linux-kernel - Re: [PATCH v8 5/5] drm/i915/uapi: document behaviour for DG2 64K support

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Date:   Fri, 18 Feb 2022 11:42:23 -0800
From:   Jordan Justen <jordan.l.justen@...el.com>
To:     Ramalingam C <ramalingam.c@...el.com>,
        Robert Beckett <bob.beckett@...labora.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthew Auld <matthew.auld@...el.com>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>,
        Simon Ser <contact@...rsion.fr>,
        Pekka Paalanen <ppaalanen@...il.com>,
        Kenneth Graunke <kenneth@...tecape.org>,
        mesa-dev@...ts.freedesktop.org, Tony Ye <tony.ye@...el.com>,
        Slawomir Milczarek <slawomir.milczarek@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 5/5] drm/i915/uapi: document behaviour for DG2 64K
 support

Ramalingam C <ramalingam.c@...el.com> writes:

> On 2022-02-18 at 18:06:00 +0000, Robert Beckett wrote:
>> 
>> If desired, we can make the wording clearer, maybe something like:
>> 
>> "To keep things simple for userland, we mandate that any GTT mappings
>> must be aligned to 2MB. The kernel will internally pad them out to the next
>> 2MB boundary"
>
> Added the extra information in next version @
> https://patchwork.freedesktop.org/patch/475166/?series=100419&rev=1
>
> Jordan, hope this explanation clears your doubt.

Ok. It sounds like what we are doing in Mesa matches what is required by
hardware and the kernel. Thanks.

-Jordan