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author | Lu Baolu <baolu.lu@linux.intel.com> | 2020-12-09 04:44:44 +0300 |
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committer | Alex Williamson <alex.williamson@redhat.com> | 2020-12-11 00:47:56 +0300 |
commit | bdfae1c9a913930eae5ea506733aa7c285e12a06 (patch) | |
tree | 2a0bfeeca896f23944a8dc07f8d356aa4485d425 /COPYING | |
parent | bccce80bbd44ab50bbec761a51c6293c1ce47e34 (diff) | |
download | linux-bdfae1c9a913930eae5ea506733aa7c285e12a06.tar.xz |
vfio/type1: Add vfio_group_iommu_domain()
Add the API for getting the domain from a vfio group. This could be used
by the physical device drivers which rely on the vfio/mdev framework for
mediated device user level access. The typical use case like below:
unsigned int pasid;
struct vfio_group *vfio_group;
struct iommu_domain *iommu_domain;
struct device *dev = mdev_dev(mdev);
struct device *iommu_device = mdev_get_iommu_device(dev);
if (!iommu_device ||
!iommu_dev_feature_enabled(iommu_device, IOMMU_DEV_FEAT_AUX))
return -EINVAL;
vfio_group = vfio_group_get_external_user_from_dev(dev);
if (IS_ERR_OR_NULL(vfio_group))
return -EFAULT;
iommu_domain = vfio_group_iommu_domain(vfio_group);
if (IS_ERR_OR_NULL(iommu_domain)) {
vfio_group_put_external_user(vfio_group);
return -EFAULT;
}
pasid = iommu_aux_get_pasid(iommu_domain, iommu_device);
if (pasid < 0) {
vfio_group_put_external_user(vfio_group);
return -EFAULT;
}
/* Program device context with pasid value. */
...
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'COPYING')
0 files changed, 0 insertions, 0 deletions