[kernel,v2,1/2] vfio/spapr: Use IOMMU pageshift rather than pagesize

The size is always equal to 1 page so let's use this. Later on this will
be used for other checks which use page shifts to check the granularity
of access.

This should cause no behavioral change.

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
 drivers/vfio/vfio_iommu_spapr_tce.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

On Tue, 26 Jun 2018 15:59:25 +1000
Alexey Kardashevskiy <aik@ozlabs.ru> wrote:

> The size is always equal to 1 page so let's use this. Later on this will
> be used for other checks which use page shifts to check the granularity
> of access.
> 
> This should cause no behavioral change.
> 
> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> ---
>  drivers/vfio/vfio_iommu_spapr_tce.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

I assume a v3+ will go in through the ppc tree since the bulk of the
series is there.  For this,

Acked-by: Alex Williamson <alex.williamson@redhat.com>

> diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
> index 759a5bd..2da5f05 100644
> --- a/drivers/vfio/vfio_iommu_spapr_tce.c
> +++ b/drivers/vfio/vfio_iommu_spapr_tce.c
> @@ -457,13 +457,13 @@ static void tce_iommu_unuse_page(struct tce_container *container,
>  }
>  
>  static int tce_iommu_prereg_ua_to_hpa(struct tce_container *container,
> -		unsigned long tce, unsigned long size,
> +		unsigned long tce, unsigned long shift,
>  		unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem)
>  {
>  	long ret = 0;
>  	struct mm_iommu_table_group_mem_t *mem;
>  
> -	mem = mm_iommu_lookup(container->mm, tce, size);
> +	mem = mm_iommu_lookup(container->mm, tce, 1ULL << shift);
>  	if (!mem)
>  		return -EINVAL;
>  
> @@ -487,7 +487,7 @@ static void tce_iommu_unuse_page_v2(struct tce_container *container,
>  	if (!pua)
>  		return;
>  
> -	ret = tce_iommu_prereg_ua_to_hpa(container, *pua, IOMMU_PAGE_SIZE(tbl),
> +	ret = tce_iommu_prereg_ua_to_hpa(container, *pua, tbl->it_page_shift,
>  			&hpa, &mem);
>  	if (ret)
>  		pr_debug("%s: tce %lx at #%lx was not cached, ret=%d\n",
> @@ -611,7 +611,7 @@ static long tce_iommu_build_v2(struct tce_container *container,
>  				entry + i);
>  
>  		ret = tce_iommu_prereg_ua_to_hpa(container,
> -				tce, IOMMU_PAGE_SIZE(tbl), &hpa, &mem);
> +				tce, tbl->it_page_shift, &hpa, &mem);
>  		if (ret)
>  			break;
>  

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