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authorSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>2013-03-27 18:51:52 -0500
committerJoerg Roedel <joro@8bytes.org>2013-04-02 16:48:20 +0200
commit925fe08bce38d1ff052fe2209b9e2b8d5fbb7f98 (patch)
tree603e1fa952b9a839ec20a8aab04246c843a5bd5b /drivers/iommu
parent07961ac7c0ee8b546658717034fe692fd12eefa9 (diff)
downloadop-kernel-dev-925fe08bce38d1ff052fe2209b9e2b8d5fbb7f98.zip
op-kernel-dev-925fe08bce38d1ff052fe2209b9e2b8d5fbb7f98.tar.gz
iommu/amd: Re-enable IOMMU event log interrupt after handling.
Current driver does not clear the IOMMU event log interrupt bit in the IOMMU status register after processing an interrupt. This causes the IOMMU hardware to generate event log interrupt only once. This has been observed in both IOMMU v1 and V2 hardware. This patch clears the bit by writing 1 to bit 1 of the IOMMU status register (MMIO Offset 2020h) Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd_iommu.c3
-rw-r--r--drivers/iommu/amd_iommu_types.h1
2 files changed, 4 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b287ca3..d6433e2 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -703,6 +703,9 @@ static void iommu_poll_events(struct amd_iommu *iommu)
u32 head, tail;
unsigned long flags;
+ /* enable event interrupts again */
+ writel(MMIO_STATUS_EVT_INT_MASK, iommu->mmio_base + MMIO_STATUS_OFFSET);
+
spin_lock_irqsave(&iommu->lock, flags);
head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index e38ab43..083f98c 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -99,6 +99,7 @@
#define PASID_MASK 0x000fffff
/* MMIO status bits */
+#define MMIO_STATUS_EVT_INT_MASK (1 << 1)
#define MMIO_STATUS_COM_WAIT_INT_MASK (1 << 2)
#define MMIO_STATUS_PPR_INT_MASK (1 << 6)
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