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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"
#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 res1:31;
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 || family == 0x18)
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 || family == 0x18) {
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;
if ((cpu_family == 0x17) && (!pstate.fam17h_bits.en))
continue;
else if (!pstate.bits.en)
continue;
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__) */
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