| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #if defined(__i386__) || defined(__x86_64__) |
| 3 | #include <unistd.h> |
| 4 | #include <errno.h> |
| 5 | #include <stdio.h> |
| 6 | #include <stdint.h> |
| 7 | |
| 8 | #include <pci/pci.h> |
| 9 | |
| 10 | #include "helpers/helpers.h" |
| 11 | |
| 12 | #define MSR_AMD_PSTATE_STATUS 0xc0010063 |
| 13 | #define MSR_AMD_PSTATE 0xc0010064 |
| 14 | #define MSR_AMD_PSTATE_LIMIT 0xc0010061 |
| 15 | |
| 16 | union msr_pstate { |
| 17 | struct { |
| 18 | unsigned fid:6; |
| 19 | unsigned did:3; |
| 20 | unsigned vid:7; |
| 21 | unsigned res1:6; |
| 22 | unsigned nbdid:1; |
| 23 | unsigned res2:2; |
| 24 | unsigned nbvid:7; |
| 25 | unsigned iddval:8; |
| 26 | unsigned idddiv:2; |
| 27 | unsigned res3:21; |
| 28 | unsigned en:1; |
| 29 | } bits; |
| 30 | struct { |
| 31 | unsigned fid:8; |
| 32 | unsigned did:6; |
| 33 | unsigned vid:8; |
| 34 | unsigned iddval:8; |
| 35 | unsigned idddiv:2; |
| 36 | unsigned res1:31; |
| 37 | unsigned en:1; |
| 38 | } fam17h_bits; |
| 39 | unsigned long long val; |
| 40 | }; |
| 41 | |
| 42 | static int get_did(int family, union msr_pstate pstate) |
| 43 | { |
| 44 | int t; |
| 45 | |
| 46 | if (family == 0x12) |
| 47 | t = pstate.val & 0xf; |
| 48 | else if (family == 0x17 || family == 0x18) |
| 49 | t = pstate.fam17h_bits.did; |
| 50 | else |
| 51 | t = pstate.bits.did; |
| 52 | |
| 53 | return t; |
| 54 | } |
| 55 | |
| 56 | static int get_cof(int family, union msr_pstate pstate) |
| 57 | { |
| 58 | int t; |
| 59 | int fid, did, cof; |
| 60 | |
| 61 | did = get_did(family, pstate); |
| 62 | if (family == 0x17 || family == 0x18) { |
| 63 | fid = pstate.fam17h_bits.fid; |
| 64 | cof = 200 * fid / did; |
| 65 | } else { |
| 66 | t = 0x10; |
| 67 | fid = pstate.bits.fid; |
| 68 | if (family == 0x11) |
| 69 | t = 0x8; |
| 70 | cof = (100 * (fid + t)) >> did; |
| 71 | } |
| 72 | return cof; |
| 73 | } |
| 74 | |
| 75 | /* Needs: |
| 76 | * cpu -> the cpu that gets evaluated |
| 77 | * cpu_family -> The cpu's family (0x10, 0x12,...) |
| 78 | * boots_states -> how much boost states the machines support |
| 79 | * |
| 80 | * Fills up: |
| 81 | * pstates -> a pointer to an array of size MAX_HW_PSTATES |
| 82 | * must be initialized with zeros. |
| 83 | * All available HW pstates (including boost states) |
| 84 | * no -> amount of pstates above array got filled up with |
| 85 | * |
| 86 | * returns zero on success, -1 on failure |
| 87 | */ |
| 88 | int decode_pstates(unsigned int cpu, unsigned int cpu_family, |
| 89 | int boost_states, unsigned long *pstates, int *no) |
| 90 | { |
| 91 | int i, psmax, pscur; |
| 92 | union msr_pstate pstate; |
| 93 | unsigned long long val; |
| 94 | |
| 95 | /* Only read out frequencies from HW when CPU might be boostable |
| 96 | to keep the code as short and clean as possible. |
| 97 | Otherwise frequencies are exported via ACPI tables. |
| 98 | */ |
| 99 | if (cpu_family < 0x10 || cpu_family == 0x14) |
| 100 | return -1; |
| 101 | |
| 102 | if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val)) |
| 103 | return -1; |
| 104 | |
| 105 | psmax = (val >> 4) & 0x7; |
| 106 | |
| 107 | if (read_msr(cpu, MSR_AMD_PSTATE_STATUS, &val)) |
| 108 | return -1; |
| 109 | |
| 110 | pscur = val & 0x7; |
| 111 | |
| 112 | pscur += boost_states; |
| 113 | psmax += boost_states; |
| 114 | for (i = 0; i <= psmax; i++) { |
| 115 | if (i >= MAX_HW_PSTATES) { |
| 116 | fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n", |
| 117 | psmax, MAX_HW_PSTATES); |
| 118 | return -1; |
| 119 | } |
| 120 | if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val)) |
| 121 | return -1; |
| 122 | if ((cpu_family == 0x17) && (!pstate.fam17h_bits.en)) |
| 123 | continue; |
| 124 | else if (!pstate.bits.en) |
| 125 | continue; |
| 126 | |
| 127 | pstates[i] = get_cof(cpu_family, pstate); |
| 128 | } |
| 129 | *no = i; |
| 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | int amd_pci_get_num_boost_states(int *active, int *states) |
| 134 | { |
| 135 | struct pci_access *pci_acc; |
| 136 | struct pci_dev *device; |
| 137 | uint8_t val = 0; |
| 138 | |
| 139 | *active = *states = 0; |
| 140 | |
| 141 | device = pci_slot_func_init(&pci_acc, 0x18, 4); |
| 142 | |
| 143 | if (device == NULL) |
| 144 | return -ENODEV; |
| 145 | |
| 146 | val = pci_read_byte(device, 0x15c); |
| 147 | if (val & 3) |
| 148 | *active = 1; |
| 149 | else |
| 150 | *active = 0; |
| 151 | *states = (val >> 2) & 7; |
| 152 | |
| 153 | pci_cleanup(pci_acc); |
| 154 | return 0; |
| 155 | } |
| 156 | #endif /* defined(__i386__) || defined(__x86_64__) */ |