linux-kernel - Re: [PATCH v3 2/2] gpu: nova-core: add boot42 support for next-gen GPUs

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Message-ID: <b9686644-e2dd-4abf-9dd7-fc12081f400f@nvidia.com>
Date: Wed, 29 Oct 2025 17:35:13 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Timur Tabi <ttabi@...dia.com>, "dakr@...nel.org" <dakr@...nel.org>
Cc: Alexandre Courbot <acourbot@...dia.com>,
 "lossin@...nel.org" <lossin@...nel.org>,
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Subject: Re: [PATCH v3 2/2] gpu: nova-core: add boot42 support for next-gen
 GPUs

On 10/29/25 5:31 PM, Timur Tabi wrote:
> On Wed, 2025-10-29 at 17:29 -0700, John Hubbard wrote:
>> That, combined with Timur's comment, made me realize that .is_next_gen()
>> can be made reliable enough that we don't even need is_nv04() at all.
> 
> Please, not "next gen".  Technically speaking, BOOT42 is "current gen" and BOOT0 is "last gen".
> 
> And this all assumes that BOOT42 won't be replaced by something even bigger for
> Blackwell+++++++++++.

OK, I think this wants to be called use_boot42_instead(), approximately.

...and I've fortified the code accordingly:

impl NV_PMC_BOOT_0 {
    pub(crate) fn use_boot42_instead(self) -> bool {
        // "Future" GPUs (some time after Rubin) will set `architecture_0`
        // to 0, and `architecture_1` to 1, and put the architecture details in
        // boot42 instead.
        self.architecture_0() == 0 && self.architecture_1() == 1
    }

thanks,
-- 
John Hubbard