The capability of IRQ remapping is abstracted on IOMMU side on
some archs. There is a existing flag IOMMU_CAP_INTR_REMAP for this.
To have a universal flag to test this capability for different
archs on PCI side, we set PCI_BUS_FLAGS_MSI_REMAP for PCI buses
when IOMMU_CAP_INTR_REMAP is set.
Signed-off-by: Yongji Xie <xyjxie@xxxxxxxxxxxxxxxxxx>
---
drivers/iommu/iommu.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 0e3b009..5d2b6f6 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -813,6 +813,16 @@ struct iommu_group *pci_device_group(struct device *dev)
return group;
}
+static void pci_check_msi_remapping(struct pci_dev *pdev,
+ const struct iommu_ops *ops)
+{
+ struct pci_bus *bus = pdev->bus;
+
+ if (ops->capable(IOMMU_CAP_INTR_REMAP) &&
+ !(bus->bus_flags & PCI_BUS_FLAGS_MSI_REMAP))
+ bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP;
+}
+
/**
* iommu_group_get_for_dev - Find or create the IOMMU group for a device
* @dev: target device
@@ -871,6 +881,9 @@ static int add_iommu_group(struct device *dev, void *data)
const struct iommu_ops *ops = cb->ops;
int ret;
+ if (dev_is_pci(dev) && ops->capable)
+ pci_check_msi_remapping(to_pci_dev(dev), ops);
+
if (!ops->add_device)
return 0;
@@ -913,6 +926,8 @@ static int iommu_bus_notifier(struct notifier_block *nb,
* result in ADD/DEL notifiers to group->notifier
*/
if (action == BUS_NOTIFY_ADD_DEVICE) {
+ if (dev_is_pci(dev) && ops->capable)
+ pci_check_msi_remapping(to_pci_dev(dev), ops);
if (ops->add_device)
return ops->add_device(dev);
} else if (action == BUS_NOTIFY_REMOVED_DEVICE) {
--
1.7.9.5
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