arch/powerpc/oprofile/op_model_rs64.c

   1 /*
   2  * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <linux/oprofile.h>
  11 #include <linux/init.h>
  12 #include <linux/smp.h>
  13 #include <asm/ptrace.h>
  14 #include <asm/system.h>
  15 #include <asm/processor.h>
  16 #include <asm/cputable.h>
  17 #include <asm/oprofile_impl.h>
  18
  19 #define dbg(args...)
  20
  21 static void ctrl_write(unsigned int i, unsigned int val)
  22 {
  23         unsigned int tmp = 0;
  24         unsigned long shift = 0, mask = 0;
  25
  26         dbg("ctrl_write %d %x\n", i, val);
  27
  28         switch(i) {
  29         case 0:
  30                 tmp = mfspr(SPRN_MMCR0);
  31                 shift = 6;
  32                 mask = 0x7F;
  33                 break;
  34         case 1:
  35                 tmp = mfspr(SPRN_MMCR0);
  36                 shift = 0;
  37                 mask = 0x3F;
  38                 break;
  39         case 2:
  40                 tmp = mfspr(SPRN_MMCR1);
  41                 shift = 31 - 4;
  42                 mask = 0x1F;
  43                 break;
  44         case 3:
  45                 tmp = mfspr(SPRN_MMCR1);
  46                 shift = 31 - 9;
  47                 mask = 0x1F;
  48                 break;
  49         case 4:
  50                 tmp = mfspr(SPRN_MMCR1);
  51                 shift = 31 - 14;
  52                 mask = 0x1F;
  53                 break;
  54         case 5:
  55                 tmp = mfspr(SPRN_MMCR1);
  56                 shift = 31 - 19;
  57                 mask = 0x1F;
  58                 break;
  59         case 6:
  60                 tmp = mfspr(SPRN_MMCR1);
  61                 shift = 31 - 24;
  62                 mask = 0x1F;
  63                 break;
  64         case 7:
  65                 tmp = mfspr(SPRN_MMCR1);
  66                 shift = 31 - 28;
  67                 mask = 0xF;
  68                 break;
  69         }
  70
  71         tmp = tmp & ~(mask << shift);
  72         tmp |= val << shift;
  73
  74         switch(i) {
  75                 case 0:
  76                 case 1:
  77                         mtspr(SPRN_MMCR0, tmp);
  78                         break;
  79                 default:
  80                         mtspr(SPRN_MMCR1, tmp);
  81         }
  82
  83         dbg("ctrl_write mmcr0 %lx mmcr1 %lx\n", mfspr(SPRN_MMCR0),
  84                mfspr(SPRN_MMCR1));
  85 }
  86
  87 static unsigned long reset_value[OP_MAX_COUNTER];
  88
  89 static int num_counters;
  90
  91 static int rs64_reg_setup(struct op_counter_config *ctr,
  92                            struct op_system_config *sys,
  93                            int num_ctrs)
  94 {
  95         int i;
  96
  97         num_counters = num_ctrs;
  98
  99         for (i = 0; i < num_counters; ++i)
 100                 reset_value[i] = 0x80000000UL - ctr[i].count;
 101
 102         /* XXX setup user and kernel profiling */
 103         return 0;
 104 }
 105
 106 static int rs64_cpu_setup(struct op_counter_config *ctr)
 107 {
 108         unsigned int mmcr0;
 109
 110         /* reset MMCR0 and set the freeze bit */
 111         mmcr0 = MMCR0_FC;
 112         mtspr(SPRN_MMCR0, mmcr0);
 113
 114         /* reset MMCR1, MMCRA */
 115         mtspr(SPRN_MMCR1, 0);
 116
 117         if (cpu_has_feature(CPU_FTR_MMCRA))
 118                 mtspr(SPRN_MMCRA, 0);
 119
 120         mmcr0 |= MMCR0_FCM1|MMCR0_PMXE|MMCR0_FCECE;
 121         /* Only applies to POWER3, but should be safe on RS64 */
 122         mmcr0 |= MMCR0_PMC1CE|MMCR0_PMCjCE;
 123         mtspr(SPRN_MMCR0, mmcr0);
 124
 125         dbg("setup on cpu %d, mmcr0 %lx\n", smp_processor_id(),
 126             mfspr(SPRN_MMCR0));
 127         dbg("setup on cpu %d, mmcr1 %lx\n", smp_processor_id(),
 128             mfspr(SPRN_MMCR1));
 129
 130         return 0;
 131 }
 132
 133 static int rs64_start(struct op_counter_config *ctr)
 134 {
 135         int i;
 136         unsigned int mmcr0;
 137
 138         /* set the PMM bit (see comment below) */
 139         mtmsrd(mfmsr() | MSR_PMM);
 140
 141         for (i = 0; i < num_counters; ++i) {
 142                 if (ctr[i].enabled) {
 143                         classic_ctr_write(i, reset_value[i]);
 144                         ctrl_write(i, ctr[i].event);
 145                 } else {
 146                         classic_ctr_write(i, 0);
 147                 }
 148         }
 149
 150         mmcr0 = mfspr(SPRN_MMCR0);
 151
 152         /*
 153          * now clear the freeze bit, counting will not start until we
 154          * rfid from this excetion, because only at that point will
 155          * the PMM bit be cleared
 156          */
 157         mmcr0 &= ~MMCR0_FC;
 158         mtspr(SPRN_MMCR0, mmcr0);
 159
 160         dbg("start on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
 161         return 0;
 162 }
 163
 164 static void rs64_stop(void)
 165 {
 166         unsigned int mmcr0;
 167
 168         /* freeze counters */
 169         mmcr0 = mfspr(SPRN_MMCR0);
 170         mmcr0 |= MMCR0_FC;
 171         mtspr(SPRN_MMCR0, mmcr0);
 172
 173         dbg("stop on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
 174
 175         mb();
 176 }
 177
 178 static void rs64_handle_interrupt(struct pt_regs *regs,
 179                                   struct op_counter_config *ctr)
 180 {
 181         unsigned int mmcr0;
 182         int is_kernel;
 183         int val;
 184         int i;
 185         unsigned long pc = mfspr(SPRN_SIAR);
 186
 187         is_kernel = is_kernel_addr(pc);
 188
 189         /* set the PMM bit (see comment below) */
 190         mtmsrd(mfmsr() | MSR_PMM);
 191
 192         for (i = 0; i < num_counters; ++i) {
 193                 val = classic_ctr_read(i);
 194                 if (val < 0) {
 195                         if (ctr[i].enabled) {
 196                                 oprofile_add_ext_sample(pc, regs, i, is_kernel);
 197                                 classic_ctr_write(i, reset_value[i]);
 198                         } else {
 199                                 classic_ctr_write(i, 0);
 200                         }
 201                 }
 202         }
 203
 204         mmcr0 = mfspr(SPRN_MMCR0);
 205
 206         /* reset the perfmon trigger */
 207         mmcr0 |= MMCR0_PMXE;
 208
 209         /*
 210          * now clear the freeze bit, counting will not start until we
 211          * rfid from this exception, because only at that point will
 212          * the PMM bit be cleared
 213          */
 214         mmcr0 &= ~MMCR0_FC;
 215         mtspr(SPRN_MMCR0, mmcr0);
 216 }
 217
 218 struct op_powerpc_model op_model_rs64 = {
 219         .reg_setup              = rs64_reg_setup,
 220         .cpu_setup              = rs64_cpu_setup,
 221         .start                  = rs64_start,
 222         .stop                   = rs64_stop,
 223         .handle_interrupt       = rs64_handle_interrupt,
 224 };