arch/powerpc/oprofile/common.c

   1 /*
   2  * PPC 64 oprofile support:
   3  * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
   4  * PPC 32 oprofile support: (based on PPC 64 support)
   5  * Copyright (C) Freescale Semiconductor, Inc 2004
   6  *      Author: Andy Fleming
   7  *
   8  * Based on alpha version.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version
  13  * 2 of the License, or (at your option) any later version.
  14  */
  15
  16 #include <linux/oprofile.h>
  17 #include <linux/init.h>
  18 #include <linux/smp.h>
  19 #include <linux/errno.h>
  20 #include <asm/ptrace.h>
  21 #include <asm/system.h>
  22 #include <asm/pmc.h>
  23 #include <asm/cputable.h>
  24 #include <asm/oprofile_impl.h>
  25 #include <asm/firmware.h>
  26
  27 static struct op_powerpc_model *model;
  28
  29 static struct op_counter_config ctr[OP_MAX_COUNTER];
  30 static struct op_system_config sys;
  31
  32 static void op_handle_interrupt(struct pt_regs *regs)
  33 {
  34         model->handle_interrupt(regs, ctr);
  35 }
  36
  37 static int op_powerpc_setup(void)
  38 {
  39         int err;
  40
  41         /* Grab the hardware */
  42         err = reserve_pmc_hardware(op_handle_interrupt);
  43         if (err)
  44                 return err;
  45
  46         /* Pre-compute the values to stuff in the hardware registers.  */
  47         model->reg_setup(ctr, &sys, model->num_counters);
  48
  49         /* Configure the registers on all cpus.  */
  50         on_each_cpu(model->cpu_setup, NULL, 0, 1);
  51
  52         return 0;
  53 }
  54
  55 static void op_powerpc_shutdown(void)
  56 {
  57         release_pmc_hardware();
  58 }
  59
  60 static void op_powerpc_cpu_start(void *dummy)
  61 {
  62         model->start(ctr);
  63 }
  64
  65 static int op_powerpc_start(void)
  66 {
  67         on_each_cpu(op_powerpc_cpu_start, NULL, 0, 1);
  68         return 0;
  69 }
  70
  71 static inline void op_powerpc_cpu_stop(void *dummy)
  72 {
  73         model->stop();
  74 }
  75
  76 static void op_powerpc_stop(void)
  77 {
  78         on_each_cpu(op_powerpc_cpu_stop, NULL, 0, 1);
  79 }
  80
  81 static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
  82 {
  83         int i;
  84
  85 #ifdef CONFIG_PPC64
  86         /*
  87          * There is one mmcr0, mmcr1 and mmcra for setting the events for
  88          * all of the counters.
  89          */
  90         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
  91         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
  92         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
  93 #endif
  94
  95         for (i = 0; i < model->num_counters; ++i) {
  96                 struct dentry *dir;
  97                 char buf[4];
  98
  99                 snprintf(buf, sizeof buf, "%d", i);
 100                 dir = oprofilefs_mkdir(sb, root, buf);
 101
 102                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
 103                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
 104                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
 105
 106                 /*
 107                  * Classic PowerPC doesn't support per-counter
 108                  * control like this, but the options are
 109                  * expected, so they remain.  For Freescale
 110                  * Book-E style performance monitors, we do
 111                  * support them.
 112                  */
 113                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
 114                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
 115
 116                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
 117         }
 118
 119         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
 120         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
 121
 122         /* Default to tracing both kernel and user */
 123         sys.enable_kernel = 1;
 124         sys.enable_user = 1;
 125
 126         return 0;
 127 }
 128
 129 int __init oprofile_arch_init(struct oprofile_operations *ops)
 130 {
 131         if (!cur_cpu_spec->oprofile_cpu_type)
 132                 return -ENODEV;
 133
 134         if (firmware_has_feature(FW_FEATURE_ISERIES))
 135                 return -ENODEV;
 136
 137         switch (cur_cpu_spec->oprofile_type) {
 138 #ifdef CONFIG_PPC64
 139                 case PPC_OPROFILE_RS64:
 140                         model = &op_model_rs64;
 141                         break;
 142                 case PPC_OPROFILE_POWER4:
 143                         model = &op_model_power4;
 144                         break;
 145 #else
 146                 case PPC_OPROFILE_G4:
 147                         model = &op_model_7450;
 148                         break;
 149 #endif
 150 #ifdef CONFIG_FSL_BOOKE
 151                 case PPC_OPROFILE_BOOKE:
 152                         model = &op_model_fsl_booke;
 153                         break;
 154 #endif
 155                 default:
 156                         return -ENODEV;
 157         }
 158
 159         model->num_counters = cur_cpu_spec->num_pmcs;
 160
 161         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
 162         ops->create_files = op_powerpc_create_files;
 163         ops->setup = op_powerpc_setup;
 164         ops->shutdown = op_powerpc_shutdown;
 165         ops->start = op_powerpc_start;
 166         ops->stop = op_powerpc_stop;
 167         ops->backtrace = op_powerpc_backtrace;
 168
 169         printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
 170                ops->cpu_type);
 171
 172         return 0;
 173 }
 174
 175 void oprofile_arch_exit(void)
 176 {
 177 }