// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org> */ #define _GNU_SOURCE#include <stdlib.h>#include <string.h>#include <signal.h>#include <unistd.h>#include <stdio.h>#include <time.h>#include <sched.h>#include <pthread.h> #include "timerlat.h"#include "timerlat_aa.h"#include "timerlat_bpf.h"#include "cli.h"#include "common.h" struct timerlat_top_cpu {	unsigned long long	irq_count;	unsigned long long	thread_count;	unsigned long long	user_count; 	unsigned long long	cur_irq;	unsigned long long	min_irq;	unsigned long long	sum_irq;	unsigned long long	max_irq; 	unsigned long long	cur_thread;	unsigned long long	min_thread;	unsigned long long	sum_thread;	unsigned long long	max_thread; 	unsigned long long	cur_user;	unsigned long long	min_user;	unsigned long long	sum_user;	unsigned long long	max_user;}; struct timerlat_top_data {	struct timerlat_top_cpu	*cpu_data;}; /* * timerlat_free_top - free runtime data */static void timerlat_free_top(struct timerlat_top_data *data){	free(data->cpu_data);	free(data);} static void timerlat_free_top_tool(struct osnoise_tool *tool){	timerlat_free_top(tool->data);	timerlat_free(tool);} /* * timerlat_alloc_histogram - alloc runtime data */static struct timerlat_top_data *timerlat_alloc_top(void){	struct timerlat_top_data *data;	int cpu; 	data = calloc(1, sizeof(*data));	if (!data)		return NULL; 	/* one set of histograms per CPU */	data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus);	if (!data->cpu_data)		goto cleanup; 	/* set the min to max */	for (cpu = 0; cpu < nr_cpus; cpu++) {		data->cpu_data[cpu].min_irq = ~0;		data->cpu_data[cpu].min_thread = ~0;		data->cpu_data[cpu].min_user = ~0;	} 	return data; cleanup:	timerlat_free_top(data);	return NULL;} static voidtimerlat_top_reset_sum(struct timerlat_top_cpu *summary){	memset(summary, 0, sizeof(*summary));	summary->min_irq = ~0;	summary->min_thread = ~0;	summary->min_user = ~0;} static voidtimerlat_top_update_sum(struct osnoise_tool *tool, int cpu, struct timerlat_top_cpu *sum){	struct timerlat_top_data *data = tool->data;	struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu]; 	sum->irq_count += cpu_data->irq_count;	update_min(&sum->min_irq, &cpu_data->min_irq);	update_sum(&sum->sum_irq, &cpu_data->sum_irq);	update_max(&sum->max_irq, &cpu_data->max_irq); 	sum->thread_count += cpu_data->thread_count;	update_min(&sum->min_thread, &cpu_data->min_thread);	update_sum(&sum->sum_thread, &cpu_data->sum_thread);	update_max(&sum->max_thread, &cpu_data->max_thread); 	sum->user_count += cpu_data->user_count;	update_min(&sum->min_user, &cpu_data->min_user);	update_sum(&sum->sum_user, &cpu_data->sum_user);	update_max(&sum->max_user, &cpu_data->max_user);} /* * timerlat_hist_update - record a new timerlat occurent on cpu, updating data */static voidtimerlat_top_update(struct osnoise_tool *tool, int cpu,		    unsigned long long thread,		    unsigned long long latency){	struct timerlat_params *params = to_timerlat_params(tool->params);	struct timerlat_top_data *data = tool->data;	struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu]; 	if (params->common.output_divisor)		latency = latency / params->common.output_divisor; 	if (!thread) {		cpu_data->irq_count++;		cpu_data->cur_irq = latency;		update_min(&cpu_data->min_irq, &latency);		update_sum(&cpu_data->sum_irq, &latency);		update_max(&cpu_data->max_irq, &latency);	} else if (thread == 1) {		cpu_data->thread_count++;		cpu_data->cur_thread = latency;		update_min(&cpu_data->min_thread, &latency);		update_sum(&cpu_data->sum_thread, &latency);		update_max(&cpu_data->max_thread, &latency);	} else {		cpu_data->user_count++;		cpu_data->cur_user = latency;		update_min(&cpu_data->min_user, &latency);		update_sum(&cpu_data->sum_user, &latency);		update_max(&cpu_data->max_user, &latency);	}} /* * timerlat_top_handler - this is the handler for timerlat tracer events */static inttimerlat_top_handler(struct trace_seq *s, struct tep_record *record,		     struct tep_event *event, void *context){	struct trace_instance *trace = context;	unsigned long long latency, thread;	struct osnoise_tool *top;	int cpu = record->cpu; 	top = container_of(trace, struct osnoise_tool, trace); 	if (!top->params->aa_only) {		tep_get_field_val(s, event, "context", record, &thread, 1);		tep_get_field_val(s, event, "timer_latency", record, &latency, 1); 		timerlat_top_update(top, cpu, thread, latency);	} 	return 0;} /* * timerlat_top_bpf_pull_data - copy data from BPF maps into userspace */static int timerlat_top_bpf_pull_data(struct osnoise_tool *tool){	struct timerlat_top_data *data = tool->data;	int i, err;	long long value_irq[nr_cpus],		  value_thread[nr_cpus],		  value_user[nr_cpus]; 	/* Pull summary */	err = timerlat_bpf_get_summary_value(SUMMARY_CURRENT,					     value_irq, value_thread, value_user);	if (err)		return err;	for (i = 0; i < nr_cpus; i++) {		data->cpu_data[i].cur_irq = value_irq[i];		data->cpu_data[i].cur_thread = value_thread[i];		data->cpu_data[i].cur_user = value_user[i];	} 	err = timerlat_bpf_get_summary_value(SUMMARY_COUNT,					     value_irq, value_thread, value_user);	if (err)		return err;	for (i = 0; i < nr_cpus; i++) {		data->cpu_data[i].irq_count = value_irq[i];		data->cpu_data[i].thread_count = value_thread[i];		data->cpu_data[i].user_count = value_user[i];	} 	err = timerlat_bpf_get_summary_value(SUMMARY_MIN,					     value_irq, value_thread, value_user);	if (err)		return err;	for (i = 0; i < nr_cpus; i++) {		data->cpu_data[i].min_irq = value_irq[i];		data->cpu_data[i].min_thread = value_thread[i];		data->cpu_data[i].min_user = value_user[i];	} 	err = timerlat_bpf_get_summary_value(SUMMARY_MAX,					     value_irq, value_thread, value_user);	if (err)		return err;	for (i = 0; i < nr_cpus; i++) {		data->cpu_data[i].max_irq = value_irq[i];		data->cpu_data[i].max_thread = value_thread[i];		data->cpu_data[i].max_user = value_user[i];	} 	err = timerlat_bpf_get_summary_value(SUMMARY_SUM,					     value_irq, value_thread, value_user);	if (err)		return err;	for (i = 0; i < nr_cpus; i++) {		data->cpu_data[i].sum_irq = value_irq[i];		data->cpu_data[i].sum_thread = value_thread[i];		data->cpu_data[i].sum_user = value_user[i];	} 	return 0;} /* * timerlat_top_header - print the header of the tool output */static void timerlat_top_header(struct timerlat_params *params, struct osnoise_tool *top){	struct trace_seq *s = top->trace.seq;	bool pretty = params->common.pretty_output;	char duration[26]; 	get_duration(top->start_time, duration, sizeof(duration)); 	if (pretty)		trace_seq_printf(s, "\033[2;37;40m"); 	trace_seq_printf(s, "                                     Timer Latency                                              ");	if (params->common.user_data)		trace_seq_printf(s, "                                         "); 	if (pretty)		trace_seq_printf(s, "\033[0;0;0m");	trace_seq_printf(s, "\n"); 	trace_seq_printf(s, "%-6s   |          IRQ Timer Latency (%s)        |         Thread Timer Latency (%s)", duration,			params->common.output_divisor == 1 ? "ns" : "us",			params->common.output_divisor == 1 ? "ns" : "us"); 	if (params->common.user_data) {		trace_seq_printf(s, "      |    Ret user Timer Latency (%s)",				params->common.output_divisor == 1 ? "ns" : "us");	} 	trace_seq_printf(s, "\n");	if (pretty)		trace_seq_printf(s, "\033[2;30;47m"); 	trace_seq_printf(s, "CPU COUNT      |      cur       min       avg       max |      cur       min       avg       max");	if (params->common.user_data)		trace_seq_printf(s, " |      cur       min       avg       max"); 	if (pretty)		trace_seq_printf(s, "\033[0;0;0m");	trace_seq_printf(s, "\n");} static const char *no_value = "        -"; /* * timerlat_top_print - prints the output of a given CPU */static void timerlat_top_print(struct osnoise_tool *top, int cpu){	struct timerlat_params *params = to_timerlat_params(top->params);	struct timerlat_top_data *data = top->data;	struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu];	struct trace_seq *s = top->trace.seq; 	/*	 * Skip if no data is available: is this cpu offline?	 */	if (!cpu_data->irq_count && !cpu_data->thread_count)		return; 	/*	 * Unless trace is being lost, IRQ counter is always the max.	 */	trace_seq_printf(s, "%3d #%-9llu |", cpu, cpu_data->irq_count); 	if (!cpu_data->irq_count) {		trace_seq_printf(s, "%s %s %s %s |", no_value, no_value, no_value, no_value);	} else {		trace_seq_printf(s, "%9llu ", cpu_data->cur_irq);		trace_seq_printf(s, "%9llu ", cpu_data->min_irq);		trace_seq_printf(s, "%9llu ", cpu_data->sum_irq / cpu_data->irq_count);		trace_seq_printf(s, "%9llu |", cpu_data->max_irq);	} 	if (!cpu_data->thread_count) {		trace_seq_printf(s, "%s %s %s %s", no_value, no_value, no_value, no_value);	} else {		trace_seq_printf(s, "%9llu ", cpu_data->cur_thread);		trace_seq_printf(s, "%9llu ", cpu_data->min_thread);		trace_seq_printf(s, "%9llu ",				cpu_data->sum_thread / cpu_data->thread_count);		trace_seq_printf(s, "%9llu", cpu_data->max_thread);	} 	if (!params->common.user_data) {		trace_seq_printf(s, "\n");		return;	} 	trace_seq_printf(s, " |"); 	if (!cpu_data->user_count) {		trace_seq_printf(s, "%s %s %s %s\n", no_value, no_value, no_value, no_value);	} else {		trace_seq_printf(s, "%9llu ", cpu_data->cur_user);		trace_seq_printf(s, "%9llu ", cpu_data->min_user);		trace_seq_printf(s, "%9llu ",				cpu_data->sum_user / cpu_data->user_count);		trace_seq_printf(s, "%9llu\n", cpu_data->max_user);	}} /* * timerlat_top_print_sum - prints the summary output */static voidtimerlat_top_print_sum(struct osnoise_tool *top, struct timerlat_top_cpu *summary){	const char *split = "----------------------------------------";	struct timerlat_params *params = to_timerlat_params(top->params);	unsigned long long count = summary->irq_count;	struct trace_seq *s = top->trace.seq;	int e = 0; 	/*	 * Skip if no data is available: is this cpu offline?	 */	if (!summary->irq_count && !summary->thread_count)		return; 	while (count > 999999) {		e++;		count /= 10;	} 	trace_seq_printf(s, "%.*s|%.*s|%.*s", 15, split, 40, split, 39, split);	if (params->common.user_data)		trace_seq_printf(s, "-|%.*s", 39, split);	trace_seq_printf(s, "\n"); 	trace_seq_printf(s, "ALL #%-6llu e%d |", count, e); 	if (!summary->irq_count) {		trace_seq_printf(s, "          %s %s %s |", no_value, no_value, no_value);	} else {		trace_seq_printf(s, "          ");		trace_seq_printf(s, "%9llu ", summary->min_irq);		trace_seq_printf(s, "%9llu ", summary->sum_irq / summary->irq_count);		trace_seq_printf(s, "%9llu |", summary->max_irq);	} 	if (!summary->thread_count) {		trace_seq_printf(s, "%s %s %s %s", no_value, no_value, no_value, no_value);	} else {		trace_seq_printf(s, "          ");		trace_seq_printf(s, "%9llu ", summary->min_thread);		trace_seq_printf(s, "%9llu ",				summary->sum_thread / summary->thread_count);		trace_seq_printf(s, "%9llu", summary->max_thread);	} 	if (!params->common.user_data) {		trace_seq_printf(s, "\n");		return;	} 	trace_seq_printf(s, " |"); 	if (!summary->user_count) {		trace_seq_printf(s, "          %s %s %s |", no_value, no_value, no_value);	} else {		trace_seq_printf(s, "          ");		trace_seq_printf(s, "%9llu ", summary->min_user);		trace_seq_printf(s, "%9llu ",				summary->sum_user / summary->user_count);		trace_seq_printf(s, "%9llu\n", summary->max_user);	}} /* * clear_terminal - clears the output terminal */static void clear_terminal(struct trace_seq *seq){	if (!config_debug)		trace_seq_printf(seq, "\033c");} /* * timerlat_print_stats - print data for all cpus */static voidtimerlat_print_stats(struct osnoise_tool *top){	struct timerlat_params *params = to_timerlat_params(top->params);	struct trace_instance *trace = &top->trace;	struct timerlat_top_cpu summary;	int i; 	if (params->common.aa_only)		return; 	if (!params->common.quiet)		clear_terminal(trace->seq); 	timerlat_top_reset_sum(&summary); 	timerlat_top_header(params, top); 	for_each_monitored_cpu(i, &params->common) {		timerlat_top_print(top, i);		timerlat_top_update_sum(top, i, &summary);	} 	timerlat_top_print_sum(top, &summary); 	trace_seq_do_printf(trace->seq);	trace_seq_reset(trace->seq);	osnoise_report_missed_events(top);} /* * timerlat_top_apply_config - apply the top configs to the initialized tool */static inttimerlat_top_apply_config(struct osnoise_tool *top){	struct timerlat_params *params = to_timerlat_params(top->params);	int retval; 	retval = timerlat_apply_config(top, params);	if (retval)		goto out_err; 	if (isatty(STDOUT_FILENO) && !params->common.quiet)		params->common.pretty_output = 1; 	return 0; out_err:	return -1;} /* * timerlat_init_top - initialize a timerlat top tool with parameters */static struct osnoise_tool*timerlat_init_top(struct common_params *params){	struct osnoise_tool *top; 	top = osnoise_init_tool("timerlat_top");	if (!top)		return NULL; 	top->data = timerlat_alloc_top();	if (!top->data)		goto out_err; 	tep_register_event_handler(top->trace.tep, -1, "ftrace", "timerlat",

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