arch/powerpc/oprofile/op_model_fsl_booke.c

   1 /*
   2  * oprofile/op_model_e500.c
   3  *
   4  * Freescale Book-E oprofile support, based on ppc64 oprofile support
   5  * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
   6  *
   7  * Copyright (c) 2004 Freescale Semiconductor, Inc
   8  *
   9  * Author: Andy Fleming
  10  * Maintainer: Kumar Gala <galak@kernel.crashing.org>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version
  15  * 2 of the License, or (at your option) any later version.
  16  */
  17
  18 #include <linux/oprofile.h>
  19 #include <linux/init.h>
  20 #include <linux/smp.h>
  21 #include <asm/ptrace.h>
  22 #include <asm/system.h>
  23 #include <asm/processor.h>
  24 #include <asm/cputable.h>
  25 #include <asm/reg_booke.h>
  26 #include <asm/page.h>
  27 #include <asm/pmc.h>
  28 #include <asm/oprofile_impl.h>
  29
  30 static unsigned long reset_value[OP_MAX_COUNTER];
  31
  32 static int num_counters;
  33 static int oprofile_running;
  34
  35 static inline unsigned int ctr_read(unsigned int i)
  36 {
  37         switch(i) {
  38                 case 0:
  39                         return mfpmr(PMRN_PMC0);
  40                 case 1:
  41                         return mfpmr(PMRN_PMC1);
  42                 case 2:
  43                         return mfpmr(PMRN_PMC2);
  44                 case 3:
  45                         return mfpmr(PMRN_PMC3);
  46                 default:
  47                         return 0;
  48         }
  49 }
  50
  51 static inline void ctr_write(unsigned int i, unsigned int val)
  52 {
  53         switch(i) {
  54                 case 0:
  55                         mtpmr(PMRN_PMC0, val);
  56                         break;
  57                 case 1:
  58                         mtpmr(PMRN_PMC1, val);
  59                         break;
  60                 case 2:
  61                         mtpmr(PMRN_PMC2, val);
  62                         break;
  63                 case 3:
  64                         mtpmr(PMRN_PMC3, val);
  65                         break;
  66                 default:
  67                         break;
  68         }
  69 }
  70
  71
  72 static void fsl_booke_reg_setup(struct op_counter_config *ctr,
  73                              struct op_system_config *sys,
  74                              int num_ctrs)
  75 {
  76         int i;
  77
  78         num_counters = num_ctrs;
  79
  80         /* freeze all counters */
  81         pmc_stop_ctrs();
  82
  83         /* Our counters count up, and "count" refers to
  84          * how much before the next interrupt, and we interrupt
  85          * on overflow.  So we calculate the starting value
  86          * which will give us "count" until overflow.
  87          * Then we set the events on the enabled counters */
  88         for (i = 0; i < num_counters; ++i) {
  89                 reset_value[i] = 0x80000000UL - ctr[i].count;
  90
  91                 init_pmc_stop(i);
  92
  93                 set_pmc_event(i, ctr[i].event);
  94
  95                 set_pmc_user_kernel(i, ctr[i].user, ctr[i].kernel);
  96         }
  97 }
  98
  99 static void fsl_booke_start(struct op_counter_config *ctr)
 100 {
 101         int i;
 102
 103         mtmsr(mfmsr() | MSR_PMM);
 104
 105         for (i = 0; i < num_counters; ++i) {
 106                 if (ctr[i].enabled) {
 107                         ctr_write(i, reset_value[i]);
 108                         /* Set Each enabled counterd to only
 109                          * count when the Mark bit is not set */
 110                         set_pmc_marked(i, 1, 0);
 111                         pmc_start_ctr(i, 1);
 112                 } else {
 113                         ctr_write(i, 0);
 114
 115                         /* Set the ctr to be stopped */
 116                         pmc_start_ctr(i, 0);
 117                 }
 118         }
 119
 120         /* Clear the freeze bit, and enable the interrupt.
 121          * The counters won't actually start until the rfi clears
 122          * the PMM bit */
 123         pmc_start_ctrs(1);
 124
 125         oprofile_running = 1;
 126
 127         pr_debug("start on cpu %d, pmgc0 %x\n", smp_processor_id(),
 128                         mfpmr(PMRN_PMGC0));
 129 }
 130
 131 static void fsl_booke_stop(void)
 132 {
 133         /* freeze counters */
 134         pmc_stop_ctrs();
 135
 136         oprofile_running = 0;
 137
 138         pr_debug("stop on cpu %d, pmgc0 %x\n", smp_processor_id(),
 139                         mfpmr(PMRN_PMGC0));
 140
 141         mb();
 142 }
 143
 144
 145 static void fsl_booke_handle_interrupt(struct pt_regs *regs,
 146                                     struct op_counter_config *ctr)
 147 {
 148         unsigned long pc;
 149         int is_kernel;
 150         int val;
 151         int i;
 152
 153         /* set the PMM bit (see comment below) */
 154         mtmsr(mfmsr() | MSR_PMM);
 155
 156         pc = regs->nip;
 157         is_kernel = (pc >= KERNELBASE);
 158
 159         for (i = 0; i < num_counters; ++i) {
 160                 val = ctr_read(i);
 161                 if (val < 0) {
 162                         if (oprofile_running && ctr[i].enabled) {
 163                                 oprofile_add_pc(pc, is_kernel, i);
 164                                 ctr_write(i, reset_value[i]);
 165                         } else {
 166                                 ctr_write(i, 0);
 167                         }
 168                 }
 169         }
 170
 171         /* The freeze bit was set by the interrupt. */
 172         /* Clear the freeze bit, and reenable the interrupt.
 173          * The counters won't actually start until the rfi clears
 174          * the PMM bit */
 175         pmc_start_ctrs(1);
 176 }
 177
 178 struct op_powerpc_model op_model_fsl_booke = {
 179         .reg_setup              = fsl_booke_reg_setup,
 180         .start                  = fsl_booke_start,
 181         .stop                   = fsl_booke_stop,
 182         .handle_interrupt       = fsl_booke_handle_interrupt,
 183 };