drm/xe: Add infrastructure for delayed LRC capture

Add a xe_guc_exec_queue_snapshot_capture_delayed and
xe_lrc_snapshot_capture_delayed function to capture
the contents of LRC in the next patch.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240227131248.92910-2-maarten.lankhorst@linux.intel.com

drivers/gpu/drm/xe/xe_devcoredump.c

@@ -65,8 +65,8 @@ static void xe_devcoredump_deferred_snap_work(struct work_struct *work)
 	struct xe_devcoredump_snapshot *ss = container_of(work, typeof(*ss), work);
 
 	xe_force_wake_get(gt_to_fw(ss->gt), XE_FORCEWAKE_ALL);
-	if (ss->vm)
-		xe_vm_snapshot_capture_delayed(ss->vm);
+	xe_vm_snapshot_capture_delayed(ss->vm);
+	xe_guc_exec_queue_snapshot_capture_delayed(ss->ge);
 	xe_force_wake_put(gt_to_fw(ss->gt), XE_FORCEWAKE_ALL);
 }
 
@@ -196,8 +196,7 @@ static void devcoredump_snapshot(struct xe_devcoredump *coredump,
 		coredump->snapshot.hwe[id] = xe_hw_engine_snapshot_capture(hwe);
 	}
 
-	if (ss->vm)
-		queue_work(system_unbound_wq, &ss->work);
+	queue_work(system_unbound_wq, &ss->work);
 
 	xe_force_wake_put(gt_to_fw(q->gt), XE_FORCEWAKE_ALL);
 	dma_fence_end_signalling(cookie);

drivers/gpu/drm/xe/xe_guc_submit.c

@@ -1865,6 +1865,24 @@ xe_guc_exec_queue_snapshot_capture(struct xe_sched_job *job)
 	return snapshot;
 }
 
+/**
+ * xe_guc_exec_queue_snapshot_capture_delayed - Take delayed part of snapshot of the GuC Engine.
+ * @snapshot: Previously captured snapshot of job.
+ *
+ * This captures some data that requires taking some locks, so it cannot be done in signaling path.
+ */
+void
+xe_guc_exec_queue_snapshot_capture_delayed(struct xe_guc_submit_exec_queue_snapshot *snapshot)
+{
+	int i;
+
+	if (!snapshot || !snapshot->lrc)
+		return;
+
+	for (i = 0; i < snapshot->width; ++i)
+		xe_lrc_snapshot_capture_delayed(snapshot->lrc[i]);
+}
+
 /**
  * xe_guc_exec_queue_snapshot_print - Print out a given GuC Engine snapshot.
  * @snapshot: GuC Submit Engine snapshot object.

drivers/gpu/drm/xe/xe_guc_submit.h

@@ -29,6 +29,8 @@ int xe_guc_exec_queue_reset_failure_handler(struct xe_guc *guc, u32 *msg, u32 le
 struct xe_guc_submit_exec_queue_snapshot *
 xe_guc_exec_queue_snapshot_capture(struct xe_sched_job *job);
 void
+xe_guc_exec_queue_snapshot_capture_delayed(struct xe_guc_submit_exec_queue_snapshot *snapshot);
+void
 xe_guc_exec_queue_snapshot_print(struct xe_guc_submit_exec_queue_snapshot *snapshot,
 				 struct drm_printer *p);
 void

drivers/gpu/drm/xe/xe_lrc.c

@@ -1359,6 +1359,14 @@ struct xe_lrc_snapshot *xe_lrc_snapshot_capture(struct xe_lrc *lrc)
 	return snapshot;
 }
 
+void xe_lrc_snapshot_capture_delayed(struct xe_lrc_snapshot *snapshot)
+{
+	if (!snapshot)
+		return;
+
+	/* TODO: Copy status page */
+}
+
 void xe_lrc_snapshot_print(struct xe_lrc_snapshot *snapshot, struct drm_printer *p)
 {
 	if (!snapshot)

drivers/gpu/drm/xe/xe_lrc.h

@@ -56,6 +56,7 @@ void xe_lrc_dump_default(struct drm_printer *p,
 void xe_lrc_emit_hwe_state_instructions(struct xe_exec_queue *q, struct xe_bb *bb);
 
 struct xe_lrc_snapshot *xe_lrc_snapshot_capture(struct xe_lrc *lrc);
+void xe_lrc_snapshot_capture_delayed(struct xe_lrc_snapshot *snapshot);
 void xe_lrc_snapshot_print(struct xe_lrc_snapshot *snapshot, struct drm_printer *p);
 void xe_lrc_snapshot_free(struct xe_lrc_snapshot *snapshot);
 

drivers/gpu/drm/xe/xe_vm.c

@@ -3377,6 +3377,9 @@ struct xe_vm_snapshot *xe_vm_snapshot_capture(struct xe_vm *vm)
 
 void xe_vm_snapshot_capture_delayed(struct xe_vm_snapshot *snap)
 {
+	if (!snap)
+		return;
+
 	for (int i = 0; i < snap->num_snaps; i++) {
 		struct xe_bo *bo = snap->snap[i].bo;
 		struct iosys_map src;