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 #include <asm/special_insns.h>
  16
  17 #include "op_impl.h"
  18
  19 extern struct op_axp_model op_model_ev4 __attribute__((weak));
  20 extern struct op_axp_model op_model_ev5 __attribute__((weak));
  21 extern struct op_axp_model op_model_pca56 __attribute__((weak));
  22 extern struct op_axp_model op_model_ev6 __attribute__((weak));
  23 extern struct op_axp_model op_model_ev67 __attribute__((weak));
  24
  25 static struct op_axp_model *model;
  26
  27 extern void (*perf_irq)(unsigned long, struct pt_regs *);
  28 static void (*save_perf_irq)(unsigned long, struct pt_regs *);
  29
  30 static struct op_counter_config ctr[20];
  31 static struct op_system_config sys;
  32 static struct op_register_config reg;
  33
  34 /* Called from do_entInt to handle the performance monitor interrupt.  */
  35
  36 static void
  37 op_handle_interrupt(unsigned long which, struct pt_regs *regs)
  38 {
  39         model->handle_interrupt(which, regs, ctr);
  40
  41         /* If the user has selected an interrupt frequency that is
  42            not exactly the width of the counter, write a new value
  43            into the counter such that it'll overflow after N more
  44            events.  */
  45         if ((reg.need_reset >> which) & 1)
  46                 model->reset_ctr(&reg, which);
  47 }
  48
  49 static int
  50 op_axp_setup(void)
  51 {
  52         unsigned long i, e;
  53
  54         /* Install our interrupt handler into the existing hook.  */
  55         save_perf_irq = perf_irq;
  56         perf_irq = op_handle_interrupt;
  57
  58         /* Compute the mask of enabled counters.  */
  59         for (i = e = 0; i < model->num_counters; ++i)
  60                 if (ctr[i].enabled)
  61                         e |= 1 << i;
  62         reg.enable = e;
  63
  64         /* Pre-compute the values to stuff in the hardware registers.  */
  65         model->reg_setup(&reg, ctr, &sys);
  66
  67         /* Configure the registers on all cpus.  */
  68         (void)smp_call_function(model->cpu_setup, &reg, 1);
  69         model->cpu_setup(&reg);
  70         return 0;
  71 }
  72
  73 static void
  74 op_axp_shutdown(void)
  75 {
  76         /* Remove our interrupt handler.  We may be removing this module.  */
  77         perf_irq = save_perf_irq;
  78 }
  79
  80 static void
  81 op_axp_cpu_start(void *dummy)
  82 {
  83         wrperfmon(1, reg.enable);
  84 }
  85
  86 static int
  87 op_axp_start(void)
  88 {
  89         (void)smp_call_function(op_axp_cpu_start, NULL, 1);
  90         op_axp_cpu_start(NULL);
  91         return 0;
  92 }
  93
  94 static inline void
  95 op_axp_cpu_stop(void *dummy)
  96 {
  97         /* Disable performance monitoring for all counters.  */
  98         wrperfmon(0, -1);
  99 }
 100
 101 static void
 102 op_axp_stop(void)
 103 {
 104         (void)smp_call_function(op_axp_cpu_stop, NULL, 1);
 105         op_axp_cpu_stop(NULL);
 106 }
 107
 108 static int
 109 op_axp_create_files(struct dentry *root)
 110 {
 111         int i;
 112
 113         for (i = 0; i < model->num_counters; ++i) {
 114                 struct dentry *dir;
 115                 char buf[4];
 116
 117                 snprintf(buf, sizeof buf, "%d", i);
 118                 dir = oprofilefs_mkdir(root, buf);
 119
 120                 oprofilefs_create_ulong(dir, "enabled", &ctr[i].enabled);
 121                 oprofilefs_create_ulong(dir, "event", &ctr[i].event);
 122                 oprofilefs_create_ulong(dir, "count", &ctr[i].count);
 123                 /* Dummies.  */
 124                 oprofilefs_create_ulong(dir, "kernel", &ctr[i].kernel);
 125                 oprofilefs_create_ulong(dir, "user", &ctr[i].user);
 126                 oprofilefs_create_ulong(dir, "unit_mask", &ctr[i].unit_mask);
 127         }
 128
 129         if (model->can_set_proc_mode) {
 130                 oprofilefs_create_ulong(root, "enable_pal",
 131                                         &sys.enable_pal);
 132                 oprofilefs_create_ulong(root, "enable_kernel",
 133                                         &sys.enable_kernel);
 134                 oprofilefs_create_ulong(root, "enable_user",
 135                                         &sys.enable_user);
 136         }
 137
 138         return 0;
 139 }
 140
 141 int __init
 142 oprofile_arch_init(struct oprofile_operations *ops)
 143 {
 144         struct op_axp_model *lmodel = NULL;
 145
 146         switch (implver()) {
 147         case IMPLVER_EV4:
 148                 lmodel = &op_model_ev4;
 149                 break;
 150         case IMPLVER_EV5:
 151                 /* 21164PC has a slightly different set of events.
 152                    Recognize the chip by the presence of the MAX insns.  */
 153                 if (!amask(AMASK_MAX))
 154                         lmodel = &op_model_pca56;
 155                 else
 156                         lmodel = &op_model_ev5;
 157                 break;
 158         case IMPLVER_EV6:
 159                 /* 21264A supports ProfileMe.
 160                    Recognize the chip by the presence of the CIX insns.  */
 161                 if (!amask(AMASK_CIX))
 162                         lmodel = &op_model_ev67;
 163                 else
 164                         lmodel = &op_model_ev6;
 165                 break;
 166         }
 167
 168         if (!lmodel)
 169                 return -ENODEV;
 170         model = lmodel;
 171
 172         ops->create_files = op_axp_create_files;
 173         ops->setup = op_axp_setup;
 174         ops->shutdown = op_axp_shutdown;
 175         ops->start = op_axp_start;
 176         ops->stop = op_axp_stop;
 177         ops->cpu_type = lmodel->cpu_type;
 178
 179         printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
 180                lmodel->cpu_type);
 181
 182         return 0;
 183 }
 184
 185
 186 void
 187 oprofile_arch_exit(void)
 188 {
 189 }