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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #if defined(__i386__) || defined(__x86_64__)
   3
   4 #include "helpers/helpers.h"
   5
   6 #define MSR_AMD_HWCR    0xc0010015
   7
   8 int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
   9                         int *states)
  10 {
  11         struct cpupower_cpu_info cpu_info;
  12         int ret;
  13         unsigned long long val;
  14
  15         *support = *active = *states = 0;
  16
  17         ret = get_cpu_info(&cpu_info);
  18         if (ret)
  19                 return ret;
  20
  21         if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_CBP) {
  22                 *support = 1;
  23
  24                 /* AMD Family 0x17 does not utilize PCI D18F4 like prior
  25                  * families and has no fixed discrete boost states but
  26                  * has Hardware determined variable increments instead.
  27                  */
  28
  29                 if (cpu_info.family == 0x17 || cpu_info.family == 0x18) {
  30                         if (!read_msr(cpu, MSR_AMD_HWCR, &val)) {
  31                                 if (!(val & CPUPOWER_AMD_CPBDIS))
  32                                         *active = 1;
  33                         }
  34                 } else {
  35                         ret = amd_pci_get_num_boost_states(active, states);
  36                         if (ret)
  37                                 return ret;
  38                 }
  39         } else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA)
  40                 *support = *active = 1;
  41         return 0;
  42 }
  43 #endif /* #if defined(__i386__) || defined(__x86_64__) */