Commit e8e1ef9b authored by Nicolin Chen's avatar Nicolin Chen Committed by Jason Gunthorpe
Browse files

iommufd/viommu: Add iommufd_viommu_report_event helper 

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: default avatarLu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Signed-off-by: default avatarNicolin Chen <nicolinc@nvidia.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
parent ea94b211

drivers/iommu/iommufd/driver.c

+48 −0
Original line number Diff line number Diff line
@@ -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");

include/linux/iommufd.h

+11 −0
Original line number Diff line number Diff line
@@ -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 */



/*