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Diffstat (limited to 'tools/power/cpupower/utils/helpers/amd.c')
| -rw-r--r-- | tools/power/cpupower/utils/helpers/amd.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/helpers/amd.c b/tools/power/cpupower/utils/helpers/amd.c new file mode 100644 index 000000000..c519cc89c --- /dev/null +++ b/tools/power/cpupower/utils/helpers/amd.c @@ -0,0 +1,226 @@ +// SPDX-License-Identifier: GPL-2.0 +#if defined(__i386__) || defined(__x86_64__) +#include <unistd.h> +#include <errno.h> +#include <stdio.h> +#include <stdint.h> + +#include <pci/pci.h> + +#include "helpers/helpers.h" +#include "cpufreq.h" +#include "acpi_cppc.h" + +/* ACPI P-States Helper Functions for AMD Processors ***************/ +#define MSR_AMD_PSTATE_STATUS 0xc0010063 +#define MSR_AMD_PSTATE 0xc0010064 +#define MSR_AMD_PSTATE_LIMIT 0xc0010061 + +union core_pstate { + /* pre fam 17h: */ + struct { + unsigned fid:6; + unsigned did:3; + unsigned vid:7; + unsigned res1:6; + unsigned nbdid:1; + unsigned res2:2; + unsigned nbvid:7; + unsigned iddval:8; + unsigned idddiv:2; + unsigned res3:21; + unsigned en:1; + } pstate; + /* since fam 17h: */ + struct { + unsigned fid:8; + unsigned did:6; + unsigned vid:8; + unsigned iddval:8; + unsigned idddiv:2; + unsigned res1:31; + unsigned en:1; + } pstatedef; + unsigned long long val; +}; + +static int get_did(union core_pstate pstate) +{ + int t; + + if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATEDEF) + t = pstate.pstatedef.did; + else if (cpupower_cpu_info.family == 0x12) + t = pstate.val & 0xf; + else + t = pstate.pstate.did; + + return t; +} + +static int get_cof(union core_pstate pstate) +{ + int t; + int fid, did, cof; + + did = get_did(pstate); + if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATEDEF) { + fid = pstate.pstatedef.fid; + cof = 200 * fid / did; + } else { + t = 0x10; + fid = pstate.pstate.fid; + if (cpupower_cpu_info.family == 0x11) + t = 0x8; + cof = (100 * (fid + t)) >> did; + } + return cof; +} + +/* Needs: + * cpu -> the cpu that gets evaluated + * boost_states -> how much boost states the machines support + * + * Fills up: + * pstates -> a pointer to an array of size MAX_HW_PSTATES + * must be initialized with zeros. + * All available HW pstates (including boost states) + * no -> amount of pstates above array got filled up with + * + * returns zero on success, -1 on failure + */ +int decode_pstates(unsigned int cpu, int boost_states, + unsigned long *pstates, int *no) +{ + int i, psmax; + union core_pstate pstate; + unsigned long long val; + + /* Only read out frequencies from HW if HW Pstate is supported, + * otherwise frequencies are exported via ACPI tables. + */ + if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_HW_PSTATE)) + return -1; + + if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val)) + return -1; + + psmax = (val >> 4) & 0x7; + psmax += boost_states; + for (i = 0; i <= psmax; i++) { + if (i >= MAX_HW_PSTATES) { + fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n", + psmax, MAX_HW_PSTATES); + return -1; + } + if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val)) + return -1; + + /* The enabled bit (bit 63) is common for all families */ + if (!pstate.pstatedef.en) + continue; + + pstates[i] = get_cof(pstate); + } + *no = i; + return 0; +} + +int amd_pci_get_num_boost_states(int *active, int *states) +{ + struct pci_access *pci_acc; + struct pci_dev *device; + uint8_t val = 0; + + *active = *states = 0; + + device = pci_slot_func_init(&pci_acc, 0x18, 4); + + if (device == NULL) + return -ENODEV; + + val = pci_read_byte(device, 0x15c); + if (val & 3) + *active = 1; + else + *active = 0; + *states = (val >> 2) & 7; + + pci_cleanup(pci_acc); + return 0; +} + +/* ACPI P-States Helper Functions for AMD Processors ***************/ + +/* AMD P-State Helper Functions ************************************/ +enum amd_pstate_value { + AMD_PSTATE_HIGHEST_PERF, + AMD_PSTATE_MAX_FREQ, + AMD_PSTATE_LOWEST_NONLINEAR_FREQ, + MAX_AMD_PSTATE_VALUE_READ_FILES, +}; + +static const char *amd_pstate_value_files[MAX_AMD_PSTATE_VALUE_READ_FILES] = { + [AMD_PSTATE_HIGHEST_PERF] = "amd_pstate_highest_perf", + [AMD_PSTATE_MAX_FREQ] = "amd_pstate_max_freq", + [AMD_PSTATE_LOWEST_NONLINEAR_FREQ] = "amd_pstate_lowest_nonlinear_freq", +}; + +static unsigned long amd_pstate_get_data(unsigned int cpu, + enum amd_pstate_value value) +{ + return cpufreq_get_sysfs_value_from_table(cpu, + amd_pstate_value_files, + value, + MAX_AMD_PSTATE_VALUE_READ_FILES); +} + +void amd_pstate_boost_init(unsigned int cpu, int *support, int *active) +{ + unsigned long highest_perf, nominal_perf, cpuinfo_min, + cpuinfo_max, amd_pstate_max; + + highest_perf = amd_pstate_get_data(cpu, AMD_PSTATE_HIGHEST_PERF); + nominal_perf = acpi_cppc_get_data(cpu, NOMINAL_PERF); + + *support = highest_perf > nominal_perf ? 1 : 0; + if (!(*support)) + return; + + cpufreq_get_hardware_limits(cpu, &cpuinfo_min, &cpuinfo_max); + amd_pstate_max = amd_pstate_get_data(cpu, AMD_PSTATE_MAX_FREQ); + + *active = cpuinfo_max == amd_pstate_max ? 1 : 0; +} + +void amd_pstate_show_perf_and_freq(unsigned int cpu, int no_rounding) +{ + printf(_(" AMD PSTATE Highest Performance: %lu. Maximum Frequency: "), + amd_pstate_get_data(cpu, AMD_PSTATE_HIGHEST_PERF)); + /* + * If boost isn't active, the cpuinfo_max doesn't indicate real max + * frequency. So we read it back from amd-pstate sysfs entry. + */ + print_speed(amd_pstate_get_data(cpu, AMD_PSTATE_MAX_FREQ), no_rounding); + printf(".\n"); + + printf(_(" AMD PSTATE Nominal Performance: %lu. Nominal Frequency: "), + acpi_cppc_get_data(cpu, NOMINAL_PERF)); + print_speed(acpi_cppc_get_data(cpu, NOMINAL_FREQ) * 1000, + no_rounding); + printf(".\n"); + + printf(_(" AMD PSTATE Lowest Non-linear Performance: %lu. Lowest Non-linear Frequency: "), + acpi_cppc_get_data(cpu, LOWEST_NONLINEAR_PERF)); + print_speed(amd_pstate_get_data(cpu, AMD_PSTATE_LOWEST_NONLINEAR_FREQ), + no_rounding); + printf(".\n"); + + printf(_(" AMD PSTATE Lowest Performance: %lu. Lowest Frequency: "), + acpi_cppc_get_data(cpu, LOWEST_PERF)); + print_speed(acpi_cppc_get_data(cpu, LOWEST_FREQ) * 1000, no_rounding); + printf(".\n"); +} + +/* AMD P-State Helper Functions ************************************/ +#endif /* defined(__i386__) || defined(__x86_64__) */ |