12db270a8SFrederic Weisbecker /* 22db270a8SFrederic Weisbecker * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk> 32db270a8SFrederic Weisbecker * 42db270a8SFrederic Weisbecker * This program is free software; you can redistribute it and/or modify 52db270a8SFrederic Weisbecker * it under the terms of the GNU General Public License version 2 as 62db270a8SFrederic Weisbecker * published by the Free Software Foundation. 72db270a8SFrederic Weisbecker * 82db270a8SFrederic Weisbecker * This program is distributed in the hope that it will be useful, 92db270a8SFrederic Weisbecker * but WITHOUT ANY WARRANTY; without even the implied warranty of 102db270a8SFrederic Weisbecker * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 112db270a8SFrederic Weisbecker * GNU General Public License for more details. 122db270a8SFrederic Weisbecker * 132db270a8SFrederic Weisbecker * You should have received a copy of the GNU General Public License 142db270a8SFrederic Weisbecker * along with this program; if not, write to the Free Software 152db270a8SFrederic Weisbecker * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 162db270a8SFrederic Weisbecker * 172db270a8SFrederic Weisbecker */ 182db270a8SFrederic Weisbecker #include <linux/kernel.h> 192db270a8SFrederic Weisbecker #include <linux/blkdev.h> 202db270a8SFrederic Weisbecker #include <linux/blktrace_api.h> 212db270a8SFrederic Weisbecker #include <linux/percpu.h> 222db270a8SFrederic Weisbecker #include <linux/init.h> 232db270a8SFrederic Weisbecker #include <linux/mutex.h> 245a0e3ad6STejun Heo #include <linux/slab.h> 252db270a8SFrederic Weisbecker #include <linux/debugfs.h> 266e5fdeedSPaul Gortmaker #include <linux/export.h> 272db270a8SFrederic Weisbecker #include <linux/time.h> 282db270a8SFrederic Weisbecker #include <linux/uaccess.h> 29a404d557SJan Kara #include <linux/list.h> 3055782138SLi Zefan 3155782138SLi Zefan #include <trace/events/block.h> 3255782138SLi Zefan 332db270a8SFrederic Weisbecker #include "trace_output.h" 342db270a8SFrederic Weisbecker 3555782138SLi Zefan #ifdef CONFIG_BLK_DEV_IO_TRACE 3655782138SLi Zefan 372db270a8SFrederic Weisbecker static unsigned int blktrace_seq __read_mostly = 1; 382db270a8SFrederic Weisbecker 392db270a8SFrederic Weisbecker static struct trace_array *blk_tr; 405006ea73SLi Zefan static bool blk_tracer_enabled __read_mostly; 412db270a8SFrederic Weisbecker 42a404d557SJan Kara static LIST_HEAD(running_trace_list); 43a404d557SJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(running_trace_lock); 44a404d557SJan Kara 452db270a8SFrederic Weisbecker /* Select an alternative, minimalistic output than the original one */ 462db270a8SFrederic Weisbecker #define TRACE_BLK_OPT_CLASSIC 0x1 472db270a8SFrederic Weisbecker 482db270a8SFrederic Weisbecker static struct tracer_opt blk_tracer_opts[] = { 492db270a8SFrederic Weisbecker /* Default disable the minimalistic output */ 502db270a8SFrederic Weisbecker { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) }, 512db270a8SFrederic Weisbecker { } 522db270a8SFrederic Weisbecker }; 532db270a8SFrederic Weisbecker 542db270a8SFrederic Weisbecker static struct tracer_flags blk_tracer_flags = { 552db270a8SFrederic Weisbecker .val = 0, 562db270a8SFrederic Weisbecker .opts = blk_tracer_opts, 572db270a8SFrederic Weisbecker }; 582db270a8SFrederic Weisbecker 592db270a8SFrederic Weisbecker /* Global reference count of probes */ 602db270a8SFrederic Weisbecker static atomic_t blk_probes_ref = ATOMIC_INIT(0); 612db270a8SFrederic Weisbecker 623c289ba7SLi Zefan static void blk_register_tracepoints(void); 632db270a8SFrederic Weisbecker static void blk_unregister_tracepoints(void); 642db270a8SFrederic Weisbecker 652db270a8SFrederic Weisbecker /* 662db270a8SFrederic Weisbecker * Send out a notify message. 672db270a8SFrederic Weisbecker */ 682db270a8SFrederic Weisbecker static void trace_note(struct blk_trace *bt, pid_t pid, int action, 692db270a8SFrederic Weisbecker const void *data, size_t len) 702db270a8SFrederic Weisbecker { 712db270a8SFrederic Weisbecker struct blk_io_trace *t; 7218cea459SLi Zefan struct ring_buffer_event *event = NULL; 73e77405adSSteven Rostedt struct ring_buffer *buffer = NULL; 7418cea459SLi Zefan int pc = 0; 7518cea459SLi Zefan int cpu = smp_processor_id(); 7618cea459SLi Zefan bool blk_tracer = blk_tracer_enabled; 7718cea459SLi Zefan 7818cea459SLi Zefan if (blk_tracer) { 7912883efbSSteven Rostedt (Red Hat) buffer = blk_tr->trace_buffer.buffer; 8018cea459SLi Zefan pc = preempt_count(); 81e77405adSSteven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BLK, 8218cea459SLi Zefan sizeof(*t) + len, 8318cea459SLi Zefan 0, pc); 8418cea459SLi Zefan if (!event) 8518cea459SLi Zefan return; 8618cea459SLi Zefan t = ring_buffer_event_data(event); 8718cea459SLi Zefan goto record_it; 8818cea459SLi Zefan } 892db270a8SFrederic Weisbecker 902db270a8SFrederic Weisbecker if (!bt->rchan) 912db270a8SFrederic Weisbecker return; 922db270a8SFrederic Weisbecker 932db270a8SFrederic Weisbecker t = relay_reserve(bt->rchan, sizeof(*t) + len); 942db270a8SFrederic Weisbecker if (t) { 952db270a8SFrederic Weisbecker t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 962db270a8SFrederic Weisbecker t->time = ktime_to_ns(ktime_get()); 9718cea459SLi Zefan record_it: 982db270a8SFrederic Weisbecker t->device = bt->dev; 992db270a8SFrederic Weisbecker t->action = action; 1002db270a8SFrederic Weisbecker t->pid = pid; 1012db270a8SFrederic Weisbecker t->cpu = cpu; 1022db270a8SFrederic Weisbecker t->pdu_len = len; 1032db270a8SFrederic Weisbecker memcpy((void *) t + sizeof(*t), data, len); 10418cea459SLi Zefan 10518cea459SLi Zefan if (blk_tracer) 106b7f0c959SSteven Rostedt (Red Hat) trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc); 1072db270a8SFrederic Weisbecker } 1082db270a8SFrederic Weisbecker } 1092db270a8SFrederic Weisbecker 1102db270a8SFrederic Weisbecker /* 1112db270a8SFrederic Weisbecker * Send out a notify for this process, if we haven't done so since a trace 1122db270a8SFrederic Weisbecker * started 1132db270a8SFrederic Weisbecker */ 114a404d557SJan Kara static void trace_note_tsk(struct task_struct *tsk) 1152db270a8SFrederic Weisbecker { 116a404d557SJan Kara unsigned long flags; 117a404d557SJan Kara struct blk_trace *bt; 118a404d557SJan Kara 1192db270a8SFrederic Weisbecker tsk->btrace_seq = blktrace_seq; 120a404d557SJan Kara spin_lock_irqsave(&running_trace_lock, flags); 121a404d557SJan Kara list_for_each_entry(bt, &running_trace_list, running_list) { 122a404d557SJan Kara trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, 123a404d557SJan Kara sizeof(tsk->comm)); 124a404d557SJan Kara } 125a404d557SJan Kara spin_unlock_irqrestore(&running_trace_lock, flags); 1262db270a8SFrederic Weisbecker } 1272db270a8SFrederic Weisbecker 1282db270a8SFrederic Weisbecker static void trace_note_time(struct blk_trace *bt) 1292db270a8SFrederic Weisbecker { 1302db270a8SFrederic Weisbecker struct timespec now; 1312db270a8SFrederic Weisbecker unsigned long flags; 1322db270a8SFrederic Weisbecker u32 words[2]; 1332db270a8SFrederic Weisbecker 1342db270a8SFrederic Weisbecker getnstimeofday(&now); 1352db270a8SFrederic Weisbecker words[0] = now.tv_sec; 1362db270a8SFrederic Weisbecker words[1] = now.tv_nsec; 1372db270a8SFrederic Weisbecker 1382db270a8SFrederic Weisbecker local_irq_save(flags); 1392db270a8SFrederic Weisbecker trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words)); 1402db270a8SFrederic Weisbecker local_irq_restore(flags); 1412db270a8SFrederic Weisbecker } 1422db270a8SFrederic Weisbecker 1432db270a8SFrederic Weisbecker void __trace_note_message(struct blk_trace *bt, const char *fmt, ...) 1442db270a8SFrederic Weisbecker { 1452db270a8SFrederic Weisbecker int n; 1462db270a8SFrederic Weisbecker va_list args; 1472db270a8SFrederic Weisbecker unsigned long flags; 1482db270a8SFrederic Weisbecker char *buf; 1492db270a8SFrederic Weisbecker 15018cea459SLi Zefan if (unlikely(bt->trace_state != Blktrace_running && 15118cea459SLi Zefan !blk_tracer_enabled)) 1522db270a8SFrederic Weisbecker return; 1532db270a8SFrederic Weisbecker 154490da40dSTao Ma /* 155490da40dSTao Ma * If the BLK_TC_NOTIFY action mask isn't set, don't send any note 156490da40dSTao Ma * message to the trace. 157490da40dSTao Ma */ 158490da40dSTao Ma if (!(bt->act_mask & BLK_TC_NOTIFY)) 159490da40dSTao Ma return; 160490da40dSTao Ma 1612db270a8SFrederic Weisbecker local_irq_save(flags); 162d8a0349cSShan Wei buf = this_cpu_ptr(bt->msg_data); 1632db270a8SFrederic Weisbecker va_start(args, fmt); 1642db270a8SFrederic Weisbecker n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); 1652db270a8SFrederic Weisbecker va_end(args); 1662db270a8SFrederic Weisbecker 1672db270a8SFrederic Weisbecker trace_note(bt, 0, BLK_TN_MESSAGE, buf, n); 1682db270a8SFrederic Weisbecker local_irq_restore(flags); 1692db270a8SFrederic Weisbecker } 1702db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(__trace_note_message); 1712db270a8SFrederic Weisbecker 1722db270a8SFrederic Weisbecker static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, 1732db270a8SFrederic Weisbecker pid_t pid) 1742db270a8SFrederic Weisbecker { 1752db270a8SFrederic Weisbecker if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) 1762db270a8SFrederic Weisbecker return 1; 177d0deef5bSShawn Du if (sector && (sector < bt->start_lba || sector > bt->end_lba)) 1782db270a8SFrederic Weisbecker return 1; 1792db270a8SFrederic Weisbecker if (bt->pid && pid != bt->pid) 1802db270a8SFrederic Weisbecker return 1; 1812db270a8SFrederic Weisbecker 1822db270a8SFrederic Weisbecker return 0; 1832db270a8SFrederic Weisbecker } 1842db270a8SFrederic Weisbecker 1852db270a8SFrederic Weisbecker /* 1862db270a8SFrederic Weisbecker * Data direction bit lookup 1872db270a8SFrederic Weisbecker */ 188e4955c99SLi Zefan static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), 1892db270a8SFrederic Weisbecker BLK_TC_ACT(BLK_TC_WRITE) }; 1902db270a8SFrederic Weisbecker 1917b6d91daSChristoph Hellwig #define BLK_TC_RAHEAD BLK_TC_AHEAD 1927b6d91daSChristoph Hellwig 1932db270a8SFrederic Weisbecker /* The ilog2() calls fall out because they're constant */ 1947b6d91daSChristoph Hellwig #define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \ 1957b6d91daSChristoph Hellwig (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name)) 1962db270a8SFrederic Weisbecker 1972db270a8SFrederic Weisbecker /* 1982db270a8SFrederic Weisbecker * The worker for the various blk_add_trace*() types. Fills out a 1992db270a8SFrederic Weisbecker * blk_io_trace structure and places it in a per-cpu subbuffer. 2002db270a8SFrederic Weisbecker */ 2012db270a8SFrederic Weisbecker static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, 2021b9a9ab7SMike Christie int op, int op_flags, u32 what, int error, int pdu_len, 2031b9a9ab7SMike Christie void *pdu_data) 2042db270a8SFrederic Weisbecker { 2052db270a8SFrederic Weisbecker struct task_struct *tsk = current; 2062db270a8SFrederic Weisbecker struct ring_buffer_event *event = NULL; 207e77405adSSteven Rostedt struct ring_buffer *buffer = NULL; 2082db270a8SFrederic Weisbecker struct blk_io_trace *t; 2092db270a8SFrederic Weisbecker unsigned long flags = 0; 2102db270a8SFrederic Weisbecker unsigned long *sequence; 2112db270a8SFrederic Weisbecker pid_t pid; 2122db270a8SFrederic Weisbecker int cpu, pc = 0; 21318cea459SLi Zefan bool blk_tracer = blk_tracer_enabled; 2142db270a8SFrederic Weisbecker 21518cea459SLi Zefan if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) 2162db270a8SFrederic Weisbecker return; 2172db270a8SFrederic Weisbecker 2181b9a9ab7SMike Christie what |= ddir_act[op_is_write(op) ? WRITE : READ]; 2191b9a9ab7SMike Christie what |= MASK_TC_BIT(op_flags, SYNC); 2201b9a9ab7SMike Christie what |= MASK_TC_BIT(op_flags, RAHEAD); 2211b9a9ab7SMike Christie what |= MASK_TC_BIT(op_flags, META); 2221b9a9ab7SMike Christie what |= MASK_TC_BIT(op_flags, FLUSH); 2231b9a9ab7SMike Christie what |= MASK_TC_BIT(op_flags, FUA); 2241b9a9ab7SMike Christie if (op == REQ_OP_DISCARD) 2251b9a9ab7SMike Christie what |= BLK_TC_ACT(BLK_TC_DISCARD); 2263a5e02ceSMike Christie if (op == REQ_OP_FLUSH) 2273a5e02ceSMike Christie what |= BLK_TC_ACT(BLK_TC_FLUSH); 2282db270a8SFrederic Weisbecker 2292db270a8SFrederic Weisbecker pid = tsk->pid; 230d0deef5bSShawn Du if (act_log_check(bt, what, sector, pid)) 2312db270a8SFrederic Weisbecker return; 2322db270a8SFrederic Weisbecker cpu = raw_smp_processor_id(); 2332db270a8SFrederic Weisbecker 23418cea459SLi Zefan if (blk_tracer) { 2352db270a8SFrederic Weisbecker tracing_record_cmdline(current); 2362db270a8SFrederic Weisbecker 23712883efbSSteven Rostedt (Red Hat) buffer = blk_tr->trace_buffer.buffer; 2382db270a8SFrederic Weisbecker pc = preempt_count(); 239e77405adSSteven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BLK, 2402db270a8SFrederic Weisbecker sizeof(*t) + pdu_len, 2412db270a8SFrederic Weisbecker 0, pc); 2422db270a8SFrederic Weisbecker if (!event) 2432db270a8SFrederic Weisbecker return; 2442db270a8SFrederic Weisbecker t = ring_buffer_event_data(event); 2452db270a8SFrederic Weisbecker goto record_it; 2462db270a8SFrederic Weisbecker } 2472db270a8SFrederic Weisbecker 248a404d557SJan Kara if (unlikely(tsk->btrace_seq != blktrace_seq)) 249a404d557SJan Kara trace_note_tsk(tsk); 250a404d557SJan Kara 2512db270a8SFrederic Weisbecker /* 2522db270a8SFrederic Weisbecker * A word about the locking here - we disable interrupts to reserve 2532db270a8SFrederic Weisbecker * some space in the relay per-cpu buffer, to prevent an irq 2542db270a8SFrederic Weisbecker * from coming in and stepping on our toes. 2552db270a8SFrederic Weisbecker */ 2562db270a8SFrederic Weisbecker local_irq_save(flags); 2572db270a8SFrederic Weisbecker t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len); 2582db270a8SFrederic Weisbecker if (t) { 2592db270a8SFrederic Weisbecker sequence = per_cpu_ptr(bt->sequence, cpu); 2602db270a8SFrederic Weisbecker 2612db270a8SFrederic Weisbecker t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 2622db270a8SFrederic Weisbecker t->sequence = ++(*sequence); 2632db270a8SFrederic Weisbecker t->time = ktime_to_ns(ktime_get()); 2642db270a8SFrederic Weisbecker record_it: 2652db270a8SFrederic Weisbecker /* 2662db270a8SFrederic Weisbecker * These two are not needed in ftrace as they are in the 2672db270a8SFrederic Weisbecker * generic trace_entry, filled by tracing_generic_entry_update, 2682db270a8SFrederic Weisbecker * but for the trace_event->bin() synthesizer benefit we do it 2692db270a8SFrederic Weisbecker * here too. 2702db270a8SFrederic Weisbecker */ 2712db270a8SFrederic Weisbecker t->cpu = cpu; 2722db270a8SFrederic Weisbecker t->pid = pid; 2732db270a8SFrederic Weisbecker 2742db270a8SFrederic Weisbecker t->sector = sector; 2752db270a8SFrederic Weisbecker t->bytes = bytes; 2762db270a8SFrederic Weisbecker t->action = what; 2772db270a8SFrederic Weisbecker t->device = bt->dev; 2782db270a8SFrederic Weisbecker t->error = error; 2792db270a8SFrederic Weisbecker t->pdu_len = pdu_len; 2802db270a8SFrederic Weisbecker 2812db270a8SFrederic Weisbecker if (pdu_len) 2822db270a8SFrederic Weisbecker memcpy((void *) t + sizeof(*t), pdu_data, pdu_len); 2832db270a8SFrederic Weisbecker 28418cea459SLi Zefan if (blk_tracer) { 285b7f0c959SSteven Rostedt (Red Hat) trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc); 2862db270a8SFrederic Weisbecker return; 2872db270a8SFrederic Weisbecker } 2882db270a8SFrederic Weisbecker } 2892db270a8SFrederic Weisbecker 2902db270a8SFrederic Weisbecker local_irq_restore(flags); 2912db270a8SFrederic Weisbecker } 2922db270a8SFrederic Weisbecker 2932db270a8SFrederic Weisbecker static struct dentry *blk_tree_root; 2942db270a8SFrederic Weisbecker static DEFINE_MUTEX(blk_tree_mutex); 2952db270a8SFrederic Weisbecker 296ad5dd549SLi Zefan static void blk_trace_free(struct blk_trace *bt) 2972db270a8SFrederic Weisbecker { 2982db270a8SFrederic Weisbecker debugfs_remove(bt->msg_file); 2992db270a8SFrederic Weisbecker debugfs_remove(bt->dropped_file); 3002db270a8SFrederic Weisbecker relay_close(bt->rchan); 30139cbb602SAlan D. Brunelle debugfs_remove(bt->dir); 3022db270a8SFrederic Weisbecker free_percpu(bt->sequence); 3032db270a8SFrederic Weisbecker free_percpu(bt->msg_data); 3042db270a8SFrederic Weisbecker kfree(bt); 305ad5dd549SLi Zefan } 306ad5dd549SLi Zefan 307ad5dd549SLi Zefan static void blk_trace_cleanup(struct blk_trace *bt) 308ad5dd549SLi Zefan { 309ad5dd549SLi Zefan blk_trace_free(bt); 3102db270a8SFrederic Weisbecker if (atomic_dec_and_test(&blk_probes_ref)) 3112db270a8SFrederic Weisbecker blk_unregister_tracepoints(); 3122db270a8SFrederic Weisbecker } 3132db270a8SFrederic Weisbecker 3142db270a8SFrederic Weisbecker int blk_trace_remove(struct request_queue *q) 3152db270a8SFrederic Weisbecker { 3162db270a8SFrederic Weisbecker struct blk_trace *bt; 3172db270a8SFrederic Weisbecker 3182db270a8SFrederic Weisbecker bt = xchg(&q->blk_trace, NULL); 3192db270a8SFrederic Weisbecker if (!bt) 3202db270a8SFrederic Weisbecker return -EINVAL; 3212db270a8SFrederic Weisbecker 32255547204SLi Zefan if (bt->trace_state != Blktrace_running) 3232db270a8SFrederic Weisbecker blk_trace_cleanup(bt); 3242db270a8SFrederic Weisbecker 3252db270a8SFrederic Weisbecker return 0; 3262db270a8SFrederic Weisbecker } 3272db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_remove); 3282db270a8SFrederic Weisbecker 3292db270a8SFrederic Weisbecker static ssize_t blk_dropped_read(struct file *filp, char __user *buffer, 3302db270a8SFrederic Weisbecker size_t count, loff_t *ppos) 3312db270a8SFrederic Weisbecker { 3322db270a8SFrederic Weisbecker struct blk_trace *bt = filp->private_data; 3332db270a8SFrederic Weisbecker char buf[16]; 3342db270a8SFrederic Weisbecker 3352db270a8SFrederic Weisbecker snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); 3362db270a8SFrederic Weisbecker 3372db270a8SFrederic Weisbecker return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 3382db270a8SFrederic Weisbecker } 3392db270a8SFrederic Weisbecker 3402db270a8SFrederic Weisbecker static const struct file_operations blk_dropped_fops = { 3412db270a8SFrederic Weisbecker .owner = THIS_MODULE, 342234e3405SStephen Boyd .open = simple_open, 3432db270a8SFrederic Weisbecker .read = blk_dropped_read, 3446038f373SArnd Bergmann .llseek = default_llseek, 3452db270a8SFrederic Weisbecker }; 3462db270a8SFrederic Weisbecker 3472db270a8SFrederic Weisbecker static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, 3482db270a8SFrederic Weisbecker size_t count, loff_t *ppos) 3492db270a8SFrederic Weisbecker { 3502db270a8SFrederic Weisbecker char *msg; 3512db270a8SFrederic Weisbecker struct blk_trace *bt; 3522db270a8SFrederic Weisbecker 3537635b03aSLi Zefan if (count >= BLK_TN_MAX_MSG) 3542db270a8SFrederic Weisbecker return -EINVAL; 3552db270a8SFrederic Weisbecker 35616e5c1fcSAl Viro msg = memdup_user_nul(buffer, count); 35716e5c1fcSAl Viro if (IS_ERR(msg)) 35816e5c1fcSAl Viro return PTR_ERR(msg); 3592db270a8SFrederic Weisbecker 3602db270a8SFrederic Weisbecker bt = filp->private_data; 3612db270a8SFrederic Weisbecker __trace_note_message(bt, "%s", msg); 3622db270a8SFrederic Weisbecker kfree(msg); 3632db270a8SFrederic Weisbecker 3642db270a8SFrederic Weisbecker return count; 3652db270a8SFrederic Weisbecker } 3662db270a8SFrederic Weisbecker 3672db270a8SFrederic Weisbecker static const struct file_operations blk_msg_fops = { 3682db270a8SFrederic Weisbecker .owner = THIS_MODULE, 369234e3405SStephen Boyd .open = simple_open, 3702db270a8SFrederic Weisbecker .write = blk_msg_write, 3716038f373SArnd Bergmann .llseek = noop_llseek, 3722db270a8SFrederic Weisbecker }; 3732db270a8SFrederic Weisbecker 3742db270a8SFrederic Weisbecker /* 3752db270a8SFrederic Weisbecker * Keep track of how many times we encountered a full subbuffer, to aid 3762db270a8SFrederic Weisbecker * the user space app in telling how many lost events there were. 3772db270a8SFrederic Weisbecker */ 3782db270a8SFrederic Weisbecker static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, 3792db270a8SFrederic Weisbecker void *prev_subbuf, size_t prev_padding) 3802db270a8SFrederic Weisbecker { 3812db270a8SFrederic Weisbecker struct blk_trace *bt; 3822db270a8SFrederic Weisbecker 3832db270a8SFrederic Weisbecker if (!relay_buf_full(buf)) 3842db270a8SFrederic Weisbecker return 1; 3852db270a8SFrederic Weisbecker 3862db270a8SFrederic Weisbecker bt = buf->chan->private_data; 3872db270a8SFrederic Weisbecker atomic_inc(&bt->dropped); 3882db270a8SFrederic Weisbecker return 0; 3892db270a8SFrederic Weisbecker } 3902db270a8SFrederic Weisbecker 3912db270a8SFrederic Weisbecker static int blk_remove_buf_file_callback(struct dentry *dentry) 3922db270a8SFrederic Weisbecker { 3932db270a8SFrederic Weisbecker debugfs_remove(dentry); 3942db270a8SFrederic Weisbecker 3952db270a8SFrederic Weisbecker return 0; 3962db270a8SFrederic Weisbecker } 3972db270a8SFrederic Weisbecker 3982db270a8SFrederic Weisbecker static struct dentry *blk_create_buf_file_callback(const char *filename, 3992db270a8SFrederic Weisbecker struct dentry *parent, 400f4ae40a6SAl Viro umode_t mode, 4012db270a8SFrederic Weisbecker struct rchan_buf *buf, 4022db270a8SFrederic Weisbecker int *is_global) 4032db270a8SFrederic Weisbecker { 4042db270a8SFrederic Weisbecker return debugfs_create_file(filename, mode, parent, buf, 4052db270a8SFrederic Weisbecker &relay_file_operations); 4062db270a8SFrederic Weisbecker } 4072db270a8SFrederic Weisbecker 4082db270a8SFrederic Weisbecker static struct rchan_callbacks blk_relay_callbacks = { 4092db270a8SFrederic Weisbecker .subbuf_start = blk_subbuf_start_callback, 4102db270a8SFrederic Weisbecker .create_buf_file = blk_create_buf_file_callback, 4112db270a8SFrederic Weisbecker .remove_buf_file = blk_remove_buf_file_callback, 4122db270a8SFrederic Weisbecker }; 4132db270a8SFrederic Weisbecker 4149908c309SLi Zefan static void blk_trace_setup_lba(struct blk_trace *bt, 4159908c309SLi Zefan struct block_device *bdev) 4169908c309SLi Zefan { 4179908c309SLi Zefan struct hd_struct *part = NULL; 4189908c309SLi Zefan 4199908c309SLi Zefan if (bdev) 4209908c309SLi Zefan part = bdev->bd_part; 4219908c309SLi Zefan 4229908c309SLi Zefan if (part) { 4239908c309SLi Zefan bt->start_lba = part->start_sect; 4249908c309SLi Zefan bt->end_lba = part->start_sect + part->nr_sects; 4259908c309SLi Zefan } else { 4269908c309SLi Zefan bt->start_lba = 0; 4279908c309SLi Zefan bt->end_lba = -1ULL; 4289908c309SLi Zefan } 4299908c309SLi Zefan } 4309908c309SLi Zefan 4312db270a8SFrederic Weisbecker /* 4322db270a8SFrederic Weisbecker * Setup everything required to start tracing 4332db270a8SFrederic Weisbecker */ 4342db270a8SFrederic Weisbecker int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 435d0deef5bSShawn Du struct block_device *bdev, 4362db270a8SFrederic Weisbecker struct blk_user_trace_setup *buts) 4372db270a8SFrederic Weisbecker { 438cdea01b2SDavidlohr Bueso struct blk_trace *bt = NULL; 4392db270a8SFrederic Weisbecker struct dentry *dir = NULL; 440ff14417cSRasmus Villemoes int ret; 4412db270a8SFrederic Weisbecker 4422db270a8SFrederic Weisbecker if (!buts->buf_size || !buts->buf_nr) 4432db270a8SFrederic Weisbecker return -EINVAL; 4442db270a8SFrederic Weisbecker 4452db270a8SFrederic Weisbecker strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); 4462db270a8SFrederic Weisbecker buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; 4472db270a8SFrederic Weisbecker 4482db270a8SFrederic Weisbecker /* 4492db270a8SFrederic Weisbecker * some device names have larger paths - convert the slashes 4502db270a8SFrederic Weisbecker * to underscores for this to work as expected 4512db270a8SFrederic Weisbecker */ 452ff14417cSRasmus Villemoes strreplace(buts->name, '/', '_'); 4532db270a8SFrederic Weisbecker 4542db270a8SFrederic Weisbecker bt = kzalloc(sizeof(*bt), GFP_KERNEL); 4552db270a8SFrederic Weisbecker if (!bt) 456ad5dd549SLi Zefan return -ENOMEM; 4572db270a8SFrederic Weisbecker 458ad5dd549SLi Zefan ret = -ENOMEM; 4592db270a8SFrederic Weisbecker bt->sequence = alloc_percpu(unsigned long); 4602db270a8SFrederic Weisbecker if (!bt->sequence) 4612db270a8SFrederic Weisbecker goto err; 4622db270a8SFrederic Weisbecker 463f0ef0398SIngo Molnar bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 4642db270a8SFrederic Weisbecker if (!bt->msg_data) 4652db270a8SFrederic Weisbecker goto err; 4662db270a8SFrederic Weisbecker 4672db270a8SFrederic Weisbecker ret = -ENOENT; 4682db270a8SFrederic Weisbecker 469b5230b56SLi Zefan mutex_lock(&blk_tree_mutex); 4702db270a8SFrederic Weisbecker if (!blk_tree_root) { 4712db270a8SFrederic Weisbecker blk_tree_root = debugfs_create_dir("block", NULL); 472b5230b56SLi Zefan if (!blk_tree_root) { 473b5230b56SLi Zefan mutex_unlock(&blk_tree_mutex); 4741a17662eSLi Zefan goto err; 4752db270a8SFrederic Weisbecker } 476b5230b56SLi Zefan } 477b5230b56SLi Zefan mutex_unlock(&blk_tree_mutex); 4782db270a8SFrederic Weisbecker 4792db270a8SFrederic Weisbecker dir = debugfs_create_dir(buts->name, blk_tree_root); 4802db270a8SFrederic Weisbecker 4812db270a8SFrederic Weisbecker if (!dir) 4822db270a8SFrederic Weisbecker goto err; 4832db270a8SFrederic Weisbecker 4842db270a8SFrederic Weisbecker bt->dir = dir; 4852db270a8SFrederic Weisbecker bt->dev = dev; 4862db270a8SFrederic Weisbecker atomic_set(&bt->dropped, 0); 487a404d557SJan Kara INIT_LIST_HEAD(&bt->running_list); 4882db270a8SFrederic Weisbecker 4892db270a8SFrederic Weisbecker ret = -EIO; 4902db270a8SFrederic Weisbecker bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, 4912db270a8SFrederic Weisbecker &blk_dropped_fops); 4922db270a8SFrederic Weisbecker if (!bt->dropped_file) 4932db270a8SFrederic Weisbecker goto err; 4942db270a8SFrederic Weisbecker 4952db270a8SFrederic Weisbecker bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); 4962db270a8SFrederic Weisbecker if (!bt->msg_file) 4972db270a8SFrederic Weisbecker goto err; 4982db270a8SFrederic Weisbecker 4992db270a8SFrederic Weisbecker bt->rchan = relay_open("trace", dir, buts->buf_size, 5002db270a8SFrederic Weisbecker buts->buf_nr, &blk_relay_callbacks, bt); 5012db270a8SFrederic Weisbecker if (!bt->rchan) 5022db270a8SFrederic Weisbecker goto err; 5032db270a8SFrederic Weisbecker 5042db270a8SFrederic Weisbecker bt->act_mask = buts->act_mask; 5052db270a8SFrederic Weisbecker if (!bt->act_mask) 5062db270a8SFrederic Weisbecker bt->act_mask = (u16) -1; 5072db270a8SFrederic Weisbecker 5089908c309SLi Zefan blk_trace_setup_lba(bt, bdev); 5092db270a8SFrederic Weisbecker 510d0deef5bSShawn Du /* overwrite with user settings */ 511d0deef5bSShawn Du if (buts->start_lba) 512d0deef5bSShawn Du bt->start_lba = buts->start_lba; 513d0deef5bSShawn Du if (buts->end_lba) 514d0deef5bSShawn Du bt->end_lba = buts->end_lba; 515d0deef5bSShawn Du 5162db270a8SFrederic Weisbecker bt->pid = buts->pid; 5172db270a8SFrederic Weisbecker bt->trace_state = Blktrace_setup; 5182db270a8SFrederic Weisbecker 5192db270a8SFrederic Weisbecker ret = -EBUSY; 520cdea01b2SDavidlohr Bueso if (cmpxchg(&q->blk_trace, NULL, bt)) 5212db270a8SFrederic Weisbecker goto err; 5222db270a8SFrederic Weisbecker 52317ba97e3SLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 524cbe28296SLi Zefan blk_register_tracepoints(); 525cbe28296SLi Zefan 5262db270a8SFrederic Weisbecker return 0; 5272db270a8SFrederic Weisbecker err: 528ad5dd549SLi Zefan blk_trace_free(bt); 5292db270a8SFrederic Weisbecker return ret; 5302db270a8SFrederic Weisbecker } 5312db270a8SFrederic Weisbecker 5322db270a8SFrederic Weisbecker int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 533d0deef5bSShawn Du struct block_device *bdev, 5342db270a8SFrederic Weisbecker char __user *arg) 5352db270a8SFrederic Weisbecker { 5362db270a8SFrederic Weisbecker struct blk_user_trace_setup buts; 5372db270a8SFrederic Weisbecker int ret; 5382db270a8SFrederic Weisbecker 5392db270a8SFrederic Weisbecker ret = copy_from_user(&buts, arg, sizeof(buts)); 5402db270a8SFrederic Weisbecker if (ret) 5412db270a8SFrederic Weisbecker return -EFAULT; 5422db270a8SFrederic Weisbecker 543d0deef5bSShawn Du ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 5442db270a8SFrederic Weisbecker if (ret) 5452db270a8SFrederic Weisbecker return ret; 5462db270a8SFrederic Weisbecker 5479a8c28c8SDmitry Monakhov if (copy_to_user(arg, &buts, sizeof(buts))) { 5489a8c28c8SDmitry Monakhov blk_trace_remove(q); 5492db270a8SFrederic Weisbecker return -EFAULT; 5509a8c28c8SDmitry Monakhov } 5512db270a8SFrederic Weisbecker return 0; 5522db270a8SFrederic Weisbecker } 5532db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_setup); 5542db270a8SFrederic Weisbecker 55562c2a7d9SArnd Bergmann #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 55662c2a7d9SArnd Bergmann static int compat_blk_trace_setup(struct request_queue *q, char *name, 55762c2a7d9SArnd Bergmann dev_t dev, struct block_device *bdev, 55862c2a7d9SArnd Bergmann char __user *arg) 55962c2a7d9SArnd Bergmann { 56062c2a7d9SArnd Bergmann struct blk_user_trace_setup buts; 56162c2a7d9SArnd Bergmann struct compat_blk_user_trace_setup cbuts; 56262c2a7d9SArnd Bergmann int ret; 56362c2a7d9SArnd Bergmann 56462c2a7d9SArnd Bergmann if (copy_from_user(&cbuts, arg, sizeof(cbuts))) 56562c2a7d9SArnd Bergmann return -EFAULT; 56662c2a7d9SArnd Bergmann 56762c2a7d9SArnd Bergmann buts = (struct blk_user_trace_setup) { 56862c2a7d9SArnd Bergmann .act_mask = cbuts.act_mask, 56962c2a7d9SArnd Bergmann .buf_size = cbuts.buf_size, 57062c2a7d9SArnd Bergmann .buf_nr = cbuts.buf_nr, 57162c2a7d9SArnd Bergmann .start_lba = cbuts.start_lba, 57262c2a7d9SArnd Bergmann .end_lba = cbuts.end_lba, 57362c2a7d9SArnd Bergmann .pid = cbuts.pid, 57462c2a7d9SArnd Bergmann }; 57562c2a7d9SArnd Bergmann 57662c2a7d9SArnd Bergmann ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 57762c2a7d9SArnd Bergmann if (ret) 57862c2a7d9SArnd Bergmann return ret; 57962c2a7d9SArnd Bergmann 580f8c5e944SChen Gang if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) { 58162c2a7d9SArnd Bergmann blk_trace_remove(q); 58262c2a7d9SArnd Bergmann return -EFAULT; 58362c2a7d9SArnd Bergmann } 58462c2a7d9SArnd Bergmann 58562c2a7d9SArnd Bergmann return 0; 58662c2a7d9SArnd Bergmann } 58762c2a7d9SArnd Bergmann #endif 58862c2a7d9SArnd Bergmann 5892db270a8SFrederic Weisbecker int blk_trace_startstop(struct request_queue *q, int start) 5902db270a8SFrederic Weisbecker { 5912db270a8SFrederic Weisbecker int ret; 5922db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 5932db270a8SFrederic Weisbecker 5942db270a8SFrederic Weisbecker if (bt == NULL) 5952db270a8SFrederic Weisbecker return -EINVAL; 5962db270a8SFrederic Weisbecker 5972db270a8SFrederic Weisbecker /* 5982db270a8SFrederic Weisbecker * For starting a trace, we can transition from a setup or stopped 5992db270a8SFrederic Weisbecker * trace. For stopping a trace, the state must be running 6002db270a8SFrederic Weisbecker */ 6012db270a8SFrederic Weisbecker ret = -EINVAL; 6022db270a8SFrederic Weisbecker if (start) { 6032db270a8SFrederic Weisbecker if (bt->trace_state == Blktrace_setup || 6042db270a8SFrederic Weisbecker bt->trace_state == Blktrace_stopped) { 6052db270a8SFrederic Weisbecker blktrace_seq++; 6062db270a8SFrederic Weisbecker smp_mb(); 6072db270a8SFrederic Weisbecker bt->trace_state = Blktrace_running; 608a404d557SJan Kara spin_lock_irq(&running_trace_lock); 609a404d557SJan Kara list_add(&bt->running_list, &running_trace_list); 610a404d557SJan Kara spin_unlock_irq(&running_trace_lock); 6112db270a8SFrederic Weisbecker 6122db270a8SFrederic Weisbecker trace_note_time(bt); 6132db270a8SFrederic Weisbecker ret = 0; 6142db270a8SFrederic Weisbecker } 6152db270a8SFrederic Weisbecker } else { 6162db270a8SFrederic Weisbecker if (bt->trace_state == Blktrace_running) { 6172db270a8SFrederic Weisbecker bt->trace_state = Blktrace_stopped; 618a404d557SJan Kara spin_lock_irq(&running_trace_lock); 619a404d557SJan Kara list_del_init(&bt->running_list); 620a404d557SJan Kara spin_unlock_irq(&running_trace_lock); 6212db270a8SFrederic Weisbecker relay_flush(bt->rchan); 6222db270a8SFrederic Weisbecker ret = 0; 6232db270a8SFrederic Weisbecker } 6242db270a8SFrederic Weisbecker } 6252db270a8SFrederic Weisbecker 6262db270a8SFrederic Weisbecker return ret; 6272db270a8SFrederic Weisbecker } 6282db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_startstop); 6292db270a8SFrederic Weisbecker 6302db270a8SFrederic Weisbecker /** 6312db270a8SFrederic Weisbecker * blk_trace_ioctl: - handle the ioctls associated with tracing 6322db270a8SFrederic Weisbecker * @bdev: the block device 6332db270a8SFrederic Weisbecker * @cmd: the ioctl cmd 6342db270a8SFrederic Weisbecker * @arg: the argument data, if any 6352db270a8SFrederic Weisbecker * 6362db270a8SFrederic Weisbecker **/ 6372db270a8SFrederic Weisbecker int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) 6382db270a8SFrederic Weisbecker { 6392db270a8SFrederic Weisbecker struct request_queue *q; 6402db270a8SFrederic Weisbecker int ret, start = 0; 6412db270a8SFrederic Weisbecker char b[BDEVNAME_SIZE]; 6422db270a8SFrederic Weisbecker 6432db270a8SFrederic Weisbecker q = bdev_get_queue(bdev); 6442db270a8SFrederic Weisbecker if (!q) 6452db270a8SFrederic Weisbecker return -ENXIO; 6462db270a8SFrederic Weisbecker 6472db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 6482db270a8SFrederic Weisbecker 6492db270a8SFrederic Weisbecker switch (cmd) { 6502db270a8SFrederic Weisbecker case BLKTRACESETUP: 6512db270a8SFrederic Weisbecker bdevname(bdev, b); 652d0deef5bSShawn Du ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 6532db270a8SFrederic Weisbecker break; 65462c2a7d9SArnd Bergmann #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 65562c2a7d9SArnd Bergmann case BLKTRACESETUP32: 65662c2a7d9SArnd Bergmann bdevname(bdev, b); 65762c2a7d9SArnd Bergmann ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 65862c2a7d9SArnd Bergmann break; 65962c2a7d9SArnd Bergmann #endif 6602db270a8SFrederic Weisbecker case BLKTRACESTART: 6612db270a8SFrederic Weisbecker start = 1; 6622db270a8SFrederic Weisbecker case BLKTRACESTOP: 6632db270a8SFrederic Weisbecker ret = blk_trace_startstop(q, start); 6642db270a8SFrederic Weisbecker break; 6652db270a8SFrederic Weisbecker case BLKTRACETEARDOWN: 6662db270a8SFrederic Weisbecker ret = blk_trace_remove(q); 6672db270a8SFrederic Weisbecker break; 6682db270a8SFrederic Weisbecker default: 6692db270a8SFrederic Weisbecker ret = -ENOTTY; 6702db270a8SFrederic Weisbecker break; 6712db270a8SFrederic Weisbecker } 6722db270a8SFrederic Weisbecker 6732db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 6742db270a8SFrederic Weisbecker return ret; 6752db270a8SFrederic Weisbecker } 6762db270a8SFrederic Weisbecker 6772db270a8SFrederic Weisbecker /** 6782db270a8SFrederic Weisbecker * blk_trace_shutdown: - stop and cleanup trace structures 6792db270a8SFrederic Weisbecker * @q: the request queue associated with the device 6802db270a8SFrederic Weisbecker * 6812db270a8SFrederic Weisbecker **/ 6822db270a8SFrederic Weisbecker void blk_trace_shutdown(struct request_queue *q) 6832db270a8SFrederic Weisbecker { 6842db270a8SFrederic Weisbecker if (q->blk_trace) { 6852db270a8SFrederic Weisbecker blk_trace_startstop(q, 0); 6862db270a8SFrederic Weisbecker blk_trace_remove(q); 6872db270a8SFrederic Weisbecker } 6882db270a8SFrederic Weisbecker } 6892db270a8SFrederic Weisbecker 6902db270a8SFrederic Weisbecker /* 6912db270a8SFrederic Weisbecker * blktrace probes 6922db270a8SFrederic Weisbecker */ 6932db270a8SFrederic Weisbecker 6942db270a8SFrederic Weisbecker /** 6952db270a8SFrederic Weisbecker * blk_add_trace_rq - Add a trace for a request oriented action 6962db270a8SFrederic Weisbecker * @q: queue the io is for 6972db270a8SFrederic Weisbecker * @rq: the source request 698af5040daSRoman Pen * @nr_bytes: number of completed bytes 6992db270a8SFrederic Weisbecker * @what: the action 7002db270a8SFrederic Weisbecker * 7012db270a8SFrederic Weisbecker * Description: 7022db270a8SFrederic Weisbecker * Records an action against a request. Will log the bio offset + size. 7032db270a8SFrederic Weisbecker * 7042db270a8SFrederic Weisbecker **/ 7052db270a8SFrederic Weisbecker static void blk_add_trace_rq(struct request_queue *q, struct request *rq, 706af5040daSRoman Pen unsigned int nr_bytes, u32 what) 7072db270a8SFrederic Weisbecker { 7082db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7092db270a8SFrederic Weisbecker 7102db270a8SFrederic Weisbecker if (likely(!bt)) 7112db270a8SFrederic Weisbecker return; 7122db270a8SFrederic Weisbecker 71333659ebbSChristoph Hellwig if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 7142db270a8SFrederic Weisbecker what |= BLK_TC_ACT(BLK_TC_PC); 7151b9a9ab7SMike Christie __blk_add_trace(bt, 0, nr_bytes, req_op(rq), rq->cmd_flags, 7162e46e8b2STejun Heo what, rq->errors, rq->cmd_len, rq->cmd); 7172db270a8SFrederic Weisbecker } else { 7182db270a8SFrederic Weisbecker what |= BLK_TC_ACT(BLK_TC_FS); 7191b9a9ab7SMike Christie __blk_add_trace(bt, blk_rq_pos(rq), nr_bytes, req_op(rq), 720805f6b5eSTao Ma rq->cmd_flags, what, rq->errors, 0, NULL); 7212db270a8SFrederic Weisbecker } 7222db270a8SFrederic Weisbecker } 7232db270a8SFrederic Weisbecker 72438516ab5SSteven Rostedt static void blk_add_trace_rq_abort(void *ignore, 72538516ab5SSteven Rostedt struct request_queue *q, struct request *rq) 7262db270a8SFrederic Weisbecker { 727af5040daSRoman Pen blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_ABORT); 7282db270a8SFrederic Weisbecker } 7292db270a8SFrederic Weisbecker 73038516ab5SSteven Rostedt static void blk_add_trace_rq_insert(void *ignore, 73138516ab5SSteven Rostedt struct request_queue *q, struct request *rq) 7322db270a8SFrederic Weisbecker { 733af5040daSRoman Pen blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_INSERT); 7342db270a8SFrederic Weisbecker } 7352db270a8SFrederic Weisbecker 73638516ab5SSteven Rostedt static void blk_add_trace_rq_issue(void *ignore, 73738516ab5SSteven Rostedt struct request_queue *q, struct request *rq) 7382db270a8SFrederic Weisbecker { 739af5040daSRoman Pen blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_ISSUE); 7402db270a8SFrederic Weisbecker } 7412db270a8SFrederic Weisbecker 74238516ab5SSteven Rostedt static void blk_add_trace_rq_requeue(void *ignore, 74338516ab5SSteven Rostedt struct request_queue *q, 7442db270a8SFrederic Weisbecker struct request *rq) 7452db270a8SFrederic Weisbecker { 746af5040daSRoman Pen blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_REQUEUE); 7472db270a8SFrederic Weisbecker } 7482db270a8SFrederic Weisbecker 74938516ab5SSteven Rostedt static void blk_add_trace_rq_complete(void *ignore, 75038516ab5SSteven Rostedt struct request_queue *q, 751af5040daSRoman Pen struct request *rq, 752af5040daSRoman Pen unsigned int nr_bytes) 7532db270a8SFrederic Weisbecker { 754af5040daSRoman Pen blk_add_trace_rq(q, rq, nr_bytes, BLK_TA_COMPLETE); 7552db270a8SFrederic Weisbecker } 7562db270a8SFrederic Weisbecker 7572db270a8SFrederic Weisbecker /** 7582db270a8SFrederic Weisbecker * blk_add_trace_bio - Add a trace for a bio oriented action 7592db270a8SFrederic Weisbecker * @q: queue the io is for 7602db270a8SFrederic Weisbecker * @bio: the source bio 7612db270a8SFrederic Weisbecker * @what: the action 762797a455dSJens Axboe * @error: error, if any 7632db270a8SFrederic Weisbecker * 7642db270a8SFrederic Weisbecker * Description: 7652db270a8SFrederic Weisbecker * Records an action against a bio. Will log the bio offset + size. 7662db270a8SFrederic Weisbecker * 7672db270a8SFrederic Weisbecker **/ 7682db270a8SFrederic Weisbecker static void blk_add_trace_bio(struct request_queue *q, struct bio *bio, 769797a455dSJens Axboe u32 what, int error) 7702db270a8SFrederic Weisbecker { 7712db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7722db270a8SFrederic Weisbecker 7732db270a8SFrederic Weisbecker if (likely(!bt)) 7742db270a8SFrederic Weisbecker return; 7752db270a8SFrederic Weisbecker 7764f024f37SKent Overstreet __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, 7771b9a9ab7SMike Christie bio_op(bio), bio->bi_rw, what, error, 0, NULL); 7782db270a8SFrederic Weisbecker } 7792db270a8SFrederic Weisbecker 78038516ab5SSteven Rostedt static void blk_add_trace_bio_bounce(void *ignore, 78138516ab5SSteven Rostedt struct request_queue *q, struct bio *bio) 7822db270a8SFrederic Weisbecker { 783797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0); 7842db270a8SFrederic Weisbecker } 7852db270a8SFrederic Weisbecker 7860a82a8d1SLinus Torvalds static void blk_add_trace_bio_complete(void *ignore, 7870a82a8d1SLinus Torvalds struct request_queue *q, struct bio *bio, 7880a82a8d1SLinus Torvalds int error) 7892db270a8SFrederic Weisbecker { 790797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error); 7912db270a8SFrederic Weisbecker } 7922db270a8SFrederic Weisbecker 79338516ab5SSteven Rostedt static void blk_add_trace_bio_backmerge(void *ignore, 79438516ab5SSteven Rostedt struct request_queue *q, 7958c1cf6bbSTejun Heo struct request *rq, 7962db270a8SFrederic Weisbecker struct bio *bio) 7972db270a8SFrederic Weisbecker { 798797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0); 7992db270a8SFrederic Weisbecker } 8002db270a8SFrederic Weisbecker 80138516ab5SSteven Rostedt static void blk_add_trace_bio_frontmerge(void *ignore, 80238516ab5SSteven Rostedt struct request_queue *q, 8038c1cf6bbSTejun Heo struct request *rq, 8042db270a8SFrederic Weisbecker struct bio *bio) 8052db270a8SFrederic Weisbecker { 806797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0); 8072db270a8SFrederic Weisbecker } 8082db270a8SFrederic Weisbecker 80938516ab5SSteven Rostedt static void blk_add_trace_bio_queue(void *ignore, 81038516ab5SSteven Rostedt struct request_queue *q, struct bio *bio) 8112db270a8SFrederic Weisbecker { 812797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0); 8132db270a8SFrederic Weisbecker } 8142db270a8SFrederic Weisbecker 81538516ab5SSteven Rostedt static void blk_add_trace_getrq(void *ignore, 81638516ab5SSteven Rostedt struct request_queue *q, 8172db270a8SFrederic Weisbecker struct bio *bio, int rw) 8182db270a8SFrederic Weisbecker { 8192db270a8SFrederic Weisbecker if (bio) 820797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0); 8212db270a8SFrederic Weisbecker else { 8222db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8232db270a8SFrederic Weisbecker 8242db270a8SFrederic Weisbecker if (bt) 8251b9a9ab7SMike Christie __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_GETRQ, 0, 0, 8261b9a9ab7SMike Christie NULL); 8272db270a8SFrederic Weisbecker } 8282db270a8SFrederic Weisbecker } 8292db270a8SFrederic Weisbecker 8302db270a8SFrederic Weisbecker 83138516ab5SSteven Rostedt static void blk_add_trace_sleeprq(void *ignore, 83238516ab5SSteven Rostedt struct request_queue *q, 8332db270a8SFrederic Weisbecker struct bio *bio, int rw) 8342db270a8SFrederic Weisbecker { 8352db270a8SFrederic Weisbecker if (bio) 836797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0); 8372db270a8SFrederic Weisbecker else { 8382db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8392db270a8SFrederic Weisbecker 8402db270a8SFrederic Weisbecker if (bt) 8411b9a9ab7SMike Christie __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_SLEEPRQ, 8422db270a8SFrederic Weisbecker 0, 0, NULL); 8432db270a8SFrederic Weisbecker } 8442db270a8SFrederic Weisbecker } 8452db270a8SFrederic Weisbecker 84638516ab5SSteven Rostedt static void blk_add_trace_plug(void *ignore, struct request_queue *q) 8472db270a8SFrederic Weisbecker { 8482db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8492db270a8SFrederic Weisbecker 8502db270a8SFrederic Weisbecker if (bt) 8511b9a9ab7SMike Christie __blk_add_trace(bt, 0, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL); 8522db270a8SFrederic Weisbecker } 8532db270a8SFrederic Weisbecker 85449cac01eSJens Axboe static void blk_add_trace_unplug(void *ignore, struct request_queue *q, 85549cac01eSJens Axboe unsigned int depth, bool explicit) 8562db270a8SFrederic Weisbecker { 8572db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8582db270a8SFrederic Weisbecker 8592db270a8SFrederic Weisbecker if (bt) { 86094b5eb28SJens Axboe __be64 rpdu = cpu_to_be64(depth); 86149cac01eSJens Axboe u32 what; 8622db270a8SFrederic Weisbecker 86349cac01eSJens Axboe if (explicit) 86449cac01eSJens Axboe what = BLK_TA_UNPLUG_IO; 86549cac01eSJens Axboe else 86649cac01eSJens Axboe what = BLK_TA_UNPLUG_TIMER; 86749cac01eSJens Axboe 8681b9a9ab7SMike Christie __blk_add_trace(bt, 0, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu); 8692db270a8SFrederic Weisbecker } 8702db270a8SFrederic Weisbecker } 8712db270a8SFrederic Weisbecker 87238516ab5SSteven Rostedt static void blk_add_trace_split(void *ignore, 87338516ab5SSteven Rostedt struct request_queue *q, struct bio *bio, 8742db270a8SFrederic Weisbecker unsigned int pdu) 8752db270a8SFrederic Weisbecker { 8762db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8772db270a8SFrederic Weisbecker 8782db270a8SFrederic Weisbecker if (bt) { 8792db270a8SFrederic Weisbecker __be64 rpdu = cpu_to_be64(pdu); 8802db270a8SFrederic Weisbecker 8814f024f37SKent Overstreet __blk_add_trace(bt, bio->bi_iter.bi_sector, 8821b9a9ab7SMike Christie bio->bi_iter.bi_size, bio_op(bio), bio->bi_rw, 8831b9a9ab7SMike Christie BLK_TA_SPLIT, bio->bi_error, sizeof(rpdu), 8841b9a9ab7SMike Christie &rpdu); 8852db270a8SFrederic Weisbecker } 8862db270a8SFrederic Weisbecker } 8872db270a8SFrederic Weisbecker 8882db270a8SFrederic Weisbecker /** 889d07335e5SMike Snitzer * blk_add_trace_bio_remap - Add a trace for a bio-remap operation 890546cf44aSRandy Dunlap * @ignore: trace callback data parameter (not used) 8912db270a8SFrederic Weisbecker * @q: queue the io is for 8922db270a8SFrederic Weisbecker * @bio: the source bio 8932db270a8SFrederic Weisbecker * @dev: target device 894a42aaa3bSAlan D. Brunelle * @from: source sector 8952db270a8SFrederic Weisbecker * 8962db270a8SFrederic Weisbecker * Description: 8972db270a8SFrederic Weisbecker * Device mapper or raid target sometimes need to split a bio because 8982db270a8SFrederic Weisbecker * it spans a stripe (or similar). Add a trace for that action. 8992db270a8SFrederic Weisbecker * 9002db270a8SFrederic Weisbecker **/ 901d07335e5SMike Snitzer static void blk_add_trace_bio_remap(void *ignore, 90238516ab5SSteven Rostedt struct request_queue *q, struct bio *bio, 90322a7c31aSAlan D. Brunelle dev_t dev, sector_t from) 9042db270a8SFrederic Weisbecker { 9052db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 9062db270a8SFrederic Weisbecker struct blk_io_trace_remap r; 9072db270a8SFrederic Weisbecker 9082db270a8SFrederic Weisbecker if (likely(!bt)) 9092db270a8SFrederic Weisbecker return; 9102db270a8SFrederic Weisbecker 911a42aaa3bSAlan D. Brunelle r.device_from = cpu_to_be32(dev); 912a42aaa3bSAlan D. Brunelle r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev); 913a42aaa3bSAlan D. Brunelle r.sector_from = cpu_to_be64(from); 9142db270a8SFrederic Weisbecker 9154f024f37SKent Overstreet __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, 9161b9a9ab7SMike Christie bio_op(bio), bio->bi_rw, BLK_TA_REMAP, bio->bi_error, 9174246a0b6SChristoph Hellwig sizeof(r), &r); 9182db270a8SFrederic Weisbecker } 9192db270a8SFrederic Weisbecker 9202db270a8SFrederic Weisbecker /** 921b0da3f0dSJun'ichi Nomura * blk_add_trace_rq_remap - Add a trace for a request-remap operation 922546cf44aSRandy Dunlap * @ignore: trace callback data parameter (not used) 923b0da3f0dSJun'ichi Nomura * @q: queue the io is for 924b0da3f0dSJun'ichi Nomura * @rq: the source request 925b0da3f0dSJun'ichi Nomura * @dev: target device 926b0da3f0dSJun'ichi Nomura * @from: source sector 927b0da3f0dSJun'ichi Nomura * 928b0da3f0dSJun'ichi Nomura * Description: 929b0da3f0dSJun'ichi Nomura * Device mapper remaps request to other devices. 930b0da3f0dSJun'ichi Nomura * Add a trace for that action. 931b0da3f0dSJun'ichi Nomura * 932b0da3f0dSJun'ichi Nomura **/ 93338516ab5SSteven Rostedt static void blk_add_trace_rq_remap(void *ignore, 93438516ab5SSteven Rostedt struct request_queue *q, 935b0da3f0dSJun'ichi Nomura struct request *rq, dev_t dev, 936b0da3f0dSJun'ichi Nomura sector_t from) 937b0da3f0dSJun'ichi Nomura { 938b0da3f0dSJun'ichi Nomura struct blk_trace *bt = q->blk_trace; 939b0da3f0dSJun'ichi Nomura struct blk_io_trace_remap r; 940b0da3f0dSJun'ichi Nomura 941b0da3f0dSJun'ichi Nomura if (likely(!bt)) 942b0da3f0dSJun'ichi Nomura return; 943b0da3f0dSJun'ichi Nomura 944b0da3f0dSJun'ichi Nomura r.device_from = cpu_to_be32(dev); 945b0da3f0dSJun'ichi Nomura r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); 946b0da3f0dSJun'ichi Nomura r.sector_from = cpu_to_be64(from); 947b0da3f0dSJun'ichi Nomura 948b0da3f0dSJun'ichi Nomura __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 9491b9a9ab7SMike Christie rq_data_dir(rq), 0, BLK_TA_REMAP, !!rq->errors, 950b0da3f0dSJun'ichi Nomura sizeof(r), &r); 951b0da3f0dSJun'ichi Nomura } 952b0da3f0dSJun'ichi Nomura 953b0da3f0dSJun'ichi Nomura /** 9542db270a8SFrederic Weisbecker * blk_add_driver_data - Add binary message with driver-specific data 9552db270a8SFrederic Weisbecker * @q: queue the io is for 9562db270a8SFrederic Weisbecker * @rq: io request 9572db270a8SFrederic Weisbecker * @data: driver-specific data 9582db270a8SFrederic Weisbecker * @len: length of driver-specific data 9592db270a8SFrederic Weisbecker * 9602db270a8SFrederic Weisbecker * Description: 9612db270a8SFrederic Weisbecker * Some drivers might want to write driver-specific data per request. 9622db270a8SFrederic Weisbecker * 9632db270a8SFrederic Weisbecker **/ 9642db270a8SFrederic Weisbecker void blk_add_driver_data(struct request_queue *q, 9652db270a8SFrederic Weisbecker struct request *rq, 9662db270a8SFrederic Weisbecker void *data, size_t len) 9672db270a8SFrederic Weisbecker { 9682db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 9692db270a8SFrederic Weisbecker 9702db270a8SFrederic Weisbecker if (likely(!bt)) 9712db270a8SFrederic Weisbecker return; 9722db270a8SFrederic Weisbecker 97333659ebbSChristoph Hellwig if (rq->cmd_type == REQ_TYPE_BLOCK_PC) 9741b9a9ab7SMike Christie __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 0, 9752e46e8b2STejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9762db270a8SFrederic Weisbecker else 9771b9a9ab7SMike Christie __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 0, 9782e46e8b2STejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9792db270a8SFrederic Weisbecker } 9802db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_add_driver_data); 9812db270a8SFrederic Weisbecker 9823c289ba7SLi Zefan static void blk_register_tracepoints(void) 9832db270a8SFrederic Weisbecker { 9842db270a8SFrederic Weisbecker int ret; 9852db270a8SFrederic Weisbecker 98638516ab5SSteven Rostedt ret = register_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); 9872db270a8SFrederic Weisbecker WARN_ON(ret); 98838516ab5SSteven Rostedt ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); 9892db270a8SFrederic Weisbecker WARN_ON(ret); 99038516ab5SSteven Rostedt ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); 9912db270a8SFrederic Weisbecker WARN_ON(ret); 99238516ab5SSteven Rostedt ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); 9932db270a8SFrederic Weisbecker WARN_ON(ret); 99438516ab5SSteven Rostedt ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); 9952db270a8SFrederic Weisbecker WARN_ON(ret); 99638516ab5SSteven Rostedt ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); 9972db270a8SFrederic Weisbecker WARN_ON(ret); 99838516ab5SSteven Rostedt ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); 9992db270a8SFrederic Weisbecker WARN_ON(ret); 100038516ab5SSteven Rostedt ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); 10012db270a8SFrederic Weisbecker WARN_ON(ret); 100238516ab5SSteven Rostedt ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); 10032db270a8SFrederic Weisbecker WARN_ON(ret); 100438516ab5SSteven Rostedt ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); 10052db270a8SFrederic Weisbecker WARN_ON(ret); 100638516ab5SSteven Rostedt ret = register_trace_block_getrq(blk_add_trace_getrq, NULL); 10072db270a8SFrederic Weisbecker WARN_ON(ret); 100838516ab5SSteven Rostedt ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); 10092db270a8SFrederic Weisbecker WARN_ON(ret); 101038516ab5SSteven Rostedt ret = register_trace_block_plug(blk_add_trace_plug, NULL); 10112db270a8SFrederic Weisbecker WARN_ON(ret); 101249cac01eSJens Axboe ret = register_trace_block_unplug(blk_add_trace_unplug, NULL); 10132db270a8SFrederic Weisbecker WARN_ON(ret); 101438516ab5SSteven Rostedt ret = register_trace_block_split(blk_add_trace_split, NULL); 10152db270a8SFrederic Weisbecker WARN_ON(ret); 1016d07335e5SMike Snitzer ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); 10172db270a8SFrederic Weisbecker WARN_ON(ret); 101838516ab5SSteven Rostedt ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); 1019b0da3f0dSJun'ichi Nomura WARN_ON(ret); 10202db270a8SFrederic Weisbecker } 10212db270a8SFrederic Weisbecker 10222db270a8SFrederic Weisbecker static void blk_unregister_tracepoints(void) 10232db270a8SFrederic Weisbecker { 102438516ab5SSteven Rostedt unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); 1025d07335e5SMike Snitzer unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); 102638516ab5SSteven Rostedt unregister_trace_block_split(blk_add_trace_split, NULL); 102749cac01eSJens Axboe unregister_trace_block_unplug(blk_add_trace_unplug, NULL); 102838516ab5SSteven Rostedt unregister_trace_block_plug(blk_add_trace_plug, NULL); 102938516ab5SSteven Rostedt unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); 103038516ab5SSteven Rostedt unregister_trace_block_getrq(blk_add_trace_getrq, NULL); 103138516ab5SSteven Rostedt unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); 103238516ab5SSteven Rostedt unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); 103338516ab5SSteven Rostedt unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); 103438516ab5SSteven Rostedt unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); 103538516ab5SSteven Rostedt unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); 103638516ab5SSteven Rostedt unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); 103738516ab5SSteven Rostedt unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); 103838516ab5SSteven Rostedt unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); 103938516ab5SSteven Rostedt unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); 104038516ab5SSteven Rostedt unregister_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); 10412db270a8SFrederic Weisbecker 10422db270a8SFrederic Weisbecker tracepoint_synchronize_unregister(); 10432db270a8SFrederic Weisbecker } 10442db270a8SFrederic Weisbecker 10452db270a8SFrederic Weisbecker /* 10462db270a8SFrederic Weisbecker * struct blk_io_tracer formatting routines 10472db270a8SFrederic Weisbecker */ 10482db270a8SFrederic Weisbecker 10492db270a8SFrederic Weisbecker static void fill_rwbs(char *rwbs, const struct blk_io_trace *t) 10502db270a8SFrederic Weisbecker { 10512db270a8SFrederic Weisbecker int i = 0; 105265796348SLi Zefan int tc = t->action >> BLK_TC_SHIFT; 10532db270a8SFrederic Weisbecker 105418cea459SLi Zefan if (t->action == BLK_TN_MESSAGE) { 105518cea459SLi Zefan rwbs[i++] = 'N'; 105618cea459SLi Zefan goto out; 105718cea459SLi Zefan } 105818cea459SLi Zefan 1059c09c47caSNamhyung Kim if (tc & BLK_TC_FLUSH) 1060c09c47caSNamhyung Kim rwbs[i++] = 'F'; 1061c09c47caSNamhyung Kim 106265796348SLi Zefan if (tc & BLK_TC_DISCARD) 10632db270a8SFrederic Weisbecker rwbs[i++] = 'D'; 106465796348SLi Zefan else if (tc & BLK_TC_WRITE) 10652db270a8SFrederic Weisbecker rwbs[i++] = 'W'; 10662db270a8SFrederic Weisbecker else if (t->bytes) 10672db270a8SFrederic Weisbecker rwbs[i++] = 'R'; 10682db270a8SFrederic Weisbecker else 10692db270a8SFrederic Weisbecker rwbs[i++] = 'N'; 10702db270a8SFrederic Weisbecker 1071c09c47caSNamhyung Kim if (tc & BLK_TC_FUA) 1072c09c47caSNamhyung Kim rwbs[i++] = 'F'; 107365796348SLi Zefan if (tc & BLK_TC_AHEAD) 10742db270a8SFrederic Weisbecker rwbs[i++] = 'A'; 107565796348SLi Zefan if (tc & BLK_TC_SYNC) 10762db270a8SFrederic Weisbecker rwbs[i++] = 'S'; 107765796348SLi Zefan if (tc & BLK_TC_META) 10782db270a8SFrederic Weisbecker rwbs[i++] = 'M'; 107918cea459SLi Zefan out: 10802db270a8SFrederic Weisbecker rwbs[i] = '\0'; 10812db270a8SFrederic Weisbecker } 10822db270a8SFrederic Weisbecker 10832db270a8SFrederic Weisbecker static inline 10842db270a8SFrederic Weisbecker const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) 10852db270a8SFrederic Weisbecker { 10862db270a8SFrederic Weisbecker return (const struct blk_io_trace *)ent; 10872db270a8SFrederic Weisbecker } 10882db270a8SFrederic Weisbecker 10892db270a8SFrederic Weisbecker static inline const void *pdu_start(const struct trace_entry *ent) 10902db270a8SFrederic Weisbecker { 10912db270a8SFrederic Weisbecker return te_blk_io_trace(ent) + 1; 10922db270a8SFrederic Weisbecker } 10932db270a8SFrederic Weisbecker 109466de7792SLi Zefan static inline u32 t_action(const struct trace_entry *ent) 109566de7792SLi Zefan { 109666de7792SLi Zefan return te_blk_io_trace(ent)->action; 109766de7792SLi Zefan } 109866de7792SLi Zefan 109966de7792SLi Zefan static inline u32 t_bytes(const struct trace_entry *ent) 110066de7792SLi Zefan { 110166de7792SLi Zefan return te_blk_io_trace(ent)->bytes; 110266de7792SLi Zefan } 110366de7792SLi Zefan 11042db270a8SFrederic Weisbecker static inline u32 t_sec(const struct trace_entry *ent) 11052db270a8SFrederic Weisbecker { 11062db270a8SFrederic Weisbecker return te_blk_io_trace(ent)->bytes >> 9; 11072db270a8SFrederic Weisbecker } 11082db270a8SFrederic Weisbecker 11092db270a8SFrederic Weisbecker static inline unsigned long long t_sector(const struct trace_entry *ent) 11102db270a8SFrederic Weisbecker { 11112db270a8SFrederic Weisbecker return te_blk_io_trace(ent)->sector; 11122db270a8SFrederic Weisbecker } 11132db270a8SFrederic Weisbecker 11142db270a8SFrederic Weisbecker static inline __u16 t_error(const struct trace_entry *ent) 11152db270a8SFrederic Weisbecker { 1116e0dc81beSLi Zefan return te_blk_io_trace(ent)->error; 11172db270a8SFrederic Weisbecker } 11182db270a8SFrederic Weisbecker 11192db270a8SFrederic Weisbecker static __u64 get_pdu_int(const struct trace_entry *ent) 11202db270a8SFrederic Weisbecker { 11212db270a8SFrederic Weisbecker const __u64 *val = pdu_start(ent); 11222db270a8SFrederic Weisbecker return be64_to_cpu(*val); 11232db270a8SFrederic Weisbecker } 11242db270a8SFrederic Weisbecker 11252db270a8SFrederic Weisbecker static void get_pdu_remap(const struct trace_entry *ent, 11262db270a8SFrederic Weisbecker struct blk_io_trace_remap *r) 11272db270a8SFrederic Weisbecker { 11282db270a8SFrederic Weisbecker const struct blk_io_trace_remap *__r = pdu_start(ent); 1129a42aaa3bSAlan D. Brunelle __u64 sector_from = __r->sector_from; 11302db270a8SFrederic Weisbecker 11312db270a8SFrederic Weisbecker r->device_from = be32_to_cpu(__r->device_from); 1132a42aaa3bSAlan D. Brunelle r->device_to = be32_to_cpu(__r->device_to); 1133a42aaa3bSAlan D. Brunelle r->sector_from = be64_to_cpu(sector_from); 11342db270a8SFrederic Weisbecker } 11352db270a8SFrederic Weisbecker 1136f4a1d08cSSteven Rostedt (Red Hat) typedef void (blk_log_action_t) (struct trace_iterator *iter, const char *act); 1137b6a4b0c3SLi Zefan 1138f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_action_classic(struct trace_iterator *iter, const char *act) 11392db270a8SFrederic Weisbecker { 1140c09c47caSNamhyung Kim char rwbs[RWBS_LEN]; 114135ac51bfSLi Zefan unsigned long long ts = iter->ts; 114235ac51bfSLi Zefan unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); 11432db270a8SFrederic Weisbecker unsigned secs = (unsigned long)ts; 1144b6a4b0c3SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 11452db270a8SFrederic Weisbecker 11462db270a8SFrederic Weisbecker fill_rwbs(rwbs, t); 11472db270a8SFrederic Weisbecker 1148f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(&iter->seq, 114935ac51bfSLi Zefan "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", 11502db270a8SFrederic Weisbecker MAJOR(t->device), MINOR(t->device), iter->cpu, 1151b6a4b0c3SLi Zefan secs, nsec_rem, iter->ent->pid, act, rwbs); 11522db270a8SFrederic Weisbecker } 11532db270a8SFrederic Weisbecker 1154f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_action(struct trace_iterator *iter, const char *act) 11552db270a8SFrederic Weisbecker { 1156c09c47caSNamhyung Kim char rwbs[RWBS_LEN]; 1157b6a4b0c3SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1158b6a4b0c3SLi Zefan 11592db270a8SFrederic Weisbecker fill_rwbs(rwbs, t); 1160f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", 11612db270a8SFrederic Weisbecker MAJOR(t->device), MINOR(t->device), act, rwbs); 11622db270a8SFrederic Weisbecker } 11632db270a8SFrederic Weisbecker 1164f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent) 116566de7792SLi Zefan { 116604986257SLi Zefan const unsigned char *pdu_buf; 116766de7792SLi Zefan int pdu_len; 1168f4a1d08cSSteven Rostedt (Red Hat) int i, end; 116966de7792SLi Zefan 117066de7792SLi Zefan pdu_buf = pdu_start(ent); 117166de7792SLi Zefan pdu_len = te_blk_io_trace(ent)->pdu_len; 117266de7792SLi Zefan 117366de7792SLi Zefan if (!pdu_len) 1174f4a1d08cSSteven Rostedt (Red Hat) return; 117566de7792SLi Zefan 117666de7792SLi Zefan /* find the last zero that needs to be printed */ 117766de7792SLi Zefan for (end = pdu_len - 1; end >= 0; end--) 117866de7792SLi Zefan if (pdu_buf[end]) 117966de7792SLi Zefan break; 118066de7792SLi Zefan end++; 118166de7792SLi Zefan 1182f4a1d08cSSteven Rostedt (Red Hat) trace_seq_putc(s, '('); 118366de7792SLi Zefan 118466de7792SLi Zefan for (i = 0; i < pdu_len; i++) { 118566de7792SLi Zefan 1186f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%s%02x", 118766de7792SLi Zefan i == 0 ? "" : " ", pdu_buf[i]); 118866de7792SLi Zefan 118966de7792SLi Zefan /* 119066de7792SLi Zefan * stop when the rest is just zeroes and indicate so 119166de7792SLi Zefan * with a ".." appended 119266de7792SLi Zefan */ 1193f4a1d08cSSteven Rostedt (Red Hat) if (i == end && end != pdu_len - 1) { 1194f4a1d08cSSteven Rostedt (Red Hat) trace_seq_puts(s, " ..) "); 1195f4a1d08cSSteven Rostedt (Red Hat) return; 1196f4a1d08cSSteven Rostedt (Red Hat) } 119766de7792SLi Zefan } 119866de7792SLi Zefan 1199f4a1d08cSSteven Rostedt (Red Hat) trace_seq_puts(s, ") "); 120066de7792SLi Zefan } 120166de7792SLi Zefan 1202f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_generic(struct trace_seq *s, const struct trace_entry *ent) 12032db270a8SFrederic Weisbecker { 12044ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12054ca53085SSteven Rostedt 12064ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12072db270a8SFrederic Weisbecker 120866de7792SLi Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 1209f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%u ", t_bytes(ent)); 1210f4a1d08cSSteven Rostedt (Red Hat) blk_log_dump_pdu(s, ent); 1211f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "[%s]\n", cmd); 121266de7792SLi Zefan } else { 12132db270a8SFrederic Weisbecker if (t_sec(ent)) 1214f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%llu + %u [%s]\n", 12152db270a8SFrederic Weisbecker t_sector(ent), t_sec(ent), cmd); 1216f4a1d08cSSteven Rostedt (Red Hat) else 1217f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "[%s]\n", cmd); 12182db270a8SFrederic Weisbecker } 121966de7792SLi Zefan } 12202db270a8SFrederic Weisbecker 1221f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_with_error(struct trace_seq *s, 12222db270a8SFrederic Weisbecker const struct trace_entry *ent) 12232db270a8SFrederic Weisbecker { 122466de7792SLi Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 1225f4a1d08cSSteven Rostedt (Red Hat) blk_log_dump_pdu(s, ent); 1226f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "[%d]\n", t_error(ent)); 122766de7792SLi Zefan } else { 12282db270a8SFrederic Weisbecker if (t_sec(ent)) 1229f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%llu + %u [%d]\n", 123066de7792SLi Zefan t_sector(ent), 12312db270a8SFrederic Weisbecker t_sec(ent), t_error(ent)); 1232f4a1d08cSSteven Rostedt (Red Hat) else 1233f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%llu [%d]\n", 123466de7792SLi Zefan t_sector(ent), t_error(ent)); 123566de7792SLi Zefan } 12362db270a8SFrederic Weisbecker } 12372db270a8SFrederic Weisbecker 1238f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_remap(struct trace_seq *s, const struct trace_entry *ent) 12392db270a8SFrederic Weisbecker { 1240a42aaa3bSAlan D. Brunelle struct blk_io_trace_remap r = { .device_from = 0, }; 12412db270a8SFrederic Weisbecker 12422db270a8SFrederic Weisbecker get_pdu_remap(ent, &r); 1243f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", 1244a42aaa3bSAlan D. Brunelle t_sector(ent), t_sec(ent), 1245a42aaa3bSAlan D. Brunelle MAJOR(r.device_from), MINOR(r.device_from), 1246a42aaa3bSAlan D. Brunelle (unsigned long long)r.sector_from); 12472db270a8SFrederic Weisbecker } 12482db270a8SFrederic Weisbecker 1249f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_plug(struct trace_seq *s, const struct trace_entry *ent) 12502db270a8SFrederic Weisbecker { 12514ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12524ca53085SSteven Rostedt 12534ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12544ca53085SSteven Rostedt 1255f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "[%s]\n", cmd); 12562db270a8SFrederic Weisbecker } 12572db270a8SFrederic Weisbecker 1258f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent) 12592db270a8SFrederic Weisbecker { 12604ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12614ca53085SSteven Rostedt 12624ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12634ca53085SSteven Rostedt 1264f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent)); 12652db270a8SFrederic Weisbecker } 12662db270a8SFrederic Weisbecker 1267f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_split(struct trace_seq *s, const struct trace_entry *ent) 12682db270a8SFrederic Weisbecker { 12694ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12704ca53085SSteven Rostedt 12714ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12724ca53085SSteven Rostedt 1273f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), 12744ca53085SSteven Rostedt get_pdu_int(ent), cmd); 12752db270a8SFrederic Weisbecker } 12762db270a8SFrederic Weisbecker 1277f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_msg(struct trace_seq *s, const struct trace_entry *ent) 127818cea459SLi Zefan { 127918cea459SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(ent); 128018cea459SLi Zefan 1281f4a1d08cSSteven Rostedt (Red Hat) trace_seq_putmem(s, t + 1, t->pdu_len); 1282f4a1d08cSSteven Rostedt (Red Hat) trace_seq_putc(s, '\n'); 128318cea459SLi Zefan } 128418cea459SLi Zefan 12852db270a8SFrederic Weisbecker /* 12862db270a8SFrederic Weisbecker * struct tracer operations 12872db270a8SFrederic Weisbecker */ 12882db270a8SFrederic Weisbecker 12892db270a8SFrederic Weisbecker static void blk_tracer_print_header(struct seq_file *m) 12902db270a8SFrederic Weisbecker { 12912db270a8SFrederic Weisbecker if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 12922db270a8SFrederic Weisbecker return; 12932db270a8SFrederic Weisbecker seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" 12942db270a8SFrederic Weisbecker "# | | | | | |\n"); 12952db270a8SFrederic Weisbecker } 12962db270a8SFrederic Weisbecker 12972db270a8SFrederic Weisbecker static void blk_tracer_start(struct trace_array *tr) 12982db270a8SFrederic Weisbecker { 1299ad5dd549SLi Zefan blk_tracer_enabled = true; 13002db270a8SFrederic Weisbecker } 13012db270a8SFrederic Weisbecker 13022db270a8SFrederic Weisbecker static int blk_tracer_init(struct trace_array *tr) 13032db270a8SFrederic Weisbecker { 13042db270a8SFrederic Weisbecker blk_tr = tr; 13052db270a8SFrederic Weisbecker blk_tracer_start(tr); 13062db270a8SFrederic Weisbecker return 0; 13072db270a8SFrederic Weisbecker } 13082db270a8SFrederic Weisbecker 13092db270a8SFrederic Weisbecker static void blk_tracer_stop(struct trace_array *tr) 13102db270a8SFrederic Weisbecker { 1311ad5dd549SLi Zefan blk_tracer_enabled = false; 13122db270a8SFrederic Weisbecker } 13132db270a8SFrederic Weisbecker 13142db270a8SFrederic Weisbecker static void blk_tracer_reset(struct trace_array *tr) 13152db270a8SFrederic Weisbecker { 13162db270a8SFrederic Weisbecker blk_tracer_stop(tr); 13172db270a8SFrederic Weisbecker } 13182db270a8SFrederic Weisbecker 1319e4955c99SLi Zefan static const struct { 13202db270a8SFrederic Weisbecker const char *act[2]; 1321f4a1d08cSSteven Rostedt (Red Hat) void (*print)(struct trace_seq *s, const struct trace_entry *ent); 1322e4955c99SLi Zefan } what2act[] = { 13232db270a8SFrederic Weisbecker [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, 13242db270a8SFrederic Weisbecker [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, 13252db270a8SFrederic Weisbecker [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, 13262db270a8SFrederic Weisbecker [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, 13272db270a8SFrederic Weisbecker [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, 13282db270a8SFrederic Weisbecker [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, 13292db270a8SFrederic Weisbecker [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, 13302db270a8SFrederic Weisbecker [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, 13312db270a8SFrederic Weisbecker [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, 13322db270a8SFrederic Weisbecker [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, 133349cac01eSJens Axboe [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, 13342db270a8SFrederic Weisbecker [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, 13352db270a8SFrederic Weisbecker [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, 13362db270a8SFrederic Weisbecker [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, 13372db270a8SFrederic Weisbecker [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, 13382db270a8SFrederic Weisbecker }; 13392db270a8SFrederic Weisbecker 1340b6a4b0c3SLi Zefan static enum print_line_t print_one_line(struct trace_iterator *iter, 1341b6a4b0c3SLi Zefan bool classic) 13422db270a8SFrederic Weisbecker { 1343983f938aSSteven Rostedt (Red Hat) struct trace_array *tr = iter->tr; 13442db270a8SFrederic Weisbecker struct trace_seq *s = &iter->seq; 1345b6a4b0c3SLi Zefan const struct blk_io_trace *t; 1346b6a4b0c3SLi Zefan u16 what; 1347b6a4b0c3SLi Zefan bool long_act; 1348b6a4b0c3SLi Zefan blk_log_action_t *log_action; 13492db270a8SFrederic Weisbecker 1350b6a4b0c3SLi Zefan t = te_blk_io_trace(iter->ent); 1351b6a4b0c3SLi Zefan what = t->action & ((1 << BLK_TC_SHIFT) - 1); 1352983f938aSSteven Rostedt (Red Hat) long_act = !!(tr->trace_flags & TRACE_ITER_VERBOSE); 1353b6a4b0c3SLi Zefan log_action = classic ? &blk_log_action_classic : &blk_log_action; 13542db270a8SFrederic Weisbecker 135518cea459SLi Zefan if (t->action == BLK_TN_MESSAGE) { 1356f4a1d08cSSteven Rostedt (Red Hat) log_action(iter, long_act ? "message" : "m"); 1357f4a1d08cSSteven Rostedt (Red Hat) blk_log_msg(s, iter->ent); 1358b7d7641eSShaohua Li return trace_handle_return(s); 135918cea459SLi Zefan } 136018cea459SLi Zefan 1361eb08f8ebSLi Zefan if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) 1362f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "Unknown action %x\n", what); 13632db270a8SFrederic Weisbecker else { 1364f4a1d08cSSteven Rostedt (Red Hat) log_action(iter, what2act[what].act[long_act]); 1365f4a1d08cSSteven Rostedt (Red Hat) what2act[what].print(s, iter->ent); 13662db270a8SFrederic Weisbecker } 1367f4a1d08cSSteven Rostedt (Red Hat) 1368f4a1d08cSSteven Rostedt (Red Hat) return trace_handle_return(s); 13692db270a8SFrederic Weisbecker } 13702db270a8SFrederic Weisbecker 1371b6a4b0c3SLi Zefan static enum print_line_t blk_trace_event_print(struct trace_iterator *iter, 1372a9a57763SSteven Rostedt int flags, struct trace_event *event) 1373b6a4b0c3SLi Zefan { 1374b6a4b0c3SLi Zefan return print_one_line(iter, false); 1375b6a4b0c3SLi Zefan } 1376b6a4b0c3SLi Zefan 1377f4a1d08cSSteven Rostedt (Red Hat) static void blk_trace_synthesize_old_trace(struct trace_iterator *iter) 13782db270a8SFrederic Weisbecker { 13792db270a8SFrederic Weisbecker struct trace_seq *s = &iter->seq; 13802db270a8SFrederic Weisbecker struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; 13812db270a8SFrederic Weisbecker const int offset = offsetof(struct blk_io_trace, sector); 13822db270a8SFrederic Weisbecker struct blk_io_trace old = { 13832db270a8SFrederic Weisbecker .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, 13846c051ce0SLi Zefan .time = iter->ts, 13852db270a8SFrederic Weisbecker }; 13862db270a8SFrederic Weisbecker 1387f4a1d08cSSteven Rostedt (Red Hat) trace_seq_putmem(s, &old, offset); 1388f4a1d08cSSteven Rostedt (Red Hat) trace_seq_putmem(s, &t->sector, 13892db270a8SFrederic Weisbecker sizeof(old) - offset + t->pdu_len); 13902db270a8SFrederic Weisbecker } 13912db270a8SFrederic Weisbecker 13922db270a8SFrederic Weisbecker static enum print_line_t 1393a9a57763SSteven Rostedt blk_trace_event_print_binary(struct trace_iterator *iter, int flags, 1394a9a57763SSteven Rostedt struct trace_event *event) 13952db270a8SFrederic Weisbecker { 1396f4a1d08cSSteven Rostedt (Red Hat) blk_trace_synthesize_old_trace(iter); 1397f4a1d08cSSteven Rostedt (Red Hat) 1398f4a1d08cSSteven Rostedt (Red Hat) return trace_handle_return(&iter->seq); 13992db270a8SFrederic Weisbecker } 14002db270a8SFrederic Weisbecker 14012db270a8SFrederic Weisbecker static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) 14022db270a8SFrederic Weisbecker { 14032db270a8SFrederic Weisbecker if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 14042db270a8SFrederic Weisbecker return TRACE_TYPE_UNHANDLED; 14052db270a8SFrederic Weisbecker 1406b6a4b0c3SLi Zefan return print_one_line(iter, true); 14072db270a8SFrederic Weisbecker } 14082db270a8SFrederic Weisbecker 14098c1a49aeSSteven Rostedt (Red Hat) static int 14108c1a49aeSSteven Rostedt (Red Hat) blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) 1411f3948f88SLi Zefan { 1412f3948f88SLi Zefan /* don't output context-info for blk_classic output */ 1413f3948f88SLi Zefan if (bit == TRACE_BLK_OPT_CLASSIC) { 1414f3948f88SLi Zefan if (set) 1415983f938aSSteven Rostedt (Red Hat) tr->trace_flags &= ~TRACE_ITER_CONTEXT_INFO; 1416f3948f88SLi Zefan else 1417983f938aSSteven Rostedt (Red Hat) tr->trace_flags |= TRACE_ITER_CONTEXT_INFO; 1418f3948f88SLi Zefan } 1419f3948f88SLi Zefan return 0; 1420f3948f88SLi Zefan } 1421f3948f88SLi Zefan 14222db270a8SFrederic Weisbecker static struct tracer blk_tracer __read_mostly = { 14232db270a8SFrederic Weisbecker .name = "blk", 14242db270a8SFrederic Weisbecker .init = blk_tracer_init, 14252db270a8SFrederic Weisbecker .reset = blk_tracer_reset, 14262db270a8SFrederic Weisbecker .start = blk_tracer_start, 14272db270a8SFrederic Weisbecker .stop = blk_tracer_stop, 14282db270a8SFrederic Weisbecker .print_header = blk_tracer_print_header, 14292db270a8SFrederic Weisbecker .print_line = blk_tracer_print_line, 14302db270a8SFrederic Weisbecker .flags = &blk_tracer_flags, 1431f3948f88SLi Zefan .set_flag = blk_tracer_set_flag, 14322db270a8SFrederic Weisbecker }; 14332db270a8SFrederic Weisbecker 1434a9a57763SSteven Rostedt static struct trace_event_functions trace_blk_event_funcs = { 14352db270a8SFrederic Weisbecker .trace = blk_trace_event_print, 14362db270a8SFrederic Weisbecker .binary = blk_trace_event_print_binary, 14372db270a8SFrederic Weisbecker }; 14382db270a8SFrederic Weisbecker 1439a9a57763SSteven Rostedt static struct trace_event trace_blk_event = { 1440a9a57763SSteven Rostedt .type = TRACE_BLK, 1441a9a57763SSteven Rostedt .funcs = &trace_blk_event_funcs, 1442a9a57763SSteven Rostedt }; 1443a9a57763SSteven Rostedt 14442db270a8SFrederic Weisbecker static int __init init_blk_tracer(void) 14452db270a8SFrederic Weisbecker { 14469023c930SSteven Rostedt (Red Hat) if (!register_trace_event(&trace_blk_event)) { 1447a395d6a7SJoe Perches pr_warn("Warning: could not register block events\n"); 14482db270a8SFrederic Weisbecker return 1; 14492db270a8SFrederic Weisbecker } 14502db270a8SFrederic Weisbecker 14512db270a8SFrederic Weisbecker if (register_tracer(&blk_tracer) != 0) { 1452a395d6a7SJoe Perches pr_warn("Warning: could not register the block tracer\n"); 14539023c930SSteven Rostedt (Red Hat) unregister_trace_event(&trace_blk_event); 14542db270a8SFrederic Weisbecker return 1; 14552db270a8SFrederic Weisbecker } 14562db270a8SFrederic Weisbecker 14572db270a8SFrederic Weisbecker return 0; 14582db270a8SFrederic Weisbecker } 14592db270a8SFrederic Weisbecker 14602db270a8SFrederic Weisbecker device_initcall(init_blk_tracer); 14612db270a8SFrederic Weisbecker 14622db270a8SFrederic Weisbecker static int blk_trace_remove_queue(struct request_queue *q) 14632db270a8SFrederic Weisbecker { 14642db270a8SFrederic Weisbecker struct blk_trace *bt; 14652db270a8SFrederic Weisbecker 14662db270a8SFrederic Weisbecker bt = xchg(&q->blk_trace, NULL); 14672db270a8SFrederic Weisbecker if (bt == NULL) 14682db270a8SFrederic Weisbecker return -EINVAL; 14692db270a8SFrederic Weisbecker 147017ba97e3SLi Zefan if (atomic_dec_and_test(&blk_probes_ref)) 147117ba97e3SLi Zefan blk_unregister_tracepoints(); 147217ba97e3SLi Zefan 1473ad5dd549SLi Zefan blk_trace_free(bt); 14742db270a8SFrederic Weisbecker return 0; 14752db270a8SFrederic Weisbecker } 14762db270a8SFrederic Weisbecker 14772db270a8SFrederic Weisbecker /* 14782db270a8SFrederic Weisbecker * Setup everything required to start tracing 14792db270a8SFrederic Weisbecker */ 14809908c309SLi Zefan static int blk_trace_setup_queue(struct request_queue *q, 14819908c309SLi Zefan struct block_device *bdev) 14822db270a8SFrederic Weisbecker { 1483cdea01b2SDavidlohr Bueso struct blk_trace *bt = NULL; 148418cea459SLi Zefan int ret = -ENOMEM; 14852db270a8SFrederic Weisbecker 14862db270a8SFrederic Weisbecker bt = kzalloc(sizeof(*bt), GFP_KERNEL); 14872db270a8SFrederic Weisbecker if (!bt) 148815152e44SLi Zefan return -ENOMEM; 14892db270a8SFrederic Weisbecker 149018cea459SLi Zefan bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 149118cea459SLi Zefan if (!bt->msg_data) 149218cea459SLi Zefan goto free_bt; 149318cea459SLi Zefan 14949908c309SLi Zefan bt->dev = bdev->bd_dev; 14952db270a8SFrederic Weisbecker bt->act_mask = (u16)-1; 14969908c309SLi Zefan 14979908c309SLi Zefan blk_trace_setup_lba(bt, bdev); 14982db270a8SFrederic Weisbecker 149918cea459SLi Zefan ret = -EBUSY; 1500cdea01b2SDavidlohr Bueso if (cmpxchg(&q->blk_trace, NULL, bt)) 150118cea459SLi Zefan goto free_bt; 150215152e44SLi Zefan 150317ba97e3SLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 150417ba97e3SLi Zefan blk_register_tracepoints(); 15052db270a8SFrederic Weisbecker return 0; 150618cea459SLi Zefan 150718cea459SLi Zefan free_bt: 150818cea459SLi Zefan blk_trace_free(bt); 150918cea459SLi Zefan return ret; 15102db270a8SFrederic Weisbecker } 15112db270a8SFrederic Weisbecker 15122db270a8SFrederic Weisbecker /* 15132db270a8SFrederic Weisbecker * sysfs interface to enable and configure tracing 15142db270a8SFrederic Weisbecker */ 15152db270a8SFrederic Weisbecker 15162db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_show(struct device *dev, 15172db270a8SFrederic Weisbecker struct device_attribute *attr, 15182db270a8SFrederic Weisbecker char *buf); 15192db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_store(struct device *dev, 15202db270a8SFrederic Weisbecker struct device_attribute *attr, 15212db270a8SFrederic Weisbecker const char *buf, size_t count); 15222db270a8SFrederic Weisbecker #define BLK_TRACE_DEVICE_ATTR(_name) \ 15232db270a8SFrederic Weisbecker DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ 15242db270a8SFrederic Weisbecker sysfs_blk_trace_attr_show, \ 15252db270a8SFrederic Weisbecker sysfs_blk_trace_attr_store) 15262db270a8SFrederic Weisbecker 1527cd649b8bSLi Zefan static BLK_TRACE_DEVICE_ATTR(enable); 15282db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(act_mask); 15292db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(pid); 15302db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(start_lba); 15312db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(end_lba); 15322db270a8SFrederic Weisbecker 15332db270a8SFrederic Weisbecker static struct attribute *blk_trace_attrs[] = { 15342db270a8SFrederic Weisbecker &dev_attr_enable.attr, 15352db270a8SFrederic Weisbecker &dev_attr_act_mask.attr, 15362db270a8SFrederic Weisbecker &dev_attr_pid.attr, 15372db270a8SFrederic Weisbecker &dev_attr_start_lba.attr, 15382db270a8SFrederic Weisbecker &dev_attr_end_lba.attr, 15392db270a8SFrederic Weisbecker NULL 15402db270a8SFrederic Weisbecker }; 15412db270a8SFrederic Weisbecker 15422db270a8SFrederic Weisbecker struct attribute_group blk_trace_attr_group = { 15432db270a8SFrederic Weisbecker .name = "trace", 15442db270a8SFrederic Weisbecker .attrs = blk_trace_attrs, 15452db270a8SFrederic Weisbecker }; 15462db270a8SFrederic Weisbecker 154709341997SLi Zefan static const struct { 154809341997SLi Zefan int mask; 154909341997SLi Zefan const char *str; 155009341997SLi Zefan } mask_maps[] = { 155109341997SLi Zefan { BLK_TC_READ, "read" }, 155209341997SLi Zefan { BLK_TC_WRITE, "write" }, 1553c09c47caSNamhyung Kim { BLK_TC_FLUSH, "flush" }, 155409341997SLi Zefan { BLK_TC_SYNC, "sync" }, 155509341997SLi Zefan { BLK_TC_QUEUE, "queue" }, 155609341997SLi Zefan { BLK_TC_REQUEUE, "requeue" }, 155709341997SLi Zefan { BLK_TC_ISSUE, "issue" }, 155809341997SLi Zefan { BLK_TC_COMPLETE, "complete" }, 155909341997SLi Zefan { BLK_TC_FS, "fs" }, 156009341997SLi Zefan { BLK_TC_PC, "pc" }, 15618d1547e0SShaohua Li { BLK_TC_NOTIFY, "notify" }, 156209341997SLi Zefan { BLK_TC_AHEAD, "ahead" }, 156309341997SLi Zefan { BLK_TC_META, "meta" }, 156409341997SLi Zefan { BLK_TC_DISCARD, "discard" }, 156509341997SLi Zefan { BLK_TC_DRV_DATA, "drv_data" }, 1566c09c47caSNamhyung Kim { BLK_TC_FUA, "fua" }, 156709341997SLi Zefan }; 156809341997SLi Zefan 156909341997SLi Zefan static int blk_trace_str2mask(const char *str) 15702db270a8SFrederic Weisbecker { 157109341997SLi Zefan int i; 15722db270a8SFrederic Weisbecker int mask = 0; 15739eb85125SLi Zefan char *buf, *s, *token; 15742db270a8SFrederic Weisbecker 15759eb85125SLi Zefan buf = kstrdup(str, GFP_KERNEL); 15769eb85125SLi Zefan if (buf == NULL) 15772db270a8SFrederic Weisbecker return -ENOMEM; 15789eb85125SLi Zefan s = strstrip(buf); 15792db270a8SFrederic Weisbecker 15802db270a8SFrederic Weisbecker while (1) { 158109341997SLi Zefan token = strsep(&s, ","); 158209341997SLi Zefan if (token == NULL) 15832db270a8SFrederic Weisbecker break; 15842db270a8SFrederic Weisbecker 158509341997SLi Zefan if (*token == '\0') 158609341997SLi Zefan continue; 158709341997SLi Zefan 158809341997SLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 158909341997SLi Zefan if (strcasecmp(token, mask_maps[i].str) == 0) { 159009341997SLi Zefan mask |= mask_maps[i].mask; 159109341997SLi Zefan break; 15922db270a8SFrederic Weisbecker } 159309341997SLi Zefan } 159409341997SLi Zefan if (i == ARRAY_SIZE(mask_maps)) { 159509341997SLi Zefan mask = -EINVAL; 159609341997SLi Zefan break; 159709341997SLi Zefan } 159809341997SLi Zefan } 15999eb85125SLi Zefan kfree(buf); 16002db270a8SFrederic Weisbecker 16012db270a8SFrederic Weisbecker return mask; 16022db270a8SFrederic Weisbecker } 16032db270a8SFrederic Weisbecker 160409341997SLi Zefan static ssize_t blk_trace_mask2str(char *buf, int mask) 160509341997SLi Zefan { 160609341997SLi Zefan int i; 160709341997SLi Zefan char *p = buf; 160809341997SLi Zefan 160909341997SLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 161009341997SLi Zefan if (mask & mask_maps[i].mask) { 161109341997SLi Zefan p += sprintf(p, "%s%s", 161209341997SLi Zefan (p == buf) ? "" : ",", mask_maps[i].str); 161309341997SLi Zefan } 161409341997SLi Zefan } 161509341997SLi Zefan *p++ = '\n'; 161609341997SLi Zefan 161709341997SLi Zefan return p - buf; 161809341997SLi Zefan } 161909341997SLi Zefan 1620b125130bSLi Zefan static struct request_queue *blk_trace_get_queue(struct block_device *bdev) 1621b125130bSLi Zefan { 1622b125130bSLi Zefan if (bdev->bd_disk == NULL) 1623b125130bSLi Zefan return NULL; 1624b125130bSLi Zefan 1625b125130bSLi Zefan return bdev_get_queue(bdev); 1626b125130bSLi Zefan } 1627b125130bSLi Zefan 16282db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_show(struct device *dev, 16292db270a8SFrederic Weisbecker struct device_attribute *attr, 16302db270a8SFrederic Weisbecker char *buf) 16312db270a8SFrederic Weisbecker { 16322db270a8SFrederic Weisbecker struct hd_struct *p = dev_to_part(dev); 16332db270a8SFrederic Weisbecker struct request_queue *q; 16342db270a8SFrederic Weisbecker struct block_device *bdev; 16352db270a8SFrederic Weisbecker ssize_t ret = -ENXIO; 16362db270a8SFrederic Weisbecker 16372db270a8SFrederic Weisbecker bdev = bdget(part_devt(p)); 16382db270a8SFrederic Weisbecker if (bdev == NULL) 163901b284f9SArnd Bergmann goto out; 16402db270a8SFrederic Weisbecker 1641b125130bSLi Zefan q = blk_trace_get_queue(bdev); 16422db270a8SFrederic Weisbecker if (q == NULL) 16432db270a8SFrederic Weisbecker goto out_bdput; 1644b125130bSLi Zefan 16452db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 1646cd649b8bSLi Zefan 1647cd649b8bSLi Zefan if (attr == &dev_attr_enable) { 1648cd649b8bSLi Zefan ret = sprintf(buf, "%u\n", !!q->blk_trace); 1649cd649b8bSLi Zefan goto out_unlock_bdev; 1650cd649b8bSLi Zefan } 1651cd649b8bSLi Zefan 16522db270a8SFrederic Weisbecker if (q->blk_trace == NULL) 16532db270a8SFrederic Weisbecker ret = sprintf(buf, "disabled\n"); 16542db270a8SFrederic Weisbecker else if (attr == &dev_attr_act_mask) 165509341997SLi Zefan ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); 16562db270a8SFrederic Weisbecker else if (attr == &dev_attr_pid) 16572db270a8SFrederic Weisbecker ret = sprintf(buf, "%u\n", q->blk_trace->pid); 16582db270a8SFrederic Weisbecker else if (attr == &dev_attr_start_lba) 16592db270a8SFrederic Weisbecker ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); 16602db270a8SFrederic Weisbecker else if (attr == &dev_attr_end_lba) 16612db270a8SFrederic Weisbecker ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); 1662cd649b8bSLi Zefan 1663cd649b8bSLi Zefan out_unlock_bdev: 16642db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 16652db270a8SFrederic Weisbecker out_bdput: 16662db270a8SFrederic Weisbecker bdput(bdev); 166701b284f9SArnd Bergmann out: 16682db270a8SFrederic Weisbecker return ret; 16692db270a8SFrederic Weisbecker } 16702db270a8SFrederic Weisbecker 16712db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_store(struct device *dev, 16722db270a8SFrederic Weisbecker struct device_attribute *attr, 16732db270a8SFrederic Weisbecker const char *buf, size_t count) 16742db270a8SFrederic Weisbecker { 16752db270a8SFrederic Weisbecker struct block_device *bdev; 16762db270a8SFrederic Weisbecker struct request_queue *q; 16772db270a8SFrederic Weisbecker struct hd_struct *p; 16782db270a8SFrederic Weisbecker u64 value; 167909341997SLi Zefan ssize_t ret = -EINVAL; 16802db270a8SFrederic Weisbecker 16812db270a8SFrederic Weisbecker if (count == 0) 16822db270a8SFrederic Weisbecker goto out; 16832db270a8SFrederic Weisbecker 16842db270a8SFrederic Weisbecker if (attr == &dev_attr_act_mask) { 16852db270a8SFrederic Weisbecker if (sscanf(buf, "%llx", &value) != 1) { 16862db270a8SFrederic Weisbecker /* Assume it is a list of trace category names */ 168709341997SLi Zefan ret = blk_trace_str2mask(buf); 168809341997SLi Zefan if (ret < 0) 16892db270a8SFrederic Weisbecker goto out; 169009341997SLi Zefan value = ret; 16912db270a8SFrederic Weisbecker } 16922db270a8SFrederic Weisbecker } else if (sscanf(buf, "%llu", &value) != 1) 16932db270a8SFrederic Weisbecker goto out; 16942db270a8SFrederic Weisbecker 169509341997SLi Zefan ret = -ENXIO; 169609341997SLi Zefan 16972db270a8SFrederic Weisbecker p = dev_to_part(dev); 16982db270a8SFrederic Weisbecker bdev = bdget(part_devt(p)); 16992db270a8SFrederic Weisbecker if (bdev == NULL) 170001b284f9SArnd Bergmann goto out; 17012db270a8SFrederic Weisbecker 1702b125130bSLi Zefan q = blk_trace_get_queue(bdev); 17032db270a8SFrederic Weisbecker if (q == NULL) 17042db270a8SFrederic Weisbecker goto out_bdput; 17052db270a8SFrederic Weisbecker 17062db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 1707cd649b8bSLi Zefan 1708cd649b8bSLi Zefan if (attr == &dev_attr_enable) { 1709cd649b8bSLi Zefan if (value) 17109908c309SLi Zefan ret = blk_trace_setup_queue(q, bdev); 1711cd649b8bSLi Zefan else 1712cd649b8bSLi Zefan ret = blk_trace_remove_queue(q); 1713cd649b8bSLi Zefan goto out_unlock_bdev; 1714cd649b8bSLi Zefan } 1715cd649b8bSLi Zefan 17162db270a8SFrederic Weisbecker ret = 0; 17172db270a8SFrederic Weisbecker if (q->blk_trace == NULL) 17189908c309SLi Zefan ret = blk_trace_setup_queue(q, bdev); 17192db270a8SFrederic Weisbecker 17202db270a8SFrederic Weisbecker if (ret == 0) { 17212db270a8SFrederic Weisbecker if (attr == &dev_attr_act_mask) 17222db270a8SFrederic Weisbecker q->blk_trace->act_mask = value; 17232db270a8SFrederic Weisbecker else if (attr == &dev_attr_pid) 17242db270a8SFrederic Weisbecker q->blk_trace->pid = value; 17252db270a8SFrederic Weisbecker else if (attr == &dev_attr_start_lba) 17262db270a8SFrederic Weisbecker q->blk_trace->start_lba = value; 17272db270a8SFrederic Weisbecker else if (attr == &dev_attr_end_lba) 17282db270a8SFrederic Weisbecker q->blk_trace->end_lba = value; 17292db270a8SFrederic Weisbecker } 1730cd649b8bSLi Zefan 1731cd649b8bSLi Zefan out_unlock_bdev: 17322db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 17332db270a8SFrederic Weisbecker out_bdput: 17342db270a8SFrederic Weisbecker bdput(bdev); 17352db270a8SFrederic Weisbecker out: 1736cd649b8bSLi Zefan return ret ? ret : count; 17372db270a8SFrederic Weisbecker } 1738cd649b8bSLi Zefan 17391d54ad6dSLi Zefan int blk_trace_init_sysfs(struct device *dev) 17401d54ad6dSLi Zefan { 17411d54ad6dSLi Zefan return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); 17421d54ad6dSLi Zefan } 17431d54ad6dSLi Zefan 174448c0d4d4SZdenek Kabelac void blk_trace_remove_sysfs(struct device *dev) 174548c0d4d4SZdenek Kabelac { 174648c0d4d4SZdenek Kabelac sysfs_remove_group(&dev->kobj, &blk_trace_attr_group); 174748c0d4d4SZdenek Kabelac } 174848c0d4d4SZdenek Kabelac 174955782138SLi Zefan #endif /* CONFIG_BLK_DEV_IO_TRACE */ 175055782138SLi Zefan 175155782138SLi Zefan #ifdef CONFIG_EVENT_TRACING 175255782138SLi Zefan 175355782138SLi Zefan void blk_dump_cmd(char *buf, struct request *rq) 175455782138SLi Zefan { 175555782138SLi Zefan int i, end; 175655782138SLi Zefan int len = rq->cmd_len; 175755782138SLi Zefan unsigned char *cmd = rq->cmd; 175855782138SLi Zefan 175933659ebbSChristoph Hellwig if (rq->cmd_type != REQ_TYPE_BLOCK_PC) { 176055782138SLi Zefan buf[0] = '\0'; 176155782138SLi Zefan return; 176255782138SLi Zefan } 176355782138SLi Zefan 176455782138SLi Zefan for (end = len - 1; end >= 0; end--) 176555782138SLi Zefan if (cmd[end]) 176655782138SLi Zefan break; 176755782138SLi Zefan end++; 176855782138SLi Zefan 176955782138SLi Zefan for (i = 0; i < len; i++) { 177055782138SLi Zefan buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]); 177155782138SLi Zefan if (i == end && end != len - 1) { 177255782138SLi Zefan sprintf(buf, " .."); 177355782138SLi Zefan break; 177455782138SLi Zefan } 177555782138SLi Zefan } 177655782138SLi Zefan } 177755782138SLi Zefan 17781b9a9ab7SMike Christie void blk_fill_rwbs(char *rwbs, int op, u32 rw, int bytes) 177955782138SLi Zefan { 178055782138SLi Zefan int i = 0; 178155782138SLi Zefan 1782c09c47caSNamhyung Kim if (rw & REQ_FLUSH) 1783c09c47caSNamhyung Kim rwbs[i++] = 'F'; 1784c09c47caSNamhyung Kim 17851b9a9ab7SMike Christie switch (op) { 17861b9a9ab7SMike Christie case REQ_OP_WRITE: 17871b9a9ab7SMike Christie case REQ_OP_WRITE_SAME: 178855782138SLi Zefan rwbs[i++] = 'W'; 17891b9a9ab7SMike Christie break; 17901b9a9ab7SMike Christie case REQ_OP_DISCARD: 179155782138SLi Zefan rwbs[i++] = 'D'; 17921b9a9ab7SMike Christie break; 17933a5e02ceSMike Christie case REQ_OP_FLUSH: 17943a5e02ceSMike Christie rwbs[i++] = 'F'; 17953a5e02ceSMike Christie break; 17961b9a9ab7SMike Christie case REQ_OP_READ: 179755782138SLi Zefan rwbs[i++] = 'R'; 17981b9a9ab7SMike Christie break; 17991b9a9ab7SMike Christie default: 180055782138SLi Zefan rwbs[i++] = 'N'; 18011b9a9ab7SMike Christie } 180255782138SLi Zefan 1803c09c47caSNamhyung Kim if (rw & REQ_FUA) 1804c09c47caSNamhyung Kim rwbs[i++] = 'F'; 18057b6d91daSChristoph Hellwig if (rw & REQ_RAHEAD) 180655782138SLi Zefan rwbs[i++] = 'A'; 18077b6d91daSChristoph Hellwig if (rw & REQ_SYNC) 180855782138SLi Zefan rwbs[i++] = 'S'; 18097b6d91daSChristoph Hellwig if (rw & REQ_META) 181055782138SLi Zefan rwbs[i++] = 'M'; 18118d57a98cSAdrian Hunter if (rw & REQ_SECURE) 18128d57a98cSAdrian Hunter rwbs[i++] = 'E'; 181355782138SLi Zefan 181455782138SLi Zefan rwbs[i] = '\0'; 181555782138SLi Zefan } 18169ca8f8e5SKent Overstreet EXPORT_SYMBOL_GPL(blk_fill_rwbs); 181755782138SLi Zefan 181855782138SLi Zefan #endif /* CONFIG_EVENT_TRACING */ 181955782138SLi Zefan 1820