linux-kernel - Re: [PATCH 1/2] dma-mapping: add a dma_ops

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Date:   Fri, 20 Mar 2020 16:02:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Christoph Hellwig <hch@....de>
Cc:     iommu@...ts.linux-foundation.org,
        Alexey Kardashevskiy <aik@...abs.ru>,
        linuxppc-dev@...ts.ozlabs.org, Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct
 device

On Fri, Mar 20, 2020 at 03:16:39PM +0100, Christoph Hellwig wrote:
> Several IOMMU drivers have a bypass mode where they can use a direct
> mapping if the devices DMA mask is large enough.  Add generic support
> to the core dma-mapping code to do that to switch those drivers to
> a common solution.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  include/linux/device.h      |  6 ++++++
>  include/linux/dma-mapping.h | 30 ++++++++++++++++++------------
>  kernel/dma/mapping.c        | 36 +++++++++++++++++++++++++++---------
>  3 files changed, 51 insertions(+), 21 deletions(-)

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>