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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /tools/perf/util/cputopo.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/util/cputopo.c')
-rw-r--r--tools/perf/util/cputopo.c506
1 files changed, 506 insertions, 0 deletions
diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
new file mode 100644
index 0000000000..81cfc85f46
--- /dev/null
+++ b/tools/perf/util/cputopo.c
@@ -0,0 +1,506 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <sys/param.h>
+#include <sys/utsname.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include <api/fs/fs.h>
+#include <linux/zalloc.h>
+#include <perf/cpumap.h>
+
+#include "cputopo.h"
+#include "cpumap.h"
+#include "debug.h"
+#include "env.h"
+#include "pmu.h"
+#include "pmus.h"
+
+#define PACKAGE_CPUS_FMT \
+ "%s/devices/system/cpu/cpu%d/topology/package_cpus_list"
+#define PACKAGE_CPUS_FMT_OLD \
+ "%s/devices/system/cpu/cpu%d/topology/core_siblings_list"
+#define DIE_CPUS_FMT \
+ "%s/devices/system/cpu/cpu%d/topology/die_cpus_list"
+#define CORE_CPUS_FMT \
+ "%s/devices/system/cpu/cpu%d/topology/core_cpus_list"
+#define CORE_CPUS_FMT_OLD \
+ "%s/devices/system/cpu/cpu%d/topology/thread_siblings_list"
+#define NODE_ONLINE_FMT \
+ "%s/devices/system/node/online"
+#define NODE_MEMINFO_FMT \
+ "%s/devices/system/node/node%d/meminfo"
+#define NODE_CPULIST_FMT \
+ "%s/devices/system/node/node%d/cpulist"
+
+static int build_cpu_topology(struct cpu_topology *tp, int cpu)
+{
+ FILE *fp;
+ char filename[MAXPATHLEN];
+ char *buf = NULL, *p;
+ size_t len = 0;
+ ssize_t sret;
+ u32 i = 0;
+ int ret = -1;
+
+ scnprintf(filename, MAXPATHLEN, PACKAGE_CPUS_FMT,
+ sysfs__mountpoint(), cpu);
+ if (access(filename, F_OK) == -1) {
+ scnprintf(filename, MAXPATHLEN, PACKAGE_CPUS_FMT_OLD,
+ sysfs__mountpoint(), cpu);
+ }
+ fp = fopen(filename, "r");
+ if (!fp)
+ goto try_dies;
+
+ sret = getline(&buf, &len, fp);
+ fclose(fp);
+ if (sret <= 0)
+ goto try_dies;
+
+ p = strchr(buf, '\n');
+ if (p)
+ *p = '\0';
+
+ for (i = 0; i < tp->package_cpus_lists; i++) {
+ if (!strcmp(buf, tp->package_cpus_list[i]))
+ break;
+ }
+ if (i == tp->package_cpus_lists) {
+ tp->package_cpus_list[i] = buf;
+ tp->package_cpus_lists++;
+ buf = NULL;
+ len = 0;
+ }
+ ret = 0;
+
+try_dies:
+ if (!tp->die_cpus_list)
+ goto try_threads;
+
+ scnprintf(filename, MAXPATHLEN, DIE_CPUS_FMT,
+ sysfs__mountpoint(), cpu);
+ fp = fopen(filename, "r");
+ if (!fp)
+ goto try_threads;
+
+ sret = getline(&buf, &len, fp);
+ fclose(fp);
+ if (sret <= 0)
+ goto try_threads;
+
+ p = strchr(buf, '\n');
+ if (p)
+ *p = '\0';
+
+ for (i = 0; i < tp->die_cpus_lists; i++) {
+ if (!strcmp(buf, tp->die_cpus_list[i]))
+ break;
+ }
+ if (i == tp->die_cpus_lists) {
+ tp->die_cpus_list[i] = buf;
+ tp->die_cpus_lists++;
+ buf = NULL;
+ len = 0;
+ }
+ ret = 0;
+
+try_threads:
+ scnprintf(filename, MAXPATHLEN, CORE_CPUS_FMT,
+ sysfs__mountpoint(), cpu);
+ if (access(filename, F_OK) == -1) {
+ scnprintf(filename, MAXPATHLEN, CORE_CPUS_FMT_OLD,
+ sysfs__mountpoint(), cpu);
+ }
+ fp = fopen(filename, "r");
+ if (!fp)
+ goto done;
+
+ if (getline(&buf, &len, fp) <= 0)
+ goto done;
+
+ p = strchr(buf, '\n');
+ if (p)
+ *p = '\0';
+
+ for (i = 0; i < tp->core_cpus_lists; i++) {
+ if (!strcmp(buf, tp->core_cpus_list[i]))
+ break;
+ }
+ if (i == tp->core_cpus_lists) {
+ tp->core_cpus_list[i] = buf;
+ tp->core_cpus_lists++;
+ buf = NULL;
+ }
+ ret = 0;
+done:
+ if (fp)
+ fclose(fp);
+ free(buf);
+ return ret;
+}
+
+void cpu_topology__delete(struct cpu_topology *tp)
+{
+ u32 i;
+
+ if (!tp)
+ return;
+
+ for (i = 0 ; i < tp->package_cpus_lists; i++)
+ zfree(&tp->package_cpus_list[i]);
+
+ for (i = 0 ; i < tp->die_cpus_lists; i++)
+ zfree(&tp->die_cpus_list[i]);
+
+ for (i = 0 ; i < tp->core_cpus_lists; i++)
+ zfree(&tp->core_cpus_list[i]);
+
+ free(tp);
+}
+
+bool cpu_topology__smt_on(const struct cpu_topology *topology)
+{
+ for (u32 i = 0; i < topology->core_cpus_lists; i++) {
+ const char *cpu_list = topology->core_cpus_list[i];
+
+ /*
+ * If there is a need to separate siblings in a core then SMT is
+ * enabled.
+ */
+ if (strchr(cpu_list, ',') || strchr(cpu_list, '-'))
+ return true;
+ }
+ return false;
+}
+
+bool cpu_topology__core_wide(const struct cpu_topology *topology,
+ const char *user_requested_cpu_list)
+{
+ struct perf_cpu_map *user_requested_cpus;
+
+ /*
+ * If user_requested_cpu_list is empty then all CPUs are recorded and so
+ * core_wide is true.
+ */
+ if (!user_requested_cpu_list)
+ return true;
+
+ user_requested_cpus = perf_cpu_map__new(user_requested_cpu_list);
+ /* Check that every user requested CPU is the complete set of SMT threads on a core. */
+ for (u32 i = 0; i < topology->core_cpus_lists; i++) {
+ const char *core_cpu_list = topology->core_cpus_list[i];
+ struct perf_cpu_map *core_cpus = perf_cpu_map__new(core_cpu_list);
+ struct perf_cpu cpu;
+ int idx;
+ bool has_first, first = true;
+
+ perf_cpu_map__for_each_cpu(cpu, idx, core_cpus) {
+ if (first) {
+ has_first = perf_cpu_map__has(user_requested_cpus, cpu);
+ first = false;
+ } else {
+ /*
+ * If the first core CPU is user requested then
+ * all subsequent CPUs in the core must be user
+ * requested too. If the first CPU isn't user
+ * requested then none of the others must be
+ * too.
+ */
+ if (perf_cpu_map__has(user_requested_cpus, cpu) != has_first) {
+ perf_cpu_map__put(core_cpus);
+ perf_cpu_map__put(user_requested_cpus);
+ return false;
+ }
+ }
+ }
+ perf_cpu_map__put(core_cpus);
+ }
+ perf_cpu_map__put(user_requested_cpus);
+ return true;
+}
+
+static bool has_die_topology(void)
+{
+ char filename[MAXPATHLEN];
+ struct utsname uts;
+
+ if (uname(&uts) < 0)
+ return false;
+
+ if (strncmp(uts.machine, "x86_64", 6) &&
+ strncmp(uts.machine, "s390x", 5))
+ return false;
+
+ scnprintf(filename, MAXPATHLEN, DIE_CPUS_FMT,
+ sysfs__mountpoint(), 0);
+ if (access(filename, F_OK) == -1)
+ return false;
+
+ return true;
+}
+
+const struct cpu_topology *online_topology(void)
+{
+ static const struct cpu_topology *topology;
+
+ if (!topology) {
+ topology = cpu_topology__new();
+ if (!topology) {
+ pr_err("Error creating CPU topology");
+ abort();
+ }
+ }
+ return topology;
+}
+
+struct cpu_topology *cpu_topology__new(void)
+{
+ struct cpu_topology *tp = NULL;
+ void *addr;
+ u32 nr, i, nr_addr;
+ size_t sz;
+ long ncpus;
+ int ret = -1;
+ struct perf_cpu_map *map;
+ bool has_die = has_die_topology();
+
+ ncpus = cpu__max_present_cpu().cpu;
+
+ /* build online CPU map */
+ map = perf_cpu_map__new(NULL);
+ if (map == NULL) {
+ pr_debug("failed to get system cpumap\n");
+ return NULL;
+ }
+
+ nr = (u32)(ncpus & UINT_MAX);
+
+ sz = nr * sizeof(char *);
+ if (has_die)
+ nr_addr = 3;
+ else
+ nr_addr = 2;
+ addr = calloc(1, sizeof(*tp) + nr_addr * sz);
+ if (!addr)
+ goto out_free;
+
+ tp = addr;
+ addr += sizeof(*tp);
+ tp->package_cpus_list = addr;
+ addr += sz;
+ if (has_die) {
+ tp->die_cpus_list = addr;
+ addr += sz;
+ }
+ tp->core_cpus_list = addr;
+
+ for (i = 0; i < nr; i++) {
+ if (!perf_cpu_map__has(map, (struct perf_cpu){ .cpu = i }))
+ continue;
+
+ ret = build_cpu_topology(tp, i);
+ if (ret < 0)
+ break;
+ }
+
+out_free:
+ perf_cpu_map__put(map);
+ if (ret) {
+ cpu_topology__delete(tp);
+ tp = NULL;
+ }
+ return tp;
+}
+
+static int load_numa_node(struct numa_topology_node *node, int nr)
+{
+ char str[MAXPATHLEN];
+ char field[32];
+ char *buf = NULL, *p;
+ size_t len = 0;
+ int ret = -1;
+ FILE *fp;
+ u64 mem;
+
+ node->node = (u32) nr;
+
+ scnprintf(str, MAXPATHLEN, NODE_MEMINFO_FMT,
+ sysfs__mountpoint(), nr);
+ fp = fopen(str, "r");
+ if (!fp)
+ return -1;
+
+ while (getline(&buf, &len, fp) > 0) {
+ /* skip over invalid lines */
+ if (!strchr(buf, ':'))
+ continue;
+ if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
+ goto err;
+ if (!strcmp(field, "MemTotal:"))
+ node->mem_total = mem;
+ if (!strcmp(field, "MemFree:"))
+ node->mem_free = mem;
+ if (node->mem_total && node->mem_free)
+ break;
+ }
+
+ fclose(fp);
+ fp = NULL;
+
+ scnprintf(str, MAXPATHLEN, NODE_CPULIST_FMT,
+ sysfs__mountpoint(), nr);
+
+ fp = fopen(str, "r");
+ if (!fp)
+ return -1;
+
+ if (getline(&buf, &len, fp) <= 0)
+ goto err;
+
+ p = strchr(buf, '\n');
+ if (p)
+ *p = '\0';
+
+ node->cpus = buf;
+ fclose(fp);
+ return 0;
+
+err:
+ free(buf);
+ if (fp)
+ fclose(fp);
+ return ret;
+}
+
+struct numa_topology *numa_topology__new(void)
+{
+ struct perf_cpu_map *node_map = NULL;
+ struct numa_topology *tp = NULL;
+ char path[MAXPATHLEN];
+ char *buf = NULL;
+ size_t len = 0;
+ u32 nr, i;
+ FILE *fp;
+ char *c;
+
+ scnprintf(path, MAXPATHLEN, NODE_ONLINE_FMT,
+ sysfs__mountpoint());
+
+ fp = fopen(path, "r");
+ if (!fp)
+ return NULL;
+
+ if (getline(&buf, &len, fp) <= 0)
+ goto out;
+
+ c = strchr(buf, '\n');
+ if (c)
+ *c = '\0';
+
+ node_map = perf_cpu_map__new(buf);
+ if (!node_map)
+ goto out;
+
+ nr = (u32) perf_cpu_map__nr(node_map);
+
+ tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0])*nr);
+ if (!tp)
+ goto out;
+
+ tp->nr = nr;
+
+ for (i = 0; i < nr; i++) {
+ if (load_numa_node(&tp->nodes[i], perf_cpu_map__cpu(node_map, i).cpu)) {
+ numa_topology__delete(tp);
+ tp = NULL;
+ break;
+ }
+ }
+
+out:
+ free(buf);
+ fclose(fp);
+ perf_cpu_map__put(node_map);
+ return tp;
+}
+
+void numa_topology__delete(struct numa_topology *tp)
+{
+ u32 i;
+
+ for (i = 0; i < tp->nr; i++)
+ zfree(&tp->nodes[i].cpus);
+
+ free(tp);
+}
+
+static int load_hybrid_node(struct hybrid_topology_node *node,
+ struct perf_pmu *pmu)
+{
+ char *buf = NULL, *p;
+ FILE *fp;
+ size_t len = 0;
+
+ node->pmu_name = strdup(pmu->name);
+ if (!node->pmu_name)
+ return -1;
+
+ fp = perf_pmu__open_file(pmu, "cpus");
+ if (!fp)
+ goto err;
+
+ if (getline(&buf, &len, fp) <= 0) {
+ fclose(fp);
+ goto err;
+ }
+
+ p = strchr(buf, '\n');
+ if (p)
+ *p = '\0';
+
+ fclose(fp);
+ node->cpus = buf;
+ return 0;
+
+err:
+ zfree(&node->pmu_name);
+ free(buf);
+ return -1;
+}
+
+struct hybrid_topology *hybrid_topology__new(void)
+{
+ struct perf_pmu *pmu = NULL;
+ struct hybrid_topology *tp = NULL;
+ int nr = perf_pmus__num_core_pmus(), i = 0;
+
+ if (nr <= 1)
+ return NULL;
+
+ tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0]) * nr);
+ if (!tp)
+ return NULL;
+
+ tp->nr = nr;
+ while ((pmu = perf_pmus__scan_core(pmu)) != NULL) {
+ if (load_hybrid_node(&tp->nodes[i], pmu)) {
+ hybrid_topology__delete(tp);
+ return NULL;
+ }
+ i++;
+ }
+
+ return tp;
+}
+
+void hybrid_topology__delete(struct hybrid_topology *tp)
+{
+ u32 i;
+
+ for (i = 0; i < tp->nr; i++) {
+ zfree(&tp->nodes[i].pmu_name);
+ zfree(&tp->nodes[i].cpus);
+ }
+
+ free(tp);
+}