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>
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 3878473..bdea288 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -306,6 +306,16 @@
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 @@
* 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)