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 #include <linux/seq_file.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 atomic_t smtc_fpu_recoveries;
  35
  36 static int smtc_proc_show(struct seq_file *m, void *v)
  37 {
  38         int i;
  39         extern unsigned long ebase;
  40
  41         seq_printf(m, "SMTC Status Word: 0x%08x\n", smtc_status);
  42         seq_printf(m, "Config7: 0x%08x\n", read_c0_config7());
  43         seq_printf(m, "EBASE: 0x%08lx\n", ebase);
  44         seq_printf(m, "Counter Interrupts taken per CPU (TC)\n");
  45         for (i=0; i < NR_CPUS; i++)
  46                 seq_printf(m, "%d: %ld\n", i, smtc_cpu_stats[i].timerints);
  47         seq_printf(m, "Self-IPIs by CPU:\n");
  48         for(i = 0; i < NR_CPUS; i++)
  49                 seq_printf(m, "%d: %ld\n", i, smtc_cpu_stats[i].selfipis);
  50         seq_printf(m, "%d Recoveries of \"stolen\" FPU\n",
  51                    atomic_read(&smtc_fpu_recoveries));
  52         return 0;
  53 }
  54
  55 static int smtc_proc_open(struct inode *inode, struct file *file)
  56 {
  57         return single_open(file, smtc_proc_show, NULL);
  58 }
  59
  60 static const struct file_operations smtc_proc_fops = {
  61         .open           = smtc_proc_open,
  62         .read           = seq_read,
  63         .llseek         = seq_lseek,
  64         .release        = single_release,
  65 };
  66
  67 void init_smtc_stats(void)
  68 {
  69         int i;
  70
  71         for (i=0; i<NR_CPUS; i++) {
  72                 smtc_cpu_stats[i].timerints = 0;
  73                 smtc_cpu_stats[i].selfipis = 0;
  74         }
  75
  76         atomic_set(&smtc_fpu_recoveries, 0);
  77
  78         proc_create("smtc", 0444, NULL, &smtc_proc_fops);
  79 }