v4.19.13 snapshot.
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
new file mode 100644
index 0000000..1f3ccc3
--- /dev/null
+++ b/tools/perf/util/env.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_ENV_H
+#define __PERF_ENV_H
+
+#include <linux/types.h>
+#include "cpumap.h"
+
+struct cpu_topology_map {
+ int socket_id;
+ int core_id;
+};
+
+struct cpu_cache_level {
+ u32 level;
+ u32 line_size;
+ u32 sets;
+ u32 ways;
+ char *type;
+ char *size;
+ char *map;
+};
+
+struct numa_node {
+ u32 node;
+ u64 mem_total;
+ u64 mem_free;
+ struct cpu_map *map;
+};
+
+struct memory_node {
+ u64 node;
+ u64 size;
+ unsigned long *set;
+};
+
+struct perf_env {
+ char *hostname;
+ char *os_release;
+ char *version;
+ char *arch;
+ int nr_cpus_online;
+ int nr_cpus_avail;
+ char *cpu_desc;
+ char *cpuid;
+ unsigned long long total_mem;
+ unsigned int msr_pmu_type;
+
+ int nr_cmdline;
+ int nr_sibling_cores;
+ int nr_sibling_threads;
+ int nr_numa_nodes;
+ int nr_memory_nodes;
+ int nr_pmu_mappings;
+ int nr_groups;
+ char *cmdline;
+ const char **cmdline_argv;
+ char *sibling_cores;
+ char *sibling_threads;
+ char *pmu_mappings;
+ struct cpu_topology_map *cpu;
+ struct cpu_cache_level *caches;
+ int caches_cnt;
+ struct numa_node *numa_nodes;
+ struct memory_node *memory_nodes;
+ unsigned long long memory_bsize;
+};
+
+extern struct perf_env perf_env;
+
+void perf_env__exit(struct perf_env *env);
+
+int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[]);
+
+int perf_env__read_cpu_topology_map(struct perf_env *env);
+
+void cpu_cache_level__free(struct cpu_cache_level *cache);
+
+const char *perf_env__arch(struct perf_env *env);
+const char *perf_env__raw_arch(struct perf_env *env);
+int perf_env__nr_cpus_avail(struct perf_env *env);
+
+#endif /* __PERF_ENV_H */