lkml.org 
[lkml]   [2020]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 0/2] Let pci_fixup_final access iommu_fwnode
From
Date


On 2020/5/25 下午9:43, Joerg Roedel wrote:
> On Tue, May 12, 2020 at 12:08:29PM +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.
>> So calling pci_fixup_final after iommu_fwnode is allocated.
>>
>> For example:
>> Hisilicon platform device need fixup in
>> drivers/pci/quirks.c
>>
>> +static void quirk_huawei_pcie_sva(struct pci_dev *pdev)
>> +{
>> + struct iommu_fwspec *fwspec;
>> +
>> + pdev->eetlp_prefix_path = 1;
>> + fwspec = dev_iommu_fwspec_get(&pdev->dev);
>> + if (fwspec)
>> + fwspec->can_stall = 1;
>> +}
>> +
>> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa250, quirk_huawei_pcie_sva);
>> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa251, quirk_huawei_pcie_sva);
> I don't think it is a great idea to hook this into PCI_FIXUP_FINAL. The
> fixup list needs to be processed for every device, which will slow down
> probing.
>
> So either we introduce something like PCI_FIXUP_IOMMU, if this is
> entirely PCI specific. If it needs to be generic we need some fixup
> infrastructure in the IOMMU code itself.

Thanks Joerg for the good suggestion.
I am trying to introduce PCI_FIXUP_IOMMU in
https://lkml.org/lkml/2020/5/26/366

Thanks

\
 
 \ /
  Last update: 2020-05-26 14:08    [W:0.222 / U:0.600 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site