drm/msm: devcoredump iommu fault support

Wire up support to stall the SMMU on iova fault, and collect a devcore-
dump snapshot for easier debugging of faults.

Currently this is a6xx-only, but mostly only because so far it is the
only one using adreno-smmu-priv.

Signed-off-by: Rob Clark <[email protected]>
Acked-by: Jordan Crouse <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Clark <[email protected]>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index fdc5851355af..ef41ec09f59c 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -71,6 +71,15 @@ struct msm_gpu_funcs {
 	uint32_t (*get_rptr)(struct msm_gpu *gpu, struct msm_ringbuffer *ring);
 };
 
+/* Additional state for iommu faults: */
+struct msm_gpu_fault_info {
+	u64 ttbr0;
+	unsigned long iova;
+	int flags;
+	const char *type;
+	const char *block;
+};
+
 struct msm_gpu {
 	const char *name;
 	struct drm_device *dev;
@@ -125,6 +134,12 @@ struct msm_gpu {
 #define DRM_MSM_HANGCHECK_DEFAULT_PERIOD 500 /* in ms */
 	struct timer_list hangcheck_timer;
 
+	/* Fault info for most recent iova fault: */
+	struct msm_gpu_fault_info fault_info;
+
+	/* work for handling GPU ioval faults: */
+	struct kthread_work fault_work;
+
 	/* work for handling GPU recovery: */
 	struct kthread_work recover_work;
 
@@ -232,6 +247,8 @@ struct msm_gpu_state {
 	char *comm;
 	char *cmd;
 
+	struct msm_gpu_fault_info fault_info;
+
 	int nr_bos;
 	struct msm_gpu_state_bo *bos;
 };