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
