1 files changed, 735 insertions, 0 deletions

diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
new file mode 100644
index 000000000..827d844f4
--- /dev/null
+++ b/tools/perf/util/cpumap.c
@@ -0,0 +1,735 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "util.h"
+#include <api/fs/fs.h>
+#include "../perf.h"
+#include "cpumap.h"
+#include <assert.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <linux/bitmap.h>
+#include "asm/bug.h"
+
+#include "sane_ctype.h"
+
+static int max_cpu_num;
+static int max_present_cpu_num;
+static int max_node_num;
+static int *cpunode_map;
+
+static struct cpu_map *cpu_map__default_new(void)
+{
+	struct cpu_map *cpus;
+	int nr_cpus;
+
+	nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+	if (nr_cpus < 0)
+		return NULL;
+
+	cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
+	if (cpus != NULL) {
+		int i;
+		for (i = 0; i < nr_cpus; ++i)
+			cpus->map[i] = i;
+
+		cpus->nr = nr_cpus;
+		refcount_set(&cpus->refcnt, 1);
+	}
+
+	return cpus;
+}
+
+static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
+{
+	size_t payload_size = nr_cpus * sizeof(int);
+	struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
+
+	if (cpus != NULL) {
+		cpus->nr = nr_cpus;
+		memcpy(cpus->map, tmp_cpus, payload_size);
+		refcount_set(&cpus->refcnt, 1);
+	}
+
+	return cpus;
+}
+
+struct cpu_map *cpu_map__read(FILE *file)
+{
+	struct cpu_map *cpus = NULL;
+	int nr_cpus = 0;
+	int *tmp_cpus = NULL, *tmp;
+	int max_entries = 0;
+	int n, cpu, prev;
+	char sep;
+
+	sep = 0;
+	prev = -1;
+	for (;;) {
+		n = fscanf(file, "%u%c", &cpu, &sep);
+		if (n <= 0)
+			break;
+		if (prev >= 0) {
+			int new_max = nr_cpus + cpu - prev - 1;
+
+			if (new_max >= max_entries) {
+				max_entries = new_max + MAX_NR_CPUS / 2;
+				tmp = realloc(tmp_cpus, max_entries * sizeof(int));
+				if (tmp == NULL)
+					goto out_free_tmp;
+				tmp_cpus = tmp;
+			}
+
+			while (++prev < cpu)
+				tmp_cpus[nr_cpus++] = prev;
+		}
+		if (nr_cpus == max_entries) {
+			max_entries += MAX_NR_CPUS;
+			tmp = realloc(tmp_cpus, max_entries * sizeof(int));
+			if (tmp == NULL)
+				goto out_free_tmp;
+			tmp_cpus = tmp;
+		}
+
+		tmp_cpus[nr_cpus++] = cpu;
+		if (n == 2 && sep == '-')
+			prev = cpu;
+		else
+			prev = -1;
+		if (n == 1 || sep == '\n')
+			break;
+	}
+
+	if (nr_cpus > 0)
+		cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
+	else
+		cpus = cpu_map__default_new();
+out_free_tmp:
+	free(tmp_cpus);
+	return cpus;
+}
+
+static struct cpu_map *cpu_map__read_all_cpu_map(void)
+{
+	struct cpu_map *cpus = NULL;
+	FILE *onlnf;
+
+	onlnf = fopen("/sys/devices/system/cpu/online", "r");
+	if (!onlnf)
+		return cpu_map__default_new();
+
+	cpus = cpu_map__read(onlnf);
+	fclose(onlnf);
+	return cpus;
+}
+
+struct cpu_map *cpu_map__new(const char *cpu_list)
+{
+	struct cpu_map *cpus = NULL;
+	unsigned long start_cpu, end_cpu = 0;
+	char *p = NULL;
+	int i, nr_cpus = 0;
+	int *tmp_cpus = NULL, *tmp;
+	int max_entries = 0;
+
+	if (!cpu_list)
+		return cpu_map__read_all_cpu_map();
+
+	/*
+	 * must handle the case of empty cpumap to cover
+	 * TOPOLOGY header for NUMA nodes with no CPU
+	 * ( e.g., because of CPU hotplug)
+	 */
+	if (!isdigit(*cpu_list) && *cpu_list != '\0')
+		goto out;
+
+	while (isdigit(*cpu_list)) {
+		p = NULL;
+		start_cpu = strtoul(cpu_list, &p, 0);
+		if (start_cpu >= INT_MAX
+		    || (*p != '\0' && *p != ',' && *p != '-'))
+			goto invalid;
+
+		if (*p == '-') {
+			cpu_list = ++p;
+			p = NULL;
+			end_cpu = strtoul(cpu_list, &p, 0);
+
+			if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
+				goto invalid;
+
+			if (end_cpu < start_cpu)
+				goto invalid;
+		} else {
+			end_cpu = start_cpu;
+		}
+
+		for (; start_cpu <= end_cpu; start_cpu++) {
+			/* check for duplicates */
+			for (i = 0; i < nr_cpus; i++)
+				if (tmp_cpus[i] == (int)start_cpu)
+					goto invalid;
+
+			if (nr_cpus == max_entries) {
+				max_entries += MAX_NR_CPUS;
+				tmp = realloc(tmp_cpus, max_entries * sizeof(int));
+				if (tmp == NULL)
+					goto invalid;
+				tmp_cpus = tmp;
+			}
+			tmp_cpus[nr_cpus++] = (int)start_cpu;
+		}
+		if (*p)
+			++p;
+
+		cpu_list = p;
+	}
+
+	if (nr_cpus > 0)
+		cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
+	else if (*cpu_list != '\0')
+		cpus = cpu_map__default_new();
+	else
+		cpus = cpu_map__dummy_new();
+invalid:
+	free(tmp_cpus);
+out:
+	return cpus;
+}
+
+static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
+{
+	struct cpu_map *map;
+
+	map = cpu_map__empty_new(cpus->nr);
+	if (map) {
+		unsigned i;
+
+		for (i = 0; i < cpus->nr; i++) {
+			/*
+			 * Special treatment for -1, which is not real cpu number,
+			 * and we need to use (int) -1 to initialize map[i],
+			 * otherwise it would become 65535.
+			 */
+			if (cpus->cpu[i] == (u16) -1)
+				map->map[i] = -1;
+			else
+				map->map[i] = (int) cpus->cpu[i];
+		}
+	}
+
+	return map;
+}
+
+static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask)
+{
+	struct cpu_map *map;
+	int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
+
+	nr = bitmap_weight(mask->mask, nbits);
+
+	map = cpu_map__empty_new(nr);
+	if (map) {
+		int cpu, i = 0;
+
+		for_each_set_bit(cpu, mask->mask, nbits)
+			map->map[i++] = cpu;
+	}
+	return map;
+
+}
+
+struct cpu_map *cpu_map__new_data(struct cpu_map_data *data)
+{
+	if (data->type == PERF_CPU_MAP__CPUS)
+		return cpu_map__from_entries((struct cpu_map_entries *)data->data);
+	else
+		return cpu_map__from_mask((struct cpu_map_mask *)data->data);
+}
+
+size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
+{
+#define BUFSIZE 1024
+	char buf[BUFSIZE];
+
+	cpu_map__snprint(map, buf, sizeof(buf));
+	return fprintf(fp, "%s\n", buf);
+#undef BUFSIZE
+}
+
+struct cpu_map *cpu_map__dummy_new(void)
+{
+	struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
+
+	if (cpus != NULL) {
+		cpus->nr = 1;
+		cpus->map[0] = -1;
+		refcount_set(&cpus->refcnt, 1);
+	}
+
+	return cpus;
+}
+
+struct cpu_map *cpu_map__empty_new(int nr)
+{
+	struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
+
+	if (cpus != NULL) {
+		int i;
+
+		cpus->nr = nr;
+		for (i = 0; i < nr; i++)
+			cpus->map[i] = -1;
+
+		refcount_set(&cpus->refcnt, 1);
+	}
+
+	return cpus;
+}
+
+static void cpu_map__delete(struct cpu_map *map)
+{
+	if (map) {
+		WARN_ONCE(refcount_read(&map->refcnt) != 0,
+			  "cpu_map refcnt unbalanced\n");
+		free(map);
+	}
+}
+
+struct cpu_map *cpu_map__get(struct cpu_map *map)
+{
+	if (map)
+		refcount_inc(&map->refcnt);
+	return map;
+}
+
+void cpu_map__put(struct cpu_map *map)
+{
+	if (map && refcount_dec_and_test(&map->refcnt))
+		cpu_map__delete(map);
+}
+
+static int cpu__get_topology_int(int cpu, const char *name, int *value)
+{
+	char path[PATH_MAX];
+
+	snprintf(path, PATH_MAX,
+		"devices/system/cpu/cpu%d/topology/%s", cpu, name);
+
+	return sysfs__read_int(path, value);
+}
+
+int cpu_map__get_socket_id(int cpu)
+{
+	int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
+	return ret ?: value;
+}
+
+int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
+{
+	int cpu;
+
+	if (idx > map->nr)
+		return -1;
+
+	cpu = map->map[idx];
+
+	return cpu_map__get_socket_id(cpu);
+}
+
+static int cmp_ids(const void *a, const void *b)
+{
+	return *(int *)a - *(int *)b;
+}
+
+int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
+		       int (*f)(struct cpu_map *map, int cpu, void *data),
+		       void *data)
+{
+	struct cpu_map *c;
+	int nr = cpus->nr;
+	int cpu, s1, s2;
+
+	/* allocate as much as possible */
+	c = calloc(1, sizeof(*c) + nr * sizeof(int));
+	if (!c)
+		return -1;
+
+	for (cpu = 0; cpu < nr; cpu++) {
+		s1 = f(cpus, cpu, data);
+		for (s2 = 0; s2 < c->nr; s2++) {
+			if (s1 == c->map[s2])
+				break;
+		}
+		if (s2 == c->nr) {
+			c->map[c->nr] = s1;
+			c->nr++;
+		}
+	}
+	/* ensure we process id in increasing order */
+	qsort(c->map, c->nr, sizeof(int), cmp_ids);
+
+	refcount_set(&c->refcnt, 1);
+	*res = c;
+	return 0;
+}
+
+int cpu_map__get_core_id(int cpu)
+{
+	int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
+	return ret ?: value;
+}
+
+int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
+{
+	int cpu, s;
+
+	if (idx > map->nr)
+		return -1;
+
+	cpu = map->map[idx];
+
+	cpu = cpu_map__get_core_id(cpu);
+
+	s = cpu_map__get_socket(map, idx, data);
+	if (s == -1)
+		return -1;
+
+	/*
+	 * encode socket in upper 16 bits
+	 * core_id is relative to socket, and
+	 * we need a global id. So we combine
+	 * socket+ core id
+	 */
+	return (s << 16) | (cpu & 0xffff);
+}
+
+int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
+{
+	return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
+}
+
+int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
+{
+	return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
+}
+
+/* setup simple routines to easily access node numbers given a cpu number */
+static int get_max_num(char *path, int *max)
+{
+	size_t num;
+	char *buf;
+	int err = 0;
+
+	if (filename__read_str(path, &buf, &num))
+		return -1;
+
+	buf[num] = '\0';
+
+	/* start on the right, to find highest node num */
+	while (--num) {
+		if ((buf[num] == ',') || (buf[num] == '-')) {
+			num++;
+			break;
+		}
+	}
+	if (sscanf(&buf[num], "%d", max) < 1) {
+		err = -1;
+		goto out;
+	}
+
+	/* convert from 0-based to 1-based */
+	(*max)++;
+
+out:
+	free(buf);
+	return err;
+}
+
+/* Determine highest possible cpu in the system for sparse allocation */
+static void set_max_cpu_num(void)
+{
+	const char *mnt;
+	char path[PATH_MAX];
+	int ret = -1;
+
+	/* set up default */
+	max_cpu_num = 4096;
+	max_present_cpu_num = 4096;
+
+	mnt = sysfs__mountpoint();
+	if (!mnt)
+		goto out;
+
+	/* get the highest possible cpu number for a sparse allocation */
+	ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
+	if (ret >= PATH_MAX) {
+		pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
+		goto out;
+	}
+
+	ret = get_max_num(path, &max_cpu_num);
+	if (ret)
+		goto out;
+
+	/* get the highest present cpu number for a sparse allocation */
+	ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
+	if (ret >= PATH_MAX) {
+		pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
+		goto out;
+	}
+
+	ret = get_max_num(path, &max_present_cpu_num);
+
+out:
+	if (ret)
+		pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
+}
+
+/* Determine highest possible node in the system for sparse allocation */
+static void set_max_node_num(void)
+{
+	const char *mnt;
+	char path[PATH_MAX];
+	int ret = -1;
+
+	/* set up default */
+	max_node_num = 8;
+
+	mnt = sysfs__mountpoint();
+	if (!mnt)
+		goto out;
+
+	/* get the highest possible cpu number for a sparse allocation */
+	ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
+	if (ret >= PATH_MAX) {
+		pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
+		goto out;
+	}
+
+	ret = get_max_num(path, &max_node_num);
+
+out:
+	if (ret)
+		pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
+}
+
+int cpu__max_node(void)
+{
+	if (unlikely(!max_node_num))
+		set_max_node_num();
+
+	return max_node_num;
+}
+
+int cpu__max_cpu(void)
+{
+	if (unlikely(!max_cpu_num))
+		set_max_cpu_num();
+
+	return max_cpu_num;
+}
+
+int cpu__max_present_cpu(void)
+{
+	if (unlikely(!max_present_cpu_num))
+		set_max_cpu_num();
+
+	return max_present_cpu_num;
+}
+
+
+int cpu__get_node(int cpu)
+{
+	if (unlikely(cpunode_map == NULL)) {
+		pr_debug("cpu_map not initialized\n");
+		return -1;
+	}
+
+	return cpunode_map[cpu];
+}
+
+static int init_cpunode_map(void)
+{
+	int i;
+
+	set_max_cpu_num();
+	set_max_node_num();
+
+	cpunode_map = calloc(max_cpu_num, sizeof(int));
+	if (!cpunode_map) {
+		pr_err("%s: calloc failed\n", __func__);
+		return -1;
+	}
+
+	for (i = 0; i < max_cpu_num; i++)
+		cpunode_map[i] = -1;
+
+	return 0;
+}
+
+int cpu__setup_cpunode_map(void)
+{
+	struct dirent *dent1, *dent2;
+	DIR *dir1, *dir2;
+	unsigned int cpu, mem;
+	char buf[PATH_MAX];
+	char path[PATH_MAX];
+	const char *mnt;
+	int n;
+
+	/* initialize globals */
+	if (init_cpunode_map())
+		return -1;
+
+	mnt = sysfs__mountpoint();
+	if (!mnt)
+		return 0;
+
+	n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
+	if (n >= PATH_MAX) {
+		pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
+		return -1;
+	}
+
+	dir1 = opendir(path);
+	if (!dir1)
+		return 0;
+
+	/* walk tree and setup map */
+	while ((dent1 = readdir(dir1)) != NULL) {
+		if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
+			continue;
+
+		n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
+		if (n >= PATH_MAX) {
+			pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
+			continue;
+		}
+
+		dir2 = opendir(buf);
+		if (!dir2)
+			continue;
+		while ((dent2 = readdir(dir2)) != NULL) {
+			if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
+				continue;
+			cpunode_map[cpu] = mem;
+		}
+		closedir(dir2);
+	}
+	closedir(dir1);
+	return 0;
+}
+
+bool cpu_map__has(struct cpu_map *cpus, int cpu)
+{
+	return cpu_map__idx(cpus, cpu) != -1;
+}
+
+int cpu_map__idx(struct cpu_map *cpus, int cpu)
+{
+	int i;
+
+	for (i = 0; i < cpus->nr; ++i) {
+		if (cpus->map[i] == cpu)
+			return i;
+	}
+
+	return -1;
+}
+
+int cpu_map__cpu(struct cpu_map *cpus, int idx)
+{
+	return cpus->map[idx];
+}
+
+size_t cpu_map__snprint(struct cpu_map *map, char *buf, size_t size)
+{
+	int i, cpu, start = -1;
+	bool first = true;
+	size_t ret = 0;
+
+#define COMMA first ? "" : ","
+
+	for (i = 0; i < map->nr + 1; i++) {
+		bool last = i == map->nr;
+
+		cpu = last ? INT_MAX : map->map[i];
+
+		if (start == -1) {
+			start = i;
+			if (last) {
+				ret += snprintf(buf + ret, size - ret,
+						"%s%d", COMMA,
+						map->map[i]);
+			}
+		} else if (((i - start) != (cpu - map->map[start])) || last) {
+			int end = i - 1;
+
+			if (start == end) {
+				ret += snprintf(buf + ret, size - ret,
+						"%s%d", COMMA,
+						map->map[start]);
+			} else {
+				ret += snprintf(buf + ret, size - ret,
+						"%s%d-%d", COMMA,
+						map->map[start], map->map[end]);
+			}
+			first = false;
+			start = i;
+		}
+	}
+
+#undef COMMA
+
+	pr_debug("cpumask list: %s\n", buf);
+	return ret;
+}
+
+static char hex_char(unsigned char val)
+{
+	if (val < 10)
+		return val + '0';
+	if (val < 16)
+		return val - 10 + 'a';
+	return '?';
+}
+
+size_t cpu_map__snprint_mask(struct cpu_map *map, char *buf, size_t size)
+{
+	int i, cpu;
+	char *ptr = buf;
+	unsigned char *bitmap;
+	int last_cpu = cpu_map__cpu(map, map->nr - 1);
+
+	if (buf == NULL)
+		return 0;
+
+	bitmap = zalloc(last_cpu / 8 + 1);
+	if (bitmap == NULL) {
+		buf[0] = '\0';
+		return 0;
+	}
+
+	for (i = 0; i < map->nr; i++) {
+		cpu = cpu_map__cpu(map, i);
+		bitmap[cpu / 8] |= 1 << (cpu % 8);
+	}
+
+	for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
+		unsigned char bits = bitmap[cpu / 8];
+
+		if (cpu % 8)
+			bits >>= 4;
+		else
+			bits &= 0xf;
+
+		*ptr++ = hex_char(bits);
+		if ((cpu % 32) == 0 && cpu > 0)
+			*ptr++ = ',';
+	}
+	*ptr = '\0';
+	free(bitmap);
+
+	buf[size - 1] = '\0';
+	return ptr - buf;
+}