Similar to iommu_report_device_fault, this allows IOMMU drivers to report,
from threaded IRQ handlers to user space hypervisors, IRQs or events that
belong to a vIOMMU.
Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
include/linux/iommufd.h | 9 ++++++++
drivers/iommu/iommufd/driver.c | 41 ++++++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+)
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 1f5376476cfa..2ce78edec4e9 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -192,6 +192,8 @@ struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu,
unsigned long vdev_id);
unsigned long iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu,
struct device *dev);
+int iommufd_viommu_report_irq(struct iommufd_viommu *viommu, unsigned int type,
+ void *irq_ptr, size_t irq_len);
#else /* !CONFIG_IOMMUFD_DRIVER_CORE */
static inline struct iommufd_object *
_iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size,
@@ -211,6 +213,13 @@ iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, struct device *dev)
{
return 0;
}
+
+static inline int iommufd_viommu_report_irq(struct iommufd_viommu *viommu,
+ unsigned int type, void *irq_ptr,
+ size_t irq_len)
+{
+ return -EOPNOTSUPP;
+}
#endif /* CONFIG_IOMMUFD_DRIVER_CORE */
/*
diff --git a/drivers/iommu/iommufd/driver.c b/drivers/iommu/iommufd/driver.c
index 817e430a11bc..339baa270d1e 100644
--- a/drivers/iommu/iommufd/driver.c
+++ b/drivers/iommu/iommufd/driver.c
@@ -67,5 +67,46 @@ unsigned long iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu,
}
EXPORT_SYMBOL_NS_GPL(iommufd_viommu_get_vdev_id, IOMMUFD);
+/* Typically called in driver's threaded IRQ handler */
+int iommufd_viommu_report_irq(struct iommufd_viommu *viommu, unsigned int type,
+ void *irq_ptr, size_t irq_len)
+{
+ struct iommufd_eventq_virq *eventq_virq;
+ struct iommufd_virq *virq;
+ int rc = 0;
+
+ might_sleep();
+
+ if (!viommu)
+ return -ENODEV;
+ if (WARN_ON_ONCE(!irq_len || !irq_ptr))
+ return -EINVAL;
+
+ down_read(&viommu->virqs_rwsem);
+
+ eventq_virq = iommufd_viommu_find_eventq_virq(viommu, type);
+ if (!eventq_virq) {
+ rc = -EOPNOTSUPP;
+ goto out_unlock_vdev_ids;
+ }
+
+ virq = kzalloc(sizeof(*virq) + irq_len, GFP_KERNEL);
+ if (!virq) {
+ rc = -ENOMEM;
+ goto out_unlock_vdev_ids;
+ }
+ virq->irq_data = (void *)virq + sizeof(*virq);
+ memcpy(virq->irq_data, irq_ptr, irq_len);
+
+ virq->eventq_virq = eventq_virq;
+ virq->irq_len = irq_len;
+
+ iommufd_eventq_virq_handler(virq);
+out_unlock_vdev_ids:
+ up_read(&viommu->virqs_rwsem);
+ return rc;
+}
+EXPORT_SYMBOL_NS_GPL(iommufd_viommu_report_irq, IOMMUFD);
+
MODULE_DESCRIPTION("iommufd code shared with builtin modules");
MODULE_LICENSE("GPL");
--
2.43.0
