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568a89904c
AMD's BKDG (Bios and Kernel Developers Guide) talks in the CPU spec of their CPU families about PCI registers defined by "device" (slot) and func(tion). Assuming that CPU specific configuration PCI devices are always on domain and bus zero a pci_slot_func_init() func which gets the slot and func of the desired PCI device passed looks like the most convenient way. This also obsoletes the PCI device id maintenance. Signed-off-by: Thomas Renninger <trenn@suse.de> CC: Andreas Herrmann <herrmann.der.user@googlemail.com> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
136 lines
2.8 KiB
C
136 lines
2.8 KiB
C
#if defined(__i386__) || defined(__x86_64__)
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <pci/pci.h>
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#include "helpers/helpers.h"
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#define MSR_AMD_PSTATE_STATUS 0xc0010063
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#define MSR_AMD_PSTATE 0xc0010064
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#define MSR_AMD_PSTATE_LIMIT 0xc0010061
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union msr_pstate {
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struct {
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unsigned fid:6;
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unsigned did:3;
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unsigned vid:7;
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unsigned res1:6;
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unsigned nbdid:1;
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unsigned res2:2;
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unsigned nbvid:7;
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unsigned iddval:8;
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unsigned idddiv:2;
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unsigned res3:21;
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unsigned en:1;
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} bits;
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unsigned long long val;
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};
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static int get_did(int family, union msr_pstate pstate)
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{
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int t;
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if (family == 0x12)
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t = pstate.val & 0xf;
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else
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t = pstate.bits.did;
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return t;
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}
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static int get_cof(int family, union msr_pstate pstate)
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{
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int t;
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int fid, did;
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did = get_did(family, pstate);
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t = 0x10;
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fid = pstate.bits.fid;
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if (family == 0x11)
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t = 0x8;
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return (100 * (fid + t)) >> did;
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}
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/* Needs:
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* cpu -> the cpu that gets evaluated
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* cpu_family -> The cpu's family (0x10, 0x12,...)
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* boots_states -> how much boost states the machines support
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*
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* Fills up:
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* pstates -> a pointer to an array of size MAX_HW_PSTATES
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* must be initialized with zeros.
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* All available HW pstates (including boost states)
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* no -> amount of pstates above array got filled up with
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*
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* returns zero on success, -1 on failure
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*/
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int decode_pstates(unsigned int cpu, unsigned int cpu_family,
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int boost_states, unsigned long *pstates, int *no)
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{
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int i, psmax, pscur;
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union msr_pstate pstate;
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unsigned long long val;
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/* Only read out frequencies from HW when CPU might be boostable
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to keep the code as short and clean as possible.
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Otherwise frequencies are exported via ACPI tables.
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*/
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if (cpu_family < 0x10 || cpu_family == 0x14)
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return -1;
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if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val))
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return -1;
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psmax = (val >> 4) & 0x7;
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if (read_msr(cpu, MSR_AMD_PSTATE_STATUS, &val))
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return -1;
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pscur = val & 0x7;
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pscur += boost_states;
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psmax += boost_states;
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for (i = 0; i <= psmax; i++) {
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if (i >= MAX_HW_PSTATES) {
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fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n",
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psmax, MAX_HW_PSTATES);
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return -1;
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}
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if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val))
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return -1;
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pstates[i] = get_cof(cpu_family, pstate);
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}
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*no = i;
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return 0;
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}
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int amd_pci_get_num_boost_states(int *active, int *states)
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{
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struct pci_access *pci_acc;
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struct pci_dev *device;
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uint8_t val = 0;
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*active = *states = 0;
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device = pci_slot_func_init(&pci_acc, 0x18, 4);
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if (device == NULL)
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return -ENODEV;
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val = pci_read_byte(device, 0x15c);
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if (val & 3)
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*active = 1;
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else
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*active = 0;
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*states = (val >> 2) & 7;
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pci_cleanup(pci_acc);
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return 0;
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}
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#endif /* defined(__i386__) || defined(__x86_64__) */
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