linux-kernel - Re: [PATCH] iommu/rockchip: Perform a reset on shutdown

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Date:   Thu, 15 Mar 2018 15:12:10 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/rockchip: Perform a reset on shutdown

On Tue, Feb 20, 2018 at 08:25:04PM +0000, Marc Zyngier wrote:
> Trying to do a kexec whilst the iommus are still on is proving to be
> a challenging exercise. It is terribly unsafe, as we're reusing the
> memory allocated for the page tables, leading to a likely crash.
> 
> Let's implement a shutdown method that will at least try to stop
> DMA from going crazy behind our back. Note that we need to be
> extra cautious when doing so, as the IOMMU may not be clocked
> if controlled by a another master, as typical on Rockchip system.
> 
> Suggested-by: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

Applied, thanks.