From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jiang Liu <jiang.liu@linux.intel.com>
Subject: Re: [RFC Part4 v1 00/17] Refine support of non-PCI-compliant Message
Date: Wed, 12 Nov 2014 22:52:57 +0800
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To: Thomas Gleixner <tglx@linutronix.de>, Marc Zyngier <marc.zyngier@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Randy Dunlap <rdunlap@infradead.org>, Yinghai Lu <yinghai@kernel.org>, Borislav Petkov <bp@alien8.de>, "grant.likely@linaro.org" <grant.likely@linaro.org>, Yingjoe Chen <yingjoe.chen@mediatek.com>, Matthias Brugger <matthias.bgg@gmail.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Andrew Morton <akpm@linux-foundation.org>, Tony Luck <tony.luck@intel.com>, Joerg Roedel <joro@8bytes.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Yijing Wang <wangyijing@huawei.com>, "x86@kernel.org" <x86@kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>, "linux-acpi@vger.kernel.org" <linux-acpi@vg>

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
>