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of: Allow the iommu-map property to omit untranslated devices

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In PCI root complex nodes, the iommu-map property describes the IOMMU that
translates each endpoint. On some platforms, the IOMMU itself is presented
as a PCI endpoint (e.g. AMD IOMMU and virtio-iommu). This isn't supported
by the current OF driver, which expects all endpoints to have an IOMMU.
Allow the iommu-map property to have gaps.

Relaxing of_map_rid() also allows the msi-map property to have gaps, which
is invalid since MSIs always reach an MSI controller. In that case
pci_msi_setup_msi_irqs() will return an error when attempting to find the
device's MSI domain.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jean-Philippe Brucker 2019-01-15 12:19:55 +00:00 committed by Michael S. Tsirkin
parent 6c9e92ef8b
commit fb709b5e1c
1 changed files with 7 additions and 3 deletions
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10
drivers/of/base.c
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@ -2294,8 +2294,12 @@ int of_map_rid(struct device_node *np, u32 rid,
return 0;
}
pr_err("%pOF: Invalid %s translation - no match for rid 0x%x on %pOF\n",
np, map_name, rid, target && *target ? *target : NULL);
return -EFAULT;
pr_info("%pOF: no %s translation for rid 0x%x on %pOF\n", np, map_name,
rid, target && *target ? *target : NULL);
/* Bypasses translation */
if (id_out)
*id_out = rid;
return 0;
}
EXPORT_SYMBOL_GPL(of_map_rid);