linux-kernel - Re: [PATCH v15 06/12] swiotlb: Use is_swiotlb_force

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Message-ID: <YNvMDFWKXSm4LRfZ@Ryzen-9-3900X.localdomain>
Date:   Tue, 29 Jun 2021 18:43:21 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Claire Chang <tientzu@...omium.org>
Cc:     Rob Herring <robh+dt@...nel.org>, mpe@...erman.id.au,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
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        boris.ostrovsky@...cle.com, jgross@...e.com,
        Christoph Hellwig <hch@....de>,
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        benh@...nel.crashing.org, paulus@...ba.org,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        sstabellini@...nel.org, Robin Murphy <robin.murphy@....com>,
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Subject: Re: [PATCH v15 06/12] swiotlb: Use is_swiotlb_force_bounce for
 swiotlb data bouncing

On Thu, Jun 24, 2021 at 11:55:20PM +0800, Claire Chang wrote:
> Propagate the swiotlb_force into io_tlb_default_mem->force_bounce and
> use it to determine whether to bounce the data or not. This will be
> useful later to allow for different pools.
> 
> Signed-off-by: Claire Chang <tientzu@...omium.org>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Tested-by: Stefano Stabellini <sstabellini@...nel.org>
> Tested-by: Will Deacon <will@...nel.org>
> Acked-by: Stefano Stabellini <sstabellini@...nel.org>

This patch as commit af452ec1b1a3 ("swiotlb: Use is_swiotlb_force_bounce
for swiotlb data bouncing") causes my Ryzen 3 4300G system to fail to
get to an X session consistently (although not every single time),
presumably due to a crash in the AMDGPU driver that I see in dmesg.

I have attached logs at af452ec1b1a3 and f127c9556a8e and I am happy
to provide any further information, debug, or test patches as necessary.

Cheers,
Nathan

View attachment "af452ec1b1a3.log" of type "text/plain" (115266 bytes)

View attachment "f127c9556a8e.log" of type "text/plain" (111605 bytes)