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From: Dmitry Osipenko <digetx@gmail.com>
To: Mikko Perttunen <cyndis@kapsi.fi>
Cc: Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Peter De Schrijver <pdeschrijver@nvidia.com>,
	linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v1] memory: tegra: Block DMA for clients HW on a faulty memory access
Date: Sun, 05 Aug 2018 03:37:26 +0300	[thread overview]
Message-ID: <1797693.ge5mZLuUEu@dimapc> (raw)
In-Reply-To: <89f0794e-affa-dba0-9684-582ce5570cad@kapsi.fi>

On Sunday, 5 August 2018 03:11:57 MSK Mikko Perttunen wrote:
> One potential issue is with host1x clients where userspace processes can
> submit jobs with invalid memory accesses (addresses not mapped to
> IOMMU). If when such a failure happens, we disable the DMA for the whole
> host1x client, unrelated userspace processes may see failures even
> though there is no problem with their jobs.

Good point, I'll take a look at partial resurrection of patch [0]. Anyway I 
think it's still better to fail even the unrelated jobs, rather than to have 
corrupted memory.

[0] https://github.com/grate-driver/linux/commit/
c0351a9d01491af2b2fefc162de1c2e4fcfaa94c#diff-20226be476307cb7ec9f60e26a9c30deR378



      reply	other threads:[~2018-08-05  0:37 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-08 16:58 Dmitry Osipenko
2018-08-04 11:53 ` Dmitry Osipenko
2018-08-05  0:11   ` Mikko Perttunen
2018-08-05  0:37     ` Dmitry Osipenko [this message]

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