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Subject[PATCH] Add power/gpu_frequency tracepoint.
From
Historically there is no common trace event for GPU frequency, in
downstream Android each different hardware vendor implements their own
way to expose GPU frequency, for example as a debugfs node. This patch
standardize it as a common trace event in upstream linux kernel to help
the ecosystem have a common implementation across hardware vendors.
Toolings in the Linux ecosystem will benefit from this especially in the
downstream Android, where this information is critical to graphics
developers.

Signed-off-by: Peiyong Lin <lpy@google.com>
---
drivers/gpu/Makefile | 1 +
drivers/gpu/trace/Kconfig | 3 +++
drivers/gpu/trace/Makefile | 1 +
drivers/gpu/trace/trace_gpu_frequency.c | 13 +++++++++++++
include/trace/events/power.h | 26 +++++++++++++++++++++++++
5 files changed, 44 insertions(+)
create mode 100644 drivers/gpu/trace/trace_gpu_frequency.c

diff --git a/drivers/gpu/Makefile b/drivers/gpu/Makefile
index 835c88318cec..f289a47eb031 100644
--- a/drivers/gpu/Makefile
+++ b/drivers/gpu/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_TEGRA_HOST1X) += host1x/
obj-y += drm/ vga/
obj-$(CONFIG_IMX_IPUV3_CORE) += ipu-v3/
obj-$(CONFIG_TRACE_GPU_MEM) += trace/
+obj-$(CONFIG_TRACE_GPU_FREQUENCY) += trace/
diff --git a/drivers/gpu/trace/Kconfig b/drivers/gpu/trace/Kconfig
index c24e9edd022e..ac4aec8d5845 100644
--- a/drivers/gpu/trace/Kconfig
+++ b/drivers/gpu/trace/Kconfig
@@ -2,3 +2,6 @@

config TRACE_GPU_MEM
bool
+
+config TRACE_GPU_FREQUENCY
+ bool
diff --git a/drivers/gpu/trace/Makefile b/drivers/gpu/trace/Makefile
index b70fbdc5847f..2b7ae69327d6 100644
--- a/drivers/gpu/trace/Makefile
+++ b/drivers/gpu/trace/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0

obj-$(CONFIG_TRACE_GPU_MEM) += trace_gpu_mem.o
+obj-$(CONFIG_TRACE_GPU_FREQUENCY) += trace_gpu_frequency.o
diff --git a/drivers/gpu/trace/trace_gpu_frequency.c b/drivers/gpu/trace/trace_gpu_frequency.c
new file mode 100644
index 000000000000..f5af5800b52d
--- /dev/null
+++ b/drivers/gpu/trace/trace_gpu_frequency.c
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * GPU frequency trace points
+ *
+ * Copyright (C) 2020 Google, Inc.
+ */
+
+#include <linux/module.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/power.h>
+
+EXPORT_TRACEPOINT_SYMBOL(gpu_frequency);
diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index af5018aa9517..befc0157131e 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -500,6 +500,32 @@ DEFINE_EVENT(dev_pm_qos_request, dev_pm_qos_remove_request,

TP_ARGS(name, type, new_value)
);
+
+/**
+ * gpu_frequency - Reports frequency changes in GPU clock domains
+ * @state: New frequency (in KHz)
+ * @gpu_id: GPU clock domain
+ */
+TRACE_EVENT(gpu_frequency,
+
+ TP_PROTO(unsigned int state, unsigned int gpu_id),
+
+ TP_ARGS(state, gpu_id),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, state)
+ __field(unsigned int, gpu_id)
+ ),
+
+ TP_fast_assign(
+ __entry->state = state;
+ __entry->gpu_id = gpu_id;
+ ),
+
+ TP_printk("state=%lu gpu_id=%lu",
+ (unsigned long)__entry->state,
+ (unsigned long)__entry->gpu_id)
+);
#endif /* _TRACE_POWER_H */

/* This part must be outside protection */
--
2.28.0.220.ged08abb693-goog
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