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Subject[PATCH 09/10] perf tools: Add perf_topo_cpu object
Date
Making struct cpu_topo global and renaming it to
struct perf_topo_cpu, so it can be used from record
command in following patches.

Adding following interface functions to load/free
cpu topology details:
struct perf_topo_cpu *perf_topo_cpu__new(void);
void perf_topo_cpu__free(struct perf_topo_cpu *tp);

Moving it into separate object file cputopo.c together
with numa related object in following patches.

No functional change, the new interface will be used
in upcoming changes.

Link: http://lkml.kernel.org/n/tip-4g1sdzg0bvd5la96xw06y3en@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/util/Build | 1 +
tools/perf/util/cputopo.c | 144 ++++++++++++++++++++++++++++++++++++
tools/perf/util/cputopo.h | 17 +++++
tools/perf/util/header.c | 150 +-------------------------------------
4 files changed, 166 insertions(+), 146 deletions(-)
create mode 100644 tools/perf/util/cputopo.c
create mode 100644 tools/perf/util/cputopo.h

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index ca0741c91903..3008d49fa587 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -69,6 +69,7 @@ perf-y += hist.o
perf-y += util.o
perf-y += xyarray.o
perf-y += cpumap.o
+perf-y += cputopo.o
perf-y += cgroup.o
perf-y += target.o
perf-y += rblist.o
diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
new file mode 100644
index 000000000000..43e5e3292c34
--- /dev/null
+++ b/tools/perf/util/cputopo.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <sys/param.h>
+
+#include "cputopo.h"
+#include "cpumap.h"
+#include "util.h"
+
+
+#define CORE_SIB_FMT \
+ "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
+#define THRD_SIB_FMT \
+ "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
+
+static int build_perf_topo_cpu(struct perf_topo_cpu *tp, int cpu)
+{
+ FILE *fp;
+ char filename[MAXPATHLEN];
+ char *buf = NULL, *p;
+ size_t len = 0;
+ ssize_t sret;
+ u32 i = 0;
+ int ret = -1;
+
+ sprintf(filename, CORE_SIB_FMT, cpu);
+ fp = fopen(filename, "r");
+ if (!fp)
+ goto try_threads;
+
+ sret = getline(&buf, &len, fp);
+ fclose(fp);
+ if (sret <= 0)
+ goto try_threads;
+
+ p = strchr(buf, '\n');
+ if (p)
+ *p = '\0';
+
+ for (i = 0; i < tp->core_sib; i++) {
+ if (!strcmp(buf, tp->core_siblings[i]))
+ break;
+ }
+ if (i == tp->core_sib) {
+ tp->core_siblings[i] = buf;
+ tp->core_sib++;
+ buf = NULL;
+ len = 0;
+ }
+ ret = 0;
+
+try_threads:
+ sprintf(filename, THRD_SIB_FMT, cpu);
+ fp = fopen(filename, "r");
+ if (!fp)
+ goto done;
+
+ if (getline(&buf, &len, fp) <= 0)
+ goto done;
+
+ p = strchr(buf, '\n');
+ if (p)
+ *p = '\0';
+
+ for (i = 0; i < tp->thread_sib; i++) {
+ if (!strcmp(buf, tp->thread_siblings[i]))
+ break;
+ }
+ if (i == tp->thread_sib) {
+ tp->thread_siblings[i] = buf;
+ tp->thread_sib++;
+ buf = NULL;
+ }
+ ret = 0;
+done:
+ if (fp)
+ fclose(fp);
+ free(buf);
+ return ret;
+}
+
+void perf_topo_cpu__free(struct perf_topo_cpu *tp)
+{
+ u32 i;
+
+ if (!tp)
+ return;
+
+ for (i = 0 ; i < tp->core_sib; i++)
+ zfree(&tp->core_siblings[i]);
+
+ for (i = 0 ; i < tp->thread_sib; i++)
+ zfree(&tp->thread_siblings[i]);
+
+ free(tp);
+}
+
+struct perf_topo_cpu *perf_topo_cpu__new(void)
+{
+ struct perf_topo_cpu *tp = NULL;
+ void *addr;
+ u32 nr, i;
+ size_t sz;
+ long ncpus;
+ int ret = -1;
+ struct cpu_map *map;
+
+ ncpus = cpu__max_present_cpu();
+
+ /* build online CPU map */
+ map = cpu_map__new(NULL);
+ if (map == NULL) {
+ pr_debug("failed to get system cpumap\n");
+ return NULL;
+ }
+
+ nr = (u32)(ncpus & UINT_MAX);
+
+ sz = nr * sizeof(char *);
+ addr = calloc(1, sizeof(*tp) + 2 * sz);
+ if (!addr)
+ goto out_free;
+
+ tp = addr;
+ addr += sizeof(*tp);
+ tp->core_siblings = addr;
+ addr += sz;
+ tp->thread_siblings = addr;
+
+ for (i = 0; i < nr; i++) {
+ if (!cpu_map__has(map, i))
+ continue;
+
+ ret = build_perf_topo_cpu(tp, i);
+ if (ret < 0)
+ break;
+ }
+
+out_free:
+ cpu_map__put(map);
+ if (ret) {
+ perf_topo_cpu__free(tp);
+ tp = NULL;
+ }
+ return tp;
+}
diff --git a/tools/perf/util/cputopo.h b/tools/perf/util/cputopo.h
new file mode 100644
index 000000000000..764e7f5289d8
--- /dev/null
+++ b/tools/perf/util/cputopo.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_CPUTOPO_H
+#define __PERF_CPUTOPO_H
+
+#include <linux/types.h>
+
+struct perf_topo_cpu {
+ u32 core_sib;
+ u32 thread_sib;
+ char **core_siblings;
+ char **thread_siblings;
+};
+
+struct perf_topo_cpu *perf_topo_cpu__new(void);
+void perf_topo_cpu__free(struct perf_topo_cpu *tp);
+
+#endif /* __PERF_CPUTOPO_H */
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index c66f26ec557a..bf285319c5cd 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -39,6 +39,7 @@
#include "tool.h"
#include "time-utils.h"
#include "units.h"
+#include "cputopo.h"

#include "sane_ctype.h"

@@ -557,158 +558,15 @@ static int write_cmdline(struct feat_fd *ff,
return 0;
}

-#define CORE_SIB_FMT \
- "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
-#define THRD_SIB_FMT \
- "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
-
-struct cpu_topo {
- u32 core_sib;
- u32 thread_sib;
- char **core_siblings;
- char **thread_siblings;
-};
-
-static int build_cpu_topo(struct cpu_topo *tp, int cpu)
-{
- FILE *fp;
- char filename[MAXPATHLEN];
- char *buf = NULL, *p;
- size_t len = 0;
- ssize_t sret;
- u32 i = 0;
- int ret = -1;
-
- sprintf(filename, CORE_SIB_FMT, cpu);
- fp = fopen(filename, "r");
- if (!fp)
- goto try_threads;
-
- sret = getline(&buf, &len, fp);
- fclose(fp);
- if (sret <= 0)
- goto try_threads;
-
- p = strchr(buf, '\n');
- if (p)
- *p = '\0';
-
- for (i = 0; i < tp->core_sib; i++) {
- if (!strcmp(buf, tp->core_siblings[i]))
- break;
- }
- if (i == tp->core_sib) {
- tp->core_siblings[i] = buf;
- tp->core_sib++;
- buf = NULL;
- len = 0;
- }
- ret = 0;
-
-try_threads:
- sprintf(filename, THRD_SIB_FMT, cpu);
- fp = fopen(filename, "r");
- if (!fp)
- goto done;
-
- if (getline(&buf, &len, fp) <= 0)
- goto done;
-
- p = strchr(buf, '\n');
- if (p)
- *p = '\0';
-
- for (i = 0; i < tp->thread_sib; i++) {
- if (!strcmp(buf, tp->thread_siblings[i]))
- break;
- }
- if (i == tp->thread_sib) {
- tp->thread_siblings[i] = buf;
- tp->thread_sib++;
- buf = NULL;
- }
- ret = 0;
-done:
- if(fp)
- fclose(fp);
- free(buf);
- return ret;
-}
-
-static void free_cpu_topo(struct cpu_topo *tp)
-{
- u32 i;
-
- if (!tp)
- return;
-
- for (i = 0 ; i < tp->core_sib; i++)
- zfree(&tp->core_siblings[i]);
-
- for (i = 0 ; i < tp->thread_sib; i++)
- zfree(&tp->thread_siblings[i]);
-
- free(tp);
-}
-
-static struct cpu_topo *build_cpu_topology(void)
-{
- struct cpu_topo *tp = NULL;
- void *addr;
- u32 nr, i;
- size_t sz;
- long ncpus;
- int ret = -1;
- struct cpu_map *map;
-
- ncpus = cpu__max_present_cpu();
-
- /* build online CPU map */
- map = cpu_map__new(NULL);
- if (map == NULL) {
- pr_debug("failed to get system cpumap\n");
- return NULL;
- }
-
- nr = (u32)(ncpus & UINT_MAX);
-
- sz = nr * sizeof(char *);
- addr = calloc(1, sizeof(*tp) + 2 * sz);
- if (!addr)
- goto out_free;
-
- tp = addr;
- addr += sizeof(*tp);
- tp->core_siblings = addr;
- addr += sz;
- tp->thread_siblings = addr;
-
- for (i = 0; i < nr; i++) {
- if (!cpu_map__has(map, i))
- continue;
-
- ret = build_cpu_topo(tp, i);
- if (ret < 0)
- break;
- }
-
-out_free:
- cpu_map__put(map);
- if (ret) {
- free_cpu_topo(tp);
- tp = NULL;
- }
- return tp;
-}

static int write_cpu_topology(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
- struct cpu_topo *tp;
+ struct perf_topo_cpu *tp;
u32 i;
int ret, j;

- tp = build_cpu_topology();
+ tp = perf_topo_cpu__new();
if (!tp)
return -1;

@@ -746,7 +604,7 @@ static int write_cpu_topology(struct feat_fd *ff,
return ret;
}
done:
- free_cpu_topo(tp);
+ perf_topo_cpu__free(tp);
return ret;
}

--
2.17.2
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