linux-kernel - Re: dma api errors with swiotlb

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Message-ID: <4e21951d-025a-2b3d-14c8-878c6f237525@shipmail.org>
Date:   Wed, 4 Sep 2019 14:54:26 +0200
From:   Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: dma api errors with swiotlb

On 9/4/19 2:17 PM, Christoph Hellwig wrote:
> A call to dma_max_mapping_size() to limit the maximum I/O size solves
> that problem.  With the latest kernel that should actually be done
> automatically by the SCSI midlayer for you.

Hmm, OK. I guess with a sufficient queue depth and many mappings waiting 
for DMA completion, the SWIOTLB may fill up anyway...

I'll see if I can come up with something.

Thanks,

Thomas