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#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <cpuinfo.h>
#include <arm/linux/api.h>
#include <arm/api.h>
#include <linux/api.h>
#include <api.h>
#include <log.h>
struct cpuinfo_arm_isa cpuinfo_isa = { 0 };
void cpuinfo_arm_linux_init(void) {
uint32_t proc_cpuinfo_count = 0;
struct cpuinfo_processor* processors = NULL;
struct cpuinfo_cache* l1i = NULL;
struct cpuinfo_cache* l1d = NULL;
struct cpuinfo_cache* l2 = NULL;
uint32_t processors_count = 0;
uint32_t l1i_count = 0;
uint32_t l1d_count = 0;
uint32_t l2_count = 0;
struct proc_cpuinfo* proc_cpuinfo_entries = cpuinfo_arm_linux_parse_proc_cpuinfo("/proc/cpuinfo", &proc_cpuinfo_count);
if (proc_cpuinfo_count != 0) {
cpuinfo_arm_linux_decode_isa_from_proc_cpuinfo(
proc_cpuinfo_entries, proc_cpuinfo_count, &cpuinfo_isa);
processors_count = proc_cpuinfo_count;
processors = calloc(processors_count, sizeof(struct cpuinfo_processor));
if (processors == NULL) {
cpuinfo_log_error("failed to allocate %zu bytes for descriptions of %"PRIu32" logical processors",
proc_cpuinfo_count * sizeof(struct cpuinfo_processor), proc_cpuinfo_count);
goto cleanup;
}
for (uint32_t i = 0; i < proc_cpuinfo_count; i++) {
cpuinfo_arm_decode_vendor_uarch(
proc_cpuinfo_entries[i].implementer,
proc_cpuinfo_entries[i].part,
!!(proc_cpuinfo_entries[i].features & PROC_CPUINFO_FEATURE_VFPV4),
&processors[i].vendor, &processors[i].uarch);
processors[i].topology = (struct cpuinfo_topology) {
.thread_id = 0,
.core_id = i,
.package_id = 0,
.linux_id = (int) i
};
}
/*
* Assumptions:
* - At most 2 cache levels
* - Either all or no cores have L1I/L1D/L2 cache.
* - If present, L1 cache is private to the core.
* - If present, L2 cache is shared between all cores.
*/
struct cpuinfo_cache private_l1i = { 0 };
struct cpuinfo_cache private_l1d = { 0 };
struct cpuinfo_cache shared_l2 = { 0 };
cpuinfo_arm_decode_cache(
processors[0].uarch,
proc_cpuinfo_count,
proc_cpuinfo_entries[0].part,
proc_cpuinfo_entries[0].architecture.version,
&private_l1i, &private_l1d, &shared_l2);
if (private_l1i.size != 0) {
l1i_count = proc_cpuinfo_count;
}
if (private_l1d.size != 0) {
l1d_count = proc_cpuinfo_count;
if (shared_l2.size != 0) {
l2_count = 1;
}
}
cpuinfo_log_info("detected %"PRIu32" L1I caches", l1i_count);
cpuinfo_log_info("detected %"PRIu32" L1D caches", l1d_count);
cpuinfo_log_info("detected %"PRIu32" L2 caches", l2_count);
if (l1i_count != 0) {
l1i = malloc(l1i_count * sizeof(struct cpuinfo_cache));
if (l1i == NULL) {
cpuinfo_log_error("failed to allocate %zu bytes for descriptions of %"PRIu32" L1I caches",
l1i_count * sizeof(struct cpuinfo_cache), l1i_count);
goto cleanup;
}
for (uint32_t i = 0; i < l1i_count; i++) {
/* L1I reported in /proc/cpuinfo overrides defaults */
if ((proc_cpuinfo_entries[i].valid_mask & PROC_CPUINFO_VALID_ICACHE) == PROC_CPUINFO_VALID_ICACHE) {
l1i[i] = (struct cpuinfo_cache) {
.size = proc_cpuinfo_entries[i].cache.i_size,
.associativity = proc_cpuinfo_entries[i].cache.i_assoc,
.sets = proc_cpuinfo_entries[i].cache.i_sets,
.partitions = 1,
.line_size = proc_cpuinfo_entries[i].cache.i_line_length
};
} else {
cpuinfo_arm_decode_cache(
processors[i].uarch,
proc_cpuinfo_count,
proc_cpuinfo_entries[i].part,
proc_cpuinfo_entries[i].architecture.version,
&l1i[i], &private_l1d, &shared_l2);
}
l1i[i].thread_start = i;
l1i[i].thread_count = 1;
}
}
if (l1d_count != 0) {
l1d = malloc(l1d_count * sizeof(struct cpuinfo_cache));
if (l1d == NULL) {
cpuinfo_log_error("failed to allocate %zu bytes for descriptions of %"PRIu32" L1D caches",
l1d_count * sizeof(struct cpuinfo_cache), l1d_count);
goto cleanup;
}
for (uint32_t i = 0; i < l1d_count; i++) {
/* L1D reported in /proc/cpuinfo overrides defaults */
if ((proc_cpuinfo_entries[i].valid_mask & PROC_CPUINFO_VALID_DCACHE) == PROC_CPUINFO_VALID_DCACHE) {
l1d[i] = (struct cpuinfo_cache) {
.size = proc_cpuinfo_entries[i].cache.d_size,
.associativity = proc_cpuinfo_entries[i].cache.d_assoc,
.sets = proc_cpuinfo_entries[i].cache.d_sets,
.partitions = 1,
.line_size = proc_cpuinfo_entries[i].cache.d_line_length
};
} else {
cpuinfo_arm_decode_cache(
processors[i].uarch,
proc_cpuinfo_count,
proc_cpuinfo_entries[i].part,
proc_cpuinfo_entries[i].architecture.version,
&private_l1i, &l1d[i], &shared_l2);
}
l1d[i].thread_start = i;
l1d[i].thread_count = 1;
}
}
if (l2_count != 0) {
l2 = malloc(l2_count * sizeof(struct cpuinfo_cache));
if (l2 == NULL) {
cpuinfo_log_error("failed to allocate %zu bytes for descriptions of %"PRIu32" L2 caches",
l2_count * sizeof(struct cpuinfo_cache), l2_count);
goto cleanup;
}
/* L2 cache is never reported in /proc/cpuinfo; use defaults */
*l2 = shared_l2;
l2->thread_start = 0;
l2->thread_count = proc_cpuinfo_count;
}
}
/* Commit */
cpuinfo_processors = processors;
cpuinfo_cache[cpuinfo_cache_level_1i] = l1i;
cpuinfo_cache[cpuinfo_cache_level_1d] = l1d;
cpuinfo_cache[cpuinfo_cache_level_2] = l2;
cpuinfo_processors_count = processors_count;
cpuinfo_cache_count[cpuinfo_cache_level_1i] = l1i_count;
cpuinfo_cache_count[cpuinfo_cache_level_1d] = l1d_count;
cpuinfo_cache_count[cpuinfo_cache_level_2] = l2_count;
processors = NULL;
l1i = l1d = l2 = NULL;
cleanup:
free(processors);
free(l1i);
free(l1d);
free(l2);
free(proc_cpuinfo_entries);
}
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