perf util: Create branch.c/.h for common branch functions

Create new util/branch.c and util/branch.h to contain the common branch
functions. Such as:

branch_type_count(): Count the numbers of branch types
branch_type_name() : Return the name of branch type
branch_type_stat_display(): Display branch type statistics info
branch_type_str(): Construct the branch type string.

The branch type is saved in branch_flags.

Change log:

v8: Change PERF_BR_NONE to PERF_BR_UNKNOWN.

v7: Since the common branch type name is changed (e.g. JCC->COND),
    this patch is performed the modification accordingly.

v6: Move that multiline conditional code inside {} brackets.
    Move branch_type_stat_display() from builtin-report.c to
      branch.c.
    Move branch_type_str() from callchain.c to branch.c.

v5: It's a new patch in v5 patch series.

Signed-off-by: Yao Jin <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1500379995-6449-6-git-send-email-yao.jin@linux.intel.com
[ Don't use 'index' and 'stat' as names for variables, it shadows global decls in older distros ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 174 insertions, 1 deletions

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 7580fe4d5d30..8d49a989f193 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -93,6 +93,7 @@ libperf-y += drv_configs.o
 libperf-y += units.o
 libperf-y += time-utils.o
 libperf-y += expr-bison.o
+libperf-y += branch.o
 
 libperf-$(CONFIG_LIBBPF) += bpf-loader.o
 libperf-$(CONFIG_BPF_PROLOGUE) += bpf-prologue.o
diff --git a/tools/perf/util/branch.c b/tools/perf/util/branch.c
new file mode 100644
index 000000000000..a4fce2729e50
--- /dev/null
+++ b/tools/perf/util/branch.c
@@ -0,0 +1,147 @@
+#include "perf.h"
+#include "util/util.h"
+#include "util/debug.h"
+#include "util/branch.h"
+
+static bool cross_area(u64 addr1, u64 addr2, int size)
+{
+        u64 align1, align2;
+
+        align1 = addr1 & ~(size - 1);
+        align2 = addr2 & ~(size - 1);
+
+        return (align1 != align2) ? true : false;
+}
+
+#define AREA_4K         4096
+#define AREA_2M         (2 * 1024 * 1024)
+
+void branch_type_count(struct branch_type_stat *st, struct branch_flags *flags,
+                       u64 from, u64 to)
+{
+        if (flags->type == PERF_BR_UNKNOWN || from == 0)
+                return;
+
+        st->counts[flags->type]++;
+
+        if (flags->type == PERF_BR_COND) {
+                if (to > from)
+                        st->cond_fwd++;
+                else
+                        st->cond_bwd++;
+        }
+
+        if (cross_area(from, to, AREA_2M))
+                st->cross_2m++;
+        else if (cross_area(from, to, AREA_4K))
+                st->cross_4k++;
+}
+
+const char *branch_type_name(int type)
+{
+        const char *branch_names[PERF_BR_MAX] = {
+                "N/A",
+                "COND",
+                "UNCOND",
+                "IND",
+                "CALL",
+                "IND_CALL",
+                "RET",
+                "SYSCALL",
+                "SYSRET",
+                "COND_CALL",
+                "COND_RET"
+        };
+
+        if (type >= 0 && type < PERF_BR_MAX)
+                return branch_names[type];
+
+        return NULL;
+}
+
+void branch_type_stat_display(FILE *fp, struct branch_type_stat *st)
+{
+        u64 total = 0;
+        int i;
+
+        for (i = 0; i < PERF_BR_MAX; i++)
+                total += st->counts[i];
+
+        if (total == 0)
+                return;
+
+        fprintf(fp, "\n#");
+        fprintf(fp, "\n# Branch Statistics:");
+        fprintf(fp, "\n#");
+
+        if (st->cond_fwd > 0) {
+                fprintf(fp, "\n%8s: %5.1f%%",
+                        "COND_FWD",
+                        100.0 * (double)st->cond_fwd / (double)total);
+        }
+
+        if (st->cond_bwd > 0) {
+                fprintf(fp, "\n%8s: %5.1f%%",
+                        "COND_BWD",
+                        100.0 * (double)st->cond_bwd / (double)total);
+        }
+
+        if (st->cross_4k > 0) {
+                fprintf(fp, "\n%8s: %5.1f%%",
+                        "CROSS_4K",
+                        100.0 * (double)st->cross_4k / (double)total);
+        }
+
+        if (st->cross_2m > 0) {
+                fprintf(fp, "\n%8s: %5.1f%%",
+                        "CROSS_2M",
+                        100.0 * (double)st->cross_2m / (double)total);
+        }
+
+        for (i = 0; i < PERF_BR_MAX; i++) {
+                if (st->counts[i] > 0)
+                        fprintf(fp, "\n%8s: %5.1f%%",
+                                branch_type_name(i),
+                                100.0 *
+                                (double)st->counts[i] / (double)total);
+        }
+}
+
+static int count_str_scnprintf(int idx, const char *str, char *bf, int size)
+{
+        return scnprintf(bf, size, "%s%s", (idx) ? " " : " (", str);
+}
+
+int branch_type_str(struct branch_type_stat *st, char *bf, int size)
+{
+        int i, j = 0, printed = 0;
+        u64 total = 0;
+
+        for (i = 0; i < PERF_BR_MAX; i++)
+                total += st->counts[i];
+
+        if (total == 0)
+                return 0;
+
+        if (st->cond_fwd > 0)
+                printed += count_str_scnprintf(j++, "COND_FWD", bf + printed, size - printed);
+
+        if (st->cond_bwd > 0)
+                printed += count_str_scnprintf(j++, "COND_BWD", bf + printed, size - printed);
+
+        for (i = 0; i < PERF_BR_MAX; i++) {
+                if (i == PERF_BR_COND)
+                        continue;
+
+                if (st->counts[i] > 0)
+                        printed += count_str_scnprintf(j++, branch_type_name(i), bf + printed, size - printed);
+        }
+
+        if (st->cross_4k > 0)
+                printed += count_str_scnprintf(j++, "CROSS_4K", bf + printed, size - printed);
+
+        if (st->cross_2m > 0)
+                printed += count_str_scnprintf(j++, "CROSS_2M", bf + printed, size - printed);
+
+        return printed;
+}
diff --git a/tools/perf/util/branch.h b/tools/perf/util/branch.h
new file mode 100644
index 000000000000..686f2b65ba84
--- /dev/null
+++ b/tools/perf/util/branch.h
@@ -0,0 +1,24 @@
+#ifndef _PERF_BRANCH_H
+#define _PERF_BRANCH_H 1
+
+#include <stdint.h>
+#include "../perf.h"
+
+struct branch_type_stat {
+        u64 counts[PERF_BR_MAX];
+        u64 cond_fwd;
+        u64 cond_bwd;
+        u64 cross_4k;
+        u64 cross_2m;
+};
+
+struct branch_flags;
+
+void branch_type_count(struct branch_type_stat *st, struct branch_flags *flags,
+                       u64 from, u64 to);
+
+const char *branch_type_name(int type);
+void branch_type_stat_display(FILE *fp, struct branch_type_stat *st);
+int branch_type_str(struct branch_type_stat *st, char *bf, int bfsize);
+
+#endif /* _PERF_BRANCH_H */
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 37c5fafb549c..423ac82605f3 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -142,7 +142,8 @@ struct branch_flags {
         u64 in_tx:1;
         u64 abort:1;
         u64 cycles:16;
-        u64 reserved:44;
+        u64 type:4;
+        u64 reserved:40;
 };
 
 struct branch_entry {