drm/xe: Add trace to lrc timestamp update

Help debugging when LRC timestamp is updated for a exec queue.

Reviewed-by: Jonathan Cavitt <[e-mail]>
Reviewed-by: Nirmoy Das <[e-mail]>
Reviewed-by: Umesh Nerlige Ramappa <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Lucas De Marchi <[e-mail]>

drivers/gpu/drm/xe/Makefile

···
 	xe_trace.o \
 	xe_trace_bo.o \
 	xe_trace_guc.o \
+	xe_trace_lrc.o \
 	xe_ttm_sys_mgr.o \
 	xe_ttm_stolen_mgr.o \
 	xe_ttm_vram_mgr.o \

drivers/gpu/drm/xe/xe_lrc.c

···
 #include "xe_map.h"
 #include "xe_memirq.h"
 #include "xe_sriov.h"
+#include "xe_trace_lrc.h"
 #include "xe_vm.h"
 #include "xe_wa.h"
 
···
 	*old_ts = lrc->ctx_timestamp;
 
 	lrc->ctx_timestamp = xe_lrc_ctx_timestamp(lrc);
+
+	trace_xe_lrc_update_timestamp(lrc, *old_ts);
 
 	return lrc->ctx_timestamp;
 }

drivers/gpu/drm/xe/xe_trace_lrc.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#ifndef __CHECKER__
+#define CREATE_TRACE_POINTS
+#include "xe_trace_lrc.h"
+#endif

drivers/gpu/drm/xe/xe_trace_lrc.h

···
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM xe
+
+#if !defined(_XE_TRACE_LRC_H_) || defined(TRACE_HEADER_MULTI_READ)
+#define _XE_TRACE_LRC_H_
+
+#include <linux/tracepoint.h>
+#include <linux/types.h>
+
+#include "xe_gt_types.h"
+#include "xe_lrc.h"
+#include "xe_lrc_types.h"
+
+#define __dev_name_lrc(lrc)	dev_name(gt_to_xe((lrc)->fence_ctx.gt)->drm.dev)
+
+TRACE_EVENT(xe_lrc_update_timestamp,
+	    TP_PROTO(struct xe_lrc *lrc, uint32_t old),
+	    TP_ARGS(lrc, old),
+	    TP_STRUCT__entry(
+		     __field(struct xe_lrc *, lrc)
+		     __field(u32, old)
+		     __field(u32, new)
+		     __string(name, lrc->fence_ctx.name)
+		     __string(device_id, __dev_name_lrc(lrc))
+	    ),
+
+	    TP_fast_assign(
+		   __entry->lrc	= lrc;
+		   __entry->old = old;
+		   __entry->new = lrc->ctx_timestamp;
+		   __assign_str(name);
+		   __assign_str(device_id);
+		   ),
+	    TP_printk("lrc=:%p lrc->name=%s old=%u new=%u device_id:%s",
+		      __entry->lrc, __get_str(name),
+		      __entry->old, __entry->new,
+		      __get_str(device_id))
+);
+
+#endif
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_PATH ../../drivers/gpu/drm/xe
+#define TRACE_INCLUDE_FILE xe_trace_lrc
+#include <trace/define_trace.h>