linux-kernel - Re: [PATCH v3 05/30] gpu: nova-core: use GPU Architecture to simplify HAL selections

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Message-ID: <f9b0e77c-342e-4d08-8170-660a6c87b0b4@nvidia.com>
Date: Sun, 8 Feb 2026 17:47:29 -0800
From: John Hubbard <jhubbard@...dia.com>
To: Timur Tabi <ttabi@...dia.com>, Alexandre Courbot <acourbot@...dia.com>,
 "dakr@...nel.org" <dakr@...nel.org>
Cc: "aliceryhl@...gle.com" <aliceryhl@...gle.com>,
 "lossin@...nel.org" <lossin@...nel.org>,
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 "ojeda@...nel.org" <ojeda@...nel.org>, "tmgross@...ch.edu"
 <tmgross@...ch.edu>,
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 "gary@...yguo.net" <gary@...yguo.net>, Alistair Popple <apopple@...dia.com>
Subject: Re: [PATCH v3 05/30] gpu: nova-core: use GPU Architecture to simplify
 HAL selections

On 2/6/26 10:02 AM, Timur Tabi wrote:
> On Thu, 2026-02-05 at 20:20 -0800, John Hubbard wrote:
>> +        // TODO: support GA100. Its boot sequence is a lot like Turing, except that it handles
>> the
>> +        // FRTS steps differently (specifically, it skips FWSEC-FRTS).
> 
> Where did you get this from?  I haven't started looking at GA100 yet, but this is news to me.
> 

 From Open RM:

GA100 returns FRTS size = 0 via kgspGetFrtsSize__0x00000000, while all
other Turing/Ampere/Ada chips use kgspGetFrtsSize_TU102, which returns
1MB.

GA100's kgspPrepareForFwsecFrts is stubbed out. It returns
NV_ERR_NOT_SUPPORTED, vs. the real kgspPrepareForFwsecFrts_TU102 used by
GA102+.

The boot sequence in kernel_gsp_tu102.c guards FWSEC-FRTS with if
(kgspGetFrtsSize_HAL(...) > 0), so GA100 (returning 0) skips it
entirely.

thanks,
-- 
John Hubbard