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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Apr 13, 2016 at 02:18:09PM +0900, Wonseok Ko wrote:
> 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.

Are there any errors? What does dma_mask end up being?
> 2. forced set dev->dma_mask without kernel api. I passed to dma_capable()
> but driver cannot work.

Aha, what did you set it to? Do you have a diff?
> 
> sh_eth driver want to get valid DMA descriptor to set DMA descriptor
> address for Rx and Tx.

Right, which it would plug in its driver registers so the card
can pick it up.
> I tried to set the some bits(such as dma_mask) to get valid dma address
> forcibly, in this configuration sh_eth cannot work.

Uh, not sure I understand. Or are you repeating what you mentioned
earlier?
> 
> My question is if I want to get valid dma address with xen swiotlb(suchas
> map_page, set_dma_mask and so on)?

Well it all should work just fine - perhaps if you provide some
diff's and such I can help you along?

> 
> 
> 
> 
> 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.
> >
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@xxxxxxxxxxxxx
> > > http://lists.xen.org/xen-devel
> >
> >

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