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> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
a5dec557 LZ |
13 | #include <linux/time.h> |
14 | ||
60063497 | 15 | #include <linux/atomic.h> |
f984b51e PP |
16 | |
17 | #include "trace.h" | |
f0868d1e | 18 | #include "trace_output.h" |
f984b51e | 19 | |
d0a7e8ca PP |
20 | struct header_iter { |
21 | struct pci_dev *dev; | |
22 | }; | |
23 | ||
f984b51e | 24 | static struct trace_array *mmio_trace_array; |
2039238b | 25 | static bool overrun_detected; |
7ee1768d | 26 | static unsigned long prev_overruns; |
173ed24e | 27 | static atomic_t dropped_count; |
f984b51e | 28 | |
bd8ac686 PP |
29 | static void mmio_reset_data(struct trace_array *tr) |
30 | { | |
2039238b | 31 | overrun_detected = false; |
7ee1768d | 32 | prev_overruns = 0; |
bd8ac686 | 33 | |
213cc060 | 34 | tracing_reset_online_cpus(tr); |
bd8ac686 | 35 | } |
f984b51e | 36 | |
1c80025a | 37 | static int mmio_trace_init(struct trace_array *tr) |
f984b51e PP |
38 | { |
39 | pr_debug("in %s\n", __func__); | |
40 | mmio_trace_array = tr; | |
c76f0694 SR |
41 | |
42 | mmio_reset_data(tr); | |
43 | enable_mmiotrace(); | |
1c80025a | 44 | return 0; |
f984b51e PP |
45 | } |
46 | ||
47 | static void mmio_trace_reset(struct trace_array *tr) | |
48 | { | |
49 | pr_debug("in %s\n", __func__); | |
c76f0694 SR |
50 | |
51 | disable_mmiotrace(); | |
bd8ac686 PP |
52 | mmio_reset_data(tr); |
53 | mmio_trace_array = NULL; | |
f984b51e PP |
54 | } |
55 | ||
bbf5b1a0 | 56 | static void mmio_trace_start(struct trace_array *tr) |
f984b51e PP |
57 | { |
58 | pr_debug("in %s\n", __func__); | |
bbf5b1a0 | 59 | mmio_reset_data(tr); |
bd8ac686 PP |
60 | } |
61 | ||
13829537 PP |
62 | static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
63 | { | |
64 | int ret = 0; | |
65 | int i; | |
66 | resource_size_t start, end; | |
67 | const struct pci_driver *drv = pci_dev_driver(dev); | |
68 | ||
69 | /* XXX: incomplete checks for trace_seq_printf() return value */ | |
70 | ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", | |
71 | dev->bus->number, dev->devfn, | |
72 | dev->vendor, dev->device, dev->irq); | |
73 | /* | |
74 | * XXX: is pci_resource_to_user() appropriate, since we are | |
75 | * supposed to interpret the __ioremap() phys_addr argument based on | |
76 | * these printed values? | |
77 | */ | |
78 | for (i = 0; i < 7; i++) { | |
79 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
80 | ret += trace_seq_printf(s, " %llx", | |
81 | (unsigned long long)(start | | |
82 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
83 | } | |
84 | for (i = 0; i < 7; i++) { | |
85 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
86 | ret += trace_seq_printf(s, " %llx", | |
87 | dev->resource[i].start < dev->resource[i].end ? | |
88 | (unsigned long long)(end - start) + 1 : 0); | |
89 | } | |
90 | if (drv) | |
91 | ret += trace_seq_printf(s, " %s\n", drv->name); | |
92 | else | |
93 | ret += trace_seq_printf(s, " \n"); | |
94 | return ret; | |
95 | } | |
96 | ||
d0a7e8ca PP |
97 | static void destroy_header_iter(struct header_iter *hiter) |
98 | { | |
99 | if (!hiter) | |
100 | return; | |
101 | pci_dev_put(hiter->dev); | |
102 | kfree(hiter); | |
103 | } | |
104 | ||
105 | static void mmio_pipe_open(struct trace_iterator *iter) | |
bd8ac686 | 106 | { |
d0a7e8ca | 107 | struct header_iter *hiter; |
bd8ac686 | 108 | struct trace_seq *s = &iter->seq; |
13829537 PP |
109 | |
110 | trace_seq_printf(s, "VERSION 20070824\n"); | |
111 | ||
d0a7e8ca PP |
112 | hiter = kzalloc(sizeof(*hiter), GFP_KERNEL); |
113 | if (!hiter) | |
114 | return; | |
115 | ||
116 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
117 | iter->private = hiter; | |
118 | } | |
119 | ||
120 | /* XXX: This is not called when the pipe is closed! */ | |
121 | static void mmio_close(struct trace_iterator *iter) | |
122 | { | |
123 | struct header_iter *hiter = iter->private; | |
124 | destroy_header_iter(hiter); | |
125 | iter->private = NULL; | |
126 | } | |
127 | ||
2039238b PP |
128 | static unsigned long count_overruns(struct trace_iterator *iter) |
129 | { | |
173ed24e | 130 | unsigned long cnt = atomic_xchg(&dropped_count, 0); |
7ee1768d PP |
131 | unsigned long over = ring_buffer_overruns(iter->tr->buffer); |
132 | ||
133 | if (over > prev_overruns) | |
173ed24e | 134 | cnt += over - prev_overruns; |
7ee1768d | 135 | prev_overruns = over; |
2039238b PP |
136 | return cnt; |
137 | } | |
138 | ||
d0a7e8ca PP |
139 | static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, |
140 | char __user *ubuf, size_t cnt, loff_t *ppos) | |
141 | { | |
142 | ssize_t ret; | |
143 | struct header_iter *hiter = iter->private; | |
144 | struct trace_seq *s = &iter->seq; | |
2039238b PP |
145 | unsigned long n; |
146 | ||
147 | n = count_overruns(iter); | |
148 | if (n) { | |
149 | /* XXX: This is later than where events were lost. */ | |
150 | trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n); | |
151 | if (!overrun_detected) | |
152 | pr_warning("mmiotrace has lost events.\n"); | |
153 | overrun_detected = true; | |
154 | goto print_out; | |
155 | } | |
d0a7e8ca PP |
156 | |
157 | if (!hiter) | |
158 | return 0; | |
159 | ||
160 | mmio_print_pcidev(s, hiter->dev); | |
161 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev); | |
162 | ||
163 | if (!hiter->dev) { | |
164 | destroy_header_iter(hiter); | |
165 | iter->private = NULL; | |
166 | } | |
167 | ||
2039238b | 168 | print_out: |
d0a7e8ca PP |
169 | ret = trace_seq_to_user(s, ubuf, cnt); |
170 | return (ret == -EBUSY) ? 0 : ret; | |
bd8ac686 PP |
171 | } |
172 | ||
07f4e4f7 | 173 | static enum print_line_t mmio_print_rw(struct trace_iterator *iter) |
bd8ac686 PP |
174 | { |
175 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
176 | struct trace_mmiotrace_rw *field; |
177 | struct mmiotrace_rw *rw; | |
bd8ac686 | 178 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 179 | unsigned long long t = ns2usecs(iter->ts); |
a5dec557 | 180 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
bd8ac686 PP |
181 | unsigned secs = (unsigned long)t; |
182 | int ret = 1; | |
183 | ||
7104f300 SR |
184 | trace_assign_type(field, entry); |
185 | rw = &field->rw; | |
186 | ||
777e208d | 187 | switch (rw->opcode) { |
bd8ac686 PP |
188 | case MMIO_READ: |
189 | ret = trace_seq_printf(s, | |
5e4abc98 | 190 | "R %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
191 | rw->width, secs, usec_rem, rw->map_id, |
192 | (unsigned long long)rw->phys, | |
736ca61f | 193 | rw->value, rw->pc, 0); |
bd8ac686 PP |
194 | break; |
195 | case MMIO_WRITE: | |
196 | ret = trace_seq_printf(s, | |
5e4abc98 | 197 | "W %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
198 | rw->width, secs, usec_rem, rw->map_id, |
199 | (unsigned long long)rw->phys, | |
736ca61f | 200 | rw->value, rw->pc, 0); |
bd8ac686 PP |
201 | break; |
202 | case MMIO_UNKNOWN_OP: | |
203 | ret = trace_seq_printf(s, | |
5e4abc98 SR |
204 | "UNKNOWN %u.%06lu %d 0x%llx %02lx,%02lx," |
205 | "%02lx 0x%lx %d\n", | |
dee310d0 PP |
206 | secs, usec_rem, rw->map_id, |
207 | (unsigned long long)rw->phys, | |
bd8ac686 | 208 | (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff, |
736ca61f | 209 | (rw->value >> 0) & 0xff, rw->pc, 0); |
bd8ac686 PP |
210 | break; |
211 | default: | |
212 | ret = trace_seq_printf(s, "rw what?\n"); | |
213 | break; | |
214 | } | |
215 | if (ret) | |
07f4e4f7 FW |
216 | return TRACE_TYPE_HANDLED; |
217 | return TRACE_TYPE_PARTIAL_LINE; | |
bd8ac686 PP |
218 | } |
219 | ||
07f4e4f7 | 220 | static enum print_line_t mmio_print_map(struct trace_iterator *iter) |
bd8ac686 PP |
221 | { |
222 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
223 | struct trace_mmiotrace_map *field; |
224 | struct mmiotrace_map *m; | |
bd8ac686 | 225 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 226 | unsigned long long t = ns2usecs(iter->ts); |
a5dec557 | 227 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
bd8ac686 | 228 | unsigned secs = (unsigned long)t; |
07f4e4f7 | 229 | int ret; |
bd8ac686 | 230 | |
7104f300 SR |
231 | trace_assign_type(field, entry); |
232 | m = &field->map; | |
233 | ||
777e208d | 234 | switch (m->opcode) { |
bd8ac686 PP |
235 | case MMIO_PROBE: |
236 | ret = trace_seq_printf(s, | |
5e4abc98 | 237 | "MAP %u.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
238 | secs, usec_rem, m->map_id, |
239 | (unsigned long long)m->phys, m->virt, m->len, | |
e0fd5c2f | 240 | 0UL, 0); |
bd8ac686 PP |
241 | break; |
242 | case MMIO_UNPROBE: | |
243 | ret = trace_seq_printf(s, | |
5e4abc98 | 244 | "UNMAP %u.%06lu %d 0x%lx %d\n", |
e0fd5c2f | 245 | secs, usec_rem, m->map_id, 0UL, 0); |
bd8ac686 PP |
246 | break; |
247 | default: | |
248 | ret = trace_seq_printf(s, "map what?\n"); | |
249 | break; | |
250 | } | |
251 | if (ret) | |
07f4e4f7 FW |
252 | return TRACE_TYPE_HANDLED; |
253 | return TRACE_TYPE_PARTIAL_LINE; | |
bd8ac686 PP |
254 | } |
255 | ||
07f4e4f7 | 256 | static enum print_line_t mmio_print_mark(struct trace_iterator *iter) |
fc5e27ae PP |
257 | { |
258 | struct trace_entry *entry = iter->ent; | |
777e208d | 259 | struct print_entry *print = (struct print_entry *)entry; |
48ead020 | 260 | const char *msg = print->buf; |
fc5e27ae | 261 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 262 | unsigned long long t = ns2usecs(iter->ts); |
769b0441 | 263 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
fc5e27ae PP |
264 | unsigned secs = (unsigned long)t; |
265 | int ret; | |
266 | ||
267 | /* The trailing newline must be in the message. */ | |
48ead020 | 268 | ret = trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg); |
fc5e27ae | 269 | if (!ret) |
07f4e4f7 | 270 | return TRACE_TYPE_PARTIAL_LINE; |
fc5e27ae | 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 | { | |
60ba7702 | 311 | struct ftrace_event_call *call = &event_mmiotrace_rw; |
e77405ad | 312 | struct ring_buffer *buffer = tr->buffer; |
3928a8a2 | 313 | struct ring_buffer_event *event; |
777e208d | 314 | struct trace_mmiotrace_rw *entry; |
51a763dd | 315 | int pc = preempt_count(); |
45dcd8b8 | 316 | |
e77405ad | 317 | event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_RW, |
51a763dd | 318 | sizeof(*entry), 0, pc); |
173ed24e PP |
319 | if (!event) { |
320 | atomic_inc(&dropped_count); | |
3928a8a2 | 321 | return; |
173ed24e | 322 | } |
3928a8a2 | 323 | entry = ring_buffer_event_data(event); |
777e208d | 324 | entry->rw = *rw; |
60ba7702 SR |
325 | |
326 | if (!filter_check_discard(call, entry, buffer, event)) | |
327 | trace_buffer_unlock_commit(buffer, event, 0, pc); | |
45dcd8b8 PP |
328 | } |
329 | ||
bd8ac686 | 330 | void mmio_trace_rw(struct mmiotrace_rw *rw) |
f984b51e PP |
331 | { |
332 | struct trace_array *tr = mmio_trace_array; | |
333 | struct trace_array_cpu *data = tr->data[smp_processor_id()]; | |
bd8ac686 PP |
334 | __trace_mmiotrace_rw(tr, data, rw); |
335 | } | |
f984b51e | 336 | |
45dcd8b8 PP |
337 | static void __trace_mmiotrace_map(struct trace_array *tr, |
338 | struct trace_array_cpu *data, | |
339 | struct mmiotrace_map *map) | |
340 | { | |
60ba7702 | 341 | struct ftrace_event_call *call = &event_mmiotrace_map; |
e77405ad | 342 | struct ring_buffer *buffer = tr->buffer; |
3928a8a2 | 343 | struct ring_buffer_event *event; |
777e208d | 344 | struct trace_mmiotrace_map *entry; |
51a763dd | 345 | int pc = preempt_count(); |
45dcd8b8 | 346 | |
e77405ad | 347 | event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_MAP, |
51a763dd | 348 | sizeof(*entry), 0, pc); |
173ed24e PP |
349 | if (!event) { |
350 | atomic_inc(&dropped_count); | |
3928a8a2 | 351 | return; |
173ed24e | 352 | } |
3928a8a2 | 353 | entry = ring_buffer_event_data(event); |
777e208d | 354 | entry->map = *map; |
60ba7702 SR |
355 | |
356 | if (!filter_check_discard(call, entry, buffer, event)) | |
357 | trace_buffer_unlock_commit(buffer, event, 0, pc); | |
45dcd8b8 PP |
358 | } |
359 | ||
bd8ac686 PP |
360 | void mmio_trace_mapping(struct mmiotrace_map *map) |
361 | { | |
362 | struct trace_array *tr = mmio_trace_array; | |
363 | struct trace_array_cpu *data; | |
364 | ||
365 | preempt_disable(); | |
366 | data = tr->data[smp_processor_id()]; | |
367 | __trace_mmiotrace_map(tr, data, map); | |
368 | preempt_enable(); | |
f984b51e | 369 | } |
9e57fb35 PP |
370 | |
371 | int mmio_trace_printk(const char *fmt, va_list args) | |
372 | { | |
40ce74f1 | 373 | return trace_vprintk(0, fmt, args); |
9e57fb35 | 374 | } |