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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-08 18:37:23 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-08 18:37:23 +0200 |
| commit | 181e505952c5e4b4beb287d0022ea3cd20f23e74 (patch) | |
| tree | f0b3ab951cd0681ee772bc01ce6deae3983d3d1c /drivers | |
| parent | Merge branch 'for-4.1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git... (diff) | |
| parent | iommu/vt-d: Fix passthrough mode with translation-disabled devices (diff) | |
| download | linux-181e505952c5e4b4beb287d0022ea3cd20f23e74.tar.xz linux-181e505952c5e4b4beb287d0022ea3cd20f23e74.zip | |
Merge git://git.infradead.org/intel-iommu
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
18436afdc11a: "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
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 68d43beccb7e..2ffe58969944 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -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) { |