linux-kernel - Re: [Nouveau] [RFC 0/4] Implement full clockgating for Kepler1 and 2

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Message-ID: <703110bc-91c8-d872-7709-5dec7aa7c5b0@kapsi.fi>
Date:   Wed, 17 Jan 2018 23:11:13 +0200
From:   Mikko Perttunen <cyndis@...si.fi>
To:     Lyude Paul <lyude@...hat.com>, nouveau@...ts.freedesktop.org
Cc:     Kate Stewart <kstewart@...uxfoundation.org>,
        David Airlie <airlied@...ux.ie>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Alexandre Courbot <acourbot@...dia.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Nouveau] [RFC 0/4] Implement full clockgating for Kepler1 and 2

On 01/16/2018 12:06 AM, Lyude Paul wrote:
> It's here! After a lot of investigation, rewrites, and traces, I present
> the patch series to implement all known levels of clockgating for
> Kepler1 and Kepler2 GPUs.
> 
> Starting with Fermi GPUs (this is probably present on earlier GPUs as
> well, but with a far less easy to manage interface), nvidia added two
> clockgating levels that are handled mostly in firmware (with the
> exception of course, of the driver initially programming all of the
> register values containing engine delays and that stuff):
>    - CG_CTRL - Main register for enabling/disabling clockgating for
>      engines and hw blocks
>    - BLCG - "Block-level clockgating", a deeper level of clockgating
> Starting with kepler2 as well, nvidia also introduced:
>    - SLCG - "??? clockgating" even deeper level of clockgating

FWIW, SLCG stands for "second level clock gating".

Cheers,
Mikko