Commit eabba31a authored by Abhinav Kumar's avatar Abhinav Kumar Committed by Dmitry Baryshkov
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drm/msm: register a fault handler for display mmu faults 



In preparation to register a iommu fault handler for display
related modules, register a fault handler for the backing
mmu object of msm_kms.

Currently, the fault handler only captures the display snapshot
but we can expand this later if more information needs to be
added to debug display mmu faults.

Signed-off-by: default avatarAbhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: default avatarJessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/638359/
Link: https://lore.kernel.org/r/20250219-abhinavk-smmu-fault-handler-v3-1-aa3f0bf4434a@quicinc.com


Signed-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
parent 0699018b

drivers/gpu/drm/msm/msm_kms.c

+13 −0
Original line number Diff line number Diff line
@@ -164,12 +164,23 @@ void msm_crtc_disable_vblank(struct drm_crtc *crtc) 
	vblank_ctrl_queue_work(priv, crtc, false);

}



static int msm_kms_fault_handler(void *arg, unsigned long iova, int flags, void *data)

{

	struct msm_kms *kms = arg;



	msm_disp_snapshot_state(kms->dev);



	return -ENOSYS;

}



struct msm_gem_address_space *msm_kms_init_aspace(struct drm_device *dev)

{

	struct msm_gem_address_space *aspace;

	struct msm_mmu *mmu;

	struct device *mdp_dev = dev->dev;

	struct device *mdss_dev = mdp_dev->parent;

	struct msm_drm_private *priv = dev->dev_private;

	struct msm_kms *kms = priv->kms;

	struct device *iommu_dev;



	/*
@@ -197,6 +208,8 @@ struct msm_gem_address_space *msm_kms_init_aspace(struct drm_device *dev) 
		mmu->funcs->destroy(mmu);

	}



	msm_mmu_set_fault_handler(aspace->mmu, kms, msm_kms_fault_handler);



	return aspace;

}