linux-kernel - Re: [PATCH 1/2] drm/msm: Fix address space size after refactor.

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Date:   Wed, 17 Jun 2020 19:39:08 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        Sean Paul <sean@...rly.run>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] drm/msm: Fix address space size after refactor.

On Wed, Jun 17, 2020 at 1:53 PM Eric Anholt <eric@...olt.net> wrote:
>
> Previously the address space went from 16M to ~0u, but with the
> refactor one of the 'f's was dropped, limiting us to 256MB.
> Additionally, the new interface takes a start and size, not start and
> end, so we can't just copy and paste.
>
> Fixes regressions in dEQP-VK.memory.allocation.random.*
>
> Fixes: ccac7ce373c1 ("drm/msm: Refactor address space initialization")
> Signed-off-by: Eric Anholt <eric@...olt.net>


rebased on https://patchwork.freedesktop.org/series/78281/ (which
fixed half of the problem) and pushed this and 2/2 to msm-next so it
should show up in linux-next shortly..

planning to wait a short time more to see if we find any other issues
and then send a -fixes PR

BR,
-R


> ---
>  drivers/gpu/drm/msm/adreno/adreno_gpu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> index 89673c7ed473..5db06b590943 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> @@ -194,7 +194,7 @@ adreno_iommu_create_address_space(struct msm_gpu *gpu,
>         struct msm_gem_address_space *aspace;
>
>         aspace = msm_gem_address_space_create(mmu, "gpu", SZ_16M,
> -               0xfffffff);
> +               0xffffffff - SZ_16M);
>
>         if (IS_ERR(aspace) && !IS_ERR(mmu))
>                 mmu->funcs->destroy(mmu);
> --
> 2.26.2
>