# \[PATCH 1/2\] arm64: dma\_mapping: allow PCI host driver to limit DMA mask

- From: Sergei Shtylyov \<hidden\>
- Date: 2016-12-30 10:07:04 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2016/12/4901853
- Thread: https://ratatoskr.run/linux-arm-kernel/2016/12/4901675/t.md

```text
On 12/30/2016 12:46 PM, Sergei Shtylyov wrote:

>> It is possible that PCI device supports 64-bit DMA addressing, and thus
>> it's driver sets device's dma_mask to DMA_BIT_MASK(64), however PCI host
>
>    Its.
>
>> bridge has limitations on inbound transactions addressing. Example of
>> such setup is NVME
>
>    Isn't it called NVMe?
>
>> SSD device connected to RCAR PCIe controller.
>
>    R=Car.

    Sorry, R-Car. :-)

[...]

MBR, Sergei
```