Re: [Xen-devel] [sh_eth.c] Problem in dma_map_single()

[Wonseok Ko <magicyaba@xxxxxxxxx>]

Hi Konrad,

In dma_capable(), it checks that mask, size and address of device. 

Currently, it dosen't pass to first condition code as below:

if (!dev->dma_mask)

                return 0;

It shows the device doesn't have dma_mask bit. So I tried to set the dma_mask bit in sh_eth.c

My approaches:

1. I tried to set a mask bit(dev->dma_mask) to use dma_coerce_mask_and_coherent() in sh_eth_drv_probe(), but it doesn't work.

2. forced set dev->dma_mask without kernel api. I passed to dma_capable() but driver cannot work.

sh_eth driver want to get valid DMA descriptor to set DMA descriptor address for Rx and Tx.

I tried to set the some bits(such as dma_mask) to get valid dma address forcibly, in this configuration sh_eth cannot work.

My question is if I want to get valid dma address with xen swiotlb(suchas map_page, set_dma_mask and so on)?

Thanks,

Wonseok.

2016-04-13 2:10 GMT+09:00 Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>:

On Tue, Apr 12, 2016 at 04:54:55PM +0900, Wonseok Ko wrote:
> Hi,
>
> I'm trying to enable ethernet driver in Domain0 for R-Car H2, but it
> doesn't work. The root cause of the problem is that driver cannot satisfy
> the condition of dma_capable(). I found the same problem in the mailing

So what can be done about making it dma_capable() ?

> list, but the problem is still remaining I guess. previous mail: (
> http://lists.xen.org/archives/html/xen-devel/2014-10/msg03170.html)
>
> Does anyone give me advise?
>
> My environment as below:
> - dom0 linux version: 4.3
> - xen version: 4.6 commit(40d7a7454835c2f7c639c78f6c09e7b6f0e4a4e2)
>
>
> Thanks,
> Wonseok.

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