diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2025-04-08 13:35:48 -0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2025-04-28 13:14:57 +0200 |
| commit | 0d609a1450fab636c825c66344ab0ecfc1d3a98c (patch) | |
| tree | f91b21448f4d2f70874456ebd4289b9b2b246858 /include/linux/iommu.h | |
| parent | 0d76a6edae9eeae5364285296b69d73dacb152f3 (diff) | |
iommu: Add domain_alloc_identity()
virtio-iommu has a mode where the IDENTITY domain is actually a paging
domain with an identity mapping covering some of the system address
space manually created.
To support this add a new domain_alloc_identity() op that accepts
the struct device so that virtio can allocate and fully finalize a
paging domain to return.
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/2-v4-ff5fb6b03bd1+288-iommu_virtio_domains_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 8d9119b000fe..7b636b92ac7c 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -567,6 +567,9 @@ iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size, * @domain_alloc: allocate and return an iommu domain if success. Otherwise * NULL is returned. The domain is not fully initialized until * the caller iommu_domain_alloc() returns. + * @domain_alloc_identity: allocate an IDENTITY domain. Drivers should prefer to + * use identity_domain instead. This should only be used + * if dynamic logic is necessary. * @domain_alloc_paging_flags: Allocate an iommu domain corresponding to the * input parameters as defined in * include/uapi/linux/iommufd.h. The @user_data can be @@ -625,6 +628,7 @@ struct iommu_ops { /* Domain allocation and freeing by the iommu driver */ struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); + struct iommu_domain *(*domain_alloc_identity)(struct device *dev); struct iommu_domain *(*domain_alloc_paging_flags)( struct device *dev, u32 flags, const struct iommu_user_data *user_data); |