kernel/tools/power/cpupower/utils/idle_monitor/hsw_ext_idle.c

   1 /*
   2  *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc.
   3  *
   4  *  Licensed under the terms of the GNU GPL License version 2.
   5  *
   6  *  Based on SandyBridge monitor. Implements the new package C-states
   7  *  (PC8, PC9, PC10) coming with a specific Haswell (family 0x45) CPU.
   8  */
   9
  10 #if defined(__i386__) || defined(__x86_64__)
  11
  12 #include <stdio.h>
  13 #include <stdint.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16
  17 #include "helpers/helpers.h"
  18 #include "idle_monitor/cpupower-monitor.h"
  19
  20 #define MSR_PKG_C8_RESIDENCY           0x00000630
  21 #define MSR_PKG_C9_RESIDENCY           0x00000631
  22 #define MSR_PKG_C10_RESIDENCY          0x00000632
  23
  24 #define MSR_TSC 0x10
  25
  26 enum intel_hsw_ext_id { PC8 = 0, PC9, PC10, HSW_EXT_CSTATE_COUNT,
  27                         TSC = 0xFFFF };
  28
  29 static int hsw_ext_get_count_percent(unsigned int self_id, double *percent,
  30                                  unsigned int cpu);
  31
  32 static cstate_t hsw_ext_cstates[HSW_EXT_CSTATE_COUNT] = {
  33         {
  34                 .name                   = "PC8",
  35                 .desc                   = N_("Processor Package C8"),
  36                 .id                     = PC8,
  37                 .range                  = RANGE_PACKAGE,
  38                 .get_count_percent      = hsw_ext_get_count_percent,
  39         },
  40         {
  41                 .name                   = "PC9",
  42                 .desc                   = N_("Processor Package C9"),
  43                 .desc                   = N_("Processor Package C2"),
  44                 .id                     = PC9,
  45                 .range                  = RANGE_PACKAGE,
  46                 .get_count_percent      = hsw_ext_get_count_percent,
  47         },
  48         {
  49                 .name                   = "PC10",
  50                 .desc                   = N_("Processor Package C10"),
  51                 .id                     = PC10,
  52                 .range                  = RANGE_PACKAGE,
  53                 .get_count_percent      = hsw_ext_get_count_percent,
  54         },
  55 };
  56
  57 static unsigned long long tsc_at_measure_start;
  58 static unsigned long long tsc_at_measure_end;
  59 static unsigned long long *previous_count[HSW_EXT_CSTATE_COUNT];
  60 static unsigned long long *current_count[HSW_EXT_CSTATE_COUNT];
  61 /* valid flag for all CPUs. If a MSR read failed it will be zero */
  62 static int *is_valid;
  63
  64 static int hsw_ext_get_count(enum intel_hsw_ext_id id, unsigned long long *val,
  65                         unsigned int cpu)
  66 {
  67         int msr;
  68
  69         switch (id) {
  70         case PC8:
  71                 msr = MSR_PKG_C8_RESIDENCY;
  72                 break;
  73         case PC9:
  74                 msr = MSR_PKG_C9_RESIDENCY;
  75                 break;
  76         case PC10:
  77                 msr = MSR_PKG_C10_RESIDENCY;
  78                 break;
  79         case TSC:
  80                 msr = MSR_TSC;
  81                 break;
  82         default:
  83                 return -1;
  84         };
  85         if (read_msr(cpu, msr, val))
  86                 return -1;
  87         return 0;
  88 }
  89
  90 static int hsw_ext_get_count_percent(unsigned int id, double *percent,
  91                                  unsigned int cpu)
  92 {
  93         *percent = 0.0;
  94
  95         if (!is_valid[cpu])
  96                 return -1;
  97
  98         *percent = (100.0 *
  99                 (current_count[id][cpu] - previous_count[id][cpu])) /
 100                 (tsc_at_measure_end - tsc_at_measure_start);
 101
 102         dprint("%s: previous: %llu - current: %llu - (%u)\n",
 103                 hsw_ext_cstates[id].name, previous_count[id][cpu],
 104                 current_count[id][cpu], cpu);
 105
 106         dprint("%s: tsc_diff: %llu - count_diff: %llu - percent: %2.f (%u)\n",
 107                hsw_ext_cstates[id].name,
 108                (unsigned long long) tsc_at_measure_end - tsc_at_measure_start,
 109                current_count[id][cpu] - previous_count[id][cpu],
 110                *percent, cpu);
 111
 112         return 0;
 113 }
 114
 115 static int hsw_ext_start(void)
 116 {
 117         int num, cpu;
 118         unsigned long long val;
 119
 120         for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) {
 121                 for (cpu = 0; cpu < cpu_count; cpu++) {
 122                         hsw_ext_get_count(num, &val, cpu);
 123                         previous_count[num][cpu] = val;
 124                 }
 125         }
 126         hsw_ext_get_count(TSC, &tsc_at_measure_start, 0);
 127         return 0;
 128 }
 129
 130 static int hsw_ext_stop(void)
 131 {
 132         unsigned long long val;
 133         int num, cpu;
 134
 135         hsw_ext_get_count(TSC, &tsc_at_measure_end, 0);
 136
 137         for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) {
 138                 for (cpu = 0; cpu < cpu_count; cpu++) {
 139                         is_valid[cpu] = !hsw_ext_get_count(num, &val, cpu);
 140                         current_count[num][cpu] = val;
 141                 }
 142         }
 143         return 0;
 144 }
 145
 146 struct cpuidle_monitor intel_hsw_ext_monitor;
 147
 148 static struct cpuidle_monitor *hsw_ext_register(void)
 149 {
 150         int num;
 151
 152         if (cpupower_cpu_info.vendor != X86_VENDOR_INTEL
 153             || cpupower_cpu_info.family != 6)
 154                 return NULL;
 155
 156         switch (cpupower_cpu_info.model) {
 157         case 0x45: /* HSW */
 158                 break;
 159         default:
 160                 return NULL;
 161         }
 162
 163         is_valid = calloc(cpu_count, sizeof(int));
 164         for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) {
 165                 previous_count[num] = calloc(cpu_count,
 166                                         sizeof(unsigned long long));
 167                 current_count[num]  = calloc(cpu_count,
 168                                         sizeof(unsigned long long));
 169         }
 170         intel_hsw_ext_monitor.name_len = strlen(intel_hsw_ext_monitor.name);
 171         return &intel_hsw_ext_monitor;
 172 }
 173
 174 void hsw_ext_unregister(void)
 175 {
 176         int num;
 177         free(is_valid);
 178         for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) {
 179                 free(previous_count[num]);
 180                 free(current_count[num]);
 181         }
 182 }
 183
 184 struct cpuidle_monitor intel_hsw_ext_monitor = {
 185         .name                   = "HaswellExtended",
 186         .hw_states              = hsw_ext_cstates,
 187         .hw_states_num          = HSW_EXT_CSTATE_COUNT,
 188         .start                  = hsw_ext_start,
 189         .stop                   = hsw_ext_stop,
 190         .do_register            = hsw_ext_register,
 191         .unregister             = hsw_ext_unregister,
 192         .needs_root             = 1,
 193         .overflow_s             = 922000000 /* 922337203 seconds TSC overflow
 194                                                at 20GHz */
 195 };
 196 #endif /* defined(__i386__) || defined(__x86_64__) */