arch/powerpc/oprofile/op_model_fsl_emb.c

   1 /*
   2  * Freescale Embedded oprofile support, based on ppc64 oprofile support
   3  * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
   4  *
   5  * Copyright (c) 2004, 2010 Freescale Semiconductor, Inc
   6  *
   7  * Author: Andy Fleming
   8  * Maintainer: Kumar Gala <galak@kernel.crashing.org>
   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 <asm/ptrace.h>
  20 #include <asm/system.h>
  21 #include <asm/processor.h>
  22 #include <asm/cputable.h>
  23 #include <asm/reg_fsl_emb.h>
  24 #include <asm/page.h>
  25 #include <asm/pmc.h>
  26 #include <asm/oprofile_impl.h>
  27
  28 static unsigned long reset_value[OP_MAX_COUNTER];
  29
  30 static int num_counters;
  31 static int oprofile_running;
  32
  33 static inline u32 get_pmlca(int ctr)
  34 {
  35         u32 pmlca;
  36
  37         switch (ctr) {
  38                 case 0:
  39                         pmlca = mfpmr(PMRN_PMLCA0);
  40                         break;
  41                 case 1:
  42                         pmlca = mfpmr(PMRN_PMLCA1);
  43                         break;
  44                 case 2:
  45                         pmlca = mfpmr(PMRN_PMLCA2);
  46                         break;
  47                 case 3:
  48                         pmlca = mfpmr(PMRN_PMLCA3);
  49                         break;
  50                 default:
  51                         panic("Bad ctr number\n");
  52         }
  53
  54         return pmlca;
  55 }
  56
  57 static inline void set_pmlca(int ctr, u32 pmlca)
  58 {
  59         switch (ctr) {
  60                 case 0:
  61                         mtpmr(PMRN_PMLCA0, pmlca);
  62                         break;
  63                 case 1:
  64                         mtpmr(PMRN_PMLCA1, pmlca);
  65                         break;
  66                 case 2:
  67                         mtpmr(PMRN_PMLCA2, pmlca);
  68                         break;
  69                 case 3:
  70                         mtpmr(PMRN_PMLCA3, pmlca);
  71                         break;
  72                 default:
  73                         panic("Bad ctr number\n");
  74         }
  75 }
  76
  77 static inline unsigned int ctr_read(unsigned int i)
  78 {
  79         switch(i) {
  80                 case 0:
  81                         return mfpmr(PMRN_PMC0);
  82                 case 1:
  83                         return mfpmr(PMRN_PMC1);
  84                 case 2:
  85                         return mfpmr(PMRN_PMC2);
  86                 case 3:
  87                         return mfpmr(PMRN_PMC3);
  88                 default:
  89                         return 0;
  90         }
  91 }
  92
  93 static inline void ctr_write(unsigned int i, unsigned int val)
  94 {
  95         switch(i) {
  96                 case 0:
  97                         mtpmr(PMRN_PMC0, val);
  98                         break;
  99                 case 1:
 100                         mtpmr(PMRN_PMC1, val);
 101                         break;
 102                 case 2:
 103                         mtpmr(PMRN_PMC2, val);
 104                         break;
 105                 case 3:
 106                         mtpmr(PMRN_PMC3, val);
 107                         break;
 108                 default:
 109                         break;
 110         }
 111 }
 112
 113
 114 static void init_pmc_stop(int ctr)
 115 {
 116         u32 pmlca = (PMLCA_FC | PMLCA_FCS | PMLCA_FCU |
 117                         PMLCA_FCM1 | PMLCA_FCM0);
 118         u32 pmlcb = 0;
 119
 120         switch (ctr) {
 121                 case 0:
 122                         mtpmr(PMRN_PMLCA0, pmlca);
 123                         mtpmr(PMRN_PMLCB0, pmlcb);
 124                         break;
 125                 case 1:
 126                         mtpmr(PMRN_PMLCA1, pmlca);
 127                         mtpmr(PMRN_PMLCB1, pmlcb);
 128                         break;
 129                 case 2:
 130                         mtpmr(PMRN_PMLCA2, pmlca);
 131                         mtpmr(PMRN_PMLCB2, pmlcb);
 132                         break;
 133                 case 3:
 134                         mtpmr(PMRN_PMLCA3, pmlca);
 135                         mtpmr(PMRN_PMLCB3, pmlcb);
 136                         break;
 137                 default:
 138                         panic("Bad ctr number!\n");
 139         }
 140 }
 141
 142 static void set_pmc_event(int ctr, int event)
 143 {
 144         u32 pmlca;
 145
 146         pmlca = get_pmlca(ctr);
 147
 148         pmlca = (pmlca & ~PMLCA_EVENT_MASK) |
 149                 ((event << PMLCA_EVENT_SHIFT) &
 150                  PMLCA_EVENT_MASK);
 151
 152         set_pmlca(ctr, pmlca);
 153 }
 154
 155 static void set_pmc_user_kernel(int ctr, int user, int kernel)
 156 {
 157         u32 pmlca;
 158
 159         pmlca = get_pmlca(ctr);
 160
 161         if(user)
 162                 pmlca &= ~PMLCA_FCU;
 163         else
 164                 pmlca |= PMLCA_FCU;
 165
 166         if(kernel)
 167                 pmlca &= ~PMLCA_FCS;
 168         else
 169                 pmlca |= PMLCA_FCS;
 170
 171         set_pmlca(ctr, pmlca);
 172 }
 173
 174 static void set_pmc_marked(int ctr, int mark0, int mark1)
 175 {
 176         u32 pmlca = get_pmlca(ctr);
 177
 178         if(mark0)
 179                 pmlca &= ~PMLCA_FCM0;
 180         else
 181                 pmlca |= PMLCA_FCM0;
 182
 183         if(mark1)
 184                 pmlca &= ~PMLCA_FCM1;
 185         else
 186                 pmlca |= PMLCA_FCM1;
 187
 188         set_pmlca(ctr, pmlca);
 189 }
 190
 191 static void pmc_start_ctr(int ctr, int enable)
 192 {
 193         u32 pmlca = get_pmlca(ctr);
 194
 195         pmlca &= ~PMLCA_FC;
 196
 197         if (enable)
 198                 pmlca |= PMLCA_CE;
 199         else
 200                 pmlca &= ~PMLCA_CE;
 201
 202         set_pmlca(ctr, pmlca);
 203 }
 204
 205 static void pmc_start_ctrs(int enable)
 206 {
 207         u32 pmgc0 = mfpmr(PMRN_PMGC0);
 208
 209         pmgc0 &= ~PMGC0_FAC;
 210         pmgc0 |= PMGC0_FCECE;
 211
 212         if (enable)
 213                 pmgc0 |= PMGC0_PMIE;
 214         else
 215                 pmgc0 &= ~PMGC0_PMIE;
 216
 217         mtpmr(PMRN_PMGC0, pmgc0);
 218 }
 219
 220 static void pmc_stop_ctrs(void)
 221 {
 222         u32 pmgc0 = mfpmr(PMRN_PMGC0);
 223
 224         pmgc0 |= PMGC0_FAC;
 225
 226         pmgc0 &= ~(PMGC0_PMIE | PMGC0_FCECE);
 227
 228         mtpmr(PMRN_PMGC0, pmgc0);
 229 }
 230
 231 static int fsl_emb_cpu_setup(struct op_counter_config *ctr)
 232 {
 233         int i;
 234
 235         /* freeze all counters */
 236         pmc_stop_ctrs();
 237
 238         for (i = 0;i < num_counters;i++) {
 239                 init_pmc_stop(i);
 240
 241                 set_pmc_event(i, ctr[i].event);
 242
 243                 set_pmc_user_kernel(i, ctr[i].user, ctr[i].kernel);
 244         }
 245
 246         return 0;
 247 }
 248
 249 static int fsl_emb_reg_setup(struct op_counter_config *ctr,
 250                              struct op_system_config *sys,
 251                              int num_ctrs)
 252 {
 253         int i;
 254
 255         num_counters = num_ctrs;
 256
 257         /* Our counters count up, and "count" refers to
 258          * how much before the next interrupt, and we interrupt
 259          * on overflow.  So we calculate the starting value
 260          * which will give us "count" until overflow.
 261          * Then we set the events on the enabled counters */
 262         for (i = 0; i < num_counters; ++i)
 263                 reset_value[i] = 0x80000000UL - ctr[i].count;
 264
 265         return 0;
 266 }
 267
 268 static int fsl_emb_start(struct op_counter_config *ctr)
 269 {
 270         int i;
 271
 272         mtmsr(mfmsr() | MSR_PMM);
 273
 274         for (i = 0; i < num_counters; ++i) {
 275                 if (ctr[i].enabled) {
 276                         ctr_write(i, reset_value[i]);
 277                         /* Set each enabled counter to only
 278                          * count when the Mark bit is *not* set */
 279                         set_pmc_marked(i, 1, 0);
 280                         pmc_start_ctr(i, 1);
 281                 } else {
 282                         ctr_write(i, 0);
 283
 284                         /* Set the ctr to be stopped */
 285                         pmc_start_ctr(i, 0);
 286                 }
 287         }
 288
 289         /* Clear the freeze bit, and enable the interrupt.
 290          * The counters won't actually start until the rfi clears
 291          * the PMM bit */
 292         pmc_start_ctrs(1);
 293
 294         oprofile_running = 1;
 295
 296         pr_debug("start on cpu %d, pmgc0 %x\n", smp_processor_id(),
 297                         mfpmr(PMRN_PMGC0));
 298
 299         return 0;
 300 }
 301
 302 static void fsl_emb_stop(void)
 303 {
 304         /* freeze counters */
 305         pmc_stop_ctrs();
 306
 307         oprofile_running = 0;
 308
 309         pr_debug("stop on cpu %d, pmgc0 %x\n", smp_processor_id(),
 310                         mfpmr(PMRN_PMGC0));
 311
 312         mb();
 313 }
 314
 315
 316 static void fsl_emb_handle_interrupt(struct pt_regs *regs,
 317                                     struct op_counter_config *ctr)
 318 {
 319         unsigned long pc;
 320         int is_kernel;
 321         int val;
 322         int i;
 323
 324         pc = regs->nip;
 325         is_kernel = is_kernel_addr(pc);
 326
 327         for (i = 0; i < num_counters; ++i) {
 328                 val = ctr_read(i);
 329                 if (val < 0) {
 330                         if (oprofile_running && ctr[i].enabled) {
 331                                 oprofile_add_ext_sample(pc, regs, i, is_kernel);
 332                                 ctr_write(i, reset_value[i]);
 333                         } else {
 334                                 ctr_write(i, 0);
 335                         }
 336                 }
 337         }
 338
 339         /* The freeze bit was set by the interrupt. */
 340         /* Clear the freeze bit, and reenable the interrupt.  The
 341          * counters won't actually start until the rfi clears the PMM
 342          * bit.  The PMM bit should not be set until after the interrupt
 343          * is cleared to avoid it getting lost in some hypervisor
 344          * environments.
 345          */
 346         mtmsr(mfmsr() | MSR_PMM);
 347         pmc_start_ctrs(1);
 348 }
 349
 350 struct op_powerpc_model op_model_fsl_emb = {
 351         .reg_setup              = fsl_emb_reg_setup,
 352         .cpu_setup              = fsl_emb_cpu_setup,
 353         .start                  = fsl_emb_start,
 354         .stop                   = fsl_emb_stop,
 355         .handle_interrupt       = fsl_emb_handle_interrupt,
 356 };