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 | 37 ++++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+)
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index ac1f1897d290..c5909125775a 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 e5d7397c0a6c..2ab793f27f72 100644
--- a/drivers/iommu/iommufd/driver.c
+++ b/drivers/iommu/iommufd/driver.c
@@ -69,5 +69,42 @@ 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_virq_header *header;
+ struct iommufd_virq *virq;
+ int rc = 0;
+
+ if (!viommu)
+ return -ENODEV;
+ if (WARN_ON_ONCE(!irq_len || !irq_ptr))
+ return -EINVAL;
+
+ down_read(&viommu->virqs_rwsem);
+
+ virq = iommufd_viommu_find_virq(viommu, type);
+ if (!virq) {
+ rc = -EOPNOTSUPP;
+ goto out_unlock_virqs;
+ }
+
+ header = kzalloc(sizeof(*header) + irq_len, GFP_KERNEL);
+ if (!header) {
+ rc = -ENOMEM;
+ goto out_unlock_virqs;
+ }
+ header->irq_data = (void *)header + sizeof(*header);
+ memcpy(header->irq_data, irq_ptr, irq_len);
+ header->irq_len = irq_len;
+
+ iommufd_virq_handler(virq, header);
+out_unlock_virqs:
+ 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
