blktrace.c revision b78825d608f30a47e3154ab6872a03f0de0c9d45
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; 335006ea73f38caef6065d1136808413813271633fLi Zefanstatic bool blk_tracer_enabled __read_mostly; 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 atomic_t blk_probes_ref = ATOMIC_INIT(0); 515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 523c289ba7c320560ee74979a8895141c829046a2dLi Zefanstatic void blk_register_tracepoints(void); 535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_unregister_tracepoints(void); 545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 56be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch * Send out a notify message. 57be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch */ 58a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboestatic void trace_note(struct blk_trace *bt, pid_t pid, int action, 59a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe const void *data, size_t len) 60be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch{ 61be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch struct blk_io_trace *t; 6218cea4591a98817697017bcb056a848bae1205dfLi Zefan struct ring_buffer_event *event = NULL; 6318cea4591a98817697017bcb056a848bae1205dfLi Zefan int pc = 0; 6418cea4591a98817697017bcb056a848bae1205dfLi Zefan int cpu = smp_processor_id(); 6518cea4591a98817697017bcb056a848bae1205dfLi Zefan bool blk_tracer = blk_tracer_enabled; 6618cea4591a98817697017bcb056a848bae1205dfLi Zefan 6718cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 6818cea4591a98817697017bcb056a848bae1205dfLi Zefan pc = preempt_count(); 6918cea4591a98817697017bcb056a848bae1205dfLi Zefan event = trace_buffer_lock_reserve(blk_tr, TRACE_BLK, 7018cea4591a98817697017bcb056a848bae1205dfLi Zefan sizeof(*t) + len, 7118cea4591a98817697017bcb056a848bae1205dfLi Zefan 0, pc); 7218cea4591a98817697017bcb056a848bae1205dfLi Zefan if (!event) 7318cea4591a98817697017bcb056a848bae1205dfLi Zefan return; 7418cea4591a98817697017bcb056a848bae1205dfLi Zefan t = ring_buffer_event_data(event); 7518cea4591a98817697017bcb056a848bae1205dfLi Zefan goto record_it; 7618cea4591a98817697017bcb056a848bae1205dfLi Zefan } 77be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 78c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!bt->rchan) 79c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 80c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 81be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch t = relay_reserve(bt->rchan, sizeof(*t) + len); 82d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe if (t) { 83d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 842997c8c4a0b179e8b834a7f30ba4323f2c60ccf4Ingo Molnar t->time = ktime_to_ns(ktime_get()); 8518cea4591a98817697017bcb056a848bae1205dfLi Zefanrecord_it: 86d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->device = bt->dev; 87d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->action = action; 88d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->pid = pid; 89d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->cpu = cpu; 90d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->pdu_len = len; 91d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe memcpy((void *) t + sizeof(*t), data, len); 9218cea4591a98817697017bcb056a848bae1205dfLi Zefan 9318cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) 9418cea4591a98817697017bcb056a848bae1205dfLi Zefan trace_buffer_unlock_commit(blk_tr, event, 0, pc); 95d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe } 96be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch} 97be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 98be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch/* 992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Send out a notify for this process, if we haven't done so since a trace 1002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * started 1012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 1022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk) 1032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 104a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe tsk->btrace_seq = blktrace_seq; 105a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm)); 106be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch} 1072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 108be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirchstatic void trace_note_time(struct blk_trace *bt) 109be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch{ 110be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch struct timespec now; 111be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch unsigned long flags; 112be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch u32 words[2]; 113be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 114be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch getnstimeofday(&now); 115be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch words[0] = now.tv_sec; 116be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch words[1] = now.tv_nsec; 117be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 118be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch local_irq_save(flags); 119be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words)); 120be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch local_irq_restore(flags); 1212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 1222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1239d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunellevoid __trace_note_message(struct blk_trace *bt, const char *fmt, ...) 1249d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle{ 1259d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle int n; 1269d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_list args; 12714a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde unsigned long flags; 12864565911cdb57c2f512a9715b985b5617402cc67Jens Axboe char *buf; 1299d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 13018cea4591a98817697017bcb056a848bae1205dfLi Zefan if (unlikely(bt->trace_state != Blktrace_running && 13118cea4591a98817697017bcb056a848bae1205dfLi Zefan !blk_tracer_enabled)) 132c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 133c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 13414a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde local_irq_save(flags); 13564565911cdb57c2f512a9715b985b5617402cc67Jens Axboe buf = per_cpu_ptr(bt->msg_data, smp_processor_id()); 1369d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_start(args, fmt); 13764565911cdb57c2f512a9715b985b5617402cc67Jens Axboe n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); 1389d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_end(args); 1399d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 14064565911cdb57c2f512a9715b985b5617402cc67Jens Axboe trace_note(bt, 0, BLK_TN_MESSAGE, buf, n); 14114a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde local_irq_restore(flags); 1429d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle} 1439d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. BrunelleEXPORT_SYMBOL_GPL(__trace_note_message); 1449d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 1452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, 1462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid_t pid) 1472056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 1482056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) 1492056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (sector < bt->start_lba || sector > bt->end_lba) 1512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->pid && pid != bt->pid) 1532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 1562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 1572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 1592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Data direction bit lookup 1602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 161e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefanstatic const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), 162e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefan BLK_TC_ACT(BLK_TC_WRITE) }; 1632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 16435ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse/* The ilog2() calls fall out because they're constant */ 165939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo#define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \ 166939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name)) 1672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 1692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * The worker for the various blk_add_trace*() types. Fills out a 1702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_io_trace structure and places it in a per-cpu subbuffer. 1712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 1725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, 1732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int rw, u32 what, int error, int pdu_len, void *pdu_data) 1742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 1752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct task_struct *tsk = current; 176c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct ring_buffer_event *event = NULL; 1772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_io_trace *t; 1780a9877514c4fed10a70720293b37213dd172ee3eArnaldo Carvalho de Melo unsigned long flags = 0; 1792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe unsigned long *sequence; 1802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid_t pid; 181c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int cpu, pc = 0; 18218cea4591a98817697017bcb056a848bae1205dfLi Zefan bool blk_tracer = blk_tracer_enabled; 1832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 18418cea4591a98817697017bcb056a848bae1205dfLi Zefan if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) 1852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return; 1862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe what |= ddir_act[rw & WRITE]; 18835ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, BARRIER); 18972c26c9a26ea7f2f3d14f162c2ebb07805f724eaIngo Molnar what |= MASK_TC_BIT(rw, SYNCIO); 19035ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, AHEAD); 19135ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, META); 19235ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, DISCARD); 1932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid = tsk->pid; 1952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (unlikely(act_log_check(bt, what, sector, pid))) 1962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return; 197c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo cpu = raw_smp_processor_id(); 198c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 19918cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 200c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo tracing_record_cmdline(current); 201c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 20251a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo pc = preempt_count(); 20351a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo event = trace_buffer_lock_reserve(blk_tr, TRACE_BLK, 20451a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo sizeof(*t) + pdu_len, 20551a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo 0, pc); 206c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!event) 207c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 20851a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo t = ring_buffer_event_data(event); 209c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto record_it; 210c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 2112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 2132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * A word about the locking here - we disable interrupts to reserve 2142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * some space in the relay per-cpu buffer, to prevent an irq 21514a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde * from coming in and stepping on our toes. 2162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 2172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe local_irq_save(flags); 2182056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2192056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (unlikely(tsk->btrace_seq != blktrace_seq)) 2202056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe trace_note_tsk(bt, tsk); 2212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len); 2232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (t) { 2242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe sequence = per_cpu_ptr(bt->sequence, cpu); 2252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 2272056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->sequence = ++(*sequence); 2282997c8c4a0b179e8b834a7f30ba4323f2c60ccf4Ingo Molnar t->time = ktime_to_ns(ktime_get()); 229c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melorecord_it: 23008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo /* 231939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * These two are not needed in ftrace as they are in the 232939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * generic trace_entry, filled by tracing_generic_entry_update, 233939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * but for the trace_event->bin() synthesizer benefit we do it 234939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * here too. 235939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo */ 236939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo t->cpu = cpu; 237939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo t->pid = pid; 23808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 2392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->sector = sector; 2402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->bytes = bytes; 2412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->action = what; 2422056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->device = bt->dev; 2432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->error = error; 2442056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->pdu_len = pdu_len; 2452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (pdu_len) 2472056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe memcpy((void *) t + sizeof(*t), pdu_data, pdu_len); 248c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 24918cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 25051a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo trace_buffer_unlock_commit(blk_tr, event, 0, pc); 251c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 252c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 2532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 2542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe local_irq_restore(flags); 2562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct dentry *blk_tree_root; 25911a57153e3377ffdf8cfca2eda9a99063f66b957Jens Axboestatic DEFINE_MUTEX(blk_tree_mutex); 2602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 261ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefanstatic void blk_trace_free(struct blk_trace *bt) 2622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 26302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle debugfs_remove(bt->msg_file); 2642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(bt->dropped_file); 265f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe relay_close(bt->rchan); 2662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe free_percpu(bt->sequence); 26764565911cdb57c2f512a9715b985b5617402cc67Jens Axboe free_percpu(bt->msg_data); 2682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe kfree(bt); 269ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan} 270ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan 271ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefanstatic void blk_trace_cleanup(struct blk_trace *bt) 272ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan{ 273ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 2745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (atomic_dec_and_test(&blk_probes_ref)) 2755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_unregister_tracepoints(); 2762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2786da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_remove(struct request_queue *q) 2792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 2802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt; 2812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = xchg(&q->blk_trace, NULL); 2832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt) 2842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 2852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2865554720482a631702146a959db22fe417740e0a6Li Zefan if (bt->trace_state != Blktrace_running) 2872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe blk_trace_cleanup(bt); 2882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 2902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2916da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_remove); 2922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_dropped_open(struct inode *inode, struct file *filp) 2942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 2958e18e2941c53416aa219708e7dcad21fb4bd6794Theodore Ts'o filp->private_data = inode->i_private; 2962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 2982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic ssize_t blk_dropped_read(struct file *filp, char __user *buffer, 3012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe size_t count, loff_t *ppos) 3022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt = filp->private_data; 3042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe char buf[16]; 3052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); 3072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 3092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3112b8693c0617e972fc0b2fd1ebf8de97e15b656c3Arjan van de Venstatic const struct file_operations blk_dropped_fops = { 3122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .owner = THIS_MODULE, 3132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .open = blk_dropped_open, 3142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .read = blk_dropped_read, 3152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe}; 3162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 31702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic int blk_msg_open(struct inode *inode, struct file *filp) 31802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle{ 31902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle filp->private_data = inode->i_private; 32002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 32102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return 0; 32202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle} 32302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 32402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic ssize_t blk_msg_write(struct file *filp, const char __user *buffer, 32502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle size_t count, loff_t *ppos) 32602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle{ 32702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle char *msg; 32802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle struct blk_trace *bt; 32902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 3307635b03adf3d7b84da7649b81efa91e6ebf11b85Li Zefan if (count >= BLK_TN_MAX_MSG) 33102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -EINVAL; 33202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 333a4b3ada83d06554d307dd54abdc62b2e5648264aCarl Henrik Lunde msg = kmalloc(count + 1, GFP_KERNEL); 33402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (msg == NULL) 33502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -ENOMEM; 33602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 33702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (copy_from_user(msg, buffer, count)) { 33802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle kfree(msg); 33902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -EFAULT; 34002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle } 34102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 342a4b3ada83d06554d307dd54abdc62b2e5648264aCarl Henrik Lunde msg[count] = '\0'; 34302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle bt = filp->private_data; 34402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle __trace_note_message(bt, "%s", msg); 34502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle kfree(msg); 34602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 34702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return count; 34802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle} 34902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 35002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic const struct file_operations blk_msg_fops = { 35102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .owner = THIS_MODULE, 35202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .open = blk_msg_open, 35302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .write = blk_msg_write, 35402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle}; 35502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 3562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 3572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Keep track of how many times we encountered a full subbuffer, to aid 3582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * the user space app in telling how many lost events there were. 3592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 3602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, 3612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe void *prev_subbuf, size_t prev_padding) 3622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt; 3642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!relay_buf_full(buf)) 3662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 3672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = buf->chan->private_data; 3692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe atomic_inc(&bt->dropped); 3702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_remove_buf_file_callback(struct dentry *dentry) 3742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 375f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe struct dentry *parent = dentry->d_parent; 3762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(dentry); 377f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 378f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe /* 379f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe * this will fail for all but the last file, but that is ok. what we 380f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe * care about is the top level buts->name directory going away, when 381f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe * the last trace file is gone. Then we don't have to rmdir() that 382f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe * manually on trace stop, so it nicely solves the issue with 383f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe * force killing of running traces. 384f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe */ 385f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 386f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe debugfs_remove(parent); 3872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct dentry *blk_create_buf_file_callback(const char *filename, 3912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct dentry *parent, 3922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int mode, 3932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct rchan_buf *buf, 3942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int *is_global) 3952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return debugfs_create_file(filename, mode, parent, buf, 3972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe &relay_file_operations); 3982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct rchan_callbacks blk_relay_callbacks = { 4012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .subbuf_start = blk_subbuf_start_callback, 4022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .create_buf_file = blk_create_buf_file_callback, 4032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .remove_buf_file = blk_remove_buf_file_callback, 4042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe}; 4052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 4072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Setup everything required to start tracing 4082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 4096da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 410171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann struct blk_user_trace_setup *buts) 4112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 4122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *old_bt, *bt = NULL; 4132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct dentry *dir = NULL; 4142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret, i; 4152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 416171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (!buts->buf_size || !buts->buf_nr) 4172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 4182056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4190497b345e7d067109e0dd9bf9f4978a6847ee13bJens Axboe strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); 4200497b345e7d067109e0dd9bf9f4978a6847ee13bJens Axboe buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; 4212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 4232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * some device names have larger paths - convert the slashes 4242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * to underscores for this to work as expected 4252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 426171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann for (i = 0; i < strlen(buts->name); i++) 427171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (buts->name[i] == '/') 428171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann buts->name[i] = '_'; 4292056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = kzalloc(sizeof(*bt), GFP_KERNEL); 4312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt) 432ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan return -ENOMEM; 4332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 434ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan ret = -ENOMEM; 4352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->sequence = alloc_percpu(unsigned long); 4362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->sequence) 4372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4382056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 439f0ef03985130287c6c84ebe69416cf790e6cc00eIngo Molnar bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 44064565911cdb57c2f512a9715b985b5617402cc67Jens Axboe if (!bt->msg_data) 44164565911cdb57c2f512a9715b985b5617402cc67Jens Axboe goto err; 44264565911cdb57c2f512a9715b985b5617402cc67Jens Axboe 4432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOENT; 444f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 445b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_lock(&blk_tree_mutex); 446f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe if (!blk_tree_root) { 447f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe blk_tree_root = debugfs_create_dir("block", NULL); 448b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan if (!blk_tree_root) { 449b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_unlock(&blk_tree_mutex); 4501a17662ea033674a58bad3603531b0b5d42572f6Li Zefan goto err; 451b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan } 452f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe } 453b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_unlock(&blk_tree_mutex); 454f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 455f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe dir = debugfs_create_dir(buts->name, blk_tree_root); 456f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 4572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!dir) 4582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->dir = dir; 4616da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt bt->dev = dev; 4622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe atomic_set(&bt->dropped, 0); 4632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EIO; 465939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, 466939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo &blk_dropped_fops); 4672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->dropped_file) 4682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 47002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); 47102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (!bt->msg_file) 47202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle goto err; 47302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 474171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->rchan = relay_open("trace", dir, buts->buf_size, 475171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann buts->buf_nr, &blk_relay_callbacks, bt); 4762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->rchan) 4772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 479171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->act_mask = buts->act_mask; 4802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->act_mask) 4812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->act_mask = (u16) -1; 4822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 483171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->start_lba = buts->start_lba; 484171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->end_lba = buts->end_lba; 4852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->end_lba) 4862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->end_lba = -1ULL; 4872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 488171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->pid = buts->pid; 4892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_setup; 4902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EBUSY; 4922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe old_bt = xchg(&q->blk_trace, bt); 4932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (old_bt) { 4942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe (void) xchg(&q->blk_trace, old_bt); 4952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 4972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 49817ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 499cbe28296eb1ac441b35cf45804d0ae808add7dd1Li Zefan blk_register_tracepoints(); 500cbe28296eb1ac441b35cf45804d0ae808add7dd1Li Zefan 5012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 5022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboeerr: 503ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 5042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 5052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 506171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 5076da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 5086da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt char __user *arg) 509171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann{ 510171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann struct blk_user_trace_setup buts; 511171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann int ret; 512171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 513171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann ret = copy_from_user(&buts, arg, sizeof(buts)); 514171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (ret) 515171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return -EFAULT; 516171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 5176da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt ret = do_blk_trace_setup(q, name, dev, &buts); 518171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (ret) 519171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return ret; 520171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 521171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (copy_to_user(arg, &buts, sizeof(buts))) 522171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return -EFAULT; 523171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 524171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return 0; 525171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann} 5266da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_setup); 5272056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5286da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_startstop(struct request_queue *q, int start) 5292056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 5302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret; 531939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 5322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 533939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo if (bt == NULL) 5342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 5352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 5372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * For starting a trace, we can transition from a setup or stopped 5382056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * trace. For stopping a trace, the state must be running 5392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 5402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EINVAL; 5412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (start) { 5422056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_setup || 5432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state == Blktrace_stopped) { 5442056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe blktrace_seq++; 5452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe smp_mb(); 5462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_running; 547be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 548be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch trace_note_time(bt); 5492056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = 0; 5502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } else { 5522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_running) { 5532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_stopped; 5542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe relay_flush(bt->rchan); 5552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = 0; 5562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 5602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 5616da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_startstop); 5622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/** 5642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_trace_ioctl: - handle the ioctls associated with tracing 5652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @bdev: the block device 566ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt * @cmd: the ioctl cmd 5672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @arg: the argument data, if any 5682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 5692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe **/ 5702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboeint blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) 5712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 572165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboe struct request_queue *q; 5732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret, start = 0; 5746da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt char b[BDEVNAME_SIZE]; 5752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe q = bdev_get_queue(bdev); 5772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!q) 5782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -ENXIO; 5792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe mutex_lock(&bdev->bd_mutex); 5812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe switch (cmd) { 5832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESETUP: 584f36f21ecca9ee688301174e5f2e0827827a7a7ffJean Delvare bdevname(bdev, b); 5856da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt ret = blk_trace_setup(q, b, bdev->bd_dev, arg); 5862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 5872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESTART: 5882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe start = 1; 5892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESTOP: 5902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = blk_trace_startstop(q, start); 5912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 5922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACETEARDOWN: 5932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = blk_trace_remove(q); 5942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 5952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe default: 5962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOTTY; 5972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 5982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe mutex_unlock(&bdev->bd_mutex); 6012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 6022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/** 6052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_trace_shutdown: - stop and cleanup trace structures 6062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @q: the request queue associated with the device 6072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 6082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe **/ 609165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboevoid blk_trace_shutdown(struct request_queue *q) 6102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 6116c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan if (q->blk_trace) { 6126c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan blk_trace_startstop(q, 0); 6136c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan blk_trace_remove(q); 6146c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan } 6152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/* 6185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blktrace probes 6195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo */ 6205f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 6225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_rq - Add a trace for a request oriented action 6235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 6245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @rq: the source request 6255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @what: the action 6265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 6285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Records an action against a request. Will log the bio offset + size. 6295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 6315f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq(struct request_queue *q, struct request *rq, 6325f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo u32 what) 6335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 6355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo int rw = rq->cmd_flags & 0x03; 6365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 6385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 6395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (blk_discard_rq(rq)) 6415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo rw |= (1 << BIO_RW_DISCARD); 6425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (blk_pc_request(rq)) { 6445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo what |= BLK_TC_ACT(BLK_TC_PC); 6455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, 646e2494e1b42ebac402324105d57646489d19e2b01Li Zefan rq->cmd_len, rq->cmd); 6475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } else { 6485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo what |= BLK_TC_ACT(BLK_TC_FS); 6495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9, 6505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo rw, what, rq->errors, 0, NULL); 6515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 6525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq_abort(struct request_queue *q, struct request *rq) 6555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_ABORT); 6575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq_insert(struct request_queue *q, struct request *rq) 6605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_INSERT); 6625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq_issue(struct request_queue *q, struct request *rq) 6655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_ISSUE); 6675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 669939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_rq_requeue(struct request_queue *q, 670939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct request *rq) 6715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_REQUEUE); 6735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 675939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_rq_complete(struct request_queue *q, 676939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct request *rq) 6775f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_COMPLETE); 6795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 6825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_bio - Add a trace for a bio oriented action 6835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 6845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @bio: the source bio 6855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @what: the action 6865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 6885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Records an action against a bio. Will log the bio offset + size. 6895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 6915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio(struct request_queue *q, struct bio *bio, 6925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo u32 what) 6935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 6955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 6975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 6985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, 7005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo !bio_flagged(bio, BIO_UPTODATE), 0, NULL); 7015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio_bounce(struct request_queue *q, struct bio *bio) 7045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_BOUNCE); 7065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio_complete(struct request_queue *q, struct bio *bio) 7095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_COMPLETE); 7115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 713939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_bio_backmerge(struct request_queue *q, 714939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio) 7155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE); 7175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 719939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_bio_frontmerge(struct request_queue *q, 720939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio) 7215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE); 7235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio_queue(struct request_queue *q, struct bio *bio) 7265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_QUEUE); 7285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 730939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_getrq(struct request_queue *q, 731939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio, int rw) 7325f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bio) 7345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_GETRQ); 7355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else { 7365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 7395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL); 7405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 744939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_sleeprq(struct request_queue *q, 745939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio, int rw) 7465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bio) 7485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ); 7495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else { 7505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 753939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ, 754939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo 0, 0, NULL); 7555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_plug(struct request_queue *q) 7595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 7635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL); 7645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_unplug_io(struct request_queue *q) 7675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 7715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 7725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 7735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_IO, 0, 7755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 7765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7775f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_unplug_timer(struct request_queue *q) 7805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 7845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 7855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 7865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_TIMER, 0, 7885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 7895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_split(struct request_queue *q, struct bio *bio, 7935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu) 7945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 7985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 7995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 8015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE), 8025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 8035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 8075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_remap - Add a trace for a remap operation 8085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 8095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @bio: the source bio 8105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @dev: target device 8115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @from: source sector 8125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @to: target sector 8135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 8155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Device mapper or raid target sometimes need to split a bio because 8165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * it spans a stripe (or similar). Add a trace for that action. 8175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 8195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_remap(struct request_queue *q, struct bio *bio, 8205f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo dev_t dev, sector_t from, sector_t to) 8215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_io_trace_remap r; 8245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 8265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 8275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo r.device = cpu_to_be32(dev); 8295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo r.device_from = cpu_to_be32(bio->bi_bdev->bd_dev); 8305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo r.sector = cpu_to_be64(to); 8315f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8325f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP, 8335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r); 8345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 8375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_driver_data - Add binary message with driver-specific data 8385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 8395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @rq: io request 8405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @data: driver-specific data 8415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @len: length of driver-specific data 8425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 8445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Some drivers might want to write driver-specific data per request. 8455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 8475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melovoid blk_add_driver_data(struct request_queue *q, 8485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct request *rq, 8495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo void *data, size_t len) 8505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 8545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 8555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (blk_pc_request(rq)) 8575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA, 8585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo rq->errors, len, data); 8595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else 8605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9, 8615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 0, BLK_TA_DRV_DATA, rq->errors, len, data); 8625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(blk_add_driver_data); 8645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8653c289ba7c320560ee74979a8895141c829046a2dLi Zefanstatic void blk_register_tracepoints(void) 8665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo int ret; 8685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_abort(blk_add_trace_rq_abort); 8705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_insert(blk_add_trace_rq_insert); 8725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_issue(blk_add_trace_rq_issue); 8745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue); 8765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8775f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_complete(blk_add_trace_rq_complete); 8785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce); 8805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_complete(blk_add_trace_bio_complete); 8825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge); 8845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge); 8865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_queue(blk_add_trace_bio_queue); 8885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_getrq(blk_add_trace_getrq); 8905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_sleeprq(blk_add_trace_sleeprq); 8925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_plug(blk_add_trace_plug); 8945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_unplug_timer(blk_add_trace_unplug_timer); 8965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_unplug_io(blk_add_trace_unplug_io); 8985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 8995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_split(blk_add_trace_split); 9005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_remap(blk_add_trace_remap); 9025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 9045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_unregister_tracepoints(void) 9065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 9075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_remap(blk_add_trace_remap); 9085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_split(blk_add_trace_split); 9095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_unplug_io(blk_add_trace_unplug_io); 9105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_unplug_timer(blk_add_trace_unplug_timer); 9115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_plug(blk_add_trace_plug); 9125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_sleeprq(blk_add_trace_sleeprq); 9135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_getrq(blk_add_trace_getrq); 9145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_queue(blk_add_trace_bio_queue); 9155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge); 9165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge); 9175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_complete(blk_add_trace_bio_complete); 9185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce); 9195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_complete(blk_add_trace_rq_complete); 9205f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue); 9215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_issue(blk_add_trace_rq_issue); 9225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_insert(blk_add_trace_rq_insert); 9235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_abort(blk_add_trace_rq_abort); 9245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo tracepoint_synchronize_unregister(); 9265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 927c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 928c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 929c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * struct blk_io_tracer formatting routines 930c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 931c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 932c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void fill_rwbs(char *rwbs, const struct blk_io_trace *t) 933c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 934157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo int i = 0; 93565796348e09880e12b97267d39b8857c758440a6Li Zefan int tc = t->action >> BLK_TC_SHIFT; 936157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 93718cea4591a98817697017bcb056a848bae1205dfLi Zefan if (t->action == BLK_TN_MESSAGE) { 93818cea4591a98817697017bcb056a848bae1205dfLi Zefan rwbs[i++] = 'N'; 93918cea4591a98817697017bcb056a848bae1205dfLi Zefan goto out; 94018cea4591a98817697017bcb056a848bae1205dfLi Zefan } 94118cea4591a98817697017bcb056a848bae1205dfLi Zefan 94265796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_DISCARD) 943157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'D'; 94465796348e09880e12b97267d39b8857c758440a6Li Zefan else if (tc & BLK_TC_WRITE) 945157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'W'; 946157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else if (t->bytes) 947157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'R'; 948157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else 949157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'N'; 950157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 95165796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_AHEAD) 952157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'A'; 95365796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_BARRIER) 954157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'B'; 95565796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_SYNC) 956157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'S'; 95765796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_META) 958157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'M'; 95918cea4591a98817697017bcb056a848bae1205dfLi Zefanout: 960157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i] = '\0'; 961c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 962c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 963c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline 964c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloconst struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) 965c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 966c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return (const struct blk_io_trace *)ent; 967c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 968c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 969c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline const void *pdu_start(const struct trace_entry *ent) 970c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 971c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent) + 1; 972c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 973c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 974c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline u32 t_sec(const struct trace_entry *ent) 975c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 976c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->bytes >> 9; 977c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 978c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 979c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline unsigned long long t_sector(const struct trace_entry *ent) 980c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 981c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->sector; 982c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 983c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 984c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline __u16 t_error(const struct trace_entry *ent) 985c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 986e0dc81bec0927fa0c8aabc521793161909eef7a5Li Zefan return te_blk_io_trace(ent)->error; 987c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 988c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 989c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic __u64 get_pdu_int(const struct trace_entry *ent) 990c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 991c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const __u64 *val = pdu_start(ent); 992c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return be64_to_cpu(*val); 993c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 994c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 995c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void get_pdu_remap(const struct trace_entry *ent, 996c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_io_trace_remap *r) 997c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 998c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const struct blk_io_trace_remap *__r = pdu_start(ent); 999c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo __u64 sector = __r->sector; 1000c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1001c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo r->device = be32_to_cpu(__r->device); 1002c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo r->device_from = be32_to_cpu(__r->device_from); 1003c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo r->sector = be64_to_cpu(sector); 1004c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1005c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1006b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefantypedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act); 1007b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 1008b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic int blk_log_action_classic(struct trace_iterator *iter, const char *act) 1009c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1010c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char rwbs[6]; 101135ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan unsigned long long ts = iter->ts; 101235ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); 1013c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unsigned secs = (unsigned long)ts; 1014b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1015c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1016c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo fill_rwbs(rwbs, t); 1017c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1018c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(&iter->seq, 101935ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", 1020c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo MAJOR(t->device), MINOR(t->device), iter->cpu, 1021b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan secs, nsec_rem, iter->ent->pid, act, rwbs); 1022c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1023c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1024b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic int blk_log_action(struct trace_iterator *iter, const char *act) 1025c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1026c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char rwbs[6]; 1027b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1028b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 1029c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo fill_rwbs(rwbs, t); 1030b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", 1031c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo MAJOR(t->device), MINOR(t->device), act, rwbs); 1032c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1033c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1034c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent) 1035c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 10364ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 10374ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10384ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 1039c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1040c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (t_sec(ent)) 1041c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu + %u [%s]\n", 1042c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo t_sector(ent), t_sec(ent), cmd); 1043c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "[%s]\n", cmd); 1044c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1045c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1046157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melostatic int blk_log_with_error(struct trace_seq *s, 1047157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo const struct trace_entry *ent) 1048c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1049c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (t_sec(ent)) 1050c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu + %u [%d]\n", t_sector(ent), 1051c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo t_sec(ent), t_error(ent)); 1052c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu [%d]\n", t_sector(ent), t_error(ent)); 1053c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1054c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1055c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent) 1056c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1057c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_io_trace_remap r = { .device = 0, }; 1058c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1059c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo get_pdu_remap(ent, &r); 1060c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", 1061c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo t_sector(ent), 1062c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo t_sec(ent), MAJOR(r.device), MINOR(r.device), 1063c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo (unsigned long long)r.sector); 1064c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1065c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1066c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent) 1067c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 10684ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 10694ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10704ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 10714ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10724ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt return trace_seq_printf(s, "[%s]\n", cmd); 1073c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1074c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1075c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent) 1076c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 10774ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 10784ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10794ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 10804ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10814ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent)); 1082c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1083c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1084c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_split(struct trace_seq *s, const struct trace_entry *ent) 1085c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 10864ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 10874ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 10884ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 10894ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 1090c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), 10914ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt get_pdu_int(ent), cmd); 1092c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1093c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 109418cea4591a98817697017bcb056a848bae1205dfLi Zefanstatic int blk_log_msg(struct trace_seq *s, const struct trace_entry *ent) 109518cea4591a98817697017bcb056a848bae1205dfLi Zefan{ 109618cea4591a98817697017bcb056a848bae1205dfLi Zefan int ret; 109718cea4591a98817697017bcb056a848bae1205dfLi Zefan const struct blk_io_trace *t = te_blk_io_trace(ent); 109818cea4591a98817697017bcb056a848bae1205dfLi Zefan 109918cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = trace_seq_putmem(s, t + 1, t->pdu_len); 110018cea4591a98817697017bcb056a848bae1205dfLi Zefan if (ret) 110118cea4591a98817697017bcb056a848bae1205dfLi Zefan return trace_seq_putc(s, '\n'); 110218cea4591a98817697017bcb056a848bae1205dfLi Zefan return ret; 110318cea4591a98817697017bcb056a848bae1205dfLi Zefan} 110418cea4591a98817697017bcb056a848bae1205dfLi Zefan 1105c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1106c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * struct tracer operations 1107c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1108c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1109c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_print_header(struct seq_file *m) 1110c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1111c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 1112c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 1113c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" 1114c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo "# | | | | | |\n"); 1115c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1116c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1117c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_start(struct trace_array *tr) 1118c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1119ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_tracer_enabled = true; 112008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo trace_flags &= ~TRACE_ITER_CONTEXT_INFO; 1121c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1122c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1123c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_tracer_init(struct trace_array *tr) 1124c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1125c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tr = tr; 1126c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_start(tr); 1127c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1128c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1129c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1130c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_stop(struct trace_array *tr) 1131c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1132ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_tracer_enabled = false; 113308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo trace_flags |= TRACE_ITER_CONTEXT_INFO; 1134c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1135c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1136c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_reset(struct trace_array *tr) 1137c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1138c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_stop(tr); 1139c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1140c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1141e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefanstatic const struct { 1142c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *act[2]; 1143ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt int (*print)(struct trace_seq *s, const struct trace_entry *ent); 1144e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefan} what2act[] = { 1145ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, 1146c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, 1147c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, 1148c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, 1149c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, 1150c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, 1151c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, 1152c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, 1153c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, 1154c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, 1155c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, 1156c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, 1157c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, 1158c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, 1159c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, 1160c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1161c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1162b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic enum print_line_t print_one_line(struct trace_iterator *iter, 1163b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan bool classic) 1164c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 11652c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo struct trace_seq *s = &iter->seq; 1166b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t; 1167b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan u16 what; 1168c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int ret; 1169b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan bool long_act; 1170b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan blk_log_action_t *log_action; 1171c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1172b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan t = te_blk_io_trace(iter->ent); 1173b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan what = t->action & ((1 << BLK_TC_SHIFT) - 1); 1174b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan long_act = !!(trace_flags & TRACE_ITER_VERBOSE); 1175b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan log_action = classic ? &blk_log_action_classic : &blk_log_action; 117608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 117718cea4591a98817697017bcb056a848bae1205dfLi Zefan if (t->action == BLK_TN_MESSAGE) { 117818cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = log_action(iter, long_act ? "message" : "m"); 117918cea4591a98817697017bcb056a848bae1205dfLi Zefan if (ret) 118018cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = blk_log_msg(s, iter->ent); 118118cea4591a98817697017bcb056a848bae1205dfLi Zefan goto out; 118218cea4591a98817697017bcb056a848bae1205dfLi Zefan } 118318cea4591a98817697017bcb056a848bae1205dfLi Zefan 1184eb08f8eb0673d9c1e62b69ad1b41593e73c40467Li Zefan if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) 1185b78825d608f30a47e3154ab6872a03f0de0c9d45Li Zefan ret = trace_seq_printf(s, "Unknown action %x\n", what); 1186c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else { 1187b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan ret = log_action(iter, what2act[what].act[long_act]); 1188c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret) 11892c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo ret = what2act[what].print(s, iter->ent); 1190c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 119118cea4591a98817697017bcb056a848bae1205dfLi Zefanout: 1192c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 1193c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1194c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1195b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic enum print_line_t blk_trace_event_print(struct trace_iterator *iter, 1196b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan int flags) 1197b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan{ 1198b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan if (!trace_print_context(iter)) 1199b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return TRACE_TYPE_PARTIAL_LINE; 1200b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 1201b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return print_one_line(iter, false); 1202b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan} 1203b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 120408a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melostatic int blk_trace_synthesize_old_trace(struct trace_iterator *iter) 120508a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo{ 120608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct trace_seq *s = &iter->seq; 120708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; 120808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo const int offset = offsetof(struct blk_io_trace, sector); 120908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct blk_io_trace old = { 121008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, 12116c051ce0307526adec32a847f0daa1af2124f0a9Li Zefan .time = iter->ts, 121208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo }; 121308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 121408a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo if (!trace_seq_putmem(s, &old, offset)) 121508a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return 0; 121608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return trace_seq_putmem(s, &t->sector, 121708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo sizeof(old) - offset + t->pdu_len); 121808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo} 121908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1220ae7462b4f1fe1f36b5d562dbd5202a2eba01f072Arnaldo Carvalho de Melostatic enum print_line_t 1221ae7462b4f1fe1f36b5d562dbd5202a2eba01f072Arnaldo Carvalho de Meloblk_trace_event_print_binary(struct trace_iterator *iter, int flags) 122208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo{ 122308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return blk_trace_synthesize_old_trace(iter) ? 122408a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 122508a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo} 122608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1227c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) 1228c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1229c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 1230c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return TRACE_TYPE_UNHANDLED; 1231c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1232b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return print_one_line(iter, true); 1233c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1234c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1235c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer blk_tracer __read_mostly = { 1236c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .name = "blk", 1237c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .init = blk_tracer_init, 1238c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .reset = blk_tracer_reset, 1239c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .start = blk_tracer_start, 1240c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .stop = blk_tracer_stop, 1241c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .print_header = blk_tracer_print_header, 1242c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .print_line = blk_tracer_print_line, 1243c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .flags = &blk_tracer_flags, 1244c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1245c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1246c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct trace_event trace_blk_event = { 1247ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt .type = TRACE_BLK, 1248c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .trace = blk_trace_event_print, 124908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .binary = blk_trace_event_print_binary, 1250c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1251c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1252c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int __init init_blk_tracer(void) 1253c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1254c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!register_ftrace_event(&trace_blk_event)) { 1255c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo pr_warning("Warning: could not register block events\n"); 1256c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 1; 1257c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1258c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1259c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (register_tracer(&blk_tracer) != 0) { 1260c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo pr_warning("Warning: could not register the block tracer\n"); 1261c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unregister_ftrace_event(&trace_blk_event); 1262c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 1; 1263c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1264c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1265c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1266c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1267c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1268c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melodevice_initcall(init_blk_tracer); 1269c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1270c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_trace_remove_queue(struct request_queue *q) 1271c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1272c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_trace *bt; 1273c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1274c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt = xchg(&q->blk_trace, NULL); 1275c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bt == NULL) 1276c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return -EINVAL; 1277c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 127817ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_dec_and_test(&blk_probes_ref)) 127917ba97e347bec9bbc47a0877c7a098708982129dLi Zefan blk_unregister_tracepoints(); 128017ba97e347bec9bbc47a0877c7a098708982129dLi Zefan 1281ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 1282c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1283c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1284c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1285c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1286c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * Setup everything required to start tracing 1287c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1288c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_trace_setup_queue(struct request_queue *q, dev_t dev) 1289c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1290c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_trace *old_bt, *bt = NULL; 129118cea4591a98817697017bcb056a848bae1205dfLi Zefan int ret = -ENOMEM; 1292c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1293c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt = kzalloc(sizeof(*bt), GFP_KERNEL); 1294c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!bt) 129515152e448b693fa41de40f1e40ffbe717a3aab88Li Zefan return -ENOMEM; 1296c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 129718cea4591a98817697017bcb056a848bae1205dfLi Zefan bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 129818cea4591a98817697017bcb056a848bae1205dfLi Zefan if (!bt->msg_data) 129918cea4591a98817697017bcb056a848bae1205dfLi Zefan goto free_bt; 130018cea4591a98817697017bcb056a848bae1205dfLi Zefan 1301c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt->dev = dev; 1302c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt->act_mask = (u16)-1; 1303c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt->end_lba = -1ULL; 1304c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1305c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo old_bt = xchg(&q->blk_trace, bt); 1306c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (old_bt != NULL) { 1307c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo (void)xchg(&q->blk_trace, old_bt); 130818cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = -EBUSY; 130918cea4591a98817697017bcb056a848bae1205dfLi Zefan goto free_bt; 1310c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 131115152e448b693fa41de40f1e40ffbe717a3aab88Li Zefan 131217ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 131317ba97e347bec9bbc47a0877c7a098708982129dLi Zefan blk_register_tracepoints(); 1314c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 131518cea4591a98817697017bcb056a848bae1205dfLi Zefan 131618cea4591a98817697017bcb056a848bae1205dfLi Zefanfree_bt: 131718cea4591a98817697017bcb056a848bae1205dfLi Zefan blk_trace_free(bt); 131818cea4591a98817697017bcb056a848bae1205dfLi Zefan return ret; 1319c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1320c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1321c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1322c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * sysfs interface to enable and configure tracing 1323c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1324c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1325c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_show(struct device *dev, 1326c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1327c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf); 1328c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_store(struct device *dev, 1329c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1330c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count); 1331c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo#define BLK_TRACE_DEVICE_ATTR(_name) \ 1332c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ 1333c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_attr_show, \ 1334c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_attr_store) 1335c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1336cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanstatic BLK_TRACE_DEVICE_ATTR(enable); 1337c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(act_mask); 1338c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(pid); 1339c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(start_lba); 1340c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(end_lba); 1341c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1342c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct attribute *blk_trace_attrs[] = { 1343c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_enable.attr, 1344c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_act_mask.attr, 1345c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_pid.attr, 1346c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_start_lba.attr, 1347c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_end_lba.attr, 1348c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo NULL 1349c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1350c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1351c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostruct attribute_group blk_trace_attr_group = { 1352c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .name = "trace", 1353c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .attrs = blk_trace_attrs, 1354c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1355c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1356093419971e03362a00f499960557c119982ea09fLi Zefanstatic const struct { 1357093419971e03362a00f499960557c119982ea09fLi Zefan int mask; 1358093419971e03362a00f499960557c119982ea09fLi Zefan const char *str; 1359093419971e03362a00f499960557c119982ea09fLi Zefan} mask_maps[] = { 1360093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_READ, "read" }, 1361093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_WRITE, "write" }, 1362093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_BARRIER, "barrier" }, 1363093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_SYNC, "sync" }, 1364093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_QUEUE, "queue" }, 1365093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_REQUEUE, "requeue" }, 1366093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_ISSUE, "issue" }, 1367093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_COMPLETE, "complete" }, 1368093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_FS, "fs" }, 1369093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_PC, "pc" }, 1370093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_AHEAD, "ahead" }, 1371093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_META, "meta" }, 1372093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_DISCARD, "discard" }, 1373093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_DRV_DATA, "drv_data" }, 1374093419971e03362a00f499960557c119982ea09fLi Zefan}; 1375093419971e03362a00f499960557c119982ea09fLi Zefan 1376093419971e03362a00f499960557c119982ea09fLi Zefanstatic int blk_trace_str2mask(const char *str) 1377c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1378093419971e03362a00f499960557c119982ea09fLi Zefan int i; 1379c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int mask = 0; 13809eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan char *buf, *s, *token; 1381c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 13829eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan buf = kstrdup(str, GFP_KERNEL); 13839eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan if (buf == NULL) 1384c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return -ENOMEM; 13859eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan s = strstrip(buf); 1386c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1387c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo while (1) { 1388093419971e03362a00f499960557c119982ea09fLi Zefan token = strsep(&s, ","); 1389093419971e03362a00f499960557c119982ea09fLi Zefan if (token == NULL) 1390c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo break; 1391c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1392093419971e03362a00f499960557c119982ea09fLi Zefan if (*token == '\0') 1393093419971e03362a00f499960557c119982ea09fLi Zefan continue; 1394093419971e03362a00f499960557c119982ea09fLi Zefan 1395093419971e03362a00f499960557c119982ea09fLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 1396093419971e03362a00f499960557c119982ea09fLi Zefan if (strcasecmp(token, mask_maps[i].str) == 0) { 1397093419971e03362a00f499960557c119982ea09fLi Zefan mask |= mask_maps[i].mask; 1398093419971e03362a00f499960557c119982ea09fLi Zefan break; 1399093419971e03362a00f499960557c119982ea09fLi Zefan } 1400093419971e03362a00f499960557c119982ea09fLi Zefan } 1401093419971e03362a00f499960557c119982ea09fLi Zefan if (i == ARRAY_SIZE(mask_maps)) { 1402093419971e03362a00f499960557c119982ea09fLi Zefan mask = -EINVAL; 1403093419971e03362a00f499960557c119982ea09fLi Zefan break; 1404093419971e03362a00f499960557c119982ea09fLi Zefan } 1405c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 14069eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan kfree(buf); 1407c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1408c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return mask; 1409c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1410c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1411093419971e03362a00f499960557c119982ea09fLi Zefanstatic ssize_t blk_trace_mask2str(char *buf, int mask) 1412093419971e03362a00f499960557c119982ea09fLi Zefan{ 1413093419971e03362a00f499960557c119982ea09fLi Zefan int i; 1414093419971e03362a00f499960557c119982ea09fLi Zefan char *p = buf; 1415093419971e03362a00f499960557c119982ea09fLi Zefan 1416093419971e03362a00f499960557c119982ea09fLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 1417093419971e03362a00f499960557c119982ea09fLi Zefan if (mask & mask_maps[i].mask) { 1418093419971e03362a00f499960557c119982ea09fLi Zefan p += sprintf(p, "%s%s", 1419093419971e03362a00f499960557c119982ea09fLi Zefan (p == buf) ? "" : ",", mask_maps[i].str); 1420093419971e03362a00f499960557c119982ea09fLi Zefan } 1421093419971e03362a00f499960557c119982ea09fLi Zefan } 1422093419971e03362a00f499960557c119982ea09fLi Zefan *p++ = '\n'; 1423093419971e03362a00f499960557c119982ea09fLi Zefan 1424093419971e03362a00f499960557c119982ea09fLi Zefan return p - buf; 1425093419971e03362a00f499960557c119982ea09fLi Zefan} 1426093419971e03362a00f499960557c119982ea09fLi Zefan 1427b125130b22d67f249beba10b71a254558b5279d0Li Zefanstatic struct request_queue *blk_trace_get_queue(struct block_device *bdev) 1428b125130b22d67f249beba10b71a254558b5279d0Li Zefan{ 1429b125130b22d67f249beba10b71a254558b5279d0Li Zefan if (bdev->bd_disk == NULL) 1430b125130b22d67f249beba10b71a254558b5279d0Li Zefan return NULL; 1431b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1432b125130b22d67f249beba10b71a254558b5279d0Li Zefan return bdev_get_queue(bdev); 1433b125130b22d67f249beba10b71a254558b5279d0Li Zefan} 1434b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1435c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_show(struct device *dev, 1436c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1437c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf) 1438c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1439c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p = dev_to_part(dev); 1440c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1441c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1442c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ssize_t ret = -ENXIO; 1443c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1444c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo lock_kernel(); 1445c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1446c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 1447c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_unlock_kernel; 1448c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1449b125130b22d67f249beba10b71a254558b5279d0Li Zefan q = blk_trace_get_queue(bdev); 1450c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1451c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1452b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1453c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1454cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1455cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (attr == &dev_attr_enable) { 1456cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan ret = sprintf(buf, "%u\n", !!q->blk_trace); 1457cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan goto out_unlock_bdev; 1458cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan } 1459cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1460c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q->blk_trace == NULL) 1461c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "disabled\n"); 1462c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_act_mask) 1463093419971e03362a00f499960557c119982ea09fLi Zefan ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); 1464c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_pid) 1465c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%u\n", q->blk_trace->pid); 1466c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_start_lba) 1467c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); 1468c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_end_lba) 1469c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); 1470cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1471cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanout_unlock_bdev: 1472c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1473c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1474c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 1475c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_unlock_kernel: 1476c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unlock_kernel(); 1477c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret; 1478c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1479c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1480c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_store(struct device *dev, 1481c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1482c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count) 1483c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1484c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1485c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1486c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p; 1487c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo u64 value; 1488093419971e03362a00f499960557c119982ea09fLi Zefan ssize_t ret = -EINVAL; 1489c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1490c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (count == 0) 1491c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1492c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1493c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (attr == &dev_attr_act_mask) { 1494c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (sscanf(buf, "%llx", &value) != 1) { 1495c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo /* Assume it is a list of trace category names */ 1496093419971e03362a00f499960557c119982ea09fLi Zefan ret = blk_trace_str2mask(buf); 1497093419971e03362a00f499960557c119982ea09fLi Zefan if (ret < 0) 1498c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1499093419971e03362a00f499960557c119982ea09fLi Zefan value = ret; 1500c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1501c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } else if (sscanf(buf, "%llu", &value) != 1) 1502c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1503c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1504093419971e03362a00f499960557c119982ea09fLi Zefan ret = -ENXIO; 1505093419971e03362a00f499960557c119982ea09fLi Zefan 1506c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo lock_kernel(); 1507c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo p = dev_to_part(dev); 1508c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1509c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 1510c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_unlock_kernel; 1511c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1512b125130b22d67f249beba10b71a254558b5279d0Li Zefan q = blk_trace_get_queue(bdev); 1513c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1514c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1515c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1516c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1517cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1518cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (attr == &dev_attr_enable) { 1519cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (value) 1520cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan ret = blk_trace_setup_queue(q, bdev->bd_dev); 1521cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan else 1522cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan ret = blk_trace_remove_queue(q); 1523cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan goto out_unlock_bdev; 1524cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan } 1525cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1526c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = 0; 1527c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q->blk_trace == NULL) 1528c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = blk_trace_setup_queue(q, bdev->bd_dev); 1529c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1530c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret == 0) { 1531c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (attr == &dev_attr_act_mask) 1532c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->act_mask = value; 1533c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_pid) 1534c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->pid = value; 1535c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_start_lba) 1536c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->start_lba = value; 1537c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_end_lba) 1538c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->end_lba = value; 1539c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1540cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1541cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanout_unlock_bdev: 1542c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1543c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1544c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 1545c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_unlock_kernel: 1546c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unlock_kernel(); 1547c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout: 1548cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan return ret ? ret : count; 1549c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1550cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1551