linux-kernel - Re: [PATCH RESEND v3] iommu/tegra-smmu: Add missing locks around mapping operations

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Message-ID: <9f7b042e-db46-dd5b-acb8-9b1e8213fa62@gmail.com>
Date:   Fri, 4 Sep 2020 12:19:55 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        iommu@...ts.linux-foundation.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v3] iommu/tegra-smmu: Add missing locks around
 mapping operations

04.09.2020 12:05, Joerg Roedel пишет:
> On Fri, Aug 14, 2020 at 07:22:52PM +0300, Dmitry Osipenko wrote:
>> The mapping operations of the Tegra SMMU driver are subjected to a race
>> condition issues because SMMU Address Space isn't allocated and freed
>> atomically, while it should be. This patch makes the mapping operations
>> atomic, it fixes an accidentally released Host1x Address Space problem
>> which happens while running multiple graphics tests in parallel on
>> Tegra30, i.e. by having multiple threads racing with each other in the
>> Host1x's submission and completion code paths, performing IOVA mappings
>> and unmappings in parallel.
>>
>> Cc: <stable@...r.kernel.org>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> 
> Thierry, does this change look good to you?
> 

Hello Joerg and Thierry,

Please take into account that there is a v5 now that I sent out a day
ago, it's more optimized version and supports both atomic and non-atomic
GFP flags for the mapping operation.