Commit | Line | Data |
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91c1e6ba | 1 | // SPDX-License-Identifier: GPL-2.0 |
2056a782 | 2 | /* |
0fe23479 | 3 | * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk> |
2056a782 | 4 | * |
2056a782 | 5 | */ |
1b0b2836 LC |
6 | |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
8 | ||
2056a782 JA |
9 | #include <linux/kernel.h> |
10 | #include <linux/blkdev.h> | |
11 | #include <linux/blktrace_api.h> | |
12 | #include <linux/percpu.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/mutex.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
2056a782 | 16 | #include <linux/debugfs.h> |
6e5fdeed | 17 | #include <linux/export.h> |
be1c6341 | 18 | #include <linux/time.h> |
939b3669 | 19 | #include <linux/uaccess.h> |
a404d557 | 20 | #include <linux/list.h> |
ca1136c9 | 21 | #include <linux/blk-cgroup.h> |
55782138 | 22 | |
18fbda91 OS |
23 | #include "../../block/blk.h" |
24 | ||
55782138 LZ |
25 | #include <trace/events/block.h> |
26 | ||
2db270a8 | 27 | #include "trace_output.h" |
2056a782 | 28 | |
55782138 LZ |
29 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
30 | ||
2056a782 JA |
31 | static unsigned int blktrace_seq __read_mostly = 1; |
32 | ||
c71a8961 | 33 | static struct trace_array *blk_tr; |
5006ea73 | 34 | static bool blk_tracer_enabled __read_mostly; |
c71a8961 | 35 | |
a404d557 JK |
36 | static LIST_HEAD(running_trace_list); |
37 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(running_trace_lock); | |
38 | ||
c71a8961 | 39 | /* Select an alternative, minimalistic output than the original one */ |
ef18012b | 40 | #define TRACE_BLK_OPT_CLASSIC 0x1 |
ca1136c9 | 41 | #define TRACE_BLK_OPT_CGROUP 0x2 |
69fd5c39 | 42 | #define TRACE_BLK_OPT_CGNAME 0x4 |
c71a8961 ACM |
43 | |
44 | static struct tracer_opt blk_tracer_opts[] = { | |
45 | /* Default disable the minimalistic output */ | |
157f9c00 | 46 | { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) }, |
ca1136c9 SL |
47 | #ifdef CONFIG_BLK_CGROUP |
48 | { TRACER_OPT(blk_cgroup, TRACE_BLK_OPT_CGROUP) }, | |
69fd5c39 | 49 | { TRACER_OPT(blk_cgname, TRACE_BLK_OPT_CGNAME) }, |
ca1136c9 | 50 | #endif |
c71a8961 ACM |
51 | { } |
52 | }; | |
53 | ||
54 | static struct tracer_flags blk_tracer_flags = { | |
55 | .val = 0, | |
56 | .opts = blk_tracer_opts, | |
57 | }; | |
58 | ||
5f3ea37c | 59 | /* Global reference count of probes */ |
a6da0024 JA |
60 | static DEFINE_MUTEX(blk_probe_mutex); |
61 | static int blk_probes_ref; | |
5f3ea37c | 62 | |
3c289ba7 | 63 | static void blk_register_tracepoints(void); |
5f3ea37c ACM |
64 | static void blk_unregister_tracepoints(void); |
65 | ||
be1c6341 OK |
66 | /* |
67 | * Send out a notify message. | |
68 | */ | |
a863055b | 69 | static void trace_note(struct blk_trace *bt, pid_t pid, int action, |
67c0496e | 70 | const void *data, size_t len, u64 cgid) |
be1c6341 OK |
71 | { |
72 | struct blk_io_trace *t; | |
18cea459 | 73 | struct ring_buffer_event *event = NULL; |
13292494 | 74 | struct trace_buffer *buffer = NULL; |
18cea459 LZ |
75 | int pc = 0; |
76 | int cpu = smp_processor_id(); | |
77 | bool blk_tracer = blk_tracer_enabled; | |
67c0496e | 78 | ssize_t cgid_len = cgid ? sizeof(cgid) : 0; |
18cea459 LZ |
79 | |
80 | if (blk_tracer) { | |
1c5eb448 | 81 | buffer = blk_tr->array_buffer.buffer; |
18cea459 | 82 | pc = preempt_count(); |
e77405ad | 83 | event = trace_buffer_lock_reserve(buffer, TRACE_BLK, |
ca1136c9 | 84 | sizeof(*t) + len + cgid_len, |
18cea459 LZ |
85 | 0, pc); |
86 | if (!event) | |
87 | return; | |
88 | t = ring_buffer_event_data(event); | |
89 | goto record_it; | |
90 | } | |
be1c6341 | 91 | |
c71a8961 ACM |
92 | if (!bt->rchan) |
93 | return; | |
94 | ||
ca1136c9 | 95 | t = relay_reserve(bt->rchan, sizeof(*t) + len + cgid_len); |
d3d9d2a5 | 96 | if (t) { |
d3d9d2a5 | 97 | t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; |
2997c8c4 | 98 | t->time = ktime_to_ns(ktime_get()); |
18cea459 | 99 | record_it: |
d3d9d2a5 | 100 | t->device = bt->dev; |
ca1136c9 | 101 | t->action = action | (cgid ? __BLK_TN_CGROUP : 0); |
d3d9d2a5 JA |
102 | t->pid = pid; |
103 | t->cpu = cpu; | |
ca1136c9 | 104 | t->pdu_len = len + cgid_len; |
67c0496e TH |
105 | if (cgid_len) |
106 | memcpy((void *)t + sizeof(*t), &cgid, cgid_len); | |
ca1136c9 | 107 | memcpy((void *) t + sizeof(*t) + cgid_len, data, len); |
18cea459 LZ |
108 | |
109 | if (blk_tracer) | |
b7f0c959 | 110 | trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc); |
d3d9d2a5 | 111 | } |
be1c6341 OK |
112 | } |
113 | ||
2056a782 JA |
114 | /* |
115 | * Send out a notify for this process, if we haven't done so since a trace | |
116 | * started | |
117 | */ | |
a404d557 | 118 | static void trace_note_tsk(struct task_struct *tsk) |
2056a782 | 119 | { |
a404d557 JK |
120 | unsigned long flags; |
121 | struct blk_trace *bt; | |
122 | ||
a863055b | 123 | tsk->btrace_seq = blktrace_seq; |
a404d557 JK |
124 | spin_lock_irqsave(&running_trace_lock, flags); |
125 | list_for_each_entry(bt, &running_trace_list, running_list) { | |
126 | trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, | |
67c0496e | 127 | sizeof(tsk->comm), 0); |
a404d557 JK |
128 | } |
129 | spin_unlock_irqrestore(&running_trace_lock, flags); | |
be1c6341 | 130 | } |
2056a782 | 131 | |
be1c6341 OK |
132 | static void trace_note_time(struct blk_trace *bt) |
133 | { | |
59a37f8b | 134 | struct timespec64 now; |
be1c6341 OK |
135 | unsigned long flags; |
136 | u32 words[2]; | |
137 | ||
59a37f8b AB |
138 | /* need to check user space to see if this breaks in y2038 or y2106 */ |
139 | ktime_get_real_ts64(&now); | |
140 | words[0] = (u32)now.tv_sec; | |
be1c6341 OK |
141 | words[1] = now.tv_nsec; |
142 | ||
143 | local_irq_save(flags); | |
67c0496e | 144 | trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words), 0); |
be1c6341 | 145 | local_irq_restore(flags); |
2056a782 JA |
146 | } |
147 | ||
35fe6d76 SL |
148 | void __trace_note_message(struct blk_trace *bt, struct blkcg *blkcg, |
149 | const char *fmt, ...) | |
9d5f09a4 AB |
150 | { |
151 | int n; | |
152 | va_list args; | |
14a73f54 | 153 | unsigned long flags; |
64565911 | 154 | char *buf; |
9d5f09a4 | 155 | |
18cea459 LZ |
156 | if (unlikely(bt->trace_state != Blktrace_running && |
157 | !blk_tracer_enabled)) | |
c71a8961 ACM |
158 | return; |
159 | ||
490da40d TM |
160 | /* |
161 | * If the BLK_TC_NOTIFY action mask isn't set, don't send any note | |
162 | * message to the trace. | |
163 | */ | |
164 | if (!(bt->act_mask & BLK_TC_NOTIFY)) | |
165 | return; | |
166 | ||
14a73f54 | 167 | local_irq_save(flags); |
d8a0349c | 168 | buf = this_cpu_ptr(bt->msg_data); |
9d5f09a4 | 169 | va_start(args, fmt); |
64565911 | 170 | n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); |
9d5f09a4 AB |
171 | va_end(args); |
172 | ||
35fe6d76 SL |
173 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP)) |
174 | blkcg = NULL; | |
175 | #ifdef CONFIG_BLK_CGROUP | |
870c153c | 176 | trace_note(bt, current->pid, BLK_TN_MESSAGE, buf, n, |
74321038 | 177 | blkcg ? cgroup_id(blkcg->css.cgroup) : 1); |
35fe6d76 | 178 | #else |
870c153c | 179 | trace_note(bt, current->pid, BLK_TN_MESSAGE, buf, n, 0); |
35fe6d76 | 180 | #endif |
14a73f54 | 181 | local_irq_restore(flags); |
9d5f09a4 AB |
182 | } |
183 | EXPORT_SYMBOL_GPL(__trace_note_message); | |
184 | ||
2056a782 JA |
185 | static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, |
186 | pid_t pid) | |
187 | { | |
188 | if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) | |
189 | return 1; | |
d0deef5b | 190 | if (sector && (sector < bt->start_lba || sector > bt->end_lba)) |
2056a782 JA |
191 | return 1; |
192 | if (bt->pid && pid != bt->pid) | |
193 | return 1; | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Data direction bit lookup | |
200 | */ | |
e4955c99 LZ |
201 | static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), |
202 | BLK_TC_ACT(BLK_TC_WRITE) }; | |
2056a782 | 203 | |
7b6d91da | 204 | #define BLK_TC_RAHEAD BLK_TC_AHEAD |
28a8f0d3 | 205 | #define BLK_TC_PREFLUSH BLK_TC_FLUSH |
7b6d91da | 206 | |
35ba8f70 | 207 | /* The ilog2() calls fall out because they're constant */ |
7b6d91da CH |
208 | #define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \ |
209 | (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name)) | |
2056a782 JA |
210 | |
211 | /* | |
212 | * The worker for the various blk_add_trace*() types. Fills out a | |
213 | * blk_io_trace structure and places it in a per-cpu subbuffer. | |
214 | */ | |
5f3ea37c | 215 | static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, |
1b9a9ab7 | 216 | int op, int op_flags, u32 what, int error, int pdu_len, |
67c0496e | 217 | void *pdu_data, u64 cgid) |
2056a782 JA |
218 | { |
219 | struct task_struct *tsk = current; | |
c71a8961 | 220 | struct ring_buffer_event *event = NULL; |
13292494 | 221 | struct trace_buffer *buffer = NULL; |
2056a782 | 222 | struct blk_io_trace *t; |
0a987751 | 223 | unsigned long flags = 0; |
2056a782 JA |
224 | unsigned long *sequence; |
225 | pid_t pid; | |
c71a8961 | 226 | int cpu, pc = 0; |
18cea459 | 227 | bool blk_tracer = blk_tracer_enabled; |
67c0496e | 228 | ssize_t cgid_len = cgid ? sizeof(cgid) : 0; |
2056a782 | 229 | |
18cea459 | 230 | if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) |
2056a782 JA |
231 | return; |
232 | ||
1b9a9ab7 MC |
233 | what |= ddir_act[op_is_write(op) ? WRITE : READ]; |
234 | what |= MASK_TC_BIT(op_flags, SYNC); | |
235 | what |= MASK_TC_BIT(op_flags, RAHEAD); | |
236 | what |= MASK_TC_BIT(op_flags, META); | |
28a8f0d3 | 237 | what |= MASK_TC_BIT(op_flags, PREFLUSH); |
1b9a9ab7 | 238 | what |= MASK_TC_BIT(op_flags, FUA); |
7afafc8a | 239 | if (op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE) |
1b9a9ab7 | 240 | what |= BLK_TC_ACT(BLK_TC_DISCARD); |
3a5e02ce MC |
241 | if (op == REQ_OP_FLUSH) |
242 | what |= BLK_TC_ACT(BLK_TC_FLUSH); | |
ca1136c9 SL |
243 | if (cgid) |
244 | what |= __BLK_TA_CGROUP; | |
2056a782 JA |
245 | |
246 | pid = tsk->pid; | |
d0deef5b | 247 | if (act_log_check(bt, what, sector, pid)) |
2056a782 | 248 | return; |
c71a8961 ACM |
249 | cpu = raw_smp_processor_id(); |
250 | ||
18cea459 | 251 | if (blk_tracer) { |
c71a8961 ACM |
252 | tracing_record_cmdline(current); |
253 | ||
1c5eb448 | 254 | buffer = blk_tr->array_buffer.buffer; |
51a763dd | 255 | pc = preempt_count(); |
e77405ad | 256 | event = trace_buffer_lock_reserve(buffer, TRACE_BLK, |
ca1136c9 | 257 | sizeof(*t) + pdu_len + cgid_len, |
51a763dd | 258 | 0, pc); |
c71a8961 ACM |
259 | if (!event) |
260 | return; | |
51a763dd | 261 | t = ring_buffer_event_data(event); |
c71a8961 ACM |
262 | goto record_it; |
263 | } | |
2056a782 | 264 | |
a404d557 JK |
265 | if (unlikely(tsk->btrace_seq != blktrace_seq)) |
266 | trace_note_tsk(tsk); | |
267 | ||
2056a782 JA |
268 | /* |
269 | * A word about the locking here - we disable interrupts to reserve | |
270 | * some space in the relay per-cpu buffer, to prevent an irq | |
14a73f54 | 271 | * from coming in and stepping on our toes. |
2056a782 JA |
272 | */ |
273 | local_irq_save(flags); | |
ca1136c9 | 274 | t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len + cgid_len); |
2056a782 | 275 | if (t) { |
2056a782 JA |
276 | sequence = per_cpu_ptr(bt->sequence, cpu); |
277 | ||
278 | t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; | |
279 | t->sequence = ++(*sequence); | |
2997c8c4 | 280 | t->time = ktime_to_ns(ktime_get()); |
c71a8961 | 281 | record_it: |
08a06b83 | 282 | /* |
939b3669 ACM |
283 | * These two are not needed in ftrace as they are in the |
284 | * generic trace_entry, filled by tracing_generic_entry_update, | |
285 | * but for the trace_event->bin() synthesizer benefit we do it | |
286 | * here too. | |
287 | */ | |
288 | t->cpu = cpu; | |
289 | t->pid = pid; | |
08a06b83 | 290 | |
2056a782 JA |
291 | t->sector = sector; |
292 | t->bytes = bytes; | |
293 | t->action = what; | |
2056a782 | 294 | t->device = bt->dev; |
2056a782 | 295 | t->error = error; |
ca1136c9 | 296 | t->pdu_len = pdu_len + cgid_len; |
2056a782 | 297 | |
ca1136c9 | 298 | if (cgid_len) |
67c0496e | 299 | memcpy((void *)t + sizeof(*t), &cgid, cgid_len); |
2056a782 | 300 | if (pdu_len) |
ca1136c9 | 301 | memcpy((void *)t + sizeof(*t) + cgid_len, pdu_data, pdu_len); |
c71a8961 | 302 | |
18cea459 | 303 | if (blk_tracer) { |
b7f0c959 | 304 | trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc); |
c71a8961 ACM |
305 | return; |
306 | } | |
2056a782 JA |
307 | } |
308 | ||
309 | local_irq_restore(flags); | |
310 | } | |
311 | ||
ad5dd549 | 312 | static void blk_trace_free(struct blk_trace *bt) |
2056a782 | 313 | { |
02c62304 | 314 | debugfs_remove(bt->msg_file); |
2056a782 | 315 | debugfs_remove(bt->dropped_file); |
f48fc4d3 | 316 | relay_close(bt->rchan); |
39cbb602 | 317 | debugfs_remove(bt->dir); |
2056a782 | 318 | free_percpu(bt->sequence); |
64565911 | 319 | free_percpu(bt->msg_data); |
2056a782 | 320 | kfree(bt); |
ad5dd549 LZ |
321 | } |
322 | ||
a6da0024 JA |
323 | static void get_probe_ref(void) |
324 | { | |
325 | mutex_lock(&blk_probe_mutex); | |
326 | if (++blk_probes_ref == 1) | |
327 | blk_register_tracepoints(); | |
328 | mutex_unlock(&blk_probe_mutex); | |
329 | } | |
330 | ||
331 | static void put_probe_ref(void) | |
332 | { | |
333 | mutex_lock(&blk_probe_mutex); | |
334 | if (!--blk_probes_ref) | |
335 | blk_unregister_tracepoints(); | |
336 | mutex_unlock(&blk_probe_mutex); | |
337 | } | |
338 | ||
ad5dd549 LZ |
339 | static void blk_trace_cleanup(struct blk_trace *bt) |
340 | { | |
c780e86d | 341 | synchronize_rcu(); |
ad5dd549 | 342 | blk_trace_free(bt); |
a6da0024 | 343 | put_probe_ref(); |
2056a782 JA |
344 | } |
345 | ||
1f2cac10 | 346 | static int __blk_trace_remove(struct request_queue *q) |
2056a782 JA |
347 | { |
348 | struct blk_trace *bt; | |
349 | ||
c3dbe541 | 350 | bt = rcu_replace_pointer(q->blk_trace, NULL, |
85e0cbbb | 351 | lockdep_is_held(&q->debugfs_mutex)); |
2056a782 JA |
352 | if (!bt) |
353 | return -EINVAL; | |
354 | ||
55547204 | 355 | if (bt->trace_state != Blktrace_running) |
2056a782 JA |
356 | blk_trace_cleanup(bt); |
357 | ||
358 | return 0; | |
359 | } | |
1f2cac10 JA |
360 | |
361 | int blk_trace_remove(struct request_queue *q) | |
362 | { | |
363 | int ret; | |
364 | ||
85e0cbbb | 365 | mutex_lock(&q->debugfs_mutex); |
1f2cac10 | 366 | ret = __blk_trace_remove(q); |
85e0cbbb | 367 | mutex_unlock(&q->debugfs_mutex); |
1f2cac10 JA |
368 | |
369 | return ret; | |
370 | } | |
6da127ad | 371 | EXPORT_SYMBOL_GPL(blk_trace_remove); |
2056a782 | 372 | |
2056a782 JA |
373 | static ssize_t blk_dropped_read(struct file *filp, char __user *buffer, |
374 | size_t count, loff_t *ppos) | |
375 | { | |
376 | struct blk_trace *bt = filp->private_data; | |
377 | char buf[16]; | |
378 | ||
379 | snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); | |
380 | ||
381 | return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); | |
382 | } | |
383 | ||
2b8693c0 | 384 | static const struct file_operations blk_dropped_fops = { |
2056a782 | 385 | .owner = THIS_MODULE, |
234e3405 | 386 | .open = simple_open, |
2056a782 | 387 | .read = blk_dropped_read, |
6038f373 | 388 | .llseek = default_llseek, |
2056a782 JA |
389 | }; |
390 | ||
02c62304 AB |
391 | static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, |
392 | size_t count, loff_t *ppos) | |
393 | { | |
394 | char *msg; | |
395 | struct blk_trace *bt; | |
396 | ||
7635b03a | 397 | if (count >= BLK_TN_MAX_MSG) |
02c62304 AB |
398 | return -EINVAL; |
399 | ||
16e5c1fc AV |
400 | msg = memdup_user_nul(buffer, count); |
401 | if (IS_ERR(msg)) | |
402 | return PTR_ERR(msg); | |
02c62304 | 403 | |
02c62304 | 404 | bt = filp->private_data; |
35fe6d76 | 405 | __trace_note_message(bt, NULL, "%s", msg); |
02c62304 AB |
406 | kfree(msg); |
407 | ||
408 | return count; | |
409 | } | |
410 | ||
411 | static const struct file_operations blk_msg_fops = { | |
412 | .owner = THIS_MODULE, | |
234e3405 | 413 | .open = simple_open, |
02c62304 | 414 | .write = blk_msg_write, |
6038f373 | 415 | .llseek = noop_llseek, |
02c62304 AB |
416 | }; |
417 | ||
2056a782 JA |
418 | /* |
419 | * Keep track of how many times we encountered a full subbuffer, to aid | |
420 | * the user space app in telling how many lost events there were. | |
421 | */ | |
422 | static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, | |
423 | void *prev_subbuf, size_t prev_padding) | |
424 | { | |
425 | struct blk_trace *bt; | |
426 | ||
427 | if (!relay_buf_full(buf)) | |
428 | return 1; | |
429 | ||
430 | bt = buf->chan->private_data; | |
431 | atomic_inc(&bt->dropped); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | static int blk_remove_buf_file_callback(struct dentry *dentry) | |
436 | { | |
437 | debugfs_remove(dentry); | |
f48fc4d3 | 438 | |
2056a782 JA |
439 | return 0; |
440 | } | |
441 | ||
442 | static struct dentry *blk_create_buf_file_callback(const char *filename, | |
443 | struct dentry *parent, | |
f4ae40a6 | 444 | umode_t mode, |
2056a782 JA |
445 | struct rchan_buf *buf, |
446 | int *is_global) | |
447 | { | |
448 | return debugfs_create_file(filename, mode, parent, buf, | |
449 | &relay_file_operations); | |
450 | } | |
451 | ||
452 | static struct rchan_callbacks blk_relay_callbacks = { | |
453 | .subbuf_start = blk_subbuf_start_callback, | |
454 | .create_buf_file = blk_create_buf_file_callback, | |
455 | .remove_buf_file = blk_remove_buf_file_callback, | |
456 | }; | |
457 | ||
9908c309 LZ |
458 | static void blk_trace_setup_lba(struct blk_trace *bt, |
459 | struct block_device *bdev) | |
460 | { | |
461 | struct hd_struct *part = NULL; | |
462 | ||
463 | if (bdev) | |
464 | part = bdev->bd_part; | |
465 | ||
466 | if (part) { | |
467 | bt->start_lba = part->start_sect; | |
468 | bt->end_lba = part->start_sect + part->nr_sects; | |
469 | } else { | |
470 | bt->start_lba = 0; | |
471 | bt->end_lba = -1ULL; | |
472 | } | |
473 | } | |
474 | ||
2056a782 JA |
475 | /* |
476 | * Setup everything required to start tracing | |
477 | */ | |
a428d314 OS |
478 | static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
479 | struct block_device *bdev, | |
480 | struct blk_user_trace_setup *buts) | |
2056a782 | 481 | { |
cdea01b2 | 482 | struct blk_trace *bt = NULL; |
2056a782 | 483 | struct dentry *dir = NULL; |
ff14417c | 484 | int ret; |
2056a782 | 485 | |
85e0cbbb | 486 | lockdep_assert_held(&q->debugfs_mutex); |
a67549c8 | 487 | |
171044d4 | 488 | if (!buts->buf_size || !buts->buf_nr) |
2056a782 JA |
489 | return -EINVAL; |
490 | ||
0497b345 JA |
491 | strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); |
492 | buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; | |
2056a782 JA |
493 | |
494 | /* | |
495 | * some device names have larger paths - convert the slashes | |
496 | * to underscores for this to work as expected | |
497 | */ | |
ff14417c | 498 | strreplace(buts->name, '/', '_'); |
2056a782 | 499 | |
1b0b2836 LC |
500 | /* |
501 | * bdev can be NULL, as with scsi-generic, this is a helpful as | |
502 | * we can be. | |
503 | */ | |
c3dbe541 | 504 | if (rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 505 | lockdep_is_held(&q->debugfs_mutex))) { |
1b0b2836 LC |
506 | pr_warn("Concurrent blktraces are not allowed on %s\n", |
507 | buts->name); | |
508 | return -EBUSY; | |
509 | } | |
510 | ||
2056a782 JA |
511 | bt = kzalloc(sizeof(*bt), GFP_KERNEL); |
512 | if (!bt) | |
ad5dd549 | 513 | return -ENOMEM; |
2056a782 | 514 | |
ad5dd549 | 515 | ret = -ENOMEM; |
2056a782 JA |
516 | bt->sequence = alloc_percpu(unsigned long); |
517 | if (!bt->sequence) | |
518 | goto err; | |
519 | ||
313e458f | 520 | bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); |
64565911 JA |
521 | if (!bt->msg_data) |
522 | goto err; | |
523 | ||
bad8e64f | 524 | /* |
85e0cbbb LC |
525 | * When tracing the whole disk reuse the existing debugfs directory |
526 | * created by the block layer on init. For partitions block devices, | |
bad8e64f LC |
527 | * and scsi-generic block devices we create a temporary new debugfs |
528 | * directory that will be removed once the trace ends. | |
529 | */ | |
fa01b1e9 | 530 | if (bdev && !bdev_is_partition(bdev)) |
bad8e64f LC |
531 | dir = q->debugfs_dir; |
532 | else | |
6ac93117 | 533 | bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root); |
2056a782 | 534 | |
b431ef83 LC |
535 | /* |
536 | * As blktrace relies on debugfs for its interface the debugfs directory | |
537 | * is required, contrary to the usual mantra of not checking for debugfs | |
538 | * files or directories. | |
539 | */ | |
540 | if (IS_ERR_OR_NULL(dir)) { | |
541 | pr_warn("debugfs_dir not present for %s so skipping\n", | |
542 | buts->name); | |
543 | ret = -ENOENT; | |
544 | goto err; | |
545 | } | |
546 | ||
6da127ad | 547 | bt->dev = dev; |
2056a782 | 548 | atomic_set(&bt->dropped, 0); |
a404d557 | 549 | INIT_LIST_HEAD(&bt->running_list); |
2056a782 JA |
550 | |
551 | ret = -EIO; | |
939b3669 ACM |
552 | bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, |
553 | &blk_dropped_fops); | |
2056a782 | 554 | |
02c62304 | 555 | bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); |
02c62304 | 556 | |
171044d4 AB |
557 | bt->rchan = relay_open("trace", dir, buts->buf_size, |
558 | buts->buf_nr, &blk_relay_callbacks, bt); | |
2056a782 JA |
559 | if (!bt->rchan) |
560 | goto err; | |
2056a782 | 561 | |
171044d4 | 562 | bt->act_mask = buts->act_mask; |
2056a782 JA |
563 | if (!bt->act_mask) |
564 | bt->act_mask = (u16) -1; | |
565 | ||
9908c309 | 566 | blk_trace_setup_lba(bt, bdev); |
2056a782 | 567 | |
d0deef5b SD |
568 | /* overwrite with user settings */ |
569 | if (buts->start_lba) | |
570 | bt->start_lba = buts->start_lba; | |
571 | if (buts->end_lba) | |
572 | bt->end_lba = buts->end_lba; | |
573 | ||
171044d4 | 574 | bt->pid = buts->pid; |
2056a782 JA |
575 | bt->trace_state = Blktrace_setup; |
576 | ||
c3dbe541 | 577 | rcu_assign_pointer(q->blk_trace, bt); |
a6da0024 | 578 | get_probe_ref(); |
cbe28296 | 579 | |
6ac93117 | 580 | ret = 0; |
2056a782 | 581 | err: |
6ac93117 OS |
582 | if (ret) |
583 | blk_trace_free(bt); | |
2056a782 JA |
584 | return ret; |
585 | } | |
171044d4 | 586 | |
1f2cac10 JA |
587 | static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
588 | struct block_device *bdev, char __user *arg) | |
171044d4 AB |
589 | { |
590 | struct blk_user_trace_setup buts; | |
591 | int ret; | |
592 | ||
593 | ret = copy_from_user(&buts, arg, sizeof(buts)); | |
594 | if (ret) | |
595 | return -EFAULT; | |
596 | ||
d0deef5b | 597 | ret = do_blk_trace_setup(q, name, dev, bdev, &buts); |
171044d4 AB |
598 | if (ret) |
599 | return ret; | |
600 | ||
9a8c28c8 | 601 | if (copy_to_user(arg, &buts, sizeof(buts))) { |
2967acbb | 602 | __blk_trace_remove(q); |
171044d4 | 603 | return -EFAULT; |
9a8c28c8 | 604 | } |
171044d4 AB |
605 | return 0; |
606 | } | |
1f2cac10 JA |
607 | |
608 | int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, | |
609 | struct block_device *bdev, | |
610 | char __user *arg) | |
611 | { | |
612 | int ret; | |
613 | ||
85e0cbbb | 614 | mutex_lock(&q->debugfs_mutex); |
1f2cac10 | 615 | ret = __blk_trace_setup(q, name, dev, bdev, arg); |
85e0cbbb | 616 | mutex_unlock(&q->debugfs_mutex); |
1f2cac10 JA |
617 | |
618 | return ret; | |
619 | } | |
6da127ad | 620 | EXPORT_SYMBOL_GPL(blk_trace_setup); |
2056a782 | 621 | |
62c2a7d9 AB |
622 | #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) |
623 | static int compat_blk_trace_setup(struct request_queue *q, char *name, | |
624 | dev_t dev, struct block_device *bdev, | |
625 | char __user *arg) | |
626 | { | |
627 | struct blk_user_trace_setup buts; | |
628 | struct compat_blk_user_trace_setup cbuts; | |
629 | int ret; | |
630 | ||
631 | if (copy_from_user(&cbuts, arg, sizeof(cbuts))) | |
632 | return -EFAULT; | |
633 | ||
634 | buts = (struct blk_user_trace_setup) { | |
635 | .act_mask = cbuts.act_mask, | |
636 | .buf_size = cbuts.buf_size, | |
637 | .buf_nr = cbuts.buf_nr, | |
638 | .start_lba = cbuts.start_lba, | |
639 | .end_lba = cbuts.end_lba, | |
640 | .pid = cbuts.pid, | |
641 | }; | |
62c2a7d9 AB |
642 | |
643 | ret = do_blk_trace_setup(q, name, dev, bdev, &buts); | |
644 | if (ret) | |
645 | return ret; | |
646 | ||
f8c5e944 | 647 | if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) { |
2967acbb | 648 | __blk_trace_remove(q); |
62c2a7d9 AB |
649 | return -EFAULT; |
650 | } | |
651 | ||
652 | return 0; | |
653 | } | |
654 | #endif | |
655 | ||
1f2cac10 | 656 | static int __blk_trace_startstop(struct request_queue *q, int start) |
2056a782 | 657 | { |
2056a782 | 658 | int ret; |
c780e86d | 659 | struct blk_trace *bt; |
2056a782 | 660 | |
c780e86d | 661 | bt = rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 662 | lockdep_is_held(&q->debugfs_mutex)); |
939b3669 | 663 | if (bt == NULL) |
2056a782 JA |
664 | return -EINVAL; |
665 | ||
666 | /* | |
667 | * For starting a trace, we can transition from a setup or stopped | |
668 | * trace. For stopping a trace, the state must be running | |
669 | */ | |
670 | ret = -EINVAL; | |
671 | if (start) { | |
672 | if (bt->trace_state == Blktrace_setup || | |
673 | bt->trace_state == Blktrace_stopped) { | |
674 | blktrace_seq++; | |
675 | smp_mb(); | |
676 | bt->trace_state = Blktrace_running; | |
a404d557 JK |
677 | spin_lock_irq(&running_trace_lock); |
678 | list_add(&bt->running_list, &running_trace_list); | |
679 | spin_unlock_irq(&running_trace_lock); | |
be1c6341 OK |
680 | |
681 | trace_note_time(bt); | |
2056a782 JA |
682 | ret = 0; |
683 | } | |
684 | } else { | |
685 | if (bt->trace_state == Blktrace_running) { | |
686 | bt->trace_state = Blktrace_stopped; | |
a404d557 JK |
687 | spin_lock_irq(&running_trace_lock); |
688 | list_del_init(&bt->running_list); | |
689 | spin_unlock_irq(&running_trace_lock); | |
2056a782 JA |
690 | relay_flush(bt->rchan); |
691 | ret = 0; | |
692 | } | |
693 | } | |
694 | ||
695 | return ret; | |
696 | } | |
1f2cac10 JA |
697 | |
698 | int blk_trace_startstop(struct request_queue *q, int start) | |
699 | { | |
700 | int ret; | |
701 | ||
85e0cbbb | 702 | mutex_lock(&q->debugfs_mutex); |
1f2cac10 | 703 | ret = __blk_trace_startstop(q, start); |
85e0cbbb | 704 | mutex_unlock(&q->debugfs_mutex); |
1f2cac10 JA |
705 | |
706 | return ret; | |
707 | } | |
6da127ad | 708 | EXPORT_SYMBOL_GPL(blk_trace_startstop); |
2056a782 | 709 | |
5acb3cc2 WL |
710 | /* |
711 | * When reading or writing the blktrace sysfs files, the references to the | |
712 | * opened sysfs or device files should prevent the underlying block device | |
713 | * from being removed. So no further delete protection is really needed. | |
714 | */ | |
715 | ||
2056a782 JA |
716 | /** |
717 | * blk_trace_ioctl: - handle the ioctls associated with tracing | |
718 | * @bdev: the block device | |
ef18012b | 719 | * @cmd: the ioctl cmd |
2056a782 JA |
720 | * @arg: the argument data, if any |
721 | * | |
722 | **/ | |
723 | int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) | |
724 | { | |
165125e1 | 725 | struct request_queue *q; |
2056a782 | 726 | int ret, start = 0; |
6da127ad | 727 | char b[BDEVNAME_SIZE]; |
2056a782 JA |
728 | |
729 | q = bdev_get_queue(bdev); | |
730 | if (!q) | |
731 | return -ENXIO; | |
732 | ||
85e0cbbb | 733 | mutex_lock(&q->debugfs_mutex); |
2056a782 JA |
734 | |
735 | switch (cmd) { | |
736 | case BLKTRACESETUP: | |
f36f21ec | 737 | bdevname(bdev, b); |
1f2cac10 | 738 | ret = __blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); |
2056a782 | 739 | break; |
62c2a7d9 AB |
740 | #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) |
741 | case BLKTRACESETUP32: | |
742 | bdevname(bdev, b); | |
743 | ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); | |
744 | break; | |
745 | #endif | |
2056a782 JA |
746 | case BLKTRACESTART: |
747 | start = 1; | |
df561f66 | 748 | fallthrough; |
2056a782 | 749 | case BLKTRACESTOP: |
1f2cac10 | 750 | ret = __blk_trace_startstop(q, start); |
2056a782 JA |
751 | break; |
752 | case BLKTRACETEARDOWN: | |
1f2cac10 | 753 | ret = __blk_trace_remove(q); |
2056a782 JA |
754 | break; |
755 | default: | |
756 | ret = -ENOTTY; | |
757 | break; | |
758 | } | |
759 | ||
85e0cbbb | 760 | mutex_unlock(&q->debugfs_mutex); |
2056a782 JA |
761 | return ret; |
762 | } | |
763 | ||
764 | /** | |
765 | * blk_trace_shutdown: - stop and cleanup trace structures | |
766 | * @q: the request queue associated with the device | |
767 | * | |
768 | **/ | |
165125e1 | 769 | void blk_trace_shutdown(struct request_queue *q) |
2056a782 | 770 | { |
85e0cbbb | 771 | mutex_lock(&q->debugfs_mutex); |
c780e86d | 772 | if (rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 773 | lockdep_is_held(&q->debugfs_mutex))) { |
1f2cac10 JA |
774 | __blk_trace_startstop(q, 0); |
775 | __blk_trace_remove(q); | |
6c5c9341 | 776 | } |
1f2cac10 | 777 | |
85e0cbbb | 778 | mutex_unlock(&q->debugfs_mutex); |
2056a782 | 779 | } |
5f3ea37c | 780 | |
ca1136c9 | 781 | #ifdef CONFIG_BLK_CGROUP |
67c0496e | 782 | static u64 blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) |
ca1136c9 | 783 | { |
c780e86d | 784 | struct blk_trace *bt; |
ca1136c9 | 785 | |
c780e86d JK |
786 | /* We don't use the 'bt' value here except as an optimization... */ |
787 | bt = rcu_dereference_protected(q->blk_trace, 1); | |
ca1136c9 | 788 | if (!bt || !(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP)) |
67c0496e | 789 | return 0; |
ca1136c9 | 790 | |
db6638d7 | 791 | if (!bio->bi_blkg) |
67c0496e | 792 | return 0; |
74321038 | 793 | return cgroup_id(bio_blkcg(bio)->css.cgroup); |
ca1136c9 SL |
794 | } |
795 | #else | |
e75ad2cc | 796 | static u64 blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) |
ca1136c9 | 797 | { |
67c0496e | 798 | return 0; |
ca1136c9 SL |
799 | } |
800 | #endif | |
801 | ||
67c0496e | 802 | static u64 |
ca1136c9 SL |
803 | blk_trace_request_get_cgid(struct request_queue *q, struct request *rq) |
804 | { | |
805 | if (!rq->bio) | |
67c0496e | 806 | return 0; |
ca1136c9 SL |
807 | /* Use the first bio */ |
808 | return blk_trace_bio_get_cgid(q, rq->bio); | |
809 | } | |
810 | ||
5f3ea37c ACM |
811 | /* |
812 | * blktrace probes | |
813 | */ | |
814 | ||
815 | /** | |
816 | * blk_add_trace_rq - Add a trace for a request oriented action | |
5f3ea37c | 817 | * @rq: the source request |
caf7df12 | 818 | * @error: return status to log |
af5040da | 819 | * @nr_bytes: number of completed bytes |
5f3ea37c | 820 | * @what: the action |
ca1136c9 | 821 | * @cgid: the cgroup info |
5f3ea37c ACM |
822 | * |
823 | * Description: | |
824 | * Records an action against a request. Will log the bio offset + size. | |
825 | * | |
826 | **/ | |
caf7df12 | 827 | static void blk_add_trace_rq(struct request *rq, int error, |
67c0496e | 828 | unsigned int nr_bytes, u32 what, u64 cgid) |
5f3ea37c | 829 | { |
c780e86d | 830 | struct blk_trace *bt; |
5f3ea37c | 831 | |
c780e86d JK |
832 | rcu_read_lock(); |
833 | bt = rcu_dereference(rq->q->blk_trace); | |
834 | if (likely(!bt)) { | |
835 | rcu_read_unlock(); | |
5f3ea37c | 836 | return; |
c780e86d | 837 | } |
5f3ea37c | 838 | |
57292b58 | 839 | if (blk_rq_is_passthrough(rq)) |
5f3ea37c | 840 | what |= BLK_TC_ACT(BLK_TC_PC); |
48b77ad6 | 841 | else |
5f3ea37c | 842 | what |= BLK_TC_ACT(BLK_TC_FS); |
48b77ad6 CH |
843 | |
844 | __blk_add_trace(bt, blk_rq_trace_sector(rq), nr_bytes, req_op(rq), | |
ca1136c9 | 845 | rq->cmd_flags, what, error, 0, NULL, cgid); |
c780e86d | 846 | rcu_read_unlock(); |
5f3ea37c ACM |
847 | } |
848 | ||
38516ab5 SR |
849 | static void blk_add_trace_rq_insert(void *ignore, |
850 | struct request_queue *q, struct request *rq) | |
5f3ea37c | 851 | { |
ca1136c9 SL |
852 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_INSERT, |
853 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
854 | } |
855 | ||
38516ab5 SR |
856 | static void blk_add_trace_rq_issue(void *ignore, |
857 | struct request_queue *q, struct request *rq) | |
5f3ea37c | 858 | { |
ca1136c9 SL |
859 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_ISSUE, |
860 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
861 | } |
862 | ||
f3bdc62f JK |
863 | static void blk_add_trace_rq_merge(void *ignore, |
864 | struct request_queue *q, struct request *rq) | |
865 | { | |
866 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_BACKMERGE, | |
867 | blk_trace_request_get_cgid(q, rq)); | |
868 | } | |
869 | ||
38516ab5 SR |
870 | static void blk_add_trace_rq_requeue(void *ignore, |
871 | struct request_queue *q, | |
939b3669 | 872 | struct request *rq) |
5f3ea37c | 873 | { |
ca1136c9 SL |
874 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_REQUEUE, |
875 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
876 | } |
877 | ||
caf7df12 CH |
878 | static void blk_add_trace_rq_complete(void *ignore, struct request *rq, |
879 | int error, unsigned int nr_bytes) | |
5f3ea37c | 880 | { |
ca1136c9 SL |
881 | blk_add_trace_rq(rq, error, nr_bytes, BLK_TA_COMPLETE, |
882 | blk_trace_request_get_cgid(rq->q, rq)); | |
5f3ea37c ACM |
883 | } |
884 | ||
885 | /** | |
886 | * blk_add_trace_bio - Add a trace for a bio oriented action | |
887 | * @q: queue the io is for | |
888 | * @bio: the source bio | |
889 | * @what: the action | |
797a455d | 890 | * @error: error, if any |
5f3ea37c ACM |
891 | * |
892 | * Description: | |
893 | * Records an action against a bio. Will log the bio offset + size. | |
894 | * | |
895 | **/ | |
896 | static void blk_add_trace_bio(struct request_queue *q, struct bio *bio, | |
1690102d | 897 | u32 what, int error) |
5f3ea37c | 898 | { |
c780e86d | 899 | struct blk_trace *bt; |
5f3ea37c | 900 | |
c780e86d JK |
901 | rcu_read_lock(); |
902 | bt = rcu_dereference(q->blk_trace); | |
903 | if (likely(!bt)) { | |
904 | rcu_read_unlock(); | |
5f3ea37c | 905 | return; |
c780e86d | 906 | } |
5f3ea37c | 907 | |
4f024f37 | 908 | __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, |
1690102d MPS |
909 | bio_op(bio), bio->bi_opf, what, error, 0, NULL, |
910 | blk_trace_bio_get_cgid(q, bio)); | |
c780e86d | 911 | rcu_read_unlock(); |
5f3ea37c ACM |
912 | } |
913 | ||
38516ab5 SR |
914 | static void blk_add_trace_bio_bounce(void *ignore, |
915 | struct request_queue *q, struct bio *bio) | |
5f3ea37c | 916 | { |
1690102d | 917 | blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0); |
5f3ea37c ACM |
918 | } |
919 | ||
0a82a8d1 | 920 | static void blk_add_trace_bio_complete(void *ignore, |
d24de76a | 921 | struct request_queue *q, struct bio *bio) |
5f3ea37c | 922 | { |
d24de76a CH |
923 | blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, |
924 | blk_status_to_errno(bio->bi_status)); | |
5f3ea37c ACM |
925 | } |
926 | ||
38516ab5 SR |
927 | static void blk_add_trace_bio_backmerge(void *ignore, |
928 | struct request_queue *q, | |
8c1cf6bb | 929 | struct request *rq, |
939b3669 | 930 | struct bio *bio) |
5f3ea37c | 931 | { |
1690102d | 932 | blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0); |
5f3ea37c ACM |
933 | } |
934 | ||
38516ab5 SR |
935 | static void blk_add_trace_bio_frontmerge(void *ignore, |
936 | struct request_queue *q, | |
8c1cf6bb | 937 | struct request *rq, |
939b3669 | 938 | struct bio *bio) |
5f3ea37c | 939 | { |
1690102d | 940 | blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0); |
5f3ea37c ACM |
941 | } |
942 | ||
38516ab5 SR |
943 | static void blk_add_trace_bio_queue(void *ignore, |
944 | struct request_queue *q, struct bio *bio) | |
5f3ea37c | 945 | { |
1690102d | 946 | blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0); |
5f3ea37c ACM |
947 | } |
948 | ||
38516ab5 SR |
949 | static void blk_add_trace_getrq(void *ignore, |
950 | struct request_queue *q, | |
939b3669 | 951 | struct bio *bio, int rw) |
5f3ea37c ACM |
952 | { |
953 | if (bio) | |
1690102d | 954 | blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0); |
5f3ea37c | 955 | else { |
c780e86d | 956 | struct blk_trace *bt; |
5f3ea37c | 957 | |
c780e86d JK |
958 | rcu_read_lock(); |
959 | bt = rcu_dereference(q->blk_trace); | |
5f3ea37c | 960 | if (bt) |
1b9a9ab7 | 961 | __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_GETRQ, 0, 0, |
67c0496e | 962 | NULL, 0); |
c780e86d | 963 | rcu_read_unlock(); |
5f3ea37c ACM |
964 | } |
965 | } | |
966 | ||
967 | ||
38516ab5 SR |
968 | static void blk_add_trace_sleeprq(void *ignore, |
969 | struct request_queue *q, | |
939b3669 | 970 | struct bio *bio, int rw) |
5f3ea37c ACM |
971 | { |
972 | if (bio) | |
1690102d | 973 | blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0); |
5f3ea37c | 974 | else { |
c780e86d | 975 | struct blk_trace *bt; |
5f3ea37c | 976 | |
c780e86d JK |
977 | rcu_read_lock(); |
978 | bt = rcu_dereference(q->blk_trace); | |
5f3ea37c | 979 | if (bt) |
1b9a9ab7 | 980 | __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_SLEEPRQ, |
67c0496e | 981 | 0, 0, NULL, 0); |
c780e86d | 982 | rcu_read_unlock(); |
5f3ea37c ACM |
983 | } |
984 | } | |
985 | ||
38516ab5 | 986 | static void blk_add_trace_plug(void *ignore, struct request_queue *q) |
5f3ea37c | 987 | { |
c780e86d | 988 | struct blk_trace *bt; |
5f3ea37c | 989 | |
c780e86d JK |
990 | rcu_read_lock(); |
991 | bt = rcu_dereference(q->blk_trace); | |
5f3ea37c | 992 | if (bt) |
67c0496e | 993 | __blk_add_trace(bt, 0, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL, 0); |
c780e86d | 994 | rcu_read_unlock(); |
5f3ea37c ACM |
995 | } |
996 | ||
49cac01e JA |
997 | static void blk_add_trace_unplug(void *ignore, struct request_queue *q, |
998 | unsigned int depth, bool explicit) | |
5f3ea37c | 999 | { |
c780e86d | 1000 | struct blk_trace *bt; |
5f3ea37c | 1001 | |
c780e86d JK |
1002 | rcu_read_lock(); |
1003 | bt = rcu_dereference(q->blk_trace); | |
5f3ea37c | 1004 | if (bt) { |
94b5eb28 | 1005 | __be64 rpdu = cpu_to_be64(depth); |
49cac01e | 1006 | u32 what; |
5f3ea37c | 1007 | |
49cac01e JA |
1008 | if (explicit) |
1009 | what = BLK_TA_UNPLUG_IO; | |
1010 | else | |
1011 | what = BLK_TA_UNPLUG_TIMER; | |
1012 | ||
67c0496e | 1013 | __blk_add_trace(bt, 0, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu, 0); |
5f3ea37c | 1014 | } |
c780e86d | 1015 | rcu_read_unlock(); |
5f3ea37c ACM |
1016 | } |
1017 | ||
38516ab5 SR |
1018 | static void blk_add_trace_split(void *ignore, |
1019 | struct request_queue *q, struct bio *bio, | |
5f3ea37c ACM |
1020 | unsigned int pdu) |
1021 | { | |
c780e86d | 1022 | struct blk_trace *bt; |
5f3ea37c | 1023 | |
c780e86d JK |
1024 | rcu_read_lock(); |
1025 | bt = rcu_dereference(q->blk_trace); | |
5f3ea37c ACM |
1026 | if (bt) { |
1027 | __be64 rpdu = cpu_to_be64(pdu); | |
1028 | ||
4f024f37 | 1029 | __blk_add_trace(bt, bio->bi_iter.bi_sector, |
1eff9d32 | 1030 | bio->bi_iter.bi_size, bio_op(bio), bio->bi_opf, |
48bc3cd3 CK |
1031 | BLK_TA_SPLIT, |
1032 | blk_status_to_errno(bio->bi_status), | |
1033 | sizeof(rpdu), &rpdu, | |
1034 | blk_trace_bio_get_cgid(q, bio)); | |
5f3ea37c | 1035 | } |
c780e86d | 1036 | rcu_read_unlock(); |
5f3ea37c ACM |
1037 | } |
1038 | ||
1039 | /** | |
d07335e5 | 1040 | * blk_add_trace_bio_remap - Add a trace for a bio-remap operation |
546cf44a | 1041 | * @ignore: trace callback data parameter (not used) |
5f3ea37c ACM |
1042 | * @q: queue the io is for |
1043 | * @bio: the source bio | |
1044 | * @dev: target device | |
a42aaa3b | 1045 | * @from: source sector |
5f3ea37c ACM |
1046 | * |
1047 | * Description: | |
1048 | * Device mapper or raid target sometimes need to split a bio because | |
1049 | * it spans a stripe (or similar). Add a trace for that action. | |
1050 | * | |
1051 | **/ | |
d07335e5 MS |
1052 | static void blk_add_trace_bio_remap(void *ignore, |
1053 | struct request_queue *q, struct bio *bio, | |
1054 | dev_t dev, sector_t from) | |
5f3ea37c | 1055 | { |
c780e86d | 1056 | struct blk_trace *bt; |
5f3ea37c ACM |
1057 | struct blk_io_trace_remap r; |
1058 | ||
c780e86d JK |
1059 | rcu_read_lock(); |
1060 | bt = rcu_dereference(q->blk_trace); | |
1061 | if (likely(!bt)) { | |
1062 | rcu_read_unlock(); | |
5f3ea37c | 1063 | return; |
c780e86d | 1064 | } |
5f3ea37c | 1065 | |
a42aaa3b | 1066 | r.device_from = cpu_to_be32(dev); |
74d46992 | 1067 | r.device_to = cpu_to_be32(bio_dev(bio)); |
a42aaa3b | 1068 | r.sector_from = cpu_to_be64(from); |
5f3ea37c | 1069 | |
4f024f37 | 1070 | __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, |
48bc3cd3 CK |
1071 | bio_op(bio), bio->bi_opf, BLK_TA_REMAP, |
1072 | blk_status_to_errno(bio->bi_status), | |
ca1136c9 | 1073 | sizeof(r), &r, blk_trace_bio_get_cgid(q, bio)); |
c780e86d | 1074 | rcu_read_unlock(); |
5f3ea37c ACM |
1075 | } |
1076 | ||
b0da3f0d JN |
1077 | /** |
1078 | * blk_add_trace_rq_remap - Add a trace for a request-remap operation | |
546cf44a | 1079 | * @ignore: trace callback data parameter (not used) |
b0da3f0d JN |
1080 | * @q: queue the io is for |
1081 | * @rq: the source request | |
1082 | * @dev: target device | |
1083 | * @from: source sector | |
1084 | * | |
1085 | * Description: | |
1086 | * Device mapper remaps request to other devices. | |
1087 | * Add a trace for that action. | |
1088 | * | |
1089 | **/ | |
38516ab5 SR |
1090 | static void blk_add_trace_rq_remap(void *ignore, |
1091 | struct request_queue *q, | |
b0da3f0d JN |
1092 | struct request *rq, dev_t dev, |
1093 | sector_t from) | |
1094 | { | |
c780e86d | 1095 | struct blk_trace *bt; |
b0da3f0d JN |
1096 | struct blk_io_trace_remap r; |
1097 | ||
c780e86d JK |
1098 | rcu_read_lock(); |
1099 | bt = rcu_dereference(q->blk_trace); | |
1100 | if (likely(!bt)) { | |
1101 | rcu_read_unlock(); | |
b0da3f0d | 1102 | return; |
c780e86d | 1103 | } |
b0da3f0d JN |
1104 | |
1105 | r.device_from = cpu_to_be32(dev); | |
1106 | r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); | |
1107 | r.sector_from = cpu_to_be64(from); | |
1108 | ||
1109 | __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), | |
caf7df12 | 1110 | rq_data_dir(rq), 0, BLK_TA_REMAP, 0, |
ca1136c9 | 1111 | sizeof(r), &r, blk_trace_request_get_cgid(q, rq)); |
c780e86d | 1112 | rcu_read_unlock(); |
b0da3f0d JN |
1113 | } |
1114 | ||
5f3ea37c ACM |
1115 | /** |
1116 | * blk_add_driver_data - Add binary message with driver-specific data | |
1117 | * @q: queue the io is for | |
1118 | * @rq: io request | |
1119 | * @data: driver-specific data | |
1120 | * @len: length of driver-specific data | |
1121 | * | |
1122 | * Description: | |
1123 | * Some drivers might want to write driver-specific data per request. | |
1124 | * | |
1125 | **/ | |
1126 | void blk_add_driver_data(struct request_queue *q, | |
1127 | struct request *rq, | |
1128 | void *data, size_t len) | |
1129 | { | |
c780e86d | 1130 | struct blk_trace *bt; |
5f3ea37c | 1131 | |
c780e86d JK |
1132 | rcu_read_lock(); |
1133 | bt = rcu_dereference(q->blk_trace); | |
1134 | if (likely(!bt)) { | |
1135 | rcu_read_unlock(); | |
5f3ea37c | 1136 | return; |
c780e86d | 1137 | } |
5f3ea37c | 1138 | |
48b77ad6 | 1139 | __blk_add_trace(bt, blk_rq_trace_sector(rq), blk_rq_bytes(rq), 0, 0, |
ca1136c9 SL |
1140 | BLK_TA_DRV_DATA, 0, len, data, |
1141 | blk_trace_request_get_cgid(q, rq)); | |
c780e86d | 1142 | rcu_read_unlock(); |
5f3ea37c ACM |
1143 | } |
1144 | EXPORT_SYMBOL_GPL(blk_add_driver_data); | |
1145 | ||
3c289ba7 | 1146 | static void blk_register_tracepoints(void) |
5f3ea37c ACM |
1147 | { |
1148 | int ret; | |
1149 | ||
38516ab5 | 1150 | ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); |
5f3ea37c | 1151 | WARN_ON(ret); |
38516ab5 | 1152 | ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); |
5f3ea37c | 1153 | WARN_ON(ret); |
f3bdc62f JK |
1154 | ret = register_trace_block_rq_merge(blk_add_trace_rq_merge, NULL); |
1155 | WARN_ON(ret); | |
38516ab5 | 1156 | ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); |
5f3ea37c | 1157 | WARN_ON(ret); |
38516ab5 | 1158 | ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); |
5f3ea37c | 1159 | WARN_ON(ret); |
38516ab5 | 1160 | ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); |
5f3ea37c | 1161 | WARN_ON(ret); |
38516ab5 | 1162 | ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); |
5f3ea37c | 1163 | WARN_ON(ret); |
38516ab5 | 1164 | ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); |
5f3ea37c | 1165 | WARN_ON(ret); |
38516ab5 | 1166 | ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); |
5f3ea37c | 1167 | WARN_ON(ret); |
38516ab5 | 1168 | ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); |
5f3ea37c | 1169 | WARN_ON(ret); |
38516ab5 | 1170 | ret = register_trace_block_getrq(blk_add_trace_getrq, NULL); |
5f3ea37c | 1171 | WARN_ON(ret); |
38516ab5 | 1172 | ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); |
5f3ea37c | 1173 | WARN_ON(ret); |
38516ab5 | 1174 | ret = register_trace_block_plug(blk_add_trace_plug, NULL); |
5f3ea37c | 1175 | WARN_ON(ret); |
49cac01e | 1176 | ret = register_trace_block_unplug(blk_add_trace_unplug, NULL); |
5f3ea37c | 1177 | WARN_ON(ret); |
38516ab5 | 1178 | ret = register_trace_block_split(blk_add_trace_split, NULL); |
5f3ea37c | 1179 | WARN_ON(ret); |
d07335e5 | 1180 | ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); |
5f3ea37c | 1181 | WARN_ON(ret); |
38516ab5 | 1182 | ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); |
b0da3f0d | 1183 | WARN_ON(ret); |
5f3ea37c ACM |
1184 | } |
1185 | ||
1186 | static void blk_unregister_tracepoints(void) | |
1187 | { | |
38516ab5 | 1188 | unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); |
d07335e5 | 1189 | unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); |
38516ab5 | 1190 | unregister_trace_block_split(blk_add_trace_split, NULL); |
49cac01e | 1191 | unregister_trace_block_unplug(blk_add_trace_unplug, NULL); |
38516ab5 SR |
1192 | unregister_trace_block_plug(blk_add_trace_plug, NULL); |
1193 | unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); | |
1194 | unregister_trace_block_getrq(blk_add_trace_getrq, NULL); | |
1195 | unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); | |
1196 | unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); | |
1197 | unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); | |
1198 | unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); | |
1199 | unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); | |
1200 | unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); | |
1201 | unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); | |
f3bdc62f | 1202 | unregister_trace_block_rq_merge(blk_add_trace_rq_merge, NULL); |
38516ab5 SR |
1203 | unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); |
1204 | unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); | |
5f3ea37c ACM |
1205 | |
1206 | tracepoint_synchronize_unregister(); | |
1207 | } | |
c71a8961 ACM |
1208 | |
1209 | /* | |
1210 | * struct blk_io_tracer formatting routines | |
1211 | */ | |
1212 | ||
1213 | static void fill_rwbs(char *rwbs, const struct blk_io_trace *t) | |
1214 | { | |
157f9c00 | 1215 | int i = 0; |
65796348 | 1216 | int tc = t->action >> BLK_TC_SHIFT; |
157f9c00 | 1217 | |
ca1136c9 | 1218 | if ((t->action & ~__BLK_TN_CGROUP) == BLK_TN_MESSAGE) { |
18cea459 LZ |
1219 | rwbs[i++] = 'N'; |
1220 | goto out; | |
1221 | } | |
1222 | ||
c09c47ca NK |
1223 | if (tc & BLK_TC_FLUSH) |
1224 | rwbs[i++] = 'F'; | |
1225 | ||
65796348 | 1226 | if (tc & BLK_TC_DISCARD) |
157f9c00 | 1227 | rwbs[i++] = 'D'; |
65796348 | 1228 | else if (tc & BLK_TC_WRITE) |
157f9c00 ACM |
1229 | rwbs[i++] = 'W'; |
1230 | else if (t->bytes) | |
1231 | rwbs[i++] = 'R'; | |
1232 | else | |
1233 | rwbs[i++] = 'N'; | |
1234 | ||
c09c47ca NK |
1235 | if (tc & BLK_TC_FUA) |
1236 | rwbs[i++] = 'F'; | |
65796348 | 1237 | if (tc & BLK_TC_AHEAD) |
157f9c00 | 1238 | rwbs[i++] = 'A'; |
65796348 | 1239 | if (tc & BLK_TC_SYNC) |
157f9c00 | 1240 | rwbs[i++] = 'S'; |
65796348 | 1241 | if (tc & BLK_TC_META) |
157f9c00 | 1242 | rwbs[i++] = 'M'; |
18cea459 | 1243 | out: |
157f9c00 | 1244 | rwbs[i] = '\0'; |
c71a8961 ACM |
1245 | } |
1246 | ||
1247 | static inline | |
1248 | const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) | |
1249 | { | |
1250 | return (const struct blk_io_trace *)ent; | |
1251 | } | |
1252 | ||
ca1136c9 SL |
1253 | static inline const void *pdu_start(const struct trace_entry *ent, bool has_cg) |
1254 | { | |
67c0496e | 1255 | return (void *)(te_blk_io_trace(ent) + 1) + (has_cg ? sizeof(u64) : 0); |
ca1136c9 SL |
1256 | } |
1257 | ||
67c0496e | 1258 | static inline u64 t_cgid(const struct trace_entry *ent) |
c71a8961 | 1259 | { |
67c0496e | 1260 | return *(u64 *)(te_blk_io_trace(ent) + 1); |
ca1136c9 SL |
1261 | } |
1262 | ||
1263 | static inline int pdu_real_len(const struct trace_entry *ent, bool has_cg) | |
1264 | { | |
67c0496e | 1265 | return te_blk_io_trace(ent)->pdu_len - (has_cg ? sizeof(u64) : 0); |
c71a8961 ACM |
1266 | } |
1267 | ||
66de7792 LZ |
1268 | static inline u32 t_action(const struct trace_entry *ent) |
1269 | { | |
1270 | return te_blk_io_trace(ent)->action; | |
1271 | } | |
1272 | ||
1273 | static inline u32 t_bytes(const struct trace_entry *ent) | |
1274 | { | |
1275 | return te_blk_io_trace(ent)->bytes; | |
1276 | } | |
1277 | ||
c71a8961 ACM |
1278 | static inline u32 t_sec(const struct trace_entry *ent) |
1279 | { | |
1280 | return te_blk_io_trace(ent)->bytes >> 9; | |
1281 | } | |
1282 | ||
1283 | static inline unsigned long long t_sector(const struct trace_entry *ent) | |
1284 | { | |
1285 | return te_blk_io_trace(ent)->sector; | |
1286 | } | |
1287 | ||
1288 | static inline __u16 t_error(const struct trace_entry *ent) | |
1289 | { | |
e0dc81be | 1290 | return te_blk_io_trace(ent)->error; |
c71a8961 ACM |
1291 | } |
1292 | ||
ca1136c9 | 1293 | static __u64 get_pdu_int(const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1294 | { |
71df3fd8 | 1295 | const __be64 *val = pdu_start(ent, has_cg); |
c71a8961 ACM |
1296 | return be64_to_cpu(*val); |
1297 | } | |
1298 | ||
ca1136c9 SL |
1299 | typedef void (blk_log_action_t) (struct trace_iterator *iter, const char *act, |
1300 | bool has_cg); | |
b6a4b0c3 | 1301 | |
ca1136c9 SL |
1302 | static void blk_log_action_classic(struct trace_iterator *iter, const char *act, |
1303 | bool has_cg) | |
c71a8961 | 1304 | { |
c09c47ca | 1305 | char rwbs[RWBS_LEN]; |
35ac51bf LZ |
1306 | unsigned long long ts = iter->ts; |
1307 | unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); | |
c71a8961 | 1308 | unsigned secs = (unsigned long)ts; |
b6a4b0c3 | 1309 | const struct blk_io_trace *t = te_blk_io_trace(iter->ent); |
c71a8961 ACM |
1310 | |
1311 | fill_rwbs(rwbs, t); | |
1312 | ||
f4a1d08c SRRH |
1313 | trace_seq_printf(&iter->seq, |
1314 | "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", | |
1315 | MAJOR(t->device), MINOR(t->device), iter->cpu, | |
1316 | secs, nsec_rem, iter->ent->pid, act, rwbs); | |
c71a8961 ACM |
1317 | } |
1318 | ||
ca1136c9 SL |
1319 | static void blk_log_action(struct trace_iterator *iter, const char *act, |
1320 | bool has_cg) | |
c71a8961 | 1321 | { |
c09c47ca | 1322 | char rwbs[RWBS_LEN]; |
b6a4b0c3 LZ |
1323 | const struct blk_io_trace *t = te_blk_io_trace(iter->ent); |
1324 | ||
c71a8961 | 1325 | fill_rwbs(rwbs, t); |
ca1136c9 | 1326 | if (has_cg) { |
67c0496e | 1327 | u64 id = t_cgid(iter->ent); |
ca1136c9 | 1328 | |
69fd5c39 SL |
1329 | if (blk_tracer_flags.val & TRACE_BLK_OPT_CGNAME) { |
1330 | char blkcg_name_buf[NAME_MAX + 1] = "<...>"; | |
1331 | ||
1332 | cgroup_path_from_kernfs_id(id, blkcg_name_buf, | |
1333 | sizeof(blkcg_name_buf)); | |
1334 | trace_seq_printf(&iter->seq, "%3d,%-3d %s %2s %3s ", | |
1335 | MAJOR(t->device), MINOR(t->device), | |
1336 | blkcg_name_buf, act, rwbs); | |
40430452 TH |
1337 | } else { |
1338 | /* | |
1339 | * The cgid portion used to be "INO,GEN". Userland | |
1340 | * builds a FILEID_INO32_GEN fid out of them and | |
1341 | * opens the cgroup using open_by_handle_at(2). | |
1342 | * While 32bit ino setups are still the same, 64bit | |
1343 | * ones now use the 64bit ino as the whole ID and | |
1344 | * no longer use generation. | |
1345 | * | |
1346 | * Regarldess of the content, always output | |
1347 | * "LOW32,HIGH32" so that FILEID_INO32_GEN fid can | |
1348 | * be mapped back to @id on both 64 and 32bit ino | |
1349 | * setups. See __kernfs_fh_to_dentry(). | |
1350 | */ | |
69fd5c39 | 1351 | trace_seq_printf(&iter->seq, |
40430452 | 1352 | "%3d,%-3d %llx,%-llx %2s %3s ", |
ca1136c9 | 1353 | MAJOR(t->device), MINOR(t->device), |
40430452 TH |
1354 | id & U32_MAX, id >> 32, act, rwbs); |
1355 | } | |
ca1136c9 SL |
1356 | } else |
1357 | trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", | |
1358 | MAJOR(t->device), MINOR(t->device), act, rwbs); | |
c71a8961 ACM |
1359 | } |
1360 | ||
ca1136c9 SL |
1361 | static void blk_log_dump_pdu(struct trace_seq *s, |
1362 | const struct trace_entry *ent, bool has_cg) | |
66de7792 | 1363 | { |
04986257 | 1364 | const unsigned char *pdu_buf; |
66de7792 | 1365 | int pdu_len; |
f4a1d08c | 1366 | int i, end; |
66de7792 | 1367 | |
ca1136c9 SL |
1368 | pdu_buf = pdu_start(ent, has_cg); |
1369 | pdu_len = pdu_real_len(ent, has_cg); | |
66de7792 LZ |
1370 | |
1371 | if (!pdu_len) | |
f4a1d08c | 1372 | return; |
66de7792 LZ |
1373 | |
1374 | /* find the last zero that needs to be printed */ | |
1375 | for (end = pdu_len - 1; end >= 0; end--) | |
1376 | if (pdu_buf[end]) | |
1377 | break; | |
1378 | end++; | |
1379 | ||
f4a1d08c | 1380 | trace_seq_putc(s, '('); |
66de7792 LZ |
1381 | |
1382 | for (i = 0; i < pdu_len; i++) { | |
1383 | ||
f4a1d08c SRRH |
1384 | trace_seq_printf(s, "%s%02x", |
1385 | i == 0 ? "" : " ", pdu_buf[i]); | |
66de7792 LZ |
1386 | |
1387 | /* | |
1388 | * stop when the rest is just zeroes and indicate so | |
1389 | * with a ".." appended | |
1390 | */ | |
f4a1d08c SRRH |
1391 | if (i == end && end != pdu_len - 1) { |
1392 | trace_seq_puts(s, " ..) "); | |
1393 | return; | |
1394 | } | |
66de7792 LZ |
1395 | } |
1396 | ||
f4a1d08c | 1397 | trace_seq_puts(s, ") "); |
66de7792 LZ |
1398 | } |
1399 | ||
ca1136c9 | 1400 | static void blk_log_generic(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1401 | { |
4ca53085 SR |
1402 | char cmd[TASK_COMM_LEN]; |
1403 | ||
1404 | trace_find_cmdline(ent->pid, cmd); | |
c71a8961 | 1405 | |
66de7792 | 1406 | if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { |
f4a1d08c | 1407 | trace_seq_printf(s, "%u ", t_bytes(ent)); |
ca1136c9 | 1408 | blk_log_dump_pdu(s, ent, has_cg); |
f4a1d08c | 1409 | trace_seq_printf(s, "[%s]\n", cmd); |
66de7792 LZ |
1410 | } else { |
1411 | if (t_sec(ent)) | |
f4a1d08c | 1412 | trace_seq_printf(s, "%llu + %u [%s]\n", |
66de7792 | 1413 | t_sector(ent), t_sec(ent), cmd); |
f4a1d08c SRRH |
1414 | else |
1415 | trace_seq_printf(s, "[%s]\n", cmd); | |
66de7792 | 1416 | } |
c71a8961 ACM |
1417 | } |
1418 | ||
f4a1d08c | 1419 | static void blk_log_with_error(struct trace_seq *s, |
ca1136c9 | 1420 | const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1421 | { |
66de7792 | 1422 | if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { |
ca1136c9 | 1423 | blk_log_dump_pdu(s, ent, has_cg); |
f4a1d08c | 1424 | trace_seq_printf(s, "[%d]\n", t_error(ent)); |
66de7792 LZ |
1425 | } else { |
1426 | if (t_sec(ent)) | |
f4a1d08c SRRH |
1427 | trace_seq_printf(s, "%llu + %u [%d]\n", |
1428 | t_sector(ent), | |
1429 | t_sec(ent), t_error(ent)); | |
1430 | else | |
1431 | trace_seq_printf(s, "%llu [%d]\n", | |
1432 | t_sector(ent), t_error(ent)); | |
66de7792 | 1433 | } |
c71a8961 ACM |
1434 | } |
1435 | ||
ca1136c9 | 1436 | static void blk_log_remap(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1437 | { |
5aec598c | 1438 | const struct blk_io_trace_remap *__r = pdu_start(ent, has_cg); |
c71a8961 | 1439 | |
f4a1d08c SRRH |
1440 | trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", |
1441 | t_sector(ent), t_sec(ent), | |
5aec598c CK |
1442 | MAJOR(be32_to_cpu(__r->device_from)), |
1443 | MINOR(be32_to_cpu(__r->device_from)), | |
1444 | be64_to_cpu(__r->sector_from)); | |
c71a8961 ACM |
1445 | } |
1446 | ||
ca1136c9 | 1447 | static void blk_log_plug(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1448 | { |
4ca53085 SR |
1449 | char cmd[TASK_COMM_LEN]; |
1450 | ||
1451 | trace_find_cmdline(ent->pid, cmd); | |
1452 | ||
f4a1d08c | 1453 | trace_seq_printf(s, "[%s]\n", cmd); |
c71a8961 ACM |
1454 | } |
1455 | ||
ca1136c9 | 1456 | static void blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1457 | { |
4ca53085 SR |
1458 | char cmd[TASK_COMM_LEN]; |
1459 | ||
1460 | trace_find_cmdline(ent->pid, cmd); | |
1461 | ||
ca1136c9 | 1462 | trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent, has_cg)); |
c71a8961 ACM |
1463 | } |
1464 | ||
ca1136c9 | 1465 | static void blk_log_split(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1466 | { |
4ca53085 SR |
1467 | char cmd[TASK_COMM_LEN]; |
1468 | ||
1469 | trace_find_cmdline(ent->pid, cmd); | |
1470 | ||
f4a1d08c | 1471 | trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), |
ca1136c9 | 1472 | get_pdu_int(ent, has_cg), cmd); |
c71a8961 ACM |
1473 | } |
1474 | ||
ca1136c9 SL |
1475 | static void blk_log_msg(struct trace_seq *s, const struct trace_entry *ent, |
1476 | bool has_cg) | |
18cea459 | 1477 | { |
18cea459 | 1478 | |
ca1136c9 SL |
1479 | trace_seq_putmem(s, pdu_start(ent, has_cg), |
1480 | pdu_real_len(ent, has_cg)); | |
f4a1d08c | 1481 | trace_seq_putc(s, '\n'); |
18cea459 LZ |
1482 | } |
1483 | ||
c71a8961 ACM |
1484 | /* |
1485 | * struct tracer operations | |
1486 | */ | |
1487 | ||
1488 | static void blk_tracer_print_header(struct seq_file *m) | |
1489 | { | |
1490 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) | |
1491 | return; | |
1492 | seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" | |
1493 | "# | | | | | |\n"); | |
1494 | } | |
1495 | ||
1496 | static void blk_tracer_start(struct trace_array *tr) | |
1497 | { | |
ad5dd549 | 1498 | blk_tracer_enabled = true; |
c71a8961 ACM |
1499 | } |
1500 | ||
1501 | static int blk_tracer_init(struct trace_array *tr) | |
1502 | { | |
1503 | blk_tr = tr; | |
1504 | blk_tracer_start(tr); | |
c71a8961 ACM |
1505 | return 0; |
1506 | } | |
1507 | ||
1508 | static void blk_tracer_stop(struct trace_array *tr) | |
1509 | { | |
ad5dd549 | 1510 | blk_tracer_enabled = false; |
c71a8961 ACM |
1511 | } |
1512 | ||
1513 | static void blk_tracer_reset(struct trace_array *tr) | |
1514 | { | |
c71a8961 ACM |
1515 | blk_tracer_stop(tr); |
1516 | } | |
1517 | ||
e4955c99 | 1518 | static const struct { |
c71a8961 | 1519 | const char *act[2]; |
ca1136c9 SL |
1520 | void (*print)(struct trace_seq *s, const struct trace_entry *ent, |
1521 | bool has_cg); | |
e4955c99 | 1522 | } what2act[] = { |
ef18012b | 1523 | [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, |
c71a8961 ACM |
1524 | [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, |
1525 | [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, | |
1526 | [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, | |
1527 | [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, | |
1528 | [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, | |
1529 | [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, | |
1530 | [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, | |
1531 | [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, | |
1532 | [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, | |
49cac01e | 1533 | [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, |
c71a8961 ACM |
1534 | [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, |
1535 | [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, | |
1536 | [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, | |
1537 | [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, | |
1538 | }; | |
1539 | ||
b6a4b0c3 LZ |
1540 | static enum print_line_t print_one_line(struct trace_iterator *iter, |
1541 | bool classic) | |
c71a8961 | 1542 | { |
983f938a | 1543 | struct trace_array *tr = iter->tr; |
2c9b238e | 1544 | struct trace_seq *s = &iter->seq; |
b6a4b0c3 LZ |
1545 | const struct blk_io_trace *t; |
1546 | u16 what; | |
b6a4b0c3 LZ |
1547 | bool long_act; |
1548 | blk_log_action_t *log_action; | |
ca1136c9 | 1549 | bool has_cg; |
c71a8961 | 1550 | |
b6a4b0c3 | 1551 | t = te_blk_io_trace(iter->ent); |
ca1136c9 | 1552 | what = (t->action & ((1 << BLK_TC_SHIFT) - 1)) & ~__BLK_TA_CGROUP; |
983f938a | 1553 | long_act = !!(tr->trace_flags & TRACE_ITER_VERBOSE); |
b6a4b0c3 | 1554 | log_action = classic ? &blk_log_action_classic : &blk_log_action; |
ca1136c9 | 1555 | has_cg = t->action & __BLK_TA_CGROUP; |
08a06b83 | 1556 | |
ca1136c9 SL |
1557 | if ((t->action & ~__BLK_TN_CGROUP) == BLK_TN_MESSAGE) { |
1558 | log_action(iter, long_act ? "message" : "m", has_cg); | |
1559 | blk_log_msg(s, iter->ent, has_cg); | |
b7d7641e | 1560 | return trace_handle_return(s); |
18cea459 LZ |
1561 | } |
1562 | ||
eb08f8eb | 1563 | if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) |
f4a1d08c | 1564 | trace_seq_printf(s, "Unknown action %x\n", what); |
c71a8961 | 1565 | else { |
ca1136c9 SL |
1566 | log_action(iter, what2act[what].act[long_act], has_cg); |
1567 | what2act[what].print(s, iter->ent, has_cg); | |
c71a8961 | 1568 | } |
f4a1d08c SRRH |
1569 | |
1570 | return trace_handle_return(s); | |
c71a8961 ACM |
1571 | } |
1572 | ||
b6a4b0c3 | 1573 | static enum print_line_t blk_trace_event_print(struct trace_iterator *iter, |
a9a57763 | 1574 | int flags, struct trace_event *event) |
b6a4b0c3 | 1575 | { |
b6a4b0c3 LZ |
1576 | return print_one_line(iter, false); |
1577 | } | |
1578 | ||
f4a1d08c | 1579 | static void blk_trace_synthesize_old_trace(struct trace_iterator *iter) |
08a06b83 ACM |
1580 | { |
1581 | struct trace_seq *s = &iter->seq; | |
1582 | struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; | |
1583 | const int offset = offsetof(struct blk_io_trace, sector); | |
1584 | struct blk_io_trace old = { | |
1585 | .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, | |
6c051ce0 | 1586 | .time = iter->ts, |
08a06b83 ACM |
1587 | }; |
1588 | ||
f4a1d08c SRRH |
1589 | trace_seq_putmem(s, &old, offset); |
1590 | trace_seq_putmem(s, &t->sector, | |
1591 | sizeof(old) - offset + t->pdu_len); | |
08a06b83 ACM |
1592 | } |
1593 | ||
ae7462b4 | 1594 | static enum print_line_t |
a9a57763 SR |
1595 | blk_trace_event_print_binary(struct trace_iterator *iter, int flags, |
1596 | struct trace_event *event) | |
08a06b83 | 1597 | { |
f4a1d08c SRRH |
1598 | blk_trace_synthesize_old_trace(iter); |
1599 | ||
1600 | return trace_handle_return(&iter->seq); | |
08a06b83 ACM |
1601 | } |
1602 | ||
c71a8961 ACM |
1603 | static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) |
1604 | { | |
c71a8961 ACM |
1605 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) |
1606 | return TRACE_TYPE_UNHANDLED; | |
1607 | ||
b6a4b0c3 | 1608 | return print_one_line(iter, true); |
c71a8961 ACM |
1609 | } |
1610 | ||
8c1a49ae SRRH |
1611 | static int |
1612 | blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) | |
f3948f88 LZ |
1613 | { |
1614 | /* don't output context-info for blk_classic output */ | |
1615 | if (bit == TRACE_BLK_OPT_CLASSIC) { | |
1616 | if (set) | |
983f938a | 1617 | tr->trace_flags &= ~TRACE_ITER_CONTEXT_INFO; |
f3948f88 | 1618 | else |
983f938a | 1619 | tr->trace_flags |= TRACE_ITER_CONTEXT_INFO; |
f3948f88 LZ |
1620 | } |
1621 | return 0; | |
1622 | } | |
1623 | ||
c71a8961 ACM |
1624 | static struct tracer blk_tracer __read_mostly = { |
1625 | .name = "blk", | |
1626 | .init = blk_tracer_init, | |
1627 | .reset = blk_tracer_reset, | |
1628 | .start = blk_tracer_start, | |
1629 | .stop = blk_tracer_stop, | |
1630 | .print_header = blk_tracer_print_header, | |
1631 | .print_line = blk_tracer_print_line, | |
1632 | .flags = &blk_tracer_flags, | |
f3948f88 | 1633 | .set_flag = blk_tracer_set_flag, |
c71a8961 ACM |
1634 | }; |
1635 | ||
a9a57763 | 1636 | static struct trace_event_functions trace_blk_event_funcs = { |
c71a8961 | 1637 | .trace = blk_trace_event_print, |
08a06b83 | 1638 | .binary = blk_trace_event_print_binary, |
c71a8961 ACM |
1639 | }; |
1640 | ||
a9a57763 SR |
1641 | static struct trace_event trace_blk_event = { |
1642 | .type = TRACE_BLK, | |
1643 | .funcs = &trace_blk_event_funcs, | |
1644 | }; | |
1645 | ||
c71a8961 ACM |
1646 | static int __init init_blk_tracer(void) |
1647 | { | |
9023c930 | 1648 | if (!register_trace_event(&trace_blk_event)) { |
a395d6a7 | 1649 | pr_warn("Warning: could not register block events\n"); |
c71a8961 ACM |
1650 | return 1; |
1651 | } | |
1652 | ||
1653 | if (register_tracer(&blk_tracer) != 0) { | |
a395d6a7 | 1654 | pr_warn("Warning: could not register the block tracer\n"); |
9023c930 | 1655 | unregister_trace_event(&trace_blk_event); |
c71a8961 ACM |
1656 | return 1; |
1657 | } | |
1658 | ||
1659 | return 0; | |
1660 | } | |
1661 | ||
1662 | device_initcall(init_blk_tracer); | |
1663 | ||
1664 | static int blk_trace_remove_queue(struct request_queue *q) | |
1665 | { | |
1666 | struct blk_trace *bt; | |
1667 | ||
c3dbe541 | 1668 | bt = rcu_replace_pointer(q->blk_trace, NULL, |
85e0cbbb | 1669 | lockdep_is_held(&q->debugfs_mutex)); |
c71a8961 ACM |
1670 | if (bt == NULL) |
1671 | return -EINVAL; | |
1672 | ||
a6da0024 | 1673 | put_probe_ref(); |
c780e86d | 1674 | synchronize_rcu(); |
ad5dd549 | 1675 | blk_trace_free(bt); |
c71a8961 ACM |
1676 | return 0; |
1677 | } | |
1678 | ||
1679 | /* | |
1680 | * Setup everything required to start tracing | |
1681 | */ | |
9908c309 LZ |
1682 | static int blk_trace_setup_queue(struct request_queue *q, |
1683 | struct block_device *bdev) | |
c71a8961 | 1684 | { |
cdea01b2 | 1685 | struct blk_trace *bt = NULL; |
18cea459 | 1686 | int ret = -ENOMEM; |
c71a8961 | 1687 | |
c71a8961 ACM |
1688 | bt = kzalloc(sizeof(*bt), GFP_KERNEL); |
1689 | if (!bt) | |
15152e44 | 1690 | return -ENOMEM; |
c71a8961 | 1691 | |
18cea459 LZ |
1692 | bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); |
1693 | if (!bt->msg_data) | |
1694 | goto free_bt; | |
1695 | ||
9908c309 | 1696 | bt->dev = bdev->bd_dev; |
c71a8961 | 1697 | bt->act_mask = (u16)-1; |
9908c309 LZ |
1698 | |
1699 | blk_trace_setup_lba(bt, bdev); | |
c71a8961 | 1700 | |
c3dbe541 | 1701 | rcu_assign_pointer(q->blk_trace, bt); |
a6da0024 | 1702 | get_probe_ref(); |
c71a8961 | 1703 | return 0; |
18cea459 LZ |
1704 | |
1705 | free_bt: | |
1706 | blk_trace_free(bt); | |
1707 | return ret; | |
c71a8961 ACM |
1708 | } |
1709 | ||
1710 | /* | |
1711 | * sysfs interface to enable and configure tracing | |
1712 | */ | |
1713 | ||
c71a8961 ACM |
1714 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, |
1715 | struct device_attribute *attr, | |
1716 | char *buf); | |
1717 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | |
1718 | struct device_attribute *attr, | |
1719 | const char *buf, size_t count); | |
1720 | #define BLK_TRACE_DEVICE_ATTR(_name) \ | |
1721 | DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ | |
1722 | sysfs_blk_trace_attr_show, \ | |
1723 | sysfs_blk_trace_attr_store) | |
1724 | ||
cd649b8b | 1725 | static BLK_TRACE_DEVICE_ATTR(enable); |
c71a8961 ACM |
1726 | static BLK_TRACE_DEVICE_ATTR(act_mask); |
1727 | static BLK_TRACE_DEVICE_ATTR(pid); | |
1728 | static BLK_TRACE_DEVICE_ATTR(start_lba); | |
1729 | static BLK_TRACE_DEVICE_ATTR(end_lba); | |
1730 | ||
1731 | static struct attribute *blk_trace_attrs[] = { | |
1732 | &dev_attr_enable.attr, | |
1733 | &dev_attr_act_mask.attr, | |
1734 | &dev_attr_pid.attr, | |
1735 | &dev_attr_start_lba.attr, | |
1736 | &dev_attr_end_lba.attr, | |
1737 | NULL | |
1738 | }; | |
1739 | ||
1740 | struct attribute_group blk_trace_attr_group = { | |
1741 | .name = "trace", | |
1742 | .attrs = blk_trace_attrs, | |
1743 | }; | |
1744 | ||
09341997 LZ |
1745 | static const struct { |
1746 | int mask; | |
1747 | const char *str; | |
1748 | } mask_maps[] = { | |
1749 | { BLK_TC_READ, "read" }, | |
1750 | { BLK_TC_WRITE, "write" }, | |
c09c47ca | 1751 | { BLK_TC_FLUSH, "flush" }, |
09341997 LZ |
1752 | { BLK_TC_SYNC, "sync" }, |
1753 | { BLK_TC_QUEUE, "queue" }, | |
1754 | { BLK_TC_REQUEUE, "requeue" }, | |
1755 | { BLK_TC_ISSUE, "issue" }, | |
1756 | { BLK_TC_COMPLETE, "complete" }, | |
1757 | { BLK_TC_FS, "fs" }, | |
1758 | { BLK_TC_PC, "pc" }, | |
8d1547e0 | 1759 | { BLK_TC_NOTIFY, "notify" }, |
09341997 LZ |
1760 | { BLK_TC_AHEAD, "ahead" }, |
1761 | { BLK_TC_META, "meta" }, | |
1762 | { BLK_TC_DISCARD, "discard" }, | |
1763 | { BLK_TC_DRV_DATA, "drv_data" }, | |
c09c47ca | 1764 | { BLK_TC_FUA, "fua" }, |
09341997 LZ |
1765 | }; |
1766 | ||
1767 | static int blk_trace_str2mask(const char *str) | |
c71a8961 | 1768 | { |
09341997 | 1769 | int i; |
c71a8961 | 1770 | int mask = 0; |
9eb85125 | 1771 | char *buf, *s, *token; |
c71a8961 | 1772 | |
9eb85125 LZ |
1773 | buf = kstrdup(str, GFP_KERNEL); |
1774 | if (buf == NULL) | |
c71a8961 | 1775 | return -ENOMEM; |
9eb85125 | 1776 | s = strstrip(buf); |
c71a8961 ACM |
1777 | |
1778 | while (1) { | |
09341997 LZ |
1779 | token = strsep(&s, ","); |
1780 | if (token == NULL) | |
c71a8961 ACM |
1781 | break; |
1782 | ||
09341997 LZ |
1783 | if (*token == '\0') |
1784 | continue; | |
1785 | ||
1786 | for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { | |
1787 | if (strcasecmp(token, mask_maps[i].str) == 0) { | |
1788 | mask |= mask_maps[i].mask; | |
1789 | break; | |
1790 | } | |
1791 | } | |
1792 | if (i == ARRAY_SIZE(mask_maps)) { | |
1793 | mask = -EINVAL; | |
1794 | break; | |
1795 | } | |
c71a8961 | 1796 | } |
9eb85125 | 1797 | kfree(buf); |
c71a8961 ACM |
1798 | |
1799 | return mask; | |
1800 | } | |
1801 | ||
09341997 LZ |
1802 | static ssize_t blk_trace_mask2str(char *buf, int mask) |
1803 | { | |
1804 | int i; | |
1805 | char *p = buf; | |
1806 | ||
1807 | for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { | |
1808 | if (mask & mask_maps[i].mask) { | |
1809 | p += sprintf(p, "%s%s", | |
1810 | (p == buf) ? "" : ",", mask_maps[i].str); | |
1811 | } | |
1812 | } | |
1813 | *p++ = '\n'; | |
1814 | ||
1815 | return p - buf; | |
1816 | } | |
1817 | ||
b125130b LZ |
1818 | static struct request_queue *blk_trace_get_queue(struct block_device *bdev) |
1819 | { | |
1820 | if (bdev->bd_disk == NULL) | |
1821 | return NULL; | |
1822 | ||
1823 | return bdev_get_queue(bdev); | |
1824 | } | |
1825 | ||
c71a8961 ACM |
1826 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, |
1827 | struct device_attribute *attr, | |
1828 | char *buf) | |
1829 | { | |
10ed1666 | 1830 | struct block_device *bdev = bdget_part(dev_to_part(dev)); |
c71a8961 | 1831 | struct request_queue *q; |
c780e86d | 1832 | struct blk_trace *bt; |
c71a8961 ACM |
1833 | ssize_t ret = -ENXIO; |
1834 | ||
c71a8961 | 1835 | if (bdev == NULL) |
01b284f9 | 1836 | goto out; |
c71a8961 | 1837 | |
b125130b | 1838 | q = blk_trace_get_queue(bdev); |
c71a8961 ACM |
1839 | if (q == NULL) |
1840 | goto out_bdput; | |
b125130b | 1841 | |
85e0cbbb | 1842 | mutex_lock(&q->debugfs_mutex); |
cd649b8b | 1843 | |
c780e86d | 1844 | bt = rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 1845 | lockdep_is_held(&q->debugfs_mutex)); |
cd649b8b | 1846 | if (attr == &dev_attr_enable) { |
c780e86d | 1847 | ret = sprintf(buf, "%u\n", !!bt); |
cd649b8b LZ |
1848 | goto out_unlock_bdev; |
1849 | } | |
1850 | ||
c780e86d | 1851 | if (bt == NULL) |
c71a8961 ACM |
1852 | ret = sprintf(buf, "disabled\n"); |
1853 | else if (attr == &dev_attr_act_mask) | |
c780e86d | 1854 | ret = blk_trace_mask2str(buf, bt->act_mask); |
c71a8961 | 1855 | else if (attr == &dev_attr_pid) |
c780e86d | 1856 | ret = sprintf(buf, "%u\n", bt->pid); |
c71a8961 | 1857 | else if (attr == &dev_attr_start_lba) |
c780e86d | 1858 | ret = sprintf(buf, "%llu\n", bt->start_lba); |
c71a8961 | 1859 | else if (attr == &dev_attr_end_lba) |
c780e86d | 1860 | ret = sprintf(buf, "%llu\n", bt->end_lba); |
cd649b8b LZ |
1861 | |
1862 | out_unlock_bdev: | |
85e0cbbb | 1863 | mutex_unlock(&q->debugfs_mutex); |
c71a8961 ACM |
1864 | out_bdput: |
1865 | bdput(bdev); | |
01b284f9 | 1866 | out: |
c71a8961 ACM |
1867 | return ret; |
1868 | } | |
1869 | ||
1870 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | |
1871 | struct device_attribute *attr, | |
1872 | const char *buf, size_t count) | |
1873 | { | |
1874 | struct block_device *bdev; | |
1875 | struct request_queue *q; | |
c780e86d | 1876 | struct blk_trace *bt; |
c71a8961 | 1877 | u64 value; |
09341997 | 1878 | ssize_t ret = -EINVAL; |
c71a8961 ACM |
1879 | |
1880 | if (count == 0) | |
1881 | goto out; | |
1882 | ||
1883 | if (attr == &dev_attr_act_mask) { | |
5f339453 | 1884 | if (kstrtoull(buf, 0, &value)) { |
c71a8961 | 1885 | /* Assume it is a list of trace category names */ |
09341997 LZ |
1886 | ret = blk_trace_str2mask(buf); |
1887 | if (ret < 0) | |
c71a8961 | 1888 | goto out; |
09341997 | 1889 | value = ret; |
c71a8961 | 1890 | } |
5f339453 | 1891 | } else if (kstrtoull(buf, 0, &value)) |
c71a8961 ACM |
1892 | goto out; |
1893 | ||
09341997 | 1894 | ret = -ENXIO; |
10ed1666 | 1895 | bdev = bdget_part(dev_to_part(dev)); |
c71a8961 | 1896 | if (bdev == NULL) |
01b284f9 | 1897 | goto out; |
c71a8961 | 1898 | |
b125130b | 1899 | q = blk_trace_get_queue(bdev); |
c71a8961 ACM |
1900 | if (q == NULL) |
1901 | goto out_bdput; | |
1902 | ||
85e0cbbb | 1903 | mutex_lock(&q->debugfs_mutex); |
cd649b8b | 1904 | |
c780e86d | 1905 | bt = rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 1906 | lockdep_is_held(&q->debugfs_mutex)); |
cd649b8b | 1907 | if (attr == &dev_attr_enable) { |
c780e86d | 1908 | if (!!value == !!bt) { |
757d9140 SRV |
1909 | ret = 0; |
1910 | goto out_unlock_bdev; | |
1911 | } | |
cd649b8b | 1912 | if (value) |
9908c309 | 1913 | ret = blk_trace_setup_queue(q, bdev); |
cd649b8b LZ |
1914 | else |
1915 | ret = blk_trace_remove_queue(q); | |
1916 | goto out_unlock_bdev; | |
1917 | } | |
1918 | ||
c71a8961 | 1919 | ret = 0; |
153031a3 | 1920 | if (bt == NULL) { |
9908c309 | 1921 | ret = blk_trace_setup_queue(q, bdev); |
153031a3 | 1922 | bt = rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 1923 | lockdep_is_held(&q->debugfs_mutex)); |
153031a3 | 1924 | } |
c71a8961 ACM |
1925 | |
1926 | if (ret == 0) { | |
1927 | if (attr == &dev_attr_act_mask) | |
c780e86d | 1928 | bt->act_mask = value; |
c71a8961 | 1929 | else if (attr == &dev_attr_pid) |
c780e86d | 1930 | bt->pid = value; |
c71a8961 | 1931 | else if (attr == &dev_attr_start_lba) |
c780e86d | 1932 | bt->start_lba = value; |
c71a8961 | 1933 | else if (attr == &dev_attr_end_lba) |
c780e86d | 1934 | bt->end_lba = value; |
c71a8961 | 1935 | } |
cd649b8b LZ |
1936 | |
1937 | out_unlock_bdev: | |
85e0cbbb | 1938 | mutex_unlock(&q->debugfs_mutex); |
c71a8961 ACM |
1939 | out_bdput: |
1940 | bdput(bdev); | |
c71a8961 | 1941 | out: |
cd649b8b | 1942 | return ret ? ret : count; |
c71a8961 | 1943 | } |
cd649b8b | 1944 | |
1d54ad6d LZ |
1945 | int blk_trace_init_sysfs(struct device *dev) |
1946 | { | |
1947 | return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); | |
1948 | } | |
1949 | ||
48c0d4d4 ZK |
1950 | void blk_trace_remove_sysfs(struct device *dev) |
1951 | { | |
1952 | sysfs_remove_group(&dev->kobj, &blk_trace_attr_group); | |
1953 | } | |
1954 | ||
55782138 LZ |
1955 | #endif /* CONFIG_BLK_DEV_IO_TRACE */ |
1956 | ||
1957 | #ifdef CONFIG_EVENT_TRACING | |
1958 | ||
ef295ecf | 1959 | void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes) |
55782138 LZ |
1960 | { |
1961 | int i = 0; | |
1962 | ||
ef295ecf | 1963 | if (op & REQ_PREFLUSH) |
c09c47ca NK |
1964 | rwbs[i++] = 'F'; |
1965 | ||
ef295ecf | 1966 | switch (op & REQ_OP_MASK) { |
1b9a9ab7 MC |
1967 | case REQ_OP_WRITE: |
1968 | case REQ_OP_WRITE_SAME: | |
55782138 | 1969 | rwbs[i++] = 'W'; |
1b9a9ab7 MC |
1970 | break; |
1971 | case REQ_OP_DISCARD: | |
55782138 | 1972 | rwbs[i++] = 'D'; |
1b9a9ab7 | 1973 | break; |
288dab8a CH |
1974 | case REQ_OP_SECURE_ERASE: |
1975 | rwbs[i++] = 'D'; | |
1976 | rwbs[i++] = 'E'; | |
1977 | break; | |
3a5e02ce MC |
1978 | case REQ_OP_FLUSH: |
1979 | rwbs[i++] = 'F'; | |
1980 | break; | |
1b9a9ab7 | 1981 | case REQ_OP_READ: |
55782138 | 1982 | rwbs[i++] = 'R'; |
1b9a9ab7 MC |
1983 | break; |
1984 | default: | |
55782138 | 1985 | rwbs[i++] = 'N'; |
1b9a9ab7 | 1986 | } |
55782138 | 1987 | |
ef295ecf | 1988 | if (op & REQ_FUA) |
c09c47ca | 1989 | rwbs[i++] = 'F'; |
ef295ecf | 1990 | if (op & REQ_RAHEAD) |
55782138 | 1991 | rwbs[i++] = 'A'; |
ef295ecf | 1992 | if (op & REQ_SYNC) |
55782138 | 1993 | rwbs[i++] = 'S'; |
ef295ecf | 1994 | if (op & REQ_META) |
55782138 LZ |
1995 | rwbs[i++] = 'M'; |
1996 | ||
1997 | rwbs[i] = '\0'; | |
1998 | } | |
9ca8f8e5 | 1999 | EXPORT_SYMBOL_GPL(blk_fill_rwbs); |
55782138 | 2000 | |
55782138 LZ |
2001 | #endif /* CONFIG_EVENT_TRACING */ |
2002 |