[Patch V1 0/6] Refine generic/PCI MSI irqodmian interfaces

Jiang Liu jiang.liu at linux.intel.com
Fri Nov 14 07:25:13 PST 2014

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.
> Thanks,
> 	M.

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