linux-kernel - Re: [PATCH] drm/msm/adreno: fix probe without iommu

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Date:   Sat, 12 Sep 2020 22:14:42 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Luca Weiss <luca@...tu.xyz>
Cc:     freedreno@...ts.freedesktop.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Brian Masney <masneyb@...tation.org>,
        John Stultz <john.stultz@...aro.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/adreno: fix probe without iommu

On Fri 11 Sep 11:08 CDT 2020, Luca Weiss wrote:

> The function iommu_domain_alloc returns NULL on platforms without IOMMU
> such as msm8974. This resulted in PTR_ERR(-ENODEV) being assigned to
> gpu->aspace so the correct code path wasn't taken.
> 
> Fixes: ccac7ce373c1 ("drm/msm: Refactor address space initialization")
> Signed-off-by: Luca Weiss <luca@...tu.xyz>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/gpu/drm/msm/adreno/adreno_gpu.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> index 862dd35b27d3..6e8bef1a9ea2 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> @@ -189,10 +189,16 @@ struct msm_gem_address_space *
>  adreno_iommu_create_address_space(struct msm_gpu *gpu,
>  		struct platform_device *pdev)
>  {
> -	struct iommu_domain *iommu = iommu_domain_alloc(&platform_bus_type);
> -	struct msm_mmu *mmu = msm_iommu_new(&pdev->dev, iommu);
> +	struct iommu_domain *iommu;
> +	struct msm_mmu *mmu;
>  	struct msm_gem_address_space *aspace;
>  
> +	iommu = iommu_domain_alloc(&platform_bus_type);
> +	if (!iommu)
> +		return NULL;
> +
> +	mmu = msm_iommu_new(&pdev->dev, iommu);
> +
>  	aspace = msm_gem_address_space_create(mmu, "gpu", SZ_16M,
>  		0xffffffff - SZ_16M);
>  
> -- 
> 2.28.0
>