linux-kernel - Re: [PATCH drm-misc-next v8 01/12] drm: manager to keep track of GPUs VA mappings

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Message-ID: <20230728142612.2ecf99ef@collabora.com>
Date:   Fri, 28 Jul 2023 14:26:12 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Maxime Ripard <mripard@...nel.org>
Cc:     Danilo Krummrich <dakr@...hat.com>, airlied@...il.com,
        daniel@...ll.ch, tzimmermann@...e.de, corbet@....net,
        christian.koenig@....com, bskeggs@...hat.com,
        Liam.Howlett@...cle.com, matthew.brost@...el.com,
        alexdeucher@...il.com, ogabbay@...nel.org, bagasdotme@...il.com,
        willy@...radead.org, jason@...kstrand.net,
        donald.robson@...tec.com, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>,
        Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH drm-misc-next v8 01/12] drm: manager to keep track of
 GPUs VA mappings

On Fri, 28 Jul 2023 13:31:36 +0200
Maxime Ripard <mripard@...nel.org> wrote:

> Hi Danilo,
> 
> On Thu, Jul 20, 2023 at 02:14:22AM +0200, Danilo Krummrich wrote:
> > Add infrastructure to keep track of GPU virtual address (VA) mappings
> > with a decicated VA space manager implementation.
> > 
> > New UAPIs, motivated by Vulkan sparse memory bindings graphics drivers
> > start implementing, allow userspace applications to request multiple and
> > arbitrary GPU VA mappings of buffer objects. The DRM GPU VA manager is
> > intended to serve the following purposes in this context.
> > 
> > 1) Provide infrastructure to track GPU VA allocations and mappings,
> >    making using an interval tree (RB-tree).
> > 
> > 2) Generically connect GPU VA mappings to their backing buffers, in
> >    particular DRM GEM objects.
> > 
> > 3) Provide a common implementation to perform more complex mapping
> >    operations on the GPU VA space. In particular splitting and merging
> >    of GPU VA mappings, e.g. for intersecting mapping requests or partial
> >    unmap requests.
> > 
> > Acked-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
> > Acked-by: Matthew Brost <matthew.brost@...el.com>
> > Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
> > Tested-by: Matthew Brost <matthew.brost@...el.com>
> > Tested-by: Donald Robson <donald.robson@...tec.com>
> > Suggested-by: Dave Airlie <airlied@...hat.com>
> > Signed-off-by: Danilo Krummrich <dakr@...hat.com>  
> 
> For some reason this breaks the drm_exec kunit patches:

Fix available here [1].

[1]https://lore.kernel.org/dri-devel/cbf4ccf9-8131-27a0-332c-6942866340d1@igalia.com/T/#t