From: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
---
drivers/gpu/drm/msm/msm_kms.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/msm/msm_kms.c b/drivers/gpu/drm/msm/msm_kms.c
index f3326d09bdbce19d40d0b48549c330c2b836476f..cf5f15b9cd16a23e9bea820cfc096caa0d7da175 100644
--- a/drivers/gpu/drm/msm/msm_kms.c
+++ b/drivers/gpu/drm/msm/msm_kms.c
@@ -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;
}
--
2.34.1
