LXR linux/tools/power/cpupower/utils/helpers/misc.c

   1// SPDX-License-Identifier: GPL-2.0
   2
   3#include <stdio.h>
   4#include <errno.h>
   5#include <stdlib.h>
   6
   7#include "helpers/helpers.h"
   8#include "helpers/sysfs.h"
   9
  10#if defined(__i386__) || defined(__x86_64__)
  11
  12#include "cpupower_intern.h"
  13
  14#define MSR_AMD_HWCR    0xc0010015
  15
  16int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
  17                        int *states)
  18{
  19        int ret;
  20        unsigned long long val;
  21
  22        *support = *active = *states = 0;
  23
  24        if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_CPB) {
  25                *support = 1;
  26
  27                /* AMD Family 0x17 does not utilize PCI D18F4 like prior
  28                 * families and has no fixed discrete boost states but
  29                 * has Hardware determined variable increments instead.
  30                 */
  31
  32                if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_CPB_MSR) {
  33                        if (!read_msr(cpu, MSR_AMD_HWCR, &val)) {
  34                                if (!(val & CPUPOWER_AMD_CPBDIS))
  35                                        *active = 1;
  36                        }
  37                } else {
  38                        ret = amd_pci_get_num_boost_states(active, states);
  39                        if (ret)
  40                                return ret;
  41                }
  42        } else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA)
  43                *support = *active = 1;
  44        return 0;
  45}
  46
  47int cpupower_intel_get_perf_bias(unsigned int cpu)
  48{
  49        char linebuf[MAX_LINE_LEN];
  50        char path[SYSFS_PATH_MAX];
  51        unsigned long val;
  52        char *endp;
  53
  54        if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS))
  55                return -1;
  56
  57        snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/power/energy_perf_bias", cpu);
  58
  59        if (cpupower_read_sysfs(path, linebuf, MAX_LINE_LEN) == 0)
  60                return -1;
  61
  62        val = strtol(linebuf, &endp, 0);
  63        if (endp == linebuf || errno == ERANGE)
  64                return -1;
  65
  66        return val;
  67}
  68
  69int cpupower_intel_set_perf_bias(unsigned int cpu, unsigned int val)
  70{
  71        char path[SYSFS_PATH_MAX];
  72        char linebuf[3] = {};
  73
  74        if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS))
  75                return -1;
  76
  77        snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/power/energy_perf_bias", cpu);
  78        snprintf(linebuf, sizeof(linebuf), "%d", val);
  79
  80        if (cpupower_write_sysfs(path, linebuf, 3) <= 0)
  81                return -1;
  82
  83        return 0;
  84}
  85
  86#endif /* #if defined(__i386__) || defined(__x86_64__) */
  87
  88/* get_cpustate
  89 *
  90 * Gather the information of all online CPUs into bitmask struct
  91 */
  92void get_cpustate(void)
  93{
  94        unsigned int cpu = 0;
  95
  96        bitmask_clearall(online_cpus);
  97        bitmask_clearall(offline_cpus);
  98
  99        for (cpu = bitmask_first(cpus_chosen);
 100                cpu <= bitmask_last(cpus_chosen); cpu++) {
 101
 102                if (cpupower_is_cpu_online(cpu) == 1)
 103                        bitmask_setbit(online_cpus, cpu);
 104                else
 105                        bitmask_setbit(offline_cpus, cpu);
 106
 107                continue;
 108        }
 109}
 110
 111/* print_online_cpus
 112 *
 113 * Print the CPU numbers of all CPUs that are online currently
 114 */
 115void print_online_cpus(void)
 116{
 117        int str_len = 0;
 118        char *online_cpus_str = NULL;
 119
 120        str_len = online_cpus->size * 5;
 121        online_cpus_str = (void *)malloc(sizeof(char) * str_len);
 122
 123        if (!bitmask_isallclear(online_cpus)) {
 124                bitmask_displaylist(online_cpus_str, str_len, online_cpus);
 125                printf(_("Following CPUs are online:\n%s\n"), online_cpus_str);
 126        }
 127}
 128
 129/* print_offline_cpus
 130 *
 131 * Print the CPU numbers of all CPUs that are offline currently
 132 */
 133void print_offline_cpus(void)
 134{
 135        int str_len = 0;
 136        char *offline_cpus_str = NULL;
 137
 138        str_len = offline_cpus->size * 5;
 139        offline_cpus_str = (void *)malloc(sizeof(char) * str_len);
 140
 141        if (!bitmask_isallclear(offline_cpus)) {
 142                bitmask_displaylist(offline_cpus_str, str_len, offline_cpus);
 143                printf(_("Following CPUs are offline:\n%s\n"), offline_cpus_str);
 144                printf(_("cpupower set operation was not performed on them\n"));
 145        }
 146}
 147