blktrace.c revision 4ca530852346be239b7c19e7bec5d2b78855bebe
12056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 20fe23479577124bd2687e6783e39fa0fa4c28005Jens Axboe * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk> 32056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 42056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * This program is free software; you can redistribute it and/or modify 52056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * it under the terms of the GNU General Public License version 2 as 62056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * published by the Free Software Foundation. 72056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 82056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * This program is distributed in the hope that it will be useful, 92056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * but WITHOUT ANY WARRANTY; without even the implied warranty of 102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * GNU General Public License for more details. 122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * You should have received a copy of the GNU General Public License 142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * along with this program; if not, write to the Free Software 152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 182056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe#include <linux/kernel.h> 192056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe#include <linux/blkdev.h> 202056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe#include <linux/blktrace_api.h> 212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe#include <linux/percpu.h> 222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe#include <linux/init.h> 232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe#include <linux/mutex.h> 242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe#include <linux/debugfs.h> 25be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch#include <linux/time.h> 265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo#include <trace/block.h> 27939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo#include <linux/uaccess.h> 282db270a80b8f2238e536876cfb3987af02684df8Frederic Weisbecker#include "trace_output.h" 292056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic unsigned int blktrace_seq __read_mostly = 1; 312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 32c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct trace_array *blk_tr; 33c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int __read_mostly blk_tracer_enabled; 34c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 35c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* Select an alternative, minimalistic output than the original one */ 36ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt#define TRACE_BLK_OPT_CLASSIC 0x1 37c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 38c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer_opt blk_tracer_opts[] = { 39c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo /* Default disable the minimalistic output */ 40157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) }, 41c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo { } 42c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 43c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 44c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer_flags blk_tracer_flags = { 45c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .val = 0, 46c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .opts = blk_tracer_opts, 47c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 48c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/* Global reference count of probes */ 505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic DEFINE_MUTEX(blk_probe_mutex); 515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic atomic_t blk_probes_ref = ATOMIC_INIT(0); 525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic int blk_register_tracepoints(void); 545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_unregister_tracepoints(void); 555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 57be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch * Send out a notify message. 58be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch */ 59a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboestatic void trace_note(struct blk_trace *bt, pid_t pid, int action, 60a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe const void *data, size_t len) 61be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch{ 62be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch struct blk_io_trace *t; 63be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 64c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!bt->rchan) 65c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 66c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 67be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch t = relay_reserve(bt->rchan, sizeof(*t) + len); 68d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe if (t) { 69d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe const int cpu = smp_processor_id(); 70d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe 71d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 722997c8c4a0b179e8b834a7f30ba4323f2c60ccf4Ingo Molnar t->time = ktime_to_ns(ktime_get()); 73d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->device = bt->dev; 74d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->action = action; 75d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->pid = pid; 76d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->cpu = cpu; 77d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->pdu_len = len; 78d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe memcpy((void *) t + sizeof(*t), data, len); 79d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe } 80be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch} 81be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 82be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch/* 832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Send out a notify for this process, if we haven't done so since a trace 842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * started 852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk) 872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 88a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe tsk->btrace_seq = blktrace_seq; 89a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm)); 90be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch} 912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 92be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirchstatic void trace_note_time(struct blk_trace *bt) 93be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch{ 94be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch struct timespec now; 95be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch unsigned long flags; 96be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch u32 words[2]; 97be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 98be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch getnstimeofday(&now); 99be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch words[0] = now.tv_sec; 100be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch words[1] = now.tv_nsec; 101be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 102be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch local_irq_save(flags); 103be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words)); 104be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch local_irq_restore(flags); 1052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 1062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1079d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunellevoid __trace_note_message(struct blk_trace *bt, const char *fmt, ...) 1089d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle{ 1099d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle int n; 1109d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_list args; 11114a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde unsigned long flags; 11264565911cdb57c2f512a9715b985b5617402cc67Jens Axboe char *buf; 1139d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 114c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (blk_tr) { 115c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo va_start(args, fmt); 116c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ftrace_vprintk(fmt, args); 117c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo va_end(args); 118c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 119c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 120c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 121c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!bt->msg_data) 122c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 123c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 12414a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde local_irq_save(flags); 12564565911cdb57c2f512a9715b985b5617402cc67Jens Axboe buf = per_cpu_ptr(bt->msg_data, smp_processor_id()); 1269d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_start(args, fmt); 12764565911cdb57c2f512a9715b985b5617402cc67Jens Axboe n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); 1289d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_end(args); 1299d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 13064565911cdb57c2f512a9715b985b5617402cc67Jens Axboe trace_note(bt, 0, BLK_TN_MESSAGE, buf, n); 13114a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde local_irq_restore(flags); 1329d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle} 1339d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. BrunelleEXPORT_SYMBOL_GPL(__trace_note_message); 1349d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 1352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, 1362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid_t pid) 1372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 1382056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) 1392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (sector < bt->start_lba || sector > bt->end_lba) 1412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1422056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->pid && pid != bt->pid) 1432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1442056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 1462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 1472056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1482056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 1492056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Data direction bit lookup 1502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 151939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic u32 ddir_act[2] __read_mostly = { BLK_TC_ACT(BLK_TC_READ), 152939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo BLK_TC_ACT(BLK_TC_WRITE) }; 1532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 15435ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse/* The ilog2() calls fall out because they're constant */ 155939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo#define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \ 156939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name)) 1572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 1592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * The worker for the various blk_add_trace*() types. Fills out a 1602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_io_trace structure and places it in a per-cpu subbuffer. 1612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 1625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, 1632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int rw, u32 what, int error, int pdu_len, void *pdu_data) 1642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 1652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct task_struct *tsk = current; 166c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct ring_buffer_event *event = NULL; 1672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_io_trace *t; 1680a9877514c4fed10a70720293b37213dd172ee3eArnaldo Carvalho de Melo unsigned long flags = 0; 1692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe unsigned long *sequence; 1702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid_t pid; 171c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int cpu, pc = 0; 1722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 173157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo if (unlikely(bt->trace_state != Blktrace_running || 174157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo !blk_tracer_enabled)) 1752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return; 1762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe what |= ddir_act[rw & WRITE]; 17835ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, BARRIER); 17972c26c9a26ea7f2f3d14f162c2ebb07805f724eaIngo Molnar what |= MASK_TC_BIT(rw, SYNCIO); 18035ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, AHEAD); 18135ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, META); 18235ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, DISCARD); 1832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid = tsk->pid; 1852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (unlikely(act_log_check(bt, what, sector, pid))) 1862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return; 187c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo cpu = raw_smp_processor_id(); 188c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 189c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (blk_tr) { 190c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo tracing_record_cmdline(current); 191c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 19251a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo pc = preempt_count(); 19351a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo event = trace_buffer_lock_reserve(blk_tr, TRACE_BLK, 19451a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo sizeof(*t) + pdu_len, 19551a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo 0, pc); 196c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!event) 197c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 19851a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo t = ring_buffer_event_data(event); 199c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto record_it; 200c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 2012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 2032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * A word about the locking here - we disable interrupts to reserve 2042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * some space in the relay per-cpu buffer, to prevent an irq 20514a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde * from coming in and stepping on our toes. 2062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 2072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe local_irq_save(flags); 2082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (unlikely(tsk->btrace_seq != blktrace_seq)) 2102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe trace_note_tsk(bt, tsk); 2112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len); 2132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (t) { 2142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe sequence = per_cpu_ptr(bt->sequence, cpu); 2152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 2172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->sequence = ++(*sequence); 2182997c8c4a0b179e8b834a7f30ba4323f2c60ccf4Ingo Molnar t->time = ktime_to_ns(ktime_get()); 219c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melorecord_it: 22008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo /* 221939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * These two are not needed in ftrace as they are in the 222939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * generic trace_entry, filled by tracing_generic_entry_update, 223939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * but for the trace_event->bin() synthesizer benefit we do it 224939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * here too. 225939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo */ 226939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo t->cpu = cpu; 227939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo t->pid = pid; 22808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 2292056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->sector = sector; 2302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->bytes = bytes; 2312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->action = what; 2322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->device = bt->dev; 2332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->error = error; 2342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->pdu_len = pdu_len; 2352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (pdu_len) 2372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe memcpy((void *) t + sizeof(*t), pdu_data, pdu_len); 238c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 239c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (blk_tr) { 24051a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo trace_buffer_unlock_commit(blk_tr, event, 0, pc); 241c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 242c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 2432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 2442056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe local_irq_restore(flags); 2462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2472056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2482056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct dentry *blk_tree_root; 24911a57153e3377ffdf8cfca2eda9a99063f66b957Jens Axboestatic DEFINE_MUTEX(blk_tree_mutex); 2502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic void blk_trace_cleanup(struct blk_trace *bt) 2522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 25302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle debugfs_remove(bt->msg_file); 2542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(bt->dropped_file); 255f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe relay_close(bt->rchan); 2562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe free_percpu(bt->sequence); 25764565911cdb57c2f512a9715b985b5617402cc67Jens Axboe free_percpu(bt->msg_data); 2582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe kfree(bt); 2595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo mutex_lock(&blk_probe_mutex); 2605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (atomic_dec_and_test(&blk_probes_ref)) 2615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_unregister_tracepoints(); 2625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo mutex_unlock(&blk_probe_mutex); 2632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2656da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_remove(struct request_queue *q) 2662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 2672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt; 2682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = xchg(&q->blk_trace, NULL); 2702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt) 2712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 2722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_setup || 2742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state == Blktrace_stopped) 2752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe blk_trace_cleanup(bt); 2762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 2782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2796da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_remove); 2802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_dropped_open(struct inode *inode, struct file *filp) 2822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 2838e18e2941c53416aa219708e7dcad21fb4bd6794Theodore Ts'o filp->private_data = inode->i_private; 2842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 2862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic ssize_t blk_dropped_read(struct file *filp, char __user *buffer, 2892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe size_t count, loff_t *ppos) 2902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 2912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt = filp->private_data; 2922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe char buf[16]; 2932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); 2952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 2972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2992b8693c0617e972fc0b2fd1ebf8de97e15b656c3Arjan van de Venstatic const struct file_operations blk_dropped_fops = { 3002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .owner = THIS_MODULE, 3012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .open = blk_dropped_open, 3022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .read = blk_dropped_read, 3032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe}; 3042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 30502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic int blk_msg_open(struct inode *inode, struct file *filp) 30602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle{ 30702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle filp->private_data = inode->i_private; 30802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 30902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return 0; 31002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle} 31102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 31202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic ssize_t blk_msg_write(struct file *filp, const char __user *buffer, 31302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle size_t count, loff_t *ppos) 31402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle{ 31502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle char *msg; 31602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle struct blk_trace *bt; 31702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 31802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (count > BLK_TN_MAX_MSG) 31902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -EINVAL; 32002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 32102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle msg = kmalloc(count, GFP_KERNEL); 32202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (msg == NULL) 32302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -ENOMEM; 32402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 32502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (copy_from_user(msg, buffer, count)) { 32602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle kfree(msg); 32702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -EFAULT; 32802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle } 32902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 33002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle bt = filp->private_data; 33102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle __trace_note_message(bt, "%s", msg); 33202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle kfree(msg); 33302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 33402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return count; 33502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle} 33602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 33702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic const struct file_operations blk_msg_fops = { 33802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .owner = THIS_MODULE, 33902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .open = blk_msg_open, 34002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .write = blk_msg_write, 34102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle}; 34202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 3432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 3442056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Keep track of how many times we encountered a full subbuffer, to aid 3452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * the user space app in telling how many lost events there were. 3462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 3472056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, 3482056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe void *prev_subbuf, size_t prev_padding) 3492056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt; 3512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!relay_buf_full(buf)) 3532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 3542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = buf->chan->private_data; 3562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe atomic_inc(&bt->dropped); 3572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_remove_buf_file_callback(struct dentry *dentry) 3612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 362f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe struct dentry *parent = dentry->d_parent; 3632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(dentry); 364f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 365f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe /* 366f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe * this will fail for all but the last file, but that is ok. what we 367f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe * care about is the top level buts->name directory going away, when 368f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe * the last trace file is gone. Then we don't have to rmdir() that 369f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe * manually on trace stop, so it nicely solves the issue with 370f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe * force killing of running traces. 371f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe */ 372f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 373f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe debugfs_remove(parent); 3742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct dentry *blk_create_buf_file_callback(const char *filename, 3782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct dentry *parent, 3792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int mode, 3802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct rchan_buf *buf, 3812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int *is_global) 3822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return debugfs_create_file(filename, mode, parent, buf, 3842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe &relay_file_operations); 3852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct rchan_callbacks blk_relay_callbacks = { 3882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .subbuf_start = blk_subbuf_start_callback, 3892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .create_buf_file = blk_create_buf_file_callback, 3902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .remove_buf_file = blk_remove_buf_file_callback, 3912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe}; 3922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 3942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Setup everything required to start tracing 3952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 3966da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 397171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann struct blk_user_trace_setup *buts) 3982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *old_bt, *bt = NULL; 4002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct dentry *dir = NULL; 4012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret, i; 4022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 403171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (!buts->buf_size || !buts->buf_nr) 4042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 4052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4060497b345e7d067109e0dd9bf9f4978a6847ee13bJens Axboe strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); 4070497b345e7d067109e0dd9bf9f4978a6847ee13bJens Axboe buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; 4082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 4102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * some device names have larger paths - convert the slashes 4112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * to underscores for this to work as expected 4122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 413171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann for (i = 0; i < strlen(buts->name); i++) 414171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (buts->name[i] == '/') 415171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann buts->name[i] = '_'; 4162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOMEM; 4182056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = kzalloc(sizeof(*bt), GFP_KERNEL); 4192056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt) 4202056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->sequence = alloc_percpu(unsigned long); 4232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->sequence) 4242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 426f0ef03985130287c6c84ebe69416cf790e6cc00eIngo Molnar bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 42764565911cdb57c2f512a9715b985b5617402cc67Jens Axboe if (!bt->msg_data) 42864565911cdb57c2f512a9715b985b5617402cc67Jens Axboe goto err; 42964565911cdb57c2f512a9715b985b5617402cc67Jens Axboe 4302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOENT; 431f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 432f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe if (!blk_tree_root) { 433f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe blk_tree_root = debugfs_create_dir("block", NULL); 434f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe if (!blk_tree_root) 435f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe return -ENOMEM; 436f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe } 437f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 438f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe dir = debugfs_create_dir(buts->name, blk_tree_root); 439f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 4402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!dir) 4412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4422056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->dir = dir; 4446da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt bt->dev = dev; 4452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe atomic_set(&bt->dropped, 0); 4462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4472056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EIO; 448939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, 449939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo &blk_dropped_fops); 4502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->dropped_file) 4512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 45302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); 45402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (!bt->msg_file) 45502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle goto err; 45602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 457171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->rchan = relay_open("trace", dir, buts->buf_size, 458171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann buts->buf_nr, &blk_relay_callbacks, bt); 4592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->rchan) 4602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 462171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->act_mask = buts->act_mask; 4632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->act_mask) 4642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->act_mask = (u16) -1; 4652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 466171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->start_lba = buts->start_lba; 467171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->end_lba = buts->end_lba; 4682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->end_lba) 4692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->end_lba = -1ULL; 4702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 471171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->pid = buts->pid; 4722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_setup; 4732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo mutex_lock(&blk_probe_mutex); 4755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (atomic_add_return(1, &blk_probes_ref) == 1) { 4765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = blk_register_tracepoints(); 4775f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (ret) 4785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo goto probe_err; 4795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 4805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo mutex_unlock(&blk_probe_mutex); 4815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 4822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EBUSY; 4832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe old_bt = xchg(&q->blk_trace, bt); 4842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (old_bt) { 4852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe (void) xchg(&q->blk_trace, old_bt); 4862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 4882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 4905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Meloprobe_err: 4915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo atomic_dec(&blk_probes_ref); 4925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo mutex_unlock(&blk_probe_mutex); 4932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboeerr: 4942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt) { 49502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (bt->msg_file) 49602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle debugfs_remove(bt->msg_file); 4972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->dropped_file) 4982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(bt->dropped_file); 499a120586873d3d64de93bd6d593d237e131994e58Alan Stern free_percpu(bt->sequence); 50064565911cdb57c2f512a9715b985b5617402cc67Jens Axboe free_percpu(bt->msg_data); 5012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->rchan) 5022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe relay_close(bt->rchan); 5032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe kfree(bt); 5042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 5062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 507171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 5086da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 5096da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt char __user *arg) 510171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann{ 511171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann struct blk_user_trace_setup buts; 512171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann int ret; 513171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 514171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann ret = copy_from_user(&buts, arg, sizeof(buts)); 515171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (ret) 516171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return -EFAULT; 517171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 5186da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt ret = do_blk_trace_setup(q, name, dev, &buts); 519171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (ret) 520171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return ret; 521171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 522171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (copy_to_user(arg, &buts, sizeof(buts))) 523171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return -EFAULT; 524171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 525171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return 0; 526171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann} 5276da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_setup); 5282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5296da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_startstop(struct request_queue *q, int start) 5302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 5312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret; 532939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 5332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 534939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo if (bt == NULL) 5352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 5362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 5382056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * For starting a trace, we can transition from a setup or stopped 5392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * trace. For stopping a trace, the state must be running 5402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 5412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EINVAL; 5422056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (start) { 5432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_setup || 5442056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state == Blktrace_stopped) { 5452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe blktrace_seq++; 5462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe smp_mb(); 5472056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_running; 548be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 549be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch trace_note_time(bt); 5502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = 0; 5512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } else { 5532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_running) { 5542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_stopped; 5552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe relay_flush(bt->rchan); 5562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = 0; 5572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 5612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 5626da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_startstop); 5632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/** 5652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_trace_ioctl: - handle the ioctls associated with tracing 5662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @bdev: the block device 567ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt * @cmd: the ioctl cmd 5682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @arg: the argument data, if any 5692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 5702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe **/ 5712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboeint blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) 5722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 573165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboe struct request_queue *q; 5742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret, start = 0; 5756da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt char b[BDEVNAME_SIZE]; 5762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe q = bdev_get_queue(bdev); 5782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!q) 5792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -ENXIO; 5802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe mutex_lock(&bdev->bd_mutex); 5822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe switch (cmd) { 5842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESETUP: 585f36f21ecca9ee688301174e5f2e0827827a7a7ffJean Delvare bdevname(bdev, b); 5866da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt ret = blk_trace_setup(q, b, bdev->bd_dev, arg); 5872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 5882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESTART: 5892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe start = 1; 5902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESTOP: 5912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = blk_trace_startstop(q, start); 5922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 5932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACETEARDOWN: 5942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = blk_trace_remove(q); 5952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 5962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe default: 5972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOTTY; 5982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 5992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 6002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe mutex_unlock(&bdev->bd_mutex); 6022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 6032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/** 6062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_trace_shutdown: - stop and cleanup trace structures 6072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @q: the request queue associated with the device 6082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 6092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe **/ 610165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboevoid blk_trace_shutdown(struct request_queue *q) 6112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 6126c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan if (q->blk_trace) { 6136c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan blk_trace_startstop(q, 0); 6146c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan blk_trace_remove(q); 6156c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan } 6162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/* 6195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blktrace probes 6205f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo */ 6215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 6235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_rq - Add a trace for a request oriented action 6245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 6255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @rq: the source request 6265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @what: the action 6275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 6295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Records an action against a request. Will log the bio offset + size. 6305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6315f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 6325f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq(struct request_queue *q, struct request *rq, 6335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo u32 what) 6345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 6365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo int rw = rq->cmd_flags & 0x03; 6375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 6395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 6405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (blk_discard_rq(rq)) 6425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo rw |= (1 << BIO_RW_DISCARD); 6435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (blk_pc_request(rq)) { 6455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo what |= BLK_TC_ACT(BLK_TC_PC); 6465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, 6475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rq->cmd), rq->cmd); 6485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } else { 6495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo what |= BLK_TC_ACT(BLK_TC_FS); 6505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9, 6515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo rw, what, rq->errors, 0, NULL); 6525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 6535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq_abort(struct request_queue *q, struct request *rq) 6565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_ABORT); 6585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq_insert(struct request_queue *q, struct request *rq) 6615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_INSERT); 6635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq_issue(struct request_queue *q, struct request *rq) 6665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_ISSUE); 6685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 670939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_rq_requeue(struct request_queue *q, 671939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct request *rq) 6725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_REQUEUE); 6745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 676939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_rq_complete(struct request_queue *q, 677939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct request *rq) 6785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_COMPLETE); 6805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 6835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_bio - Add a trace for a bio oriented action 6845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 6855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @bio: the source bio 6865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @what: the action 6875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 6895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Records an action against a bio. Will log the bio offset + size. 6905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 6925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio(struct request_queue *q, struct bio *bio, 6935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo u32 what) 6945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 6965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 6985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 6995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, 7015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo !bio_flagged(bio, BIO_UPTODATE), 0, NULL); 7025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio_bounce(struct request_queue *q, struct bio *bio) 7055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_BOUNCE); 7075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio_complete(struct request_queue *q, struct bio *bio) 7105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_COMPLETE); 7125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 714939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_bio_backmerge(struct request_queue *q, 715939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio) 7165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE); 7185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 720939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_bio_frontmerge(struct request_queue *q, 721939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio) 7225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE); 7245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio_queue(struct request_queue *q, struct bio *bio) 7275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_QUEUE); 7295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 731939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_getrq(struct request_queue *q, 732939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio, int rw) 7335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bio) 7355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_GETRQ); 7365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else { 7375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 7405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL); 7415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 745939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_sleeprq(struct request_queue *q, 746939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio, int rw) 7475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bio) 7495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ); 7505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else { 7515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 754939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ, 755939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo 0, 0, NULL); 7565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_plug(struct request_queue *q) 7605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 7645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL); 7655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_unplug_io(struct request_queue *q) 7685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 7725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 7735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 7745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_IO, 0, 7765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 7775f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_unplug_timer(struct request_queue *q) 7815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 7855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 7865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 7875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_TIMER, 0, 7895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 7905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_split(struct request_queue *q, struct bio *bio, 7945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu) 7955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 7995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 8005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 8025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE), 8035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 8045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 8085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_remap - Add a trace for a remap operation 8095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 8105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @bio: the source bio 8115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @dev: target device 8125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @from: source sector 8135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @to: target sector 8145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 8165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Device mapper or raid target sometimes need to split a bio because 8175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * it spans a stripe (or similar). Add a trace for that action. 8185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 8205f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_remap(struct request_queue *q, struct bio *bio, 8215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo dev_t dev, sector_t from, sector_t to) 8225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_io_trace_remap r; 8255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 8275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 8285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo r.device = cpu_to_be32(dev); 8305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo r.device_from = cpu_to_be32(bio->bi_bdev->bd_dev); 8315f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo r.sector = cpu_to_be64(to); 8325f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP, 8345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r); 8355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 8385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_driver_data - Add binary message with driver-specific data 8395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 8405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @rq: io request 8415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @data: driver-specific data 8425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @len: length of driver-specific data 8435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 8455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Some drivers might want to write driver-specific data per request. 8465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 8485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melovoid blk_add_driver_data(struct request_queue *q, 8495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct request *rq, 8505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo void *data, size_t len) 8515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 8555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 8565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (blk_pc_request(rq)) 8585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA, 8595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo rq->errors, len, data); 8605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else 8615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9, 8625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 0, BLK_TA_DRV_DATA, rq->errors, len, data); 8635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(blk_add_driver_data); 8655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic int blk_register_tracepoints(void) 8675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo int ret; 8695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_abort(blk_add_trace_rq_abort); 8715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_insert(blk_add_trace_rq_insert); 8735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_issue(blk_add_trace_rq_issue); 8755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue); 8775f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_complete(blk_add_trace_rq_complete); 8795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce); 8815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_complete(blk_add_trace_bio_complete); 8835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge); 8855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge); 8875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_queue(blk_add_trace_bio_queue); 8895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_getrq(blk_add_trace_getrq); 8915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_sleeprq(blk_add_trace_sleeprq); 8935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_plug(blk_add_trace_plug); 8955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_unplug_timer(blk_add_trace_unplug_timer); 8975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_unplug_io(blk_add_trace_unplug_io); 8995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_split(blk_add_trace_split); 9015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_remap(blk_add_trace_remap); 9035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return 0; 9055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 9065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_unregister_tracepoints(void) 9085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 9095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_remap(blk_add_trace_remap); 9105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_split(blk_add_trace_split); 9115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_unplug_io(blk_add_trace_unplug_io); 9125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_unplug_timer(blk_add_trace_unplug_timer); 9135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_plug(blk_add_trace_plug); 9145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_sleeprq(blk_add_trace_sleeprq); 9155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_getrq(blk_add_trace_getrq); 9165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_queue(blk_add_trace_bio_queue); 9175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge); 9185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge); 9195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_complete(blk_add_trace_bio_complete); 9205f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce); 9215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_complete(blk_add_trace_rq_complete); 9225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue); 9235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_issue(blk_add_trace_rq_issue); 9245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_insert(blk_add_trace_rq_insert); 9255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_abort(blk_add_trace_rq_abort); 9265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo tracepoint_synchronize_unregister(); 9285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 929c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 930c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 931c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * struct blk_io_tracer formatting routines 932c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 933c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 934c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void fill_rwbs(char *rwbs, const struct blk_io_trace *t) 935c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 936157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo int i = 0; 937157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 938157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo if (t->action & BLK_TC_DISCARD) 939157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'D'; 940157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else if (t->action & BLK_TC_WRITE) 941157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'W'; 942157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else if (t->bytes) 943157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'R'; 944157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else 945157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'N'; 946157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 947157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo if (t->action & BLK_TC_AHEAD) 948157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'A'; 949157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo if (t->action & BLK_TC_BARRIER) 950157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'B'; 951157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo if (t->action & BLK_TC_SYNC) 952157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'S'; 953157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo if (t->action & BLK_TC_META) 954157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'M'; 955157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 956157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i] = '\0'; 957c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 958c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 959c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline 960c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloconst struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) 961c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 962c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return (const struct blk_io_trace *)ent; 963c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 964c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 965c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline const void *pdu_start(const struct trace_entry *ent) 966c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 967c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent) + 1; 968c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 969c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 970c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline u32 t_sec(const struct trace_entry *ent) 971c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 972c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->bytes >> 9; 973c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 974c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 975c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline unsigned long long t_sector(const struct trace_entry *ent) 976c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 977c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->sector; 978c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 979c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 980c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline __u16 t_error(const struct trace_entry *ent) 981c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 982c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->sector; 983c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 984c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 985c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic __u64 get_pdu_int(const struct trace_entry *ent) 986c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 987c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const __u64 *val = pdu_start(ent); 988c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return be64_to_cpu(*val); 989c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 990c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 991c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void get_pdu_remap(const struct trace_entry *ent, 992c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_io_trace_remap *r) 993c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 994c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const struct blk_io_trace_remap *__r = pdu_start(ent); 995c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo __u64 sector = __r->sector; 996c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 997c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo r->device = be32_to_cpu(__r->device); 998c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo r->device_from = be32_to_cpu(__r->device_from); 999c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo r->sector = be64_to_cpu(sector); 1000c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1001c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1002c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_action_iter(struct trace_iterator *iter, const char *act) 1003c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1004c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char rwbs[6]; 1005c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unsigned long long ts = ns2usecs(iter->ts); 1006c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unsigned long usec_rem = do_div(ts, USEC_PER_SEC); 1007c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unsigned secs = (unsigned long)ts; 1008c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const struct trace_entry *ent = iter->ent; 1009c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const struct blk_io_trace *t = (const struct blk_io_trace *)ent; 1010c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1011c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo fill_rwbs(rwbs, t); 1012c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1013c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(&iter->seq, 1014c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo "%3d,%-3d %2d %5d.%06lu %5u %2s %3s ", 1015c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo MAJOR(t->device), MINOR(t->device), iter->cpu, 1016c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo secs, usec_rem, ent->pid, act, rwbs); 1017c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1018c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1019c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_action_seq(struct trace_seq *s, const struct blk_io_trace *t, 1020c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *act) 1021c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1022c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char rwbs[6]; 1023c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo fill_rwbs(rwbs, t); 1024c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%3d,%-3d %2s %3s ", 1025c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo MAJOR(t->device), MINOR(t->device), act, rwbs); 1026c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1027c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1028c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent) 1029c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 10304ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 10314ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10324ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 1033c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1034c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (t_sec(ent)) 1035c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu + %u [%s]\n", 1036c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo t_sector(ent), t_sec(ent), cmd); 1037c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "[%s]\n", cmd); 1038c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1039c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1040157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melostatic int blk_log_with_error(struct trace_seq *s, 1041157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo const struct trace_entry *ent) 1042c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1043c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (t_sec(ent)) 1044c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu + %u [%d]\n", t_sector(ent), 1045c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo t_sec(ent), t_error(ent)); 1046c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu [%d]\n", t_sector(ent), t_error(ent)); 1047c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1048c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1049c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent) 1050c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1051c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_io_trace_remap r = { .device = 0, }; 1052c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1053c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo get_pdu_remap(ent, &r); 1054c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", 1055c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo t_sector(ent), 1056c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo t_sec(ent), MAJOR(r.device), MINOR(r.device), 1057c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo (unsigned long long)r.sector); 1058c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1059c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1060c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent) 1061c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 10624ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 10634ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10644ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 10654ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10664ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt return trace_seq_printf(s, "[%s]\n", cmd); 1067c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1068c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1069c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent) 1070c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 10714ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 10724ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10734ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 10744ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10754ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent)); 1076c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1077c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1078c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_split(struct trace_seq *s, const struct trace_entry *ent) 1079c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 10804ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 10814ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10824ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 10834ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 1084c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), 10854ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt get_pdu_int(ent), cmd); 1086c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1087c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1088c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1089c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * struct tracer operations 1090c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1091c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1092c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_print_header(struct seq_file *m) 1093c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1094c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 1095c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 1096c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" 1097c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo "# | | | | | |\n"); 1098c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1099c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1100c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_start(struct trace_array *tr) 1101c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1102c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&blk_probe_mutex); 1103c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (atomic_add_return(1, &blk_probes_ref) == 1) 1104c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (blk_register_tracepoints()) 1105c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo atomic_dec(&blk_probes_ref); 1106c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&blk_probe_mutex); 110708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo trace_flags &= ~TRACE_ITER_CONTEXT_INFO; 1108c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1109c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1110c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_tracer_init(struct trace_array *tr) 1111c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1112c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tr = tr; 1113c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_start(tr); 1114c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&blk_probe_mutex); 1115c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_enabled++; 1116c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&blk_probe_mutex); 1117c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1118c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1119c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1120c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_stop(struct trace_array *tr) 1121c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 112208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo trace_flags |= TRACE_ITER_CONTEXT_INFO; 1123c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&blk_probe_mutex); 1124c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (atomic_dec_and_test(&blk_probes_ref)) 1125c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_unregister_tracepoints(); 1126c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&blk_probe_mutex); 1127c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1128c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1129c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_reset(struct trace_array *tr) 1130c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1131c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!atomic_read(&blk_probes_ref)) 1132c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 1133c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1134c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&blk_probe_mutex); 1135c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_enabled--; 1136c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo WARN_ON(blk_tracer_enabled < 0); 1137c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&blk_probe_mutex); 1138c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1139c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_stop(tr); 1140c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1141c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1142c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct { 1143c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *act[2]; 1144ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt int (*print)(struct trace_seq *s, const struct trace_entry *ent); 1145c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} what2act[] __read_mostly = { 1146ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, 1147c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, 1148c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, 1149c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, 1150c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, 1151c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, 1152c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, 1153c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, 1154c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, 1155c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, 1156c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, 1157c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, 1158c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, 1159c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, 1160c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, 1161c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1162c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1163ae7462b4f1fe1f36b5d562dbd5202a2eba01f072Arnaldo Carvalho de Melostatic enum print_line_t blk_trace_event_print(struct trace_iterator *iter, 1164ae7462b4f1fe1f36b5d562dbd5202a2eba01f072Arnaldo Carvalho de Melo int flags) 1165c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 11662c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo struct trace_seq *s = &iter->seq; 11672c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo const struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; 1168c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const u16 what = t->action & ((1 << BLK_TC_SHIFT) - 1); 1169c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int ret; 1170c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1171d9793bd8018f835c64b10f44e278c86cecb8e932Arnaldo Carvalho de Melo if (!trace_print_context(iter)) 117208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return TRACE_TYPE_PARTIAL_LINE; 117308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1174c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (unlikely(what == 0 || what > ARRAY_SIZE(what2act))) 1175c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = trace_seq_printf(s, "Bad pc action %x\n", what); 1176c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else { 1177c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const bool long_act = !!(trace_flags & TRACE_ITER_VERBOSE); 1178c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = blk_log_action_seq(s, t, what2act[what].act[long_act]); 1179c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret) 11802c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo ret = what2act[what].print(s, iter->ent); 1181c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1182c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1183c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 1184c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1185c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 118608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melostatic int blk_trace_synthesize_old_trace(struct trace_iterator *iter) 118708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo{ 118808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct trace_seq *s = &iter->seq; 118908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; 119008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo const int offset = offsetof(struct blk_io_trace, sector); 119108a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct blk_io_trace old = { 119208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, 119308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .time = ns2usecs(iter->ts), 119408a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo }; 119508a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 119608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo if (!trace_seq_putmem(s, &old, offset)) 119708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return 0; 119808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return trace_seq_putmem(s, &t->sector, 119908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo sizeof(old) - offset + t->pdu_len); 120008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo} 120108a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1202ae7462b4f1fe1f36b5d562dbd5202a2eba01f072Arnaldo Carvalho de Melostatic enum print_line_t 1203ae7462b4f1fe1f36b5d562dbd5202a2eba01f072Arnaldo Carvalho de Meloblk_trace_event_print_binary(struct trace_iterator *iter, int flags) 120408a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo{ 120508a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return blk_trace_synthesize_old_trace(iter) ? 120608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 120708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo} 120808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1209c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) 1210c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1211c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const struct blk_io_trace *t; 1212c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo u16 what; 1213c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int ret; 1214c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1215c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 1216c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return TRACE_TYPE_UNHANDLED; 1217c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1218c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo t = (const struct blk_io_trace *)iter->ent; 1219c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo what = t->action & ((1 << BLK_TC_SHIFT) - 1); 1220c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1221c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (unlikely(what == 0 || what > ARRAY_SIZE(what2act))) 1222c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = trace_seq_printf(&iter->seq, "Bad pc action %x\n", what); 1223c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else { 1224c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const bool long_act = !!(trace_flags & TRACE_ITER_VERBOSE); 1225c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = blk_log_action_iter(iter, what2act[what].act[long_act]); 1226c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret) 1227c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = what2act[what].print(&iter->seq, iter->ent); 1228c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1229c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1230c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 1231c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1232c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1233c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer blk_tracer __read_mostly = { 1234c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .name = "blk", 1235c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .init = blk_tracer_init, 1236c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .reset = blk_tracer_reset, 1237c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .start = blk_tracer_start, 1238c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .stop = blk_tracer_stop, 1239c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .print_header = blk_tracer_print_header, 1240c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .print_line = blk_tracer_print_line, 1241c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .flags = &blk_tracer_flags, 1242c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1243c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1244c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct trace_event trace_blk_event = { 1245ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt .type = TRACE_BLK, 1246c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .trace = blk_trace_event_print, 124708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .binary = blk_trace_event_print_binary, 1248c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1249c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1250c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int __init init_blk_tracer(void) 1251c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1252c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!register_ftrace_event(&trace_blk_event)) { 1253c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo pr_warning("Warning: could not register block events\n"); 1254c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 1; 1255c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1256c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1257c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (register_tracer(&blk_tracer) != 0) { 1258c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo pr_warning("Warning: could not register the block tracer\n"); 1259c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unregister_ftrace_event(&trace_blk_event); 1260c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 1; 1261c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1262c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1263c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1264c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1265c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1266c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melodevice_initcall(init_blk_tracer); 1267c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1268c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_trace_remove_queue(struct request_queue *q) 1269c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1270c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_trace *bt; 1271c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1272c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt = xchg(&q->blk_trace, NULL); 1273c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bt == NULL) 1274c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return -EINVAL; 1275c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1276c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo kfree(bt); 1277c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1278c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1279c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1280c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1281c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * Setup everything required to start tracing 1282c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1283c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_trace_setup_queue(struct request_queue *q, dev_t dev) 1284c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1285c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_trace *old_bt, *bt = NULL; 1286c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int ret; 1287c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1288c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = -ENOMEM; 1289c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt = kzalloc(sizeof(*bt), GFP_KERNEL); 1290c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!bt) 1291c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto err; 1292c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1293c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt->dev = dev; 1294c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt->act_mask = (u16)-1; 1295c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt->end_lba = -1ULL; 1296c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt->trace_state = Blktrace_running; 1297c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1298c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo old_bt = xchg(&q->blk_trace, bt); 1299c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (old_bt != NULL) { 1300c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo (void)xchg(&q->blk_trace, old_bt); 1301c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo kfree(bt); 1302c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = -EBUSY; 1303c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1304c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1305c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloerr: 1306c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret; 1307c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1308c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1309c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1310c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * sysfs interface to enable and configure tracing 1311c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1312c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1313c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_enable_show(struct device *dev, 1314c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1315c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf) 1316c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1317c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p = dev_to_part(dev); 1318c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1319c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ssize_t ret = -ENXIO; 1320c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1321c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo lock_kernel(); 1322c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1323c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev != NULL) { 1324c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q = bdev_get_queue(bdev); 1325c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1326c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q != NULL) { 1327c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1328c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%u\n", !!q->blk_trace); 1329c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1330c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1331c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1332c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 1333c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1334c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1335c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unlock_kernel(); 1336c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret; 1337c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1338c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1339c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_enable_store(struct device *dev, 1340c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1341c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count) 1342c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1343c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1344c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1345c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p; 1346c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int value; 1347c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ssize_t ret = -ENXIO; 1348c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1349c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (count == 0 || sscanf(buf, "%d", &value) != 1) 1350c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1351c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1352c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo lock_kernel(); 1353c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo p = dev_to_part(dev); 1354c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1355c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 1356c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_unlock_kernel; 1357c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1358c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q = bdev_get_queue(bdev); 1359c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1360c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1361c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1362c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1363c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (value) 1364c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = blk_trace_setup_queue(q, bdev->bd_dev); 1365c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else 1366c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = blk_trace_remove_queue(q); 1367c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1368c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1369c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret == 0) 1370c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = count; 1371c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1372c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 1373c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_unlock_kernel: 1374c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unlock_kernel(); 1375c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout: 1376c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret; 1377c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1378c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1379c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_show(struct device *dev, 1380c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1381c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf); 1382c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_store(struct device *dev, 1383c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1384c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count); 1385c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo#define BLK_TRACE_DEVICE_ATTR(_name) \ 1386c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ 1387c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_attr_show, \ 1388c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_attr_store) 1389c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1390c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, 1391c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_enable_show, sysfs_blk_trace_enable_store); 1392c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(act_mask); 1393c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(pid); 1394c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(start_lba); 1395c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(end_lba); 1396c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1397c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct attribute *blk_trace_attrs[] = { 1398c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_enable.attr, 1399c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_act_mask.attr, 1400c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_pid.attr, 1401c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_start_lba.attr, 1402c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_end_lba.attr, 1403c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo NULL 1404c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1405c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1406c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostruct attribute_group blk_trace_attr_group = { 1407c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .name = "trace", 1408c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .attrs = blk_trace_attrs, 1409c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1410c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1411c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_str2act_mask(const char *str) 1412c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1413c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int mask = 0; 1414c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *copy = kstrdup(str, GFP_KERNEL), *s; 1415c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1416c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (copy == NULL) 1417c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return -ENOMEM; 1418c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1419c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo s = strstrip(copy); 1420c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1421c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo while (1) { 1422c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *sep = strchr(s, ','); 1423c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1424c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (sep != NULL) 1425c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo *sep = '\0'; 1426c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1427c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (strcasecmp(s, "barrier") == 0) 1428c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mask |= BLK_TC_BARRIER; 1429c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (strcasecmp(s, "complete") == 0) 1430c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mask |= BLK_TC_COMPLETE; 1431c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (strcasecmp(s, "fs") == 0) 1432c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mask |= BLK_TC_FS; 1433c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (strcasecmp(s, "issue") == 0) 1434c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mask |= BLK_TC_ISSUE; 1435c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (strcasecmp(s, "pc") == 0) 1436c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mask |= BLK_TC_PC; 1437c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (strcasecmp(s, "queue") == 0) 1438c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mask |= BLK_TC_QUEUE; 1439c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (strcasecmp(s, "read") == 0) 1440c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mask |= BLK_TC_READ; 1441c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (strcasecmp(s, "requeue") == 0) 1442c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mask |= BLK_TC_REQUEUE; 1443c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (strcasecmp(s, "sync") == 0) 1444c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mask |= BLK_TC_SYNC; 1445c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (strcasecmp(s, "write") == 0) 1446c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mask |= BLK_TC_WRITE; 1447c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1448c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (sep == NULL) 1449c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo break; 1450c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1451c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo s = sep + 1; 1452c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1453c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo kfree(copy); 1454c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1455c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return mask; 1456c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1457c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1458c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_show(struct device *dev, 1459c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1460c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf) 1461c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1462c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p = dev_to_part(dev); 1463c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1464c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1465c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ssize_t ret = -ENXIO; 1466c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1467c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo lock_kernel(); 1468c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1469c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 1470c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_unlock_kernel; 1471c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1472c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q = bdev_get_queue(bdev); 1473c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1474c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1475c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1476c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q->blk_trace == NULL) 1477c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "disabled\n"); 1478c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_act_mask) 1479c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%#x\n", q->blk_trace->act_mask); 1480c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_pid) 1481c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%u\n", q->blk_trace->pid); 1482c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_start_lba) 1483c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); 1484c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_end_lba) 1485c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); 1486c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1487c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1488c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 1489c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_unlock_kernel: 1490c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unlock_kernel(); 1491c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret; 1492c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1493c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1494c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_store(struct device *dev, 1495c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1496c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count) 1497c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1498c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1499c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1500c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p; 1501c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo u64 value; 1502c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ssize_t ret = -ENXIO; 1503c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1504c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (count == 0) 1505c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1506c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1507c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (attr == &dev_attr_act_mask) { 1508c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (sscanf(buf, "%llx", &value) != 1) { 1509c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo /* Assume it is a list of trace category names */ 1510c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo value = blk_str2act_mask(buf); 1511c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (value < 0) 1512c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1513c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1514c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } else if (sscanf(buf, "%llu", &value) != 1) 1515c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1516c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1517c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo lock_kernel(); 1518c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo p = dev_to_part(dev); 1519c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1520c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 1521c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_unlock_kernel; 1522c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1523c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q = bdev_get_queue(bdev); 1524c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1525c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1526c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1527c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1528c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = 0; 1529c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q->blk_trace == NULL) 1530c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = blk_trace_setup_queue(q, bdev->bd_dev); 1531c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1532c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret == 0) { 1533c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (attr == &dev_attr_act_mask) 1534c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->act_mask = value; 1535c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_pid) 1536c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->pid = value; 1537c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_start_lba) 1538c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->start_lba = value; 1539c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_end_lba) 1540c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->end_lba = value; 1541c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = count; 1542c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1543c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1544c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1545c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 1546c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_unlock_kernel: 1547c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unlock_kernel(); 1548c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout: 1549c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret; 1550c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1551