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Re: [PATCH 1/5] xen/arm: smmuv1: Handle stream IDs more dynamically
- To: Julien Grall <julien@xxxxxxx>
- From: Rahul Singh <Rahul.Singh@xxxxxxx>
- Date: Tue, 16 Mar 2021 17:03:00 +0000
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- Thread-topic: [PATCH 1/5] xen/arm: smmuv1: Handle stream IDs more dynamically
Hello Julien
> On 16 Mar 2021, at 3:16 pm, Julien Grall <julien@xxxxxxx> wrote:
>
> Hi Rahul,
>
> On 09/03/2021 18:19, Rahul Singh wrote:
>> Backport commit 21174240e4f4439bb8ed6c116cdbdc03eba2126e
>> "iommu/arm-smmu: Handle stream IDs more dynamically" from the Linux
>> ernel.
>> This patch is the preparatory work to fix the stream match conflict
>> when two devices have the same stream-id.
>> Original commit message:
>> Rather than assuming fixed worst-case values for stream IDs and SMR
>> masks, keep track of whatever implemented bits the hardware actually
>> reports. This also obviates the slightly questionable validation of SMR
>> fields in isolation - rather than aborting the whole SMMU probe for a
>> hardware configuration which is still architecturally valid, we can
>> simply refuse masters later if they try to claim an unrepresentable ID
>> or mask (which almost certainly implies a DT error anyway).
>
> For single backported and verbatim commit, it is common to keep the origin
> tags (I usually indent them) to show who is the original author of the patch.
>
> Since 7936671da9fbf645d6bb207608f7b81c27f992de from Wei Chen as an example.
Thanks for reviewing the series. I will add the origin tags in the next version.
Regards,
Rahul
>
> Cheers,
>
> --
> Julien Grall
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