Re: [PATCH 1/2] PCI: Introduce PCI_FIXUP_IOMMU

Zhangfei Gao
2020-05-26T15:10:45Z

Hi, Christoph

On 2020/5/26 下午10:46, Christoph Hellwig wrote:
> On Tue, May 26, 2020 at 07:49:08PM +0800, Zhangfei Gao wrote:
>> Some platform devices appear as PCI but are actually on the AMBA bus,
>> and they need fixup in drivers/pci/quirks.c handling iommu_fwnode.
>> Here introducing PCI_FIXUP_IOMMU, which is called after iommu_fwnode
>> is allocated, instead of reusing PCI_FIXUP_FINAL since it will slow
>> down iommu probing as all devices in fixup final list will be
>> reprocessed.
> Who is going to use this? I don't see a single user in the series.
We will add iommu fixup in drivers/pci/quirks.c, handling

fwspec->can_stall, which is introduced in

https://www.spinics.net/lists/linux-pci/msg94559.html

Unfortunately, the patch does not catch v5.8, so we have to wait.
And we want to check whether this is a right method to solve this issue.

Thanks