1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright IBM Corp. 2019
4  * Author(s): Thomas Richter <tmricht@linux.ibm.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License (version 2 only)
8  * as published by the Free Software Foundation.
9  *
10  * Architecture specific trace_event function. Save event's bc000 raw data
11  * to file. File name is aux.ctr.## where ## stands for the CPU number the
12  * sample was taken from.
13  */
14 
15 #include <unistd.h>
16 #include <stdio.h>
17 #include <string.h>
18 #include <inttypes.h>
19 
20 #include <sys/stat.h>
21 #include <linux/compiler.h>
22 #include <asm/byteorder.h>
23 
24 #include "debug.h"
25 #include "session.h"
26 #include "evlist.h"
27 #include "color.h"
28 #include "sample-raw.h"
29 #include "s390-cpumcf-kernel.h"
30 #include "pmu-events/pmu-events.h"
31 
32 static size_t ctrset_size(struct cf_ctrset_entry *set)
33 {
34 	return sizeof(*set) + set->ctr * sizeof(u64);
35 }
36 
37 static bool ctrset_valid(struct cf_ctrset_entry *set)
38 {
39 	return set->def == S390_CPUMCF_DIAG_DEF;
40 }
41 
42 /* CPU Measurement Counter Facility raw data is a byte stream. It is 8 byte
43  * aligned and might have trailing padding bytes.
44  * Display the raw data on screen.
45  */
46 static bool s390_cpumcfdg_testctr(struct perf_sample *sample)
47 {
48 	size_t len = sample->raw_size, offset = 0;
49 	unsigned char *buf = sample->raw_data;
50 	struct cf_trailer_entry *te;
51 	struct cf_ctrset_entry *cep, ce;
52 
53 	if (!len)
54 		return false;
55 	while (offset < len) {
56 		cep = (struct cf_ctrset_entry *)(buf + offset);
57 		ce.def = be16_to_cpu(cep->def);
58 		ce.set = be16_to_cpu(cep->set);
59 		ce.ctr = be16_to_cpu(cep->ctr);
60 		ce.res1 = be16_to_cpu(cep->res1);
61 
62 		if (!ctrset_valid(&ce) || offset + ctrset_size(&ce) > len) {
63 			/* Raw data for counter sets are always multiple of 8
64 			 * bytes. Prepending a 4 bytes size field to the
65 			 * raw data block in the sample causes the perf tool
66 			 * to append 4 padding bytes to make the raw data part
67 			 * of the sample a multiple of eight bytes again.
68 			 *
69 			 * If the last entry (trailer) is 4 bytes off the raw
70 			 * area data end, all is good.
71 			 */
72 			if (len - offset - sizeof(*te) == 4)
73 				break;
74 			pr_err("Invalid counter set entry at %zd\n", offset);
75 			return false;
76 		}
77 		offset += ctrset_size(&ce);
78 	}
79 	return true;
80 }
81 
82 /* Dump event bc000 on screen, already tested on correctness. */
83 static void s390_cpumcfdg_dumptrail(const char *color, size_t offset,
84 				    struct cf_trailer_entry *tep)
85 {
86 	struct cf_trailer_entry  te;
87 
88 	te.flags = be64_to_cpu(tep->flags);
89 	te.cfvn = be16_to_cpu(tep->cfvn);
90 	te.csvn = be16_to_cpu(tep->csvn);
91 	te.cpu_speed = be32_to_cpu(tep->cpu_speed);
92 	te.timestamp = be64_to_cpu(tep->timestamp);
93 	te.progusage1 = be64_to_cpu(tep->progusage1);
94 	te.progusage2 = be64_to_cpu(tep->progusage2);
95 	te.progusage3 = be64_to_cpu(tep->progusage3);
96 	te.tod_base = be64_to_cpu(tep->tod_base);
97 	te.mach_type = be16_to_cpu(tep->mach_type);
98 	te.res1 = be16_to_cpu(tep->res1);
99 	te.res2 = be32_to_cpu(tep->res2);
100 
101 	color_fprintf(stdout, color, "    [%#08zx] Trailer:%c%c%c%c%c"
102 		      " Cfvn:%d Csvn:%d Speed:%d TOD:%#llx\n",
103 		      offset, te.clock_base ? 'T' : ' ',
104 		      te.speed ? 'S' : ' ', te.mtda ? 'M' : ' ',
105 		      te.caca ? 'C' : ' ', te.lcda ? 'L' : ' ',
106 		      te.cfvn, te.csvn, te.cpu_speed, te.timestamp);
107 	color_fprintf(stdout, color, "\t\t1:%lx 2:%lx 3:%lx TOD-Base:%#llx"
108 		      " Type:%x\n\n",
109 		      te.progusage1, te.progusage2, te.progusage3,
110 		      te.tod_base, te.mach_type);
111 }
112 
113 /* Return starting number of a counter set */
114 static int get_counterset_start(int setnr)
115 {
116 	switch (setnr) {
117 	case CPUMF_CTR_SET_BASIC:		/* Basic counter set */
118 		return 0;
119 	case CPUMF_CTR_SET_USER:		/* Problem state counter set */
120 		return 32;
121 	case CPUMF_CTR_SET_CRYPTO:		/* Crypto counter set */
122 		return 64;
123 	case CPUMF_CTR_SET_EXT:			/* Extended counter set */
124 		return 128;
125 	case CPUMF_CTR_SET_MT_DIAG:		/* Diagnostic counter set */
126 		return 448;
127 	default:
128 		return -1;
129 	}
130 }
131 
132 /* Scan the PMU table and extract the logical name of a counter from the
133  * PMU events table. Input is the counter set and counter number with in the
134  * set. Construct the event number and use this as key. If they match return
135  * the name of this counter.
136  * If no match is found a NULL pointer is returned.
137  */
138 static const char *get_counter_name(int set, int nr, struct pmu_events_map *map)
139 {
140 	int rc, event_nr, wanted = get_counterset_start(set) + nr;
141 
142 	if (map) {
143 		struct pmu_event *evp = map->table;
144 
145 		for (; evp->name || evp->event || evp->desc; ++evp) {
146 			if (evp->name == NULL || evp->event == NULL)
147 				continue;
148 			rc = sscanf(evp->event, "event=%x", &event_nr);
149 			if (rc == 1 && event_nr == wanted)
150 				return evp->name;
151 		}
152 	}
153 	return NULL;
154 }
155 
156 static void s390_cpumcfdg_dump(struct perf_sample *sample)
157 {
158 	size_t i, len = sample->raw_size, offset = 0;
159 	unsigned char *buf = sample->raw_data;
160 	const char *color = PERF_COLOR_BLUE;
161 	struct cf_ctrset_entry *cep, ce;
162 	struct pmu_events_map *map;
163 	u64 *p;
164 
165 	map = pmu_events_map__find();
166 	while (offset < len) {
167 		cep = (struct cf_ctrset_entry *)(buf + offset);
168 
169 		ce.def = be16_to_cpu(cep->def);
170 		ce.set = be16_to_cpu(cep->set);
171 		ce.ctr = be16_to_cpu(cep->ctr);
172 		ce.res1 = be16_to_cpu(cep->res1);
173 
174 		if (!ctrset_valid(&ce)) {	/* Print trailer */
175 			s390_cpumcfdg_dumptrail(color, offset,
176 						(struct cf_trailer_entry *)cep);
177 			return;
178 		}
179 
180 		color_fprintf(stdout, color, "    [%#08zx] Counterset:%d"
181 			      " Counters:%d\n", offset, ce.set, ce.ctr);
182 		for (i = 0, p = (u64 *)(cep + 1); i < ce.ctr; ++i, ++p) {
183 			const char *ev_name = get_counter_name(ce.set, i, map);
184 
185 			color_fprintf(stdout, color,
186 				      "\tCounter:%03d %s Value:%#018lx\n", i,
187 				      ev_name ?: "<unknown>", be64_to_cpu(*p));
188 		}
189 		offset += ctrset_size(&ce);
190 	}
191 }
192 
193 /* S390 specific trace event function. Check for PERF_RECORD_SAMPLE events
194  * and if the event was triggered by a counter set diagnostic event display
195  * its raw data.
196  * The function is only invoked when the dump flag -D is set.
197  */
198 void evlist__s390_sample_raw(struct evlist *evlist, union perf_event *event, struct perf_sample *sample)
199 {
200 	struct evsel *ev_bc000;
201 
202 	if (event->header.type != PERF_RECORD_SAMPLE)
203 		return;
204 
205 	ev_bc000 = evlist__event2evsel(evlist, event);
206 	if (ev_bc000 == NULL ||
207 	    ev_bc000->core.attr.config != PERF_EVENT_CPUM_CF_DIAG)
208 		return;
209 
210 	/* Display raw data on screen */
211 	if (!s390_cpumcfdg_testctr(sample)) {
212 		pr_err("Invalid counter set data encountered\n");
213 		return;
214 	}
215 	s390_cpumcfdg_dump(sample);
216 }
217