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iommu/arm-smmu: preserve the far during fault handling

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We're currently wiping out the `far' variable in our context fault
handler when CONFIG_64BIT is enabled.  Fix the bug.

Change-Id: I86e57c7de8bfc10118f902d6702d3b9059a8762a
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
This commit is contained in:
Mitchel Humpherys 2015-02-20 15:54:11 -08:00 • committed by David Keitel
parent 94c0e12871
commit 923ea2cbed
1 changed files with 4 additions and 5 deletions
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9
drivers/iommu/arm-smmu.c
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@ -848,8 +848,8 @@ static phys_addr_t arm_smmu_iova_to_phys_soft(struct iommu_domain *domain,
static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
{
int flags, ret;
u32 fsr, far, fsynr, resume;
unsigned long iova;
u32 fsr, fsynr, resume;
unsigned long iova, far;
struct iommu_domain *domain = dev;
struct arm_smmu_domain *smmu_domain = domain->priv;
struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
@ -880,11 +880,10 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
flags = fsynr & FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ;
far = readl_relaxed(cb_base + ARM_SMMU_CB_FAR_LO);
iova = far;
#ifdef CONFIG_64BIT
far = readl_relaxed(cb_base + ARM_SMMU_CB_FAR_HI);
iova |= ((unsigned long)far << 32);
far |= ((u64)readl_relaxed(cb_base + ARM_SMMU_CB_FAR_HI)) << 32;
#endif
iova = far;
phys_soft = arm_smmu_iova_to_phys_soft(domain, iova);
if (!report_iommu_fault(domain, smmu->dev, iova, flags)) {