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drm/msm: register a fault handler for display mmu faults

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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: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jessica 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: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
This commit is contained in:
Abhinav Kumar 2025-02-19 11:49:17 -08:00 committed by Dmitry Baryshkov
parent 0699018b41
commit eabba31a83
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/msm/msm_kms.c
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@ -164,12 +164,23 @@ void msm_crtc_disable_vblank(struct drm_crtc *crtc)
vblank_ctrl_queue_work(priv, crtc, false); 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 *msm_kms_init_aspace(struct drm_device *dev)
{ {
struct msm_gem_address_space *aspace; struct msm_gem_address_space *aspace;
struct msm_mmu *mmu; struct msm_mmu *mmu;
struct device *mdp_dev = dev->dev; struct device *mdp_dev = dev->dev;
struct device *mdss_dev = mdp_dev->parent; 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; 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); mmu->funcs->destroy(mmu);
} }
msm_mmu_set_fault_handler(aspace->mmu, kms, msm_kms_fault_handler);
return aspace; return aspace;
} }