2 * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 #include <linux/kernel.h>
19 #include <linux/blkdev.h>
20 #include <linux/blktrace_api.h>
21 #include <linux/percpu.h>
22 #include <linux/init.h>
23 #include <linux/mutex.h>
24 #include <linux/slab.h>
25 #include <linux/debugfs.h>
26 #include <linux/export.h>
27 #include <linux/time.h>
28 #include <linux/uaccess.h>
30 #include <trace/events/block.h>
32 #include "trace_output.h"
34 #ifdef CONFIG_BLK_DEV_IO_TRACE
36 static unsigned int blktrace_seq __read_mostly = 1;
38 static struct trace_array *blk_tr;
39 static bool blk_tracer_enabled __read_mostly;
41 /* Select an alternative, minimalistic output than the original one */
42 #define TRACE_BLK_OPT_CLASSIC 0x1
44 static struct tracer_opt blk_tracer_opts[] = {
45 /* Default disable the minimalistic output */
46 { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) },
50 static struct tracer_flags blk_tracer_flags = {
52 .opts = blk_tracer_opts,
55 /* Global reference count of probes */
56 static atomic_t blk_probes_ref = ATOMIC_INIT(0);
58 static void blk_register_tracepoints(void);
59 static void blk_unregister_tracepoints(void);
62 * Send out a notify message.
64 static void trace_note(struct blk_trace *bt, pid_t pid, int action,
65 const void *data, size_t len)
67 struct blk_io_trace *t;
68 struct ring_buffer_event *event = NULL;
69 struct ring_buffer *buffer = NULL;
71 int cpu = smp_processor_id();
72 bool blk_tracer = blk_tracer_enabled;
75 buffer = blk_tr->buffer;
77 event = trace_buffer_lock_reserve(buffer, TRACE_BLK,
82 t = ring_buffer_event_data(event);
89 t = relay_reserve(bt->rchan, sizeof(*t) + len);
91 t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
92 t->time = ktime_to_ns(ktime_get());
99 memcpy((void *) t + sizeof(*t), data, len);
102 trace_buffer_unlock_commit(buffer, event, 0, pc);
107 * Send out a notify for this process, if we haven't done so since a trace
110 static void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk)
112 tsk->btrace_seq = blktrace_seq;
113 trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm));
116 static void trace_note_time(struct blk_trace *bt)
122 getnstimeofday(&now);
123 words[0] = now.tv_sec;
124 words[1] = now.tv_nsec;
126 local_irq_save(flags);
127 trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words));
128 local_irq_restore(flags);
131 void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
138 if (unlikely(bt->trace_state != Blktrace_running &&
139 !blk_tracer_enabled))
143 * If the BLK_TC_NOTIFY action mask isn't set, don't send any note
144 * message to the trace.
146 if (!(bt->act_mask & BLK_TC_NOTIFY))
149 local_irq_save(flags);
150 buf = per_cpu_ptr(bt->msg_data, smp_processor_id());
152 n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args);
155 trace_note(bt, 0, BLK_TN_MESSAGE, buf, n);
156 local_irq_restore(flags);
158 EXPORT_SYMBOL_GPL(__trace_note_message);
160 static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
163 if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
165 if (sector && (sector < bt->start_lba || sector > bt->end_lba))
167 if (bt->pid && pid != bt->pid)
174 * Data direction bit lookup
176 static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ),
177 BLK_TC_ACT(BLK_TC_WRITE) };
179 #define BLK_TC_RAHEAD BLK_TC_AHEAD
181 /* The ilog2() calls fall out because they're constant */
182 #define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \
183 (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name))
186 * The worker for the various blk_add_trace*() types. Fills out a
187 * blk_io_trace structure and places it in a per-cpu subbuffer.
189 static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
190 int rw, u32 what, int error, int pdu_len, void *pdu_data)
192 struct task_struct *tsk = current;
193 struct ring_buffer_event *event = NULL;
194 struct ring_buffer *buffer = NULL;
195 struct blk_io_trace *t;
196 unsigned long flags = 0;
197 unsigned long *sequence;
200 bool blk_tracer = blk_tracer_enabled;
202 if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer))
205 what |= ddir_act[rw & WRITE];
206 what |= MASK_TC_BIT(rw, SYNC);
207 what |= MASK_TC_BIT(rw, RAHEAD);
208 what |= MASK_TC_BIT(rw, META);
209 what |= MASK_TC_BIT(rw, DISCARD);
210 what |= MASK_TC_BIT(rw, FLUSH);
211 what |= MASK_TC_BIT(rw, FUA);
214 if (act_log_check(bt, what, sector, pid))
216 cpu = raw_smp_processor_id();
219 tracing_record_cmdline(current);
221 buffer = blk_tr->buffer;
222 pc = preempt_count();
223 event = trace_buffer_lock_reserve(buffer, TRACE_BLK,
224 sizeof(*t) + pdu_len,
228 t = ring_buffer_event_data(event);
233 * A word about the locking here - we disable interrupts to reserve
234 * some space in the relay per-cpu buffer, to prevent an irq
235 * from coming in and stepping on our toes.
237 local_irq_save(flags);
239 if (unlikely(tsk->btrace_seq != blktrace_seq))
240 trace_note_tsk(bt, tsk);
242 t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len);
244 sequence = per_cpu_ptr(bt->sequence, cpu);
246 t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
247 t->sequence = ++(*sequence);
248 t->time = ktime_to_ns(ktime_get());
251 * These two are not needed in ftrace as they are in the
252 * generic trace_entry, filled by tracing_generic_entry_update,
253 * but for the trace_event->bin() synthesizer benefit we do it
264 t->pdu_len = pdu_len;
267 memcpy((void *) t + sizeof(*t), pdu_data, pdu_len);
270 trace_buffer_unlock_commit(buffer, event, 0, pc);
275 local_irq_restore(flags);
278 static struct dentry *blk_tree_root;
279 static DEFINE_MUTEX(blk_tree_mutex);
281 static void blk_trace_free(struct blk_trace *bt)
283 debugfs_remove(bt->msg_file);
284 debugfs_remove(bt->dropped_file);
285 relay_close(bt->rchan);
286 debugfs_remove(bt->dir);
287 free_percpu(bt->sequence);
288 free_percpu(bt->msg_data);
292 static void blk_trace_cleanup(struct blk_trace *bt)
295 if (atomic_dec_and_test(&blk_probes_ref))
296 blk_unregister_tracepoints();
299 static int __blk_trace_remove(struct request_queue *q)
301 struct blk_trace *bt;
303 bt = xchg(&q->blk_trace, NULL);
307 if (bt->trace_state != Blktrace_running)
308 blk_trace_cleanup(bt);
313 int blk_trace_remove(struct request_queue *q)
317 mutex_lock(&q->blk_trace_mutex);
318 ret = __blk_trace_remove(q);
319 mutex_unlock(&q->blk_trace_mutex);
323 EXPORT_SYMBOL_GPL(blk_trace_remove);
325 static int blk_dropped_open(struct inode *inode, struct file *filp)
327 filp->private_data = inode->i_private;
332 static ssize_t blk_dropped_read(struct file *filp, char __user *buffer,
333 size_t count, loff_t *ppos)
335 struct blk_trace *bt = filp->private_data;
338 snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped));
340 return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
343 static const struct file_operations blk_dropped_fops = {
344 .owner = THIS_MODULE,
345 .open = blk_dropped_open,
346 .read = blk_dropped_read,
347 .llseek = default_llseek,
350 static int blk_msg_open(struct inode *inode, struct file *filp)
352 filp->private_data = inode->i_private;
357 static ssize_t blk_msg_write(struct file *filp, const char __user *buffer,
358 size_t count, loff_t *ppos)
361 struct blk_trace *bt;
363 if (count >= BLK_TN_MAX_MSG)
366 msg = kmalloc(count + 1, GFP_KERNEL);
370 if (copy_from_user(msg, buffer, count)) {
376 bt = filp->private_data;
377 __trace_note_message(bt, "%s", msg);
383 static const struct file_operations blk_msg_fops = {
384 .owner = THIS_MODULE,
385 .open = blk_msg_open,
386 .write = blk_msg_write,
387 .llseek = noop_llseek,
391 * Keep track of how many times we encountered a full subbuffer, to aid
392 * the user space app in telling how many lost events there were.
394 static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf,
395 void *prev_subbuf, size_t prev_padding)
397 struct blk_trace *bt;
399 if (!relay_buf_full(buf))
402 bt = buf->chan->private_data;
403 atomic_inc(&bt->dropped);
407 static int blk_remove_buf_file_callback(struct dentry *dentry)
409 debugfs_remove(dentry);
414 static struct dentry *blk_create_buf_file_callback(const char *filename,
415 struct dentry *parent,
417 struct rchan_buf *buf,
420 return debugfs_create_file(filename, mode, parent, buf,
421 &relay_file_operations);
424 static struct rchan_callbacks blk_relay_callbacks = {
425 .subbuf_start = blk_subbuf_start_callback,
426 .create_buf_file = blk_create_buf_file_callback,
427 .remove_buf_file = blk_remove_buf_file_callback,
430 static void blk_trace_setup_lba(struct blk_trace *bt,
431 struct block_device *bdev)
433 struct hd_struct *part = NULL;
436 part = bdev->bd_part;
439 bt->start_lba = part->start_sect;
440 bt->end_lba = part->start_sect + part->nr_sects;
448 * Setup everything required to start tracing
450 int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
451 struct block_device *bdev,
452 struct blk_user_trace_setup *buts)
454 struct blk_trace *old_bt, *bt = NULL;
455 struct dentry *dir = NULL;
458 if (!buts->buf_size || !buts->buf_nr)
461 strncpy(buts->name, name, BLKTRACE_BDEV_SIZE);
462 buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0';
465 * some device names have larger paths - convert the slashes
466 * to underscores for this to work as expected
468 for (i = 0; i < strlen(buts->name); i++)
469 if (buts->name[i] == '/')
472 bt = kzalloc(sizeof(*bt), GFP_KERNEL);
477 bt->sequence = alloc_percpu(unsigned long);
481 bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char));
487 mutex_lock(&blk_tree_mutex);
488 if (!blk_tree_root) {
489 blk_tree_root = debugfs_create_dir("block", NULL);
490 if (!blk_tree_root) {
491 mutex_unlock(&blk_tree_mutex);
495 mutex_unlock(&blk_tree_mutex);
497 dir = debugfs_create_dir(buts->name, blk_tree_root);
504 atomic_set(&bt->dropped, 0);
507 bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt,
509 if (!bt->dropped_file)
512 bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops);
516 bt->rchan = relay_open("trace", dir, buts->buf_size,
517 buts->buf_nr, &blk_relay_callbacks, bt);
521 bt->act_mask = buts->act_mask;
523 bt->act_mask = (u16) -1;
525 blk_trace_setup_lba(bt, bdev);
527 /* overwrite with user settings */
529 bt->start_lba = buts->start_lba;
531 bt->end_lba = buts->end_lba;
534 bt->trace_state = Blktrace_setup;
537 old_bt = xchg(&q->blk_trace, bt);
539 (void) xchg(&q->blk_trace, old_bt);
543 if (atomic_inc_return(&blk_probes_ref) == 1)
544 blk_register_tracepoints();
552 static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
553 struct block_device *bdev, char __user *arg)
555 struct blk_user_trace_setup buts;
558 ret = copy_from_user(&buts, arg, sizeof(buts));
562 ret = do_blk_trace_setup(q, name, dev, bdev, &buts);
566 if (copy_to_user(arg, &buts, sizeof(buts))) {
573 int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
574 struct block_device *bdev,
579 mutex_lock(&q->blk_trace_mutex);
580 ret = __blk_trace_setup(q, name, dev, bdev, arg);
581 mutex_unlock(&q->blk_trace_mutex);
585 EXPORT_SYMBOL_GPL(blk_trace_setup);
587 #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
588 static int compat_blk_trace_setup(struct request_queue *q, char *name,
589 dev_t dev, struct block_device *bdev,
592 struct blk_user_trace_setup buts;
593 struct compat_blk_user_trace_setup cbuts;
596 if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
599 buts = (struct blk_user_trace_setup) {
600 .act_mask = cbuts.act_mask,
601 .buf_size = cbuts.buf_size,
602 .buf_nr = cbuts.buf_nr,
603 .start_lba = cbuts.start_lba,
604 .end_lba = cbuts.end_lba,
607 memcpy(&buts.name, &cbuts.name, 32);
609 ret = do_blk_trace_setup(q, name, dev, bdev, &buts);
613 if (copy_to_user(arg, &buts.name, 32)) {
622 static int __blk_trace_startstop(struct request_queue *q, int start)
625 struct blk_trace *bt = q->blk_trace;
631 * For starting a trace, we can transition from a setup or stopped
632 * trace. For stopping a trace, the state must be running
636 if (bt->trace_state == Blktrace_setup ||
637 bt->trace_state == Blktrace_stopped) {
640 bt->trace_state = Blktrace_running;
646 if (bt->trace_state == Blktrace_running) {
647 bt->trace_state = Blktrace_stopped;
648 relay_flush(bt->rchan);
656 int blk_trace_startstop(struct request_queue *q, int start)
660 mutex_lock(&q->blk_trace_mutex);
661 ret = __blk_trace_startstop(q, start);
662 mutex_unlock(&q->blk_trace_mutex);
666 EXPORT_SYMBOL_GPL(blk_trace_startstop);
669 * When reading or writing the blktrace sysfs files, the references to the
670 * opened sysfs or device files should prevent the underlying block device
671 * from being removed. So no further delete protection is really needed.
675 * blk_trace_ioctl: - handle the ioctls associated with tracing
676 * @bdev: the block device
677 * @cmd: the ioctl cmd
678 * @arg: the argument data, if any
681 int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
683 struct request_queue *q;
685 char b[BDEVNAME_SIZE];
687 q = bdev_get_queue(bdev);
691 mutex_lock(&q->blk_trace_mutex);
696 ret = __blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
698 #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
699 case BLKTRACESETUP32:
701 ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
707 ret = __blk_trace_startstop(q, start);
709 case BLKTRACETEARDOWN:
710 ret = __blk_trace_remove(q);
717 mutex_unlock(&q->blk_trace_mutex);
722 * blk_trace_shutdown: - stop and cleanup trace structures
723 * @q: the request queue associated with the device
726 void blk_trace_shutdown(struct request_queue *q)
728 mutex_lock(&q->blk_trace_mutex);
731 __blk_trace_startstop(q, 0);
732 __blk_trace_remove(q);
735 mutex_unlock(&q->blk_trace_mutex);
743 * blk_add_trace_rq - Add a trace for a request oriented action
744 * @q: queue the io is for
745 * @rq: the source request
746 * @nr_bytes: number of completed bytes
750 * Records an action against a request. Will log the bio offset + size.
753 static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
754 unsigned int nr_bytes, u32 what)
756 struct blk_trace *bt = q->blk_trace;
761 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
762 what |= BLK_TC_ACT(BLK_TC_PC);
763 __blk_add_trace(bt, 0, nr_bytes, rq->cmd_flags,
764 what, rq->errors, rq->cmd_len, rq->cmd);
766 what |= BLK_TC_ACT(BLK_TC_FS);
767 __blk_add_trace(bt, blk_rq_pos(rq), nr_bytes,
768 rq->cmd_flags, what, rq->errors, 0, NULL);
772 static void blk_add_trace_rq_abort(void *ignore,
773 struct request_queue *q, struct request *rq)
775 blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_ABORT);
778 static void blk_add_trace_rq_insert(void *ignore,
779 struct request_queue *q, struct request *rq)
781 blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_INSERT);
784 static void blk_add_trace_rq_issue(void *ignore,
785 struct request_queue *q, struct request *rq)
787 blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_ISSUE);
790 static void blk_add_trace_rq_requeue(void *ignore,
791 struct request_queue *q,
794 blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_REQUEUE);
797 static void blk_add_trace_rq_complete(void *ignore,
798 struct request_queue *q,
800 unsigned int nr_bytes)
802 blk_add_trace_rq(q, rq, nr_bytes, BLK_TA_COMPLETE);
806 * blk_add_trace_bio - Add a trace for a bio oriented action
807 * @q: queue the io is for
808 * @bio: the source bio
810 * @error: error, if any
813 * Records an action against a bio. Will log the bio offset + size.
816 static void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
819 struct blk_trace *bt = q->blk_trace;
824 if (!error && !bio_flagged(bio, BIO_UPTODATE))
827 __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what,
831 static void blk_add_trace_bio_bounce(void *ignore,
832 struct request_queue *q, struct bio *bio)
834 blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0);
837 static void blk_add_trace_bio_complete(void *ignore,
838 struct request_queue *q, struct bio *bio,
841 blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error);
844 static void blk_add_trace_bio_backmerge(void *ignore,
845 struct request_queue *q,
848 blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0);
851 static void blk_add_trace_bio_frontmerge(void *ignore,
852 struct request_queue *q,
855 blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0);
858 static void blk_add_trace_bio_queue(void *ignore,
859 struct request_queue *q, struct bio *bio)
861 blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0);
864 static void blk_add_trace_getrq(void *ignore,
865 struct request_queue *q,
866 struct bio *bio, int rw)
869 blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0);
871 struct blk_trace *bt = q->blk_trace;
874 __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL);
879 static void blk_add_trace_sleeprq(void *ignore,
880 struct request_queue *q,
881 struct bio *bio, int rw)
884 blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0);
886 struct blk_trace *bt = q->blk_trace;
889 __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ,
894 static void blk_add_trace_plug(void *ignore, struct request_queue *q)
896 struct blk_trace *bt = q->blk_trace;
899 __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL);
902 static void blk_add_trace_unplug(void *ignore, struct request_queue *q,
903 unsigned int depth, bool explicit)
905 struct blk_trace *bt = q->blk_trace;
908 __be64 rpdu = cpu_to_be64(depth);
912 what = BLK_TA_UNPLUG_IO;
914 what = BLK_TA_UNPLUG_TIMER;
916 __blk_add_trace(bt, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu);
920 static void blk_add_trace_split(void *ignore,
921 struct request_queue *q, struct bio *bio,
924 struct blk_trace *bt = q->blk_trace;
927 __be64 rpdu = cpu_to_be64(pdu);
929 __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw,
930 BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE),
931 sizeof(rpdu), &rpdu);
936 * blk_add_trace_bio_remap - Add a trace for a bio-remap operation
937 * @ignore: trace callback data parameter (not used)
938 * @q: queue the io is for
939 * @bio: the source bio
940 * @dev: target device
941 * @from: source sector
944 * Device mapper or raid target sometimes need to split a bio because
945 * it spans a stripe (or similar). Add a trace for that action.
948 static void blk_add_trace_bio_remap(void *ignore,
949 struct request_queue *q, struct bio *bio,
950 dev_t dev, sector_t from)
952 struct blk_trace *bt = q->blk_trace;
953 struct blk_io_trace_remap r;
958 r.device_from = cpu_to_be32(dev);
959 r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev);
960 r.sector_from = cpu_to_be64(from);
962 __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw,
963 BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE),
968 * blk_add_trace_rq_remap - Add a trace for a request-remap operation
969 * @ignore: trace callback data parameter (not used)
970 * @q: queue the io is for
971 * @rq: the source request
972 * @dev: target device
973 * @from: source sector
976 * Device mapper remaps request to other devices.
977 * Add a trace for that action.
980 static void blk_add_trace_rq_remap(void *ignore,
981 struct request_queue *q,
982 struct request *rq, dev_t dev,
985 struct blk_trace *bt = q->blk_trace;
986 struct blk_io_trace_remap r;
991 r.device_from = cpu_to_be32(dev);
992 r.device_to = cpu_to_be32(disk_devt(rq->rq_disk));
993 r.sector_from = cpu_to_be64(from);
995 __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq),
996 rq_data_dir(rq), BLK_TA_REMAP, !!rq->errors,
1001 * blk_add_driver_data - Add binary message with driver-specific data
1002 * @q: queue the io is for
1004 * @data: driver-specific data
1005 * @len: length of driver-specific data
1008 * Some drivers might want to write driver-specific data per request.
1011 void blk_add_driver_data(struct request_queue *q,
1013 void *data, size_t len)
1015 struct blk_trace *bt = q->blk_trace;
1020 if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
1021 __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0,
1022 BLK_TA_DRV_DATA, rq->errors, len, data);
1024 __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0,
1025 BLK_TA_DRV_DATA, rq->errors, len, data);
1027 EXPORT_SYMBOL_GPL(blk_add_driver_data);
1029 static void blk_register_tracepoints(void)
1033 ret = register_trace_block_rq_abort(blk_add_trace_rq_abort, NULL);
1035 ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL);
1037 ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL);
1039 ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL);
1041 ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL);
1043 ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL);
1045 ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL);
1047 ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL);
1049 ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL);
1051 ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL);
1053 ret = register_trace_block_getrq(blk_add_trace_getrq, NULL);
1055 ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL);
1057 ret = register_trace_block_plug(blk_add_trace_plug, NULL);
1059 ret = register_trace_block_unplug(blk_add_trace_unplug, NULL);
1061 ret = register_trace_block_split(blk_add_trace_split, NULL);
1063 ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL);
1065 ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL);
1069 static void blk_unregister_tracepoints(void)
1071 unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL);
1072 unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL);
1073 unregister_trace_block_split(blk_add_trace_split, NULL);
1074 unregister_trace_block_unplug(blk_add_trace_unplug, NULL);
1075 unregister_trace_block_plug(blk_add_trace_plug, NULL);
1076 unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL);
1077 unregister_trace_block_getrq(blk_add_trace_getrq, NULL);
1078 unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL);
1079 unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL);
1080 unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL);
1081 unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL);
1082 unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL);
1083 unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL);
1084 unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL);
1085 unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL);
1086 unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL);
1087 unregister_trace_block_rq_abort(blk_add_trace_rq_abort, NULL);
1089 tracepoint_synchronize_unregister();
1093 * struct blk_io_tracer formatting routines
1096 static void fill_rwbs(char *rwbs, const struct blk_io_trace *t)
1099 int tc = t->action >> BLK_TC_SHIFT;
1101 if (t->action == BLK_TN_MESSAGE) {
1106 if (tc & BLK_TC_FLUSH)
1109 if (tc & BLK_TC_DISCARD)
1111 else if (tc & BLK_TC_WRITE)
1118 if (tc & BLK_TC_FUA)
1120 if (tc & BLK_TC_AHEAD)
1122 if (tc & BLK_TC_SYNC)
1124 if (tc & BLK_TC_META)
1131 const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent)
1133 return (const struct blk_io_trace *)ent;
1136 static inline const void *pdu_start(const struct trace_entry *ent)
1138 return te_blk_io_trace(ent) + 1;
1141 static inline u32 t_action(const struct trace_entry *ent)
1143 return te_blk_io_trace(ent)->action;
1146 static inline u32 t_bytes(const struct trace_entry *ent)
1148 return te_blk_io_trace(ent)->bytes;
1151 static inline u32 t_sec(const struct trace_entry *ent)
1153 return te_blk_io_trace(ent)->bytes >> 9;
1156 static inline unsigned long long t_sector(const struct trace_entry *ent)
1158 return te_blk_io_trace(ent)->sector;
1161 static inline __u16 t_error(const struct trace_entry *ent)
1163 return te_blk_io_trace(ent)->error;
1166 static __u64 get_pdu_int(const struct trace_entry *ent)
1168 const __u64 *val = pdu_start(ent);
1169 return be64_to_cpu(*val);
1172 static void get_pdu_remap(const struct trace_entry *ent,
1173 struct blk_io_trace_remap *r)
1175 const struct blk_io_trace_remap *__r = pdu_start(ent);
1176 __u64 sector_from = __r->sector_from;
1178 r->device_from = be32_to_cpu(__r->device_from);
1179 r->device_to = be32_to_cpu(__r->device_to);
1180 r->sector_from = be64_to_cpu(sector_from);
1183 typedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act);
1185 static int blk_log_action_classic(struct trace_iterator *iter, const char *act)
1187 char rwbs[RWBS_LEN];
1188 unsigned long long ts = iter->ts;
1189 unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC);
1190 unsigned secs = (unsigned long)ts;
1191 const struct blk_io_trace *t = te_blk_io_trace(iter->ent);
1195 return trace_seq_printf(&iter->seq,
1196 "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ",
1197 MAJOR(t->device), MINOR(t->device), iter->cpu,
1198 secs, nsec_rem, iter->ent->pid, act, rwbs);
1201 static int blk_log_action(struct trace_iterator *iter, const char *act)
1203 char rwbs[RWBS_LEN];
1204 const struct blk_io_trace *t = te_blk_io_trace(iter->ent);
1207 return trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ",
1208 MAJOR(t->device), MINOR(t->device), act, rwbs);
1211 static int blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent)
1213 const unsigned char *pdu_buf;
1217 pdu_buf = pdu_start(ent);
1218 pdu_len = te_blk_io_trace(ent)->pdu_len;
1223 /* find the last zero that needs to be printed */
1224 for (end = pdu_len - 1; end >= 0; end--)
1229 if (!trace_seq_putc(s, '('))
1232 for (i = 0; i < pdu_len; i++) {
1234 ret = trace_seq_printf(s, "%s%02x",
1235 i == 0 ? "" : " ", pdu_buf[i]);
1240 * stop when the rest is just zeroes and indicate so
1241 * with a ".." appended
1243 if (i == end && end != pdu_len - 1)
1244 return trace_seq_puts(s, " ..) ");
1247 return trace_seq_puts(s, ") ");
1250 static int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent)
1252 char cmd[TASK_COMM_LEN];
1254 trace_find_cmdline(ent->pid, cmd);
1256 if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) {
1259 ret = trace_seq_printf(s, "%u ", t_bytes(ent));
1262 ret = blk_log_dump_pdu(s, ent);
1265 return trace_seq_printf(s, "[%s]\n", cmd);
1268 return trace_seq_printf(s, "%llu + %u [%s]\n",
1269 t_sector(ent), t_sec(ent), cmd);
1270 return trace_seq_printf(s, "[%s]\n", cmd);
1274 static int blk_log_with_error(struct trace_seq *s,
1275 const struct trace_entry *ent)
1277 if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) {
1280 ret = blk_log_dump_pdu(s, ent);
1282 return trace_seq_printf(s, "[%d]\n", t_error(ent));
1286 return trace_seq_printf(s, "%llu + %u [%d]\n",
1288 t_sec(ent), t_error(ent));
1289 return trace_seq_printf(s, "%llu [%d]\n",
1290 t_sector(ent), t_error(ent));
1294 static int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent)
1296 struct blk_io_trace_remap r = { .device_from = 0, };
1298 get_pdu_remap(ent, &r);
1299 return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n",
1300 t_sector(ent), t_sec(ent),
1301 MAJOR(r.device_from), MINOR(r.device_from),
1302 (unsigned long long)r.sector_from);
1305 static int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent)
1307 char cmd[TASK_COMM_LEN];
1309 trace_find_cmdline(ent->pid, cmd);
1311 return trace_seq_printf(s, "[%s]\n", cmd);
1314 static int blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent)
1316 char cmd[TASK_COMM_LEN];
1318 trace_find_cmdline(ent->pid, cmd);
1320 return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent));
1323 static int blk_log_split(struct trace_seq *s, const struct trace_entry *ent)
1325 char cmd[TASK_COMM_LEN];
1327 trace_find_cmdline(ent->pid, cmd);
1329 return trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent),
1330 get_pdu_int(ent), cmd);
1333 static int blk_log_msg(struct trace_seq *s, const struct trace_entry *ent)
1336 const struct blk_io_trace *t = te_blk_io_trace(ent);
1338 ret = trace_seq_putmem(s, t + 1, t->pdu_len);
1340 return trace_seq_putc(s, '\n');
1345 * struct tracer operations
1348 static void blk_tracer_print_header(struct seq_file *m)
1350 if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC))
1352 seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n"
1356 static void blk_tracer_start(struct trace_array *tr)
1358 blk_tracer_enabled = true;
1361 static int blk_tracer_init(struct trace_array *tr)
1364 blk_tracer_start(tr);
1368 static void blk_tracer_stop(struct trace_array *tr)
1370 blk_tracer_enabled = false;
1373 static void blk_tracer_reset(struct trace_array *tr)
1375 blk_tracer_stop(tr);
1378 static const struct {
1380 int (*print)(struct trace_seq *s, const struct trace_entry *ent);
1382 [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic },
1383 [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic },
1384 [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic },
1385 [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic },
1386 [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic },
1387 [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error },
1388 [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic },
1389 [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error },
1390 [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug },
1391 [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug },
1392 [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug },
1393 [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic },
1394 [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split },
1395 [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic },
1396 [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap },
1399 static enum print_line_t print_one_line(struct trace_iterator *iter,
1402 struct trace_seq *s = &iter->seq;
1403 const struct blk_io_trace *t;
1407 blk_log_action_t *log_action;
1409 t = te_blk_io_trace(iter->ent);
1410 what = t->action & ((1 << BLK_TC_SHIFT) - 1);
1411 long_act = !!(trace_flags & TRACE_ITER_VERBOSE);
1412 log_action = classic ? &blk_log_action_classic : &blk_log_action;
1414 if (t->action == BLK_TN_MESSAGE) {
1415 ret = log_action(iter, long_act ? "message" : "m");
1417 ret = blk_log_msg(s, iter->ent);
1421 if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))
1422 ret = trace_seq_printf(s, "Unknown action %x\n", what);
1424 ret = log_action(iter, what2act[what].act[long_act]);
1426 ret = what2act[what].print(s, iter->ent);
1429 return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
1432 static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
1433 int flags, struct trace_event *event)
1435 return print_one_line(iter, false);
1438 static int blk_trace_synthesize_old_trace(struct trace_iterator *iter)
1440 struct trace_seq *s = &iter->seq;
1441 struct blk_io_trace *t = (struct blk_io_trace *)iter->ent;
1442 const int offset = offsetof(struct blk_io_trace, sector);
1443 struct blk_io_trace old = {
1444 .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION,
1448 if (!trace_seq_putmem(s, &old, offset))
1450 return trace_seq_putmem(s, &t->sector,
1451 sizeof(old) - offset + t->pdu_len);
1454 static enum print_line_t
1455 blk_trace_event_print_binary(struct trace_iterator *iter, int flags,
1456 struct trace_event *event)
1458 return blk_trace_synthesize_old_trace(iter) ?
1459 TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
1462 static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter)
1464 if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC))
1465 return TRACE_TYPE_UNHANDLED;
1467 return print_one_line(iter, true);
1470 static int blk_tracer_set_flag(u32 old_flags, u32 bit, int set)
1472 /* don't output context-info for blk_classic output */
1473 if (bit == TRACE_BLK_OPT_CLASSIC) {
1475 trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
1477 trace_flags |= TRACE_ITER_CONTEXT_INFO;
1482 static struct tracer blk_tracer __read_mostly = {
1484 .init = blk_tracer_init,
1485 .reset = blk_tracer_reset,
1486 .start = blk_tracer_start,
1487 .stop = blk_tracer_stop,
1488 .print_header = blk_tracer_print_header,
1489 .print_line = blk_tracer_print_line,
1490 .flags = &blk_tracer_flags,
1491 .set_flag = blk_tracer_set_flag,
1494 static struct trace_event_functions trace_blk_event_funcs = {
1495 .trace = blk_trace_event_print,
1496 .binary = blk_trace_event_print_binary,
1499 static struct trace_event trace_blk_event = {
1501 .funcs = &trace_blk_event_funcs,
1504 static int __init init_blk_tracer(void)
1506 if (!register_ftrace_event(&trace_blk_event)) {
1507 pr_warning("Warning: could not register block events\n");
1511 if (register_tracer(&blk_tracer) != 0) {
1512 pr_warning("Warning: could not register the block tracer\n");
1513 unregister_ftrace_event(&trace_blk_event);
1520 device_initcall(init_blk_tracer);
1522 static int blk_trace_remove_queue(struct request_queue *q)
1524 struct blk_trace *bt;
1526 bt = xchg(&q->blk_trace, NULL);
1530 if (atomic_dec_and_test(&blk_probes_ref))
1531 blk_unregister_tracepoints();
1538 * Setup everything required to start tracing
1540 static int blk_trace_setup_queue(struct request_queue *q,
1541 struct block_device *bdev)
1543 struct blk_trace *old_bt, *bt = NULL;
1546 bt = kzalloc(sizeof(*bt), GFP_KERNEL);
1550 bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char));
1554 bt->dev = bdev->bd_dev;
1555 bt->act_mask = (u16)-1;
1557 blk_trace_setup_lba(bt, bdev);
1559 old_bt = xchg(&q->blk_trace, bt);
1560 if (old_bt != NULL) {
1561 (void)xchg(&q->blk_trace, old_bt);
1566 if (atomic_inc_return(&blk_probes_ref) == 1)
1567 blk_register_tracepoints();
1576 * sysfs interface to enable and configure tracing
1579 static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
1580 struct device_attribute *attr,
1582 static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
1583 struct device_attribute *attr,
1584 const char *buf, size_t count);
1585 #define BLK_TRACE_DEVICE_ATTR(_name) \
1586 DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \
1587 sysfs_blk_trace_attr_show, \
1588 sysfs_blk_trace_attr_store)
1590 static BLK_TRACE_DEVICE_ATTR(enable);
1591 static BLK_TRACE_DEVICE_ATTR(act_mask);
1592 static BLK_TRACE_DEVICE_ATTR(pid);
1593 static BLK_TRACE_DEVICE_ATTR(start_lba);
1594 static BLK_TRACE_DEVICE_ATTR(end_lba);
1596 static struct attribute *blk_trace_attrs[] = {
1597 &dev_attr_enable.attr,
1598 &dev_attr_act_mask.attr,
1600 &dev_attr_start_lba.attr,
1601 &dev_attr_end_lba.attr,
1605 struct attribute_group blk_trace_attr_group = {
1607 .attrs = blk_trace_attrs,
1610 static const struct {
1614 { BLK_TC_READ, "read" },
1615 { BLK_TC_WRITE, "write" },
1616 { BLK_TC_FLUSH, "flush" },
1617 { BLK_TC_SYNC, "sync" },
1618 { BLK_TC_QUEUE, "queue" },
1619 { BLK_TC_REQUEUE, "requeue" },
1620 { BLK_TC_ISSUE, "issue" },
1621 { BLK_TC_COMPLETE, "complete" },
1622 { BLK_TC_FS, "fs" },
1623 { BLK_TC_PC, "pc" },
1624 { BLK_TC_AHEAD, "ahead" },
1625 { BLK_TC_META, "meta" },
1626 { BLK_TC_DISCARD, "discard" },
1627 { BLK_TC_DRV_DATA, "drv_data" },
1628 { BLK_TC_FUA, "fua" },
1631 static int blk_trace_str2mask(const char *str)
1635 char *buf, *s, *token;
1637 buf = kstrdup(str, GFP_KERNEL);
1643 token = strsep(&s, ",");
1650 for (i = 0; i < ARRAY_SIZE(mask_maps); i++) {
1651 if (strcasecmp(token, mask_maps[i].str) == 0) {
1652 mask |= mask_maps[i].mask;
1656 if (i == ARRAY_SIZE(mask_maps)) {
1666 static ssize_t blk_trace_mask2str(char *buf, int mask)
1671 for (i = 0; i < ARRAY_SIZE(mask_maps); i++) {
1672 if (mask & mask_maps[i].mask) {
1673 p += sprintf(p, "%s%s",
1674 (p == buf) ? "" : ",", mask_maps[i].str);
1682 static struct request_queue *blk_trace_get_queue(struct block_device *bdev)
1684 if (bdev->bd_disk == NULL)
1687 return bdev_get_queue(bdev);
1690 static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
1691 struct device_attribute *attr,
1694 struct hd_struct *p = dev_to_part(dev);
1695 struct request_queue *q;
1696 struct block_device *bdev;
1697 ssize_t ret = -ENXIO;
1699 bdev = bdget(part_devt(p));
1703 q = blk_trace_get_queue(bdev);
1707 mutex_lock(&q->blk_trace_mutex);
1709 if (attr == &dev_attr_enable) {
1710 ret = sprintf(buf, "%u\n", !!q->blk_trace);
1711 goto out_unlock_bdev;
1714 if (q->blk_trace == NULL)
1715 ret = sprintf(buf, "disabled\n");
1716 else if (attr == &dev_attr_act_mask)
1717 ret = blk_trace_mask2str(buf, q->blk_trace->act_mask);
1718 else if (attr == &dev_attr_pid)
1719 ret = sprintf(buf, "%u\n", q->blk_trace->pid);
1720 else if (attr == &dev_attr_start_lba)
1721 ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba);
1722 else if (attr == &dev_attr_end_lba)
1723 ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba);
1726 mutex_unlock(&q->blk_trace_mutex);
1733 static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
1734 struct device_attribute *attr,
1735 const char *buf, size_t count)
1737 struct block_device *bdev;
1738 struct request_queue *q;
1739 struct hd_struct *p;
1741 ssize_t ret = -EINVAL;
1746 if (attr == &dev_attr_act_mask) {
1747 if (sscanf(buf, "%llx", &value) != 1) {
1748 /* Assume it is a list of trace category names */
1749 ret = blk_trace_str2mask(buf);
1754 } else if (sscanf(buf, "%llu", &value) != 1)
1759 p = dev_to_part(dev);
1760 bdev = bdget(part_devt(p));
1764 q = blk_trace_get_queue(bdev);
1768 mutex_lock(&q->blk_trace_mutex);
1770 if (attr == &dev_attr_enable) {
1772 ret = blk_trace_setup_queue(q, bdev);
1774 ret = blk_trace_remove_queue(q);
1775 goto out_unlock_bdev;
1779 if (q->blk_trace == NULL)
1780 ret = blk_trace_setup_queue(q, bdev);
1783 if (attr == &dev_attr_act_mask)
1784 q->blk_trace->act_mask = value;
1785 else if (attr == &dev_attr_pid)
1786 q->blk_trace->pid = value;
1787 else if (attr == &dev_attr_start_lba)
1788 q->blk_trace->start_lba = value;
1789 else if (attr == &dev_attr_end_lba)
1790 q->blk_trace->end_lba = value;
1794 mutex_unlock(&q->blk_trace_mutex);
1798 return ret ? ret : count;
1801 int blk_trace_init_sysfs(struct device *dev)
1803 return sysfs_create_group(&dev->kobj, &blk_trace_attr_group);
1806 void blk_trace_remove_sysfs(struct device *dev)
1808 sysfs_remove_group(&dev->kobj, &blk_trace_attr_group);
1811 #endif /* CONFIG_BLK_DEV_IO_TRACE */
1813 #ifdef CONFIG_EVENT_TRACING
1815 void blk_dump_cmd(char *buf, struct request *rq)
1818 int len = rq->cmd_len;
1819 unsigned char *cmd = rq->cmd;
1821 if (rq->cmd_type != REQ_TYPE_BLOCK_PC) {
1826 for (end = len - 1; end >= 0; end--)
1831 for (i = 0; i < len; i++) {
1832 buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]);
1833 if (i == end && end != len - 1) {
1834 sprintf(buf, " ..");
1840 void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
1849 else if (rw & REQ_DISCARD)
1858 if (rw & REQ_RAHEAD)
1864 if (rw & REQ_SECURE)
1870 #endif /* CONFIG_EVENT_TRACING */