tools/power/cpupower/utils/idle_monitor/nhm_idle.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc.
   4  *
   5  *  Based on Len Brown's <lenb@kernel.org> turbostat tool.
   6  */
   7
   8 #if defined(__i386__) || defined(__x86_64__)
   9
  10 #include <stdio.h>
  11 #include <stdint.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14
  15 #include "helpers/helpers.h"
  16 #include "idle_monitor/cpupower-monitor.h"
  17
  18 #define MSR_PKG_C3_RESIDENCY    0x3F8
  19 #define MSR_PKG_C6_RESIDENCY    0x3F9
  20 #define MSR_CORE_C3_RESIDENCY   0x3FC
  21 #define MSR_CORE_C6_RESIDENCY   0x3FD
  22
  23 #define MSR_TSC 0x10
  24
  25 #define NHM_CSTATE_COUNT 4
  26
  27 enum intel_nhm_id { C3 = 0, C6, PC3, PC6, TSC = 0xFFFF };
  28
  29 static int nhm_get_count_percent(unsigned int self_id, double *percent,
  30                                  unsigned int cpu);
  31
  32 static cstate_t nhm_cstates[NHM_CSTATE_COUNT] = {
  33         {
  34                 .name                   = "C3",
  35                 .desc                   = N_("Processor Core C3"),
  36                 .id                     = C3,
  37                 .range                  = RANGE_CORE,
  38                 .get_count_percent      = nhm_get_count_percent,
  39         },
  40         {
  41                 .name                   = "C6",
  42                 .desc                   = N_("Processor Core C6"),
  43                 .id                     = C6,
  44                 .range                  = RANGE_CORE,
  45                 .get_count_percent      = nhm_get_count_percent,
  46         },
  47
  48         {
  49                 .name                   = "PC3",
  50                 .desc                   = N_("Processor Package C3"),
  51                 .id                     = PC3,
  52                 .range                  = RANGE_PACKAGE,
  53                 .get_count_percent      = nhm_get_count_percent,
  54         },
  55         {
  56                 .name                   = "PC6",
  57                 .desc                   = N_("Processor Package C6"),
  58                 .id                     = PC6,
  59                 .range                  = RANGE_PACKAGE,
  60                 .get_count_percent      = nhm_get_count_percent,
  61         },
  62 };
  63
  64 static unsigned long long tsc_at_measure_start;
  65 static unsigned long long tsc_at_measure_end;
  66 static unsigned long long *previous_count[NHM_CSTATE_COUNT];
  67 static unsigned long long *current_count[NHM_CSTATE_COUNT];
  68 /* valid flag for all CPUs. If a MSR read failed it will be zero */
  69 static int *is_valid;
  70
  71 static int nhm_get_count(enum intel_nhm_id id, unsigned long long *val,
  72                         unsigned int cpu)
  73 {
  74         int msr;
  75
  76         switch (id) {
  77         case C3:
  78                 msr = MSR_CORE_C3_RESIDENCY;
  79                 break;
  80         case C6:
  81                 msr = MSR_CORE_C6_RESIDENCY;
  82                 break;
  83         case PC3:
  84                 msr = MSR_PKG_C3_RESIDENCY;
  85                 break;
  86         case PC6:
  87                 msr = MSR_PKG_C6_RESIDENCY;
  88                 break;
  89         case TSC:
  90                 msr = MSR_TSC;
  91                 break;
  92         default:
  93                 return -1;
  94         }
  95         if (read_msr(cpu, msr, val))
  96                 return -1;
  97
  98         return 0;
  99 }
 100
 101 static int nhm_get_count_percent(unsigned int id, double *percent,
 102                                  unsigned int cpu)
 103 {
 104         *percent = 0.0;
 105
 106         if (!is_valid[cpu])
 107                 return -1;
 108
 109         *percent = (100.0 *
 110                 (current_count[id][cpu] - previous_count[id][cpu])) /
 111                 (tsc_at_measure_end - tsc_at_measure_start);
 112
 113         dprint("%s: previous: %llu - current: %llu - (%u)\n",
 114                 nhm_cstates[id].name, previous_count[id][cpu],
 115                 current_count[id][cpu], cpu);
 116
 117         dprint("%s: tsc_diff: %llu - count_diff: %llu - percent: %2.f (%u)\n",
 118                nhm_cstates[id].name,
 119                (unsigned long long) tsc_at_measure_end - tsc_at_measure_start,
 120                current_count[id][cpu] - previous_count[id][cpu],
 121                *percent, cpu);
 122
 123         return 0;
 124 }
 125
 126 static int nhm_start(void)
 127 {
 128         int num, cpu;
 129         unsigned long long dbg, val;
 130
 131         nhm_get_count(TSC, &tsc_at_measure_start, base_cpu);
 132
 133         for (num = 0; num < NHM_CSTATE_COUNT; num++) {
 134                 for (cpu = 0; cpu < cpu_count; cpu++) {
 135                         is_valid[cpu] = !nhm_get_count(num, &val, cpu);
 136                         previous_count[num][cpu] = val;
 137                 }
 138         }
 139         nhm_get_count(TSC, &dbg, base_cpu);
 140         dprint("TSC diff: %llu\n", dbg - tsc_at_measure_start);
 141         return 0;
 142 }
 143
 144 static int nhm_stop(void)
 145 {
 146         unsigned long long val;
 147         unsigned long long dbg;
 148         int num, cpu;
 149
 150         nhm_get_count(TSC, &tsc_at_measure_end, base_cpu);
 151
 152         for (num = 0; num < NHM_CSTATE_COUNT; num++) {
 153                 for (cpu = 0; cpu < cpu_count; cpu++) {
 154                         is_valid[cpu] = !nhm_get_count(num, &val, cpu);
 155                         current_count[num][cpu] = val;
 156                 }
 157         }
 158         nhm_get_count(TSC, &dbg, base_cpu);
 159         dprint("TSC diff: %llu\n", dbg - tsc_at_measure_end);
 160
 161         return 0;
 162 }
 163
 164 struct cpuidle_monitor intel_nhm_monitor;
 165
 166 struct cpuidle_monitor *intel_nhm_register(void)
 167 {
 168         int num;
 169
 170         if (cpupower_cpu_info.vendor != X86_VENDOR_INTEL)
 171                 return NULL;
 172
 173         if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_INV_TSC))
 174                 return NULL;
 175
 176         if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_APERF))
 177                 return NULL;
 178
 179         /* Free this at program termination */
 180         is_valid = calloc(cpu_count, sizeof(int));
 181         for (num = 0; num < NHM_CSTATE_COUNT; num++) {
 182                 previous_count[num] = calloc(cpu_count,
 183                                         sizeof(unsigned long long));
 184                 current_count[num]  = calloc(cpu_count,
 185                                         sizeof(unsigned long long));
 186         }
 187
 188         intel_nhm_monitor.name_len = strlen(intel_nhm_monitor.name);
 189         return &intel_nhm_monitor;
 190 }
 191
 192 void intel_nhm_unregister(void)
 193 {
 194         int num;
 195
 196         for (num = 0; num < NHM_CSTATE_COUNT; num++) {
 197                 free(previous_count[num]);
 198                 free(current_count[num]);
 199         }
 200         free(is_valid);
 201 }
 202
 203 struct cpuidle_monitor intel_nhm_monitor = {
 204         .name                   = "Nehalem",
 205         .hw_states_num          = NHM_CSTATE_COUNT,
 206         .hw_states              = nhm_cstates,
 207         .start                  = nhm_start,
 208         .stop                   = nhm_stop,
 209         .do_register            = intel_nhm_register,
 210         .unregister             = intel_nhm_unregister,
 211         .flags.needs_root       = 1,
 212         .overflow_s             = 922000000 /* 922337203 seconds TSC overflow
 213                                                at 20GHz */
 214 };
 215 #endif