linux-kernel - Re: [RFC PATCH v1] memory: tegra: Block DMA for clients HW on a faulty memory access

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Message-ID: <2607799.I2xByD6lqT@dimapc>
Date:   Sat, 04 Aug 2018 14:53:19 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Mikko Perttunen <cyndis@...si.fi>
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1] memory: tegra: Block DMA for clients HW on a faulty memory access

On Tuesday, 8 May 2018 19:58:41 MSK Dmitry Osipenko wrote:
> Currently Memory Controller informs about erroneous memory accesses done
> by memory clients and that's it. Let's make it to block whole HW unit
> that corresponds to the misbehaving memory client in order to try to avoid
> memory corruptions and to stop deliberate attempts of manipulation by a
> misbehaving client.

Guys, any comments? That is a kinda useful feature, in worst case only some of 
memory could get corrupted instead of trashing the whole memory. In my 
experience with T20/30, the interrupt handling latency is low and blocking 
happens immediately after the first page fault.