linux-kernel - Re: [PATCH v7 6/6] iommu/s390: Implement map_pages()/unmap

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Message-ID: <Y1bEaytSOAoVjtLq@nvidia.com>
Date:   Mon, 24 Oct 2022 13:59:23 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     iommu@...ts.linux.dev, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Gerd Bayer <gbayer@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>,
        linux-s390@...r.kernel.org, borntraeger@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 6/6] iommu/s390: Implement map_pages()/unmap_pages()
 instead of map()/unmap()

On Mon, Oct 17, 2022 at 02:45:58PM +0200, Niklas Schnelle wrote:
> While s390-iommu currently implements the map_page()/unmap_page()
> operations which only map/unmap a single page at a time the internal
> s390_iommu_update_trans() API already supports mapping/unmapping a range
> of pages at once. Take advantage of this by implementing the
> map_pages()/unmap_pages() operations instead thus allowing users of the
> IOMMU drivers to map multiple pages in a single call followed by
> a single I/O TLB flush if needed.
> 
> Reviewed-by: Matthew Rosato <mjrosato@...ux.ibm.com>
> Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> ---
>  drivers/iommu/s390-iommu.c | 48 +++++++++++++++++++++++++-------------
>  1 file changed, 32 insertions(+), 16 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason