libperf: Add perf_evlist and perf_evsel structs

Add the perf_evlist and perf_evsel structs to libperf.

It's added as a declarations into:

  include/perf/evlist.h
  include/perf/evsel.h

which will be included by users.

The definitions are added into:

  include/internal/evlist.h
  include/internal/evsel.h

which is not to be included by users, but shared
within perf and libperf.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-35-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/Build

 libperf-y += core.o
 libperf-y += cpumap.o
 libperf-y += threadmap.o
+libperf-y += evsel.o
+libperf-y += evlist.o

tools/perf/lib/evlist.c

+// SPDX-License-Identifier: GPL-2.0
+#include <perf/evlist.h>
+#include <linux/list.h>
+#include <internal/evlist.h>

tools/perf/lib/evsel.c

+// SPDX-License-Identifier: GPL-2.0
+#include <perf/evsel.h>
+#include <linux/list.h>
+#include <internal/evsel.h>

tools/perf/lib/include/internal/evlist.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LIBPERF_INTERNAL_EVLIST_H
+#define __LIBPERF_INTERNAL_EVLIST_H
+
+struct perf_evlist {
+	struct list_head	entries;
+};
+
+#endif /* __LIBPERF_INTERNAL_EVLIST_H */

tools/perf/lib/include/internal/evsel.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LIBPERF_INTERNAL_EVSEL_H
+#define __LIBPERF_INTERNAL_EVSEL_H
+
+struct perf_evsel {
+	struct list_head	node;
+};
+
+#endif /* __LIBPERF_INTERNAL_EVSEL_H */

tools/perf/lib/include/perf/evlist.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LIBPERF_EVLIST_H
+#define __LIBPERF_EVLIST_H
+
+struct perf_evlist;
+
+#endif /* __LIBPERF_EVLIST_H */

tools/perf/lib/include/perf/evsel.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LIBPERF_EVSEL_H
+#define __LIBPERF_EVSEL_H
+
+struct perf_evsel;
+
+#endif /* __LIBPERF_EVSEL_H */