blktrace.c revision 805f6b5e1cbfedfb9b3d354013e7f4b13a79270f
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> 26be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch#include <linux/time.h> 27939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo#include <linux/uaccess.h> 2855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 2955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#include <trace/events/block.h> 3055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 312db270a80b8f2238e536876cfb3987af02684df8Frederic Weisbecker#include "trace_output.h" 322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#ifdef CONFIG_BLK_DEV_IO_TRACE 3455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic unsigned int blktrace_seq __read_mostly = 1; 362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 37c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct trace_array *blk_tr; 385006ea73f38caef6065d1136808413813271633fLi Zefanstatic bool blk_tracer_enabled __read_mostly; 39c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 40c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* Select an alternative, minimalistic output than the original one */ 41ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt#define TRACE_BLK_OPT_CLASSIC 0x1 42c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 43c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer_opt blk_tracer_opts[] = { 44c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo /* Default disable the minimalistic output */ 45157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) }, 46c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo { } 47c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 48c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 49c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer_flags blk_tracer_flags = { 50c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .val = 0, 51c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .opts = blk_tracer_opts, 52c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 53c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/* Global reference count of probes */ 555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic atomic_t blk_probes_ref = ATOMIC_INIT(0); 565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 573c289ba7c320560ee74979a8895141c829046a2dLi Zefanstatic void blk_register_tracepoints(void); 585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_unregister_tracepoints(void); 595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 61be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch * Send out a notify message. 62be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch */ 63a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboestatic void trace_note(struct blk_trace *bt, pid_t pid, int action, 64a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe const void *data, size_t len) 65be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch{ 66be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch struct blk_io_trace *t; 6718cea4591a98817697017bcb056a848bae1205dfLi Zefan struct ring_buffer_event *event = NULL; 68e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt struct ring_buffer *buffer = NULL; 6918cea4591a98817697017bcb056a848bae1205dfLi Zefan int pc = 0; 7018cea4591a98817697017bcb056a848bae1205dfLi Zefan int cpu = smp_processor_id(); 7118cea4591a98817697017bcb056a848bae1205dfLi Zefan bool blk_tracer = blk_tracer_enabled; 7218cea4591a98817697017bcb056a848bae1205dfLi Zefan 7318cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 74e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt buffer = blk_tr->buffer; 7518cea4591a98817697017bcb056a848bae1205dfLi Zefan pc = preempt_count(); 76e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BLK, 7718cea4591a98817697017bcb056a848bae1205dfLi Zefan sizeof(*t) + len, 7818cea4591a98817697017bcb056a848bae1205dfLi Zefan 0, pc); 7918cea4591a98817697017bcb056a848bae1205dfLi Zefan if (!event) 8018cea4591a98817697017bcb056a848bae1205dfLi Zefan return; 8118cea4591a98817697017bcb056a848bae1205dfLi Zefan t = ring_buffer_event_data(event); 8218cea4591a98817697017bcb056a848bae1205dfLi Zefan goto record_it; 8318cea4591a98817697017bcb056a848bae1205dfLi Zefan } 84be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 85c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!bt->rchan) 86c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 87c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 88be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch t = relay_reserve(bt->rchan, sizeof(*t) + len); 89d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe if (t) { 90d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 912997c8c4a0b179e8b834a7f30ba4323f2c60ccf4Ingo Molnar t->time = ktime_to_ns(ktime_get()); 9218cea4591a98817697017bcb056a848bae1205dfLi Zefanrecord_it: 93d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->device = bt->dev; 94d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->action = action; 95d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->pid = pid; 96d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->cpu = cpu; 97d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe t->pdu_len = len; 98d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe memcpy((void *) t + sizeof(*t), data, len); 9918cea4591a98817697017bcb056a848bae1205dfLi Zefan 10018cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) 101e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt trace_buffer_unlock_commit(buffer, event, 0, pc); 102d3d9d2a5ea9770db07aeb13a07f999aa48e8f865Jens Axboe } 103be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch} 104be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 105be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch/* 1062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Send out a notify for this process, if we haven't done so since a trace 1072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * started 1082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 1092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk) 1102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 111a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe tsk->btrace_seq = blktrace_seq; 112a863055b1066be1b8e1107f71be01daeed6bde31Jens Axboe trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm)); 113be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch} 1142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 115be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirchstatic void trace_note_time(struct blk_trace *bt) 116be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch{ 117be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch struct timespec now; 118be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch unsigned long flags; 119be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch u32 words[2]; 120be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 121be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch getnstimeofday(&now); 122be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch words[0] = now.tv_sec; 123be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch words[1] = now.tv_nsec; 124be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 125be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch local_irq_save(flags); 126be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words)); 127be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch local_irq_restore(flags); 1282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 1292056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1309d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunellevoid __trace_note_message(struct blk_trace *bt, const char *fmt, ...) 1319d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle{ 1329d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle int n; 1339d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_list args; 13414a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde unsigned long flags; 13564565911cdb57c2f512a9715b985b5617402cc67Jens Axboe char *buf; 1369d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 13718cea4591a98817697017bcb056a848bae1205dfLi Zefan if (unlikely(bt->trace_state != Blktrace_running && 13818cea4591a98817697017bcb056a848bae1205dfLi Zefan !blk_tracer_enabled)) 139c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 140c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 141490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma /* 142490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma * If the BLK_TC_NOTIFY action mask isn't set, don't send any note 143490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma * message to the trace. 144490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma */ 145490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma if (!(bt->act_mask & BLK_TC_NOTIFY)) 146490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma return; 147490da40d82b31c0562d3f5edb37810f492ca1c34Tao Ma 14814a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde local_irq_save(flags); 14964565911cdb57c2f512a9715b985b5617402cc67Jens Axboe buf = per_cpu_ptr(bt->msg_data, smp_processor_id()); 1509d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_start(args, fmt); 15164565911cdb57c2f512a9715b985b5617402cc67Jens Axboe n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); 1529d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle va_end(args); 1539d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 15464565911cdb57c2f512a9715b985b5617402cc67Jens Axboe trace_note(bt, 0, BLK_TN_MESSAGE, buf, n); 15514a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde local_irq_restore(flags); 1569d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle} 1579d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. BrunelleEXPORT_SYMBOL_GPL(__trace_note_message); 1589d5f09a424a67ddb959829894efb4c71cbf6d600Alan D. Brunelle 1592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, 1602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid_t pid) 1612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 1622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) 1632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 164d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (sector && (sector < bt->start_lba || sector > bt->end_lba)) 1652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->pid && pid != bt->pid) 1672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 1682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 1702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 1712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 1732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Data direction bit lookup 1742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 175e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefanstatic const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), 176e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefan BLK_TC_ACT(BLK_TC_WRITE) }; 1772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1787b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig#define BLK_TC_RAHEAD BLK_TC_AHEAD 1797b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig 18035ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse/* The ilog2() calls fall out because they're constant */ 1817b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig#define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \ 1827b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name)) 1832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 1842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 1852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * The worker for the various blk_add_trace*() types. Fills out a 1862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_io_trace structure and places it in a per-cpu subbuffer. 1872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 1885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, 1892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int rw, u32 what, int error, int pdu_len, void *pdu_data) 1902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 1912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct task_struct *tsk = current; 192c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct ring_buffer_event *event = NULL; 193e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt struct ring_buffer *buffer = NULL; 1942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_io_trace *t; 1950a9877514c4fed10a70720293b37213dd172ee3eArnaldo Carvalho de Melo unsigned long flags = 0; 1962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe unsigned long *sequence; 1972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid_t pid; 198c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int cpu, pc = 0; 19918cea4591a98817697017bcb056a848bae1205dfLi Zefan bool blk_tracer = blk_tracer_enabled; 2002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 20118cea4591a98817697017bcb056a848bae1205dfLi Zefan if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) 2022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return; 2032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe what |= ddir_act[rw & WRITE]; 2057b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig what |= MASK_TC_BIT(rw, SYNC); 2067b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig what |= MASK_TC_BIT(rw, RAHEAD); 20735ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, META); 20835ba8f7083e87602b695d6eaca38a6464d5b74dbDavid Woodhouse what |= MASK_TC_BIT(rw, DISCARD); 2092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe pid = tsk->pid; 211d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (act_log_check(bt, what, sector, pid)) 2122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return; 213c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo cpu = raw_smp_processor_id(); 214c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 21518cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 216c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo tracing_record_cmdline(current); 217c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 218e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt buffer = blk_tr->buffer; 21951a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo pc = preempt_count(); 220e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BLK, 22151a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo sizeof(*t) + pdu_len, 22251a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo 0, pc); 223c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!event) 224c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 22551a763dd84253bab1d0a1e68e11a7753d1b702caArnaldo Carvalho de Melo t = ring_buffer_event_data(event); 226c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto record_it; 227c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 2282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2292056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 2302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * A word about the locking here - we disable interrupts to reserve 2312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * some space in the relay per-cpu buffer, to prevent an irq 23214a73f54798f39854e521fb596da7d50b7566bbdCarl Henrik Lunde * from coming in and stepping on our toes. 2332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 2342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe local_irq_save(flags); 2352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (unlikely(tsk->btrace_seq != blktrace_seq)) 2372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe trace_note_tsk(bt, tsk); 2382056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len); 2402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (t) { 2412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe sequence = per_cpu_ptr(bt->sequence, cpu); 2422056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 2442056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->sequence = ++(*sequence); 2452997c8c4a0b179e8b834a7f30ba4323f2c60ccf4Ingo Molnar t->time = ktime_to_ns(ktime_get()); 246c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melorecord_it: 24708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo /* 248939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * These two are not needed in ftrace as they are in the 249939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * generic trace_entry, filled by tracing_generic_entry_update, 250939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * but for the trace_event->bin() synthesizer benefit we do it 251939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo * here too. 252939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo */ 253939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo t->cpu = cpu; 254939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo t->pid = pid; 25508a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 2562056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->sector = sector; 2572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->bytes = bytes; 2582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->action = what; 2592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->device = bt->dev; 2602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->error = error; 2612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe t->pdu_len = pdu_len; 2622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (pdu_len) 2642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe memcpy((void *) t + sizeof(*t), pdu_data, pdu_len); 265c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 26618cea4591a98817697017bcb056a848bae1205dfLi Zefan if (blk_tracer) { 267e77405ad80f53966524b5c31244e13fbbbecbd84Steven Rostedt trace_buffer_unlock_commit(buffer, event, 0, pc); 268c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 269c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 2702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 2712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe local_irq_restore(flags); 2732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct dentry *blk_tree_root; 27611a57153e3377ffdf8cfca2eda9a99063f66b957Jens Axboestatic DEFINE_MUTEX(blk_tree_mutex); 2772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 278ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefanstatic void blk_trace_free(struct blk_trace *bt) 2792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 28002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle debugfs_remove(bt->msg_file); 2812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(bt->dropped_file); 282f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe relay_close(bt->rchan); 28339cbb602b543e477df71dca84b5b2e36f8bd29fcAlan D. Brunelle debugfs_remove(bt->dir); 2842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe free_percpu(bt->sequence); 28564565911cdb57c2f512a9715b985b5617402cc67Jens Axboe free_percpu(bt->msg_data); 2862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe kfree(bt); 287ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan} 288ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan 289ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefanstatic void blk_trace_cleanup(struct blk_trace *bt) 290ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan{ 291ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 2925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (atomic_dec_and_test(&blk_probes_ref)) 2935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_unregister_tracepoints(); 2942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 2952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 2966da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_remove(struct request_queue *q) 2972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 2982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt; 2992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = xchg(&q->blk_trace, NULL); 3012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt) 3022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 3032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3045554720482a631702146a959db22fe417740e0a6Li Zefan if (bt->trace_state != Blktrace_running) 3052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe blk_trace_cleanup(bt); 3062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3096da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_remove); 3102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_dropped_open(struct inode *inode, struct file *filp) 3122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3138e18e2941c53416aa219708e7dcad21fb4bd6794Theodore Ts'o filp->private_data = inode->i_private; 3142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3162056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3182056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic ssize_t blk_dropped_read(struct file *filp, char __user *buffer, 3192056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe size_t count, loff_t *ppos) 3202056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt = filp->private_data; 3222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe char buf[16]; 3232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); 3252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 3272056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3292b8693c0617e972fc0b2fd1ebf8de97e15b656c3Arjan van de Venstatic const struct file_operations blk_dropped_fops = { 3302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .owner = THIS_MODULE, 3312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .open = blk_dropped_open, 3322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .read = blk_dropped_read, 3336038f373a3dc1f1c26496e60b6c40b164716f07eArnd Bergmann .llseek = default_llseek, 3342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe}; 3352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 33602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic int blk_msg_open(struct inode *inode, struct file *filp) 33702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle{ 33802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle filp->private_data = inode->i_private; 33902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 34002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return 0; 34102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle} 34202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 34302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic ssize_t blk_msg_write(struct file *filp, const char __user *buffer, 34402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle size_t count, loff_t *ppos) 34502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle{ 34602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle char *msg; 34702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle struct blk_trace *bt; 34802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 3497635b03adf3d7b84da7649b81efa91e6ebf11b85Li Zefan if (count >= BLK_TN_MAX_MSG) 35002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -EINVAL; 35102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 352a4b3ada83d06554d307dd54abdc62b2e5648264aCarl Henrik Lunde msg = kmalloc(count + 1, GFP_KERNEL); 35302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (msg == NULL) 35402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -ENOMEM; 35502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 35602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (copy_from_user(msg, buffer, count)) { 35702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle kfree(msg); 35802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return -EFAULT; 35902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle } 36002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 361a4b3ada83d06554d307dd54abdc62b2e5648264aCarl Henrik Lunde msg[count] = '\0'; 36202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle bt = filp->private_data; 36302c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle __trace_note_message(bt, "%s", msg); 36402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle kfree(msg); 36502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 36602c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle return count; 36702c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle} 36802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 36902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunellestatic const struct file_operations blk_msg_fops = { 37002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .owner = THIS_MODULE, 37102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .open = blk_msg_open, 37202c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle .write = blk_msg_write, 3736038f373a3dc1f1c26496e60b6c40b164716f07eArnd Bergmann .llseek = noop_llseek, 37402c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle}; 37502c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 3762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 3772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Keep track of how many times we encountered a full subbuffer, to aid 3782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * the user space app in telling how many lost events there were. 3792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 3802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, 3812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe void *prev_subbuf, size_t prev_padding) 3822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3832056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *bt; 3842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!relay_buf_full(buf)) 3862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 1; 3872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = buf->chan->private_data; 3892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe atomic_inc(&bt->dropped); 3902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 3932056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic int blk_remove_buf_file_callback(struct dentry *dentry) 3942056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 3952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe debugfs_remove(dentry); 396f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 3972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 3982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 3992056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct dentry *blk_create_buf_file_callback(const char *filename, 4012056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct dentry *parent, 4022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int mode, 4032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct rchan_buf *buf, 4042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int *is_global) 4052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 4062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return debugfs_create_file(filename, mode, parent, buf, 4072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe &relay_file_operations); 4082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 4092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboestatic struct rchan_callbacks blk_relay_callbacks = { 4112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .subbuf_start = blk_subbuf_start_callback, 4122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .create_buf_file = blk_create_buf_file_callback, 4132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe .remove_buf_file = blk_remove_buf_file_callback, 4142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe}; 4152056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4169908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefanstatic void blk_trace_setup_lba(struct blk_trace *bt, 4179908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan struct block_device *bdev) 4189908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan{ 4199908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan struct hd_struct *part = NULL; 4209908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 4219908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan if (bdev) 4229908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan part = bdev->bd_part; 4239908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 4249908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan if (part) { 4259908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->start_lba = part->start_sect; 4269908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->end_lba = part->start_sect + part->nr_sects; 4279908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan } else { 4289908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->start_lba = 0; 4299908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->end_lba = -1ULL; 4309908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan } 4319908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan} 4329908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 4332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/* 4342056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * Setup everything required to start tracing 4352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 4366da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 437d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du struct block_device *bdev, 438d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du struct blk_user_trace_setup *buts) 4392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 4402056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct blk_trace *old_bt, *bt = NULL; 4412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe struct dentry *dir = NULL; 4422056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret, i; 4432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 444171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (!buts->buf_size || !buts->buf_nr) 4452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 4462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4470497b345e7d067109e0dd9bf9f4978a6847ee13bJens Axboe strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); 4480497b345e7d067109e0dd9bf9f4978a6847ee13bJens Axboe buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; 4492056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 4512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * some device names have larger paths - convert the slashes 4522056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * to underscores for this to work as expected 4532056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 454171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann for (i = 0; i < strlen(buts->name); i++) 455171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (buts->name[i] == '/') 456171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann buts->name[i] = '_'; 4572056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4582056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt = kzalloc(sizeof(*bt), GFP_KERNEL); 4592056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt) 460ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan return -ENOMEM; 4612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 462ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan ret = -ENOMEM; 4632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->sequence = alloc_percpu(unsigned long); 4642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->sequence) 4652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 467f0ef03985130287c6c84ebe69416cf790e6cc00eIngo Molnar bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 46864565911cdb57c2f512a9715b985b5617402cc67Jens Axboe if (!bt->msg_data) 46964565911cdb57c2f512a9715b985b5617402cc67Jens Axboe goto err; 47064565911cdb57c2f512a9715b985b5617402cc67Jens Axboe 4712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOENT; 472f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 473b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_lock(&blk_tree_mutex); 474f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe if (!blk_tree_root) { 475f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe blk_tree_root = debugfs_create_dir("block", NULL); 476b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan if (!blk_tree_root) { 477b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_unlock(&blk_tree_mutex); 4781a17662ea033674a58bad3603531b0b5d42572f6Li Zefan goto err; 479b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan } 480f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe } 481b5230b56ee6caeb27cedb7753c0c319646383bb4Li Zefan mutex_unlock(&blk_tree_mutex); 482f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 483f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe dir = debugfs_create_dir(buts->name, blk_tree_root); 484f48fc4d32e24c0b6a18aad30305d819bcc68c049Jens Axboe 4852056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!dir) 4862056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4872056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4882056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->dir = dir; 4896da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt bt->dev = dev; 4902056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe atomic_set(&bt->dropped, 0); 4912056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 4922056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EIO; 493939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, 494939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo &blk_dropped_fops); 4952056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->dropped_file) 4962056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 4972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 49802c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); 49902c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle if (!bt->msg_file) 50002c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle goto err; 50102c62304e6af60f1963695c6bc1bbffe619aa585Alan D. Brunelle 502171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->rchan = relay_open("trace", dir, buts->buf_size, 503171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann buts->buf_nr, &blk_relay_callbacks, bt); 5042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->rchan) 5052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 5062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 507171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->act_mask = buts->act_mask; 5082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!bt->act_mask) 5092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->act_mask = (u16) -1; 5102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5119908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan blk_trace_setup_lba(bt, bdev); 5122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 513d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du /* overwrite with user settings */ 514d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (buts->start_lba) 515d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du bt->start_lba = buts->start_lba; 516d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du if (buts->end_lba) 517d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du bt->end_lba = buts->end_lba; 518d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du 519171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann bt->pid = buts->pid; 5202056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_setup; 5212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 5222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EBUSY; 5232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe old_bt = xchg(&q->blk_trace, bt); 5242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (old_bt) { 5252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe (void) xchg(&q->blk_trace, old_bt); 5262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe goto err; 5272056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 5282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 52917ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 530cbe28296eb1ac441b35cf45804d0ae808add7dd1Li Zefan blk_register_tracepoints(); 531cbe28296eb1ac441b35cf45804d0ae808add7dd1Li Zefan 5322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return 0; 5332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboeerr: 534ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 5352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 5362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 537171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 5386da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 539d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du struct block_device *bdev, 5406da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt char __user *arg) 541171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann{ 542171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann struct blk_user_trace_setup buts; 543171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann int ret; 544171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 545171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann ret = copy_from_user(&buts, arg, sizeof(buts)); 546171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (ret) 547171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return -EFAULT; 548171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 549d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 550171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann if (ret) 551171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return ret; 552171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann 5539a8c28c8311e30ba97499447d5a11662f5aea094Dmitry Monakhov if (copy_to_user(arg, &buts, sizeof(buts))) { 5549a8c28c8311e30ba97499447d5a11662f5aea094Dmitry Monakhov blk_trace_remove(q); 555171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return -EFAULT; 5569a8c28c8311e30ba97499447d5a11662f5aea094Dmitry Monakhov } 557171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann return 0; 558171044d449611c6e5040b37210ff6aba47f33ee4Arnd Bergmann} 5596da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_setup); 5602056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 56162c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 56262c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmannstatic int compat_blk_trace_setup(struct request_queue *q, char *name, 56362c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann dev_t dev, struct block_device *bdev, 56462c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann char __user *arg) 56562c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann{ 56662c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann struct blk_user_trace_setup buts; 56762c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann struct compat_blk_user_trace_setup cbuts; 56862c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann int ret; 56962c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 57062c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann if (copy_from_user(&cbuts, arg, sizeof(cbuts))) 57162c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann return -EFAULT; 57262c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 57362c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann buts = (struct blk_user_trace_setup) { 57462c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .act_mask = cbuts.act_mask, 57562c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .buf_size = cbuts.buf_size, 57662c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .buf_nr = cbuts.buf_nr, 57762c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .start_lba = cbuts.start_lba, 57862c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .end_lba = cbuts.end_lba, 57962c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann .pid = cbuts.pid, 58062c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann }; 58162c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann memcpy(&buts.name, &cbuts.name, 32); 58262c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 58362c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 58462c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann if (ret) 58562c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann return ret; 58662c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 58762c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann if (copy_to_user(arg, &buts.name, 32)) { 58862c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann blk_trace_remove(q); 58962c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann return -EFAULT; 59062c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann } 59162c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 59262c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann return 0; 59362c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann} 59462c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann#endif 59562c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann 5966da127ad0918f93ea93678dad62ce15ffed18797Christof Schmittint blk_trace_startstop(struct request_queue *q, int start) 5972056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 5982056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret; 599939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 6002056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 601939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo if (bt == NULL) 6022056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -EINVAL; 6032056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6042056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe /* 6052056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * For starting a trace, we can transition from a setup or stopped 6062056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * trace. For stopping a trace, the state must be running 6072056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe */ 6082056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -EINVAL; 6092056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (start) { 6102056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_setup || 6112056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state == Blktrace_stopped) { 6122056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe blktrace_seq++; 6132056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe smp_mb(); 6142056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_running; 615be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch 616be1c63411addba3ad750eb4fdfc50b97bc82825eOlaf Kirch trace_note_time(bt); 6172056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = 0; 6182056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 6192056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } else { 6202056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (bt->trace_state == Blktrace_running) { 6212056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe bt->trace_state = Blktrace_stopped; 6222056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe relay_flush(bt->rchan); 6232056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = 0; 6242056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 6252056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 6262056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6272056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 6282056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6296da127ad0918f93ea93678dad62ce15ffed18797Christof SchmittEXPORT_SYMBOL_GPL(blk_trace_startstop); 6302056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6312056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/** 6322056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_trace_ioctl: - handle the ioctls associated with tracing 6332056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @bdev: the block device 634ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt * @cmd: the ioctl cmd 6352056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @arg: the argument data, if any 6362056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 6372056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe **/ 6382056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboeint blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) 6392056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 640165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboe struct request_queue *q; 6412056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe int ret, start = 0; 6426da127ad0918f93ea93678dad62ce15ffed18797Christof Schmitt char b[BDEVNAME_SIZE]; 6432056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6442056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe q = bdev_get_queue(bdev); 6452056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe if (!q) 6462056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return -ENXIO; 6472056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6482056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe mutex_lock(&bdev->bd_mutex); 6492056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6502056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe switch (cmd) { 6512056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESETUP: 652f36f21ecca9ee688301174e5f2e0827827a7a7ffJean Delvare bdevname(bdev, b); 653d0deef5b14af7d5bbd0003a0a2a1a32326e20a6dShawn Du ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 6542056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 65562c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 65662c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann case BLKTRACESETUP32: 65762c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann bdevname(bdev, b); 65862c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 65962c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann break; 66062c2a7d969f30163f733c81158254b3095b23e72Arnd Bergmann#endif 6612056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESTART: 6622056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe start = 1; 6632056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACESTOP: 6642056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = blk_trace_startstop(q, start); 6652056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 6662056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe case BLKTRACETEARDOWN: 6672056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = blk_trace_remove(q); 6682056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 6692056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe default: 6702056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe ret = -ENOTTY; 6712056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe break; 6722056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe } 6732056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6742056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe mutex_unlock(&bdev->bd_mutex); 6752056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe return ret; 6762056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6772056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe 6782056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe/** 6792056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * blk_trace_shutdown: - stop and cleanup trace structures 6802056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * @q: the request queue associated with the device 6812056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe * 6822056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe **/ 683165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboevoid blk_trace_shutdown(struct request_queue *q) 6842056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe{ 6856c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan if (q->blk_trace) { 6866c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan blk_trace_startstop(q, 0); 6876c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan blk_trace_remove(q); 6886c5c934153513dc72e2d6464f39e8ef1f27c0a3eAlexey Dobriyan } 6892056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4Jens Axboe} 6905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/* 6925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blktrace probes 6935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo */ 6945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 6955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 6965f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_rq - Add a trace for a request oriented action 6975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 6985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @rq: the source request 6995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @what: the action 7005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 7015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 7025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Records an action against a request. Will log the bio offset + size. 7035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 7045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 7055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_rq(struct request_queue *q, struct request *rq, 706805f6b5e1cbfedfb9b3d354013e7f4b13a79270fTao Ma u32 what) 7075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 7115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 7125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 71333659ebbae262228eef4e0fe990f393d1f0ed941Christoph Hellwig if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 7145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo what |= BLK_TC_ACT(BLK_TC_PC); 715805f6b5e1cbfedfb9b3d354013e7f4b13a79270fTao Ma __blk_add_trace(bt, 0, blk_rq_bytes(rq), rq->cmd_flags, 7162e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo what, rq->errors, rq->cmd_len, rq->cmd); 7175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } else { 7185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo what |= BLK_TC_ACT(BLK_TC_FS); 719805f6b5e1cbfedfb9b3d354013e7f4b13a79270fTao Ma __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 720805f6b5e1cbfedfb9b3d354013e7f4b13a79270fTao Ma rq->cmd_flags, what, rq->errors, 0, NULL); 7215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 7225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 72438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_abort(void *ignore, 72538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct request *rq) 7265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_ABORT); 7285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 73038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_insert(void *ignore, 73138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct request *rq) 7325f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_INSERT); 7345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7355f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 73638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_issue(void *ignore, 73738516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct request *rq) 7385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_ISSUE); 7405f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7415f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 74238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_requeue(void *ignore, 74338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 744939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct request *rq) 7455f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_REQUEUE); 7475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 74938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_complete(void *ignore, 75038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 751939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct request *rq) 7525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7535f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo blk_add_trace_rq(q, rq, BLK_TA_COMPLETE); 7545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 7575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_trace_bio - Add a trace for a bio oriented action 7585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 7595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @bio: the source bio 7605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @what: the action 761797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe * @error: error, if any 7625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 7635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 7645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Records an action against a bio. Will log the bio offset + size. 7655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 7665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 7675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_add_trace_bio(struct request_queue *q, struct bio *bio, 768797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe u32 what, int error) 7695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 7705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 7715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 7725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 7735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 7745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 775797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe if (!error && !bio_flagged(bio, BIO_UPTODATE)) 776797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe error = EIO; 777797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe 7785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, 779797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe error, 0, NULL); 7805f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 78238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_bio_bounce(void *ignore, 78338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct bio *bio) 7845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 785797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0); 7865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 78838516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_bio_complete(void *ignore, 78923036f1a340beec19cc451ba9719526c4ffb3a57Mathieu Desnoyers struct request_queue *q, struct bio *bio, 79023036f1a340beec19cc451ba9719526c4ffb3a57Mathieu Desnoyers int error) 7915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 792797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error); 7935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 7945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 79538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_bio_backmerge(void *ignore, 79638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 797939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio) 7985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 799797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0); 8005f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 80238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_bio_frontmerge(void *ignore, 80338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 804939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio) 8055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 806797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0); 8075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8085f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 80938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_bio_queue(void *ignore, 81038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct bio *bio) 8115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 812797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0); 8135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 81538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_getrq(void *ignore, 81638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 817939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio, int rw) 8185f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bio) 820797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0); 8215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else { 8225f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 8255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL); 8265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8275f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 83038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_sleeprq(void *ignore, 83138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 832939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo struct bio *bio, int rw) 8335f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8345f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bio) 835797a455d2c682476c3797dbfecf5bf84c1e3b9d3Jens Axboe blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0); 8365f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else { 8375f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8385f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8395f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 840939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ, 841939b366977d29b5c0d53d1ea3b0b8cefb1e76202Arnaldo Carvalho de Melo 0, 0, NULL); 8425f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8435f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8445f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 84538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_plug(void *ignore, struct request_queue *q) 8465f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8475f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8485f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8495f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) 8505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL); 8515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 85338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_unplug_io(void *ignore, struct request_queue *q) 8545f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8555f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8565f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8575f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 8585f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 8595f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 8605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_IO, 0, 8625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 8635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 86638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_unplug_timer(void *ignore, struct request_queue *q) 8675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 8715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 8725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 8735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_TIMER, 0, 8755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 8765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8775f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 87938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_split(void *ignore, 88038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, struct bio *bio, 8815f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo unsigned int pdu) 8825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 8835f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 8845f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (bt) { 8865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __be64 rpdu = cpu_to_be64(pdu); 8875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8885f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 8895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE), 8905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo sizeof(rpdu), &rpdu); 8915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo } 8925f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 8935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 8945f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 895d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzer * blk_add_trace_bio_remap - Add a trace for a bio-remap operation 896546cf44a1b507c1cbb5cf42bbe6169780567f36fRandy Dunlap * @ignore: trace callback data parameter (not used) 8975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 8985f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @bio: the source bio 8995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @dev: target device 900a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle * @from: source sector 9015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 9025f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 9035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Device mapper or raid target sometimes need to split a bio because 9045f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * it spans a stripe (or similar). Add a trace for that action. 9055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 9065f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 907d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzerstatic void blk_add_trace_bio_remap(void *ignore, 908d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzer struct request_queue *q, struct bio *bio, 909d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzer dev_t dev, sector_t from) 9105f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 9115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 9125f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_io_trace_remap r; 9135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9145f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 9155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 9165f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 917a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r.device_from = cpu_to_be32(dev); 918a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev); 919a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r.sector_from = cpu_to_be64(from); 9205f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 92122a7c31a9659deaddafbbcec6562d44141e84474Alan D. Brunelle __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 92222a7c31a9659deaddafbbcec6562d44141e84474Alan D. Brunelle BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), 92322a7c31a9659deaddafbbcec6562d44141e84474Alan D. Brunelle sizeof(r), &r); 9245f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 9255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9265f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo/** 927b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * blk_add_trace_rq_remap - Add a trace for a request-remap operation 928546cf44a1b507c1cbb5cf42bbe6169780567f36fRandy Dunlap * @ignore: trace callback data parameter (not used) 929b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @q: queue the io is for 930b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @rq: the source request 931b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @dev: target device 932b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * @from: source sector 933b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * 934b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * Description: 935b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * Device mapper remaps request to other devices. 936b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * Add a trace for that action. 937b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura * 938b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura **/ 93938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedtstatic void blk_add_trace_rq_remap(void *ignore, 94038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt struct request_queue *q, 941b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura struct request *rq, dev_t dev, 942b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura sector_t from) 943b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura{ 944b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura struct blk_trace *bt = q->blk_trace; 945b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura struct blk_io_trace_remap r; 946b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 947b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura if (likely(!bt)) 948b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura return; 949b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 950b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura r.device_from = cpu_to_be32(dev); 951b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); 952b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura r.sector_from = cpu_to_be64(from); 953b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 954b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 955b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura rq_data_dir(rq), BLK_TA_REMAP, !!rq->errors, 956b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura sizeof(r), &r); 957b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura} 958b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura 959b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura/** 9605f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * blk_add_driver_data - Add binary message with driver-specific data 9615f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @q: queue the io is for 9625f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @rq: io request 9635f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @data: driver-specific data 9645f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * @len: length of driver-specific data 9655f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 9665f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Description: 9675f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * Some drivers might want to write driver-specific data per request. 9685f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo * 9695f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo **/ 9705f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melovoid blk_add_driver_data(struct request_queue *q, 9715f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct request *rq, 9725f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo void *data, size_t len) 9735f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 9745f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo struct blk_trace *bt = q->blk_trace; 9755f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9765f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo if (likely(!bt)) 9775f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo return; 9785f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 97933659ebbae262228eef4e0fe990f393d1f0ed941Christoph Hellwig if (rq->cmd_type == REQ_TYPE_BLOCK_PC) 9802e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 9812e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9825f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo else 9832e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 9842e46e8b27aa57c6bd34b3102b40ee4d0144b4fabTejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9855f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 9865f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(blk_add_driver_data); 9875f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 9883c289ba7c320560ee74979a8895141c829046a2dLi Zefanstatic void blk_register_tracepoints(void) 9895f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 9905f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo int ret; 9915f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 99238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); 9935f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 99438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); 9955f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 99638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); 9975f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 99838516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); 9995f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 100038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); 10015f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 100238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); 10035f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 100438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); 10055f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 100638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); 10075f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 100838516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); 10095f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 101038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); 10115f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 101238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_getrq(blk_add_trace_getrq, NULL); 10135f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 101438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); 10155f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 101638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_plug(blk_add_trace_plug, NULL); 10175f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 101838516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_unplug_timer(blk_add_trace_unplug_timer, NULL); 10195f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 102038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_unplug_io(blk_add_trace_unplug_io, NULL); 10215f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 102238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_split(blk_add_trace_split, NULL); 10235f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 1024d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzer ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); 10255f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo WARN_ON(ret); 102638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); 1027b0da3f0dada78832c9da03ad2152ae76bd9a2496Jun'ichi Nomura WARN_ON(ret); 10285f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 10295f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 10305f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melostatic void blk_unregister_tracepoints(void) 10315f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo{ 103238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); 1033d07335e51df0c6dec202d315fc4f1f7e100eec4eMike Snitzer unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); 103438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_split(blk_add_trace_split, NULL); 103538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_unplug_io(blk_add_trace_unplug_io, NULL); 103638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_unplug_timer(blk_add_trace_unplug_timer, NULL); 103738516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_plug(blk_add_trace_plug, NULL); 103838516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); 103938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_getrq(blk_add_trace_getrq, NULL); 104038516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); 104138516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); 104238516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); 104338516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); 104438516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); 104538516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); 104638516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); 104738516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); 104838516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); 104938516ab59fbc5b3bb278cf5e1fe2867c70cff32eSteven Rostedt unregister_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); 10505f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo 10515f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo tracepoint_synchronize_unregister(); 10525f3ea37c7716db4e894a480e0c18b24399595b6bArnaldo Carvalho de Melo} 1053c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1054c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1055c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * struct blk_io_tracer formatting routines 1056c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1057c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1058c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void fill_rwbs(char *rwbs, const struct blk_io_trace *t) 1059c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1060157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo int i = 0; 106165796348e09880e12b97267d39b8857c758440a6Li Zefan int tc = t->action >> BLK_TC_SHIFT; 1062157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 106318cea4591a98817697017bcb056a848bae1205dfLi Zefan if (t->action == BLK_TN_MESSAGE) { 106418cea4591a98817697017bcb056a848bae1205dfLi Zefan rwbs[i++] = 'N'; 106518cea4591a98817697017bcb056a848bae1205dfLi Zefan goto out; 106618cea4591a98817697017bcb056a848bae1205dfLi Zefan } 106718cea4591a98817697017bcb056a848bae1205dfLi Zefan 106865796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_DISCARD) 1069157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'D'; 107065796348e09880e12b97267d39b8857c758440a6Li Zefan else if (tc & BLK_TC_WRITE) 1071157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'W'; 1072157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else if (t->bytes) 1073157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'R'; 1074157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo else 1075157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'N'; 1076157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo 107765796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_AHEAD) 1078157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'A'; 107965796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_BARRIER) 1080157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'B'; 108165796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_SYNC) 1082157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'S'; 108365796348e09880e12b97267d39b8857c758440a6Li Zefan if (tc & BLK_TC_META) 1084157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i++] = 'M'; 108518cea4591a98817697017bcb056a848bae1205dfLi Zefanout: 1086157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo rwbs[i] = '\0'; 1087c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1088c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1089c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline 1090c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloconst struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) 1091c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1092c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return (const struct blk_io_trace *)ent; 1093c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1094c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1095c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline const void *pdu_start(const struct trace_entry *ent) 1096c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1097c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent) + 1; 1098c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1099c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 110066de7792c02693b49671afe58c771fde3b092fc7Li Zefanstatic inline u32 t_action(const struct trace_entry *ent) 110166de7792c02693b49671afe58c771fde3b092fc7Li Zefan{ 110266de7792c02693b49671afe58c771fde3b092fc7Li Zefan return te_blk_io_trace(ent)->action; 110366de7792c02693b49671afe58c771fde3b092fc7Li Zefan} 110466de7792c02693b49671afe58c771fde3b092fc7Li Zefan 110566de7792c02693b49671afe58c771fde3b092fc7Li Zefanstatic inline u32 t_bytes(const struct trace_entry *ent) 110666de7792c02693b49671afe58c771fde3b092fc7Li Zefan{ 110766de7792c02693b49671afe58c771fde3b092fc7Li Zefan return te_blk_io_trace(ent)->bytes; 110866de7792c02693b49671afe58c771fde3b092fc7Li Zefan} 110966de7792c02693b49671afe58c771fde3b092fc7Li Zefan 1110c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline u32 t_sec(const struct trace_entry *ent) 1111c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1112c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->bytes >> 9; 1113c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1114c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1115c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline unsigned long long t_sector(const struct trace_entry *ent) 1116c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1117c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return te_blk_io_trace(ent)->sector; 1118c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1119c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1120c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic inline __u16 t_error(const struct trace_entry *ent) 1121c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1122e0dc81bec0927fa0c8aabc521793161909eef7a5Li Zefan return te_blk_io_trace(ent)->error; 1123c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1124c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1125c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic __u64 get_pdu_int(const struct trace_entry *ent) 1126c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1127c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const __u64 *val = pdu_start(ent); 1128c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return be64_to_cpu(*val); 1129c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1130c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1131c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void get_pdu_remap(const struct trace_entry *ent, 1132c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_io_trace_remap *r) 1133c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1134c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const struct blk_io_trace_remap *__r = pdu_start(ent); 1135a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle __u64 sector_from = __r->sector_from; 1136c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1137c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo r->device_from = be32_to_cpu(__r->device_from); 1138a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r->device_to = be32_to_cpu(__r->device_to); 1139a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle r->sector_from = be64_to_cpu(sector_from); 1140c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1141c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1142b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefantypedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act); 1143b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 1144b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic int blk_log_action_classic(struct trace_iterator *iter, const char *act) 1145c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1146c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char rwbs[6]; 114735ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan unsigned long long ts = iter->ts; 114835ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); 1149c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unsigned secs = (unsigned long)ts; 1150b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1151c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1152c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo fill_rwbs(rwbs, t); 1153c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1154c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(&iter->seq, 115535ac51bfe4c293b67ce9f85082ba0b9bc6123c40Li Zefan "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", 1156c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo MAJOR(t->device), MINOR(t->device), iter->cpu, 1157b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan secs, nsec_rem, iter->ent->pid, act, rwbs); 1158c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1159c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1160b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic int blk_log_action(struct trace_iterator *iter, const char *act) 1161c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1162c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char rwbs[6]; 1163b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1164b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 1165c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo fill_rwbs(rwbs, t); 1166b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", 1167c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo MAJOR(t->device), MINOR(t->device), act, rwbs); 1168c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1169c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 117066de7792c02693b49671afe58c771fde3b092fc7Li Zefanstatic int blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent) 117166de7792c02693b49671afe58c771fde3b092fc7Li Zefan{ 1172049862579333cc6cd9e6edfd6987cd0addfd8c59Li Zefan const unsigned char *pdu_buf; 117366de7792c02693b49671afe58c771fde3b092fc7Li Zefan int pdu_len; 117466de7792c02693b49671afe58c771fde3b092fc7Li Zefan int i, end, ret; 117566de7792c02693b49671afe58c771fde3b092fc7Li Zefan 117666de7792c02693b49671afe58c771fde3b092fc7Li Zefan pdu_buf = pdu_start(ent); 117766de7792c02693b49671afe58c771fde3b092fc7Li Zefan pdu_len = te_blk_io_trace(ent)->pdu_len; 117866de7792c02693b49671afe58c771fde3b092fc7Li Zefan 117966de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!pdu_len) 118066de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 1; 118166de7792c02693b49671afe58c771fde3b092fc7Li Zefan 118266de7792c02693b49671afe58c771fde3b092fc7Li Zefan /* find the last zero that needs to be printed */ 118366de7792c02693b49671afe58c771fde3b092fc7Li Zefan for (end = pdu_len - 1; end >= 0; end--) 118466de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (pdu_buf[end]) 118566de7792c02693b49671afe58c771fde3b092fc7Li Zefan break; 118666de7792c02693b49671afe58c771fde3b092fc7Li Zefan end++; 118766de7792c02693b49671afe58c771fde3b092fc7Li Zefan 118866de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!trace_seq_putc(s, '(')) 118966de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 119066de7792c02693b49671afe58c771fde3b092fc7Li Zefan 119166de7792c02693b49671afe58c771fde3b092fc7Li Zefan for (i = 0; i < pdu_len; i++) { 119266de7792c02693b49671afe58c771fde3b092fc7Li Zefan 119366de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = trace_seq_printf(s, "%s%02x", 119466de7792c02693b49671afe58c771fde3b092fc7Li Zefan i == 0 ? "" : " ", pdu_buf[i]); 119566de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!ret) 119666de7792c02693b49671afe58c771fde3b092fc7Li Zefan return ret; 119766de7792c02693b49671afe58c771fde3b092fc7Li Zefan 119866de7792c02693b49671afe58c771fde3b092fc7Li Zefan /* 119966de7792c02693b49671afe58c771fde3b092fc7Li Zefan * stop when the rest is just zeroes and indicate so 120066de7792c02693b49671afe58c771fde3b092fc7Li Zefan * with a ".." appended 120166de7792c02693b49671afe58c771fde3b092fc7Li Zefan */ 120266de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (i == end && end != pdu_len - 1) 120366de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_puts(s, " ..) "); 120466de7792c02693b49671afe58c771fde3b092fc7Li Zefan } 120566de7792c02693b49671afe58c771fde3b092fc7Li Zefan 120666de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_puts(s, ") "); 120766de7792c02693b49671afe58c771fde3b092fc7Li Zefan} 120866de7792c02693b49671afe58c771fde3b092fc7Li Zefan 1209c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent) 1210c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 12114ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 12124ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12134ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 1214c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 121566de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 121666de7792c02693b49671afe58c771fde3b092fc7Li Zefan int ret; 121766de7792c02693b49671afe58c771fde3b092fc7Li Zefan 121866de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = trace_seq_printf(s, "%u ", t_bytes(ent)); 121966de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!ret) 122066de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 122166de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = blk_log_dump_pdu(s, ent); 122266de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (!ret) 122366de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 122466de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "[%s]\n", cmd); 122566de7792c02693b49671afe58c771fde3b092fc7Li Zefan } else { 122666de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_sec(ent)) 122766de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "%llu + %u [%s]\n", 122866de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sector(ent), t_sec(ent), cmd); 122966de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "[%s]\n", cmd); 123066de7792c02693b49671afe58c771fde3b092fc7Li Zefan } 1231c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1232c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1233157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melostatic int blk_log_with_error(struct trace_seq *s, 1234157f9c00e88529ed84bd7d581a40d411e5414cf0Arnaldo Carvalho de Melo const struct trace_entry *ent) 1235c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 123666de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 123766de7792c02693b49671afe58c771fde3b092fc7Li Zefan int ret; 123866de7792c02693b49671afe58c771fde3b092fc7Li Zefan 123966de7792c02693b49671afe58c771fde3b092fc7Li Zefan ret = blk_log_dump_pdu(s, ent); 124066de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (ret) 124166de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "[%d]\n", t_error(ent)); 124266de7792c02693b49671afe58c771fde3b092fc7Li Zefan return 0; 124366de7792c02693b49671afe58c771fde3b092fc7Li Zefan } else { 124466de7792c02693b49671afe58c771fde3b092fc7Li Zefan if (t_sec(ent)) 124566de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "%llu + %u [%d]\n", 124666de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sector(ent), 124766de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sec(ent), t_error(ent)); 124866de7792c02693b49671afe58c771fde3b092fc7Li Zefan return trace_seq_printf(s, "%llu [%d]\n", 124966de7792c02693b49671afe58c771fde3b092fc7Li Zefan t_sector(ent), t_error(ent)); 125066de7792c02693b49671afe58c771fde3b092fc7Li Zefan } 1251c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1252c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1253c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent) 1254c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1255a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle struct blk_io_trace_remap r = { .device_from = 0, }; 1256c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1257c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo get_pdu_remap(ent, &r); 1258c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", 1259a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle t_sector(ent), t_sec(ent), 1260a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle MAJOR(r.device_from), MINOR(r.device_from), 1261a42aaa3bbce85ac487ad4fad5db99e8e91b7aac1Alan D. Brunelle (unsigned long long)r.sector_from); 1262c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1263c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1264c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent) 1265c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 12664ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 12674ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12684ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12694ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12704ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt return trace_seq_printf(s, "[%s]\n", cmd); 1271c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1272c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1273c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent) 1274c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 12754ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 12764ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12774ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12784ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12794ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent)); 1280c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1281c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1282c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_log_split(struct trace_seq *s, const struct trace_entry *ent) 1283c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 12844ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt char cmd[TASK_COMM_LEN]; 12854ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 12864ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12874ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt 1288c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), 12894ca530852346be239b7c19e7bec5d2b78855bebeSteven Rostedt get_pdu_int(ent), cmd); 1290c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1291c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 129218cea4591a98817697017bcb056a848bae1205dfLi Zefanstatic int blk_log_msg(struct trace_seq *s, const struct trace_entry *ent) 129318cea4591a98817697017bcb056a848bae1205dfLi Zefan{ 129418cea4591a98817697017bcb056a848bae1205dfLi Zefan int ret; 129518cea4591a98817697017bcb056a848bae1205dfLi Zefan const struct blk_io_trace *t = te_blk_io_trace(ent); 129618cea4591a98817697017bcb056a848bae1205dfLi Zefan 129718cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = trace_seq_putmem(s, t + 1, t->pdu_len); 129818cea4591a98817697017bcb056a848bae1205dfLi Zefan if (ret) 129918cea4591a98817697017bcb056a848bae1205dfLi Zefan return trace_seq_putc(s, '\n'); 130018cea4591a98817697017bcb056a848bae1205dfLi Zefan return ret; 130118cea4591a98817697017bcb056a848bae1205dfLi Zefan} 130218cea4591a98817697017bcb056a848bae1205dfLi Zefan 1303c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1304c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * struct tracer operations 1305c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1306c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1307c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_print_header(struct seq_file *m) 1308c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1309c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 1310c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return; 1311c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" 1312c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo "# | | | | | |\n"); 1313c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1314c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1315c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_start(struct trace_array *tr) 1316c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1317ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_tracer_enabled = true; 1318c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1319c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1320c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_tracer_init(struct trace_array *tr) 1321c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1322c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tr = tr; 1323c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_start(tr); 1324c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1325c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1326c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1327c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_stop(struct trace_array *tr) 1328c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1329ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_tracer_enabled = false; 1330c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1331c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1332c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic void blk_tracer_reset(struct trace_array *tr) 1333c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1334c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo blk_tracer_stop(tr); 1335c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1336c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1337e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefanstatic const struct { 1338c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *act[2]; 1339ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt int (*print)(struct trace_seq *s, const struct trace_entry *ent); 1340e4955c9986a27bb47ddeb6cd55803053f547e2e9Li Zefan} what2act[] = { 1341ef18012b248b47ec9a12c3a83ca5e99782d39c5dSteven Rostedt [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, 1342c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, 1343c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, 1344c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, 1345c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, 1346c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, 1347c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, 1348c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, 1349c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, 1350c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, 1351c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, 1352c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, 1353c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, 1354c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, 1355c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, 1356c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1357c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1358b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic enum print_line_t print_one_line(struct trace_iterator *iter, 1359b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan bool classic) 1360c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 13612c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo struct trace_seq *s = &iter->seq; 1362b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan const struct blk_io_trace *t; 1363b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan u16 what; 1364c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int ret; 1365b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan bool long_act; 1366b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan blk_log_action_t *log_action; 1367c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1368b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan t = te_blk_io_trace(iter->ent); 1369b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan what = t->action & ((1 << BLK_TC_SHIFT) - 1); 1370b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan long_act = !!(trace_flags & TRACE_ITER_VERBOSE); 1371b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan log_action = classic ? &blk_log_action_classic : &blk_log_action; 137208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 137318cea4591a98817697017bcb056a848bae1205dfLi Zefan if (t->action == BLK_TN_MESSAGE) { 137418cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = log_action(iter, long_act ? "message" : "m"); 137518cea4591a98817697017bcb056a848bae1205dfLi Zefan if (ret) 137618cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = blk_log_msg(s, iter->ent); 137718cea4591a98817697017bcb056a848bae1205dfLi Zefan goto out; 137818cea4591a98817697017bcb056a848bae1205dfLi Zefan } 137918cea4591a98817697017bcb056a848bae1205dfLi Zefan 1380eb08f8eb0673d9c1e62b69ad1b41593e73c40467Li Zefan if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) 1381b78825d608f30a47e3154ab6872a03f0de0c9d45Li Zefan ret = trace_seq_printf(s, "Unknown action %x\n", what); 1382c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else { 1383b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan ret = log_action(iter, what2act[what].act[long_act]); 1384c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret) 13852c9b238eb325895d3312dad64e2685783575e474Arnaldo Carvalho de Melo ret = what2act[what].print(s, iter->ent); 1386c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 138718cea4591a98817697017bcb056a848bae1205dfLi Zefanout: 1388c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 1389c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1390c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1391b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefanstatic enum print_line_t blk_trace_event_print(struct trace_iterator *iter, 1392a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt int flags, struct trace_event *event) 1393b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan{ 1394b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return print_one_line(iter, false); 1395b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan} 1396b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan 139708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melostatic int blk_trace_synthesize_old_trace(struct trace_iterator *iter) 139808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo{ 139908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct trace_seq *s = &iter->seq; 140008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; 140108a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo const int offset = offsetof(struct blk_io_trace, sector); 140208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo struct blk_io_trace old = { 140308a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, 14046c051ce0307526adec32a847f0daa1af2124f0a9Li Zefan .time = iter->ts, 140508a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo }; 140608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 140708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo if (!trace_seq_putmem(s, &old, offset)) 140808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return 0; 140908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return trace_seq_putmem(s, &t->sector, 141008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo sizeof(old) - offset + t->pdu_len); 141108a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo} 141208a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1413ae7462b4f1fe1f36b5d562dbd5202a2eba01f072Arnaldo Carvalho de Melostatic enum print_line_t 1414a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedtblk_trace_event_print_binary(struct trace_iterator *iter, int flags, 1415a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt struct trace_event *event) 141608a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo{ 141708a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo return blk_trace_synthesize_old_trace(iter) ? 141808a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 141908a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo} 142008a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo 1421c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) 1422c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1423c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 1424c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return TRACE_TYPE_UNHANDLED; 1425c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1426b6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10bLi Zefan return print_one_line(iter, true); 1427c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1428c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1429f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefanstatic int blk_tracer_set_flag(u32 old_flags, u32 bit, int set) 1430f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan{ 1431f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan /* don't output context-info for blk_classic output */ 1432f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan if (bit == TRACE_BLK_OPT_CLASSIC) { 1433f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan if (set) 1434f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan trace_flags &= ~TRACE_ITER_CONTEXT_INFO; 1435f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan else 1436f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan trace_flags |= TRACE_ITER_CONTEXT_INFO; 1437f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan } 1438f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan return 0; 1439f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan} 1440f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan 1441c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct tracer blk_tracer __read_mostly = { 1442c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .name = "blk", 1443c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .init = blk_tracer_init, 1444c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .reset = blk_tracer_reset, 1445c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .start = blk_tracer_start, 1446c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .stop = blk_tracer_stop, 1447c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .print_header = blk_tracer_print_header, 1448c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .print_line = blk_tracer_print_line, 1449c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .flags = &blk_tracer_flags, 1450f3948f8857ef5de239f28a61dddb1554a0ae4c2cLi Zefan .set_flag = blk_tracer_set_flag, 1451c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1452c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1453a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedtstatic struct trace_event_functions trace_blk_event_funcs = { 1454c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .trace = blk_trace_event_print, 145508a06b83ff8b2779289f733348c669f31cb65d51Arnaldo Carvalho de Melo .binary = blk_trace_event_print_binary, 1456c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1457c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1458a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedtstatic struct trace_event trace_blk_event = { 1459a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt .type = TRACE_BLK, 1460a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt .funcs = &trace_blk_event_funcs, 1461a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt}; 1462a9a5776380208a3e48a92d0c763ee1a3b486fb73Steven Rostedt 1463c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int __init init_blk_tracer(void) 1464c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1465c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!register_ftrace_event(&trace_blk_event)) { 1466c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo pr_warning("Warning: could not register block events\n"); 1467c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 1; 1468c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1469c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1470c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (register_tracer(&blk_tracer) != 0) { 1471c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo pr_warning("Warning: could not register the block tracer\n"); 1472c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo unregister_ftrace_event(&trace_blk_event); 1473c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 1; 1474c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1475c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1476c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1477c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1478c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1479c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melodevice_initcall(init_blk_tracer); 1480c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1481c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic int blk_trace_remove_queue(struct request_queue *q) 1482c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1483c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_trace *bt; 1484c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1485c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt = xchg(&q->blk_trace, NULL); 1486c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bt == NULL) 1487c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return -EINVAL; 1488c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 148917ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_dec_and_test(&blk_probes_ref)) 149017ba97e347bec9bbc47a0877c7a098708982129dLi Zefan blk_unregister_tracepoints(); 149117ba97e347bec9bbc47a0877c7a098708982129dLi Zefan 1492ad5dd5493a55e462796e42e50a49e76df76fdb05Li Zefan blk_trace_free(bt); 1493c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 1494c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1495c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1496c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1497c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * Setup everything required to start tracing 1498c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 14999908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefanstatic int blk_trace_setup_queue(struct request_queue *q, 15009908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan struct block_device *bdev) 1501c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1502c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct blk_trace *old_bt, *bt = NULL; 150318cea4591a98817697017bcb056a848bae1205dfLi Zefan int ret = -ENOMEM; 1504c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1505c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt = kzalloc(sizeof(*bt), GFP_KERNEL); 1506c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (!bt) 150715152e448b693fa41de40f1e40ffbe717a3aab88Li Zefan return -ENOMEM; 1508c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 150918cea4591a98817697017bcb056a848bae1205dfLi Zefan bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 151018cea4591a98817697017bcb056a848bae1205dfLi Zefan if (!bt->msg_data) 151118cea4591a98817697017bcb056a848bae1205dfLi Zefan goto free_bt; 151218cea4591a98817697017bcb056a848bae1205dfLi Zefan 15139908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan bt->dev = bdev->bd_dev; 1514c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bt->act_mask = (u16)-1; 15159908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan 15169908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan blk_trace_setup_lba(bt, bdev); 1517c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1518c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo old_bt = xchg(&q->blk_trace, bt); 1519c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (old_bt != NULL) { 1520c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo (void)xchg(&q->blk_trace, old_bt); 152118cea4591a98817697017bcb056a848bae1205dfLi Zefan ret = -EBUSY; 152218cea4591a98817697017bcb056a848bae1205dfLi Zefan goto free_bt; 1523c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 152415152e448b693fa41de40f1e40ffbe717a3aab88Li Zefan 152517ba97e347bec9bbc47a0877c7a098708982129dLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 152617ba97e347bec9bbc47a0877c7a098708982129dLi Zefan blk_register_tracepoints(); 1527c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return 0; 152818cea4591a98817697017bcb056a848bae1205dfLi Zefan 152918cea4591a98817697017bcb056a848bae1205dfLi Zefanfree_bt: 153018cea4591a98817697017bcb056a848bae1205dfLi Zefan blk_trace_free(bt); 153118cea4591a98817697017bcb056a848bae1205dfLi Zefan return ret; 1532c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1533c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1534c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo/* 1535c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo * sysfs interface to enable and configure tracing 1536c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo */ 1537c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1538c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_show(struct device *dev, 1539c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1540c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf); 1541c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_store(struct device *dev, 1542c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1543c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count); 1544c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo#define BLK_TRACE_DEVICE_ATTR(_name) \ 1545c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ 1546c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_attr_show, \ 1547c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo sysfs_blk_trace_attr_store) 1548c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1549cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanstatic BLK_TRACE_DEVICE_ATTR(enable); 1550c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(act_mask); 1551c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(pid); 1552c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(start_lba); 1553c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic BLK_TRACE_DEVICE_ATTR(end_lba); 1554c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1555c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic struct attribute *blk_trace_attrs[] = { 1556c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_enable.attr, 1557c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_act_mask.attr, 1558c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_pid.attr, 1559c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_start_lba.attr, 1560c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo &dev_attr_end_lba.attr, 1561c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo NULL 1562c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1563c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1564c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostruct attribute_group blk_trace_attr_group = { 1565c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .name = "trace", 1566c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo .attrs = blk_trace_attrs, 1567c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo}; 1568c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1569093419971e03362a00f499960557c119982ea09fLi Zefanstatic const struct { 1570093419971e03362a00f499960557c119982ea09fLi Zefan int mask; 1571093419971e03362a00f499960557c119982ea09fLi Zefan const char *str; 1572093419971e03362a00f499960557c119982ea09fLi Zefan} mask_maps[] = { 1573093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_READ, "read" }, 1574093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_WRITE, "write" }, 1575093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_BARRIER, "barrier" }, 1576093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_SYNC, "sync" }, 1577093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_QUEUE, "queue" }, 1578093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_REQUEUE, "requeue" }, 1579093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_ISSUE, "issue" }, 1580093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_COMPLETE, "complete" }, 1581093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_FS, "fs" }, 1582093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_PC, "pc" }, 1583093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_AHEAD, "ahead" }, 1584093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_META, "meta" }, 1585093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_DISCARD, "discard" }, 1586093419971e03362a00f499960557c119982ea09fLi Zefan { BLK_TC_DRV_DATA, "drv_data" }, 1587093419971e03362a00f499960557c119982ea09fLi Zefan}; 1588093419971e03362a00f499960557c119982ea09fLi Zefan 1589093419971e03362a00f499960557c119982ea09fLi Zefanstatic int blk_trace_str2mask(const char *str) 1590c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1591093419971e03362a00f499960557c119982ea09fLi Zefan int i; 1592c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo int mask = 0; 15939eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan char *buf, *s, *token; 1594c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 15959eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan buf = kstrdup(str, GFP_KERNEL); 15969eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan if (buf == NULL) 1597c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return -ENOMEM; 15989eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan s = strstrip(buf); 1599c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1600c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo while (1) { 1601093419971e03362a00f499960557c119982ea09fLi Zefan token = strsep(&s, ","); 1602093419971e03362a00f499960557c119982ea09fLi Zefan if (token == NULL) 1603c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo break; 1604c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1605093419971e03362a00f499960557c119982ea09fLi Zefan if (*token == '\0') 1606093419971e03362a00f499960557c119982ea09fLi Zefan continue; 1607093419971e03362a00f499960557c119982ea09fLi Zefan 1608093419971e03362a00f499960557c119982ea09fLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 1609093419971e03362a00f499960557c119982ea09fLi Zefan if (strcasecmp(token, mask_maps[i].str) == 0) { 1610093419971e03362a00f499960557c119982ea09fLi Zefan mask |= mask_maps[i].mask; 1611093419971e03362a00f499960557c119982ea09fLi Zefan break; 1612093419971e03362a00f499960557c119982ea09fLi Zefan } 1613093419971e03362a00f499960557c119982ea09fLi Zefan } 1614093419971e03362a00f499960557c119982ea09fLi Zefan if (i == ARRAY_SIZE(mask_maps)) { 1615093419971e03362a00f499960557c119982ea09fLi Zefan mask = -EINVAL; 1616093419971e03362a00f499960557c119982ea09fLi Zefan break; 1617093419971e03362a00f499960557c119982ea09fLi Zefan } 1618c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 16199eb85125ce218a8b8d9a7c982510388e227adbecLi Zefan kfree(buf); 1620c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1621c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return mask; 1622c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1623c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1624093419971e03362a00f499960557c119982ea09fLi Zefanstatic ssize_t blk_trace_mask2str(char *buf, int mask) 1625093419971e03362a00f499960557c119982ea09fLi Zefan{ 1626093419971e03362a00f499960557c119982ea09fLi Zefan int i; 1627093419971e03362a00f499960557c119982ea09fLi Zefan char *p = buf; 1628093419971e03362a00f499960557c119982ea09fLi Zefan 1629093419971e03362a00f499960557c119982ea09fLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 1630093419971e03362a00f499960557c119982ea09fLi Zefan if (mask & mask_maps[i].mask) { 1631093419971e03362a00f499960557c119982ea09fLi Zefan p += sprintf(p, "%s%s", 1632093419971e03362a00f499960557c119982ea09fLi Zefan (p == buf) ? "" : ",", mask_maps[i].str); 1633093419971e03362a00f499960557c119982ea09fLi Zefan } 1634093419971e03362a00f499960557c119982ea09fLi Zefan } 1635093419971e03362a00f499960557c119982ea09fLi Zefan *p++ = '\n'; 1636093419971e03362a00f499960557c119982ea09fLi Zefan 1637093419971e03362a00f499960557c119982ea09fLi Zefan return p - buf; 1638093419971e03362a00f499960557c119982ea09fLi Zefan} 1639093419971e03362a00f499960557c119982ea09fLi Zefan 1640b125130b22d67f249beba10b71a254558b5279d0Li Zefanstatic struct request_queue *blk_trace_get_queue(struct block_device *bdev) 1641b125130b22d67f249beba10b71a254558b5279d0Li Zefan{ 1642b125130b22d67f249beba10b71a254558b5279d0Li Zefan if (bdev->bd_disk == NULL) 1643b125130b22d67f249beba10b71a254558b5279d0Li Zefan return NULL; 1644b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1645b125130b22d67f249beba10b71a254558b5279d0Li Zefan return bdev_get_queue(bdev); 1646b125130b22d67f249beba10b71a254558b5279d0Li Zefan} 1647b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1648c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_show(struct device *dev, 1649c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1650c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo char *buf) 1651c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1652c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p = dev_to_part(dev); 1653c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1654c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1655c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ssize_t ret = -ENXIO; 1656c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1657c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1658c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 165901b284f9b6d51cc3f3bcf3b49f16d2601d3ca22dArnd Bergmann goto out; 1660c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1661b125130b22d67f249beba10b71a254558b5279d0Li Zefan q = blk_trace_get_queue(bdev); 1662c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1663c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1664b125130b22d67f249beba10b71a254558b5279d0Li Zefan 1665c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1666cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1667cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (attr == &dev_attr_enable) { 1668cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan ret = sprintf(buf, "%u\n", !!q->blk_trace); 1669cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan goto out_unlock_bdev; 1670cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan } 1671cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1672c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q->blk_trace == NULL) 1673c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "disabled\n"); 1674c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_act_mask) 1675093419971e03362a00f499960557c119982ea09fLi Zefan ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); 1676c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_pid) 1677c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%u\n", q->blk_trace->pid); 1678c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_start_lba) 1679c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); 1680c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_end_lba) 1681c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); 1682cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1683cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanout_unlock_bdev: 1684c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1685c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1686c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 168701b284f9b6d51cc3f3bcf3b49f16d2601d3ca22dArnd Bergmannout: 1688c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo return ret; 1689c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1690c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1691c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melostatic ssize_t sysfs_blk_trace_attr_store(struct device *dev, 1692c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct device_attribute *attr, 1693c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo const char *buf, size_t count) 1694c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo{ 1695c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct block_device *bdev; 1696c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct request_queue *q; 1697c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo struct hd_struct *p; 1698c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo u64 value; 1699093419971e03362a00f499960557c119982ea09fLi Zefan ssize_t ret = -EINVAL; 1700c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1701c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (count == 0) 1702c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1703c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1704c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (attr == &dev_attr_act_mask) { 1705c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (sscanf(buf, "%llx", &value) != 1) { 1706c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo /* Assume it is a list of trace category names */ 1707093419971e03362a00f499960557c119982ea09fLi Zefan ret = blk_trace_str2mask(buf); 1708093419971e03362a00f499960557c119982ea09fLi Zefan if (ret < 0) 1709c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1710093419971e03362a00f499960557c119982ea09fLi Zefan value = ret; 1711c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1712c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } else if (sscanf(buf, "%llu", &value) != 1) 1713c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out; 1714c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1715093419971e03362a00f499960557c119982ea09fLi Zefan ret = -ENXIO; 1716093419971e03362a00f499960557c119982ea09fLi Zefan 1717c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo p = dev_to_part(dev); 1718c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdev = bdget(part_devt(p)); 1719c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (bdev == NULL) 172001b284f9b6d51cc3f3bcf3b49f16d2601d3ca22dArnd Bergmann goto out; 1721c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1722b125130b22d67f249beba10b71a254558b5279d0Li Zefan q = blk_trace_get_queue(bdev); 1723c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q == NULL) 1724c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo goto out_bdput; 1725c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1726c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_lock(&bdev->bd_mutex); 1727cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1728cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (attr == &dev_attr_enable) { 1729cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan if (value) 17309908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan ret = blk_trace_setup_queue(q, bdev); 1731cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan else 1732cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan ret = blk_trace_remove_queue(q); 1733cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan goto out_unlock_bdev; 1734cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan } 1735cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1736c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo ret = 0; 1737c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (q->blk_trace == NULL) 17389908c30997b8a73c95f836170b9998dae9aa3f4aLi Zefan ret = blk_trace_setup_queue(q, bdev); 1739c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo 1740c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (ret == 0) { 1741c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo if (attr == &dev_attr_act_mask) 1742c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->act_mask = value; 1743c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_pid) 1744c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->pid = value; 1745c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_start_lba) 1746c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->start_lba = value; 1747c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo else if (attr == &dev_attr_end_lba) 1748c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo q->blk_trace->end_lba = value; 1749c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo } 1750cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 1751cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefanout_unlock_bdev: 1752c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo mutex_unlock(&bdev->bd_mutex); 1753c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout_bdput: 1754c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo bdput(bdev); 1755c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Meloout: 1756cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan return ret ? ret : count; 1757c71a896154119f4ca9e89d6078f5f63ad60ef199Arnaldo Carvalho de Melo} 1758cd649b8bb830d65c57c3c8b98d57b5402256d8bdLi Zefan 17591d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefanint blk_trace_init_sysfs(struct device *dev) 17601d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan{ 17611d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); 17621d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan} 17631d54ad6da9192fed5dd3b60224d9f2dfea0dcd82Li Zefan 176448c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelacvoid blk_trace_remove_sysfs(struct device *dev) 176548c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac{ 176648c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac sysfs_remove_group(&dev->kobj, &blk_trace_attr_group); 176748c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac} 176848c0d4d4c04dd520c55e0fd756fa4e7c83de3d13Zdenek Kabelac 176955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#endif /* CONFIG_BLK_DEV_IO_TRACE */ 177055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 177155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#ifdef CONFIG_EVENT_TRACING 177255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 177355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefanvoid blk_dump_cmd(char *buf, struct request *rq) 177455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan{ 177555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int i, end; 177655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int len = rq->cmd_len; 177755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan unsigned char *cmd = rq->cmd; 177855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 177933659ebbae262228eef4e0fe990f393d1f0ed941Christoph Hellwig if (rq->cmd_type != REQ_TYPE_BLOCK_PC) { 178055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan buf[0] = '\0'; 178155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan return; 178255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan } 178355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 178455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan for (end = len - 1; end >= 0; end--) 178555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (cmd[end]) 178655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan break; 178755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan end++; 178855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 178955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan for (i = 0; i < len; i++) { 179055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]); 179155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (i == end && end != len - 1) { 179255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan sprintf(buf, " .."); 179355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan break; 179455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan } 179555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan } 179655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan} 179755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 179855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefanvoid blk_fill_rwbs(char *rwbs, u32 rw, int bytes) 179955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan{ 180055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan int i = 0; 180155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 180255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan if (rw & WRITE) 180355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'W'; 18047b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig else if (rw & REQ_DISCARD) 180555782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'D'; 180655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan else if (bytes) 180755782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'R'; 180855782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan else 180955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'N'; 181055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 18117b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig if (rw & REQ_RAHEAD) 181255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'A'; 18137b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig if (rw & REQ_SYNC) 181455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'S'; 18157b6d91daee5cac6402186ff224c3af39d79f4a0eChristoph Hellwig if (rw & REQ_META) 181655782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i++] = 'M'; 18178d57a98ccd0b4489003473979da8f5a1363ba7a3Adrian Hunter if (rw & REQ_SECURE) 18188d57a98ccd0b4489003473979da8f5a1363ba7a3Adrian Hunter rwbs[i++] = 'E'; 181955782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 182055782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan rwbs[i] = '\0'; 182155782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan} 182255782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 182355782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan#endif /* CONFIG_EVENT_TRACING */ 182455782138e47d9baf2f7d3a7af9e7cf42adf72c56Li Zefan 1825