kernel/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/pmc.h>
  22 #include <asm/cputable.h>
  23 #include <asm/oprofile_impl.h>
  24 #include <asm/firmware.h>
  25
  26 static struct op_powerpc_model *model;
  27
  28 static struct op_counter_config ctr[OP_MAX_COUNTER];
  29 static struct op_system_config sys;
  30
  31 static int op_per_cpu_rc;
  32
  33 static void op_handle_interrupt(struct pt_regs *regs)
  34 {
  35         model->handle_interrupt(regs, ctr);
  36 }
  37
  38 static void op_powerpc_cpu_setup(void *dummy)
  39 {
  40         int ret;
  41
  42         ret = model->cpu_setup(ctr);
  43
  44         if (ret != 0)
  45                 op_per_cpu_rc = ret;
  46 }
  47
  48 static int op_powerpc_setup(void)
  49 {
  50         int err;
  51
  52         op_per_cpu_rc = 0;
  53
  54         /* Grab the hardware */
  55         err = reserve_pmc_hardware(op_handle_interrupt);
  56         if (err)
  57                 return err;
  58
  59         /* Pre-compute the values to stuff in the hardware registers.  */
  60         op_per_cpu_rc = model->reg_setup(ctr, &sys, model->num_counters);
  61
  62         if (op_per_cpu_rc)
  63                 goto out;
  64
  65         /* Configure the registers on all cpus.  If an error occurs on one
  66          * of the cpus, op_per_cpu_rc will be set to the error */
  67         on_each_cpu(op_powerpc_cpu_setup, NULL, 1);
  68
  69 out:    if (op_per_cpu_rc) {
  70                 /* error on setup release the performance counter hardware */
  71                 release_pmc_hardware();
  72         }
  73
  74         return op_per_cpu_rc;
  75 }
  76
  77 static void op_powerpc_shutdown(void)
  78 {
  79         release_pmc_hardware();
  80 }
  81
  82 static void op_powerpc_cpu_start(void *dummy)
  83 {
  84         /* If any of the cpus have return an error, set the
  85          * global flag to the error so it can be returned
  86          * to the generic OProfile caller.
  87          */
  88         int ret;
  89
  90         ret = model->start(ctr);
  91         if (ret != 0)
  92                 op_per_cpu_rc = ret;
  93 }
  94
  95 static int op_powerpc_start(void)
  96 {
  97         op_per_cpu_rc = 0;
  98
  99         if (model->global_start)
 100                 return model->global_start(ctr);
 101         if (model->start) {
 102                 on_each_cpu(op_powerpc_cpu_start, NULL, 1);
 103                 return op_per_cpu_rc;
 104         }
 105         return -EIO; /* No start function is defined for this
 106                         power architecture */
 107 }
 108
 109 static inline void op_powerpc_cpu_stop(void *dummy)
 110 {
 111         model->stop();
 112 }
 113
 114 static void op_powerpc_stop(void)
 115 {
 116         if (model->stop)
 117                 on_each_cpu(op_powerpc_cpu_stop, NULL, 1);
 118         if (model->global_stop)
 119                 model->global_stop();
 120 }
 121
 122 static int op_powerpc_create_files(struct dentry *root)
 123 {
 124         int i;
 125
 126 #ifdef CONFIG_PPC64
 127         /*
 128          * There is one mmcr0, mmcr1 and mmcra for setting the events for
 129          * all of the counters.
 130          */
 131         oprofilefs_create_ulong(root, "mmcr0", &sys.mmcr0);
 132         oprofilefs_create_ulong(root, "mmcr1", &sys.mmcr1);
 133         oprofilefs_create_ulong(root, "mmcra", &sys.mmcra);
 134 #ifdef CONFIG_OPROFILE_CELL
 135         /* create a file the user tool can check to see what level of profiling
 136          * support exits with this kernel. Initialize bit mask to indicate
 137          * what support the kernel has:
 138          * bit 0      -  Supports SPU event profiling in addition to PPU
 139          *               event and cycles; and SPU cycle profiling
 140          * bits 1-31  -  Currently unused.
 141          *
 142          * If the file does not exist, then the kernel only supports SPU
 143          * cycle profiling, PPU event and cycle profiling.
 144          */
 145         oprofilefs_create_ulong(root, "cell_support", &sys.cell_support);
 146         sys.cell_support = 0x1; /* Note, the user OProfile tool must check
 147                                  * that this bit is set before attempting to
 148                                  * user SPU event profiling.  Older kernels
 149                                  * will not have this file, hence the user
 150                                  * tool is not allowed to do SPU event
 151                                  * profiling on older kernels.  Older kernels
 152                                  * will accept SPU events but collected data
 153                                  * is garbage.
 154                                  */
 155 #endif
 156 #endif
 157
 158         for (i = 0; i < model->num_counters; ++i) {
 159                 struct dentry *dir;
 160                 char buf[4];
 161
 162                 snprintf(buf, sizeof buf, "%d", i);
 163                 dir = oprofilefs_mkdir(root, buf);
 164
 165                 oprofilefs_create_ulong(dir, "enabled", &ctr[i].enabled);
 166                 oprofilefs_create_ulong(dir, "event", &ctr[i].event);
 167                 oprofilefs_create_ulong(dir, "count", &ctr[i].count);
 168
 169                 /*
 170                  * Classic PowerPC doesn't support per-counter
 171                  * control like this, but the options are
 172                  * expected, so they remain.  For Freescale
 173                  * Book-E style performance monitors, we do
 174                  * support them.
 175                  */
 176                 oprofilefs_create_ulong(dir, "kernel", &ctr[i].kernel);
 177                 oprofilefs_create_ulong(dir, "user", &ctr[i].user);
 178
 179                 oprofilefs_create_ulong(dir, "unit_mask", &ctr[i].unit_mask);
 180         }
 181
 182         oprofilefs_create_ulong(root, "enable_kernel", &sys.enable_kernel);
 183         oprofilefs_create_ulong(root, "enable_user", &sys.enable_user);
 184
 185         /* Default to tracing both kernel and user */
 186         sys.enable_kernel = 1;
 187         sys.enable_user = 1;
 188
 189         return 0;
 190 }
 191
 192 int __init oprofile_arch_init(struct oprofile_operations *ops)
 193 {
 194         if (!cur_cpu_spec->oprofile_cpu_type)
 195                 return -ENODEV;
 196
 197         switch (cur_cpu_spec->oprofile_type) {
 198 #ifdef CONFIG_PPC_BOOK3S_64
 199 #ifdef CONFIG_OPROFILE_CELL
 200                 case PPC_OPROFILE_CELL:
 201                         if (firmware_has_feature(FW_FEATURE_LPAR))
 202                                 return -ENODEV;
 203                         model = &op_model_cell;
 204                         ops->sync_start = model->sync_start;
 205                         ops->sync_stop = model->sync_stop;
 206                         break;
 207 #endif
 208                 case PPC_OPROFILE_POWER4:
 209                         model = &op_model_power4;
 210                         break;
 211                 case PPC_OPROFILE_PA6T:
 212                         model = &op_model_pa6t;
 213                         break;
 214 #endif
 215 #ifdef CONFIG_6xx
 216                 case PPC_OPROFILE_G4:
 217                         model = &op_model_7450;
 218                         break;
 219 #endif
 220 #if defined(CONFIG_FSL_EMB_PERFMON)
 221                 case PPC_OPROFILE_FSL_EMB:
 222                         model = &op_model_fsl_emb;
 223                         break;
 224 #endif
 225                 default:
 226                         return -ENODEV;
 227         }
 228
 229         model->num_counters = cur_cpu_spec->num_pmcs;
 230
 231         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
 232         ops->create_files = op_powerpc_create_files;
 233         ops->setup = op_powerpc_setup;
 234         ops->shutdown = op_powerpc_shutdown;
 235         ops->start = op_powerpc_start;
 236         ops->stop = op_powerpc_stop;
 237         ops->backtrace = op_powerpc_backtrace;
 238
 239         printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
 240                ops->cpu_type);
 241
 242         return 0;
 243 }
 244
 245 void oprofile_arch_exit(void)
 246 {
 247 }