[PATCH] Add gpu memory tracepoints

[zzyiwei@google.com]

From: Yiwei Zhang <zzyiwei@google.com>

This change adds the below gpu memory tracepoint:
gpu_mem/gpu_mem_total: track global or process gpu memory total counters

Signed-off-by: Yiwei Zhang <zzyiwei@google.com>
---
 include/trace/events/gpu_mem.h | 64 ++++++++++++++++++++++++++++++++++
 kernel/trace/Kconfig           |  3 ++
 kernel/trace/Makefile          |  1 +
 kernel/trace/trace_gpu_mem.c   | 13 +++++++
 4 files changed, 81 insertions(+)
 create mode 100644 include/trace/events/gpu_mem.h
 create mode 100644 kernel/trace/trace_gpu_mem.c

diff --git a/include/trace/events/gpu_mem.h b/include/trace/events/gpu_mem.h
new file mode 100644
index 000000000000..3b632a2b5100
--- /dev/null
+++ b/include/trace/events/gpu_mem.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * GPU memory trace points
+ *
+ * Copyright (C) 2020 Google, Inc.
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM gpu_mem
+
+#if !defined(_TRACE_GPU_MEM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_GPU_MEM_H
+
+#include <linux/tracepoint.h>
+
+/*
+ * The gpu_memory_total event indicates that there's an update to either the
+ * global or process total gpu memory counters.
+ *
+ * This event should be emitted whenever the kernel device driver allocates,
+ * frees, imports, unimports memory in the GPU addressable space.
+ *
+ * @gpu_id: This is the gpu id.
+ *
+ * @pid: Put 0 for global total, while positive pid for process total.
+ *
+ * @size: Virtual size of the allocation in bytes.
+ *
+ */
+TRACE_EVENT(gpu_mem_total,
+	TP_PROTO(
+		uint32_t gpu_id,
+		uint32_t pid,
+		uint64_t size
+	),
+	TP_ARGS(
+		gpu_id,
+		pid,
+		size
+	),
+	TP_STRUCT__entry(
+		__field(uint32_t, gpu_id)
+		__field(uint32_t, pid)
+		__field(uint64_t, size)
+	),
+	TP_fast_assign(
+		__entry->gpu_id = gpu_id;
+		__entry->pid = pid;
+		__entry->size = size;
+	),
+	TP_printk(
+		"gpu_id=%u "
+		"pid=%u "
+		"size=%llu",
+		__entry->gpu_id,
+		__entry->pid,
+		__entry->size
+	)
+);
+
+#endif /* _TRACE_GPU_MEM_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 91e885194dbc..cb404755b0a6 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -85,6 +85,9 @@ config EVENT_TRACING
 config CONTEXT_SWITCH_TRACER
 	bool
 
+config TRACE_GPU_MEM
+	bool
+
 config RING_BUFFER_ALLOW_SWAP
 	bool
 	help
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index f9dcd19165fa..267985313dca 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_PREEMPTIRQ_DELAY_TEST) += preemptirq_delay_test.o
 obj-$(CONFIG_SYNTH_EVENT_GEN_TEST) += synth_event_gen_test.o
 obj-$(CONFIG_KPROBE_EVENT_GEN_TEST) += kprobe_event_gen_test.o
 obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
+obj-$(CONFIG_TRACE_GPU_MEM) += trace_gpu_mem.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
 obj-$(CONFIG_PREEMPTIRQ_TRACEPOINTS) += trace_preemptirq.o
 obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
diff --git a/kernel/trace/trace_gpu_mem.c b/kernel/trace/trace_gpu_mem.c
new file mode 100644
index 000000000000..01e855897b6d
--- /dev/null
+++ b/kernel/trace/trace_gpu_mem.c
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * GPU memory trace points
+ *
+ * Copyright (C) 2020 Google, Inc.
+ */
+
+#include <linux/module.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/gpu_mem.h>
+
+EXPORT_TRACEPOINT_SYMBOL(gpu_mem_total);
-- 
2.25.0.341.g760bfbb309-goog