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 | */ |
2056a782 JA |
6 | #include <linux/kernel.h> |
7 | #include <linux/blkdev.h> | |
8 | #include <linux/blktrace_api.h> | |
9 | #include <linux/percpu.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/mutex.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
2056a782 | 13 | #include <linux/debugfs.h> |
6e5fdeed | 14 | #include <linux/export.h> |
be1c6341 | 15 | #include <linux/time.h> |
939b3669 | 16 | #include <linux/uaccess.h> |
a404d557 | 17 | #include <linux/list.h> |
ca1136c9 | 18 | #include <linux/blk-cgroup.h> |
55782138 | 19 | |
18fbda91 OS |
20 | #include "../../block/blk.h" |
21 | ||
55782138 LZ |
22 | #include <trace/events/block.h> |
23 | ||
2db270a8 | 24 | #include "trace_output.h" |
2056a782 | 25 | |
55782138 LZ |
26 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
27 | ||
2056a782 JA |
28 | static unsigned int blktrace_seq __read_mostly = 1; |
29 | ||
c71a8961 | 30 | static struct trace_array *blk_tr; |
5006ea73 | 31 | static bool blk_tracer_enabled __read_mostly; |
c71a8961 | 32 | |
a404d557 JK |
33 | static LIST_HEAD(running_trace_list); |
34 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(running_trace_lock); | |
35 | ||
c71a8961 | 36 | /* Select an alternative, minimalistic output than the original one */ |
ef18012b | 37 | #define TRACE_BLK_OPT_CLASSIC 0x1 |
ca1136c9 | 38 | #define TRACE_BLK_OPT_CGROUP 0x2 |
69fd5c39 | 39 | #define TRACE_BLK_OPT_CGNAME 0x4 |
c71a8961 ACM |
40 | |
41 | static struct tracer_opt blk_tracer_opts[] = { | |
42 | /* Default disable the minimalistic output */ | |
157f9c00 | 43 | { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) }, |
ca1136c9 SL |
44 | #ifdef CONFIG_BLK_CGROUP |
45 | { TRACER_OPT(blk_cgroup, TRACE_BLK_OPT_CGROUP) }, | |
69fd5c39 | 46 | { TRACER_OPT(blk_cgname, TRACE_BLK_OPT_CGNAME) }, |
ca1136c9 | 47 | #endif |
c71a8961 ACM |
48 | { } |
49 | }; | |
50 | ||
51 | static struct tracer_flags blk_tracer_flags = { | |
52 | .val = 0, | |
53 | .opts = blk_tracer_opts, | |
54 | }; | |
55 | ||
5f3ea37c | 56 | /* Global reference count of probes */ |
a6da0024 JA |
57 | static DEFINE_MUTEX(blk_probe_mutex); |
58 | static int blk_probes_ref; | |
5f3ea37c | 59 | |
3c289ba7 | 60 | static void blk_register_tracepoints(void); |
5f3ea37c ACM |
61 | static void blk_unregister_tracepoints(void); |
62 | ||
be1c6341 OK |
63 | /* |
64 | * Send out a notify message. | |
65 | */ | |
a863055b | 66 | static void trace_note(struct blk_trace *bt, pid_t pid, int action, |
ca1136c9 SL |
67 | const void *data, size_t len, |
68 | union kernfs_node_id *cgid) | |
be1c6341 OK |
69 | { |
70 | struct blk_io_trace *t; | |
18cea459 | 71 | struct ring_buffer_event *event = NULL; |
e77405ad | 72 | struct ring_buffer *buffer = NULL; |
18cea459 LZ |
73 | int pc = 0; |
74 | int cpu = smp_processor_id(); | |
75 | bool blk_tracer = blk_tracer_enabled; | |
ca1136c9 | 76 | ssize_t cgid_len = cgid ? sizeof(*cgid) : 0; |
18cea459 LZ |
77 | |
78 | if (blk_tracer) { | |
12883efb | 79 | buffer = blk_tr->trace_buffer.buffer; |
18cea459 | 80 | pc = preempt_count(); |
e77405ad | 81 | event = trace_buffer_lock_reserve(buffer, TRACE_BLK, |
ca1136c9 | 82 | sizeof(*t) + len + cgid_len, |
18cea459 LZ |
83 | 0, pc); |
84 | if (!event) | |
85 | return; | |
86 | t = ring_buffer_event_data(event); | |
87 | goto record_it; | |
88 | } | |
be1c6341 | 89 | |
c71a8961 ACM |
90 | if (!bt->rchan) |
91 | return; | |
92 | ||
ca1136c9 | 93 | t = relay_reserve(bt->rchan, sizeof(*t) + len + cgid_len); |
d3d9d2a5 | 94 | if (t) { |
d3d9d2a5 | 95 | t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; |
2997c8c4 | 96 | t->time = ktime_to_ns(ktime_get()); |
18cea459 | 97 | record_it: |
d3d9d2a5 | 98 | t->device = bt->dev; |
ca1136c9 | 99 | t->action = action | (cgid ? __BLK_TN_CGROUP : 0); |
d3d9d2a5 JA |
100 | t->pid = pid; |
101 | t->cpu = cpu; | |
ca1136c9 SL |
102 | t->pdu_len = len + cgid_len; |
103 | if (cgid) | |
104 | memcpy((void *)t + sizeof(*t), cgid, cgid_len); | |
105 | memcpy((void *) t + sizeof(*t) + cgid_len, data, len); | |
18cea459 LZ |
106 | |
107 | if (blk_tracer) | |
b7f0c959 | 108 | trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc); |
d3d9d2a5 | 109 | } |
be1c6341 OK |
110 | } |
111 | ||
2056a782 JA |
112 | /* |
113 | * Send out a notify for this process, if we haven't done so since a trace | |
114 | * started | |
115 | */ | |
a404d557 | 116 | static void trace_note_tsk(struct task_struct *tsk) |
2056a782 | 117 | { |
a404d557 JK |
118 | unsigned long flags; |
119 | struct blk_trace *bt; | |
120 | ||
a863055b | 121 | tsk->btrace_seq = blktrace_seq; |
a404d557 JK |
122 | spin_lock_irqsave(&running_trace_lock, flags); |
123 | list_for_each_entry(bt, &running_trace_list, running_list) { | |
124 | trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, | |
ca1136c9 | 125 | sizeof(tsk->comm), NULL); |
a404d557 JK |
126 | } |
127 | spin_unlock_irqrestore(&running_trace_lock, flags); | |
be1c6341 | 128 | } |
2056a782 | 129 | |
be1c6341 OK |
130 | static void trace_note_time(struct blk_trace *bt) |
131 | { | |
59a37f8b | 132 | struct timespec64 now; |
be1c6341 OK |
133 | unsigned long flags; |
134 | u32 words[2]; | |
135 | ||
59a37f8b AB |
136 | /* need to check user space to see if this breaks in y2038 or y2106 */ |
137 | ktime_get_real_ts64(&now); | |
138 | words[0] = (u32)now.tv_sec; | |
be1c6341 OK |
139 | words[1] = now.tv_nsec; |
140 | ||
141 | local_irq_save(flags); | |
ca1136c9 | 142 | trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words), NULL); |
be1c6341 | 143 | local_irq_restore(flags); |
2056a782 JA |
144 | } |
145 | ||
35fe6d76 SL |
146 | void __trace_note_message(struct blk_trace *bt, struct blkcg *blkcg, |
147 | const char *fmt, ...) | |
9d5f09a4 AB |
148 | { |
149 | int n; | |
150 | va_list args; | |
14a73f54 | 151 | unsigned long flags; |
64565911 | 152 | char *buf; |
9d5f09a4 | 153 | |
18cea459 LZ |
154 | if (unlikely(bt->trace_state != Blktrace_running && |
155 | !blk_tracer_enabled)) | |
c71a8961 ACM |
156 | return; |
157 | ||
490da40d TM |
158 | /* |
159 | * If the BLK_TC_NOTIFY action mask isn't set, don't send any note | |
160 | * message to the trace. | |
161 | */ | |
162 | if (!(bt->act_mask & BLK_TC_NOTIFY)) | |
163 | return; | |
164 | ||
14a73f54 | 165 | local_irq_save(flags); |
d8a0349c | 166 | buf = this_cpu_ptr(bt->msg_data); |
9d5f09a4 | 167 | va_start(args, fmt); |
64565911 | 168 | n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); |
9d5f09a4 AB |
169 | va_end(args); |
170 | ||
35fe6d76 SL |
171 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP)) |
172 | blkcg = NULL; | |
173 | #ifdef CONFIG_BLK_CGROUP | |
174 | trace_note(bt, 0, BLK_TN_MESSAGE, buf, n, | |
175 | blkcg ? cgroup_get_kernfs_id(blkcg->css.cgroup) : NULL); | |
176 | #else | |
ca1136c9 | 177 | trace_note(bt, 0, BLK_TN_MESSAGE, buf, n, NULL); |
35fe6d76 | 178 | #endif |
14a73f54 | 179 | local_irq_restore(flags); |
9d5f09a4 AB |
180 | } |
181 | EXPORT_SYMBOL_GPL(__trace_note_message); | |
182 | ||
2056a782 JA |
183 | static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, |
184 | pid_t pid) | |
185 | { | |
186 | if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) | |
187 | return 1; | |
d0deef5b | 188 | if (sector && (sector < bt->start_lba || sector > bt->end_lba)) |
2056a782 JA |
189 | return 1; |
190 | if (bt->pid && pid != bt->pid) | |
191 | return 1; | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Data direction bit lookup | |
198 | */ | |
e4955c99 LZ |
199 | static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), |
200 | BLK_TC_ACT(BLK_TC_WRITE) }; | |
2056a782 | 201 | |
7b6d91da | 202 | #define BLK_TC_RAHEAD BLK_TC_AHEAD |
28a8f0d3 | 203 | #define BLK_TC_PREFLUSH BLK_TC_FLUSH |
7b6d91da | 204 | |
35ba8f70 | 205 | /* The ilog2() calls fall out because they're constant */ |
7b6d91da CH |
206 | #define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \ |
207 | (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name)) | |
2056a782 JA |
208 | |
209 | /* | |
210 | * The worker for the various blk_add_trace*() types. Fills out a | |
211 | * blk_io_trace structure and places it in a per-cpu subbuffer. | |
212 | */ | |
5f3ea37c | 213 | static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, |
1b9a9ab7 | 214 | int op, int op_flags, u32 what, int error, int pdu_len, |
ca1136c9 | 215 | void *pdu_data, union kernfs_node_id *cgid) |
2056a782 JA |
216 | { |
217 | struct task_struct *tsk = current; | |
c71a8961 | 218 | struct ring_buffer_event *event = NULL; |
e77405ad | 219 | struct ring_buffer *buffer = NULL; |
2056a782 | 220 | struct blk_io_trace *t; |
0a987751 | 221 | unsigned long flags = 0; |
2056a782 JA |
222 | unsigned long *sequence; |
223 | pid_t pid; | |
c71a8961 | 224 | int cpu, pc = 0; |
18cea459 | 225 | bool blk_tracer = blk_tracer_enabled; |
ca1136c9 | 226 | ssize_t cgid_len = cgid ? sizeof(*cgid) : 0; |
2056a782 | 227 | |
18cea459 | 228 | if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) |
2056a782 JA |
229 | return; |
230 | ||
1b9a9ab7 MC |
231 | what |= ddir_act[op_is_write(op) ? WRITE : READ]; |
232 | what |= MASK_TC_BIT(op_flags, SYNC); | |
233 | what |= MASK_TC_BIT(op_flags, RAHEAD); | |
234 | what |= MASK_TC_BIT(op_flags, META); | |
28a8f0d3 | 235 | what |= MASK_TC_BIT(op_flags, PREFLUSH); |
1b9a9ab7 | 236 | what |= MASK_TC_BIT(op_flags, FUA); |
7afafc8a | 237 | if (op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE) |
1b9a9ab7 | 238 | what |= BLK_TC_ACT(BLK_TC_DISCARD); |
3a5e02ce MC |
239 | if (op == REQ_OP_FLUSH) |
240 | what |= BLK_TC_ACT(BLK_TC_FLUSH); | |
ca1136c9 SL |
241 | if (cgid) |
242 | what |= __BLK_TA_CGROUP; | |
2056a782 JA |
243 | |
244 | pid = tsk->pid; | |
d0deef5b | 245 | if (act_log_check(bt, what, sector, pid)) |
2056a782 | 246 | return; |
c71a8961 ACM |
247 | cpu = raw_smp_processor_id(); |
248 | ||
18cea459 | 249 | if (blk_tracer) { |
c71a8961 ACM |
250 | tracing_record_cmdline(current); |
251 | ||
12883efb | 252 | buffer = blk_tr->trace_buffer.buffer; |
51a763dd | 253 | pc = preempt_count(); |
e77405ad | 254 | event = trace_buffer_lock_reserve(buffer, TRACE_BLK, |
ca1136c9 | 255 | sizeof(*t) + pdu_len + cgid_len, |
51a763dd | 256 | 0, pc); |
c71a8961 ACM |
257 | if (!event) |
258 | return; | |
51a763dd | 259 | t = ring_buffer_event_data(event); |
c71a8961 ACM |
260 | goto record_it; |
261 | } | |
2056a782 | 262 | |
a404d557 JK |
263 | if (unlikely(tsk->btrace_seq != blktrace_seq)) |
264 | trace_note_tsk(tsk); | |
265 | ||
2056a782 JA |
266 | /* |
267 | * A word about the locking here - we disable interrupts to reserve | |
268 | * some space in the relay per-cpu buffer, to prevent an irq | |
14a73f54 | 269 | * from coming in and stepping on our toes. |
2056a782 JA |
270 | */ |
271 | local_irq_save(flags); | |
ca1136c9 | 272 | t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len + cgid_len); |
2056a782 | 273 | if (t) { |
2056a782 JA |
274 | sequence = per_cpu_ptr(bt->sequence, cpu); |
275 | ||
276 | t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; | |
277 | t->sequence = ++(*sequence); | |
2997c8c4 | 278 | t->time = ktime_to_ns(ktime_get()); |
c71a8961 | 279 | record_it: |
08a06b83 | 280 | /* |
939b3669 ACM |
281 | * These two are not needed in ftrace as they are in the |
282 | * generic trace_entry, filled by tracing_generic_entry_update, | |
283 | * but for the trace_event->bin() synthesizer benefit we do it | |
284 | * here too. | |
285 | */ | |
286 | t->cpu = cpu; | |
287 | t->pid = pid; | |
08a06b83 | 288 | |
2056a782 JA |
289 | t->sector = sector; |
290 | t->bytes = bytes; | |
291 | t->action = what; | |
2056a782 | 292 | t->device = bt->dev; |
2056a782 | 293 | t->error = error; |
ca1136c9 | 294 | t->pdu_len = pdu_len + cgid_len; |
2056a782 | 295 | |
ca1136c9 SL |
296 | if (cgid_len) |
297 | memcpy((void *)t + sizeof(*t), cgid, cgid_len); | |
2056a782 | 298 | if (pdu_len) |
ca1136c9 | 299 | memcpy((void *)t + sizeof(*t) + cgid_len, pdu_data, pdu_len); |
c71a8961 | 300 | |
18cea459 | 301 | if (blk_tracer) { |
b7f0c959 | 302 | trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc); |
c71a8961 ACM |
303 | return; |
304 | } | |
2056a782 JA |
305 | } |
306 | ||
307 | local_irq_restore(flags); | |
308 | } | |
309 | ||
ad5dd549 | 310 | static void blk_trace_free(struct blk_trace *bt) |
2056a782 | 311 | { |
02c62304 | 312 | debugfs_remove(bt->msg_file); |
2056a782 | 313 | debugfs_remove(bt->dropped_file); |
f48fc4d3 | 314 | relay_close(bt->rchan); |
39cbb602 | 315 | debugfs_remove(bt->dir); |
2056a782 | 316 | free_percpu(bt->sequence); |
64565911 | 317 | free_percpu(bt->msg_data); |
2056a782 | 318 | kfree(bt); |
ad5dd549 LZ |
319 | } |
320 | ||
a6da0024 JA |
321 | static void get_probe_ref(void) |
322 | { | |
323 | mutex_lock(&blk_probe_mutex); | |
324 | if (++blk_probes_ref == 1) | |
325 | blk_register_tracepoints(); | |
326 | mutex_unlock(&blk_probe_mutex); | |
327 | } | |
328 | ||
329 | static void put_probe_ref(void) | |
330 | { | |
331 | mutex_lock(&blk_probe_mutex); | |
332 | if (!--blk_probes_ref) | |
333 | blk_unregister_tracepoints(); | |
334 | mutex_unlock(&blk_probe_mutex); | |
335 | } | |
336 | ||
ad5dd549 LZ |
337 | static void blk_trace_cleanup(struct blk_trace *bt) |
338 | { | |
339 | blk_trace_free(bt); | |
a6da0024 | 340 | put_probe_ref(); |
2056a782 JA |
341 | } |
342 | ||
1f2cac10 | 343 | static int __blk_trace_remove(struct request_queue *q) |
2056a782 JA |
344 | { |
345 | struct blk_trace *bt; | |
346 | ||
347 | bt = xchg(&q->blk_trace, NULL); | |
348 | if (!bt) | |
349 | return -EINVAL; | |
350 | ||
55547204 | 351 | if (bt->trace_state != Blktrace_running) |
2056a782 JA |
352 | blk_trace_cleanup(bt); |
353 | ||
354 | return 0; | |
355 | } | |
1f2cac10 JA |
356 | |
357 | int blk_trace_remove(struct request_queue *q) | |
358 | { | |
359 | int ret; | |
360 | ||
361 | mutex_lock(&q->blk_trace_mutex); | |
362 | ret = __blk_trace_remove(q); | |
363 | mutex_unlock(&q->blk_trace_mutex); | |
364 | ||
365 | return ret; | |
366 | } | |
6da127ad | 367 | EXPORT_SYMBOL_GPL(blk_trace_remove); |
2056a782 | 368 | |
2056a782 JA |
369 | static ssize_t blk_dropped_read(struct file *filp, char __user *buffer, |
370 | size_t count, loff_t *ppos) | |
371 | { | |
372 | struct blk_trace *bt = filp->private_data; | |
373 | char buf[16]; | |
374 | ||
375 | snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); | |
376 | ||
377 | return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); | |
378 | } | |
379 | ||
2b8693c0 | 380 | static const struct file_operations blk_dropped_fops = { |
2056a782 | 381 | .owner = THIS_MODULE, |
234e3405 | 382 | .open = simple_open, |
2056a782 | 383 | .read = blk_dropped_read, |
6038f373 | 384 | .llseek = default_llseek, |
2056a782 JA |
385 | }; |
386 | ||
02c62304 AB |
387 | static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, |
388 | size_t count, loff_t *ppos) | |
389 | { | |
390 | char *msg; | |
391 | struct blk_trace *bt; | |
392 | ||
7635b03a | 393 | if (count >= BLK_TN_MAX_MSG) |
02c62304 AB |
394 | return -EINVAL; |
395 | ||
16e5c1fc AV |
396 | msg = memdup_user_nul(buffer, count); |
397 | if (IS_ERR(msg)) | |
398 | return PTR_ERR(msg); | |
02c62304 | 399 | |
02c62304 | 400 | bt = filp->private_data; |
35fe6d76 | 401 | __trace_note_message(bt, NULL, "%s", msg); |
02c62304 AB |
402 | kfree(msg); |
403 | ||
404 | return count; | |
405 | } | |
406 | ||
407 | static const struct file_operations blk_msg_fops = { | |
408 | .owner = THIS_MODULE, | |
234e3405 | 409 | .open = simple_open, |
02c62304 | 410 | .write = blk_msg_write, |
6038f373 | 411 | .llseek = noop_llseek, |
02c62304 AB |
412 | }; |
413 | ||
2056a782 JA |
414 | /* |
415 | * Keep track of how many times we encountered a full subbuffer, to aid | |
416 | * the user space app in telling how many lost events there were. | |
417 | */ | |
418 | static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, | |
419 | void *prev_subbuf, size_t prev_padding) | |
420 | { | |
421 | struct blk_trace *bt; | |
422 | ||
423 | if (!relay_buf_full(buf)) | |
424 | return 1; | |
425 | ||
426 | bt = buf->chan->private_data; | |
427 | atomic_inc(&bt->dropped); | |
428 | return 0; | |
429 | } | |
430 | ||
431 | static int blk_remove_buf_file_callback(struct dentry *dentry) | |
432 | { | |
433 | debugfs_remove(dentry); | |
f48fc4d3 | 434 | |
2056a782 JA |
435 | return 0; |
436 | } | |
437 | ||
438 | static struct dentry *blk_create_buf_file_callback(const char *filename, | |
439 | struct dentry *parent, | |
f4ae40a6 | 440 | umode_t mode, |
2056a782 JA |
441 | struct rchan_buf *buf, |
442 | int *is_global) | |
443 | { | |
444 | return debugfs_create_file(filename, mode, parent, buf, | |
445 | &relay_file_operations); | |
446 | } | |
447 | ||
448 | static struct rchan_callbacks blk_relay_callbacks = { | |
449 | .subbuf_start = blk_subbuf_start_callback, | |
450 | .create_buf_file = blk_create_buf_file_callback, | |
451 | .remove_buf_file = blk_remove_buf_file_callback, | |
452 | }; | |
453 | ||
9908c309 LZ |
454 | static void blk_trace_setup_lba(struct blk_trace *bt, |
455 | struct block_device *bdev) | |
456 | { | |
457 | struct hd_struct *part = NULL; | |
458 | ||
459 | if (bdev) | |
460 | part = bdev->bd_part; | |
461 | ||
462 | if (part) { | |
463 | bt->start_lba = part->start_sect; | |
464 | bt->end_lba = part->start_sect + part->nr_sects; | |
465 | } else { | |
466 | bt->start_lba = 0; | |
467 | bt->end_lba = -1ULL; | |
468 | } | |
469 | } | |
470 | ||
2056a782 JA |
471 | /* |
472 | * Setup everything required to start tracing | |
473 | */ | |
a428d314 OS |
474 | static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
475 | struct block_device *bdev, | |
476 | struct blk_user_trace_setup *buts) | |
2056a782 | 477 | { |
cdea01b2 | 478 | struct blk_trace *bt = NULL; |
2056a782 | 479 | struct dentry *dir = NULL; |
ff14417c | 480 | int ret; |
2056a782 | 481 | |
171044d4 | 482 | if (!buts->buf_size || !buts->buf_nr) |
2056a782 JA |
483 | return -EINVAL; |
484 | ||
e1a41324 LB |
485 | if (!blk_debugfs_root) |
486 | return -ENOENT; | |
487 | ||
0497b345 JA |
488 | strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); |
489 | buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; | |
2056a782 JA |
490 | |
491 | /* | |
492 | * some device names have larger paths - convert the slashes | |
493 | * to underscores for this to work as expected | |
494 | */ | |
ff14417c | 495 | strreplace(buts->name, '/', '_'); |
2056a782 | 496 | |
2056a782 JA |
497 | bt = kzalloc(sizeof(*bt), GFP_KERNEL); |
498 | if (!bt) | |
ad5dd549 | 499 | return -ENOMEM; |
2056a782 | 500 | |
ad5dd549 | 501 | ret = -ENOMEM; |
2056a782 JA |
502 | bt->sequence = alloc_percpu(unsigned long); |
503 | if (!bt->sequence) | |
504 | goto err; | |
505 | ||
313e458f | 506 | bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); |
64565911 JA |
507 | if (!bt->msg_data) |
508 | goto err; | |
509 | ||
2056a782 | 510 | ret = -ENOENT; |
f48fc4d3 | 511 | |
6ac93117 OS |
512 | dir = debugfs_lookup(buts->name, blk_debugfs_root); |
513 | if (!dir) | |
514 | bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root); | |
2056a782 JA |
515 | if (!dir) |
516 | goto err; | |
517 | ||
6da127ad | 518 | bt->dev = dev; |
2056a782 | 519 | atomic_set(&bt->dropped, 0); |
a404d557 | 520 | INIT_LIST_HEAD(&bt->running_list); |
2056a782 JA |
521 | |
522 | ret = -EIO; | |
939b3669 ACM |
523 | bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, |
524 | &blk_dropped_fops); | |
2056a782 JA |
525 | if (!bt->dropped_file) |
526 | goto err; | |
527 | ||
02c62304 AB |
528 | bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); |
529 | if (!bt->msg_file) | |
530 | goto err; | |
531 | ||
171044d4 AB |
532 | bt->rchan = relay_open("trace", dir, buts->buf_size, |
533 | buts->buf_nr, &blk_relay_callbacks, bt); | |
2056a782 JA |
534 | if (!bt->rchan) |
535 | goto err; | |
2056a782 | 536 | |
171044d4 | 537 | bt->act_mask = buts->act_mask; |
2056a782 JA |
538 | if (!bt->act_mask) |
539 | bt->act_mask = (u16) -1; | |
540 | ||
9908c309 | 541 | blk_trace_setup_lba(bt, bdev); |
2056a782 | 542 | |
d0deef5b SD |
543 | /* overwrite with user settings */ |
544 | if (buts->start_lba) | |
545 | bt->start_lba = buts->start_lba; | |
546 | if (buts->end_lba) | |
547 | bt->end_lba = buts->end_lba; | |
548 | ||
171044d4 | 549 | bt->pid = buts->pid; |
2056a782 JA |
550 | bt->trace_state = Blktrace_setup; |
551 | ||
552 | ret = -EBUSY; | |
cdea01b2 | 553 | if (cmpxchg(&q->blk_trace, NULL, bt)) |
2056a782 | 554 | goto err; |
2056a782 | 555 | |
a6da0024 | 556 | get_probe_ref(); |
cbe28296 | 557 | |
6ac93117 | 558 | ret = 0; |
2056a782 | 559 | err: |
6ac93117 OS |
560 | if (dir && !bt->dir) |
561 | dput(dir); | |
562 | if (ret) | |
563 | blk_trace_free(bt); | |
2056a782 JA |
564 | return ret; |
565 | } | |
171044d4 | 566 | |
1f2cac10 JA |
567 | static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
568 | struct block_device *bdev, char __user *arg) | |
171044d4 AB |
569 | { |
570 | struct blk_user_trace_setup buts; | |
571 | int ret; | |
572 | ||
573 | ret = copy_from_user(&buts, arg, sizeof(buts)); | |
574 | if (ret) | |
575 | return -EFAULT; | |
576 | ||
d0deef5b | 577 | ret = do_blk_trace_setup(q, name, dev, bdev, &buts); |
171044d4 AB |
578 | if (ret) |
579 | return ret; | |
580 | ||
9a8c28c8 | 581 | if (copy_to_user(arg, &buts, sizeof(buts))) { |
2967acbb | 582 | __blk_trace_remove(q); |
171044d4 | 583 | return -EFAULT; |
9a8c28c8 | 584 | } |
171044d4 AB |
585 | return 0; |
586 | } | |
1f2cac10 JA |
587 | |
588 | int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, | |
589 | struct block_device *bdev, | |
590 | char __user *arg) | |
591 | { | |
592 | int ret; | |
593 | ||
594 | mutex_lock(&q->blk_trace_mutex); | |
595 | ret = __blk_trace_setup(q, name, dev, bdev, arg); | |
596 | mutex_unlock(&q->blk_trace_mutex); | |
597 | ||
598 | return ret; | |
599 | } | |
6da127ad | 600 | EXPORT_SYMBOL_GPL(blk_trace_setup); |
2056a782 | 601 | |
62c2a7d9 AB |
602 | #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) |
603 | static int compat_blk_trace_setup(struct request_queue *q, char *name, | |
604 | dev_t dev, struct block_device *bdev, | |
605 | char __user *arg) | |
606 | { | |
607 | struct blk_user_trace_setup buts; | |
608 | struct compat_blk_user_trace_setup cbuts; | |
609 | int ret; | |
610 | ||
611 | if (copy_from_user(&cbuts, arg, sizeof(cbuts))) | |
612 | return -EFAULT; | |
613 | ||
614 | buts = (struct blk_user_trace_setup) { | |
615 | .act_mask = cbuts.act_mask, | |
616 | .buf_size = cbuts.buf_size, | |
617 | .buf_nr = cbuts.buf_nr, | |
618 | .start_lba = cbuts.start_lba, | |
619 | .end_lba = cbuts.end_lba, | |
620 | .pid = cbuts.pid, | |
621 | }; | |
62c2a7d9 AB |
622 | |
623 | ret = do_blk_trace_setup(q, name, dev, bdev, &buts); | |
624 | if (ret) | |
625 | return ret; | |
626 | ||
f8c5e944 | 627 | if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) { |
2967acbb | 628 | __blk_trace_remove(q); |
62c2a7d9 AB |
629 | return -EFAULT; |
630 | } | |
631 | ||
632 | return 0; | |
633 | } | |
634 | #endif | |
635 | ||
1f2cac10 | 636 | static int __blk_trace_startstop(struct request_queue *q, int start) |
2056a782 | 637 | { |
2056a782 | 638 | int ret; |
939b3669 | 639 | struct blk_trace *bt = q->blk_trace; |
2056a782 | 640 | |
939b3669 | 641 | if (bt == NULL) |
2056a782 JA |
642 | return -EINVAL; |
643 | ||
644 | /* | |
645 | * For starting a trace, we can transition from a setup or stopped | |
646 | * trace. For stopping a trace, the state must be running | |
647 | */ | |
648 | ret = -EINVAL; | |
649 | if (start) { | |
650 | if (bt->trace_state == Blktrace_setup || | |
651 | bt->trace_state == Blktrace_stopped) { | |
652 | blktrace_seq++; | |
653 | smp_mb(); | |
654 | bt->trace_state = Blktrace_running; | |
a404d557 JK |
655 | spin_lock_irq(&running_trace_lock); |
656 | list_add(&bt->running_list, &running_trace_list); | |
657 | spin_unlock_irq(&running_trace_lock); | |
be1c6341 OK |
658 | |
659 | trace_note_time(bt); | |
2056a782 JA |
660 | ret = 0; |
661 | } | |
662 | } else { | |
663 | if (bt->trace_state == Blktrace_running) { | |
664 | bt->trace_state = Blktrace_stopped; | |
a404d557 JK |
665 | spin_lock_irq(&running_trace_lock); |
666 | list_del_init(&bt->running_list); | |
667 | spin_unlock_irq(&running_trace_lock); | |
2056a782 JA |
668 | relay_flush(bt->rchan); |
669 | ret = 0; | |
670 | } | |
671 | } | |
672 | ||
673 | return ret; | |
674 | } | |
1f2cac10 JA |
675 | |
676 | int blk_trace_startstop(struct request_queue *q, int start) | |
677 | { | |
678 | int ret; | |
679 | ||
680 | mutex_lock(&q->blk_trace_mutex); | |
681 | ret = __blk_trace_startstop(q, start); | |
682 | mutex_unlock(&q->blk_trace_mutex); | |
683 | ||
684 | return ret; | |
685 | } | |
6da127ad | 686 | EXPORT_SYMBOL_GPL(blk_trace_startstop); |
2056a782 | 687 | |
5acb3cc2 WL |
688 | /* |
689 | * When reading or writing the blktrace sysfs files, the references to the | |
690 | * opened sysfs or device files should prevent the underlying block device | |
691 | * from being removed. So no further delete protection is really needed. | |
692 | */ | |
693 | ||
2056a782 JA |
694 | /** |
695 | * blk_trace_ioctl: - handle the ioctls associated with tracing | |
696 | * @bdev: the block device | |
ef18012b | 697 | * @cmd: the ioctl cmd |
2056a782 JA |
698 | * @arg: the argument data, if any |
699 | * | |
700 | **/ | |
701 | int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) | |
702 | { | |
165125e1 | 703 | struct request_queue *q; |
2056a782 | 704 | int ret, start = 0; |
6da127ad | 705 | char b[BDEVNAME_SIZE]; |
2056a782 JA |
706 | |
707 | q = bdev_get_queue(bdev); | |
708 | if (!q) | |
709 | return -ENXIO; | |
710 | ||
5acb3cc2 | 711 | mutex_lock(&q->blk_trace_mutex); |
2056a782 JA |
712 | |
713 | switch (cmd) { | |
714 | case BLKTRACESETUP: | |
f36f21ec | 715 | bdevname(bdev, b); |
1f2cac10 | 716 | ret = __blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); |
2056a782 | 717 | break; |
62c2a7d9 AB |
718 | #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) |
719 | case BLKTRACESETUP32: | |
720 | bdevname(bdev, b); | |
721 | ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); | |
722 | break; | |
723 | #endif | |
2056a782 JA |
724 | case BLKTRACESTART: |
725 | start = 1; | |
726 | case BLKTRACESTOP: | |
1f2cac10 | 727 | ret = __blk_trace_startstop(q, start); |
2056a782 JA |
728 | break; |
729 | case BLKTRACETEARDOWN: | |
1f2cac10 | 730 | ret = __blk_trace_remove(q); |
2056a782 JA |
731 | break; |
732 | default: | |
733 | ret = -ENOTTY; | |
734 | break; | |
735 | } | |
736 | ||
5acb3cc2 | 737 | mutex_unlock(&q->blk_trace_mutex); |
2056a782 JA |
738 | return ret; |
739 | } | |
740 | ||
741 | /** | |
742 | * blk_trace_shutdown: - stop and cleanup trace structures | |
743 | * @q: the request queue associated with the device | |
744 | * | |
745 | **/ | |
165125e1 | 746 | void blk_trace_shutdown(struct request_queue *q) |
2056a782 | 747 | { |
1f2cac10 JA |
748 | mutex_lock(&q->blk_trace_mutex); |
749 | ||
6c5c9341 | 750 | if (q->blk_trace) { |
1f2cac10 JA |
751 | __blk_trace_startstop(q, 0); |
752 | __blk_trace_remove(q); | |
6c5c9341 | 753 | } |
1f2cac10 JA |
754 | |
755 | mutex_unlock(&q->blk_trace_mutex); | |
2056a782 | 756 | } |
5f3ea37c | 757 | |
ca1136c9 SL |
758 | #ifdef CONFIG_BLK_CGROUP |
759 | static union kernfs_node_id * | |
760 | blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) | |
761 | { | |
762 | struct blk_trace *bt = q->blk_trace; | |
763 | ||
764 | if (!bt || !(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP)) | |
765 | return NULL; | |
766 | ||
767 | if (!bio->bi_css) | |
768 | return NULL; | |
769 | return cgroup_get_kernfs_id(bio->bi_css->cgroup); | |
770 | } | |
771 | #else | |
772 | static union kernfs_node_id * | |
773 | blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) | |
774 | { | |
775 | return NULL; | |
776 | } | |
777 | #endif | |
778 | ||
779 | static union kernfs_node_id * | |
780 | blk_trace_request_get_cgid(struct request_queue *q, struct request *rq) | |
781 | { | |
782 | if (!rq->bio) | |
783 | return NULL; | |
784 | /* Use the first bio */ | |
785 | return blk_trace_bio_get_cgid(q, rq->bio); | |
786 | } | |
787 | ||
5f3ea37c ACM |
788 | /* |
789 | * blktrace probes | |
790 | */ | |
791 | ||
792 | /** | |
793 | * blk_add_trace_rq - Add a trace for a request oriented action | |
5f3ea37c | 794 | * @rq: the source request |
caf7df12 | 795 | * @error: return status to log |
af5040da | 796 | * @nr_bytes: number of completed bytes |
5f3ea37c | 797 | * @what: the action |
ca1136c9 | 798 | * @cgid: the cgroup info |
5f3ea37c ACM |
799 | * |
800 | * Description: | |
801 | * Records an action against a request. Will log the bio offset + size. | |
802 | * | |
803 | **/ | |
caf7df12 | 804 | static void blk_add_trace_rq(struct request *rq, int error, |
ca1136c9 SL |
805 | unsigned int nr_bytes, u32 what, |
806 | union kernfs_node_id *cgid) | |
5f3ea37c | 807 | { |
caf7df12 | 808 | struct blk_trace *bt = rq->q->blk_trace; |
5f3ea37c ACM |
809 | |
810 | if (likely(!bt)) | |
811 | return; | |
812 | ||
57292b58 | 813 | if (blk_rq_is_passthrough(rq)) |
5f3ea37c | 814 | what |= BLK_TC_ACT(BLK_TC_PC); |
48b77ad6 | 815 | else |
5f3ea37c | 816 | what |= BLK_TC_ACT(BLK_TC_FS); |
48b77ad6 CH |
817 | |
818 | __blk_add_trace(bt, blk_rq_trace_sector(rq), nr_bytes, req_op(rq), | |
ca1136c9 | 819 | rq->cmd_flags, what, error, 0, NULL, cgid); |
5f3ea37c ACM |
820 | } |
821 | ||
38516ab5 SR |
822 | static void blk_add_trace_rq_insert(void *ignore, |
823 | struct request_queue *q, struct request *rq) | |
5f3ea37c | 824 | { |
ca1136c9 SL |
825 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_INSERT, |
826 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
827 | } |
828 | ||
38516ab5 SR |
829 | static void blk_add_trace_rq_issue(void *ignore, |
830 | struct request_queue *q, struct request *rq) | |
5f3ea37c | 831 | { |
ca1136c9 SL |
832 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_ISSUE, |
833 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
834 | } |
835 | ||
38516ab5 SR |
836 | static void blk_add_trace_rq_requeue(void *ignore, |
837 | struct request_queue *q, | |
939b3669 | 838 | struct request *rq) |
5f3ea37c | 839 | { |
ca1136c9 SL |
840 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_REQUEUE, |
841 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
842 | } |
843 | ||
caf7df12 CH |
844 | static void blk_add_trace_rq_complete(void *ignore, struct request *rq, |
845 | int error, unsigned int nr_bytes) | |
5f3ea37c | 846 | { |
ca1136c9 SL |
847 | blk_add_trace_rq(rq, error, nr_bytes, BLK_TA_COMPLETE, |
848 | blk_trace_request_get_cgid(rq->q, rq)); | |
5f3ea37c ACM |
849 | } |
850 | ||
851 | /** | |
852 | * blk_add_trace_bio - Add a trace for a bio oriented action | |
853 | * @q: queue the io is for | |
854 | * @bio: the source bio | |
855 | * @what: the action | |
797a455d | 856 | * @error: error, if any |
5f3ea37c ACM |
857 | * |
858 | * Description: | |
859 | * Records an action against a bio. Will log the bio offset + size. | |
860 | * | |
861 | **/ | |
862 | static void blk_add_trace_bio(struct request_queue *q, struct bio *bio, | |
1690102d | 863 | u32 what, int error) |
5f3ea37c ACM |
864 | { |
865 | struct blk_trace *bt = q->blk_trace; | |
866 | ||
867 | if (likely(!bt)) | |
868 | return; | |
869 | ||
4f024f37 | 870 | __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, |
1690102d MPS |
871 | bio_op(bio), bio->bi_opf, what, error, 0, NULL, |
872 | blk_trace_bio_get_cgid(q, bio)); | |
5f3ea37c ACM |
873 | } |
874 | ||
38516ab5 SR |
875 | static void blk_add_trace_bio_bounce(void *ignore, |
876 | struct request_queue *q, struct bio *bio) | |
5f3ea37c | 877 | { |
1690102d | 878 | blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0); |
5f3ea37c ACM |
879 | } |
880 | ||
0a82a8d1 LT |
881 | static void blk_add_trace_bio_complete(void *ignore, |
882 | struct request_queue *q, struct bio *bio, | |
883 | int error) | |
5f3ea37c | 884 | { |
1690102d | 885 | blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error); |
5f3ea37c ACM |
886 | } |
887 | ||
38516ab5 SR |
888 | static void blk_add_trace_bio_backmerge(void *ignore, |
889 | struct request_queue *q, | |
8c1cf6bb | 890 | struct request *rq, |
939b3669 | 891 | struct bio *bio) |
5f3ea37c | 892 | { |
1690102d | 893 | blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0); |
5f3ea37c ACM |
894 | } |
895 | ||
38516ab5 SR |
896 | static void blk_add_trace_bio_frontmerge(void *ignore, |
897 | struct request_queue *q, | |
8c1cf6bb | 898 | struct request *rq, |
939b3669 | 899 | struct bio *bio) |
5f3ea37c | 900 | { |
1690102d | 901 | blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0); |
5f3ea37c ACM |
902 | } |
903 | ||
38516ab5 SR |
904 | static void blk_add_trace_bio_queue(void *ignore, |
905 | struct request_queue *q, struct bio *bio) | |
5f3ea37c | 906 | { |
1690102d | 907 | blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0); |
5f3ea37c ACM |
908 | } |
909 | ||
38516ab5 SR |
910 | static void blk_add_trace_getrq(void *ignore, |
911 | struct request_queue *q, | |
939b3669 | 912 | struct bio *bio, int rw) |
5f3ea37c ACM |
913 | { |
914 | if (bio) | |
1690102d | 915 | blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0); |
5f3ea37c ACM |
916 | else { |
917 | struct blk_trace *bt = q->blk_trace; | |
918 | ||
919 | if (bt) | |
1b9a9ab7 | 920 | __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_GETRQ, 0, 0, |
ca1136c9 | 921 | NULL, NULL); |
5f3ea37c ACM |
922 | } |
923 | } | |
924 | ||
925 | ||
38516ab5 SR |
926 | static void blk_add_trace_sleeprq(void *ignore, |
927 | struct request_queue *q, | |
939b3669 | 928 | struct bio *bio, int rw) |
5f3ea37c ACM |
929 | { |
930 | if (bio) | |
1690102d | 931 | blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0); |
5f3ea37c ACM |
932 | else { |
933 | struct blk_trace *bt = q->blk_trace; | |
934 | ||
935 | if (bt) | |
1b9a9ab7 | 936 | __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_SLEEPRQ, |
ca1136c9 | 937 | 0, 0, NULL, NULL); |
5f3ea37c ACM |
938 | } |
939 | } | |
940 | ||
38516ab5 | 941 | static void blk_add_trace_plug(void *ignore, struct request_queue *q) |
5f3ea37c ACM |
942 | { |
943 | struct blk_trace *bt = q->blk_trace; | |
944 | ||
945 | if (bt) | |
ca1136c9 | 946 | __blk_add_trace(bt, 0, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL, NULL); |
5f3ea37c ACM |
947 | } |
948 | ||
49cac01e JA |
949 | static void blk_add_trace_unplug(void *ignore, struct request_queue *q, |
950 | unsigned int depth, bool explicit) | |
5f3ea37c ACM |
951 | { |
952 | struct blk_trace *bt = q->blk_trace; | |
953 | ||
954 | if (bt) { | |
94b5eb28 | 955 | __be64 rpdu = cpu_to_be64(depth); |
49cac01e | 956 | u32 what; |
5f3ea37c | 957 | |
49cac01e JA |
958 | if (explicit) |
959 | what = BLK_TA_UNPLUG_IO; | |
960 | else | |
961 | what = BLK_TA_UNPLUG_TIMER; | |
962 | ||
ca1136c9 | 963 | __blk_add_trace(bt, 0, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu, NULL); |
5f3ea37c ACM |
964 | } |
965 | } | |
966 | ||
38516ab5 SR |
967 | static void blk_add_trace_split(void *ignore, |
968 | struct request_queue *q, struct bio *bio, | |
5f3ea37c ACM |
969 | unsigned int pdu) |
970 | { | |
971 | struct blk_trace *bt = q->blk_trace; | |
972 | ||
973 | if (bt) { | |
974 | __be64 rpdu = cpu_to_be64(pdu); | |
975 | ||
4f024f37 | 976 | __blk_add_trace(bt, bio->bi_iter.bi_sector, |
1eff9d32 | 977 | bio->bi_iter.bi_size, bio_op(bio), bio->bi_opf, |
4e4cbee9 | 978 | BLK_TA_SPLIT, bio->bi_status, sizeof(rpdu), |
ca1136c9 | 979 | &rpdu, blk_trace_bio_get_cgid(q, bio)); |
5f3ea37c ACM |
980 | } |
981 | } | |
982 | ||
983 | /** | |
d07335e5 | 984 | * blk_add_trace_bio_remap - Add a trace for a bio-remap operation |
546cf44a | 985 | * @ignore: trace callback data parameter (not used) |
5f3ea37c ACM |
986 | * @q: queue the io is for |
987 | * @bio: the source bio | |
988 | * @dev: target device | |
a42aaa3b | 989 | * @from: source sector |
5f3ea37c ACM |
990 | * |
991 | * Description: | |
992 | * Device mapper or raid target sometimes need to split a bio because | |
993 | * it spans a stripe (or similar). Add a trace for that action. | |
994 | * | |
995 | **/ | |
d07335e5 MS |
996 | static void blk_add_trace_bio_remap(void *ignore, |
997 | struct request_queue *q, struct bio *bio, | |
998 | dev_t dev, sector_t from) | |
5f3ea37c ACM |
999 | { |
1000 | struct blk_trace *bt = q->blk_trace; | |
1001 | struct blk_io_trace_remap r; | |
1002 | ||
1003 | if (likely(!bt)) | |
1004 | return; | |
1005 | ||
a42aaa3b | 1006 | r.device_from = cpu_to_be32(dev); |
74d46992 | 1007 | r.device_to = cpu_to_be32(bio_dev(bio)); |
a42aaa3b | 1008 | r.sector_from = cpu_to_be64(from); |
5f3ea37c | 1009 | |
4f024f37 | 1010 | __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, |
4e4cbee9 | 1011 | bio_op(bio), bio->bi_opf, BLK_TA_REMAP, bio->bi_status, |
ca1136c9 | 1012 | sizeof(r), &r, blk_trace_bio_get_cgid(q, bio)); |
5f3ea37c ACM |
1013 | } |
1014 | ||
b0da3f0d JN |
1015 | /** |
1016 | * blk_add_trace_rq_remap - Add a trace for a request-remap operation | |
546cf44a | 1017 | * @ignore: trace callback data parameter (not used) |
b0da3f0d JN |
1018 | * @q: queue the io is for |
1019 | * @rq: the source request | |
1020 | * @dev: target device | |
1021 | * @from: source sector | |
1022 | * | |
1023 | * Description: | |
1024 | * Device mapper remaps request to other devices. | |
1025 | * Add a trace for that action. | |
1026 | * | |
1027 | **/ | |
38516ab5 SR |
1028 | static void blk_add_trace_rq_remap(void *ignore, |
1029 | struct request_queue *q, | |
b0da3f0d JN |
1030 | struct request *rq, dev_t dev, |
1031 | sector_t from) | |
1032 | { | |
1033 | struct blk_trace *bt = q->blk_trace; | |
1034 | struct blk_io_trace_remap r; | |
1035 | ||
1036 | if (likely(!bt)) | |
1037 | return; | |
1038 | ||
1039 | r.device_from = cpu_to_be32(dev); | |
1040 | r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); | |
1041 | r.sector_from = cpu_to_be64(from); | |
1042 | ||
1043 | __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), | |
caf7df12 | 1044 | rq_data_dir(rq), 0, BLK_TA_REMAP, 0, |
ca1136c9 | 1045 | sizeof(r), &r, blk_trace_request_get_cgid(q, rq)); |
b0da3f0d JN |
1046 | } |
1047 | ||
5f3ea37c ACM |
1048 | /** |
1049 | * blk_add_driver_data - Add binary message with driver-specific data | |
1050 | * @q: queue the io is for | |
1051 | * @rq: io request | |
1052 | * @data: driver-specific data | |
1053 | * @len: length of driver-specific data | |
1054 | * | |
1055 | * Description: | |
1056 | * Some drivers might want to write driver-specific data per request. | |
1057 | * | |
1058 | **/ | |
1059 | void blk_add_driver_data(struct request_queue *q, | |
1060 | struct request *rq, | |
1061 | void *data, size_t len) | |
1062 | { | |
1063 | struct blk_trace *bt = q->blk_trace; | |
1064 | ||
1065 | if (likely(!bt)) | |
1066 | return; | |
1067 | ||
48b77ad6 | 1068 | __blk_add_trace(bt, blk_rq_trace_sector(rq), blk_rq_bytes(rq), 0, 0, |
ca1136c9 SL |
1069 | BLK_TA_DRV_DATA, 0, len, data, |
1070 | blk_trace_request_get_cgid(q, rq)); | |
5f3ea37c ACM |
1071 | } |
1072 | EXPORT_SYMBOL_GPL(blk_add_driver_data); | |
1073 | ||
3c289ba7 | 1074 | static void blk_register_tracepoints(void) |
5f3ea37c ACM |
1075 | { |
1076 | int ret; | |
1077 | ||
38516ab5 | 1078 | ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); |
5f3ea37c | 1079 | WARN_ON(ret); |
38516ab5 | 1080 | ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); |
5f3ea37c | 1081 | WARN_ON(ret); |
38516ab5 | 1082 | ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); |
5f3ea37c | 1083 | WARN_ON(ret); |
38516ab5 | 1084 | ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); |
5f3ea37c | 1085 | WARN_ON(ret); |
38516ab5 | 1086 | ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); |
5f3ea37c | 1087 | WARN_ON(ret); |
38516ab5 | 1088 | ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); |
5f3ea37c | 1089 | WARN_ON(ret); |
38516ab5 | 1090 | ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); |
5f3ea37c | 1091 | WARN_ON(ret); |
38516ab5 | 1092 | ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); |
5f3ea37c | 1093 | WARN_ON(ret); |
38516ab5 | 1094 | ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); |
5f3ea37c | 1095 | WARN_ON(ret); |
38516ab5 | 1096 | ret = register_trace_block_getrq(blk_add_trace_getrq, NULL); |
5f3ea37c | 1097 | WARN_ON(ret); |
38516ab5 | 1098 | ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); |
5f3ea37c | 1099 | WARN_ON(ret); |
38516ab5 | 1100 | ret = register_trace_block_plug(blk_add_trace_plug, NULL); |
5f3ea37c | 1101 | WARN_ON(ret); |
49cac01e | 1102 | ret = register_trace_block_unplug(blk_add_trace_unplug, NULL); |
5f3ea37c | 1103 | WARN_ON(ret); |
38516ab5 | 1104 | ret = register_trace_block_split(blk_add_trace_split, NULL); |
5f3ea37c | 1105 | WARN_ON(ret); |
d07335e5 | 1106 | ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); |
5f3ea37c | 1107 | WARN_ON(ret); |
38516ab5 | 1108 | ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); |
b0da3f0d | 1109 | WARN_ON(ret); |
5f3ea37c ACM |
1110 | } |
1111 | ||
1112 | static void blk_unregister_tracepoints(void) | |
1113 | { | |
38516ab5 | 1114 | unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); |
d07335e5 | 1115 | unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); |
38516ab5 | 1116 | unregister_trace_block_split(blk_add_trace_split, NULL); |
49cac01e | 1117 | unregister_trace_block_unplug(blk_add_trace_unplug, NULL); |
38516ab5 SR |
1118 | unregister_trace_block_plug(blk_add_trace_plug, NULL); |
1119 | unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); | |
1120 | unregister_trace_block_getrq(blk_add_trace_getrq, NULL); | |
1121 | unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); | |
1122 | unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); | |
1123 | unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); | |
1124 | unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); | |
1125 | unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); | |
1126 | unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); | |
1127 | unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); | |
1128 | unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); | |
1129 | unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); | |
5f3ea37c ACM |
1130 | |
1131 | tracepoint_synchronize_unregister(); | |
1132 | } | |
c71a8961 ACM |
1133 | |
1134 | /* | |
1135 | * struct blk_io_tracer formatting routines | |
1136 | */ | |
1137 | ||
1138 | static void fill_rwbs(char *rwbs, const struct blk_io_trace *t) | |
1139 | { | |
157f9c00 | 1140 | int i = 0; |
65796348 | 1141 | int tc = t->action >> BLK_TC_SHIFT; |
157f9c00 | 1142 | |
ca1136c9 | 1143 | if ((t->action & ~__BLK_TN_CGROUP) == BLK_TN_MESSAGE) { |
18cea459 LZ |
1144 | rwbs[i++] = 'N'; |
1145 | goto out; | |
1146 | } | |
1147 | ||
c09c47ca NK |
1148 | if (tc & BLK_TC_FLUSH) |
1149 | rwbs[i++] = 'F'; | |
1150 | ||
65796348 | 1151 | if (tc & BLK_TC_DISCARD) |
157f9c00 | 1152 | rwbs[i++] = 'D'; |
65796348 | 1153 | else if (tc & BLK_TC_WRITE) |
157f9c00 ACM |
1154 | rwbs[i++] = 'W'; |
1155 | else if (t->bytes) | |
1156 | rwbs[i++] = 'R'; | |
1157 | else | |
1158 | rwbs[i++] = 'N'; | |
1159 | ||
c09c47ca NK |
1160 | if (tc & BLK_TC_FUA) |
1161 | rwbs[i++] = 'F'; | |
65796348 | 1162 | if (tc & BLK_TC_AHEAD) |
157f9c00 | 1163 | rwbs[i++] = 'A'; |
65796348 | 1164 | if (tc & BLK_TC_SYNC) |
157f9c00 | 1165 | rwbs[i++] = 'S'; |
65796348 | 1166 | if (tc & BLK_TC_META) |
157f9c00 | 1167 | rwbs[i++] = 'M'; |
18cea459 | 1168 | out: |
157f9c00 | 1169 | rwbs[i] = '\0'; |
c71a8961 ACM |
1170 | } |
1171 | ||
1172 | static inline | |
1173 | const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) | |
1174 | { | |
1175 | return (const struct blk_io_trace *)ent; | |
1176 | } | |
1177 | ||
ca1136c9 SL |
1178 | static inline const void *pdu_start(const struct trace_entry *ent, bool has_cg) |
1179 | { | |
1180 | return (void *)(te_blk_io_trace(ent) + 1) + | |
1181 | (has_cg ? sizeof(union kernfs_node_id) : 0); | |
1182 | } | |
1183 | ||
1184 | static inline const void *cgid_start(const struct trace_entry *ent) | |
c71a8961 | 1185 | { |
ca1136c9 SL |
1186 | return (void *)(te_blk_io_trace(ent) + 1); |
1187 | } | |
1188 | ||
1189 | static inline int pdu_real_len(const struct trace_entry *ent, bool has_cg) | |
1190 | { | |
1191 | return te_blk_io_trace(ent)->pdu_len - | |
1192 | (has_cg ? sizeof(union kernfs_node_id) : 0); | |
c71a8961 ACM |
1193 | } |
1194 | ||
66de7792 LZ |
1195 | static inline u32 t_action(const struct trace_entry *ent) |
1196 | { | |
1197 | return te_blk_io_trace(ent)->action; | |
1198 | } | |
1199 | ||
1200 | static inline u32 t_bytes(const struct trace_entry *ent) | |
1201 | { | |
1202 | return te_blk_io_trace(ent)->bytes; | |
1203 | } | |
1204 | ||
c71a8961 ACM |
1205 | static inline u32 t_sec(const struct trace_entry *ent) |
1206 | { | |
1207 | return te_blk_io_trace(ent)->bytes >> 9; | |
1208 | } | |
1209 | ||
1210 | static inline unsigned long long t_sector(const struct trace_entry *ent) | |
1211 | { | |
1212 | return te_blk_io_trace(ent)->sector; | |
1213 | } | |
1214 | ||
1215 | static inline __u16 t_error(const struct trace_entry *ent) | |
1216 | { | |
e0dc81be | 1217 | return te_blk_io_trace(ent)->error; |
c71a8961 ACM |
1218 | } |
1219 | ||
ca1136c9 | 1220 | static __u64 get_pdu_int(const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1221 | { |
ca1136c9 | 1222 | const __u64 *val = pdu_start(ent, has_cg); |
c71a8961 ACM |
1223 | return be64_to_cpu(*val); |
1224 | } | |
1225 | ||
1226 | static void get_pdu_remap(const struct trace_entry *ent, | |
ca1136c9 | 1227 | struct blk_io_trace_remap *r, bool has_cg) |
c71a8961 | 1228 | { |
ca1136c9 | 1229 | const struct blk_io_trace_remap *__r = pdu_start(ent, has_cg); |
a42aaa3b | 1230 | __u64 sector_from = __r->sector_from; |
c71a8961 | 1231 | |
c71a8961 | 1232 | r->device_from = be32_to_cpu(__r->device_from); |
a42aaa3b AB |
1233 | r->device_to = be32_to_cpu(__r->device_to); |
1234 | r->sector_from = be64_to_cpu(sector_from); | |
c71a8961 ACM |
1235 | } |
1236 | ||
ca1136c9 SL |
1237 | typedef void (blk_log_action_t) (struct trace_iterator *iter, const char *act, |
1238 | bool has_cg); | |
b6a4b0c3 | 1239 | |
ca1136c9 SL |
1240 | static void blk_log_action_classic(struct trace_iterator *iter, const char *act, |
1241 | bool has_cg) | |
c71a8961 | 1242 | { |
c09c47ca | 1243 | char rwbs[RWBS_LEN]; |
35ac51bf LZ |
1244 | unsigned long long ts = iter->ts; |
1245 | unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); | |
c71a8961 | 1246 | unsigned secs = (unsigned long)ts; |
b6a4b0c3 | 1247 | const struct blk_io_trace *t = te_blk_io_trace(iter->ent); |
c71a8961 ACM |
1248 | |
1249 | fill_rwbs(rwbs, t); | |
1250 | ||
f4a1d08c SRRH |
1251 | trace_seq_printf(&iter->seq, |
1252 | "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", | |
1253 | MAJOR(t->device), MINOR(t->device), iter->cpu, | |
1254 | secs, nsec_rem, iter->ent->pid, act, rwbs); | |
c71a8961 ACM |
1255 | } |
1256 | ||
ca1136c9 SL |
1257 | static void blk_log_action(struct trace_iterator *iter, const char *act, |
1258 | bool has_cg) | |
c71a8961 | 1259 | { |
c09c47ca | 1260 | char rwbs[RWBS_LEN]; |
b6a4b0c3 LZ |
1261 | const struct blk_io_trace *t = te_blk_io_trace(iter->ent); |
1262 | ||
c71a8961 | 1263 | fill_rwbs(rwbs, t); |
ca1136c9 SL |
1264 | if (has_cg) { |
1265 | const union kernfs_node_id *id = cgid_start(iter->ent); | |
1266 | ||
69fd5c39 SL |
1267 | if (blk_tracer_flags.val & TRACE_BLK_OPT_CGNAME) { |
1268 | char blkcg_name_buf[NAME_MAX + 1] = "<...>"; | |
1269 | ||
1270 | cgroup_path_from_kernfs_id(id, blkcg_name_buf, | |
1271 | sizeof(blkcg_name_buf)); | |
1272 | trace_seq_printf(&iter->seq, "%3d,%-3d %s %2s %3s ", | |
1273 | MAJOR(t->device), MINOR(t->device), | |
1274 | blkcg_name_buf, act, rwbs); | |
1275 | } else | |
1276 | trace_seq_printf(&iter->seq, | |
1277 | "%3d,%-3d %x,%-x %2s %3s ", | |
ca1136c9 SL |
1278 | MAJOR(t->device), MINOR(t->device), |
1279 | id->ino, id->generation, act, rwbs); | |
1280 | } else | |
1281 | trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", | |
1282 | MAJOR(t->device), MINOR(t->device), act, rwbs); | |
c71a8961 ACM |
1283 | } |
1284 | ||
ca1136c9 SL |
1285 | static void blk_log_dump_pdu(struct trace_seq *s, |
1286 | const struct trace_entry *ent, bool has_cg) | |
66de7792 | 1287 | { |
04986257 | 1288 | const unsigned char *pdu_buf; |
66de7792 | 1289 | int pdu_len; |
f4a1d08c | 1290 | int i, end; |
66de7792 | 1291 | |
ca1136c9 SL |
1292 | pdu_buf = pdu_start(ent, has_cg); |
1293 | pdu_len = pdu_real_len(ent, has_cg); | |
66de7792 LZ |
1294 | |
1295 | if (!pdu_len) | |
f4a1d08c | 1296 | return; |
66de7792 LZ |
1297 | |
1298 | /* find the last zero that needs to be printed */ | |
1299 | for (end = pdu_len - 1; end >= 0; end--) | |
1300 | if (pdu_buf[end]) | |
1301 | break; | |
1302 | end++; | |
1303 | ||
f4a1d08c | 1304 | trace_seq_putc(s, '('); |
66de7792 LZ |
1305 | |
1306 | for (i = 0; i < pdu_len; i++) { | |
1307 | ||
f4a1d08c SRRH |
1308 | trace_seq_printf(s, "%s%02x", |
1309 | i == 0 ? "" : " ", pdu_buf[i]); | |
66de7792 LZ |
1310 | |
1311 | /* | |
1312 | * stop when the rest is just zeroes and indicate so | |
1313 | * with a ".." appended | |
1314 | */ | |
f4a1d08c SRRH |
1315 | if (i == end && end != pdu_len - 1) { |
1316 | trace_seq_puts(s, " ..) "); | |
1317 | return; | |
1318 | } | |
66de7792 LZ |
1319 | } |
1320 | ||
f4a1d08c | 1321 | trace_seq_puts(s, ") "); |
66de7792 LZ |
1322 | } |
1323 | ||
ca1136c9 | 1324 | static void blk_log_generic(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1325 | { |
4ca53085 SR |
1326 | char cmd[TASK_COMM_LEN]; |
1327 | ||
1328 | trace_find_cmdline(ent->pid, cmd); | |
c71a8961 | 1329 | |
66de7792 | 1330 | if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { |
f4a1d08c | 1331 | trace_seq_printf(s, "%u ", t_bytes(ent)); |
ca1136c9 | 1332 | blk_log_dump_pdu(s, ent, has_cg); |
f4a1d08c | 1333 | trace_seq_printf(s, "[%s]\n", cmd); |
66de7792 LZ |
1334 | } else { |
1335 | if (t_sec(ent)) | |
f4a1d08c | 1336 | trace_seq_printf(s, "%llu + %u [%s]\n", |
66de7792 | 1337 | t_sector(ent), t_sec(ent), cmd); |
f4a1d08c SRRH |
1338 | else |
1339 | trace_seq_printf(s, "[%s]\n", cmd); | |
66de7792 | 1340 | } |
c71a8961 ACM |
1341 | } |
1342 | ||
f4a1d08c | 1343 | static void blk_log_with_error(struct trace_seq *s, |
ca1136c9 | 1344 | const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1345 | { |
66de7792 | 1346 | if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { |
ca1136c9 | 1347 | blk_log_dump_pdu(s, ent, has_cg); |
f4a1d08c | 1348 | trace_seq_printf(s, "[%d]\n", t_error(ent)); |
66de7792 LZ |
1349 | } else { |
1350 | if (t_sec(ent)) | |
f4a1d08c SRRH |
1351 | trace_seq_printf(s, "%llu + %u [%d]\n", |
1352 | t_sector(ent), | |
1353 | t_sec(ent), t_error(ent)); | |
1354 | else | |
1355 | trace_seq_printf(s, "%llu [%d]\n", | |
1356 | t_sector(ent), t_error(ent)); | |
66de7792 | 1357 | } |
c71a8961 ACM |
1358 | } |
1359 | ||
ca1136c9 | 1360 | static void blk_log_remap(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1361 | { |
a42aaa3b | 1362 | struct blk_io_trace_remap r = { .device_from = 0, }; |
c71a8961 | 1363 | |
ca1136c9 | 1364 | get_pdu_remap(ent, &r, has_cg); |
f4a1d08c SRRH |
1365 | trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", |
1366 | t_sector(ent), t_sec(ent), | |
1367 | MAJOR(r.device_from), MINOR(r.device_from), | |
1368 | (unsigned long long)r.sector_from); | |
c71a8961 ACM |
1369 | } |
1370 | ||
ca1136c9 | 1371 | static void blk_log_plug(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1372 | { |
4ca53085 SR |
1373 | char cmd[TASK_COMM_LEN]; |
1374 | ||
1375 | trace_find_cmdline(ent->pid, cmd); | |
1376 | ||
f4a1d08c | 1377 | trace_seq_printf(s, "[%s]\n", cmd); |
c71a8961 ACM |
1378 | } |
1379 | ||
ca1136c9 | 1380 | static void blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1381 | { |
4ca53085 SR |
1382 | char cmd[TASK_COMM_LEN]; |
1383 | ||
1384 | trace_find_cmdline(ent->pid, cmd); | |
1385 | ||
ca1136c9 | 1386 | trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent, has_cg)); |
c71a8961 ACM |
1387 | } |
1388 | ||
ca1136c9 | 1389 | static void blk_log_split(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1390 | { |
4ca53085 SR |
1391 | char cmd[TASK_COMM_LEN]; |
1392 | ||
1393 | trace_find_cmdline(ent->pid, cmd); | |
1394 | ||
f4a1d08c | 1395 | trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), |
ca1136c9 | 1396 | get_pdu_int(ent, has_cg), cmd); |
c71a8961 ACM |
1397 | } |
1398 | ||
ca1136c9 SL |
1399 | static void blk_log_msg(struct trace_seq *s, const struct trace_entry *ent, |
1400 | bool has_cg) | |
18cea459 | 1401 | { |
18cea459 | 1402 | |
ca1136c9 SL |
1403 | trace_seq_putmem(s, pdu_start(ent, has_cg), |
1404 | pdu_real_len(ent, has_cg)); | |
f4a1d08c | 1405 | trace_seq_putc(s, '\n'); |
18cea459 LZ |
1406 | } |
1407 | ||
c71a8961 ACM |
1408 | /* |
1409 | * struct tracer operations | |
1410 | */ | |
1411 | ||
1412 | static void blk_tracer_print_header(struct seq_file *m) | |
1413 | { | |
1414 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) | |
1415 | return; | |
1416 | seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" | |
1417 | "# | | | | | |\n"); | |
1418 | } | |
1419 | ||
1420 | static void blk_tracer_start(struct trace_array *tr) | |
1421 | { | |
ad5dd549 | 1422 | blk_tracer_enabled = true; |
c71a8961 ACM |
1423 | } |
1424 | ||
1425 | static int blk_tracer_init(struct trace_array *tr) | |
1426 | { | |
1427 | blk_tr = tr; | |
1428 | blk_tracer_start(tr); | |
c71a8961 ACM |
1429 | return 0; |
1430 | } | |
1431 | ||
1432 | static void blk_tracer_stop(struct trace_array *tr) | |
1433 | { | |
ad5dd549 | 1434 | blk_tracer_enabled = false; |
c71a8961 ACM |
1435 | } |
1436 | ||
1437 | static void blk_tracer_reset(struct trace_array *tr) | |
1438 | { | |
c71a8961 ACM |
1439 | blk_tracer_stop(tr); |
1440 | } | |
1441 | ||
e4955c99 | 1442 | static const struct { |
c71a8961 | 1443 | const char *act[2]; |
ca1136c9 SL |
1444 | void (*print)(struct trace_seq *s, const struct trace_entry *ent, |
1445 | bool has_cg); | |
e4955c99 | 1446 | } what2act[] = { |
ef18012b | 1447 | [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, |
c71a8961 ACM |
1448 | [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, |
1449 | [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, | |
1450 | [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, | |
1451 | [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, | |
1452 | [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, | |
1453 | [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, | |
1454 | [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, | |
1455 | [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, | |
1456 | [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, | |
49cac01e | 1457 | [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, |
c71a8961 ACM |
1458 | [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, |
1459 | [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, | |
1460 | [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, | |
1461 | [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, | |
1462 | }; | |
1463 | ||
b6a4b0c3 LZ |
1464 | static enum print_line_t print_one_line(struct trace_iterator *iter, |
1465 | bool classic) | |
c71a8961 | 1466 | { |
983f938a | 1467 | struct trace_array *tr = iter->tr; |
2c9b238e | 1468 | struct trace_seq *s = &iter->seq; |
b6a4b0c3 LZ |
1469 | const struct blk_io_trace *t; |
1470 | u16 what; | |
b6a4b0c3 LZ |
1471 | bool long_act; |
1472 | blk_log_action_t *log_action; | |
ca1136c9 | 1473 | bool has_cg; |
c71a8961 | 1474 | |
b6a4b0c3 | 1475 | t = te_blk_io_trace(iter->ent); |
ca1136c9 | 1476 | what = (t->action & ((1 << BLK_TC_SHIFT) - 1)) & ~__BLK_TA_CGROUP; |
983f938a | 1477 | long_act = !!(tr->trace_flags & TRACE_ITER_VERBOSE); |
b6a4b0c3 | 1478 | log_action = classic ? &blk_log_action_classic : &blk_log_action; |
ca1136c9 | 1479 | has_cg = t->action & __BLK_TA_CGROUP; |
08a06b83 | 1480 | |
ca1136c9 SL |
1481 | if ((t->action & ~__BLK_TN_CGROUP) == BLK_TN_MESSAGE) { |
1482 | log_action(iter, long_act ? "message" : "m", has_cg); | |
1483 | blk_log_msg(s, iter->ent, has_cg); | |
b7d7641e | 1484 | return trace_handle_return(s); |
18cea459 LZ |
1485 | } |
1486 | ||
eb08f8eb | 1487 | if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) |
f4a1d08c | 1488 | trace_seq_printf(s, "Unknown action %x\n", what); |
c71a8961 | 1489 | else { |
ca1136c9 SL |
1490 | log_action(iter, what2act[what].act[long_act], has_cg); |
1491 | what2act[what].print(s, iter->ent, has_cg); | |
c71a8961 | 1492 | } |
f4a1d08c SRRH |
1493 | |
1494 | return trace_handle_return(s); | |
c71a8961 ACM |
1495 | } |
1496 | ||
b6a4b0c3 | 1497 | static enum print_line_t blk_trace_event_print(struct trace_iterator *iter, |
a9a57763 | 1498 | int flags, struct trace_event *event) |
b6a4b0c3 | 1499 | { |
b6a4b0c3 LZ |
1500 | return print_one_line(iter, false); |
1501 | } | |
1502 | ||
f4a1d08c | 1503 | static void blk_trace_synthesize_old_trace(struct trace_iterator *iter) |
08a06b83 ACM |
1504 | { |
1505 | struct trace_seq *s = &iter->seq; | |
1506 | struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; | |
1507 | const int offset = offsetof(struct blk_io_trace, sector); | |
1508 | struct blk_io_trace old = { | |
1509 | .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, | |
6c051ce0 | 1510 | .time = iter->ts, |
08a06b83 ACM |
1511 | }; |
1512 | ||
f4a1d08c SRRH |
1513 | trace_seq_putmem(s, &old, offset); |
1514 | trace_seq_putmem(s, &t->sector, | |
1515 | sizeof(old) - offset + t->pdu_len); | |
08a06b83 ACM |
1516 | } |
1517 | ||
ae7462b4 | 1518 | static enum print_line_t |
a9a57763 SR |
1519 | blk_trace_event_print_binary(struct trace_iterator *iter, int flags, |
1520 | struct trace_event *event) | |
08a06b83 | 1521 | { |
f4a1d08c SRRH |
1522 | blk_trace_synthesize_old_trace(iter); |
1523 | ||
1524 | return trace_handle_return(&iter->seq); | |
08a06b83 ACM |
1525 | } |
1526 | ||
c71a8961 ACM |
1527 | static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) |
1528 | { | |
c71a8961 ACM |
1529 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) |
1530 | return TRACE_TYPE_UNHANDLED; | |
1531 | ||
b6a4b0c3 | 1532 | return print_one_line(iter, true); |
c71a8961 ACM |
1533 | } |
1534 | ||
8c1a49ae SRRH |
1535 | static int |
1536 | blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) | |
f3948f88 LZ |
1537 | { |
1538 | /* don't output context-info for blk_classic output */ | |
1539 | if (bit == TRACE_BLK_OPT_CLASSIC) { | |
1540 | if (set) | |
983f938a | 1541 | tr->trace_flags &= ~TRACE_ITER_CONTEXT_INFO; |
f3948f88 | 1542 | else |
983f938a | 1543 | tr->trace_flags |= TRACE_ITER_CONTEXT_INFO; |
f3948f88 LZ |
1544 | } |
1545 | return 0; | |
1546 | } | |
1547 | ||
c71a8961 ACM |
1548 | static struct tracer blk_tracer __read_mostly = { |
1549 | .name = "blk", | |
1550 | .init = blk_tracer_init, | |
1551 | .reset = blk_tracer_reset, | |
1552 | .start = blk_tracer_start, | |
1553 | .stop = blk_tracer_stop, | |
1554 | .print_header = blk_tracer_print_header, | |
1555 | .print_line = blk_tracer_print_line, | |
1556 | .flags = &blk_tracer_flags, | |
f3948f88 | 1557 | .set_flag = blk_tracer_set_flag, |
c71a8961 ACM |
1558 | }; |
1559 | ||
a9a57763 | 1560 | static struct trace_event_functions trace_blk_event_funcs = { |
c71a8961 | 1561 | .trace = blk_trace_event_print, |
08a06b83 | 1562 | .binary = blk_trace_event_print_binary, |
c71a8961 ACM |
1563 | }; |
1564 | ||
a9a57763 SR |
1565 | static struct trace_event trace_blk_event = { |
1566 | .type = TRACE_BLK, | |
1567 | .funcs = &trace_blk_event_funcs, | |
1568 | }; | |
1569 | ||
c71a8961 ACM |
1570 | static int __init init_blk_tracer(void) |
1571 | { | |
9023c930 | 1572 | if (!register_trace_event(&trace_blk_event)) { |
a395d6a7 | 1573 | pr_warn("Warning: could not register block events\n"); |
c71a8961 ACM |
1574 | return 1; |
1575 | } | |
1576 | ||
1577 | if (register_tracer(&blk_tracer) != 0) { | |
a395d6a7 | 1578 | pr_warn("Warning: could not register the block tracer\n"); |
9023c930 | 1579 | unregister_trace_event(&trace_blk_event); |
c71a8961 ACM |
1580 | return 1; |
1581 | } | |
1582 | ||
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | device_initcall(init_blk_tracer); | |
1587 | ||
1588 | static int blk_trace_remove_queue(struct request_queue *q) | |
1589 | { | |
1590 | struct blk_trace *bt; | |
1591 | ||
1592 | bt = xchg(&q->blk_trace, NULL); | |
1593 | if (bt == NULL) | |
1594 | return -EINVAL; | |
1595 | ||
a6da0024 | 1596 | put_probe_ref(); |
ad5dd549 | 1597 | blk_trace_free(bt); |
c71a8961 ACM |
1598 | return 0; |
1599 | } | |
1600 | ||
1601 | /* | |
1602 | * Setup everything required to start tracing | |
1603 | */ | |
9908c309 LZ |
1604 | static int blk_trace_setup_queue(struct request_queue *q, |
1605 | struct block_device *bdev) | |
c71a8961 | 1606 | { |
cdea01b2 | 1607 | struct blk_trace *bt = NULL; |
18cea459 | 1608 | int ret = -ENOMEM; |
c71a8961 | 1609 | |
c71a8961 ACM |
1610 | bt = kzalloc(sizeof(*bt), GFP_KERNEL); |
1611 | if (!bt) | |
15152e44 | 1612 | return -ENOMEM; |
c71a8961 | 1613 | |
18cea459 LZ |
1614 | bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); |
1615 | if (!bt->msg_data) | |
1616 | goto free_bt; | |
1617 | ||
9908c309 | 1618 | bt->dev = bdev->bd_dev; |
c71a8961 | 1619 | bt->act_mask = (u16)-1; |
9908c309 LZ |
1620 | |
1621 | blk_trace_setup_lba(bt, bdev); | |
c71a8961 | 1622 | |
cdea01b2 DB |
1623 | ret = -EBUSY; |
1624 | if (cmpxchg(&q->blk_trace, NULL, bt)) | |
18cea459 | 1625 | goto free_bt; |
15152e44 | 1626 | |
a6da0024 | 1627 | get_probe_ref(); |
c71a8961 | 1628 | return 0; |
18cea459 LZ |
1629 | |
1630 | free_bt: | |
1631 | blk_trace_free(bt); | |
1632 | return ret; | |
c71a8961 ACM |
1633 | } |
1634 | ||
1635 | /* | |
1636 | * sysfs interface to enable and configure tracing | |
1637 | */ | |
1638 | ||
c71a8961 ACM |
1639 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, |
1640 | struct device_attribute *attr, | |
1641 | char *buf); | |
1642 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | |
1643 | struct device_attribute *attr, | |
1644 | const char *buf, size_t count); | |
1645 | #define BLK_TRACE_DEVICE_ATTR(_name) \ | |
1646 | DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ | |
1647 | sysfs_blk_trace_attr_show, \ | |
1648 | sysfs_blk_trace_attr_store) | |
1649 | ||
cd649b8b | 1650 | static BLK_TRACE_DEVICE_ATTR(enable); |
c71a8961 ACM |
1651 | static BLK_TRACE_DEVICE_ATTR(act_mask); |
1652 | static BLK_TRACE_DEVICE_ATTR(pid); | |
1653 | static BLK_TRACE_DEVICE_ATTR(start_lba); | |
1654 | static BLK_TRACE_DEVICE_ATTR(end_lba); | |
1655 | ||
1656 | static struct attribute *blk_trace_attrs[] = { | |
1657 | &dev_attr_enable.attr, | |
1658 | &dev_attr_act_mask.attr, | |
1659 | &dev_attr_pid.attr, | |
1660 | &dev_attr_start_lba.attr, | |
1661 | &dev_attr_end_lba.attr, | |
1662 | NULL | |
1663 | }; | |
1664 | ||
1665 | struct attribute_group blk_trace_attr_group = { | |
1666 | .name = "trace", | |
1667 | .attrs = blk_trace_attrs, | |
1668 | }; | |
1669 | ||
09341997 LZ |
1670 | static const struct { |
1671 | int mask; | |
1672 | const char *str; | |
1673 | } mask_maps[] = { | |
1674 | { BLK_TC_READ, "read" }, | |
1675 | { BLK_TC_WRITE, "write" }, | |
c09c47ca | 1676 | { BLK_TC_FLUSH, "flush" }, |
09341997 LZ |
1677 | { BLK_TC_SYNC, "sync" }, |
1678 | { BLK_TC_QUEUE, "queue" }, | |
1679 | { BLK_TC_REQUEUE, "requeue" }, | |
1680 | { BLK_TC_ISSUE, "issue" }, | |
1681 | { BLK_TC_COMPLETE, "complete" }, | |
1682 | { BLK_TC_FS, "fs" }, | |
1683 | { BLK_TC_PC, "pc" }, | |
8d1547e0 | 1684 | { BLK_TC_NOTIFY, "notify" }, |
09341997 LZ |
1685 | { BLK_TC_AHEAD, "ahead" }, |
1686 | { BLK_TC_META, "meta" }, | |
1687 | { BLK_TC_DISCARD, "discard" }, | |
1688 | { BLK_TC_DRV_DATA, "drv_data" }, | |
c09c47ca | 1689 | { BLK_TC_FUA, "fua" }, |
09341997 LZ |
1690 | }; |
1691 | ||
1692 | static int blk_trace_str2mask(const char *str) | |
c71a8961 | 1693 | { |
09341997 | 1694 | int i; |
c71a8961 | 1695 | int mask = 0; |
9eb85125 | 1696 | char *buf, *s, *token; |
c71a8961 | 1697 | |
9eb85125 LZ |
1698 | buf = kstrdup(str, GFP_KERNEL); |
1699 | if (buf == NULL) | |
c71a8961 | 1700 | return -ENOMEM; |
9eb85125 | 1701 | s = strstrip(buf); |
c71a8961 ACM |
1702 | |
1703 | while (1) { | |
09341997 LZ |
1704 | token = strsep(&s, ","); |
1705 | if (token == NULL) | |
c71a8961 ACM |
1706 | break; |
1707 | ||
09341997 LZ |
1708 | if (*token == '\0') |
1709 | continue; | |
1710 | ||
1711 | for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { | |
1712 | if (strcasecmp(token, mask_maps[i].str) == 0) { | |
1713 | mask |= mask_maps[i].mask; | |
1714 | break; | |
1715 | } | |
1716 | } | |
1717 | if (i == ARRAY_SIZE(mask_maps)) { | |
1718 | mask = -EINVAL; | |
1719 | break; | |
1720 | } | |
c71a8961 | 1721 | } |
9eb85125 | 1722 | kfree(buf); |
c71a8961 ACM |
1723 | |
1724 | return mask; | |
1725 | } | |
1726 | ||
09341997 LZ |
1727 | static ssize_t blk_trace_mask2str(char *buf, int mask) |
1728 | { | |
1729 | int i; | |
1730 | char *p = buf; | |
1731 | ||
1732 | for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { | |
1733 | if (mask & mask_maps[i].mask) { | |
1734 | p += sprintf(p, "%s%s", | |
1735 | (p == buf) ? "" : ",", mask_maps[i].str); | |
1736 | } | |
1737 | } | |
1738 | *p++ = '\n'; | |
1739 | ||
1740 | return p - buf; | |
1741 | } | |
1742 | ||
b125130b LZ |
1743 | static struct request_queue *blk_trace_get_queue(struct block_device *bdev) |
1744 | { | |
1745 | if (bdev->bd_disk == NULL) | |
1746 | return NULL; | |
1747 | ||
1748 | return bdev_get_queue(bdev); | |
1749 | } | |
1750 | ||
c71a8961 ACM |
1751 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, |
1752 | struct device_attribute *attr, | |
1753 | char *buf) | |
1754 | { | |
1755 | struct hd_struct *p = dev_to_part(dev); | |
1756 | struct request_queue *q; | |
1757 | struct block_device *bdev; | |
1758 | ssize_t ret = -ENXIO; | |
1759 | ||
c71a8961 ACM |
1760 | bdev = bdget(part_devt(p)); |
1761 | if (bdev == NULL) | |
01b284f9 | 1762 | goto out; |
c71a8961 | 1763 | |
b125130b | 1764 | q = blk_trace_get_queue(bdev); |
c71a8961 ACM |
1765 | if (q == NULL) |
1766 | goto out_bdput; | |
b125130b | 1767 | |
5acb3cc2 | 1768 | mutex_lock(&q->blk_trace_mutex); |
cd649b8b LZ |
1769 | |
1770 | if (attr == &dev_attr_enable) { | |
1771 | ret = sprintf(buf, "%u\n", !!q->blk_trace); | |
1772 | goto out_unlock_bdev; | |
1773 | } | |
1774 | ||
c71a8961 ACM |
1775 | if (q->blk_trace == NULL) |
1776 | ret = sprintf(buf, "disabled\n"); | |
1777 | else if (attr == &dev_attr_act_mask) | |
09341997 | 1778 | ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); |
c71a8961 ACM |
1779 | else if (attr == &dev_attr_pid) |
1780 | ret = sprintf(buf, "%u\n", q->blk_trace->pid); | |
1781 | else if (attr == &dev_attr_start_lba) | |
1782 | ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); | |
1783 | else if (attr == &dev_attr_end_lba) | |
1784 | ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); | |
cd649b8b LZ |
1785 | |
1786 | out_unlock_bdev: | |
5acb3cc2 | 1787 | mutex_unlock(&q->blk_trace_mutex); |
c71a8961 ACM |
1788 | out_bdput: |
1789 | bdput(bdev); | |
01b284f9 | 1790 | out: |
c71a8961 ACM |
1791 | return ret; |
1792 | } | |
1793 | ||
1794 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | |
1795 | struct device_attribute *attr, | |
1796 | const char *buf, size_t count) | |
1797 | { | |
1798 | struct block_device *bdev; | |
1799 | struct request_queue *q; | |
1800 | struct hd_struct *p; | |
1801 | u64 value; | |
09341997 | 1802 | ssize_t ret = -EINVAL; |
c71a8961 ACM |
1803 | |
1804 | if (count == 0) | |
1805 | goto out; | |
1806 | ||
1807 | if (attr == &dev_attr_act_mask) { | |
5f339453 | 1808 | if (kstrtoull(buf, 0, &value)) { |
c71a8961 | 1809 | /* Assume it is a list of trace category names */ |
09341997 LZ |
1810 | ret = blk_trace_str2mask(buf); |
1811 | if (ret < 0) | |
c71a8961 | 1812 | goto out; |
09341997 | 1813 | value = ret; |
c71a8961 | 1814 | } |
5f339453 | 1815 | } else if (kstrtoull(buf, 0, &value)) |
c71a8961 ACM |
1816 | goto out; |
1817 | ||
09341997 LZ |
1818 | ret = -ENXIO; |
1819 | ||
c71a8961 ACM |
1820 | p = dev_to_part(dev); |
1821 | bdev = bdget(part_devt(p)); | |
1822 | if (bdev == NULL) | |
01b284f9 | 1823 | goto out; |
c71a8961 | 1824 | |
b125130b | 1825 | q = blk_trace_get_queue(bdev); |
c71a8961 ACM |
1826 | if (q == NULL) |
1827 | goto out_bdput; | |
1828 | ||
5acb3cc2 | 1829 | mutex_lock(&q->blk_trace_mutex); |
cd649b8b LZ |
1830 | |
1831 | if (attr == &dev_attr_enable) { | |
1832 | if (value) | |
9908c309 | 1833 | ret = blk_trace_setup_queue(q, bdev); |
cd649b8b LZ |
1834 | else |
1835 | ret = blk_trace_remove_queue(q); | |
1836 | goto out_unlock_bdev; | |
1837 | } | |
1838 | ||
c71a8961 ACM |
1839 | ret = 0; |
1840 | if (q->blk_trace == NULL) | |
9908c309 | 1841 | ret = blk_trace_setup_queue(q, bdev); |
c71a8961 ACM |
1842 | |
1843 | if (ret == 0) { | |
1844 | if (attr == &dev_attr_act_mask) | |
1845 | q->blk_trace->act_mask = value; | |
1846 | else if (attr == &dev_attr_pid) | |
1847 | q->blk_trace->pid = value; | |
1848 | else if (attr == &dev_attr_start_lba) | |
1849 | q->blk_trace->start_lba = value; | |
1850 | else if (attr == &dev_attr_end_lba) | |
1851 | q->blk_trace->end_lba = value; | |
c71a8961 | 1852 | } |
cd649b8b LZ |
1853 | |
1854 | out_unlock_bdev: | |
5acb3cc2 | 1855 | mutex_unlock(&q->blk_trace_mutex); |
c71a8961 ACM |
1856 | out_bdput: |
1857 | bdput(bdev); | |
c71a8961 | 1858 | out: |
cd649b8b | 1859 | return ret ? ret : count; |
c71a8961 | 1860 | } |
cd649b8b | 1861 | |
1d54ad6d LZ |
1862 | int blk_trace_init_sysfs(struct device *dev) |
1863 | { | |
1864 | return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); | |
1865 | } | |
1866 | ||
48c0d4d4 ZK |
1867 | void blk_trace_remove_sysfs(struct device *dev) |
1868 | { | |
1869 | sysfs_remove_group(&dev->kobj, &blk_trace_attr_group); | |
1870 | } | |
1871 | ||
55782138 LZ |
1872 | #endif /* CONFIG_BLK_DEV_IO_TRACE */ |
1873 | ||
1874 | #ifdef CONFIG_EVENT_TRACING | |
1875 | ||
ef295ecf | 1876 | void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes) |
55782138 LZ |
1877 | { |
1878 | int i = 0; | |
1879 | ||
ef295ecf | 1880 | if (op & REQ_PREFLUSH) |
c09c47ca NK |
1881 | rwbs[i++] = 'F'; |
1882 | ||
ef295ecf | 1883 | switch (op & REQ_OP_MASK) { |
1b9a9ab7 MC |
1884 | case REQ_OP_WRITE: |
1885 | case REQ_OP_WRITE_SAME: | |
55782138 | 1886 | rwbs[i++] = 'W'; |
1b9a9ab7 MC |
1887 | break; |
1888 | case REQ_OP_DISCARD: | |
55782138 | 1889 | rwbs[i++] = 'D'; |
1b9a9ab7 | 1890 | break; |
288dab8a CH |
1891 | case REQ_OP_SECURE_ERASE: |
1892 | rwbs[i++] = 'D'; | |
1893 | rwbs[i++] = 'E'; | |
1894 | break; | |
3a5e02ce MC |
1895 | case REQ_OP_FLUSH: |
1896 | rwbs[i++] = 'F'; | |
1897 | break; | |
1b9a9ab7 | 1898 | case REQ_OP_READ: |
55782138 | 1899 | rwbs[i++] = 'R'; |
1b9a9ab7 MC |
1900 | break; |
1901 | default: | |
55782138 | 1902 | rwbs[i++] = 'N'; |
1b9a9ab7 | 1903 | } |
55782138 | 1904 | |
ef295ecf | 1905 | if (op & REQ_FUA) |
c09c47ca | 1906 | rwbs[i++] = 'F'; |
ef295ecf | 1907 | if (op & REQ_RAHEAD) |
55782138 | 1908 | rwbs[i++] = 'A'; |
ef295ecf | 1909 | if (op & REQ_SYNC) |
55782138 | 1910 | rwbs[i++] = 'S'; |
ef295ecf | 1911 | if (op & REQ_META) |
55782138 LZ |
1912 | rwbs[i++] = 'M'; |
1913 | ||
1914 | rwbs[i] = '\0'; | |
1915 | } | |
9ca8f8e5 | 1916 | EXPORT_SYMBOL_GPL(blk_fill_rwbs); |
55782138 | 1917 | |
55782138 LZ |
1918 | #endif /* CONFIG_EVENT_TRACING */ |
1919 |