linux-kernel - Re: [PATCH 2/2] iommu: calling pci_fixup_iommu in iommu_fwspec

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Date:   Wed, 27 May 2020 11:01:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Zhangfei Gao <zhangfei.gao@...aro.org>
Cc:     Joerg Roedel <joro@...tes.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        jean-philippe <jean-philippe@...aro.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        kenneth-lee-2012@...mail.com, Wangzhou <wangzhou1@...ilicon.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-acpi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 2/2] iommu: calling pci_fixup_iommu in iommu_fwspec_init

On Tue, May 26, 2020 at 07:49:09PM +0800, Zhangfei Gao wrote:
> Calling pci_fixup_iommu in iommu_fwspec_init, which alloc
> iommu_fwnode. 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_iommu after iommu_fwnode is allocated.
> 
> Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>
> ---
>  drivers/iommu/iommu.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 7b37542..fb84c42 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -2418,6 +2418,10 @@ int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
>  	fwspec->iommu_fwnode = iommu_fwnode;
>  	fwspec->ops = ops;
>  	dev_iommu_fwspec_set(dev, fwspec);
> +
> +	if (dev_is_pci(dev))
> +		pci_fixup_device(pci_fixup_iommu, to_pci_dev(dev));

Why can't the caller do this as it "knows" it is a PCI device at that
point in time, right?

thanks,

greg k-h