Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f984b51e PP |
2 | /* |
3 | * Memory mapped I/O tracing | |
4 | * | |
5 | * Copyright (C) 2008 Pekka Paalanen <pq@iki.fi> | |
6 | */ | |
7 | ||
f984b51e PP |
8 | #include <linux/kernel.h> |
9 | #include <linux/mmiotrace.h> | |
13829537 | 10 | #include <linux/pci.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
a5dec557 LZ |
12 | #include <linux/time.h> |
13 | ||
60063497 | 14 | #include <linux/atomic.h> |
f984b51e PP |
15 | |
16 | #include "trace.h" | |
f0868d1e | 17 | #include "trace_output.h" |
f984b51e | 18 | |
d0a7e8ca PP |
19 | struct header_iter { |
20 | struct pci_dev *dev; | |
21 | }; | |
22 | ||
f984b51e | 23 | static struct trace_array *mmio_trace_array; |
2039238b | 24 | static bool overrun_detected; |
7ee1768d | 25 | static unsigned long prev_overruns; |
173ed24e | 26 | static atomic_t dropped_count; |
f984b51e | 27 | |
bd8ac686 PP |
28 | static void mmio_reset_data(struct trace_array *tr) |
29 | { | |
2039238b | 30 | overrun_detected = false; |
7ee1768d | 31 | prev_overruns = 0; |
bd8ac686 | 32 | |
1c5eb448 | 33 | tracing_reset_online_cpus(&tr->array_buffer); |
bd8ac686 | 34 | } |
f984b51e | 35 | |
1c80025a | 36 | static int mmio_trace_init(struct trace_array *tr) |
f984b51e PP |
37 | { |
38 | pr_debug("in %s\n", __func__); | |
39 | mmio_trace_array = tr; | |
c76f0694 SR |
40 | |
41 | mmio_reset_data(tr); | |
42 | enable_mmiotrace(); | |
1c80025a | 43 | return 0; |
f984b51e PP |
44 | } |
45 | ||
46 | static void mmio_trace_reset(struct trace_array *tr) | |
47 | { | |
48 | pr_debug("in %s\n", __func__); | |
c76f0694 SR |
49 | |
50 | disable_mmiotrace(); | |
bd8ac686 PP |
51 | mmio_reset_data(tr); |
52 | mmio_trace_array = NULL; | |
f984b51e PP |
53 | } |
54 | ||
bbf5b1a0 | 55 | static void mmio_trace_start(struct trace_array *tr) |
f984b51e PP |
56 | { |
57 | pr_debug("in %s\n", __func__); | |
bbf5b1a0 | 58 | mmio_reset_data(tr); |
bd8ac686 PP |
59 | } |
60 | ||
a72e10af | 61 | static void mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
13829537 | 62 | { |
13829537 PP |
63 | int i; |
64 | resource_size_t start, end; | |
65 | const struct pci_driver *drv = pci_dev_driver(dev); | |
66 | ||
a72e10af SRRH |
67 | trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", |
68 | dev->bus->number, dev->devfn, | |
69 | dev->vendor, dev->device, dev->irq); | |
13829537 | 70 | for (i = 0; i < 7; i++) { |
9a51933e | 71 | start = dev->resource[i].start; |
a72e10af | 72 | trace_seq_printf(s, " %llx", |
13829537 PP |
73 | (unsigned long long)(start | |
74 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
75 | } | |
76 | for (i = 0; i < 7; i++) { | |
9a51933e BH |
77 | start = dev->resource[i].start; |
78 | end = dev->resource[i].end; | |
a72e10af | 79 | trace_seq_printf(s, " %llx", |
13829537 PP |
80 | dev->resource[i].start < dev->resource[i].end ? |
81 | (unsigned long long)(end - start) + 1 : 0); | |
82 | } | |
83 | if (drv) | |
a72e10af | 84 | trace_seq_printf(s, " %s\n", drv->name); |
13829537 | 85 | else |
a72e10af | 86 | trace_seq_puts(s, " \n"); |
13829537 PP |
87 | } |
88 | ||
d0a7e8ca PP |
89 | static void destroy_header_iter(struct header_iter *hiter) |
90 | { | |
91 | if (!hiter) | |
92 | return; | |
93 | pci_dev_put(hiter->dev); | |
94 | kfree(hiter); | |
95 | } | |
96 | ||
97 | static void mmio_pipe_open(struct trace_iterator *iter) | |
bd8ac686 | 98 | { |
d0a7e8ca | 99 | struct header_iter *hiter; |
bd8ac686 | 100 | struct trace_seq *s = &iter->seq; |
13829537 | 101 | |
146c3442 | 102 | trace_seq_puts(s, "VERSION 20070824\n"); |
13829537 | 103 | |
d0a7e8ca PP |
104 | hiter = kzalloc(sizeof(*hiter), GFP_KERNEL); |
105 | if (!hiter) | |
106 | return; | |
107 | ||
108 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
109 | iter->private = hiter; | |
110 | } | |
111 | ||
112 | /* XXX: This is not called when the pipe is closed! */ | |
113 | static void mmio_close(struct trace_iterator *iter) | |
114 | { | |
115 | struct header_iter *hiter = iter->private; | |
116 | destroy_header_iter(hiter); | |
117 | iter->private = NULL; | |
118 | } | |
119 | ||
2039238b PP |
120 | static unsigned long count_overruns(struct trace_iterator *iter) |
121 | { | |
173ed24e | 122 | unsigned long cnt = atomic_xchg(&dropped_count, 0); |
1c5eb448 | 123 | unsigned long over = ring_buffer_overruns(iter->array_buffer->buffer); |
7ee1768d PP |
124 | |
125 | if (over > prev_overruns) | |
173ed24e | 126 | cnt += over - prev_overruns; |
7ee1768d | 127 | prev_overruns = over; |
2039238b PP |
128 | return cnt; |
129 | } | |
130 | ||
d0a7e8ca PP |
131 | static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, |
132 | char __user *ubuf, size_t cnt, loff_t *ppos) | |
133 | { | |
134 | ssize_t ret; | |
135 | struct header_iter *hiter = iter->private; | |
136 | struct trace_seq *s = &iter->seq; | |
2039238b PP |
137 | unsigned long n; |
138 | ||
139 | n = count_overruns(iter); | |
140 | if (n) { | |
141 | /* XXX: This is later than where events were lost. */ | |
142 | trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n); | |
143 | if (!overrun_detected) | |
a395d6a7 | 144 | pr_warn("mmiotrace has lost events\n"); |
2039238b PP |
145 | overrun_detected = true; |
146 | goto print_out; | |
147 | } | |
d0a7e8ca PP |
148 | |
149 | if (!hiter) | |
150 | return 0; | |
151 | ||
152 | mmio_print_pcidev(s, hiter->dev); | |
153 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev); | |
154 | ||
155 | if (!hiter->dev) { | |
156 | destroy_header_iter(hiter); | |
157 | iter->private = NULL; | |
158 | } | |
159 | ||
2039238b | 160 | print_out: |
d0a7e8ca PP |
161 | ret = trace_seq_to_user(s, ubuf, cnt); |
162 | return (ret == -EBUSY) ? 0 : ret; | |
bd8ac686 PP |
163 | } |
164 | ||
07f4e4f7 | 165 | static enum print_line_t mmio_print_rw(struct trace_iterator *iter) |
bd8ac686 PP |
166 | { |
167 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
168 | struct trace_mmiotrace_rw *field; |
169 | struct mmiotrace_rw *rw; | |
bd8ac686 | 170 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 171 | unsigned long long t = ns2usecs(iter->ts); |
a5dec557 | 172 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
bd8ac686 | 173 | unsigned secs = (unsigned long)t; |
bd8ac686 | 174 | |
7104f300 SR |
175 | trace_assign_type(field, entry); |
176 | rw = &field->rw; | |
177 | ||
777e208d | 178 | switch (rw->opcode) { |
bd8ac686 | 179 | case MMIO_READ: |
a72e10af | 180 | trace_seq_printf(s, |
5e4abc98 | 181 | "R %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
182 | rw->width, secs, usec_rem, rw->map_id, |
183 | (unsigned long long)rw->phys, | |
736ca61f | 184 | rw->value, rw->pc, 0); |
bd8ac686 PP |
185 | break; |
186 | case MMIO_WRITE: | |
a72e10af | 187 | trace_seq_printf(s, |
5e4abc98 | 188 | "W %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
189 | rw->width, secs, usec_rem, rw->map_id, |
190 | (unsigned long long)rw->phys, | |
736ca61f | 191 | rw->value, rw->pc, 0); |
bd8ac686 PP |
192 | break; |
193 | case MMIO_UNKNOWN_OP: | |
a72e10af | 194 | trace_seq_printf(s, |
5e4abc98 SR |
195 | "UNKNOWN %u.%06lu %d 0x%llx %02lx,%02lx," |
196 | "%02lx 0x%lx %d\n", | |
dee310d0 PP |
197 | secs, usec_rem, rw->map_id, |
198 | (unsigned long long)rw->phys, | |
bd8ac686 | 199 | (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff, |
736ca61f | 200 | (rw->value >> 0) & 0xff, rw->pc, 0); |
bd8ac686 PP |
201 | break; |
202 | default: | |
a72e10af | 203 | trace_seq_puts(s, "rw what?\n"); |
bd8ac686 PP |
204 | break; |
205 | } | |
a72e10af SRRH |
206 | |
207 | return trace_handle_return(s); | |
bd8ac686 PP |
208 | } |
209 | ||
07f4e4f7 | 210 | static enum print_line_t mmio_print_map(struct trace_iterator *iter) |
bd8ac686 PP |
211 | { |
212 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
213 | struct trace_mmiotrace_map *field; |
214 | struct mmiotrace_map *m; | |
bd8ac686 | 215 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 216 | unsigned long long t = ns2usecs(iter->ts); |
a5dec557 | 217 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
bd8ac686 | 218 | unsigned secs = (unsigned long)t; |
bd8ac686 | 219 | |
7104f300 SR |
220 | trace_assign_type(field, entry); |
221 | m = &field->map; | |
222 | ||
777e208d | 223 | switch (m->opcode) { |
bd8ac686 | 224 | case MMIO_PROBE: |
a72e10af | 225 | trace_seq_printf(s, |
5e4abc98 | 226 | "MAP %u.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
227 | secs, usec_rem, m->map_id, |
228 | (unsigned long long)m->phys, m->virt, m->len, | |
e0fd5c2f | 229 | 0UL, 0); |
bd8ac686 PP |
230 | break; |
231 | case MMIO_UNPROBE: | |
a72e10af | 232 | trace_seq_printf(s, |
5e4abc98 | 233 | "UNMAP %u.%06lu %d 0x%lx %d\n", |
e0fd5c2f | 234 | secs, usec_rem, m->map_id, 0UL, 0); |
bd8ac686 PP |
235 | break; |
236 | default: | |
a72e10af | 237 | trace_seq_puts(s, "map what?\n"); |
bd8ac686 PP |
238 | break; |
239 | } | |
a72e10af SRRH |
240 | |
241 | return trace_handle_return(s); | |
bd8ac686 PP |
242 | } |
243 | ||
07f4e4f7 | 244 | static enum print_line_t mmio_print_mark(struct trace_iterator *iter) |
fc5e27ae PP |
245 | { |
246 | struct trace_entry *entry = iter->ent; | |
777e208d | 247 | struct print_entry *print = (struct print_entry *)entry; |
48ead020 | 248 | const char *msg = print->buf; |
fc5e27ae | 249 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 250 | unsigned long long t = ns2usecs(iter->ts); |
769b0441 | 251 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
fc5e27ae | 252 | unsigned secs = (unsigned long)t; |
fc5e27ae PP |
253 | |
254 | /* The trailing newline must be in the message. */ | |
a72e10af | 255 | trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg); |
fc5e27ae | 256 | |
a72e10af | 257 | return trace_handle_return(s); |
fc5e27ae PP |
258 | } |
259 | ||
07f4e4f7 | 260 | static enum print_line_t mmio_print_line(struct trace_iterator *iter) |
bd8ac686 PP |
261 | { |
262 | switch (iter->ent->type) { | |
263 | case TRACE_MMIO_RW: | |
264 | return mmio_print_rw(iter); | |
265 | case TRACE_MMIO_MAP: | |
266 | return mmio_print_map(iter); | |
fc5e27ae PP |
267 | case TRACE_PRINT: |
268 | return mmio_print_mark(iter); | |
bd8ac686 | 269 | default: |
07f4e4f7 | 270 | return TRACE_TYPE_HANDLED; /* ignore unknown entries */ |
bd8ac686 | 271 | } |
f984b51e PP |
272 | } |
273 | ||
274 | static struct tracer mmio_tracer __read_mostly = | |
275 | { | |
276 | .name = "mmiotrace", | |
277 | .init = mmio_trace_init, | |
278 | .reset = mmio_trace_reset, | |
bbf5b1a0 | 279 | .start = mmio_trace_start, |
d0a7e8ca PP |
280 | .pipe_open = mmio_pipe_open, |
281 | .close = mmio_close, | |
282 | .read = mmio_read, | |
bd8ac686 | 283 | .print_line = mmio_print_line, |
c7b3ae0b | 284 | .noboot = true, |
f984b51e PP |
285 | }; |
286 | ||
287 | __init static int init_mmio_trace(void) | |
288 | { | |
f984b51e PP |
289 | return register_tracer(&mmio_tracer); |
290 | } | |
291 | device_initcall(init_mmio_trace); | |
292 | ||
45dcd8b8 PP |
293 | static void __trace_mmiotrace_rw(struct trace_array *tr, |
294 | struct trace_array_cpu *data, | |
295 | struct mmiotrace_rw *rw) | |
296 | { | |
2425bcb9 | 297 | struct trace_event_call *call = &event_mmiotrace_rw; |
13292494 | 298 | struct trace_buffer *buffer = tr->array_buffer.buffer; |
3928a8a2 | 299 | struct ring_buffer_event *event; |
777e208d | 300 | struct trace_mmiotrace_rw *entry; |
36590c50 | 301 | unsigned int trace_ctx; |
45dcd8b8 | 302 | |
36590c50 | 303 | trace_ctx = tracing_gen_ctx_flags(0); |
e77405ad | 304 | event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_RW, |
36590c50 | 305 | sizeof(*entry), trace_ctx); |
173ed24e PP |
306 | if (!event) { |
307 | atomic_inc(&dropped_count); | |
3928a8a2 | 308 | return; |
173ed24e | 309 | } |
3928a8a2 | 310 | entry = ring_buffer_event_data(event); |
777e208d | 311 | entry->rw = *rw; |
60ba7702 | 312 | |
f306cc82 | 313 | if (!call_filter_check_discard(call, entry, buffer, event)) |
36590c50 | 314 | trace_buffer_unlock_commit(tr, buffer, event, trace_ctx); |
45dcd8b8 PP |
315 | } |
316 | ||
bd8ac686 | 317 | void mmio_trace_rw(struct mmiotrace_rw *rw) |
f984b51e PP |
318 | { |
319 | struct trace_array *tr = mmio_trace_array; | |
1c5eb448 | 320 | struct trace_array_cpu *data = per_cpu_ptr(tr->array_buffer.data, smp_processor_id()); |
bd8ac686 PP |
321 | __trace_mmiotrace_rw(tr, data, rw); |
322 | } | |
f984b51e | 323 | |
45dcd8b8 PP |
324 | static void __trace_mmiotrace_map(struct trace_array *tr, |
325 | struct trace_array_cpu *data, | |
326 | struct mmiotrace_map *map) | |
327 | { | |
2425bcb9 | 328 | struct trace_event_call *call = &event_mmiotrace_map; |
13292494 | 329 | struct trace_buffer *buffer = tr->array_buffer.buffer; |
3928a8a2 | 330 | struct ring_buffer_event *event; |
777e208d | 331 | struct trace_mmiotrace_map *entry; |
36590c50 | 332 | unsigned int trace_ctx; |
45dcd8b8 | 333 | |
36590c50 | 334 | trace_ctx = tracing_gen_ctx_flags(0); |
e77405ad | 335 | event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_MAP, |
36590c50 | 336 | sizeof(*entry), trace_ctx); |
173ed24e PP |
337 | if (!event) { |
338 | atomic_inc(&dropped_count); | |
3928a8a2 | 339 | return; |
173ed24e | 340 | } |
3928a8a2 | 341 | entry = ring_buffer_event_data(event); |
777e208d | 342 | entry->map = *map; |
60ba7702 | 343 | |
f306cc82 | 344 | if (!call_filter_check_discard(call, entry, buffer, event)) |
36590c50 | 345 | trace_buffer_unlock_commit(tr, buffer, event, trace_ctx); |
45dcd8b8 PP |
346 | } |
347 | ||
bd8ac686 PP |
348 | void mmio_trace_mapping(struct mmiotrace_map *map) |
349 | { | |
350 | struct trace_array *tr = mmio_trace_array; | |
351 | struct trace_array_cpu *data; | |
352 | ||
353 | preempt_disable(); | |
1c5eb448 | 354 | data = per_cpu_ptr(tr->array_buffer.data, smp_processor_id()); |
bd8ac686 PP |
355 | __trace_mmiotrace_map(tr, data, map); |
356 | preempt_enable(); | |
f984b51e | 357 | } |
9e57fb35 PP |
358 | |
359 | int mmio_trace_printk(const char *fmt, va_list args) | |
360 | { | |
40ce74f1 | 361 | return trace_vprintk(0, fmt, args); |
9e57fb35 | 362 | } |