1 // SPDX-License-Identifier: GPL-2.0
3 #include <sys/utsname.h>
8 #include <linux/zalloc.h>
9 #include <perf/cpumap.h>
18 #define PACKAGE_CPUS_FMT \
19 "%s/devices/system/cpu/cpu%d/topology/package_cpus_list"
20 #define PACKAGE_CPUS_FMT_OLD \
21 "%s/devices/system/cpu/cpu%d/topology/core_siblings_list"
22 #define DIE_CPUS_FMT \
23 "%s/devices/system/cpu/cpu%d/topology/die_cpus_list"
24 #define CORE_CPUS_FMT \
25 "%s/devices/system/cpu/cpu%d/topology/core_cpus_list"
26 #define CORE_CPUS_FMT_OLD \
27 "%s/devices/system/cpu/cpu%d/topology/thread_siblings_list"
28 #define NODE_ONLINE_FMT \
29 "%s/devices/system/node/online"
30 #define NODE_MEMINFO_FMT \
31 "%s/devices/system/node/node%d/meminfo"
32 #define NODE_CPULIST_FMT \
33 "%s/devices/system/node/node%d/cpulist"
35 static int build_cpu_topology(struct cpu_topology *tp, int cpu)
38 char filename[MAXPATHLEN];
45 scnprintf(filename, MAXPATHLEN, PACKAGE_CPUS_FMT,
46 sysfs__mountpoint(), cpu);
47 if (access(filename, F_OK) == -1) {
48 scnprintf(filename, MAXPATHLEN, PACKAGE_CPUS_FMT_OLD,
49 sysfs__mountpoint(), cpu);
51 fp = fopen(filename, "r");
55 sret = getline(&buf, &len, fp);
60 p = strchr(buf, '\n');
64 for (i = 0; i < tp->package_cpus_lists; i++) {
65 if (!strcmp(buf, tp->package_cpus_list[i]))
68 if (i == tp->package_cpus_lists) {
69 tp->package_cpus_list[i] = buf;
70 tp->package_cpus_lists++;
77 if (!tp->die_cpus_list)
80 scnprintf(filename, MAXPATHLEN, DIE_CPUS_FMT,
81 sysfs__mountpoint(), cpu);
82 fp = fopen(filename, "r");
86 sret = getline(&buf, &len, fp);
91 p = strchr(buf, '\n');
95 for (i = 0; i < tp->die_cpus_lists; i++) {
96 if (!strcmp(buf, tp->die_cpus_list[i]))
99 if (i == tp->die_cpus_lists) {
100 tp->die_cpus_list[i] = buf;
101 tp->die_cpus_lists++;
108 scnprintf(filename, MAXPATHLEN, CORE_CPUS_FMT,
109 sysfs__mountpoint(), cpu);
110 if (access(filename, F_OK) == -1) {
111 scnprintf(filename, MAXPATHLEN, CORE_CPUS_FMT_OLD,
112 sysfs__mountpoint(), cpu);
114 fp = fopen(filename, "r");
118 if (getline(&buf, &len, fp) <= 0)
121 p = strchr(buf, '\n');
125 for (i = 0; i < tp->core_cpus_lists; i++) {
126 if (!strcmp(buf, tp->core_cpus_list[i]))
129 if (i == tp->core_cpus_lists) {
130 tp->core_cpus_list[i] = buf;
131 tp->core_cpus_lists++;
142 void cpu_topology__delete(struct cpu_topology *tp)
149 for (i = 0 ; i < tp->package_cpus_lists; i++)
150 zfree(&tp->package_cpus_list[i]);
152 for (i = 0 ; i < tp->die_cpus_lists; i++)
153 zfree(&tp->die_cpus_list[i]);
155 for (i = 0 ; i < tp->core_cpus_lists; i++)
156 zfree(&tp->core_cpus_list[i]);
161 bool cpu_topology__smt_on(const struct cpu_topology *topology)
163 for (u32 i = 0; i < topology->core_cpus_lists; i++) {
164 const char *cpu_list = topology->core_cpus_list[i];
167 * If there is a need to separate siblings in a core then SMT is
170 if (strchr(cpu_list, ',') || strchr(cpu_list, '-'))
176 bool cpu_topology__core_wide(const struct cpu_topology *topology,
177 const char *user_requested_cpu_list)
179 struct perf_cpu_map *user_requested_cpus;
182 * If user_requested_cpu_list is empty then all CPUs are recorded and so
185 if (!user_requested_cpu_list)
188 user_requested_cpus = perf_cpu_map__new(user_requested_cpu_list);
189 /* Check that every user requested CPU is the complete set of SMT threads on a core. */
190 for (u32 i = 0; i < topology->core_cpus_lists; i++) {
191 const char *core_cpu_list = topology->core_cpus_list[i];
192 struct perf_cpu_map *core_cpus = perf_cpu_map__new(core_cpu_list);
195 bool has_first, first = true;
197 perf_cpu_map__for_each_cpu(cpu, idx, core_cpus) {
199 has_first = perf_cpu_map__has(user_requested_cpus, cpu);
203 * If the first core CPU is user requested then
204 * all subsequent CPUs in the core must be user
205 * requested too. If the first CPU isn't user
206 * requested then none of the others must be
209 if (perf_cpu_map__has(user_requested_cpus, cpu) != has_first) {
210 perf_cpu_map__put(core_cpus);
211 perf_cpu_map__put(user_requested_cpus);
216 perf_cpu_map__put(core_cpus);
218 perf_cpu_map__put(user_requested_cpus);
222 static bool has_die_topology(void)
224 char filename[MAXPATHLEN];
230 if (strncmp(uts.machine, "x86_64", 6) &&
231 strncmp(uts.machine, "s390x", 5))
234 scnprintf(filename, MAXPATHLEN, DIE_CPUS_FMT,
235 sysfs__mountpoint(), 0);
236 if (access(filename, F_OK) == -1)
242 const struct cpu_topology *online_topology(void)
244 static const struct cpu_topology *topology;
247 topology = cpu_topology__new();
249 pr_err("Error creating CPU topology");
256 struct cpu_topology *cpu_topology__new(void)
258 struct cpu_topology *tp = NULL;
264 struct perf_cpu_map *map;
265 bool has_die = has_die_topology();
267 ncpus = cpu__max_present_cpu().cpu;
269 /* build online CPU map */
270 map = perf_cpu_map__new_online_cpus();
272 pr_debug("failed to get system cpumap\n");
276 nr = (u32)(ncpus & UINT_MAX);
278 sz = nr * sizeof(char *);
283 addr = calloc(1, sizeof(*tp) + nr_addr * sz);
289 tp->package_cpus_list = addr;
292 tp->die_cpus_list = addr;
295 tp->core_cpus_list = addr;
297 for (i = 0; i < nr; i++) {
298 if (!perf_cpu_map__has(map, (struct perf_cpu){ .cpu = i }))
301 ret = build_cpu_topology(tp, i);
307 perf_cpu_map__put(map);
309 cpu_topology__delete(tp);
315 static int load_numa_node(struct numa_topology_node *node, int nr)
317 char str[MAXPATHLEN];
319 char *buf = NULL, *p;
325 node->node = (u32) nr;
327 scnprintf(str, MAXPATHLEN, NODE_MEMINFO_FMT,
328 sysfs__mountpoint(), nr);
329 fp = fopen(str, "r");
333 while (getline(&buf, &len, fp) > 0) {
334 /* skip over invalid lines */
335 if (!strchr(buf, ':'))
337 if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
339 if (!strcmp(field, "MemTotal:"))
340 node->mem_total = mem;
341 if (!strcmp(field, "MemFree:"))
342 node->mem_free = mem;
343 if (node->mem_total && node->mem_free)
350 scnprintf(str, MAXPATHLEN, NODE_CPULIST_FMT,
351 sysfs__mountpoint(), nr);
353 fp = fopen(str, "r");
357 if (getline(&buf, &len, fp) <= 0)
360 p = strchr(buf, '\n');
375 struct numa_topology *numa_topology__new(void)
377 struct perf_cpu_map *node_map = NULL;
378 struct numa_topology *tp = NULL;
379 char path[MAXPATHLEN];
386 scnprintf(path, MAXPATHLEN, NODE_ONLINE_FMT,
387 sysfs__mountpoint());
389 fp = fopen(path, "r");
393 if (getline(&buf, &len, fp) <= 0)
396 c = strchr(buf, '\n');
400 node_map = perf_cpu_map__new(buf);
404 nr = (u32) perf_cpu_map__nr(node_map);
406 tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0])*nr);
412 for (i = 0; i < nr; i++) {
413 if (load_numa_node(&tp->nodes[i], perf_cpu_map__cpu(node_map, i).cpu)) {
414 numa_topology__delete(tp);
423 perf_cpu_map__put(node_map);
427 void numa_topology__delete(struct numa_topology *tp)
431 for (i = 0; i < tp->nr; i++)
432 zfree(&tp->nodes[i].cpus);
437 static int load_hybrid_node(struct hybrid_topology_node *node,
438 struct perf_pmu *pmu)
440 char *buf = NULL, *p;
444 node->pmu_name = strdup(pmu->name);
448 fp = perf_pmu__open_file(pmu, "cpus");
452 if (getline(&buf, &len, fp) <= 0) {
457 p = strchr(buf, '\n');
466 zfree(&node->pmu_name);
471 struct hybrid_topology *hybrid_topology__new(void)
473 struct perf_pmu *pmu = NULL;
474 struct hybrid_topology *tp = NULL;
475 int nr = perf_pmus__num_core_pmus(), i = 0;
480 tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0]) * nr);
485 while ((pmu = perf_pmus__scan_core(pmu)) != NULL) {
486 if (load_hybrid_node(&tp->nodes[i], pmu)) {
487 hybrid_topology__delete(tp);
496 void hybrid_topology__delete(struct hybrid_topology *tp)
500 for (i = 0; i < tp->nr; i++) {
501 zfree(&tp->nodes[i].pmu_name);
502 zfree(&tp->nodes[i].cpus);