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 void op_powerpc_cpu_setup(void *dummy)
  38 {
  39         model->cpu_setup(ctr);
  40 }
  41
  42 static int op_powerpc_setup(void)
  43 {
  44         int err;
  45
  46         /* Grab the hardware */
  47         err = reserve_pmc_hardware(op_handle_interrupt);
  48         if (err)
  49                 return err;
  50
  51         /* Pre-compute the values to stuff in the hardware registers.  */
  52         model->reg_setup(ctr, &sys, model->num_counters);
  53
  54         /* Configure the registers on all cpus.  */
  55         on_each_cpu(op_powerpc_cpu_setup, NULL, 0, 1);
  56
  57         return 0;
  58 }
  59
  60 static void op_powerpc_shutdown(void)
  61 {
  62         release_pmc_hardware();
  63 }
  64
  65 static void op_powerpc_cpu_start(void *dummy)
  66 {
  67         model->start(ctr);
  68 }
  69
  70 static int op_powerpc_start(void)
  71 {
  72         on_each_cpu(op_powerpc_cpu_start, NULL, 0, 1);
  73         return 0;
  74 }
  75
  76 static inline void op_powerpc_cpu_stop(void *dummy)
  77 {
  78         model->stop();
  79 }
  80
  81 static void op_powerpc_stop(void)
  82 {
  83         on_each_cpu(op_powerpc_cpu_stop, NULL, 0, 1);
  84 }
  85
  86 static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
  87 {
  88         int i;
  89
  90 #ifdef CONFIG_PPC64
  91         /*
  92          * There is one mmcr0, mmcr1 and mmcra for setting the events for
  93          * all of the counters.
  94          */
  95         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
  96         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
  97         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
  98 #endif
  99
 100         for (i = 0; i < model->num_counters; ++i) {
 101                 struct dentry *dir;
 102                 char buf[4];
 103
 104                 snprintf(buf, sizeof buf, "%d", i);
 105                 dir = oprofilefs_mkdir(sb, root, buf);
 106
 107                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
 108                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
 109                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
 110
 111                 /*
 112                  * Classic PowerPC doesn't support per-counter
 113                  * control like this, but the options are
 114                  * expected, so they remain.  For Freescale
 115                  * Book-E style performance monitors, we do
 116                  * support them.
 117                  */
 118                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
 119                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
 120
 121                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
 122         }
 123
 124         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
 125         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
 126
 127         /* Default to tracing both kernel and user */
 128         sys.enable_kernel = 1;
 129         sys.enable_user = 1;
 130
 131         return 0;
 132 }
 133
 134 int __init oprofile_arch_init(struct oprofile_operations *ops)
 135 {
 136         if (!cur_cpu_spec->oprofile_cpu_type)
 137                 return -ENODEV;
 138
 139         if (firmware_has_feature(FW_FEATURE_ISERIES))
 140                 return -ENODEV;
 141
 142         switch (cur_cpu_spec->oprofile_type) {
 143 #ifdef CONFIG_PPC64
 144                 case PPC_OPROFILE_RS64:
 145                         model = &op_model_rs64;
 146                         break;
 147                 case PPC_OPROFILE_POWER4:
 148                         model = &op_model_power4;
 149                         break;
 150 #endif
 151 #ifdef CONFIG_6xx
 152                 case PPC_OPROFILE_G4:
 153                         model = &op_model_7450;
 154                         break;
 155 #endif
 156 #ifdef CONFIG_FSL_BOOKE
 157                 case PPC_OPROFILE_BOOKE:
 158                         model = &op_model_fsl_booke;
 159                         break;
 160 #endif
 161                 default:
 162                         return -ENODEV;
 163         }
 164
 165         model->num_counters = cur_cpu_spec->num_pmcs;
 166
 167         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
 168         ops->create_files = op_powerpc_create_files;
 169         ops->setup = op_powerpc_setup;
 170         ops->shutdown = op_powerpc_shutdown;
 171         ops->start = op_powerpc_start;
 172         ops->stop = op_powerpc_stop;
 173         ops->backtrace = op_powerpc_backtrace;
 174
 175         printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
 176                ops->cpu_type);
 177
 178         return 0;
 179 }
 180
 181 void oprofile_arch_exit(void)
 182 {
 183 }