[PATCH v4 4/4] perf tools: Support "branch-misses:pp" on arm64

[James Clark <james.clark@arm.com>]

From: Tan Xiaojun <tanxiaojun@huawei.com>

At the suggestion of James Clark, use spe to support the precise
ip of some events. Currently its support event is:
branch-misses.

Example usage:

$ ./perf record -e branch-misses:pp dd if=/dev/zero of=/dev/null count=10000
(:p/pp/ppp is same for this case.)

$ ./perf report --stdio
("--stdio is not necessary")

--------------------------------------------------------------------
...
 # Samples: 14  of event 'branch-misses:pp'
 # Event count (approx.): 14
 #
 # Children      Self  Command  Shared Object      Symbol
 # ........  ........  .......  .................  ..........................
 #
    14.29%    14.29%  dd       [kernel.kallsyms]  [k] __arch_copy_from_user
    14.29%    14.29%  dd       libc-2.28.so       [.] _dl_addr
     7.14%     7.14%  dd       [kernel.kallsyms]  [k] __free_pages
     7.14%     7.14%  dd       [kernel.kallsyms]  [k] __pi_memcpy
     7.14%     7.14%  dd       [kernel.kallsyms]  [k] pagecache_get_page
     7.14%     7.14%  dd       [kernel.kallsyms]  [k] unmap_single_vma
     7.14%     7.14%  dd       dd                 [.] 0x00000000000025ec
     7.14%     7.14%  dd       ld-2.28.so         [.] _dl_lookup_symbol_x
     7.14%     7.14%  dd       ld-2.28.so         [.] check_match
     7.14%     7.14%  dd       libc-2.28.so       [.] __mpn_rshift
     7.14%     7.14%  dd       libc-2.28.so       [.] _nl_intern_locale_data
     7.14%     7.14%  dd       libc-2.28.so       [.] read_alias_file
...
--------------------------------------------------------------------

Signed-off-by: Tan Xiaojun <tanxiaojun@huawei.com>
Suggested-by: James Clark <James.Clark@arm.com>
Tested-by: Qi Liu <liuqi115@hisilicon.com>
Signed-off-by: James Clark <james.clark@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Tan Xiaojun <tanxiaojun@huawei.com>
Cc: Al Grant <al.grant@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/arch/arm/util/auxtrace.c | 38 +++++++++++++++++++++++++++++
 tools/perf/builtin-record.c         |  5 ++++
 tools/perf/util/arm-spe.c           |  9 +++++++
 tools/perf/util/arm-spe.h           |  3 +++
 tools/perf/util/auxtrace.h          |  6 +++++
 5 files changed, 61 insertions(+)

diff --git a/tools/perf/arch/arm/util/auxtrace.c b/tools/perf/arch/arm/util/auxtrace.c
index 0a6e75b8777a..18f0ea7556e7 100644
--- a/tools/perf/arch/arm/util/auxtrace.c
+++ b/tools/perf/arch/arm/util/auxtrace.c
@@ -10,11 +10,25 @@
 
 #include "../../util/auxtrace.h"
 #include "../../util/debug.h"
+#include "../../util/env.h"
 #include "../../util/evlist.h"
 #include "../../util/pmu.h"
 #include "cs-etm.h"
 #include "arm-spe.h"
 
+#define SPE_ATTR_TS_ENABLE		BIT(0)
+#define SPE_ATTR_PA_ENABLE		BIT(1)
+#define SPE_ATTR_PCT_ENABLE		BIT(2)
+#define SPE_ATTR_JITTER			BIT(16)
+#define SPE_ATTR_BRANCH_FILTER		BIT(32)
+#define SPE_ATTR_LOAD_FILTER		BIT(33)
+#define SPE_ATTR_STORE_FILTER		BIT(34)
+
+#define SPE_ATTR_EV_RETIRED		BIT(1)
+#define SPE_ATTR_EV_CACHE		BIT(3)
+#define SPE_ATTR_EV_TLB			BIT(5)
+#define SPE_ATTR_EV_BRANCH		BIT(7)
+
 static struct perf_pmu **find_all_arm_spe_pmus(int *nr_spes, int *err)
 {
 	struct perf_pmu **arm_spe_pmus = NULL;
@@ -108,3 +122,27 @@ struct auxtrace_record
 	*err = 0;
 	return NULL;
 }
+
+void auxtrace__preprocess_evlist(struct evlist *evlist)
+{
+	struct evsel *evsel;
+	struct perf_pmu *pmu;
+
+	evlist__for_each_entry(evlist, evsel) {
+		/* Currently only supports precise_ip for branch-misses on arm64 */
+		if (!strcmp(perf_env__arch(evlist->env), "arm64")
+			&& evsel->core.attr.config == PERF_COUNT_HW_BRANCH_MISSES
+			&& evsel->core.attr.precise_ip)
+		{
+			pmu = perf_pmu__find("arm_spe_0");
+			if (pmu) {
+				evsel->pmu_name = pmu->name;
+				evsel->core.attr.type = pmu->type;
+				evsel->core.attr.config = SPE_ATTR_TS_ENABLE
+							| SPE_ATTR_BRANCH_FILTER;
+				evsel->core.attr.config1 = SPE_ATTR_EV_BRANCH;
+				evsel->core.attr.precise_ip = 0;
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 4c301466101b..3bc61f03d572 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -2451,6 +2451,11 @@ int cmd_record(int argc, const char **argv)
 
 	argc = parse_options(argc, argv, record_options, record_usage,
 			    PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (auxtrace__preprocess_evlist) {
+		auxtrace__preprocess_evlist(rec->evlist);
+	}
+
 	if (quiet)
 		perf_quiet_option();
 
diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c
index 4ef22a0775a9..b21806c97dd8 100644
--- a/tools/perf/util/arm-spe.c
+++ b/tools/perf/util/arm-spe.c
@@ -778,6 +778,15 @@ arm_spe_synth_events(struct arm_spe *spe, struct perf_session *session)
 	attr.sample_id_all = evsel->core.attr.sample_id_all;
 	attr.read_format = evsel->core.attr.read_format;
 
+	/* If it is in the precise ip mode, there is no need to
+	 * synthesize new events. */
+	if (!strncmp(evsel->name, "branch-misses", 13)) {
+		spe->sample_branch_miss = true;
+		spe->branch_miss_id = evsel->core.id[0];
+
+		return 0;
+	}
+
 	/* create new id val to be a fixed offset from evsel id */
 	id = evsel->core.id[0] + 1000000000;
 
diff --git a/tools/perf/util/arm-spe.h b/tools/perf/util/arm-spe.h
index 98d3235781c3..8b1fb191d03a 100644
--- a/tools/perf/util/arm-spe.h
+++ b/tools/perf/util/arm-spe.h
@@ -20,6 +20,8 @@ enum {
 union perf_event;
 struct perf_session;
 struct perf_pmu;
+struct evlist;
+struct evsel;
 
 struct auxtrace_record *arm_spe_recording_init(int *err,
 					       struct perf_pmu *arm_spe_pmu);
@@ -28,4 +30,5 @@ int arm_spe_process_auxtrace_info(union perf_event *event,
 				  struct perf_session *session);
 
 struct perf_event_attr *arm_spe_pmu_default_config(struct perf_pmu *arm_spe_pmu);
+void arm_spe_precise_ip_support(struct evlist *evlist, struct evsel *evsel);
 #endif
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index 80617b0d044d..4f89a3a31ab2 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -584,6 +584,7 @@ void auxtrace__dump_auxtrace_sample(struct perf_session *session,
 int auxtrace__flush_events(struct perf_session *session, struct perf_tool *tool);
 void auxtrace__free_events(struct perf_session *session);
 void auxtrace__free(struct perf_session *session);
+void auxtrace__preprocess_evlist(struct evlist *evlist) __attribute__((weak));
 
 #define ITRACE_HELP \
 "				i:	    		synthesize instructions events\n"		\
@@ -728,6 +729,11 @@ void auxtrace__free(struct perf_session *session __maybe_unused)
 {
 }
 
+static inline
+void auxtrace__preprocess_evlist(struct evlist *evlist __maybe_unused)
+{
+}
+
 static inline
 int auxtrace_index__write(int fd __maybe_unused,
 			  struct list_head *head __maybe_unused)
-- 
2.17.1


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