| // 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" | |
| #define MSR_AMD_PSTATE_STATUS 0xc0010063 | |
| #define MSR_AMD_PSTATE 0xc0010064 | |
| #define MSR_AMD_PSTATE_LIMIT 0xc0010061 | |
| union msr_pstate { | |
| 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; | |
| } bits; | |
| struct { | |
| unsigned fid:8; | |
| unsigned did:6; | |
| unsigned vid:8; | |
| unsigned iddval:8; | |
| unsigned idddiv:2; | |
| unsigned res1:30; | |
| unsigned en:1; | |
| } fam17h_bits; | |
| unsigned long long val; | |
| }; | |
| static int get_did(int family, union msr_pstate pstate) | |
| { | |
| int t; | |
| if (family == 0x12) | |
| t = pstate.val & 0xf; | |
| else if (family == 0x17) | |
| t = pstate.fam17h_bits.did; | |
| else | |
| t = pstate.bits.did; | |
| return t; | |
| } | |
| static int get_cof(int family, union msr_pstate pstate) | |
| { | |
| int t; | |
| int fid, did, cof; | |
| did = get_did(family, pstate); | |
| if (family == 0x17) { | |
| fid = pstate.fam17h_bits.fid; | |
| cof = 200 * fid / did; | |
| } else { | |
| t = 0x10; | |
| fid = pstate.bits.fid; | |
| if (family == 0x11) | |
| t = 0x8; | |
| cof = (100 * (fid + t)) >> did; | |
| } | |
| return cof; | |
| } | |
| /* Needs: | |
| * cpu -> the cpu that gets evaluated | |
| * cpu_family -> The cpu's family (0x10, 0x12,...) | |
| * boots_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, unsigned int cpu_family, | |
| int boost_states, unsigned long *pstates, int *no) | |
| { | |
| int i, psmax, pscur; | |
| union msr_pstate pstate; | |
| unsigned long long val; | |
| /* Only read out frequencies from HW when CPU might be boostable | |
| to keep the code as short and clean as possible. | |
| Otherwise frequencies are exported via ACPI tables. | |
| */ | |
| if (cpu_family < 0x10 || cpu_family == 0x14) | |
| return -1; | |
| if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val)) | |
| return -1; | |
| psmax = (val >> 4) & 0x7; | |
| if (read_msr(cpu, MSR_AMD_PSTATE_STATUS, &val)) | |
| return -1; | |
| pscur = val & 0x7; | |
| pscur += boost_states; | |
| 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; | |
| pstates[i] = get_cof(cpu_family, 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; | |
| } | |
| #endif /* defined(__i386__) || defined(__x86_64__) */ |