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authorJoerg Roedel <joerg.roedel@amd.com>2011-12-22 14:51:53 +0100
committerJoerg Roedel <joerg.roedel@amd.com>2011-12-22 14:56:56 +0100
commit1456e9d2c4667a6e9221eda27b9648fb3bcc1e8e (patch)
tree6ef0a4f1ba7d25c97babd5a0f2a41db068150281 /drivers/iommu/amd_iommu_init.c
parent2655d7a29703f29d4b6b8e4ee1f4d682b3b28f9c (diff)
iommu/amd: Set IOTLB invalidation timeout
To protect the command buffer from hanging when a device does not respond to an IOTLB invalidation, set a timeout of 1s for outstanding IOTLB invalidations. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
-rw-r--r--drivers/iommu/amd_iommu_init.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 38784733cbb..bdea288dc18 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -306,6 +306,16 @@ static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
}
+static void iommu_set_inv_tlb_timeout(struct amd_iommu *iommu, int timeout)
+{
+ u32 ctrl;
+
+ ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
+ ctrl &= ~CTRL_INV_TO_MASK;
+ ctrl |= (timeout << CONTROL_INV_TIMEOUT) & CTRL_INV_TO_MASK;
+ writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
+}
+
/* Function to enable the hardware */
static void iommu_enable(struct amd_iommu *iommu)
{
@@ -1300,6 +1310,9 @@ static void iommu_init_flags(struct amd_iommu *iommu)
* make IOMMU memory accesses cache coherent
*/
iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
+
+ /* Set IOTLB invalidation timeout to 1s */
+ iommu_set_inv_tlb_timeout(iommu, CTRL_INV_TO_1S);
}
static void iommu_apply_resume_quirks(struct amd_iommu *iommu)