evl: latency instrumentation

1) Tipical information screen in single run mode. In this scenario, the DUT running linux was originally idle (hence the high number of hits at ~30usec); then started executing hackbench [1] to load the scheduler [1] https://github.com/linux-test-project/ltp * Example for time bounded test ======================= Interrupt Latency tester Max samples: 20000 ========================= Select test (default t) * : run until latency hit ~ : run for ever t : time bounded : t Max latency that will stop the test [usec, default 80] : 50 Enter period [default 5 msec]: Enter calibrated latency [default 2500 nsec]: - test duration until latency hits 50000 - period 5000 usec - calibrated latency 2500 ns Test will capture 2000 samples Press any key to begin Histogram bin size in usec [min 1, default 5]: Total number of samples: 1994 ------- latency ----- -- nbr -- ---------------- chart ---------------------- [0000000 - 0025791 ns] 0004 | [0025791 - 0030791 ns] 0896 -------------------------------------------------| [0030791 - 0035791 ns] 0019 -| [0035791 - 0040791 ns] 0001 | [0040791 - 0045791 ns] 0000 [0045791 - 0050791 ns] 0008 | [0050791 - 0055791 ns] 0009 | [0055791 - 0060791 ns] 0016 | [0060791 - 0065791 ns] 0028 -| [0065791 - 0070791 ns] 0010 | [0070791 - 0075791 ns] 0009 | [0075791 - 0080791 ns] 0004 | [0080791 - 0085791 ns] 0007 | [0085791 - 0090791 ns] 0024 -| [0090791 - 0095791 ns] 0115 ------| [0095791 - 0100791 ns] 0320 -----------------| [0100791 - 0105791 ns] 0299 ----------------| [0105791 - 0110791 ns] 0134 -------| [0110791 - 0115791 ns] 0067 ---| [0115791 - 0120791 ns] 0014 | [0120791 - 0125791 ns] 0009 | [0125791 - 0126416 ns] 0001 | Latency limits: ------------------------- min[0241] = 0025791 nsec at 1205 msec max[1248] = 0126416 nsec at 6240 msec test duration: 10000 msec 2) In continuous mode, the user can run * until a user programmable max latency is hit. At that point the test stops and the histogram and sample history is presented. *until the user-space code that responds to the Zephyr device requests is halted (so the user needs to stop it). At that point the histogram and the statistics are presented. * Example of continuous mode: ======================= Interrupt Latency tester Max samples: 20000 ========================= Select test (default t) * : run until latency hit ~ : run for ever t : time bounded : ~ Enter period [default 1 msec]: Enter calibrated latency [default 1000 nsec]: - test duration unbounded - period 1000 usec - calibrated latency 1000 ns Press any key to begin max latency hit : 51708 nsec max latency hit : 57791 nsec max latency hit : 58541 nsec max latency hit : 59791 nsec max latency hit : 63166 nsec max latency hit : 63875 nsec max latency hit : 64541 nsec max latency hit : 66541 nsec max latency hit : 79375 nsec max latency hit : 89583 nsec Latency test: nsamples : 83577603 max latency : 89583 nsec min latency : 16133 nsec overflows : 0000 ------- latency --------- -- nbr -- ---------------- chart ---------------------- [0000000 - 0000000 ns] 0000 [0000000 - 0010000 ns] 0000 [0010000 - 0020000 ns] 1887557 -| [0020000 - 0030000 ns] 73650118 -------------------| [0030000 - 0040000 ns] 6475034 ----| [0040000 - 0050000 ns] 178122 | [0050000 - 0060000 ns] 3430 | [0060000 - 0070000 ns] 0066 | [0070000 - 0080000 ns] 0003 | [0080000 - 0090000 ns] 0001 | [0090000 - 0100000 ns] 0000 [0100000 - 0110000 ns] 0000 [0110000 - 0120000 ns] 0000 [0120000 - 0130000 ns] 0000 [0130000 - 0140000 ns] 0000 [0140000 - 0150000 ns] 0000 [0150000 - 0160000 ns] 0000 [0160000 - 0170000 ns] 0000 [0170000 - 0180000 ns] 0000 [0180000 - 0190000 ns] 0000 [0190000 - max] 0000
ldts · Jul 1, 2019 · 312fc19 · 312fc19
1 parent e9ed634
commit 312fc19
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diff --git a/boards/arm/frdm_k64f/frdm_k64f.dts b/boards/arm/frdm_k64f/frdm_k64f.dts
@@ -36,6 +36,8 @@
 		sw0 = &user_button_3;
 		sw1 = &user_button_2;
 		eth = &eth;
+		tx = &transmit_gpio;
+		rx = &receive_gpio;
 	};
 
 	chosen {
@@ -49,30 +51,46 @@
 
 	leds {
 		compatible = "gpio-leds";
+
 		red_led: led_0 {
 			gpios = <&gpiob 22 0>;
 			label = "User LD1";
 		};
+
 		green_led: led_1 {
 			gpios = <&gpioe 26 0>;
 			label = "User LD2";
 		};
+
 		blue_led: led_2 {
 			gpios = <&gpiob 21 0>;
 			label = "User LD3";
 		};
+
+		transmit_gpio: transmit {
+			gpios = <&gpioe 24 0>;
+			label = "To DUT";
+		};
 	};
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button_2: button_0 {
 			label = "User SW2";
 			gpios = <&gpioc 6 GPIO_INT_ACTIVE_LOW>;
 		};
+
 		user_button_3: button_1 {
 			label = "User SW3";
 			gpios = <&gpioa 4 GPIO_INT_ACTIVE_LOW>;
 		};
+
+		receive_gpio: receive {
+			label = "From DUT";
+			gpios = <&gpioe 25 GPIO_INT_ACTIVE_HIGH>;
+		};
+
 	};
 };
 

diff --git a/boards/arm/frdm_k64f/pinmux.c b/boards/arm/frdm_k64f/pinmux.c
@@ -108,6 +108,9 @@ static int frdm_k64f_pinmux_init(struct device *dev)
 					| PORT_PCR_ODE_MASK);
 	pinmux_pin_set(porte, 25, PORT_PCR_MUX(kPORT_MuxAlt5)
 					| PORT_PCR_ODE_MASK);
+#else
+	pinmux_pin_set(porte, 24, PORT_PCR_MUX(kPORT_MuxAsGpio));
+	pinmux_pin_set(porte, 25, PORT_PCR_MUX(kPORT_MuxAsGpio));
 #endif
 
 #if CONFIG_ADC_1

diff --git a/samples/drivers/gpio_latency/CMakeLists.txt b/samples/drivers/gpio_latency/CMakeLists.txt
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(gpio_latency)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})
diff --git a/samples/drivers/gpio_latency/prj.conf b/samples/drivers/gpio_latency/prj.conf
@@ -0,0 +1,5 @@
+CONFIG_LOG=y
+CONFIG_GPIO=y
+CONFIG_TICKLESS_KERNEL=y
+CONFIG_CONSOLE_SUBSYS=y
+CONFIG_CONSOLE_GETLINE=y
diff --git a/samples/drivers/gpio_latency/sample.yaml b/samples/drivers/gpio_latency/sample.yaml
@@ -0,0 +1,11 @@
+sample:
+  name: GPIO Latency instrumentation tool
+tests:
+  sample.driver.gpio_latency:
+    tags: drivers
+    harness: console
+    harness_config:
+        type: one_line
+        regex:
+            - "Toggling (.*)"
+    depends_on: gpio