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ioat2: catch and recover from broken vtd configurations v6

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On some platforms (MacPro3,1) the BIOS assigns the ioatdma device to the
incorrect iommu causing faults when the driver initializes.  Add a quirk
to catch this misconfiguration and try falling back to untranslated
operation (which works in the MacPro3,1 case).

Assuming there are other platforms with misconfigured iommus teach the
ioatdma driver to treat initialization failures as non-fatal (just fail
the driver load and emit a warning instead of triggering a BUG_ON).

This can be classified as a boot regression since 2.6.32 on affected
platforms since the ioatdma module did not autoload prior to that
kernel.

Cc: <[email protected]>
Acked-by: David Woodhouse <[email protected]>
Reported-by: Chris Li <[email protected]>
Tested-by: Chris Li <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2010-07-23 15:47:56 -07:00
commit 556ab45f9a
4 changed files with 55 additions and 3 deletions
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28
drivers/pci/intel-iommu.c
View file

@ -3029,6 +3029,34 @@ static void __init iommu_exit_mempool(void)
}
static void quirk_ioat_snb_local_iommu(struct pci_dev *pdev)
{
struct dmar_drhd_unit *drhd;
u32 vtbar;
int rc;
/* We know that this device on this chipset has its own IOMMU.
* If we find it under a different IOMMU, then the BIOS is lying
* to us. Hope that the IOMMU for this device is actually
* disabled, and it needs no translation...
*/
rc = pci_bus_read_config_dword(pdev->bus, PCI_DEVFN(0, 0), 0xb0, &vtbar);
if (rc) {
/* "can't" happen */
dev_info(&pdev->dev, "failed to run vt-d quirk\n");
return;
}
vtbar &= 0xffff0000;
/* we know that the this iommu should be at offset 0xa000 from vtbar */
drhd = dmar_find_matched_drhd_unit(pdev);
if (WARN_TAINT_ONCE(!drhd || drhd->reg_base_addr - vtbar != 0xa000,
TAINT_FIRMWARE_WORKAROUND,
"BIOS assigned incorrect VT-d unit for Intel(R) QuickData Technology device\n"))
pdev->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;
}
DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB, quirk_ioat_snb_local_iommu);
static void __init init_no_remapping_devices(void)
{
struct dmar_drhd_unit *drhd;