arch/alpha/oprofile/common.c

   1 /**
   2  * @file arch/alpha/oprofile/common.c
   3  *
   4  * @remark Copyright 2002 OProfile authors
   5  * @remark Read the file COPYING
   6  *
   7  * @author Richard Henderson <rth@twiddle.net>
   8  */
   9
  10 #include <linux/oprofile.h>
  11 #include <linux/init.h>
  12 #include <linux/smp.h>
  13 #include <linux/errno.h>
  14 #include <asm/ptrace.h>
  15
  16 #include "op_impl.h"
  17
  18 extern struct op_axp_model op_model_ev4 __attribute__((weak));
  19 extern struct op_axp_model op_model_ev5 __attribute__((weak));
  20 extern struct op_axp_model op_model_pca56 __attribute__((weak));
  21 extern struct op_axp_model op_model_ev6 __attribute__((weak));
  22 extern struct op_axp_model op_model_ev67 __attribute__((weak));
  23
  24 static struct op_axp_model *model;
  25
  26 extern void (*perf_irq)(unsigned long, struct pt_regs *);
  27 static void (*save_perf_irq)(unsigned long, struct pt_regs *);
  28
  29 static struct op_counter_config ctr[20];
  30 static struct op_system_config sys;
  31 static struct op_register_config reg;
  32
  33 /* Called from do_entInt to handle the performance monitor interrupt.  */
  34
  35 static void
  36 op_handle_interrupt(unsigned long which, struct pt_regs *regs)
  37 {
  38         model->handle_interrupt(which, regs, ctr);
  39
  40         /* If the user has selected an interrupt frequency that is
  41            not exactly the width of the counter, write a new value
  42            into the counter such that it'll overflow after N more
  43            events.  */
  44         if ((reg.need_reset >> which) & 1)
  45                 model->reset_ctr(&reg, which);
  46 }
  47
  48 static int
  49 op_axp_setup(void)
  50 {
  51         unsigned long i, e;
  52
  53         /* Install our interrupt handler into the existing hook.  */
  54         save_perf_irq = perf_irq;
  55         perf_irq = op_handle_interrupt;
  56
  57         /* Compute the mask of enabled counters.  */
  58         for (i = e = 0; i < model->num_counters; ++i)
  59                 if (ctr[i].enabled)
  60                         e |= 1 << i;
  61         reg.enable = e;
  62
  63         /* Pre-compute the values to stuff in the hardware registers.  */
  64         model->reg_setup(&reg, ctr, &sys);
  65
  66         /* Configure the registers on all cpus.  */
  67         (void)smp_call_function(model->cpu_setup, &reg, 1);
  68         model->cpu_setup(&reg);
  69         return 0;
  70 }
  71
  72 static void
  73 op_axp_shutdown(void)
  74 {
  75         /* Remove our interrupt handler.  We may be removing this module.  */
  76         perf_irq = save_perf_irq;
  77 }
  78
  79 static void
  80 op_axp_cpu_start(void *dummy)
  81 {
  82         wrperfmon(1, reg.enable);
  83 }
  84
  85 static int
  86 op_axp_start(void)
  87 {
  88         (void)smp_call_function(op_axp_cpu_start, NULL, 1);
  89         op_axp_cpu_start(NULL);
  90         return 0;
  91 }
  92
  93 static inline void
  94 op_axp_cpu_stop(void *dummy)
  95 {
  96         /* Disable performance monitoring for all counters.  */
  97         wrperfmon(0, -1);
  98 }
  99
 100 static void
 101 op_axp_stop(void)
 102 {
 103         (void)smp_call_function(op_axp_cpu_stop, NULL, 1);
 104         op_axp_cpu_stop(NULL);
 105 }
 106
 107 static int
 108 op_axp_create_files(struct super_block *sb, struct dentry *root)
 109 {
 110         int i;
 111
 112         for (i = 0; i < model->num_counters; ++i) {
 113                 struct dentry *dir;
 114                 char buf[4];
 115
 116                 snprintf(buf, sizeof buf, "%d", i);
 117                 dir = oprofilefs_mkdir(sb, root, buf);
 118
 119                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
 120                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
 121                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
 122                 /* Dummies.  */
 123                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
 124                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
 125                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
 126         }
 127
 128         if (model->can_set_proc_mode) {
 129                 oprofilefs_create_ulong(sb, root, "enable_pal",
 130                                         &sys.enable_pal);
 131                 oprofilefs_create_ulong(sb, root, "enable_kernel",
 132                                         &sys.enable_kernel);
 133                 oprofilefs_create_ulong(sb, root, "enable_user",
 134                                         &sys.enable_user);
 135         }
 136
 137         return 0;
 138 }
 139
 140 int __init
 141 oprofile_arch_init(struct oprofile_operations *ops)
 142 {
 143         struct op_axp_model *lmodel = NULL;
 144
 145         switch (implver()) {
 146         case IMPLVER_EV4:
 147                 lmodel = &op_model_ev4;
 148                 break;
 149         case IMPLVER_EV5:
 150                 /* 21164PC has a slightly different set of events.
 151                    Recognize the chip by the presence of the MAX insns.  */
 152                 if (!amask(AMASK_MAX))
 153                         lmodel = &op_model_pca56;
 154                 else
 155                         lmodel = &op_model_ev5;
 156                 break;
 157         case IMPLVER_EV6:
 158                 /* 21264A supports ProfileMe.
 159                    Recognize the chip by the presence of the CIX insns.  */
 160                 if (!amask(AMASK_CIX))
 161                         lmodel = &op_model_ev67;
 162                 else
 163                         lmodel = &op_model_ev6;
 164                 break;
 165         }
 166
 167         if (!lmodel)
 168                 return -ENODEV;
 169         model = lmodel;
 170
 171         ops->create_files = op_axp_create_files;
 172         ops->setup = op_axp_setup;
 173         ops->shutdown = op_axp_shutdown;
 174         ops->start = op_axp_start;
 175         ops->stop = op_axp_stop;
 176         ops->cpu_type = lmodel->cpu_type;
 177
 178         printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
 179                lmodel->cpu_type);
 180
 181         return 0;
 182 }
 183
 184
 185 void
 186 oprofile_arch_exit(void)
 187 {
 188 }