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/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  */
  30 unsigned long selfipis[NR_CPUS];
  31
  32 struct smtc_cpu_proc smtc_cpu_stats[NR_CPUS];
  33
  34 static struct proc_dir_entry *smtc_stats;
  35
  36 atomic_t smtc_fpu_recoveries;
  37
  38 static 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
  79 void 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 }