From: Joerg Roedel <jroedel@suse.de>
To: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: iommu@lists.linux-foundation.org,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [Regression] "iommu/amd: Relax locking in dma_ops path" makes tg3 ethernet transmit queue timeout
Date: Mon, 18 May 2020 15:32:09 +0200 [thread overview]
Message-ID: <20200518133209.GM8135@suse.de> (raw)
In-Reply-To: <4E9B03FB-9DA5-4831-B4CE-A0AA645D3F22@canonical.com>
On Mon, May 18, 2020 at 05:06:45PM +0800, Kai-Heng Feng wrote:
> Particularly, as soon as the spinlock is removed, the issue can be reproduced.
> Function domain_flush_complete() doesn't seem to affect the status.
>
> However, the .map_page callback was removed by be62dbf554c5
> ("iommu/amd: Convert AMD iommu driver to the dma-iommu api"), so
> there's no easy revert for this issue.
>
> This is still reproducible as of today's mainline kernel, v5.7-rc6.
Is there any error message from the IOMMU driver?
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WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <jroedel@suse.de>
To: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: iommu@lists.linux-foundation.org,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [Regression] "iommu/amd: Relax locking in dma_ops path" makes tg3 ethernet transmit queue timeout
Date: Mon, 18 May 2020 15:32:09 +0200 [thread overview]
Message-ID: <20200518133209.GM8135@suse.de> (raw)
In-Reply-To: <4E9B03FB-9DA5-4831-B4CE-A0AA645D3F22@canonical.com>
On Mon, May 18, 2020 at 05:06:45PM +0800, Kai-Heng Feng wrote:
> Particularly, as soon as the spinlock is removed, the issue can be reproduced.
> Function domain_flush_complete() doesn't seem to affect the status.
>
> However, the .map_page callback was removed by be62dbf554c5
> ("iommu/amd: Convert AMD iommu driver to the dma-iommu api"), so
> there's no easy revert for this issue.
>
> This is still reproducible as of today's mainline kernel, v5.7-rc6.
Is there any error message from the IOMMU driver?
next prev parent reply other threads:[~2020-05-18 13:32 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-18 9:06 [Regression] "iommu/amd: Relax locking in dma_ops path" makes tg3 ethernet transmit queue timeout Kai-Heng Feng
2020-05-18 9:06 ` Kai-Heng Feng
2020-05-18 13:32 ` Joerg Roedel [this message]
2020-05-18 13:32 ` Joerg Roedel
2020-05-18 14:05 ` Kai-Heng Feng
2020-05-18 14:05 ` Kai-Heng Feng
2020-05-18 15:32 ` Kai-Heng Feng
2020-05-18 15:32 ` Kai-Heng Feng
2020-06-29 12:33 ` Kai-Heng Feng
2020-06-29 12:33 ` Kai-Heng Feng
2020-08-21 13:43 ` Joerg Roedel
2020-08-21 13:43 ` Joerg Roedel
2020-08-21 13:50 ` Kai-Heng Feng
2020-08-21 13:50 ` Kai-Heng Feng
2020-08-21 14:43 ` Joerg Roedel
2020-08-21 14:43 ` Joerg Roedel
2020-08-23 13:19 ` Kai-Heng Feng
2020-08-23 13:19 ` Kai-Heng Feng
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