release/src-rt-6.x.4708/linux/linux-2.6.36/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 int op_per_cpu_rc;
  33
  34 static void op_handle_interrupt(struct pt_regs *regs)
  35 {
  36         model->handle_interrupt(regs, ctr);
  37 }
  38
  39 static void op_powerpc_cpu_setup(void *dummy)
  40 {
  41         int ret;
  42
  43         ret = model->cpu_setup(ctr);
  44
  45         if (ret != 0)
  46                 op_per_cpu_rc = ret;
  47 }
  48
  49 static int op_powerpc_setup(void)
  50 {
  51         int err;
  52
  53         op_per_cpu_rc = 0;
  54
  55         /* Grab the hardware */
  56         err = reserve_pmc_hardware(op_handle_interrupt);
  57         if (err)
  58                 return err;
  59
  60         /* Pre-compute the values to stuff in the hardware registers.  */
  61         op_per_cpu_rc = model->reg_setup(ctr, &sys, model->num_counters);
  62
  63         if (op_per_cpu_rc)
  64                 goto out;
  65
  66         /* Configure the registers on all cpus.  If an error occurs on one
  67          * of the cpus, op_per_cpu_rc will be set to the error */
  68         on_each_cpu(op_powerpc_cpu_setup, NULL, 1);
  69
  70 out:    if (op_per_cpu_rc) {
  71                 /* error on setup release the performance counter hardware */
  72                 release_pmc_hardware();
  73         }
  74
  75         return op_per_cpu_rc;
  76 }
  77
  78 static void op_powerpc_shutdown(void)
  79 {
  80         release_pmc_hardware();
  81 }
  82
  83 static void op_powerpc_cpu_start(void *dummy)
  84 {
  85         /* If any of the cpus have return an error, set the
  86          * global flag to the error so it can be returned
  87          * to the generic OProfile caller.
  88          */
  89         int ret;
  90
  91         ret = model->start(ctr);
  92         if (ret != 0)
  93                 op_per_cpu_rc = ret;
  94 }
  95
  96 static int op_powerpc_start(void)
  97 {
  98         op_per_cpu_rc = 0;
  99
 100         if (model->global_start)
 101                 return model->global_start(ctr);
 102         if (model->start) {
 103                 on_each_cpu(op_powerpc_cpu_start, NULL, 1);
 104                 return op_per_cpu_rc;
 105         }
 106         return -EIO; /* No start function is defined for this
 107                         power architecture */
 108 }
 109
 110 static inline void op_powerpc_cpu_stop(void *dummy)
 111 {
 112         model->stop();
 113 }
 114
 115 static void op_powerpc_stop(void)
 116 {
 117         if (model->stop)
 118                 on_each_cpu(op_powerpc_cpu_stop, NULL, 1);
 119         if (model->global_stop)
 120                 model->global_stop();
 121 }
 122
 123 static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
 124 {
 125         int i;
 126
 127 #ifdef CONFIG_PPC64
 128         /*
 129          * There is one mmcr0, mmcr1 and mmcra for setting the events for
 130          * all of the counters.
 131          */
 132         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
 133         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
 134         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
 135 #ifdef CONFIG_OPROFILE_CELL
 136         /* create a file the user tool can check to see what level of profiling
 137          * support exits with this kernel. Initialize bit mask to indicate
 138          * what support the kernel has:
 139          * bit 0      -  Supports SPU event profiling in addition to PPU
 140          *               event and cycles; and SPU cycle profiling
 141          * bits 1-31  -  Currently unused.
 142          *
 143          * If the file does not exist, then the kernel only supports SPU
 144          * cycle profiling, PPU event and cycle profiling.
 145          */
 146         oprofilefs_create_ulong(sb, root, "cell_support", &sys.cell_support);
 147         sys.cell_support = 0x1; /* Note, the user OProfile tool must check
 148                                  * that this bit is set before attempting to
 149                                  * user SPU event profiling.  Older kernels
 150                                  * will not have this file, hence the user
 151                                  * tool is not allowed to do SPU event
 152                                  * profiling on older kernels.  Older kernels
 153                                  * will accept SPU events but collected data
 154                                  * is garbage.
 155                                  */
 156 #endif
 157 #endif
 158
 159         for (i = 0; i < model->num_counters; ++i) {
 160                 struct dentry *dir;
 161                 char buf[4];
 162
 163                 snprintf(buf, sizeof buf, "%d", i);
 164                 dir = oprofilefs_mkdir(sb, root, buf);
 165
 166                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
 167                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
 168                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
 169
 170                 /*
 171                  * Classic PowerPC doesn't support per-counter
 172                  * control like this, but the options are
 173                  * expected, so they remain.  For Freescale
 174                  * Book-E style performance monitors, we do
 175                  * support them.
 176                  */
 177                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
 178                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
 179
 180                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
 181         }
 182
 183         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
 184         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
 185
 186         /* Default to tracing both kernel and user */
 187         sys.enable_kernel = 1;
 188         sys.enable_user = 1;
 189
 190         return 0;
 191 }
 192
 193 int __init oprofile_arch_init(struct oprofile_operations *ops)
 194 {
 195         if (!cur_cpu_spec->oprofile_cpu_type)
 196                 return -ENODEV;
 197
 198         if (firmware_has_feature(FW_FEATURE_ISERIES))
 199                 return -ENODEV;
 200
 201         switch (cur_cpu_spec->oprofile_type) {
 202 #ifdef CONFIG_PPC_BOOK3S_64
 203 #ifdef CONFIG_OPROFILE_CELL
 204                 case PPC_OPROFILE_CELL:
 205                         if (firmware_has_feature(FW_FEATURE_LPAR))
 206                                 return -ENODEV;
 207                         model = &op_model_cell;
 208                         ops->sync_start = model->sync_start;
 209                         ops->sync_stop = model->sync_stop;
 210                         break;
 211 #endif
 212                 case PPC_OPROFILE_RS64:
 213                         model = &op_model_rs64;
 214                         break;
 215                 case PPC_OPROFILE_POWER4:
 216                         model = &op_model_power4;
 217                         break;
 218                 case PPC_OPROFILE_PA6T:
 219                         model = &op_model_pa6t;
 220                         break;
 221 #endif
 222 #ifdef CONFIG_6xx
 223                 case PPC_OPROFILE_G4:
 224                         model = &op_model_7450;
 225                         break;
 226 #endif
 227 #if defined(CONFIG_FSL_EMB_PERFMON)
 228                 case PPC_OPROFILE_FSL_EMB:
 229                         model = &op_model_fsl_emb;
 230                         break;
 231 #endif
 232                 default:
 233                         return -ENODEV;
 234         }
 235
 236         model->num_counters = cur_cpu_spec->num_pmcs;
 237
 238         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
 239         ops->create_files = op_powerpc_create_files;
 240         ops->setup = op_powerpc_setup;
 241         ops->shutdown = op_powerpc_shutdown;
 242         ops->start = op_powerpc_start;
 243         ops->stop = op_powerpc_stop;
 244         ops->backtrace = op_powerpc_backtrace;
 245
 246         printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
 247                ops->cpu_type);
 248
 249         return 0;
 250 }
 251
 252 void oprofile_arch_exit(void)
 253 {
 254 }