drm/msm/adreno: stall translation on fault for all GPU families

The commit e25e92e0 ("drm/msm: devcoredump iommu fault support")
enabled SMMU stalling to collect GPU state, but only for a6xx. It tied
enabling the stall with tha per-instance pagetables creation.

Since that commit SoCs with a5xx also gained support for
adreno-smmu-priv. Move stalling into generic code and add corresponding
resume_translation calls.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/522720/
Link: https://lore.kernel.org/r/20230214123504.3729522-2-dmitry.baryshkov@linaro.orgSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/adreno/a5xx_gpu.c

@@ -1103,6 +1103,8 @@ static int a5xx_fault_handler(void *arg, unsigned long iova, int flags, void *da
 			gpu_read(gpu, REG_A5XX_CP_SCRATCH_REG(6)),
 			gpu_read(gpu, REG_A5XX_CP_SCRATCH_REG(7)));
 
+	gpu->aspace->mmu->funcs->resume_translation(gpu->aspace->mmu);
+
 	return 0;
 }
 

drivers/gpu/drm/msm/adreno/adreno_gpu.c

@@ -208,7 +208,7 @@ adreno_iommu_create_address_space(struct msm_gpu *gpu,
 	struct msm_gem_address_space *aspace;
 	u64 start, size;
 
-	mmu = msm_iommu_new(&pdev->dev, quirks);
+	mmu = msm_iommu_gpu_new(&pdev->dev, gpu, quirks);
 	if (IS_ERR_OR_NULL(mmu))
 		return ERR_CAST(mmu);
 

drivers/gpu/drm/msm/msm_iommu.c

@@ -237,13 +237,6 @@ struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent)
 	if (!ttbr1_cfg)
 		return ERR_PTR(-ENODEV);
 
-	/*
-	 * Defer setting the fault handler until we have a valid adreno_smmu
-	 * to avoid accidentially installing a GPU specific fault handler for
-	 * the display's iommu
-	 */
-	iommu_set_fault_handler(iommu->domain, msm_fault_handler, iommu);
-
 	pagetable = kzalloc(sizeof(*pagetable), GFP_KERNEL);
 	if (!pagetable)
 		return ERR_PTR(-ENOMEM);
@@ -271,9 +264,6 @@ struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent)
 	 * the arm-smmu driver as a trigger to set up TTBR0
 	 */
 	if (atomic_inc_return(&iommu->pagetables) == 1) {
-		/* Enable stall on iommu fault: */
-		adreno_smmu->set_stall(adreno_smmu->cookie, true);
-
 		ret = adreno_smmu->set_ttbr0_cfg(adreno_smmu->cookie, &ttbr0_cfg);
 		if (ret) {
 			free_io_pgtable_ops(pagetable->pgtbl_ops);
@@ -302,6 +292,7 @@ static int msm_fault_handler(struct iommu_domain *domain, struct device *dev,
 		unsigned long iova, int flags, void *arg)
 {
 	struct msm_iommu *iommu = arg;
+	struct msm_mmu *mmu = &iommu->base;
 	struct adreno_smmu_priv *adreno_smmu = dev_get_drvdata(iommu->base.dev);
 	struct adreno_smmu_fault_info info, *ptr = NULL;
 
@@ -314,6 +305,10 @@ static int msm_fault_handler(struct iommu_domain *domain, struct device *dev,
 		return iommu->base.handler(iommu->base.arg, iova, flags, ptr);
 
 	pr_warn_ratelimited("*** fault: iova=%16lx, flags=%d\n", iova, flags);
+
+	if (mmu->funcs->resume_translation)
+		mmu->funcs->resume_translation(mmu);
+
 	return 0;
 }
 
@@ -321,6 +316,7 @@ static void msm_iommu_resume_translation(struct msm_mmu *mmu)
 {
 	struct adreno_smmu_priv *adreno_smmu = dev_get_drvdata(mmu->dev);
 
+	if (adreno_smmu->resume_translation)
 		adreno_smmu->resume_translation(adreno_smmu->cookie, true);
 }
 
@@ -406,3 +402,23 @@ struct msm_mmu *msm_iommu_new(struct device *dev, unsigned long quirks)
 
 	return &iommu->base;
 }
+
+struct msm_mmu *msm_iommu_gpu_new(struct device *dev, struct msm_gpu *gpu, unsigned long quirks)
+{
+	struct adreno_smmu_priv *adreno_smmu = dev_get_drvdata(dev);
+	struct msm_iommu *iommu;
+	struct msm_mmu *mmu;
+
+	mmu = msm_iommu_new(dev, quirks);
+	if (IS_ERR(mmu))
+		return mmu;
+
+	iommu = to_msm_iommu(mmu);
+	iommu_set_fault_handler(iommu->domain, msm_fault_handler, iommu);
+
+	/* Enable stall on iommu fault: */
+	if (adreno_smmu->set_stall)
+		adreno_smmu->set_stall(adreno_smmu->cookie, true);
+
+	return mmu;
+}

drivers/gpu/drm/msm/msm_mmu.h

@@ -41,6 +41,7 @@ static inline void msm_mmu_init(struct msm_mmu *mmu, struct device *dev,
 }
 
 struct msm_mmu *msm_iommu_new(struct device *dev, unsigned long quirks);
+struct msm_mmu *msm_iommu_gpu_new(struct device *dev, struct msm_gpu *gpu, unsigned long quirks);
 struct msm_mmu *msm_gpummu_new(struct device *dev, struct msm_gpu *gpu);
 
 static inline void msm_mmu_set_fault_handler(struct msm_mmu *mmu, void *arg,