tools/power/cpupower/utils/helpers/amd.c

   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 res1:30;
  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)
  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) {
  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                 pstates[i] = get_cof(cpu_family, pstate);
 123         }
 124         *no = i;
 125         return 0;
 126 }
 127
 128 int amd_pci_get_num_boost_states(int *active, int *states)
 129 {
 130         struct pci_access *pci_acc;
 131         struct pci_dev *device;
 132         uint8_t val = 0;
 133
 134         *active = *states = 0;
 135
 136         device = pci_slot_func_init(&pci_acc, 0x18, 4);
 137
 138         if (device == NULL)
 139                 return -ENODEV;
 140
 141         val = pci_read_byte(device, 0x15c);
 142         if (val & 3)
 143                 *active = 1;
 144         else
 145                 *active = 0;
 146         *states = (val >> 2) & 7;
 147
 148         pci_cleanup(pci_acc);
 149         return 0;
 150 }
 151 #endif /* defined(__i386__) || defined(__x86_64__) */