[PATCH 3/4] dma-mapping: add a dma_ops_bypass flag to struct device

[Greg Kroah-Hartman]

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 at lst.de>
> ---
>  include/linux/device.h |  6 ++++
>  kernel/dma/mapping.c   | 70 +++++++++++++++++++++++++++++-------------
>  2 files changed, 55 insertions(+), 21 deletions(-)

Reviewed-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>