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x86/amd-iommu: Fix boot crash with hidden PCI devices 

Some PCIe cards ship with a PCI-PCIe bridge which is not
visible as a PCI device in Linux. But the device-id of the
bridge is present in the IOMMU tables which causes a boot
crash in the IOMMU driver.
This patch fixes by removing these cards from the IOMMU
handling. This is a pure -stable fix, a real fix to handle
this situation appriatly will follow for the next merge
window.

Cc: stable@kernel.org	# > 2.6.32
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-06-06 16:50:14 +02:00
parent 27c2127a15
commit 26018874e3
1 changed files with 21 additions and 1 deletions
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22
arch/x86/kernel/amd_iommu.c
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@ -155,6 +155,10 @@ static int iommu_init_device(struct device *dev)
pdev = pci_get_bus_and_slot(PCI_BUS(alias), alias & 0xff);
if (pdev)
dev_data->alias = &pdev->dev;
else {
kfree(dev_data);
return -ENOTSUPP;
}
atomic_set(&dev_data->bind, 0);
@ -164,6 +168,20 @@ static int iommu_init_device(struct device *dev)
return 0;
}
static void iommu_ignore_device(struct device *dev)
{
u16 devid, alias;
devid = get_device_id(dev);
alias = amd_iommu_alias_table[devid];
memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry));
memset(&amd_iommu_dev_table[alias], 0, sizeof(struct dev_table_entry));
amd_iommu_rlookup_table[devid] = NULL;
amd_iommu_rlookup_table[alias] = NULL;
}
static void iommu_uninit_device(struct device *dev)
{
kfree(dev->archdata.iommu);
@ -193,7 +211,9 @@ int __init amd_iommu_init_devices(void)
continue;
ret = iommu_init_device(&pdev->dev);
if (ret)
if (ret == -ENOTSUPP)
iommu_ignore_device(&pdev->dev);
else if (ret)
goto out_free;
}