[Mesa-dev] [PATCH 2/2] i965/miptree: Use the tiling from the modifier instead of the BO

[Kristian Høgsberg]

On Tue, Dec 5, 2017 at 7:57 AM, Jason Ekstrand <jason at jlekstrand.net> wrote:
> On Tue, Dec 5, 2017 at 1:22 AM, Daniel Stone <daniel at fooishbar.org> wrote:
>>
>> Hi,
>>
>> On 18 November 2017 at 00:10, Jason Ekstrand <jason at jlekstrand.net> wrote:
>> > This fixes a bug where we were taking the tiling from the BO regardless
>> > of what the modifier said.  When we got images in from Vulkan where it
>> > doesn't set the tiling on the BO, we would treat them as linear even
>> > though the modifier expressly said to treat it as Y-tiled.
>>
>> For some reason I thought Ken had already reviewed this and it landed,
>> until Kristian mentioned last night.
>
>
> There's been some discussion about what the right thing to do is here.  I've
> got a patch (which is now landed) which will make us set the tiling from
> Vulkan just like GL does.  It's rather annoying but I think that's
> marginally better.

I don't know that it's better - it reinforces the notion that you have
to make the kernel-side tiling match for the dma-buf import extension
to work. I think it'd be better to land these patches (btw, Rb: me
(can you even do parenthetical Rbs?)) and call set-tiling in mesa. The
assumption being that if the tiling doesn't match the modifier, then
maybe the producer didn't care about kernel tiling? Alternatively,
could we set bo->tiling = INCONSISTENT or such in mesa and then use
that to avoid the gtt map paths?

Kristian

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