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
  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 void op_handle_interrupt(struct pt_regs *regs)
  32 {
  33         model->handle_interrupt(regs, ctr);
  34 }
  35
  36 static int op_powerpc_setup(void)
  37 {
  38         int err;
  39
  40         /* Grab the hardware */
  41         err = reserve_pmc_hardware(op_handle_interrupt);
  42         if (err)
  43                 return err;
  44
  45         /* Pre-compute the values to stuff in the hardware registers.  */
  46         model->reg_setup(ctr, &sys, model->num_counters);
  47
  48         /* Configure the registers on all cpus.  */
  49         on_each_cpu(model->cpu_setup, NULL, 0, 1);
  50
  51         return 0;
  52 }
  53
  54 static void op_powerpc_shutdown(void)
  55 {
  56         release_pmc_hardware();
  57 }
  58
  59 static void op_powerpc_cpu_start(void *dummy)
  60 {
  61         model->start(ctr);
  62 }
  63
  64 static int op_powerpc_start(void)
  65 {
  66         on_each_cpu(op_powerpc_cpu_start, NULL, 0, 1);
  67         return 0;
  68 }
  69
  70 static inline void op_powerpc_cpu_stop(void *dummy)
  71 {
  72         model->stop();
  73 }
  74
  75 static void op_powerpc_stop(void)
  76 {
  77         on_each_cpu(op_powerpc_cpu_stop, NULL, 0, 1);
  78 }
  79
  80 static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
  81 {
  82         int i;
  83
  84 #ifdef CONFIG_PPC64
  85         /*
  86          * There is one mmcr0, mmcr1 and mmcra for setting the events for
  87          * all of the counters.
  88          */
  89         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
  90         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
  91         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
  92 #endif
  93
  94         for (i = 0; i < model->num_counters; ++i) {
  95                 struct dentry *dir;
  96                 char buf[3];
  97
  98                 snprintf(buf, sizeof buf, "%d", i);
  99                 dir = oprofilefs_mkdir(sb, root, buf);
 100
 101                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
 102                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
 103                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
 104
 105                 /*
 106                  * Classic PowerPC doesn't support per-counter
 107                  * control like this, but the options are
 108                  * expected, so they remain.  For Freescale
 109                  * Book-E style performance monitors, we do
 110                  * support them.
 111                  */
 112                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
 113                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
 114
 115                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
 116         }
 117
 118         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
 119         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
 120
 121         /* Default to tracing both kernel and user */
 122         sys.enable_kernel = 1;
 123         sys.enable_user = 1;
 124
 125         return 0;
 126 }
 127
 128 int __init oprofile_arch_init(struct oprofile_operations *ops)
 129 {
 130         if (!cur_cpu_spec->oprofile_cpu_type)
 131                 return -ENODEV;
 132
 133         switch (cur_cpu_spec->oprofile_type) {
 134 #ifdef CONFIG_PPC64
 135                 case PPC_OPROFILE_RS64:
 136                         model = &op_model_rs64;
 137                         break;
 138                 case PPC_OPROFILE_POWER4:
 139                         model = &op_model_power4;
 140                         break;
 141 #else
 142                 case PPC_OPROFILE_G4:
 143                         model = &op_model_7450;
 144                         break;
 145 #endif
 146 #ifdef CONFIG_FSL_BOOKE
 147                 case PPC_OPROFILE_BOOKE:
 148                         model = &op_model_fsl_booke;
 149                         break;
 150 #endif
 151                 default:
 152                         return -ENODEV;
 153         }
 154
 155         model->num_counters = cur_cpu_spec->num_pmcs;
 156
 157         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
 158         ops->create_files = op_powerpc_create_files;
 159         ops->setup = op_powerpc_setup;
 160         ops->shutdown = op_powerpc_shutdown;
 161         ops->start = op_powerpc_start;
 162         ops->stop = op_powerpc_stop;
 163         ops->backtrace = op_powerpc_backtrace;
 164
 165         printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
 166                ops->cpu_type);
 167
 168         return 0;
 169 }
 170
 171 void oprofile_arch_exit(void)
 172 {
 173 }