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

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Date:   Fri, 11 Sep 2020 18:08:53 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     freedreno@...ts.freedesktop.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, Luca Weiss <luca@...tu.xyz>,
        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>,
        Bjorn Andersson <bjorn.andersson@...aro.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: [PATCH] drm/msm/adreno: fix probe without iommu

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>
---
 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