tools/counter: Create Counter tools (08609989) · Commits · EulixOS / Software / Kernel

MAINTAINERS

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		@@ -4805,6 +4805,7 @@ F: Documentation/driver-api/generic-counter.rst
		F: drivers/counter/
		F: include/linux/counter.h
		F: include/uapi/linux/counter.h
		F: tools/counter/

		CP2615 I2C DRIVER
		M: Bence Csókás <bence98@sch.bme.hu>

tools/Makefile

+7 −6

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		@@ -12,6 +12,7 @@ help:
		@echo ' acpi - ACPI tools'
		@echo ' bpf - misc BPF tools'
		@echo ' cgroup - cgroup tools'
		@echo ' counter - counter tools'
		@echo ' cpupower - a tool for all things x86 CPU power'
		@echo ' debugging - tools for debugging'
		@echo ' firewire - the userspace part of nosy, an IEEE-1394 traffic sniffer'
		@@ -65,7 +66,7 @@ acpi: FORCE
		cpupower: FORCE
		$(call descend,power/$@)

		cgroup firewire hv guest bootconfig spi usb virtio vm bpf iio gpio objtool leds wmi pci firmware debugging tracing: FORCE
		cgroup counter firewire hv guest bootconfig spi usb virtio vm bpf iio gpio objtool leds wmi pci firmware debugging tracing: FORCE
		$(call descend,$@)

		bpf/%: FORCE
		@@ -100,7 +101,7 @@ freefall: FORCE
		kvm_stat: FORCE
		$(call descend,kvm/$@)

		all: acpi cgroup cpupower gpio hv firewire liblockdep \
		all: acpi cgroup counter cpupower gpio hv firewire liblockdep \
		perf selftests bootconfig spi turbostat usb \
		virtio vm bpf x86_energy_perf_policy \
		tmon freefall iio objtool kvm_stat wmi \
		@@ -112,7 +113,7 @@ acpi_install:
		cpupower_install:
		$(call descend,power/$(@:_install=),install)

		cgroup_install firewire_install gpio_install hv_install iio_install perf_install bootconfig_install spi_install usb_install virtio_install vm_install bpf_install objtool_install wmi_install pci_install debugging_install tracing_install:
		cgroup_install counter_install firewire_install gpio_install hv_install iio_install perf_install bootconfig_install spi_install usb_install virtio_install vm_install bpf_install objtool_install wmi_install pci_install debugging_install tracing_install:
		$(call descend,$(@:_install=),install)

		liblockdep_install:
		@@ -133,7 +134,7 @@ freefall_install:
		kvm_stat_install:
		$(call descend,kvm/$(@:_install=),install)

		install: acpi_install cgroup_install cpupower_install gpio_install \
		install: acpi_install cgroup_install counter_install cpupower_install gpio_install \
		hv_install firewire_install iio_install liblockdep_install \
		perf_install selftests_install turbostat_install usb_install \
		virtio_install vm_install bpf_install x86_energy_perf_policy_install \
		@@ -147,7 +148,7 @@ acpi_clean:
		cpupower_clean:
		$(call descend,power/cpupower,clean)

		cgroup_clean hv_clean firewire_clean bootconfig_clean spi_clean usb_clean virtio_clean vm_clean wmi_clean bpf_clean iio_clean gpio_clean objtool_clean leds_clean pci_clean firmware_clean debugging_clean tracing_clean:
		cgroup_clean counter_clean hv_clean firewire_clean bootconfig_clean spi_clean usb_clean virtio_clean vm_clean wmi_clean bpf_clean iio_clean gpio_clean objtool_clean leds_clean pci_clean firmware_clean debugging_clean tracing_clean:
		$(call descend,$(@:_clean=),clean)

		liblockdep_clean:
		@@ -181,7 +182,7 @@ freefall_clean:
		build_clean:
		$(call descend,build,clean)

		clean: acpi_clean cgroup_clean cpupower_clean hv_clean firewire_clean \
		clean: acpi_clean cgroup_clean counter_clean cpupower_clean hv_clean firewire_clean \
		perf_clean selftests_clean turbostat_clean bootconfig_clean spi_clean usb_clean virtio_clean \
		vm_clean bpf_clean iio_clean x86_energy_perf_policy_clean tmon_clean \
		freefall_clean build_clean libbpf_clean libsubcmd_clean liblockdep_clean \

tools/counter/Build

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		counter_example-y += counter_example.o

tools/counter/Makefile

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		# SPDX-License-Identifier: GPL-2.0
		include ../scripts/Makefile.include

		bindir ?= /usr/bin

		ifeq ($(srctree),)
		srctree := $(patsubst %/,%,$(dir $(CURDIR)))
		srctree := $(patsubst %/,%,$(dir $(srctree)))
		endif

		# Do not use make's built-in rules
		# (this improves performance and avoids hard-to-debug behaviour);
		MAKEFLAGS += -r

		override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include

		ALL_TARGETS := counter_example
		ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS))

		all: $(ALL_PROGRAMS)

		export srctree OUTPUT CC LD CFLAGS
		include $(srctree)/tools/build/Makefile.include

		#
		# We need the following to be outside of kernel tree
		#
		$(OUTPUT)include/linux/counter.h: ../../include/uapi/linux/counter.h
		mkdir -p $(OUTPUT)include/linux 2>&1 \|\| true
		ln -sf $(CURDIR)/../../include/uapi/linux/counter.h $@

		prepare: $(OUTPUT)include/linux/counter.h

		COUNTER_EXAMPLE := $(OUTPUT)counter_example.o
		$(COUNTER_EXAMPLE): prepare FORCE
		$(Q)$(MAKE) $(build)=counter_example
		$(OUTPUT)counter_example: $(COUNTER_EXAMPLE)
		$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@

		clean:
		rm -f $(ALL_PROGRAMS)
		rm -rf $(OUTPUT)include/linux/counter.h
		find $(if $(OUTPUT),$(OUTPUT),.) -name '.o' -delete -o -name '\..d' -delete

		install: $(ALL_PROGRAMS)
		install -d -m 755 $(DESTDIR)$(bindir); \
		for program in $(ALL_PROGRAMS); do \
		install $$program $(DESTDIR)$(bindir); \
		done

		FORCE:

		.PHONY: all install clean FORCE prepare

tools/counter/counter_example.c

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		// SPDX-License-Identifier: GPL-2.0-only
		/* Counter - example userspace application
		*
		* The userspace application opens /dev/counter0, configures the
		* COUNTER_EVENT_INDEX event channel 0 to gather Count 0 count and Count
		* 1 count, and prints out the data as it becomes available on the
		* character device node.
		*
		* Copyright (C) 2021 William Breathitt Gray
		*/
		#include <errno.h>
		#include <fcntl.h>
		#include <linux/counter.h>
		#include <stdio.h>
		#include <string.h>
		#include <sys/ioctl.h>
		#include <unistd.h>

		static struct counter_watch watches[2] = {
		{
		/* Component data: Count 0 count */
		.component.type = COUNTER_COMPONENT_COUNT,
		.component.scope = COUNTER_SCOPE_COUNT,
		.component.parent = 0,
		/* Event type: Index */
		.event = COUNTER_EVENT_INDEX,
		/* Device event channel 0 */
		.channel = 0,
		},
		{
		/* Component data: Count 1 count */
		.component.type = COUNTER_COMPONENT_COUNT,
		.component.scope = COUNTER_SCOPE_COUNT,
		.component.parent = 1,
		/* Event type: Index */
		.event = COUNTER_EVENT_INDEX,
		/* Device event channel 0 */
		.channel = 0,
		},
		};

		int main(void)
		{
		int fd;
		int ret;
		int i;
		struct counter_event event_data[2];

		fd = open("/dev/counter0", O_RDWR);
		if (fd == -1) {
		perror("Unable to open /dev/counter0");
		return 1;
		}

		for (i = 0; i < 2; i++) {
		ret = ioctl(fd, COUNTER_ADD_WATCH_IOCTL, watches + i);
		if (ret == -1) {
		fprintf(stderr, "Error adding watches[%d]: %s\n", i,
		strerror(errno));
		return 1;
		}
		}
		ret = ioctl(fd, COUNTER_ENABLE_EVENTS_IOCTL);
		if (ret == -1) {
		perror("Error enabling events");
		return 1;
		}

		for (;;) {
		ret = read(fd, event_data, sizeof(event_data));
		if (ret == -1) {
		perror("Failed to read event data");
		return 1;
		}

		if (ret != sizeof(event_data)) {
		fprintf(stderr, "Failed to read event data\n");
		return -EIO;
		}

		printf("Timestamp 0: %llu\tCount 0: %llu\n"
		"Error Message 0: %s\n"
		"Timestamp 1: %llu\tCount 1: %llu\n"
		"Error Message 1: %s\n",
		event_data[0].timestamp, event_data[0].value,
		strerror(event_data[0].status),
		event_data[1].timestamp, event_data[1].value,
		strerror(event_data[1].status));
		}

		return 0;
		}