Skip to content
Snippets Groups Projects
Select Git revision
  • 20dd95ef0e1a30e1fc294fa357c3d5cfac735cc8
  • vme-testing default
  • ci-test
  • master
  • remoteproc
  • am625-sk-ov5640
  • pcal6534-upstreaming
  • lps22df-upstreaming
  • msc-upstreaming
  • imx8mp
  • iio/noa1305
  • vme-next
  • vme-next-4.14-rc4
  • v4.14-rc4
  • v4.14-rc3
  • v4.14-rc2
  • v4.14-rc1
  • v4.13
  • vme-next-4.13-rc7
  • v4.13-rc7
  • v4.13-rc6
  • v4.13-rc5
  • v4.13-rc4
  • v4.13-rc3
  • v4.13-rc2
  • v4.13-rc1
  • v4.12
  • v4.12-rc7
  • v4.12-rc6
  • v4.12-rc5
  • v4.12-rc4
  • v4.12-rc3
32 results

tegra-devfreq.c

Blame
  • stat.c 6.05 KiB
    // SPDX-License-Identifier: GPL-2.0
    #include <linux/cpumask.h>
    #include <linux/fs.h>
    #include <linux/init.h>
    #include <linux/interrupt.h>
    #include <linux/kernel_stat.h>
    #include <linux/proc_fs.h>
    #include <linux/sched.h>
    #include <linux/sched/stat.h>
    #include <linux/seq_file.h>
    #include <linux/slab.h>
    #include <linux/time.h>
    #include <linux/irqnr.h>
    #include <linux/sched/cputime.h>
    #include <linux/tick.h>
    
    #ifndef arch_irq_stat_cpu
    #define arch_irq_stat_cpu(cpu) 0
    #endif
    #ifndef arch_irq_stat
    #define arch_irq_stat() 0
    #endif
    
    #ifdef arch_idle_time
    
    static u64 get_idle_time(struct kernel_cpustat *kcs, int cpu)
    {
    	u64 idle;
    
    	idle = kcs->cpustat[CPUTIME_IDLE];
    	if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
    		idle += arch_idle_time(cpu);
    	return idle;
    }
    
    static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu)
    {
    	u64 iowait;
    
    	iowait = kcs->cpustat[CPUTIME_IOWAIT];
    	if (cpu_online(cpu) && nr_iowait_cpu(cpu))
    		iowait += arch_idle_time(cpu);
    	return iowait;
    }
    
    #else
    
    static u64 get_idle_time(struct kernel_cpustat *kcs, int cpu)
    {
    	u64 idle, idle_usecs = -1ULL;
    
    	if (cpu_online(cpu))
    		idle_usecs = get_cpu_idle_time_us(cpu, NULL);
    
    	if (idle_usecs == -1ULL)
    		/* !NO_HZ or cpu offline so we can rely on cpustat.idle */
    		idle = kcs->cpustat[CPUTIME_IDLE];
    	else
    		idle = idle_usecs * NSEC_PER_USEC;
    
    	return idle;
    }
    
    static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu)
    {
    	u64 iowait, iowait_usecs = -1ULL;
    
    	if (cpu_online(cpu))
    		iowait_usecs = get_cpu_iowait_time_us(cpu, NULL);
    
    	if (iowait_usecs == -1ULL)
    		/* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
    		iowait = kcs->cpustat[CPUTIME_IOWAIT];
    	else
    		iowait = iowait_usecs * NSEC_PER_USEC;
    
    	return iowait;
    }
    
    #endif
    
    static void show_irq_gap(struct seq_file *p, unsigned int gap)
    {
    	static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0";
    
    	while (gap > 0) {
    		unsigned int inc;
    
    		inc = min_t(unsigned int, gap, ARRAY_SIZE(zeros) / 2);
    		seq_write(p, zeros, 2 * inc);
    		gap -= inc;
    	}
    }
    
    static void show_all_irqs(struct seq_file *p)
    {
    	unsigned int i, next = 0;
    
    	for_each_active_irq(i) {
    		show_irq_gap(p, i - next);
    		seq_put_decimal_ull(p, " ", kstat_irqs_usr(i));
    		next = i + 1;
    	}
    	show_irq_gap(p, nr_irqs - next);
    }
    
    static int show_stat(struct seq_file *p, void *v)
    {
    	int i, j;
    	u64 user, nice, system, idle, iowait, irq, softirq, steal;
    	u64 guest, guest_nice;
    	u64 sum = 0;
    	u64 sum_softirq = 0;
    	unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
    	struct timespec64 boottime;
    
    	user = nice = system = idle = iowait =
    		irq = softirq = steal = 0;
    	guest = guest_nice = 0;
    	getboottime64(&boottime);
    
    	for_each_possible_cpu(i) {
    		struct kernel_cpustat kcpustat;
    		u64 *cpustat = kcpustat.cpustat;
    
    		kcpustat_cpu_fetch(&kcpustat, i);
    
    		user		+= cpustat[CPUTIME_USER];
    		nice		+= cpustat[CPUTIME_NICE];
    		system		+= cpustat[CPUTIME_SYSTEM];
    		idle		+= get_idle_time(&kcpustat, i);
    		iowait		+= get_iowait_time(&kcpustat, i);
    		irq		+= cpustat[CPUTIME_IRQ];
    		softirq		+= cpustat[CPUTIME_SOFTIRQ];
    		steal		+= cpustat[CPUTIME_STEAL];
    		guest		+= cpustat[CPUTIME_GUEST];
    		guest_nice	+= cpustat[CPUTIME_GUEST_NICE];
    		sum		+= kstat_cpu_irqs_sum(i);
    		sum		+= arch_irq_stat_cpu(i);
    
    		for (j = 0; j < NR_SOFTIRQS; j++) {
    			unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
    
    			per_softirq_sums[j] += softirq_stat;
    			sum_softirq += softirq_stat;
    		}
    	}
    	sum += arch_irq_stat();
    
    	seq_put_decimal_ull(p, "cpu  ", nsec_to_clock_t(user));
    	seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
    	seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
    	seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
    	seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
    	seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
    	seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
    	seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
    	seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
    	seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
    	seq_putc(p, '\n');
    
    	for_each_online_cpu(i) {
    		struct kernel_cpustat kcpustat;
    		u64 *cpustat = kcpustat.cpustat;
    
    		kcpustat_cpu_fetch(&kcpustat, i);
    
    		/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
    		user		= cpustat[CPUTIME_USER];
    		nice		= cpustat[CPUTIME_NICE];
    		system		= cpustat[CPUTIME_SYSTEM];
    		idle		= get_idle_time(&kcpustat, i);
    		iowait		= get_iowait_time(&kcpustat, i);
    		irq		= cpustat[CPUTIME_IRQ];
    		softirq		= cpustat[CPUTIME_SOFTIRQ];
    		steal		= cpustat[CPUTIME_STEAL];
    		guest		= cpustat[CPUTIME_GUEST];
    		guest_nice	= cpustat[CPUTIME_GUEST_NICE];
    		seq_printf(p, "cpu%d", i);
    		seq_put_decimal_ull(p, " ", nsec_to_clock_t(user));
    		seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
    		seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
    		seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
    		seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
    		seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
    		seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
    		seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
    		seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
    		seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
    		seq_putc(p, '\n');
    	}
    	seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
    
    	show_all_irqs(p);
    
    	seq_printf(p,
    		"\nctxt %llu\n"
    		"btime %llu\n"
    		"processes %lu\n"
    		"procs_running %lu\n"
    		"procs_blocked %lu\n",
    		nr_context_switches(),
    		(unsigned long long)boottime.tv_sec,
    		total_forks,
    		nr_running(),
    		nr_iowait());
    
    	seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
    
    	for (i = 0; i < NR_SOFTIRQS; i++)
    		seq_put_decimal_ull(p, " ", per_softirq_sums[i]);
    	seq_putc(p, '\n');
    
    	return 0;
    }
    
    static int stat_open(struct inode *inode, struct file *file)
    {
    	unsigned int size = 1024 + 128 * num_online_cpus();
    
    	/* minimum size to display an interrupt count : 2 bytes */
    	size += 2 * nr_irqs;
    	return single_open_size(file, show_stat, NULL, size);
    }
    
    static const struct file_operations proc_stat_operations = {
    	.open		= stat_open,
    	.read		= seq_read,
    	.llseek		= seq_lseek,
    	.release	= single_release,
    };
    
    static int __init proc_stat_init(void)
    {
    	proc_create("stat", 0, NULL, &proc_stat_operations);
    	return 0;
    }
    fs_initcall(proc_stat_init);