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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 | ||
52 | static void mmio_trace_ctrl_update(struct trace_array *tr) | |
53 | { | |
54 | pr_debug("in %s\n", __func__); | |
bd8ac686 PP |
55 | if (tr->ctrl) { |
56 | mmio_reset_data(tr); | |
f984b51e | 57 | enable_mmiotrace(); |
bd8ac686 | 58 | } else { |
f984b51e | 59 | disable_mmiotrace(); |
bd8ac686 PP |
60 | } |
61 | } | |
62 | ||
13829537 PP |
63 | static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
64 | { | |
65 | int ret = 0; | |
66 | int i; | |
67 | resource_size_t start, end; | |
68 | const struct pci_driver *drv = pci_dev_driver(dev); | |
69 | ||
70 | /* XXX: incomplete checks for trace_seq_printf() return value */ | |
71 | ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", | |
72 | dev->bus->number, dev->devfn, | |
73 | dev->vendor, dev->device, dev->irq); | |
74 | /* | |
75 | * XXX: is pci_resource_to_user() appropriate, since we are | |
76 | * supposed to interpret the __ioremap() phys_addr argument based on | |
77 | * these printed values? | |
78 | */ | |
79 | for (i = 0; i < 7; i++) { | |
80 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
81 | ret += trace_seq_printf(s, " %llx", | |
82 | (unsigned long long)(start | | |
83 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
84 | } | |
85 | for (i = 0; i < 7; i++) { | |
86 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
87 | ret += trace_seq_printf(s, " %llx", | |
88 | dev->resource[i].start < dev->resource[i].end ? | |
89 | (unsigned long long)(end - start) + 1 : 0); | |
90 | } | |
91 | if (drv) | |
92 | ret += trace_seq_printf(s, " %s\n", drv->name); | |
93 | else | |
94 | ret += trace_seq_printf(s, " \n"); | |
95 | return ret; | |
96 | } | |
97 | ||
d0a7e8ca PP |
98 | static void destroy_header_iter(struct header_iter *hiter) |
99 | { | |
100 | if (!hiter) | |
101 | return; | |
102 | pci_dev_put(hiter->dev); | |
103 | kfree(hiter); | |
104 | } | |
105 | ||
106 | static void mmio_pipe_open(struct trace_iterator *iter) | |
bd8ac686 | 107 | { |
d0a7e8ca | 108 | struct header_iter *hiter; |
bd8ac686 | 109 | struct trace_seq *s = &iter->seq; |
13829537 PP |
110 | |
111 | trace_seq_printf(s, "VERSION 20070824\n"); | |
112 | ||
d0a7e8ca PP |
113 | hiter = kzalloc(sizeof(*hiter), GFP_KERNEL); |
114 | if (!hiter) | |
115 | return; | |
116 | ||
117 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
118 | iter->private = hiter; | |
119 | } | |
120 | ||
121 | /* XXX: This is not called when the pipe is closed! */ | |
122 | static void mmio_close(struct trace_iterator *iter) | |
123 | { | |
124 | struct header_iter *hiter = iter->private; | |
125 | destroy_header_iter(hiter); | |
126 | iter->private = NULL; | |
127 | } | |
128 | ||
2039238b PP |
129 | static unsigned long count_overruns(struct trace_iterator *iter) |
130 | { | |
131 | int cpu; | |
132 | unsigned long cnt = 0; | |
3928a8a2 SR |
133 | /* FIXME: */ |
134 | #if 0 | |
2039238b PP |
135 | for_each_online_cpu(cpu) { |
136 | cnt += iter->overrun[cpu]; | |
137 | iter->overrun[cpu] = 0; | |
138 | } | |
3928a8a2 SR |
139 | #endif |
140 | (void)cpu; | |
2039238b PP |
141 | return cnt; |
142 | } | |
143 | ||
d0a7e8ca PP |
144 | static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, |
145 | char __user *ubuf, size_t cnt, loff_t *ppos) | |
146 | { | |
147 | ssize_t ret; | |
148 | struct header_iter *hiter = iter->private; | |
149 | struct trace_seq *s = &iter->seq; | |
2039238b PP |
150 | unsigned long n; |
151 | ||
152 | n = count_overruns(iter); | |
153 | if (n) { | |
154 | /* XXX: This is later than where events were lost. */ | |
155 | trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n); | |
156 | if (!overrun_detected) | |
157 | pr_warning("mmiotrace has lost events.\n"); | |
158 | overrun_detected = true; | |
159 | goto print_out; | |
160 | } | |
d0a7e8ca PP |
161 | |
162 | if (!hiter) | |
163 | return 0; | |
164 | ||
165 | mmio_print_pcidev(s, hiter->dev); | |
166 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev); | |
167 | ||
168 | if (!hiter->dev) { | |
169 | destroy_header_iter(hiter); | |
170 | iter->private = NULL; | |
171 | } | |
172 | ||
2039238b | 173 | print_out: |
d0a7e8ca PP |
174 | ret = trace_seq_to_user(s, ubuf, cnt); |
175 | return (ret == -EBUSY) ? 0 : ret; | |
bd8ac686 PP |
176 | } |
177 | ||
178 | static int mmio_print_rw(struct trace_iterator *iter) | |
179 | { | |
180 | struct trace_entry *entry = iter->ent; | |
2e2ca155 | 181 | struct mmiotrace_rw *rw = &entry->field.mmiorw; |
bd8ac686 | 182 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 183 | unsigned long long t = ns2usecs(iter->ts); |
bd8ac686 PP |
184 | unsigned long usec_rem = do_div(t, 1000000ULL); |
185 | unsigned secs = (unsigned long)t; | |
186 | int ret = 1; | |
187 | ||
2e2ca155 | 188 | switch (entry->field.mmiorw.opcode) { |
bd8ac686 PP |
189 | case MMIO_READ: |
190 | ret = trace_seq_printf(s, | |
dee310d0 PP |
191 | "R %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_WRITE: | |
197 | ret = trace_seq_printf(s, | |
dee310d0 PP |
198 | "W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
199 | rw->width, secs, usec_rem, rw->map_id, | |
200 | (unsigned long long)rw->phys, | |
736ca61f | 201 | rw->value, rw->pc, 0); |
bd8ac686 PP |
202 | break; |
203 | case MMIO_UNKNOWN_OP: | |
204 | ret = trace_seq_printf(s, | |
dee310d0 PP |
205 | "UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n", |
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) | |
216 | return 1; | |
217 | return 0; | |
218 | } | |
219 | ||
220 | static int mmio_print_map(struct trace_iterator *iter) | |
221 | { | |
222 | struct trace_entry *entry = iter->ent; | |
2e2ca155 | 223 | struct mmiotrace_map *m = &entry->field.mmiomap; |
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; | |
228 | int ret = 1; | |
229 | ||
2e2ca155 | 230 | switch (entry->field.mmiorw.opcode) { |
bd8ac686 PP |
231 | case MMIO_PROBE: |
232 | ret = trace_seq_printf(s, | |
dee310d0 PP |
233 | "MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
234 | secs, usec_rem, m->map_id, | |
235 | (unsigned long long)m->phys, m->virt, m->len, | |
e0fd5c2f | 236 | 0UL, 0); |
bd8ac686 PP |
237 | break; |
238 | case MMIO_UNPROBE: | |
239 | ret = trace_seq_printf(s, | |
240 | "UNMAP %lu.%06lu %d 0x%lx %d\n", | |
e0fd5c2f | 241 | secs, usec_rem, m->map_id, 0UL, 0); |
bd8ac686 PP |
242 | break; |
243 | default: | |
244 | ret = trace_seq_printf(s, "map what?\n"); | |
245 | break; | |
246 | } | |
247 | if (ret) | |
248 | return 1; | |
249 | return 0; | |
250 | } | |
251 | ||
fc5e27ae PP |
252 | static int mmio_print_mark(struct trace_iterator *iter) |
253 | { | |
254 | struct trace_entry *entry = iter->ent; | |
255 | const char *msg = entry->field.print.buf; | |
256 | struct trace_seq *s = &iter->seq; | |
3928a8a2 | 257 | unsigned long long t = ns2usecs(iter->ts); |
fc5e27ae PP |
258 | unsigned long usec_rem = do_div(t, 1000000ULL); |
259 | unsigned secs = (unsigned long)t; | |
260 | int ret; | |
261 | ||
262 | /* The trailing newline must be in the message. */ | |
263 | ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg); | |
264 | if (!ret) | |
265 | return 0; | |
266 | ||
267 | if (entry->field.flags & TRACE_FLAG_CONT) | |
268 | trace_seq_print_cont(s, iter); | |
269 | ||
270 | return 1; | |
271 | } | |
272 | ||
bd8ac686 PP |
273 | /* return 0 to abort printing without consuming current entry in pipe mode */ |
274 | static int mmio_print_line(struct trace_iterator *iter) | |
275 | { | |
276 | switch (iter->ent->type) { | |
277 | case TRACE_MMIO_RW: | |
278 | return mmio_print_rw(iter); | |
279 | case TRACE_MMIO_MAP: | |
280 | return mmio_print_map(iter); | |
fc5e27ae PP |
281 | case TRACE_PRINT: |
282 | return mmio_print_mark(iter); | |
bd8ac686 PP |
283 | default: |
284 | return 1; /* ignore unknown entries */ | |
285 | } | |
f984b51e PP |
286 | } |
287 | ||
288 | static struct tracer mmio_tracer __read_mostly = | |
289 | { | |
290 | .name = "mmiotrace", | |
291 | .init = mmio_trace_init, | |
292 | .reset = mmio_trace_reset, | |
d0a7e8ca PP |
293 | .pipe_open = mmio_pipe_open, |
294 | .close = mmio_close, | |
295 | .read = mmio_read, | |
f984b51e | 296 | .ctrl_update = mmio_trace_ctrl_update, |
bd8ac686 | 297 | .print_line = mmio_print_line, |
f984b51e PP |
298 | }; |
299 | ||
300 | __init static int init_mmio_trace(void) | |
301 | { | |
f984b51e PP |
302 | return register_tracer(&mmio_tracer); |
303 | } | |
304 | device_initcall(init_mmio_trace); | |
305 | ||
45dcd8b8 PP |
306 | static void __trace_mmiotrace_rw(struct trace_array *tr, |
307 | struct trace_array_cpu *data, | |
308 | struct mmiotrace_rw *rw) | |
309 | { | |
3928a8a2 | 310 | struct ring_buffer_event *event; |
45dcd8b8 PP |
311 | struct trace_entry *entry; |
312 | unsigned long irq_flags; | |
313 | ||
3928a8a2 SR |
314 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
315 | &irq_flags); | |
316 | if (!event) | |
317 | return; | |
318 | entry = ring_buffer_event_data(event); | |
45dcd8b8 PP |
319 | tracing_generic_entry_update(entry, 0); |
320 | entry->type = TRACE_MMIO_RW; | |
321 | entry->field.mmiorw = *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; |
45dcd8b8 PP |
339 | struct trace_entry *entry; |
340 | unsigned long irq_flags; | |
341 | ||
3928a8a2 SR |
342 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
343 | &irq_flags); | |
344 | if (!event) | |
345 | return; | |
346 | entry = ring_buffer_event_data(event); | |
45dcd8b8 PP |
347 | tracing_generic_entry_update(entry, 0); |
348 | entry->type = TRACE_MMIO_MAP; | |
349 | entry->field.mmiomap = *map; | |
3928a8a2 | 350 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
45dcd8b8 PP |
351 | |
352 | trace_wake_up(); | |
353 | } | |
354 | ||
bd8ac686 PP |
355 | void mmio_trace_mapping(struct mmiotrace_map *map) |
356 | { | |
357 | struct trace_array *tr = mmio_trace_array; | |
358 | struct trace_array_cpu *data; | |
359 | ||
360 | preempt_disable(); | |
361 | data = tr->data[smp_processor_id()]; | |
362 | __trace_mmiotrace_map(tr, data, map); | |
363 | preempt_enable(); | |
f984b51e | 364 | } |
9e57fb35 PP |
365 | |
366 | int mmio_trace_printk(const char *fmt, va_list args) | |
367 | { | |
368 | return trace_vprintk(0, fmt, args); | |
369 | } |