perf kvm: Support printing attributions for dimensions

This patch adds header, entry callback and width for every dimension,
thus in TUI mode the tool can print items with the defined attributions.
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230315145112.186603-2-leo.yan@linaro.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-kvm.c

@@ -84,8 +84,12 @@ struct kvm_hists {
 
 struct kvm_dimension {
 	const char *name;
+	const char *header;
+	int width;
 	int64_t (*cmp)(struct perf_hpp_fmt *fmt, struct hist_entry *left,
 		       struct hist_entry *right);
+	int (*entry)(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+		     struct hist_entry *he);
 };
 
 struct kvm_fmt {
@@ -103,9 +107,24 @@ static int64_t ev_name_cmp(struct perf_hpp_fmt *fmt __maybe_unused,
 	return -strcmp(left->kvm_info->name, right->kvm_info->name);
 }
 
+static int fmt_width(struct perf_hpp_fmt *fmt,
+		     struct perf_hpp *hpp __maybe_unused,
+		     struct hists *hists __maybe_unused);
+
+static int ev_name_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+			 struct hist_entry *he)
+{
+	int width = fmt_width(fmt, hpp, he->hists);
+
+	return scnprintf(hpp->buf, hpp->size, "%*s", width, he->kvm_info->name);
+}
+
 static struct kvm_dimension dim_event = {
+	.header		= "Event name",
 	.name		= "ev_name",
 	.cmp		= ev_name_cmp,
+	.entry		= ev_name_entry,
+	.width		= 40,
 };
 
 #define EV_METRIC_CMP(metric)						\
@@ -131,29 +150,77 @@ EV_METRIC_CMP(max)
 EV_METRIC_CMP(min)
 EV_METRIC_CMP(mean)
 
+#define EV_METRIC_ENTRY(metric)						\
+static int ev_entry_##metric(struct perf_hpp_fmt *fmt,			\
+			     struct perf_hpp *hpp,			\
+			     struct hist_entry *he)			\
+{									\
+	struct kvm_event *event;					\
+	int width = fmt_width(fmt, hpp, he->hists);			\
+	struct perf_kvm_stat *perf_kvm;					\
+									\
+	event = container_of(he, struct kvm_event, he);			\
+	perf_kvm = event->perf_kvm;					\
+	return scnprintf(hpp->buf, hpp->size, "%*lu", width,		\
+		get_event_##metric(event, perf_kvm->trace_vcpu));	\
+}
+
+EV_METRIC_ENTRY(time)
+EV_METRIC_ENTRY(count)
+EV_METRIC_ENTRY(max)
+EV_METRIC_ENTRY(min)
+
 static struct kvm_dimension dim_time = {
+	.header		= "Time (ns)",
 	.name		= "time",
 	.cmp		= ev_cmp_time,
+	.entry		= ev_entry_time,
+	.width		= 12,
 };
 
 static struct kvm_dimension dim_count = {
+	.header		= "Samples",
 	.name		= "sample",
 	.cmp		= ev_cmp_count,
+	.entry		= ev_entry_count,
+	.width		= 12,
 };
 
 static struct kvm_dimension dim_max_time = {
+	.header		= "Max Time (ns)",
 	.name		= "max_t",
 	.cmp		= ev_cmp_max,
+	.entry		= ev_entry_max,
+	.width		= 14,
 };
 
 static struct kvm_dimension dim_min_time = {
+	.header		= "Min Time (ns)",
 	.name		= "min_t",
 	.cmp		= ev_cmp_min,
+	.entry		= ev_entry_min,
+	.width		= 14,
 };
 
+static int ev_entry_mean(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+			 struct hist_entry *he)
+{
+	struct kvm_event *event;
+	int width = fmt_width(fmt, hpp, he->hists);
+	struct perf_kvm_stat *perf_kvm;
+
+	event = container_of(he, struct kvm_event, he);
+	perf_kvm = event->perf_kvm;
+	return scnprintf(hpp->buf, hpp->size, "%*lu", width,
+			 get_event_mean(event, perf_kvm->trace_vcpu));
+}
+
 static struct kvm_dimension dim_mean_time = {
+	.header		= "Mean Time (ns)",
 	.name		= "mean_t",
 	.cmp		= ev_cmp_mean,
+	.entry		= ev_entry_mean,
+	.width		= 14,
 };
 
 static struct kvm_dimension *dimensions[] = {
@@ -166,6 +233,30 @@ static struct kvm_dimension *dimensions[] = {
 	NULL,
 };
 
+static int fmt_width(struct perf_hpp_fmt *fmt,
+		     struct perf_hpp *hpp __maybe_unused,
+		     struct hists *hists __maybe_unused)
+{
+	struct kvm_fmt *kvm_fmt;
+
+	kvm_fmt = container_of(fmt, struct kvm_fmt, fmt);
+	return kvm_fmt->dim->width;
+}
+
+static int fmt_header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+		      struct hists *hists, int line __maybe_unused,
+		      int *span __maybe_unused)
+{
+	struct kvm_fmt *kvm_fmt;
+	struct kvm_dimension *dim;
+	int width = fmt_width(fmt, hpp, hists);
+
+	kvm_fmt = container_of(fmt, struct kvm_fmt, fmt);
+	dim = kvm_fmt->dim;
+
+	return scnprintf(hpp->buf, hpp->size, "%*s", width, dim->header);
+}
+
 static bool fmt_equal(struct perf_hpp_fmt *a, struct perf_hpp_fmt *b)
 {
 	struct kvm_fmt *kvm_fmt_a = container_of(a, struct kvm_fmt, fmt);
@@ -215,9 +306,9 @@ static struct kvm_fmt *get_format(const char *name)
 	fmt->cmp	= dim->cmp;
 	fmt->sort	= dim->cmp;
 	fmt->color	= NULL;
-	fmt->entry	= NULL;
-	fmt->header	= NULL;
-	fmt->width	= NULL;
+	fmt->entry	= dim->entry;
+	fmt->header	= fmt_header;
+	fmt->width	= fmt_width;
 	fmt->collapse	= dim->cmp;
 	fmt->equal	= fmt_equal;
 	fmt->free	= fmt_free;