Re: [PATCH v3 3/7] iommu/sva: Support allocation of global PASIDs outside SVA

[Baolu Lu]

On 2023/4/1 7:11, Jacob Pan wrote:
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 54f535ff9868..f70478a11a5f 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -1187,6 +1187,9 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev,
>   					struct mm_struct *mm);
>   void iommu_sva_unbind_device(struct iommu_sva *handle);
>   u32 iommu_sva_get_pasid(struct iommu_sva *handle);
> +ioasid_t iommu_alloc_global_pasid(ioasid_t min, ioasid_t max);
> +void iommu_free_global_pasid(ioasid_t pasid);
> +
>   #else
>   static inline struct iommu_sva *
>   iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
> @@ -1202,6 +1205,13 @@ static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
>   {
>   	return IOMMU_PASID_INVALID;
>   }
> +
> +static inline ioasid_t iommu_alloc_global_pasid(ioasid_t min, ioasid_t max)
> +{
> +	return IOMMU_PASID_INVALID;
> +}
> +
> +static inline void iommu_free_global_pasid(ioasid_t pasid) {}
>   static inline void mm_pasid_init(struct mm_struct *mm) {}
>   static inline void mm_pasid_drop(struct mm_struct *mm) {}
>   #endif /* CONFIG_IOMMU_SVA */

I don't think the function prototypes of
iommu_[alloc|free]_global_pasid() should be impacted by
CONFIG_IOMMU_SVA. Or I may overlooked something?

Best regards,
baolu