3 files changed, 33 insertions, 1 deletions
diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
index e98f20a9bdd8..e7ee2577f98d 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -15,6 +15,7 @@ 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(struct amd_iommu *iommu, u16 devid);
 extern void amd_iommu_restart_event_logging(struct amd_iommu *iommu);
+extern void amd_iommu_restart_ga_log(struct amd_iommu *iommu);
 extern int amd_iommu_init_devices(void);
 extern void amd_iommu_uninit_devices(void);
 extern void amd_iommu_init_notifier(void);
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 329a406cc37d..c2d80a4e5fb0 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -759,6 +759,30 @@ void amd_iommu_restart_event_logging(struct amd_iommu *iommu)
 }
 
 /*
+ * This function restarts event logging in case the IOMMU experienced
+ * an GA log overflow.
+ */
+void amd_iommu_restart_ga_log(struct amd_iommu *iommu)
+{
+	u32 status;
+
+	status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
+	if (status & MMIO_STATUS_GALOG_RUN_MASK)
+		return;
+
+	pr_info_ratelimited("IOMMU GA Log restarting\n");
+
+	iommu_feature_disable(iommu, CONTROL_GALOG_EN);
+	iommu_feature_disable(iommu, CONTROL_GAINT_EN);
+
+	writel(MMIO_STATUS_GALOG_OVERFLOW_MASK,
+	       iommu->mmio_base + MMIO_STATUS_OFFSET);
+
+	iommu_feature_enable(iommu, CONTROL_GAINT_EN);
+	iommu_feature_enable(iommu, CONTROL_GALOG_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 72845541ef2e..8c08d8273326 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -845,6 +845,7 @@ amd_iommu_set_pci_msi_domain(struct device *dev, struct amd_iommu *iommu) { }
 	(MMIO_STATUS_EVT_OVERFLOW_INT_MASK | \
 	 MMIO_STATUS_EVT_INT_MASK | \
 	 MMIO_STATUS_PPR_INT_MASK | \
+	 MMIO_STATUS_GALOG_OVERFLOW_MASK | \
 	 MMIO_STATUS_GALOG_INT_MASK)
 
 irqreturn_t amd_iommu_int_thread(int irq, void *data)
@@ -868,10 +869,16 @@ irqreturn_t amd_iommu_int_thread(int irq, void *data)
 		}
 
 #ifdef CONFIG_IRQ_REMAP
-		if (status & MMIO_STATUS_GALOG_INT_MASK) {
+		if (status & (MMIO_STATUS_GALOG_INT_MASK |
+			      MMIO_STATUS_GALOG_OVERFLOW_MASK)) {
 			pr_devel("Processing IOMMU GA Log\n");
 			iommu_poll_ga_log(iommu);
 		}
+
+		if (status & MMIO_STATUS_GALOG_OVERFLOW_MASK) {
+			pr_info_ratelimited("IOMMU GA Log overflow\n");
+			amd_iommu_restart_ga_log(iommu);
+		}
 #endif
 
 		if (status & MMIO_STATUS_EVT_OVERFLOW_INT_MASK) {