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Rewrite cpu_identify_all() function to support heterogeneous RAW dumps

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For Meteor Lake CPUs, performance and efficiency cores are mixed (unlike previous CPU generations), so the approach needs to be revisited.
This commit is contained in:
The Tumultuous Unicorn Of Darkness 2024-03-16 12:22:33 +01:00
parent 5bb1a2c7f9
commit 0b47460256
2 changed files with 114 additions and 82 deletions
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183
libcpuid/cpuid_main.c
View file

@ -118,6 +118,31 @@ static void cache_instances_t_constructor(struct internal_cache_instances_t* dat
memset(data->htable, 0, sizeof(data->htable));
}
static void type_info_array_t_constructor(struct internal_type_info_array_t* data)
{
data->num = 0;
data->data = NULL;
}
static int16_t cpuid_find_index_system_id(struct system_id_t* system, cpu_purpose_t purpose,
struct internal_type_info_array_t* type_info, int32_t package_id, bool is_apic_supported)
{
int16_t i = 0;
if (is_apic_supported) {
for (i = 0; i < system->num_cpu_types; i++)
if ((system->cpu_types[i].purpose == purpose) && (type_info->data[i].package_id == package_id))
return i;
}
else {
for (i = 0; i < system->num_cpu_types; i++)
if (system->cpu_types[i].purpose == purpose)
return i;
}
return -1;
}
static void cpuid_grow_raw_data_array(struct cpu_raw_data_array_t* raw_array, logical_cpu_t n)
{
logical_cpu_t i;
@ -156,6 +181,34 @@ static void cpuid_grow_system_id(struct system_id_t* system, uint8_t n)
system->cpu_types = tmp;
}
static void cpuid_grow_type_info(struct internal_type_info_array_t* type_info, uint8_t n)
{
uint8_t i;
struct internal_type_info_t *tmp = NULL;
if ((n <= 0) || (n < type_info->num)) return;
debugf(3, "Growing internal_type_info_t from %u to %u items\n", type_info->num, n);
tmp = realloc(type_info->data, sizeof(struct internal_type_info_t) * n);
if (tmp == NULL) { /* Memory allocation failure */
cpuid_set_error(ERR_NO_MEM);
return;
}
for (i = type_info->num; i < n; i++) {
core_instances_t_constructor(&tmp[i].core_instances);
cache_instances_t_constructor(&tmp[i].cache_instances);
}
type_info->num = n;
type_info->data = tmp;
}
static void cpuid_free_type_info(struct internal_type_info_array_t* type_info)
{
if (type_info->num <= 0) return;
free(type_info->data);
type_info->num = 0;
}
/* get_total_cpus() system specific code: uses OS routines to determine total number of CPUs */
#ifdef __APPLE__
#include <unistd.h>
@ -1244,23 +1297,19 @@ int cpu_identify_all(struct cpu_raw_data_array_t* raw_array, struct system_id_t*
int cur_error = cpuid_set_error(ERR_OK);
int ret_error = cpuid_set_error(ERR_OK);
double smt_divisor;
bool is_new_cpu_type;
bool is_last_item;
bool is_smt_supported;
bool is_apic_supported = true;
uint8_t cpu_type_index = 0;
int32_t num_logical_cpus = 0;
int16_t cpu_type_index = -1;
int32_t cur_package_id = 0;
int32_t prev_package_id = 0;
logical_cpu_t logical_cpu = 0;
cpu_purpose_t purpose;
cpu_affinity_mask_t affinity_mask;
struct cpu_raw_data_array_t my_raw_array;
struct internal_id_info_t id_info;
struct internal_apic_info_t apic_info;
struct internal_core_instances_t cores_type;
struct internal_cache_instances_t caches_type, caches_all;
struct internal_type_info_array_t type_info;
struct internal_cache_instances_t caches_all;
/* Init variables */
if (system == NULL)
return cpuid_set_error(ERR_HANDLE);
if (!raw_array) {
@ -1269,16 +1318,13 @@ int cpu_identify_all(struct cpu_raw_data_array_t* raw_array, struct system_id_t*
raw_array = &my_raw_array;
}
system_id_t_constructor(system);
core_instances_t_constructor(&cores_type);
cache_instances_t_constructor(&caches_type);
type_info_array_t_constructor(&type_info);
cache_instances_t_constructor(&caches_all);
if (raw_array->with_affinity)
init_affinity_mask(&affinity_mask);
/* Iterate over all raw */
for (logical_cpu = 0; logical_cpu < raw_array->num_raw; logical_cpu++) {
is_new_cpu_type = false;
is_last_item = (logical_cpu + 1 >= raw_array->num_raw);
debugf(2, "Identifying logical core %u\n", logical_cpu);
/* Get CPU purpose and APIC ID
For hybrid CPUs, the purpose may be different than the previous iteration (e.g. from P-cores to E-cores)
@ -1291,82 +1337,59 @@ int cpu_identify_all(struct cpu_raw_data_array_t* raw_array, struct system_id_t*
cur_package_id = apic_info.package_id;
}
/* Put data to system->cpu_types on the first iteration or when purpose is different than previous core */
if ((system->num_cpu_types == 0) || (purpose != system->cpu_types[system->num_cpu_types - 1].purpose) || (cur_package_id != prev_package_id)) {
is_new_cpu_type = true;
/* Put data to system->cpu_types on the first iteration or when purpose is new.
For motherboards with multiple CPUs, we grow the array when package ID is different. */
cpu_type_index = cpuid_find_index_system_id(system, purpose, &type_info, cur_package_id, is_apic_supported);
if (cpu_type_index < 0) {
cpu_type_index = system->num_cpu_types;
cpuid_grow_system_id(system, system->num_cpu_types + 1);
cur_error = cpu_ident_internal(&raw_array->raw[logical_cpu], &system->cpu_types[cpu_type_index], &id_info);
cpuid_grow_type_info(&type_info, type_info.num + 1);
cur_error = cpu_ident_internal(&raw_array->raw[logical_cpu], &system->cpu_types[cpu_type_index], &type_info.data[cpu_type_index].id_info);
type_info.data[cpu_type_index].purpose = purpose;
if (ret_error == ERR_OK)
ret_error = cur_error;
if (is_apic_supported)
type_info.data[cpu_type_index].package_id = cur_package_id;
if (raw_array->with_affinity)
system->cpu_types[cpu_type_index].num_logical_cpus = 0;
}
/* Increment counters only for current purpose */
if (raw_array->with_affinity && ((logical_cpu == 0) || !is_new_cpu_type)) {
set_affinity_mask_bit(logical_cpu, &affinity_mask);
num_logical_cpus++;
/* Increment counters */
if (raw_array->with_affinity) {
set_affinity_mask_bit(logical_cpu, &system->cpu_types[cpu_type_index].affinity_mask);
system->cpu_types[cpu_type_index].num_logical_cpus++;
if (is_apic_supported) {
update_core_instances(&cores_type, &apic_info);
update_cache_instances(&caches_type, &apic_info, &id_info, true);
update_cache_instances(&caches_all, &apic_info, &id_info, false);
update_core_instances(&type_info.data[cpu_type_index].core_instances, &apic_info);
update_cache_instances(&type_info.data[cpu_type_index].cache_instances, &apic_info, &type_info.data[cpu_type_index].id_info, true);
update_cache_instances(&caches_all, &apic_info, &type_info.data[cpu_type_index].id_info, false);
}
}
}
/* Update counters for all CPU types */
for (cpu_type_index = 0; cpu_type_index < system->num_cpu_types; cpu_type_index++) {
/* Overwrite core and cache counters when information is available per core */
if (raw_array->with_affinity) {
if (is_apic_supported) {
system->cpu_types[cpu_type_index].num_cores = type_info.data[cpu_type_index].core_instances.instances;
system->cpu_types[cpu_type_index].l1_instruction_instances = type_info.data[cpu_type_index].cache_instances.instances[L1I];
system->cpu_types[cpu_type_index].l1_data_instances = type_info.data[cpu_type_index].cache_instances.instances[L1D];
system->cpu_types[cpu_type_index].l2_instances = type_info.data[cpu_type_index].cache_instances.instances[L2];
system->cpu_types[cpu_type_index].l3_instances = type_info.data[cpu_type_index].cache_instances.instances[L3];
system->cpu_types[cpu_type_index].l4_instances = type_info.data[cpu_type_index].cache_instances.instances[L4];
}
else {
/* Note: if SMT is disabled by BIOS, smt_divisor will no reflect the current state properly */
is_smt_supported = system->cpu_types[cpu_type_index].num_cores > 0 ? (system->cpu_types[cpu_type_index].num_logical_cpus % system->cpu_types[cpu_type_index].num_cores) == 0 : false;
smt_divisor = is_smt_supported ? system->cpu_types[cpu_type_index].num_logical_cpus / system->cpu_types[cpu_type_index].num_cores : 1.0;
system->cpu_types[cpu_type_index].num_cores = (int32_t) (system->cpu_types[cpu_type_index].num_logical_cpus / smt_divisor);
}
}
/* Update logical CPU counters, physical CPU counters and cache instance in system->cpu_types
Note: we need to differenciate two events:
- is_new_cpu_type (e.g. purpose was 'efficiency' during previous loop, and now purpose is 'performance')
- is_last_item (i.e. this is the last iteration in raw_array->num_raw)
In some cases, both events can occur during the same iteration, thus we have to update counters twice for the same logical_cpu.
This occurs with single-core CPU type. For instance, Pentacore Lakefield CPU consists of:
- 1 "big" Sunny Cove core
- 4 "little" Tremont cores
On the last iteration, there is no need to reset values for the next purpose.
*/
if (raw_array->with_affinity && (is_last_item || (is_new_cpu_type && (system->num_cpu_types > 1)))) {
enum event_t {
EVENT_NEW_CPU_TYPE = 0,
EVENT_LAST_ITEM = 1
};
const enum event_t first_event = is_new_cpu_type && (system->num_cpu_types > 1) ? EVENT_NEW_CPU_TYPE : EVENT_LAST_ITEM;
const enum event_t last_event = is_last_item ? EVENT_LAST_ITEM : EVENT_NEW_CPU_TYPE;
for (enum event_t event = first_event; event <= last_event; event++) {
switch (event) {
case EVENT_NEW_CPU_TYPE: cpu_type_index = system->num_cpu_types - 2; break;
case EVENT_LAST_ITEM: cpu_type_index = system->num_cpu_types - 1; break;
default: warnf("Warning: event %i in cpu_identify_all() not handled.\n", event); return cpuid_set_error(ERR_NOT_IMP);
}
copy_affinity_mask(&system->cpu_types[cpu_type_index].affinity_mask, &affinity_mask);
if (event != EVENT_LAST_ITEM) {
init_affinity_mask(&affinity_mask);
set_affinity_mask_bit(logical_cpu, &affinity_mask);
}
if (is_apic_supported) {
system->cpu_types[cpu_type_index].num_cores = cores_type.instances;
system->cpu_types[cpu_type_index].l1_instruction_instances = caches_type.instances[L1I];
system->cpu_types[cpu_type_index].l1_data_instances = caches_type.instances[L1D];
system->cpu_types[cpu_type_index].l2_instances = caches_type.instances[L2];
system->cpu_types[cpu_type_index].l3_instances = caches_type.instances[L3];
system->cpu_types[cpu_type_index].l4_instances = caches_type.instances[L4];
if (event != EVENT_LAST_ITEM) {
core_instances_t_constructor(&cores_type);
cache_instances_t_constructor(&caches_type);
update_core_instances(&cores_type, &apic_info);
update_cache_instances(&caches_type, &apic_info, &id_info, true);
update_cache_instances(&caches_all, &apic_info, &id_info, false);
}
}
else {
/* Note: if SMT is disabled by BIOS, smt_divisor will no reflect the current state properly */
is_smt_supported = system->cpu_types[cpu_type_index].num_cores > 0 ? (system->cpu_types[cpu_type_index].num_logical_cpus % system->cpu_types[cpu_type_index].num_cores) == 0 : false;
smt_divisor = is_smt_supported ? system->cpu_types[cpu_type_index].num_logical_cpus / system->cpu_types[cpu_type_index].num_cores : 1.0;
system->cpu_types[cpu_type_index].num_cores = (int32_t) (num_logical_cpus / smt_divisor);
}
/* Save current values in system->cpu_types[cpu_type_index] and reset values for the next purpose */
system->cpu_types[cpu_type_index].num_logical_cpus = num_logical_cpus;
num_logical_cpus = 1;
}
}
prev_package_id = cur_package_id;
/* Update the total_logical_cpus value for each purpose */
system->cpu_types[cpu_type_index].total_logical_cpus = logical_cpu;
}
cpuid_free_type_info(&type_info);
/* Update the grand total of cache instances */
if (is_apic_supported) {
@ -1377,10 +1400,6 @@ int cpu_identify_all(struct cpu_raw_data_array_t* raw_array, struct system_id_t*
system->l4_total_instances = caches_all.instances[L4];
}
/* Update the total_logical_cpus value for each purpose */
for (cpu_type_index = 0; cpu_type_index < system->num_cpu_types; cpu_type_index++)
system->cpu_types[cpu_type_index].total_logical_cpus = logical_cpu;
return ret_error;
}

13
libcpuid/libcpuid_internal.h
View file

@ -109,6 +109,19 @@ struct internal_cache_instances_t {
struct internal_cache_id_t htable[NUM_CACHE_TYPES][CACHES_HTABLE_SIZE];
};
struct internal_type_info_t {
cpu_purpose_t purpose;
int32_t package_id;
struct internal_id_info_t id_info;
struct internal_core_instances_t core_instances;
struct internal_cache_instances_t cache_instances;
};
struct internal_type_info_array_t {
uint8_t num;
struct internal_type_info_t* data;
};
#define LBIT(x) (((long long) 1) << x)
enum _common_bits_t {