linux-kernel - Re: [PATCH 3/4] dma-mapping: add a dma_ops

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Message-ID: <20200414124712.GA720223@kroah.com>
Date:   Tue, 14 Apr 2020 14:47:12 +0200
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 3/4] dma-mapping: add a dma_ops_bypass flag to struct
 device

On Tue, Apr 14, 2020 at 02:25:05PM +0200, 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 ++++
>  kernel/dma/mapping.c   | 70 +++++++++++++++++++++++++++++-------------
>  2 files changed, 55 insertions(+), 21 deletions(-)

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