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