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