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