[RFC v3 17/21] iommu/smmuv3: Report non recoverable faults

Eric Auger
2019-01-08T10:28:44Z

When a stage 1 related fault event is read from the event queue,
let's propagate it to potential external fault listeners, ie. users
who registered a fault handler.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
drivers/iommu/arm-smmu-v3.c | 124 ++++++++++++++++++++++++++++++++----
1 file changed, 113 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 999ee470a2ae..6a711cbbb228 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -168,6 +168,26 @@
#define ARM_SMMU_PRIQ_IRQ_CFG1 0xd8
#define ARM_SMMU_PRIQ_IRQ_CFG2 0xdc

+/* Events */
+#define ARM_SMMU_EVT_F_UUT 0x01
+#define ARM_SMMU_EVT_C_BAD_STREAMID 0x02
+#define ARM_SMMU_EVT_F_STE_FETCH 0x03
+#define ARM_SMMU_EVT_C_BAD_STE 0x04
+#define ARM_SMMU_EVT_F_BAD_ATS_TREQ 0x05
+#define ARM_SMMU_EVT_F_STREAM_DISABLED 0x06
+#define ARM_SMMU_EVT_F_TRANSL_FORBIDDEN 0x07
+#define ARM_SMMU_EVT_C_BAD_SUBSTREAMID 0x08
+#define ARM_SMMU_EVT_F_CD_FETCH 0x09
+#define ARM_SMMU_EVT_C_BAD_CD 0x0a
+#define ARM_SMMU_EVT_F_WALK_EABT 0x0b
+#define ARM_SMMU_EVT_F_TRANSLATION 0x10
+#define ARM_SMMU_EVT_F_ADDR_SIZE 0x11
+#define ARM_SMMU_EVT_F_ACCESS 0x12
+#define ARM_SMMU_EVT_F_PERMISSION 0x13
+#define ARM_SMMU_EVT_F_TLB_CONFLICT 0x20
+#define ARM_SMMU_EVT_F_CFG_CONFLICT 0x21
+#define ARM_SMMU_EVT_E_PAGE_REQUEST 0x24
+
/* Common MSI config fields */
#define MSI_CFG0_ADDR_MASK GENMASK_ULL(51, 2)
#define MSI_CFG2_SH GENMASK(5, 4)
@@ -333,6 +353,11 @@
#define EVTQ_MAX_SZ_SHIFT 7

#define EVTQ_0_ID GENMASK_ULL(7, 0)
+#define EVTQ_0_SUBSTREAMID GENMASK_ULL(31, 12)
+#define EVTQ_0_STREAMID GENMASK_ULL(63, 32)
+#define EVTQ_1_S2 GENMASK_ULL(39, 39)
+#define EVTQ_1_CLASS GENMASK_ULL(40, 41)
+#define EVTQ_3_FETCH_ADDR GENMASK_ULL(51, 3)

/* PRI queue */
#define PRIQ_ENT_DWORDS 2
@@ -1270,7 +1295,6 @@ static int arm_smmu_init_l2_strtab(struct arm_smmu_device *smmu, u32 sid)
return 0;
}

-__maybe_unused
static struct arm_smmu_master_data *
arm_smmu_find_master(struct arm_smmu_device *smmu, u32 sid)
{
@@ -1296,24 +1320,102 @@ arm_smmu_find_master(struct arm_smmu_device *smmu, u32 sid)
return master;
}

+static void arm_smmu_report_event(struct arm_smmu_device *smmu, u64 *evt)
+{
+ u64 fetch_addr = FIELD_GET(EVTQ_3_FETCH_ADDR, evt[3]);
+ u32 sid = FIELD_GET(EVTQ_0_STREAMID, evt[0]);
+ bool s1 = !FIELD_GET(EVTQ_1_S2, evt[1]);
+ u8 type = FIELD_GET(EVTQ_0_ID, evt[0]);
+ struct arm_smmu_master_data *master;
+ struct iommu_fault_event event;
+ bool propagate = true;
+ u64 addr = evt[2];
+ int i;
+
+ master = arm_smmu_find_master(smmu, sid);
+ if (WARN_ON(!master))
+ return;
+
+ event.fault.type = IOMMU_FAULT_DMA_UNRECOV;
+
+ switch (type) {
+ case ARM_SMMU_EVT_C_BAD_STREAMID:
+ event.fault.reason = IOMMU_FAULT_REASON_SOURCEID_INVALID;
+ break;
+ case ARM_SMMU_EVT_F_STREAM_DISABLED:
+ case ARM_SMMU_EVT_C_BAD_SUBSTREAMID:
+ event.fault.reason = IOMMU_FAULT_REASON_PASID_INVALID;
+ break;
+ case ARM_SMMU_EVT_F_CD_FETCH:
+ event.fault.reason = IOMMU_FAULT_REASON_PASID_FETCH;
+ break;
+ case ARM_SMMU_EVT_F_WALK_EABT:
+ event.fault.reason = IOMMU_FAULT_REASON_WALK_EABT;
+ event.fault.addr = addr;
+ event.fault.fetch_addr = fetch_addr;
+ propagate = s1;
+ break;
+ case ARM_SMMU_EVT_F_TRANSLATION:
+ event.fault.reason = IOMMU_FAULT_REASON_PTE_FETCH;
+ event.fault.addr = addr;
+ event.fault.fetch_addr = fetch_addr;
+ propagate = s1;
+ break;
+ case ARM_SMMU_EVT_F_PERMISSION:
+ event.fault.reason = IOMMU_FAULT_REASON_PERMISSION;
+ event.fault.addr = addr;
+ propagate = s1;
+ break;
+ case ARM_SMMU_EVT_F_ACCESS:
+ event.fault.reason = IOMMU_FAULT_REASON_ACCESS;
+ event.fault.addr = addr;
+ propagate = s1;
+ break;
+ case ARM_SMMU_EVT_C_BAD_STE:
+ event.fault.reason = IOMMU_FAULT_REASON_BAD_DEVICE_CONTEXT_ENTRY;
+ break;
+ case ARM_SMMU_EVT_C_BAD_CD:
+ event.fault.reason = IOMMU_FAULT_REASON_BAD_PASID_ENTRY;
+ break;
+ case ARM_SMMU_EVT_F_ADDR_SIZE:
+ event.fault.reason = IOMMU_FAULT_REASON_OOR_ADDRESS;
+ propagate = s1;
+ break;
+ case ARM_SMMU_EVT_F_STE_FETCH:
+ event.fault.reason = IOMMU_FAULT_REASON_DEVICE_CONTEXT_FETCH;
+ event.fault.fetch_addr = fetch_addr;
+ break;
+ /* End of addition */
+ case ARM_SMMU_EVT_E_PAGE_REQUEST:
+ case ARM_SMMU_EVT_F_TLB_CONFLICT:
+ case ARM_SMMU_EVT_F_CFG_CONFLICT:
+ case ARM_SMMU_EVT_F_BAD_ATS_TREQ:
+ case ARM_SMMU_EVT_F_TRANSL_FORBIDDEN:
+ case ARM_SMMU_EVT_F_UUT:
+ default:
+ event.fault.reason = IOMMU_FAULT_REASON_UNKNOWN;
+ }
+ /* only propagate the error if it relates to stage 1 */
+ if (s1)
+ iommu_report_device_fault(master->dev, &event);
+
+ dev_info(smmu->dev, "event 0x%02x received:\n", type);
+ for (i = 0; i < EVTQ_ENT_DWORDS; ++i) {
+ dev_info(smmu->dev, "\t0x%016llx\n",
+ (unsigned long long)evt[i]);
+ }
+}
+
/* IRQ and event handlers */
static irqreturn_t arm_smmu_evtq_thread(int irq, void *dev)
{
- int i;
struct arm_smmu_device *smmu = dev;
struct arm_smmu_queue *q = &smmu->evtq.q;
u64 evt[EVTQ_ENT_DWORDS];

do {
- while (!queue_remove_raw(q, evt)) {
- u8 id = FIELD_GET(EVTQ_0_ID, evt[0]);
-
- dev_info(smmu->dev, "event 0x%02x received:\n", id);
- for (i = 0; i < ARRAY_SIZE(evt); ++i)
- dev_info(smmu->dev, "\t0x%016llx\n",
- (unsigned long long)evt[i]);
-
- }
+ while (!queue_remove_raw(q, evt))
+ arm_smmu_report_event(smmu, evt);

/*
* Not much we can do on overflow, so scream and pretend we're
--
2.17.2