linux-kernel - Re: [PATCH v2 3/8] PCI/MSI: of: Add support for OF-provided msi

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Date:	Wed, 14 Jan 2015 10:19:18 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	"Yun Wu (Abel)" <wuyun.wu@...wei.com>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yijing Wang <wangyijing@...wei.com>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>
Subject: Re: [PATCH v2 3/8] PCI/MSI: of: Add support for OF-provided msi_domain

Hi Abel,

On 14/01/15 08:17, Yun Wu (Abel) wrote:
> On 2015/1/9 1:06, Marc Zyngier wrote:
> 
>> In order to populate the PHB msi_domain, use the "msi-parent"
>> attribute to lookup a corresponding irq domain. If found,
>> this is our MSI domain.
>>
>> This gets plugged into the core PCI code.
>>
> 
> Hi Marc,
> 
> Since the whole patch series based on the fact that non PCI type
> buses will use MSI-like interrupts, would it be better if getting
> this field settled during OF populating?

Are you're thinking of letting random platform devices automagically
gain an MSI domain as they are discovered by DT? I feel like you looking
at it the wrong way.

Note that DT discovery doesn't imply a particular bus, and non-PCI
doesn't mean bus-agnostic. MSI-like interrupts really are a bus
property, and I'd rather see you implementing support for your favourite
bus (and do the MSI domain matching there).

Thanks,

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