linux-kernel - Re: [PATCH 06/10] swiotlb: use swiotlb_map_page in swiotlb_map_sg

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Date:   Mon, 26 Nov 2018 19:31:43 +0000
From:   Will Deacon <will.deacon@....com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Christoph Hellwig <hch@....de>, john.stultz@...aro.org,
        Catalin Marinas <catalin.marinas@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        iommu@...ts.linux-foundation.org,
        lkml <linux-kernel@...r.kernel.org>,
        Valentin Schneider <valentin.schneider@....com>
Subject: Re: [PATCH 06/10] swiotlb: use swiotlb_map_page in
 swiotlb_map_sg_attrs

Hi Robin,

On Fri, Nov 23, 2018 at 07:34:15PM +0000, Robin Murphy wrote:
> On 2018-11-23 6:27 pm, Will Deacon wrote:
> >On Tue, Nov 20, 2018 at 10:25:16AM +0100, Christoph Hellwig wrote:
> >>On Mon, Nov 19, 2018 at 03:22:13PM -0800, John Stultz wrote:
> >>>>+               sg->dma_address = dma_addr;
> >>>>                 sg_dma_len(sg) = sg->length;
> >>>>         }
> >>>
> >>>I know Robin has already replied with more detailed info, but just to
> >>>close the loop as I'm finally home, applying this patch didn't seem to
> >>>help with the IO hangs I'm seeing w/ HiKey960.
> >>
> >>If Robins observation is right this should fix the problem for you:
> >
> >Please could you give this diff a try and let us know whether the problem
> >persists with your board?
> 
> This is actually the exact same change that I ended up with in my fixes[1],
> which John has indeed confirmed.
> 
> (sorry, it's the thing I was telling you about the other day, but I
> neglected to include you on cc you when I sent the patches out the following
> morning)

Thanks, I missed that series. I'll forget all about this problem then!

Will