LXR linux/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
   8int 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__) */
  44