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

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