[PATCH v7 02/24] iommu: Add IOMMU_DOMAIN_PLATFORM

[Jerry Snitselaar]

On Fri, Aug 25, 2023 at 02:40:10PM -0300, Jason Gunthorpe wrote:
> On Thu, Aug 24, 2023 at 06:51:48PM -0700, Jerry Snitselaar wrote:
> 
> > > +	/*
> > > +	 * Allow legacy drivers to specify the domain that will be the default
> > > +	 * domain. This should always be either an IDENTITY or PLATFORM domain.
> > > +	 * Do not use in new drivers.
> > > +	 */
> > 
> > Would it be worthwhile to mention this in iommu.h for the iommu_ops default_domain?
> 
> I did this:
> 
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 11d47f9ac9b345..7fa53d28feca87 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -1757,8 +1757,8 @@ iommu_group_alloc_default_domain(struct iommu_group *group, int req_type)
>  
>         /*
>          * Allow legacy drivers to specify the domain that will be the default
> -        * domain. This should always be either an IDENTITY or PLATFORM domain.
> -        * Do not use in new drivers.
> +        * domain. This should always be either an IDENTITY/BLOCKED/PLATFORM
> +        * domain. Do not use in new drivers.
>          */
>         if (ops->default_domain) {
>                 if (req_type)
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 7e9d94a56f473e..6f9e0aacc4431a 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -267,6 +267,8 @@ struct iommu_iotlb_gather {
>   * @blocked_domain: An always available, always attachable blocking
>   *                  translation.
>   * @default_domain: If not NULL this will always be set as the default domain.
> + *                  This should be an IDENTITY/BLOCKED/PLATFORM domain.
> + *                  Do not use in new drivers.
>   */
>  struct iommu_ops {
>         bool (*capable)(struct device *dev, enum iommu_cap);
> 
> Thanks,
> Jason
> 

For all of 02/24

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

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