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Commit | Line | Data |
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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> |
a5dec557 LZ |
12 | #include <linux/time.h> |
13 | ||
173ed24e | 14 | #include <asm/atomic.h> |
f984b51e PP |
15 | |
16 | #include "trace.h" | |
f0868d1e | 17 | #include "trace_output.h" |
f984b51e | 18 | |
d0a7e8ca PP |
19 | struct header_iter { |
20 | struct pci_dev *dev; | |
21 | }; | |
22 | ||
f984b51e | 23 | static struct trace_array *mmio_trace_array; |
2039238b | 24 | static bool overrun_detected; |
7ee1768d | 25 | static unsigned long prev_overruns; |
173ed24e | 26 | static atomic_t dropped_count; |
f984b51e | 27 | |
bd8ac686 PP |
28 | static void mmio_reset_data(struct trace_array *tr) |
29 | { | |
2039238b | 30 | overrun_detected = false; |
7ee1768d | 31 | prev_overruns = 0; |
bd8ac686 | 32 | |
213cc060 | 33 | tracing_reset_online_cpus(tr); |
bd8ac686 | 34 | } |
f984b51e | 35 | |
1c80025a | 36 | static int mmio_trace_init(struct trace_array *tr) |
f984b51e PP |
37 | { |
38 | pr_debug("in %s\n", __func__); | |
39 | mmio_trace_array = tr; | |
c76f0694 SR |
40 | |
41 | mmio_reset_data(tr); | |
42 | enable_mmiotrace(); | |
1c80025a | 43 | return 0; |
f984b51e PP |
44 | } |
45 | ||
46 | static void mmio_trace_reset(struct trace_array *tr) | |
47 | { | |
48 | pr_debug("in %s\n", __func__); | |
c76f0694 SR |
49 | |
50 | disable_mmiotrace(); | |
bd8ac686 PP |
51 | mmio_reset_data(tr); |
52 | mmio_trace_array = NULL; | |
f984b51e PP |
53 | } |
54 | ||
bbf5b1a0 | 55 | static void mmio_trace_start(struct trace_array *tr) |
f984b51e PP |
56 | { |
57 | pr_debug("in %s\n", __func__); | |
bbf5b1a0 | 58 | mmio_reset_data(tr); |
bd8ac686 PP |
59 | } |
60 | ||
13829537 PP |
61 | static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
62 | { | |
63 | int ret = 0; | |
64 | int i; | |
65 | resource_size_t start, end; | |
66 | const struct pci_driver *drv = pci_dev_driver(dev); | |
67 | ||
68 | /* XXX: incomplete checks for trace_seq_printf() return value */ | |
69 | ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", | |
70 | dev->bus->number, dev->devfn, | |
71 | dev->vendor, dev->device, dev->irq); | |
72 | /* | |
73 | * XXX: is pci_resource_to_user() appropriate, since we are | |
74 | * supposed to interpret the __ioremap() phys_addr argument based on | |
75 | * these printed values? | |
76 | */ | |
77 | for (i = 0; i < 7; i++) { | |
78 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
79 | ret += trace_seq_printf(s, " %llx", | |
80 | (unsigned long long)(start | | |
81 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
82 | } | |
83 | for (i = 0; i < 7; i++) { | |
84 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
85 | ret += trace_seq_printf(s, " %llx", | |
86 | dev->resource[i].start < dev->resource[i].end ? | |
87 | (unsigned long long)(end - start) + 1 : 0); | |
88 | } | |
89 | if (drv) | |
90 | ret += trace_seq_printf(s, " %s\n", drv->name); | |
91 | else | |
92 | ret += trace_seq_printf(s, " \n"); | |
93 | return ret; | |
94 | } | |
95 | ||
d0a7e8ca PP |
96 | static void destroy_header_iter(struct header_iter *hiter) |
97 | { | |
98 | if (!hiter) | |
99 | return; | |
100 | pci_dev_put(hiter->dev); | |
101 | kfree(hiter); | |
102 | } | |
103 | ||
104 | static void mmio_pipe_open(struct trace_iterator *iter) | |
bd8ac686 | 105 | { |
d0a7e8ca | 106 | struct header_iter *hiter; |
bd8ac686 | 107 | struct trace_seq *s = &iter->seq; |
13829537 PP |
108 | |
109 | trace_seq_printf(s, "VERSION 20070824\n"); | |
110 | ||
d0a7e8ca PP |
111 | hiter = kzalloc(sizeof(*hiter), GFP_KERNEL); |
112 | if (!hiter) | |
113 | return; | |
114 | ||
115 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
116 | iter->private = hiter; | |
117 | } | |
118 | ||
119 | /* XXX: This is not called when the pipe is closed! */ | |
120 | static void mmio_close(struct trace_iterator *iter) | |
121 | { | |
122 | struct header_iter *hiter = iter->private; | |
123 | destroy_header_iter(hiter); | |
124 | iter->private = NULL; | |
125 | } | |
126 | ||
2039238b PP |
127 | static unsigned long count_overruns(struct trace_iterator *iter) |
128 | { | |
173ed24e | 129 | unsigned long cnt = atomic_xchg(&dropped_count, 0); |
7ee1768d PP |
130 | unsigned long over = ring_buffer_overruns(iter->tr->buffer); |
131 | ||
132 | if (over > prev_overruns) | |
173ed24e | 133 | cnt += over - prev_overruns; |
7ee1768d | 134 | prev_overruns = over; |
2039238b PP |
135 | return cnt; |
136 | } | |
137 | ||
d0a7e8ca PP |
138 | static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, |
139 | char __user *ubuf, size_t cnt, loff_t *ppos) | |
140 | { | |
141 | ssize_t ret; | |
142 | struct header_iter *hiter = iter->private; | |
143 | struct trace_seq *s = &iter->seq; | |
2039238b PP |
144 | unsigned long n; |
145 | ||
146 | n = count_overruns(iter); | |
147 | if (n) { | |
148 | /* XXX: This is later than where events were lost. */ | |
149 | trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n); | |
150 | if (!overrun_detected) | |
151 | pr_warning("mmiotrace has lost events.\n"); | |
152 | overrun_detected = true; | |
153 | goto print_out; | |
154 | } | |
d0a7e8ca PP |
155 | |
156 | if (!hiter) | |
157 | return 0; | |
158 | ||
159 | mmio_print_pcidev(s, hiter->dev); | |
160 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev); | |
161 | ||
162 | if (!hiter->dev) { | |
163 | destroy_header_iter(hiter); | |
164 | iter->private = NULL; | |
165 | } | |
166 | ||
2039238b | 167 | print_out: |
d0a7e8ca PP |
168 | ret = trace_seq_to_user(s, ubuf, cnt); |
169 | return (ret == -EBUSY) ? 0 : ret; | |
bd8ac686 PP |
170 | } |
171 | ||
07f4e4f7 | 172 | static enum print_line_t mmio_print_rw(struct trace_iterator *iter) |
bd8ac686 PP |
173 | { |
174 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
175 | struct trace_mmiotrace_rw *field; |
176 | struct mmiotrace_rw *rw; | |
bd8ac686 | 177 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 178 | unsigned long long t = ns2usecs(iter->ts); |
a5dec557 | 179 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
bd8ac686 PP |
180 | unsigned secs = (unsigned long)t; |
181 | int ret = 1; | |
182 | ||
7104f300 SR |
183 | trace_assign_type(field, entry); |
184 | rw = &field->rw; | |
185 | ||
777e208d | 186 | switch (rw->opcode) { |
bd8ac686 PP |
187 | case MMIO_READ: |
188 | ret = trace_seq_printf(s, | |
5e4abc98 | 189 | "R %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
190 | rw->width, secs, usec_rem, rw->map_id, |
191 | (unsigned long long)rw->phys, | |
736ca61f | 192 | rw->value, rw->pc, 0); |
bd8ac686 PP |
193 | break; |
194 | case MMIO_WRITE: | |
195 | ret = trace_seq_printf(s, | |
5e4abc98 | 196 | "W %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
197 | rw->width, secs, usec_rem, rw->map_id, |
198 | (unsigned long long)rw->phys, | |
736ca61f | 199 | rw->value, rw->pc, 0); |
bd8ac686 PP |
200 | break; |
201 | case MMIO_UNKNOWN_OP: | |
202 | ret = trace_seq_printf(s, | |
5e4abc98 SR |
203 | "UNKNOWN %u.%06lu %d 0x%llx %02lx,%02lx," |
204 | "%02lx 0x%lx %d\n", | |
dee310d0 PP |
205 | secs, usec_rem, rw->map_id, |
206 | (unsigned long long)rw->phys, | |
bd8ac686 | 207 | (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff, |
736ca61f | 208 | (rw->value >> 0) & 0xff, rw->pc, 0); |
bd8ac686 PP |
209 | break; |
210 | default: | |
211 | ret = trace_seq_printf(s, "rw what?\n"); | |
212 | break; | |
213 | } | |
214 | if (ret) | |
07f4e4f7 FW |
215 | return TRACE_TYPE_HANDLED; |
216 | return TRACE_TYPE_PARTIAL_LINE; | |
bd8ac686 PP |
217 | } |
218 | ||
07f4e4f7 | 219 | static enum print_line_t mmio_print_map(struct trace_iterator *iter) |
bd8ac686 PP |
220 | { |
221 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
222 | struct trace_mmiotrace_map *field; |
223 | struct mmiotrace_map *m; | |
bd8ac686 | 224 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 225 | unsigned long long t = ns2usecs(iter->ts); |
a5dec557 | 226 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
bd8ac686 | 227 | unsigned secs = (unsigned long)t; |
07f4e4f7 | 228 | int ret; |
bd8ac686 | 229 | |
7104f300 SR |
230 | trace_assign_type(field, entry); |
231 | m = &field->map; | |
232 | ||
777e208d | 233 | switch (m->opcode) { |
bd8ac686 PP |
234 | case MMIO_PROBE: |
235 | ret = trace_seq_printf(s, | |
5e4abc98 | 236 | "MAP %u.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
237 | secs, usec_rem, m->map_id, |
238 | (unsigned long long)m->phys, m->virt, m->len, | |
e0fd5c2f | 239 | 0UL, 0); |
bd8ac686 PP |
240 | break; |
241 | case MMIO_UNPROBE: | |
242 | ret = trace_seq_printf(s, | |
5e4abc98 | 243 | "UNMAP %u.%06lu %d 0x%lx %d\n", |
e0fd5c2f | 244 | secs, usec_rem, m->map_id, 0UL, 0); |
bd8ac686 PP |
245 | break; |
246 | default: | |
247 | ret = trace_seq_printf(s, "map what?\n"); | |
248 | break; | |
249 | } | |
250 | if (ret) | |
07f4e4f7 FW |
251 | return TRACE_TYPE_HANDLED; |
252 | return TRACE_TYPE_PARTIAL_LINE; | |
bd8ac686 PP |
253 | } |
254 | ||
07f4e4f7 | 255 | static enum print_line_t mmio_print_mark(struct trace_iterator *iter) |
fc5e27ae PP |
256 | { |
257 | struct trace_entry *entry = iter->ent; | |
777e208d | 258 | struct print_entry *print = (struct print_entry *)entry; |
48ead020 | 259 | const char *msg = print->buf; |
fc5e27ae | 260 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 261 | unsigned long long t = ns2usecs(iter->ts); |
769b0441 | 262 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
fc5e27ae PP |
263 | unsigned secs = (unsigned long)t; |
264 | int ret; | |
265 | ||
266 | /* The trailing newline must be in the message. */ | |
48ead020 | 267 | ret = trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg); |
fc5e27ae | 268 | if (!ret) |
07f4e4f7 | 269 | return TRACE_TYPE_PARTIAL_LINE; |
fc5e27ae | 270 | |
07f4e4f7 | 271 | return TRACE_TYPE_HANDLED; |
fc5e27ae PP |
272 | } |
273 | ||
07f4e4f7 | 274 | static enum print_line_t mmio_print_line(struct trace_iterator *iter) |
bd8ac686 PP |
275 | { |
276 | switch (iter->ent->type) { | |
277 | case TRACE_MMIO_RW: | |
278 | return mmio_print_rw(iter); | |
279 | case TRACE_MMIO_MAP: | |
280 | return mmio_print_map(iter); | |
fc5e27ae PP |
281 | case TRACE_PRINT: |
282 | return mmio_print_mark(iter); | |
bd8ac686 | 283 | default: |
07f4e4f7 | 284 | return TRACE_TYPE_HANDLED; /* ignore unknown entries */ |
bd8ac686 | 285 | } |
f984b51e PP |
286 | } |
287 | ||
288 | static struct tracer mmio_tracer __read_mostly = | |
289 | { | |
290 | .name = "mmiotrace", | |
291 | .init = mmio_trace_init, | |
292 | .reset = mmio_trace_reset, | |
bbf5b1a0 | 293 | .start = mmio_trace_start, |
d0a7e8ca PP |
294 | .pipe_open = mmio_pipe_open, |
295 | .close = mmio_close, | |
296 | .read = mmio_read, | |
bd8ac686 | 297 | .print_line = mmio_print_line, |
f984b51e PP |
298 | }; |
299 | ||
300 | __init static int init_mmio_trace(void) | |
301 | { | |
f984b51e PP |
302 | return register_tracer(&mmio_tracer); |
303 | } | |
304 | device_initcall(init_mmio_trace); | |
305 | ||
45dcd8b8 PP |
306 | static void __trace_mmiotrace_rw(struct trace_array *tr, |
307 | struct trace_array_cpu *data, | |
308 | struct mmiotrace_rw *rw) | |
309 | { | |
60ba7702 | 310 | struct ftrace_event_call *call = &event_mmiotrace_rw; |
e77405ad | 311 | struct ring_buffer *buffer = tr->buffer; |
3928a8a2 | 312 | struct ring_buffer_event *event; |
777e208d | 313 | struct trace_mmiotrace_rw *entry; |
51a763dd | 314 | int pc = preempt_count(); |
45dcd8b8 | 315 | |
e77405ad | 316 | event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_RW, |
51a763dd | 317 | sizeof(*entry), 0, pc); |
173ed24e PP |
318 | if (!event) { |
319 | atomic_inc(&dropped_count); | |
3928a8a2 | 320 | return; |
173ed24e | 321 | } |
3928a8a2 | 322 | entry = ring_buffer_event_data(event); |
777e208d | 323 | entry->rw = *rw; |
60ba7702 SR |
324 | |
325 | if (!filter_check_discard(call, entry, buffer, event)) | |
326 | trace_buffer_unlock_commit(buffer, event, 0, pc); | |
45dcd8b8 PP |
327 | } |
328 | ||
bd8ac686 | 329 | void mmio_trace_rw(struct mmiotrace_rw *rw) |
f984b51e PP |
330 | { |
331 | struct trace_array *tr = mmio_trace_array; | |
332 | struct trace_array_cpu *data = tr->data[smp_processor_id()]; | |
bd8ac686 PP |
333 | __trace_mmiotrace_rw(tr, data, rw); |
334 | } | |
f984b51e | 335 | |
45dcd8b8 PP |
336 | static void __trace_mmiotrace_map(struct trace_array *tr, |
337 | struct trace_array_cpu *data, | |
338 | struct mmiotrace_map *map) | |
339 | { | |
60ba7702 | 340 | struct ftrace_event_call *call = &event_mmiotrace_map; |
e77405ad | 341 | struct ring_buffer *buffer = tr->buffer; |
3928a8a2 | 342 | struct ring_buffer_event *event; |
777e208d | 343 | struct trace_mmiotrace_map *entry; |
51a763dd | 344 | int pc = preempt_count(); |
45dcd8b8 | 345 | |
e77405ad | 346 | event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_MAP, |
51a763dd | 347 | sizeof(*entry), 0, pc); |
173ed24e PP |
348 | if (!event) { |
349 | atomic_inc(&dropped_count); | |
3928a8a2 | 350 | return; |
173ed24e | 351 | } |
3928a8a2 | 352 | entry = ring_buffer_event_data(event); |
777e208d | 353 | entry->map = *map; |
60ba7702 SR |
354 | |
355 | if (!filter_check_discard(call, entry, buffer, event)) | |
356 | trace_buffer_unlock_commit(buffer, event, 0, pc); | |
45dcd8b8 PP |
357 | } |
358 | ||
bd8ac686 PP |
359 | void mmio_trace_mapping(struct mmiotrace_map *map) |
360 | { | |
361 | struct trace_array *tr = mmio_trace_array; | |
362 | struct trace_array_cpu *data; | |
363 | ||
364 | preempt_disable(); | |
365 | data = tr->data[smp_processor_id()]; | |
366 | __trace_mmiotrace_map(tr, data, map); | |
367 | preempt_enable(); | |
f984b51e | 368 | } |
9e57fb35 PP |
369 | |
370 | int mmio_trace_printk(const char *fmt, va_list args) | |
371 | { | |
40ce74f1 | 372 | return trace_vprintk(0, fmt, args); |
9e57fb35 | 373 | } |