[PATCH v7 01/24] iommu: Add iommu_ops->identity_domain

[Jerry Snitselaar]

On Wed, Aug 23, 2023 at 01:47:15PM -0300, Jason Gunthorpe wrote:
> This allows a driver to set a global static to an IDENTITY domain and
> the core code will automatically use it whenever an IDENTITY domain
> is requested.
> 
> By making it always available it means the IDENTITY can be used in error
> handling paths to force the iommu driver into a known state. Devices
> implementing global static identity domains should avoid failing their
> attach_dev ops.
> 
> To make global static domains simpler allow drivers to omit their free
> function and update the iommufd selftest.
> 
> Convert rockchip to use the new mechanism.
> 
> Tested-by: Steven Price <steven.price at arm.com>
> Tested-by: Marek Szyprowski <m.szyprowski at samsung.com>
> Tested-by: Nicolin Chen <nicolinc at nvidia.com>
> Reviewed-by: Lu Baolu <baolu.lu at linux.intel.com>
> Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>


Reviewed-by: Jerry Snitselaar <jsnitsel at redhat.com>