From: Mathieu Poirier <mathieu.poir...@linaro.org>

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.poir...@linaro.org>
Acked-by: Jiri Olsa <jo...@kernel.org>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: linux-arm-ker...@lists.infradead.org
Link: 
http://lkml.kernel.org/r/1474041004-13956-6-git-send-email-mathieu.poir...@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
---
 tools/perf/util/Build         |  1 +
 tools/perf/util/drv_configs.c | 77 +++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/drv_configs.h | 26 +++++++++++++++
 tools/perf/util/pmu.h         |  2 ++
 4 files changed, 106 insertions(+)
 create mode 100644 tools/perf/util/drv_configs.c
 create mode 100644 tools/perf/util/drv_configs.h

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 96f99d608d00..eb60e613d795 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 000000000000..1647f285c629
--- /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/tools/perf/util/drv_configs.h b/tools/perf/util/drv_configs.h
new file mode 100644
index 000000000000..32bc9babc2e0
--- /dev/null
+++ b/tools/perf/util/drv_configs.h
@@ -0,0 +1,26 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef __PERF_DRV_CONFIGS_H
+#define __PERF_DRV_CONFIGS_H
+
+#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 5d7e84466bee..743422ad900b 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 {
-- 
2.7.4

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