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From: Joerg Roedel <joro@8bytes.org>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: linux-tegra@vger.kernel.org, iommu@lists.linux-foundation.org,
	Thierry Reding <thierry.reding@gmail.com>,
	linux-kernel@vger.kernel.org,
	Jonathan Hunter <jonathanh@nvidia.com>
Subject: Re: [PATCH RESEND v3] iommu/tegra-smmu: Add missing locks around mapping operations
Date: Fri, 4 Sep 2020 11:05:19 +0200	[thread overview]
Message-ID: <20200904090519.GF6714@8bytes.org> (raw)
In-Reply-To: <20200814162252.31965-1-digetx@gmail.com>

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@vger.kernel.org>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>

Thierry, does this change look good to you?

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WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro@8bytes.org>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	iommu@lists.linux-foundation.org, linux-tegra@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH RESEND v3] iommu/tegra-smmu: Add missing locks around mapping operations
Date: Fri, 4 Sep 2020 11:05:19 +0200	[thread overview]
Message-ID: <20200904090519.GF6714@8bytes.org> (raw)
In-Reply-To: <20200814162252.31965-1-digetx@gmail.com>

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@vger.kernel.org>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>

Thierry, does this change look good to you?


  parent reply	other threads:[~2020-09-04  9:05 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-14 16:22 [PATCH RESEND v3] iommu/tegra-smmu: Add missing locks around mapping operations Dmitry Osipenko
2020-08-14 16:22 ` Dmitry Osipenko
2020-08-26 13:54 ` Sasha Levin
2020-08-26 13:54   ` Sasha Levin
2020-09-04  9:05 ` Joerg Roedel [this message]
2020-09-04  9:05   ` Joerg Roedel
2020-09-04  9:19   ` Dmitry Osipenko
2020-09-04  9:19     ` Dmitry Osipenko
2020-09-04  9:25     ` Dmitry Osipenko
2020-09-04  9:25       ` Dmitry Osipenko
2020-09-04 12:20   ` Thierry Reding
2020-09-04 12:20     ` Thierry Reding

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