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authorLu Baolu <baolu.lu@linux.intel.com>2017-11-03 10:51:33 -0600
committerAlex Williamson <alex.williamson@redhat.com>2017-11-03 10:51:33 -0600
commit973b546451fdf11e518cc96d1b137af893a38db5 (patch)
treecf60bbbf85f1a4dd632669c60119ea382a8decdc /drivers/iommu
parent2e2e35d512798193b4165ed884a5d1d9b181e231 (diff)
downloadblackbird-op-linux-973b546451fdf11e518cc96d1b137af893a38db5.tar.gz
blackbird-op-linux-973b546451fdf11e518cc96d1b137af893a38db5.zip
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>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/dmar.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 1ea7cd537873..9a7ffd13c7f0 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -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);
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