[tip:perf/core] perf pmu: Push configuration down to PMU driver

[tip-bot for Mathieu Poirier <tipbot@zytor.com>]

Commit-ID:  859442bd3fcbe326a9c0174c6105c938eb101438
Gitweb:     http://git.kernel.org/tip/859442bd3fcbe326a9c0174c6105c938eb101438
Author:     Mathieu Poirier <mathieu.poirier@linaro.org>
AuthorDate: Fri, 16 Sep 2016 09:50:02 -0600
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 22 Sep 2016 12:19:41 -0300

perf pmu: Push configuration down to PMU driver

This patch adds a PMU callback and the required mechanic so that drivers
can process the command line configuration elements found in
evsel::config_terms.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1474041004-13956-6-git-send-email-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/Build                              |  1 +
 tools/perf/util/drv_configs.c                      | 77 ++++++++++++++++++++++
 .../plat/smp.h => tools/perf/util/drv_configs.h    | 20 +++---
 tools/perf/util/pmu.h                              |  2 +
 4 files changed, 90 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 96f99d6..eb60e61 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -86,6 +86,7 @@ libperf-y += term.o
 libperf-y += help-unknown-cmd.o
 libperf-y += mem-events.o
 libperf-y += vsprintf.o
+libperf-y += drv_configs.o
 
 libperf-$(CONFIG_LIBBPF) += bpf-loader.o
 libperf-$(CONFIG_BPF_PROLOGUE) += bpf-prologue.o
diff --git a/tools/perf/util/drv_configs.c b/tools/perf/util/drv_configs.c
new file mode 100644
index 0000000..1647f28
--- /dev/null
+++ b/tools/perf/util/drv_configs.c
@@ -0,0 +1,77 @@
+/*
+ * drv_configs.h: Interface to apply PMU specific configuration
+ * Copyright (c) 2016-2018, Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include "drv_configs.h"
+#include "evlist.h"
+#include "evsel.h"
+#include "pmu.h"
+
+static int
+perf_evsel__apply_drv_configs(struct perf_evsel *evsel,
+			      struct perf_evsel_config_term **err_term)
+{
+	bool found = false;
+	int err = 0;
+	struct perf_evsel_config_term *term;
+	struct perf_pmu *pmu = NULL;
+
+	while ((pmu = perf_pmu__scan(pmu)) != NULL)
+		if (pmu->type == evsel->attr.type) {
+			found = true;
+			break;
+		}
+
+	list_for_each_entry(term, &evsel->config_terms, list) {
+		if (term->type != PERF_EVSEL__CONFIG_TERM_DRV_CFG)
+			continue;
+
+		/*
+		 * We have a configuration term, report an error if we
+		 * can't find the PMU or if the PMU driver doesn't support
+		 * cmd line driver configuration.
+		 */
+		if (!found || !pmu->set_drv_config) {
+			err = -EINVAL;
+			*err_term = term;
+			break;
+		}
+
+		err = pmu->set_drv_config(term);
+		if (err) {
+			*err_term = term;
+			break;
+		}
+	}
+
+	return err;
+}
+
+int perf_evlist__apply_drv_configs(struct perf_evlist *evlist,
+				   struct perf_evsel **err_evsel,
+				   struct perf_evsel_config_term **err_term)
+{
+	struct perf_evsel *evsel;
+	int err = 0;
+
+	evlist__for_each_entry(evlist, evsel) {
+		err = perf_evsel__apply_drv_configs(evsel, err_term);
+		if (err) {
+			*err_evsel = evsel;
+			break;
+		}
+	}
+
+	return err;
+}
diff --git a/arch/arc/plat-eznps/include/plat/smp.h b/tools/perf/util/drv_configs.h
similarity index 55%
copy from arch/arc/plat-eznps/include/plat/smp.h
copy to tools/perf/util/drv_configs.h
index 06b59bd..32bc9ba 100644
--- a/arch/arc/plat-eznps/include/plat/smp.h
+++ b/tools/perf/util/drv_configs.h
@@ -1,5 +1,6 @@
 /*
- * Copyright(c) 2015 EZchip Technologies.
+ * drv_configs.h: Interface to apply PMU specific configuration
+ * Copyright (c) 2016-2018, Linaro Ltd.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -10,17 +11,16 @@
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
- * The full GNU General Public License is included in this distribution in
- * the file called "COPYING".
  */
 
-#ifndef __PLAT_EZNPS_SMP_H
-#define __PLAT_EZNPS_SMP_H
+#ifndef __PERF_DRV_CONFIGS_H
+#define __PERF_DRV_CONFIGS_H
 
-#ifdef CONFIG_SMP
-
-extern void res_service(void);
-
-#endif /* CONFIG_SMP */
+#include "drv_configs.h"
+#include "evlist.h"
+#include "evsel.h"
 
+int perf_evlist__apply_drv_configs(struct perf_evlist *evlist,
+				   struct perf_evsel **err_evsel,
+				   struct perf_evsel_config_term **term);
 #endif
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 5d7e844..743422a 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -4,6 +4,7 @@
 #include <linux/bitmap.h>
 #include <linux/perf_event.h>
 #include <stdbool.h>
+#include "evsel.h"
 #include "parse-events.h"
 
 enum {
@@ -25,6 +26,7 @@ struct perf_pmu {
 	struct list_head format;  /* HEAD struct perf_pmu_format -> list */
 	struct list_head aliases; /* HEAD struct perf_pmu_alias -> list */
 	struct list_head list;    /* ELEM */
+	int (*set_drv_config)	(struct perf_evsel_config_term *term);
 };
 
 struct perf_pmu_info {