is able to relay classes of errors and
error-data to userspace. That errors would be nice to catch with HAL and
give them a sane context to be handled in userspace.

Everything else will just be another dirty hack, I think.

Thanks,
Kay



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