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

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Date:   Fri, 9 Nov 2018 08:49:55 +0100
From:   Christoph Hellwig <hch@....de>
To:     John Stultz <john.stultz@...aro.org>
Cc:     hch@....de, Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        robin.murphy@....com, konrad.wilk@...cle.com,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        iommu@...ts.linux-foundation.org,
        Linux Kernel Mailing List <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

On Tue, Nov 06, 2018 at 05:27:14PM -0800, John Stultz wrote:
> But at that point if I just re-apply "swiotlb: use swiotlb_map_page in
> swiotlb_map_sg_attrs", I reproduce the hangs.
> 
> Any suggestions for how to further debug what might be going wrong
> would be appreciated!

Very odd.  In the end map_sg and map_page are defined to do the same
things to start with.  The only real issue we had in this area was:

"[PATCH v2] of/device: Really only set bus DMA mask when appropriate"

so with current mainline + that you still see a problem, and if you
rever the commit we are replying to it still goes away?