[PATCH v2 3/8] iommupt: Add PT_FEAT_DETAILED_GATHER

[Pranjal Shrivastava]

On Fri, May 08, 2026 at 11:53:02AM -0300, Jason Gunthorpe wrote:
> Generating the ARM SMMUv3 and RISC-V invalidation commands optimally
> requires some additional details from iommupt:
> 
> - leaf_levels_bitmap is used to compute the ARM Range Invalidation
>   Table Top Level hint
> 
> - leaf_levels_bitmap is also used to compute the stride when
>   generating single invalidations to invalidate once per leaf
> 
> - table_levels_bitmap also computes the ARM TTL for future cases when
>   there are no leaves
> 
> Put these under a feature since only two drivers need to calculate
> them.
> 
> This is also useful for the coming kunit iotlb invalidation test to
> know more about what invalidation is happening.
> 
> Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
> ---

The conditional gathering via PT_FEAT_DETAILED_GATHER looks nice.

Reviewed-by: Pranjal Shrivastava <praan at google.com>

Thanks,
Praan