blktrace.c revision d8a0349c0cea477322c66ea9362f10c62fad5f62
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> 245a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe#include <linux/debugfs.h> 266e5fdeedca610df600aabc393c4b1f44b128fe49Paul Gortmaker#include <linux/export.h> 27be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch#include <linux/time.h> 28939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo#include <linux/uaccess.h> 2955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 3055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#include <trace/events/block.h> 3155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 322db270a80b8f2238e536876cfb3987af02684df8Frederic Weisbecker#include "trace_output.h" 332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#ifdef CONFIG_BLK_DEV_IO_TRACE 3555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic unsigned int blktrace_seq __read_mostly = 1; 372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 38c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct trace_array *blk_tr; 395006ea73f38caef6065d1136808413813271633fLi Zefanstatic bool blk_tracer_enabled __read_mostly; 40c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 41c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* Select an alternative, minimalistic output than the original one */ 42ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt#define TRACE_BLK_OPT_CLASSIC 0x1 43c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 44c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer_opt blk_tracer_opts[] = { 45c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo /* Default disable the minimalistic output */ 46157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) }, 47c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo { } 48c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 49c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 50c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer_flags blk_tracer_flags = { 51c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .val = 0, 52c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .opts = blk_tracer_opts, 53c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 54c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/* Global reference count of probes */ 565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic atomic_t blk_probes_ref = ATOMIC_INIT(0); 575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 583c289ba7c320560ee74979a8895141c829046a2dLi Zefanstatic void blk_register_tracepoints(void); 595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_unregister_tracepoints(void); 605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 62be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch * Send out a notify message. 63be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch */ 64a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboestatic void trace_note(struct blk_trace *bt, pid_t pid, int action, 65a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe const void *data, size_t len) 66be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch{ 67be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch struct blk_io_trace *t; 6818cea4591a98817697017bcb056a848bae1205dfLi Zefan struct ring_buffer_event *event = NULL; 69e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt struct ring_buffer *buffer = NULL; 7018cea4591a98817697017bcb056a848bae1205dfLi Zefan int pc = 0; 7118cea4591a98817697017bcb056a848bae1205dfLi Zefan int cpu = smp_processor_id(); 7218cea4591a98817697017bcb056a848bae1205dfLi Zefan bool blk_tracer = blk_tracer_enabled; 7318cea4591a98817697017bcb056a848bae1205dfLi Zefan 7418cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 75e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt buffer = blk_tr->buffer; 7618cea4591a98817697017bcb056a848bae1205dfLi Zefan pc = preempt_count(); 77e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BLK, 7818cea4591a98817697017bcb056a848bae1205dfLi Zefan sizeof(*t) + len, 7918cea4591a98817697017bcb056a848bae1205dfLi Zefan 0, pc); 8018cea4591a98817697017bcb056a848bae1205dfLi Zefan if (!event) 8118cea4591a98817697017bcb056a848bae1205dfLi Zefan return; 8218cea4591a98817697017bcb056a848bae1205dfLi Zefan t = ring_buffer_event_data(event); 8318cea4591a98817697017bcb056a848bae1205dfLi Zefan goto record_it; 8418cea4591a98817697017bcb056a848bae1205dfLi Zefan } 85be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 86c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!bt->rchan) 87c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 88c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 89be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch t = relay_reserve(bt->rchan, sizeof(*t) + len); 90d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe if (t) { 91d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 922997c8c4a0b179e8b834a7f30ba4323f2c60ccf4Ingo Molnar t->time = ktime_to_ns(ktime_get()); 9318cea4591a98817697017bcb056a848bae1205dfLi Zefanrecord_it: 94d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->device = bt->dev; 95d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->action = action; 96d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->pid = pid; 97d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->cpu = cpu; 98d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->pdu_len = len; 99d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe memcpy((void *) t + sizeof(*t), data, len); 10018cea4591a98817697017bcb056a848bae1205dfLi Zefan 10118cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) 102e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt trace_buffer_unlock_commit(buffer, event, 0, pc); 103d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe } 104be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch} 105be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 106be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch/* 1072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Send out a notify for this process, if we haven't done so since a trace 1082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * started 1092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 1102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk) 1112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 112a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe tsk->btrace_seq = blktrace_seq; 113a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm)); 114be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch} 1152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 116be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirchstatic void trace_note_time(struct blk_trace *bt) 117be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch{ 118be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch struct timespec now; 119be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch unsigned long flags; 120be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch u32 words[2]; 121be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 122be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch getnstimeofday(&now); 123be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch words[0] = now.tv_sec; 124be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch words[1] = now.tv_nsec; 125be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 126be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch local_irq_save(flags); 127be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words)); 128be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch local_irq_restore(flags); 1292056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 1302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1319d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunellevoid __trace_note_message(struct blk_trace *bt, const char *fmt, ...) 1329d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle{ 1339d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle int n; 1349d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_list args; 13514a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde unsigned long flags; 13664565911cdb57c2f512a9715b985b5617402cc67Jens Axboe char *buf; 1379d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 13818cea4591a98817697017bcb056a848bae1205dfLi Zefan if (unlikely(bt->trace_state != Blktrace_running && 13918cea4591a98817697017bcb056a848bae1205dfLi Zefan !blk_tracer_enabled)) 140c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 141c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 142490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma /* 143490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma * If the BLK_TC_NOTIFY action mask isn't set, don't send any note 144490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma * message to the trace. 145490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma */ 146490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma if (!(bt->act_mask & BLK_TC_NOTIFY)) 147490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma return; 148490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma 14914a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde local_irq_save(flags); 150d8a0349c0cea477322c66ea9362f10c62fad5f62Shan Wei buf = this_cpu_ptr(bt->msg_data); 1519d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_start(args, fmt); 15264565911cdb57c2f512a9715b985b5617402cc67Jens Axboe n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); 1539d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_end(args); 1549d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 15564565911cdb57c2f512a9715b985b5617402cc67Jens Axboe trace_note(bt, 0, BLK_TN_MESSAGE, buf, n); 15614a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde local_irq_restore(flags); 1579d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle} 1589d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. BrunelleEXPORT_SYMBOL_GPL(__trace_note_message); 1599d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 1602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, 1612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid_t pid) 1622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 1632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) 1642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 165d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (sector && (sector < bt->start_lba || sector > bt->end_lba)) 1662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->pid && pid != bt->pid) 1682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 1712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 1722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 1742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Data direction bit lookup 1752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 176e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefanstatic const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), 177e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefan BLK_TC_ACT(BLK_TC_WRITE) }; 1782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1797b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig#define BLK_TC_RAHEAD BLK_TC_AHEAD 1807b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig 18135ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse/* The ilog2() calls fall out because they're constant */ 1827b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig#define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \ 1837b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name)) 1842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 1862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * The worker for the various blk_add_trace*() types. Fills out a 1872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_io_trace structure and places it in a per-cpu subbuffer. 1882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 1895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, 1902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int rw, u32 what, int error, int pdu_len, void *pdu_data) 1912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 1922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct task_struct *tsk = current; 193c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct ring_buffer_event *event = NULL; 194e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt struct ring_buffer *buffer = NULL; 1952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_io_trace *t; 1960a9877514c4fed10a70720293b37213dd172ee3eArnaldo Carvalho de Melo unsigned long flags = 0; 1972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe unsigned long *sequence; 1982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid_t pid; 199c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int cpu, pc = 0; 20018cea4591a98817697017bcb056a848bae1205dfLi Zefan bool blk_tracer = blk_tracer_enabled; 2012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 20218cea4591a98817697017bcb056a848bae1205dfLi Zefan if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) 2032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return; 2042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe what |= ddir_act[rw & WRITE]; 2067b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig what |= MASK_TC_BIT(rw, SYNC); 2077b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig what |= MASK_TC_BIT(rw, RAHEAD); 20835ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, META); 20935ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, DISCARD); 210c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim what |= MASK_TC_BIT(rw, FLUSH); 211c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim what |= MASK_TC_BIT(rw, FUA); 2122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid = tsk->pid; 214d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (act_log_check(bt, what, sector, pid)) 2152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return; 216c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo cpu = raw_smp_processor_id(); 217c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 21818cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 219c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo tracing_record_cmdline(current); 220c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 221e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt buffer = blk_tr->buffer; 22251a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo pc = preempt_count(); 223e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BLK, 22451a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo sizeof(*t) + pdu_len, 22551a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo 0, pc); 226c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!event) 227c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 22851a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo t = ring_buffer_event_data(event); 229c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto record_it; 230c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 2312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 2332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * A word about the locking here - we disable interrupts to reserve 2342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * some space in the relay per-cpu buffer, to prevent an irq 23514a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde * from coming in and stepping on our toes. 2362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 2372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe local_irq_save(flags); 2382056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (unlikely(tsk->btrace_seq != blktrace_seq)) 2402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe trace_note_tsk(bt, tsk); 2412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2422056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len); 2432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (t) { 2442056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe sequence = per_cpu_ptr(bt->sequence, cpu); 2452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 2472056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->sequence = ++(*sequence); 2482997c8c4a0b179e8b834a7f30ba4323f2c60ccf4Ingo Molnar t->time = ktime_to_ns(ktime_get()); 249c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melorecord_it: 25008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo /* 251939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * These two are not needed in ftrace as they are in the 252939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * generic trace_entry, filled by tracing_generic_entry_update, 253939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * but for the trace_event->bin() synthesizer benefit we do it 254939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * here too. 255939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo */ 256939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo t->cpu = cpu; 257939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo t->pid = pid; 25808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 2592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->sector = sector; 2602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->bytes = bytes; 2612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->action = what; 2622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->device = bt->dev; 2632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->error = error; 2642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->pdu_len = pdu_len; 2652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (pdu_len) 2672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe memcpy((void *) t + sizeof(*t), pdu_data, pdu_len); 268c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 26918cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 270e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt trace_buffer_unlock_commit(buffer, event, 0, pc); 271c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 272c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 2732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 2742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe local_irq_restore(flags); 2762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct dentry *blk_tree_root; 27911a57153e3377ffdf8cfca2eda9a99063f66b957Jens Axboestatic DEFINE_MUTEX(blk_tree_mutex); 2802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 281ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefanstatic void blk_trace_free(struct blk_trace *bt) 2822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 28302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle debugfs_remove(bt->msg_file); 2842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(bt->dropped_file); 285f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe relay_close(bt->rchan); 28639cbb602b543e477df71dca84b5b2e36f8bd29fcAlan D. Brunelle debugfs_remove(bt->dir); 2872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe free_percpu(bt->sequence); 28864565911cdb57c2f512a9715b985b5617402cc67Jens Axboe free_percpu(bt->msg_data); 2892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe kfree(bt); 290ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan} 291ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan 292ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefanstatic void blk_trace_cleanup(struct blk_trace *bt) 293ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan{ 294ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 2955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (atomic_dec_and_test(&blk_probes_ref)) 2965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_unregister_tracepoints(); 2972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2996da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_remove(struct request_queue *q) 3002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt; 3022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = xchg(&q->blk_trace, NULL); 3042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt) 3052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 3062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3075554720482a631702146a959db22fe417740e0a6Li Zefan if (bt->trace_state != Blktrace_running) 3082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe blk_trace_cleanup(bt); 3092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3126da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_remove); 3132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic ssize_t blk_dropped_read(struct file *filp, char __user *buffer, 3152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe size_t count, loff_t *ppos) 3162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt = filp->private_data; 3182056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe char buf[16]; 3192056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3202056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); 3212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 3232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3252b8693c0617e972fc0b2fd1ebf8de97e15b656c3Arjan van de Venstatic const struct file_operations blk_dropped_fops = { 3262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .owner = THIS_MODULE, 327234e340582901211f40d8c732afc49f0630ecf05Stephen Boyd .open = simple_open, 3282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .read = blk_dropped_read, 3296038f373a3dc1f1c26496e60b6c40b164716f07eArnd Bergmann .llseek = default_llseek, 3302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe}; 3312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 33202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic ssize_t blk_msg_write(struct file *filp, const char __user *buffer, 33302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle size_t count, loff_t *ppos) 33402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle{ 33502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle char *msg; 33602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle struct blk_trace *bt; 33702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 3387635b03adf3d7b84da7649b81efa91e6ebf11b85Li Zefan if (count >= BLK_TN_MAX_MSG) 33902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -EINVAL; 34002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 341a4b3ada83d06554d307dd54abdc62b2e5648264aCarl Henrik Lunde msg = kmalloc(count + 1, GFP_KERNEL); 34202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (msg == NULL) 34302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -ENOMEM; 34402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 34502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (copy_from_user(msg, buffer, count)) { 34602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle kfree(msg); 34702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -EFAULT; 34802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle } 34902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 350a4b3ada83d06554d307dd54abdc62b2e5648264aCarl Henrik Lunde msg[count] = '\0'; 35102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle bt = filp->private_data; 35202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle __trace_note_message(bt, "%s", msg); 35302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle kfree(msg); 35402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 35502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return count; 35602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle} 35702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 35802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic const struct file_operations blk_msg_fops = { 35902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .owner = THIS_MODULE, 360234e340582901211f40d8c732afc49f0630ecf05Stephen Boyd .open = simple_open, 36102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .write = blk_msg_write, 3626038f373a3dc1f1c26496e60b6c40b164716f07eArnd Bergmann .llseek = noop_llseek, 36302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle}; 36402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 3652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 3662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Keep track of how many times we encountered a full subbuffer, to aid 3672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * the user space app in telling how many lost events there were. 3682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 3692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, 3702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe void *prev_subbuf, size_t prev_padding) 3712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt; 3732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!relay_buf_full(buf)) 3752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 3762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = buf->chan->private_data; 3782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe atomic_inc(&bt->dropped); 3792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_remove_buf_file_callback(struct dentry *dentry) 3832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(dentry); 385f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 3862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct dentry *blk_create_buf_file_callback(const char *filename, 3902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct dentry *parent, 391f4ae40a6a50a98ac23d4b285f739455e926a473eAl Viro umode_t mode, 3922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct rchan_buf *buf, 3932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int *is_global) 3942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return debugfs_create_file(filename, mode, parent, buf, 3962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe &relay_file_operations); 3972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct rchan_callbacks blk_relay_callbacks = { 4002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .subbuf_start = blk_subbuf_start_callback, 4012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .create_buf_file = blk_create_buf_file_callback, 4022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .remove_buf_file = blk_remove_buf_file_callback, 4032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe}; 4042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4059908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefanstatic void blk_trace_setup_lba(struct blk_trace *bt, 4069908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan struct block_device *bdev) 4079908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan{ 4089908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan struct hd_struct *part = NULL; 4099908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 4109908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan if (bdev) 4119908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan part = bdev->bd_part; 4129908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 4139908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan if (part) { 4149908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->start_lba = part->start_sect; 4159908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->end_lba = part->start_sect + part->nr_sects; 4169908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan } else { 4179908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->start_lba = 0; 4189908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->end_lba = -1ULL; 4199908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan } 4209908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan} 4219908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 4222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 4232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Setup everything required to start tracing 4242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 4256da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 426d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du struct block_device *bdev, 427d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du struct blk_user_trace_setup *buts) 4282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 4292056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *old_bt, *bt = NULL; 4302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct dentry *dir = NULL; 4312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret, i; 4322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 433171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (!buts->buf_size || !buts->buf_nr) 4342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 4352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4360497b345e7d067109e0dd9bf9f4978a6847ee13bJens Axboe strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); 4370497b345e7d067109e0dd9bf9f4978a6847ee13bJens Axboe buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; 4382056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 4402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * some device names have larger paths - convert the slashes 4412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * to underscores for this to work as expected 4422056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 443171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann for (i = 0; i < strlen(buts->name); i++) 444171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (buts->name[i] == '/') 445171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann buts->name[i] = '_'; 4462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4472056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = kzalloc(sizeof(*bt), GFP_KERNEL); 4482056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt) 449ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan return -ENOMEM; 4502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 451ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan ret = -ENOMEM; 4522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->sequence = alloc_percpu(unsigned long); 4532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->sequence) 4542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 456f0ef03985130287c6c84ebe69416cf790e6cc00eIngo Molnar bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 45764565911cdb57c2f512a9715b985b5617402cc67Jens Axboe if (!bt->msg_data) 45864565911cdb57c2f512a9715b985b5617402cc67Jens Axboe goto err; 45964565911cdb57c2f512a9715b985b5617402cc67Jens Axboe 4602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOENT; 461f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 462b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_lock(&blk_tree_mutex); 463f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe if (!blk_tree_root) { 464f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe blk_tree_root = debugfs_create_dir("block", NULL); 465b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan if (!blk_tree_root) { 466b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_unlock(&blk_tree_mutex); 4671a17662ea033674a58bad3603531b0b5d42572f6Li Zefan goto err; 468b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan } 469f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe } 470b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_unlock(&blk_tree_mutex); 471f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 472f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe dir = debugfs_create_dir(buts->name, blk_tree_root); 473f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 4742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!dir) 4752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->dir = dir; 4786da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt bt->dev = dev; 4792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe atomic_set(&bt->dropped, 0); 4802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EIO; 482939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, 483939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo &blk_dropped_fops); 4842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->dropped_file) 4852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 48702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); 48802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (!bt->msg_file) 48902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle goto err; 49002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 491171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->rchan = relay_open("trace", dir, buts->buf_size, 492171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann buts->buf_nr, &blk_relay_callbacks, bt); 4932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->rchan) 4942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 496171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->act_mask = buts->act_mask; 4972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->act_mask) 4982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->act_mask = (u16) -1; 4992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5009908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan blk_trace_setup_lba(bt, bdev); 5012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 502d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du /* overwrite with user settings */ 503d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (buts->start_lba) 504d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du bt->start_lba = buts->start_lba; 505d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (buts->end_lba) 506d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du bt->end_lba = buts->end_lba; 507d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du 508171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->pid = buts->pid; 5092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_setup; 5102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EBUSY; 5122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe old_bt = xchg(&q->blk_trace, bt); 5132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (old_bt) { 5142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe (void) xchg(&q->blk_trace, old_bt); 5152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 5162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 51817ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 519cbe28296eb1ac441b35cf45804d0ae808add7dd1Li Zefan blk_register_tracepoints(); 520cbe28296eb1ac441b35cf45804d0ae808add7dd1Li Zefan 5212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 5222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboeerr: 523ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 5242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 5252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 526171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 5276da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 528d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du struct block_device *bdev, 5296da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt char __user *arg) 530171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann{ 531171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann struct blk_user_trace_setup buts; 532171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann int ret; 533171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 534171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann ret = copy_from_user(&buts, arg, sizeof(buts)); 535171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (ret) 536171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return -EFAULT; 537171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 538d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 539171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (ret) 540171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return ret; 541171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 5429a8c28c8311e30ba97499447d5a11662f5aea094Dmitry Monakhov if (copy_to_user(arg, &buts, sizeof(buts))) { 5439a8c28c8311e30ba97499447d5a11662f5aea094Dmitry Monakhov blk_trace_remove(q); 544171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return -EFAULT; 5459a8c28c8311e30ba97499447d5a11662f5aea094Dmitry Monakhov } 546171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return 0; 547171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann} 5486da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_setup); 5492056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 55062c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 55162c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmannstatic int compat_blk_trace_setup(struct request_queue *q, char *name, 55262c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann dev_t dev, struct block_device *bdev, 55362c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann char __user *arg) 55462c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann{ 55562c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann struct blk_user_trace_setup buts; 55662c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann struct compat_blk_user_trace_setup cbuts; 55762c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann int ret; 55862c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 55962c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann if (copy_from_user(&cbuts, arg, sizeof(cbuts))) 56062c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann return -EFAULT; 56162c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 56262c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann buts = (struct blk_user_trace_setup) { 56362c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .act_mask = cbuts.act_mask, 56462c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .buf_size = cbuts.buf_size, 56562c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .buf_nr = cbuts.buf_nr, 56662c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .start_lba = cbuts.start_lba, 56762c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .end_lba = cbuts.end_lba, 56862c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .pid = cbuts.pid, 56962c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann }; 57062c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann memcpy(&buts.name, &cbuts.name, 32); 57162c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 57262c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 57362c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann if (ret) 57462c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann return ret; 57562c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 57662c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann if (copy_to_user(arg, &buts.name, 32)) { 57762c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann blk_trace_remove(q); 57862c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann return -EFAULT; 57962c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann } 58062c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 58162c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann return 0; 58262c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann} 58362c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann#endif 58462c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 5856da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_startstop(struct request_queue *q, int start) 5862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 5872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret; 588939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 5892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 590939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo if (bt == NULL) 5912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 5922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 5942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * For starting a trace, we can transition from a setup or stopped 5952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * trace. For stopping a trace, the state must be running 5962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 5972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EINVAL; 5982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (start) { 5992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_setup || 6002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state == Blktrace_stopped) { 6012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe blktrace_seq++; 6022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe smp_mb(); 6032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_running; 604be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 605be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch trace_note_time(bt); 6062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = 0; 6072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 6082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } else { 6092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_running) { 6102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_stopped; 6112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe relay_flush(bt->rchan); 6122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = 0; 6132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 6142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 6152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 6172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6186da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_startstop); 6192056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6202056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/** 6212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_trace_ioctl: - handle the ioctls associated with tracing 6222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @bdev: the block device 623ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt * @cmd: the ioctl cmd 6242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @arg: the argument data, if any 6252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 6262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe **/ 6272056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboeint blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) 6282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 629165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboe struct request_queue *q; 6302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret, start = 0; 6316da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt char b[BDEVNAME_SIZE]; 6322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe q = bdev_get_queue(bdev); 6342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!q) 6352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -ENXIO; 6362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe mutex_lock(&bdev->bd_mutex); 6382056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe switch (cmd) { 6402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESETUP: 641f36f21ecca9ee688301174e5f2e0827827a7a7ffJean Delvare bdevname(bdev, b); 642d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 6432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 64462c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 64562c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann case BLKTRACESETUP32: 64662c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann bdevname(bdev, b); 64762c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 64862c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann break; 64962c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann#endif 6502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESTART: 6512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe start = 1; 6522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESTOP: 6532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = blk_trace_startstop(q, start); 6542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 6552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACETEARDOWN: 6562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = blk_trace_remove(q); 6572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 6582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe default: 6592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOTTY; 6602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 6612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 6622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe mutex_unlock(&bdev->bd_mutex); 6642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 6652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/** 6682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_trace_shutdown: - stop and cleanup trace structures 6692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @q: the request queue associated with the device 6702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 6712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe **/ 672165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboevoid blk_trace_shutdown(struct request_queue *q) 6732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 6746c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan if (q->blk_trace) { 6756c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan blk_trace_startstop(q, 0); 6766c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan blk_trace_remove(q); 6776c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan } 6782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/* 6815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blktrace probes 6825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo */ 6835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 6855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_rq - Add a trace for a request oriented action 6865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 6875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @rq: the source request 6885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @what: the action 6895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 6915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Records an action against a request. Will log the bio offset + size. 6925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 6945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq(struct request_queue *q, struct request *rq, 695805f6b5e1cbfedfb9b3d354013e7f4b13a79270fTao Ma u32 what) 6965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 6985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 7005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 7015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 70233659ebbae262228eef4e0fe990f393d1f0ed941Christoph Hellwig if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 7035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo what |= BLK_TC_ACT(BLK_TC_PC); 704805f6b5e1cbfedfb9b3d354013e7f4b13a79270fTao Ma __blk_add_trace(bt, 0, blk_rq_bytes(rq), rq->cmd_flags, 7052e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo what, rq->errors, rq->cmd_len, rq->cmd); 7065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } else { 7075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo what |= BLK_TC_ACT(BLK_TC_FS); 708805f6b5e1cbfedfb9b3d354013e7f4b13a79270fTao Ma __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 709805f6b5e1cbfedfb9b3d354013e7f4b13a79270fTao Ma rq->cmd_flags, what, rq->errors, 0, NULL); 7105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 71338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_abort(void *ignore, 71438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct request *rq) 7155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_ABORT); 7175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 71938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_insert(void *ignore, 72038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct request *rq) 7215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_INSERT); 7235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 72538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_issue(void *ignore, 72638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct request *rq) 7275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_ISSUE); 7295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 73138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_requeue(void *ignore, 73238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 733939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct request *rq) 7345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_REQUEUE); 7365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 73838516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_complete(void *ignore, 73938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 740939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct request *rq) 7415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_COMPLETE); 7435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 7465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_bio - Add a trace for a bio oriented action 7475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 7485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @bio: the source bio 7495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @what: the action 750797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe * @error: error, if any 7515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 7525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 7535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Records an action against a bio. Will log the bio offset + size. 7545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 7555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 7565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio(struct request_queue *q, struct bio *bio, 757797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe u32 what, int error) 7585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 7625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 7635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 764797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe if (!error && !bio_flagged(bio, BIO_UPTODATE)) 765797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe error = EIO; 766797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe 7675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, 768797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe error, 0, NULL); 7695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 77138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_bio_bounce(void *ignore, 77238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct bio *bio) 7735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 774797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0); 7755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 77738516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_bio_complete(void *ignore, 77823036f1a340beec19cc451ba9719526c4ffb3a57Mathieu Desnoyers struct request_queue *q, struct bio *bio, 77923036f1a340beec19cc451ba9719526c4ffb3a57Mathieu Desnoyers int error) 7805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 781797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error); 7825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 78438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_bio_backmerge(void *ignore, 78538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 786939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio) 7875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 788797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0); 7895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 79138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_bio_frontmerge(void *ignore, 79238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 793939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio) 7945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 795797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0); 7965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 79838516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_bio_queue(void *ignore, 79938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct bio *bio) 8005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 801797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0); 8025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 80438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_getrq(void *ignore, 80538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 806939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio, int rw) 8075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bio) 809797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0); 8105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else { 8115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 8145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL); 8155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 81938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_sleeprq(void *ignore, 82038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 821939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio, int rw) 8225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bio) 824797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0); 8255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else { 8265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 829939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ, 830939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo 0, 0, NULL); 8315f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8325f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 83438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_plug(void *ignore, struct request_queue *q) 8355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 8395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL); 8405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 84249cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboestatic void blk_add_trace_unplug(void *ignore, struct request_queue *q, 84349cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe unsigned int depth, bool explicit) 8445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 84894b5eb28b41cc79d9713696e0005ae167b5afd1bJens Axboe __be64 rpdu = cpu_to_be64(depth); 84949cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe u32 what; 8505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 85149cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe if (explicit) 85249cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe what = BLK_TA_UNPLUG_IO; 85349cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe else 85449cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe what = BLK_TA_UNPLUG_TIMER; 85549cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe 85649cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe __blk_add_trace(bt, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu); 8575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 86038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_split(void *ignore, 86138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct bio *bio, 8625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu) 8635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 8675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 8685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 8705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE), 8715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 8725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 876d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzer * blk_add_trace_bio_remap - Add a trace for a bio-remap operation 877546cf44a1b507c1cbb5cf42bbe6169780567f36fRandy Dunlap * @ignore: trace callback data parameter (not used) 8785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 8795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @bio: the source bio 8805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @dev: target device 881a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle * @from: source sector 8825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 8845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Device mapper or raid target sometimes need to split a bio because 8855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * it spans a stripe (or similar). Add a trace for that action. 8865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 888d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzerstatic void blk_add_trace_bio_remap(void *ignore, 889d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzer struct request_queue *q, struct bio *bio, 890d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzer dev_t dev, sector_t from) 8915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_io_trace_remap r; 8945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 8965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 8975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 898a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r.device_from = cpu_to_be32(dev); 899a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev); 900a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r.sector_from = cpu_to_be64(from); 9015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 90222a7c31a9659deaddafbbcec6562d44141e84474Alan D. Brunelle __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 90322a7c31a9659deaddafbbcec6562d44141e84474Alan D. Brunelle BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), 90422a7c31a9659deaddafbbcec6562d44141e84474Alan D. Brunelle sizeof(r), &r); 9055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 9065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 908b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * blk_add_trace_rq_remap - Add a trace for a request-remap operation 909546cf44a1b507c1cbb5cf42bbe6169780567f36fRandy Dunlap * @ignore: trace callback data parameter (not used) 910b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @q: queue the io is for 911b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @rq: the source request 912b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @dev: target device 913b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @from: source sector 914b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * 915b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * Description: 916b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * Device mapper remaps request to other devices. 917b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * Add a trace for that action. 918b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * 919b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura **/ 92038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_remap(void *ignore, 92138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 922b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura struct request *rq, dev_t dev, 923b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura sector_t from) 924b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura{ 925b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura struct blk_trace *bt = q->blk_trace; 926b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura struct blk_io_trace_remap r; 927b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 928b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura if (likely(!bt)) 929b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura return; 930b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 931b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura r.device_from = cpu_to_be32(dev); 932b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); 933b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura r.sector_from = cpu_to_be64(from); 934b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 935b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 936b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura rq_data_dir(rq), BLK_TA_REMAP, !!rq->errors, 937b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura sizeof(r), &r); 938b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura} 939b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 940b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura/** 9415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_driver_data - Add binary message with driver-specific data 9425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 9435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @rq: io request 9445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @data: driver-specific data 9455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @len: length of driver-specific data 9465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 9475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 9485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Some drivers might want to write driver-specific data per request. 9495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 9505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 9515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melovoid blk_add_driver_data(struct request_queue *q, 9525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct request *rq, 9535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo void *data, size_t len) 9545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 9555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 9565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 9585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 9595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 96033659ebbae262228eef4e0fe990f393d1f0ed941Christoph Hellwig if (rq->cmd_type == REQ_TYPE_BLOCK_PC) 9612e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 9622e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else 9642e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 9652e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 9675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(blk_add_driver_data); 9685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9693c289ba7c320560ee74979a8895141c829046a2dLi Zefanstatic void blk_register_tracepoints(void) 9705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 9715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo int ret; 9725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 97338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); 9745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 97538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); 9765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 97738516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); 9785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 97938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); 9805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 98138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); 9825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 98338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); 9845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 98538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); 9865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 98738516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); 9885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 98938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); 9905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 99138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); 9925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 99338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_getrq(blk_add_trace_getrq, NULL); 9945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 99538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); 9965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 99738516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_plug(blk_add_trace_plug, NULL); 9985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 99949cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe ret = register_trace_block_unplug(blk_add_trace_unplug, NULL); 10005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 100138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_split(blk_add_trace_split, NULL); 10025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 1003d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzer ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); 10045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 100538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); 1006b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura WARN_ON(ret); 10075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 10085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 10095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_unregister_tracepoints(void) 10105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 101138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); 1012d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzer unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); 101338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_split(blk_add_trace_split, NULL); 101449cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe unregister_trace_block_unplug(blk_add_trace_unplug, NULL); 101538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_plug(blk_add_trace_plug, NULL); 101638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); 101738516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_getrq(blk_add_trace_getrq, NULL); 101838516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); 101938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); 102038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); 102138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); 102238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); 102338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); 102438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); 102538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); 102638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); 102738516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); 10285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 10295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo tracepoint_synchronize_unregister(); 10305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 1031c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1032c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1033c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * struct blk_io_tracer formatting routines 1034c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1035c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1036c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void fill_rwbs(char *rwbs, const struct blk_io_trace *t) 1037c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1038157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo int i = 0; 103965796348e09880e12b97267d39b8857c758440a6Li Zefan int tc = t->action >> BLK_TC_SHIFT; 1040157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 104118cea4591a98817697017bcb056a848bae1205dfLi Zefan if (t->action == BLK_TN_MESSAGE) { 104218cea4591a98817697017bcb056a848bae1205dfLi Zefan rwbs[i++] = 'N'; 104318cea4591a98817697017bcb056a848bae1205dfLi Zefan goto out; 104418cea4591a98817697017bcb056a848bae1205dfLi Zefan } 104518cea4591a98817697017bcb056a848bae1205dfLi Zefan 1046c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim if (tc & BLK_TC_FLUSH) 1047c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim rwbs[i++] = 'F'; 1048c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim 104965796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_DISCARD) 1050157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'D'; 105165796348e09880e12b97267d39b8857c758440a6Li Zefan else if (tc & BLK_TC_WRITE) 1052157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'W'; 1053157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else if (t->bytes) 1054157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'R'; 1055157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else 1056157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'N'; 1057157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 1058c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim if (tc & BLK_TC_FUA) 1059c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim rwbs[i++] = 'F'; 106065796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_AHEAD) 1061157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'A'; 106265796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_SYNC) 1063157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'S'; 106465796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_META) 1065157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'M'; 106618cea4591a98817697017bcb056a848bae1205dfLi Zefanout: 1067157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i] = '\0'; 1068c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1069c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1070c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline 1071c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloconst struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) 1072c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1073c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return (const struct blk_io_trace *)ent; 1074c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1075c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1076c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline const void *pdu_start(const struct trace_entry *ent) 1077c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1078c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent) + 1; 1079c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1080c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 108166de7792c02693b49671afe58c771fde3b092fc7Li Zefanstatic inline u32 t_action(const struct trace_entry *ent) 108266de7792c02693b49671afe58c771fde3b092fc7Li Zefan{ 108366de7792c02693b49671afe58c771fde3b092fc7Li Zefan return te_blk_io_trace(ent)->action; 108466de7792c02693b49671afe58c771fde3b092fc7Li Zefan} 108566de7792c02693b49671afe58c771fde3b092fc7Li Zefan 108666de7792c02693b49671afe58c771fde3b092fc7Li Zefanstatic inline u32 t_bytes(const struct trace_entry *ent) 108766de7792c02693b49671afe58c771fde3b092fc7Li Zefan{ 108866de7792c02693b49671afe58c771fde3b092fc7Li Zefan return te_blk_io_trace(ent)->bytes; 108966de7792c02693b49671afe58c771fde3b092fc7Li Zefan} 109066de7792c02693b49671afe58c771fde3b092fc7Li Zefan 1091c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline u32 t_sec(const struct trace_entry *ent) 1092c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1093c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->bytes >> 9; 1094c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1095c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1096c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline unsigned long long t_sector(const struct trace_entry *ent) 1097c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1098c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->sector; 1099c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1100c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1101c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline __u16 t_error(const struct trace_entry *ent) 1102c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1103e0dc81bec0927fa0c8aabc521793161909eef7a5Li Zefan return te_blk_io_trace(ent)->error; 1104c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1105c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1106c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic __u64 get_pdu_int(const struct trace_entry *ent) 1107c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1108c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const __u64 *val = pdu_start(ent); 1109c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return be64_to_cpu(*val); 1110c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1111c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1112c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void get_pdu_remap(const struct trace_entry *ent, 1113c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_io_trace_remap *r) 1114c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1115c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const struct blk_io_trace_remap *__r = pdu_start(ent); 1116a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle __u64 sector_from = __r->sector_from; 1117c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1118c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo r->device_from = be32_to_cpu(__r->device_from); 1119a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r->device_to = be32_to_cpu(__r->device_to); 1120a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r->sector_from = be64_to_cpu(sector_from); 1121c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1122c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1123b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefantypedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act); 1124b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 1125b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic int blk_log_action_classic(struct trace_iterator *iter, const char *act) 1126c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1127c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim char rwbs[RWBS_LEN]; 112835ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan unsigned long long ts = iter->ts; 112935ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); 1130c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unsigned secs = (unsigned long)ts; 1131b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1132c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1133c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo fill_rwbs(rwbs, t); 1134c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1135c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(&iter->seq, 113635ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", 1137c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo MAJOR(t->device), MINOR(t->device), iter->cpu, 1138b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan secs, nsec_rem, iter->ent->pid, act, rwbs); 1139c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1140c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1141b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic int blk_log_action(struct trace_iterator *iter, const char *act) 1142c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1143c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim char rwbs[RWBS_LEN]; 1144b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1145b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 1146c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo fill_rwbs(rwbs, t); 1147b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", 1148c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo MAJOR(t->device), MINOR(t->device), act, rwbs); 1149c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1150c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 115166de7792c02693b49671afe58c771fde3b092fc7Li Zefanstatic int blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent) 115266de7792c02693b49671afe58c771fde3b092fc7Li Zefan{ 1153049862579333cc6cd9e6edfd6987cd0addfd8c59Li Zefan const unsigned char *pdu_buf; 115466de7792c02693b49671afe58c771fde3b092fc7Li Zefan int pdu_len; 115566de7792c02693b49671afe58c771fde3b092fc7Li Zefan int i, end, ret; 115666de7792c02693b49671afe58c771fde3b092fc7Li Zefan 115766de7792c02693b49671afe58c771fde3b092fc7Li Zefan pdu_buf = pdu_start(ent); 115866de7792c02693b49671afe58c771fde3b092fc7Li Zefan pdu_len = te_blk_io_trace(ent)->pdu_len; 115966de7792c02693b49671afe58c771fde3b092fc7Li Zefan 116066de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!pdu_len) 116166de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 1; 116266de7792c02693b49671afe58c771fde3b092fc7Li Zefan 116366de7792c02693b49671afe58c771fde3b092fc7Li Zefan /* find the last zero that needs to be printed */ 116466de7792c02693b49671afe58c771fde3b092fc7Li Zefan for (end = pdu_len - 1; end >= 0; end--) 116566de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (pdu_buf[end]) 116666de7792c02693b49671afe58c771fde3b092fc7Li Zefan break; 116766de7792c02693b49671afe58c771fde3b092fc7Li Zefan end++; 116866de7792c02693b49671afe58c771fde3b092fc7Li Zefan 116966de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!trace_seq_putc(s, '(')) 117066de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 117166de7792c02693b49671afe58c771fde3b092fc7Li Zefan 117266de7792c02693b49671afe58c771fde3b092fc7Li Zefan for (i = 0; i < pdu_len; i++) { 117366de7792c02693b49671afe58c771fde3b092fc7Li Zefan 117466de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = trace_seq_printf(s, "%s%02x", 117566de7792c02693b49671afe58c771fde3b092fc7Li Zefan i == 0 ? "" : " ", pdu_buf[i]); 117666de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!ret) 117766de7792c02693b49671afe58c771fde3b092fc7Li Zefan return ret; 117866de7792c02693b49671afe58c771fde3b092fc7Li Zefan 117966de7792c02693b49671afe58c771fde3b092fc7Li Zefan /* 118066de7792c02693b49671afe58c771fde3b092fc7Li Zefan * stop when the rest is just zeroes and indicate so 118166de7792c02693b49671afe58c771fde3b092fc7Li Zefan * with a ".." appended 118266de7792c02693b49671afe58c771fde3b092fc7Li Zefan */ 118366de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (i == end && end != pdu_len - 1) 118466de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_puts(s, " ..) "); 118566de7792c02693b49671afe58c771fde3b092fc7Li Zefan } 118666de7792c02693b49671afe58c771fde3b092fc7Li Zefan 118766de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_puts(s, ") "); 118866de7792c02693b49671afe58c771fde3b092fc7Li Zefan} 118966de7792c02693b49671afe58c771fde3b092fc7Li Zefan 1190c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent) 1191c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 11924ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 11934ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 11944ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 1195c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 119666de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 119766de7792c02693b49671afe58c771fde3b092fc7Li Zefan int ret; 119866de7792c02693b49671afe58c771fde3b092fc7Li Zefan 119966de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = trace_seq_printf(s, "%u ", t_bytes(ent)); 120066de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!ret) 120166de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 120266de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = blk_log_dump_pdu(s, ent); 120366de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!ret) 120466de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 120566de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "[%s]\n", cmd); 120666de7792c02693b49671afe58c771fde3b092fc7Li Zefan } else { 120766de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_sec(ent)) 120866de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "%llu + %u [%s]\n", 120966de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sector(ent), t_sec(ent), cmd); 121066de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "[%s]\n", cmd); 121166de7792c02693b49671afe58c771fde3b092fc7Li Zefan } 1212c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1213c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1214157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melostatic int blk_log_with_error(struct trace_seq *s, 1215157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo const struct trace_entry *ent) 1216c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 121766de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 121866de7792c02693b49671afe58c771fde3b092fc7Li Zefan int ret; 121966de7792c02693b49671afe58c771fde3b092fc7Li Zefan 122066de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = blk_log_dump_pdu(s, ent); 122166de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (ret) 122266de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "[%d]\n", t_error(ent)); 122366de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 122466de7792c02693b49671afe58c771fde3b092fc7Li Zefan } else { 122566de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_sec(ent)) 122666de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "%llu + %u [%d]\n", 122766de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sector(ent), 122866de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sec(ent), t_error(ent)); 122966de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "%llu [%d]\n", 123066de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sector(ent), t_error(ent)); 123166de7792c02693b49671afe58c771fde3b092fc7Li Zefan } 1232c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1233c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1234c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent) 1235c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1236a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle struct blk_io_trace_remap r = { .device_from = 0, }; 1237c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1238c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo get_pdu_remap(ent, &r); 1239c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", 1240a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle t_sector(ent), t_sec(ent), 1241a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle MAJOR(r.device_from), MINOR(r.device_from), 1242a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle (unsigned long long)r.sector_from); 1243c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1244c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1245c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent) 1246c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 12474ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 12484ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12494ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12504ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12514ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt return trace_seq_printf(s, "[%s]\n", cmd); 1252c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1253c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1254c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent) 1255c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 12564ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 12574ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12584ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12594ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12604ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent)); 1261c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1262c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1263c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_split(struct trace_seq *s, const struct trace_entry *ent) 1264c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 12654ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 12664ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12674ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12684ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 1269c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), 12704ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt get_pdu_int(ent), cmd); 1271c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1272c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 127318cea4591a98817697017bcb056a848bae1205dfLi Zefanstatic int blk_log_msg(struct trace_seq *s, const struct trace_entry *ent) 127418cea4591a98817697017bcb056a848bae1205dfLi Zefan{ 127518cea4591a98817697017bcb056a848bae1205dfLi Zefan int ret; 127618cea4591a98817697017bcb056a848bae1205dfLi Zefan const struct blk_io_trace *t = te_blk_io_trace(ent); 127718cea4591a98817697017bcb056a848bae1205dfLi Zefan 127818cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = trace_seq_putmem(s, t + 1, t->pdu_len); 127918cea4591a98817697017bcb056a848bae1205dfLi Zefan if (ret) 128018cea4591a98817697017bcb056a848bae1205dfLi Zefan return trace_seq_putc(s, '\n'); 128118cea4591a98817697017bcb056a848bae1205dfLi Zefan return ret; 128218cea4591a98817697017bcb056a848bae1205dfLi Zefan} 128318cea4591a98817697017bcb056a848bae1205dfLi Zefan 1284c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1285c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * struct tracer operations 1286c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1287c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1288c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_print_header(struct seq_file *m) 1289c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1290c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 1291c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 1292c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" 1293c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo "# | | | | | |\n"); 1294c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1295c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1296c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_start(struct trace_array *tr) 1297c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1298ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_tracer_enabled = true; 1299c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1300c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1301c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_tracer_init(struct trace_array *tr) 1302c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1303c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tr = tr; 1304c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_start(tr); 1305c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1306c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1307c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1308c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_stop(struct trace_array *tr) 1309c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1310ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_tracer_enabled = false; 1311c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1312c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1313c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_reset(struct trace_array *tr) 1314c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1315c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_stop(tr); 1316c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1317c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1318e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefanstatic const struct { 1319c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *act[2]; 1320ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt int (*print)(struct trace_seq *s, const struct trace_entry *ent); 1321e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefan} what2act[] = { 1322ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, 1323c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, 1324c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, 1325c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, 1326c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, 1327c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, 1328c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, 1329c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, 1330c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, 1331c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, 133249cac01e1fa74174d72adb0e872504a7fefd7c01Jens Axboe [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, 1333c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, 1334c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, 1335c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, 1336c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, 1337c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1338c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1339b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic enum print_line_t print_one_line(struct trace_iterator *iter, 1340b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan bool classic) 1341c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 13422c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo struct trace_seq *s = &iter->seq; 1343b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t; 1344b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan u16 what; 1345c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int ret; 1346b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan bool long_act; 1347b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan blk_log_action_t *log_action; 1348c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1349b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan t = te_blk_io_trace(iter->ent); 1350b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan what = t->action & ((1 << BLK_TC_SHIFT) - 1); 1351b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan long_act = !!(trace_flags & TRACE_ITER_VERBOSE); 1352b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan log_action = classic ? &blk_log_action_classic : &blk_log_action; 135308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 135418cea4591a98817697017bcb056a848bae1205dfLi Zefan if (t->action == BLK_TN_MESSAGE) { 135518cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = log_action(iter, long_act ? "message" : "m"); 135618cea4591a98817697017bcb056a848bae1205dfLi Zefan if (ret) 135718cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = blk_log_msg(s, iter->ent); 135818cea4591a98817697017bcb056a848bae1205dfLi Zefan goto out; 135918cea4591a98817697017bcb056a848bae1205dfLi Zefan } 136018cea4591a98817697017bcb056a848bae1205dfLi Zefan 1361eb08f8eb0673d9c1e62b69ad1b41593e73c40467Li Zefan if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) 1362b78825d608f30a47e3154ab6872a03f0de0c9d45Li Zefan ret = trace_seq_printf(s, "Unknown action %x\n", what); 1363c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else { 1364b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan ret = log_action(iter, what2act[what].act[long_act]); 1365c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret) 13662c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo ret = what2act[what].print(s, iter->ent); 1367c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 136818cea4591a98817697017bcb056a848bae1205dfLi Zefanout: 1369c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 1370c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1371c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1372b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic enum print_line_t blk_trace_event_print(struct trace_iterator *iter, 1373a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt int flags, struct trace_event *event) 1374b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan{ 1375b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return print_one_line(iter, false); 1376b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan} 1377b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 137808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melostatic int blk_trace_synthesize_old_trace(struct trace_iterator *iter) 137908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo{ 138008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct trace_seq *s = &iter->seq; 138108a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; 138208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo const int offset = offsetof(struct blk_io_trace, sector); 138308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct blk_io_trace old = { 138408a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, 13856c051ce0307526adec32a847f0daa1af2124f0a9Li Zefan .time = iter->ts, 138608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo }; 138708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 138808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo if (!trace_seq_putmem(s, &old, offset)) 138908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return 0; 139008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return trace_seq_putmem(s, &t->sector, 139108a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo sizeof(old) - offset + t->pdu_len); 139208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo} 139308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1394ae7462b4f1fe1f36b5d562dbd5202a2eba01f072Arnaldo Carvalho de Melostatic enum print_line_t 1395a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedtblk_trace_event_print_binary(struct trace_iterator *iter, int flags, 1396a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt struct trace_event *event) 139708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo{ 139808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return blk_trace_synthesize_old_trace(iter) ? 139908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 140008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo} 140108a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1402c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) 1403c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1404c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 1405c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return TRACE_TYPE_UNHANDLED; 1406c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1407b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return print_one_line(iter, true); 1408c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1409c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1410f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefanstatic int blk_tracer_set_flag(u32 old_flags, u32 bit, int set) 1411f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan{ 1412f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan /* don't output context-info for blk_classic output */ 1413f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan if (bit == TRACE_BLK_OPT_CLASSIC) { 1414f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan if (set) 1415f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan trace_flags &= ~TRACE_ITER_CONTEXT_INFO; 1416f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan else 1417f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan trace_flags |= TRACE_ITER_CONTEXT_INFO; 1418f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan } 1419f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan return 0; 1420f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan} 1421f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan 1422c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer blk_tracer __read_mostly = { 1423c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .name = "blk", 1424c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .init = blk_tracer_init, 1425c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .reset = blk_tracer_reset, 1426c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .start = blk_tracer_start, 1427c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .stop = blk_tracer_stop, 1428c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .print_header = blk_tracer_print_header, 1429c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .print_line = blk_tracer_print_line, 1430c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .flags = &blk_tracer_flags, 1431f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan .set_flag = blk_tracer_set_flag, 1432c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1433c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1434a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedtstatic struct trace_event_functions trace_blk_event_funcs = { 1435c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .trace = blk_trace_event_print, 143608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .binary = blk_trace_event_print_binary, 1437c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1438c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1439a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedtstatic struct trace_event trace_blk_event = { 1440a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt .type = TRACE_BLK, 1441a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt .funcs = &trace_blk_event_funcs, 1442a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt}; 1443a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt 1444c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int __init init_blk_tracer(void) 1445c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1446c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!register_ftrace_event(&trace_blk_event)) { 1447c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo pr_warning("Warning: could not register block events\n"); 1448c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 1; 1449c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1450c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1451c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (register_tracer(&blk_tracer) != 0) { 1452c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo pr_warning("Warning: could not register the block tracer\n"); 1453c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unregister_ftrace_event(&trace_blk_event); 1454c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 1; 1455c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1456c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1457c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1458c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1459c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1460c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melodevice_initcall(init_blk_tracer); 1461c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1462c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_trace_remove_queue(struct request_queue *q) 1463c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1464c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_trace *bt; 1465c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1466c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt = xchg(&q->blk_trace, NULL); 1467c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bt == NULL) 1468c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return -EINVAL; 1469c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 147017ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_dec_and_test(&blk_probes_ref)) 147117ba97e347bec9bbc47a0877c7a098708982129dLi Zefan blk_unregister_tracepoints(); 147217ba97e347bec9bbc47a0877c7a098708982129dLi Zefan 1473ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 1474c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1475c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1476c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1477c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1478c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * Setup everything required to start tracing 1479c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 14809908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefanstatic int blk_trace_setup_queue(struct request_queue *q, 14819908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan struct block_device *bdev) 1482c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1483c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_trace *old_bt, *bt = NULL; 148418cea4591a98817697017bcb056a848bae1205dfLi Zefan int ret = -ENOMEM; 1485c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1486c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt = kzalloc(sizeof(*bt), GFP_KERNEL); 1487c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!bt) 148815152e448b693fa41de40f1e40ffbe717a3aab88Li Zefan return -ENOMEM; 1489c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 149018cea4591a98817697017bcb056a848bae1205dfLi Zefan bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 149118cea4591a98817697017bcb056a848bae1205dfLi Zefan if (!bt->msg_data) 149218cea4591a98817697017bcb056a848bae1205dfLi Zefan goto free_bt; 149318cea4591a98817697017bcb056a848bae1205dfLi Zefan 14949908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->dev = bdev->bd_dev; 1495c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt->act_mask = (u16)-1; 14969908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 14979908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan blk_trace_setup_lba(bt, bdev); 1498c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1499c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo old_bt = xchg(&q->blk_trace, bt); 1500c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (old_bt != NULL) { 1501c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo (void)xchg(&q->blk_trace, old_bt); 150218cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = -EBUSY; 150318cea4591a98817697017bcb056a848bae1205dfLi Zefan goto free_bt; 1504c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 150515152e448b693fa41de40f1e40ffbe717a3aab88Li Zefan 150617ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 150717ba97e347bec9bbc47a0877c7a098708982129dLi Zefan blk_register_tracepoints(); 1508c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 150918cea4591a98817697017bcb056a848bae1205dfLi Zefan 151018cea4591a98817697017bcb056a848bae1205dfLi Zefanfree_bt: 151118cea4591a98817697017bcb056a848bae1205dfLi Zefan blk_trace_free(bt); 151218cea4591a98817697017bcb056a848bae1205dfLi Zefan return ret; 1513c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1514c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1515c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1516c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * sysfs interface to enable and configure tracing 1517c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1518c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1519c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_show(struct device *dev, 1520c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1521c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf); 1522c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_store(struct device *dev, 1523c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1524c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count); 1525c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo#define BLK_TRACE_DEVICE_ATTR(_name) \ 1526c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ 1527c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_attr_show, \ 1528c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_attr_store) 1529c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1530cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanstatic BLK_TRACE_DEVICE_ATTR(enable); 1531c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(act_mask); 1532c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(pid); 1533c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(start_lba); 1534c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(end_lba); 1535c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1536c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct attribute *blk_trace_attrs[] = { 1537c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_enable.attr, 1538c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_act_mask.attr, 1539c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_pid.attr, 1540c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_start_lba.attr, 1541c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_end_lba.attr, 1542c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo NULL 1543c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1544c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1545c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostruct attribute_group blk_trace_attr_group = { 1546c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .name = "trace", 1547c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .attrs = blk_trace_attrs, 1548c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1549c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1550093419971e03362a00f499960557c119982ea09fLi Zefanstatic const struct { 1551093419971e03362a00f499960557c119982ea09fLi Zefan int mask; 1552093419971e03362a00f499960557c119982ea09fLi Zefan const char *str; 1553093419971e03362a00f499960557c119982ea09fLi Zefan} mask_maps[] = { 1554093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_READ, "read" }, 1555093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_WRITE, "write" }, 1556c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim { BLK_TC_FLUSH, "flush" }, 1557093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_SYNC, "sync" }, 1558093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_QUEUE, "queue" }, 1559093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_REQUEUE, "requeue" }, 1560093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_ISSUE, "issue" }, 1561093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_COMPLETE, "complete" }, 1562093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_FS, "fs" }, 1563093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_PC, "pc" }, 1564093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_AHEAD, "ahead" }, 1565093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_META, "meta" }, 1566093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_DISCARD, "discard" }, 1567093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_DRV_DATA, "drv_data" }, 1568c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim { BLK_TC_FUA, "fua" }, 1569093419971e03362a00f499960557c119982ea09fLi Zefan}; 1570093419971e03362a00f499960557c119982ea09fLi Zefan 1571093419971e03362a00f499960557c119982ea09fLi Zefanstatic int blk_trace_str2mask(const char *str) 1572c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1573093419971e03362a00f499960557c119982ea09fLi Zefan int i; 1574c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int mask = 0; 15759eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan char *buf, *s, *token; 1576c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 15779eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan buf = kstrdup(str, GFP_KERNEL); 15789eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan if (buf == NULL) 1579c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return -ENOMEM; 15809eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan s = strstrip(buf); 1581c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1582c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo while (1) { 1583093419971e03362a00f499960557c119982ea09fLi Zefan token = strsep(&s, ","); 1584093419971e03362a00f499960557c119982ea09fLi Zefan if (token == NULL) 1585c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo break; 1586c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1587093419971e03362a00f499960557c119982ea09fLi Zefan if (*token == '\0') 1588093419971e03362a00f499960557c119982ea09fLi Zefan continue; 1589093419971e03362a00f499960557c119982ea09fLi Zefan 1590093419971e03362a00f499960557c119982ea09fLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 1591093419971e03362a00f499960557c119982ea09fLi Zefan if (strcasecmp(token, mask_maps[i].str) == 0) { 1592093419971e03362a00f499960557c119982ea09fLi Zefan mask |= mask_maps[i].mask; 1593093419971e03362a00f499960557c119982ea09fLi Zefan break; 1594093419971e03362a00f499960557c119982ea09fLi Zefan } 1595093419971e03362a00f499960557c119982ea09fLi Zefan } 1596093419971e03362a00f499960557c119982ea09fLi Zefan if (i == ARRAY_SIZE(mask_maps)) { 1597093419971e03362a00f499960557c119982ea09fLi Zefan mask = -EINVAL; 1598093419971e03362a00f499960557c119982ea09fLi Zefan break; 1599093419971e03362a00f499960557c119982ea09fLi Zefan } 1600c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 16019eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan kfree(buf); 1602c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1603c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return mask; 1604c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1605c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1606093419971e03362a00f499960557c119982ea09fLi Zefanstatic ssize_t blk_trace_mask2str(char *buf, int mask) 1607093419971e03362a00f499960557c119982ea09fLi Zefan{ 1608093419971e03362a00f499960557c119982ea09fLi Zefan int i; 1609093419971e03362a00f499960557c119982ea09fLi Zefan char *p = buf; 1610093419971e03362a00f499960557c119982ea09fLi Zefan 1611093419971e03362a00f499960557c119982ea09fLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 1612093419971e03362a00f499960557c119982ea09fLi Zefan if (mask & mask_maps[i].mask) { 1613093419971e03362a00f499960557c119982ea09fLi Zefan p += sprintf(p, "%s%s", 1614093419971e03362a00f499960557c119982ea09fLi Zefan (p == buf) ? "" : ",", mask_maps[i].str); 1615093419971e03362a00f499960557c119982ea09fLi Zefan } 1616093419971e03362a00f499960557c119982ea09fLi Zefan } 1617093419971e03362a00f499960557c119982ea09fLi Zefan *p++ = '\n'; 1618093419971e03362a00f499960557c119982ea09fLi Zefan 1619093419971e03362a00f499960557c119982ea09fLi Zefan return p - buf; 1620093419971e03362a00f499960557c119982ea09fLi Zefan} 1621093419971e03362a00f499960557c119982ea09fLi Zefan 1622b125130b22d67f249beba10b71a254558b5279d0Li Zefanstatic struct request_queue *blk_trace_get_queue(struct block_device *bdev) 1623b125130b22d67f249beba10b71a254558b5279d0Li Zefan{ 1624b125130b22d67f249beba10b71a254558b5279d0Li Zefan if (bdev->bd_disk == NULL) 1625b125130b22d67f249beba10b71a254558b5279d0Li Zefan return NULL; 1626b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1627b125130b22d67f249beba10b71a254558b5279d0Li Zefan return bdev_get_queue(bdev); 1628b125130b22d67f249beba10b71a254558b5279d0Li Zefan} 1629b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1630c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_show(struct device *dev, 1631c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1632c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf) 1633c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1634c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p = dev_to_part(dev); 1635c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1636c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1637c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ssize_t ret = -ENXIO; 1638c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1639c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1640c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 164101b284f9b6d51cc3f3bcf3b49f16d2601d3ca22dArnd Bergmann goto out; 1642c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1643b125130b22d67f249beba10b71a254558b5279d0Li Zefan q = blk_trace_get_queue(bdev); 1644c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1645c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1646b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1647c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1648cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1649cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (attr == &dev_attr_enable) { 1650cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan ret = sprintf(buf, "%u\n", !!q->blk_trace); 1651cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan goto out_unlock_bdev; 1652cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan } 1653cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1654c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q->blk_trace == NULL) 1655c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "disabled\n"); 1656c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_act_mask) 1657093419971e03362a00f499960557c119982ea09fLi Zefan ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); 1658c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_pid) 1659c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%u\n", q->blk_trace->pid); 1660c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_start_lba) 1661c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); 1662c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_end_lba) 1663c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); 1664cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1665cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanout_unlock_bdev: 1666c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1667c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1668c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 166901b284f9b6d51cc3f3bcf3b49f16d2601d3ca22dArnd Bergmannout: 1670c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret; 1671c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1672c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1673c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_store(struct device *dev, 1674c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1675c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count) 1676c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1677c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1678c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1679c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p; 1680c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo u64 value; 1681093419971e03362a00f499960557c119982ea09fLi Zefan ssize_t ret = -EINVAL; 1682c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1683c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (count == 0) 1684c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1685c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1686c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (attr == &dev_attr_act_mask) { 1687c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (sscanf(buf, "%llx", &value) != 1) { 1688c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo /* Assume it is a list of trace category names */ 1689093419971e03362a00f499960557c119982ea09fLi Zefan ret = blk_trace_str2mask(buf); 1690093419971e03362a00f499960557c119982ea09fLi Zefan if (ret < 0) 1691c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1692093419971e03362a00f499960557c119982ea09fLi Zefan value = ret; 1693c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1694c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } else if (sscanf(buf, "%llu", &value) != 1) 1695c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1696c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1697093419971e03362a00f499960557c119982ea09fLi Zefan ret = -ENXIO; 1698093419971e03362a00f499960557c119982ea09fLi Zefan 1699c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo p = dev_to_part(dev); 1700c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1701c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 170201b284f9b6d51cc3f3bcf3b49f16d2601d3ca22dArnd Bergmann goto out; 1703c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1704b125130b22d67f249beba10b71a254558b5279d0Li Zefan q = blk_trace_get_queue(bdev); 1705c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1706c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1707c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1708c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1709cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1710cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (attr == &dev_attr_enable) { 1711cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (value) 17129908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan ret = blk_trace_setup_queue(q, bdev); 1713cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan else 1714cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan ret = blk_trace_remove_queue(q); 1715cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan goto out_unlock_bdev; 1716cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan } 1717cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1718c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = 0; 1719c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q->blk_trace == NULL) 17209908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan ret = blk_trace_setup_queue(q, bdev); 1721c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1722c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret == 0) { 1723c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (attr == &dev_attr_act_mask) 1724c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->act_mask = value; 1725c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_pid) 1726c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->pid = value; 1727c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_start_lba) 1728c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->start_lba = value; 1729c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_end_lba) 1730c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->end_lba = value; 1731c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1732cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1733cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanout_unlock_bdev: 1734c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1735c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1736c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 1737c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout: 1738cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan return ret ? ret : count; 1739c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1740cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 17411d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefanint blk_trace_init_sysfs(struct device *dev) 17421d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan{ 17431d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); 17441d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan} 17451d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan 174648c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelacvoid blk_trace_remove_sysfs(struct device *dev) 174748c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac{ 174848c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac sysfs_remove_group(&dev->kobj, &blk_trace_attr_group); 174948c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac} 175048c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac 175155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#endif /* CONFIG_BLK_DEV_IO_TRACE */ 175255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 175355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#ifdef CONFIG_EVENT_TRACING 175455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 175555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefanvoid blk_dump_cmd(char *buf, struct request *rq) 175655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan{ 175755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int i, end; 175855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int len = rq->cmd_len; 175955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan unsigned char *cmd = rq->cmd; 176055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 176133659ebbae262228eef4e0fe990f393d1f0ed941Christoph Hellwig if (rq->cmd_type != REQ_TYPE_BLOCK_PC) { 176255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan buf[0] = '\0'; 176355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan return; 176455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan } 176555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 176655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan for (end = len - 1; end >= 0; end--) 176755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (cmd[end]) 176855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan break; 176955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan end++; 177055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 177155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan for (i = 0; i < len; i++) { 177255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]); 177355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (i == end && end != len - 1) { 177455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan sprintf(buf, " .."); 177555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan break; 177655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan } 177755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan } 177855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan} 177955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 178055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefanvoid blk_fill_rwbs(char *rwbs, u32 rw, int bytes) 178155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan{ 178255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int i = 0; 178355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 1784c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim if (rw & REQ_FLUSH) 1785c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim rwbs[i++] = 'F'; 1786c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim 178755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (rw & WRITE) 178855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'W'; 17897b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig else if (rw & REQ_DISCARD) 179055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'D'; 179155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan else if (bytes) 179255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'R'; 179355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan else 179455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'N'; 179555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 1796c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim if (rw & REQ_FUA) 1797c09c47caedc9854d59378d6e34c989e51cfdd2b4Namhyung Kim rwbs[i++] = 'F'; 17987b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig if (rw & REQ_RAHEAD) 179955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'A'; 18007b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig if (rw & REQ_SYNC) 180155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'S'; 18027b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig if (rw & REQ_META) 180355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'M'; 18048d57a98ccd0b4489003473979da8f5a1363ba7a3Adrian Hunter if (rw & REQ_SECURE) 18058d57a98ccd0b4489003473979da8f5a1363ba7a3Adrian Hunter rwbs[i++] = 'E'; 180655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 180755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i] = '\0'; 180855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan} 180955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 181055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#endif /* CONFIG_EVENT_TRACING */ 181155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 1812