linux-kernel - RE: [RFC 12/17] irq: bypass: Extend skeleton for ARM forwarding control

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Date:	Fri, 3 Jul 2015 07:16:17 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Paolo Bonzini <pbonzini@...hat.com>,
	Eric Auger <eric.auger@...aro.org>,
	"eric.auger@...com" <eric.auger@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"marc.zyngier@....com" <marc.zyngier@....com>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"avi.kivity@...il.com" <avi.kivity@...il.com>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"joro@...tes.org" <joro@...tes.org>,
	"b.reynal@...tualopensystems.com" <b.reynal@...tualopensystems.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [RFC 12/17] irq: bypass: Extend skeleton for ARM forwarding
 control



> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@...hat.com]
> Sent: Friday, July 03, 2015 3:06 PM
> To: Wu, Feng; Eric Auger; eric.auger@...com;
> linux-arm-kernel@...ts.infradead.org; kvmarm@...ts.cs.columbia.edu;
> kvm@...r.kernel.org; christoffer.dall@...aro.org; marc.zyngier@....com;
> alex.williamson@...hat.com; avi.kivity@...il.com; mtosatti@...hat.com;
> joro@...tes.org; b.reynal@...tualopensystems.com
> Cc: linux-kernel@...r.kernel.org; patches@...aro.org
> Subject: Re: [RFC 12/17] irq: bypass: Extend skeleton for ARM forwarding
> control
> 
> 
> 
> On 03/07/2015 09:00, Wu, Feng wrote:
> >>> > > struct irq_bypass_consumer {
> >>> > >        struct list_head node;
> >>> > >        void *token;
> >>> > > +      unsigned irq;	/*got from producer when registered*/
> >>> > >        void (*add_producer)(struct irq_bypass_producer *,
> >>> > >                             struct irq_bypass_consumer *);
> >>> > >        void (*del_producer)(struct irq_bypass_producer *,
> >>> > >                             struct irq_bypass_consumer *);
> >>> > > +      void (*update)(struct irq_bypass_consumer *);
> >>> > > };
> >>> > >
> >>> > > 'update' is used to update the IRTE, while irq is initialized when
> >>> > > registered, which is used to find the right IRTE.
> >> >
> >> > Feel free to add "update" in your PI patches.  I am not sure if "irq"
> >> > belongs here or in the containing struct.  You can play with both and
> >> > submit the version that looks better to you.
> > Thanks for your review, Paolo. In my understanding, irq comes from
> > the producer side, while gsi belongs to the consumer, so we need
> > to get the irq from the producer somewhere. I am not sure adding
> > irq here is the good way, but what I need is in the 'update' function,
> > I have irq, gsi in hand. :)
> 
> It's difficult to say without seeing the patches...  The IRQ is stored
> in the producer already with Eric's changes.  If you need to store the
> old IRQ value, because "update" needs to do something with it, then I
> think "irq" belongs in the container struct.
> 
> Perhaps "update" needs to have a producer argument as well?

I also consider this method, basically, I will call 'update' in irqfd_update(),
but seems I need do extra things to get the producer structure (such as,
iterate the producer list to find the one with the same 'token') before
calling 'update' from consumer side. I am not sure it is worth doing
that way.

Thanks,
Feng

> 
> Paolo
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