[PATCH umr] Add demo external app

[Tom St Denis]

This commit adds the first external app demo.  In this case
a fan controller based on reading the GPU_TEMP sensor.

It has a hard coded pwm path and instance which can be changed later.

You have to "make install" umr first then you can build this
with "make".

Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
 demo/vega10_pwm/Makefile |   6 +++
 demo/vega10_pwm/main.c   | 119 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 125 insertions(+)
 create mode 100644 demo/vega10_pwm/Makefile
 create mode 100644 demo/vega10_pwm/main.c

diff --git a/demo/vega10_pwm/Makefile b/demo/vega10_pwm/Makefile
new file mode 100644
index 000000000000..9ae40e2fbb14
--- /dev/null
+++ b/demo/vega10_pwm/Makefile
@@ -0,0 +1,6 @@
+vega10_pwm: main.o
+	${CC} main.o -lumrcore -lpciaccess -o vega10_pwm
+
+.PHONY: clean
+clean:
+	rm -f main.o vega10_pwm
diff --git a/demo/vega10_pwm/main.c b/demo/vega10_pwm/main.c
new file mode 100644
index 000000000000..4e376d5b864e
--- /dev/null
+++ b/demo/vega10_pwm/main.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright 2017 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Tom St Denis <tom.stdenis at amd.com>
+ *
+ */
+
+/* Simple demo application to show off linking in umr externally
+ *
+ * In this demo we control the PWM of the Vega10 fan and read the GPU_TEMP
+ * sensor to try and regulate temp by throttling the fan speed.
+ *
+ * This is merely a demo as the Vega10 firmware will handle throttling
+ * the temp in normal operation.
+ *
+ * (note: If you run this it will put the pwm in manual mode so if you
+ *        exit the program with the PWM set to low it will stay there)
+ */
+
+#include <umr.h>
+#include <time.h>
+
+// path to PWM controller 
+static char pwmname[] =
+	"/sys/devices/pci0000:00/0000:00:03.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/hwmon/hwmon1/pwm1";
+
+static struct umr_options options;
+static struct umr_asic *asic;
+static uint32_t pwm = 32;
+
+uint32_t read_temp(void)
+{
+	uint32_t value;
+	int size;
+
+	// read temp
+	size  = sizeof value;
+	umr_read_sensor(asic, AMDGPU_PP_SENSOR_GPU_TEMP, &value, &size);
+	return value / 1000;
+}
+
+void set_pwm(void)
+{
+	FILE *f;
+	f = fopen(pwmname, "w");
+	fprintf(f, "%lu\n", (unsigned long)pwm);
+	fclose(f);
+}
+
+void up_pwm(uint32_t x)
+{
+	pwm += x;
+	if (pwm >= 256) pwm = 255;  // cap at 255
+	set_pwm();
+}
+
+void down_pwm(uint32_t x)
+{
+	pwm -= x;
+	if (--pwm < 32) pwm = 32;   // don't turn full off ever
+	set_pwm();
+}
+
+int main(void)
+{
+	uint32_t temp;
+	struct timespec ts;
+	
+	// find our asic
+	memset(&options, 0, sizeof options);
+	options.instance = 1;
+	asic = umr_discover_asic(&options);
+	if (!asic || asic->family != FAMILY_AI) {
+		fprintf(stderr, "[ERROR]: Could not find AI class device\n");
+		exit(EXIT_FAILURE);
+	}
+
+	ts.tv_nsec = (1000000000 / 1000) * 250;
+	ts.tv_sec = 0;
+	for (;;) {
+		temp = read_temp();
+		if (temp > 65) {                      // core is getting really hot ramp up pwm quickly
+			up_pwm(8);
+		} else if (temp > 60 && pwm < 192) {  // a bit toasty ramp up slower but don't go max speed at this point
+			up_pwm(4);
+		} else if (temp > 45 && pwm < 64) {   // fine temp no need to get crazy
+			up_pwm(1);
+		} else if (temp < 35) {               // core is fully idle ramp down quickish
+			down_pwm(4);
+		} else {               // core is below a semi-busy state so ramp down slowly
+			down_pwm(1);
+		}
+		printf("temp %3lu C, fan %3lu %% \r", temp, (pwm * 100) / 256);
+		fflush(stdout);
+		nanosleep(&ts, NULL);
+	}
+
+
+	return 0;
+}
+
-- 
2.12.0