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>

2 files changed, 23 insertions, 0 deletions

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 38784733cbb4..bdea288dc185 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)
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 6ad8b10b3130..2452f3b71736 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -127,6 +127,7 @@
 #define CONTROL_EVT_LOG_EN      0x02ULL
 #define CONTROL_EVT_INT_EN      0x03ULL
 #define CONTROL_COMWAIT_EN      0x04ULL
+#define CONTROL_INV_TIMEOUT     0x05ULL
 #define CONTROL_PASSPW_EN       0x08ULL
 #define CONTROL_RESPASSPW_EN    0x09ULL
 #define CONTROL_COHERENT_EN     0x0aULL
@@ -137,6 +138,15 @@
 #define CONTROL_PPR_EN          0x0fULL
 #define CONTROL_GT_EN           0x10ULL
 
+#define CTRL_INV_TO_MASK        (7 << CONTROL_INV_TIMEOUT)
+#define CTRL_INV_TO_NONE        0
+#define CTRL_INV_TO_1MS         1
+#define CTRL_INV_TO_10MS        2
+#define CTRL_INV_TO_100MS       3
+#define CTRL_INV_TO_1S          4
+#define CTRL_INV_TO_10S         5
+#define CTRL_INV_TO_100S        6
+
 /* command specific defines */
 #define CMD_COMPL_WAIT          0x01
 #define CMD_INV_DEV_ENTRY       0x02