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// 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;
/* since fam 1Ah: */
struct {
unsigned fid:12;
unsigned res1:2;
unsigned vid:8;
unsigned iddval:8;
unsigned idddiv:2;
unsigned res2:31;
unsigned en:1;
} pstatedef2;
unsigned long long val;
};
static int get_did(union core_pstate pstate)
{
int t;
/* Fam 1Ah onward do not use did */
if (cpupower_cpu_info.family >= 0x1A)
return 0;
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 = 0;
did = get_did(pstate);
if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATEDEF) {
if (cpupower_cpu_info.family >= 0x1A) {
fid = pstate.pstatedef2.fid;
if (fid > 0x0f)
cof = (fid * 5);
} else {
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__) */
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