[SRU][N][PATCH v3 1/2] libperf cpumap: Add any, empty and min helpers

[Mehmet Basaran]

From: Ian Rogers <irogers at google.com>

BugLink: https://bugs.launchpad.net/bugs/2107336

commit b6b4a62d8525c3093c3273dc6b2e6831adbfc4b2 upstream.

Additional helpers to better replace perf_cpu_map__has_any_cpu_or_is_empty().

Signed-off-by: Ian Rogers <irogers at google.com>
Acked-by: Namhyung Kim <namhyung at kernel.org>
Cc: Adrian Hunter <adrian.hunter at intel.com>
Cc: Alexander Shishkin <alexander.shishkin at linux.intel.com>
Cc: Alexandre Ghiti <alexghiti at rivosinc.com>
Cc: Andrew Jones <ajones at ventanamicro.com>
Cc: André Almeida <andrealmeid at igalia.com>
Cc: Athira Rajeev <atrajeev at linux.vnet.ibm.com>
Cc: Atish Patra <atishp at rivosinc.com>
Cc: Changbin Du <changbin.du at huawei.com>
Cc: Darren Hart <dvhart at infradead.org>
Cc: Davidlohr Bueso <dave at stgolabs.net>
Cc: Huacai Chen <chenhuacai at kernel.org>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: James Clark <james.clark at arm.com>
Cc: Jiri Olsa <jolsa at kernel.org>
Cc: John Garry <john.g.garry at oracle.com>
Cc: K Prateek Nayak <kprateek.nayak at amd.com>
Cc: Kajol Jain <kjain at linux.ibm.com>
Cc: Kan Liang <kan.liang at linux.intel.com>
Cc: Leo Yan <leo.yan at linaro.org>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Mike Leach <mike.leach at linaro.org>
Cc: Nick Desaulniers <ndesaulniers at google.com>
Cc: Paolo Bonzini <pbonzini at redhat.com>
Cc: Paran Lee <p4ranlee at gmail.com>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Ravi Bangoria <ravi.bangoria at amd.com>
Cc: Sandipan Das <sandipan.das at amd.com>
Cc: Sean Christopherson <seanjc at google.com>
Cc: Steinar H. Gunderson <sesse at google.com>
Cc: Suzuki Poulouse <suzuki.poulose at arm.com>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Will Deacon <will at kernel.org>
Cc: Yang Jihong <yangjihong1 at huawei.com>
Cc: Yang Li <yang.lee at linux.alibaba.com>
Cc: Yanteng Si <siyanteng at loongson.cn>
Link: https://lore.kernel.org/r/20240202234057.2085863-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme at redhat.com>
(cherry picked from commit b6b4a62d8525c3093c3273dc6b2e6831adbfc4b2)
Signed-off-by: Mehmet Basaran <mehmet.basaran at canonical.com>
---
 tools/lib/perf/cpumap.c              | 27 +++++++++++++++++++++++++++
 tools/lib/perf/include/perf/cpumap.h | 16 ++++++++++++++++
 tools/lib/perf/libperf.map           |  4 ++++
 3 files changed, 47 insertions(+)

diff --git a/tools/lib/perf/cpumap.c b/tools/lib/perf/cpumap.c
index 4adcd7920d03..ba49552952c5 100644
--- a/tools/lib/perf/cpumap.c
+++ b/tools/lib/perf/cpumap.c
@@ -316,6 +316,19 @@ bool perf_cpu_map__has_any_cpu_or_is_empty(const struct perf_cpu_map *map)
 	return map ? __perf_cpu_map__cpu(map, 0).cpu == -1 : true;
 }
 
+bool perf_cpu_map__is_any_cpu_or_is_empty(const struct perf_cpu_map *map)
+{
+	if (!map)
+		return true;
+
+	return __perf_cpu_map__nr(map) == 1 && __perf_cpu_map__cpu(map, 0).cpu == -1;
+}
+
+bool perf_cpu_map__is_empty(const struct perf_cpu_map *map)
+{
+	return map == NULL;
+}
+
 int perf_cpu_map__idx(const struct perf_cpu_map *cpus, struct perf_cpu cpu)
 {
 	int low, high;
@@ -372,6 +385,20 @@ 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__min(const struct perf_cpu_map *map)
+{
+	struct perf_cpu cpu, result = {
+		.cpu = -1
+	};
+	int idx;
+
+	perf_cpu_map__for_each_cpu_skip_any(cpu, idx, map) {
+		result = cpu;
+		break;
+	}
+	return result;
+}
+
 struct perf_cpu perf_cpu_map__max(const struct perf_cpu_map *map)
 {
 	struct perf_cpu result = {
diff --git a/tools/lib/perf/include/perf/cpumap.h b/tools/lib/perf/include/perf/cpumap.h
index 228c6c629b0c..90457d17fb2f 100644
--- a/tools/lib/perf/include/perf/cpumap.h
+++ b/tools/lib/perf/include/perf/cpumap.h
@@ -61,6 +61,22 @@ LIBPERF_API int perf_cpu_map__nr(const struct perf_cpu_map *cpus);
  * perf_cpu_map__has_any_cpu_or_is_empty - is map either empty or has the "any CPU"/dummy value.
  */
 LIBPERF_API bool perf_cpu_map__has_any_cpu_or_is_empty(const struct perf_cpu_map *map);
+/**
+ * perf_cpu_map__is_any_cpu_or_is_empty - is map either empty or the "any CPU"/dummy value.
+ */
+LIBPERF_API bool perf_cpu_map__is_any_cpu_or_is_empty(const struct perf_cpu_map *map);
+/**
+ * perf_cpu_map__is_empty - does the map contain no values and it doesn't
+ *                          contain the special "any CPU"/dummy value.
+ */
+LIBPERF_API bool perf_cpu_map__is_empty(const struct perf_cpu_map *map);
+/**
+ * perf_cpu_map__min - the minimum CPU value or -1 if empty or just the "any CPU"/dummy value.
+ */
+LIBPERF_API struct perf_cpu perf_cpu_map__min(const struct perf_cpu_map *map);
+/**
+ * perf_cpu_map__max - the maximum CPU value or -1 if empty or just the "any CPU"/dummy value.
+ */
 LIBPERF_API struct perf_cpu perf_cpu_map__max(const struct perf_cpu_map *map);
 LIBPERF_API bool perf_cpu_map__has(const struct perf_cpu_map *map, struct perf_cpu cpu);
 LIBPERF_API bool perf_cpu_map__equal(const struct perf_cpu_map *lhs,
diff --git a/tools/lib/perf/libperf.map b/tools/lib/perf/libperf.map
index 10b3f3722642..2aa79b696032 100644
--- a/tools/lib/perf/libperf.map
+++ b/tools/lib/perf/libperf.map
@@ -10,6 +10,10 @@ LIBPERF_0.0.1 {
 		perf_cpu_map__nr;
 		perf_cpu_map__cpu;
 		perf_cpu_map__has_any_cpu_or_is_empty;
+		perf_cpu_map__is_any_cpu_or_is_empty;
+		perf_cpu_map__is_empty;
+		perf_cpu_map__has_any_cpu;
+		perf_cpu_map__min;
 		perf_cpu_map__max;
 		perf_cpu_map__has;
 		perf_thread_map__new_array;
-- 
2.43.0