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