linux-kernel - Re: [RFC patch] genirq threading (v2) for ehci, ohci and uhci USB hosts and ohci1394

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Date:	Tue, 21 Oct 2008 03:29:26 -0700
From:	Sven-Thorsten Dietrich <sven@...bigcorporation.com>
To:	Jonathan Woithe <jwoithe@...sics.adelaide.edu.au>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Veen <arjan@...radead.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jon Masters <jonathan@...masters.org>,
	slert-devel <slert-devel@...e.de>,
	Daniel Walker <dwalker@....ucsc.edu>,
	RT Users List <linux-rt-users@...r.kernel.org>
Subject: Re: [RFC patch] genirq threading (v2) for ehci, ohci and uhci USB
	hosts and ohci1394

On Tue, 2008-10-21 at 11:37 +0930, Jonathan Woithe wrote:
> Hi
> 
> > > This patch series implements support for threaded irq handlers for the
> > > generic IRQ layer.
> >
> > Subject: genirq threading for ehci, ohci and uhci USB hosts.
> > 
> > This is a functional POC for partitioning of the USB interrupt handlers into
> > a quickcheck function and a threaded main-handler function.
> > :
> > The ieee1394/ohci1394.c is a bit more problematic, since it does not use
> > struct usb_hcd, and therefore another place for the status cache must be found,
> > in struct ti_ohci presumably. 
> > I will send a separate patch for ieee1394/ohci1394.c after looking at it more.
> 
> Thanks for sending this through; I will endeavour to test it over the coming
> days.  I'll also see if I can test it for the case where USB and ieee1394
> share IRQs.  Even though ieee1394 isn't done yet these changes should
> prevent the USB-related problems we've seen in FFADO when USB shares the
> firewire IRQ.
> 
> Having said that, the forthcoming ohci1394.c patch will also be interesting
> since that is the other area which will greatly benefit FFADO.
> 

Hi, 

I have re-released the patch set with support for ohci1394. 

I have not tested, for lack of hardware :: it compiles.

The location of status_cache is now within the ti_ohci struct.

That organization not entirely consistent with the USB side, predicated
by other variation between the drivers.

The updated patch queue is available here.

http://www.thebigcorporation.com/Sven/genirq-usb/genirq-usb-v2.tar.bz2

Bug fix:
The declaration of status_cache has been made consistent u32. 
The former declaration of unsigned short (copied from uhci-hcd.c) it was
probably too ambiguous for some architectures.

Thanks,

Sven


> Regards
>   jonathan

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