Re: [RFC PATCH v6 1/5] iommu: add an exported function to get minimum page size for a domain

[Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>]

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On Thu, Jun 13, 2019 at 07:20:11PM +0900, Yoshihiro Shimoda wrote:
> This patch adds an exported function to get minimum page size for
> a domain. This patch also modifies similar codes on the iommu.c.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh-zM6kxYcvzFBBDgjK7y7TUQ@public.gmane.org>
> ---
>  drivers/iommu/iommu.c | 18 +++++++++++++++---
>  include/linux/iommu.h |  1 +
>  2 files changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 2a90638..7ed16af 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -280,6 +280,18 @@ iommu_insert_device_resv_regions(struct list_head *dev_resv_regions,
>  	return ret;
>  }
>  
> +/**
> + * iommu_get_minimum_page_size - get minimum page size for a domain
> + * @domain: the domain
> + *
> + * Allow iommu driver to get a minimum page size for a domain.
> + */
> +unsigned long iommu_get_minimum_page_size(struct iommu_domain *domain)
> +{
> +	return 1UL << __ffs(domain->pgsize_bitmap);
> +}
> +EXPORT_SYMBOL_GPL(iommu_get_minimum_page_size);

What about making this a 'static inline' in the iommu header file? I'd
think it is simple enough and would save us the EXPORT symbol.


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