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> |
173ed24e | 12 | #include <asm/atomic.h> |
f984b51e PP |
13 | |
14 | #include "trace.h" | |
f0868d1e | 15 | #include "trace_output.h" |
f984b51e | 16 | |
d0a7e8ca PP |
17 | struct header_iter { |
18 | struct pci_dev *dev; | |
19 | }; | |
20 | ||
f984b51e | 21 | static struct trace_array *mmio_trace_array; |
2039238b | 22 | static bool overrun_detected; |
7ee1768d | 23 | static unsigned long prev_overruns; |
173ed24e | 24 | static atomic_t dropped_count; |
f984b51e | 25 | |
bd8ac686 PP |
26 | static void mmio_reset_data(struct trace_array *tr) |
27 | { | |
2039238b | 28 | overrun_detected = false; |
7ee1768d | 29 | prev_overruns = 0; |
bd8ac686 | 30 | |
213cc060 | 31 | tracing_reset_online_cpus(tr); |
bd8ac686 | 32 | } |
f984b51e | 33 | |
1c80025a | 34 | static int mmio_trace_init(struct trace_array *tr) |
f984b51e PP |
35 | { |
36 | pr_debug("in %s\n", __func__); | |
37 | mmio_trace_array = tr; | |
c76f0694 SR |
38 | |
39 | mmio_reset_data(tr); | |
40 | enable_mmiotrace(); | |
1c80025a | 41 | return 0; |
f984b51e PP |
42 | } |
43 | ||
44 | static void mmio_trace_reset(struct trace_array *tr) | |
45 | { | |
46 | pr_debug("in %s\n", __func__); | |
c76f0694 SR |
47 | |
48 | disable_mmiotrace(); | |
bd8ac686 PP |
49 | mmio_reset_data(tr); |
50 | mmio_trace_array = NULL; | |
f984b51e PP |
51 | } |
52 | ||
bbf5b1a0 | 53 | static void mmio_trace_start(struct trace_array *tr) |
f984b51e PP |
54 | { |
55 | pr_debug("in %s\n", __func__); | |
bbf5b1a0 | 56 | mmio_reset_data(tr); |
bd8ac686 PP |
57 | } |
58 | ||
13829537 PP |
59 | static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
60 | { | |
61 | int ret = 0; | |
62 | int i; | |
63 | resource_size_t start, end; | |
64 | const struct pci_driver *drv = pci_dev_driver(dev); | |
65 | ||
66 | /* XXX: incomplete checks for trace_seq_printf() return value */ | |
67 | ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", | |
68 | dev->bus->number, dev->devfn, | |
69 | dev->vendor, dev->device, dev->irq); | |
70 | /* | |
71 | * XXX: is pci_resource_to_user() appropriate, since we are | |
72 | * supposed to interpret the __ioremap() phys_addr argument based on | |
73 | * these printed values? | |
74 | */ | |
75 | for (i = 0; i < 7; i++) { | |
76 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
77 | ret += trace_seq_printf(s, " %llx", | |
78 | (unsigned long long)(start | | |
79 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
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 | dev->resource[i].start < dev->resource[i].end ? | |
85 | (unsigned long long)(end - start) + 1 : 0); | |
86 | } | |
87 | if (drv) | |
88 | ret += trace_seq_printf(s, " %s\n", drv->name); | |
89 | else | |
90 | ret += trace_seq_printf(s, " \n"); | |
91 | return ret; | |
92 | } | |
93 | ||
d0a7e8ca PP |
94 | static void destroy_header_iter(struct header_iter *hiter) |
95 | { | |
96 | if (!hiter) | |
97 | return; | |
98 | pci_dev_put(hiter->dev); | |
99 | kfree(hiter); | |
100 | } | |
101 | ||
102 | static void mmio_pipe_open(struct trace_iterator *iter) | |
bd8ac686 | 103 | { |
d0a7e8ca | 104 | struct header_iter *hiter; |
bd8ac686 | 105 | struct trace_seq *s = &iter->seq; |
13829537 PP |
106 | |
107 | trace_seq_printf(s, "VERSION 20070824\n"); | |
108 | ||
d0a7e8ca PP |
109 | hiter = kzalloc(sizeof(*hiter), GFP_KERNEL); |
110 | if (!hiter) | |
111 | return; | |
112 | ||
113 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
114 | iter->private = hiter; | |
115 | } | |
116 | ||
117 | /* XXX: This is not called when the pipe is closed! */ | |
118 | static void mmio_close(struct trace_iterator *iter) | |
119 | { | |
120 | struct header_iter *hiter = iter->private; | |
121 | destroy_header_iter(hiter); | |
122 | iter->private = NULL; | |
123 | } | |
124 | ||
2039238b PP |
125 | static unsigned long count_overruns(struct trace_iterator *iter) |
126 | { | |
173ed24e | 127 | unsigned long cnt = atomic_xchg(&dropped_count, 0); |
7ee1768d PP |
128 | unsigned long over = ring_buffer_overruns(iter->tr->buffer); |
129 | ||
130 | if (over > prev_overruns) | |
173ed24e | 131 | cnt += over - prev_overruns; |
7ee1768d | 132 | prev_overruns = over; |
2039238b PP |
133 | return cnt; |
134 | } | |
135 | ||
d0a7e8ca PP |
136 | static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, |
137 | char __user *ubuf, size_t cnt, loff_t *ppos) | |
138 | { | |
139 | ssize_t ret; | |
140 | struct header_iter *hiter = iter->private; | |
141 | struct trace_seq *s = &iter->seq; | |
2039238b PP |
142 | unsigned long n; |
143 | ||
144 | n = count_overruns(iter); | |
145 | if (n) { | |
146 | /* XXX: This is later than where events were lost. */ | |
147 | trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n); | |
148 | if (!overrun_detected) | |
149 | pr_warning("mmiotrace has lost events.\n"); | |
150 | overrun_detected = true; | |
151 | goto print_out; | |
152 | } | |
d0a7e8ca PP |
153 | |
154 | if (!hiter) | |
155 | return 0; | |
156 | ||
157 | mmio_print_pcidev(s, hiter->dev); | |
158 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev); | |
159 | ||
160 | if (!hiter->dev) { | |
161 | destroy_header_iter(hiter); | |
162 | iter->private = NULL; | |
163 | } | |
164 | ||
2039238b | 165 | print_out: |
d0a7e8ca PP |
166 | ret = trace_seq_to_user(s, ubuf, cnt); |
167 | return (ret == -EBUSY) ? 0 : ret; | |
bd8ac686 PP |
168 | } |
169 | ||
07f4e4f7 | 170 | static enum print_line_t mmio_print_rw(struct trace_iterator *iter) |
bd8ac686 PP |
171 | { |
172 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
173 | struct trace_mmiotrace_rw *field; |
174 | struct mmiotrace_rw *rw; | |
bd8ac686 | 175 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 176 | unsigned long long t = ns2usecs(iter->ts); |
bd8ac686 PP |
177 | unsigned long usec_rem = do_div(t, 1000000ULL); |
178 | unsigned secs = (unsigned long)t; | |
179 | int ret = 1; | |
180 | ||
7104f300 SR |
181 | trace_assign_type(field, entry); |
182 | rw = &field->rw; | |
183 | ||
777e208d | 184 | switch (rw->opcode) { |
bd8ac686 PP |
185 | case MMIO_READ: |
186 | ret = trace_seq_printf(s, | |
5e4abc98 | 187 | "R %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
188 | rw->width, secs, usec_rem, rw->map_id, |
189 | (unsigned long long)rw->phys, | |
736ca61f | 190 | rw->value, rw->pc, 0); |
bd8ac686 PP |
191 | break; |
192 | case MMIO_WRITE: | |
193 | ret = trace_seq_printf(s, | |
5e4abc98 | 194 | "W %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
195 | rw->width, secs, usec_rem, rw->map_id, |
196 | (unsigned long long)rw->phys, | |
736ca61f | 197 | rw->value, rw->pc, 0); |
bd8ac686 PP |
198 | break; |
199 | case MMIO_UNKNOWN_OP: | |
200 | ret = trace_seq_printf(s, | |
5e4abc98 SR |
201 | "UNKNOWN %u.%06lu %d 0x%llx %02lx,%02lx," |
202 | "%02lx 0x%lx %d\n", | |
dee310d0 PP |
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, | |
5e4abc98 | 234 | "MAP %u.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
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, | |
5e4abc98 | 241 | "UNMAP %u.%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. */ | |
5e4abc98 | 265 | ret = trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg); |
fc5e27ae | 266 | if (!ret) |
07f4e4f7 | 267 | return TRACE_TYPE_PARTIAL_LINE; |
fc5e27ae | 268 | |
07f4e4f7 | 269 | return TRACE_TYPE_HANDLED; |
fc5e27ae PP |
270 | } |
271 | ||
07f4e4f7 | 272 | static enum print_line_t mmio_print_line(struct trace_iterator *iter) |
bd8ac686 PP |
273 | { |
274 | switch (iter->ent->type) { | |
275 | case TRACE_MMIO_RW: | |
276 | return mmio_print_rw(iter); | |
277 | case TRACE_MMIO_MAP: | |
278 | return mmio_print_map(iter); | |
fc5e27ae PP |
279 | case TRACE_PRINT: |
280 | return mmio_print_mark(iter); | |
bd8ac686 | 281 | default: |
07f4e4f7 | 282 | return TRACE_TYPE_HANDLED; /* ignore unknown entries */ |
bd8ac686 | 283 | } |
f984b51e PP |
284 | } |
285 | ||
286 | static struct tracer mmio_tracer __read_mostly = | |
287 | { | |
288 | .name = "mmiotrace", | |
289 | .init = mmio_trace_init, | |
290 | .reset = mmio_trace_reset, | |
bbf5b1a0 | 291 | .start = mmio_trace_start, |
d0a7e8ca PP |
292 | .pipe_open = mmio_pipe_open, |
293 | .close = mmio_close, | |
294 | .read = mmio_read, | |
bd8ac686 | 295 | .print_line = mmio_print_line, |
f984b51e PP |
296 | }; |
297 | ||
298 | __init static int init_mmio_trace(void) | |
299 | { | |
f984b51e PP |
300 | return register_tracer(&mmio_tracer); |
301 | } | |
302 | device_initcall(init_mmio_trace); | |
303 | ||
45dcd8b8 PP |
304 | static void __trace_mmiotrace_rw(struct trace_array *tr, |
305 | struct trace_array_cpu *data, | |
306 | struct mmiotrace_rw *rw) | |
307 | { | |
3928a8a2 | 308 | struct ring_buffer_event *event; |
777e208d | 309 | struct trace_mmiotrace_rw *entry; |
45dcd8b8 PP |
310 | unsigned long irq_flags; |
311 | ||
3928a8a2 SR |
312 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
313 | &irq_flags); | |
173ed24e PP |
314 | if (!event) { |
315 | atomic_inc(&dropped_count); | |
3928a8a2 | 316 | return; |
173ed24e | 317 | } |
3928a8a2 | 318 | entry = ring_buffer_event_data(event); |
38697053 | 319 | tracing_generic_entry_update(&entry->ent, 0, preempt_count()); |
777e208d SR |
320 | entry->ent.type = TRACE_MMIO_RW; |
321 | entry->rw = *rw; | |
3928a8a2 | 322 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
323 | |
324 | trace_wake_up(); | |
325 | } | |
326 | ||
bd8ac686 | 327 | void mmio_trace_rw(struct mmiotrace_rw *rw) |
f984b51e PP |
328 | { |
329 | struct trace_array *tr = mmio_trace_array; | |
330 | struct trace_array_cpu *data = tr->data[smp_processor_id()]; | |
bd8ac686 PP |
331 | __trace_mmiotrace_rw(tr, data, rw); |
332 | } | |
f984b51e | 333 | |
45dcd8b8 PP |
334 | static void __trace_mmiotrace_map(struct trace_array *tr, |
335 | struct trace_array_cpu *data, | |
336 | struct mmiotrace_map *map) | |
337 | { | |
3928a8a2 | 338 | struct ring_buffer_event *event; |
777e208d | 339 | struct trace_mmiotrace_map *entry; |
45dcd8b8 PP |
340 | unsigned long irq_flags; |
341 | ||
3928a8a2 SR |
342 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
343 | &irq_flags); | |
173ed24e PP |
344 | if (!event) { |
345 | atomic_inc(&dropped_count); | |
3928a8a2 | 346 | return; |
173ed24e | 347 | } |
3928a8a2 | 348 | entry = ring_buffer_event_data(event); |
38697053 | 349 | tracing_generic_entry_update(&entry->ent, 0, preempt_count()); |
777e208d SR |
350 | entry->ent.type = TRACE_MMIO_MAP; |
351 | entry->map = *map; | |
3928a8a2 | 352 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
353 | |
354 | trace_wake_up(); | |
355 | } | |
356 | ||
bd8ac686 PP |
357 | void mmio_trace_mapping(struct mmiotrace_map *map) |
358 | { | |
359 | struct trace_array *tr = mmio_trace_array; | |
360 | struct trace_array_cpu *data; | |
361 | ||
362 | preempt_disable(); | |
363 | data = tr->data[smp_processor_id()]; | |
364 | __trace_mmiotrace_map(tr, data, map); | |
365 | preempt_enable(); | |
f984b51e | 366 | } |
9e57fb35 PP |
367 | |
368 | int mmio_trace_printk(const char *fmt, va_list args) | |
369 | { | |
1fd8f2a3 | 370 | return trace_vprintk(0, -1, fmt, args); |
9e57fb35 | 371 | } |