1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * dlfilter-test-api-v0.c: test original (v0) API for perf --dlfilter shared object
4 * Copyright (c) 2021, Intel Corporation.
5 */
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <string.h>
9 #include <stdbool.h>
10
11 /*
12 * Copy original (v0) API instead of including current API
13 */
14 #include <linux/perf_event.h>
15 #include <linux/types.h>
16
17 /* Definitions for perf_dlfilter_sample flags */
18 enum {
19 PERF_DLFILTER_FLAG_BRANCH = 1ULL << 0,
20 PERF_DLFILTER_FLAG_CALL = 1ULL << 1,
21 PERF_DLFILTER_FLAG_RETURN = 1ULL << 2,
22 PERF_DLFILTER_FLAG_CONDITIONAL = 1ULL << 3,
23 PERF_DLFILTER_FLAG_SYSCALLRET = 1ULL << 4,
24 PERF_DLFILTER_FLAG_ASYNC = 1ULL << 5,
25 PERF_DLFILTER_FLAG_INTERRUPT = 1ULL << 6,
26 PERF_DLFILTER_FLAG_TX_ABORT = 1ULL << 7,
27 PERF_DLFILTER_FLAG_TRACE_BEGIN = 1ULL << 8,
28 PERF_DLFILTER_FLAG_TRACE_END = 1ULL << 9,
29 PERF_DLFILTER_FLAG_IN_TX = 1ULL << 10,
30 PERF_DLFILTER_FLAG_VMENTRY = 1ULL << 11,
31 PERF_DLFILTER_FLAG_VMEXIT = 1ULL << 12,
32 };
33
34 /*
35 * perf sample event information (as per perf script and <linux/perf_event.h>)
36 */
37 struct perf_dlfilter_sample {
38 __u32 size; /* Size of this structure (for compatibility checking) */
39 __u16 ins_lat; /* Refer PERF_SAMPLE_WEIGHT_TYPE in <linux/perf_event.h> */
40 __u16 p_stage_cyc; /* Refer PERF_SAMPLE_WEIGHT_TYPE in <linux/perf_event.h> */
41 __u64 ip;
42 __s32 pid;
43 __s32 tid;
44 __u64 time;
45 __u64 addr;
46 __u64 id;
47 __u64 stream_id;
48 __u64 period;
49 __u64 weight; /* Refer PERF_SAMPLE_WEIGHT_TYPE in <linux/perf_event.h> */
50 __u64 transaction; /* Refer PERF_SAMPLE_TRANSACTION in <linux/perf_event.h> */
51 __u64 insn_cnt; /* For instructions-per-cycle (IPC) */
52 __u64 cyc_cnt; /* For instructions-per-cycle (IPC) */
53 __s32 cpu;
54 __u32 flags; /* Refer PERF_DLFILTER_FLAG_* above */
55 __u64 data_src; /* Refer PERF_SAMPLE_DATA_SRC in <linux/perf_event.h> */
56 __u64 phys_addr; /* Refer PERF_SAMPLE_PHYS_ADDR in <linux/perf_event.h> */
57 __u64 data_page_size; /* Refer PERF_SAMPLE_DATA_PAGE_SIZE in <linux/perf_event.h> */
58 __u64 code_page_size; /* Refer PERF_SAMPLE_CODE_PAGE_SIZE in <linux/perf_event.h> */
59 __u64 cgroup; /* Refer PERF_SAMPLE_CGROUP in <linux/perf_event.h> */
60 __u8 cpumode; /* Refer CPUMODE_MASK etc in <linux/perf_event.h> */
61 __u8 addr_correlates_sym; /* True => resolve_addr() can be called */
62 __u16 misc; /* Refer perf_event_header in <linux/perf_event.h> */
63 __u32 raw_size; /* Refer PERF_SAMPLE_RAW in <linux/perf_event.h> */
64 const void *raw_data; /* Refer PERF_SAMPLE_RAW in <linux/perf_event.h> */
65 __u64 brstack_nr; /* Number of brstack entries */
66 const struct perf_branch_entry *brstack; /* Refer <linux/perf_event.h> */
67 __u64 raw_callchain_nr; /* Number of raw_callchain entries */
68 const __u64 *raw_callchain; /* Refer <linux/perf_event.h> */
69 const char *event;
70 };
71
72 /*
73 * Address location (as per perf script)
74 */
75 struct perf_dlfilter_al {
76 __u32 size; /* Size of this structure (for compatibility checking) */
77 __u32 symoff;
78 const char *sym;
79 __u64 addr; /* Mapped address (from dso) */
80 __u64 sym_start;
81 __u64 sym_end;
82 const char *dso;
83 __u8 sym_binding; /* STB_LOCAL, STB_GLOBAL or STB_WEAK, refer <elf.h> */
84 __u8 is_64_bit; /* Only valid if dso is not NULL */
85 __u8 is_kernel_ip; /* True if in kernel space */
86 __u32 buildid_size;
87 __u8 *buildid;
88 /* Below members are only populated by resolve_ip() */
89 __u8 filtered; /* True if this sample event will be filtered out */
90 const char *comm;
91 };
92
93 struct perf_dlfilter_fns {
94 /* Return information about ip */
95 const struct perf_dlfilter_al *(*resolve_ip)(void *ctx);
96 /* Return information about addr (if addr_correlates_sym) */
97 const struct perf_dlfilter_al *(*resolve_addr)(void *ctx);
98 /* Return arguments from --dlarg option */
99 char **(*args)(void *ctx, int *dlargc);
100 /*
101 * Return information about address (al->size must be set before
102 * calling). Returns 0 on success, -1 otherwise.
103 */
104 __s32 (*resolve_address)(void *ctx, __u64 address, struct perf_dlfilter_al *al);
105 /* Return instruction bytes and length */
106 const __u8 *(*insn)(void *ctx, __u32 *length);
107 /* Return source file name and line number */
108 const char *(*srcline)(void *ctx, __u32 *line_number);
109 /* Return perf_event_attr, refer <linux/perf_event.h> */
110 struct perf_event_attr *(*attr)(void *ctx);
111 /* Read object code, return numbers of bytes read */
112 __s32 (*object_code)(void *ctx, __u64 ip, void *buf, __u32 len);
113 /* Reserved */
114 void *(*reserved[120])(void *);
115 };
116
117 struct perf_dlfilter_fns perf_dlfilter_fns;
118
119 static int verbose;
120
121 #define pr_debug(fmt, ...) do { \
122 if (verbose) \
123 fprintf(stderr, fmt, ##__VA_ARGS__); \
124 } while (0)
125
test_fail(const char * msg)126 static int test_fail(const char *msg)
127 {
128 pr_debug("%s\n", msg);
129 return -1;
130 }
131
132 #define CHECK(x) do { \
133 if (!(x)) \
134 return test_fail("Check '" #x "' failed\n"); \
135 } while (0)
136
137 struct filter_data {
138 __u64 ip;
139 __u64 addr;
140 int do_early;
141 int early_filter_cnt;
142 int filter_cnt;
143 };
144
145 static struct filter_data *filt_dat;
146
start(void ** data,void * ctx)147 int start(void **data, void *ctx)
148 {
149 int dlargc;
150 char **dlargv;
151 struct filter_data *d;
152 static bool called;
153
154 verbose = 1;
155
156 CHECK(!filt_dat && !called);
157 called = true;
158
159 d = calloc(1, sizeof(*d));
160 if (!d)
161 test_fail("Failed to allocate memory");
162 filt_dat = d;
163 *data = d;
164
165 dlargv = perf_dlfilter_fns.args(ctx, &dlargc);
166
167 CHECK(dlargc == 6);
168 CHECK(!strcmp(dlargv[0], "first"));
169 verbose = strtol(dlargv[1], NULL, 0);
170 d->ip = strtoull(dlargv[2], NULL, 0);
171 d->addr = strtoull(dlargv[3], NULL, 0);
172 d->do_early = strtol(dlargv[4], NULL, 0);
173 CHECK(!strcmp(dlargv[5], "last"));
174
175 pr_debug("%s API\n", __func__);
176
177 return 0;
178 }
179
180 #define CHECK_SAMPLE(x) do { \
181 if (sample->x != expected.x) \
182 return test_fail("'" #x "' not expected value\n"); \
183 } while (0)
184
check_sample(struct filter_data * d,const struct perf_dlfilter_sample * sample)185 static int check_sample(struct filter_data *d, const struct perf_dlfilter_sample *sample)
186 {
187 struct perf_dlfilter_sample expected = {
188 .ip = d->ip,
189 .pid = 12345,
190 .tid = 12346,
191 .time = 1234567890,
192 .addr = d->addr,
193 .id = 99,
194 .stream_id = 101,
195 .period = 543212345,
196 .cpu = 31,
197 .cpumode = PERF_RECORD_MISC_USER,
198 .addr_correlates_sym = 1,
199 .misc = PERF_RECORD_MISC_USER,
200 };
201
202 CHECK(sample->size >= sizeof(struct perf_dlfilter_sample));
203
204 CHECK_SAMPLE(ip);
205 CHECK_SAMPLE(pid);
206 CHECK_SAMPLE(tid);
207 CHECK_SAMPLE(time);
208 CHECK_SAMPLE(addr);
209 CHECK_SAMPLE(id);
210 CHECK_SAMPLE(stream_id);
211 CHECK_SAMPLE(period);
212 CHECK_SAMPLE(cpu);
213 CHECK_SAMPLE(cpumode);
214 CHECK_SAMPLE(addr_correlates_sym);
215 CHECK_SAMPLE(misc);
216
217 CHECK(!sample->raw_data);
218 CHECK_SAMPLE(brstack_nr);
219 CHECK(!sample->brstack);
220 CHECK_SAMPLE(raw_callchain_nr);
221 CHECK(!sample->raw_callchain);
222
223 #define EVENT_NAME "branches:"
224 CHECK(!strncmp(sample->event, EVENT_NAME, strlen(EVENT_NAME)));
225
226 return 0;
227 }
228
check_al(void * ctx)229 static int check_al(void *ctx)
230 {
231 const struct perf_dlfilter_al *al;
232
233 al = perf_dlfilter_fns.resolve_ip(ctx);
234 if (!al)
235 return test_fail("resolve_ip() failed");
236
237 CHECK(al->sym && !strcmp("foo", al->sym));
238 CHECK(!al->symoff);
239
240 return 0;
241 }
242
check_addr_al(void * ctx)243 static int check_addr_al(void *ctx)
244 {
245 const struct perf_dlfilter_al *addr_al;
246
247 addr_al = perf_dlfilter_fns.resolve_addr(ctx);
248 if (!addr_al)
249 return test_fail("resolve_addr() failed");
250
251 CHECK(addr_al->sym && !strcmp("bar", addr_al->sym));
252 CHECK(!addr_al->symoff);
253
254 return 0;
255 }
256
check_attr(void * ctx)257 static int check_attr(void *ctx)
258 {
259 struct perf_event_attr *attr = perf_dlfilter_fns.attr(ctx);
260
261 CHECK(attr);
262 CHECK(attr->type == PERF_TYPE_HARDWARE);
263 CHECK(attr->config == PERF_COUNT_HW_BRANCH_INSTRUCTIONS);
264
265 return 0;
266 }
267
do_checks(void * data,const struct perf_dlfilter_sample * sample,void * ctx,bool early)268 static int do_checks(void *data, const struct perf_dlfilter_sample *sample, void *ctx, bool early)
269 {
270 struct filter_data *d = data;
271
272 CHECK(data && filt_dat == data);
273
274 if (early) {
275 CHECK(!d->early_filter_cnt);
276 d->early_filter_cnt += 1;
277 } else {
278 CHECK(!d->filter_cnt);
279 CHECK(d->early_filter_cnt);
280 CHECK(d->do_early != 2);
281 d->filter_cnt += 1;
282 }
283
284 if (check_sample(data, sample))
285 return -1;
286
287 if (check_attr(ctx))
288 return -1;
289
290 if (early && !d->do_early)
291 return 0;
292
293 if (check_al(ctx) || check_addr_al(ctx))
294 return -1;
295
296 if (early)
297 return d->do_early == 2;
298
299 return 1;
300 }
301
filter_event_early(void * data,const struct perf_dlfilter_sample * sample,void * ctx)302 int filter_event_early(void *data, const struct perf_dlfilter_sample *sample, void *ctx)
303 {
304 pr_debug("%s API\n", __func__);
305
306 return do_checks(data, sample, ctx, true);
307 }
308
filter_event(void * data,const struct perf_dlfilter_sample * sample,void * ctx)309 int filter_event(void *data, const struct perf_dlfilter_sample *sample, void *ctx)
310 {
311 pr_debug("%s API\n", __func__);
312
313 return do_checks(data, sample, ctx, false);
314 }
315
stop(void * data,void * ctx)316 int stop(void *data, void *ctx)
317 {
318 static bool called;
319
320 pr_debug("%s API\n", __func__);
321
322 CHECK(data && filt_dat == data && !called);
323 called = true;
324
325 free(data);
326 filt_dat = NULL;
327 return 0;
328 }
329
filter_description(const char ** long_description)330 const char *filter_description(const char **long_description)
331 {
332 *long_description = "Filter used by the 'dlfilter C API' perf test";
333 return "dlfilter to test v0 C API";
334 }
335