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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 | ||
8 | #define DEBUG 1 | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/mmiotrace.h> | |
13829537 | 12 | #include <linux/pci.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
a5dec557 LZ |
14 | #include <linux/time.h> |
15 | ||
60063497 | 16 | #include <linux/atomic.h> |
f984b51e PP |
17 | |
18 | #include "trace.h" | |
f0868d1e | 19 | #include "trace_output.h" |
f984b51e | 20 | |
d0a7e8ca PP |
21 | struct header_iter { |
22 | struct pci_dev *dev; | |
23 | }; | |
24 | ||
f984b51e | 25 | static struct trace_array *mmio_trace_array; |
2039238b | 26 | static bool overrun_detected; |
7ee1768d | 27 | static unsigned long prev_overruns; |
173ed24e | 28 | static atomic_t dropped_count; |
f984b51e | 29 | |
bd8ac686 PP |
30 | static void mmio_reset_data(struct trace_array *tr) |
31 | { | |
2039238b | 32 | overrun_detected = false; |
7ee1768d | 33 | prev_overruns = 0; |
bd8ac686 | 34 | |
12883efb | 35 | tracing_reset_online_cpus(&tr->trace_buffer); |
bd8ac686 | 36 | } |
f984b51e | 37 | |
1c80025a | 38 | static int mmio_trace_init(struct trace_array *tr) |
f984b51e PP |
39 | { |
40 | pr_debug("in %s\n", __func__); | |
41 | mmio_trace_array = tr; | |
c76f0694 SR |
42 | |
43 | mmio_reset_data(tr); | |
44 | enable_mmiotrace(); | |
1c80025a | 45 | return 0; |
f984b51e PP |
46 | } |
47 | ||
48 | static void mmio_trace_reset(struct trace_array *tr) | |
49 | { | |
50 | pr_debug("in %s\n", __func__); | |
c76f0694 SR |
51 | |
52 | disable_mmiotrace(); | |
bd8ac686 PP |
53 | mmio_reset_data(tr); |
54 | mmio_trace_array = NULL; | |
f984b51e PP |
55 | } |
56 | ||
bbf5b1a0 | 57 | static void mmio_trace_start(struct trace_array *tr) |
f984b51e PP |
58 | { |
59 | pr_debug("in %s\n", __func__); | |
bbf5b1a0 | 60 | mmio_reset_data(tr); |
bd8ac686 PP |
61 | } |
62 | ||
a72e10af | 63 | static void mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
13829537 | 64 | { |
13829537 PP |
65 | int i; |
66 | resource_size_t start, end; | |
67 | const struct pci_driver *drv = pci_dev_driver(dev); | |
68 | ||
a72e10af SRRH |
69 | trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", |
70 | dev->bus->number, dev->devfn, | |
71 | dev->vendor, dev->device, dev->irq); | |
13829537 | 72 | for (i = 0; i < 7; i++) { |
9a51933e | 73 | start = dev->resource[i].start; |
a72e10af | 74 | trace_seq_printf(s, " %llx", |
13829537 PP |
75 | (unsigned long long)(start | |
76 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
77 | } | |
78 | for (i = 0; i < 7; i++) { | |
9a51933e BH |
79 | start = dev->resource[i].start; |
80 | end = dev->resource[i].end; | |
a72e10af | 81 | trace_seq_printf(s, " %llx", |
13829537 PP |
82 | dev->resource[i].start < dev->resource[i].end ? |
83 | (unsigned long long)(end - start) + 1 : 0); | |
84 | } | |
85 | if (drv) | |
a72e10af | 86 | trace_seq_printf(s, " %s\n", drv->name); |
13829537 | 87 | else |
a72e10af | 88 | trace_seq_puts(s, " \n"); |
13829537 PP |
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 | 103 | |
146c3442 | 104 | trace_seq_puts(s, "VERSION 20070824\n"); |
13829537 | 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 | { | |
173ed24e | 124 | unsigned long cnt = atomic_xchg(&dropped_count, 0); |
12883efb | 125 | unsigned long over = ring_buffer_overruns(iter->trace_buffer->buffer); |
7ee1768d PP |
126 | |
127 | if (over > prev_overruns) | |
173ed24e | 128 | cnt += over - prev_overruns; |
7ee1768d | 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) | |
a395d6a7 | 146 | pr_warn("mmiotrace has lost events\n"); |
2039238b PP |
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); |
a5dec557 | 174 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
bd8ac686 | 175 | unsigned secs = (unsigned long)t; |
bd8ac686 | 176 | |
7104f300 SR |
177 | trace_assign_type(field, entry); |
178 | rw = &field->rw; | |
179 | ||
777e208d | 180 | switch (rw->opcode) { |
bd8ac686 | 181 | case MMIO_READ: |
a72e10af | 182 | trace_seq_printf(s, |
5e4abc98 | 183 | "R %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
184 | rw->width, secs, usec_rem, rw->map_id, |
185 | (unsigned long long)rw->phys, | |
736ca61f | 186 | rw->value, rw->pc, 0); |
bd8ac686 PP |
187 | break; |
188 | case MMIO_WRITE: | |
a72e10af | 189 | trace_seq_printf(s, |
5e4abc98 | 190 | "W %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
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_UNKNOWN_OP: | |
a72e10af | 196 | trace_seq_printf(s, |
5e4abc98 SR |
197 | "UNKNOWN %u.%06lu %d 0x%llx %02lx,%02lx," |
198 | "%02lx 0x%lx %d\n", | |
dee310d0 PP |
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: | |
a72e10af | 205 | trace_seq_puts(s, "rw what?\n"); |
bd8ac686 PP |
206 | break; |
207 | } | |
a72e10af SRRH |
208 | |
209 | return trace_handle_return(s); | |
bd8ac686 PP |
210 | } |
211 | ||
07f4e4f7 | 212 | static enum print_line_t mmio_print_map(struct trace_iterator *iter) |
bd8ac686 PP |
213 | { |
214 | struct trace_entry *entry = iter->ent; | |
7104f300 SR |
215 | struct trace_mmiotrace_map *field; |
216 | struct mmiotrace_map *m; | |
bd8ac686 | 217 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 218 | unsigned long long t = ns2usecs(iter->ts); |
a5dec557 | 219 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
bd8ac686 | 220 | unsigned secs = (unsigned long)t; |
bd8ac686 | 221 | |
7104f300 SR |
222 | trace_assign_type(field, entry); |
223 | m = &field->map; | |
224 | ||
777e208d | 225 | switch (m->opcode) { |
bd8ac686 | 226 | case MMIO_PROBE: |
a72e10af | 227 | trace_seq_printf(s, |
5e4abc98 | 228 | "MAP %u.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
dee310d0 PP |
229 | secs, usec_rem, m->map_id, |
230 | (unsigned long long)m->phys, m->virt, m->len, | |
e0fd5c2f | 231 | 0UL, 0); |
bd8ac686 PP |
232 | break; |
233 | case MMIO_UNPROBE: | |
a72e10af | 234 | trace_seq_printf(s, |
5e4abc98 | 235 | "UNMAP %u.%06lu %d 0x%lx %d\n", |
e0fd5c2f | 236 | secs, usec_rem, m->map_id, 0UL, 0); |
bd8ac686 PP |
237 | break; |
238 | default: | |
a72e10af | 239 | trace_seq_puts(s, "map what?\n"); |
bd8ac686 PP |
240 | break; |
241 | } | |
a72e10af SRRH |
242 | |
243 | return trace_handle_return(s); | |
bd8ac686 PP |
244 | } |
245 | ||
07f4e4f7 | 246 | static enum print_line_t mmio_print_mark(struct trace_iterator *iter) |
fc5e27ae PP |
247 | { |
248 | struct trace_entry *entry = iter->ent; | |
777e208d | 249 | struct print_entry *print = (struct print_entry *)entry; |
48ead020 | 250 | const char *msg = print->buf; |
fc5e27ae | 251 | struct trace_seq *s = &iter->seq; |
3928a8a2 | 252 | unsigned long long t = ns2usecs(iter->ts); |
769b0441 | 253 | unsigned long usec_rem = do_div(t, USEC_PER_SEC); |
fc5e27ae | 254 | unsigned secs = (unsigned long)t; |
fc5e27ae PP |
255 | |
256 | /* The trailing newline must be in the message. */ | |
a72e10af | 257 | trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg); |
fc5e27ae | 258 | |
a72e10af | 259 | return trace_handle_return(s); |
fc5e27ae PP |
260 | } |
261 | ||
07f4e4f7 | 262 | static enum print_line_t mmio_print_line(struct trace_iterator *iter) |
bd8ac686 PP |
263 | { |
264 | switch (iter->ent->type) { | |
265 | case TRACE_MMIO_RW: | |
266 | return mmio_print_rw(iter); | |
267 | case TRACE_MMIO_MAP: | |
268 | return mmio_print_map(iter); | |
fc5e27ae PP |
269 | case TRACE_PRINT: |
270 | return mmio_print_mark(iter); | |
bd8ac686 | 271 | default: |
07f4e4f7 | 272 | return TRACE_TYPE_HANDLED; /* ignore unknown entries */ |
bd8ac686 | 273 | } |
f984b51e PP |
274 | } |
275 | ||
276 | static struct tracer mmio_tracer __read_mostly = | |
277 | { | |
278 | .name = "mmiotrace", | |
279 | .init = mmio_trace_init, | |
280 | .reset = mmio_trace_reset, | |
bbf5b1a0 | 281 | .start = mmio_trace_start, |
d0a7e8ca PP |
282 | .pipe_open = mmio_pipe_open, |
283 | .close = mmio_close, | |
284 | .read = mmio_read, | |
bd8ac686 | 285 | .print_line = mmio_print_line, |
c7b3ae0b | 286 | .noboot = true, |
f984b51e PP |
287 | }; |
288 | ||
289 | __init static int init_mmio_trace(void) | |
290 | { | |
f984b51e PP |
291 | return register_tracer(&mmio_tracer); |
292 | } | |
293 | device_initcall(init_mmio_trace); | |
294 | ||
45dcd8b8 PP |
295 | static void __trace_mmiotrace_rw(struct trace_array *tr, |
296 | struct trace_array_cpu *data, | |
297 | struct mmiotrace_rw *rw) | |
298 | { | |
2425bcb9 | 299 | struct trace_event_call *call = &event_mmiotrace_rw; |
12883efb | 300 | struct ring_buffer *buffer = tr->trace_buffer.buffer; |
3928a8a2 | 301 | struct ring_buffer_event *event; |
777e208d | 302 | struct trace_mmiotrace_rw *entry; |
51a763dd | 303 | int pc = preempt_count(); |
45dcd8b8 | 304 | |
e77405ad | 305 | event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_RW, |
51a763dd | 306 | sizeof(*entry), 0, pc); |
173ed24e PP |
307 | if (!event) { |
308 | atomic_inc(&dropped_count); | |
3928a8a2 | 309 | return; |
173ed24e | 310 | } |
3928a8a2 | 311 | entry = ring_buffer_event_data(event); |
777e208d | 312 | entry->rw = *rw; |
60ba7702 | 313 | |
f306cc82 | 314 | if (!call_filter_check_discard(call, entry, buffer, event)) |
b7f0c959 | 315 | trace_buffer_unlock_commit(tr, buffer, event, 0, pc); |
45dcd8b8 PP |
316 | } |
317 | ||
bd8ac686 | 318 | void mmio_trace_rw(struct mmiotrace_rw *rw) |
f984b51e PP |
319 | { |
320 | struct trace_array *tr = mmio_trace_array; | |
12883efb | 321 | struct trace_array_cpu *data = per_cpu_ptr(tr->trace_buffer.data, smp_processor_id()); |
bd8ac686 PP |
322 | __trace_mmiotrace_rw(tr, data, rw); |
323 | } | |
f984b51e | 324 | |
45dcd8b8 PP |
325 | static void __trace_mmiotrace_map(struct trace_array *tr, |
326 | struct trace_array_cpu *data, | |
327 | struct mmiotrace_map *map) | |
328 | { | |
2425bcb9 | 329 | struct trace_event_call *call = &event_mmiotrace_map; |
12883efb | 330 | struct ring_buffer *buffer = tr->trace_buffer.buffer; |
3928a8a2 | 331 | struct ring_buffer_event *event; |
777e208d | 332 | struct trace_mmiotrace_map *entry; |
51a763dd | 333 | int pc = preempt_count(); |
45dcd8b8 | 334 | |
e77405ad | 335 | event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_MAP, |
51a763dd | 336 | sizeof(*entry), 0, pc); |
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)) |
b7f0c959 | 345 | trace_buffer_unlock_commit(tr, buffer, event, 0, pc); |
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(); | |
12883efb | 354 | data = per_cpu_ptr(tr->trace_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 | } |