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common.c

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/**
 * @file arch/alpha/oprofile/common.c
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author Richard Henderson <rth@twiddle.net>
 */

#include <linux/oprofile.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <asm/ptrace.h>
#include <asm/system.h>

#include "op_impl.h"

extern struct op_axp_model op_model_ev4 __attribute__((weak));
extern struct op_axp_model op_model_ev5 __attribute__((weak));
extern struct op_axp_model op_model_pca56 __attribute__((weak));
extern struct op_axp_model op_model_ev6 __attribute__((weak));
extern struct op_axp_model op_model_ev67 __attribute__((weak));

static struct op_axp_model *model;

extern void (*perf_irq)(unsigned long, struct pt_regs *);
static void (*save_perf_irq)(unsigned long, struct pt_regs *);

static struct op_counter_config ctr[20];
static struct op_system_config sys;
static struct op_register_config reg;

/* Called from do_entInt to handle the performance monitor interrupt.  */

static void
op_handle_interrupt(unsigned long which, struct pt_regs *regs)
{
      model->handle_interrupt(which, regs, ctr);

      /* If the user has selected an interrupt frequency that is
         not exactly the width of the counter, write a new value
         into the counter such that it'll overflow after N more
         events.  */
      if ((reg.need_reset >> which) & 1)
            model->reset_ctr(&reg, which);
}
 
static int
op_axp_setup(void)
{
      unsigned long i, e;

      /* Install our interrupt handler into the existing hook.  */
      save_perf_irq = perf_irq;
      perf_irq = op_handle_interrupt;

      /* Compute the mask of enabled counters.  */
      for (i = e = 0; i < model->num_counters; ++i)
            if (ctr[i].enabled)
                  e |= 1 << i;
      reg.enable = e;

      /* Pre-compute the values to stuff in the hardware registers.  */
      model->reg_setup(&reg, ctr, &sys);

      /* Configure the registers on all cpus.  */
      (void)smp_call_function(model->cpu_setup, &reg, 1);
      model->cpu_setup(&reg);
      return 0;
}

static void
op_axp_shutdown(void)
{
      /* Remove our interrupt handler.  We may be removing this module.  */
      perf_irq = save_perf_irq;
}

static void
op_axp_cpu_start(void *dummy)
{
      wrperfmon(1, reg.enable);
}

static int
op_axp_start(void)
{
      (void)smp_call_function(op_axp_cpu_start, NULL, 1);
      op_axp_cpu_start(NULL);
      return 0;
}

static inline void
op_axp_cpu_stop(void *dummy)
{
      /* Disable performance monitoring for all counters.  */
      wrperfmon(0, -1);
}

static void
op_axp_stop(void)
{
      (void)smp_call_function(op_axp_cpu_stop, NULL, 1);
      op_axp_cpu_stop(NULL);
}

static int
op_axp_create_files(struct super_block * sb, struct dentry * root)
{
      int i;

      for (i = 0; i < model->num_counters; ++i) {
            struct dentry *dir;
            char buf[4];

            snprintf(buf, sizeof buf, "%d", i);
            dir = oprofilefs_mkdir(sb, root, buf);

            oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
                oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
            oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
            /* Dummies.  */
            oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
            oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
            oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
      }

      if (model->can_set_proc_mode) {
            oprofilefs_create_ulong(sb, root, "enable_pal",
                              &sys.enable_pal);
            oprofilefs_create_ulong(sb, root, "enable_kernel",
                              &sys.enable_kernel);
            oprofilefs_create_ulong(sb, root, "enable_user",
                              &sys.enable_user);
      }

      return 0;
}

int __init
00142 oprofile_arch_init(struct oprofile_operations *ops)
{
      struct op_axp_model *lmodel = NULL;

      switch (implver()) {
      case IMPLVER_EV4:
            lmodel = &op_model_ev4;
            break;
      case IMPLVER_EV5:
            /* 21164PC has a slightly different set of events.
               Recognize the chip by the presence of the MAX insns.  */
            if (!amask(AMASK_MAX))
                  lmodel = &op_model_pca56;
            else
                  lmodel = &op_model_ev5;
            break;
      case IMPLVER_EV6:
            /* 21264A supports ProfileMe.
               Recognize the chip by the presence of the CIX insns.  */
            if (!amask(AMASK_CIX))
                  lmodel = &op_model_ev67;
            else
                  lmodel = &op_model_ev6;
            break;
      }

      if (!lmodel)
            return -ENODEV;
      model = lmodel;

      ops->create_files = op_axp_create_files;
      ops->setup = op_axp_setup;
      ops->shutdown = op_axp_shutdown;
      ops->start = op_axp_start;
      ops->stop = op_axp_stop;
      ops->cpu_type = lmodel->cpu_type;

      printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
             lmodel->cpu_type);

      return 0;
}


void
00187 oprofile_arch_exit(void)
{
}

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