Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include "data.h"
3#include "debug.h"
4#include "header.h"
5#include "session.h"
6#include "stat.h"
7#include "tool.h"
8#include "tsc.h"
9#include <sys/mman.h>
10#include <unistd.h>
11
12#ifdef HAVE_ZSTD_SUPPORT
13static int perf_session__process_compressed_event(struct perf_session *session,
14 union perf_event *event, u64 file_offset,
15 const char *file_path)
16{
17 void *src;
18 size_t decomp_size, src_size;
19 u64 decomp_last_rem = 0;
20 size_t mmap_len, decomp_len = session->header.env.comp_mmap_len;
21 struct decomp *decomp, *decomp_last = session->active_decomp->decomp_last;
22
23 if (decomp_last) {
24 decomp_last_rem = decomp_last->size - decomp_last->head;
25 decomp_len += decomp_last_rem;
26 }
27
28 mmap_len = sizeof(struct decomp) + decomp_len;
29 decomp = mmap(NULL, mmap_len, PROT_READ|PROT_WRITE,
30 MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
31 if (decomp == MAP_FAILED) {
32 pr_err("Couldn't allocate memory for decompression\n");
33 return -1;
34 }
35
36 decomp->file_pos = file_offset;
37 decomp->file_path = file_path;
38 decomp->mmap_len = mmap_len;
39 decomp->head = 0;
40
41 if (decomp_last_rem) {
42 memcpy(decomp->data, &(decomp_last->data[decomp_last->head]), decomp_last_rem);
43 decomp->size = decomp_last_rem;
44 }
45
46 src = (void *)event + sizeof(struct perf_record_compressed);
47 src_size = event->pack.header.size - sizeof(struct perf_record_compressed);
48
49 decomp_size = zstd_decompress_stream(session->active_decomp->zstd_decomp, src, src_size,
50 &(decomp->data[decomp_last_rem]), decomp_len - decomp_last_rem);
51 if (!decomp_size) {
52 munmap(decomp, mmap_len);
53 pr_err("Couldn't decompress data\n");
54 return -1;
55 }
56
57 decomp->size += decomp_size;
58
59 if (session->active_decomp->decomp == NULL)
60 session->active_decomp->decomp = decomp;
61 else
62 session->active_decomp->decomp_last->next = decomp;
63
64 session->active_decomp->decomp_last = decomp;
65
66 pr_debug("decomp (B): %zd to %zd\n", src_size, decomp_size);
67
68 return 0;
69}
70#endif
71
72static int process_event_synth_tracing_data_stub(struct perf_session *session
73 __maybe_unused,
74 union perf_event *event
75 __maybe_unused)
76{
77 dump_printf(": unhandled!\n");
78 return 0;
79}
80
81static int process_event_synth_attr_stub(const struct perf_tool *tool __maybe_unused,
82 union perf_event *event __maybe_unused,
83 struct evlist **pevlist
84 __maybe_unused)
85{
86 dump_printf(": unhandled!\n");
87 return 0;
88}
89
90static int process_event_synth_event_update_stub(const struct perf_tool *tool __maybe_unused,
91 union perf_event *event __maybe_unused,
92 struct evlist **pevlist
93 __maybe_unused)
94{
95 if (dump_trace)
96 perf_event__fprintf_event_update(event, stdout);
97
98 dump_printf(": unhandled!\n");
99 return 0;
100}
101
102int process_event_sample_stub(const struct perf_tool *tool __maybe_unused,
103 union perf_event *event __maybe_unused,
104 struct perf_sample *sample __maybe_unused,
105 struct evsel *evsel __maybe_unused,
106 struct machine *machine __maybe_unused)
107{
108 dump_printf(": unhandled!\n");
109 return 0;
110}
111
112static int process_event_stub(const struct perf_tool *tool __maybe_unused,
113 union perf_event *event __maybe_unused,
114 struct perf_sample *sample __maybe_unused,
115 struct machine *machine __maybe_unused)
116{
117 dump_printf(": unhandled!\n");
118 return 0;
119}
120
121static int process_finished_round_stub(const struct perf_tool *tool __maybe_unused,
122 union perf_event *event __maybe_unused,
123 struct ordered_events *oe __maybe_unused)
124{
125 dump_printf(": unhandled!\n");
126 return 0;
127}
128
129static int skipn(int fd, off_t n)
130{
131 char buf[4096];
132 ssize_t ret;
133
134 while (n > 0) {
135 ret = read(fd, buf, min(n, (off_t)sizeof(buf)));
136 if (ret <= 0)
137 return ret;
138 n -= ret;
139 }
140
141 return 0;
142}
143
144static s64 process_event_auxtrace_stub(struct perf_session *session __maybe_unused,
145 union perf_event *event)
146{
147 dump_printf(": unhandled!\n");
148 if (perf_data__is_pipe(session->data))
149 skipn(perf_data__fd(session->data), event->auxtrace.size);
150 return event->auxtrace.size;
151}
152
153static int process_event_op2_stub(struct perf_session *session __maybe_unused,
154 union perf_event *event __maybe_unused)
155{
156 dump_printf(": unhandled!\n");
157 return 0;
158}
159
160
161static
162int process_event_thread_map_stub(struct perf_session *session __maybe_unused,
163 union perf_event *event __maybe_unused)
164{
165 if (dump_trace)
166 perf_event__fprintf_thread_map(event, stdout);
167
168 dump_printf(": unhandled!\n");
169 return 0;
170}
171
172static
173int process_event_cpu_map_stub(struct perf_session *session __maybe_unused,
174 union perf_event *event __maybe_unused)
175{
176 if (dump_trace)
177 perf_event__fprintf_cpu_map(event, stdout);
178
179 dump_printf(": unhandled!\n");
180 return 0;
181}
182
183static
184int process_event_stat_config_stub(struct perf_session *session __maybe_unused,
185 union perf_event *event __maybe_unused)
186{
187 if (dump_trace)
188 perf_event__fprintf_stat_config(event, stdout);
189
190 dump_printf(": unhandled!\n");
191 return 0;
192}
193
194static int process_stat_stub(struct perf_session *perf_session __maybe_unused,
195 union perf_event *event)
196{
197 if (dump_trace)
198 perf_event__fprintf_stat(event, stdout);
199
200 dump_printf(": unhandled!\n");
201 return 0;
202}
203
204static int process_stat_round_stub(struct perf_session *perf_session __maybe_unused,
205 union perf_event *event)
206{
207 if (dump_trace)
208 perf_event__fprintf_stat_round(event, stdout);
209
210 dump_printf(": unhandled!\n");
211 return 0;
212}
213
214static int process_event_time_conv_stub(struct perf_session *perf_session __maybe_unused,
215 union perf_event *event)
216{
217 if (dump_trace)
218 perf_event__fprintf_time_conv(event, stdout);
219
220 dump_printf(": unhandled!\n");
221 return 0;
222}
223
224static int perf_session__process_compressed_event_stub(struct perf_session *session __maybe_unused,
225 union perf_event *event __maybe_unused,
226 u64 file_offset __maybe_unused,
227 const char *file_path __maybe_unused)
228{
229 dump_printf(": unhandled!\n");
230 return 0;
231}
232
233void perf_tool__init(struct perf_tool *tool, bool ordered_events)
234{
235 tool->ordered_events = ordered_events;
236 tool->ordering_requires_timestamps = false;
237 tool->namespace_events = false;
238 tool->cgroup_events = false;
239 tool->no_warn = false;
240 tool->show_feat_hdr = SHOW_FEAT_NO_HEADER;
241
242 tool->sample = process_event_sample_stub;
243 tool->mmap = process_event_stub;
244 tool->mmap2 = process_event_stub;
245 tool->comm = process_event_stub;
246 tool->namespaces = process_event_stub;
247 tool->cgroup = process_event_stub;
248 tool->fork = process_event_stub;
249 tool->exit = process_event_stub;
250 tool->lost = perf_event__process_lost;
251 tool->lost_samples = perf_event__process_lost_samples;
252 tool->aux = perf_event__process_aux;
253 tool->itrace_start = perf_event__process_itrace_start;
254 tool->context_switch = perf_event__process_switch;
255 tool->ksymbol = perf_event__process_ksymbol;
256 tool->bpf = perf_event__process_bpf;
257 tool->text_poke = perf_event__process_text_poke;
258 tool->aux_output_hw_id = perf_event__process_aux_output_hw_id;
259 tool->read = process_event_sample_stub;
260 tool->throttle = process_event_stub;
261 tool->unthrottle = process_event_stub;
262 tool->attr = process_event_synth_attr_stub;
263 tool->event_update = process_event_synth_event_update_stub;
264 tool->tracing_data = process_event_synth_tracing_data_stub;
265 tool->build_id = process_event_op2_stub;
266
267 if (ordered_events)
268 tool->finished_round = perf_event__process_finished_round;
269 else
270 tool->finished_round = process_finished_round_stub;
271
272 tool->id_index = process_event_op2_stub;
273 tool->auxtrace_info = process_event_op2_stub;
274 tool->auxtrace = process_event_auxtrace_stub;
275 tool->auxtrace_error = process_event_op2_stub;
276 tool->thread_map = process_event_thread_map_stub;
277 tool->cpu_map = process_event_cpu_map_stub;
278 tool->stat_config = process_event_stat_config_stub;
279 tool->stat = process_stat_stub;
280 tool->stat_round = process_stat_round_stub;
281 tool->time_conv = process_event_time_conv_stub;
282 tool->feature = process_event_op2_stub;
283#ifdef HAVE_ZSTD_SUPPORT
284 tool->compressed = perf_session__process_compressed_event;
285#else
286 tool->compressed = perf_session__process_compressed_event_stub;
287#endif
288 tool->finished_init = process_event_op2_stub;
289}
290
291bool perf_tool__compressed_is_stub(const struct perf_tool *tool)
292{
293 return tool->compressed == perf_session__process_compressed_event_stub;
294}