1 files changed, 481 insertions, 0 deletions
diff --git a/tools/lib/perf/cpumap.c b/tools/lib/perf/cpumap.c
new file mode 100644
index 0000000000..2a5a292173
--- /dev/null
+++ b/tools/lib/perf/cpumap.c
@@ -0,0 +1,481 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <perf/cpumap.h>
+#include <stdlib.h>
+#include <linux/refcount.h>
+#include <internal/cpumap.h>
+#include <asm/bug.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <limits.h>
+
+void perf_cpu_map__set_nr(struct perf_cpu_map *map, int nr_cpus)
+{
+	RC_CHK_ACCESS(map)->nr = nr_cpus;
+}
+
+struct perf_cpu_map *perf_cpu_map__alloc(int nr_cpus)
+{
+	RC_STRUCT(perf_cpu_map) *cpus = malloc(sizeof(*cpus) + sizeof(struct perf_cpu) * nr_cpus);
+	struct perf_cpu_map *result;
+
+	if (ADD_RC_CHK(result, cpus)) {
+		cpus->nr = nr_cpus;
+		refcount_set(&cpus->refcnt, 1);
+	}
+	return result;
+}
+
+struct perf_cpu_map *perf_cpu_map__dummy_new(void)
+{
+	struct perf_cpu_map *cpus = perf_cpu_map__alloc(1);
+
+	if (cpus)
+		RC_CHK_ACCESS(cpus)->map[0].cpu = -1;
+
+	return cpus;
+}
+
+static void cpu_map__delete(struct perf_cpu_map *map)
+{
+	if (map) {
+		WARN_ONCE(refcount_read(perf_cpu_map__refcnt(map)) != 0,
+			  "cpu_map refcnt unbalanced\n");
+		RC_CHK_FREE(map);
+	}
+}
+
+struct perf_cpu_map *perf_cpu_map__get(struct perf_cpu_map *map)
+{
+	struct perf_cpu_map *result;
+
+	if (RC_CHK_GET(result, map))
+		refcount_inc(perf_cpu_map__refcnt(map));
+
+	return result;
+}
+
+void perf_cpu_map__put(struct perf_cpu_map *map)
+{
+	if (map) {
+		if (refcount_dec_and_test(perf_cpu_map__refcnt(map)))
+			cpu_map__delete(map);
+		else
+			RC_CHK_PUT(map);
+	}
+}
+
+static struct perf_cpu_map *cpu_map__default_new(void)
+{
+	struct perf_cpu_map *cpus;
+	int nr_cpus;
+
+	nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+	if (nr_cpus < 0)
+		return NULL;
+
+	cpus = perf_cpu_map__alloc(nr_cpus);
+	if (cpus != NULL) {
+		int i;
+
+		for (i = 0; i < nr_cpus; ++i)
+			RC_CHK_ACCESS(cpus)->map[i].cpu = i;
+	}
+
+	return cpus;
+}
+
+struct perf_cpu_map *perf_cpu_map__default_new(void)
+{
+	return cpu_map__default_new();
+}
+
+
+static int cmp_cpu(const void *a, const void *b)
+{
+	const struct perf_cpu *cpu_a = a, *cpu_b = b;
+
+	return cpu_a->cpu - cpu_b->cpu;
+}
+
+static struct perf_cpu __perf_cpu_map__cpu(const struct perf_cpu_map *cpus, int idx)
+{
+	return RC_CHK_ACCESS(cpus)->map[idx];
+}
+
+static struct perf_cpu_map *cpu_map__trim_new(int nr_cpus, const struct perf_cpu *tmp_cpus)
+{
+	size_t payload_size = nr_cpus * sizeof(struct perf_cpu);
+	struct perf_cpu_map *cpus = perf_cpu_map__alloc(nr_cpus);
+	int i, j;
+
+	if (cpus != NULL) {
+		memcpy(RC_CHK_ACCESS(cpus)->map, tmp_cpus, payload_size);
+		qsort(RC_CHK_ACCESS(cpus)->map, nr_cpus, sizeof(struct perf_cpu), cmp_cpu);
+		/* Remove dups */
+		j = 0;
+		for (i = 0; i < nr_cpus; i++) {
+			if (i == 0 ||
+			    __perf_cpu_map__cpu(cpus, i).cpu !=
+			    __perf_cpu_map__cpu(cpus, i - 1).cpu) {
+				RC_CHK_ACCESS(cpus)->map[j++].cpu =
+					__perf_cpu_map__cpu(cpus, i).cpu;
+			}
+		}
+		perf_cpu_map__set_nr(cpus, j);
+		assert(j <= nr_cpus);
+	}
+	return cpus;
+}
+
+struct perf_cpu_map *perf_cpu_map__read(FILE *file)
+{
+	struct perf_cpu_map *cpus = NULL;
+	int nr_cpus = 0;
+	struct perf_cpu *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;
+
+			WARN_ONCE(new_max >= MAX_NR_CPUS, "Perf can support %d CPUs. "
+							  "Consider raising MAX_NR_CPUS\n", MAX_NR_CPUS);
+
+			if (new_max >= max_entries) {
+				max_entries = new_max + MAX_NR_CPUS / 2;
+				tmp = realloc(tmp_cpus, max_entries * sizeof(struct perf_cpu));
+				if (tmp == NULL)
+					goto out_free_tmp;
+				tmp_cpus = tmp;
+			}
+
+			while (++prev < cpu)
+				tmp_cpus[nr_cpus++].cpu = prev;
+		}
+		if (nr_cpus == max_entries) {
+			max_entries += MAX_NR_CPUS;
+			tmp = realloc(tmp_cpus, max_entries * sizeof(struct perf_cpu));
+			if (tmp == NULL)
+				goto out_free_tmp;
+			tmp_cpus = tmp;
+		}
+
+		tmp_cpus[nr_cpus++].cpu = 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 perf_cpu_map *cpu_map__read_all_cpu_map(void)
+{
+	struct perf_cpu_map *cpus = NULL;
+	FILE *onlnf;
+
+	onlnf = fopen("/sys/devices/system/cpu/online", "r");
+	if (!onlnf)
+		return cpu_map__default_new();
+
+	cpus = perf_cpu_map__read(onlnf);
+	fclose(onlnf);
+	return cpus;
+}
+
+struct perf_cpu_map *perf_cpu_map__new(const char *cpu_list)
+{
+	struct perf_cpu_map *cpus = NULL;
+	unsigned long start_cpu, end_cpu = 0;
+	char *p = NULL;
+	int i, nr_cpus = 0;
+	struct perf_cpu *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;
+		}
+
+		WARN_ONCE(end_cpu >= MAX_NR_CPUS, "Perf can support %d CPUs. "
+						  "Consider raising MAX_NR_CPUS\n", MAX_NR_CPUS);
+
+		for (; start_cpu <= end_cpu; start_cpu++) {
+			/* check for duplicates */
+			for (i = 0; i < nr_cpus; i++)
+				if (tmp_cpus[i].cpu == (int)start_cpu)
+					goto invalid;
+
+			if (nr_cpus == max_entries) {
+				max_entries += MAX_NR_CPUS;
+				tmp = realloc(tmp_cpus, max_entries * sizeof(struct perf_cpu));
+				if (tmp == NULL)
+					goto invalid;
+				tmp_cpus = tmp;
+			}
+			tmp_cpus[nr_cpus++].cpu = (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 = perf_cpu_map__dummy_new();
+invalid:
+	free(tmp_cpus);
+out:
+	return cpus;
+}
+
+static int __perf_cpu_map__nr(const struct perf_cpu_map *cpus)
+{
+	return RC_CHK_ACCESS(cpus)->nr;
+}
+
+struct perf_cpu perf_cpu_map__cpu(const struct perf_cpu_map *cpus, int idx)
+{
+	struct perf_cpu result = {
+		.cpu = -1
+	};
+
+	if (cpus && idx < __perf_cpu_map__nr(cpus))
+		return __perf_cpu_map__cpu(cpus, idx);
+
+	return result;
+}
+
+int perf_cpu_map__nr(const struct perf_cpu_map *cpus)
+{
+	return cpus ? __perf_cpu_map__nr(cpus) : 1;
+}
+
+bool perf_cpu_map__empty(const struct perf_cpu_map *map)
+{
+	return map ? __perf_cpu_map__cpu(map, 0).cpu == -1 : true;
+}
+
+int perf_cpu_map__idx(const struct perf_cpu_map *cpus, struct perf_cpu cpu)
+{
+	int low, high;
+
+	if (!cpus)
+		return -1;
+
+	low = 0;
+	high = __perf_cpu_map__nr(cpus);
+	while (low < high) {
+		int idx = (low + high) / 2;
+		struct perf_cpu cpu_at_idx = __perf_cpu_map__cpu(cpus, idx);
+
+		if (cpu_at_idx.cpu == cpu.cpu)
+			return idx;
+
+		if (cpu_at_idx.cpu > cpu.cpu)
+			high = idx;
+		else
+			low = idx + 1;
+	}
+
+	return -1;
+}
+
+bool perf_cpu_map__has(const struct perf_cpu_map *cpus, struct perf_cpu cpu)
+{
+	return perf_cpu_map__idx(cpus, cpu) != -1;
+}
+
+bool perf_cpu_map__equal(const struct perf_cpu_map *lhs, const struct perf_cpu_map *rhs)
+{
+	int nr;
+
+	if (lhs == rhs)
+		return true;
+
+	if (!lhs || !rhs)
+		return false;
+
+	nr = __perf_cpu_map__nr(lhs);
+	if (nr != __perf_cpu_map__nr(rhs))
+		return false;
+
+	for (int idx = 0; idx < nr; idx++) {
+		if (__perf_cpu_map__cpu(lhs, idx).cpu != __perf_cpu_map__cpu(rhs, idx).cpu)
+			return false;
+	}
+	return true;
+}
+
+bool perf_cpu_map__has_any_cpu(const struct perf_cpu_map *map)
+{
+	return map && __perf_cpu_map__cpu(map, 0).cpu == -1;
+}
+
+struct perf_cpu perf_cpu_map__max(const struct perf_cpu_map *map)
+{
+	struct perf_cpu result = {
+		.cpu = -1
+	};
+
+	// cpu_map__trim_new() qsort()s it, cpu_map__default_new() sorts it as well.
+	return __perf_cpu_map__nr(map) > 0
+		? __perf_cpu_map__cpu(map, __perf_cpu_map__nr(map) - 1)
+		: result;
+}
+
+/** Is 'b' a subset of 'a'. */
+bool perf_cpu_map__is_subset(const struct perf_cpu_map *a, const struct perf_cpu_map *b)
+{
+	if (a == b || !b)
+		return true;
+	if (!a || __perf_cpu_map__nr(b) > __perf_cpu_map__nr(a))
+		return false;
+
+	for (int i = 0, j = 0; i < __perf_cpu_map__nr(a); i++) {
+		if (__perf_cpu_map__cpu(a, i).cpu > __perf_cpu_map__cpu(b, j).cpu)
+			return false;
+		if (__perf_cpu_map__cpu(a, i).cpu == __perf_cpu_map__cpu(b, j).cpu) {
+			j++;
+			if (j == __perf_cpu_map__nr(b))
+				return true;
+		}
+	}
+	return false;
+}
+
+/*
+ * Merge two cpumaps
+ *
+ * orig either gets freed and replaced with a new map, or reused
+ * with no reference count change (similar to "realloc")
+ * other has its reference count increased.
+ */
+
+struct perf_cpu_map *perf_cpu_map__merge(struct perf_cpu_map *orig,
+					 struct perf_cpu_map *other)
+{
+	struct perf_cpu *tmp_cpus;
+	int tmp_len;
+	int i, j, k;
+	struct perf_cpu_map *merged;
+
+	if (perf_cpu_map__is_subset(orig, other))
+		return orig;
+	if (perf_cpu_map__is_subset(other, orig)) {
+		perf_cpu_map__put(orig);
+		return perf_cpu_map__get(other);
+	}
+
+	tmp_len = __perf_cpu_map__nr(orig) + __perf_cpu_map__nr(other);
+	tmp_cpus = malloc(tmp_len * sizeof(struct perf_cpu));
+	if (!tmp_cpus)
+		return NULL;
+
+	/* Standard merge algorithm from wikipedia */
+	i = j = k = 0;
+	while (i < __perf_cpu_map__nr(orig) && j < __perf_cpu_map__nr(other)) {
+		if (__perf_cpu_map__cpu(orig, i).cpu <= __perf_cpu_map__cpu(other, j).cpu) {
+			if (__perf_cpu_map__cpu(orig, i).cpu == __perf_cpu_map__cpu(other, j).cpu)
+				j++;
+			tmp_cpus[k++] = __perf_cpu_map__cpu(orig, i++);
+		} else
+			tmp_cpus[k++] = __perf_cpu_map__cpu(other, j++);
+	}
+
+	while (i < __perf_cpu_map__nr(orig))
+		tmp_cpus[k++] = __perf_cpu_map__cpu(orig, i++);
+
+	while (j < __perf_cpu_map__nr(other))
+		tmp_cpus[k++] = __perf_cpu_map__cpu(other, j++);
+	assert(k <= tmp_len);
+
+	merged = cpu_map__trim_new(k, tmp_cpus);
+	free(tmp_cpus);
+	perf_cpu_map__put(orig);
+	return merged;
+}
+
+struct perf_cpu_map *perf_cpu_map__intersect(struct perf_cpu_map *orig,
+					     struct perf_cpu_map *other)
+{
+	struct perf_cpu *tmp_cpus;
+	int tmp_len;
+	int i, j, k;
+	struct perf_cpu_map *merged = NULL;
+
+	if (perf_cpu_map__is_subset(other, orig))
+		return perf_cpu_map__get(orig);
+	if (perf_cpu_map__is_subset(orig, other))
+		return perf_cpu_map__get(other);
+
+	tmp_len = max(__perf_cpu_map__nr(orig), __perf_cpu_map__nr(other));
+	tmp_cpus = malloc(tmp_len * sizeof(struct perf_cpu));
+	if (!tmp_cpus)
+		return NULL;
+
+	i = j = k = 0;
+	while (i < __perf_cpu_map__nr(orig) && j < __perf_cpu_map__nr(other)) {
+		if (__perf_cpu_map__cpu(orig, i).cpu < __perf_cpu_map__cpu(other, j).cpu)
+			i++;
+		else if (__perf_cpu_map__cpu(orig, i).cpu > __perf_cpu_map__cpu(other, j).cpu)
+			j++;
+		else {
+			j++;
+			tmp_cpus[k++] = __perf_cpu_map__cpu(orig, i++);
+		}
+	}
+	if (k)
+		merged = cpu_map__trim_new(k, tmp_cpus);
+	free(tmp_cpus);
+	return merged;
+}