linux-kernel - Re: [PATCH v6 0/5] drm/nouveau: Enable variable page sizes and compression

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Message-ID: <0258c7b5cf7adb78708be86de50a39815b6a4982.camel@redhat.com>
Date: Wed, 12 Nov 2025 12:56:02 -0500
From: Lyude Paul <lyude@...hat.com>
To: Mary Guillemard <mary@...y.zone>, Mohamed Ahmed	
 <mohamedahmedegypt2001@...il.com>, James Jones <jajones@...dia.com>, Danilo
 Krummrich <dakr@...nel.org>, 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>
Cc: dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, Ben Skeggs <bskeggs@...dia.com>
Subject: Re: [PATCH v6 0/5] drm/nouveau: Enable variable page sizes and
 compression

Enumerating objects: 56, done.
Counting objects: 100% (56/56), done.
Delta compression using up to 20 threads
Compressing objects: 100% (43/43), done.
Writing objects: 100% (43/43), 6.83 KiB | 2.28 MiB/s, done.
Total 43 (delta 39), reused 0 (delta 0), pack-reused 0 (from 0)
remote: Checking connectivity: 43, done.
To ssh://ssh.gitlab.freedesktop.org/drm/misc/kernel.git
   86db652fc22f..85ce566b3624  drm-misc-next -> drm-misc-next
Pushing drm-misc-fixes to for-linux-next-fixes... Everything up-to-date
Done.

Thanks!

On Mon, 2025-11-10 at 16:32 +0100, Mary Guillemard wrote:
> The new VM_BIND interface only supported 4K pages. This was problematic as
> it left performance on the table because GPUs don't have sophisticated TLB
> and page walker hardware. 
> 
> Additionally, the HW can only do compression on large (64K) and huge (2M)
> pages, which is a major performance booster (>50% in some cases).
> 
> This patchset sets out to add support for larger page sizes and also
> enable compression and set the compression tags when userspace binds with
> the corresponding PTE kinds and alignment. It also increments the nouveau
> version number which allows userspace to use compression only when the
> kernel actually supports both features and avoid breaking the system if a
> newer mesa version is paired with an older kernel version.
> 
> For the associated userspace MR, please see !36450:
> https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36450
> 
> - v6: Use drm_WARN_ONCE instead of dev_warn_once.
> - v5: Add reviewed-by tags, use dev_warn_once() instead of WARN_ON().
> - v4: Fix missing parenthesis in second patch in the series.
> - v3: Add reviewed-by tags, revert page selection logic to v1 behavior.
> - v2: Implement review comments, change page selection logic.
> - v1: Initial implementation.
> 
> Signed-off-by: Mary Guillemard <mary@...y.zone>
> ---
> Ben Skeggs (2):
>       drm/nouveau/mmu/gp100: Remove unused/broken support for compression
>       drm/nouveau/mmu/tu102: Add support for compressed kinds
> 
> Mary Guillemard (2):
>       drm/nouveau/uvmm: Prepare for larger pages
>       drm/nouveau/uvmm: Allow larger pages
> 
> Mohamed Ahmed (1):
>       drm/nouveau/drm: Bump the driver version to 1.4.1 to report new features
> 
>  drivers/gpu/drm/nouveau/nouveau_drv.h              |   4 +-
>  drivers/gpu/drm/nouveau/nouveau_uvmm.c             | 102 +++++++++++++++++----
>  drivers/gpu/drm/nouveau/nouveau_uvmm.h             |   1 +
>  drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp100.c |  69 ++++++++------
>  drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp10b.c |   4 +-
>  5 files changed, 131 insertions(+), 49 deletions(-)
> ---
> base-commit: a2b0c33e9423cd06133304e2f81c713849059b10
> change-id: 20251110-nouveau-compv6-c723a93bc33b
> 
> Best regards,

-- 
Cheers,
 Lyude Paul (she/her)
 Senior Software Engineer at Red Hat

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