Re: [PATCH v10 01/12] iommu: Add max_pasids field in struct iommu_device

[Jason Gunthorpe]

On Tue, Jul 05, 2022 at 01:06:59PM +0800, Lu Baolu wrote:
> Use this field to keep the number of supported PASIDs that an IOMMU
> hardware is able to support. This is a generic attribute of an IOMMU
> and lifting it into the per-IOMMU device structure makes it possible
> to allocate a PASID for device without calls into the IOMMU drivers.
> Any iommu driver that supports PASID related features should set this
> field before enabling them on the devices.
> 
> In the Intel IOMMU driver, intel_iommu_sm is moved to CONFIG_INTEL_IOMMU
> enclave so that the pasid_supported() helper could be used in dmar.c
> without compilation errors.
> 
> Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> Reviewed-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
> Tested-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
> Tested-by: Tony Zhu <tony.zhu@xxxxxxxxx>
> ---
>  include/linux/intel-iommu.h                 | 3 ++-
>  include/linux/iommu.h                       | 2 ++
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 1 +
>  drivers/iommu/intel/dmar.c                  | 7 +++++++
>  4 files changed, 12 insertions(+), 1 deletion(-)

Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Jason