tools/power/cpupower/utils/idle_monitor/hsw_ext_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 SandyBridge monitor. Implements the new package C-states
   6  *  (PC8, PC9, PC10) coming with a specific Haswell (family 0x45) CPU.
   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_C8_RESIDENCY           0x00000630
  20 #define MSR_PKG_C9_RESIDENCY           0x00000631
  21 #define MSR_PKG_C10_RESIDENCY          0x00000632
  22
  23 #define MSR_TSC 0x10
  24
  25 enum intel_hsw_ext_id { PC8 = 0, PC9, PC10, HSW_EXT_CSTATE_COUNT,
  26                         TSC = 0xFFFF };
  27
  28 static int hsw_ext_get_count_percent(unsigned int self_id, double *percent,
  29                                  unsigned int cpu);
  30
  31 static cstate_t hsw_ext_cstates[HSW_EXT_CSTATE_COUNT] = {
  32         {
  33                 .name                   = "PC8",
  34                 .desc                   = N_("Processor Package C8"),
  35                 .id                     = PC8,
  36                 .range                  = RANGE_PACKAGE,
  37                 .get_count_percent      = hsw_ext_get_count_percent,
  38         },
  39         {
  40                 .name                   = "PC9",
  41                 .desc                   = N_("Processor Package C9"),
  42                 .id                     = PC9,
  43                 .range                  = RANGE_PACKAGE,
  44                 .get_count_percent      = hsw_ext_get_count_percent,
  45         },
  46         {
  47                 .name                   = "PC10",
  48                 .desc                   = N_("Processor Package C10"),
  49                 .id                     = PC10,
  50                 .range                  = RANGE_PACKAGE,
  51                 .get_count_percent      = hsw_ext_get_count_percent,
  52         },
  53 };
  54
  55 static unsigned long long tsc_at_measure_start;
  56 static unsigned long long tsc_at_measure_end;
  57 static unsigned long long *previous_count[HSW_EXT_CSTATE_COUNT];
  58 static unsigned long long *current_count[HSW_EXT_CSTATE_COUNT];
  59 /* valid flag for all CPUs. If a MSR read failed it will be zero */
  60 static int *is_valid;
  61
  62 static int hsw_ext_get_count(enum intel_hsw_ext_id id, unsigned long long *val,
  63                         unsigned int cpu)
  64 {
  65         int msr;
  66
  67         switch (id) {
  68         case PC8:
  69                 msr = MSR_PKG_C8_RESIDENCY;
  70                 break;
  71         case PC9:
  72                 msr = MSR_PKG_C9_RESIDENCY;
  73                 break;
  74         case PC10:
  75                 msr = MSR_PKG_C10_RESIDENCY;
  76                 break;
  77         case TSC:
  78                 msr = MSR_TSC;
  79                 break;
  80         default:
  81                 return -1;
  82         };
  83         if (read_msr(cpu, msr, val))
  84                 return -1;
  85         return 0;
  86 }
  87
  88 static int hsw_ext_get_count_percent(unsigned int id, double *percent,
  89                                  unsigned int cpu)
  90 {
  91         *percent = 0.0;
  92
  93         if (!is_valid[cpu])
  94                 return -1;
  95
  96         *percent = (100.0 *
  97                 (current_count[id][cpu] - previous_count[id][cpu])) /
  98                 (tsc_at_measure_end - tsc_at_measure_start);
  99
 100         dprint("%s: previous: %llu - current: %llu - (%u)\n",
 101                 hsw_ext_cstates[id].name, previous_count[id][cpu],
 102                 current_count[id][cpu], cpu);
 103
 104         dprint("%s: tsc_diff: %llu - count_diff: %llu - percent: %2.f (%u)\n",
 105                hsw_ext_cstates[id].name,
 106                (unsigned long long) tsc_at_measure_end - tsc_at_measure_start,
 107                current_count[id][cpu] - previous_count[id][cpu],
 108                *percent, cpu);
 109
 110         return 0;
 111 }
 112
 113 static int hsw_ext_start(void)
 114 {
 115         int num, cpu;
 116         unsigned long long val;
 117
 118         for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) {
 119                 for (cpu = 0; cpu < cpu_count; cpu++) {
 120                         hsw_ext_get_count(num, &val, cpu);
 121                         previous_count[num][cpu] = val;
 122                 }
 123         }
 124         hsw_ext_get_count(TSC, &tsc_at_measure_start, base_cpu);
 125         return 0;
 126 }
 127
 128 static int hsw_ext_stop(void)
 129 {
 130         unsigned long long val;
 131         int num, cpu;
 132
 133         hsw_ext_get_count(TSC, &tsc_at_measure_end, base_cpu);
 134
 135         for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) {
 136                 for (cpu = 0; cpu < cpu_count; cpu++) {
 137                         is_valid[cpu] = !hsw_ext_get_count(num, &val, cpu);
 138                         current_count[num][cpu] = val;
 139                 }
 140         }
 141         return 0;
 142 }
 143
 144 struct cpuidle_monitor intel_hsw_ext_monitor;
 145
 146 static struct cpuidle_monitor *hsw_ext_register(void)
 147 {
 148         int num;
 149
 150         if (cpupower_cpu_info.vendor != X86_VENDOR_INTEL
 151             || cpupower_cpu_info.family != 6)
 152                 return NULL;
 153
 154         switch (cpupower_cpu_info.model) {
 155         case 0x45: /* HSW */
 156                 break;
 157         default:
 158                 return NULL;
 159         }
 160
 161         is_valid = calloc(cpu_count, sizeof(int));
 162         for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) {
 163                 previous_count[num] = calloc(cpu_count,
 164                                         sizeof(unsigned long long));
 165                 current_count[num]  = calloc(cpu_count,
 166                                         sizeof(unsigned long long));
 167         }
 168         intel_hsw_ext_monitor.name_len = strlen(intel_hsw_ext_monitor.name);
 169         return &intel_hsw_ext_monitor;
 170 }
 171
 172 void hsw_ext_unregister(void)
 173 {
 174         int num;
 175         free(is_valid);
 176         for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) {
 177                 free(previous_count[num]);
 178                 free(current_count[num]);
 179         }
 180 }
 181
 182 struct cpuidle_monitor intel_hsw_ext_monitor = {
 183         .name                   = "HaswellExtended",
 184         .hw_states              = hsw_ext_cstates,
 185         .hw_states_num          = HSW_EXT_CSTATE_COUNT,
 186         .start                  = hsw_ext_start,
 187         .stop                   = hsw_ext_stop,
 188         .do_register            = hsw_ext_register,
 189         .unregister             = hsw_ext_unregister,
 190         .needs_root             = 1,
 191         .overflow_s             = 922000000 /* 922337203 seconds TSC overflow
 192                                                at 20GHz */
 193 };
 194 #endif /* defined(__i386__) || defined(__x86_64__) */