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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> |
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 | { | |
2039238b | 25 | overrun_detected = false; |
7ee1768d | 26 | prev_overruns = 0; |
bd8ac686 | 27 | |
213cc060 | 28 | tracing_reset_online_cpus(tr); |
bd8ac686 | 29 | } |
f984b51e | 30 | |
1c80025a | 31 | static int mmio_trace_init(struct trace_array *tr) |
f984b51e PP |
32 | { |
33 | pr_debug("in %s\n", __func__); | |
34 | mmio_trace_array = tr; | |
c76f0694 SR |
35 | |
36 | mmio_reset_data(tr); | |
37 | enable_mmiotrace(); | |
1c80025a | 38 | return 0; |
f984b51e PP |
39 | } |
40 | ||
41 | static void mmio_trace_reset(struct trace_array *tr) | |
42 | { | |
43 | pr_debug("in %s\n", __func__); | |
c76f0694 SR |
44 | |
45 | disable_mmiotrace(); | |
bd8ac686 PP |
46 | mmio_reset_data(tr); |
47 | mmio_trace_array = NULL; | |
f984b51e PP |
48 | } |
49 | ||
bbf5b1a0 | 50 | static void mmio_trace_start(struct trace_array *tr) |
f984b51e PP |
51 | { |
52 | pr_debug("in %s\n", __func__); | |
bbf5b1a0 | 53 | mmio_reset_data(tr); |
bd8ac686 PP |
54 | } |
55 | ||
13829537 PP |
56 | static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
57 | { | |
58 | int ret = 0; | |
59 | int i; | |
60 | resource_size_t start, end; | |
61 | const struct pci_driver *drv = pci_dev_driver(dev); | |
62 | ||
63 | /* XXX: incomplete checks for trace_seq_printf() return value */ | |
64 | ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", | |
65 | dev->bus->number, dev->devfn, | |
66 | dev->vendor, dev->device, dev->irq); | |
67 | /* | |
68 | * XXX: is pci_resource_to_user() appropriate, since we are | |
69 | * supposed to interpret the __ioremap() phys_addr argument based on | |
70 | * these printed values? | |
71 | */ | |
72 | for (i = 0; i < 7; i++) { | |
73 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
74 | ret += trace_seq_printf(s, " %llx", | |
75 | (unsigned long long)(start | | |
76 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
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 | dev->resource[i].start < dev->resource[i].end ? | |
82 | (unsigned long long)(end - start) + 1 : 0); | |
83 | } | |
84 | if (drv) | |
85 | ret += trace_seq_printf(s, " %s\n", drv->name); | |
86 | else | |
87 | ret += trace_seq_printf(s, " \n"); | |
88 | return ret; | |
89 | } | |
90 | ||
d0a7e8ca PP |
91 | static void destroy_header_iter(struct header_iter *hiter) |
92 | { | |
93 | if (!hiter) | |
94 | return; | |
95 | pci_dev_put(hiter->dev); | |
96 | kfree(hiter); | |
97 | } | |
98 | ||
99 | static void mmio_pipe_open(struct trace_iterator *iter) | |
bd8ac686 | 100 | { |
d0a7e8ca | 101 | struct header_iter *hiter; |
bd8ac686 | 102 | struct trace_seq *s = &iter->seq; |
13829537 PP |
103 | |
104 | trace_seq_printf(s, "VERSION 20070824\n"); | |
105 | ||
d0a7e8ca PP |
106 | hiter = kzalloc(sizeof(*hiter), GFP_KERNEL); |
107 | if (!hiter) | |
108 | return; | |
109 | ||
110 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
111 | iter->private = hiter; | |
112 | } | |
113 | ||
114 | /* XXX: This is not called when the pipe is closed! */ | |
115 | static void mmio_close(struct trace_iterator *iter) | |
116 | { | |
117 | struct header_iter *hiter = iter->private; | |
118 | destroy_header_iter(hiter); | |
119 | iter->private = NULL; | |
120 | } | |
121 | ||
2039238b PP |
122 | static unsigned long count_overruns(struct trace_iterator *iter) |
123 | { | |
2039238b | 124 | unsigned long cnt = 0; |
7ee1768d PP |
125 | unsigned long over = ring_buffer_overruns(iter->tr->buffer); |
126 | ||
127 | if (over > prev_overruns) | |
128 | cnt = over - prev_overruns; | |
129 | prev_overruns = over; | |
2039238b PP |
130 | return cnt; |
131 | } | |
132 | ||
d0a7e8ca PP |
133 | static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, |
134 | char __user *ubuf, size_t cnt, loff_t *ppos) | |
135 | { | |
136 | ssize_t ret; | |
137 | struct header_iter *hiter = iter->private; | |
138 | struct trace_seq *s = &iter->seq; | |
2039238b PP |
139 | unsigned long n; |
140 | ||
141 | n = count_overruns(iter); | |
142 | if (n) { | |
143 | /* XXX: This is later than where events were lost. */ | |
144 | trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n); | |
145 | if (!overrun_detected) | |
146 | pr_warning("mmiotrace has lost events.\n"); | |
147 | overrun_detected = true; | |
148 | goto print_out; | |
149 | } | |
d0a7e8ca PP |
150 | |
151 | if (!hiter) | |
152 | return 0; | |
153 | ||
154 | mmio_print_pcidev(s, hiter->dev); | |
155 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev); | |
156 | ||
157 | if (!hiter->dev) { | |
158 | destroy_header_iter(hiter); | |
159 | iter->private = NULL; | |
160 | } | |
161 | ||
2039238b | 162 | print_out: |
d0a7e8ca PP |
163 | ret = trace_seq_to_user(s, ubuf, cnt); |
164 | return (ret == -EBUSY) ? 0 : ret; | |
bd8ac686 PP |
165 | } |
166 | ||
07f4e4f7 | 167 | static enum print_line_t mmio_print_rw(struct trace_iterator *iter) |
bd8ac686 PP |
168 | { |
169 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
170 | struct trace_mmiotrace_rw *field; |
171 | struct mmiotrace_rw *rw; | |
bd8ac686 | 172 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 173 | unsigned long long t = ns2usecs(iter->ts); |
bd8ac686 PP |
174 | unsigned long usec_rem = do_div(t, 1000000ULL); |
175 | unsigned secs = (unsigned long)t; | |
176 | int ret = 1; | |
177 | ||
7104f300 SR |
178 | trace_assign_type(field, entry); |
179 | rw = &field->rw; | |
180 | ||
777e208d | 181 | switch (rw->opcode) { |
bd8ac686 PP |
182 | case MMIO_READ: |
183 | ret = trace_seq_printf(s, | |
dee310d0 PP |
184 | "R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
185 | rw->width, secs, usec_rem, rw->map_id, | |
186 | (unsigned long long)rw->phys, | |
736ca61f | 187 | rw->value, rw->pc, 0); |
bd8ac686 PP |
188 | break; |
189 | case MMIO_WRITE: | |
190 | ret = trace_seq_printf(s, | |
dee310d0 PP |
191 | "W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
192 | rw->width, secs, usec_rem, rw->map_id, | |
193 | (unsigned long long)rw->phys, | |
736ca61f | 194 | rw->value, rw->pc, 0); |
bd8ac686 PP |
195 | break; |
196 | case MMIO_UNKNOWN_OP: | |
197 | ret = trace_seq_printf(s, | |
dee310d0 PP |
198 | "UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n", |
199 | secs, usec_rem, rw->map_id, | |
200 | (unsigned long long)rw->phys, | |
bd8ac686 | 201 | (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff, |
736ca61f | 202 | (rw->value >> 0) & 0xff, rw->pc, 0); |
bd8ac686 PP |
203 | break; |
204 | default: | |
205 | ret = trace_seq_printf(s, "rw what?\n"); | |
206 | break; | |
207 | } | |
208 | if (ret) | |
07f4e4f7 FW |
209 | return TRACE_TYPE_HANDLED; |
210 | return TRACE_TYPE_PARTIAL_LINE; | |
bd8ac686 PP |
211 | } |
212 | ||
07f4e4f7 | 213 | static enum print_line_t mmio_print_map(struct trace_iterator *iter) |
bd8ac686 PP |
214 | { |
215 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
216 | struct trace_mmiotrace_map *field; |
217 | struct mmiotrace_map *m; | |
bd8ac686 | 218 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 219 | unsigned long long t = ns2usecs(iter->ts); |
bd8ac686 PP |
220 | unsigned long usec_rem = do_div(t, 1000000ULL); |
221 | unsigned secs = (unsigned long)t; | |
07f4e4f7 | 222 | int ret; |
bd8ac686 | 223 | |
7104f300 SR |
224 | trace_assign_type(field, entry); |
225 | m = &field->map; | |
226 | ||
777e208d | 227 | switch (m->opcode) { |
bd8ac686 PP |
228 | case MMIO_PROBE: |
229 | ret = trace_seq_printf(s, | |
dee310d0 PP |
230 | "MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
231 | secs, usec_rem, m->map_id, | |
232 | (unsigned long long)m->phys, m->virt, m->len, | |
e0fd5c2f | 233 | 0UL, 0); |
bd8ac686 PP |
234 | break; |
235 | case MMIO_UNPROBE: | |
236 | ret = trace_seq_printf(s, | |
237 | "UNMAP %lu.%06lu %d 0x%lx %d\n", | |
e0fd5c2f | 238 | secs, usec_rem, m->map_id, 0UL, 0); |
bd8ac686 PP |
239 | break; |
240 | default: | |
241 | ret = trace_seq_printf(s, "map what?\n"); | |
242 | break; | |
243 | } | |
244 | if (ret) | |
07f4e4f7 FW |
245 | return TRACE_TYPE_HANDLED; |
246 | return TRACE_TYPE_PARTIAL_LINE; | |
bd8ac686 PP |
247 | } |
248 | ||
07f4e4f7 | 249 | static enum print_line_t mmio_print_mark(struct trace_iterator *iter) |
fc5e27ae PP |
250 | { |
251 | struct trace_entry *entry = iter->ent; | |
777e208d SR |
252 | struct print_entry *print = (struct print_entry *)entry; |
253 | const char *msg = print->buf; | |
fc5e27ae | 254 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 255 | unsigned long long t = ns2usecs(iter->ts); |
fc5e27ae PP |
256 | unsigned long usec_rem = do_div(t, 1000000ULL); |
257 | unsigned secs = (unsigned long)t; | |
258 | int ret; | |
259 | ||
260 | /* The trailing newline must be in the message. */ | |
261 | ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg); | |
262 | if (!ret) | |
07f4e4f7 | 263 | return TRACE_TYPE_PARTIAL_LINE; |
fc5e27ae | 264 | |
777e208d | 265 | if (entry->flags & TRACE_FLAG_CONT) |
fc5e27ae PP |
266 | trace_seq_print_cont(s, iter); |
267 | ||
07f4e4f7 | 268 | return TRACE_TYPE_HANDLED; |
fc5e27ae PP |
269 | } |
270 | ||
07f4e4f7 | 271 | static enum print_line_t mmio_print_line(struct trace_iterator *iter) |
bd8ac686 PP |
272 | { |
273 | switch (iter->ent->type) { | |
274 | case TRACE_MMIO_RW: | |
275 | return mmio_print_rw(iter); | |
276 | case TRACE_MMIO_MAP: | |
277 | return mmio_print_map(iter); | |
fc5e27ae PP |
278 | case TRACE_PRINT: |
279 | return mmio_print_mark(iter); | |
bd8ac686 | 280 | default: |
07f4e4f7 | 281 | return TRACE_TYPE_HANDLED; /* ignore unknown entries */ |
bd8ac686 | 282 | } |
f984b51e PP |
283 | } |
284 | ||
285 | static struct tracer mmio_tracer __read_mostly = | |
286 | { | |
287 | .name = "mmiotrace", | |
288 | .init = mmio_trace_init, | |
289 | .reset = mmio_trace_reset, | |
bbf5b1a0 | 290 | .start = mmio_trace_start, |
d0a7e8ca PP |
291 | .pipe_open = mmio_pipe_open, |
292 | .close = mmio_close, | |
293 | .read = mmio_read, | |
bd8ac686 | 294 | .print_line = mmio_print_line, |
f984b51e PP |
295 | }; |
296 | ||
297 | __init static int init_mmio_trace(void) | |
298 | { | |
f984b51e PP |
299 | return register_tracer(&mmio_tracer); |
300 | } | |
301 | device_initcall(init_mmio_trace); | |
302 | ||
45dcd8b8 PP |
303 | static void __trace_mmiotrace_rw(struct trace_array *tr, |
304 | struct trace_array_cpu *data, | |
305 | struct mmiotrace_rw *rw) | |
306 | { | |
3928a8a2 | 307 | struct ring_buffer_event *event; |
777e208d | 308 | struct trace_mmiotrace_rw *entry; |
45dcd8b8 PP |
309 | unsigned long irq_flags; |
310 | ||
3928a8a2 SR |
311 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
312 | &irq_flags); | |
313 | if (!event) | |
314 | return; | |
315 | entry = ring_buffer_event_data(event); | |
38697053 | 316 | tracing_generic_entry_update(&entry->ent, 0, preempt_count()); |
777e208d SR |
317 | entry->ent.type = TRACE_MMIO_RW; |
318 | entry->rw = *rw; | |
3928a8a2 | 319 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
320 | |
321 | trace_wake_up(); | |
322 | } | |
323 | ||
bd8ac686 | 324 | void mmio_trace_rw(struct mmiotrace_rw *rw) |
f984b51e PP |
325 | { |
326 | struct trace_array *tr = mmio_trace_array; | |
327 | struct trace_array_cpu *data = tr->data[smp_processor_id()]; | |
bd8ac686 PP |
328 | __trace_mmiotrace_rw(tr, data, rw); |
329 | } | |
f984b51e | 330 | |
45dcd8b8 PP |
331 | static void __trace_mmiotrace_map(struct trace_array *tr, |
332 | struct trace_array_cpu *data, | |
333 | struct mmiotrace_map *map) | |
334 | { | |
3928a8a2 | 335 | struct ring_buffer_event *event; |
777e208d | 336 | struct trace_mmiotrace_map *entry; |
45dcd8b8 PP |
337 | unsigned long irq_flags; |
338 | ||
3928a8a2 SR |
339 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
340 | &irq_flags); | |
341 | if (!event) | |
342 | return; | |
343 | entry = ring_buffer_event_data(event); | |
38697053 | 344 | tracing_generic_entry_update(&entry->ent, 0, preempt_count()); |
777e208d SR |
345 | entry->ent.type = TRACE_MMIO_MAP; |
346 | entry->map = *map; | |
3928a8a2 | 347 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
348 | |
349 | trace_wake_up(); | |
350 | } | |
351 | ||
bd8ac686 PP |
352 | void mmio_trace_mapping(struct mmiotrace_map *map) |
353 | { | |
354 | struct trace_array *tr = mmio_trace_array; | |
355 | struct trace_array_cpu *data; | |
356 | ||
357 | preempt_disable(); | |
358 | data = tr->data[smp_processor_id()]; | |
359 | __trace_mmiotrace_map(tr, data, map); | |
360 | preempt_enable(); | |
f984b51e | 361 | } |
9e57fb35 PP |
362 | |
363 | int mmio_trace_printk(const char *fmt, va_list args) | |
364 | { | |
1fd8f2a3 | 365 | return trace_vprintk(0, -1, fmt, args); |
9e57fb35 | 366 | } |