[PATCH 07/14] tools/perf: Add basic CONFIG_AUXTRACE support for VPA pmu on powerpc

[Athira Rajeev <atrajeev@linux.ibm.com>]

The powerpc PMU collecting Dispatch Trace Log (DTL) entries makes use of
AUX support in perf infrastructure. The PMU driver has the functionality
to collect trace entries in the aux buffer. On the tools side, this data
is made available as PERF_RECORD_AUXTRACE records. This record is
generated by "perf record" command. To enable the creation of
PERF_RECORD_AUXTRACE, add functions to initialize auxtrace records ie
"auxtrace_record__init()". Fill in fields for other callbacks like
info_priv_size, info_fill, free, recording options etc. Define
auxtrace_type as PERF_AUXTRACE_VPA_PMU. Add header file to define vpa
dtl pmu specific details.

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
---
 tools/perf/arch/powerpc/util/Build      |   1 +
 tools/perf/arch/powerpc/util/auxtrace.c | 122 ++++++++++++++++++++++++
 tools/perf/util/auxtrace.c              |   2 +
 tools/perf/util/auxtrace.h              |   1 +
 tools/perf/util/powerpc-vpadtl.h        |  26 +++++
 5 files changed, 152 insertions(+)
 create mode 100644 tools/perf/arch/powerpc/util/auxtrace.c
 create mode 100644 tools/perf/util/powerpc-vpadtl.h

diff --git a/tools/perf/arch/powerpc/util/Build b/tools/perf/arch/powerpc/util/Build
index fdd6a77a3432..a5b0babd307e 100644
--- a/tools/perf/arch/powerpc/util/Build
+++ b/tools/perf/arch/powerpc/util/Build
@@ -10,3 +10,4 @@ perf-util-$(CONFIG_LIBDW) += skip-callchain-idx.o
 
 perf-util-$(CONFIG_LIBUNWIND) += unwind-libunwind.o
 perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
+perf-util-$(CONFIG_AUXTRACE) += auxtrace.o
diff --git a/tools/perf/arch/powerpc/util/auxtrace.c b/tools/perf/arch/powerpc/util/auxtrace.c
new file mode 100644
index 000000000000..ec8ec601fd08
--- /dev/null
+++ b/tools/perf/arch/powerpc/util/auxtrace.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VPA support
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/log2.h>
+#include <time.h>
+
+#include "../../util/cpumap.h"
+#include "../../util/evsel.h"
+#include "../../util/evlist.h"
+#include "../../util/session.h"
+#include "../../util/util.h"
+#include "../../util/pmu.h"
+#include "../../util/debug.h"
+#include "../../util/auxtrace.h"
+#include "../../util/powerpc-vpadtl.h"
+#include "../../util/record.h"
+#include <internal/lib.h> // page_size
+
+#define KiB(x) ((x) * 1024)
+
+static int
+powerpc_vpadtl_parse_snapshot_options(struct auxtrace_record *itr __maybe_unused,
+				struct record_opts *opts __maybe_unused,
+				const char *str __maybe_unused)
+{
+	return 0;
+}
+
+static int
+powerpc_vpadtl_recording_options(struct auxtrace_record *ar __maybe_unused,
+			struct evlist *evlist __maybe_unused,
+			struct record_opts *opts)
+{
+	opts->full_auxtrace = true;
+
+	/*
+	 * Set auxtrace_mmap_pages to minimum
+	 * two pages
+	 */
+	if (!opts->auxtrace_mmap_pages) {
+		opts->auxtrace_mmap_pages = KiB(128) / page_size;
+		if (opts->mmap_pages == UINT_MAX)
+			opts->mmap_pages = KiB(256) / page_size;
+	}
+
+	return 0;
+}
+
+static size_t powerpc_vpadtl_info_priv_size(struct auxtrace_record *itr __maybe_unused,
+					struct evlist *evlist __maybe_unused)
+{
+	return 0;
+}
+
+static int
+powerpc_vpadtl_info_fill(struct auxtrace_record *itr __maybe_unused,
+		struct perf_session *session __maybe_unused,
+		struct perf_record_auxtrace_info *auxtrace_info __maybe_unused,
+		size_t priv_size __maybe_unused)
+{
+	auxtrace_info->type = PERF_AUXTRACE_VPA_PMU;
+
+	return 0;
+}
+
+static u64 powerpc_vpadtl_reference(struct auxtrace_record *itr __maybe_unused)
+{
+	return 0;
+}
+
+static void powerpc_vpadtl_free(struct auxtrace_record *itr)
+{
+	free(itr);
+}
+
+struct auxtrace_record *auxtrace_record__init(struct evlist *evlist __maybe_unused,
+						int *err)
+{
+	struct auxtrace_record *aux;
+	struct evsel *pos;
+	char *pmu_name;
+	int found = 0;
+
+	evlist__for_each_entry(evlist, pos) {
+		pmu_name = strdup(pos->name);
+		pmu_name = strtok(pmu_name, "/");
+		if (!strcmp(pmu_name, "vpa_dtl")) {
+			found = 1;
+			pos->needs_auxtrace_mmap = true;
+			break;
+		}
+	}
+
+	if (!found)
+		return NULL;
+
+	/*
+	 * To obtain the auxtrace buffer file descriptor, the auxtrace event
+	 * must come first.
+	 */
+	evlist__to_front(pos->evlist, pos);
+
+	aux = zalloc(sizeof(*aux));
+	if (aux == NULL) {
+		pr_debug("aux record is NULL\n");
+		*err = -ENOMEM;
+		return NULL;
+	}
+
+	aux->parse_snapshot_options = powerpc_vpadtl_parse_snapshot_options;
+	aux->recording_options = powerpc_vpadtl_recording_options;
+	aux->info_priv_size = powerpc_vpadtl_info_priv_size;
+	aux->info_fill = powerpc_vpadtl_info_fill;
+	aux->free = powerpc_vpadtl_free;
+	aux->reference = powerpc_vpadtl_reference;
+	return aux;
+}
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index ebd32f1b8f12..f587d386c5ef 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -55,6 +55,7 @@
 #include "hisi-ptt.h"
 #include "s390-cpumsf.h"
 #include "util/mmap.h"
+#include "powerpc-vpadtl.h"
 
 #include <linux/ctype.h>
 #include "symbol/kallsyms.h"
@@ -1393,6 +1394,7 @@ int perf_event__process_auxtrace_info(struct perf_session *session,
 	case PERF_AUXTRACE_HISI_PTT:
 		err = hisi_ptt_process_auxtrace_info(event, session);
 		break;
+	case PERF_AUXTRACE_VPA_PMU:
 	case PERF_AUXTRACE_UNKNOWN:
 	default:
 		return -EINVAL;
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index f001cbb68f8e..1f9ef473af77 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -50,6 +50,7 @@ enum auxtrace_type {
 	PERF_AUXTRACE_ARM_SPE,
 	PERF_AUXTRACE_S390_CPUMSF,
 	PERF_AUXTRACE_HISI_PTT,
+	PERF_AUXTRACE_VPA_PMU,
 };
 
 enum itrace_period_type {
diff --git a/tools/perf/util/powerpc-vpadtl.h b/tools/perf/util/powerpc-vpadtl.h
new file mode 100644
index 000000000000..625172adaba5
--- /dev/null
+++ b/tools/perf/util/powerpc-vpadtl.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * VPA DTL PMU Support
+ */
+
+#ifndef INCLUDE__PERF_POWERPC_VPADTL_H__
+#define INCLUDE__PERF_POWERPC_VPADTL_H__
+
+#define POWERPC_VPADTL_NAME "powerpc_vpadtl_"
+
+enum {
+	POWERPC_VPADTL_TYPE,
+	VPADTL_PER_CPU_MMAPS,
+	VPADTL_AUXTRACE_PRIV_MAX,
+};
+
+#define VPADTL_AUXTRACE_PRIV_SIZE (VPADTL_AUXTRACE_PRIV_MAX * sizeof(u64))
+
+union perf_event;
+struct perf_session;
+struct perf_pmu;
+
+int powerpc_vpadtl_process_auxtrace_info(union perf_event *event,
+				  struct perf_session *session);
+
+#endif
-- 
2.47.1