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common.c

/*
 * PPC 64 oprofile support:
 * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
 * PPC 32 oprofile support: (based on PPC 64 support)
 * Copyright (C) Freescale Semiconductor, Inc 2004
 *    Author: Andy Fleming
 *
 * Based on alpha version.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#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 <asm/pmc.h>
#include <asm/cputable.h>
#include <asm/oprofile_impl.h>
#include <asm/firmware.h>

static struct op_powerpc_model *model;

static struct op_counter_config ctr[OP_MAX_COUNTER];
static struct op_system_config sys;

static int op_per_cpu_rc;

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

static void op_powerpc_cpu_setup(void *dummy)
{
      int ret;

      ret = model->cpu_setup(ctr);

      if (ret != 0)
            op_per_cpu_rc = ret;
}

static int op_powerpc_setup(void)
{
      int err;

      op_per_cpu_rc = 0;

      /* Grab the hardware */
      err = reserve_pmc_hardware(op_handle_interrupt);
      if (err)
            return err;

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

      if (op_per_cpu_rc)
            goto out;

      /* Configure the registers on all cpus.    If an error occurs on one
       * of the cpus, op_per_cpu_rc will be set to the error */
      on_each_cpu(op_powerpc_cpu_setup, NULL, 0, 1);

out:  if (op_per_cpu_rc) {
            /* error on setup release the performance counter hardware */
            release_pmc_hardware();
      }

      return op_per_cpu_rc;
}

static void op_powerpc_shutdown(void)
{
      release_pmc_hardware();
}

static void op_powerpc_cpu_start(void *dummy)
{
      /* If any of the cpus have return an error, set the
       * global flag to the error so it can be returned
       * to the generic OProfile caller.
       */
      int ret;

      ret = model->start(ctr);
      if (ret != 0)
            op_per_cpu_rc = ret;
}

static int op_powerpc_start(void)
{
      op_per_cpu_rc = 0;

      if (model->global_start)
            return model->global_start(ctr);
      if (model->start) {
            on_each_cpu(op_powerpc_cpu_start, NULL, 0, 1);
            return op_per_cpu_rc;
      }
      return -EIO; /* No start function is defined for this
                  power architecture */
}

static inline void op_powerpc_cpu_stop(void *dummy)
{
      model->stop();
}

static void op_powerpc_stop(void)
{
      if (model->stop)
            on_each_cpu(op_powerpc_cpu_stop, NULL, 0, 1);
        if (model->global_stop)
                model->global_stop();
}

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

#ifdef CONFIG_PPC64
      /*
       * There is one mmcr0, mmcr1 and mmcra for setting the events for
       * all of the counters.
       */
      oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
      oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
      oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
#endif

      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);

            /*
             * Classic PowerPC doesn't support per-counter
             * control like this, but the options are
             * expected, so they remain.  For Freescale
             * Book-E style performance monitors, we do
             * support them.
             */
            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);
      }

      oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
      oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);

      /* Default to tracing both kernel and user */
      sys.enable_kernel = 1;
      sys.enable_user = 1;

      return 0;
}

int __init oprofile_arch_init(struct oprofile_operations *ops)
{
      if (!cur_cpu_spec->oprofile_cpu_type)
            return -ENODEV;

      if (firmware_has_feature(FW_FEATURE_ISERIES))
            return -ENODEV;

      switch (cur_cpu_spec->oprofile_type) {
#ifdef CONFIG_PPC64
#ifdef CONFIG_OPROFILE_CELL
            case PPC_OPROFILE_CELL:
                  if (firmware_has_feature(FW_FEATURE_LPAR))
                        return -ENODEV;
                  model = &op_model_cell;
                  ops->sync_start = model->sync_start;
                  ops->sync_stop = model->sync_stop;
                  break;
#endif
            case PPC_OPROFILE_RS64:
                  model = &op_model_rs64;
                  break;
            case PPC_OPROFILE_POWER4:
                  model = &op_model_power4;
                  break;
            case PPC_OPROFILE_PA6T:
                  model = &op_model_pa6t;
                  break;
#endif
#ifdef CONFIG_6xx
            case PPC_OPROFILE_G4:
                  model = &op_model_7450;
                  break;
#endif
#ifdef CONFIG_FSL_BOOKE
            case PPC_OPROFILE_BOOKE:
                  model = &op_model_fsl_booke;
                  break;
#endif
            default:
                  return -ENODEV;
      }

      model->num_counters = cur_cpu_spec->num_pmcs;

      ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
      ops->create_files = op_powerpc_create_files;
      ops->setup = op_powerpc_setup;
      ops->shutdown = op_powerpc_shutdown;
      ops->start = op_powerpc_start;
      ops->stop = op_powerpc_stop;
      ops->backtrace = op_powerpc_backtrace;

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

      return 0;
}

void oprofile_arch_exit(void)
{
}

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