src/gallium/auxiliary/hud/hud_cpufreq.c

   1 /**************************************************************************
   2  *
   3  * Copyright (C) 2016 Steven Toth <stoth@kernellabs.com>
   4  * Copyright (C) 2016 Zodiac Inflight Innovations
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #if HAVE_GALLIUM_EXTRA_HUD
  30
  31 /* Purpose:
  32  * Reading /sys/devices/system/cpu/cpu?/cpufreq/scaling_???_freq
  33  * cpu frequency (KHz), displaying on the HUD in Hz.
  34  */
  35
  36 #include "hud/hud_private.h"
  37 #include "util/list.h"
  38 #include "os/os_time.h"
  39 #include "os/os_thread.h"
  40 #include "util/u_memory.h"
  41 #include <stdio.h>
  42 #include <unistd.h>
  43 #include <dirent.h>
  44 #include <stdlib.h>
  45 #include <errno.h>
  46 #include <inttypes.h>
  47 #include <sys/types.h>
  48 #include <sys/stat.h>
  49
  50 struct cpufreq_info
  51 {
  52    struct list_head list;
  53    int mode; /* CPUFREQ_MINIMUM, CPUFREQ_CURRENT, CPUFREQ_MAXIMUM */
  54    char name[16]; /* EG. cpu0 */
  55    int cpu_index;
  56
  57    /* EG. /sys/devices/system/cpu/cpu?/cpufreq/scaling_cur_freq */
  58    char sysfs_filename[128];
  59    uint64_t KHz;
  60    uint64_t last_time;
  61 };
  62
  63 static int gcpufreq_count = 0;
  64 static struct list_head gcpufreq_list;
  65 static mtx_t gcpufreq_mutex = _MTX_INITIALIZER_NP;
  66
  67 static struct cpufreq_info *
  68 find_cfi_by_index(int cpu_index, int mode)
  69 {
  70    list_for_each_entry(struct cpufreq_info, cfi, &gcpufreq_list, list) {
  71       if (cfi->mode != mode)
  72          continue;
  73       if (cfi->cpu_index == cpu_index)
  74          return cfi;
  75    }
  76    return 0;
  77 }
  78
  79 static int
  80 get_file_value(const char *fn, uint64_t *KHz)
  81 {
  82    FILE *fh = fopen(fn, "r");
  83    if (!fh) {
  84       fprintf(stderr, "%s error: %s\n", fn, strerror(errno));
  85       return -1;
  86    }
  87    int ret = fscanf(fh, "%" PRIu64 "", KHz);
  88    fclose(fh);
  89
  90    return ret;
  91 }
  92
  93 static void
  94 query_cfi_load(struct hud_graph *gr)
  95 {
  96    struct cpufreq_info *cfi = gr->query_data;
  97
  98    uint64_t now = os_time_get();
  99    if (cfi->last_time) {
 100       if (cfi->last_time + gr->pane->period <= now) {
 101          switch (cfi->mode) {
 102          case CPUFREQ_MINIMUM:
 103          case CPUFREQ_CURRENT:
 104          case CPUFREQ_MAXIMUM:
 105             get_file_value(cfi->sysfs_filename, &cfi->KHz);
 106             hud_graph_add_value(gr, (uint64_t)cfi->KHz * 1000);
 107          }
 108          cfi->last_time = now;
 109       }
 110    } else {
 111       /* initialize */
 112       get_file_value(cfi->sysfs_filename, &cfi->KHz);
 113       cfi->last_time = now;
 114    }
 115 }
 116
 117 /**
 118   * Create and initialize a new object for a specific CPU.
 119   * \param  pane  parent context.
 120   * \param  cpu_index  CPU identifier Eg. 0 (CPU0)
 121   * \param  mode  query CPUFREQ_MINIMUM | CURRENT | MAXIMUM statistic.
 122   */
 123 void
 124 hud_cpufreq_graph_install(struct hud_pane *pane, int cpu_index,
 125                            unsigned int mode)
 126 {
 127    struct hud_graph *gr;
 128    struct cpufreq_info *cfi;
 129
 130    int num_cpus = hud_get_num_cpufreq(0);
 131    if (num_cpus <= 0)
 132       return;
 133
 134    cfi = find_cfi_by_index(cpu_index, mode);
 135    if (!cfi)
 136       return;
 137
 138    gr = CALLOC_STRUCT(hud_graph);
 139    if (!gr)
 140       return;
 141
 142    cfi->mode = mode;
 143    switch(cfi->mode) {
 144    case CPUFREQ_MINIMUM:
 145       snprintf(gr->name, sizeof(gr->name), "%s-Min", cfi->name);
 146       break;
 147    case CPUFREQ_CURRENT:
 148       snprintf(gr->name, sizeof(gr->name), "%s-Cur", cfi->name);
 149       break;
 150    case CPUFREQ_MAXIMUM:
 151       snprintf(gr->name, sizeof(gr->name), "%s-Max", cfi->name);
 152       break;
 153    default:
 154       return;
 155    }
 156
 157    gr->query_data = cfi;
 158    gr->query_new_value = query_cfi_load;
 159
 160    hud_pane_add_graph(pane, gr);
 161    hud_pane_set_max_value(pane, 3000000 /* 3 GHz */);
 162 }
 163
 164 static void
 165 add_object(const char *name, const char *fn, int objmode, int cpu_index)
 166 {
 167    struct cpufreq_info *cfi = CALLOC_STRUCT(cpufreq_info);
 168
 169    strcpy(cfi->name, name);
 170    strcpy(cfi->sysfs_filename, fn);
 171    cfi->mode = objmode;
 172    cfi->cpu_index = cpu_index;
 173    list_addtail(&cfi->list, &gcpufreq_list);
 174    gcpufreq_count++;
 175 }
 176
 177 /**
 178   * Initialize internal object arrays and display cpu freq HUD help.
 179   * \param  displayhelp  true if the list of detected cpus should be
 180                          displayed on the console.
 181   * \return  number of detected CPU metrics (CPU count * 3)
 182   */
 183 int
 184 hud_get_num_cpufreq(bool displayhelp)
 185 {
 186    struct dirent *dp;
 187    struct stat stat_buf;
 188    char fn[128];
 189    int cpu_index;
 190
 191    /* Return the number of CPU metrics we support. */
 192    pipe_mutex_lock(gcpufreq_mutex);
 193    if (gcpufreq_count) {
 194       pipe_mutex_unlock(gcpufreq_mutex);
 195       return gcpufreq_count;
 196    }
 197
 198    /* Scan /sys/devices.../cpu, for every object type we support, create
 199     * and persist an object to represent its different metrics.
 200     */
 201    list_inithead(&gcpufreq_list);
 202    DIR *dir = opendir("/sys/devices/system/cpu");
 203    if (!dir) {
 204       pipe_mutex_unlock(gcpufreq_mutex);
 205       return 0;
 206    }
 207
 208    while ((dp = readdir(dir)) != NULL) {
 209
 210       /* Avoid 'lo' and '..' and '.' */
 211       if (strlen(dp->d_name) <= 2)
 212          continue;
 213
 214       if (sscanf(dp->d_name, "cpu%d\n", &cpu_index) != 1)
 215          continue;
 216
 217       char basename[256];
 218       snprintf(basename, sizeof(basename), "/sys/devices/system/cpu/%s", dp->d_name);
 219
 220       snprintf(fn, sizeof(fn), "%s/cpufreq/scaling_cur_freq", basename);
 221       if (stat(fn, &stat_buf) < 0)
 222          continue;
 223
 224       if (!S_ISREG(stat_buf.st_mode))
 225          continue;              /* Not a regular file */
 226
 227       snprintf(fn, sizeof(fn), "%s/cpufreq/scaling_min_freq", basename);
 228       add_object(dp->d_name, fn, CPUFREQ_MINIMUM, cpu_index);
 229
 230       snprintf(fn, sizeof(fn), "%s/cpufreq/scaling_cur_freq", basename);
 231       add_object(dp->d_name, fn, CPUFREQ_CURRENT, cpu_index);
 232
 233       snprintf(fn, sizeof(fn), "%s/cpufreq/scaling_max_freq", basename);
 234       add_object(dp->d_name, fn, CPUFREQ_MAXIMUM, cpu_index);
 235    }
 236    closedir(dir);
 237
 238    if (displayhelp) {
 239       list_for_each_entry(struct cpufreq_info, cfi, &gcpufreq_list, list) {
 240          char line[128];
 241          snprintf(line, sizeof(line), "    cpufreq-%s-%s",
 242                  cfi->mode == CPUFREQ_MINIMUM ? "min" :
 243                  cfi->mode == CPUFREQ_CURRENT ? "cur" :
 244                  cfi->mode == CPUFREQ_MAXIMUM ? "max" : "undefined", cfi->name);
 245
 246          puts(line);
 247       }
 248    }
 249
 250    pipe_mutex_unlock(gcpufreq_mutex);
 251    return gcpufreq_count;
 252 }
 253
 254 #endif /* HAVE_GALLIUM_EXTRA_HUD */