blktrace.c revision 5a0e3ad6af8660be21ca98a971cd00f331318c05
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> 26405f55712dfe464b3240d7816cc4fe4174831be2Alexey Dobriyan#include <linux/smp_lock.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 14214a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde local_irq_save(flags); 14364565911cdb57c2f512a9715b985b5617402cc67Jens Axboe buf = per_cpu_ptr(bt->msg_data, smp_processor_id()); 1449d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_start(args, fmt); 14564565911cdb57c2f512a9715b985b5617402cc67Jens Axboe n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); 1469d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_end(args); 1479d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 14864565911cdb57c2f512a9715b985b5617402cc67Jens Axboe trace_note(bt, 0, BLK_TN_MESSAGE, buf, n); 14914a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde local_irq_restore(flags); 1509d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle} 1519d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. BrunelleEXPORT_SYMBOL_GPL(__trace_note_message); 1529d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 1532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, 1542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid_t pid) 1552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 1562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) 1572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 158d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (sector && (sector < bt->start_lba || sector > bt->end_lba)) 1592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->pid && pid != bt->pid) 1612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 1642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 1652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 1672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Data direction bit lookup 1682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 169e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefanstatic const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), 170e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefan BLK_TC_ACT(BLK_TC_WRITE) }; 1712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 17235ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse/* The ilog2() calls fall out because they're constant */ 173939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo#define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \ 174939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name)) 1752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 1772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * The worker for the various blk_add_trace*() types. Fills out a 1782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_io_trace structure and places it in a per-cpu subbuffer. 1792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 1805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, 1812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int rw, u32 what, int error, int pdu_len, void *pdu_data) 1822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 1832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct task_struct *tsk = current; 184c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct ring_buffer_event *event = NULL; 185e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt struct ring_buffer *buffer = NULL; 1862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_io_trace *t; 1870a9877514c4fed10a70720293b37213dd172ee3eArnaldo Carvalho de Melo unsigned long flags = 0; 1882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe unsigned long *sequence; 1892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid_t pid; 190c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int cpu, pc = 0; 19118cea4591a98817697017bcb056a848bae1205dfLi Zefan bool blk_tracer = blk_tracer_enabled; 1922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 19318cea4591a98817697017bcb056a848bae1205dfLi Zefan if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) 1942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return; 1952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe what |= ddir_act[rw & WRITE]; 19735ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, BARRIER); 19872c26c9a26ea7f2f3d14f162c2ebb07805f724eaIngo Molnar what |= MASK_TC_BIT(rw, SYNCIO); 19935ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, AHEAD); 20035ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, META); 20135ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, DISCARD); 2022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid = tsk->pid; 204d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (act_log_check(bt, what, sector, pid)) 2052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return; 206c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo cpu = raw_smp_processor_id(); 207c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 20818cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 209c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo tracing_record_cmdline(current); 210c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 211e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt buffer = blk_tr->buffer; 21251a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo pc = preempt_count(); 213e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BLK, 21451a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo sizeof(*t) + pdu_len, 21551a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo 0, pc); 216c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!event) 217c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 21851a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo t = ring_buffer_event_data(event); 219c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto record_it; 220c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 2212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 2232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * A word about the locking here - we disable interrupts to reserve 2242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * some space in the relay per-cpu buffer, to prevent an irq 22514a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde * from coming in and stepping on our toes. 2262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 2272056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe local_irq_save(flags); 2282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2292056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (unlikely(tsk->btrace_seq != blktrace_seq)) 2302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe trace_note_tsk(bt, tsk); 2312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len); 2332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (t) { 2342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe sequence = per_cpu_ptr(bt->sequence, cpu); 2352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 2372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->sequence = ++(*sequence); 2382997c8c4a0b179e8b834a7f30ba4323f2c60ccf4Ingo Molnar t->time = ktime_to_ns(ktime_get()); 239c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melorecord_it: 24008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo /* 241939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * These two are not needed in ftrace as they are in the 242939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * generic trace_entry, filled by tracing_generic_entry_update, 243939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * but for the trace_event->bin() synthesizer benefit we do it 244939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * here too. 245939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo */ 246939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo t->cpu = cpu; 247939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo t->pid = pid; 24808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 2492056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->sector = sector; 2502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->bytes = bytes; 2512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->action = what; 2522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->device = bt->dev; 2532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->error = error; 2542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->pdu_len = pdu_len; 2552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (pdu_len) 2572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe memcpy((void *) t + sizeof(*t), pdu_data, pdu_len); 258c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 25918cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 260e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt trace_buffer_unlock_commit(buffer, event, 0, pc); 261c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 262c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 2632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 2642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe local_irq_restore(flags); 2662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct dentry *blk_tree_root; 26911a57153e3377ffdf8cfca2eda9a99063f66b957Jens Axboestatic DEFINE_MUTEX(blk_tree_mutex); 2702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 271ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefanstatic void blk_trace_free(struct blk_trace *bt) 2722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 27302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle debugfs_remove(bt->msg_file); 2742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(bt->dropped_file); 275f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe relay_close(bt->rchan); 27639cbb602b543e477df71dca84b5b2e36f8bd29fcAlan D. Brunelle debugfs_remove(bt->dir); 2772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe free_percpu(bt->sequence); 27864565911cdb57c2f512a9715b985b5617402cc67Jens Axboe free_percpu(bt->msg_data); 2792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe kfree(bt); 280ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan} 281ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan 282ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefanstatic void blk_trace_cleanup(struct blk_trace *bt) 283ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan{ 284ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 2855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (atomic_dec_and_test(&blk_probes_ref)) 2865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_unregister_tracepoints(); 2872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2896da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_remove(struct request_queue *q) 2902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 2912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt; 2922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = xchg(&q->blk_trace, NULL); 2942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt) 2952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 2962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2975554720482a631702146a959db22fe417740e0a6Li Zefan if (bt->trace_state != Blktrace_running) 2982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe blk_trace_cleanup(bt); 2992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3026da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_remove); 3032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_dropped_open(struct inode *inode, struct file *filp) 3052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3068e18e2941c53416aa219708e7dcad21fb4bd6794Theodore Ts'o filp->private_data = inode->i_private; 3072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic ssize_t blk_dropped_read(struct file *filp, char __user *buffer, 3122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe size_t count, loff_t *ppos) 3132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt = filp->private_data; 3152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe char buf[16]; 3162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); 3182056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3192056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 3202056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3222b8693c0617e972fc0b2fd1ebf8de97e15b656c3Arjan van de Venstatic const struct file_operations blk_dropped_fops = { 3232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .owner = THIS_MODULE, 3242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .open = blk_dropped_open, 3252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .read = blk_dropped_read, 3262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe}; 3272056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 32802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic int blk_msg_open(struct inode *inode, struct file *filp) 32902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle{ 33002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle filp->private_data = inode->i_private; 33102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 33202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return 0; 33302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle} 33402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 33502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic ssize_t blk_msg_write(struct file *filp, const char __user *buffer, 33602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle size_t count, loff_t *ppos) 33702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle{ 33802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle char *msg; 33902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle struct blk_trace *bt; 34002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 3417635b03adf3d7b84da7649b81efa91e6ebf11b85Li Zefan if (count >= BLK_TN_MAX_MSG) 34202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -EINVAL; 34302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 344a4b3ada83d06554d307dd54abdc62b2e5648264aCarl Henrik Lunde msg = kmalloc(count + 1, GFP_KERNEL); 34502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (msg == NULL) 34602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -ENOMEM; 34702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 34802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (copy_from_user(msg, buffer, count)) { 34902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle kfree(msg); 35002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -EFAULT; 35102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle } 35202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 353a4b3ada83d06554d307dd54abdc62b2e5648264aCarl Henrik Lunde msg[count] = '\0'; 35402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle bt = filp->private_data; 35502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle __trace_note_message(bt, "%s", msg); 35602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle kfree(msg); 35702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 35802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return count; 35902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle} 36002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 36102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic const struct file_operations blk_msg_fops = { 36202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .owner = THIS_MODULE, 36302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .open = blk_msg_open, 36402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .write = blk_msg_write, 36502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle}; 36602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 3672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 3682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Keep track of how many times we encountered a full subbuffer, to aid 3692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * the user space app in telling how many lost events there were. 3702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 3712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, 3722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe void *prev_subbuf, size_t prev_padding) 3732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt; 3752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!relay_buf_full(buf)) 3772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 3782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = buf->chan->private_data; 3802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe atomic_inc(&bt->dropped); 3812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_remove_buf_file_callback(struct dentry *dentry) 3852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(dentry); 387f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 3882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct dentry *blk_create_buf_file_callback(const char *filename, 3922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct dentry *parent, 3932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int mode, 3942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct rchan_buf *buf, 3952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int *is_global) 3962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return debugfs_create_file(filename, mode, parent, buf, 3982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe &relay_file_operations); 3992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 4002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct rchan_callbacks blk_relay_callbacks = { 4022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .subbuf_start = blk_subbuf_start_callback, 4032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .create_buf_file = blk_create_buf_file_callback, 4042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .remove_buf_file = blk_remove_buf_file_callback, 4052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe}; 4062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4079908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefanstatic void blk_trace_setup_lba(struct blk_trace *bt, 4089908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan struct block_device *bdev) 4099908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan{ 4109908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan struct hd_struct *part = NULL; 4119908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 4129908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan if (bdev) 4139908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan part = bdev->bd_part; 4149908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 4159908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan if (part) { 4169908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->start_lba = part->start_sect; 4179908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->end_lba = part->start_sect + part->nr_sects; 4189908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan } else { 4199908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->start_lba = 0; 4209908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->end_lba = -1ULL; 4219908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan } 4229908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan} 4239908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 4242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 4252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Setup everything required to start tracing 4262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 4276da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 428d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du struct block_device *bdev, 429d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du struct blk_user_trace_setup *buts) 4302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 4312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *old_bt, *bt = NULL; 4322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct dentry *dir = NULL; 4332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret, i; 4342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 435171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (!buts->buf_size || !buts->buf_nr) 4362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 4372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4380497b345e7d067109e0dd9bf9f4978a6847ee13bJens Axboe strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); 4390497b345e7d067109e0dd9bf9f4978a6847ee13bJens Axboe buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; 4402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 4422056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * some device names have larger paths - convert the slashes 4432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * to underscores for this to work as expected 4442056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 445171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann for (i = 0; i < strlen(buts->name); i++) 446171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (buts->name[i] == '/') 447171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann buts->name[i] = '_'; 4482056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4492056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = kzalloc(sizeof(*bt), GFP_KERNEL); 4502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt) 451ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan return -ENOMEM; 4522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 453ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan ret = -ENOMEM; 4542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->sequence = alloc_percpu(unsigned long); 4552056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->sequence) 4562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 458f0ef03985130287c6c84ebe69416cf790e6cc00eIngo Molnar bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 45964565911cdb57c2f512a9715b985b5617402cc67Jens Axboe if (!bt->msg_data) 46064565911cdb57c2f512a9715b985b5617402cc67Jens Axboe goto err; 46164565911cdb57c2f512a9715b985b5617402cc67Jens Axboe 4622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOENT; 463f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 464b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_lock(&blk_tree_mutex); 465f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe if (!blk_tree_root) { 466f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe blk_tree_root = debugfs_create_dir("block", NULL); 467b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan if (!blk_tree_root) { 468b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_unlock(&blk_tree_mutex); 4691a17662ea033674a58bad3603531b0b5d42572f6Li Zefan goto err; 470b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan } 471f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe } 472b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_unlock(&blk_tree_mutex); 473f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 474f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe dir = debugfs_create_dir(buts->name, blk_tree_root); 475f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 4762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!dir) 4772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->dir = dir; 4806da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt bt->dev = dev; 4812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe atomic_set(&bt->dropped, 0); 4822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EIO; 484939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, 485939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo &blk_dropped_fops); 4862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->dropped_file) 4872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 48902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); 49002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (!bt->msg_file) 49102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle goto err; 49202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 493171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->rchan = relay_open("trace", dir, buts->buf_size, 494171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann buts->buf_nr, &blk_relay_callbacks, bt); 4952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->rchan) 4962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 498171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->act_mask = buts->act_mask; 4992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->act_mask) 5002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->act_mask = (u16) -1; 5012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5029908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan blk_trace_setup_lba(bt, bdev); 5032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 504d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du /* overwrite with user settings */ 505d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (buts->start_lba) 506d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du bt->start_lba = buts->start_lba; 507d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (buts->end_lba) 508d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du bt->end_lba = buts->end_lba; 509d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du 510171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->pid = buts->pid; 5112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_setup; 5122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EBUSY; 5142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe old_bt = xchg(&q->blk_trace, bt); 5152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (old_bt) { 5162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe (void) xchg(&q->blk_trace, old_bt); 5172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 5182056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5192056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 52017ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 521cbe28296eb1ac441b35cf45804d0ae808add7dd1Li Zefan blk_register_tracepoints(); 522cbe28296eb1ac441b35cf45804d0ae808add7dd1Li Zefan 5232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 5242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboeerr: 525ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 5262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 5272056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 528171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 5296da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 530d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du struct block_device *bdev, 5316da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt char __user *arg) 532171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann{ 533171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann struct blk_user_trace_setup buts; 534171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann int ret; 535171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 536171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann ret = copy_from_user(&buts, arg, sizeof(buts)); 537171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (ret) 538171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return -EFAULT; 539171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 540d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 541171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (ret) 542171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return ret; 543171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 5449a8c28c8311e30ba97499447d5a11662f5aea094Dmitry Monakhov if (copy_to_user(arg, &buts, sizeof(buts))) { 5459a8c28c8311e30ba97499447d5a11662f5aea094Dmitry Monakhov blk_trace_remove(q); 546171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return -EFAULT; 5479a8c28c8311e30ba97499447d5a11662f5aea094Dmitry Monakhov } 548171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return 0; 549171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann} 5506da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_setup); 5512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5526da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_startstop(struct request_queue *q, int start) 5532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 5542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret; 555939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 5562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 557939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo if (bt == NULL) 5582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 5592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 5612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * For starting a trace, we can transition from a setup or stopped 5622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * trace. For stopping a trace, the state must be running 5632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 5642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EINVAL; 5652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (start) { 5662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_setup || 5672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state == Blktrace_stopped) { 5682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe blktrace_seq++; 5692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe smp_mb(); 5702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_running; 571be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 572be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch trace_note_time(bt); 5732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = 0; 5742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } else { 5762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_running) { 5772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_stopped; 5782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe relay_flush(bt->rchan); 5792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = 0; 5802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 5842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 5856da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_startstop); 5862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/** 5882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_trace_ioctl: - handle the ioctls associated with tracing 5892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @bdev: the block device 590ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt * @cmd: the ioctl cmd 5912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @arg: the argument data, if any 5922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 5932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe **/ 5942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboeint blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) 5952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 596165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboe struct request_queue *q; 5972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret, start = 0; 5986da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt char b[BDEVNAME_SIZE]; 5992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe q = bdev_get_queue(bdev); 6012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!q) 6022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -ENXIO; 6032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe mutex_lock(&bdev->bd_mutex); 6052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe switch (cmd) { 6072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESETUP: 608f36f21ecca9ee688301174e5f2e0827827a7a7ffJean Delvare bdevname(bdev, b); 609d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 6102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 6112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESTART: 6122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe start = 1; 6132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESTOP: 6142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = blk_trace_startstop(q, start); 6152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 6162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACETEARDOWN: 6172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = blk_trace_remove(q); 6182056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 6192056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe default: 6202056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOTTY; 6212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 6222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 6232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe mutex_unlock(&bdev->bd_mutex); 6252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 6262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6272056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/** 6292056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_trace_shutdown: - stop and cleanup trace structures 6302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @q: the request queue associated with the device 6312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 6322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe **/ 633165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboevoid blk_trace_shutdown(struct request_queue *q) 6342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 6356c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan if (q->blk_trace) { 6366c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan blk_trace_startstop(q, 0); 6376c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan blk_trace_remove(q); 6386c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan } 6392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/* 6425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blktrace probes 6435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo */ 6445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 6465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_rq - Add a trace for a request oriented action 6475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 6485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @rq: the source request 6495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @what: the action 6505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 6525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Records an action against a request. Will log the bio offset + size. 6535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 6545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 6555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq(struct request_queue *q, struct request *rq, 6565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo u32 what) 6575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 6595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo int rw = rq->cmd_flags & 0x03; 6605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 6625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 6635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (blk_discard_rq(rq)) 6655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo rw |= (1 << BIO_RW_DISCARD); 6665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (blk_pc_request(rq)) { 6685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo what |= BLK_TC_ACT(BLK_TC_PC); 6692e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo __blk_add_trace(bt, 0, blk_rq_bytes(rq), rw, 6702e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo what, rq->errors, rq->cmd_len, rq->cmd); 6715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } else { 6725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo what |= BLK_TC_ACT(BLK_TC_FS); 6732e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), rw, 6742e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo what, rq->errors, 0, NULL); 6755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 6765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6775f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq_abort(struct request_queue *q, struct request *rq) 6795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_ABORT); 6815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq_insert(struct request_queue *q, struct request *rq) 6845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_INSERT); 6865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq_issue(struct request_queue *q, struct request *rq) 6895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_ISSUE); 6915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 693939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_rq_requeue(struct request_queue *q, 694939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct request *rq) 6955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 6965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_REQUEUE); 6975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 6985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 699939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_rq_complete(struct request_queue *q, 700939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct request *rq) 7015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_COMPLETE); 7035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 7065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_bio - Add a trace for a bio oriented action 7075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 7085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @bio: the source bio 7095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @what: the action 7105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 7115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 7125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Records an action against a bio. Will log the bio offset + size. 7135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 7145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 7155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio(struct request_queue *q, struct bio *bio, 7165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo u32 what) 7175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7205f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 7215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 7225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, 7245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo !bio_flagged(bio, BIO_UPTODATE), 0, NULL); 7255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio_bounce(struct request_queue *q, struct bio *bio) 7285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_BOUNCE); 7305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7315f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7325f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio_complete(struct request_queue *q, struct bio *bio) 7335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_COMPLETE); 7355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 737939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_bio_backmerge(struct request_queue *q, 738939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio) 7395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE); 7415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 743939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_bio_frontmerge(struct request_queue *q, 744939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio) 7455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE); 7475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio_queue(struct request_queue *q, struct bio *bio) 7505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_QUEUE); 7525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 754939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_getrq(struct request_queue *q, 755939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio, int rw) 7565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bio) 7585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_GETRQ); 7595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else { 7605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 7635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL); 7645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 768939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melostatic void blk_add_trace_sleeprq(struct request_queue *q, 769939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio, int rw) 7705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bio) 7725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ); 7735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else { 7745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 777939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ, 778939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo 0, 0, NULL); 7795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_plug(struct request_queue *q) 7835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 7875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL); 7885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_unplug_io(struct request_queue *q) 7915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 7955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 7965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 7975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_IO, 0, 7995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 8005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_unplug_timer(struct request_queue *q) 8045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 8085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 8095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 8105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_TIMER, 0, 8125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 8135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_split(struct request_queue *q, struct bio *bio, 8175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu) 8185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8205f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 8225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 8235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 8255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE), 8265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 8275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 8315f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_remap - Add a trace for a remap operation 8325f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 8335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @bio: the source bio 8345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @dev: target device 835a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle * @from: source sector 8365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 8385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Device mapper or raid target sometimes need to split a bio because 8395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * it spans a stripe (or similar). Add a trace for that action. 8405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 8425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_remap(struct request_queue *q, struct bio *bio, 84322a7c31a9659deaddafbbcec6562d44141e84474Alan D. Brunelle dev_t dev, sector_t from) 8445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_io_trace_remap r; 8475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 8495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 8505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 851a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r.device_from = cpu_to_be32(dev); 852a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev); 853a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r.sector_from = cpu_to_be64(from); 8545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 85522a7c31a9659deaddafbbcec6562d44141e84474Alan D. Brunelle __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 85622a7c31a9659deaddafbbcec6562d44141e84474Alan D. Brunelle BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), 85722a7c31a9659deaddafbbcec6562d44141e84474Alan D. Brunelle sizeof(r), &r); 8585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 861b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * blk_add_trace_rq_remap - Add a trace for a request-remap operation 862b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @q: queue the io is for 863b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @rq: the source request 864b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @dev: target device 865b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @from: source sector 866b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * 867b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * Description: 868b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * Device mapper remaps request to other devices. 869b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * Add a trace for that action. 870b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * 871b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura **/ 872b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomurastatic void blk_add_trace_rq_remap(struct request_queue *q, 873b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura struct request *rq, dev_t dev, 874b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura sector_t from) 875b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura{ 876b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura struct blk_trace *bt = q->blk_trace; 877b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura struct blk_io_trace_remap r; 878b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 879b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura if (likely(!bt)) 880b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura return; 881b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 882b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura r.device_from = cpu_to_be32(dev); 883b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); 884b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura r.sector_from = cpu_to_be64(from); 885b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 886b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 887b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura rq_data_dir(rq), BLK_TA_REMAP, !!rq->errors, 888b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura sizeof(r), &r); 889b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura} 890b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 891b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura/** 8925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_driver_data - Add binary message with driver-specific data 8935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 8945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @rq: io request 8955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @data: driver-specific data 8965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @len: length of driver-specific data 8975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 8985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 8995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Some drivers might want to write driver-specific data per request. 9005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 9015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 9025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melovoid blk_add_driver_data(struct request_queue *q, 9035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct request *rq, 9045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo void *data, size_t len) 9055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 9065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 9075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 9095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 9105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (blk_pc_request(rq)) 9122e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 9132e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else 9152e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 9162e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 9185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(blk_add_driver_data); 9195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9203c289ba7c320560ee74979a8895141c829046a2dLi Zefanstatic void blk_register_tracepoints(void) 9215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 9225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo int ret; 9235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_abort(blk_add_trace_rq_abort); 9255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_insert(blk_add_trace_rq_insert); 9275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_issue(blk_add_trace_rq_issue); 9295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue); 9315f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9325f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_rq_complete(blk_add_trace_rq_complete); 9335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce); 9355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_complete(blk_add_trace_bio_complete); 9375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge); 9395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge); 9415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_bio_queue(blk_add_trace_bio_queue); 9435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_getrq(blk_add_trace_getrq); 9455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_sleeprq(blk_add_trace_sleeprq); 9475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_plug(blk_add_trace_plug); 9495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_unplug_timer(blk_add_trace_unplug_timer); 9515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_unplug_io(blk_add_trace_unplug_io); 9535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_split(blk_add_trace_split); 9555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 9565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo ret = register_trace_block_remap(blk_add_trace_remap); 9575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 958b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura ret = register_trace_block_rq_remap(blk_add_trace_rq_remap); 959b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura WARN_ON(ret); 9605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 9615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_unregister_tracepoints(void) 9635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 964b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura unregister_trace_block_rq_remap(blk_add_trace_rq_remap); 9655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_remap(blk_add_trace_remap); 9665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_split(blk_add_trace_split); 9675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_unplug_io(blk_add_trace_unplug_io); 9685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_unplug_timer(blk_add_trace_unplug_timer); 9695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_plug(blk_add_trace_plug); 9705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_sleeprq(blk_add_trace_sleeprq); 9715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_getrq(blk_add_trace_getrq); 9725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_queue(blk_add_trace_bio_queue); 9735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge); 9745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge); 9755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_complete(blk_add_trace_bio_complete); 9765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce); 9775f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_complete(blk_add_trace_rq_complete); 9785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue); 9795f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_issue(blk_add_trace_rq_issue); 9805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_insert(blk_add_trace_rq_insert); 9815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unregister_trace_block_rq_abort(blk_add_trace_rq_abort); 9825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo tracepoint_synchronize_unregister(); 9845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 985c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 986c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 987c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * struct blk_io_tracer formatting routines 988c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 989c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 990c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void fill_rwbs(char *rwbs, const struct blk_io_trace *t) 991c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 992157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo int i = 0; 99365796348e09880e12b97267d39b8857c758440a6Li Zefan int tc = t->action >> BLK_TC_SHIFT; 994157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 99518cea4591a98817697017bcb056a848bae1205dfLi Zefan if (t->action == BLK_TN_MESSAGE) { 99618cea4591a98817697017bcb056a848bae1205dfLi Zefan rwbs[i++] = 'N'; 99718cea4591a98817697017bcb056a848bae1205dfLi Zefan goto out; 99818cea4591a98817697017bcb056a848bae1205dfLi Zefan } 99918cea4591a98817697017bcb056a848bae1205dfLi Zefan 100065796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_DISCARD) 1001157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'D'; 100265796348e09880e12b97267d39b8857c758440a6Li Zefan else if (tc & BLK_TC_WRITE) 1003157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'W'; 1004157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else if (t->bytes) 1005157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'R'; 1006157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else 1007157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'N'; 1008157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 100965796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_AHEAD) 1010157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'A'; 101165796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_BARRIER) 1012157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'B'; 101365796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_SYNC) 1014157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'S'; 101565796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_META) 1016157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'M'; 101718cea4591a98817697017bcb056a848bae1205dfLi Zefanout: 1018157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i] = '\0'; 1019c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1020c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1021c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline 1022c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloconst struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) 1023c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1024c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return (const struct blk_io_trace *)ent; 1025c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1026c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1027c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline const void *pdu_start(const struct trace_entry *ent) 1028c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1029c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent) + 1; 1030c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1031c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 103266de7792c02693b49671afe58c771fde3b092fc7Li Zefanstatic inline u32 t_action(const struct trace_entry *ent) 103366de7792c02693b49671afe58c771fde3b092fc7Li Zefan{ 103466de7792c02693b49671afe58c771fde3b092fc7Li Zefan return te_blk_io_trace(ent)->action; 103566de7792c02693b49671afe58c771fde3b092fc7Li Zefan} 103666de7792c02693b49671afe58c771fde3b092fc7Li Zefan 103766de7792c02693b49671afe58c771fde3b092fc7Li Zefanstatic inline u32 t_bytes(const struct trace_entry *ent) 103866de7792c02693b49671afe58c771fde3b092fc7Li Zefan{ 103966de7792c02693b49671afe58c771fde3b092fc7Li Zefan return te_blk_io_trace(ent)->bytes; 104066de7792c02693b49671afe58c771fde3b092fc7Li Zefan} 104166de7792c02693b49671afe58c771fde3b092fc7Li Zefan 1042c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline u32 t_sec(const struct trace_entry *ent) 1043c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1044c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->bytes >> 9; 1045c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1046c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1047c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline unsigned long long t_sector(const struct trace_entry *ent) 1048c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1049c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->sector; 1050c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1051c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1052c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline __u16 t_error(const struct trace_entry *ent) 1053c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1054e0dc81bec0927fa0c8aabc521793161909eef7a5Li Zefan return te_blk_io_trace(ent)->error; 1055c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1056c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1057c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic __u64 get_pdu_int(const struct trace_entry *ent) 1058c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1059c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const __u64 *val = pdu_start(ent); 1060c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return be64_to_cpu(*val); 1061c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1062c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1063c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void get_pdu_remap(const struct trace_entry *ent, 1064c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_io_trace_remap *r) 1065c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1066c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const struct blk_io_trace_remap *__r = pdu_start(ent); 1067a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle __u64 sector_from = __r->sector_from; 1068c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1069c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo r->device_from = be32_to_cpu(__r->device_from); 1070a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r->device_to = be32_to_cpu(__r->device_to); 1071a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r->sector_from = be64_to_cpu(sector_from); 1072c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1073c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1074b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefantypedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act); 1075b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 1076b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic int blk_log_action_classic(struct trace_iterator *iter, const char *act) 1077c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1078c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char rwbs[6]; 107935ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan unsigned long long ts = iter->ts; 108035ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); 1081c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unsigned secs = (unsigned long)ts; 1082b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1083c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1084c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo fill_rwbs(rwbs, t); 1085c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1086c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(&iter->seq, 108735ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", 1088c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo MAJOR(t->device), MINOR(t->device), iter->cpu, 1089b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan secs, nsec_rem, iter->ent->pid, act, rwbs); 1090c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1091c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1092b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic int blk_log_action(struct trace_iterator *iter, const char *act) 1093c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1094c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char rwbs[6]; 1095b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1096b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 1097c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo fill_rwbs(rwbs, t); 1098b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", 1099c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo MAJOR(t->device), MINOR(t->device), act, rwbs); 1100c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1101c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 110266de7792c02693b49671afe58c771fde3b092fc7Li Zefanstatic int blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent) 110366de7792c02693b49671afe58c771fde3b092fc7Li Zefan{ 1104049862579333cc6cd9e6edfd6987cd0addfd8c59Li Zefan const unsigned char *pdu_buf; 110566de7792c02693b49671afe58c771fde3b092fc7Li Zefan int pdu_len; 110666de7792c02693b49671afe58c771fde3b092fc7Li Zefan int i, end, ret; 110766de7792c02693b49671afe58c771fde3b092fc7Li Zefan 110866de7792c02693b49671afe58c771fde3b092fc7Li Zefan pdu_buf = pdu_start(ent); 110966de7792c02693b49671afe58c771fde3b092fc7Li Zefan pdu_len = te_blk_io_trace(ent)->pdu_len; 111066de7792c02693b49671afe58c771fde3b092fc7Li Zefan 111166de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!pdu_len) 111266de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 1; 111366de7792c02693b49671afe58c771fde3b092fc7Li Zefan 111466de7792c02693b49671afe58c771fde3b092fc7Li Zefan /* find the last zero that needs to be printed */ 111566de7792c02693b49671afe58c771fde3b092fc7Li Zefan for (end = pdu_len - 1; end >= 0; end--) 111666de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (pdu_buf[end]) 111766de7792c02693b49671afe58c771fde3b092fc7Li Zefan break; 111866de7792c02693b49671afe58c771fde3b092fc7Li Zefan end++; 111966de7792c02693b49671afe58c771fde3b092fc7Li Zefan 112066de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!trace_seq_putc(s, '(')) 112166de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 112266de7792c02693b49671afe58c771fde3b092fc7Li Zefan 112366de7792c02693b49671afe58c771fde3b092fc7Li Zefan for (i = 0; i < pdu_len; i++) { 112466de7792c02693b49671afe58c771fde3b092fc7Li Zefan 112566de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = trace_seq_printf(s, "%s%02x", 112666de7792c02693b49671afe58c771fde3b092fc7Li Zefan i == 0 ? "" : " ", pdu_buf[i]); 112766de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!ret) 112866de7792c02693b49671afe58c771fde3b092fc7Li Zefan return ret; 112966de7792c02693b49671afe58c771fde3b092fc7Li Zefan 113066de7792c02693b49671afe58c771fde3b092fc7Li Zefan /* 113166de7792c02693b49671afe58c771fde3b092fc7Li Zefan * stop when the rest is just zeroes and indicate so 113266de7792c02693b49671afe58c771fde3b092fc7Li Zefan * with a ".." appended 113366de7792c02693b49671afe58c771fde3b092fc7Li Zefan */ 113466de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (i == end && end != pdu_len - 1) 113566de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_puts(s, " ..) "); 113666de7792c02693b49671afe58c771fde3b092fc7Li Zefan } 113766de7792c02693b49671afe58c771fde3b092fc7Li Zefan 113866de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_puts(s, ") "); 113966de7792c02693b49671afe58c771fde3b092fc7Li Zefan} 114066de7792c02693b49671afe58c771fde3b092fc7Li Zefan 1141c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent) 1142c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 11434ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 11444ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 11454ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 1146c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 114766de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 114866de7792c02693b49671afe58c771fde3b092fc7Li Zefan int ret; 114966de7792c02693b49671afe58c771fde3b092fc7Li Zefan 115066de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = trace_seq_printf(s, "%u ", t_bytes(ent)); 115166de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!ret) 115266de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 115366de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = blk_log_dump_pdu(s, ent); 115466de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!ret) 115566de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 115666de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "[%s]\n", cmd); 115766de7792c02693b49671afe58c771fde3b092fc7Li Zefan } else { 115866de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_sec(ent)) 115966de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "%llu + %u [%s]\n", 116066de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sector(ent), t_sec(ent), cmd); 116166de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "[%s]\n", cmd); 116266de7792c02693b49671afe58c771fde3b092fc7Li Zefan } 1163c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1164c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1165157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melostatic int blk_log_with_error(struct trace_seq *s, 1166157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo const struct trace_entry *ent) 1167c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 116866de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 116966de7792c02693b49671afe58c771fde3b092fc7Li Zefan int ret; 117066de7792c02693b49671afe58c771fde3b092fc7Li Zefan 117166de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = blk_log_dump_pdu(s, ent); 117266de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (ret) 117366de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "[%d]\n", t_error(ent)); 117466de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 117566de7792c02693b49671afe58c771fde3b092fc7Li Zefan } else { 117666de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_sec(ent)) 117766de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "%llu + %u [%d]\n", 117866de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sector(ent), 117966de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sec(ent), t_error(ent)); 118066de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "%llu [%d]\n", 118166de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sector(ent), t_error(ent)); 118266de7792c02693b49671afe58c771fde3b092fc7Li Zefan } 1183c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1184c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1185c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent) 1186c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1187a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle struct blk_io_trace_remap r = { .device_from = 0, }; 1188c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1189c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo get_pdu_remap(ent, &r); 1190c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", 1191a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle t_sector(ent), t_sec(ent), 1192a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle MAJOR(r.device_from), MINOR(r.device_from), 1193a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle (unsigned long long)r.sector_from); 1194c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1195c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1196c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent) 1197c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 11984ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 11994ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12004ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12014ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12024ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt return trace_seq_printf(s, "[%s]\n", cmd); 1203c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1204c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1205c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent) 1206c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 12074ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 12084ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12094ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12104ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12114ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent)); 1212c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1213c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1214c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_split(struct trace_seq *s, const struct trace_entry *ent) 1215c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 12164ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 12174ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12184ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12194ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 1220c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), 12214ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt get_pdu_int(ent), cmd); 1222c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1223c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 122418cea4591a98817697017bcb056a848bae1205dfLi Zefanstatic int blk_log_msg(struct trace_seq *s, const struct trace_entry *ent) 122518cea4591a98817697017bcb056a848bae1205dfLi Zefan{ 122618cea4591a98817697017bcb056a848bae1205dfLi Zefan int ret; 122718cea4591a98817697017bcb056a848bae1205dfLi Zefan const struct blk_io_trace *t = te_blk_io_trace(ent); 122818cea4591a98817697017bcb056a848bae1205dfLi Zefan 122918cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = trace_seq_putmem(s, t + 1, t->pdu_len); 123018cea4591a98817697017bcb056a848bae1205dfLi Zefan if (ret) 123118cea4591a98817697017bcb056a848bae1205dfLi Zefan return trace_seq_putc(s, '\n'); 123218cea4591a98817697017bcb056a848bae1205dfLi Zefan return ret; 123318cea4591a98817697017bcb056a848bae1205dfLi Zefan} 123418cea4591a98817697017bcb056a848bae1205dfLi Zefan 1235c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1236c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * struct tracer operations 1237c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1238c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1239c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_print_header(struct seq_file *m) 1240c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1241c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 1242c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 1243c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" 1244c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo "# | | | | | |\n"); 1245c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1246c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1247c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_start(struct trace_array *tr) 1248c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1249ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_tracer_enabled = true; 1250c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1251c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1252c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_tracer_init(struct trace_array *tr) 1253c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1254c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tr = tr; 1255c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_start(tr); 1256c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1257c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1258c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1259c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_stop(struct trace_array *tr) 1260c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1261ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_tracer_enabled = false; 1262c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1263c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1264c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_reset(struct trace_array *tr) 1265c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1266c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_stop(tr); 1267c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1268c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1269e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefanstatic const struct { 1270c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *act[2]; 1271ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt int (*print)(struct trace_seq *s, const struct trace_entry *ent); 1272e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefan} what2act[] = { 1273ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, 1274c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, 1275c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, 1276c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, 1277c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, 1278c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, 1279c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, 1280c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, 1281c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, 1282c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, 1283c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, 1284c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, 1285c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, 1286c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, 1287c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, 1288c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1289c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1290b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic enum print_line_t print_one_line(struct trace_iterator *iter, 1291b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan bool classic) 1292c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 12932c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo struct trace_seq *s = &iter->seq; 1294b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t; 1295b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan u16 what; 1296c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int ret; 1297b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan bool long_act; 1298b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan blk_log_action_t *log_action; 1299c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1300b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan t = te_blk_io_trace(iter->ent); 1301b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan what = t->action & ((1 << BLK_TC_SHIFT) - 1); 1302b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan long_act = !!(trace_flags & TRACE_ITER_VERBOSE); 1303b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan log_action = classic ? &blk_log_action_classic : &blk_log_action; 130408a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 130518cea4591a98817697017bcb056a848bae1205dfLi Zefan if (t->action == BLK_TN_MESSAGE) { 130618cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = log_action(iter, long_act ? "message" : "m"); 130718cea4591a98817697017bcb056a848bae1205dfLi Zefan if (ret) 130818cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = blk_log_msg(s, iter->ent); 130918cea4591a98817697017bcb056a848bae1205dfLi Zefan goto out; 131018cea4591a98817697017bcb056a848bae1205dfLi Zefan } 131118cea4591a98817697017bcb056a848bae1205dfLi Zefan 1312eb08f8eb0673d9c1e62b69ad1b41593e73c40467Li Zefan if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) 1313b78825d608f30a47e3154ab6872a03f0de0c9d45Li Zefan ret = trace_seq_printf(s, "Unknown action %x\n", what); 1314c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else { 1315b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan ret = log_action(iter, what2act[what].act[long_act]); 1316c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret) 13172c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo ret = what2act[what].print(s, iter->ent); 1318c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 131918cea4591a98817697017bcb056a848bae1205dfLi Zefanout: 1320c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 1321c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1322c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1323b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic enum print_line_t blk_trace_event_print(struct trace_iterator *iter, 1324b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan int flags) 1325b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan{ 1326b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return print_one_line(iter, false); 1327b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan} 1328b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 132908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melostatic int blk_trace_synthesize_old_trace(struct trace_iterator *iter) 133008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo{ 133108a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct trace_seq *s = &iter->seq; 133208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; 133308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo const int offset = offsetof(struct blk_io_trace, sector); 133408a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct blk_io_trace old = { 133508a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, 13366c051ce0307526adec32a847f0daa1af2124f0a9Li Zefan .time = iter->ts, 133708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo }; 133808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 133908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo if (!trace_seq_putmem(s, &old, offset)) 134008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return 0; 134108a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return trace_seq_putmem(s, &t->sector, 134208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo sizeof(old) - offset + t->pdu_len); 134308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo} 134408a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1345ae7462b4f1fe1f36b5d562dbd5202a2eba01f072Arnaldo Carvalho de Melostatic enum print_line_t 1346ae7462b4f1fe1f36b5d562dbd5202a2eba01f072Arnaldo Carvalho de Meloblk_trace_event_print_binary(struct trace_iterator *iter, int flags) 134708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo{ 134808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return blk_trace_synthesize_old_trace(iter) ? 134908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 135008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo} 135108a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1352c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) 1353c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1354c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 1355c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return TRACE_TYPE_UNHANDLED; 1356c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1357b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return print_one_line(iter, true); 1358c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1359c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1360f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefanstatic int blk_tracer_set_flag(u32 old_flags, u32 bit, int set) 1361f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan{ 1362f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan /* don't output context-info for blk_classic output */ 1363f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan if (bit == TRACE_BLK_OPT_CLASSIC) { 1364f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan if (set) 1365f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan trace_flags &= ~TRACE_ITER_CONTEXT_INFO; 1366f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan else 1367f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan trace_flags |= TRACE_ITER_CONTEXT_INFO; 1368f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan } 1369f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan return 0; 1370f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan} 1371f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan 1372c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer blk_tracer __read_mostly = { 1373c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .name = "blk", 1374c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .init = blk_tracer_init, 1375c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .reset = blk_tracer_reset, 1376c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .start = blk_tracer_start, 1377c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .stop = blk_tracer_stop, 1378c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .print_header = blk_tracer_print_header, 1379c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .print_line = blk_tracer_print_line, 1380c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .flags = &blk_tracer_flags, 1381f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan .set_flag = blk_tracer_set_flag, 1382c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1383c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1384c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct trace_event trace_blk_event = { 1385ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt .type = TRACE_BLK, 1386c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .trace = blk_trace_event_print, 138708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .binary = blk_trace_event_print_binary, 1388c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1389c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1390c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int __init init_blk_tracer(void) 1391c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1392c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!register_ftrace_event(&trace_blk_event)) { 1393c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo pr_warning("Warning: could not register block events\n"); 1394c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 1; 1395c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1396c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1397c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (register_tracer(&blk_tracer) != 0) { 1398c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo pr_warning("Warning: could not register the block tracer\n"); 1399c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unregister_ftrace_event(&trace_blk_event); 1400c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 1; 1401c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1402c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1403c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1404c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1405c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1406c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melodevice_initcall(init_blk_tracer); 1407c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1408c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_trace_remove_queue(struct request_queue *q) 1409c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1410c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_trace *bt; 1411c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1412c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt = xchg(&q->blk_trace, NULL); 1413c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bt == NULL) 1414c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return -EINVAL; 1415c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 141617ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_dec_and_test(&blk_probes_ref)) 141717ba97e347bec9bbc47a0877c7a098708982129dLi Zefan blk_unregister_tracepoints(); 141817ba97e347bec9bbc47a0877c7a098708982129dLi Zefan 1419ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 1420c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1421c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1422c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1423c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1424c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * Setup everything required to start tracing 1425c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 14269908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefanstatic int blk_trace_setup_queue(struct request_queue *q, 14279908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan struct block_device *bdev) 1428c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1429c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_trace *old_bt, *bt = NULL; 143018cea4591a98817697017bcb056a848bae1205dfLi Zefan int ret = -ENOMEM; 1431c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1432c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt = kzalloc(sizeof(*bt), GFP_KERNEL); 1433c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!bt) 143415152e448b693fa41de40f1e40ffbe717a3aab88Li Zefan return -ENOMEM; 1435c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 143618cea4591a98817697017bcb056a848bae1205dfLi Zefan bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 143718cea4591a98817697017bcb056a848bae1205dfLi Zefan if (!bt->msg_data) 143818cea4591a98817697017bcb056a848bae1205dfLi Zefan goto free_bt; 143918cea4591a98817697017bcb056a848bae1205dfLi Zefan 14409908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->dev = bdev->bd_dev; 1441c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt->act_mask = (u16)-1; 14429908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 14439908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan blk_trace_setup_lba(bt, bdev); 1444c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1445c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo old_bt = xchg(&q->blk_trace, bt); 1446c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (old_bt != NULL) { 1447c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo (void)xchg(&q->blk_trace, old_bt); 144818cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = -EBUSY; 144918cea4591a98817697017bcb056a848bae1205dfLi Zefan goto free_bt; 1450c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 145115152e448b693fa41de40f1e40ffbe717a3aab88Li Zefan 145217ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 145317ba97e347bec9bbc47a0877c7a098708982129dLi Zefan blk_register_tracepoints(); 1454c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 145518cea4591a98817697017bcb056a848bae1205dfLi Zefan 145618cea4591a98817697017bcb056a848bae1205dfLi Zefanfree_bt: 145718cea4591a98817697017bcb056a848bae1205dfLi Zefan blk_trace_free(bt); 145818cea4591a98817697017bcb056a848bae1205dfLi Zefan return ret; 1459c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1460c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1461c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1462c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * sysfs interface to enable and configure tracing 1463c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1464c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1465c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_show(struct device *dev, 1466c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1467c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf); 1468c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_store(struct device *dev, 1469c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1470c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count); 1471c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo#define BLK_TRACE_DEVICE_ATTR(_name) \ 1472c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ 1473c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_attr_show, \ 1474c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_attr_store) 1475c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1476cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanstatic BLK_TRACE_DEVICE_ATTR(enable); 1477c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(act_mask); 1478c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(pid); 1479c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(start_lba); 1480c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(end_lba); 1481c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1482c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct attribute *blk_trace_attrs[] = { 1483c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_enable.attr, 1484c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_act_mask.attr, 1485c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_pid.attr, 1486c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_start_lba.attr, 1487c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_end_lba.attr, 1488c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo NULL 1489c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1490c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1491c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostruct attribute_group blk_trace_attr_group = { 1492c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .name = "trace", 1493c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .attrs = blk_trace_attrs, 1494c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1495c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1496093419971e03362a00f499960557c119982ea09fLi Zefanstatic const struct { 1497093419971e03362a00f499960557c119982ea09fLi Zefan int mask; 1498093419971e03362a00f499960557c119982ea09fLi Zefan const char *str; 1499093419971e03362a00f499960557c119982ea09fLi Zefan} mask_maps[] = { 1500093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_READ, "read" }, 1501093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_WRITE, "write" }, 1502093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_BARRIER, "barrier" }, 1503093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_SYNC, "sync" }, 1504093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_QUEUE, "queue" }, 1505093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_REQUEUE, "requeue" }, 1506093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_ISSUE, "issue" }, 1507093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_COMPLETE, "complete" }, 1508093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_FS, "fs" }, 1509093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_PC, "pc" }, 1510093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_AHEAD, "ahead" }, 1511093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_META, "meta" }, 1512093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_DISCARD, "discard" }, 1513093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_DRV_DATA, "drv_data" }, 1514093419971e03362a00f499960557c119982ea09fLi Zefan}; 1515093419971e03362a00f499960557c119982ea09fLi Zefan 1516093419971e03362a00f499960557c119982ea09fLi Zefanstatic int blk_trace_str2mask(const char *str) 1517c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1518093419971e03362a00f499960557c119982ea09fLi Zefan int i; 1519c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int mask = 0; 15209eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan char *buf, *s, *token; 1521c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 15229eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan buf = kstrdup(str, GFP_KERNEL); 15239eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan if (buf == NULL) 1524c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return -ENOMEM; 15259eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan s = strstrip(buf); 1526c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1527c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo while (1) { 1528093419971e03362a00f499960557c119982ea09fLi Zefan token = strsep(&s, ","); 1529093419971e03362a00f499960557c119982ea09fLi Zefan if (token == NULL) 1530c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo break; 1531c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1532093419971e03362a00f499960557c119982ea09fLi Zefan if (*token == '\0') 1533093419971e03362a00f499960557c119982ea09fLi Zefan continue; 1534093419971e03362a00f499960557c119982ea09fLi Zefan 1535093419971e03362a00f499960557c119982ea09fLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 1536093419971e03362a00f499960557c119982ea09fLi Zefan if (strcasecmp(token, mask_maps[i].str) == 0) { 1537093419971e03362a00f499960557c119982ea09fLi Zefan mask |= mask_maps[i].mask; 1538093419971e03362a00f499960557c119982ea09fLi Zefan break; 1539093419971e03362a00f499960557c119982ea09fLi Zefan } 1540093419971e03362a00f499960557c119982ea09fLi Zefan } 1541093419971e03362a00f499960557c119982ea09fLi Zefan if (i == ARRAY_SIZE(mask_maps)) { 1542093419971e03362a00f499960557c119982ea09fLi Zefan mask = -EINVAL; 1543093419971e03362a00f499960557c119982ea09fLi Zefan break; 1544093419971e03362a00f499960557c119982ea09fLi Zefan } 1545c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 15469eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan kfree(buf); 1547c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1548c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return mask; 1549c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1550c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1551093419971e03362a00f499960557c119982ea09fLi Zefanstatic ssize_t blk_trace_mask2str(char *buf, int mask) 1552093419971e03362a00f499960557c119982ea09fLi Zefan{ 1553093419971e03362a00f499960557c119982ea09fLi Zefan int i; 1554093419971e03362a00f499960557c119982ea09fLi Zefan char *p = buf; 1555093419971e03362a00f499960557c119982ea09fLi Zefan 1556093419971e03362a00f499960557c119982ea09fLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 1557093419971e03362a00f499960557c119982ea09fLi Zefan if (mask & mask_maps[i].mask) { 1558093419971e03362a00f499960557c119982ea09fLi Zefan p += sprintf(p, "%s%s", 1559093419971e03362a00f499960557c119982ea09fLi Zefan (p == buf) ? "" : ",", mask_maps[i].str); 1560093419971e03362a00f499960557c119982ea09fLi Zefan } 1561093419971e03362a00f499960557c119982ea09fLi Zefan } 1562093419971e03362a00f499960557c119982ea09fLi Zefan *p++ = '\n'; 1563093419971e03362a00f499960557c119982ea09fLi Zefan 1564093419971e03362a00f499960557c119982ea09fLi Zefan return p - buf; 1565093419971e03362a00f499960557c119982ea09fLi Zefan} 1566093419971e03362a00f499960557c119982ea09fLi Zefan 1567b125130b22d67f249beba10b71a254558b5279d0Li Zefanstatic struct request_queue *blk_trace_get_queue(struct block_device *bdev) 1568b125130b22d67f249beba10b71a254558b5279d0Li Zefan{ 1569b125130b22d67f249beba10b71a254558b5279d0Li Zefan if (bdev->bd_disk == NULL) 1570b125130b22d67f249beba10b71a254558b5279d0Li Zefan return NULL; 1571b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1572b125130b22d67f249beba10b71a254558b5279d0Li Zefan return bdev_get_queue(bdev); 1573b125130b22d67f249beba10b71a254558b5279d0Li Zefan} 1574b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1575c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_show(struct device *dev, 1576c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1577c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf) 1578c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1579c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p = dev_to_part(dev); 1580c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1581c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1582c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ssize_t ret = -ENXIO; 1583c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1584c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo lock_kernel(); 1585c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1586c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 1587c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_unlock_kernel; 1588c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1589b125130b22d67f249beba10b71a254558b5279d0Li Zefan q = blk_trace_get_queue(bdev); 1590c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1591c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1592b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1593c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1594cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1595cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (attr == &dev_attr_enable) { 1596cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan ret = sprintf(buf, "%u\n", !!q->blk_trace); 1597cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan goto out_unlock_bdev; 1598cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan } 1599cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1600c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q->blk_trace == NULL) 1601c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "disabled\n"); 1602c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_act_mask) 1603093419971e03362a00f499960557c119982ea09fLi Zefan ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); 1604c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_pid) 1605c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%u\n", q->blk_trace->pid); 1606c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_start_lba) 1607c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); 1608c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_end_lba) 1609c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); 1610cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1611cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanout_unlock_bdev: 1612c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1613c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1614c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 1615c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_unlock_kernel: 1616c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unlock_kernel(); 1617c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret; 1618c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1619c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1620c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_store(struct device *dev, 1621c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1622c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count) 1623c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1624c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1625c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1626c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p; 1627c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo u64 value; 1628093419971e03362a00f499960557c119982ea09fLi Zefan ssize_t ret = -EINVAL; 1629c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1630c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (count == 0) 1631c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1632c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1633c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (attr == &dev_attr_act_mask) { 1634c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (sscanf(buf, "%llx", &value) != 1) { 1635c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo /* Assume it is a list of trace category names */ 1636093419971e03362a00f499960557c119982ea09fLi Zefan ret = blk_trace_str2mask(buf); 1637093419971e03362a00f499960557c119982ea09fLi Zefan if (ret < 0) 1638c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1639093419971e03362a00f499960557c119982ea09fLi Zefan value = ret; 1640c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1641c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } else if (sscanf(buf, "%llu", &value) != 1) 1642c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1643c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1644093419971e03362a00f499960557c119982ea09fLi Zefan ret = -ENXIO; 1645093419971e03362a00f499960557c119982ea09fLi Zefan 1646c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo lock_kernel(); 1647c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo p = dev_to_part(dev); 1648c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1649c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 1650c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_unlock_kernel; 1651c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1652b125130b22d67f249beba10b71a254558b5279d0Li Zefan q = blk_trace_get_queue(bdev); 1653c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1654c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1655c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1656c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1657cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1658cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (attr == &dev_attr_enable) { 1659cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (value) 16609908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan ret = blk_trace_setup_queue(q, bdev); 1661cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan else 1662cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan ret = blk_trace_remove_queue(q); 1663cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan goto out_unlock_bdev; 1664cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan } 1665cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1666c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = 0; 1667c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q->blk_trace == NULL) 16689908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan ret = blk_trace_setup_queue(q, bdev); 1669c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1670c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret == 0) { 1671c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (attr == &dev_attr_act_mask) 1672c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->act_mask = value; 1673c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_pid) 1674c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->pid = value; 1675c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_start_lba) 1676c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->start_lba = value; 1677c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_end_lba) 1678c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->end_lba = value; 1679c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1680cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1681cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanout_unlock_bdev: 1682c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1683c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1684c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 1685c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_unlock_kernel: 1686c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unlock_kernel(); 1687c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout: 1688cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan return ret ? ret : count; 1689c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1690cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 16911d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefanint blk_trace_init_sysfs(struct device *dev) 16921d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan{ 16931d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); 16941d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan} 16951d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan 169648c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelacvoid blk_trace_remove_sysfs(struct device *dev) 169748c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac{ 169848c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac sysfs_remove_group(&dev->kobj, &blk_trace_attr_group); 169948c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac} 170048c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac 170155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#endif /* CONFIG_BLK_DEV_IO_TRACE */ 170255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 170355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#ifdef CONFIG_EVENT_TRACING 170455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 170555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefanvoid blk_dump_cmd(char *buf, struct request *rq) 170655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan{ 170755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int i, end; 170855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int len = rq->cmd_len; 170955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan unsigned char *cmd = rq->cmd; 171055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 171155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (!blk_pc_request(rq)) { 171255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan buf[0] = '\0'; 171355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan return; 171455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan } 171555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 171655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan for (end = len - 1; end >= 0; end--) 171755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (cmd[end]) 171855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan break; 171955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan end++; 172055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 172155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan for (i = 0; i < len; i++) { 172255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]); 172355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (i == end && end != len - 1) { 172455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan sprintf(buf, " .."); 172555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan break; 172655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan } 172755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan } 172855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan} 172955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 173055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefanvoid blk_fill_rwbs(char *rwbs, u32 rw, int bytes) 173155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan{ 173255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int i = 0; 173355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 173455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (rw & WRITE) 173555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'W'; 173655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan else if (rw & 1 << BIO_RW_DISCARD) 173755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'D'; 173855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan else if (bytes) 173955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'R'; 174055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan else 174155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'N'; 174255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 174355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (rw & 1 << BIO_RW_AHEAD) 174455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'A'; 174555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (rw & 1 << BIO_RW_BARRIER) 174655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'B'; 174755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (rw & 1 << BIO_RW_SYNCIO) 174855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'S'; 174955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (rw & 1 << BIO_RW_META) 175055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'M'; 175155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 175255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i] = '\0'; 175355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan} 175455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 175555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefanvoid blk_fill_rwbs_rq(char *rwbs, struct request *rq) 175655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan{ 175755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int rw = rq->cmd_flags & 0x03; 175855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int bytes; 175955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 176055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (blk_discard_rq(rq)) 176155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rw |= (1 << BIO_RW_DISCARD); 176255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 1763c9059598ea8981d02356eead3188bf7fa4d717b8Linus Torvalds bytes = blk_rq_bytes(rq); 176455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 176555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan blk_fill_rwbs(rwbs, rw, bytes); 176655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan} 176755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 176855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#endif /* CONFIG_EVENT_TRACING */ 176955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 1770