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iommu: Make set_dev_pasid op support domain replacement

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The iommu core is going to support domain replacement for pasid, it needs
to make the set_dev_pasid op support replacing domain and keep the old
domain config in the failure case.

AMD iommu driver does not support domain replacement for pasid yet, so it
would fail the set_dev_pasid op to keep the old config if the input @old
is non-NULL. Till now, all the set_dev_pasid callbacks can handle the old
parameter and can keep the old config when failed, so update the kdoc of
set_dev_pasid op.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20241107122234.7424-14-yi.l.liu@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Yi Liu
2024-11-08 10:14:04 +08:00
committed by Joerg Roedel
parent e9f1f727e6
commit 980e3016eb
2 changed files with 5 additions and 1 deletions
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3
include/linux/iommu.h
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@@ -616,7 +616,8 @@ struct iommu_ops {
* * EBUSY - device is attached to a domain and cannot be changed
* * ENODEV - device specific errors, not able to be attached
* * <others> - treated as ENODEV by the caller. Use is discouraged
* @set_dev_pasid: set an iommu domain to a pasid of device
* @set_dev_pasid: set or replace an iommu domain to a pasid of device. The pasid of
* the device should be left in the old config in error case.
* @map_pages: map a physically contiguous set of pages of the same size to
* an iommu domain.
* @unmap_pages: unmap a number of pages of the same size from an iommu domain