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