The AMD IOMMU logs I/O page faults and such to a ring buffer in
system memory, and this ring buffer can overflow. The AMD IOMMU
spec has the following to say about the interrupt status bit that
signals this overflow condition:
EventOverflow: Event log overflow. RW1C. Reset 0b. 1 = IOMMU
event log overflow has occurred. This bit is set when a new
event is to be written to the event log and there is no usable
entry in the event log, causing the new event information to
be discarded. An interrupt is generated when EventOverflow = 1b
and MMIO Offset 0018h[EventIntEn] = 1b. No new event log
entries are written while this bit is set. Software Note: To
resume logging, clear EventOverflow (W1C), and write a 1 to
MMIO Offset 0018h[EventLogEn].
The AMD IOMMU driver doesn't currently implement this recovery
sequence, meaning that if a ring buffer overflow occurs, logging
of EVT/PPR/GA events will cease entirely.
This patch implements the spec-mandated reset sequence, with the
minor tweak that the hardware seems to want to have a 0 written to
MMIO Offset 0018h[EventLogEn] first, before writing an 1 into this
field, or the IOMMU won't actually resume logging events.
Signed-off-by: Lennert Buytenhek <buyt...@arista.com>
---
Tested on v5.15-rc4 on a Ryzen 3700X.
Changes for v2:
- Rate limit event log overflow messages.
drivers/iommu/amd/amd_iommu.h | 1 +
drivers/iommu/amd/amd_iommu_types.h | 1 +
drivers/iommu/amd/init.c | 10 ++++++++++
drivers/iommu/amd/iommu.c | 10 ++++++++--
4 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
index 416815a525d6..bb95edf74415 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -14,6 +14,7 @@
extern irqreturn_t amd_iommu_int_thread(int irq, void *data);
extern irqreturn_t amd_iommu_int_handler(int irq, void *data);
extern void amd_iommu_apply_erratum_63(u16 devid);
+extern void amd_iommu_restart_event_logging(struct amd_iommu *iommu);
extern void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu);
extern int amd_iommu_init_devices(void);
extern void amd_iommu_uninit_devices(void);
diff --git a/drivers/iommu/amd/amd_iommu_types.h
b/drivers/iommu/amd/amd_iommu_types.h
index 8dbe61e2b3c1..095076029f8d 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -110,6 +110,7 @@
#define PASID_MASK 0x0000ffff
/* MMIO status bits */
+#define MMIO_STATUS_EVT_OVERFLOW_INT_MASK (1 << 0)
#define MMIO_STATUS_EVT_INT_MASK (1 << 1)
#define MMIO_STATUS_COM_WAIT_INT_MASK (1 << 2)
#define MMIO_STATUS_PPR_INT_MASK (1 << 6)
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 2a822b229bd0..f1c5eb023bda 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -654,6 +654,16 @@ static int __init alloc_command_buffer(struct amd_iommu
*iommu)
return iommu->cmd_buf ? 0 : -ENOMEM;
}
+/*
+ * This function restarts event logging in case the IOMMU experienced
+ * an event log buffer overflow.
+ */
+void amd_iommu_restart_event_logging(struct amd_iommu *iommu)
+{
+ iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
+ iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
+}
+
/*
* This function resets the command buffer if the IOMMU stopped fetching
* commands from it.
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 1722bb161841..f46eb7397021 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -742,7 +742,8 @@ amd_iommu_set_pci_msi_domain(struct device *dev, struct
amd_iommu *iommu) { }
#endif /* !CONFIG_IRQ_REMAP */
#define AMD_IOMMU_INT_MASK \
- (MMIO_STATUS_EVT_INT_MASK | \
+ (MMIO_STATUS_EVT_OVERFLOW_INT_MASK | \
+ MMIO_STATUS_EVT_INT_MASK | \
MMIO_STATUS_PPR_INT_MASK | \
MMIO_STATUS_GALOG_INT_MASK)
@@ -752,7 +753,7 @@ irqreturn_t amd_iommu_int_thread(int irq, void *data)
u32 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
while (status & AMD_IOMMU_INT_MASK) {
- /* Enable EVT and PPR and GA interrupts again */
+ /* Enable interrupt sources again */
writel(AMD_IOMMU_INT_MASK,
iommu->mmio_base + MMIO_STATUS_OFFSET);
@@ -773,6 +774,11 @@ irqreturn_t amd_iommu_int_thread(int irq, void *data)
}
#endif
+ if (status & MMIO_STATUS_EVT_OVERFLOW_INT_MASK) {
+ pr_info_ratelimited("IOMMU event log overflow\n");
+ amd_iommu_restart_event_logging(iommu);
+ }
+
/*
* Hardware bug: ERBT1312
* When re-enabling interrupt (by writing 1
--
2.31.1
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