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