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Merge git://git.infradead.org/intel-iommu

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Pull Intel IOMMU fix from David Woodhouse:
 "This fixes an oops when attempting to enable 1:1 passthrough mode for
  devices on which VT-d translation was disabled anyway.

  It's actually a long-standing bug but recent changes (commit
  18436afdc1: "iommu/vt-d: Allow RMRR on graphics devices too") have
  made it much easier to trigger with 'iommu=pt intel_iommu=igfx_off' on
  the command line"

* git://git.infradead.org/intel-iommu:
  iommu/vt-d: Fix passthrough mode with translation-disabled devices
This commit is contained in:
Linus Torvalds 2015-06-08 09:37:23 -07:00
commit 181e505952
1 changed files with 8 additions and 5 deletions
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13
drivers/iommu/intel-iommu.c
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@ -696,6 +696,11 @@ static inline struct context_entry *iommu_context_addr(struct intel_iommu *iommu
return &context[devfn];
}
static int iommu_dummy(struct device *dev)
{
return dev->archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO;
}
static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn)
{
struct dmar_drhd_unit *drhd = NULL;
@ -705,6 +710,9 @@ static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devf
u16 segment = 0;
int i;
if (iommu_dummy(dev))
return NULL;
if (dev_is_pci(dev)) {
pdev = to_pci_dev(dev);
segment = pci_domain_nr(pdev->bus);
@ -2969,11 +2977,6 @@ static inline struct dmar_domain *get_valid_domain_for_dev(struct device *dev)
return __get_valid_domain_for_dev(dev);
}
static int iommu_dummy(struct device *dev)
{
return dev->archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO;
}
/* Check if the dev needs to go through non-identity map and unmap process.*/
static int iommu_no_mapping(struct device *dev)
{