drm/xe: Add GuC CT snapshot to xe_devcoredump.

Let's start to move our existent logs to devcoredump one by
one. Any format change should come on follow-up work.

v2: Rebase and add the dma_fence locking annotation here.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>

drivers/gpu/drm/xe/xe_devcoredump.c

@@ -11,6 +11,7 @@
 
 #include "xe_engine.h"
 #include "xe_gt.h"
+#include "xe_guc_ct.h"
 
 /**
  * DOC: Xe device coredump
@@ -48,6 +49,11 @@ static struct xe_device *coredump_to_xe(const struct xe_devcoredump *coredump)
 	return container_of(coredump, struct xe_device, devcoredump);
 }
 
+static struct xe_guc *engine_to_guc(struct xe_engine *e)
+{
+	return &e->gt->uc.guc;
+}
+
 static ssize_t xe_devcoredump_read(char *buffer, loff_t offset,
 				   size_t count, void *data, size_t datalen)
 {
@@ -78,6 +84,9 @@ static ssize_t xe_devcoredump_read(char *buffer, loff_t offset,
 	ts = ktime_to_timespec64(ss->boot_time);
 	drm_printf(&p, "Uptime: %lld.%09ld\n", ts.tv_sec, ts.tv_nsec);
 
+	drm_printf(&p, "\n**** GuC CT ****\n");
+	xe_guc_ct_snapshot_print(coredump->snapshot.ct, &p);
+
 	return count - iter.remain;
 }
 
@@ -89,6 +98,8 @@ static void xe_devcoredump_free(void *data)
 	if (!data || !coredump_to_xe(coredump))
 		return;
 
+	xe_guc_ct_snapshot_free(coredump->snapshot.ct);
+
 	coredump->captured = false;
 	drm_info(&coredump_to_xe(coredump)->drm,
 		 "Xe device coredump has been deleted.\n");
@@ -98,9 +109,15 @@ static void devcoredump_snapshot(struct xe_devcoredump *coredump,
 				 struct xe_engine *e)
 {
 	struct xe_devcoredump_snapshot *ss = &coredump->snapshot;
+	struct xe_guc *guc = engine_to_guc(e);
+	bool cookie;
 
 	ss->snapshot_time = ktime_get_real();
 	ss->boot_time = ktime_get_boottime();
+
+	cookie = dma_fence_begin_signalling();
+	coredump->snapshot.ct = xe_guc_ct_snapshot_capture(&guc->ct, true);
+	dma_fence_end_signalling(cookie);
 }
 
 /**

drivers/gpu/drm/xe/xe_devcoredump_types.h

@@ -23,6 +23,10 @@ struct xe_devcoredump_snapshot {
 	ktime_t snapshot_time;
 	/** @boot_time:  Relative boot time so the uptime can be calculated. */
 	ktime_t boot_time;
+
+	/* GuC snapshots */
+	/** @ct_snapshot: GuC CT snapshot */
+	struct xe_guc_ct_snapshot *ct;
 };
 
 /**