[v4,08/14] iommufd/viommu: Add iommufd_viommu_report_event helper

Commit Message

Nicolin Chen Jan. 3, 2025, 7:43 p.m. UTC

Similar to iommu_report_device_fault, this allows IOMMU drivers to report
vIOMMU events from threaded IRQ handlers to user space hypervisors.

Signed-off-by: Nicolin Chen <[e-mail]>
---
 include/linux/iommufd.h        | 11 ++++++++++
 drivers/iommu/iommufd/driver.c | 40 ++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

Comments

Baolu Lu Jan. 6, 2025, 2:51 a.m. UTC | #1

On 1/4/25 03:43, Nicolin Chen wrote:
> Similar to iommu_report_device_fault, this allows IOMMU drivers to report
> vIOMMU events from threaded IRQ handlers to user space hypervisors.
> 
> Signed-off-by: Nicolin Chen<[e-mail]>
> ---
>   include/linux/iommufd.h        | 11 ++++++++++
>   drivers/iommu/iommufd/driver.c | 40 ++++++++++++++++++++++++++++++++++
>   2 files changed, 51 insertions(+)

Reviewed-by: Lu Baolu <[e-mail]>

Patch

diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 9c6ba7df3994..6b3b46e382f8 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -11,6 +11,7 @@ 
 #include <linux/refcount.h>
 #include <linux/types.h>
 #include <linux/xarray.h>
+#include <uapi/linux/iommufd.h>
 
 struct device;
 struct file;
@@ -192,6 +193,9 @@  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_event(struct iommufd_viommu *viommu,
+				enum iommu_veventq_type type, void *event_data,
+				size_t data_len);
 #else /* !CONFIG_IOMMUFD_DRIVER_CORE */
 static inline struct iommufd_object *
 _iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size,
@@ -211,6 +215,13 @@  iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, struct device *dev)
 {
 	return 0;
 }
+
+static inline int iommufd_viommu_report_event(struct iommufd_viommu *viommu,
+					      enum iommu_veventq_type type,
+					      void *event_data, size_t data_len)
+{
+	return -EOPNOTSUPP;
+}
 #endif /* CONFIG_IOMMUFD_DRIVER_CORE */
 
 /*
diff --git a/drivers/iommu/iommufd/driver.c b/drivers/iommu/iommufd/driver.c
index e5d7397c0a6c..77c34f8791ef 100644
--- a/drivers/iommu/iommufd/driver.c
+++ b/drivers/iommu/iommufd/driver.c
@@ -69,5 +69,45 @@  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.
+ * The @type and @event_data must be defined in include/uapi/linux/iommufd.h
+ */
+int iommufd_viommu_report_event(struct iommufd_viommu *viommu,
+				enum iommu_veventq_type type, void *event_data,
+				size_t data_len)
+{
+	struct iommufd_veventq *veventq;
+	struct iommufd_vevent *vevent;
+	int rc = 0;
+
+	if (!viommu)
+		return -ENODEV;
+	if (WARN_ON_ONCE(!data_len || !event_data))
+		return -EINVAL;
+
+	down_read(&viommu->veventqs_rwsem);
+
+	veventq = iommufd_viommu_find_veventq(viommu, type);
+	if (!veventq) {
+		rc = -EOPNOTSUPP;
+		goto out_unlock_veventqs;
+	}
+
+	vevent = kmalloc(struct_size(vevent, event_data, data_len), GFP_KERNEL);
+	if (!vevent) {
+		rc = -ENOMEM;
+		goto out_unlock_veventqs;
+	}
+	memcpy(vevent->event_data, event_data, data_len);
+	vevent->data_len = data_len;
+
+	iommufd_vevent_handler(veventq, vevent);
+out_unlock_veventqs:
+	up_read(&viommu->veventqs_rwsem);
+	return rc;
+}
+EXPORT_SYMBOL_NS_GPL(iommufd_viommu_report_event, "IOMMUFD");
+
 MODULE_DESCRIPTION("iommufd code shared with builtin modules");
 MODULE_LICENSE("GPL");