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 | 34 | |
1c80025a | 35 | static int mmio_trace_init(struct trace_array *tr) |
f984b51e PP |
36 | { |
37 | pr_debug("in %s\n", __func__); | |
38 | mmio_trace_array = tr; | |
c76f0694 SR |
39 | |
40 | mmio_reset_data(tr); | |
41 | enable_mmiotrace(); | |
1c80025a | 42 | return 0; |
f984b51e PP |
43 | } |
44 | ||
45 | static void mmio_trace_reset(struct trace_array *tr) | |
46 | { | |
47 | pr_debug("in %s\n", __func__); | |
c76f0694 SR |
48 | |
49 | disable_mmiotrace(); | |
bd8ac686 PP |
50 | mmio_reset_data(tr); |
51 | mmio_trace_array = NULL; | |
f984b51e PP |
52 | } |
53 | ||
bbf5b1a0 | 54 | static void mmio_trace_start(struct trace_array *tr) |
f984b51e PP |
55 | { |
56 | pr_debug("in %s\n", __func__); | |
bbf5b1a0 | 57 | mmio_reset_data(tr); |
bd8ac686 PP |
58 | } |
59 | ||
13829537 PP |
60 | static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
61 | { | |
62 | int ret = 0; | |
63 | int i; | |
64 | resource_size_t start, end; | |
65 | const struct pci_driver *drv = pci_dev_driver(dev); | |
66 | ||
67 | /* XXX: incomplete checks for trace_seq_printf() return value */ | |
68 | ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", | |
69 | dev->bus->number, dev->devfn, | |
70 | dev->vendor, dev->device, dev->irq); | |
71 | /* | |
72 | * XXX: is pci_resource_to_user() appropriate, since we are | |
73 | * supposed to interpret the __ioremap() phys_addr argument based on | |
74 | * these printed values? | |
75 | */ | |
76 | for (i = 0; i < 7; i++) { | |
77 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
78 | ret += trace_seq_printf(s, " %llx", | |
79 | (unsigned long long)(start | | |
80 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
81 | } | |
82 | for (i = 0; i < 7; i++) { | |
83 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
84 | ret += trace_seq_printf(s, " %llx", | |
85 | dev->resource[i].start < dev->resource[i].end ? | |
86 | (unsigned long long)(end - start) + 1 : 0); | |
87 | } | |
88 | if (drv) | |
89 | ret += trace_seq_printf(s, " %s\n", drv->name); | |
90 | else | |
91 | ret += trace_seq_printf(s, " \n"); | |
92 | return ret; | |
93 | } | |
94 | ||
d0a7e8ca PP |
95 | static void destroy_header_iter(struct header_iter *hiter) |
96 | { | |
97 | if (!hiter) | |
98 | return; | |
99 | pci_dev_put(hiter->dev); | |
100 | kfree(hiter); | |
101 | } | |
102 | ||
103 | static void mmio_pipe_open(struct trace_iterator *iter) | |
bd8ac686 | 104 | { |
d0a7e8ca | 105 | struct header_iter *hiter; |
bd8ac686 | 106 | struct trace_seq *s = &iter->seq; |
13829537 PP |
107 | |
108 | trace_seq_printf(s, "VERSION 20070824\n"); | |
109 | ||
d0a7e8ca PP |
110 | hiter = kzalloc(sizeof(*hiter), GFP_KERNEL); |
111 | if (!hiter) | |
112 | return; | |
113 | ||
114 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
115 | iter->private = hiter; | |
116 | } | |
117 | ||
118 | /* XXX: This is not called when the pipe is closed! */ | |
119 | static void mmio_close(struct trace_iterator *iter) | |
120 | { | |
121 | struct header_iter *hiter = iter->private; | |
122 | destroy_header_iter(hiter); | |
123 | iter->private = NULL; | |
124 | } | |
125 | ||
2039238b PP |
126 | static unsigned long count_overruns(struct trace_iterator *iter) |
127 | { | |
2039238b | 128 | unsigned long cnt = 0; |
7ee1768d PP |
129 | unsigned long over = ring_buffer_overruns(iter->tr->buffer); |
130 | ||
131 | if (over > prev_overruns) | |
132 | cnt = over - prev_overruns; | |
133 | prev_overruns = over; | |
2039238b PP |
134 | return cnt; |
135 | } | |
136 | ||
d0a7e8ca PP |
137 | static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, |
138 | char __user *ubuf, size_t cnt, loff_t *ppos) | |
139 | { | |
140 | ssize_t ret; | |
141 | struct header_iter *hiter = iter->private; | |
142 | struct trace_seq *s = &iter->seq; | |
2039238b PP |
143 | unsigned long n; |
144 | ||
145 | n = count_overruns(iter); | |
146 | if (n) { | |
147 | /* XXX: This is later than where events were lost. */ | |
148 | trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n); | |
149 | if (!overrun_detected) | |
150 | pr_warning("mmiotrace has lost events.\n"); | |
151 | overrun_detected = true; | |
152 | goto print_out; | |
153 | } | |
d0a7e8ca PP |
154 | |
155 | if (!hiter) | |
156 | return 0; | |
157 | ||
158 | mmio_print_pcidev(s, hiter->dev); | |
159 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev); | |
160 | ||
161 | if (!hiter->dev) { | |
162 | destroy_header_iter(hiter); | |
163 | iter->private = NULL; | |
164 | } | |
165 | ||
2039238b | 166 | print_out: |
d0a7e8ca PP |
167 | ret = trace_seq_to_user(s, ubuf, cnt); |
168 | return (ret == -EBUSY) ? 0 : ret; | |
bd8ac686 PP |
169 | } |
170 | ||
07f4e4f7 | 171 | static enum print_line_t mmio_print_rw(struct trace_iterator *iter) |
bd8ac686 PP |
172 | { |
173 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
174 | struct trace_mmiotrace_rw *field; |
175 | struct mmiotrace_rw *rw; | |
bd8ac686 | 176 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 177 | unsigned long long t = ns2usecs(iter->ts); |
bd8ac686 PP |
178 | unsigned long usec_rem = do_div(t, 1000000ULL); |
179 | unsigned secs = (unsigned long)t; | |
180 | int ret = 1; | |
181 | ||
7104f300 SR |
182 | trace_assign_type(field, entry); |
183 | rw = &field->rw; | |
184 | ||
777e208d | 185 | switch (rw->opcode) { |
bd8ac686 PP |
186 | case MMIO_READ: |
187 | ret = trace_seq_printf(s, | |
dee310d0 PP |
188 | "R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
189 | rw->width, secs, usec_rem, rw->map_id, | |
190 | (unsigned long long)rw->phys, | |
736ca61f | 191 | rw->value, rw->pc, 0); |
bd8ac686 PP |
192 | break; |
193 | case MMIO_WRITE: | |
194 | ret = trace_seq_printf(s, | |
dee310d0 PP |
195 | "W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
196 | rw->width, secs, usec_rem, rw->map_id, | |
197 | (unsigned long long)rw->phys, | |
736ca61f | 198 | rw->value, rw->pc, 0); |
bd8ac686 PP |
199 | break; |
200 | case MMIO_UNKNOWN_OP: | |
201 | ret = trace_seq_printf(s, | |
dee310d0 PP |
202 | "UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n", |
203 | secs, usec_rem, rw->map_id, | |
204 | (unsigned long long)rw->phys, | |
bd8ac686 | 205 | (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff, |
736ca61f | 206 | (rw->value >> 0) & 0xff, rw->pc, 0); |
bd8ac686 PP |
207 | break; |
208 | default: | |
209 | ret = trace_seq_printf(s, "rw what?\n"); | |
210 | break; | |
211 | } | |
212 | if (ret) | |
07f4e4f7 FW |
213 | return TRACE_TYPE_HANDLED; |
214 | return TRACE_TYPE_PARTIAL_LINE; | |
bd8ac686 PP |
215 | } |
216 | ||
07f4e4f7 | 217 | static enum print_line_t mmio_print_map(struct trace_iterator *iter) |
bd8ac686 PP |
218 | { |
219 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
220 | struct trace_mmiotrace_map *field; |
221 | struct mmiotrace_map *m; | |
bd8ac686 | 222 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 223 | unsigned long long t = ns2usecs(iter->ts); |
bd8ac686 PP |
224 | unsigned long usec_rem = do_div(t, 1000000ULL); |
225 | unsigned secs = (unsigned long)t; | |
07f4e4f7 | 226 | int ret; |
bd8ac686 | 227 | |
7104f300 SR |
228 | trace_assign_type(field, entry); |
229 | m = &field->map; | |
230 | ||
777e208d | 231 | switch (m->opcode) { |
bd8ac686 PP |
232 | case MMIO_PROBE: |
233 | ret = trace_seq_printf(s, | |
dee310d0 PP |
234 | "MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
235 | secs, usec_rem, m->map_id, | |
236 | (unsigned long long)m->phys, m->virt, m->len, | |
e0fd5c2f | 237 | 0UL, 0); |
bd8ac686 PP |
238 | break; |
239 | case MMIO_UNPROBE: | |
240 | ret = trace_seq_printf(s, | |
241 | "UNMAP %lu.%06lu %d 0x%lx %d\n", | |
e0fd5c2f | 242 | secs, usec_rem, m->map_id, 0UL, 0); |
bd8ac686 PP |
243 | break; |
244 | default: | |
245 | ret = trace_seq_printf(s, "map what?\n"); | |
246 | break; | |
247 | } | |
248 | if (ret) | |
07f4e4f7 FW |
249 | return TRACE_TYPE_HANDLED; |
250 | return TRACE_TYPE_PARTIAL_LINE; | |
bd8ac686 PP |
251 | } |
252 | ||
07f4e4f7 | 253 | static enum print_line_t mmio_print_mark(struct trace_iterator *iter) |
fc5e27ae PP |
254 | { |
255 | struct trace_entry *entry = iter->ent; | |
777e208d SR |
256 | struct print_entry *print = (struct print_entry *)entry; |
257 | const char *msg = print->buf; | |
fc5e27ae | 258 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 259 | unsigned long long t = ns2usecs(iter->ts); |
fc5e27ae PP |
260 | unsigned long usec_rem = do_div(t, 1000000ULL); |
261 | unsigned secs = (unsigned long)t; | |
262 | int ret; | |
263 | ||
264 | /* The trailing newline must be in the message. */ | |
265 | ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg); | |
266 | if (!ret) | |
07f4e4f7 | 267 | return TRACE_TYPE_PARTIAL_LINE; |
fc5e27ae | 268 | |
777e208d | 269 | if (entry->flags & TRACE_FLAG_CONT) |
fc5e27ae PP |
270 | trace_seq_print_cont(s, iter); |
271 | ||
07f4e4f7 | 272 | return TRACE_TYPE_HANDLED; |
fc5e27ae PP |
273 | } |
274 | ||
07f4e4f7 | 275 | static enum print_line_t mmio_print_line(struct trace_iterator *iter) |
bd8ac686 PP |
276 | { |
277 | switch (iter->ent->type) { | |
278 | case TRACE_MMIO_RW: | |
279 | return mmio_print_rw(iter); | |
280 | case TRACE_MMIO_MAP: | |
281 | return mmio_print_map(iter); | |
fc5e27ae PP |
282 | case TRACE_PRINT: |
283 | return mmio_print_mark(iter); | |
bd8ac686 | 284 | default: |
07f4e4f7 | 285 | return TRACE_TYPE_HANDLED; /* ignore unknown entries */ |
bd8ac686 | 286 | } |
f984b51e PP |
287 | } |
288 | ||
289 | static struct tracer mmio_tracer __read_mostly = | |
290 | { | |
291 | .name = "mmiotrace", | |
292 | .init = mmio_trace_init, | |
293 | .reset = mmio_trace_reset, | |
bbf5b1a0 | 294 | .start = mmio_trace_start, |
d0a7e8ca PP |
295 | .pipe_open = mmio_pipe_open, |
296 | .close = mmio_close, | |
297 | .read = mmio_read, | |
bd8ac686 | 298 | .print_line = mmio_print_line, |
f984b51e PP |
299 | }; |
300 | ||
301 | __init static int init_mmio_trace(void) | |
302 | { | |
f984b51e PP |
303 | return register_tracer(&mmio_tracer); |
304 | } | |
305 | device_initcall(init_mmio_trace); | |
306 | ||
45dcd8b8 PP |
307 | static void __trace_mmiotrace_rw(struct trace_array *tr, |
308 | struct trace_array_cpu *data, | |
309 | struct mmiotrace_rw *rw) | |
310 | { | |
3928a8a2 | 311 | struct ring_buffer_event *event; |
777e208d | 312 | struct trace_mmiotrace_rw *entry; |
45dcd8b8 PP |
313 | unsigned long irq_flags; |
314 | ||
3928a8a2 SR |
315 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
316 | &irq_flags); | |
317 | if (!event) | |
318 | return; | |
319 | entry = ring_buffer_event_data(event); | |
38697053 | 320 | tracing_generic_entry_update(&entry->ent, 0, preempt_count()); |
777e208d SR |
321 | entry->ent.type = TRACE_MMIO_RW; |
322 | entry->rw = *rw; | |
3928a8a2 | 323 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
324 | |
325 | trace_wake_up(); | |
326 | } | |
327 | ||
bd8ac686 | 328 | void mmio_trace_rw(struct mmiotrace_rw *rw) |
f984b51e PP |
329 | { |
330 | struct trace_array *tr = mmio_trace_array; | |
331 | struct trace_array_cpu *data = tr->data[smp_processor_id()]; | |
bd8ac686 PP |
332 | __trace_mmiotrace_rw(tr, data, rw); |
333 | } | |
f984b51e | 334 | |
45dcd8b8 PP |
335 | static void __trace_mmiotrace_map(struct trace_array *tr, |
336 | struct trace_array_cpu *data, | |
337 | struct mmiotrace_map *map) | |
338 | { | |
3928a8a2 | 339 | struct ring_buffer_event *event; |
777e208d | 340 | struct trace_mmiotrace_map *entry; |
45dcd8b8 PP |
341 | unsigned long irq_flags; |
342 | ||
3928a8a2 SR |
343 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
344 | &irq_flags); | |
345 | if (!event) | |
346 | return; | |
347 | entry = ring_buffer_event_data(event); | |
38697053 | 348 | tracing_generic_entry_update(&entry->ent, 0, preempt_count()); |
777e208d SR |
349 | entry->ent.type = TRACE_MMIO_MAP; |
350 | entry->map = *map; | |
3928a8a2 | 351 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
352 | |
353 | trace_wake_up(); | |
354 | } | |
355 | ||
bd8ac686 PP |
356 | void mmio_trace_mapping(struct mmiotrace_map *map) |
357 | { | |
358 | struct trace_array *tr = mmio_trace_array; | |
359 | struct trace_array_cpu *data; | |
360 | ||
361 | preempt_disable(); | |
362 | data = tr->data[smp_processor_id()]; | |
363 | __trace_mmiotrace_map(tr, data, map); | |
364 | preempt_enable(); | |
f984b51e | 365 | } |
9e57fb35 PP |
366 | |
367 | int mmio_trace_printk(const char *fmt, va_list args) | |
368 | { | |
369 | return trace_vprintk(0, fmt, args); | |
370 | } |