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Commit 973b5464 authored by Lu Baolu's avatar Lu Baolu Committed by Alex Williamson
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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: default avatarAshok Raj <ashok.raj@intel.com>
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent 2e2e35d5

drivers/iommu/dmar.c

+2 −1
Original line number Diff line number Diff line
@@ -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);

include/linux/intel-iommu.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */