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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 | 36 | static LIST_HEAD(running_trace_list); |
361c81db | 37 | static __cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(running_trace_lock); |
a404d557 | 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; |
36590c50 | 75 | unsigned int trace_ctx = 0; |
18cea459 LZ |
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; |
36590c50 | 82 | trace_ctx = tracing_gen_ctx_flags(0); |
e77405ad | 83 | event = trace_buffer_lock_reserve(buffer, TRACE_BLK, |
ca1136c9 | 84 | sizeof(*t) + len + cgid_len, |
36590c50 | 85 | trace_ctx); |
18cea459 LZ |
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) | |
36590c50 | 110 | trace_buffer_unlock_commit(blk_tr, buffer, event, trace_ctx); |
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; |
361c81db | 124 | raw_spin_lock_irqsave(&running_trace_lock, flags); |
a404d557 JK |
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 | 128 | } |
361c81db | 129 | raw_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 | ||
f4a6a61c CH |
148 | void __blk_trace_note_message(struct blk_trace *bt, |
149 | struct cgroup_subsys_state *css, const char *fmt, ...) | |
9d5f09a4 AB |
150 | { |
151 | int n; | |
152 | va_list args; | |
14a73f54 | 153 | unsigned long flags; |
64565911 | 154 | char *buf; |
f4a6a61c | 155 | u64 cgid = 0; |
9d5f09a4 | 156 | |
18cea459 LZ |
157 | if (unlikely(bt->trace_state != Blktrace_running && |
158 | !blk_tracer_enabled)) | |
c71a8961 ACM |
159 | return; |
160 | ||
490da40d TM |
161 | /* |
162 | * If the BLK_TC_NOTIFY action mask isn't set, don't send any note | |
163 | * message to the trace. | |
164 | */ | |
165 | if (!(bt->act_mask & BLK_TC_NOTIFY)) | |
166 | return; | |
167 | ||
14a73f54 | 168 | local_irq_save(flags); |
d8a0349c | 169 | buf = this_cpu_ptr(bt->msg_data); |
9d5f09a4 | 170 | va_start(args, fmt); |
64565911 | 171 | n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); |
9d5f09a4 AB |
172 | va_end(args); |
173 | ||
35fe6d76 | 174 | #ifdef CONFIG_BLK_CGROUP |
f4a6a61c CH |
175 | if (css && (blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP)) |
176 | cgid = cgroup_id(css->cgroup); | |
177 | else | |
178 | cgid = 1; | |
35fe6d76 | 179 | #endif |
f4a6a61c | 180 | trace_note(bt, current->pid, BLK_TN_MESSAGE, buf, n, cgid); |
14a73f54 | 181 | local_irq_restore(flags); |
9d5f09a4 | 182 | } |
f4a6a61c | 183 | EXPORT_SYMBOL_GPL(__blk_trace_note_message); |
9d5f09a4 | 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 */ |
919dbca8 | 208 | #define MASK_TC_BIT(rw, __name) ((__force u32)(rw & REQ_ ## __name) << \ |
7b6d91da | 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, |
919dbca8 BVA |
216 | const blk_opf_t opf, u32 what, int error, |
217 | int pdu_len, 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 | 224 | unsigned long *sequence; |
36590c50 | 225 | unsigned int trace_ctx = 0; |
2056a782 | 226 | pid_t pid; |
36590c50 | 227 | int cpu; |
18cea459 | 228 | bool blk_tracer = blk_tracer_enabled; |
67c0496e | 229 | ssize_t cgid_len = cgid ? sizeof(cgid) : 0; |
919dbca8 | 230 | const enum req_op op = opf & REQ_OP_MASK; |
2056a782 | 231 | |
18cea459 | 232 | if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) |
2056a782 JA |
233 | return; |
234 | ||
1b9a9ab7 | 235 | what |= ddir_act[op_is_write(op) ? WRITE : READ]; |
919dbca8 BVA |
236 | what |= MASK_TC_BIT(opf, SYNC); |
237 | what |= MASK_TC_BIT(opf, RAHEAD); | |
238 | what |= MASK_TC_BIT(opf, META); | |
239 | what |= MASK_TC_BIT(opf, PREFLUSH); | |
240 | what |= MASK_TC_BIT(opf, FUA); | |
7afafc8a | 241 | if (op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE) |
1b9a9ab7 | 242 | what |= BLK_TC_ACT(BLK_TC_DISCARD); |
3a5e02ce MC |
243 | if (op == REQ_OP_FLUSH) |
244 | what |= BLK_TC_ACT(BLK_TC_FLUSH); | |
ca1136c9 SL |
245 | if (cgid) |
246 | what |= __BLK_TA_CGROUP; | |
2056a782 JA |
247 | |
248 | pid = tsk->pid; | |
d0deef5b | 249 | if (act_log_check(bt, what, sector, pid)) |
2056a782 | 250 | return; |
c71a8961 ACM |
251 | cpu = raw_smp_processor_id(); |
252 | ||
18cea459 | 253 | if (blk_tracer) { |
c71a8961 ACM |
254 | tracing_record_cmdline(current); |
255 | ||
1c5eb448 | 256 | buffer = blk_tr->array_buffer.buffer; |
36590c50 | 257 | trace_ctx = tracing_gen_ctx_flags(0); |
e77405ad | 258 | event = trace_buffer_lock_reserve(buffer, TRACE_BLK, |
ca1136c9 | 259 | sizeof(*t) + pdu_len + cgid_len, |
36590c50 | 260 | trace_ctx); |
c71a8961 ACM |
261 | if (!event) |
262 | return; | |
51a763dd | 263 | t = ring_buffer_event_data(event); |
c71a8961 ACM |
264 | goto record_it; |
265 | } | |
2056a782 | 266 | |
a404d557 JK |
267 | if (unlikely(tsk->btrace_seq != blktrace_seq)) |
268 | trace_note_tsk(tsk); | |
269 | ||
2056a782 JA |
270 | /* |
271 | * A word about the locking here - we disable interrupts to reserve | |
272 | * some space in the relay per-cpu buffer, to prevent an irq | |
14a73f54 | 273 | * from coming in and stepping on our toes. |
2056a782 JA |
274 | */ |
275 | local_irq_save(flags); | |
ca1136c9 | 276 | t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len + cgid_len); |
2056a782 | 277 | if (t) { |
2056a782 JA |
278 | sequence = per_cpu_ptr(bt->sequence, cpu); |
279 | ||
280 | t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; | |
281 | t->sequence = ++(*sequence); | |
2997c8c4 | 282 | t->time = ktime_to_ns(ktime_get()); |
c71a8961 | 283 | record_it: |
08a06b83 | 284 | /* |
939b3669 ACM |
285 | * These two are not needed in ftrace as they are in the |
286 | * generic trace_entry, filled by tracing_generic_entry_update, | |
287 | * but for the trace_event->bin() synthesizer benefit we do it | |
288 | * here too. | |
289 | */ | |
290 | t->cpu = cpu; | |
291 | t->pid = pid; | |
08a06b83 | 292 | |
2056a782 JA |
293 | t->sector = sector; |
294 | t->bytes = bytes; | |
295 | t->action = what; | |
2056a782 | 296 | t->device = bt->dev; |
2056a782 | 297 | t->error = error; |
ca1136c9 | 298 | t->pdu_len = pdu_len + cgid_len; |
2056a782 | 299 | |
ca1136c9 | 300 | if (cgid_len) |
67c0496e | 301 | memcpy((void *)t + sizeof(*t), &cgid, cgid_len); |
2056a782 | 302 | if (pdu_len) |
ca1136c9 | 303 | memcpy((void *)t + sizeof(*t) + cgid_len, pdu_data, pdu_len); |
c71a8961 | 304 | |
18cea459 | 305 | if (blk_tracer) { |
36590c50 | 306 | trace_buffer_unlock_commit(blk_tr, buffer, event, trace_ctx); |
c71a8961 ACM |
307 | return; |
308 | } | |
2056a782 JA |
309 | } |
310 | ||
311 | local_irq_restore(flags); | |
312 | } | |
313 | ||
30939293 | 314 | static void blk_trace_free(struct request_queue *q, struct blk_trace *bt) |
2056a782 | 315 | { |
f48fc4d3 | 316 | relay_close(bt->rchan); |
30939293 YK |
317 | |
318 | /* | |
319 | * If 'bt->dir' is not set, then both 'dropped' and 'msg' are created | |
320 | * under 'q->debugfs_dir', thus lookup and remove them. | |
321 | */ | |
322 | if (!bt->dir) { | |
83e8864f GKH |
323 | debugfs_lookup_and_remove("dropped", q->debugfs_dir); |
324 | debugfs_lookup_and_remove("msg", q->debugfs_dir); | |
30939293 YK |
325 | } else { |
326 | debugfs_remove(bt->dir); | |
327 | } | |
2056a782 | 328 | free_percpu(bt->sequence); |
64565911 | 329 | free_percpu(bt->msg_data); |
2056a782 | 330 | kfree(bt); |
ad5dd549 LZ |
331 | } |
332 | ||
a6da0024 JA |
333 | static void get_probe_ref(void) |
334 | { | |
335 | mutex_lock(&blk_probe_mutex); | |
336 | if (++blk_probes_ref == 1) | |
337 | blk_register_tracepoints(); | |
338 | mutex_unlock(&blk_probe_mutex); | |
339 | } | |
340 | ||
341 | static void put_probe_ref(void) | |
342 | { | |
343 | mutex_lock(&blk_probe_mutex); | |
344 | if (!--blk_probes_ref) | |
345 | blk_unregister_tracepoints(); | |
346 | mutex_unlock(&blk_probe_mutex); | |
347 | } | |
348 | ||
60a9bb90 YB |
349 | static int blk_trace_start(struct blk_trace *bt) |
350 | { | |
351 | if (bt->trace_state != Blktrace_setup && | |
352 | bt->trace_state != Blktrace_stopped) | |
353 | return -EINVAL; | |
354 | ||
355 | blktrace_seq++; | |
356 | smp_mb(); | |
357 | bt->trace_state = Blktrace_running; | |
358 | raw_spin_lock_irq(&running_trace_lock); | |
359 | list_add(&bt->running_list, &running_trace_list); | |
360 | raw_spin_unlock_irq(&running_trace_lock); | |
361 | trace_note_time(bt); | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | static int blk_trace_stop(struct blk_trace *bt) | |
367 | { | |
368 | if (bt->trace_state != Blktrace_running) | |
369 | return -EINVAL; | |
370 | ||
371 | bt->trace_state = Blktrace_stopped; | |
372 | raw_spin_lock_irq(&running_trace_lock); | |
373 | list_del_init(&bt->running_list); | |
374 | raw_spin_unlock_irq(&running_trace_lock); | |
375 | relay_flush(bt->rchan); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
30939293 | 380 | static void blk_trace_cleanup(struct request_queue *q, struct blk_trace *bt) |
ad5dd549 | 381 | { |
dcd1a59c | 382 | blk_trace_stop(bt); |
c780e86d | 383 | synchronize_rcu(); |
30939293 | 384 | blk_trace_free(q, bt); |
a6da0024 | 385 | put_probe_ref(); |
2056a782 JA |
386 | } |
387 | ||
1f2cac10 | 388 | static int __blk_trace_remove(struct request_queue *q) |
2056a782 JA |
389 | { |
390 | struct blk_trace *bt; | |
391 | ||
c3dbe541 | 392 | bt = rcu_replace_pointer(q->blk_trace, NULL, |
85e0cbbb | 393 | lockdep_is_held(&q->debugfs_mutex)); |
2056a782 JA |
394 | if (!bt) |
395 | return -EINVAL; | |
396 | ||
dcd1a59c | 397 | blk_trace_cleanup(q, bt); |
2056a782 JA |
398 | |
399 | return 0; | |
400 | } | |
1f2cac10 JA |
401 | |
402 | int blk_trace_remove(struct request_queue *q) | |
403 | { | |
404 | int ret; | |
405 | ||
85e0cbbb | 406 | mutex_lock(&q->debugfs_mutex); |
1f2cac10 | 407 | ret = __blk_trace_remove(q); |
85e0cbbb | 408 | mutex_unlock(&q->debugfs_mutex); |
1f2cac10 JA |
409 | |
410 | return ret; | |
411 | } | |
6da127ad | 412 | EXPORT_SYMBOL_GPL(blk_trace_remove); |
2056a782 | 413 | |
2056a782 JA |
414 | static ssize_t blk_dropped_read(struct file *filp, char __user *buffer, |
415 | size_t count, loff_t *ppos) | |
416 | { | |
417 | struct blk_trace *bt = filp->private_data; | |
418 | char buf[16]; | |
419 | ||
420 | snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); | |
421 | ||
422 | return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); | |
423 | } | |
424 | ||
2b8693c0 | 425 | static const struct file_operations blk_dropped_fops = { |
2056a782 | 426 | .owner = THIS_MODULE, |
234e3405 | 427 | .open = simple_open, |
2056a782 | 428 | .read = blk_dropped_read, |
6038f373 | 429 | .llseek = default_llseek, |
2056a782 JA |
430 | }; |
431 | ||
02c62304 AB |
432 | static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, |
433 | size_t count, loff_t *ppos) | |
434 | { | |
435 | char *msg; | |
436 | struct blk_trace *bt; | |
437 | ||
7635b03a | 438 | if (count >= BLK_TN_MAX_MSG) |
02c62304 AB |
439 | return -EINVAL; |
440 | ||
16e5c1fc AV |
441 | msg = memdup_user_nul(buffer, count); |
442 | if (IS_ERR(msg)) | |
443 | return PTR_ERR(msg); | |
02c62304 | 444 | |
02c62304 | 445 | bt = filp->private_data; |
f4a6a61c | 446 | __blk_trace_note_message(bt, NULL, "%s", msg); |
02c62304 AB |
447 | kfree(msg); |
448 | ||
449 | return count; | |
450 | } | |
451 | ||
452 | static const struct file_operations blk_msg_fops = { | |
453 | .owner = THIS_MODULE, | |
234e3405 | 454 | .open = simple_open, |
02c62304 | 455 | .write = blk_msg_write, |
6038f373 | 456 | .llseek = noop_llseek, |
02c62304 AB |
457 | }; |
458 | ||
2056a782 JA |
459 | /* |
460 | * Keep track of how many times we encountered a full subbuffer, to aid | |
461 | * the user space app in telling how many lost events there were. | |
462 | */ | |
463 | static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, | |
464 | void *prev_subbuf, size_t prev_padding) | |
465 | { | |
466 | struct blk_trace *bt; | |
467 | ||
468 | if (!relay_buf_full(buf)) | |
469 | return 1; | |
470 | ||
471 | bt = buf->chan->private_data; | |
472 | atomic_inc(&bt->dropped); | |
473 | return 0; | |
474 | } | |
475 | ||
476 | static int blk_remove_buf_file_callback(struct dentry *dentry) | |
477 | { | |
478 | debugfs_remove(dentry); | |
f48fc4d3 | 479 | |
2056a782 JA |
480 | return 0; |
481 | } | |
482 | ||
483 | static struct dentry *blk_create_buf_file_callback(const char *filename, | |
484 | struct dentry *parent, | |
f4ae40a6 | 485 | umode_t mode, |
2056a782 JA |
486 | struct rchan_buf *buf, |
487 | int *is_global) | |
488 | { | |
489 | return debugfs_create_file(filename, mode, parent, buf, | |
490 | &relay_file_operations); | |
491 | } | |
492 | ||
abf4e00c | 493 | static const struct rchan_callbacks blk_relay_callbacks = { |
2056a782 JA |
494 | .subbuf_start = blk_subbuf_start_callback, |
495 | .create_buf_file = blk_create_buf_file_callback, | |
496 | .remove_buf_file = blk_remove_buf_file_callback, | |
497 | }; | |
498 | ||
9908c309 LZ |
499 | static void blk_trace_setup_lba(struct blk_trace *bt, |
500 | struct block_device *bdev) | |
501 | { | |
29ff57c6 CH |
502 | if (bdev) { |
503 | bt->start_lba = bdev->bd_start_sect; | |
504 | bt->end_lba = bdev->bd_start_sect + bdev_nr_sectors(bdev); | |
9908c309 LZ |
505 | } else { |
506 | bt->start_lba = 0; | |
507 | bt->end_lba = -1ULL; | |
508 | } | |
509 | } | |
510 | ||
2056a782 JA |
511 | /* |
512 | * Setup everything required to start tracing | |
513 | */ | |
a428d314 OS |
514 | static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
515 | struct block_device *bdev, | |
516 | struct blk_user_trace_setup *buts) | |
2056a782 | 517 | { |
cdea01b2 | 518 | struct blk_trace *bt = NULL; |
2056a782 | 519 | struct dentry *dir = NULL; |
ff14417c | 520 | int ret; |
2056a782 | 521 | |
85e0cbbb | 522 | lockdep_assert_held(&q->debugfs_mutex); |
a67549c8 | 523 | |
171044d4 | 524 | if (!buts->buf_size || !buts->buf_nr) |
2056a782 JA |
525 | return -EINVAL; |
526 | ||
051e7503 | 527 | strscpy_pad(buts->name, name, BLKTRACE_BDEV_SIZE); |
2056a782 JA |
528 | |
529 | /* | |
530 | * some device names have larger paths - convert the slashes | |
531 | * to underscores for this to work as expected | |
532 | */ | |
ff14417c | 533 | strreplace(buts->name, '/', '_'); |
2056a782 | 534 | |
1b0b2836 LC |
535 | /* |
536 | * bdev can be NULL, as with scsi-generic, this is a helpful as | |
537 | * we can be. | |
538 | */ | |
c3dbe541 | 539 | if (rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 540 | lockdep_is_held(&q->debugfs_mutex))) { |
1b0b2836 LC |
541 | pr_warn("Concurrent blktraces are not allowed on %s\n", |
542 | buts->name); | |
543 | return -EBUSY; | |
544 | } | |
545 | ||
2056a782 JA |
546 | bt = kzalloc(sizeof(*bt), GFP_KERNEL); |
547 | if (!bt) | |
ad5dd549 | 548 | return -ENOMEM; |
2056a782 | 549 | |
ad5dd549 | 550 | ret = -ENOMEM; |
2056a782 JA |
551 | bt->sequence = alloc_percpu(unsigned long); |
552 | if (!bt->sequence) | |
553 | goto err; | |
554 | ||
313e458f | 555 | bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); |
64565911 JA |
556 | if (!bt->msg_data) |
557 | goto err; | |
558 | ||
bad8e64f | 559 | /* |
85e0cbbb LC |
560 | * When tracing the whole disk reuse the existing debugfs directory |
561 | * created by the block layer on init. For partitions block devices, | |
bad8e64f LC |
562 | * and scsi-generic block devices we create a temporary new debugfs |
563 | * directory that will be removed once the trace ends. | |
564 | */ | |
fa01b1e9 | 565 | if (bdev && !bdev_is_partition(bdev)) |
bad8e64f LC |
566 | dir = q->debugfs_dir; |
567 | else | |
6ac93117 | 568 | bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root); |
2056a782 | 569 | |
b431ef83 LC |
570 | /* |
571 | * As blktrace relies on debugfs for its interface the debugfs directory | |
572 | * is required, contrary to the usual mantra of not checking for debugfs | |
573 | * files or directories. | |
574 | */ | |
575 | if (IS_ERR_OR_NULL(dir)) { | |
576 | pr_warn("debugfs_dir not present for %s so skipping\n", | |
577 | buts->name); | |
578 | ret = -ENOENT; | |
579 | goto err; | |
580 | } | |
581 | ||
6da127ad | 582 | bt->dev = dev; |
2056a782 | 583 | atomic_set(&bt->dropped, 0); |
a404d557 | 584 | INIT_LIST_HEAD(&bt->running_list); |
2056a782 JA |
585 | |
586 | ret = -EIO; | |
c0ea5760 GKH |
587 | debugfs_create_file("dropped", 0444, dir, bt, &blk_dropped_fops); |
588 | debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); | |
02c62304 | 589 | |
171044d4 AB |
590 | bt->rchan = relay_open("trace", dir, buts->buf_size, |
591 | buts->buf_nr, &blk_relay_callbacks, bt); | |
2056a782 JA |
592 | if (!bt->rchan) |
593 | goto err; | |
2056a782 | 594 | |
171044d4 | 595 | bt->act_mask = buts->act_mask; |
2056a782 JA |
596 | if (!bt->act_mask) |
597 | bt->act_mask = (u16) -1; | |
598 | ||
9908c309 | 599 | blk_trace_setup_lba(bt, bdev); |
2056a782 | 600 | |
d0deef5b SD |
601 | /* overwrite with user settings */ |
602 | if (buts->start_lba) | |
603 | bt->start_lba = buts->start_lba; | |
604 | if (buts->end_lba) | |
605 | bt->end_lba = buts->end_lba; | |
606 | ||
171044d4 | 607 | bt->pid = buts->pid; |
2056a782 JA |
608 | bt->trace_state = Blktrace_setup; |
609 | ||
c3dbe541 | 610 | rcu_assign_pointer(q->blk_trace, bt); |
a6da0024 | 611 | get_probe_ref(); |
cbe28296 | 612 | |
6ac93117 | 613 | ret = 0; |
2056a782 | 614 | err: |
6ac93117 | 615 | if (ret) |
30939293 | 616 | blk_trace_free(q, bt); |
2056a782 JA |
617 | return ret; |
618 | } | |
171044d4 | 619 | |
1f2cac10 JA |
620 | static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
621 | struct block_device *bdev, char __user *arg) | |
171044d4 AB |
622 | { |
623 | struct blk_user_trace_setup buts; | |
624 | int ret; | |
625 | ||
626 | ret = copy_from_user(&buts, arg, sizeof(buts)); | |
627 | if (ret) | |
628 | return -EFAULT; | |
629 | ||
d0deef5b | 630 | ret = do_blk_trace_setup(q, name, dev, bdev, &buts); |
171044d4 AB |
631 | if (ret) |
632 | return ret; | |
633 | ||
9a8c28c8 | 634 | if (copy_to_user(arg, &buts, sizeof(buts))) { |
2967acbb | 635 | __blk_trace_remove(q); |
171044d4 | 636 | return -EFAULT; |
9a8c28c8 | 637 | } |
171044d4 AB |
638 | return 0; |
639 | } | |
1f2cac10 JA |
640 | |
641 | int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, | |
642 | struct block_device *bdev, | |
643 | char __user *arg) | |
644 | { | |
645 | int ret; | |
646 | ||
85e0cbbb | 647 | mutex_lock(&q->debugfs_mutex); |
1f2cac10 | 648 | ret = __blk_trace_setup(q, name, dev, bdev, arg); |
85e0cbbb | 649 | mutex_unlock(&q->debugfs_mutex); |
1f2cac10 JA |
650 | |
651 | return ret; | |
652 | } | |
6da127ad | 653 | EXPORT_SYMBOL_GPL(blk_trace_setup); |
2056a782 | 654 | |
62c2a7d9 AB |
655 | #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) |
656 | static int compat_blk_trace_setup(struct request_queue *q, char *name, | |
657 | dev_t dev, struct block_device *bdev, | |
658 | char __user *arg) | |
659 | { | |
660 | struct blk_user_trace_setup buts; | |
661 | struct compat_blk_user_trace_setup cbuts; | |
662 | int ret; | |
663 | ||
664 | if (copy_from_user(&cbuts, arg, sizeof(cbuts))) | |
665 | return -EFAULT; | |
666 | ||
667 | buts = (struct blk_user_trace_setup) { | |
668 | .act_mask = cbuts.act_mask, | |
669 | .buf_size = cbuts.buf_size, | |
670 | .buf_nr = cbuts.buf_nr, | |
671 | .start_lba = cbuts.start_lba, | |
672 | .end_lba = cbuts.end_lba, | |
673 | .pid = cbuts.pid, | |
674 | }; | |
62c2a7d9 AB |
675 | |
676 | ret = do_blk_trace_setup(q, name, dev, bdev, &buts); | |
677 | if (ret) | |
678 | return ret; | |
679 | ||
f8c5e944 | 680 | if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) { |
2967acbb | 681 | __blk_trace_remove(q); |
62c2a7d9 AB |
682 | return -EFAULT; |
683 | } | |
684 | ||
685 | return 0; | |
686 | } | |
687 | #endif | |
688 | ||
1f2cac10 | 689 | static int __blk_trace_startstop(struct request_queue *q, int start) |
2056a782 | 690 | { |
c780e86d | 691 | struct blk_trace *bt; |
2056a782 | 692 | |
c780e86d | 693 | bt = rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 694 | lockdep_is_held(&q->debugfs_mutex)); |
939b3669 | 695 | if (bt == NULL) |
2056a782 JA |
696 | return -EINVAL; |
697 | ||
60a9bb90 YB |
698 | if (start) |
699 | return blk_trace_start(bt); | |
700 | else | |
701 | return blk_trace_stop(bt); | |
2056a782 | 702 | } |
1f2cac10 JA |
703 | |
704 | int blk_trace_startstop(struct request_queue *q, int start) | |
705 | { | |
706 | int ret; | |
707 | ||
85e0cbbb | 708 | mutex_lock(&q->debugfs_mutex); |
1f2cac10 | 709 | ret = __blk_trace_startstop(q, start); |
85e0cbbb | 710 | mutex_unlock(&q->debugfs_mutex); |
1f2cac10 JA |
711 | |
712 | return ret; | |
713 | } | |
6da127ad | 714 | EXPORT_SYMBOL_GPL(blk_trace_startstop); |
2056a782 | 715 | |
5acb3cc2 WL |
716 | /* |
717 | * When reading or writing the blktrace sysfs files, the references to the | |
718 | * opened sysfs or device files should prevent the underlying block device | |
719 | * from being removed. So no further delete protection is really needed. | |
720 | */ | |
721 | ||
2056a782 | 722 | /** |
2e833c8c | 723 | * blk_trace_ioctl - handle the ioctls associated with tracing |
2056a782 | 724 | * @bdev: the block device |
ef18012b | 725 | * @cmd: the ioctl cmd |
2056a782 JA |
726 | * @arg: the argument data, if any |
727 | * | |
728 | **/ | |
729 | int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) | |
730 | { | |
9e0c7efa | 731 | struct request_queue *q = bdev_get_queue(bdev); |
2056a782 | 732 | int ret, start = 0; |
6da127ad | 733 | char b[BDEVNAME_SIZE]; |
2056a782 | 734 | |
85e0cbbb | 735 | mutex_lock(&q->debugfs_mutex); |
2056a782 JA |
736 | |
737 | switch (cmd) { | |
738 | case BLKTRACESETUP: | |
900d156b | 739 | snprintf(b, sizeof(b), "%pg", bdev); |
1f2cac10 | 740 | ret = __blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); |
2056a782 | 741 | break; |
62c2a7d9 AB |
742 | #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) |
743 | case BLKTRACESETUP32: | |
900d156b | 744 | snprintf(b, sizeof(b), "%pg", bdev); |
62c2a7d9 AB |
745 | ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); |
746 | break; | |
747 | #endif | |
2056a782 JA |
748 | case BLKTRACESTART: |
749 | start = 1; | |
df561f66 | 750 | fallthrough; |
2056a782 | 751 | case BLKTRACESTOP: |
1f2cac10 | 752 | ret = __blk_trace_startstop(q, start); |
2056a782 JA |
753 | break; |
754 | case BLKTRACETEARDOWN: | |
1f2cac10 | 755 | ret = __blk_trace_remove(q); |
2056a782 JA |
756 | break; |
757 | default: | |
758 | ret = -ENOTTY; | |
759 | break; | |
760 | } | |
761 | ||
85e0cbbb | 762 | mutex_unlock(&q->debugfs_mutex); |
2056a782 JA |
763 | return ret; |
764 | } | |
765 | ||
766 | /** | |
2e833c8c | 767 | * blk_trace_shutdown - stop and cleanup trace structures |
2056a782 JA |
768 | * @q: the request queue associated with the device |
769 | * | |
770 | **/ | |
165125e1 | 771 | void blk_trace_shutdown(struct request_queue *q) |
2056a782 | 772 | { |
c780e86d | 773 | if (rcu_dereference_protected(q->blk_trace, |
2db96217 | 774 | lockdep_is_held(&q->debugfs_mutex))) |
1f2cac10 | 775 | __blk_trace_remove(q); |
2056a782 | 776 | } |
5f3ea37c | 777 | |
ca1136c9 | 778 | #ifdef CONFIG_BLK_CGROUP |
67c0496e | 779 | static u64 blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) |
ca1136c9 | 780 | { |
bbb1ebe7 | 781 | struct cgroup_subsys_state *blkcg_css; |
c780e86d | 782 | struct blk_trace *bt; |
ca1136c9 | 783 | |
c780e86d JK |
784 | /* We don't use the 'bt' value here except as an optimization... */ |
785 | bt = rcu_dereference_protected(q->blk_trace, 1); | |
ca1136c9 | 786 | if (!bt || !(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP)) |
67c0496e | 787 | return 0; |
ca1136c9 | 788 | |
bbb1ebe7 CH |
789 | blkcg_css = bio_blkcg_css(bio); |
790 | if (!blkcg_css) | |
67c0496e | 791 | return 0; |
bbb1ebe7 | 792 | return cgroup_id(blkcg_css->cgroup); |
ca1136c9 SL |
793 | } |
794 | #else | |
e75ad2cc | 795 | static u64 blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) |
ca1136c9 | 796 | { |
67c0496e | 797 | return 0; |
ca1136c9 SL |
798 | } |
799 | #endif | |
800 | ||
67c0496e | 801 | static u64 |
a54895fa | 802 | blk_trace_request_get_cgid(struct request *rq) |
ca1136c9 SL |
803 | { |
804 | if (!rq->bio) | |
67c0496e | 805 | return 0; |
ca1136c9 | 806 | /* Use the first bio */ |
a54895fa | 807 | return blk_trace_bio_get_cgid(rq->q, rq->bio); |
ca1136c9 SL |
808 | } |
809 | ||
5f3ea37c ACM |
810 | /* |
811 | * blktrace probes | |
812 | */ | |
813 | ||
814 | /** | |
815 | * blk_add_trace_rq - Add a trace for a request oriented action | |
5f3ea37c | 816 | * @rq: the source request |
caf7df12 | 817 | * @error: return status to log |
af5040da | 818 | * @nr_bytes: number of completed bytes |
5f3ea37c | 819 | * @what: the action |
ca1136c9 | 820 | * @cgid: the cgroup info |
5f3ea37c ACM |
821 | * |
822 | * Description: | |
823 | * Records an action against a request. Will log the bio offset + size. | |
824 | * | |
825 | **/ | |
8a7d267b | 826 | static void blk_add_trace_rq(struct request *rq, blk_status_t error, |
67c0496e | 827 | unsigned int nr_bytes, u32 what, u64 cgid) |
5f3ea37c | 828 | { |
c780e86d | 829 | struct blk_trace *bt; |
5f3ea37c | 830 | |
c780e86d JK |
831 | rcu_read_lock(); |
832 | bt = rcu_dereference(rq->q->blk_trace); | |
833 | if (likely(!bt)) { | |
834 | rcu_read_unlock(); | |
5f3ea37c | 835 | return; |
c780e86d | 836 | } |
5f3ea37c | 837 | |
57292b58 | 838 | if (blk_rq_is_passthrough(rq)) |
5f3ea37c | 839 | what |= BLK_TC_ACT(BLK_TC_PC); |
48b77ad6 | 840 | else |
5f3ea37c | 841 | what |= BLK_TC_ACT(BLK_TC_FS); |
48b77ad6 | 842 | |
919dbca8 BVA |
843 | __blk_add_trace(bt, blk_rq_trace_sector(rq), nr_bytes, rq->cmd_flags, |
844 | what, blk_status_to_errno(error), 0, NULL, cgid); | |
c780e86d | 845 | rcu_read_unlock(); |
5f3ea37c ACM |
846 | } |
847 | ||
a54895fa | 848 | static void blk_add_trace_rq_insert(void *ignore, struct request *rq) |
5f3ea37c | 849 | { |
ca1136c9 | 850 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_INSERT, |
a54895fa | 851 | blk_trace_request_get_cgid(rq)); |
5f3ea37c ACM |
852 | } |
853 | ||
a54895fa | 854 | static void blk_add_trace_rq_issue(void *ignore, struct request *rq) |
5f3ea37c | 855 | { |
ca1136c9 | 856 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_ISSUE, |
a54895fa | 857 | blk_trace_request_get_cgid(rq)); |
5f3ea37c ACM |
858 | } |
859 | ||
a54895fa | 860 | static void blk_add_trace_rq_merge(void *ignore, struct request *rq) |
f3bdc62f JK |
861 | { |
862 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_BACKMERGE, | |
a54895fa | 863 | blk_trace_request_get_cgid(rq)); |
f3bdc62f JK |
864 | } |
865 | ||
a54895fa | 866 | static void blk_add_trace_rq_requeue(void *ignore, struct request *rq) |
5f3ea37c | 867 | { |
ca1136c9 | 868 | blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_REQUEUE, |
a54895fa | 869 | blk_trace_request_get_cgid(rq)); |
5f3ea37c ACM |
870 | } |
871 | ||
caf7df12 | 872 | static void blk_add_trace_rq_complete(void *ignore, struct request *rq, |
8a7d267b | 873 | blk_status_t error, unsigned int nr_bytes) |
5f3ea37c | 874 | { |
ca1136c9 | 875 | blk_add_trace_rq(rq, error, nr_bytes, BLK_TA_COMPLETE, |
a54895fa | 876 | blk_trace_request_get_cgid(rq)); |
5f3ea37c ACM |
877 | } |
878 | ||
879 | /** | |
880 | * blk_add_trace_bio - Add a trace for a bio oriented action | |
881 | * @q: queue the io is for | |
882 | * @bio: the source bio | |
883 | * @what: the action | |
797a455d | 884 | * @error: error, if any |
5f3ea37c ACM |
885 | * |
886 | * Description: | |
887 | * Records an action against a bio. Will log the bio offset + size. | |
888 | * | |
889 | **/ | |
890 | static void blk_add_trace_bio(struct request_queue *q, struct bio *bio, | |
1690102d | 891 | u32 what, int error) |
5f3ea37c | 892 | { |
c780e86d | 893 | struct blk_trace *bt; |
5f3ea37c | 894 | |
c780e86d JK |
895 | rcu_read_lock(); |
896 | bt = rcu_dereference(q->blk_trace); | |
897 | if (likely(!bt)) { | |
898 | rcu_read_unlock(); | |
5f3ea37c | 899 | return; |
c780e86d | 900 | } |
5f3ea37c | 901 | |
4f024f37 | 902 | __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, |
919dbca8 | 903 | bio->bi_opf, what, error, 0, NULL, |
1690102d | 904 | blk_trace_bio_get_cgid(q, bio)); |
c780e86d | 905 | rcu_read_unlock(); |
5f3ea37c ACM |
906 | } |
907 | ||
e8a676d6 | 908 | static void blk_add_trace_bio_bounce(void *ignore, struct bio *bio) |
5f3ea37c | 909 | { |
309dca30 | 910 | blk_add_trace_bio(bio->bi_bdev->bd_disk->queue, bio, BLK_TA_BOUNCE, 0); |
5f3ea37c ACM |
911 | } |
912 | ||
0a82a8d1 | 913 | static void blk_add_trace_bio_complete(void *ignore, |
d24de76a | 914 | struct request_queue *q, struct bio *bio) |
5f3ea37c | 915 | { |
d24de76a CH |
916 | blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, |
917 | blk_status_to_errno(bio->bi_status)); | |
5f3ea37c ACM |
918 | } |
919 | ||
e8a676d6 | 920 | static void blk_add_trace_bio_backmerge(void *ignore, struct bio *bio) |
5f3ea37c | 921 | { |
309dca30 CH |
922 | blk_add_trace_bio(bio->bi_bdev->bd_disk->queue, bio, BLK_TA_BACKMERGE, |
923 | 0); | |
5f3ea37c ACM |
924 | } |
925 | ||
e8a676d6 | 926 | static void blk_add_trace_bio_frontmerge(void *ignore, struct bio *bio) |
5f3ea37c | 927 | { |
309dca30 CH |
928 | blk_add_trace_bio(bio->bi_bdev->bd_disk->queue, bio, BLK_TA_FRONTMERGE, |
929 | 0); | |
5f3ea37c ACM |
930 | } |
931 | ||
e8a676d6 | 932 | static void blk_add_trace_bio_queue(void *ignore, struct bio *bio) |
5f3ea37c | 933 | { |
309dca30 | 934 | blk_add_trace_bio(bio->bi_bdev->bd_disk->queue, bio, BLK_TA_QUEUE, 0); |
5f3ea37c ACM |
935 | } |
936 | ||
e8a676d6 | 937 | static void blk_add_trace_getrq(void *ignore, struct bio *bio) |
5f3ea37c | 938 | { |
309dca30 | 939 | blk_add_trace_bio(bio->bi_bdev->bd_disk->queue, bio, BLK_TA_GETRQ, 0); |
5f3ea37c ACM |
940 | } |
941 | ||
38516ab5 | 942 | static void blk_add_trace_plug(void *ignore, struct request_queue *q) |
5f3ea37c | 943 | { |
c780e86d | 944 | struct blk_trace *bt; |
5f3ea37c | 945 | |
c780e86d JK |
946 | rcu_read_lock(); |
947 | bt = rcu_dereference(q->blk_trace); | |
5f3ea37c | 948 | if (bt) |
919dbca8 | 949 | __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL, 0); |
c780e86d | 950 | rcu_read_unlock(); |
5f3ea37c ACM |
951 | } |
952 | ||
49cac01e JA |
953 | static void blk_add_trace_unplug(void *ignore, struct request_queue *q, |
954 | unsigned int depth, bool explicit) | |
5f3ea37c | 955 | { |
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) { |
94b5eb28 | 961 | __be64 rpdu = cpu_to_be64(depth); |
49cac01e | 962 | u32 what; |
5f3ea37c | 963 | |
49cac01e JA |
964 | if (explicit) |
965 | what = BLK_TA_UNPLUG_IO; | |
966 | else | |
967 | what = BLK_TA_UNPLUG_TIMER; | |
968 | ||
919dbca8 | 969 | __blk_add_trace(bt, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu, 0); |
5f3ea37c | 970 | } |
c780e86d | 971 | rcu_read_unlock(); |
5f3ea37c ACM |
972 | } |
973 | ||
eb6f7f7c | 974 | static void blk_add_trace_split(void *ignore, struct bio *bio, unsigned int pdu) |
5f3ea37c | 975 | { |
309dca30 | 976 | struct request_queue *q = bio->bi_bdev->bd_disk->queue; |
c780e86d | 977 | struct blk_trace *bt; |
5f3ea37c | 978 | |
c780e86d JK |
979 | rcu_read_lock(); |
980 | bt = rcu_dereference(q->blk_trace); | |
5f3ea37c ACM |
981 | if (bt) { |
982 | __be64 rpdu = cpu_to_be64(pdu); | |
983 | ||
4f024f37 | 984 | __blk_add_trace(bt, bio->bi_iter.bi_sector, |
919dbca8 | 985 | bio->bi_iter.bi_size, bio->bi_opf, BLK_TA_SPLIT, |
48bc3cd3 CK |
986 | blk_status_to_errno(bio->bi_status), |
987 | sizeof(rpdu), &rpdu, | |
988 | blk_trace_bio_get_cgid(q, bio)); | |
5f3ea37c | 989 | } |
c780e86d | 990 | rcu_read_unlock(); |
5f3ea37c ACM |
991 | } |
992 | ||
993 | /** | |
d07335e5 | 994 | * blk_add_trace_bio_remap - Add a trace for a bio-remap operation |
546cf44a | 995 | * @ignore: trace callback data parameter (not used) |
5f3ea37c | 996 | * @bio: the source bio |
1c02fca6 | 997 | * @dev: source device |
a42aaa3b | 998 | * @from: source sector |
5f3ea37c | 999 | * |
1c02fca6 | 1000 | * Called after a bio is remapped to a different device and/or sector. |
5f3ea37c | 1001 | **/ |
1c02fca6 CH |
1002 | static void blk_add_trace_bio_remap(void *ignore, struct bio *bio, dev_t dev, |
1003 | sector_t from) | |
5f3ea37c | 1004 | { |
309dca30 | 1005 | struct request_queue *q = bio->bi_bdev->bd_disk->queue; |
c780e86d | 1006 | struct blk_trace *bt; |
5f3ea37c ACM |
1007 | struct blk_io_trace_remap r; |
1008 | ||
c780e86d JK |
1009 | rcu_read_lock(); |
1010 | bt = rcu_dereference(q->blk_trace); | |
1011 | if (likely(!bt)) { | |
1012 | rcu_read_unlock(); | |
5f3ea37c | 1013 | return; |
c780e86d | 1014 | } |
5f3ea37c | 1015 | |
a42aaa3b | 1016 | r.device_from = cpu_to_be32(dev); |
74d46992 | 1017 | r.device_to = cpu_to_be32(bio_dev(bio)); |
a42aaa3b | 1018 | r.sector_from = cpu_to_be64(from); |
5f3ea37c | 1019 | |
4f024f37 | 1020 | __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, |
919dbca8 | 1021 | bio->bi_opf, BLK_TA_REMAP, |
48bc3cd3 | 1022 | blk_status_to_errno(bio->bi_status), |
ca1136c9 | 1023 | sizeof(r), &r, blk_trace_bio_get_cgid(q, bio)); |
c780e86d | 1024 | rcu_read_unlock(); |
5f3ea37c ACM |
1025 | } |
1026 | ||
b0da3f0d JN |
1027 | /** |
1028 | * blk_add_trace_rq_remap - Add a trace for a request-remap operation | |
546cf44a | 1029 | * @ignore: trace callback data parameter (not used) |
b0da3f0d JN |
1030 | * @rq: the source request |
1031 | * @dev: target device | |
1032 | * @from: source sector | |
1033 | * | |
1034 | * Description: | |
1035 | * Device mapper remaps request to other devices. | |
1036 | * Add a trace for that action. | |
1037 | * | |
1038 | **/ | |
a54895fa | 1039 | static void blk_add_trace_rq_remap(void *ignore, struct request *rq, dev_t dev, |
b0da3f0d JN |
1040 | sector_t from) |
1041 | { | |
c780e86d | 1042 | struct blk_trace *bt; |
b0da3f0d JN |
1043 | struct blk_io_trace_remap r; |
1044 | ||
c780e86d | 1045 | rcu_read_lock(); |
a54895fa | 1046 | bt = rcu_dereference(rq->q->blk_trace); |
c780e86d JK |
1047 | if (likely(!bt)) { |
1048 | rcu_read_unlock(); | |
b0da3f0d | 1049 | return; |
c780e86d | 1050 | } |
b0da3f0d JN |
1051 | |
1052 | r.device_from = cpu_to_be32(dev); | |
f3fa33ac | 1053 | r.device_to = cpu_to_be32(disk_devt(rq->q->disk)); |
b0da3f0d JN |
1054 | r.sector_from = cpu_to_be64(from); |
1055 | ||
1056 | __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), | |
919dbca8 | 1057 | rq->cmd_flags, BLK_TA_REMAP, 0, |
a54895fa | 1058 | sizeof(r), &r, blk_trace_request_get_cgid(rq)); |
c780e86d | 1059 | rcu_read_unlock(); |
b0da3f0d JN |
1060 | } |
1061 | ||
5f3ea37c ACM |
1062 | /** |
1063 | * blk_add_driver_data - Add binary message with driver-specific data | |
5f3ea37c ACM |
1064 | * @rq: io request |
1065 | * @data: driver-specific data | |
1066 | * @len: length of driver-specific data | |
1067 | * | |
1068 | * Description: | |
1069 | * Some drivers might want to write driver-specific data per request. | |
1070 | * | |
1071 | **/ | |
a54895fa | 1072 | void blk_add_driver_data(struct request *rq, void *data, size_t len) |
5f3ea37c | 1073 | { |
c780e86d | 1074 | struct blk_trace *bt; |
5f3ea37c | 1075 | |
c780e86d | 1076 | rcu_read_lock(); |
a54895fa | 1077 | bt = rcu_dereference(rq->q->blk_trace); |
c780e86d JK |
1078 | if (likely(!bt)) { |
1079 | rcu_read_unlock(); | |
5f3ea37c | 1080 | return; |
c780e86d | 1081 | } |
5f3ea37c | 1082 | |
919dbca8 | 1083 | __blk_add_trace(bt, blk_rq_trace_sector(rq), blk_rq_bytes(rq), 0, |
ca1136c9 | 1084 | BLK_TA_DRV_DATA, 0, len, data, |
a54895fa | 1085 | blk_trace_request_get_cgid(rq)); |
c780e86d | 1086 | rcu_read_unlock(); |
5f3ea37c ACM |
1087 | } |
1088 | EXPORT_SYMBOL_GPL(blk_add_driver_data); | |
1089 | ||
3c289ba7 | 1090 | static void blk_register_tracepoints(void) |
5f3ea37c ACM |
1091 | { |
1092 | int ret; | |
1093 | ||
38516ab5 | 1094 | ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); |
5f3ea37c | 1095 | WARN_ON(ret); |
38516ab5 | 1096 | ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); |
5f3ea37c | 1097 | WARN_ON(ret); |
f3bdc62f JK |
1098 | ret = register_trace_block_rq_merge(blk_add_trace_rq_merge, NULL); |
1099 | WARN_ON(ret); | |
38516ab5 | 1100 | ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); |
5f3ea37c | 1101 | WARN_ON(ret); |
38516ab5 | 1102 | ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); |
5f3ea37c | 1103 | WARN_ON(ret); |
38516ab5 | 1104 | ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); |
5f3ea37c | 1105 | WARN_ON(ret); |
38516ab5 | 1106 | ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); |
5f3ea37c | 1107 | WARN_ON(ret); |
38516ab5 | 1108 | ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); |
5f3ea37c | 1109 | WARN_ON(ret); |
38516ab5 | 1110 | ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); |
5f3ea37c | 1111 | WARN_ON(ret); |
38516ab5 | 1112 | ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); |
5f3ea37c | 1113 | WARN_ON(ret); |
38516ab5 | 1114 | ret = register_trace_block_getrq(blk_add_trace_getrq, NULL); |
5f3ea37c | 1115 | WARN_ON(ret); |
38516ab5 | 1116 | ret = register_trace_block_plug(blk_add_trace_plug, NULL); |
5f3ea37c | 1117 | WARN_ON(ret); |
49cac01e | 1118 | ret = register_trace_block_unplug(blk_add_trace_unplug, NULL); |
5f3ea37c | 1119 | WARN_ON(ret); |
38516ab5 | 1120 | ret = register_trace_block_split(blk_add_trace_split, NULL); |
5f3ea37c | 1121 | WARN_ON(ret); |
d07335e5 | 1122 | ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); |
5f3ea37c | 1123 | WARN_ON(ret); |
38516ab5 | 1124 | ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); |
b0da3f0d | 1125 | WARN_ON(ret); |
5f3ea37c ACM |
1126 | } |
1127 | ||
1128 | static void blk_unregister_tracepoints(void) | |
1129 | { | |
38516ab5 | 1130 | unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); |
d07335e5 | 1131 | unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); |
38516ab5 | 1132 | unregister_trace_block_split(blk_add_trace_split, NULL); |
49cac01e | 1133 | unregister_trace_block_unplug(blk_add_trace_unplug, NULL); |
38516ab5 | 1134 | unregister_trace_block_plug(blk_add_trace_plug, NULL); |
38516ab5 SR |
1135 | unregister_trace_block_getrq(blk_add_trace_getrq, NULL); |
1136 | unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); | |
1137 | unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); | |
1138 | unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); | |
1139 | unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); | |
1140 | unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); | |
1141 | unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); | |
1142 | unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); | |
f3bdc62f | 1143 | unregister_trace_block_rq_merge(blk_add_trace_rq_merge, NULL); |
38516ab5 SR |
1144 | unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); |
1145 | unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); | |
5f3ea37c ACM |
1146 | |
1147 | tracepoint_synchronize_unregister(); | |
1148 | } | |
c71a8961 ACM |
1149 | |
1150 | /* | |
1151 | * struct blk_io_tracer formatting routines | |
1152 | */ | |
1153 | ||
1154 | static void fill_rwbs(char *rwbs, const struct blk_io_trace *t) | |
1155 | { | |
157f9c00 | 1156 | int i = 0; |
65796348 | 1157 | int tc = t->action >> BLK_TC_SHIFT; |
157f9c00 | 1158 | |
ca1136c9 | 1159 | if ((t->action & ~__BLK_TN_CGROUP) == BLK_TN_MESSAGE) { |
18cea459 LZ |
1160 | rwbs[i++] = 'N'; |
1161 | goto out; | |
1162 | } | |
1163 | ||
c09c47ca NK |
1164 | if (tc & BLK_TC_FLUSH) |
1165 | rwbs[i++] = 'F'; | |
1166 | ||
65796348 | 1167 | if (tc & BLK_TC_DISCARD) |
157f9c00 | 1168 | rwbs[i++] = 'D'; |
65796348 | 1169 | else if (tc & BLK_TC_WRITE) |
157f9c00 ACM |
1170 | rwbs[i++] = 'W'; |
1171 | else if (t->bytes) | |
1172 | rwbs[i++] = 'R'; | |
1173 | else | |
1174 | rwbs[i++] = 'N'; | |
1175 | ||
c09c47ca NK |
1176 | if (tc & BLK_TC_FUA) |
1177 | rwbs[i++] = 'F'; | |
65796348 | 1178 | if (tc & BLK_TC_AHEAD) |
157f9c00 | 1179 | rwbs[i++] = 'A'; |
65796348 | 1180 | if (tc & BLK_TC_SYNC) |
157f9c00 | 1181 | rwbs[i++] = 'S'; |
65796348 | 1182 | if (tc & BLK_TC_META) |
157f9c00 | 1183 | rwbs[i++] = 'M'; |
18cea459 | 1184 | out: |
157f9c00 | 1185 | rwbs[i] = '\0'; |
c71a8961 ACM |
1186 | } |
1187 | ||
1188 | static inline | |
1189 | const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) | |
1190 | { | |
1191 | return (const struct blk_io_trace *)ent; | |
1192 | } | |
1193 | ||
ca1136c9 SL |
1194 | static inline const void *pdu_start(const struct trace_entry *ent, bool has_cg) |
1195 | { | |
67c0496e | 1196 | return (void *)(te_blk_io_trace(ent) + 1) + (has_cg ? sizeof(u64) : 0); |
ca1136c9 SL |
1197 | } |
1198 | ||
67c0496e | 1199 | static inline u64 t_cgid(const struct trace_entry *ent) |
c71a8961 | 1200 | { |
67c0496e | 1201 | return *(u64 *)(te_blk_io_trace(ent) + 1); |
ca1136c9 SL |
1202 | } |
1203 | ||
1204 | static inline int pdu_real_len(const struct trace_entry *ent, bool has_cg) | |
1205 | { | |
67c0496e | 1206 | return te_blk_io_trace(ent)->pdu_len - (has_cg ? sizeof(u64) : 0); |
c71a8961 ACM |
1207 | } |
1208 | ||
66de7792 LZ |
1209 | static inline u32 t_action(const struct trace_entry *ent) |
1210 | { | |
1211 | return te_blk_io_trace(ent)->action; | |
1212 | } | |
1213 | ||
1214 | static inline u32 t_bytes(const struct trace_entry *ent) | |
1215 | { | |
1216 | return te_blk_io_trace(ent)->bytes; | |
1217 | } | |
1218 | ||
c71a8961 ACM |
1219 | static inline u32 t_sec(const struct trace_entry *ent) |
1220 | { | |
1221 | return te_blk_io_trace(ent)->bytes >> 9; | |
1222 | } | |
1223 | ||
1224 | static inline unsigned long long t_sector(const struct trace_entry *ent) | |
1225 | { | |
1226 | return te_blk_io_trace(ent)->sector; | |
1227 | } | |
1228 | ||
1229 | static inline __u16 t_error(const struct trace_entry *ent) | |
1230 | { | |
e0dc81be | 1231 | return te_blk_io_trace(ent)->error; |
c71a8961 ACM |
1232 | } |
1233 | ||
ca1136c9 | 1234 | static __u64 get_pdu_int(const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1235 | { |
71df3fd8 | 1236 | const __be64 *val = pdu_start(ent, has_cg); |
c71a8961 ACM |
1237 | return be64_to_cpu(*val); |
1238 | } | |
1239 | ||
ca1136c9 SL |
1240 | typedef void (blk_log_action_t) (struct trace_iterator *iter, const char *act, |
1241 | bool has_cg); | |
b6a4b0c3 | 1242 | |
ca1136c9 SL |
1243 | static void blk_log_action_classic(struct trace_iterator *iter, const char *act, |
1244 | bool has_cg) | |
c71a8961 | 1245 | { |
c09c47ca | 1246 | char rwbs[RWBS_LEN]; |
35ac51bf LZ |
1247 | unsigned long long ts = iter->ts; |
1248 | unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); | |
c71a8961 | 1249 | unsigned secs = (unsigned long)ts; |
b6a4b0c3 | 1250 | const struct blk_io_trace *t = te_blk_io_trace(iter->ent); |
c71a8961 ACM |
1251 | |
1252 | fill_rwbs(rwbs, t); | |
1253 | ||
f4a1d08c SRRH |
1254 | trace_seq_printf(&iter->seq, |
1255 | "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", | |
1256 | MAJOR(t->device), MINOR(t->device), iter->cpu, | |
1257 | secs, nsec_rem, iter->ent->pid, act, rwbs); | |
c71a8961 ACM |
1258 | } |
1259 | ||
ca1136c9 SL |
1260 | static void blk_log_action(struct trace_iterator *iter, const char *act, |
1261 | bool has_cg) | |
c71a8961 | 1262 | { |
c09c47ca | 1263 | char rwbs[RWBS_LEN]; |
b6a4b0c3 LZ |
1264 | const struct blk_io_trace *t = te_blk_io_trace(iter->ent); |
1265 | ||
c71a8961 | 1266 | fill_rwbs(rwbs, t); |
ca1136c9 | 1267 | if (has_cg) { |
67c0496e | 1268 | u64 id = t_cgid(iter->ent); |
ca1136c9 | 1269 | |
69fd5c39 SL |
1270 | if (blk_tracer_flags.val & TRACE_BLK_OPT_CGNAME) { |
1271 | char blkcg_name_buf[NAME_MAX + 1] = "<...>"; | |
1272 | ||
1273 | cgroup_path_from_kernfs_id(id, blkcg_name_buf, | |
1274 | sizeof(blkcg_name_buf)); | |
1275 | trace_seq_printf(&iter->seq, "%3d,%-3d %s %2s %3s ", | |
1276 | MAJOR(t->device), MINOR(t->device), | |
1277 | blkcg_name_buf, act, rwbs); | |
40430452 TH |
1278 | } else { |
1279 | /* | |
1280 | * The cgid portion used to be "INO,GEN". Userland | |
1281 | * builds a FILEID_INO32_GEN fid out of them and | |
1282 | * opens the cgroup using open_by_handle_at(2). | |
1283 | * While 32bit ino setups are still the same, 64bit | |
1284 | * ones now use the 64bit ino as the whole ID and | |
1285 | * no longer use generation. | |
1286 | * | |
2b5894cc | 1287 | * Regardless of the content, always output |
40430452 TH |
1288 | * "LOW32,HIGH32" so that FILEID_INO32_GEN fid can |
1289 | * be mapped back to @id on both 64 and 32bit ino | |
1290 | * setups. See __kernfs_fh_to_dentry(). | |
1291 | */ | |
69fd5c39 | 1292 | trace_seq_printf(&iter->seq, |
40430452 | 1293 | "%3d,%-3d %llx,%-llx %2s %3s ", |
ca1136c9 | 1294 | MAJOR(t->device), MINOR(t->device), |
40430452 TH |
1295 | id & U32_MAX, id >> 32, act, rwbs); |
1296 | } | |
ca1136c9 SL |
1297 | } else |
1298 | trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", | |
1299 | MAJOR(t->device), MINOR(t->device), act, rwbs); | |
c71a8961 ACM |
1300 | } |
1301 | ||
ca1136c9 SL |
1302 | static void blk_log_dump_pdu(struct trace_seq *s, |
1303 | const struct trace_entry *ent, bool has_cg) | |
66de7792 | 1304 | { |
04986257 | 1305 | const unsigned char *pdu_buf; |
66de7792 | 1306 | int pdu_len; |
f4a1d08c | 1307 | int i, end; |
66de7792 | 1308 | |
ca1136c9 SL |
1309 | pdu_buf = pdu_start(ent, has_cg); |
1310 | pdu_len = pdu_real_len(ent, has_cg); | |
66de7792 LZ |
1311 | |
1312 | if (!pdu_len) | |
f4a1d08c | 1313 | return; |
66de7792 LZ |
1314 | |
1315 | /* find the last zero that needs to be printed */ | |
1316 | for (end = pdu_len - 1; end >= 0; end--) | |
1317 | if (pdu_buf[end]) | |
1318 | break; | |
1319 | end++; | |
1320 | ||
f4a1d08c | 1321 | trace_seq_putc(s, '('); |
66de7792 LZ |
1322 | |
1323 | for (i = 0; i < pdu_len; i++) { | |
1324 | ||
f4a1d08c SRRH |
1325 | trace_seq_printf(s, "%s%02x", |
1326 | i == 0 ? "" : " ", pdu_buf[i]); | |
66de7792 LZ |
1327 | |
1328 | /* | |
2b5894cc | 1329 | * stop when the rest is just zeros and indicate so |
66de7792 LZ |
1330 | * with a ".." appended |
1331 | */ | |
f4a1d08c SRRH |
1332 | if (i == end && end != pdu_len - 1) { |
1333 | trace_seq_puts(s, " ..) "); | |
1334 | return; | |
1335 | } | |
66de7792 LZ |
1336 | } |
1337 | ||
f4a1d08c | 1338 | trace_seq_puts(s, ") "); |
66de7792 LZ |
1339 | } |
1340 | ||
ca1136c9 | 1341 | static void blk_log_generic(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1342 | { |
4ca53085 SR |
1343 | char cmd[TASK_COMM_LEN]; |
1344 | ||
1345 | trace_find_cmdline(ent->pid, cmd); | |
c71a8961 | 1346 | |
66de7792 | 1347 | if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { |
f4a1d08c | 1348 | trace_seq_printf(s, "%u ", t_bytes(ent)); |
ca1136c9 | 1349 | blk_log_dump_pdu(s, ent, has_cg); |
f4a1d08c | 1350 | trace_seq_printf(s, "[%s]\n", cmd); |
66de7792 LZ |
1351 | } else { |
1352 | if (t_sec(ent)) | |
f4a1d08c | 1353 | trace_seq_printf(s, "%llu + %u [%s]\n", |
66de7792 | 1354 | t_sector(ent), t_sec(ent), cmd); |
f4a1d08c SRRH |
1355 | else |
1356 | trace_seq_printf(s, "[%s]\n", cmd); | |
66de7792 | 1357 | } |
c71a8961 ACM |
1358 | } |
1359 | ||
f4a1d08c | 1360 | static void blk_log_with_error(struct trace_seq *s, |
ca1136c9 | 1361 | const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1362 | { |
66de7792 | 1363 | if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { |
ca1136c9 | 1364 | blk_log_dump_pdu(s, ent, has_cg); |
f4a1d08c | 1365 | trace_seq_printf(s, "[%d]\n", t_error(ent)); |
66de7792 LZ |
1366 | } else { |
1367 | if (t_sec(ent)) | |
f4a1d08c SRRH |
1368 | trace_seq_printf(s, "%llu + %u [%d]\n", |
1369 | t_sector(ent), | |
1370 | t_sec(ent), t_error(ent)); | |
1371 | else | |
1372 | trace_seq_printf(s, "%llu [%d]\n", | |
1373 | t_sector(ent), t_error(ent)); | |
66de7792 | 1374 | } |
c71a8961 ACM |
1375 | } |
1376 | ||
ca1136c9 | 1377 | static void blk_log_remap(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1378 | { |
5aec598c | 1379 | const struct blk_io_trace_remap *__r = pdu_start(ent, has_cg); |
c71a8961 | 1380 | |
f4a1d08c SRRH |
1381 | trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", |
1382 | t_sector(ent), t_sec(ent), | |
5aec598c CK |
1383 | MAJOR(be32_to_cpu(__r->device_from)), |
1384 | MINOR(be32_to_cpu(__r->device_from)), | |
1385 | be64_to_cpu(__r->sector_from)); | |
c71a8961 ACM |
1386 | } |
1387 | ||
ca1136c9 | 1388 | static void blk_log_plug(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1389 | { |
4ca53085 SR |
1390 | char cmd[TASK_COMM_LEN]; |
1391 | ||
1392 | trace_find_cmdline(ent->pid, cmd); | |
1393 | ||
f4a1d08c | 1394 | trace_seq_printf(s, "[%s]\n", cmd); |
c71a8961 ACM |
1395 | } |
1396 | ||
ca1136c9 | 1397 | static void blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1398 | { |
4ca53085 SR |
1399 | char cmd[TASK_COMM_LEN]; |
1400 | ||
1401 | trace_find_cmdline(ent->pid, cmd); | |
1402 | ||
ca1136c9 | 1403 | trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent, has_cg)); |
c71a8961 ACM |
1404 | } |
1405 | ||
ca1136c9 | 1406 | static void blk_log_split(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) |
c71a8961 | 1407 | { |
4ca53085 SR |
1408 | char cmd[TASK_COMM_LEN]; |
1409 | ||
1410 | trace_find_cmdline(ent->pid, cmd); | |
1411 | ||
f4a1d08c | 1412 | trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), |
ca1136c9 | 1413 | get_pdu_int(ent, has_cg), cmd); |
c71a8961 ACM |
1414 | } |
1415 | ||
ca1136c9 SL |
1416 | static void blk_log_msg(struct trace_seq *s, const struct trace_entry *ent, |
1417 | bool has_cg) | |
18cea459 | 1418 | { |
18cea459 | 1419 | |
ca1136c9 SL |
1420 | trace_seq_putmem(s, pdu_start(ent, has_cg), |
1421 | pdu_real_len(ent, has_cg)); | |
f4a1d08c | 1422 | trace_seq_putc(s, '\n'); |
18cea459 LZ |
1423 | } |
1424 | ||
c71a8961 ACM |
1425 | /* |
1426 | * struct tracer operations | |
1427 | */ | |
1428 | ||
1429 | static void blk_tracer_print_header(struct seq_file *m) | |
1430 | { | |
1431 | if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) | |
1432 | return; | |
1433 | seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" | |
1434 | "# | | | | | |\n"); | |
1435 | } | |
1436 | ||
1437 | static void blk_tracer_start(struct trace_array *tr) | |
1438 | { | |
ad5dd549 | 1439 | blk_tracer_enabled = true; |
c71a8961 ACM |
1440 | } |
1441 | ||
1442 | static int blk_tracer_init(struct trace_array *tr) | |
1443 | { | |
1444 | blk_tr = tr; | |
1445 | blk_tracer_start(tr); | |
c71a8961 ACM |
1446 | return 0; |
1447 | } | |
1448 | ||
1449 | static void blk_tracer_stop(struct trace_array *tr) | |
1450 | { | |
ad5dd549 | 1451 | blk_tracer_enabled = false; |
c71a8961 ACM |
1452 | } |
1453 | ||
1454 | static void blk_tracer_reset(struct trace_array *tr) | |
1455 | { | |
c71a8961 ACM |
1456 | blk_tracer_stop(tr); |
1457 | } | |
1458 | ||
e4955c99 | 1459 | static const struct { |
c71a8961 | 1460 | const char *act[2]; |
ca1136c9 SL |
1461 | void (*print)(struct trace_seq *s, const struct trace_entry *ent, |
1462 | bool has_cg); | |
e4955c99 | 1463 | } what2act[] = { |
ef18012b | 1464 | [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, |
c71a8961 ACM |
1465 | [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, |
1466 | [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, | |
1467 | [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, | |
1468 | [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, | |
1469 | [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, | |
1470 | [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, | |
1471 | [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, | |
1472 | [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, | |
1473 | [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, | |
49cac01e | 1474 | [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, |
c71a8961 ACM |
1475 | [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, |
1476 | [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, | |
1477 | [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, | |
1478 | [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, | |
1479 | }; | |
1480 | ||
b6a4b0c3 LZ |
1481 | static enum print_line_t print_one_line(struct trace_iterator *iter, |
1482 | bool classic) | |
c71a8961 | 1483 | { |
983f938a | 1484 | struct trace_array *tr = iter->tr; |
2c9b238e | 1485 | struct trace_seq *s = &iter->seq; |
b6a4b0c3 LZ |
1486 | const struct blk_io_trace *t; |
1487 | u16 what; | |
b6a4b0c3 LZ |
1488 | bool long_act; |
1489 | blk_log_action_t *log_action; | |
ca1136c9 | 1490 | bool has_cg; |
c71a8961 | 1491 | |
b6a4b0c3 | 1492 | t = te_blk_io_trace(iter->ent); |
ca1136c9 | 1493 | what = (t->action & ((1 << BLK_TC_SHIFT) - 1)) & ~__BLK_TA_CGROUP; |
983f938a | 1494 | long_act = !!(tr->trace_flags & TRACE_ITER_VERBOSE); |
b6a4b0c3 | 1495 | log_action = classic ? &blk_log_action_classic : &blk_log_action; |
ca1136c9 | 1496 | has_cg = t->action & __BLK_TA_CGROUP; |
08a06b83 | 1497 | |
ca1136c9 SL |
1498 | if ((t->action & ~__BLK_TN_CGROUP) == BLK_TN_MESSAGE) { |
1499 | log_action(iter, long_act ? "message" : "m", has_cg); | |
1500 | blk_log_msg(s, iter->ent, has_cg); | |
b7d7641e | 1501 | return trace_handle_return(s); |
18cea459 LZ |
1502 | } |
1503 | ||
eb08f8eb | 1504 | if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) |
f4a1d08c | 1505 | trace_seq_printf(s, "Unknown action %x\n", what); |
c71a8961 | 1506 | else { |
ca1136c9 SL |
1507 | log_action(iter, what2act[what].act[long_act], has_cg); |
1508 | what2act[what].print(s, iter->ent, has_cg); | |
c71a8961 | 1509 | } |
f4a1d08c SRRH |
1510 | |
1511 | return trace_handle_return(s); | |
c71a8961 ACM |
1512 | } |
1513 | ||
b6a4b0c3 | 1514 | static enum print_line_t blk_trace_event_print(struct trace_iterator *iter, |
a9a57763 | 1515 | int flags, struct trace_event *event) |
b6a4b0c3 | 1516 | { |
b6a4b0c3 LZ |
1517 | return print_one_line(iter, false); |
1518 | } | |
1519 | ||
f4a1d08c | 1520 | static void blk_trace_synthesize_old_trace(struct trace_iterator *iter) |
08a06b83 ACM |
1521 | { |
1522 | struct trace_seq *s = &iter->seq; | |
1523 | struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; | |
1524 | const int offset = offsetof(struct blk_io_trace, sector); | |
1525 | struct blk_io_trace old = { | |
1526 | .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, | |
6c051ce0 | 1527 | .time = iter->ts, |
08a06b83 ACM |
1528 | }; |
1529 | ||
f4a1d08c SRRH |
1530 | trace_seq_putmem(s, &old, offset); |
1531 | trace_seq_putmem(s, &t->sector, | |
1532 | sizeof(old) - offset + t->pdu_len); | |
08a06b83 ACM |
1533 | } |
1534 | ||
ae7462b4 | 1535 | static enum print_line_t |
a9a57763 SR |
1536 | blk_trace_event_print_binary(struct trace_iterator *iter, int flags, |
1537 | struct trace_event *event) | |
08a06b83 | 1538 | { |
f4a1d08c SRRH |
1539 | blk_trace_synthesize_old_trace(iter); |
1540 | ||
1541 | return trace_handle_return(&iter->seq); | |
08a06b83 ACM |
1542 | } |
1543 | ||
c71a8961 ACM |
1544 | static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) |
1545 | { | |
f596da3e YJ |
1546 | if ((iter->ent->type != TRACE_BLK) || |
1547 | !(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) | |
c71a8961 ACM |
1548 | return TRACE_TYPE_UNHANDLED; |
1549 | ||
b6a4b0c3 | 1550 | return print_one_line(iter, true); |
c71a8961 ACM |
1551 | } |
1552 | ||
8c1a49ae SRRH |
1553 | static int |
1554 | blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) | |
f3948f88 LZ |
1555 | { |
1556 | /* don't output context-info for blk_classic output */ | |
1557 | if (bit == TRACE_BLK_OPT_CLASSIC) { | |
1558 | if (set) | |
983f938a | 1559 | tr->trace_flags &= ~TRACE_ITER_CONTEXT_INFO; |
f3948f88 | 1560 | else |
983f938a | 1561 | tr->trace_flags |= TRACE_ITER_CONTEXT_INFO; |
f3948f88 LZ |
1562 | } |
1563 | return 0; | |
1564 | } | |
1565 | ||
c71a8961 ACM |
1566 | static struct tracer blk_tracer __read_mostly = { |
1567 | .name = "blk", | |
1568 | .init = blk_tracer_init, | |
1569 | .reset = blk_tracer_reset, | |
1570 | .start = blk_tracer_start, | |
1571 | .stop = blk_tracer_stop, | |
1572 | .print_header = blk_tracer_print_header, | |
1573 | .print_line = blk_tracer_print_line, | |
1574 | .flags = &blk_tracer_flags, | |
f3948f88 | 1575 | .set_flag = blk_tracer_set_flag, |
c71a8961 ACM |
1576 | }; |
1577 | ||
a9a57763 | 1578 | static struct trace_event_functions trace_blk_event_funcs = { |
c71a8961 | 1579 | .trace = blk_trace_event_print, |
08a06b83 | 1580 | .binary = blk_trace_event_print_binary, |
c71a8961 ACM |
1581 | }; |
1582 | ||
a9a57763 SR |
1583 | static struct trace_event trace_blk_event = { |
1584 | .type = TRACE_BLK, | |
1585 | .funcs = &trace_blk_event_funcs, | |
1586 | }; | |
1587 | ||
c71a8961 ACM |
1588 | static int __init init_blk_tracer(void) |
1589 | { | |
9023c930 | 1590 | if (!register_trace_event(&trace_blk_event)) { |
a395d6a7 | 1591 | pr_warn("Warning: could not register block events\n"); |
c71a8961 ACM |
1592 | return 1; |
1593 | } | |
1594 | ||
1595 | if (register_tracer(&blk_tracer) != 0) { | |
a395d6a7 | 1596 | pr_warn("Warning: could not register the block tracer\n"); |
9023c930 | 1597 | unregister_trace_event(&trace_blk_event); |
c71a8961 ACM |
1598 | return 1; |
1599 | } | |
1600 | ||
1601 | return 0; | |
1602 | } | |
1603 | ||
1604 | device_initcall(init_blk_tracer); | |
1605 | ||
1606 | static int blk_trace_remove_queue(struct request_queue *q) | |
1607 | { | |
1608 | struct blk_trace *bt; | |
1609 | ||
c3dbe541 | 1610 | bt = rcu_replace_pointer(q->blk_trace, NULL, |
85e0cbbb | 1611 | lockdep_is_held(&q->debugfs_mutex)); |
c71a8961 ACM |
1612 | if (bt == NULL) |
1613 | return -EINVAL; | |
1614 | ||
60a9bb90 | 1615 | blk_trace_stop(bt); |
5afedf67 | 1616 | |
a6da0024 | 1617 | put_probe_ref(); |
c780e86d | 1618 | synchronize_rcu(); |
30939293 | 1619 | blk_trace_free(q, bt); |
c71a8961 ACM |
1620 | return 0; |
1621 | } | |
1622 | ||
1623 | /* | |
1624 | * Setup everything required to start tracing | |
1625 | */ | |
9908c309 LZ |
1626 | static int blk_trace_setup_queue(struct request_queue *q, |
1627 | struct block_device *bdev) | |
c71a8961 | 1628 | { |
cdea01b2 | 1629 | struct blk_trace *bt = NULL; |
18cea459 | 1630 | int ret = -ENOMEM; |
c71a8961 | 1631 | |
c71a8961 ACM |
1632 | bt = kzalloc(sizeof(*bt), GFP_KERNEL); |
1633 | if (!bt) | |
15152e44 | 1634 | return -ENOMEM; |
c71a8961 | 1635 | |
18cea459 LZ |
1636 | bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); |
1637 | if (!bt->msg_data) | |
1638 | goto free_bt; | |
1639 | ||
9908c309 | 1640 | bt->dev = bdev->bd_dev; |
c71a8961 | 1641 | bt->act_mask = (u16)-1; |
9908c309 LZ |
1642 | |
1643 | blk_trace_setup_lba(bt, bdev); | |
c71a8961 | 1644 | |
c3dbe541 | 1645 | rcu_assign_pointer(q->blk_trace, bt); |
a6da0024 | 1646 | get_probe_ref(); |
c71a8961 | 1647 | return 0; |
18cea459 LZ |
1648 | |
1649 | free_bt: | |
30939293 | 1650 | blk_trace_free(q, bt); |
18cea459 | 1651 | return ret; |
c71a8961 ACM |
1652 | } |
1653 | ||
1654 | /* | |
1655 | * sysfs interface to enable and configure tracing | |
1656 | */ | |
1657 | ||
c71a8961 ACM |
1658 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, |
1659 | struct device_attribute *attr, | |
1660 | char *buf); | |
1661 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | |
1662 | struct device_attribute *attr, | |
1663 | const char *buf, size_t count); | |
1664 | #define BLK_TRACE_DEVICE_ATTR(_name) \ | |
1665 | DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ | |
1666 | sysfs_blk_trace_attr_show, \ | |
1667 | sysfs_blk_trace_attr_store) | |
1668 | ||
cd649b8b | 1669 | static BLK_TRACE_DEVICE_ATTR(enable); |
c71a8961 ACM |
1670 | static BLK_TRACE_DEVICE_ATTR(act_mask); |
1671 | static BLK_TRACE_DEVICE_ATTR(pid); | |
1672 | static BLK_TRACE_DEVICE_ATTR(start_lba); | |
1673 | static BLK_TRACE_DEVICE_ATTR(end_lba); | |
1674 | ||
1675 | static struct attribute *blk_trace_attrs[] = { | |
1676 | &dev_attr_enable.attr, | |
1677 | &dev_attr_act_mask.attr, | |
1678 | &dev_attr_pid.attr, | |
1679 | &dev_attr_start_lba.attr, | |
1680 | &dev_attr_end_lba.attr, | |
1681 | NULL | |
1682 | }; | |
1683 | ||
1684 | struct attribute_group blk_trace_attr_group = { | |
1685 | .name = "trace", | |
1686 | .attrs = blk_trace_attrs, | |
1687 | }; | |
1688 | ||
09341997 LZ |
1689 | static const struct { |
1690 | int mask; | |
1691 | const char *str; | |
1692 | } mask_maps[] = { | |
1693 | { BLK_TC_READ, "read" }, | |
1694 | { BLK_TC_WRITE, "write" }, | |
c09c47ca | 1695 | { BLK_TC_FLUSH, "flush" }, |
09341997 LZ |
1696 | { BLK_TC_SYNC, "sync" }, |
1697 | { BLK_TC_QUEUE, "queue" }, | |
1698 | { BLK_TC_REQUEUE, "requeue" }, | |
1699 | { BLK_TC_ISSUE, "issue" }, | |
1700 | { BLK_TC_COMPLETE, "complete" }, | |
1701 | { BLK_TC_FS, "fs" }, | |
1702 | { BLK_TC_PC, "pc" }, | |
8d1547e0 | 1703 | { BLK_TC_NOTIFY, "notify" }, |
09341997 LZ |
1704 | { BLK_TC_AHEAD, "ahead" }, |
1705 | { BLK_TC_META, "meta" }, | |
1706 | { BLK_TC_DISCARD, "discard" }, | |
1707 | { BLK_TC_DRV_DATA, "drv_data" }, | |
c09c47ca | 1708 | { BLK_TC_FUA, "fua" }, |
09341997 LZ |
1709 | }; |
1710 | ||
1711 | static int blk_trace_str2mask(const char *str) | |
c71a8961 | 1712 | { |
09341997 | 1713 | int i; |
c71a8961 | 1714 | int mask = 0; |
9eb85125 | 1715 | char *buf, *s, *token; |
c71a8961 | 1716 | |
9eb85125 LZ |
1717 | buf = kstrdup(str, GFP_KERNEL); |
1718 | if (buf == NULL) | |
c71a8961 | 1719 | return -ENOMEM; |
9eb85125 | 1720 | s = strstrip(buf); |
c71a8961 ACM |
1721 | |
1722 | while (1) { | |
09341997 LZ |
1723 | token = strsep(&s, ","); |
1724 | if (token == NULL) | |
c71a8961 ACM |
1725 | break; |
1726 | ||
09341997 LZ |
1727 | if (*token == '\0') |
1728 | continue; | |
1729 | ||
1730 | for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { | |
1731 | if (strcasecmp(token, mask_maps[i].str) == 0) { | |
1732 | mask |= mask_maps[i].mask; | |
1733 | break; | |
1734 | } | |
1735 | } | |
1736 | if (i == ARRAY_SIZE(mask_maps)) { | |
1737 | mask = -EINVAL; | |
1738 | break; | |
1739 | } | |
c71a8961 | 1740 | } |
9eb85125 | 1741 | kfree(buf); |
c71a8961 ACM |
1742 | |
1743 | return mask; | |
1744 | } | |
1745 | ||
09341997 LZ |
1746 | static ssize_t blk_trace_mask2str(char *buf, int mask) |
1747 | { | |
1748 | int i; | |
1749 | char *p = buf; | |
1750 | ||
1751 | for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { | |
1752 | if (mask & mask_maps[i].mask) { | |
1753 | p += sprintf(p, "%s%s", | |
1754 | (p == buf) ? "" : ",", mask_maps[i].str); | |
1755 | } | |
1756 | } | |
1757 | *p++ = '\n'; | |
1758 | ||
1759 | return p - buf; | |
1760 | } | |
1761 | ||
c71a8961 ACM |
1762 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, |
1763 | struct device_attribute *attr, | |
1764 | char *buf) | |
1765 | { | |
0d02129e CH |
1766 | struct block_device *bdev = dev_to_bdev(dev); |
1767 | struct request_queue *q = bdev_get_queue(bdev); | |
c780e86d | 1768 | struct blk_trace *bt; |
c71a8961 ACM |
1769 | ssize_t ret = -ENXIO; |
1770 | ||
85e0cbbb | 1771 | mutex_lock(&q->debugfs_mutex); |
cd649b8b | 1772 | |
c780e86d | 1773 | bt = rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 1774 | lockdep_is_held(&q->debugfs_mutex)); |
cd649b8b | 1775 | if (attr == &dev_attr_enable) { |
c780e86d | 1776 | ret = sprintf(buf, "%u\n", !!bt); |
cd649b8b LZ |
1777 | goto out_unlock_bdev; |
1778 | } | |
1779 | ||
c780e86d | 1780 | if (bt == NULL) |
c71a8961 ACM |
1781 | ret = sprintf(buf, "disabled\n"); |
1782 | else if (attr == &dev_attr_act_mask) | |
c780e86d | 1783 | ret = blk_trace_mask2str(buf, bt->act_mask); |
c71a8961 | 1784 | else if (attr == &dev_attr_pid) |
c780e86d | 1785 | ret = sprintf(buf, "%u\n", bt->pid); |
c71a8961 | 1786 | else if (attr == &dev_attr_start_lba) |
c780e86d | 1787 | ret = sprintf(buf, "%llu\n", bt->start_lba); |
c71a8961 | 1788 | else if (attr == &dev_attr_end_lba) |
c780e86d | 1789 | ret = sprintf(buf, "%llu\n", bt->end_lba); |
cd649b8b LZ |
1790 | |
1791 | out_unlock_bdev: | |
85e0cbbb | 1792 | mutex_unlock(&q->debugfs_mutex); |
c71a8961 ACM |
1793 | return ret; |
1794 | } | |
1795 | ||
1796 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | |
1797 | struct device_attribute *attr, | |
1798 | const char *buf, size_t count) | |
1799 | { | |
0d02129e CH |
1800 | struct block_device *bdev = dev_to_bdev(dev); |
1801 | struct request_queue *q = bdev_get_queue(bdev); | |
c780e86d | 1802 | struct blk_trace *bt; |
c71a8961 | 1803 | u64 value; |
09341997 | 1804 | ssize_t ret = -EINVAL; |
c71a8961 ACM |
1805 | |
1806 | if (count == 0) | |
1807 | goto out; | |
1808 | ||
1809 | if (attr == &dev_attr_act_mask) { | |
5f339453 | 1810 | if (kstrtoull(buf, 0, &value)) { |
c71a8961 | 1811 | /* Assume it is a list of trace category names */ |
09341997 LZ |
1812 | ret = blk_trace_str2mask(buf); |
1813 | if (ret < 0) | |
c71a8961 | 1814 | goto out; |
09341997 | 1815 | value = ret; |
c71a8961 | 1816 | } |
0d02129e CH |
1817 | } else { |
1818 | if (kstrtoull(buf, 0, &value)) | |
1819 | goto out; | |
1820 | } | |
c71a8961 | 1821 | |
85e0cbbb | 1822 | mutex_lock(&q->debugfs_mutex); |
cd649b8b | 1823 | |
c780e86d | 1824 | bt = rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 1825 | lockdep_is_held(&q->debugfs_mutex)); |
cd649b8b | 1826 | if (attr == &dev_attr_enable) { |
c780e86d | 1827 | if (!!value == !!bt) { |
757d9140 SRV |
1828 | ret = 0; |
1829 | goto out_unlock_bdev; | |
1830 | } | |
cd649b8b | 1831 | if (value) |
9908c309 | 1832 | ret = blk_trace_setup_queue(q, bdev); |
cd649b8b LZ |
1833 | else |
1834 | ret = blk_trace_remove_queue(q); | |
1835 | goto out_unlock_bdev; | |
1836 | } | |
1837 | ||
c71a8961 | 1838 | ret = 0; |
153031a3 | 1839 | if (bt == NULL) { |
9908c309 | 1840 | ret = blk_trace_setup_queue(q, bdev); |
153031a3 | 1841 | bt = rcu_dereference_protected(q->blk_trace, |
85e0cbbb | 1842 | lockdep_is_held(&q->debugfs_mutex)); |
153031a3 | 1843 | } |
c71a8961 ACM |
1844 | |
1845 | if (ret == 0) { | |
1846 | if (attr == &dev_attr_act_mask) | |
c780e86d | 1847 | bt->act_mask = value; |
c71a8961 | 1848 | else if (attr == &dev_attr_pid) |
c780e86d | 1849 | bt->pid = value; |
c71a8961 | 1850 | else if (attr == &dev_attr_start_lba) |
c780e86d | 1851 | bt->start_lba = value; |
c71a8961 | 1852 | else if (attr == &dev_attr_end_lba) |
c780e86d | 1853 | bt->end_lba = value; |
c71a8961 | 1854 | } |
cd649b8b LZ |
1855 | |
1856 | out_unlock_bdev: | |
85e0cbbb | 1857 | mutex_unlock(&q->debugfs_mutex); |
c71a8961 | 1858 | out: |
cd649b8b | 1859 | return ret ? ret : count; |
c71a8961 | 1860 | } |
55782138 LZ |
1861 | #endif /* CONFIG_BLK_DEV_IO_TRACE */ |
1862 | ||
1863 | #ifdef CONFIG_EVENT_TRACING | |
1864 | ||
1f83bb4b CK |
1865 | /** |
1866 | * blk_fill_rwbs - Fill the buffer rwbs by mapping op to character string. | |
94d4bffd | 1867 | * @rwbs: buffer to be filled |
020e3618 | 1868 | * @opf: request operation type (REQ_OP_XXX) and flags for the tracepoint |
1f83bb4b CK |
1869 | * |
1870 | * Description: | |
020e3618 BVA |
1871 | * Maps each request operation and flag to a single character and fills the |
1872 | * buffer provided by the caller with resulting string. | |
1f83bb4b CK |
1873 | * |
1874 | **/ | |
919dbca8 | 1875 | void blk_fill_rwbs(char *rwbs, blk_opf_t opf) |
55782138 LZ |
1876 | { |
1877 | int i = 0; | |
1878 | ||
919dbca8 | 1879 | if (opf & REQ_PREFLUSH) |
c09c47ca NK |
1880 | rwbs[i++] = 'F'; |
1881 | ||
919dbca8 | 1882 | switch (opf & REQ_OP_MASK) { |
1b9a9ab7 | 1883 | case REQ_OP_WRITE: |
55782138 | 1884 | rwbs[i++] = 'W'; |
1b9a9ab7 MC |
1885 | break; |
1886 | case REQ_OP_DISCARD: | |
55782138 | 1887 | rwbs[i++] = 'D'; |
1b9a9ab7 | 1888 | break; |
288dab8a CH |
1889 | case REQ_OP_SECURE_ERASE: |
1890 | rwbs[i++] = 'D'; | |
1891 | rwbs[i++] = 'E'; | |
1892 | break; | |
3a5e02ce MC |
1893 | case REQ_OP_FLUSH: |
1894 | rwbs[i++] = 'F'; | |
1895 | break; | |
1b9a9ab7 | 1896 | case REQ_OP_READ: |
55782138 | 1897 | rwbs[i++] = 'R'; |
1b9a9ab7 MC |
1898 | break; |
1899 | default: | |
55782138 | 1900 | rwbs[i++] = 'N'; |
1b9a9ab7 | 1901 | } |
55782138 | 1902 | |
919dbca8 | 1903 | if (opf & REQ_FUA) |
c09c47ca | 1904 | rwbs[i++] = 'F'; |
919dbca8 | 1905 | if (opf & REQ_RAHEAD) |
55782138 | 1906 | rwbs[i++] = 'A'; |
919dbca8 | 1907 | if (opf & REQ_SYNC) |
55782138 | 1908 | rwbs[i++] = 'S'; |
919dbca8 | 1909 | if (opf & REQ_META) |
55782138 LZ |
1910 | rwbs[i++] = 'M'; |
1911 | ||
1912 | rwbs[i] = '\0'; | |
1913 | } | |
9ca8f8e5 | 1914 | EXPORT_SYMBOL_GPL(blk_fill_rwbs); |
55782138 | 1915 | |
55782138 LZ |
1916 | #endif /* CONFIG_EVENT_TRACING */ |
1917 |