From: thomas.petazzoni@free-electrons.com (Thomas Petazzoni)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 1/2] ARM: dma-mapping: Don't use outer_flush_range when the L2C is coherent
Date: Tue, 29 Sep 2015 19:55:14 +0200 [thread overview]
Message-ID: <20150929195514.277efd80@free-electrons.com> (raw)
In-Reply-To: <20150929174835.GO21513@n2100.arm.linux.org.uk>
Hello,
On Tue, 29 Sep 2015 18:48:35 +0100, Russell King - ARM Linux wrote:
> > It might very well be the case. If there's enough PCIe traffic and a
> > PL310 cache maintenance operation happening at the same time, the
> > system will lockup. I'm a bit surprised that just the initialization of
> > the PCIe card generates enough traffic to trigger the deadlock, but
> > maybe I'm underestimating the problem.
>
> It isn't every boot - the board has booted around 240 kernels so far and
> maybe 5% of them have needed the reset button pressed because of this.
> It only happens when I have the SATA card connected. I don't have any
> drives on the SATA card at the moment though.
Hum, ok. Then I'm not sure it's the same problem. I believe it's
unlikely that the few PCIe accesses used just to enumerate the PCIe
device and initialize it are enough to cause the deadlock. But I don't
have (and anyway wouldn't fully understand) all the details about this
issue, so I can't say for sure.
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Jason Cooper <jason@lakedaemon.net>, Andrew Lunn <andrew@lunn.ch>,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
Ezequiel Garcia <ezequiel.garcia@free-electrons.com>,
linux-arm-kernel@lists.infradead.org,
Maxime Ripard <maxime.ripard@free-electrons.com>,
Boris BREZILLON <boris.brezillon@free-electrons.com>,
Lior Amsalem <alior@marvell.com>,
Tawfik Bayouk <tawfik@marvell.com>,
Nadav Haklai <nadavh@marvell.com>,
stable@vger.kernel.org
Subject: Re: [PATCH v4 1/2] ARM: dma-mapping: Don't use outer_flush_range when the L2C is coherent
Date: Tue, 29 Sep 2015 19:55:14 +0200 [thread overview]
Message-ID: <20150929195514.277efd80@free-electrons.com> (raw)
In-Reply-To: <20150929174835.GO21513@n2100.arm.linux.org.uk>
Hello,
On Tue, 29 Sep 2015 18:48:35 +0100, Russell King - ARM Linux wrote:
> > It might very well be the case. If there's enough PCIe traffic and a
> > PL310 cache maintenance operation happening at the same time, the
> > system will lockup. I'm a bit surprised that just the initialization of
> > the PCIe card generates enough traffic to trigger the deadlock, but
> > maybe I'm underestimating the problem.
>
> It isn't every boot - the board has booted around 240 kernels so far and
> maybe 5% of them have needed the reset button pressed because of this.
> It only happens when I have the SATA card connected. I don't have any
> drives on the SATA card at the moment though.
Hum, ok. Then I'm not sure it's the same problem. I believe it's
unlikely that the few PCIe accesses used just to enumerate the PCIe
device and initialize it are enough to cause the deadlock. But I don't
have (and anyway wouldn't fully understand) all the details about this
issue, so I can't say for sure.
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
next prev parent reply other threads:[~2015-09-29 17:55 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-29 16:50 [PATCH v4 0/2] Fix dma mapping when the cache is coherent Gregory CLEMENT
2015-09-29 16:50 ` [PATCH v4 1/2] ARM: dma-mapping: Don't use outer_flush_range when the L2C " Gregory CLEMENT
2015-09-29 16:50 ` Gregory CLEMENT
2015-09-29 17:10 ` Russell King - ARM Linux
2015-09-29 17:10 ` Russell King - ARM Linux
2015-09-29 17:30 ` Thomas Petazzoni
2015-09-29 17:30 ` Thomas Petazzoni
2015-09-29 17:48 ` Russell King - ARM Linux
2015-09-29 17:48 ` Russell King - ARM Linux
2015-09-29 17:55 ` Thomas Petazzoni [this message]
2015-09-29 17:55 ` Thomas Petazzoni
2015-09-30 9:28 ` Gregory CLEMENT
2015-09-30 9:28 ` Gregory CLEMENT
2015-09-29 16:50 ` [PATCH v4 2/2] ARM: dma-mapping: Fix the coherent case when iommu is used Gregory CLEMENT
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