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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> |
6e5fdeed | 26 | #include <linux/export.h> |
be1c6341 | 27 | #include <linux/time.h> |
939b3669 | 28 | #include <linux/uaccess.h> |
a404d557 | 29 | #include <linux/list.h> |
ca1136c9 | 30 | #include <linux/blk-cgroup.h> |
55782138 | 31 | |
18fbda91 OS |
32 | #include "../../block/blk.h" |
33 | ||
55782138 LZ |
34 | #include <trace/events/block.h> |
35 | ||
2db270a8 | 36 | #include "trace_output.h" |
2056a782 | 37 | |
55782138 LZ |
38 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
39 | ||
2056a782 JA |
40 | static unsigned int blktrace_seq __read_mostly = 1; |
41 | ||
c71a8961 | 42 | static struct trace_array *blk_tr; |
5006ea73 | 43 | static bool blk_tracer_enabled __read_mostly; |
c71a8961 | 44 | |
a404d557 JK |
45 | static LIST_HEAD(running_trace_list); |
46 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(running_trace_lock); | |
47 | ||
c71a8961 | 48 | /* Select an alternative, minimalistic output than the original one */ |
ef18012b | 49 | #define TRACE_BLK_OPT_CLASSIC 0x1 |
ca1136c9 | 50 | #define TRACE_BLK_OPT_CGROUP 0x2 |
69fd5c39 | 51 | #define TRACE_BLK_OPT_CGNAME 0x4 |
c71a8961 ACM |
52 | |
53 | static struct tracer_opt blk_tracer_opts[] = { | |
54 | /* Default disable the minimalistic output */ | |
157f9c00 | 55 | { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) }, |
ca1136c9 SL |
56 | #ifdef CONFIG_BLK_CGROUP |
57 | { TRACER_OPT(blk_cgroup, TRACE_BLK_OPT_CGROUP) }, | |
69fd5c39 | 58 | { TRACER_OPT(blk_cgname, TRACE_BLK_OPT_CGNAME) }, |
ca1136c9 | 59 | #endif |
c71a8961 ACM |
60 | { } |
61 | }; | |
62 | ||
63 | static struct tracer_flags blk_tracer_flags = { | |
64 | .val = 0, | |
65 | .opts = blk_tracer_opts, | |
66 | }; | |
67 | ||
5f3ea37c | 68 | /* Global reference count of probes */ |
a6da0024 JA |
69 | static DEFINE_MUTEX(blk_probe_mutex); |
70 | static int blk_probes_ref; | |
5f3ea37c | 71 | |
3c289ba7 | 72 | static void blk_register_tracepoints(void); |
5f3ea37c ACM |
73 | static void blk_unregister_tracepoints(void); |
74 | ||
be1c6341 OK |
75 | /* |
76 | * Send out a notify message. | |
77 | */ | |
a863055b | 78 | static void trace_note(struct blk_trace *bt, pid_t pid, int action, |
ca1136c9 SL |
79 | const void *data, size_t len, |
80 | union kernfs_node_id *cgid) | |
be1c6341 OK |
81 | { |
82 | struct blk_io_trace *t; | |
18cea459 | 83 | struct ring_buffer_event *event = NULL; |
e77405ad | 84 | struct ring_buffer *buffer = NULL; |
18cea459 LZ |
85 | int pc = 0; |
86 | int cpu = smp_processor_id(); | |
87 | bool blk_tracer = blk_tracer_enabled; | |
ca1136c9 | 88 | ssize_t cgid_len = cgid ? sizeof(*cgid) : 0; |
18cea459 LZ |
89 | |
90 | if (blk_tracer) { | |
12883efb | 91 | buffer = blk_tr->trace_buffer.buffer; |
18cea459 | 92 | pc = preempt_count(); |
e77405ad | 93 | event = trace_buffer_lock_reserve(buffer, TRACE_BLK, |
ca1136c9 | 94 | sizeof(*t) + len + cgid_len, |
18cea459 LZ |
95 | 0, pc); |
96 | if (!event) | |
97 | return; | |
98 | t = ring_buffer_event_data(event); | |
99 | goto record_it; | |
100 | } | |
be1c6341 | 101 | |
c71a8961 ACM |
102 | if (!bt->rchan) |
103 | return; | |
104 | ||
ca1136c9 | 105 | t = relay_reserve(bt->rchan, sizeof(*t) + len + cgid_len); |
d3d9d2a5 | 106 | if (t) { |
d3d9d2a5 | 107 | t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; |
2997c8c4 | 108 | t->time = ktime_to_ns(ktime_get()); |
18cea459 | 109 | record_it: |
d3d9d2a5 | 110 | t->device = bt->dev; |
ca1136c9 | 111 | t->action = action | (cgid ? __BLK_TN_CGROUP : 0); |
d3d9d2a5 JA |
112 | t->pid = pid; |
113 | t->cpu = cpu; | |
ca1136c9 SL |
114 | t->pdu_len = len + cgid_len; |
115 | if (cgid) | |
116 | memcpy((void *)t + sizeof(*t), cgid, cgid_len); | |
117 | memcpy((void *) t + sizeof(*t) + cgid_len, data, len); | |
18cea459 LZ |
118 | |
119 | if (blk_tracer) | |
b7f0c959 | 120 | trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc); |
d3d9d2a5 | 121 | } |
be1c6341 OK |
122 | } |
123 | ||
2056a782 JA |
124 | /* |
125 | * Send out a notify for this process, if we haven't done so since a trace | |
126 | * started | |
127 | */ | |
a404d557 | 128 | static void trace_note_tsk(struct task_struct *tsk) |
2056a782 | 129 | { |
a404d557 JK |
130 | unsigned long flags; |
131 | struct blk_trace *bt; | |
132 | ||
a863055b | 133 | tsk->btrace_seq = blktrace_seq; |
a404d557 JK |
134 | spin_lock_irqsave(&running_trace_lock, flags); |
135 | list_for_each_entry(bt, &running_trace_list, running_list) { | |
136 | trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, | |
ca1136c9 | 137 | sizeof(tsk->comm), NULL); |
a404d557 JK |
138 | } |
139 | spin_unlock_irqrestore(&running_trace_lock, flags); | |
be1c6341 | 140 | } |
2056a782 | 141 | |
be1c6341 OK |
142 | static void trace_note_time(struct blk_trace *bt) |
143 | { | |
59a37f8b | 144 | struct timespec64 now; |
be1c6341 OK |
145 | unsigned long flags; |
146 | u32 words[2]; | |
147 | ||
59a37f8b AB |
148 | /* need to check user space to see if this breaks in y2038 or y2106 */ |
149 | ktime_get_real_ts64(&now); | |
150 | words[0] = (u32)now.tv_sec; | |
be1c6341 OK |
151 | words[1] = now.tv_nsec; |
152 | ||
153 | local_irq_save(flags); | |
ca1136c9 | 154 | trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words), NULL); |
be1c6341 | 155 | local_irq_restore(flags); |
2056a782 JA |
156 | } |
157 | ||
35fe6d76 SL |
158 | void __trace_note_message(struct blk_trace *bt, struct blkcg *blkcg, |
159 | const char *fmt, ...) | |
9d5f09a4 AB |
160 | { |
161 | int n; | |
162 | va_list args; | |
14a73f54 | 163 | unsigned long flags; |
64565911 | 164 | char *buf; |
9d5f09a4 | 165 | |
18cea459 LZ |
166 | if (unlikely(bt->trace_state != Blktrace_running && |
167 | !blk_tracer_enabled)) | |
c71a8961 ACM |
168 | return; |
169 | ||
490da40d TM |
170 | /* |
171 | * If the BLK_TC_NOTIFY action mask isn't set, don't send any note | |
172 | * message to the trace. | |
173 | */ | |
174 | if (!(bt->act_mask & BLK_TC_NOTIFY)) | |
175 | return; | |
176 | ||
14a73f54 | 177 | local_irq_save(flags); |
d8a0349c | 178 | buf = this_cpu_ptr(bt->msg_data); |
9d5f09a4 | 179 | va_start(args, fmt); |
64565911 | 180 | n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); |
9d5f09a4 AB |
181 | va_end(args); |
182 | ||
35fe6d76 SL |
183 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP)) |
184 | blkcg = NULL; | |
185 | #ifdef CONFIG_BLK_CGROUP | |
186 | trace_note(bt, 0, BLK_TN_MESSAGE, buf, n, | |
187 | blkcg ? cgroup_get_kernfs_id(blkcg->css.cgroup) : NULL); | |
188 | #else | |
ca1136c9 | 189 | trace_note(bt, 0, BLK_TN_MESSAGE, buf, n, NULL); |
35fe6d76 | 190 | #endif |
14a73f54 | 191 | local_irq_restore(flags); |
9d5f09a4 AB |
192 | } |
193 | EXPORT_SYMBOL_GPL(__trace_note_message); | |
194 | ||
2056a782 JA |
195 | static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, |
196 | pid_t pid) | |
197 | { | |
198 | if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) | |
199 | return 1; | |
d0deef5b | 200 | if (sector && (sector < bt->start_lba || sector > bt->end_lba)) |
2056a782 JA |
201 | return 1; |
202 | if (bt->pid && pid != bt->pid) | |
203 | return 1; | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Data direction bit lookup | |
210 | */ | |
e4955c99 LZ |
211 | static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), |
212 | BLK_TC_ACT(BLK_TC_WRITE) }; | |
2056a782 | 213 | |
7b6d91da | 214 | #define BLK_TC_RAHEAD BLK_TC_AHEAD |
28a8f0d3 | 215 | #define BLK_TC_PREFLUSH BLK_TC_FLUSH |
7b6d91da | 216 | |
35ba8f70 | 217 | /* The ilog2() calls fall out because they're constant */ |
7b6d91da CH |
218 | #define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \ |
219 | (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name)) | |
2056a782 JA |
220 | |
221 | /* | |
222 | * The worker for the various blk_add_trace*() types. Fills out a | |
223 | * blk_io_trace structure and places it in a per-cpu subbuffer. | |
224 | */ | |
5f3ea37c | 225 | static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, |
1b9a9ab7 | 226 | int op, int op_flags, u32 what, int error, int pdu_len, |
ca1136c9 | 227 | void *pdu_data, union kernfs_node_id *cgid) |
2056a782 JA |
228 | { |
229 | struct task_struct *tsk = current; | |
c71a8961 | 230 | struct ring_buffer_event *event = NULL; |
e77405ad | 231 | struct ring_buffer *buffer = NULL; |
2056a782 | 232 | struct blk_io_trace *t; |
0a987751 | 233 | unsigned long flags = 0; |
2056a782 JA |
234 | unsigned long *sequence; |
235 | pid_t pid; | |
c71a8961 | 236 | int cpu, pc = 0; |
18cea459 | 237 | bool blk_tracer = blk_tracer_enabled; |
ca1136c9 | 238 | ssize_t cgid_len = cgid ? sizeof(*cgid) : 0; |
2056a782 | 239 | |
18cea459 | 240 | if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) |
2056a782 JA |
241 | return; |
242 | ||
1b9a9ab7 MC |
243 | what |= ddir_act[op_is_write(op) ? WRITE : READ]; |
244 | what |= MASK_TC_BIT(op_flags, SYNC); | |
245 | what |= MASK_TC_BIT(op_flags, RAHEAD); | |
246 | what |= MASK_TC_BIT(op_flags, META); | |
28a8f0d3 | 247 | what |= MASK_TC_BIT(op_flags, PREFLUSH); |
1b9a9ab7 | 248 | what |= MASK_TC_BIT(op_flags, FUA); |
7afafc8a | 249 | if (op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE) |
1b9a9ab7 | 250 | what |= BLK_TC_ACT(BLK_TC_DISCARD); |
3a5e02ce MC |
251 | if (op == REQ_OP_FLUSH) |
252 | what |= BLK_TC_ACT(BLK_TC_FLUSH); | |
ca1136c9 SL |
253 | if (cgid) |
254 | what |= __BLK_TA_CGROUP; | |
2056a782 JA |
255 | |
256 | pid = tsk->pid; | |
d0deef5b | 257 | if (act_log_check(bt, what, sector, pid)) |
2056a782 | 258 | return; |
c71a8961 ACM |
259 | cpu = raw_smp_processor_id(); |
260 | ||
18cea459 | 261 | if (blk_tracer) { |
c71a8961 ACM |
262 | tracing_record_cmdline(current); |
263 | ||
12883efb | 264 | buffer = blk_tr->trace_buffer.buffer; |
51a763dd | 265 | pc = preempt_count(); |
e77405ad | 266 | event = trace_buffer_lock_reserve(buffer, TRACE_BLK, |
ca1136c9 | 267 | sizeof(*t) + pdu_len + cgid_len, |
51a763dd | 268 | 0, pc); |
c71a8961 ACM |
269 | if (!event) |
270 | return; | |
51a763dd | 271 | t = ring_buffer_event_data(event); |
c71a8961 ACM |
272 | goto record_it; |
273 | } | |
2056a782 | 274 | |
a404d557 JK |
275 | if (unlikely(tsk->btrace_seq != blktrace_seq)) |
276 | trace_note_tsk(tsk); | |
277 | ||
2056a782 JA |
278 | /* |
279 | * A word about the locking here - we disable interrupts to reserve | |
280 | * some space in the relay per-cpu buffer, to prevent an irq | |
14a73f54 | 281 | * from coming in and stepping on our toes. |
2056a782 JA |
282 | */ |
283 | local_irq_save(flags); | |
ca1136c9 | 284 | t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len + cgid_len); |
2056a782 | 285 | if (t) { |
2056a782 JA |
286 | sequence = per_cpu_ptr(bt->sequence, cpu); |
287 | ||
288 | t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; | |
289 | t->sequence = ++(*sequence); | |
2997c8c4 | 290 | t->time = ktime_to_ns(ktime_get()); |
c71a8961 | 291 | record_it: |
08a06b83 | 292 | /* |
939b3669 ACM |
293 | * These two are not needed in ftrace as they are in the |
294 | * generic trace_entry, filled by tracing_generic_entry_update, | |
295 | * but for the trace_event->bin() synthesizer benefit we do it | |
296 | * here too. | |
297 | */ | |
298 | t->cpu = cpu; | |
299 | t->pid = pid; | |
08a06b83 | 300 | |
2056a782 JA |
301 | t->sector = sector; |
302 | t->bytes = bytes; | |
303 | t->action = what; | |
2056a782 | 304 | t->device = bt->dev; |
2056a782 | 305 | t->error = error; |
ca1136c9 | 306 | t->pdu_len = pdu_len + cgid_len; |
2056a782 | 307 | |
ca1136c9 SL |
308 | if (cgid_len) |
309 | memcpy((void *)t + sizeof(*t), cgid, cgid_len); | |
2056a782 | 310 | if (pdu_len) |
ca1136c9 | 311 | memcpy((void *)t + sizeof(*t) + cgid_len, pdu_data, pdu_len); |
c71a8961 | 312 | |
18cea459 | 313 | if (blk_tracer) { |
b7f0c959 | 314 | trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc); |
c71a8961 ACM |
315 | return; |
316 | } | |
2056a782 JA |
317 | } |
318 | ||
319 | local_irq_restore(flags); | |
320 | } | |
321 | ||
ad5dd549 | 322 | static void blk_trace_free(struct blk_trace *bt) |
2056a782 | 323 | { |
02c62304 | 324 | debugfs_remove(bt->msg_file); |
2056a782 | 325 | debugfs_remove(bt->dropped_file); |
f48fc4d3 | 326 | relay_close(bt->rchan); |
39cbb602 | 327 | debugfs_remove(bt->dir); |
2056a782 | 328 | free_percpu(bt->sequence); |
64565911 | 329 | free_percpu(bt->msg_data); |
2056a782 | 330 | kfree(bt); |
ad5dd549 LZ |
331 | } |
332 | ||
a6da0024 JA |
333 | static void get_probe_ref(void) |
334 | { | |
335 | mutex_lock(&blk_probe_mutex); | |
336 | if (++blk_probes_ref == 1) | |
337 | blk_register_tracepoints(); | |
338 | mutex_unlock(&blk_probe_mutex); | |
339 | } | |
340 | ||
341 | static void put_probe_ref(void) | |
342 | { | |
343 | mutex_lock(&blk_probe_mutex); | |
344 | if (!--blk_probes_ref) | |
345 | blk_unregister_tracepoints(); | |
346 | mutex_unlock(&blk_probe_mutex); | |
347 | } | |
348 | ||
ad5dd549 LZ |
349 | static void blk_trace_cleanup(struct blk_trace *bt) |
350 | { | |
351 | blk_trace_free(bt); | |
a6da0024 | 352 | put_probe_ref(); |
2056a782 JA |
353 | } |
354 | ||
1f2cac10 | 355 | static int __blk_trace_remove(struct request_queue *q) |
2056a782 JA |
356 | { |
357 | struct blk_trace *bt; | |
358 | ||
359 | bt = xchg(&q->blk_trace, NULL); | |
360 | if (!bt) | |
361 | return -EINVAL; | |
362 | ||
55547204 | 363 | if (bt->trace_state != Blktrace_running) |
2056a782 JA |
364 | blk_trace_cleanup(bt); |
365 | ||
366 | return 0; | |
367 | } | |
1f2cac10 JA |
368 | |
369 | int blk_trace_remove(struct request_queue *q) | |
370 | { | |
371 | int ret; | |
372 | ||
373 | mutex_lock(&q->blk_trace_mutex); | |
374 | ret = __blk_trace_remove(q); | |
375 | mutex_unlock(&q->blk_trace_mutex); | |
376 | ||
377 | return ret; | |
378 | } | |
6da127ad | 379 | EXPORT_SYMBOL_GPL(blk_trace_remove); |
2056a782 | 380 | |
2056a782 JA |
381 | static ssize_t blk_dropped_read(struct file *filp, char __user *buffer, |
382 | size_t count, loff_t *ppos) | |
383 | { | |
384 | struct blk_trace *bt = filp->private_data; | |
385 | char buf[16]; | |
386 | ||
387 | snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); | |
388 | ||
389 | return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); | |
390 | } | |
391 | ||
2b8693c0 | 392 | static const struct file_operations blk_dropped_fops = { |
2056a782 | 393 | .owner = THIS_MODULE, |
234e3405 | 394 | .open = simple_open, |
2056a782 | 395 | .read = blk_dropped_read, |
6038f373 | 396 | .llseek = default_llseek, |
2056a782 JA |
397 | }; |
398 | ||
02c62304 AB |
399 | static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, |
400 | size_t count, loff_t *ppos) | |
401 | { | |
402 | char *msg; | |
403 | struct blk_trace *bt; | |
404 | ||
7635b03a | 405 | if (count >= BLK_TN_MAX_MSG) |
02c62304 AB |
406 | return -EINVAL; |
407 | ||
16e5c1fc AV |
408 | msg = memdup_user_nul(buffer, count); |
409 | if (IS_ERR(msg)) | |
410 | return PTR_ERR(msg); | |
02c62304 | 411 | |
02c62304 | 412 | bt = filp->private_data; |
35fe6d76 | 413 | __trace_note_message(bt, NULL, "%s", msg); |
02c62304 AB |
414 | kfree(msg); |
415 | ||
416 | return count; | |
417 | } | |
418 | ||
419 | static const struct file_operations blk_msg_fops = { | |
420 | .owner = THIS_MODULE, | |
234e3405 | 421 | .open = simple_open, |
02c62304 | 422 | .write = blk_msg_write, |
6038f373 | 423 | .llseek = noop_llseek, |
02c62304 AB |
424 | }; |
425 | ||
2056a782 JA |
426 | /* |
427 | * Keep track of how many times we encountered a full subbuffer, to aid | |
428 | * the user space app in telling how many lost events there were. | |
429 | */ | |
430 | static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, | |
431 | void *prev_subbuf, size_t prev_padding) | |
432 | { | |
433 | struct blk_trace *bt; | |
434 | ||
435 | if (!relay_buf_full(buf)) | |
436 | return 1; | |
437 | ||
438 | bt = buf->chan->private_data; | |
439 | atomic_inc(&bt->dropped); | |
440 | return 0; | |
441 | } | |
442 | ||
443 | static int blk_remove_buf_file_callback(struct dentry *dentry) | |
444 | { | |
445 | debugfs_remove(dentry); | |
f48fc4d3 | 446 | |
2056a782 JA |
447 | return 0; |
448 | } | |
449 | ||
450 | static struct dentry *blk_create_buf_file_callback(const char *filename, | |
451 | struct dentry *parent, | |
f4ae40a6 | 452 | umode_t mode, |
2056a782 JA |
453 | struct rchan_buf *buf, |
454 | int *is_global) | |
455 | { | |
456 | return debugfs_create_file(filename, mode, parent, buf, | |
457 | &relay_file_operations); | |
458 | } | |
459 | ||
460 | static struct rchan_callbacks blk_relay_callbacks = { | |
461 | .subbuf_start = blk_subbuf_start_callback, | |
462 | .create_buf_file = blk_create_buf_file_callback, | |
463 | .remove_buf_file = blk_remove_buf_file_callback, | |
464 | }; | |
465 | ||
9908c309 LZ |
466 | static void blk_trace_setup_lba(struct blk_trace *bt, |
467 | struct block_device *bdev) | |
468 | { | |
469 | struct hd_struct *part = NULL; | |
470 | ||
471 | if (bdev) | |
472 | part = bdev->bd_part; | |
473 | ||
474 | if (part) { | |
475 | bt->start_lba = part->start_sect; | |
476 | bt->end_lba = part->start_sect + part->nr_sects; | |
477 | } else { | |
478 | bt->start_lba = 0; | |
479 | bt->end_lba = -1ULL; | |
480 | } | |
481 | } | |
482 | ||
2056a782 JA |
483 | /* |
484 | * Setup everything required to start tracing | |
485 | */ | |
a428d314 OS |
486 | static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
487 | struct block_device *bdev, | |
488 | struct blk_user_trace_setup *buts) | |
2056a782 | 489 | { |
cdea01b2 | 490 | struct blk_trace *bt = NULL; |
2056a782 | 491 | struct dentry *dir = NULL; |
ff14417c | 492 | int ret; |
2056a782 | 493 | |
171044d4 | 494 | if (!buts->buf_size || !buts->buf_nr) |
2056a782 JA |
495 | return -EINVAL; |
496 | ||
0497b345 JA |
497 | strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); |
498 | buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; | |
2056a782 JA |
499 | |
500 | /* | |
501 | * some device names have larger paths - convert the slashes | |
502 | * to underscores for this to work as expected | |
503 | */ | |
ff14417c | 504 | strreplace(buts->name, '/', '_'); |
2056a782 | 505 | |
2056a782 JA |
506 | bt = kzalloc(sizeof(*bt), GFP_KERNEL); |
507 | if (!bt) | |
ad5dd549 | 508 | return -ENOMEM; |
2056a782 | 509 | |
ad5dd549 | 510 | ret = -ENOMEM; |
2056a782 JA |
511 | bt->sequence = alloc_percpu(unsigned long); |
512 | if (!bt->sequence) | |
513 | goto err; | |
514 | ||
313e458f | 515 | bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); |
64565911 JA |
516 | if (!bt->msg_data) |
517 | goto err; | |
518 | ||
2056a782 | 519 | ret = -ENOENT; |
f48fc4d3 | 520 | |
18fbda91 OS |
521 | if (!blk_debugfs_root) |
522 | goto err; | |
f48fc4d3 | 523 | |
6ac93117 OS |
524 | dir = debugfs_lookup(buts->name, blk_debugfs_root); |
525 | if (!dir) | |
526 | bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root); | |
2056a782 JA |
527 | if (!dir) |
528 | goto err; | |
529 | ||
6da127ad | 530 | bt->dev = dev; |
2056a782 | 531 | atomic_set(&bt->dropped, 0); |
a404d557 | 532 | INIT_LIST_HEAD(&bt->running_list); |
2056a782 JA |
533 | |
534 | ret = -EIO; | |
939b3669 ACM |
535 | bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, |
536 | &blk_dropped_fops); | |
2056a782 JA |
537 | if (!bt->dropped_file) |
538 | goto err; | |
539 | ||
02c62304 AB |
540 | bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); |
541 | if (!bt->msg_file) | |
542 | goto err; | |
543 | ||
171044d4 AB |
544 | bt->rchan = relay_open("trace", dir, buts->buf_size, |
545 | buts->buf_nr, &blk_relay_callbacks, bt); | |
2056a782 JA |
546 | if (!bt->rchan) |
547 | goto err; | |
2056a782 | 548 | |
171044d4 | 549 | bt->act_mask = buts->act_mask; |
2056a782 JA |
550 | if (!bt->act_mask) |
551 | bt->act_mask = (u16) -1; | |
552 | ||
9908c309 | 553 | blk_trace_setup_lba(bt, bdev); |
2056a782 | 554 | |
d0deef5b SD |
555 | /* overwrite with user settings */ |
556 | if (buts->start_lba) | |
557 | bt->start_lba = buts->start_lba; | |
558 | if (buts->end_lba) | |
559 | bt->end_lba = buts->end_lba; | |
560 | ||
171044d4 | 561 | bt->pid = buts->pid; |
2056a782 JA |
562 | bt->trace_state = Blktrace_setup; |
563 | ||
564 | ret = -EBUSY; | |
cdea01b2 | 565 | if (cmpxchg(&q->blk_trace, NULL, bt)) |
2056a782 | 566 | goto err; |
2056a782 | 567 | |
a6da0024 | 568 | get_probe_ref(); |
cbe28296 | 569 | |
6ac93117 | 570 | ret = 0; |
2056a782 | 571 | err: |
6ac93117 OS |
572 | if (dir && !bt->dir) |
573 | dput(dir); | |
574 | if (ret) | |
575 | blk_trace_free(bt); | |
2056a782 JA |
576 | return ret; |
577 | } | |
171044d4 | 578 | |
1f2cac10 JA |
579 | static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
580 | struct block_device *bdev, char __user *arg) | |
171044d4 AB |
581 | { |
582 | struct blk_user_trace_setup buts; | |
583 | int ret; | |
584 | ||
585 | ret = copy_from_user(&buts, arg, sizeof(buts)); | |
586 | if (ret) | |
587 | return -EFAULT; | |
588 | ||
d0deef5b | 589 | ret = do_blk_trace_setup(q, name, dev, bdev, &buts); |
171044d4 AB |
590 | if (ret) |
591 | return ret; | |
592 | ||
9a8c28c8 | 593 | if (copy_to_user(arg, &buts, sizeof(buts))) { |
2967acbb | 594 | __blk_trace_remove(q); |
171044d4 | 595 | return -EFAULT; |
9a8c28c8 | 596 | } |
171044d4 AB |
597 | return 0; |
598 | } | |
1f2cac10 JA |
599 | |
600 | int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, | |
601 | struct block_device *bdev, | |
602 | char __user *arg) | |
603 | { | |
604 | int ret; | |
605 | ||
606 | mutex_lock(&q->blk_trace_mutex); | |
607 | ret = __blk_trace_setup(q, name, dev, bdev, arg); | |
608 | mutex_unlock(&q->blk_trace_mutex); | |
609 | ||
610 | return ret; | |
611 | } | |
6da127ad | 612 | EXPORT_SYMBOL_GPL(blk_trace_setup); |
2056a782 | 613 | |
62c2a7d9 AB |
614 | #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) |
615 | static int compat_blk_trace_setup(struct request_queue *q, char *name, | |
616 | dev_t dev, struct block_device *bdev, | |
617 | char __user *arg) | |
618 | { | |
619 | struct blk_user_trace_setup buts; | |
620 | struct compat_blk_user_trace_setup cbuts; | |
621 | int ret; | |
622 | ||
623 | if (copy_from_user(&cbuts, arg, sizeof(cbuts))) | |
624 | return -EFAULT; | |
625 | ||
626 | buts = (struct blk_user_trace_setup) { | |
627 | .act_mask = cbuts.act_mask, | |
628 | .buf_size = cbuts.buf_size, | |
629 | .buf_nr = cbuts.buf_nr, | |
630 | .start_lba = cbuts.start_lba, | |
631 | .end_lba = cbuts.end_lba, | |
632 | .pid = cbuts.pid, | |
633 | }; | |
62c2a7d9 AB |
634 | |
635 | ret = do_blk_trace_setup(q, name, dev, bdev, &buts); | |
636 | if (ret) | |
637 | return ret; | |
638 | ||
f8c5e944 | 639 | if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) { |
2967acbb | 640 | __blk_trace_remove(q); |
62c2a7d9 AB |
641 | return -EFAULT; |
642 | } | |
643 | ||
644 | return 0; | |
645 | } | |
646 | #endif | |
647 | ||
1f2cac10 | 648 | static int __blk_trace_startstop(struct request_queue *q, int start) |
2056a782 | 649 | { |
2056a782 | 650 | int ret; |
939b3669 | 651 | struct blk_trace *bt = q->blk_trace; |
2056a782 | 652 | |
939b3669 | 653 | if (bt == NULL) |
2056a782 JA |
654 | return -EINVAL; |
655 | ||
656 | /* | |
657 | * For starting a trace, we can transition from a setup or stopped | |
658 | * trace. For stopping a trace, the state must be running | |
659 | */ | |
660 | ret = -EINVAL; | |
661 | if (start) { | |
662 | if (bt->trace_state == Blktrace_setup || | |
663 | bt->trace_state == Blktrace_stopped) { | |
664 | blktrace_seq++; | |
665 | smp_mb(); | |
666 | bt->trace_state = Blktrace_running; | |
a404d557 JK |
667 | spin_lock_irq(&running_trace_lock); |
668 | list_add(&bt->running_list, &running_trace_list); | |
669 | spin_unlock_irq(&running_trace_lock); | |
be1c6341 OK |
670 | |
671 | trace_note_time(bt); | |
2056a782 JA |
672 | ret = 0; |
673 | } | |
674 | } else { | |
675 | if (bt->trace_state == Blktrace_running) { | |
676 | bt->trace_state = Blktrace_stopped; | |
a404d557 JK |
677 | spin_lock_irq(&running_trace_lock); |
678 | list_del_init(&bt->running_list); | |
679 | spin_unlock_irq(&running_trace_lock); | |
2056a782 JA |
680 | relay_flush(bt->rchan); |
681 | ret = 0; | |
682 | } | |
683 | } | |
684 | ||
685 | return ret; | |
686 | } | |
1f2cac10 JA |
687 | |
688 | int blk_trace_startstop(struct request_queue *q, int start) | |
689 | { | |
690 | int ret; | |
691 | ||
692 | mutex_lock(&q->blk_trace_mutex); | |
693 | ret = __blk_trace_startstop(q, start); | |
694 | mutex_unlock(&q->blk_trace_mutex); | |
695 | ||
696 | return ret; | |
697 | } | |
6da127ad | 698 | EXPORT_SYMBOL_GPL(blk_trace_startstop); |
2056a782 | 699 | |
5acb3cc2 WL |
700 | /* |
701 | * When reading or writing the blktrace sysfs files, the references to the | |
702 | * opened sysfs or device files should prevent the underlying block device | |
703 | * from being removed. So no further delete protection is really needed. | |
704 | */ | |
705 | ||
2056a782 JA |
706 | /** |
707 | * blk_trace_ioctl: - handle the ioctls associated with tracing | |
708 | * @bdev: the block device | |
ef18012b | 709 | * @cmd: the ioctl cmd |
2056a782 JA |
710 | * @arg: the argument data, if any |
711 | * | |
712 | **/ | |
713 | int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) | |
714 | { | |
165125e1 | 715 | struct request_queue *q; |
2056a782 | 716 | int ret, start = 0; |
6da127ad | 717 | char b[BDEVNAME_SIZE]; |
2056a782 JA |
718 | |
719 | q = bdev_get_queue(bdev); | |
720 | if (!q) | |
721 | return -ENXIO; | |
722 | ||
5acb3cc2 | 723 | mutex_lock(&q->blk_trace_mutex); |
2056a782 JA |
724 | |
725 | switch (cmd) { | |
726 | case BLKTRACESETUP: | |
f36f21ec | 727 | bdevname(bdev, b); |
1f2cac10 | 728 | ret = __blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); |
2056a782 | 729 | break; |
62c2a7d9 AB |
730 | #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) |
731 | case BLKTRACESETUP32: | |
732 | bdevname(bdev, b); | |
733 | ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); | |
734 | break; | |
735 | #endif | |
2056a782 JA |
736 | case BLKTRACESTART: |
737 | start = 1; | |
738 | case BLKTRACESTOP: | |
1f2cac10 | 739 | ret = __blk_trace_startstop(q, start); |
2056a782 JA |
740 | break; |
741 | case BLKTRACETEARDOWN: | |
1f2cac10 | 742 | ret = __blk_trace_remove(q); |
2056a782 JA |
743 | break; |
744 | default: | |
745 | ret = -ENOTTY; | |
746 | break; | |
747 | } | |
748 | ||
5acb3cc2 | 749 | mutex_unlock(&q->blk_trace_mutex); |
2056a782 JA |
750 | return ret; |
751 | } | |
752 | ||
753 | /** | |
754 | * blk_trace_shutdown: - stop and cleanup trace structures | |
755 | * @q: the request queue associated with the device | |
756 | * | |
757 | **/ | |
165125e1 | 758 | void blk_trace_shutdown(struct request_queue *q) |
2056a782 | 759 | { |
1f2cac10 JA |
760 | mutex_lock(&q->blk_trace_mutex); |
761 | ||
6c5c9341 | 762 | if (q->blk_trace) { |
1f2cac10 JA |
763 | __blk_trace_startstop(q, 0); |
764 | __blk_trace_remove(q); | |
6c5c9341 | 765 | } |
1f2cac10 JA |
766 | |
767 | mutex_unlock(&q->blk_trace_mutex); | |
2056a782 | 768 | } |
5f3ea37c | 769 | |
ca1136c9 SL |
770 | #ifdef CONFIG_BLK_CGROUP |
771 | static union kernfs_node_id * | |
772 | blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) | |
773 | { | |
774 | struct blk_trace *bt = q->blk_trace; | |
775 | ||
776 | if (!bt || !(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP)) | |
777 | return NULL; | |
778 | ||
779 | if (!bio->bi_css) | |
780 | return NULL; | |
781 | return cgroup_get_kernfs_id(bio->bi_css->cgroup); | |
782 | } | |
783 | #else | |
784 | static union kernfs_node_id * | |
785 | blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) | |
786 | { | |
787 | return NULL; | |
788 | } | |
789 | #endif | |
790 | ||
791 | static union kernfs_node_id * | |
792 | blk_trace_request_get_cgid(struct request_queue *q, struct request *rq) | |
793 | { | |
794 | if (!rq->bio) | |
795 | return NULL; | |
796 | /* Use the first bio */ | |
797 | return blk_trace_bio_get_cgid(q, rq->bio); | |
798 | } | |
799 | ||
5f3ea37c ACM |
800 | /* |
801 | * blktrace probes | |
802 | */ | |
803 | ||
804 | /** | |
805 | * blk_add_trace_rq - Add a trace for a request oriented action | |
5f3ea37c | 806 | * @rq: the source request |
caf7df12 | 807 | * @error: return status to log |
af5040da | 808 | * @nr_bytes: number of completed bytes |
5f3ea37c | 809 | * @what: the action |
ca1136c9 | 810 | * @cgid: the cgroup info |
5f3ea37c ACM |
811 | * |
812 | * Description: | |
813 | * Records an action against a request. Will log the bio offset + size. | |
814 | * | |
815 | **/ | |
caf7df12 | 816 | static void blk_add_trace_rq(struct request *rq, int error, |
ca1136c9 SL |
817 | unsigned int nr_bytes, u32 what, |
818 | union kernfs_node_id *cgid) | |
5f3ea37c | 819 | { |
caf7df12 | 820 | struct blk_trace *bt = rq->q->blk_trace; |
5f3ea37c ACM |
821 | |
822 | if (likely(!bt)) | |
823 | return; | |
824 | ||
57292b58 | 825 | if (blk_rq_is_passthrough(rq)) |
5f3ea37c | 826 | what |= BLK_TC_ACT(BLK_TC_PC); |
48b77ad6 | 827 | else |
5f3ea37c | 828 | what |= BLK_TC_ACT(BLK_TC_FS); |
48b77ad6 CH |
829 | |
830 | __blk_add_trace(bt, blk_rq_trace_sector(rq), nr_bytes, req_op(rq), | |
ca1136c9 | 831 | rq->cmd_flags, what, error, 0, NULL, cgid); |
5f3ea37c ACM |
832 | } |
833 | ||
38516ab5 SR |
834 | static void blk_add_trace_rq_insert(void *ignore, |
835 | struct request_queue *q, struct request *rq) | |
5f3ea37c | 836 | { |
ca1136c9 SL |
837 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_INSERT, |
838 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
839 | } |
840 | ||
38516ab5 SR |
841 | static void blk_add_trace_rq_issue(void *ignore, |
842 | struct request_queue *q, struct request *rq) | |
5f3ea37c | 843 | { |
ca1136c9 SL |
844 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_ISSUE, |
845 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
846 | } |
847 | ||
38516ab5 SR |
848 | static void blk_add_trace_rq_requeue(void *ignore, |
849 | struct request_queue *q, | |
939b3669 | 850 | struct request *rq) |
5f3ea37c | 851 | { |
ca1136c9 SL |
852 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_REQUEUE, |
853 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
854 | } |
855 | ||
caf7df12 CH |
856 | static void blk_add_trace_rq_complete(void *ignore, struct request *rq, |
857 | int error, unsigned int nr_bytes) | |
5f3ea37c | 858 | { |
ca1136c9 SL |
859 | blk_add_trace_rq(rq, error, nr_bytes, BLK_TA_COMPLETE, |
860 | blk_trace_request_get_cgid(rq->q, rq)); | |
5f3ea37c ACM |
861 | } |
862 | ||
863 | /** | |
864 | * blk_add_trace_bio - Add a trace for a bio oriented action | |
865 | * @q: queue the io is for | |
866 | * @bio: the source bio | |
867 | * @what: the action | |
797a455d | 868 | * @error: error, if any |
5f3ea37c ACM |
869 | * |
870 | * Description: | |
871 | * Records an action against a bio. Will log the bio offset + size. | |
872 | * | |
873 | **/ | |
874 | static void blk_add_trace_bio(struct request_queue *q, struct bio *bio, | |
1690102d | 875 | u32 what, int error) |
5f3ea37c ACM |
876 | { |
877 | struct blk_trace *bt = q->blk_trace; | |
878 | ||
879 | if (likely(!bt)) | |
880 | return; | |
881 | ||
4f024f37 | 882 | __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, |
1690102d MPS |
883 | bio_op(bio), bio->bi_opf, what, error, 0, NULL, |
884 | blk_trace_bio_get_cgid(q, bio)); | |
5f3ea37c ACM |
885 | } |
886 | ||
38516ab5 SR |
887 | static void blk_add_trace_bio_bounce(void *ignore, |
888 | struct request_queue *q, struct bio *bio) | |
5f3ea37c | 889 | { |
1690102d | 890 | blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0); |
5f3ea37c ACM |
891 | } |
892 | ||
0a82a8d1 LT |
893 | static void blk_add_trace_bio_complete(void *ignore, |
894 | struct request_queue *q, struct bio *bio, | |
895 | int error) | |
5f3ea37c | 896 | { |
1690102d | 897 | blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error); |
5f3ea37c ACM |
898 | } |
899 | ||
38516ab5 SR |
900 | static void blk_add_trace_bio_backmerge(void *ignore, |
901 | struct request_queue *q, | |
8c1cf6bb | 902 | struct request *rq, |
939b3669 | 903 | struct bio *bio) |
5f3ea37c | 904 | { |
1690102d | 905 | blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0); |
5f3ea37c ACM |
906 | } |
907 | ||
38516ab5 SR |
908 | static void blk_add_trace_bio_frontmerge(void *ignore, |
909 | struct request_queue *q, | |
8c1cf6bb | 910 | struct request *rq, |
939b3669 | 911 | struct bio *bio) |
5f3ea37c | 912 | { |
1690102d | 913 | blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0); |
5f3ea37c ACM |
914 | } |
915 | ||
38516ab5 SR |
916 | static void blk_add_trace_bio_queue(void *ignore, |
917 | struct request_queue *q, struct bio *bio) | |
5f3ea37c | 918 | { |
1690102d | 919 | blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0); |
5f3ea37c ACM |
920 | } |
921 | ||
38516ab5 SR |
922 | static void blk_add_trace_getrq(void *ignore, |
923 | struct request_queue *q, | |
939b3669 | 924 | struct bio *bio, int rw) |
5f3ea37c ACM |
925 | { |
926 | if (bio) | |
1690102d | 927 | blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0); |
5f3ea37c ACM |
928 | else { |
929 | struct blk_trace *bt = q->blk_trace; | |
930 | ||
931 | if (bt) | |
1b9a9ab7 | 932 | __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_GETRQ, 0, 0, |
ca1136c9 | 933 | NULL, NULL); |
5f3ea37c ACM |
934 | } |
935 | } | |
936 | ||
937 | ||
38516ab5 SR |
938 | static void blk_add_trace_sleeprq(void *ignore, |
939 | struct request_queue *q, | |
939b3669 | 940 | struct bio *bio, int rw) |
5f3ea37c ACM |
941 | { |
942 | if (bio) | |
1690102d | 943 | blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0); |
5f3ea37c ACM |
944 | else { |
945 | struct blk_trace *bt = q->blk_trace; | |
946 | ||
947 | if (bt) | |
1b9a9ab7 | 948 | __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_SLEEPRQ, |
ca1136c9 | 949 | 0, 0, NULL, NULL); |
5f3ea37c ACM |
950 | } |
951 | } | |
952 | ||
38516ab5 | 953 | static void blk_add_trace_plug(void *ignore, struct request_queue *q) |
5f3ea37c ACM |
954 | { |
955 | struct blk_trace *bt = q->blk_trace; | |
956 | ||
957 | if (bt) | |
ca1136c9 | 958 | __blk_add_trace(bt, 0, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL, NULL); |
5f3ea37c ACM |
959 | } |
960 | ||
49cac01e JA |
961 | static void blk_add_trace_unplug(void *ignore, struct request_queue *q, |
962 | unsigned int depth, bool explicit) | |
5f3ea37c ACM |
963 | { |
964 | struct blk_trace *bt = q->blk_trace; | |
965 | ||
966 | if (bt) { | |
94b5eb28 | 967 | __be64 rpdu = cpu_to_be64(depth); |
49cac01e | 968 | u32 what; |
5f3ea37c | 969 | |
49cac01e JA |
970 | if (explicit) |
971 | what = BLK_TA_UNPLUG_IO; | |
972 | else | |
973 | what = BLK_TA_UNPLUG_TIMER; | |
974 | ||
ca1136c9 | 975 | __blk_add_trace(bt, 0, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu, NULL); |
5f3ea37c ACM |
976 | } |
977 | } | |
978 | ||
38516ab5 SR |
979 | static void blk_add_trace_split(void *ignore, |
980 | struct request_queue *q, struct bio *bio, | |
5f3ea37c ACM |
981 | unsigned int pdu) |
982 | { | |
983 | struct blk_trace *bt = q->blk_trace; | |
984 | ||
985 | if (bt) { | |
986 | __be64 rpdu = cpu_to_be64(pdu); | |
987 | ||
4f024f37 | 988 | __blk_add_trace(bt, bio->bi_iter.bi_sector, |
1eff9d32 | 989 | bio->bi_iter.bi_size, bio_op(bio), bio->bi_opf, |
4e4cbee9 | 990 | BLK_TA_SPLIT, bio->bi_status, sizeof(rpdu), |
ca1136c9 | 991 | &rpdu, blk_trace_bio_get_cgid(q, bio)); |
5f3ea37c ACM |
992 | } |
993 | } | |
994 | ||
995 | /** | |
d07335e5 | 996 | * blk_add_trace_bio_remap - Add a trace for a bio-remap operation |
546cf44a | 997 | * @ignore: trace callback data parameter (not used) |
5f3ea37c ACM |
998 | * @q: queue the io is for |
999 | * @bio: the source bio | |
1000 | * @dev: target device | |
a42aaa3b | 1001 | * @from: source sector |
5f3ea37c ACM |
1002 | * |
1003 | * Description: | |
1004 | * Device mapper or raid target sometimes need to split a bio because | |
1005 | * it spans a stripe (or similar). Add a trace for that action. | |
1006 | * | |
1007 | **/ | |
d07335e5 MS |
1008 | static void blk_add_trace_bio_remap(void *ignore, |
1009 | struct request_queue *q, struct bio *bio, | |
1010 | dev_t dev, sector_t from) | |
5f3ea37c ACM |
1011 | { |
1012 | struct blk_trace *bt = q->blk_trace; | |
1013 | struct blk_io_trace_remap r; | |
1014 | ||
1015 | if (likely(!bt)) | |
1016 | return; | |
1017 | ||
a42aaa3b | 1018 | r.device_from = cpu_to_be32(dev); |
74d46992 | 1019 | r.device_to = cpu_to_be32(bio_dev(bio)); |
a42aaa3b | 1020 | r.sector_from = cpu_to_be64(from); |
5f3ea37c | 1021 | |
4f024f37 | 1022 | __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, |
4e4cbee9 | 1023 | bio_op(bio), bio->bi_opf, BLK_TA_REMAP, bio->bi_status, |
ca1136c9 | 1024 | sizeof(r), &r, blk_trace_bio_get_cgid(q, bio)); |
5f3ea37c ACM |
1025 | } |
1026 | ||
b0da3f0d JN |
1027 | /** |
1028 | * blk_add_trace_rq_remap - Add a trace for a request-remap operation | |
546cf44a | 1029 | * @ignore: trace callback data parameter (not used) |
b0da3f0d JN |
1030 | * @q: queue the io is for |
1031 | * @rq: the source request | |
1032 | * @dev: target device | |
1033 | * @from: source sector | |
1034 | * | |
1035 | * Description: | |
1036 | * Device mapper remaps request to other devices. | |
1037 | * Add a trace for that action. | |
1038 | * | |
1039 | **/ | |
38516ab5 SR |
1040 | static void blk_add_trace_rq_remap(void *ignore, |
1041 | struct request_queue *q, | |
b0da3f0d JN |
1042 | struct request *rq, dev_t dev, |
1043 | sector_t from) | |
1044 | { | |
1045 | struct blk_trace *bt = q->blk_trace; | |
1046 | struct blk_io_trace_remap r; | |
1047 | ||
1048 | if (likely(!bt)) | |
1049 | return; | |
1050 | ||
1051 | r.device_from = cpu_to_be32(dev); | |
1052 | r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); | |
1053 | r.sector_from = cpu_to_be64(from); | |
1054 | ||
1055 | __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), | |
caf7df12 | 1056 | rq_data_dir(rq), 0, BLK_TA_REMAP, 0, |
ca1136c9 | 1057 | sizeof(r), &r, blk_trace_request_get_cgid(q, rq)); |
b0da3f0d JN |
1058 | } |
1059 | ||
5f3ea37c ACM |
1060 | /** |
1061 | * blk_add_driver_data - Add binary message with driver-specific data | |
1062 | * @q: queue the io is for | |
1063 | * @rq: io request | |
1064 | * @data: driver-specific data | |
1065 | * @len: length of driver-specific data | |
1066 | * | |
1067 | * Description: | |
1068 | * Some drivers might want to write driver-specific data per request. | |
1069 | * | |
1070 | **/ | |
1071 | void blk_add_driver_data(struct request_queue *q, | |
1072 | struct request *rq, | |
1073 | void *data, size_t len) | |
1074 | { | |
1075 | struct blk_trace *bt = q->blk_trace; | |
1076 | ||
1077 | if (likely(!bt)) | |
1078 | return; | |
1079 | ||
48b77ad6 | 1080 | __blk_add_trace(bt, blk_rq_trace_sector(rq), blk_rq_bytes(rq), 0, 0, |
ca1136c9 SL |
1081 | BLK_TA_DRV_DATA, 0, len, data, |
1082 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
1083 | } |
1084 | EXPORT_SYMBOL_GPL(blk_add_driver_data); | |
1085 | ||
3c289ba7 | 1086 | static void blk_register_tracepoints(void) |
5f3ea37c ACM |
1087 | { |
1088 | int ret; | |
1089 | ||
38516ab5 | 1090 | ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); |
5f3ea37c | 1091 | WARN_ON(ret); |
38516ab5 | 1092 | ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); |
5f3ea37c | 1093 | WARN_ON(ret); |
38516ab5 | 1094 | ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); |
5f3ea37c | 1095 | WARN_ON(ret); |
38516ab5 | 1096 | ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); |
5f3ea37c | 1097 | WARN_ON(ret); |
38516ab5 | 1098 | ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); |
5f3ea37c | 1099 | WARN_ON(ret); |
38516ab5 | 1100 | ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); |
5f3ea37c | 1101 | WARN_ON(ret); |
38516ab5 | 1102 | ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); |
5f3ea37c | 1103 | WARN_ON(ret); |
38516ab5 | 1104 | ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); |
5f3ea37c | 1105 | WARN_ON(ret); |
38516ab5 | 1106 | ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); |
5f3ea37c | 1107 | WARN_ON(ret); |
38516ab5 | 1108 | ret = register_trace_block_getrq(blk_add_trace_getrq, NULL); |
5f3ea37c | 1109 | WARN_ON(ret); |
38516ab5 | 1110 | ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); |
5f3ea37c | 1111 | WARN_ON(ret); |
38516ab5 | 1112 | ret = register_trace_block_plug(blk_add_trace_plug, NULL); |
5f3ea37c | 1113 | WARN_ON(ret); |
49cac01e | 1114 | ret = register_trace_block_unplug(blk_add_trace_unplug, NULL); |
5f3ea37c | 1115 | WARN_ON(ret); |
38516ab5 | 1116 | ret = register_trace_block_split(blk_add_trace_split, NULL); |
5f3ea37c | 1117 | WARN_ON(ret); |
d07335e5 | 1118 | ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); |
5f3ea37c | 1119 | WARN_ON(ret); |
38516ab5 | 1120 | ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); |
b0da3f0d | 1121 | WARN_ON(ret); |
5f3ea37c ACM |
1122 | } |
1123 | ||
1124 | static void blk_unregister_tracepoints(void) | |
1125 | { | |
38516ab5 | 1126 | unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); |
d07335e5 | 1127 | unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); |
38516ab5 | 1128 | unregister_trace_block_split(blk_add_trace_split, NULL); |
49cac01e | 1129 | unregister_trace_block_unplug(blk_add_trace_unplug, NULL); |
38516ab5 SR |
1130 | unregister_trace_block_plug(blk_add_trace_plug, NULL); |
1131 | unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); | |
1132 | unregister_trace_block_getrq(blk_add_trace_getrq, NULL); | |
1133 | unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); | |
1134 | unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); | |
1135 | unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); | |
1136 | unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); | |
1137 | unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); | |
1138 | unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); | |
1139 | unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); | |
1140 | unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); | |
1141 | unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); | |
5f3ea37c ACM |
1142 | |
1143 | tracepoint_synchronize_unregister(); | |
1144 | } | |
c71a8961 ACM |
1145 | |
1146 | /* | |
1147 | * struct blk_io_tracer formatting routines | |
1148 | */ | |
1149 | ||
1150 | static void fill_rwbs(char *rwbs, const struct blk_io_trace *t) | |
1151 | { | |
157f9c00 | 1152 | int i = 0; |
65796348 | 1153 | int tc = t->action >> BLK_TC_SHIFT; |
157f9c00 | 1154 | |
ca1136c9 | 1155 | if ((t->action & ~__BLK_TN_CGROUP) == BLK_TN_MESSAGE) { |
18cea459 LZ |
1156 | rwbs[i++] = 'N'; |
1157 | goto out; | |
1158 | } | |
1159 | ||
c09c47ca NK |
1160 | if (tc & BLK_TC_FLUSH) |
1161 | rwbs[i++] = 'F'; | |
1162 | ||
65796348 | 1163 | if (tc & BLK_TC_DISCARD) |
157f9c00 | 1164 | rwbs[i++] = 'D'; |
65796348 | 1165 | else if (tc & BLK_TC_WRITE) |
157f9c00 ACM |
1166 | rwbs[i++] = 'W'; |
1167 | else if (t->bytes) | |
1168 | rwbs[i++] = 'R'; | |
1169 | else | |
1170 | rwbs[i++] = 'N'; | |
1171 | ||
c09c47ca NK |
1172 | if (tc & BLK_TC_FUA) |
1173 | rwbs[i++] = 'F'; | |
65796348 | 1174 | if (tc & BLK_TC_AHEAD) |
157f9c00 | 1175 | rwbs[i++] = 'A'; |
65796348 | 1176 | if (tc & BLK_TC_SYNC) |
157f9c00 | 1177 | rwbs[i++] = 'S'; |
65796348 | 1178 | if (tc & BLK_TC_META) |
157f9c00 | 1179 | rwbs[i++] = 'M'; |
18cea459 | 1180 | out: |
157f9c00 | 1181 | rwbs[i] = '\0'; |
c71a8961 ACM |
1182 | } |
1183 | ||
1184 | static inline | |
1185 | const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) | |
1186 | { | |
1187 | return (const struct blk_io_trace *)ent; | |
1188 | } | |
1189 | ||
ca1136c9 SL |
1190 | static inline const void *pdu_start(const struct trace_entry *ent, bool has_cg) |
1191 | { | |
1192 | return (void *)(te_blk_io_trace(ent) + 1) + | |
1193 | (has_cg ? sizeof(union kernfs_node_id) : 0); | |
1194 | } | |
1195 | ||
1196 | static inline const void *cgid_start(const struct trace_entry *ent) | |
c71a8961 | 1197 | { |
ca1136c9 SL |
1198 | return (void *)(te_blk_io_trace(ent) + 1); |
1199 | } | |
1200 | ||
1201 | static inline int pdu_real_len(const struct trace_entry *ent, bool has_cg) | |
1202 | { | |
1203 | return te_blk_io_trace(ent)->pdu_len - | |
1204 | (has_cg ? sizeof(union kernfs_node_id) : 0); | |
c71a8961 ACM |
1205 | } |
1206 | ||
66de7792 LZ |
1207 | static inline u32 t_action(const struct trace_entry *ent) |
1208 | { | |
1209 | return te_blk_io_trace(ent)->action; | |
1210 | } | |
1211 | ||
1212 | static inline u32 t_bytes(const struct trace_entry *ent) | |
1213 | { | |
1214 | return te_blk_io_trace(ent)->bytes; | |
1215 | } | |
1216 | ||
c71a8961 ACM |
1217 | static inline u32 t_sec(const struct trace_entry *ent) |
1218 | { | |
1219 | return te_blk_io_trace(ent)->bytes >> 9; | |
1220 | } | |
1221 | ||
1222 | static inline unsigned long long t_sector(const struct trace_entry *ent) | |
1223 | { | |
1224 | return te_blk_io_trace(ent)->sector; | |
1225 | } | |
1226 | ||
1227 | static inline __u16 t_error(const struct trace_entry *ent) | |
1228 | { | |
e0dc81be | 1229 | return te_blk_io_trace(ent)->error; |
c71a8961 ACM |
1230 | } |
1231 | ||
ca1136c9 | 1232 | static __u64 get_pdu_int(const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1233 | { |
ca1136c9 | 1234 | const __u64 *val = pdu_start(ent, has_cg); |
c71a8961 ACM |
1235 | return be64_to_cpu(*val); |
1236 | } | |
1237 | ||
1238 | static void get_pdu_remap(const struct trace_entry *ent, | |
ca1136c9 | 1239 | struct blk_io_trace_remap *r, bool has_cg) |
c71a8961 | 1240 | { |
ca1136c9 | 1241 | const struct blk_io_trace_remap *__r = pdu_start(ent, has_cg); |
a42aaa3b | 1242 | __u64 sector_from = __r->sector_from; |
c71a8961 | 1243 | |
c71a8961 | 1244 | r->device_from = be32_to_cpu(__r->device_from); |
a42aaa3b AB |
1245 | r->device_to = be32_to_cpu(__r->device_to); |
1246 | r->sector_from = be64_to_cpu(sector_from); | |
c71a8961 ACM |
1247 | } |
1248 | ||
ca1136c9 SL |
1249 | typedef void (blk_log_action_t) (struct trace_iterator *iter, const char *act, |
1250 | bool has_cg); | |
b6a4b0c3 | 1251 | |
ca1136c9 SL |
1252 | static void blk_log_action_classic(struct trace_iterator *iter, const char *act, |
1253 | bool has_cg) | |
c71a8961 | 1254 | { |
c09c47ca | 1255 | char rwbs[RWBS_LEN]; |
35ac51bf LZ |
1256 | unsigned long long ts = iter->ts; |
1257 | unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); | |
c71a8961 | 1258 | unsigned secs = (unsigned long)ts; |
b6a4b0c3 | 1259 | const struct blk_io_trace *t = te_blk_io_trace(iter->ent); |
c71a8961 ACM |
1260 | |
1261 | fill_rwbs(rwbs, t); | |
1262 | ||
f4a1d08c SRRH |
1263 | trace_seq_printf(&iter->seq, |
1264 | "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", | |
1265 | MAJOR(t->device), MINOR(t->device), iter->cpu, | |
1266 | secs, nsec_rem, iter->ent->pid, act, rwbs); | |
c71a8961 ACM |
1267 | } |
1268 | ||
ca1136c9 SL |
1269 | static void blk_log_action(struct trace_iterator *iter, const char *act, |
1270 | bool has_cg) | |
c71a8961 | 1271 | { |
c09c47ca | 1272 | char rwbs[RWBS_LEN]; |
b6a4b0c3 LZ |
1273 | const struct blk_io_trace *t = te_blk_io_trace(iter->ent); |
1274 | ||
c71a8961 | 1275 | fill_rwbs(rwbs, t); |
ca1136c9 SL |
1276 | if (has_cg) { |
1277 | const union kernfs_node_id *id = cgid_start(iter->ent); | |
1278 | ||
69fd5c39 SL |
1279 | if (blk_tracer_flags.val & TRACE_BLK_OPT_CGNAME) { |
1280 | char blkcg_name_buf[NAME_MAX + 1] = "<...>"; | |
1281 | ||
1282 | cgroup_path_from_kernfs_id(id, blkcg_name_buf, | |
1283 | sizeof(blkcg_name_buf)); | |
1284 | trace_seq_printf(&iter->seq, "%3d,%-3d %s %2s %3s ", | |
1285 | MAJOR(t->device), MINOR(t->device), | |
1286 | blkcg_name_buf, act, rwbs); | |
1287 | } else | |
1288 | trace_seq_printf(&iter->seq, | |
1289 | "%3d,%-3d %x,%-x %2s %3s ", | |
ca1136c9 SL |
1290 | MAJOR(t->device), MINOR(t->device), |
1291 | id->ino, id->generation, act, rwbs); | |
1292 | } else | |
1293 | trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", | |
1294 | MAJOR(t->device), MINOR(t->device), act, rwbs); | |
c71a8961 ACM |
1295 | } |
1296 | ||
ca1136c9 SL |
1297 | static void blk_log_dump_pdu(struct trace_seq *s, |
1298 | const struct trace_entry *ent, bool has_cg) | |
66de7792 | 1299 | { |
04986257 | 1300 | const unsigned char *pdu_buf; |
66de7792 | 1301 | int pdu_len; |
f4a1d08c | 1302 | int i, end; |
66de7792 | 1303 | |
ca1136c9 SL |
1304 | pdu_buf = pdu_start(ent, has_cg); |
1305 | pdu_len = pdu_real_len(ent, has_cg); | |
66de7792 LZ |
1306 | |
1307 | if (!pdu_len) | |
f4a1d08c | 1308 | return; |
66de7792 LZ |
1309 | |
1310 | /* find the last zero that needs to be printed */ | |
1311 | for (end = pdu_len - 1; end >= 0; end--) | |
1312 | if (pdu_buf[end]) | |
1313 | break; | |
1314 | end++; | |
1315 | ||
f4a1d08c | 1316 | trace_seq_putc(s, '('); |
66de7792 LZ |
1317 | |
1318 | for (i = 0; i < pdu_len; i++) { | |
1319 | ||
f4a1d08c SRRH |
1320 | trace_seq_printf(s, "%s%02x", |
1321 | i == 0 ? "" : " ", pdu_buf[i]); | |
66de7792 LZ |
1322 | |
1323 | /* | |
1324 | * stop when the rest is just zeroes and indicate so | |
1325 | * with a ".." appended | |
1326 | */ | |
f4a1d08c SRRH |
1327 | if (i == end && end != pdu_len - 1) { |
1328 | trace_seq_puts(s, " ..) "); | |
1329 | return; | |
1330 | } | |
66de7792 LZ |
1331 | } |
1332 | ||
f4a1d08c | 1333 | trace_seq_puts(s, ") "); |
66de7792 LZ |
1334 | } |
1335 | ||
ca1136c9 | 1336 | static void blk_log_generic(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1337 | { |
4ca53085 SR |
1338 | char cmd[TASK_COMM_LEN]; |
1339 | ||
1340 | trace_find_cmdline(ent->pid, cmd); | |
c71a8961 | 1341 | |
66de7792 | 1342 | if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { |
f4a1d08c | 1343 | trace_seq_printf(s, "%u ", t_bytes(ent)); |
ca1136c9 | 1344 | blk_log_dump_pdu(s, ent, has_cg); |
f4a1d08c | 1345 | trace_seq_printf(s, "[%s]\n", cmd); |
66de7792 LZ |
1346 | } else { |
1347 | if (t_sec(ent)) | |
f4a1d08c | 1348 | trace_seq_printf(s, "%llu + %u [%s]\n", |
66de7792 | 1349 | t_sector(ent), t_sec(ent), cmd); |
f4a1d08c SRRH |
1350 | else |
1351 | trace_seq_printf(s, "[%s]\n", cmd); | |
66de7792 | 1352 | } |
c71a8961 ACM |
1353 | } |
1354 | ||
f4a1d08c | 1355 | static void blk_log_with_error(struct trace_seq *s, |
ca1136c9 | 1356 | const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1357 | { |
66de7792 | 1358 | if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { |
ca1136c9 | 1359 | blk_log_dump_pdu(s, ent, has_cg); |
f4a1d08c | 1360 | trace_seq_printf(s, "[%d]\n", t_error(ent)); |
66de7792 LZ |
1361 | } else { |
1362 | if (t_sec(ent)) | |
f4a1d08c SRRH |
1363 | trace_seq_printf(s, "%llu + %u [%d]\n", |
1364 | t_sector(ent), | |
1365 | t_sec(ent), t_error(ent)); | |
1366 | else | |
1367 | trace_seq_printf(s, "%llu [%d]\n", | |
1368 | t_sector(ent), t_error(ent)); | |
66de7792 | 1369 | } |
c71a8961 ACM |
1370 | } |
1371 | ||
ca1136c9 | 1372 | static void blk_log_remap(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1373 | { |
a42aaa3b | 1374 | struct blk_io_trace_remap r = { .device_from = 0, }; |
c71a8961 | 1375 | |
ca1136c9 | 1376 | get_pdu_remap(ent, &r, has_cg); |
f4a1d08c SRRH |
1377 | trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", |
1378 | t_sector(ent), t_sec(ent), | |
1379 | MAJOR(r.device_from), MINOR(r.device_from), | |
1380 | (unsigned long long)r.sector_from); | |
c71a8961 ACM |
1381 | } |
1382 | ||
ca1136c9 | 1383 | static void blk_log_plug(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1384 | { |
4ca53085 SR |
1385 | char cmd[TASK_COMM_LEN]; |
1386 | ||
1387 | trace_find_cmdline(ent->pid, cmd); | |
1388 | ||
f4a1d08c | 1389 | trace_seq_printf(s, "[%s]\n", cmd); |
c71a8961 ACM |
1390 | } |
1391 | ||
ca1136c9 | 1392 | static void blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1393 | { |
4ca53085 SR |
1394 | char cmd[TASK_COMM_LEN]; |
1395 | ||
1396 | trace_find_cmdline(ent->pid, cmd); | |
1397 | ||
ca1136c9 | 1398 | trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent, has_cg)); |
c71a8961 ACM |
1399 | } |
1400 | ||
ca1136c9 | 1401 | static void blk_log_split(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1402 | { |
4ca53085 SR |
1403 | char cmd[TASK_COMM_LEN]; |
1404 | ||
1405 | trace_find_cmdline(ent->pid, cmd); | |
1406 | ||
f4a1d08c | 1407 | trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), |
ca1136c9 | 1408 | get_pdu_int(ent, has_cg), cmd); |
c71a8961 ACM |
1409 | } |
1410 | ||
ca1136c9 SL |
1411 | static void blk_log_msg(struct trace_seq *s, const struct trace_entry *ent, |
1412 | bool has_cg) | |
18cea459 | 1413 | { |
18cea459 | 1414 | |
ca1136c9 SL |
1415 | trace_seq_putmem(s, pdu_start(ent, has_cg), |
1416 | pdu_real_len(ent, has_cg)); | |
f4a1d08c | 1417 | trace_seq_putc(s, '\n'); |
18cea459 LZ |
1418 | } |
1419 | ||
c71a8961 ACM |
1420 | /* |
1421 | * struct tracer operations | |
1422 | */ | |
1423 | ||
1424 | static void blk_tracer_print_header(struct seq_file *m) | |
1425 | { | |
1426 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) | |
1427 | return; | |
1428 | seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" | |
1429 | "# | | | | | |\n"); | |
1430 | } | |
1431 | ||
1432 | static void blk_tracer_start(struct trace_array *tr) | |
1433 | { | |
ad5dd549 | 1434 | blk_tracer_enabled = true; |
c71a8961 ACM |
1435 | } |
1436 | ||
1437 | static int blk_tracer_init(struct trace_array *tr) | |
1438 | { | |
1439 | blk_tr = tr; | |
1440 | blk_tracer_start(tr); | |
c71a8961 ACM |
1441 | return 0; |
1442 | } | |
1443 | ||
1444 | static void blk_tracer_stop(struct trace_array *tr) | |
1445 | { | |
ad5dd549 | 1446 | blk_tracer_enabled = false; |
c71a8961 ACM |
1447 | } |
1448 | ||
1449 | static void blk_tracer_reset(struct trace_array *tr) | |
1450 | { | |
c71a8961 ACM |
1451 | blk_tracer_stop(tr); |
1452 | } | |
1453 | ||
e4955c99 | 1454 | static const struct { |
c71a8961 | 1455 | const char *act[2]; |
ca1136c9 SL |
1456 | void (*print)(struct trace_seq *s, const struct trace_entry *ent, |
1457 | bool has_cg); | |
e4955c99 | 1458 | } what2act[] = { |
ef18012b | 1459 | [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, |
c71a8961 ACM |
1460 | [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, |
1461 | [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, | |
1462 | [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, | |
1463 | [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, | |
1464 | [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, | |
1465 | [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, | |
1466 | [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, | |
1467 | [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, | |
1468 | [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, | |
49cac01e | 1469 | [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, |
c71a8961 ACM |
1470 | [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, |
1471 | [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, | |
1472 | [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, | |
1473 | [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, | |
1474 | }; | |
1475 | ||
b6a4b0c3 LZ |
1476 | static enum print_line_t print_one_line(struct trace_iterator *iter, |
1477 | bool classic) | |
c71a8961 | 1478 | { |
983f938a | 1479 | struct trace_array *tr = iter->tr; |
2c9b238e | 1480 | struct trace_seq *s = &iter->seq; |
b6a4b0c3 LZ |
1481 | const struct blk_io_trace *t; |
1482 | u16 what; | |
b6a4b0c3 LZ |
1483 | bool long_act; |
1484 | blk_log_action_t *log_action; | |
ca1136c9 | 1485 | bool has_cg; |
c71a8961 | 1486 | |
b6a4b0c3 | 1487 | t = te_blk_io_trace(iter->ent); |
ca1136c9 | 1488 | what = (t->action & ((1 << BLK_TC_SHIFT) - 1)) & ~__BLK_TA_CGROUP; |
983f938a | 1489 | long_act = !!(tr->trace_flags & TRACE_ITER_VERBOSE); |
b6a4b0c3 | 1490 | log_action = classic ? &blk_log_action_classic : &blk_log_action; |
ca1136c9 | 1491 | has_cg = t->action & __BLK_TA_CGROUP; |
08a06b83 | 1492 | |
ca1136c9 SL |
1493 | if ((t->action & ~__BLK_TN_CGROUP) == BLK_TN_MESSAGE) { |
1494 | log_action(iter, long_act ? "message" : "m", has_cg); | |
1495 | blk_log_msg(s, iter->ent, has_cg); | |
b7d7641e | 1496 | return trace_handle_return(s); |
18cea459 LZ |
1497 | } |
1498 | ||
eb08f8eb | 1499 | if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) |
f4a1d08c | 1500 | trace_seq_printf(s, "Unknown action %x\n", what); |
c71a8961 | 1501 | else { |
ca1136c9 SL |
1502 | log_action(iter, what2act[what].act[long_act], has_cg); |
1503 | what2act[what].print(s, iter->ent, has_cg); | |
c71a8961 | 1504 | } |
f4a1d08c SRRH |
1505 | |
1506 | return trace_handle_return(s); | |
c71a8961 ACM |
1507 | } |
1508 | ||
b6a4b0c3 | 1509 | static enum print_line_t blk_trace_event_print(struct trace_iterator *iter, |
a9a57763 | 1510 | int flags, struct trace_event *event) |
b6a4b0c3 | 1511 | { |
b6a4b0c3 LZ |
1512 | return print_one_line(iter, false); |
1513 | } | |
1514 | ||
f4a1d08c | 1515 | static void blk_trace_synthesize_old_trace(struct trace_iterator *iter) |
08a06b83 ACM |
1516 | { |
1517 | struct trace_seq *s = &iter->seq; | |
1518 | struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; | |
1519 | const int offset = offsetof(struct blk_io_trace, sector); | |
1520 | struct blk_io_trace old = { | |
1521 | .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, | |
6c051ce0 | 1522 | .time = iter->ts, |
08a06b83 ACM |
1523 | }; |
1524 | ||
f4a1d08c SRRH |
1525 | trace_seq_putmem(s, &old, offset); |
1526 | trace_seq_putmem(s, &t->sector, | |
1527 | sizeof(old) - offset + t->pdu_len); | |
08a06b83 ACM |
1528 | } |
1529 | ||
ae7462b4 | 1530 | static enum print_line_t |
a9a57763 SR |
1531 | blk_trace_event_print_binary(struct trace_iterator *iter, int flags, |
1532 | struct trace_event *event) | |
08a06b83 | 1533 | { |
f4a1d08c SRRH |
1534 | blk_trace_synthesize_old_trace(iter); |
1535 | ||
1536 | return trace_handle_return(&iter->seq); | |
08a06b83 ACM |
1537 | } |
1538 | ||
c71a8961 ACM |
1539 | static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) |
1540 | { | |
c71a8961 ACM |
1541 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) |
1542 | return TRACE_TYPE_UNHANDLED; | |
1543 | ||
b6a4b0c3 | 1544 | return print_one_line(iter, true); |
c71a8961 ACM |
1545 | } |
1546 | ||
8c1a49ae SRRH |
1547 | static int |
1548 | blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) | |
f3948f88 LZ |
1549 | { |
1550 | /* don't output context-info for blk_classic output */ | |
1551 | if (bit == TRACE_BLK_OPT_CLASSIC) { | |
1552 | if (set) | |
983f938a | 1553 | tr->trace_flags &= ~TRACE_ITER_CONTEXT_INFO; |
f3948f88 | 1554 | else |
983f938a | 1555 | tr->trace_flags |= TRACE_ITER_CONTEXT_INFO; |
f3948f88 LZ |
1556 | } |
1557 | return 0; | |
1558 | } | |
1559 | ||
c71a8961 ACM |
1560 | static struct tracer blk_tracer __read_mostly = { |
1561 | .name = "blk", | |
1562 | .init = blk_tracer_init, | |
1563 | .reset = blk_tracer_reset, | |
1564 | .start = blk_tracer_start, | |
1565 | .stop = blk_tracer_stop, | |
1566 | .print_header = blk_tracer_print_header, | |
1567 | .print_line = blk_tracer_print_line, | |
1568 | .flags = &blk_tracer_flags, | |
f3948f88 | 1569 | .set_flag = blk_tracer_set_flag, |
c71a8961 ACM |
1570 | }; |
1571 | ||
a9a57763 | 1572 | static struct trace_event_functions trace_blk_event_funcs = { |
c71a8961 | 1573 | .trace = blk_trace_event_print, |
08a06b83 | 1574 | .binary = blk_trace_event_print_binary, |
c71a8961 ACM |
1575 | }; |
1576 | ||
a9a57763 SR |
1577 | static struct trace_event trace_blk_event = { |
1578 | .type = TRACE_BLK, | |
1579 | .funcs = &trace_blk_event_funcs, | |
1580 | }; | |
1581 | ||
c71a8961 ACM |
1582 | static int __init init_blk_tracer(void) |
1583 | { | |
9023c930 | 1584 | if (!register_trace_event(&trace_blk_event)) { |
a395d6a7 | 1585 | pr_warn("Warning: could not register block events\n"); |
c71a8961 ACM |
1586 | return 1; |
1587 | } | |
1588 | ||
1589 | if (register_tracer(&blk_tracer) != 0) { | |
a395d6a7 | 1590 | pr_warn("Warning: could not register the block tracer\n"); |
9023c930 | 1591 | unregister_trace_event(&trace_blk_event); |
c71a8961 ACM |
1592 | return 1; |
1593 | } | |
1594 | ||
1595 | return 0; | |
1596 | } | |
1597 | ||
1598 | device_initcall(init_blk_tracer); | |
1599 | ||
1600 | static int blk_trace_remove_queue(struct request_queue *q) | |
1601 | { | |
1602 | struct blk_trace *bt; | |
1603 | ||
1604 | bt = xchg(&q->blk_trace, NULL); | |
1605 | if (bt == NULL) | |
1606 | return -EINVAL; | |
1607 | ||
a6da0024 | 1608 | put_probe_ref(); |
ad5dd549 | 1609 | blk_trace_free(bt); |
c71a8961 ACM |
1610 | return 0; |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * Setup everything required to start tracing | |
1615 | */ | |
9908c309 LZ |
1616 | static int blk_trace_setup_queue(struct request_queue *q, |
1617 | struct block_device *bdev) | |
c71a8961 | 1618 | { |
cdea01b2 | 1619 | struct blk_trace *bt = NULL; |
18cea459 | 1620 | int ret = -ENOMEM; |
c71a8961 | 1621 | |
c71a8961 ACM |
1622 | bt = kzalloc(sizeof(*bt), GFP_KERNEL); |
1623 | if (!bt) | |
15152e44 | 1624 | return -ENOMEM; |
c71a8961 | 1625 | |
18cea459 LZ |
1626 | bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); |
1627 | if (!bt->msg_data) | |
1628 | goto free_bt; | |
1629 | ||
9908c309 | 1630 | bt->dev = bdev->bd_dev; |
c71a8961 | 1631 | bt->act_mask = (u16)-1; |
9908c309 LZ |
1632 | |
1633 | blk_trace_setup_lba(bt, bdev); | |
c71a8961 | 1634 | |
cdea01b2 DB |
1635 | ret = -EBUSY; |
1636 | if (cmpxchg(&q->blk_trace, NULL, bt)) | |
18cea459 | 1637 | goto free_bt; |
15152e44 | 1638 | |
a6da0024 | 1639 | get_probe_ref(); |
c71a8961 | 1640 | return 0; |
18cea459 LZ |
1641 | |
1642 | free_bt: | |
1643 | blk_trace_free(bt); | |
1644 | return ret; | |
c71a8961 ACM |
1645 | } |
1646 | ||
1647 | /* | |
1648 | * sysfs interface to enable and configure tracing | |
1649 | */ | |
1650 | ||
c71a8961 ACM |
1651 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, |
1652 | struct device_attribute *attr, | |
1653 | char *buf); | |
1654 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | |
1655 | struct device_attribute *attr, | |
1656 | const char *buf, size_t count); | |
1657 | #define BLK_TRACE_DEVICE_ATTR(_name) \ | |
1658 | DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ | |
1659 | sysfs_blk_trace_attr_show, \ | |
1660 | sysfs_blk_trace_attr_store) | |
1661 | ||
cd649b8b | 1662 | static BLK_TRACE_DEVICE_ATTR(enable); |
c71a8961 ACM |
1663 | static BLK_TRACE_DEVICE_ATTR(act_mask); |
1664 | static BLK_TRACE_DEVICE_ATTR(pid); | |
1665 | static BLK_TRACE_DEVICE_ATTR(start_lba); | |
1666 | static BLK_TRACE_DEVICE_ATTR(end_lba); | |
1667 | ||
1668 | static struct attribute *blk_trace_attrs[] = { | |
1669 | &dev_attr_enable.attr, | |
1670 | &dev_attr_act_mask.attr, | |
1671 | &dev_attr_pid.attr, | |
1672 | &dev_attr_start_lba.attr, | |
1673 | &dev_attr_end_lba.attr, | |
1674 | NULL | |
1675 | }; | |
1676 | ||
1677 | struct attribute_group blk_trace_attr_group = { | |
1678 | .name = "trace", | |
1679 | .attrs = blk_trace_attrs, | |
1680 | }; | |
1681 | ||
09341997 LZ |
1682 | static const struct { |
1683 | int mask; | |
1684 | const char *str; | |
1685 | } mask_maps[] = { | |
1686 | { BLK_TC_READ, "read" }, | |
1687 | { BLK_TC_WRITE, "write" }, | |
c09c47ca | 1688 | { BLK_TC_FLUSH, "flush" }, |
09341997 LZ |
1689 | { BLK_TC_SYNC, "sync" }, |
1690 | { BLK_TC_QUEUE, "queue" }, | |
1691 | { BLK_TC_REQUEUE, "requeue" }, | |
1692 | { BLK_TC_ISSUE, "issue" }, | |
1693 | { BLK_TC_COMPLETE, "complete" }, | |
1694 | { BLK_TC_FS, "fs" }, | |
1695 | { BLK_TC_PC, "pc" }, | |
8d1547e0 | 1696 | { BLK_TC_NOTIFY, "notify" }, |
09341997 LZ |
1697 | { BLK_TC_AHEAD, "ahead" }, |
1698 | { BLK_TC_META, "meta" }, | |
1699 | { BLK_TC_DISCARD, "discard" }, | |
1700 | { BLK_TC_DRV_DATA, "drv_data" }, | |
c09c47ca | 1701 | { BLK_TC_FUA, "fua" }, |
09341997 LZ |
1702 | }; |
1703 | ||
1704 | static int blk_trace_str2mask(const char *str) | |
c71a8961 | 1705 | { |
09341997 | 1706 | int i; |
c71a8961 | 1707 | int mask = 0; |
9eb85125 | 1708 | char *buf, *s, *token; |
c71a8961 | 1709 | |
9eb85125 LZ |
1710 | buf = kstrdup(str, GFP_KERNEL); |
1711 | if (buf == NULL) | |
c71a8961 | 1712 | return -ENOMEM; |
9eb85125 | 1713 | s = strstrip(buf); |
c71a8961 ACM |
1714 | |
1715 | while (1) { | |
09341997 LZ |
1716 | token = strsep(&s, ","); |
1717 | if (token == NULL) | |
c71a8961 ACM |
1718 | break; |
1719 | ||
09341997 LZ |
1720 | if (*token == '\0') |
1721 | continue; | |
1722 | ||
1723 | for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { | |
1724 | if (strcasecmp(token, mask_maps[i].str) == 0) { | |
1725 | mask |= mask_maps[i].mask; | |
1726 | break; | |
1727 | } | |
1728 | } | |
1729 | if (i == ARRAY_SIZE(mask_maps)) { | |
1730 | mask = -EINVAL; | |
1731 | break; | |
1732 | } | |
c71a8961 | 1733 | } |
9eb85125 | 1734 | kfree(buf); |
c71a8961 ACM |
1735 | |
1736 | return mask; | |
1737 | } | |
1738 | ||
09341997 LZ |
1739 | static ssize_t blk_trace_mask2str(char *buf, int mask) |
1740 | { | |
1741 | int i; | |
1742 | char *p = buf; | |
1743 | ||
1744 | for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { | |
1745 | if (mask & mask_maps[i].mask) { | |
1746 | p += sprintf(p, "%s%s", | |
1747 | (p == buf) ? "" : ",", mask_maps[i].str); | |
1748 | } | |
1749 | } | |
1750 | *p++ = '\n'; | |
1751 | ||
1752 | return p - buf; | |
1753 | } | |
1754 | ||
b125130b LZ |
1755 | static struct request_queue *blk_trace_get_queue(struct block_device *bdev) |
1756 | { | |
1757 | if (bdev->bd_disk == NULL) | |
1758 | return NULL; | |
1759 | ||
1760 | return bdev_get_queue(bdev); | |
1761 | } | |
1762 | ||
c71a8961 ACM |
1763 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, |
1764 | struct device_attribute *attr, | |
1765 | char *buf) | |
1766 | { | |
1767 | struct hd_struct *p = dev_to_part(dev); | |
1768 | struct request_queue *q; | |
1769 | struct block_device *bdev; | |
1770 | ssize_t ret = -ENXIO; | |
1771 | ||
c71a8961 ACM |
1772 | bdev = bdget(part_devt(p)); |
1773 | if (bdev == NULL) | |
01b284f9 | 1774 | goto out; |
c71a8961 | 1775 | |
b125130b | 1776 | q = blk_trace_get_queue(bdev); |
c71a8961 ACM |
1777 | if (q == NULL) |
1778 | goto out_bdput; | |
b125130b | 1779 | |
5acb3cc2 | 1780 | mutex_lock(&q->blk_trace_mutex); |
cd649b8b LZ |
1781 | |
1782 | if (attr == &dev_attr_enable) { | |
1783 | ret = sprintf(buf, "%u\n", !!q->blk_trace); | |
1784 | goto out_unlock_bdev; | |
1785 | } | |
1786 | ||
c71a8961 ACM |
1787 | if (q->blk_trace == NULL) |
1788 | ret = sprintf(buf, "disabled\n"); | |
1789 | else if (attr == &dev_attr_act_mask) | |
09341997 | 1790 | ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); |
c71a8961 ACM |
1791 | else if (attr == &dev_attr_pid) |
1792 | ret = sprintf(buf, "%u\n", q->blk_trace->pid); | |
1793 | else if (attr == &dev_attr_start_lba) | |
1794 | ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); | |
1795 | else if (attr == &dev_attr_end_lba) | |
1796 | ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); | |
cd649b8b LZ |
1797 | |
1798 | out_unlock_bdev: | |
5acb3cc2 | 1799 | mutex_unlock(&q->blk_trace_mutex); |
c71a8961 ACM |
1800 | out_bdput: |
1801 | bdput(bdev); | |
01b284f9 | 1802 | out: |
c71a8961 ACM |
1803 | return ret; |
1804 | } | |
1805 | ||
1806 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | |
1807 | struct device_attribute *attr, | |
1808 | const char *buf, size_t count) | |
1809 | { | |
1810 | struct block_device *bdev; | |
1811 | struct request_queue *q; | |
1812 | struct hd_struct *p; | |
1813 | u64 value; | |
09341997 | 1814 | ssize_t ret = -EINVAL; |
c71a8961 ACM |
1815 | |
1816 | if (count == 0) | |
1817 | goto out; | |
1818 | ||
1819 | if (attr == &dev_attr_act_mask) { | |
5f339453 | 1820 | if (kstrtoull(buf, 0, &value)) { |
c71a8961 | 1821 | /* Assume it is a list of trace category names */ |
09341997 LZ |
1822 | ret = blk_trace_str2mask(buf); |
1823 | if (ret < 0) | |
c71a8961 | 1824 | goto out; |
09341997 | 1825 | value = ret; |
c71a8961 | 1826 | } |
5f339453 | 1827 | } else if (kstrtoull(buf, 0, &value)) |
c71a8961 ACM |
1828 | goto out; |
1829 | ||
09341997 LZ |
1830 | ret = -ENXIO; |
1831 | ||
c71a8961 ACM |
1832 | p = dev_to_part(dev); |
1833 | bdev = bdget(part_devt(p)); | |
1834 | if (bdev == NULL) | |
01b284f9 | 1835 | goto out; |
c71a8961 | 1836 | |
b125130b | 1837 | q = blk_trace_get_queue(bdev); |
c71a8961 ACM |
1838 | if (q == NULL) |
1839 | goto out_bdput; | |
1840 | ||
5acb3cc2 | 1841 | mutex_lock(&q->blk_trace_mutex); |
cd649b8b LZ |
1842 | |
1843 | if (attr == &dev_attr_enable) { | |
1844 | if (value) | |
9908c309 | 1845 | ret = blk_trace_setup_queue(q, bdev); |
cd649b8b LZ |
1846 | else |
1847 | ret = blk_trace_remove_queue(q); | |
1848 | goto out_unlock_bdev; | |
1849 | } | |
1850 | ||
c71a8961 ACM |
1851 | ret = 0; |
1852 | if (q->blk_trace == NULL) | |
9908c309 | 1853 | ret = blk_trace_setup_queue(q, bdev); |
c71a8961 ACM |
1854 | |
1855 | if (ret == 0) { | |
1856 | if (attr == &dev_attr_act_mask) | |
1857 | q->blk_trace->act_mask = value; | |
1858 | else if (attr == &dev_attr_pid) | |
1859 | q->blk_trace->pid = value; | |
1860 | else if (attr == &dev_attr_start_lba) | |
1861 | q->blk_trace->start_lba = value; | |
1862 | else if (attr == &dev_attr_end_lba) | |
1863 | q->blk_trace->end_lba = value; | |
c71a8961 | 1864 | } |
cd649b8b LZ |
1865 | |
1866 | out_unlock_bdev: | |
5acb3cc2 | 1867 | mutex_unlock(&q->blk_trace_mutex); |
c71a8961 ACM |
1868 | out_bdput: |
1869 | bdput(bdev); | |
c71a8961 | 1870 | out: |
cd649b8b | 1871 | return ret ? ret : count; |
c71a8961 | 1872 | } |
cd649b8b | 1873 | |
1d54ad6d LZ |
1874 | int blk_trace_init_sysfs(struct device *dev) |
1875 | { | |
1876 | return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); | |
1877 | } | |
1878 | ||
48c0d4d4 ZK |
1879 | void blk_trace_remove_sysfs(struct device *dev) |
1880 | { | |
1881 | sysfs_remove_group(&dev->kobj, &blk_trace_attr_group); | |
1882 | } | |
1883 | ||
55782138 LZ |
1884 | #endif /* CONFIG_BLK_DEV_IO_TRACE */ |
1885 | ||
1886 | #ifdef CONFIG_EVENT_TRACING | |
1887 | ||
ef295ecf | 1888 | void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes) |
55782138 LZ |
1889 | { |
1890 | int i = 0; | |
1891 | ||
ef295ecf | 1892 | if (op & REQ_PREFLUSH) |
c09c47ca NK |
1893 | rwbs[i++] = 'F'; |
1894 | ||
ef295ecf | 1895 | switch (op & REQ_OP_MASK) { |
1b9a9ab7 MC |
1896 | case REQ_OP_WRITE: |
1897 | case REQ_OP_WRITE_SAME: | |
55782138 | 1898 | rwbs[i++] = 'W'; |
1b9a9ab7 MC |
1899 | break; |
1900 | case REQ_OP_DISCARD: | |
55782138 | 1901 | rwbs[i++] = 'D'; |
1b9a9ab7 | 1902 | break; |
288dab8a CH |
1903 | case REQ_OP_SECURE_ERASE: |
1904 | rwbs[i++] = 'D'; | |
1905 | rwbs[i++] = 'E'; | |
1906 | break; | |
3a5e02ce MC |
1907 | case REQ_OP_FLUSH: |
1908 | rwbs[i++] = 'F'; | |
1909 | break; | |
1b9a9ab7 | 1910 | case REQ_OP_READ: |
55782138 | 1911 | rwbs[i++] = 'R'; |
1b9a9ab7 MC |
1912 | break; |
1913 | default: | |
55782138 | 1914 | rwbs[i++] = 'N'; |
1b9a9ab7 | 1915 | } |
55782138 | 1916 | |
ef295ecf | 1917 | if (op & REQ_FUA) |
c09c47ca | 1918 | rwbs[i++] = 'F'; |
ef295ecf | 1919 | if (op & REQ_RAHEAD) |
55782138 | 1920 | rwbs[i++] = 'A'; |
ef295ecf | 1921 | if (op & REQ_SYNC) |
55782138 | 1922 | rwbs[i++] = 'S'; |
ef295ecf | 1923 | if (op & REQ_META) |
55782138 LZ |
1924 | rwbs[i++] = 'M'; |
1925 | ||
1926 | rwbs[i] = '\0'; | |
1927 | } | |
9ca8f8e5 | 1928 | EXPORT_SYMBOL_GPL(blk_fill_rwbs); |
55782138 | 1929 | |
55782138 LZ |
1930 | #endif /* CONFIG_EVENT_TRACING */ |
1931 |