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Commit | Line | Data |
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2056a782 | 1 | /* |
0fe23479 | 2 | * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk> |
2056a782 JA |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | * | |
17 | */ | |
2056a782 JA |
18 | #include <linux/kernel.h> |
19 | #include <linux/blkdev.h> | |
20 | #include <linux/blktrace_api.h> | |
21 | #include <linux/percpu.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/mutex.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
2056a782 | 25 | #include <linux/debugfs.h> |
be1c6341 | 26 | #include <linux/time.h> |
939b3669 | 27 | #include <linux/uaccess.h> |
55782138 LZ |
28 | |
29 | #include <trace/events/block.h> | |
30 | ||
2db270a8 | 31 | #include "trace_output.h" |
2056a782 | 32 | |
55782138 LZ |
33 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
34 | ||
2056a782 JA |
35 | static unsigned int blktrace_seq __read_mostly = 1; |
36 | ||
c71a8961 | 37 | static struct trace_array *blk_tr; |
5006ea73 | 38 | static bool blk_tracer_enabled __read_mostly; |
c71a8961 ACM |
39 | |
40 | /* Select an alternative, minimalistic output than the original one */ | |
ef18012b | 41 | #define TRACE_BLK_OPT_CLASSIC 0x1 |
c71a8961 ACM |
42 | |
43 | static struct tracer_opt blk_tracer_opts[] = { | |
44 | /* Default disable the minimalistic output */ | |
157f9c00 | 45 | { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) }, |
c71a8961 ACM |
46 | { } |
47 | }; | |
48 | ||
49 | static struct tracer_flags blk_tracer_flags = { | |
50 | .val = 0, | |
51 | .opts = blk_tracer_opts, | |
52 | }; | |
53 | ||
5f3ea37c | 54 | /* Global reference count of probes */ |
5f3ea37c ACM |
55 | static atomic_t blk_probes_ref = ATOMIC_INIT(0); |
56 | ||
3c289ba7 | 57 | static void blk_register_tracepoints(void); |
5f3ea37c ACM |
58 | static void blk_unregister_tracepoints(void); |
59 | ||
be1c6341 OK |
60 | /* |
61 | * Send out a notify message. | |
62 | */ | |
a863055b JA |
63 | static void trace_note(struct blk_trace *bt, pid_t pid, int action, |
64 | const void *data, size_t len) | |
be1c6341 OK |
65 | { |
66 | struct blk_io_trace *t; | |
18cea459 | 67 | struct ring_buffer_event *event = NULL; |
e77405ad | 68 | struct ring_buffer *buffer = NULL; |
18cea459 LZ |
69 | int pc = 0; |
70 | int cpu = smp_processor_id(); | |
71 | bool blk_tracer = blk_tracer_enabled; | |
72 | ||
73 | if (blk_tracer) { | |
e77405ad | 74 | buffer = blk_tr->buffer; |
18cea459 | 75 | pc = preempt_count(); |
e77405ad | 76 | event = trace_buffer_lock_reserve(buffer, TRACE_BLK, |
18cea459 LZ |
77 | sizeof(*t) + len, |
78 | 0, pc); | |
79 | if (!event) | |
80 | return; | |
81 | t = ring_buffer_event_data(event); | |
82 | goto record_it; | |
83 | } | |
be1c6341 | 84 | |
c71a8961 ACM |
85 | if (!bt->rchan) |
86 | return; | |
87 | ||
be1c6341 | 88 | t = relay_reserve(bt->rchan, sizeof(*t) + len); |
d3d9d2a5 | 89 | if (t) { |
d3d9d2a5 | 90 | t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; |
2997c8c4 | 91 | t->time = ktime_to_ns(ktime_get()); |
18cea459 | 92 | record_it: |
d3d9d2a5 JA |
93 | t->device = bt->dev; |
94 | t->action = action; | |
95 | t->pid = pid; | |
96 | t->cpu = cpu; | |
97 | t->pdu_len = len; | |
98 | memcpy((void *) t + sizeof(*t), data, len); | |
18cea459 LZ |
99 | |
100 | if (blk_tracer) | |
e77405ad | 101 | trace_buffer_unlock_commit(buffer, event, 0, pc); |
d3d9d2a5 | 102 | } |
be1c6341 OK |
103 | } |
104 | ||
2056a782 JA |
105 | /* |
106 | * Send out a notify for this process, if we haven't done so since a trace | |
107 | * started | |
108 | */ | |
109 | static void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk) | |
110 | { | |
a863055b JA |
111 | tsk->btrace_seq = blktrace_seq; |
112 | trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm)); | |
be1c6341 | 113 | } |
2056a782 | 114 | |
be1c6341 OK |
115 | static void trace_note_time(struct blk_trace *bt) |
116 | { | |
117 | struct timespec now; | |
118 | unsigned long flags; | |
119 | u32 words[2]; | |
120 | ||
121 | getnstimeofday(&now); | |
122 | words[0] = now.tv_sec; | |
123 | words[1] = now.tv_nsec; | |
124 | ||
125 | local_irq_save(flags); | |
126 | trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words)); | |
127 | local_irq_restore(flags); | |
2056a782 JA |
128 | } |
129 | ||
9d5f09a4 AB |
130 | void __trace_note_message(struct blk_trace *bt, const char *fmt, ...) |
131 | { | |
132 | int n; | |
133 | va_list args; | |
14a73f54 | 134 | unsigned long flags; |
64565911 | 135 | char *buf; |
9d5f09a4 | 136 | |
18cea459 LZ |
137 | if (unlikely(bt->trace_state != Blktrace_running && |
138 | !blk_tracer_enabled)) | |
c71a8961 ACM |
139 | return; |
140 | ||
490da40d TM |
141 | /* |
142 | * If the BLK_TC_NOTIFY action mask isn't set, don't send any note | |
143 | * message to the trace. | |
144 | */ | |
145 | if (!(bt->act_mask & BLK_TC_NOTIFY)) | |
146 | return; | |
147 | ||
14a73f54 | 148 | local_irq_save(flags); |
64565911 | 149 | buf = per_cpu_ptr(bt->msg_data, smp_processor_id()); |
9d5f09a4 | 150 | va_start(args, fmt); |
64565911 | 151 | n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); |
9d5f09a4 AB |
152 | va_end(args); |
153 | ||
64565911 | 154 | trace_note(bt, 0, BLK_TN_MESSAGE, buf, n); |
14a73f54 | 155 | local_irq_restore(flags); |
9d5f09a4 AB |
156 | } |
157 | EXPORT_SYMBOL_GPL(__trace_note_message); | |
158 | ||
2056a782 JA |
159 | static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, |
160 | pid_t pid) | |
161 | { | |
162 | if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) | |
163 | return 1; | |
d0deef5b | 164 | if (sector && (sector < bt->start_lba || sector > bt->end_lba)) |
2056a782 JA |
165 | return 1; |
166 | if (bt->pid && pid != bt->pid) | |
167 | return 1; | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | /* | |
173 | * Data direction bit lookup | |
174 | */ | |
e4955c99 LZ |
175 | static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), |
176 | BLK_TC_ACT(BLK_TC_WRITE) }; | |
2056a782 | 177 | |
7b6d91da CH |
178 | #define BLK_TC_RAHEAD BLK_TC_AHEAD |
179 | ||
35ba8f70 | 180 | /* The ilog2() calls fall out because they're constant */ |
7b6d91da CH |
181 | #define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \ |
182 | (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name)) | |
2056a782 JA |
183 | |
184 | /* | |
185 | * The worker for the various blk_add_trace*() types. Fills out a | |
186 | * blk_io_trace structure and places it in a per-cpu subbuffer. | |
187 | */ | |
5f3ea37c | 188 | static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, |
2056a782 JA |
189 | int rw, u32 what, int error, int pdu_len, void *pdu_data) |
190 | { | |
191 | struct task_struct *tsk = current; | |
c71a8961 | 192 | struct ring_buffer_event *event = NULL; |
e77405ad | 193 | struct ring_buffer *buffer = NULL; |
2056a782 | 194 | struct blk_io_trace *t; |
0a987751 | 195 | unsigned long flags = 0; |
2056a782 JA |
196 | unsigned long *sequence; |
197 | pid_t pid; | |
c71a8961 | 198 | int cpu, pc = 0; |
18cea459 | 199 | bool blk_tracer = blk_tracer_enabled; |
2056a782 | 200 | |
18cea459 | 201 | if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) |
2056a782 JA |
202 | return; |
203 | ||
204 | what |= ddir_act[rw & WRITE]; | |
7b6d91da CH |
205 | what |= MASK_TC_BIT(rw, SYNC); |
206 | what |= MASK_TC_BIT(rw, RAHEAD); | |
35ba8f70 DW |
207 | what |= MASK_TC_BIT(rw, META); |
208 | what |= MASK_TC_BIT(rw, DISCARD); | |
c09c47ca NK |
209 | what |= MASK_TC_BIT(rw, FLUSH); |
210 | what |= MASK_TC_BIT(rw, FUA); | |
2056a782 JA |
211 | |
212 | pid = tsk->pid; | |
d0deef5b | 213 | if (act_log_check(bt, what, sector, pid)) |
2056a782 | 214 | return; |
c71a8961 ACM |
215 | cpu = raw_smp_processor_id(); |
216 | ||
18cea459 | 217 | if (blk_tracer) { |
c71a8961 ACM |
218 | tracing_record_cmdline(current); |
219 | ||
e77405ad | 220 | buffer = blk_tr->buffer; |
51a763dd | 221 | pc = preempt_count(); |
e77405ad | 222 | event = trace_buffer_lock_reserve(buffer, TRACE_BLK, |
51a763dd ACM |
223 | sizeof(*t) + pdu_len, |
224 | 0, pc); | |
c71a8961 ACM |
225 | if (!event) |
226 | return; | |
51a763dd | 227 | t = ring_buffer_event_data(event); |
c71a8961 ACM |
228 | goto record_it; |
229 | } | |
2056a782 JA |
230 | |
231 | /* | |
232 | * A word about the locking here - we disable interrupts to reserve | |
233 | * some space in the relay per-cpu buffer, to prevent an irq | |
14a73f54 | 234 | * from coming in and stepping on our toes. |
2056a782 JA |
235 | */ |
236 | local_irq_save(flags); | |
237 | ||
238 | if (unlikely(tsk->btrace_seq != blktrace_seq)) | |
239 | trace_note_tsk(bt, tsk); | |
240 | ||
241 | t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len); | |
242 | if (t) { | |
2056a782 JA |
243 | sequence = per_cpu_ptr(bt->sequence, cpu); |
244 | ||
245 | t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; | |
246 | t->sequence = ++(*sequence); | |
2997c8c4 | 247 | t->time = ktime_to_ns(ktime_get()); |
c71a8961 | 248 | record_it: |
08a06b83 | 249 | /* |
939b3669 ACM |
250 | * These two are not needed in ftrace as they are in the |
251 | * generic trace_entry, filled by tracing_generic_entry_update, | |
252 | * but for the trace_event->bin() synthesizer benefit we do it | |
253 | * here too. | |
254 | */ | |
255 | t->cpu = cpu; | |
256 | t->pid = pid; | |
08a06b83 | 257 | |
2056a782 JA |
258 | t->sector = sector; |
259 | t->bytes = bytes; | |
260 | t->action = what; | |
2056a782 | 261 | t->device = bt->dev; |
2056a782 JA |
262 | t->error = error; |
263 | t->pdu_len = pdu_len; | |
264 | ||
265 | if (pdu_len) | |
266 | memcpy((void *) t + sizeof(*t), pdu_data, pdu_len); | |
c71a8961 | 267 | |
18cea459 | 268 | if (blk_tracer) { |
e77405ad | 269 | trace_buffer_unlock_commit(buffer, event, 0, pc); |
c71a8961 ACM |
270 | return; |
271 | } | |
2056a782 JA |
272 | } |
273 | ||
274 | local_irq_restore(flags); | |
275 | } | |
276 | ||
2056a782 | 277 | static struct dentry *blk_tree_root; |
11a57153 | 278 | static DEFINE_MUTEX(blk_tree_mutex); |
2056a782 | 279 | |
ad5dd549 | 280 | static void blk_trace_free(struct blk_trace *bt) |
2056a782 | 281 | { |
02c62304 | 282 | debugfs_remove(bt->msg_file); |
2056a782 | 283 | debugfs_remove(bt->dropped_file); |
f48fc4d3 | 284 | relay_close(bt->rchan); |
39cbb602 | 285 | debugfs_remove(bt->dir); |
2056a782 | 286 | free_percpu(bt->sequence); |
64565911 | 287 | free_percpu(bt->msg_data); |
2056a782 | 288 | kfree(bt); |
ad5dd549 LZ |
289 | } |
290 | ||
291 | static void blk_trace_cleanup(struct blk_trace *bt) | |
292 | { | |
293 | blk_trace_free(bt); | |
5f3ea37c ACM |
294 | if (atomic_dec_and_test(&blk_probes_ref)) |
295 | blk_unregister_tracepoints(); | |
2056a782 JA |
296 | } |
297 | ||
6da127ad | 298 | int blk_trace_remove(struct request_queue *q) |
2056a782 JA |
299 | { |
300 | struct blk_trace *bt; | |
301 | ||
302 | bt = xchg(&q->blk_trace, NULL); | |
303 | if (!bt) | |
304 | return -EINVAL; | |
305 | ||
55547204 | 306 | if (bt->trace_state != Blktrace_running) |
2056a782 JA |
307 | blk_trace_cleanup(bt); |
308 | ||
309 | return 0; | |
310 | } | |
6da127ad | 311 | EXPORT_SYMBOL_GPL(blk_trace_remove); |
2056a782 JA |
312 | |
313 | static int blk_dropped_open(struct inode *inode, struct file *filp) | |
314 | { | |
8e18e294 | 315 | filp->private_data = inode->i_private; |
2056a782 JA |
316 | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static ssize_t blk_dropped_read(struct file *filp, char __user *buffer, | |
321 | size_t count, loff_t *ppos) | |
322 | { | |
323 | struct blk_trace *bt = filp->private_data; | |
324 | char buf[16]; | |
325 | ||
326 | snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); | |
327 | ||
328 | return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); | |
329 | } | |
330 | ||
2b8693c0 | 331 | static const struct file_operations blk_dropped_fops = { |
2056a782 JA |
332 | .owner = THIS_MODULE, |
333 | .open = blk_dropped_open, | |
334 | .read = blk_dropped_read, | |
6038f373 | 335 | .llseek = default_llseek, |
2056a782 JA |
336 | }; |
337 | ||
02c62304 AB |
338 | static int blk_msg_open(struct inode *inode, struct file *filp) |
339 | { | |
340 | filp->private_data = inode->i_private; | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, | |
346 | size_t count, loff_t *ppos) | |
347 | { | |
348 | char *msg; | |
349 | struct blk_trace *bt; | |
350 | ||
7635b03a | 351 | if (count >= BLK_TN_MAX_MSG) |
02c62304 AB |
352 | return -EINVAL; |
353 | ||
a4b3ada8 | 354 | msg = kmalloc(count + 1, GFP_KERNEL); |
02c62304 AB |
355 | if (msg == NULL) |
356 | return -ENOMEM; | |
357 | ||
358 | if (copy_from_user(msg, buffer, count)) { | |
359 | kfree(msg); | |
360 | return -EFAULT; | |
361 | } | |
362 | ||
a4b3ada8 | 363 | msg[count] = '\0'; |
02c62304 AB |
364 | bt = filp->private_data; |
365 | __trace_note_message(bt, "%s", msg); | |
366 | kfree(msg); | |
367 | ||
368 | return count; | |
369 | } | |
370 | ||
371 | static const struct file_operations blk_msg_fops = { | |
372 | .owner = THIS_MODULE, | |
373 | .open = blk_msg_open, | |
374 | .write = blk_msg_write, | |
6038f373 | 375 | .llseek = noop_llseek, |
02c62304 AB |
376 | }; |
377 | ||
2056a782 JA |
378 | /* |
379 | * Keep track of how many times we encountered a full subbuffer, to aid | |
380 | * the user space app in telling how many lost events there were. | |
381 | */ | |
382 | static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, | |
383 | void *prev_subbuf, size_t prev_padding) | |
384 | { | |
385 | struct blk_trace *bt; | |
386 | ||
387 | if (!relay_buf_full(buf)) | |
388 | return 1; | |
389 | ||
390 | bt = buf->chan->private_data; | |
391 | atomic_inc(&bt->dropped); | |
392 | return 0; | |
393 | } | |
394 | ||
395 | static int blk_remove_buf_file_callback(struct dentry *dentry) | |
396 | { | |
397 | debugfs_remove(dentry); | |
f48fc4d3 | 398 | |
2056a782 JA |
399 | return 0; |
400 | } | |
401 | ||
402 | static struct dentry *blk_create_buf_file_callback(const char *filename, | |
403 | struct dentry *parent, | |
404 | int mode, | |
405 | struct rchan_buf *buf, | |
406 | int *is_global) | |
407 | { | |
408 | return debugfs_create_file(filename, mode, parent, buf, | |
409 | &relay_file_operations); | |
410 | } | |
411 | ||
412 | static struct rchan_callbacks blk_relay_callbacks = { | |
413 | .subbuf_start = blk_subbuf_start_callback, | |
414 | .create_buf_file = blk_create_buf_file_callback, | |
415 | .remove_buf_file = blk_remove_buf_file_callback, | |
416 | }; | |
417 | ||
9908c309 LZ |
418 | static void blk_trace_setup_lba(struct blk_trace *bt, |
419 | struct block_device *bdev) | |
420 | { | |
421 | struct hd_struct *part = NULL; | |
422 | ||
423 | if (bdev) | |
424 | part = bdev->bd_part; | |
425 | ||
426 | if (part) { | |
427 | bt->start_lba = part->start_sect; | |
428 | bt->end_lba = part->start_sect + part->nr_sects; | |
429 | } else { | |
430 | bt->start_lba = 0; | |
431 | bt->end_lba = -1ULL; | |
432 | } | |
433 | } | |
434 | ||
2056a782 JA |
435 | /* |
436 | * Setup everything required to start tracing | |
437 | */ | |
6da127ad | 438 | int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
d0deef5b SD |
439 | struct block_device *bdev, |
440 | struct blk_user_trace_setup *buts) | |
2056a782 | 441 | { |
2056a782 JA |
442 | struct blk_trace *old_bt, *bt = NULL; |
443 | struct dentry *dir = NULL; | |
2056a782 JA |
444 | int ret, i; |
445 | ||
171044d4 | 446 | if (!buts->buf_size || !buts->buf_nr) |
2056a782 JA |
447 | return -EINVAL; |
448 | ||
0497b345 JA |
449 | strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); |
450 | buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; | |
2056a782 JA |
451 | |
452 | /* | |
453 | * some device names have larger paths - convert the slashes | |
454 | * to underscores for this to work as expected | |
455 | */ | |
171044d4 AB |
456 | for (i = 0; i < strlen(buts->name); i++) |
457 | if (buts->name[i] == '/') | |
458 | buts->name[i] = '_'; | |
2056a782 | 459 | |
2056a782 JA |
460 | bt = kzalloc(sizeof(*bt), GFP_KERNEL); |
461 | if (!bt) | |
ad5dd549 | 462 | return -ENOMEM; |
2056a782 | 463 | |
ad5dd549 | 464 | ret = -ENOMEM; |
2056a782 JA |
465 | bt->sequence = alloc_percpu(unsigned long); |
466 | if (!bt->sequence) | |
467 | goto err; | |
468 | ||
313e458f | 469 | bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); |
64565911 JA |
470 | if (!bt->msg_data) |
471 | goto err; | |
472 | ||
2056a782 | 473 | ret = -ENOENT; |
f48fc4d3 | 474 | |
b5230b56 | 475 | mutex_lock(&blk_tree_mutex); |
f48fc4d3 JA |
476 | if (!blk_tree_root) { |
477 | blk_tree_root = debugfs_create_dir("block", NULL); | |
b5230b56 LZ |
478 | if (!blk_tree_root) { |
479 | mutex_unlock(&blk_tree_mutex); | |
1a17662e | 480 | goto err; |
b5230b56 | 481 | } |
f48fc4d3 | 482 | } |
b5230b56 | 483 | mutex_unlock(&blk_tree_mutex); |
f48fc4d3 JA |
484 | |
485 | dir = debugfs_create_dir(buts->name, blk_tree_root); | |
486 | ||
2056a782 JA |
487 | if (!dir) |
488 | goto err; | |
489 | ||
490 | bt->dir = dir; | |
6da127ad | 491 | bt->dev = dev; |
2056a782 JA |
492 | atomic_set(&bt->dropped, 0); |
493 | ||
494 | ret = -EIO; | |
939b3669 ACM |
495 | bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, |
496 | &blk_dropped_fops); | |
2056a782 JA |
497 | if (!bt->dropped_file) |
498 | goto err; | |
499 | ||
02c62304 AB |
500 | bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); |
501 | if (!bt->msg_file) | |
502 | goto err; | |
503 | ||
171044d4 AB |
504 | bt->rchan = relay_open("trace", dir, buts->buf_size, |
505 | buts->buf_nr, &blk_relay_callbacks, bt); | |
2056a782 JA |
506 | if (!bt->rchan) |
507 | goto err; | |
2056a782 | 508 | |
171044d4 | 509 | bt->act_mask = buts->act_mask; |
2056a782 JA |
510 | if (!bt->act_mask) |
511 | bt->act_mask = (u16) -1; | |
512 | ||
9908c309 | 513 | blk_trace_setup_lba(bt, bdev); |
2056a782 | 514 | |
d0deef5b SD |
515 | /* overwrite with user settings */ |
516 | if (buts->start_lba) | |
517 | bt->start_lba = buts->start_lba; | |
518 | if (buts->end_lba) | |
519 | bt->end_lba = buts->end_lba; | |
520 | ||
171044d4 | 521 | bt->pid = buts->pid; |
2056a782 JA |
522 | bt->trace_state = Blktrace_setup; |
523 | ||
524 | ret = -EBUSY; | |
525 | old_bt = xchg(&q->blk_trace, bt); | |
526 | if (old_bt) { | |
527 | (void) xchg(&q->blk_trace, old_bt); | |
528 | goto err; | |
529 | } | |
530 | ||
17ba97e3 | 531 | if (atomic_inc_return(&blk_probes_ref) == 1) |
cbe28296 LZ |
532 | blk_register_tracepoints(); |
533 | ||
2056a782 JA |
534 | return 0; |
535 | err: | |
ad5dd549 | 536 | blk_trace_free(bt); |
2056a782 JA |
537 | return ret; |
538 | } | |
171044d4 | 539 | |
6da127ad | 540 | int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
d0deef5b | 541 | struct block_device *bdev, |
6da127ad | 542 | char __user *arg) |
171044d4 AB |
543 | { |
544 | struct blk_user_trace_setup buts; | |
545 | int ret; | |
546 | ||
547 | ret = copy_from_user(&buts, arg, sizeof(buts)); | |
548 | if (ret) | |
549 | return -EFAULT; | |
550 | ||
d0deef5b | 551 | ret = do_blk_trace_setup(q, name, dev, bdev, &buts); |
171044d4 AB |
552 | if (ret) |
553 | return ret; | |
554 | ||
9a8c28c8 DM |
555 | if (copy_to_user(arg, &buts, sizeof(buts))) { |
556 | blk_trace_remove(q); | |
171044d4 | 557 | return -EFAULT; |
9a8c28c8 | 558 | } |
171044d4 AB |
559 | return 0; |
560 | } | |
6da127ad | 561 | EXPORT_SYMBOL_GPL(blk_trace_setup); |
2056a782 | 562 | |
62c2a7d9 AB |
563 | #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) |
564 | static int compat_blk_trace_setup(struct request_queue *q, char *name, | |
565 | dev_t dev, struct block_device *bdev, | |
566 | char __user *arg) | |
567 | { | |
568 | struct blk_user_trace_setup buts; | |
569 | struct compat_blk_user_trace_setup cbuts; | |
570 | int ret; | |
571 | ||
572 | if (copy_from_user(&cbuts, arg, sizeof(cbuts))) | |
573 | return -EFAULT; | |
574 | ||
575 | buts = (struct blk_user_trace_setup) { | |
576 | .act_mask = cbuts.act_mask, | |
577 | .buf_size = cbuts.buf_size, | |
578 | .buf_nr = cbuts.buf_nr, | |
579 | .start_lba = cbuts.start_lba, | |
580 | .end_lba = cbuts.end_lba, | |
581 | .pid = cbuts.pid, | |
582 | }; | |
583 | memcpy(&buts.name, &cbuts.name, 32); | |
584 | ||
585 | ret = do_blk_trace_setup(q, name, dev, bdev, &buts); | |
586 | if (ret) | |
587 | return ret; | |
588 | ||
589 | if (copy_to_user(arg, &buts.name, 32)) { | |
590 | blk_trace_remove(q); | |
591 | return -EFAULT; | |
592 | } | |
593 | ||
594 | return 0; | |
595 | } | |
596 | #endif | |
597 | ||
6da127ad | 598 | int blk_trace_startstop(struct request_queue *q, int start) |
2056a782 | 599 | { |
2056a782 | 600 | int ret; |
939b3669 | 601 | struct blk_trace *bt = q->blk_trace; |
2056a782 | 602 | |
939b3669 | 603 | if (bt == NULL) |
2056a782 JA |
604 | return -EINVAL; |
605 | ||
606 | /* | |
607 | * For starting a trace, we can transition from a setup or stopped | |
608 | * trace. For stopping a trace, the state must be running | |
609 | */ | |
610 | ret = -EINVAL; | |
611 | if (start) { | |
612 | if (bt->trace_state == Blktrace_setup || | |
613 | bt->trace_state == Blktrace_stopped) { | |
614 | blktrace_seq++; | |
615 | smp_mb(); | |
616 | bt->trace_state = Blktrace_running; | |
be1c6341 OK |
617 | |
618 | trace_note_time(bt); | |
2056a782 JA |
619 | ret = 0; |
620 | } | |
621 | } else { | |
622 | if (bt->trace_state == Blktrace_running) { | |
623 | bt->trace_state = Blktrace_stopped; | |
624 | relay_flush(bt->rchan); | |
625 | ret = 0; | |
626 | } | |
627 | } | |
628 | ||
629 | return ret; | |
630 | } | |
6da127ad | 631 | EXPORT_SYMBOL_GPL(blk_trace_startstop); |
2056a782 JA |
632 | |
633 | /** | |
634 | * blk_trace_ioctl: - handle the ioctls associated with tracing | |
635 | * @bdev: the block device | |
ef18012b | 636 | * @cmd: the ioctl cmd |
2056a782 JA |
637 | * @arg: the argument data, if any |
638 | * | |
639 | **/ | |
640 | int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) | |
641 | { | |
165125e1 | 642 | struct request_queue *q; |
2056a782 | 643 | int ret, start = 0; |
6da127ad | 644 | char b[BDEVNAME_SIZE]; |
2056a782 JA |
645 | |
646 | q = bdev_get_queue(bdev); | |
647 | if (!q) | |
648 | return -ENXIO; | |
649 | ||
650 | mutex_lock(&bdev->bd_mutex); | |
651 | ||
652 | switch (cmd) { | |
653 | case BLKTRACESETUP: | |
f36f21ec | 654 | bdevname(bdev, b); |
d0deef5b | 655 | ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); |
2056a782 | 656 | break; |
62c2a7d9 AB |
657 | #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) |
658 | case BLKTRACESETUP32: | |
659 | bdevname(bdev, b); | |
660 | ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); | |
661 | break; | |
662 | #endif | |
2056a782 JA |
663 | case BLKTRACESTART: |
664 | start = 1; | |
665 | case BLKTRACESTOP: | |
666 | ret = blk_trace_startstop(q, start); | |
667 | break; | |
668 | case BLKTRACETEARDOWN: | |
669 | ret = blk_trace_remove(q); | |
670 | break; | |
671 | default: | |
672 | ret = -ENOTTY; | |
673 | break; | |
674 | } | |
675 | ||
676 | mutex_unlock(&bdev->bd_mutex); | |
677 | return ret; | |
678 | } | |
679 | ||
680 | /** | |
681 | * blk_trace_shutdown: - stop and cleanup trace structures | |
682 | * @q: the request queue associated with the device | |
683 | * | |
684 | **/ | |
165125e1 | 685 | void blk_trace_shutdown(struct request_queue *q) |
2056a782 | 686 | { |
6c5c9341 AD |
687 | if (q->blk_trace) { |
688 | blk_trace_startstop(q, 0); | |
689 | blk_trace_remove(q); | |
690 | } | |
2056a782 | 691 | } |
5f3ea37c ACM |
692 | |
693 | /* | |
694 | * blktrace probes | |
695 | */ | |
696 | ||
697 | /** | |
698 | * blk_add_trace_rq - Add a trace for a request oriented action | |
699 | * @q: queue the io is for | |
700 | * @rq: the source request | |
701 | * @what: the action | |
702 | * | |
703 | * Description: | |
704 | * Records an action against a request. Will log the bio offset + size. | |
705 | * | |
706 | **/ | |
707 | static void blk_add_trace_rq(struct request_queue *q, struct request *rq, | |
805f6b5e | 708 | u32 what) |
5f3ea37c ACM |
709 | { |
710 | struct blk_trace *bt = q->blk_trace; | |
5f3ea37c ACM |
711 | |
712 | if (likely(!bt)) | |
713 | return; | |
714 | ||
33659ebb | 715 | if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { |
5f3ea37c | 716 | what |= BLK_TC_ACT(BLK_TC_PC); |
805f6b5e | 717 | __blk_add_trace(bt, 0, blk_rq_bytes(rq), rq->cmd_flags, |
2e46e8b2 | 718 | what, rq->errors, rq->cmd_len, rq->cmd); |
5f3ea37c ACM |
719 | } else { |
720 | what |= BLK_TC_ACT(BLK_TC_FS); | |
805f6b5e TM |
721 | __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), |
722 | rq->cmd_flags, what, rq->errors, 0, NULL); | |
5f3ea37c ACM |
723 | } |
724 | } | |
725 | ||
38516ab5 SR |
726 | static void blk_add_trace_rq_abort(void *ignore, |
727 | struct request_queue *q, struct request *rq) | |
5f3ea37c ACM |
728 | { |
729 | blk_add_trace_rq(q, rq, BLK_TA_ABORT); | |
730 | } | |
731 | ||
38516ab5 SR |
732 | static void blk_add_trace_rq_insert(void *ignore, |
733 | struct request_queue *q, struct request *rq) | |
5f3ea37c ACM |
734 | { |
735 | blk_add_trace_rq(q, rq, BLK_TA_INSERT); | |
736 | } | |
737 | ||
38516ab5 SR |
738 | static void blk_add_trace_rq_issue(void *ignore, |
739 | struct request_queue *q, struct request *rq) | |
5f3ea37c ACM |
740 | { |
741 | blk_add_trace_rq(q, rq, BLK_TA_ISSUE); | |
742 | } | |
743 | ||
38516ab5 SR |
744 | static void blk_add_trace_rq_requeue(void *ignore, |
745 | struct request_queue *q, | |
939b3669 | 746 | struct request *rq) |
5f3ea37c ACM |
747 | { |
748 | blk_add_trace_rq(q, rq, BLK_TA_REQUEUE); | |
749 | } | |
750 | ||
38516ab5 SR |
751 | static void blk_add_trace_rq_complete(void *ignore, |
752 | struct request_queue *q, | |
939b3669 | 753 | struct request *rq) |
5f3ea37c ACM |
754 | { |
755 | blk_add_trace_rq(q, rq, BLK_TA_COMPLETE); | |
756 | } | |
757 | ||
758 | /** | |
759 | * blk_add_trace_bio - Add a trace for a bio oriented action | |
760 | * @q: queue the io is for | |
761 | * @bio: the source bio | |
762 | * @what: the action | |
797a455d | 763 | * @error: error, if any |
5f3ea37c ACM |
764 | * |
765 | * Description: | |
766 | * Records an action against a bio. Will log the bio offset + size. | |
767 | * | |
768 | **/ | |
769 | static void blk_add_trace_bio(struct request_queue *q, struct bio *bio, | |
797a455d | 770 | u32 what, int error) |
5f3ea37c ACM |
771 | { |
772 | struct blk_trace *bt = q->blk_trace; | |
773 | ||
774 | if (likely(!bt)) | |
775 | return; | |
776 | ||
797a455d JA |
777 | if (!error && !bio_flagged(bio, BIO_UPTODATE)) |
778 | error = EIO; | |
779 | ||
5f3ea37c | 780 | __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, |
797a455d | 781 | error, 0, NULL); |
5f3ea37c ACM |
782 | } |
783 | ||
38516ab5 SR |
784 | static void blk_add_trace_bio_bounce(void *ignore, |
785 | struct request_queue *q, struct bio *bio) | |
5f3ea37c | 786 | { |
797a455d | 787 | blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0); |
5f3ea37c ACM |
788 | } |
789 | ||
38516ab5 | 790 | static void blk_add_trace_bio_complete(void *ignore, |
23036f1a MD |
791 | struct request_queue *q, struct bio *bio, |
792 | int error) | |
5f3ea37c | 793 | { |
797a455d | 794 | blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error); |
5f3ea37c ACM |
795 | } |
796 | ||
38516ab5 SR |
797 | static void blk_add_trace_bio_backmerge(void *ignore, |
798 | struct request_queue *q, | |
939b3669 | 799 | struct bio *bio) |
5f3ea37c | 800 | { |
797a455d | 801 | blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0); |
5f3ea37c ACM |
802 | } |
803 | ||
38516ab5 SR |
804 | static void blk_add_trace_bio_frontmerge(void *ignore, |
805 | struct request_queue *q, | |
939b3669 | 806 | struct bio *bio) |
5f3ea37c | 807 | { |
797a455d | 808 | blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0); |
5f3ea37c ACM |
809 | } |
810 | ||
38516ab5 SR |
811 | static void blk_add_trace_bio_queue(void *ignore, |
812 | struct request_queue *q, struct bio *bio) | |
5f3ea37c | 813 | { |
797a455d | 814 | blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0); |
5f3ea37c ACM |
815 | } |
816 | ||
38516ab5 SR |
817 | static void blk_add_trace_getrq(void *ignore, |
818 | struct request_queue *q, | |
939b3669 | 819 | struct bio *bio, int rw) |
5f3ea37c ACM |
820 | { |
821 | if (bio) | |
797a455d | 822 | blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0); |
5f3ea37c ACM |
823 | else { |
824 | struct blk_trace *bt = q->blk_trace; | |
825 | ||
826 | if (bt) | |
827 | __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL); | |
828 | } | |
829 | } | |
830 | ||
831 | ||
38516ab5 SR |
832 | static void blk_add_trace_sleeprq(void *ignore, |
833 | struct request_queue *q, | |
939b3669 | 834 | struct bio *bio, int rw) |
5f3ea37c ACM |
835 | { |
836 | if (bio) | |
797a455d | 837 | blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0); |
5f3ea37c ACM |
838 | else { |
839 | struct blk_trace *bt = q->blk_trace; | |
840 | ||
841 | if (bt) | |
939b3669 ACM |
842 | __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ, |
843 | 0, 0, NULL); | |
5f3ea37c ACM |
844 | } |
845 | } | |
846 | ||
38516ab5 | 847 | static void blk_add_trace_plug(void *ignore, struct request_queue *q) |
5f3ea37c ACM |
848 | { |
849 | struct blk_trace *bt = q->blk_trace; | |
850 | ||
851 | if (bt) | |
852 | __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL); | |
853 | } | |
854 | ||
49cac01e JA |
855 | static void blk_add_trace_unplug(void *ignore, struct request_queue *q, |
856 | unsigned int depth, bool explicit) | |
5f3ea37c ACM |
857 | { |
858 | struct blk_trace *bt = q->blk_trace; | |
859 | ||
860 | if (bt) { | |
94b5eb28 | 861 | __be64 rpdu = cpu_to_be64(depth); |
49cac01e | 862 | u32 what; |
5f3ea37c | 863 | |
49cac01e JA |
864 | if (explicit) |
865 | what = BLK_TA_UNPLUG_IO; | |
866 | else | |
867 | what = BLK_TA_UNPLUG_TIMER; | |
868 | ||
869 | __blk_add_trace(bt, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu); | |
5f3ea37c ACM |
870 | } |
871 | } | |
872 | ||
38516ab5 SR |
873 | static void blk_add_trace_split(void *ignore, |
874 | struct request_queue *q, struct bio *bio, | |
5f3ea37c ACM |
875 | unsigned int pdu) |
876 | { | |
877 | struct blk_trace *bt = q->blk_trace; | |
878 | ||
879 | if (bt) { | |
880 | __be64 rpdu = cpu_to_be64(pdu); | |
881 | ||
882 | __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, | |
883 | BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE), | |
884 | sizeof(rpdu), &rpdu); | |
885 | } | |
886 | } | |
887 | ||
888 | /** | |
d07335e5 | 889 | * blk_add_trace_bio_remap - Add a trace for a bio-remap operation |
546cf44a | 890 | * @ignore: trace callback data parameter (not used) |
5f3ea37c ACM |
891 | * @q: queue the io is for |
892 | * @bio: the source bio | |
893 | * @dev: target device | |
a42aaa3b | 894 | * @from: source sector |
5f3ea37c ACM |
895 | * |
896 | * Description: | |
897 | * Device mapper or raid target sometimes need to split a bio because | |
898 | * it spans a stripe (or similar). Add a trace for that action. | |
899 | * | |
900 | **/ | |
d07335e5 MS |
901 | static void blk_add_trace_bio_remap(void *ignore, |
902 | struct request_queue *q, struct bio *bio, | |
903 | dev_t dev, sector_t from) | |
5f3ea37c ACM |
904 | { |
905 | struct blk_trace *bt = q->blk_trace; | |
906 | struct blk_io_trace_remap r; | |
907 | ||
908 | if (likely(!bt)) | |
909 | return; | |
910 | ||
a42aaa3b AB |
911 | r.device_from = cpu_to_be32(dev); |
912 | r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev); | |
913 | r.sector_from = cpu_to_be64(from); | |
5f3ea37c | 914 | |
22a7c31a AB |
915 | __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, |
916 | BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), | |
917 | sizeof(r), &r); | |
5f3ea37c ACM |
918 | } |
919 | ||
b0da3f0d JN |
920 | /** |
921 | * blk_add_trace_rq_remap - Add a trace for a request-remap operation | |
546cf44a | 922 | * @ignore: trace callback data parameter (not used) |
b0da3f0d JN |
923 | * @q: queue the io is for |
924 | * @rq: the source request | |
925 | * @dev: target device | |
926 | * @from: source sector | |
927 | * | |
928 | * Description: | |
929 | * Device mapper remaps request to other devices. | |
930 | * Add a trace for that action. | |
931 | * | |
932 | **/ | |
38516ab5 SR |
933 | static void blk_add_trace_rq_remap(void *ignore, |
934 | struct request_queue *q, | |
b0da3f0d JN |
935 | struct request *rq, dev_t dev, |
936 | sector_t from) | |
937 | { | |
938 | struct blk_trace *bt = q->blk_trace; | |
939 | struct blk_io_trace_remap r; | |
940 | ||
941 | if (likely(!bt)) | |
942 | return; | |
943 | ||
944 | r.device_from = cpu_to_be32(dev); | |
945 | r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); | |
946 | r.sector_from = cpu_to_be64(from); | |
947 | ||
948 | __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), | |
949 | rq_data_dir(rq), BLK_TA_REMAP, !!rq->errors, | |
950 | sizeof(r), &r); | |
951 | } | |
952 | ||
5f3ea37c ACM |
953 | /** |
954 | * blk_add_driver_data - Add binary message with driver-specific data | |
955 | * @q: queue the io is for | |
956 | * @rq: io request | |
957 | * @data: driver-specific data | |
958 | * @len: length of driver-specific data | |
959 | * | |
960 | * Description: | |
961 | * Some drivers might want to write driver-specific data per request. | |
962 | * | |
963 | **/ | |
964 | void blk_add_driver_data(struct request_queue *q, | |
965 | struct request *rq, | |
966 | void *data, size_t len) | |
967 | { | |
968 | struct blk_trace *bt = q->blk_trace; | |
969 | ||
970 | if (likely(!bt)) | |
971 | return; | |
972 | ||
33659ebb | 973 | if (rq->cmd_type == REQ_TYPE_BLOCK_PC) |
2e46e8b2 TH |
974 | __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, |
975 | BLK_TA_DRV_DATA, rq->errors, len, data); | |
5f3ea37c | 976 | else |
2e46e8b2 TH |
977 | __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, |
978 | BLK_TA_DRV_DATA, rq->errors, len, data); | |
5f3ea37c ACM |
979 | } |
980 | EXPORT_SYMBOL_GPL(blk_add_driver_data); | |
981 | ||
3c289ba7 | 982 | static void blk_register_tracepoints(void) |
5f3ea37c ACM |
983 | { |
984 | int ret; | |
985 | ||
38516ab5 | 986 | ret = register_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); |
5f3ea37c | 987 | WARN_ON(ret); |
38516ab5 | 988 | ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); |
5f3ea37c | 989 | WARN_ON(ret); |
38516ab5 | 990 | ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); |
5f3ea37c | 991 | WARN_ON(ret); |
38516ab5 | 992 | ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); |
5f3ea37c | 993 | WARN_ON(ret); |
38516ab5 | 994 | ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); |
5f3ea37c | 995 | WARN_ON(ret); |
38516ab5 | 996 | ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); |
5f3ea37c | 997 | WARN_ON(ret); |
38516ab5 | 998 | ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); |
5f3ea37c | 999 | WARN_ON(ret); |
38516ab5 | 1000 | ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); |
5f3ea37c | 1001 | WARN_ON(ret); |
38516ab5 | 1002 | ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); |
5f3ea37c | 1003 | WARN_ON(ret); |
38516ab5 | 1004 | ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); |
5f3ea37c | 1005 | WARN_ON(ret); |
38516ab5 | 1006 | ret = register_trace_block_getrq(blk_add_trace_getrq, NULL); |
5f3ea37c | 1007 | WARN_ON(ret); |
38516ab5 | 1008 | ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); |
5f3ea37c | 1009 | WARN_ON(ret); |
38516ab5 | 1010 | ret = register_trace_block_plug(blk_add_trace_plug, NULL); |
5f3ea37c | 1011 | WARN_ON(ret); |
49cac01e | 1012 | ret = register_trace_block_unplug(blk_add_trace_unplug, NULL); |
5f3ea37c | 1013 | WARN_ON(ret); |
38516ab5 | 1014 | ret = register_trace_block_split(blk_add_trace_split, NULL); |
5f3ea37c | 1015 | WARN_ON(ret); |
d07335e5 | 1016 | ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); |
5f3ea37c | 1017 | WARN_ON(ret); |
38516ab5 | 1018 | ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); |
b0da3f0d | 1019 | WARN_ON(ret); |
5f3ea37c ACM |
1020 | } |
1021 | ||
1022 | static void blk_unregister_tracepoints(void) | |
1023 | { | |
38516ab5 | 1024 | unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); |
d07335e5 | 1025 | unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); |
38516ab5 | 1026 | unregister_trace_block_split(blk_add_trace_split, NULL); |
49cac01e | 1027 | unregister_trace_block_unplug(blk_add_trace_unplug, NULL); |
38516ab5 SR |
1028 | unregister_trace_block_plug(blk_add_trace_plug, NULL); |
1029 | unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); | |
1030 | unregister_trace_block_getrq(blk_add_trace_getrq, NULL); | |
1031 | unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); | |
1032 | unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); | |
1033 | unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); | |
1034 | unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); | |
1035 | unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); | |
1036 | unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); | |
1037 | unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); | |
1038 | unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); | |
1039 | unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); | |
1040 | unregister_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); | |
5f3ea37c ACM |
1041 | |
1042 | tracepoint_synchronize_unregister(); | |
1043 | } | |
c71a8961 ACM |
1044 | |
1045 | /* | |
1046 | * struct blk_io_tracer formatting routines | |
1047 | */ | |
1048 | ||
1049 | static void fill_rwbs(char *rwbs, const struct blk_io_trace *t) | |
1050 | { | |
157f9c00 | 1051 | int i = 0; |
65796348 | 1052 | int tc = t->action >> BLK_TC_SHIFT; |
157f9c00 | 1053 | |
18cea459 LZ |
1054 | if (t->action == BLK_TN_MESSAGE) { |
1055 | rwbs[i++] = 'N'; | |
1056 | goto out; | |
1057 | } | |
1058 | ||
c09c47ca NK |
1059 | if (tc & BLK_TC_FLUSH) |
1060 | rwbs[i++] = 'F'; | |
1061 | ||
65796348 | 1062 | if (tc & BLK_TC_DISCARD) |
157f9c00 | 1063 | rwbs[i++] = 'D'; |
65796348 | 1064 | else if (tc & BLK_TC_WRITE) |
157f9c00 ACM |
1065 | rwbs[i++] = 'W'; |
1066 | else if (t->bytes) | |
1067 | rwbs[i++] = 'R'; | |
1068 | else | |
1069 | rwbs[i++] = 'N'; | |
1070 | ||
c09c47ca NK |
1071 | if (tc & BLK_TC_FUA) |
1072 | rwbs[i++] = 'F'; | |
65796348 | 1073 | if (tc & BLK_TC_AHEAD) |
157f9c00 | 1074 | rwbs[i++] = 'A'; |
65796348 | 1075 | if (tc & BLK_TC_SYNC) |
157f9c00 | 1076 | rwbs[i++] = 'S'; |
65796348 | 1077 | if (tc & BLK_TC_META) |
157f9c00 | 1078 | rwbs[i++] = 'M'; |
18cea459 | 1079 | out: |
157f9c00 | 1080 | rwbs[i] = '\0'; |
c71a8961 ACM |
1081 | } |
1082 | ||
1083 | static inline | |
1084 | const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) | |
1085 | { | |
1086 | return (const struct blk_io_trace *)ent; | |
1087 | } | |
1088 | ||
1089 | static inline const void *pdu_start(const struct trace_entry *ent) | |
1090 | { | |
1091 | return te_blk_io_trace(ent) + 1; | |
1092 | } | |
1093 | ||
66de7792 LZ |
1094 | static inline u32 t_action(const struct trace_entry *ent) |
1095 | { | |
1096 | return te_blk_io_trace(ent)->action; | |
1097 | } | |
1098 | ||
1099 | static inline u32 t_bytes(const struct trace_entry *ent) | |
1100 | { | |
1101 | return te_blk_io_trace(ent)->bytes; | |
1102 | } | |
1103 | ||
c71a8961 ACM |
1104 | static inline u32 t_sec(const struct trace_entry *ent) |
1105 | { | |
1106 | return te_blk_io_trace(ent)->bytes >> 9; | |
1107 | } | |
1108 | ||
1109 | static inline unsigned long long t_sector(const struct trace_entry *ent) | |
1110 | { | |
1111 | return te_blk_io_trace(ent)->sector; | |
1112 | } | |
1113 | ||
1114 | static inline __u16 t_error(const struct trace_entry *ent) | |
1115 | { | |
e0dc81be | 1116 | return te_blk_io_trace(ent)->error; |
c71a8961 ACM |
1117 | } |
1118 | ||
1119 | static __u64 get_pdu_int(const struct trace_entry *ent) | |
1120 | { | |
1121 | const __u64 *val = pdu_start(ent); | |
1122 | return be64_to_cpu(*val); | |
1123 | } | |
1124 | ||
1125 | static void get_pdu_remap(const struct trace_entry *ent, | |
1126 | struct blk_io_trace_remap *r) | |
1127 | { | |
1128 | const struct blk_io_trace_remap *__r = pdu_start(ent); | |
a42aaa3b | 1129 | __u64 sector_from = __r->sector_from; |
c71a8961 | 1130 | |
c71a8961 | 1131 | r->device_from = be32_to_cpu(__r->device_from); |
a42aaa3b AB |
1132 | r->device_to = be32_to_cpu(__r->device_to); |
1133 | r->sector_from = be64_to_cpu(sector_from); | |
c71a8961 ACM |
1134 | } |
1135 | ||
b6a4b0c3 LZ |
1136 | typedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act); |
1137 | ||
1138 | static int blk_log_action_classic(struct trace_iterator *iter, const char *act) | |
c71a8961 | 1139 | { |
c09c47ca | 1140 | char rwbs[RWBS_LEN]; |
35ac51bf LZ |
1141 | unsigned long long ts = iter->ts; |
1142 | unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); | |
c71a8961 | 1143 | unsigned secs = (unsigned long)ts; |
b6a4b0c3 | 1144 | const struct blk_io_trace *t = te_blk_io_trace(iter->ent); |
c71a8961 ACM |
1145 | |
1146 | fill_rwbs(rwbs, t); | |
1147 | ||
1148 | return trace_seq_printf(&iter->seq, | |
35ac51bf | 1149 | "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", |
c71a8961 | 1150 | MAJOR(t->device), MINOR(t->device), iter->cpu, |
b6a4b0c3 | 1151 | secs, nsec_rem, iter->ent->pid, act, rwbs); |
c71a8961 ACM |
1152 | } |
1153 | ||
b6a4b0c3 | 1154 | static int blk_log_action(struct trace_iterator *iter, const char *act) |
c71a8961 | 1155 | { |
c09c47ca | 1156 | char rwbs[RWBS_LEN]; |
b6a4b0c3 LZ |
1157 | const struct blk_io_trace *t = te_blk_io_trace(iter->ent); |
1158 | ||
c71a8961 | 1159 | fill_rwbs(rwbs, t); |
b6a4b0c3 | 1160 | return trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", |
c71a8961 ACM |
1161 | MAJOR(t->device), MINOR(t->device), act, rwbs); |
1162 | } | |
1163 | ||
66de7792 LZ |
1164 | static int blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent) |
1165 | { | |
04986257 | 1166 | const unsigned char *pdu_buf; |
66de7792 LZ |
1167 | int pdu_len; |
1168 | int i, end, ret; | |
1169 | ||
1170 | pdu_buf = pdu_start(ent); | |
1171 | pdu_len = te_blk_io_trace(ent)->pdu_len; | |
1172 | ||
1173 | if (!pdu_len) | |
1174 | return 1; | |
1175 | ||
1176 | /* find the last zero that needs to be printed */ | |
1177 | for (end = pdu_len - 1; end >= 0; end--) | |
1178 | if (pdu_buf[end]) | |
1179 | break; | |
1180 | end++; | |
1181 | ||
1182 | if (!trace_seq_putc(s, '(')) | |
1183 | return 0; | |
1184 | ||
1185 | for (i = 0; i < pdu_len; i++) { | |
1186 | ||
1187 | ret = trace_seq_printf(s, "%s%02x", | |
1188 | i == 0 ? "" : " ", pdu_buf[i]); | |
1189 | if (!ret) | |
1190 | return ret; | |
1191 | ||
1192 | /* | |
1193 | * stop when the rest is just zeroes and indicate so | |
1194 | * with a ".." appended | |
1195 | */ | |
1196 | if (i == end && end != pdu_len - 1) | |
1197 | return trace_seq_puts(s, " ..) "); | |
1198 | } | |
1199 | ||
1200 | return trace_seq_puts(s, ") "); | |
1201 | } | |
1202 | ||
c71a8961 ACM |
1203 | static int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent) |
1204 | { | |
4ca53085 SR |
1205 | char cmd[TASK_COMM_LEN]; |
1206 | ||
1207 | trace_find_cmdline(ent->pid, cmd); | |
c71a8961 | 1208 | |
66de7792 LZ |
1209 | if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { |
1210 | int ret; | |
1211 | ||
1212 | ret = trace_seq_printf(s, "%u ", t_bytes(ent)); | |
1213 | if (!ret) | |
1214 | return 0; | |
1215 | ret = blk_log_dump_pdu(s, ent); | |
1216 | if (!ret) | |
1217 | return 0; | |
1218 | return trace_seq_printf(s, "[%s]\n", cmd); | |
1219 | } else { | |
1220 | if (t_sec(ent)) | |
1221 | return trace_seq_printf(s, "%llu + %u [%s]\n", | |
1222 | t_sector(ent), t_sec(ent), cmd); | |
1223 | return trace_seq_printf(s, "[%s]\n", cmd); | |
1224 | } | |
c71a8961 ACM |
1225 | } |
1226 | ||
157f9c00 ACM |
1227 | static int blk_log_with_error(struct trace_seq *s, |
1228 | const struct trace_entry *ent) | |
c71a8961 | 1229 | { |
66de7792 LZ |
1230 | if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { |
1231 | int ret; | |
1232 | ||
1233 | ret = blk_log_dump_pdu(s, ent); | |
1234 | if (ret) | |
1235 | return trace_seq_printf(s, "[%d]\n", t_error(ent)); | |
1236 | return 0; | |
1237 | } else { | |
1238 | if (t_sec(ent)) | |
1239 | return trace_seq_printf(s, "%llu + %u [%d]\n", | |
1240 | t_sector(ent), | |
1241 | t_sec(ent), t_error(ent)); | |
1242 | return trace_seq_printf(s, "%llu [%d]\n", | |
1243 | t_sector(ent), t_error(ent)); | |
1244 | } | |
c71a8961 ACM |
1245 | } |
1246 | ||
1247 | static int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent) | |
1248 | { | |
a42aaa3b | 1249 | struct blk_io_trace_remap r = { .device_from = 0, }; |
c71a8961 ACM |
1250 | |
1251 | get_pdu_remap(ent, &r); | |
1252 | return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", | |
a42aaa3b AB |
1253 | t_sector(ent), t_sec(ent), |
1254 | MAJOR(r.device_from), MINOR(r.device_from), | |
1255 | (unsigned long long)r.sector_from); | |
c71a8961 ACM |
1256 | } |
1257 | ||
1258 | static int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent) | |
1259 | { | |
4ca53085 SR |
1260 | char cmd[TASK_COMM_LEN]; |
1261 | ||
1262 | trace_find_cmdline(ent->pid, cmd); | |
1263 | ||
1264 | return trace_seq_printf(s, "[%s]\n", cmd); | |
c71a8961 ACM |
1265 | } |
1266 | ||
1267 | static int blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent) | |
1268 | { | |
4ca53085 SR |
1269 | char cmd[TASK_COMM_LEN]; |
1270 | ||
1271 | trace_find_cmdline(ent->pid, cmd); | |
1272 | ||
1273 | return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent)); | |
c71a8961 ACM |
1274 | } |
1275 | ||
1276 | static int blk_log_split(struct trace_seq *s, const struct trace_entry *ent) | |
1277 | { | |
4ca53085 SR |
1278 | char cmd[TASK_COMM_LEN]; |
1279 | ||
1280 | trace_find_cmdline(ent->pid, cmd); | |
1281 | ||
c71a8961 | 1282 | return trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), |
4ca53085 | 1283 | get_pdu_int(ent), cmd); |
c71a8961 ACM |
1284 | } |
1285 | ||
18cea459 LZ |
1286 | static int blk_log_msg(struct trace_seq *s, const struct trace_entry *ent) |
1287 | { | |
1288 | int ret; | |
1289 | const struct blk_io_trace *t = te_blk_io_trace(ent); | |
1290 | ||
1291 | ret = trace_seq_putmem(s, t + 1, t->pdu_len); | |
1292 | if (ret) | |
1293 | return trace_seq_putc(s, '\n'); | |
1294 | return ret; | |
1295 | } | |
1296 | ||
c71a8961 ACM |
1297 | /* |
1298 | * struct tracer operations | |
1299 | */ | |
1300 | ||
1301 | static void blk_tracer_print_header(struct seq_file *m) | |
1302 | { | |
1303 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) | |
1304 | return; | |
1305 | seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" | |
1306 | "# | | | | | |\n"); | |
1307 | } | |
1308 | ||
1309 | static void blk_tracer_start(struct trace_array *tr) | |
1310 | { | |
ad5dd549 | 1311 | blk_tracer_enabled = true; |
c71a8961 ACM |
1312 | } |
1313 | ||
1314 | static int blk_tracer_init(struct trace_array *tr) | |
1315 | { | |
1316 | blk_tr = tr; | |
1317 | blk_tracer_start(tr); | |
c71a8961 ACM |
1318 | return 0; |
1319 | } | |
1320 | ||
1321 | static void blk_tracer_stop(struct trace_array *tr) | |
1322 | { | |
ad5dd549 | 1323 | blk_tracer_enabled = false; |
c71a8961 ACM |
1324 | } |
1325 | ||
1326 | static void blk_tracer_reset(struct trace_array *tr) | |
1327 | { | |
c71a8961 ACM |
1328 | blk_tracer_stop(tr); |
1329 | } | |
1330 | ||
e4955c99 | 1331 | static const struct { |
c71a8961 | 1332 | const char *act[2]; |
ef18012b | 1333 | int (*print)(struct trace_seq *s, const struct trace_entry *ent); |
e4955c99 | 1334 | } what2act[] = { |
ef18012b | 1335 | [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, |
c71a8961 ACM |
1336 | [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, |
1337 | [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, | |
1338 | [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, | |
1339 | [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, | |
1340 | [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, | |
1341 | [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, | |
1342 | [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, | |
1343 | [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, | |
1344 | [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, | |
49cac01e | 1345 | [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, |
c71a8961 ACM |
1346 | [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, |
1347 | [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, | |
1348 | [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, | |
1349 | [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, | |
1350 | }; | |
1351 | ||
b6a4b0c3 LZ |
1352 | static enum print_line_t print_one_line(struct trace_iterator *iter, |
1353 | bool classic) | |
c71a8961 | 1354 | { |
2c9b238e | 1355 | struct trace_seq *s = &iter->seq; |
b6a4b0c3 LZ |
1356 | const struct blk_io_trace *t; |
1357 | u16 what; | |
c71a8961 | 1358 | int ret; |
b6a4b0c3 LZ |
1359 | bool long_act; |
1360 | blk_log_action_t *log_action; | |
c71a8961 | 1361 | |
b6a4b0c3 LZ |
1362 | t = te_blk_io_trace(iter->ent); |
1363 | what = t->action & ((1 << BLK_TC_SHIFT) - 1); | |
1364 | long_act = !!(trace_flags & TRACE_ITER_VERBOSE); | |
1365 | log_action = classic ? &blk_log_action_classic : &blk_log_action; | |
08a06b83 | 1366 | |
18cea459 LZ |
1367 | if (t->action == BLK_TN_MESSAGE) { |
1368 | ret = log_action(iter, long_act ? "message" : "m"); | |
1369 | if (ret) | |
1370 | ret = blk_log_msg(s, iter->ent); | |
1371 | goto out; | |
1372 | } | |
1373 | ||
eb08f8eb | 1374 | if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) |
b78825d6 | 1375 | ret = trace_seq_printf(s, "Unknown action %x\n", what); |
c71a8961 | 1376 | else { |
b6a4b0c3 | 1377 | ret = log_action(iter, what2act[what].act[long_act]); |
c71a8961 | 1378 | if (ret) |
2c9b238e | 1379 | ret = what2act[what].print(s, iter->ent); |
c71a8961 | 1380 | } |
18cea459 | 1381 | out: |
c71a8961 ACM |
1382 | return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; |
1383 | } | |
1384 | ||
b6a4b0c3 | 1385 | static enum print_line_t blk_trace_event_print(struct trace_iterator *iter, |
a9a57763 | 1386 | int flags, struct trace_event *event) |
b6a4b0c3 | 1387 | { |
b6a4b0c3 LZ |
1388 | return print_one_line(iter, false); |
1389 | } | |
1390 | ||
08a06b83 ACM |
1391 | static int blk_trace_synthesize_old_trace(struct trace_iterator *iter) |
1392 | { | |
1393 | struct trace_seq *s = &iter->seq; | |
1394 | struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; | |
1395 | const int offset = offsetof(struct blk_io_trace, sector); | |
1396 | struct blk_io_trace old = { | |
1397 | .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, | |
6c051ce0 | 1398 | .time = iter->ts, |
08a06b83 ACM |
1399 | }; |
1400 | ||
1401 | if (!trace_seq_putmem(s, &old, offset)) | |
1402 | return 0; | |
1403 | return trace_seq_putmem(s, &t->sector, | |
1404 | sizeof(old) - offset + t->pdu_len); | |
1405 | } | |
1406 | ||
ae7462b4 | 1407 | static enum print_line_t |
a9a57763 SR |
1408 | blk_trace_event_print_binary(struct trace_iterator *iter, int flags, |
1409 | struct trace_event *event) | |
08a06b83 ACM |
1410 | { |
1411 | return blk_trace_synthesize_old_trace(iter) ? | |
1412 | TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; | |
1413 | } | |
1414 | ||
c71a8961 ACM |
1415 | static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) |
1416 | { | |
c71a8961 ACM |
1417 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) |
1418 | return TRACE_TYPE_UNHANDLED; | |
1419 | ||
b6a4b0c3 | 1420 | return print_one_line(iter, true); |
c71a8961 ACM |
1421 | } |
1422 | ||
f3948f88 LZ |
1423 | static int blk_tracer_set_flag(u32 old_flags, u32 bit, int set) |
1424 | { | |
1425 | /* don't output context-info for blk_classic output */ | |
1426 | if (bit == TRACE_BLK_OPT_CLASSIC) { | |
1427 | if (set) | |
1428 | trace_flags &= ~TRACE_ITER_CONTEXT_INFO; | |
1429 | else | |
1430 | trace_flags |= TRACE_ITER_CONTEXT_INFO; | |
1431 | } | |
1432 | return 0; | |
1433 | } | |
1434 | ||
c71a8961 ACM |
1435 | static struct tracer blk_tracer __read_mostly = { |
1436 | .name = "blk", | |
1437 | .init = blk_tracer_init, | |
1438 | .reset = blk_tracer_reset, | |
1439 | .start = blk_tracer_start, | |
1440 | .stop = blk_tracer_stop, | |
1441 | .print_header = blk_tracer_print_header, | |
1442 | .print_line = blk_tracer_print_line, | |
1443 | .flags = &blk_tracer_flags, | |
f3948f88 | 1444 | .set_flag = blk_tracer_set_flag, |
c71a8961 ACM |
1445 | }; |
1446 | ||
a9a57763 | 1447 | static struct trace_event_functions trace_blk_event_funcs = { |
c71a8961 | 1448 | .trace = blk_trace_event_print, |
08a06b83 | 1449 | .binary = blk_trace_event_print_binary, |
c71a8961 ACM |
1450 | }; |
1451 | ||
a9a57763 SR |
1452 | static struct trace_event trace_blk_event = { |
1453 | .type = TRACE_BLK, | |
1454 | .funcs = &trace_blk_event_funcs, | |
1455 | }; | |
1456 | ||
c71a8961 ACM |
1457 | static int __init init_blk_tracer(void) |
1458 | { | |
1459 | if (!register_ftrace_event(&trace_blk_event)) { | |
1460 | pr_warning("Warning: could not register block events\n"); | |
1461 | return 1; | |
1462 | } | |
1463 | ||
1464 | if (register_tracer(&blk_tracer) != 0) { | |
1465 | pr_warning("Warning: could not register the block tracer\n"); | |
1466 | unregister_ftrace_event(&trace_blk_event); | |
1467 | return 1; | |
1468 | } | |
1469 | ||
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | device_initcall(init_blk_tracer); | |
1474 | ||
1475 | static int blk_trace_remove_queue(struct request_queue *q) | |
1476 | { | |
1477 | struct blk_trace *bt; | |
1478 | ||
1479 | bt = xchg(&q->blk_trace, NULL); | |
1480 | if (bt == NULL) | |
1481 | return -EINVAL; | |
1482 | ||
17ba97e3 LZ |
1483 | if (atomic_dec_and_test(&blk_probes_ref)) |
1484 | blk_unregister_tracepoints(); | |
1485 | ||
ad5dd549 | 1486 | blk_trace_free(bt); |
c71a8961 ACM |
1487 | return 0; |
1488 | } | |
1489 | ||
1490 | /* | |
1491 | * Setup everything required to start tracing | |
1492 | */ | |
9908c309 LZ |
1493 | static int blk_trace_setup_queue(struct request_queue *q, |
1494 | struct block_device *bdev) | |
c71a8961 ACM |
1495 | { |
1496 | struct blk_trace *old_bt, *bt = NULL; | |
18cea459 | 1497 | int ret = -ENOMEM; |
c71a8961 | 1498 | |
c71a8961 ACM |
1499 | bt = kzalloc(sizeof(*bt), GFP_KERNEL); |
1500 | if (!bt) | |
15152e44 | 1501 | return -ENOMEM; |
c71a8961 | 1502 | |
18cea459 LZ |
1503 | bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); |
1504 | if (!bt->msg_data) | |
1505 | goto free_bt; | |
1506 | ||
9908c309 | 1507 | bt->dev = bdev->bd_dev; |
c71a8961 | 1508 | bt->act_mask = (u16)-1; |
9908c309 LZ |
1509 | |
1510 | blk_trace_setup_lba(bt, bdev); | |
c71a8961 ACM |
1511 | |
1512 | old_bt = xchg(&q->blk_trace, bt); | |
1513 | if (old_bt != NULL) { | |
1514 | (void)xchg(&q->blk_trace, old_bt); | |
18cea459 LZ |
1515 | ret = -EBUSY; |
1516 | goto free_bt; | |
c71a8961 | 1517 | } |
15152e44 | 1518 | |
17ba97e3 LZ |
1519 | if (atomic_inc_return(&blk_probes_ref) == 1) |
1520 | blk_register_tracepoints(); | |
c71a8961 | 1521 | return 0; |
18cea459 LZ |
1522 | |
1523 | free_bt: | |
1524 | blk_trace_free(bt); | |
1525 | return ret; | |
c71a8961 ACM |
1526 | } |
1527 | ||
1528 | /* | |
1529 | * sysfs interface to enable and configure tracing | |
1530 | */ | |
1531 | ||
c71a8961 ACM |
1532 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, |
1533 | struct device_attribute *attr, | |
1534 | char *buf); | |
1535 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | |
1536 | struct device_attribute *attr, | |
1537 | const char *buf, size_t count); | |
1538 | #define BLK_TRACE_DEVICE_ATTR(_name) \ | |
1539 | DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ | |
1540 | sysfs_blk_trace_attr_show, \ | |
1541 | sysfs_blk_trace_attr_store) | |
1542 | ||
cd649b8b | 1543 | static BLK_TRACE_DEVICE_ATTR(enable); |
c71a8961 ACM |
1544 | static BLK_TRACE_DEVICE_ATTR(act_mask); |
1545 | static BLK_TRACE_DEVICE_ATTR(pid); | |
1546 | static BLK_TRACE_DEVICE_ATTR(start_lba); | |
1547 | static BLK_TRACE_DEVICE_ATTR(end_lba); | |
1548 | ||
1549 | static struct attribute *blk_trace_attrs[] = { | |
1550 | &dev_attr_enable.attr, | |
1551 | &dev_attr_act_mask.attr, | |
1552 | &dev_attr_pid.attr, | |
1553 | &dev_attr_start_lba.attr, | |
1554 | &dev_attr_end_lba.attr, | |
1555 | NULL | |
1556 | }; | |
1557 | ||
1558 | struct attribute_group blk_trace_attr_group = { | |
1559 | .name = "trace", | |
1560 | .attrs = blk_trace_attrs, | |
1561 | }; | |
1562 | ||
09341997 LZ |
1563 | static const struct { |
1564 | int mask; | |
1565 | const char *str; | |
1566 | } mask_maps[] = { | |
1567 | { BLK_TC_READ, "read" }, | |
1568 | { BLK_TC_WRITE, "write" }, | |
c09c47ca | 1569 | { BLK_TC_FLUSH, "flush" }, |
09341997 LZ |
1570 | { BLK_TC_SYNC, "sync" }, |
1571 | { BLK_TC_QUEUE, "queue" }, | |
1572 | { BLK_TC_REQUEUE, "requeue" }, | |
1573 | { BLK_TC_ISSUE, "issue" }, | |
1574 | { BLK_TC_COMPLETE, "complete" }, | |
1575 | { BLK_TC_FS, "fs" }, | |
1576 | { BLK_TC_PC, "pc" }, | |
1577 | { BLK_TC_AHEAD, "ahead" }, | |
1578 | { BLK_TC_META, "meta" }, | |
1579 | { BLK_TC_DISCARD, "discard" }, | |
1580 | { BLK_TC_DRV_DATA, "drv_data" }, | |
c09c47ca | 1581 | { BLK_TC_FUA, "fua" }, |
09341997 LZ |
1582 | }; |
1583 | ||
1584 | static int blk_trace_str2mask(const char *str) | |
c71a8961 | 1585 | { |
09341997 | 1586 | int i; |
c71a8961 | 1587 | int mask = 0; |
9eb85125 | 1588 | char *buf, *s, *token; |
c71a8961 | 1589 | |
9eb85125 LZ |
1590 | buf = kstrdup(str, GFP_KERNEL); |
1591 | if (buf == NULL) | |
c71a8961 | 1592 | return -ENOMEM; |
9eb85125 | 1593 | s = strstrip(buf); |
c71a8961 ACM |
1594 | |
1595 | while (1) { | |
09341997 LZ |
1596 | token = strsep(&s, ","); |
1597 | if (token == NULL) | |
c71a8961 ACM |
1598 | break; |
1599 | ||
09341997 LZ |
1600 | if (*token == '\0') |
1601 | continue; | |
1602 | ||
1603 | for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { | |
1604 | if (strcasecmp(token, mask_maps[i].str) == 0) { | |
1605 | mask |= mask_maps[i].mask; | |
1606 | break; | |
1607 | } | |
1608 | } | |
1609 | if (i == ARRAY_SIZE(mask_maps)) { | |
1610 | mask = -EINVAL; | |
1611 | break; | |
1612 | } | |
c71a8961 | 1613 | } |
9eb85125 | 1614 | kfree(buf); |
c71a8961 ACM |
1615 | |
1616 | return mask; | |
1617 | } | |
1618 | ||
09341997 LZ |
1619 | static ssize_t blk_trace_mask2str(char *buf, int mask) |
1620 | { | |
1621 | int i; | |
1622 | char *p = buf; | |
1623 | ||
1624 | for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { | |
1625 | if (mask & mask_maps[i].mask) { | |
1626 | p += sprintf(p, "%s%s", | |
1627 | (p == buf) ? "" : ",", mask_maps[i].str); | |
1628 | } | |
1629 | } | |
1630 | *p++ = '\n'; | |
1631 | ||
1632 | return p - buf; | |
1633 | } | |
1634 | ||
b125130b LZ |
1635 | static struct request_queue *blk_trace_get_queue(struct block_device *bdev) |
1636 | { | |
1637 | if (bdev->bd_disk == NULL) | |
1638 | return NULL; | |
1639 | ||
1640 | return bdev_get_queue(bdev); | |
1641 | } | |
1642 | ||
c71a8961 ACM |
1643 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, |
1644 | struct device_attribute *attr, | |
1645 | char *buf) | |
1646 | { | |
1647 | struct hd_struct *p = dev_to_part(dev); | |
1648 | struct request_queue *q; | |
1649 | struct block_device *bdev; | |
1650 | ssize_t ret = -ENXIO; | |
1651 | ||
c71a8961 ACM |
1652 | bdev = bdget(part_devt(p)); |
1653 | if (bdev == NULL) | |
01b284f9 | 1654 | goto out; |
c71a8961 | 1655 | |
b125130b | 1656 | q = blk_trace_get_queue(bdev); |
c71a8961 ACM |
1657 | if (q == NULL) |
1658 | goto out_bdput; | |
b125130b | 1659 | |
c71a8961 | 1660 | mutex_lock(&bdev->bd_mutex); |
cd649b8b LZ |
1661 | |
1662 | if (attr == &dev_attr_enable) { | |
1663 | ret = sprintf(buf, "%u\n", !!q->blk_trace); | |
1664 | goto out_unlock_bdev; | |
1665 | } | |
1666 | ||
c71a8961 ACM |
1667 | if (q->blk_trace == NULL) |
1668 | ret = sprintf(buf, "disabled\n"); | |
1669 | else if (attr == &dev_attr_act_mask) | |
09341997 | 1670 | ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); |
c71a8961 ACM |
1671 | else if (attr == &dev_attr_pid) |
1672 | ret = sprintf(buf, "%u\n", q->blk_trace->pid); | |
1673 | else if (attr == &dev_attr_start_lba) | |
1674 | ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); | |
1675 | else if (attr == &dev_attr_end_lba) | |
1676 | ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); | |
cd649b8b LZ |
1677 | |
1678 | out_unlock_bdev: | |
c71a8961 ACM |
1679 | mutex_unlock(&bdev->bd_mutex); |
1680 | out_bdput: | |
1681 | bdput(bdev); | |
01b284f9 | 1682 | out: |
c71a8961 ACM |
1683 | return ret; |
1684 | } | |
1685 | ||
1686 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | |
1687 | struct device_attribute *attr, | |
1688 | const char *buf, size_t count) | |
1689 | { | |
1690 | struct block_device *bdev; | |
1691 | struct request_queue *q; | |
1692 | struct hd_struct *p; | |
1693 | u64 value; | |
09341997 | 1694 | ssize_t ret = -EINVAL; |
c71a8961 ACM |
1695 | |
1696 | if (count == 0) | |
1697 | goto out; | |
1698 | ||
1699 | if (attr == &dev_attr_act_mask) { | |
1700 | if (sscanf(buf, "%llx", &value) != 1) { | |
1701 | /* Assume it is a list of trace category names */ | |
09341997 LZ |
1702 | ret = blk_trace_str2mask(buf); |
1703 | if (ret < 0) | |
c71a8961 | 1704 | goto out; |
09341997 | 1705 | value = ret; |
c71a8961 ACM |
1706 | } |
1707 | } else if (sscanf(buf, "%llu", &value) != 1) | |
1708 | goto out; | |
1709 | ||
09341997 LZ |
1710 | ret = -ENXIO; |
1711 | ||
c71a8961 ACM |
1712 | p = dev_to_part(dev); |
1713 | bdev = bdget(part_devt(p)); | |
1714 | if (bdev == NULL) | |
01b284f9 | 1715 | goto out; |
c71a8961 | 1716 | |
b125130b | 1717 | q = blk_trace_get_queue(bdev); |
c71a8961 ACM |
1718 | if (q == NULL) |
1719 | goto out_bdput; | |
1720 | ||
1721 | mutex_lock(&bdev->bd_mutex); | |
cd649b8b LZ |
1722 | |
1723 | if (attr == &dev_attr_enable) { | |
1724 | if (value) | |
9908c309 | 1725 | ret = blk_trace_setup_queue(q, bdev); |
cd649b8b LZ |
1726 | else |
1727 | ret = blk_trace_remove_queue(q); | |
1728 | goto out_unlock_bdev; | |
1729 | } | |
1730 | ||
c71a8961 ACM |
1731 | ret = 0; |
1732 | if (q->blk_trace == NULL) | |
9908c309 | 1733 | ret = blk_trace_setup_queue(q, bdev); |
c71a8961 ACM |
1734 | |
1735 | if (ret == 0) { | |
1736 | if (attr == &dev_attr_act_mask) | |
1737 | q->blk_trace->act_mask = value; | |
1738 | else if (attr == &dev_attr_pid) | |
1739 | q->blk_trace->pid = value; | |
1740 | else if (attr == &dev_attr_start_lba) | |
1741 | q->blk_trace->start_lba = value; | |
1742 | else if (attr == &dev_attr_end_lba) | |
1743 | q->blk_trace->end_lba = value; | |
c71a8961 | 1744 | } |
cd649b8b LZ |
1745 | |
1746 | out_unlock_bdev: | |
c71a8961 ACM |
1747 | mutex_unlock(&bdev->bd_mutex); |
1748 | out_bdput: | |
1749 | bdput(bdev); | |
c71a8961 | 1750 | out: |
cd649b8b | 1751 | return ret ? ret : count; |
c71a8961 | 1752 | } |
cd649b8b | 1753 | |
1d54ad6d LZ |
1754 | int blk_trace_init_sysfs(struct device *dev) |
1755 | { | |
1756 | return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); | |
1757 | } | |
1758 | ||
48c0d4d4 ZK |
1759 | void blk_trace_remove_sysfs(struct device *dev) |
1760 | { | |
1761 | sysfs_remove_group(&dev->kobj, &blk_trace_attr_group); | |
1762 | } | |
1763 | ||
55782138 LZ |
1764 | #endif /* CONFIG_BLK_DEV_IO_TRACE */ |
1765 | ||
1766 | #ifdef CONFIG_EVENT_TRACING | |
1767 | ||
1768 | void blk_dump_cmd(char *buf, struct request *rq) | |
1769 | { | |
1770 | int i, end; | |
1771 | int len = rq->cmd_len; | |
1772 | unsigned char *cmd = rq->cmd; | |
1773 | ||
33659ebb | 1774 | if (rq->cmd_type != REQ_TYPE_BLOCK_PC) { |
55782138 LZ |
1775 | buf[0] = '\0'; |
1776 | return; | |
1777 | } | |
1778 | ||
1779 | for (end = len - 1; end >= 0; end--) | |
1780 | if (cmd[end]) | |
1781 | break; | |
1782 | end++; | |
1783 | ||
1784 | for (i = 0; i < len; i++) { | |
1785 | buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]); | |
1786 | if (i == end && end != len - 1) { | |
1787 | sprintf(buf, " .."); | |
1788 | break; | |
1789 | } | |
1790 | } | |
1791 | } | |
1792 | ||
1793 | void blk_fill_rwbs(char *rwbs, u32 rw, int bytes) | |
1794 | { | |
1795 | int i = 0; | |
1796 | ||
c09c47ca NK |
1797 | if (rw & REQ_FLUSH) |
1798 | rwbs[i++] = 'F'; | |
1799 | ||
55782138 LZ |
1800 | if (rw & WRITE) |
1801 | rwbs[i++] = 'W'; | |
7b6d91da | 1802 | else if (rw & REQ_DISCARD) |
55782138 LZ |
1803 | rwbs[i++] = 'D'; |
1804 | else if (bytes) | |
1805 | rwbs[i++] = 'R'; | |
1806 | else | |
1807 | rwbs[i++] = 'N'; | |
1808 | ||
c09c47ca NK |
1809 | if (rw & REQ_FUA) |
1810 | rwbs[i++] = 'F'; | |
7b6d91da | 1811 | if (rw & REQ_RAHEAD) |
55782138 | 1812 | rwbs[i++] = 'A'; |
7b6d91da | 1813 | if (rw & REQ_SYNC) |
55782138 | 1814 | rwbs[i++] = 'S'; |
7b6d91da | 1815 | if (rw & REQ_META) |
55782138 | 1816 | rwbs[i++] = 'M'; |
8d57a98c AH |
1817 | if (rw & REQ_SECURE) |
1818 | rwbs[i++] = 'E'; | |
55782138 LZ |
1819 | |
1820 | rwbs[i] = '\0'; | |
1821 | } | |
1822 | ||
55782138 LZ |
1823 | #endif /* CONFIG_EVENT_TRACING */ |
1824 |