arch/powerpc/oprofile/op_model_7450.c

   1 /*
   2  * arch/powerpc/oprofile/op_model_7450.c
   3  *
   4  * Freescale 745x/744x oprofile support, based on fsl_booke 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/page.h>
  26 #include <asm/pmc.h>
  27 #include <asm/oprofile_impl.h>
  28
  29 static unsigned long reset_value[OP_MAX_COUNTER];
  30
  31 static int oprofile_running;
  32 static u32 mmcr0_val, mmcr1_val, mmcr2_val, num_pmcs;
  33
  34 #define MMCR0_PMC1_SHIFT        6
  35 #define MMCR0_PMC2_SHIFT        0
  36 #define MMCR1_PMC3_SHIFT        27
  37 #define MMCR1_PMC4_SHIFT        22
  38 #define MMCR1_PMC5_SHIFT        17
  39 #define MMCR1_PMC6_SHIFT        11
  40
  41 #define mmcr0_event1(event) \
  42         ((event << MMCR0_PMC1_SHIFT) & MMCR0_PMC1SEL)
  43 #define mmcr0_event2(event) \
  44         ((event << MMCR0_PMC2_SHIFT) & MMCR0_PMC2SEL)
  45
  46 #define mmcr1_event3(event) \
  47         ((event << MMCR1_PMC3_SHIFT) & MMCR1_PMC3SEL)
  48 #define mmcr1_event4(event) \
  49         ((event << MMCR1_PMC4_SHIFT) & MMCR1_PMC4SEL)
  50 #define mmcr1_event5(event) \
  51         ((event << MMCR1_PMC5_SHIFT) & MMCR1_PMC5SEL)
  52 #define mmcr1_event6(event) \
  53         ((event << MMCR1_PMC6_SHIFT) & MMCR1_PMC6SEL)
  54
  55 #define MMCR0_INIT (MMCR0_FC | MMCR0_FCS | MMCR0_FCP | MMCR0_FCM1 | MMCR0_FCM0)
  56
  57 /* Unfreezes the counters on this CPU, enables the interrupt,
  58  * enables the counters to trigger the interrupt, and sets the
  59  * counters to only count when the mark bit is not set.
  60  */
  61 static void pmc_start_ctrs(void)
  62 {
  63         u32 mmcr0 = mfspr(SPRN_MMCR0);
  64
  65         mmcr0 &= ~(MMCR0_FC | MMCR0_FCM0);
  66         mmcr0 |= (MMCR0_FCECE | MMCR0_PMC1CE | MMCR0_PMCnCE | MMCR0_PMXE);
  67
  68         mtspr(SPRN_MMCR0, mmcr0);
  69 }
  70
  71 /* Disables the counters on this CPU, and freezes them */
  72 static void pmc_stop_ctrs(void)
  73 {
  74         u32 mmcr0 = mfspr(SPRN_MMCR0);
  75
  76         mmcr0 |= MMCR0_FC;
  77         mmcr0 &= ~(MMCR0_FCECE | MMCR0_PMC1CE | MMCR0_PMCnCE | MMCR0_PMXE);
  78
  79         mtspr(SPRN_MMCR0, mmcr0);
  80 }
  81
  82 /* Configures the counters on this CPU based on the global
  83  * settings */
  84 static int fsl7450_cpu_setup(struct op_counter_config *ctr)
  85 {
  86         /* freeze all counters */
  87         pmc_stop_ctrs();
  88
  89         mtspr(SPRN_MMCR0, mmcr0_val);
  90         mtspr(SPRN_MMCR1, mmcr1_val);
  91         if (num_pmcs > 4)
  92                 mtspr(SPRN_MMCR2, mmcr2_val);
  93
  94         return 0;
  95 }
  96
  97 /* Configures the global settings for the countes on all CPUs. */
  98 static int fsl7450_reg_setup(struct op_counter_config *ctr,
  99                              struct op_system_config *sys,
 100                              int num_ctrs)
 101 {
 102         int i;
 103
 104         num_pmcs = num_ctrs;
 105         /* Our counters count up, and "count" refers to
 106          * how much before the next interrupt, and we interrupt
 107          * on overflow.  So we calculate the starting value
 108          * which will give us "count" until overflow.
 109          * Then we set the events on the enabled counters */
 110         for (i = 0; i < num_ctrs; ++i)
 111                 reset_value[i] = 0x80000000UL - ctr[i].count;
 112
 113         /* Set events for Counters 1 & 2 */
 114         mmcr0_val = MMCR0_INIT | mmcr0_event1(ctr[0].event)
 115                 | mmcr0_event2(ctr[1].event);
 116
 117         /* Setup user/kernel bits */
 118         if (sys->enable_kernel)
 119                 mmcr0_val &= ~(MMCR0_FCS);
 120
 121         if (sys->enable_user)
 122                 mmcr0_val &= ~(MMCR0_FCP);
 123
 124         /* Set events for Counters 3-6 */
 125         mmcr1_val = mmcr1_event3(ctr[2].event)
 126                 | mmcr1_event4(ctr[3].event);
 127         if (num_ctrs > 4)
 128                 mmcr1_val |= mmcr1_event5(ctr[4].event)
 129                         | mmcr1_event6(ctr[5].event);
 130
 131         mmcr2_val = 0;
 132
 133         return 0;
 134 }
 135
 136 /* Sets the counters on this CPU to the chosen values, and starts them */
 137 static int fsl7450_start(struct op_counter_config *ctr)
 138 {
 139         int i;
 140
 141         mtmsr(mfmsr() | MSR_PMM);
 142
 143         for (i = 0; i < num_pmcs; ++i) {
 144                 if (ctr[i].enabled)
 145                         classic_ctr_write(i, reset_value[i]);
 146                 else
 147                         classic_ctr_write(i, 0);
 148         }
 149
 150         /* Clear the freeze bit, and enable the interrupt.
 151          * The counters won't actually start until the rfi clears
 152          * the PMM bit */
 153         pmc_start_ctrs();
 154
 155         oprofile_running = 1;
 156
 157         return 0;
 158 }
 159
 160 /* Stop the counters on this CPU */
 161 static void fsl7450_stop(void)
 162 {
 163         /* freeze counters */
 164         pmc_stop_ctrs();
 165
 166         oprofile_running = 0;
 167
 168         mb();
 169 }
 170
 171
 172 /* Handle the interrupt on this CPU, and log a sample for each
 173  * event that triggered the interrupt */
 174 static void fsl7450_handle_interrupt(struct pt_regs *regs,
 175                                     struct op_counter_config *ctr)
 176 {
 177         unsigned long pc;
 178         int is_kernel;
 179         int val;
 180         int i;
 181
 182         /* set the PMM bit (see comment below) */
 183         mtmsr(mfmsr() | MSR_PMM);
 184
 185         pc = mfspr(SPRN_SIAR);
 186         is_kernel = is_kernel_addr(pc);
 187
 188         for (i = 0; i < num_pmcs; ++i) {
 189                 val = classic_ctr_read(i);
 190                 if (val < 0) {
 191                         if (oprofile_running && ctr[i].enabled) {
 192                                 oprofile_add_ext_sample(pc, regs, i, is_kernel);
 193                                 classic_ctr_write(i, reset_value[i]);
 194                         } else {
 195                                 classic_ctr_write(i, 0);
 196                         }
 197                 }
 198         }
 199
 200         /* The freeze bit was set by the interrupt. */
 201         /* Clear the freeze bit, and reenable the interrupt.
 202          * The counters won't actually start until the rfi clears
 203          * the PM/M bit */
 204         pmc_start_ctrs();
 205 }
 206
 207 struct op_powerpc_model op_model_7450= {
 208         .reg_setup              = fsl7450_reg_setup,
 209         .cpu_setup              = fsl7450_cpu_setup,
 210         .start                  = fsl7450_start,
 211         .stop                   = fsl7450_stop,
 212         .handle_interrupt       = fsl7450_handle_interrupt,
 213 };