linux-kernel - Re: [RFC Part4 v1 00/17] Refine support of non-PCI-compliant Message

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Date:	Wed, 12 Nov 2014 22:52:57 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <marc.zyngier@....com>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Yijing Wang <wangyijing@...wei.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC Part4 v1 00/17] Refine support of non-PCI-compliant Message

On 2014/11/12 22:46, Thomas Gleixner wrote:
> On Wed, 12 Nov 2014, Marc Zyngier wrote:
>> This patch introduces two optionnal fields to the msi_chip structure:
>> - a pointer to an irq domain, describing the MSI domain associated
>>   with this msi_chip. To be populated with msi_create_irq_domain.
>> - a domain_alloc_irqs() callback that has the same purpose as
>>   arch_setup_msi_irqs(), with the above domain as an additional
>>   parameter.
>>
>> If both of these fields are non-NULL, then domain_alloc_irqs() is
>> called, bypassing the setup_irq callback. This allows the MSI driver
>> to use the domain stacking feature without mandating core support in
>> the architecture.
> 
> I'd rather have the callback in the irqdomain itself. Along with a
> callback to free the interrupts.
> 
> AFAICT is msi_chip more or less a wrapper around the actual MSI irq
> domain. So we rather move towards assigning irqdomain to the pci bus
> and get rid of msi_chip instead of adding another level of obscure
> indirection through msi_chip.
Hi Thomas and Marc,

I'm trying to replace all weak functions , such as
arch_setup_msi_irqs()/arch_setup_msi_irq(), in drivers/pci/msi.c.

The framework core changes are almost ready, but it does take time
to convert current arch_setup_msi_irqs() implementations to new
irqdomain interfaces.

Not sure whether it's the right direction to go:(
Regards!
Gerry
> 
> Thanks,
> 
> 	tglx
> 
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