processor.c

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/*
 *  Copyright IBM Corp. 2008
 *  Author(s): Martin Schwidefsky ([email protected])
 */

#define KMSG_COMPONENT "cpu"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/cpu.h>
#include <asm/elf.h>
#include <asm/lowcore.h>
#include <asm/param.h>

static DEFINE_PER_CPU(struct cpuid, cpu_id);

/*
 * cpu_init - initializes state that is per-CPU.
 */
void __cpuinit cpu_init(void)
{
    struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
    struct cpuid *id = &__get_cpu_var(cpu_id);

    get_cpu_id(id);
    atomic_inc(&init_mm.mm_count);
    current->active_mm = &init_mm;
    BUG_ON(current->mm);
    enter_lazy_tlb(&init_mm, current);
    memset(idle, 0, sizeof(*idle));
}

/*
 * show_cpuinfo - Get information on one CPU for use by procfs.
 */
static int show_cpuinfo(struct seq_file *m, void *v)
{
    static const char *hwcap_str[] = {
        "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
        "edat", "etf3eh", "highgprs", "te"
    };
    unsigned long n = (unsigned long) v - 1;
    int i;

    if (!n) {
        s390_adjust_jiffies();
        seq_printf(m, "vendor_id       : IBM/S390\n"
               "# processors    : %i\n"
               "bogomips per cpu: %lu.%02lu\n",
               num_online_cpus(), loops_per_jiffy/(500000/HZ),
               (loops_per_jiffy/(5000/HZ))%100);
        seq_puts(m, "features\t: ");
        for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
            if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
                seq_printf(m, "%s ", hwcap_str[i]);
        seq_puts(m, "\n");
        show_cacheinfo(m);
    }
    get_online_cpus();
    if (cpu_online(n)) {
        struct cpuid *id = &per_cpu(cpu_id, n);
        seq_printf(m, "processor %li: "
               "version = %02X,  "
               "identification = %06X,  "
               "machine = %04X\n",
               n, id->version, id->ident, id->machine);
    }
    put_online_cpus();
    return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
    return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
    ++*pos;
    return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
    .start  = c_start,
    .next   = c_next,
    .stop   = c_stop,
    .show   = show_cpuinfo,
};