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From: Robin Murphy <robin.murphy@arm.com>
To: Will Deacon <will@kernel.org>, John Garry <john.garry@huawei.com>
Cc: sagi@grimberg.me, linux-nvme@lists.infradead.org,
	Alexey Dobriyan <adobriyan@gmail.com>,
	axboe@fb.com, Keith Busch <kbusch@kernel.org>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH] nvme-pci: slimmer CQ head update
Date: Wed, 6 May 2020 17:52:06 +0100	[thread overview]
Message-ID: <3453193c-424b-1e4c-16be-279088612c68@arm.com> (raw)
In-Reply-To: <20200506163104.GD12919@willie-the-truck>

On 2020-05-06 5:31 pm, Will Deacon wrote:
> On Wed, May 06, 2020 at 05:26:35PM +0100, John Garry wrote:
>> + arm64 guys (Please note WARN below, generated when testing NVMe)
>>
>> On 06/05/2020 15:35, Christoph Hellwig wrote:> On Wed, May 06, 2020 at
>> 02:44:50PM +0100, John Garry wrote:
>>>> I'd rather hear the maintainer’s opinion before bothering testing this...
>>>
>>> As the other maintainer - please give it a spin.
>>
>> ok, so I have tested with the modification from Keith (to avoid the
>> READ_ONCE()), and it's ok for use_threaded_interrupts=1.
>>
>> However, for use_threaded_interrupts=0, I see a new issue:
>>
>> [  122.524290] WARNING: CPU: 86 PID: 1157 at
>> drivers/iommu/io-pgtable-arm.c:304
> 
> That means you're trying to map something that is already mapped.

...which is a bit of an achievement with the DMA API, but most likely 
implies that a prior dma_unmap was called with the wrong size, such that 
we only unmapped part of the IOVA region that has now been reused.

John, if you can reproduce this semi-reliably, try throwing 
DMA_API_DEBUG at it in the first instance.

Robin.

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  reply	other threads:[~2020-05-06 16:52 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-28 18:45 [PATCH] nvme-pci: slimmer CQ head update Alexey Dobriyan
2020-02-29  5:53 ` Keith Busch
2020-05-06 11:03   ` John Garry
2020-05-06 12:47     ` Keith Busch
2020-05-06 13:24       ` Alexey Dobriyan
2020-05-06 13:44         ` John Garry
2020-05-06 14:01           ` Alexey Dobriyan
2020-05-06 14:35           ` Christoph Hellwig
2020-05-06 16:26             ` John Garry
2020-05-06 16:31               ` Will Deacon
2020-05-06 16:52                 ` Robin Murphy [this message]
2020-05-06 17:02                   ` John Garry
2020-05-07  8:18                     ` John Garry
2020-05-07 11:04                       ` Robin Murphy
2020-05-07 13:55                         ` John Garry
2020-05-07 14:23                           ` Keith Busch
2020-05-07 15:11                             ` John Garry
2020-05-07 15:35                               ` Keith Busch
2020-05-07 15:41                                 ` John Garry
2020-05-08 16:16                                   ` Keith Busch
2020-05-08 17:04                                     ` John Garry
2020-05-07 16:26                                 ` Robin Murphy
2020-05-07 17:35                                   ` Keith Busch
2020-05-07 17:44                                     ` Will Deacon
2020-05-07 18:06                                       ` Keith Busch
2020-05-08 11:40                                         ` Will Deacon
2020-05-08 14:07                                           ` Keith Busch
2020-05-08 15:34                                             ` Keith Busch
2020-05-06 14:44         ` Keith Busch
2020-05-07 15:58           ` Keith Busch
2020-05-07 20:07             ` [PATCH] nvme-pci: fix "slimmer CQ head update" Alexey Dobriyan

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