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iommufd/viommu: Add iommufd_viommu_report_event helper

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

Link: https://patch.msgid.link/r/44be825042c8255e75d0151b338ffd8ba0e4920b.1741719725.git.nicolinc@nvidia.com
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Nicolin Chen 2025-03-11 12:44:25 -07:00 committed by Jason Gunthorpe
parent ea94b211c5
commit e8e1ef9b77
2 changed files with 59 additions and 0 deletions
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48
drivers/iommu/iommufd/driver.c
View File

@ -73,5 +73,53 @@ int 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 (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;
}
spin_lock(&veventq->common.lock);
if (veventq->num_events == veventq->depth) {
vevent = &veventq->lost_events_header;
goto out_set_header;
}
vevent = kmalloc(struct_size(vevent, event_data, data_len), GFP_ATOMIC);
if (!vevent) {
rc = -ENOMEM;
vevent = &veventq->lost_events_header;
goto out_set_header;
}
memcpy(vevent->event_data, event_data, data_len);
vevent->data_len = data_len;
veventq->num_events++;
out_set_header:
iommufd_vevent_handler(veventq, vevent);
spin_unlock(&veventq->common.lock);
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");

11
include/linux/iommufd.h
View File

@ -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);
int iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu,
struct device *dev, unsigned long *vdev_id);
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,
@ -212,6 +216,13 @@ static inline int iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu,
{
return -ENOENT;
}
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 */
/*