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iommu/vt-d: Clear Page Request Overflow fault bit 

Currently Page Request Overflow bit in IOMMU Fault Status register
is not cleared. Not clearing this bit would mean that any  future
page-request is going to be automatically dropped by IOMMU.

Suggested-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Lu Baolu 2017-11-03 10:51:33 -06:00 committed by Alex Williamson
parent 2e2e35d512
commit 973b546451
2 changed files with 3 additions and 1 deletions
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3
drivers/iommu/dmar.c
View File

@ -1679,7 +1679,8 @@ irqreturn_t dmar_fault(int irq, void *dev_id)
raw_spin_lock_irqsave(&iommu->register_lock, flag);
}
writel(DMA_FSTS_PFO | DMA_FSTS_PPF, iommu->reg + DMAR_FSTS_REG);
writel(DMA_FSTS_PFO | DMA_FSTS_PPF | DMA_FSTS_PRO,
iommu->reg + DMAR_FSTS_REG);
unlock_exit:
raw_spin_unlock_irqrestore(&iommu->register_lock, flag);

1
include/linux/intel-iommu.h
View File

@ -212,6 +212,7 @@
#define DMA_FSTS_IQE (1 << 4)
#define DMA_FSTS_ICE (1 << 5)
#define DMA_FSTS_ITE (1 << 6)
#define DMA_FSTS_PRO (1 << 7)
#define dma_fsts_fault_record_index(s) (((s) >> 8) & 0xff)
/* FRCD_REG, 32 bits access */