[RFC v16 8/9] iommu/smmuv3: report additional recoverable faults

[Eric Auger]

Up to now we have only reported translation faults. Now that
the guest can induce some configuration faults, let's report them
too. Add propagation for BAD_SUBSTREAMID, CD_FETCH, BAD_CD, WALK_EABT.
We also fix the transcoding for some existing translation faults.

Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>

---

v14 -> v15:
- adapt to removal of IOMMU_FAULT_UNRECOV_FETCH_ADDR_VALID
  in [PATCH v13 10/10] iommu/arm-smmu-v3: Add stall support for
  platform devices
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 40 +++++++++++++++++++--
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  4 +++
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index e84a7c3e8730..ddfc069c10ae 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1488,6 +1488,7 @@ static int arm_smmu_handle_evt(struct arm_smmu_device *smmu, u64 *evt)
 	u32 perm = 0;
 	struct arm_smmu_master *master;
 	bool ssid_valid = evt[0] & EVTQ_0_SSV;
+	u8 type = FIELD_GET(EVTQ_0_ID, evt[0]);
 	u32 sid = FIELD_GET(EVTQ_0_SID, evt[0]);
 	struct iommu_fault_event fault_evt = { };
 	struct iommu_fault *flt = &fault_evt.fault;
@@ -1540,8 +1541,6 @@ static int arm_smmu_handle_evt(struct arm_smmu_device *smmu, u64 *evt)
 	} else {
 		flt->type = IOMMU_FAULT_DMA_UNRECOV;
 		flt->event = (struct iommu_fault_unrecoverable) {
-			.reason = reason,
-			.flags = IOMMU_FAULT_UNRECOV_ADDR_VALID,
 			.perm = perm,
 			.addr = FIELD_GET(EVTQ_2_ADDR, evt[2]),
 		};
@@ -1550,6 +1549,43 @@ static int arm_smmu_handle_evt(struct arm_smmu_device *smmu, u64 *evt)
 			flt->event.flags |= IOMMU_FAULT_UNRECOV_PASID_VALID;
 			flt->event.pasid = FIELD_GET(EVTQ_0_SSID, evt[0]);
 		}
+
+		switch (type) {
+		case EVT_ID_TRANSLATION_FAULT:
+			flt->event.reason = IOMMU_FAULT_REASON_PTE_FETCH;
+			flt->event.flags |= IOMMU_FAULT_UNRECOV_ADDR_VALID;
+			break;
+		case EVT_ID_ADDR_SIZE_FAULT:
+			flt->event.reason = IOMMU_FAULT_REASON_OOR_ADDRESS;
+			flt->event.flags |= IOMMU_FAULT_UNRECOV_ADDR_VALID;
+			break;
+		case EVT_ID_ACCESS_FAULT:
+			flt->event.reason = IOMMU_FAULT_REASON_ACCESS;
+			flt->event.flags |= IOMMU_FAULT_UNRECOV_ADDR_VALID;
+			break;
+		case EVT_ID_PERMISSION_FAULT:
+			flt->event.reason = IOMMU_FAULT_REASON_PERMISSION;
+			flt->event.flags |= IOMMU_FAULT_UNRECOV_ADDR_VALID;
+			break;
+		case EVT_ID_BAD_SUBSTREAMID:
+			flt->event.reason = IOMMU_FAULT_REASON_PASID_INVALID;
+			break;
+		case EVT_ID_CD_FETCH:
+			flt->event.reason = IOMMU_FAULT_REASON_PASID_FETCH;
+			flt->event.flags |= IOMMU_FAULT_UNRECOV_FETCH_ADDR_VALID;
+			break;
+		case EVT_ID_BAD_CD:
+			flt->event.reason = IOMMU_FAULT_REASON_BAD_PASID_ENTRY;
+			break;
+		case EVT_ID_WALK_EABT:
+			flt->event.reason = IOMMU_FAULT_REASON_WALK_EABT;
+			flt->event.flags |= IOMMU_FAULT_UNRECOV_ADDR_VALID |
+					    IOMMU_FAULT_UNRECOV_FETCH_ADDR_VALID;
+			break;
+		default:
+			/* TODO: report other unrecoverable faults. */
+			return -EFAULT;
+		}
 	}
 
 	mutex_lock(&smmu->streams_mutex);
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 05959df01618..b914570ee5ba 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -379,6 +379,10 @@
 
 #define EVTQ_0_ID			GENMASK_ULL(7, 0)
 
+#define EVT_ID_BAD_SUBSTREAMID		0x08
+#define EVT_ID_CD_FETCH			0x09
+#define EVT_ID_BAD_CD			0x0a
+#define EVT_ID_WALK_EABT		0x0b
 #define EVT_ID_TRANSLATION_FAULT	0x10
 #define EVT_ID_ADDR_SIZE_FAULT		0x11
 #define EVT_ID_ACCESS_FAULT		0x12
-- 
2.26.3