linux-kernel - Re: [Patch V1 0/6] Refine generic/PCI MSI irqodmian interfaces

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Date:	Fri, 14 Nov 2014 13:13:03 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
cc:	Yijing Wang <wangyijing@...wei.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Patch V1 0/6] Refine generic/PCI MSI irqodmian interfaces

On Fri, 14 Nov 2014, Jiang Liu wrote:
> On 2014/11/14 9:31, Thomas Gleixner wrote:
> > On Fri, 14 Nov 2014, Yijing Wang wrote:
> > 
> > Could you please use a mail client which does proper line wraps or
> > configure yours to do so?
> > 
> >> Associate the irq domain and PCI bus is not necessary, because all
> >> PCI buses under same host bridge always share same MSI chip/irq
> >> domain, we only need associate them and pci host bridge.
> >>
> >> I'm refactoring the pci_host_bridge, make it be a generic one, rip
> >> out of the pci root bus creation, so we could put the irq domain and
> >> pci domain etc.. in it. Finally, we could eliminate lots platform
> >> arch functions. I will post it out within one week.
> > 
> > That's a completely orthogonal problem. From the MSI/interrupt
> > handling POV it does not matter at all where that information is
> > stored. All we care about is that it is retrievable via the (pci)
> > device which tries to setup MSI[X].
> > 
> > So we can store/retrieve it via generic functions into/from whatever
> > is available right now. If the irq side has generic interfaces to do
> > so then this wont conflict with your decisions to change the final
> > storage point because all it takes is to tweak the storage/retrieve
> > functions.
> > 
> > So all we need at the moment is an agreed on way to store/retrieve
> > that information which is based on the current shared infrastructure,
> > aka. Linus tree. If we can utilize that you are completely free to
> > change the association mechanism underneath.
> Hi Thomas,
> 	So we need something like:
> struct msi_chip *pci_get_msi_chip(struct pci_dev *);
> or:
> struct irq_domain *pci_get_msi_domain(struct pci_dev *);
> 
> BTW, there's a conflict when merging tip/irq/irqdomain into
> tip/x86/apic. It's my first time to deal with merging conflicts,
> what's the preferred way? Is it working like this?
> 1) I merge the two branch
> 2) I rebase my x86 irqdomain patch sets and send them to you
> 3) You merge the two branch and apply my patch set.

When we have the generic parts sorted out, i'll make the irq/irqdomain
branch official and immutable and then merge it into x86/apic fix the
conflicts and add the x86 specific stuff on top.

Thanks,

	tglx
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