smtc-proc.c

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/*
 * /proc hooks for SMTC kernel
 * Copyright (C) 2005 Mips Technologies, Inc
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
#include <linux/interrupt.h>

#include <asm/cpu.h>
#include <asm/processor.h>
#include <linux/atomic.h>
#include <asm/hardirq.h>
#include <asm/mmu_context.h>
#include <asm/mipsregs.h>
#include <asm/cacheflush.h>
#include <linux/proc_fs.h>

#include <asm/smtc_proc.h>

/*
 * /proc diagnostic and statistics hooks
 */

/*
 * Statistics gathered
 */
unsigned long selfipis[NR_CPUS];

struct smtc_cpu_proc smtc_cpu_stats[NR_CPUS];

static struct proc_dir_entry *smtc_stats;

atomic_t smtc_fpu_recoveries;

static int proc_read_smtc(char *page, char **start, off_t off,
                          int count, int *eof, void *data)
{
    int totalen = 0;
    int len;
    int i;
    extern unsigned long ebase;

    len = sprintf(page, "SMTC Status Word: 0x%08x\n", smtc_status);
    totalen += len;
    page += len;
    len = sprintf(page, "Config7: 0x%08x\n", read_c0_config7());
    totalen += len;
    page += len;
    len = sprintf(page, "EBASE: 0x%08lx\n", ebase);
    totalen += len;
    page += len;
    len = sprintf(page, "Counter Interrupts taken per CPU (TC)\n");
    totalen += len;
    page += len;
    for (i=0; i < NR_CPUS; i++) {
        len = sprintf(page, "%d: %ld\n", i, smtc_cpu_stats[i].timerints);
        totalen += len;
        page += len;
    }
    len = sprintf(page, "Self-IPIs by CPU:\n");
    totalen += len;
    page += len;
    for(i = 0; i < NR_CPUS; i++) {
        len = sprintf(page, "%d: %ld\n", i, smtc_cpu_stats[i].selfipis);
        totalen += len;
        page += len;
    }
    len = sprintf(page, "%d Recoveries of \"stolen\" FPU\n",
                  atomic_read(&smtc_fpu_recoveries));
    totalen += len;
    page += len;

    return totalen;
}

void init_smtc_stats(void)
{
    int i;

    for (i=0; i<NR_CPUS; i++) {
        smtc_cpu_stats[i].timerints = 0;
        smtc_cpu_stats[i].selfipis = 0;
    }

    atomic_set(&smtc_fpu_recoveries, 0);

    smtc_stats = create_proc_read_entry("smtc", 0444, NULL,
                                        proc_read_smtc, NULL);
}