linux-kernel - Re: [PATCH v9 12/13] swiotlb-xen: pass dev_addr to xen_dma_unmap_page and xen_dma_sync_single_for

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Message-ID: <20141120203020.GJ31889@laptop.dumpdata.com>
Date:	Thu, 20 Nov 2014 15:30:21 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	xen-devel@...ts.xensource.com, Ian.Campbell@...rix.com,
	david.vrabel@...rix.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, catalin.marinas@....com
Subject: Re: [PATCH v9 12/13] swiotlb-xen: pass dev_addr to
 xen_dma_unmap_page and xen_dma_sync_single_for_cpu

On Thu, Nov 20, 2014 at 10:47:51AM +0000, Stefano Stabellini wrote:
> On Thu, 20 Nov 2014, Stefano Stabellini wrote:
> > On Wed, 19 Nov 2014, Konrad Rzeszutek Wilk wrote:
> > > On Wed, Nov 12, 2014 at 11:40:53AM +0000, Stefano Stabellini wrote:
> > > > xen_dma_unmap_page and xen_dma_sync_single_for_cpu take a dma_addr_t
> > > > handle as argument, not a physical address.
> > > 
> > > Ouch. Should this also go on stable tree?
> > 
> > Good idea
> 
> Also can I take that as an Acked-by for this patch?

Yes.
> 
> 
> There is one last bit of common and x86 changes in this series:
> patch #7 adds a paramter to xen_dma_map_page, even though the x86
> implementation is empty:
> 
> http://marc.info/?l=xen-devel&m=141579253829808&w=2
> 
> is that OK for you?

Yes.
>  
>  
> > > > Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> > > > Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> > > > ---
> > > >  drivers/xen/swiotlb-xen.c |    6 +++---
> > > >  1 file changed, 3 insertions(+), 3 deletions(-)
> > > > 
> > > > diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> > > > index 3725ee4..498b654 100644
> > > > --- a/drivers/xen/swiotlb-xen.c
> > > > +++ b/drivers/xen/swiotlb-xen.c
> > > > @@ -449,7 +449,7 @@ static void xen_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
> > > >  
> > > >  	BUG_ON(dir == DMA_NONE);
> > > >  
> > > > -	xen_dma_unmap_page(hwdev, paddr, size, dir, attrs);
> > > > +	xen_dma_unmap_page(hwdev, dev_addr, size, dir, attrs);
> > > >  
> > > >  	/* NOTE: We use dev_addr here, not paddr! */
> > > >  	if (is_xen_swiotlb_buffer(dev_addr)) {
> > > > @@ -497,14 +497,14 @@ xen_swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
> > > >  	BUG_ON(dir == DMA_NONE);
> > > >  
> > > >  	if (target == SYNC_FOR_CPU)
> > > > -		xen_dma_sync_single_for_cpu(hwdev, paddr, size, dir);
> > > > +		xen_dma_sync_single_for_cpu(hwdev, dev_addr, size, dir);
> > > >  
> > > >  	/* NOTE: We use dev_addr here, not paddr! */
> > > >  	if (is_xen_swiotlb_buffer(dev_addr))
> > > >  		swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target);
> > > >  
> > > >  	if (target == SYNC_FOR_DEVICE)
> > > > -		xen_dma_sync_single_for_cpu(hwdev, paddr, size, dir);
> > > > +		xen_dma_sync_single_for_cpu(hwdev, dev_addr, size, dir);
> > > >  
> > > >  	if (dir != DMA_FROM_DEVICE)
> > > >  		return;
> > > > -- 
> > > > 1.7.10.4
> > > > 
> > > 
> > 
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