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Subject: Re: [PATCH 0/2] Let pci_fixup_final access iommu_fwnode
To:     Joerg Roedel <joro@8bytes.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Hanjun Guo <guohanjun@huawei.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Len Brown <lenb@kernel.org>,
        jean-philippe <jean-philippe@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        kenneth-lee-2012@foxmail.com, Wangzhou <wangzhou1@hisilicon.com>,
        linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
        iommu@lists.linux-foundation.org, linux-acpi@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
References: <1589256511-12446-1-git-send-email-zhangfei.gao@linaro.org>
 <20200525134318.GB5221@8bytes.org>
From:   Zhangfei Gao <zhangfei.gao@linaro.org>
Message-ID: <7c6e9389-c34a-4d30-bc8d-572c41572d15@linaro.org>
Date:   Tue, 26 May 2020 20:07:01 +0800
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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