[PATCH v5 01/25] iommu: Add iommu_ops->identity_domain

[Baolu Lu]

On 2023/7/25 1:21, 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.
> 
> 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>
> Signed-off-by: Jason Gunthorpe<jgg at nvidia.com>
> ---
>   drivers/iommu/iommu.c          | 3 +++
>   drivers/iommu/rockchip-iommu.c | 9 +--------
>   include/linux/iommu.h          | 3 +++
>   3 files changed, 7 insertions(+), 8 deletions(-)

I will later convert the VT-d driver to use iommu_ops->identity_domain.

Reviewed-by: Lu Baolu <baolu.lu at linux.intel.com>