linux-kernel - Re: [PATCH 3/5] drm/nouveau/mmu/gp100: Remove unused/broken support for compression

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Message-Id: <DDBIT5J2HUWO.2MQPD4H5G4A44@kernel.org>
Date: Mon, 06 Oct 2025 22:27:13 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Mohamed Ahmed" <mohamedahmedegypt2001@...il.com>
Cc: <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>, "Mary
 Guillemard" <mary@...y.zone>, "Faith Ekstrand"
 <faith.ekstrand@...labora.com>, "Ben Skeggs" <bskeggs@...dia.com>, "Lyude
 Paul" <lyude@...hat.com>, "Maarten Lankhorst"
 <maarten.lankhorst@...ux.intel.com>, "Maxime Ripard" <mripard@...nel.org>,
 "Thomas Zimmermann" <tzimmermann@...e.de>, "David Airlie"
 <airlied@...il.com>, "Simona Vetter" <simona@...ll.ch>,
 <nouveau@...ts.freedesktop.org>
Subject: Re: [PATCH 3/5] drm/nouveau/mmu/gp100: Remove unused/broken support
 for compression

On Mon Oct 6, 2025 at 9:13 PM CEST, Mohamed Ahmed wrote:
> From: Ben Skeggs <bskeggs@...dia.com>
>
> From GP100 onwards it's not possible to initialise comptag RAM without
> PMU firmware, which nouveau has no support for.
>
> As such, this code is essentially a no-op and will always revert to the
> equivalent non-compressed kind due to comptag allocation failure.  It's
> also broken for the needs of VM_BIND/Vulkan.
>
> Remove the code entirely to make way for supporting compression on GPUs
> that support GSM-RM.
>
> Signed-off-by: Ben Skeggs <bskeggs@...dia.com>

This patch is missing your SoB.