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From:   Ioana Ciornei <ioana.ciornei@nxp.com>
To:     Jeremy Linton <jeremy.linton@arm.com>
CC:     Hamza Mahfooz <someguy@effective-light.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Robin Murphy <robin.murphy@arm.com>,
        "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
        Dan Williams <dan.j.williams@intel.com>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: DPAA2 triggers, [PATCH] dma debug: report -EEXIST errors in
 add_dma_entry
Thread-Topic: DPAA2 triggers, [PATCH] dma debug: report -EEXIST errors in
 add_dma_entry
Thread-Index: AQHXpSuO4AOhY9kToEi8I4sPqFaslaucNY2A
Date:   Thu, 9 Sep 2021 21:16:26 +0000
Message-ID: <20210909211625.zwnbmwzqa5qqulrq@skbuf>
References: <20210518125443.34148-1-someguy@effective-light.com>
 <fd67fbac-64bf-f0ea-01e1-5938ccfab9d0@arm.com>
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On Wed, Sep 08, 2021 at 10:33:26PM -0500, Jeremy Linton wrote:
> +DPAA2, netdev maintainers
> Hi,
>=20
> On 5/18/21 7:54 AM, Hamza Mahfooz wrote:
> > Since, overlapping mappings are not supported by the DMA API we should
> > report an error if active_cacheline_insert returns -EEXIST.
>=20
> It seems this patch found a victim. I was trying to run iperf3 on a
> honeycomb (5.14.0, fedora 35) and the console is blasting this error mess=
age
> at 100% cpu. So, I changed it to a WARN_ONCE() to get the call trace, whi=
ch
> is attached below.
>=20

Thanks for the report.

I don't have access to hardware at the moment to actually see what's
happening since I'm on vacation.  I'll work on it in a few days.

Ioana=