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

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Date:	Fri, 14 Nov 2014 16:03:41 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
CC:	Yijing Wang <wangyijing0307@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yijing Wang <wangyijing@...wei.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 14/11/14 15:25, Jiang Liu wrote:
> On 2014/11/14 23:16, Marc Zyngier wrote:
>> On 14/11/14 14:26, Jiang Liu wrote:
>>> On 2014/11/14 22:11, Yijing Wang wrote:
>>>>
>>> We have achieved 1 and 2. And seems we could also achieve 3 by
>>> converting all arch specific PCI MSI code to use hierarchy
>>> irqdomain. But not sure whether we could achieve 4, not familiar
>>> with ARM world:)
>>
>> Killing all the weak functions shouldn't be a problem for ARM, we're
>> trying very hard not to rely on them.
>>
>> Killing msi_chip is a different story, as this is what we use to match a
>> PCI host controller with its MSI controller (that's what the of_node
>> field in msi_chip is for). See drivers/of/of_pci.c for details.
>>
>> Also, we use msi_chip directly in the MSI drivers as a way to go from a
>> pci_dev to the MSI controller specific structure:
>>
>> http://git.kernel.org/cgit/linux/kernel/git/maz/arm-platforms.git/tree/drivers/irqchip/irq-gic-v3-its.c?h=irq/stacked-its-v2#n1143
>>
>> If we're going to kill msi_chip, we must make sure we have mechanisms
>> that allow the conversion of the existing code.
> Hi Marc,
> 	Seem it doesn't worth the effort to remove irq_chip,
> so I will focus on killing all weak functions first:)
> After that, we may kill setup_irq and teardown_irq in irq_chip,
> but seems irq_chip still has other usages, so I won't try to
> kill irq_chip.

I assume you mean msi_chip! ;-)

Killing setup/teardown_irq is going to require some work. There are a
few users in the tree (I can see three in drivers/pci/host and one in
drivers/irqchip).

Hopefully, we can get the maintainers to convert them.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...

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