1/*
 2 * drv_configs.h: Interface to apply PMU specific configuration
 3 * Copyright (c) 2016-2018, Linaro Ltd.
 4 *
 5 * This program is free software; you can redistribute it and/or modify it
 6 * under the terms and conditions of the GNU General Public License,
 7 * version 2, as published by the Free Software Foundation.
 8 *
 9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12 * more details.
13 *
14 */
15
16#include "drv_configs.h"
17#include "evlist.h"
18#include "evsel.h"
19#include "pmu.h"
20#include <errno.h>
21
22static int
23perf_evsel__apply_drv_configs(struct perf_evsel *evsel,
24			      struct perf_evsel_config_term **err_term)
25{
26	bool found = false;
27	int err = 0;
28	struct perf_evsel_config_term *term;
29	struct perf_pmu *pmu = NULL;
30
31	while ((pmu = perf_pmu__scan(pmu)) != NULL)
32		if (pmu->type == evsel->attr.type) {
33			found = true;
34			break;
35		}
36
37	list_for_each_entry(term, &evsel->config_terms, list) {
38		if (term->type != PERF_EVSEL__CONFIG_TERM_DRV_CFG)
39			continue;
40
41		/*
42		 * We have a configuration term, report an error if we
43		 * can't find the PMU or if the PMU driver doesn't support
44		 * cmd line driver configuration.
45		 */
46		if (!found || !pmu->set_drv_config) {
47			err = -EINVAL;
48			*err_term = term;
49			break;
50		}
51
52		err = pmu->set_drv_config(term);
53		if (err) {
54			*err_term = term;
55			break;
56		}
57	}
58
59	return err;
60}
61
62int perf_evlist__apply_drv_configs(struct perf_evlist *evlist,
63				   struct perf_evsel **err_evsel,
64				   struct perf_evsel_config_term **err_term)
65{
66	struct perf_evsel *evsel;
67	int err = 0;
68
69	evlist__for_each_entry(evlist, evsel) {
70		err = perf_evsel__apply_drv_configs(evsel, err_term);
71		if (err) {
72			*err_evsel = evsel;
73			break;
74		}
75	}
76
77	return err;
78}