Hi Varun,

Can you allude to the use case here you need this information for? Just so we can flush out any other information needed.  With the reference of LTS I was thinking the platform was trying to find out if a security fix is supported or a hardware erratum mitigation was available. Is that the type of use case we are talking about here? Anything else?

Thanks

Joanna

From: Varun Wadekar via TF-A <tf-a@lists.trustedfirmware.org>
Date: Wednesday, 11 January 2023 at 14:33
To: Sandrine Bailleux <Sandrine.Bailleux@arm.com>
Cc: tfa-lts@lists.trustedfirmware.org <tfa-lts@lists.trustedfirmware.org>, tf-a@lists.trustedfirmware.org <tf-a@lists.trustedfirmware.org>
Subject: [TF-A] Re: Query BL31 version from NWd

Hi Sandrine,

This is a good start. Can you help define the SMC FID and the return value for this use case?

Please consider the requirement to return a 3-digit value (x.y.z) to support LTS versions too.

Thanks.

-----Original Message-----
From: Sandrine Bailleux <sandrine.bailleux@arm.com>
Sent: Wednesday, 11 January 2023 8:50 AM
To: Varun Wadekar <vwadekar@nvidia.com>
Cc: tfa-lts@lists.trustedfirmware.org; tf-a@lists.trustedfirmware.org
Subject: Re: [TF-A] Query BL31 version from NWd

External email: Use caution opening links or attachments


Hello Varun,

Happy New Year to you too!

This sounds like a reasonable idea to me.

JFYI we introduced an interface to query TF-A semantic version in the following patch:


https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.trustedfirmware.org%2FTF-A%2Ftrusted-firmware-a.git%2Fcommit%2F%3Fid%3Ddddf4283b043ad0a81d27bd5bb2f0c647c511e11&data=05%7C01%7Cvwadekar%40nvidia.com%7Cc58d847c8e5645c4569a08daf3b0e57f%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C638090238346510461%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=4q%2BhHaTtpL0AMGzc78UfTnygDnr0Jbj0sHn519uJd84%3D&reserved=0

This is available for any BLx image, not just BL31. At the time, it was just meant to be used internally within TF-A so it's missing the SMC handler to return this information to normal world.

Best regards,
Sandrine

On 1/10/23 23:42, Varun Wadekar via TF-A wrote:
> Hi,
>
> Happy new year!
>
> For NVIDIA Tegra platforms, we need the capability to query the BL31
> version (e.g. 2.7, 2.8, 2.8.x) from the NWd at runtime. I could not
> find an FID that returns this value.
>
> I propose we introduce a new runtime service in bl31 that returns the
> version_string to the NWd to support this requirement.
>
> Thoughts?
>
> -Varun
>
>
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