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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Support for libpfm4 event encoding.
4  *
5  * Copyright 2020 Google LLC.
6  */
7 #include "util/cpumap.h"
8 #include "util/debug.h"
9 #include "util/event.h"
10 #include "util/evlist.h"
11 #include "util/evsel.h"
12 #include "util/parse-events.h"
13 #include "util/pmu.h"
14 #include "util/pfm.h"
15 #include "util/strbuf.h"
16
17 #include <string.h>
18 #include <linux/kernel.h>
19 #include <perfmon/pfmlib_perf_event.h>
20
21 static void libpfm_initialize(void)
22 {
23         int ret;
24
25         ret = pfm_initialize();
26         if (ret != PFM_SUCCESS) {
27                 ui__warning("libpfm failed to initialize: %s\n",
28                         pfm_strerror(ret));
29         }
30 }
31
32 int parse_libpfm_events_option(const struct option *opt, const char *str,
33                         int unset __maybe_unused)
34 {
35         struct evlist *evlist = *(struct evlist **)opt->value;
36         struct perf_event_attr attr;
37         struct perf_pmu *pmu;
38         struct evsel *evsel, *grp_leader = NULL;
39         char *p, *q, *p_orig;
40         const char *sep;
41         int grp_evt = -1;
42         int ret;
43
44         libpfm_initialize();
45
46         p_orig = p = strdup(str);
47         if (!p)
48                 return -1;
49         /*
50          * force loading of the PMU list
51          */
52         perf_pmu__scan(NULL);
53
54         for (q = p; strsep(&p, ",{}"); q = p) {
55                 sep = p ? str + (p - p_orig - 1) : "";
56                 if (*sep == '{') {
57                         if (grp_evt > -1) {
58                                 ui__error(
59                                         "nested event groups not supported\n");
60                                 goto error;
61                         }
62                         grp_evt++;
63                 }
64
65                 /* no event */
66                 if (*q == '\0') {
67                         if (*sep == '}') {
68                                 if (grp_evt < 0) {
69                                         ui__error("cannot close a non-existing event group\n");
70                                         goto error;
71                                 }
72                                 grp_evt--;
73                         }
74                         continue;
75                 }
76
77                 memset(&attr, 0, sizeof(attr));
78                 event_attr_init(&attr);
79
80                 ret = pfm_get_perf_event_encoding(q, PFM_PLM0|PFM_PLM3,
81                                                 &attr, NULL, NULL);
82
83                 if (ret != PFM_SUCCESS) {
84                         ui__error("failed to parse event %s : %s\n", str,
85                                   pfm_strerror(ret));
86                         goto error;
87                 }
88
89                 pmu = perf_pmu__find_by_type((unsigned int)attr.type);
90                 evsel = parse_events__add_event(evlist->core.nr_entries,
91                                                 &attr, q, /*metric_id=*/NULL,
92                                                 pmu);
93                 if (evsel == NULL)
94                         goto error;
95
96                 evsel->is_libpfm_event = true;
97
98                 evlist__add(evlist, evsel);
99
100                 if (grp_evt == 0)
101                         grp_leader = evsel;
102
103                 if (grp_evt > -1) {
104                         evsel__set_leader(evsel, grp_leader);
105                         grp_leader->core.nr_members++;
106                         grp_evt++;
107                 }
108
109                 if (*sep == '}') {
110                         if (grp_evt < 0) {
111                                 ui__error(
112                                    "cannot close a non-existing event group\n");
113                                 goto error;
114                         }
115                         evlist->core.nr_groups++;
116                         grp_leader = NULL;
117                         grp_evt = -1;
118                 }
119         }
120         free(p_orig);
121         return 0;
122 error:
123         free(p_orig);
124         return -1;
125 }
126
127 static const char *srcs[PFM_ATTR_CTRL_MAX] = {
128         [PFM_ATTR_CTRL_UNKNOWN] = "???",
129         [PFM_ATTR_CTRL_PMU] = "PMU",
130         [PFM_ATTR_CTRL_PERF_EVENT] = "perf_event",
131 };
132
133 static void
134 print_attr_flags(struct strbuf *buf, const pfm_event_attr_info_t *info)
135 {
136         if (info->is_dfl)
137                 strbuf_addf(buf, "[default] ");
138
139         if (info->is_precise)
140                 strbuf_addf(buf, "[precise] ");
141 }
142
143 static void
144 print_libpfm_event(const struct print_callbacks *print_cb, void *print_state,
145                 const pfm_pmu_info_t *pinfo, const pfm_event_info_t *info,
146                 struct strbuf *buf)
147 {
148         int j, ret;
149         char topic[80], name[80];
150
151         strbuf_setlen(buf, 0);
152         snprintf(topic, sizeof(topic), "pfm %s", pinfo->name);
153
154         snprintf(name, sizeof(name), "%s::%s", pinfo->name, info->name);
155         strbuf_addf(buf, "Code: 0x%"PRIx64"\n", info->code);
156
157         pfm_for_each_event_attr(j, info) {
158                 pfm_event_attr_info_t ainfo;
159                 const char *src;
160
161                 ainfo.size = sizeof(ainfo);
162                 ret = pfm_get_event_attr_info(info->idx, j, PFM_OS_PERF_EVENT_EXT, &ainfo);
163                 if (ret != PFM_SUCCESS)
164                         continue;
165
166                 if (ainfo.ctrl >= PFM_ATTR_CTRL_MAX)
167                         ainfo.ctrl = PFM_ATTR_CTRL_UNKNOWN;
168
169                 src = srcs[ainfo.ctrl];
170                 switch (ainfo.type) {
171                 case PFM_ATTR_UMASK: /* Ignore for now */
172                         break;
173                 case PFM_ATTR_MOD_BOOL:
174                         strbuf_addf(buf, " Modif: %s: [%s] : %s (boolean)\n", src,
175                                     ainfo.name, ainfo.desc);
176                         break;
177                 case PFM_ATTR_MOD_INTEGER:
178                         strbuf_addf(buf, " Modif: %s: [%s] : %s (integer)\n", src,
179                                     ainfo.name, ainfo.desc);
180                         break;
181                 case PFM_ATTR_NONE:
182                 case PFM_ATTR_RAW_UMASK:
183                 case PFM_ATTR_MAX:
184                 default:
185                         strbuf_addf(buf, " Attr: %s: [%s] : %s\n", src,
186                                     ainfo.name, ainfo.desc);
187                 }
188         }
189         print_cb->print_event(print_state,
190                         pinfo->name,
191                         topic,
192                         name, info->equiv,
193                         /*scale_unit=*/NULL,
194                         /*deprecated=*/NULL, "PFM event",
195                         info->desc, /*long_desc=*/NULL,
196                         /*encoding_desc=*/buf->buf,
197                         /*metric_name=*/NULL, /*metric_expr=*/NULL);
198
199         pfm_for_each_event_attr(j, info) {
200                 pfm_event_attr_info_t ainfo;
201                 const char *src;
202
203                 strbuf_setlen(buf, 0);
204
205                 ainfo.size = sizeof(ainfo);
206                 ret = pfm_get_event_attr_info(info->idx, j, PFM_OS_PERF_EVENT_EXT, &ainfo);
207                 if (ret != PFM_SUCCESS)
208                         continue;
209
210                 if (ainfo.ctrl >= PFM_ATTR_CTRL_MAX)
211                         ainfo.ctrl = PFM_ATTR_CTRL_UNKNOWN;
212
213                 src = srcs[ainfo.ctrl];
214                 if (ainfo.type == PFM_ATTR_UMASK) {
215                         strbuf_addf(buf, "Umask: 0x%02"PRIx64" : %s: ",
216                                 ainfo.code, src);
217                         print_attr_flags(buf, &ainfo);
218                         snprintf(name, sizeof(name), "%s::%s:%s",
219                                  pinfo->name, info->name, ainfo.name);
220                         print_cb->print_event(print_state,
221                                         pinfo->name,
222                                         topic,
223                                         name, /*alias=*/NULL,
224                                         /*scale_unit=*/NULL,
225                                         /*deprecated=*/NULL, "PFM event",
226                                         ainfo.desc, /*long_desc=*/NULL,
227                                         /*encoding_desc=*/buf->buf,
228                                         /*metric_name=*/NULL, /*metric_expr=*/NULL);
229                 }
230         }
231 }
232
233 void print_libpfm_events(const struct print_callbacks *print_cb, void *print_state)
234 {
235         pfm_event_info_t info;
236         pfm_pmu_info_t pinfo;
237         int p, ret;
238         struct strbuf storage;
239
240         libpfm_initialize();
241
242         /* initialize to zero to indicate ABI version */
243         info.size  = sizeof(info);
244         pinfo.size = sizeof(pinfo);
245
246         strbuf_init(&storage, 2048);
247
248         pfm_for_all_pmus(p) {
249                 ret = pfm_get_pmu_info(p, &pinfo);
250                 if (ret != PFM_SUCCESS)
251                         continue;
252
253                 /* only print events that are supported by host HW */
254                 if (!pinfo.is_present)
255                         continue;
256
257                 /* handled by perf directly */
258                 if (pinfo.pmu == PFM_PMU_PERF_EVENT)
259                         continue;
260
261                 for (int i = pinfo.first_event; i != -1; i = pfm_get_event_next(i)) {
262                         ret = pfm_get_event_info(i, PFM_OS_PERF_EVENT_EXT,
263                                                 &info);
264                         if (ret != PFM_SUCCESS)
265                                 continue;
266
267                         print_libpfm_event(print_cb, print_state, &pinfo, &info, &storage);
268                 }
269         }
270         strbuf_release(&storage);
271 }
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