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From: Rahul Singh <Rahul.Singh@arm.com>
To: Stefano Stabellini <sstabellini@kernel.org>
Cc: xen-devel <xen-devel@lists.xenproject.org>,
	Julien Grall <julien@xen.org>,
	Bertrand Marquis <Bertrand.Marquis@arm.com>,
	"Volodymyr_Babchuk@epam.com" <Volodymyr_Babchuk@epam.com>,
	"brian.woods@xilinx.com" <brian.woods@xilinx.com>
Subject: Re: [PATCH v3 0/3] Generic SMMU Bindings
Date: Wed, 3 Feb 2021 17:14:45 +0000	[thread overview]
Message-ID: <86C6469B-2E50-41A0-A667-73E1E37E5C32@arm.com> (raw)
In-Reply-To: <alpine.DEB.2.21.2102020937480.29047@sstabellini-ThinkPad-T480s>

Hello Stefano,

> On 2 Feb 2021, at 5:44 pm, Stefano Stabellini <sstabellini@kernel.org> wrote:
> 
> On Tue, 2 Feb 2021, Rahul Singh wrote:
>> Hello Stefano,
>> 
>>> On 26 Jan 2021, at 10:58 pm, Stefano Stabellini <sstabellini@kernel.org> wrote:
>>> 
>>> Hi all,
>>> 
>>> This series introduces support for the generic SMMU bindings to
>>> xen/drivers/passthrough/arm/smmu.c.
>>> 
>>> The last version of the series was
>>> https://marc.info/?l=xen-devel&m=159539053406643
>>> 
>>> I realize that it is late for 4.15 -- I think it is OK if this series
>>> goes in afterwards.
>> 
>> I tested the series on the Juno board it is woking fine.  
>> I found one issue in SMMU driver while testing this series that is not related to this series but already existing issue in SMMU driver.
>> 
>> If there are more than one device behind SMMU and they share the same Stream-Id, SMMU driver is creating the new SMR entry without checking the already configured SMR entry if SMR entry correspond to stream-id is already configured.  Because of this I observed the stream match conflicts on Juno board.
>> 
>> (XEN) smmu: /iommu@7fb30000: Unexpected global fault, this could be serious
>> (XEN) smmu: /iommu@7fb30000: 	GFSR 0x00000004, GFSYNR0 0x00000006, GFSYNR1 0x00000000, GFSYNR2 0x00000000
>> 
>> 
>> Below two patches is required to be ported to Xen to fix the issue from Linux driver.
>> 
>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/iommu/arm-smmu.c?h=linux-5.8.y&id=1f3d5ca43019bff1105838712d55be087d93c0da
>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/iommu/arm-smmu.c?h=linux-5.8.y&id=21174240e4f4439bb8ed6c116cdbdc03eba2126e
> 
> 
> Good catch and thanks for the pointers! Do you have any interest in
> backporting these two patches or should I put them on my TODO list?

Yes I am happy to backport these patches to XEN. 
I will send the patch for review once 4.15 release branch out from master.
 
Regards,
Rahul
> 
> Unrelated to who does the job, we should discuss if it makes sense to
> try to fix the bug for 4.15. The patches don't seem trivial so I am
> tempted to say that it might be best to leave the bug unfixed for 4.15
> and fix it later.



  parent reply	other threads:[~2021-02-03 17:15 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-26 22:58 [PATCH v3 0/3] Generic SMMU Bindings Stefano Stabellini
2021-01-26 22:58 ` [PATCH v3 1/3] arm,smmu: switch to using iommu_fwspec functions Stefano Stabellini
2021-02-02 16:07   ` Rahul Singh
2021-01-26 22:58 ` [PATCH v3 2/3] arm,smmu: restructure code in preparation to new bindings support Stefano Stabellini
2021-02-02 16:09   ` Rahul Singh
2021-01-26 22:58 ` [PATCH v3 3/3] arm,smmu: add support for generic DT bindings. Implement add_device and dt_xlate Stefano Stabellini
2021-02-02 16:09   ` Rahul Singh
2021-02-02 16:07 ` [PATCH v3 0/3] Generic SMMU Bindings Rahul Singh
2021-02-02 17:44   ` Stefano Stabellini
2021-02-02 17:50     ` Julien Grall
2021-02-02 18:27       ` Stefano Stabellini
2021-02-02 18:43         ` Julien Grall
2021-02-03 17:14     ` Rahul Singh [this message]
2021-04-05 15:23 ` Julien Grall
2021-04-06 23:59   ` Stefano Stabellini
2021-04-07 15:43     ` Rahul Singh
2021-04-10  0:27     ` Stefano Stabellini
2021-04-12 10:20       ` Rahul Singh
2021-04-13  0:27         ` Stefano Stabellini
2021-04-14 10:42           ` Rahul Singh

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