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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; |
f984b51e | 21 | |
bd8ac686 PP |
22 | static void mmio_reset_data(struct trace_array *tr) |
23 | { | |
24 | int cpu; | |
25 | ||
2039238b | 26 | overrun_detected = false; |
bd8ac686 PP |
27 | tr->time_start = ftrace_now(tr->cpu); |
28 | ||
29 | for_each_online_cpu(cpu) | |
3928a8a2 | 30 | tracing_reset(tr, cpu); |
bd8ac686 | 31 | } |
f984b51e PP |
32 | |
33 | static void mmio_trace_init(struct trace_array *tr) | |
34 | { | |
35 | pr_debug("in %s\n", __func__); | |
36 | mmio_trace_array = tr; | |
bd8ac686 PP |
37 | if (tr->ctrl) { |
38 | mmio_reset_data(tr); | |
f984b51e | 39 | enable_mmiotrace(); |
bd8ac686 | 40 | } |
f984b51e PP |
41 | } |
42 | ||
43 | static void mmio_trace_reset(struct trace_array *tr) | |
44 | { | |
45 | pr_debug("in %s\n", __func__); | |
46 | if (tr->ctrl) | |
47 | disable_mmiotrace(); | |
bd8ac686 PP |
48 | mmio_reset_data(tr); |
49 | mmio_trace_array = NULL; | |
f984b51e PP |
50 | } |
51 | ||
bbf5b1a0 | 52 | static void mmio_trace_start(struct trace_array *tr) |
f984b51e PP |
53 | { |
54 | pr_debug("in %s\n", __func__); | |
bbf5b1a0 | 55 | mmio_reset_data(tr); |
bd8ac686 PP |
56 | } |
57 | ||
13829537 PP |
58 | static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
59 | { | |
60 | int ret = 0; | |
61 | int i; | |
62 | resource_size_t start, end; | |
63 | const struct pci_driver *drv = pci_dev_driver(dev); | |
64 | ||
65 | /* XXX: incomplete checks for trace_seq_printf() return value */ | |
66 | ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", | |
67 | dev->bus->number, dev->devfn, | |
68 | dev->vendor, dev->device, dev->irq); | |
69 | /* | |
70 | * XXX: is pci_resource_to_user() appropriate, since we are | |
71 | * supposed to interpret the __ioremap() phys_addr argument based on | |
72 | * these printed values? | |
73 | */ | |
74 | for (i = 0; i < 7; i++) { | |
75 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
76 | ret += trace_seq_printf(s, " %llx", | |
77 | (unsigned long long)(start | | |
78 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
79 | } | |
80 | for (i = 0; i < 7; i++) { | |
81 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
82 | ret += trace_seq_printf(s, " %llx", | |
83 | dev->resource[i].start < dev->resource[i].end ? | |
84 | (unsigned long long)(end - start) + 1 : 0); | |
85 | } | |
86 | if (drv) | |
87 | ret += trace_seq_printf(s, " %s\n", drv->name); | |
88 | else | |
89 | ret += trace_seq_printf(s, " \n"); | |
90 | return ret; | |
91 | } | |
92 | ||
d0a7e8ca PP |
93 | static void destroy_header_iter(struct header_iter *hiter) |
94 | { | |
95 | if (!hiter) | |
96 | return; | |
97 | pci_dev_put(hiter->dev); | |
98 | kfree(hiter); | |
99 | } | |
100 | ||
101 | static void mmio_pipe_open(struct trace_iterator *iter) | |
bd8ac686 | 102 | { |
d0a7e8ca | 103 | struct header_iter *hiter; |
bd8ac686 | 104 | struct trace_seq *s = &iter->seq; |
13829537 PP |
105 | |
106 | trace_seq_printf(s, "VERSION 20070824\n"); | |
107 | ||
d0a7e8ca PP |
108 | hiter = kzalloc(sizeof(*hiter), GFP_KERNEL); |
109 | if (!hiter) | |
110 | return; | |
111 | ||
112 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
113 | iter->private = hiter; | |
114 | } | |
115 | ||
116 | /* XXX: This is not called when the pipe is closed! */ | |
117 | static void mmio_close(struct trace_iterator *iter) | |
118 | { | |
119 | struct header_iter *hiter = iter->private; | |
120 | destroy_header_iter(hiter); | |
121 | iter->private = NULL; | |
122 | } | |
123 | ||
2039238b PP |
124 | static unsigned long count_overruns(struct trace_iterator *iter) |
125 | { | |
126 | int cpu; | |
127 | unsigned long cnt = 0; | |
3928a8a2 SR |
128 | /* FIXME: */ |
129 | #if 0 | |
2039238b PP |
130 | for_each_online_cpu(cpu) { |
131 | cnt += iter->overrun[cpu]; | |
132 | iter->overrun[cpu] = 0; | |
133 | } | |
3928a8a2 SR |
134 | #endif |
135 | (void)cpu; | |
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); |
bd8ac686 PP |
180 | unsigned long usec_rem = do_div(t, 1000000ULL); |
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, | |
dee310d0 PP |
190 | "R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
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, | |
dee310d0 PP |
197 | "W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
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, | |
dee310d0 PP |
204 | "UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n", |
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); |
bd8ac686 PP |
226 | unsigned long usec_rem = do_div(t, 1000000ULL); |
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, | |
dee310d0 PP |
236 | "MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
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, | |
243 | "UNMAP %lu.%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 SR |
258 | struct print_entry *print = (struct print_entry *)entry; |
259 | const char *msg = print->buf; | |
fc5e27ae | 260 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 261 | unsigned long long t = ns2usecs(iter->ts); |
fc5e27ae PP |
262 | unsigned long usec_rem = do_div(t, 1000000ULL); |
263 | unsigned secs = (unsigned long)t; | |
264 | int ret; | |
265 | ||
266 | /* The trailing newline must be in the message. */ | |
267 | ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg); | |
268 | if (!ret) | |
07f4e4f7 | 269 | return TRACE_TYPE_PARTIAL_LINE; |
fc5e27ae | 270 | |
777e208d | 271 | if (entry->flags & TRACE_FLAG_CONT) |
fc5e27ae PP |
272 | trace_seq_print_cont(s, iter); |
273 | ||
07f4e4f7 | 274 | return TRACE_TYPE_HANDLED; |
fc5e27ae PP |
275 | } |
276 | ||
07f4e4f7 | 277 | static enum print_line_t mmio_print_line(struct trace_iterator *iter) |
bd8ac686 PP |
278 | { |
279 | switch (iter->ent->type) { | |
280 | case TRACE_MMIO_RW: | |
281 | return mmio_print_rw(iter); | |
282 | case TRACE_MMIO_MAP: | |
283 | return mmio_print_map(iter); | |
fc5e27ae PP |
284 | case TRACE_PRINT: |
285 | return mmio_print_mark(iter); | |
bd8ac686 | 286 | default: |
07f4e4f7 | 287 | return TRACE_TYPE_HANDLED; /* ignore unknown entries */ |
bd8ac686 | 288 | } |
f984b51e PP |
289 | } |
290 | ||
291 | static struct tracer mmio_tracer __read_mostly = | |
292 | { | |
293 | .name = "mmiotrace", | |
294 | .init = mmio_trace_init, | |
295 | .reset = mmio_trace_reset, | |
bbf5b1a0 | 296 | .start = mmio_trace_start, |
d0a7e8ca PP |
297 | .pipe_open = mmio_pipe_open, |
298 | .close = mmio_close, | |
299 | .read = mmio_read, | |
bd8ac686 | 300 | .print_line = mmio_print_line, |
f984b51e PP |
301 | }; |
302 | ||
303 | __init static int init_mmio_trace(void) | |
304 | { | |
f984b51e PP |
305 | return register_tracer(&mmio_tracer); |
306 | } | |
307 | device_initcall(init_mmio_trace); | |
308 | ||
45dcd8b8 PP |
309 | static void __trace_mmiotrace_rw(struct trace_array *tr, |
310 | struct trace_array_cpu *data, | |
311 | struct mmiotrace_rw *rw) | |
312 | { | |
3928a8a2 | 313 | struct ring_buffer_event *event; |
777e208d | 314 | struct trace_mmiotrace_rw *entry; |
45dcd8b8 PP |
315 | unsigned long irq_flags; |
316 | ||
3928a8a2 SR |
317 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
318 | &irq_flags); | |
319 | if (!event) | |
320 | return; | |
321 | entry = ring_buffer_event_data(event); | |
38697053 | 322 | tracing_generic_entry_update(&entry->ent, 0, preempt_count()); |
777e208d SR |
323 | entry->ent.type = TRACE_MMIO_RW; |
324 | entry->rw = *rw; | |
3928a8a2 | 325 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
326 | |
327 | trace_wake_up(); | |
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 | { | |
3928a8a2 | 341 | struct ring_buffer_event *event; |
777e208d | 342 | struct trace_mmiotrace_map *entry; |
45dcd8b8 PP |
343 | unsigned long irq_flags; |
344 | ||
3928a8a2 SR |
345 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
346 | &irq_flags); | |
347 | if (!event) | |
348 | return; | |
349 | entry = ring_buffer_event_data(event); | |
38697053 | 350 | tracing_generic_entry_update(&entry->ent, 0, preempt_count()); |
777e208d SR |
351 | entry->ent.type = TRACE_MMIO_MAP; |
352 | entry->map = *map; | |
3928a8a2 | 353 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
354 | |
355 | trace_wake_up(); | |
356 | } | |
357 | ||
bd8ac686 PP |
358 | void mmio_trace_mapping(struct mmiotrace_map *map) |
359 | { | |
360 | struct trace_array *tr = mmio_trace_array; | |
361 | struct trace_array_cpu *data; | |
362 | ||
363 | preempt_disable(); | |
364 | data = tr->data[smp_processor_id()]; | |
365 | __trace_mmiotrace_map(tr, data, map); | |
366 | preempt_enable(); | |
f984b51e | 367 | } |
9e57fb35 PP |
368 | |
369 | int mmio_trace_printk(const char *fmt, va_list args) | |
370 | { | |
371 | return trace_vprintk(0, fmt, args); | |
372 | } |