iommu: Hide ops.domain_alloc behind CONFIG_FSL_PAMU

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fsl_pamu is the last user of domain_alloc(), and it is using it to create
something weird that doesn't really fit into the iommu subsystem
architecture. It is a not a paging domain since it doesn't have any
map/unmap ops. It may be some special kind of identity domain.

For now just leave it as is. Wrap it's definition in CONFIG_FSL_PAMU to
discourage any new drivers from attempting to use it.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/5-v4-ff5fb6b03bd1+288-iommu_virtio_domains_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Jason Gunthorpe 2025-04-08 13:35:51 -03:00 • committed by Joerg Roedel

parent a4672d0fe1

commit 21c03574df

2 changed files with 5 additions and 3 deletions

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2

drivers/iommu/iommu.c

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6

include/linux/iommu.h

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