linux-kernel - Re: [PATCH v9 02/12] PCI: OF: Parse and map the IRQ when adding the PCI device.

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Date:	Tue, 19 Aug 2014 09:44:01 +0800
From:	Wei Yang <weiyang@...ux.vnet.ibm.com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Liviu Dudau <Liviu.Dudau@....com>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Will Deacon <Will.Deacon@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Arnd Bergmann <arnd@...db.de>,
	Russell King <linux@....linux.org.uk>,
	Tanmay Inamdar <tinamdar@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Sinan Kaya <okaya@...eaurora.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	linux-pci <linux-pci@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Device Tree ML <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 02/12] PCI: OF: Parse and map the IRQ when adding the
 PCI device.

On Mon, Aug 18, 2014 at 03:25:50PM +0100, Catalin Marinas wrote:
>...
>> Well, it will become necessary as old code gets dismantled and converted towards
>> this patchset. To give you an example that I'm familiar with, for arch/arm the
>> host bridge drivers have moved into drivers/pci/host, but they still depend/use
>> the bios32 infrastructure that takes care of setting up the irq. When they switch
>> to my version they would have to go and debug the "irq not being assigned" issue
>> and it is quite likely that some of the people doing the conversion will complain
>> about my code rather than understanding the issue. What I'm trying to do is to
>> make switching to my patchset as painless as possible, with a cleanup to remove
>> redundant operations coming after the switchover.
>
>While the goal is fine, until we see a common pattern for what needs to
>go into pcibios_add_device() I think we should have an arm64-specific
>implementation (and probably an arm32 specific one as well). I can see
>powerpc uses it for setting the DMA ops. Would we have a similar need on
>arm64 to choose between coherent and non-coherent dma_ops?

Liviu,

I have the same feeling with Catalin. An arm64-specific implementation of
pcibios_add_device() would be better.

No more other concerns from my side.

>
>Also at some point we'll get ACPI support, so I'm not sure what we do
>with assigning the dev->irq here but definitely of_* functions won't
>work.
>
>-- 
>Catalin

-- 
Richard Yang
Help you, Help me

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