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amd_iommu: Support IOMMU groups 

Add IOMMU group support to AMD-Vi device init and uninit code.
Existing notifiers make sure this gets called for each device.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Alex Williamson 2012-05-30 14:19:07 -06:00 committed by Joerg Roedel
parent d72e31c937
commit 9dcd61303a
1 changed files with 23 additions and 1 deletions
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24
drivers/iommu/amd_iommu.c
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@ -256,9 +256,11 @@ static bool check_device(struct device *dev)
static int iommu_init_device(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct pci_dev *dma_pdev, *pdev = to_pci_dev(dev);
struct iommu_dev_data *dev_data;
struct iommu_group *group;
u16 alias;
int ret;
if (dev->archdata.iommu)
return 0;
@ -279,8 +281,26 @@ static int iommu_init_device(struct device *dev)
return -ENOTSUPP;
}
dev_data->alias_data = alias_data;
dma_pdev = pci_get_bus_and_slot(alias >> 8, alias & 0xff);
} else
dma_pdev = pci_dev_get(pdev);
group = iommu_group_get(&dma_pdev->dev);
pci_dev_put(dma_pdev);
if (!group) {
group = iommu_group_alloc();
if (IS_ERR(group))
return PTR_ERR(group);
}
ret = iommu_group_add_device(group, dev);
iommu_group_put(group);
if (ret)
return ret;
if (pci_iommuv2_capable(pdev)) {
struct amd_iommu *iommu;
@ -309,6 +329,8 @@ static void iommu_ignore_device(struct device *dev)
static void iommu_uninit_device(struct device *dev)
{
iommu_group_remove_device(dev);
/*
* Nothing to do here - we keep dev_data around for unplugged devices
* and reuse it when the device is re-plugged - not doing so would