linux-kernel - Re: Userspace I/O driver core

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Message-ID: <45811D0F.2070705@argo.co.il>
Date:	Thu, 14 Dec 2006 11:44:47 +0200
From:	Avi Kivity <avi@...o.co.il>
To:	Greg KH <greg@...ah.com>
CC:	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: Userspace I/O driver core

Greg KH wrote:
> A large number of people have expressed interest recently in the
> userspace i/o driver core which allows userspace drivers to be written
> to handle some types of hardware.
>
> Right now the UIO core is working and in the -mm releases.  It's been
> rewritten from the last time patches were posted to lkml and is much
> simpler.  It also includes full documentation and two example drivers
> and two example userspace programs that test those drivers.
>
> But in order to get this core into the kernel tree, we need to have some
> "real" drivers written that use it.  So, for anyone that wants to see
> this go into the tree, now is the time to step forward and post your
> patches for hardware that this kind of driver interface is needed.
>
>   
[...]

> If anyone has any questions on how to use this interface, or anything
> else about it, please let me and Thomas know.
>
>   

I understand one still has to write a kernel driver to shut up the irq.  
How about writing a small bytecode interpreter to make event than 
unnecessary?

The userspace driver would register a couple of bytecode programs: 
is_interrupt_pending() and disable_interrupt(), which the uio framework 
would call when the interrupt fires.

The bytecode could reuse net/core/filter.c, with the packet replaced by 
the mmio or ioregion, or use something new.

-- 
error compiling committee.c: too many arguments to function

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