LXR linux/arch/mips/kernel/smtc-proc.c

   1/*
   2 * /proc hooks for SMTC kernel
   3 * Copyright (C) 2005 Mips Technologies, Inc
   4 */
   5
   6#include <linux/kernel.h>
   7#include <linux/sched.h>
   8#include <linux/cpumask.h>
   9#include <linux/interrupt.h>
  10
  11#include <asm/cpu.h>
  12#include <asm/processor.h>
  13#include <asm/atomic.h>
  14#include <asm/system.h>
  15#include <asm/hardirq.h>
  16#include <asm/mmu_context.h>
  17#include <asm/smp.h>
  18#include <asm/mipsregs.h>
  19#include <asm/cacheflush.h>
  20#include <linux/proc_fs.h>
  21
  22#include <asm/smtc_proc.h>
  23
  24/*
  25 * /proc diagnostic and statistics hooks
  26 */
  27
  28/*
  29 * Statistics gathered
  30 */
  31unsigned long selfipis[NR_CPUS];
  32
  33struct smtc_cpu_proc smtc_cpu_stats[NR_CPUS];
  34
  35static struct proc_dir_entry *smtc_stats;
  36
  37atomic_t smtc_fpu_recoveries;
  38
  39static int proc_read_smtc(char *page, char **start, off_t off,
  40                          int count, int *eof, void *data)
  41{
  42        int totalen = 0;
  43        int len;
  44        int i;
  45        extern unsigned long ebase;
  46
  47        len = sprintf(page, "SMTC Status Word: 0x%08x\n", smtc_status);
  48        totalen += len;
  49        page += len;
  50        len = sprintf(page, "Config7: 0x%08x\n", read_c0_config7());
  51        totalen += len;
  52        page += len;
  53        len = sprintf(page, "EBASE: 0x%08lx\n", ebase);
  54        totalen += len;
  55        page += len;
  56        len = sprintf(page, "Counter Interrupts taken per CPU (TC)\n");
  57        totalen += len;
  58        page += len;
  59        for (i=0; i < NR_CPUS; i++) {
  60                len = sprintf(page, "%d: %ld\n", i, smtc_cpu_stats[i].timerints);
  61                totalen += len;
  62                page += len;
  63        }
  64        len = sprintf(page, "Self-IPIs by CPU:\n");
  65        totalen += len;
  66        page += len;
  67        for(i = 0; i < NR_CPUS; i++) {
  68                len = sprintf(page, "%d: %ld\n", i, smtc_cpu_stats[i].selfipis);
  69                totalen += len;
  70                page += len;
  71        }
  72        len = sprintf(page, "%d Recoveries of \"stolen\" FPU\n",
  73                      atomic_read(&smtc_fpu_recoveries));
  74        totalen += len;
  75        page += len;
  76
  77        return totalen;
  78}
  79
  80void init_smtc_stats(void)
  81{
  82        int i;
  83
  84        for (i=0; i<NR_CPUS; i++) {
  85                smtc_cpu_stats[i].timerints = 0;
  86                smtc_cpu_stats[i].selfipis = 0;
  87        }
  88
  89        atomic_set(&smtc_fpu_recoveries, 0);
  90
  91        smtc_stats = create_proc_read_entry("smtc", 0444, NULL,
  92                                            proc_read_smtc, NULL);
  93}
  94