Commit | Line | Data |
---|---|---|
f984b51e PP |
1 | /* |
2 | * Memory mapped I/O tracing | |
3 | * | |
4 | * Copyright (C) 2008 Pekka Paalanen <pq@iki.fi> | |
5 | */ | |
6 | ||
7 | #define DEBUG 1 | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/mmiotrace.h> | |
13829537 | 11 | #include <linux/pci.h> |
f984b51e PP |
12 | |
13 | #include "trace.h" | |
14 | ||
d0a7e8ca PP |
15 | struct header_iter { |
16 | struct pci_dev *dev; | |
17 | }; | |
18 | ||
f984b51e | 19 | static struct trace_array *mmio_trace_array; |
2039238b | 20 | static bool overrun_detected; |
7ee1768d | 21 | static unsigned long prev_overruns; |
f984b51e | 22 | |
bd8ac686 PP |
23 | static void mmio_reset_data(struct trace_array *tr) |
24 | { | |
25 | int cpu; | |
26 | ||
2039238b | 27 | overrun_detected = false; |
7ee1768d | 28 | prev_overruns = 0; |
bd8ac686 PP |
29 | tr->time_start = ftrace_now(tr->cpu); |
30 | ||
31 | for_each_online_cpu(cpu) | |
3928a8a2 | 32 | tracing_reset(tr, cpu); |
bd8ac686 | 33 | } |
f984b51e PP |
34 | |
35 | static void mmio_trace_init(struct trace_array *tr) | |
36 | { | |
37 | pr_debug("in %s\n", __func__); | |
38 | mmio_trace_array = tr; | |
bd8ac686 PP |
39 | if (tr->ctrl) { |
40 | mmio_reset_data(tr); | |
f984b51e | 41 | enable_mmiotrace(); |
bd8ac686 | 42 | } |
f984b51e PP |
43 | } |
44 | ||
45 | static void mmio_trace_reset(struct trace_array *tr) | |
46 | { | |
47 | pr_debug("in %s\n", __func__); | |
48 | if (tr->ctrl) | |
49 | disable_mmiotrace(); | |
bd8ac686 PP |
50 | mmio_reset_data(tr); |
51 | mmio_trace_array = NULL; | |
f984b51e PP |
52 | } |
53 | ||
54 | static void mmio_trace_ctrl_update(struct trace_array *tr) | |
55 | { | |
56 | pr_debug("in %s\n", __func__); | |
bd8ac686 PP |
57 | if (tr->ctrl) { |
58 | mmio_reset_data(tr); | |
f984b51e | 59 | enable_mmiotrace(); |
bd8ac686 | 60 | } else { |
f984b51e | 61 | disable_mmiotrace(); |
bd8ac686 PP |
62 | } |
63 | } | |
64 | ||
13829537 PP |
65 | static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
66 | { | |
67 | int ret = 0; | |
68 | int i; | |
69 | resource_size_t start, end; | |
70 | const struct pci_driver *drv = pci_dev_driver(dev); | |
71 | ||
72 | /* XXX: incomplete checks for trace_seq_printf() return value */ | |
73 | ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", | |
74 | dev->bus->number, dev->devfn, | |
75 | dev->vendor, dev->device, dev->irq); | |
76 | /* | |
77 | * XXX: is pci_resource_to_user() appropriate, since we are | |
78 | * supposed to interpret the __ioremap() phys_addr argument based on | |
79 | * these printed values? | |
80 | */ | |
81 | for (i = 0; i < 7; i++) { | |
82 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
83 | ret += trace_seq_printf(s, " %llx", | |
84 | (unsigned long long)(start | | |
85 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
86 | } | |
87 | for (i = 0; i < 7; i++) { | |
88 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
89 | ret += trace_seq_printf(s, " %llx", | |
90 | dev->resource[i].start < dev->resource[i].end ? | |
91 | (unsigned long long)(end - start) + 1 : 0); | |
92 | } | |
93 | if (drv) | |
94 | ret += trace_seq_printf(s, " %s\n", drv->name); | |
95 | else | |
96 | ret += trace_seq_printf(s, " \n"); | |
97 | return ret; | |
98 | } | |
99 | ||
d0a7e8ca PP |
100 | static void destroy_header_iter(struct header_iter *hiter) |
101 | { | |
102 | if (!hiter) | |
103 | return; | |
104 | pci_dev_put(hiter->dev); | |
105 | kfree(hiter); | |
106 | } | |
107 | ||
108 | static void mmio_pipe_open(struct trace_iterator *iter) | |
bd8ac686 | 109 | { |
d0a7e8ca | 110 | struct header_iter *hiter; |
bd8ac686 | 111 | struct trace_seq *s = &iter->seq; |
13829537 PP |
112 | |
113 | trace_seq_printf(s, "VERSION 20070824\n"); | |
114 | ||
d0a7e8ca PP |
115 | hiter = kzalloc(sizeof(*hiter), GFP_KERNEL); |
116 | if (!hiter) | |
117 | return; | |
118 | ||
119 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
120 | iter->private = hiter; | |
121 | } | |
122 | ||
123 | /* XXX: This is not called when the pipe is closed! */ | |
124 | static void mmio_close(struct trace_iterator *iter) | |
125 | { | |
126 | struct header_iter *hiter = iter->private; | |
127 | destroy_header_iter(hiter); | |
128 | iter->private = NULL; | |
129 | } | |
130 | ||
2039238b PP |
131 | static unsigned long count_overruns(struct trace_iterator *iter) |
132 | { | |
2039238b | 133 | unsigned long cnt = 0; |
7ee1768d PP |
134 | unsigned long over = ring_buffer_overruns(iter->tr->buffer); |
135 | ||
136 | if (over > prev_overruns) | |
137 | cnt = over - prev_overruns; | |
138 | prev_overruns = over; | |
2039238b PP |
139 | return cnt; |
140 | } | |
141 | ||
d0a7e8ca PP |
142 | static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, |
143 | char __user *ubuf, size_t cnt, loff_t *ppos) | |
144 | { | |
145 | ssize_t ret; | |
146 | struct header_iter *hiter = iter->private; | |
147 | struct trace_seq *s = &iter->seq; | |
2039238b PP |
148 | unsigned long n; |
149 | ||
150 | n = count_overruns(iter); | |
151 | if (n) { | |
152 | /* XXX: This is later than where events were lost. */ | |
153 | trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n); | |
154 | if (!overrun_detected) | |
155 | pr_warning("mmiotrace has lost events.\n"); | |
156 | overrun_detected = true; | |
157 | goto print_out; | |
158 | } | |
d0a7e8ca PP |
159 | |
160 | if (!hiter) | |
161 | return 0; | |
162 | ||
163 | mmio_print_pcidev(s, hiter->dev); | |
164 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev); | |
165 | ||
166 | if (!hiter->dev) { | |
167 | destroy_header_iter(hiter); | |
168 | iter->private = NULL; | |
169 | } | |
170 | ||
2039238b | 171 | print_out: |
d0a7e8ca PP |
172 | ret = trace_seq_to_user(s, ubuf, cnt); |
173 | return (ret == -EBUSY) ? 0 : ret; | |
bd8ac686 PP |
174 | } |
175 | ||
07f4e4f7 | 176 | static enum print_line_t mmio_print_rw(struct trace_iterator *iter) |
bd8ac686 PP |
177 | { |
178 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
179 | struct trace_mmiotrace_rw *field; |
180 | struct mmiotrace_rw *rw; | |
bd8ac686 | 181 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 182 | unsigned long long t = ns2usecs(iter->ts); |
bd8ac686 PP |
183 | unsigned long usec_rem = do_div(t, 1000000ULL); |
184 | unsigned secs = (unsigned long)t; | |
185 | int ret = 1; | |
186 | ||
7104f300 SR |
187 | trace_assign_type(field, entry); |
188 | rw = &field->rw; | |
189 | ||
777e208d | 190 | switch (rw->opcode) { |
bd8ac686 PP |
191 | case MMIO_READ: |
192 | ret = trace_seq_printf(s, | |
dee310d0 PP |
193 | "R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
194 | rw->width, secs, usec_rem, rw->map_id, | |
195 | (unsigned long long)rw->phys, | |
736ca61f | 196 | rw->value, rw->pc, 0); |
bd8ac686 PP |
197 | break; |
198 | case MMIO_WRITE: | |
199 | ret = trace_seq_printf(s, | |
dee310d0 PP |
200 | "W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
201 | rw->width, secs, usec_rem, rw->map_id, | |
202 | (unsigned long long)rw->phys, | |
736ca61f | 203 | rw->value, rw->pc, 0); |
bd8ac686 PP |
204 | break; |
205 | case MMIO_UNKNOWN_OP: | |
206 | ret = trace_seq_printf(s, | |
dee310d0 PP |
207 | "UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n", |
208 | secs, usec_rem, rw->map_id, | |
209 | (unsigned long long)rw->phys, | |
bd8ac686 | 210 | (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff, |
736ca61f | 211 | (rw->value >> 0) & 0xff, rw->pc, 0); |
bd8ac686 PP |
212 | break; |
213 | default: | |
214 | ret = trace_seq_printf(s, "rw what?\n"); | |
215 | break; | |
216 | } | |
217 | if (ret) | |
07f4e4f7 FW |
218 | return TRACE_TYPE_HANDLED; |
219 | return TRACE_TYPE_PARTIAL_LINE; | |
bd8ac686 PP |
220 | } |
221 | ||
07f4e4f7 | 222 | static enum print_line_t mmio_print_map(struct trace_iterator *iter) |
bd8ac686 PP |
223 | { |
224 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
225 | struct trace_mmiotrace_map *field; |
226 | struct mmiotrace_map *m; | |
bd8ac686 | 227 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 228 | unsigned long long t = ns2usecs(iter->ts); |
bd8ac686 PP |
229 | unsigned long usec_rem = do_div(t, 1000000ULL); |
230 | unsigned secs = (unsigned long)t; | |
07f4e4f7 | 231 | int ret; |
bd8ac686 | 232 | |
7104f300 SR |
233 | trace_assign_type(field, entry); |
234 | m = &field->map; | |
235 | ||
777e208d | 236 | switch (m->opcode) { |
bd8ac686 PP |
237 | case MMIO_PROBE: |
238 | ret = trace_seq_printf(s, | |
dee310d0 PP |
239 | "MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
240 | secs, usec_rem, m->map_id, | |
241 | (unsigned long long)m->phys, m->virt, m->len, | |
e0fd5c2f | 242 | 0UL, 0); |
bd8ac686 PP |
243 | break; |
244 | case MMIO_UNPROBE: | |
245 | ret = trace_seq_printf(s, | |
246 | "UNMAP %lu.%06lu %d 0x%lx %d\n", | |
e0fd5c2f | 247 | secs, usec_rem, m->map_id, 0UL, 0); |
bd8ac686 PP |
248 | break; |
249 | default: | |
250 | ret = trace_seq_printf(s, "map what?\n"); | |
251 | break; | |
252 | } | |
253 | if (ret) | |
07f4e4f7 FW |
254 | return TRACE_TYPE_HANDLED; |
255 | return TRACE_TYPE_PARTIAL_LINE; | |
bd8ac686 PP |
256 | } |
257 | ||
07f4e4f7 | 258 | static enum print_line_t mmio_print_mark(struct trace_iterator *iter) |
fc5e27ae PP |
259 | { |
260 | struct trace_entry *entry = iter->ent; | |
777e208d SR |
261 | struct print_entry *print = (struct print_entry *)entry; |
262 | const char *msg = print->buf; | |
fc5e27ae | 263 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 264 | unsigned long long t = ns2usecs(iter->ts); |
fc5e27ae PP |
265 | unsigned long usec_rem = do_div(t, 1000000ULL); |
266 | unsigned secs = (unsigned long)t; | |
267 | int ret; | |
268 | ||
269 | /* The trailing newline must be in the message. */ | |
270 | ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg); | |
271 | if (!ret) | |
07f4e4f7 | 272 | return TRACE_TYPE_PARTIAL_LINE; |
fc5e27ae | 273 | |
777e208d | 274 | if (entry->flags & TRACE_FLAG_CONT) |
fc5e27ae PP |
275 | trace_seq_print_cont(s, iter); |
276 | ||
07f4e4f7 | 277 | return TRACE_TYPE_HANDLED; |
fc5e27ae PP |
278 | } |
279 | ||
07f4e4f7 | 280 | static enum print_line_t mmio_print_line(struct trace_iterator *iter) |
bd8ac686 PP |
281 | { |
282 | switch (iter->ent->type) { | |
283 | case TRACE_MMIO_RW: | |
284 | return mmio_print_rw(iter); | |
285 | case TRACE_MMIO_MAP: | |
286 | return mmio_print_map(iter); | |
fc5e27ae PP |
287 | case TRACE_PRINT: |
288 | return mmio_print_mark(iter); | |
bd8ac686 | 289 | default: |
07f4e4f7 | 290 | return TRACE_TYPE_HANDLED; /* ignore unknown entries */ |
bd8ac686 | 291 | } |
f984b51e PP |
292 | } |
293 | ||
294 | static struct tracer mmio_tracer __read_mostly = | |
295 | { | |
296 | .name = "mmiotrace", | |
297 | .init = mmio_trace_init, | |
298 | .reset = mmio_trace_reset, | |
d0a7e8ca PP |
299 | .pipe_open = mmio_pipe_open, |
300 | .close = mmio_close, | |
301 | .read = mmio_read, | |
f984b51e | 302 | .ctrl_update = mmio_trace_ctrl_update, |
bd8ac686 | 303 | .print_line = mmio_print_line, |
f984b51e PP |
304 | }; |
305 | ||
306 | __init static int init_mmio_trace(void) | |
307 | { | |
f984b51e PP |
308 | return register_tracer(&mmio_tracer); |
309 | } | |
310 | device_initcall(init_mmio_trace); | |
311 | ||
45dcd8b8 PP |
312 | static void __trace_mmiotrace_rw(struct trace_array *tr, |
313 | struct trace_array_cpu *data, | |
314 | struct mmiotrace_rw *rw) | |
315 | { | |
3928a8a2 | 316 | struct ring_buffer_event *event; |
777e208d | 317 | struct trace_mmiotrace_rw *entry; |
45dcd8b8 PP |
318 | unsigned long irq_flags; |
319 | ||
3928a8a2 SR |
320 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
321 | &irq_flags); | |
322 | if (!event) | |
323 | return; | |
324 | entry = ring_buffer_event_data(event); | |
38697053 | 325 | tracing_generic_entry_update(&entry->ent, 0, preempt_count()); |
777e208d SR |
326 | entry->ent.type = TRACE_MMIO_RW; |
327 | entry->rw = *rw; | |
3928a8a2 | 328 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
329 | |
330 | trace_wake_up(); | |
331 | } | |
332 | ||
bd8ac686 | 333 | void mmio_trace_rw(struct mmiotrace_rw *rw) |
f984b51e PP |
334 | { |
335 | struct trace_array *tr = mmio_trace_array; | |
336 | struct trace_array_cpu *data = tr->data[smp_processor_id()]; | |
bd8ac686 PP |
337 | __trace_mmiotrace_rw(tr, data, rw); |
338 | } | |
f984b51e | 339 | |
45dcd8b8 PP |
340 | static void __trace_mmiotrace_map(struct trace_array *tr, |
341 | struct trace_array_cpu *data, | |
342 | struct mmiotrace_map *map) | |
343 | { | |
3928a8a2 | 344 | struct ring_buffer_event *event; |
777e208d | 345 | struct trace_mmiotrace_map *entry; |
45dcd8b8 PP |
346 | unsigned long irq_flags; |
347 | ||
3928a8a2 SR |
348 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
349 | &irq_flags); | |
350 | if (!event) | |
351 | return; | |
352 | entry = ring_buffer_event_data(event); | |
38697053 | 353 | tracing_generic_entry_update(&entry->ent, 0, preempt_count()); |
777e208d SR |
354 | entry->ent.type = TRACE_MMIO_MAP; |
355 | entry->map = *map; | |
3928a8a2 | 356 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
357 | |
358 | trace_wake_up(); | |
359 | } | |
360 | ||
bd8ac686 PP |
361 | void mmio_trace_mapping(struct mmiotrace_map *map) |
362 | { | |
363 | struct trace_array *tr = mmio_trace_array; | |
364 | struct trace_array_cpu *data; | |
365 | ||
366 | preempt_disable(); | |
367 | data = tr->data[smp_processor_id()]; | |
368 | __trace_mmiotrace_map(tr, data, map); | |
369 | preempt_enable(); | |
f984b51e | 370 | } |
9e57fb35 PP |
371 | |
372 | int mmio_trace_printk(const char *fmt, va_list args) | |
373 | { | |
374 | return trace_vprintk(0, fmt, args); | |
375 | } |