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iommu/of: Support ats-supported device-tree property

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Device-tree declares whether a PCI root-complex supports ATS by setting
the "ats-supported" property. Copy this flag into device fwspec to let
IOMMU drivers quickly check if they can enable ATS for a device.

Tested-by: Ketan Patil <ketanp@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Link: https://lore.kernel.org/r/20240607105415.2501934-4-jean-philippe@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Jean-Philippe Brucker 2024-06-07 11:54:15 +01:00 committed by Will Deacon
parent 40929e8e54
commit 86e02a88be
1 changed files with 9 additions and 0 deletions
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9
drivers/iommu/of_iommu.c
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@ -105,6 +105,14 @@ static int of_iommu_configure_device(struct device_node *master_np,
of_iommu_configure_dev(master_np, dev);
}
static void of_pci_check_device_ats(struct device *dev, struct device_node *np)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
if (fwspec && of_property_read_bool(np, "ats-supported"))
fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;
}
/*
* Returns:
* 0 on success, an iommu was configured
@ -147,6 +155,7 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np,
pci_request_acs();
err = pci_for_each_dma_alias(to_pci_dev(dev),
of_pci_iommu_init, &info);
of_pci_check_device_ats(dev, master_np);
} else {
err = of_iommu_configure_device(master_np, dev, id);
}