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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
Date: Thu, 9 Sep 2021 21:16:26 +0000	[thread overview]
Message-ID: <20210909211625.zwnbmwzqa5qqulrq@skbuf> (raw)
In-Reply-To: <fd67fbac-64bf-f0ea-01e1-5938ccfab9d0@arm.com>

On Wed, Sep 08, 2021 at 10:33:26PM -0500, Jeremy Linton wrote:
> +DPAA2, netdev maintainers
> Hi,
> 
> 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.
> 
> 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 message
> at 100% cpu. So, I changed it to a WARN_ONCE() to get the call trace, which
> is attached below.
> 

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

WARNING: multiple messages have this Message-ID (diff)
From: Ioana Ciornei <ioana.ciornei@nxp.com>
To: Jeremy Linton <jeremy.linton@arm.com>
Cc: Hamza Mahfooz <someguy@effective-light.com>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: DPAA2 triggers, [PATCH] dma debug: report -EEXIST errors in add_dma_entry
Date: Thu, 9 Sep 2021 21:16:26 +0000	[thread overview]
Message-ID: <20210909211625.zwnbmwzqa5qqulrq@skbuf> (raw)
In-Reply-To: <fd67fbac-64bf-f0ea-01e1-5938ccfab9d0@arm.com>

On Wed, Sep 08, 2021 at 10:33:26PM -0500, Jeremy Linton wrote:
> +DPAA2, netdev maintainers
> Hi,
> 
> 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.
> 
> 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 message
> at 100% cpu. So, I changed it to a WARN_ONCE() to get the call trace, which
> is attached below.
> 

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
_______________________________________________
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iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply	other threads:[~2021-09-09 21:16 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-18 12:54 [PATCH] dma debug: report -EEXIST errors in add_dma_entry Hamza Mahfooz
2021-05-18 12:54 ` Hamza Mahfooz
2021-06-22  7:41 ` Christoph Hellwig
2021-06-22  7:41   ` Christoph Hellwig
2021-09-09  3:33 ` DPAA2 triggers, " Jeremy Linton
2021-09-09  3:33   ` Jeremy Linton
2021-09-09 21:16   ` Ioana Ciornei [this message]
2021-09-09 21:16     ` Ioana Ciornei
2021-09-10 10:23   ` Christoph Hellwig
2021-09-10 10:23     ` Christoph Hellwig
2021-09-14 15:45   ` Ioana Ciornei
2021-09-14 15:45     ` Ioana Ciornei
2021-09-30 13:37     ` Karsten Graul
2021-09-30 13:37       ` Karsten Graul
2021-10-01 12:52       ` Gerald Schaefer
2021-10-01 12:52         ` Gerald Schaefer
2021-10-06 13:10         ` Gerald Schaefer
2021-10-06 13:10           ` Gerald Schaefer
2021-10-06 13:21           ` Gerald Schaefer
2021-10-06 13:21             ` Gerald Schaefer
2021-10-06 14:23           ` Robin Murphy
2021-10-06 14:23             ` Robin Murphy
2021-10-06 15:06             ` Gerald Schaefer
2021-10-06 15:06               ` Gerald Schaefer
2021-10-07 10:59             ` Karsten Graul
2021-10-07 10:59               ` Karsten Graul
2021-10-07 16:40               ` Gerald Schaefer
2021-10-07 16:40                 ` Gerald Schaefer
2021-10-11 11:47               ` Christoph Hellwig
2021-10-11 11:47                 ` Christoph Hellwig
2021-10-01  4:19     ` Christoph Hellwig
2021-10-01  4:19       ` Christoph Hellwig
2021-10-01  9:21       ` Ioana Ciornei
2021-10-01  9:21         ` Ioana Ciornei

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