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 19228a8f0d3SMike Christie #define BLK_TC_PREFLUSH BLK_TC_FLUSH 1937b6d91daSChristoph Hellwig 1942db270a8SFrederic Weisbecker /* The ilog2() calls fall out because they're constant */ 1957b6d91daSChristoph Hellwig #define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \ 1967b6d91daSChristoph Hellwig (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name)) 1972db270a8SFrederic Weisbecker 1982db270a8SFrederic Weisbecker /* 1992db270a8SFrederic Weisbecker * The worker for the various blk_add_trace*() types. Fills out a 2002db270a8SFrederic Weisbecker * blk_io_trace structure and places it in a per-cpu subbuffer. 2012db270a8SFrederic Weisbecker */ 2022db270a8SFrederic Weisbecker static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, 2031b9a9ab7SMike Christie int op, int op_flags, u32 what, int error, int pdu_len, 2041b9a9ab7SMike Christie void *pdu_data) 2052db270a8SFrederic Weisbecker { 2062db270a8SFrederic Weisbecker struct task_struct *tsk = current; 2072db270a8SFrederic Weisbecker struct ring_buffer_event *event = NULL; 208e77405adSSteven Rostedt struct ring_buffer *buffer = NULL; 2092db270a8SFrederic Weisbecker struct blk_io_trace *t; 2102db270a8SFrederic Weisbecker unsigned long flags = 0; 2112db270a8SFrederic Weisbecker unsigned long *sequence; 2122db270a8SFrederic Weisbecker pid_t pid; 2132db270a8SFrederic Weisbecker int cpu, pc = 0; 21418cea459SLi Zefan bool blk_tracer = blk_tracer_enabled; 2152db270a8SFrederic Weisbecker 21618cea459SLi Zefan if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) 2172db270a8SFrederic Weisbecker return; 2182db270a8SFrederic Weisbecker 2191b9a9ab7SMike Christie what |= ddir_act[op_is_write(op) ? WRITE : READ]; 2201b9a9ab7SMike Christie what |= MASK_TC_BIT(op_flags, SYNC); 2211b9a9ab7SMike Christie what |= MASK_TC_BIT(op_flags, RAHEAD); 2221b9a9ab7SMike Christie what |= MASK_TC_BIT(op_flags, META); 22328a8f0d3SMike Christie what |= MASK_TC_BIT(op_flags, PREFLUSH); 2241b9a9ab7SMike Christie what |= MASK_TC_BIT(op_flags, FUA); 2251b9a9ab7SMike Christie if (op == REQ_OP_DISCARD) 2261b9a9ab7SMike Christie what |= BLK_TC_ACT(BLK_TC_DISCARD); 2273a5e02ceSMike Christie if (op == REQ_OP_FLUSH) 2283a5e02ceSMike Christie what |= BLK_TC_ACT(BLK_TC_FLUSH); 2292db270a8SFrederic Weisbecker 2302db270a8SFrederic Weisbecker pid = tsk->pid; 231d0deef5bSShawn Du if (act_log_check(bt, what, sector, pid)) 2322db270a8SFrederic Weisbecker return; 2332db270a8SFrederic Weisbecker cpu = raw_smp_processor_id(); 2342db270a8SFrederic Weisbecker 23518cea459SLi Zefan if (blk_tracer) { 2362db270a8SFrederic Weisbecker tracing_record_cmdline(current); 2372db270a8SFrederic Weisbecker 23812883efbSSteven Rostedt (Red Hat) buffer = blk_tr->trace_buffer.buffer; 2392db270a8SFrederic Weisbecker pc = preempt_count(); 240e77405adSSteven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BLK, 2412db270a8SFrederic Weisbecker sizeof(*t) + pdu_len, 2422db270a8SFrederic Weisbecker 0, pc); 2432db270a8SFrederic Weisbecker if (!event) 2442db270a8SFrederic Weisbecker return; 2452db270a8SFrederic Weisbecker t = ring_buffer_event_data(event); 2462db270a8SFrederic Weisbecker goto record_it; 2472db270a8SFrederic Weisbecker } 2482db270a8SFrederic Weisbecker 249a404d557SJan Kara if (unlikely(tsk->btrace_seq != blktrace_seq)) 250a404d557SJan Kara trace_note_tsk(tsk); 251a404d557SJan Kara 2522db270a8SFrederic Weisbecker /* 2532db270a8SFrederic Weisbecker * A word about the locking here - we disable interrupts to reserve 2542db270a8SFrederic Weisbecker * some space in the relay per-cpu buffer, to prevent an irq 2552db270a8SFrederic Weisbecker * from coming in and stepping on our toes. 2562db270a8SFrederic Weisbecker */ 2572db270a8SFrederic Weisbecker local_irq_save(flags); 2582db270a8SFrederic Weisbecker t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len); 2592db270a8SFrederic Weisbecker if (t) { 2602db270a8SFrederic Weisbecker sequence = per_cpu_ptr(bt->sequence, cpu); 2612db270a8SFrederic Weisbecker 2622db270a8SFrederic Weisbecker t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 2632db270a8SFrederic Weisbecker t->sequence = ++(*sequence); 2642db270a8SFrederic Weisbecker t->time = ktime_to_ns(ktime_get()); 2652db270a8SFrederic Weisbecker record_it: 2662db270a8SFrederic Weisbecker /* 2672db270a8SFrederic Weisbecker * These two are not needed in ftrace as they are in the 2682db270a8SFrederic Weisbecker * generic trace_entry, filled by tracing_generic_entry_update, 2692db270a8SFrederic Weisbecker * but for the trace_event->bin() synthesizer benefit we do it 2702db270a8SFrederic Weisbecker * here too. 2712db270a8SFrederic Weisbecker */ 2722db270a8SFrederic Weisbecker t->cpu = cpu; 2732db270a8SFrederic Weisbecker t->pid = pid; 2742db270a8SFrederic Weisbecker 2752db270a8SFrederic Weisbecker t->sector = sector; 2762db270a8SFrederic Weisbecker t->bytes = bytes; 2772db270a8SFrederic Weisbecker t->action = what; 2782db270a8SFrederic Weisbecker t->device = bt->dev; 2792db270a8SFrederic Weisbecker t->error = error; 2802db270a8SFrederic Weisbecker t->pdu_len = pdu_len; 2812db270a8SFrederic Weisbecker 2822db270a8SFrederic Weisbecker if (pdu_len) 2832db270a8SFrederic Weisbecker memcpy((void *) t + sizeof(*t), pdu_data, pdu_len); 2842db270a8SFrederic Weisbecker 28518cea459SLi Zefan if (blk_tracer) { 286b7f0c959SSteven Rostedt (Red Hat) trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc); 2872db270a8SFrederic Weisbecker return; 2882db270a8SFrederic Weisbecker } 2892db270a8SFrederic Weisbecker } 2902db270a8SFrederic Weisbecker 2912db270a8SFrederic Weisbecker local_irq_restore(flags); 2922db270a8SFrederic Weisbecker } 2932db270a8SFrederic Weisbecker 2942db270a8SFrederic Weisbecker static struct dentry *blk_tree_root; 2952db270a8SFrederic Weisbecker static DEFINE_MUTEX(blk_tree_mutex); 2962db270a8SFrederic Weisbecker 297ad5dd549SLi Zefan static void blk_trace_free(struct blk_trace *bt) 2982db270a8SFrederic Weisbecker { 2992db270a8SFrederic Weisbecker debugfs_remove(bt->msg_file); 3002db270a8SFrederic Weisbecker debugfs_remove(bt->dropped_file); 3012db270a8SFrederic Weisbecker relay_close(bt->rchan); 30239cbb602SAlan D. Brunelle debugfs_remove(bt->dir); 3032db270a8SFrederic Weisbecker free_percpu(bt->sequence); 3042db270a8SFrederic Weisbecker free_percpu(bt->msg_data); 3052db270a8SFrederic Weisbecker kfree(bt); 306ad5dd549SLi Zefan } 307ad5dd549SLi Zefan 308ad5dd549SLi Zefan static void blk_trace_cleanup(struct blk_trace *bt) 309ad5dd549SLi Zefan { 310ad5dd549SLi Zefan blk_trace_free(bt); 3112db270a8SFrederic Weisbecker if (atomic_dec_and_test(&blk_probes_ref)) 3122db270a8SFrederic Weisbecker blk_unregister_tracepoints(); 3132db270a8SFrederic Weisbecker } 3142db270a8SFrederic Weisbecker 3152db270a8SFrederic Weisbecker int blk_trace_remove(struct request_queue *q) 3162db270a8SFrederic Weisbecker { 3172db270a8SFrederic Weisbecker struct blk_trace *bt; 3182db270a8SFrederic Weisbecker 3192db270a8SFrederic Weisbecker bt = xchg(&q->blk_trace, NULL); 3202db270a8SFrederic Weisbecker if (!bt) 3212db270a8SFrederic Weisbecker return -EINVAL; 3222db270a8SFrederic Weisbecker 32355547204SLi Zefan if (bt->trace_state != Blktrace_running) 3242db270a8SFrederic Weisbecker blk_trace_cleanup(bt); 3252db270a8SFrederic Weisbecker 3262db270a8SFrederic Weisbecker return 0; 3272db270a8SFrederic Weisbecker } 3282db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_remove); 3292db270a8SFrederic Weisbecker 3302db270a8SFrederic Weisbecker static ssize_t blk_dropped_read(struct file *filp, char __user *buffer, 3312db270a8SFrederic Weisbecker size_t count, loff_t *ppos) 3322db270a8SFrederic Weisbecker { 3332db270a8SFrederic Weisbecker struct blk_trace *bt = filp->private_data; 3342db270a8SFrederic Weisbecker char buf[16]; 3352db270a8SFrederic Weisbecker 3362db270a8SFrederic Weisbecker snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); 3372db270a8SFrederic Weisbecker 3382db270a8SFrederic Weisbecker return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 3392db270a8SFrederic Weisbecker } 3402db270a8SFrederic Weisbecker 3412db270a8SFrederic Weisbecker static const struct file_operations blk_dropped_fops = { 3422db270a8SFrederic Weisbecker .owner = THIS_MODULE, 343234e3405SStephen Boyd .open = simple_open, 3442db270a8SFrederic Weisbecker .read = blk_dropped_read, 3456038f373SArnd Bergmann .llseek = default_llseek, 3462db270a8SFrederic Weisbecker }; 3472db270a8SFrederic Weisbecker 3482db270a8SFrederic Weisbecker static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, 3492db270a8SFrederic Weisbecker size_t count, loff_t *ppos) 3502db270a8SFrederic Weisbecker { 3512db270a8SFrederic Weisbecker char *msg; 3522db270a8SFrederic Weisbecker struct blk_trace *bt; 3532db270a8SFrederic Weisbecker 3547635b03aSLi Zefan if (count >= BLK_TN_MAX_MSG) 3552db270a8SFrederic Weisbecker return -EINVAL; 3562db270a8SFrederic Weisbecker 35716e5c1fcSAl Viro msg = memdup_user_nul(buffer, count); 35816e5c1fcSAl Viro if (IS_ERR(msg)) 35916e5c1fcSAl Viro return PTR_ERR(msg); 3602db270a8SFrederic Weisbecker 3612db270a8SFrederic Weisbecker bt = filp->private_data; 3622db270a8SFrederic Weisbecker __trace_note_message(bt, "%s", msg); 3632db270a8SFrederic Weisbecker kfree(msg); 3642db270a8SFrederic Weisbecker 3652db270a8SFrederic Weisbecker return count; 3662db270a8SFrederic Weisbecker } 3672db270a8SFrederic Weisbecker 3682db270a8SFrederic Weisbecker static const struct file_operations blk_msg_fops = { 3692db270a8SFrederic Weisbecker .owner = THIS_MODULE, 370234e3405SStephen Boyd .open = simple_open, 3712db270a8SFrederic Weisbecker .write = blk_msg_write, 3726038f373SArnd Bergmann .llseek = noop_llseek, 3732db270a8SFrederic Weisbecker }; 3742db270a8SFrederic Weisbecker 3752db270a8SFrederic Weisbecker /* 3762db270a8SFrederic Weisbecker * Keep track of how many times we encountered a full subbuffer, to aid 3772db270a8SFrederic Weisbecker * the user space app in telling how many lost events there were. 3782db270a8SFrederic Weisbecker */ 3792db270a8SFrederic Weisbecker static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, 3802db270a8SFrederic Weisbecker void *prev_subbuf, size_t prev_padding) 3812db270a8SFrederic Weisbecker { 3822db270a8SFrederic Weisbecker struct blk_trace *bt; 3832db270a8SFrederic Weisbecker 3842db270a8SFrederic Weisbecker if (!relay_buf_full(buf)) 3852db270a8SFrederic Weisbecker return 1; 3862db270a8SFrederic Weisbecker 3872db270a8SFrederic Weisbecker bt = buf->chan->private_data; 3882db270a8SFrederic Weisbecker atomic_inc(&bt->dropped); 3892db270a8SFrederic Weisbecker return 0; 3902db270a8SFrederic Weisbecker } 3912db270a8SFrederic Weisbecker 3922db270a8SFrederic Weisbecker static int blk_remove_buf_file_callback(struct dentry *dentry) 3932db270a8SFrederic Weisbecker { 3942db270a8SFrederic Weisbecker debugfs_remove(dentry); 3952db270a8SFrederic Weisbecker 3962db270a8SFrederic Weisbecker return 0; 3972db270a8SFrederic Weisbecker } 3982db270a8SFrederic Weisbecker 3992db270a8SFrederic Weisbecker static struct dentry *blk_create_buf_file_callback(const char *filename, 4002db270a8SFrederic Weisbecker struct dentry *parent, 401f4ae40a6SAl Viro umode_t mode, 4022db270a8SFrederic Weisbecker struct rchan_buf *buf, 4032db270a8SFrederic Weisbecker int *is_global) 4042db270a8SFrederic Weisbecker { 4052db270a8SFrederic Weisbecker return debugfs_create_file(filename, mode, parent, buf, 4062db270a8SFrederic Weisbecker &relay_file_operations); 4072db270a8SFrederic Weisbecker } 4082db270a8SFrederic Weisbecker 4092db270a8SFrederic Weisbecker static struct rchan_callbacks blk_relay_callbacks = { 4102db270a8SFrederic Weisbecker .subbuf_start = blk_subbuf_start_callback, 4112db270a8SFrederic Weisbecker .create_buf_file = blk_create_buf_file_callback, 4122db270a8SFrederic Weisbecker .remove_buf_file = blk_remove_buf_file_callback, 4132db270a8SFrederic Weisbecker }; 4142db270a8SFrederic Weisbecker 4159908c309SLi Zefan static void blk_trace_setup_lba(struct blk_trace *bt, 4169908c309SLi Zefan struct block_device *bdev) 4179908c309SLi Zefan { 4189908c309SLi Zefan struct hd_struct *part = NULL; 4199908c309SLi Zefan 4209908c309SLi Zefan if (bdev) 4219908c309SLi Zefan part = bdev->bd_part; 4229908c309SLi Zefan 4239908c309SLi Zefan if (part) { 4249908c309SLi Zefan bt->start_lba = part->start_sect; 4259908c309SLi Zefan bt->end_lba = part->start_sect + part->nr_sects; 4269908c309SLi Zefan } else { 4279908c309SLi Zefan bt->start_lba = 0; 4289908c309SLi Zefan bt->end_lba = -1ULL; 4299908c309SLi Zefan } 4309908c309SLi Zefan } 4319908c309SLi Zefan 4322db270a8SFrederic Weisbecker /* 4332db270a8SFrederic Weisbecker * Setup everything required to start tracing 4342db270a8SFrederic Weisbecker */ 4352db270a8SFrederic Weisbecker int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 436d0deef5bSShawn Du struct block_device *bdev, 4372db270a8SFrederic Weisbecker struct blk_user_trace_setup *buts) 4382db270a8SFrederic Weisbecker { 439cdea01b2SDavidlohr Bueso struct blk_trace *bt = NULL; 4402db270a8SFrederic Weisbecker struct dentry *dir = NULL; 441ff14417cSRasmus Villemoes int ret; 4422db270a8SFrederic Weisbecker 4432db270a8SFrederic Weisbecker if (!buts->buf_size || !buts->buf_nr) 4442db270a8SFrederic Weisbecker return -EINVAL; 4452db270a8SFrederic Weisbecker 4462db270a8SFrederic Weisbecker strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); 4472db270a8SFrederic Weisbecker buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; 4482db270a8SFrederic Weisbecker 4492db270a8SFrederic Weisbecker /* 4502db270a8SFrederic Weisbecker * some device names have larger paths - convert the slashes 4512db270a8SFrederic Weisbecker * to underscores for this to work as expected 4522db270a8SFrederic Weisbecker */ 453ff14417cSRasmus Villemoes strreplace(buts->name, '/', '_'); 4542db270a8SFrederic Weisbecker 4552db270a8SFrederic Weisbecker bt = kzalloc(sizeof(*bt), GFP_KERNEL); 4562db270a8SFrederic Weisbecker if (!bt) 457ad5dd549SLi Zefan return -ENOMEM; 4582db270a8SFrederic Weisbecker 459ad5dd549SLi Zefan ret = -ENOMEM; 4602db270a8SFrederic Weisbecker bt->sequence = alloc_percpu(unsigned long); 4612db270a8SFrederic Weisbecker if (!bt->sequence) 4622db270a8SFrederic Weisbecker goto err; 4632db270a8SFrederic Weisbecker 464f0ef0398SIngo Molnar bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 4652db270a8SFrederic Weisbecker if (!bt->msg_data) 4662db270a8SFrederic Weisbecker goto err; 4672db270a8SFrederic Weisbecker 4682db270a8SFrederic Weisbecker ret = -ENOENT; 4692db270a8SFrederic Weisbecker 470b5230b56SLi Zefan mutex_lock(&blk_tree_mutex); 4712db270a8SFrederic Weisbecker if (!blk_tree_root) { 4722db270a8SFrederic Weisbecker blk_tree_root = debugfs_create_dir("block", NULL); 473b5230b56SLi Zefan if (!blk_tree_root) { 474b5230b56SLi Zefan mutex_unlock(&blk_tree_mutex); 4751a17662eSLi Zefan goto err; 4762db270a8SFrederic Weisbecker } 477b5230b56SLi Zefan } 478b5230b56SLi Zefan mutex_unlock(&blk_tree_mutex); 4792db270a8SFrederic Weisbecker 4802db270a8SFrederic Weisbecker dir = debugfs_create_dir(buts->name, blk_tree_root); 4812db270a8SFrederic Weisbecker 4822db270a8SFrederic Weisbecker if (!dir) 4832db270a8SFrederic Weisbecker goto err; 4842db270a8SFrederic Weisbecker 4852db270a8SFrederic Weisbecker bt->dir = dir; 4862db270a8SFrederic Weisbecker bt->dev = dev; 4872db270a8SFrederic Weisbecker atomic_set(&bt->dropped, 0); 488a404d557SJan Kara INIT_LIST_HEAD(&bt->running_list); 4892db270a8SFrederic Weisbecker 4902db270a8SFrederic Weisbecker ret = -EIO; 4912db270a8SFrederic Weisbecker bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, 4922db270a8SFrederic Weisbecker &blk_dropped_fops); 4932db270a8SFrederic Weisbecker if (!bt->dropped_file) 4942db270a8SFrederic Weisbecker goto err; 4952db270a8SFrederic Weisbecker 4962db270a8SFrederic Weisbecker bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); 4972db270a8SFrederic Weisbecker if (!bt->msg_file) 4982db270a8SFrederic Weisbecker goto err; 4992db270a8SFrederic Weisbecker 5002db270a8SFrederic Weisbecker bt->rchan = relay_open("trace", dir, buts->buf_size, 5012db270a8SFrederic Weisbecker buts->buf_nr, &blk_relay_callbacks, bt); 5022db270a8SFrederic Weisbecker if (!bt->rchan) 5032db270a8SFrederic Weisbecker goto err; 5042db270a8SFrederic Weisbecker 5052db270a8SFrederic Weisbecker bt->act_mask = buts->act_mask; 5062db270a8SFrederic Weisbecker if (!bt->act_mask) 5072db270a8SFrederic Weisbecker bt->act_mask = (u16) -1; 5082db270a8SFrederic Weisbecker 5099908c309SLi Zefan blk_trace_setup_lba(bt, bdev); 5102db270a8SFrederic Weisbecker 511d0deef5bSShawn Du /* overwrite with user settings */ 512d0deef5bSShawn Du if (buts->start_lba) 513d0deef5bSShawn Du bt->start_lba = buts->start_lba; 514d0deef5bSShawn Du if (buts->end_lba) 515d0deef5bSShawn Du bt->end_lba = buts->end_lba; 516d0deef5bSShawn Du 5172db270a8SFrederic Weisbecker bt->pid = buts->pid; 5182db270a8SFrederic Weisbecker bt->trace_state = Blktrace_setup; 5192db270a8SFrederic Weisbecker 5202db270a8SFrederic Weisbecker ret = -EBUSY; 521cdea01b2SDavidlohr Bueso if (cmpxchg(&q->blk_trace, NULL, bt)) 5222db270a8SFrederic Weisbecker goto err; 5232db270a8SFrederic Weisbecker 52417ba97e3SLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 525cbe28296SLi Zefan blk_register_tracepoints(); 526cbe28296SLi Zefan 5272db270a8SFrederic Weisbecker return 0; 5282db270a8SFrederic Weisbecker err: 529ad5dd549SLi Zefan blk_trace_free(bt); 5302db270a8SFrederic Weisbecker return ret; 5312db270a8SFrederic Weisbecker } 5322db270a8SFrederic Weisbecker 5332db270a8SFrederic Weisbecker int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 534d0deef5bSShawn Du struct block_device *bdev, 5352db270a8SFrederic Weisbecker char __user *arg) 5362db270a8SFrederic Weisbecker { 5372db270a8SFrederic Weisbecker struct blk_user_trace_setup buts; 5382db270a8SFrederic Weisbecker int ret; 5392db270a8SFrederic Weisbecker 5402db270a8SFrederic Weisbecker ret = copy_from_user(&buts, arg, sizeof(buts)); 5412db270a8SFrederic Weisbecker if (ret) 5422db270a8SFrederic Weisbecker return -EFAULT; 5432db270a8SFrederic Weisbecker 544d0deef5bSShawn Du ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 5452db270a8SFrederic Weisbecker if (ret) 5462db270a8SFrederic Weisbecker return ret; 5472db270a8SFrederic Weisbecker 5489a8c28c8SDmitry Monakhov if (copy_to_user(arg, &buts, sizeof(buts))) { 5499a8c28c8SDmitry Monakhov blk_trace_remove(q); 5502db270a8SFrederic Weisbecker return -EFAULT; 5519a8c28c8SDmitry Monakhov } 5522db270a8SFrederic Weisbecker return 0; 5532db270a8SFrederic Weisbecker } 5542db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_setup); 5552db270a8SFrederic Weisbecker 55662c2a7d9SArnd Bergmann #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 55762c2a7d9SArnd Bergmann static int compat_blk_trace_setup(struct request_queue *q, char *name, 55862c2a7d9SArnd Bergmann dev_t dev, struct block_device *bdev, 55962c2a7d9SArnd Bergmann char __user *arg) 56062c2a7d9SArnd Bergmann { 56162c2a7d9SArnd Bergmann struct blk_user_trace_setup buts; 56262c2a7d9SArnd Bergmann struct compat_blk_user_trace_setup cbuts; 56362c2a7d9SArnd Bergmann int ret; 56462c2a7d9SArnd Bergmann 56562c2a7d9SArnd Bergmann if (copy_from_user(&cbuts, arg, sizeof(cbuts))) 56662c2a7d9SArnd Bergmann return -EFAULT; 56762c2a7d9SArnd Bergmann 56862c2a7d9SArnd Bergmann buts = (struct blk_user_trace_setup) { 56962c2a7d9SArnd Bergmann .act_mask = cbuts.act_mask, 57062c2a7d9SArnd Bergmann .buf_size = cbuts.buf_size, 57162c2a7d9SArnd Bergmann .buf_nr = cbuts.buf_nr, 57262c2a7d9SArnd Bergmann .start_lba = cbuts.start_lba, 57362c2a7d9SArnd Bergmann .end_lba = cbuts.end_lba, 57462c2a7d9SArnd Bergmann .pid = cbuts.pid, 57562c2a7d9SArnd Bergmann }; 57662c2a7d9SArnd Bergmann 57762c2a7d9SArnd Bergmann ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 57862c2a7d9SArnd Bergmann if (ret) 57962c2a7d9SArnd Bergmann return ret; 58062c2a7d9SArnd Bergmann 581f8c5e944SChen Gang if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) { 58262c2a7d9SArnd Bergmann blk_trace_remove(q); 58362c2a7d9SArnd Bergmann return -EFAULT; 58462c2a7d9SArnd Bergmann } 58562c2a7d9SArnd Bergmann 58662c2a7d9SArnd Bergmann return 0; 58762c2a7d9SArnd Bergmann } 58862c2a7d9SArnd Bergmann #endif 58962c2a7d9SArnd Bergmann 5902db270a8SFrederic Weisbecker int blk_trace_startstop(struct request_queue *q, int start) 5912db270a8SFrederic Weisbecker { 5922db270a8SFrederic Weisbecker int ret; 5932db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 5942db270a8SFrederic Weisbecker 5952db270a8SFrederic Weisbecker if (bt == NULL) 5962db270a8SFrederic Weisbecker return -EINVAL; 5972db270a8SFrederic Weisbecker 5982db270a8SFrederic Weisbecker /* 5992db270a8SFrederic Weisbecker * For starting a trace, we can transition from a setup or stopped 6002db270a8SFrederic Weisbecker * trace. For stopping a trace, the state must be running 6012db270a8SFrederic Weisbecker */ 6022db270a8SFrederic Weisbecker ret = -EINVAL; 6032db270a8SFrederic Weisbecker if (start) { 6042db270a8SFrederic Weisbecker if (bt->trace_state == Blktrace_setup || 6052db270a8SFrederic Weisbecker bt->trace_state == Blktrace_stopped) { 6062db270a8SFrederic Weisbecker blktrace_seq++; 6072db270a8SFrederic Weisbecker smp_mb(); 6082db270a8SFrederic Weisbecker bt->trace_state = Blktrace_running; 609a404d557SJan Kara spin_lock_irq(&running_trace_lock); 610a404d557SJan Kara list_add(&bt->running_list, &running_trace_list); 611a404d557SJan Kara spin_unlock_irq(&running_trace_lock); 6122db270a8SFrederic Weisbecker 6132db270a8SFrederic Weisbecker trace_note_time(bt); 6142db270a8SFrederic Weisbecker ret = 0; 6152db270a8SFrederic Weisbecker } 6162db270a8SFrederic Weisbecker } else { 6172db270a8SFrederic Weisbecker if (bt->trace_state == Blktrace_running) { 6182db270a8SFrederic Weisbecker bt->trace_state = Blktrace_stopped; 619a404d557SJan Kara spin_lock_irq(&running_trace_lock); 620a404d557SJan Kara list_del_init(&bt->running_list); 621a404d557SJan Kara spin_unlock_irq(&running_trace_lock); 6222db270a8SFrederic Weisbecker relay_flush(bt->rchan); 6232db270a8SFrederic Weisbecker ret = 0; 6242db270a8SFrederic Weisbecker } 6252db270a8SFrederic Weisbecker } 6262db270a8SFrederic Weisbecker 6272db270a8SFrederic Weisbecker return ret; 6282db270a8SFrederic Weisbecker } 6292db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_startstop); 6302db270a8SFrederic Weisbecker 6312db270a8SFrederic Weisbecker /** 6322db270a8SFrederic Weisbecker * blk_trace_ioctl: - handle the ioctls associated with tracing 6332db270a8SFrederic Weisbecker * @bdev: the block device 6342db270a8SFrederic Weisbecker * @cmd: the ioctl cmd 6352db270a8SFrederic Weisbecker * @arg: the argument data, if any 6362db270a8SFrederic Weisbecker * 6372db270a8SFrederic Weisbecker **/ 6382db270a8SFrederic Weisbecker int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) 6392db270a8SFrederic Weisbecker { 6402db270a8SFrederic Weisbecker struct request_queue *q; 6412db270a8SFrederic Weisbecker int ret, start = 0; 6422db270a8SFrederic Weisbecker char b[BDEVNAME_SIZE]; 6432db270a8SFrederic Weisbecker 6442db270a8SFrederic Weisbecker q = bdev_get_queue(bdev); 6452db270a8SFrederic Weisbecker if (!q) 6462db270a8SFrederic Weisbecker return -ENXIO; 6472db270a8SFrederic Weisbecker 6482db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 6492db270a8SFrederic Weisbecker 6502db270a8SFrederic Weisbecker switch (cmd) { 6512db270a8SFrederic Weisbecker case BLKTRACESETUP: 6522db270a8SFrederic Weisbecker bdevname(bdev, b); 653d0deef5bSShawn Du ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 6542db270a8SFrederic Weisbecker break; 65562c2a7d9SArnd Bergmann #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 65662c2a7d9SArnd Bergmann case BLKTRACESETUP32: 65762c2a7d9SArnd Bergmann bdevname(bdev, b); 65862c2a7d9SArnd Bergmann ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 65962c2a7d9SArnd Bergmann break; 66062c2a7d9SArnd Bergmann #endif 6612db270a8SFrederic Weisbecker case BLKTRACESTART: 6622db270a8SFrederic Weisbecker start = 1; 6632db270a8SFrederic Weisbecker case BLKTRACESTOP: 6642db270a8SFrederic Weisbecker ret = blk_trace_startstop(q, start); 6652db270a8SFrederic Weisbecker break; 6662db270a8SFrederic Weisbecker case BLKTRACETEARDOWN: 6672db270a8SFrederic Weisbecker ret = blk_trace_remove(q); 6682db270a8SFrederic Weisbecker break; 6692db270a8SFrederic Weisbecker default: 6702db270a8SFrederic Weisbecker ret = -ENOTTY; 6712db270a8SFrederic Weisbecker break; 6722db270a8SFrederic Weisbecker } 6732db270a8SFrederic Weisbecker 6742db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 6752db270a8SFrederic Weisbecker return ret; 6762db270a8SFrederic Weisbecker } 6772db270a8SFrederic Weisbecker 6782db270a8SFrederic Weisbecker /** 6792db270a8SFrederic Weisbecker * blk_trace_shutdown: - stop and cleanup trace structures 6802db270a8SFrederic Weisbecker * @q: the request queue associated with the device 6812db270a8SFrederic Weisbecker * 6822db270a8SFrederic Weisbecker **/ 6832db270a8SFrederic Weisbecker void blk_trace_shutdown(struct request_queue *q) 6842db270a8SFrederic Weisbecker { 6852db270a8SFrederic Weisbecker if (q->blk_trace) { 6862db270a8SFrederic Weisbecker blk_trace_startstop(q, 0); 6872db270a8SFrederic Weisbecker blk_trace_remove(q); 6882db270a8SFrederic Weisbecker } 6892db270a8SFrederic Weisbecker } 6902db270a8SFrederic Weisbecker 6912db270a8SFrederic Weisbecker /* 6922db270a8SFrederic Weisbecker * blktrace probes 6932db270a8SFrederic Weisbecker */ 6942db270a8SFrederic Weisbecker 6952db270a8SFrederic Weisbecker /** 6962db270a8SFrederic Weisbecker * blk_add_trace_rq - Add a trace for a request oriented action 6972db270a8SFrederic Weisbecker * @q: queue the io is for 6982db270a8SFrederic Weisbecker * @rq: the source request 699af5040daSRoman Pen * @nr_bytes: number of completed bytes 7002db270a8SFrederic Weisbecker * @what: the action 7012db270a8SFrederic Weisbecker * 7022db270a8SFrederic Weisbecker * Description: 7032db270a8SFrederic Weisbecker * Records an action against a request. Will log the bio offset + size. 7042db270a8SFrederic Weisbecker * 7052db270a8SFrederic Weisbecker **/ 7062db270a8SFrederic Weisbecker static void blk_add_trace_rq(struct request_queue *q, struct request *rq, 707af5040daSRoman Pen unsigned int nr_bytes, u32 what) 7082db270a8SFrederic Weisbecker { 7092db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7102db270a8SFrederic Weisbecker 7112db270a8SFrederic Weisbecker if (likely(!bt)) 7122db270a8SFrederic Weisbecker return; 7132db270a8SFrederic Weisbecker 71433659ebbSChristoph Hellwig if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 7152db270a8SFrederic Weisbecker what |= BLK_TC_ACT(BLK_TC_PC); 7161b9a9ab7SMike Christie __blk_add_trace(bt, 0, nr_bytes, req_op(rq), rq->cmd_flags, 7172e46e8b2STejun Heo what, rq->errors, rq->cmd_len, rq->cmd); 7182db270a8SFrederic Weisbecker } else { 7192db270a8SFrederic Weisbecker what |= BLK_TC_ACT(BLK_TC_FS); 7201b9a9ab7SMike Christie __blk_add_trace(bt, blk_rq_pos(rq), nr_bytes, req_op(rq), 721805f6b5eSTao Ma rq->cmd_flags, what, rq->errors, 0, NULL); 7222db270a8SFrederic Weisbecker } 7232db270a8SFrederic Weisbecker } 7242db270a8SFrederic Weisbecker 72538516ab5SSteven Rostedt static void blk_add_trace_rq_abort(void *ignore, 72638516ab5SSteven Rostedt struct request_queue *q, struct request *rq) 7272db270a8SFrederic Weisbecker { 728af5040daSRoman Pen blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_ABORT); 7292db270a8SFrederic Weisbecker } 7302db270a8SFrederic Weisbecker 73138516ab5SSteven Rostedt static void blk_add_trace_rq_insert(void *ignore, 73238516ab5SSteven Rostedt struct request_queue *q, struct request *rq) 7332db270a8SFrederic Weisbecker { 734af5040daSRoman Pen blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_INSERT); 7352db270a8SFrederic Weisbecker } 7362db270a8SFrederic Weisbecker 73738516ab5SSteven Rostedt static void blk_add_trace_rq_issue(void *ignore, 73838516ab5SSteven Rostedt struct request_queue *q, struct request *rq) 7392db270a8SFrederic Weisbecker { 740af5040daSRoman Pen blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_ISSUE); 7412db270a8SFrederic Weisbecker } 7422db270a8SFrederic Weisbecker 74338516ab5SSteven Rostedt static void blk_add_trace_rq_requeue(void *ignore, 74438516ab5SSteven Rostedt struct request_queue *q, 7452db270a8SFrederic Weisbecker struct request *rq) 7462db270a8SFrederic Weisbecker { 747af5040daSRoman Pen blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_REQUEUE); 7482db270a8SFrederic Weisbecker } 7492db270a8SFrederic Weisbecker 75038516ab5SSteven Rostedt static void blk_add_trace_rq_complete(void *ignore, 75138516ab5SSteven Rostedt struct request_queue *q, 752af5040daSRoman Pen struct request *rq, 753af5040daSRoman Pen unsigned int nr_bytes) 7542db270a8SFrederic Weisbecker { 755af5040daSRoman Pen blk_add_trace_rq(q, rq, nr_bytes, BLK_TA_COMPLETE); 7562db270a8SFrederic Weisbecker } 7572db270a8SFrederic Weisbecker 7582db270a8SFrederic Weisbecker /** 7592db270a8SFrederic Weisbecker * blk_add_trace_bio - Add a trace for a bio oriented action 7602db270a8SFrederic Weisbecker * @q: queue the io is for 7612db270a8SFrederic Weisbecker * @bio: the source bio 7622db270a8SFrederic Weisbecker * @what: the action 763797a455dSJens Axboe * @error: error, if any 7642db270a8SFrederic Weisbecker * 7652db270a8SFrederic Weisbecker * Description: 7662db270a8SFrederic Weisbecker * Records an action against a bio. Will log the bio offset + size. 7672db270a8SFrederic Weisbecker * 7682db270a8SFrederic Weisbecker **/ 7692db270a8SFrederic Weisbecker static void blk_add_trace_bio(struct request_queue *q, struct bio *bio, 770797a455dSJens Axboe u32 what, int error) 7712db270a8SFrederic Weisbecker { 7722db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7732db270a8SFrederic Weisbecker 7742db270a8SFrederic Weisbecker if (likely(!bt)) 7752db270a8SFrederic Weisbecker return; 7762db270a8SFrederic Weisbecker 7774f024f37SKent Overstreet __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, 7781b9a9ab7SMike Christie bio_op(bio), bio->bi_rw, what, error, 0, NULL); 7792db270a8SFrederic Weisbecker } 7802db270a8SFrederic Weisbecker 78138516ab5SSteven Rostedt static void blk_add_trace_bio_bounce(void *ignore, 78238516ab5SSteven Rostedt struct request_queue *q, struct bio *bio) 7832db270a8SFrederic Weisbecker { 784797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0); 7852db270a8SFrederic Weisbecker } 7862db270a8SFrederic Weisbecker 7870a82a8d1SLinus Torvalds static void blk_add_trace_bio_complete(void *ignore, 7880a82a8d1SLinus Torvalds struct request_queue *q, struct bio *bio, 7890a82a8d1SLinus Torvalds int error) 7902db270a8SFrederic Weisbecker { 791797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error); 7922db270a8SFrederic Weisbecker } 7932db270a8SFrederic Weisbecker 79438516ab5SSteven Rostedt static void blk_add_trace_bio_backmerge(void *ignore, 79538516ab5SSteven Rostedt struct request_queue *q, 7968c1cf6bbSTejun Heo struct request *rq, 7972db270a8SFrederic Weisbecker struct bio *bio) 7982db270a8SFrederic Weisbecker { 799797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0); 8002db270a8SFrederic Weisbecker } 8012db270a8SFrederic Weisbecker 80238516ab5SSteven Rostedt static void blk_add_trace_bio_frontmerge(void *ignore, 80338516ab5SSteven Rostedt struct request_queue *q, 8048c1cf6bbSTejun Heo struct request *rq, 8052db270a8SFrederic Weisbecker struct bio *bio) 8062db270a8SFrederic Weisbecker { 807797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0); 8082db270a8SFrederic Weisbecker } 8092db270a8SFrederic Weisbecker 81038516ab5SSteven Rostedt static void blk_add_trace_bio_queue(void *ignore, 81138516ab5SSteven Rostedt struct request_queue *q, struct bio *bio) 8122db270a8SFrederic Weisbecker { 813797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0); 8142db270a8SFrederic Weisbecker } 8152db270a8SFrederic Weisbecker 81638516ab5SSteven Rostedt static void blk_add_trace_getrq(void *ignore, 81738516ab5SSteven Rostedt struct request_queue *q, 8182db270a8SFrederic Weisbecker struct bio *bio, int rw) 8192db270a8SFrederic Weisbecker { 8202db270a8SFrederic Weisbecker if (bio) 821797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0); 8222db270a8SFrederic Weisbecker else { 8232db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8242db270a8SFrederic Weisbecker 8252db270a8SFrederic Weisbecker if (bt) 8261b9a9ab7SMike Christie __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_GETRQ, 0, 0, 8271b9a9ab7SMike Christie NULL); 8282db270a8SFrederic Weisbecker } 8292db270a8SFrederic Weisbecker } 8302db270a8SFrederic Weisbecker 8312db270a8SFrederic Weisbecker 83238516ab5SSteven Rostedt static void blk_add_trace_sleeprq(void *ignore, 83338516ab5SSteven Rostedt struct request_queue *q, 8342db270a8SFrederic Weisbecker struct bio *bio, int rw) 8352db270a8SFrederic Weisbecker { 8362db270a8SFrederic Weisbecker if (bio) 837797a455dSJens Axboe blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0); 8382db270a8SFrederic Weisbecker else { 8392db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8402db270a8SFrederic Weisbecker 8412db270a8SFrederic Weisbecker if (bt) 8421b9a9ab7SMike Christie __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_SLEEPRQ, 8432db270a8SFrederic Weisbecker 0, 0, NULL); 8442db270a8SFrederic Weisbecker } 8452db270a8SFrederic Weisbecker } 8462db270a8SFrederic Weisbecker 84738516ab5SSteven Rostedt static void blk_add_trace_plug(void *ignore, struct request_queue *q) 8482db270a8SFrederic Weisbecker { 8492db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8502db270a8SFrederic Weisbecker 8512db270a8SFrederic Weisbecker if (bt) 8521b9a9ab7SMike Christie __blk_add_trace(bt, 0, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL); 8532db270a8SFrederic Weisbecker } 8542db270a8SFrederic Weisbecker 85549cac01eSJens Axboe static void blk_add_trace_unplug(void *ignore, struct request_queue *q, 85649cac01eSJens Axboe unsigned int depth, bool explicit) 8572db270a8SFrederic Weisbecker { 8582db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8592db270a8SFrederic Weisbecker 8602db270a8SFrederic Weisbecker if (bt) { 86194b5eb28SJens Axboe __be64 rpdu = cpu_to_be64(depth); 86249cac01eSJens Axboe u32 what; 8632db270a8SFrederic Weisbecker 86449cac01eSJens Axboe if (explicit) 86549cac01eSJens Axboe what = BLK_TA_UNPLUG_IO; 86649cac01eSJens Axboe else 86749cac01eSJens Axboe what = BLK_TA_UNPLUG_TIMER; 86849cac01eSJens Axboe 8691b9a9ab7SMike Christie __blk_add_trace(bt, 0, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu); 8702db270a8SFrederic Weisbecker } 8712db270a8SFrederic Weisbecker } 8722db270a8SFrederic Weisbecker 87338516ab5SSteven Rostedt static void blk_add_trace_split(void *ignore, 87438516ab5SSteven Rostedt struct request_queue *q, struct bio *bio, 8752db270a8SFrederic Weisbecker unsigned int pdu) 8762db270a8SFrederic Weisbecker { 8772db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8782db270a8SFrederic Weisbecker 8792db270a8SFrederic Weisbecker if (bt) { 8802db270a8SFrederic Weisbecker __be64 rpdu = cpu_to_be64(pdu); 8812db270a8SFrederic Weisbecker 8824f024f37SKent Overstreet __blk_add_trace(bt, bio->bi_iter.bi_sector, 8831b9a9ab7SMike Christie bio->bi_iter.bi_size, bio_op(bio), bio->bi_rw, 8841b9a9ab7SMike Christie BLK_TA_SPLIT, bio->bi_error, sizeof(rpdu), 8851b9a9ab7SMike Christie &rpdu); 8862db270a8SFrederic Weisbecker } 8872db270a8SFrederic Weisbecker } 8882db270a8SFrederic Weisbecker 8892db270a8SFrederic Weisbecker /** 890d07335e5SMike Snitzer * blk_add_trace_bio_remap - Add a trace for a bio-remap operation 891546cf44aSRandy Dunlap * @ignore: trace callback data parameter (not used) 8922db270a8SFrederic Weisbecker * @q: queue the io is for 8932db270a8SFrederic Weisbecker * @bio: the source bio 8942db270a8SFrederic Weisbecker * @dev: target device 895a42aaa3bSAlan D. Brunelle * @from: source sector 8962db270a8SFrederic Weisbecker * 8972db270a8SFrederic Weisbecker * Description: 8982db270a8SFrederic Weisbecker * Device mapper or raid target sometimes need to split a bio because 8992db270a8SFrederic Weisbecker * it spans a stripe (or similar). Add a trace for that action. 9002db270a8SFrederic Weisbecker * 9012db270a8SFrederic Weisbecker **/ 902d07335e5SMike Snitzer static void blk_add_trace_bio_remap(void *ignore, 90338516ab5SSteven Rostedt struct request_queue *q, struct bio *bio, 90422a7c31aSAlan D. Brunelle dev_t dev, sector_t from) 9052db270a8SFrederic Weisbecker { 9062db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 9072db270a8SFrederic Weisbecker struct blk_io_trace_remap r; 9082db270a8SFrederic Weisbecker 9092db270a8SFrederic Weisbecker if (likely(!bt)) 9102db270a8SFrederic Weisbecker return; 9112db270a8SFrederic Weisbecker 912a42aaa3bSAlan D. Brunelle r.device_from = cpu_to_be32(dev); 913a42aaa3bSAlan D. Brunelle r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev); 914a42aaa3bSAlan D. Brunelle r.sector_from = cpu_to_be64(from); 9152db270a8SFrederic Weisbecker 9164f024f37SKent Overstreet __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, 9171b9a9ab7SMike Christie bio_op(bio), bio->bi_rw, BLK_TA_REMAP, bio->bi_error, 9184246a0b6SChristoph Hellwig sizeof(r), &r); 9192db270a8SFrederic Weisbecker } 9202db270a8SFrederic Weisbecker 9212db270a8SFrederic Weisbecker /** 922b0da3f0dSJun'ichi Nomura * blk_add_trace_rq_remap - Add a trace for a request-remap operation 923546cf44aSRandy Dunlap * @ignore: trace callback data parameter (not used) 924b0da3f0dSJun'ichi Nomura * @q: queue the io is for 925b0da3f0dSJun'ichi Nomura * @rq: the source request 926b0da3f0dSJun'ichi Nomura * @dev: target device 927b0da3f0dSJun'ichi Nomura * @from: source sector 928b0da3f0dSJun'ichi Nomura * 929b0da3f0dSJun'ichi Nomura * Description: 930b0da3f0dSJun'ichi Nomura * Device mapper remaps request to other devices. 931b0da3f0dSJun'ichi Nomura * Add a trace for that action. 932b0da3f0dSJun'ichi Nomura * 933b0da3f0dSJun'ichi Nomura **/ 93438516ab5SSteven Rostedt static void blk_add_trace_rq_remap(void *ignore, 93538516ab5SSteven Rostedt struct request_queue *q, 936b0da3f0dSJun'ichi Nomura struct request *rq, dev_t dev, 937b0da3f0dSJun'ichi Nomura sector_t from) 938b0da3f0dSJun'ichi Nomura { 939b0da3f0dSJun'ichi Nomura struct blk_trace *bt = q->blk_trace; 940b0da3f0dSJun'ichi Nomura struct blk_io_trace_remap r; 941b0da3f0dSJun'ichi Nomura 942b0da3f0dSJun'ichi Nomura if (likely(!bt)) 943b0da3f0dSJun'ichi Nomura return; 944b0da3f0dSJun'ichi Nomura 945b0da3f0dSJun'ichi Nomura r.device_from = cpu_to_be32(dev); 946b0da3f0dSJun'ichi Nomura r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); 947b0da3f0dSJun'ichi Nomura r.sector_from = cpu_to_be64(from); 948b0da3f0dSJun'ichi Nomura 949b0da3f0dSJun'ichi Nomura __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 9501b9a9ab7SMike Christie rq_data_dir(rq), 0, BLK_TA_REMAP, !!rq->errors, 951b0da3f0dSJun'ichi Nomura sizeof(r), &r); 952b0da3f0dSJun'ichi Nomura } 953b0da3f0dSJun'ichi Nomura 954b0da3f0dSJun'ichi Nomura /** 9552db270a8SFrederic Weisbecker * blk_add_driver_data - Add binary message with driver-specific data 9562db270a8SFrederic Weisbecker * @q: queue the io is for 9572db270a8SFrederic Weisbecker * @rq: io request 9582db270a8SFrederic Weisbecker * @data: driver-specific data 9592db270a8SFrederic Weisbecker * @len: length of driver-specific data 9602db270a8SFrederic Weisbecker * 9612db270a8SFrederic Weisbecker * Description: 9622db270a8SFrederic Weisbecker * Some drivers might want to write driver-specific data per request. 9632db270a8SFrederic Weisbecker * 9642db270a8SFrederic Weisbecker **/ 9652db270a8SFrederic Weisbecker void blk_add_driver_data(struct request_queue *q, 9662db270a8SFrederic Weisbecker struct request *rq, 9672db270a8SFrederic Weisbecker void *data, size_t len) 9682db270a8SFrederic Weisbecker { 9692db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 9702db270a8SFrederic Weisbecker 9712db270a8SFrederic Weisbecker if (likely(!bt)) 9722db270a8SFrederic Weisbecker return; 9732db270a8SFrederic Weisbecker 97433659ebbSChristoph Hellwig if (rq->cmd_type == REQ_TYPE_BLOCK_PC) 9751b9a9ab7SMike Christie __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 0, 9762e46e8b2STejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9772db270a8SFrederic Weisbecker else 9781b9a9ab7SMike Christie __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 0, 9792e46e8b2STejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9802db270a8SFrederic Weisbecker } 9812db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_add_driver_data); 9822db270a8SFrederic Weisbecker 9833c289ba7SLi Zefan static void blk_register_tracepoints(void) 9842db270a8SFrederic Weisbecker { 9852db270a8SFrederic Weisbecker int ret; 9862db270a8SFrederic Weisbecker 98738516ab5SSteven Rostedt ret = register_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); 9882db270a8SFrederic Weisbecker WARN_ON(ret); 98938516ab5SSteven Rostedt ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); 9902db270a8SFrederic Weisbecker WARN_ON(ret); 99138516ab5SSteven Rostedt ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); 9922db270a8SFrederic Weisbecker WARN_ON(ret); 99338516ab5SSteven Rostedt ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); 9942db270a8SFrederic Weisbecker WARN_ON(ret); 99538516ab5SSteven Rostedt ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); 9962db270a8SFrederic Weisbecker WARN_ON(ret); 99738516ab5SSteven Rostedt ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); 9982db270a8SFrederic Weisbecker WARN_ON(ret); 99938516ab5SSteven Rostedt ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); 10002db270a8SFrederic Weisbecker WARN_ON(ret); 100138516ab5SSteven Rostedt ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); 10022db270a8SFrederic Weisbecker WARN_ON(ret); 100338516ab5SSteven Rostedt ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); 10042db270a8SFrederic Weisbecker WARN_ON(ret); 100538516ab5SSteven Rostedt ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); 10062db270a8SFrederic Weisbecker WARN_ON(ret); 100738516ab5SSteven Rostedt ret = register_trace_block_getrq(blk_add_trace_getrq, NULL); 10082db270a8SFrederic Weisbecker WARN_ON(ret); 100938516ab5SSteven Rostedt ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); 10102db270a8SFrederic Weisbecker WARN_ON(ret); 101138516ab5SSteven Rostedt ret = register_trace_block_plug(blk_add_trace_plug, NULL); 10122db270a8SFrederic Weisbecker WARN_ON(ret); 101349cac01eSJens Axboe ret = register_trace_block_unplug(blk_add_trace_unplug, NULL); 10142db270a8SFrederic Weisbecker WARN_ON(ret); 101538516ab5SSteven Rostedt ret = register_trace_block_split(blk_add_trace_split, NULL); 10162db270a8SFrederic Weisbecker WARN_ON(ret); 1017d07335e5SMike Snitzer ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); 10182db270a8SFrederic Weisbecker WARN_ON(ret); 101938516ab5SSteven Rostedt ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); 1020b0da3f0dSJun'ichi Nomura WARN_ON(ret); 10212db270a8SFrederic Weisbecker } 10222db270a8SFrederic Weisbecker 10232db270a8SFrederic Weisbecker static void blk_unregister_tracepoints(void) 10242db270a8SFrederic Weisbecker { 102538516ab5SSteven Rostedt unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); 1026d07335e5SMike Snitzer unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL); 102738516ab5SSteven Rostedt unregister_trace_block_split(blk_add_trace_split, NULL); 102849cac01eSJens Axboe unregister_trace_block_unplug(blk_add_trace_unplug, NULL); 102938516ab5SSteven Rostedt unregister_trace_block_plug(blk_add_trace_plug, NULL); 103038516ab5SSteven Rostedt unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); 103138516ab5SSteven Rostedt unregister_trace_block_getrq(blk_add_trace_getrq, NULL); 103238516ab5SSteven Rostedt unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); 103338516ab5SSteven Rostedt unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); 103438516ab5SSteven Rostedt unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); 103538516ab5SSteven Rostedt unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); 103638516ab5SSteven Rostedt unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); 103738516ab5SSteven Rostedt unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); 103838516ab5SSteven Rostedt unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); 103938516ab5SSteven Rostedt unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); 104038516ab5SSteven Rostedt unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); 104138516ab5SSteven Rostedt unregister_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); 10422db270a8SFrederic Weisbecker 10432db270a8SFrederic Weisbecker tracepoint_synchronize_unregister(); 10442db270a8SFrederic Weisbecker } 10452db270a8SFrederic Weisbecker 10462db270a8SFrederic Weisbecker /* 10472db270a8SFrederic Weisbecker * struct blk_io_tracer formatting routines 10482db270a8SFrederic Weisbecker */ 10492db270a8SFrederic Weisbecker 10502db270a8SFrederic Weisbecker static void fill_rwbs(char *rwbs, const struct blk_io_trace *t) 10512db270a8SFrederic Weisbecker { 10522db270a8SFrederic Weisbecker int i = 0; 105365796348SLi Zefan int tc = t->action >> BLK_TC_SHIFT; 10542db270a8SFrederic Weisbecker 105518cea459SLi Zefan if (t->action == BLK_TN_MESSAGE) { 105618cea459SLi Zefan rwbs[i++] = 'N'; 105718cea459SLi Zefan goto out; 105818cea459SLi Zefan } 105918cea459SLi Zefan 1060c09c47caSNamhyung Kim if (tc & BLK_TC_FLUSH) 1061c09c47caSNamhyung Kim rwbs[i++] = 'F'; 1062c09c47caSNamhyung Kim 106365796348SLi Zefan if (tc & BLK_TC_DISCARD) 10642db270a8SFrederic Weisbecker rwbs[i++] = 'D'; 106565796348SLi Zefan else if (tc & BLK_TC_WRITE) 10662db270a8SFrederic Weisbecker rwbs[i++] = 'W'; 10672db270a8SFrederic Weisbecker else if (t->bytes) 10682db270a8SFrederic Weisbecker rwbs[i++] = 'R'; 10692db270a8SFrederic Weisbecker else 10702db270a8SFrederic Weisbecker rwbs[i++] = 'N'; 10712db270a8SFrederic Weisbecker 1072c09c47caSNamhyung Kim if (tc & BLK_TC_FUA) 1073c09c47caSNamhyung Kim rwbs[i++] = 'F'; 107465796348SLi Zefan if (tc & BLK_TC_AHEAD) 10752db270a8SFrederic Weisbecker rwbs[i++] = 'A'; 107665796348SLi Zefan if (tc & BLK_TC_SYNC) 10772db270a8SFrederic Weisbecker rwbs[i++] = 'S'; 107865796348SLi Zefan if (tc & BLK_TC_META) 10792db270a8SFrederic Weisbecker rwbs[i++] = 'M'; 108018cea459SLi Zefan out: 10812db270a8SFrederic Weisbecker rwbs[i] = '\0'; 10822db270a8SFrederic Weisbecker } 10832db270a8SFrederic Weisbecker 10842db270a8SFrederic Weisbecker static inline 10852db270a8SFrederic Weisbecker const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) 10862db270a8SFrederic Weisbecker { 10872db270a8SFrederic Weisbecker return (const struct blk_io_trace *)ent; 10882db270a8SFrederic Weisbecker } 10892db270a8SFrederic Weisbecker 10902db270a8SFrederic Weisbecker static inline const void *pdu_start(const struct trace_entry *ent) 10912db270a8SFrederic Weisbecker { 10922db270a8SFrederic Weisbecker return te_blk_io_trace(ent) + 1; 10932db270a8SFrederic Weisbecker } 10942db270a8SFrederic Weisbecker 109566de7792SLi Zefan static inline u32 t_action(const struct trace_entry *ent) 109666de7792SLi Zefan { 109766de7792SLi Zefan return te_blk_io_trace(ent)->action; 109866de7792SLi Zefan } 109966de7792SLi Zefan 110066de7792SLi Zefan static inline u32 t_bytes(const struct trace_entry *ent) 110166de7792SLi Zefan { 110266de7792SLi Zefan return te_blk_io_trace(ent)->bytes; 110366de7792SLi Zefan } 110466de7792SLi Zefan 11052db270a8SFrederic Weisbecker static inline u32 t_sec(const struct trace_entry *ent) 11062db270a8SFrederic Weisbecker { 11072db270a8SFrederic Weisbecker return te_blk_io_trace(ent)->bytes >> 9; 11082db270a8SFrederic Weisbecker } 11092db270a8SFrederic Weisbecker 11102db270a8SFrederic Weisbecker static inline unsigned long long t_sector(const struct trace_entry *ent) 11112db270a8SFrederic Weisbecker { 11122db270a8SFrederic Weisbecker return te_blk_io_trace(ent)->sector; 11132db270a8SFrederic Weisbecker } 11142db270a8SFrederic Weisbecker 11152db270a8SFrederic Weisbecker static inline __u16 t_error(const struct trace_entry *ent) 11162db270a8SFrederic Weisbecker { 1117e0dc81beSLi Zefan return te_blk_io_trace(ent)->error; 11182db270a8SFrederic Weisbecker } 11192db270a8SFrederic Weisbecker 11202db270a8SFrederic Weisbecker static __u64 get_pdu_int(const struct trace_entry *ent) 11212db270a8SFrederic Weisbecker { 11222db270a8SFrederic Weisbecker const __u64 *val = pdu_start(ent); 11232db270a8SFrederic Weisbecker return be64_to_cpu(*val); 11242db270a8SFrederic Weisbecker } 11252db270a8SFrederic Weisbecker 11262db270a8SFrederic Weisbecker static void get_pdu_remap(const struct trace_entry *ent, 11272db270a8SFrederic Weisbecker struct blk_io_trace_remap *r) 11282db270a8SFrederic Weisbecker { 11292db270a8SFrederic Weisbecker const struct blk_io_trace_remap *__r = pdu_start(ent); 1130a42aaa3bSAlan D. Brunelle __u64 sector_from = __r->sector_from; 11312db270a8SFrederic Weisbecker 11322db270a8SFrederic Weisbecker r->device_from = be32_to_cpu(__r->device_from); 1133a42aaa3bSAlan D. Brunelle r->device_to = be32_to_cpu(__r->device_to); 1134a42aaa3bSAlan D. Brunelle r->sector_from = be64_to_cpu(sector_from); 11352db270a8SFrederic Weisbecker } 11362db270a8SFrederic Weisbecker 1137f4a1d08cSSteven Rostedt (Red Hat) typedef void (blk_log_action_t) (struct trace_iterator *iter, const char *act); 1138b6a4b0c3SLi Zefan 1139f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_action_classic(struct trace_iterator *iter, const char *act) 11402db270a8SFrederic Weisbecker { 1141c09c47caSNamhyung Kim char rwbs[RWBS_LEN]; 114235ac51bfSLi Zefan unsigned long long ts = iter->ts; 114335ac51bfSLi Zefan unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); 11442db270a8SFrederic Weisbecker unsigned secs = (unsigned long)ts; 1145b6a4b0c3SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 11462db270a8SFrederic Weisbecker 11472db270a8SFrederic Weisbecker fill_rwbs(rwbs, t); 11482db270a8SFrederic Weisbecker 1149f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(&iter->seq, 115035ac51bfSLi Zefan "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", 11512db270a8SFrederic Weisbecker MAJOR(t->device), MINOR(t->device), iter->cpu, 1152b6a4b0c3SLi Zefan secs, nsec_rem, iter->ent->pid, act, rwbs); 11532db270a8SFrederic Weisbecker } 11542db270a8SFrederic Weisbecker 1155f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_action(struct trace_iterator *iter, const char *act) 11562db270a8SFrederic Weisbecker { 1157c09c47caSNamhyung Kim char rwbs[RWBS_LEN]; 1158b6a4b0c3SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1159b6a4b0c3SLi Zefan 11602db270a8SFrederic Weisbecker fill_rwbs(rwbs, t); 1161f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", 11622db270a8SFrederic Weisbecker MAJOR(t->device), MINOR(t->device), act, rwbs); 11632db270a8SFrederic Weisbecker } 11642db270a8SFrederic Weisbecker 1165f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent) 116666de7792SLi Zefan { 116704986257SLi Zefan const unsigned char *pdu_buf; 116866de7792SLi Zefan int pdu_len; 1169f4a1d08cSSteven Rostedt (Red Hat) int i, end; 117066de7792SLi Zefan 117166de7792SLi Zefan pdu_buf = pdu_start(ent); 117266de7792SLi Zefan pdu_len = te_blk_io_trace(ent)->pdu_len; 117366de7792SLi Zefan 117466de7792SLi Zefan if (!pdu_len) 1175f4a1d08cSSteven Rostedt (Red Hat) return; 117666de7792SLi Zefan 117766de7792SLi Zefan /* find the last zero that needs to be printed */ 117866de7792SLi Zefan for (end = pdu_len - 1; end >= 0; end--) 117966de7792SLi Zefan if (pdu_buf[end]) 118066de7792SLi Zefan break; 118166de7792SLi Zefan end++; 118266de7792SLi Zefan 1183f4a1d08cSSteven Rostedt (Red Hat) trace_seq_putc(s, '('); 118466de7792SLi Zefan 118566de7792SLi Zefan for (i = 0; i < pdu_len; i++) { 118666de7792SLi Zefan 1187f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%s%02x", 118866de7792SLi Zefan i == 0 ? "" : " ", pdu_buf[i]); 118966de7792SLi Zefan 119066de7792SLi Zefan /* 119166de7792SLi Zefan * stop when the rest is just zeroes and indicate so 119266de7792SLi Zefan * with a ".." appended 119366de7792SLi Zefan */ 1194f4a1d08cSSteven Rostedt (Red Hat) if (i == end && end != pdu_len - 1) { 1195f4a1d08cSSteven Rostedt (Red Hat) trace_seq_puts(s, " ..) "); 1196f4a1d08cSSteven Rostedt (Red Hat) return; 1197f4a1d08cSSteven Rostedt (Red Hat) } 119866de7792SLi Zefan } 119966de7792SLi Zefan 1200f4a1d08cSSteven Rostedt (Red Hat) trace_seq_puts(s, ") "); 120166de7792SLi Zefan } 120266de7792SLi Zefan 1203f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_generic(struct trace_seq *s, const struct trace_entry *ent) 12042db270a8SFrederic Weisbecker { 12054ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12064ca53085SSteven Rostedt 12074ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12082db270a8SFrederic Weisbecker 120966de7792SLi Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 1210f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%u ", t_bytes(ent)); 1211f4a1d08cSSteven Rostedt (Red Hat) blk_log_dump_pdu(s, ent); 1212f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "[%s]\n", cmd); 121366de7792SLi Zefan } else { 12142db270a8SFrederic Weisbecker if (t_sec(ent)) 1215f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%llu + %u [%s]\n", 12162db270a8SFrederic Weisbecker t_sector(ent), t_sec(ent), cmd); 1217f4a1d08cSSteven Rostedt (Red Hat) else 1218f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "[%s]\n", cmd); 12192db270a8SFrederic Weisbecker } 122066de7792SLi Zefan } 12212db270a8SFrederic Weisbecker 1222f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_with_error(struct trace_seq *s, 12232db270a8SFrederic Weisbecker const struct trace_entry *ent) 12242db270a8SFrederic Weisbecker { 122566de7792SLi Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 1226f4a1d08cSSteven Rostedt (Red Hat) blk_log_dump_pdu(s, ent); 1227f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "[%d]\n", t_error(ent)); 122866de7792SLi Zefan } else { 12292db270a8SFrederic Weisbecker if (t_sec(ent)) 1230f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%llu + %u [%d]\n", 123166de7792SLi Zefan t_sector(ent), 12322db270a8SFrederic Weisbecker t_sec(ent), t_error(ent)); 1233f4a1d08cSSteven Rostedt (Red Hat) else 1234f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%llu [%d]\n", 123566de7792SLi Zefan t_sector(ent), t_error(ent)); 123666de7792SLi Zefan } 12372db270a8SFrederic Weisbecker } 12382db270a8SFrederic Weisbecker 1239f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_remap(struct trace_seq *s, const struct trace_entry *ent) 12402db270a8SFrederic Weisbecker { 1241a42aaa3bSAlan D. Brunelle struct blk_io_trace_remap r = { .device_from = 0, }; 12422db270a8SFrederic Weisbecker 12432db270a8SFrederic Weisbecker get_pdu_remap(ent, &r); 1244f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", 1245a42aaa3bSAlan D. Brunelle t_sector(ent), t_sec(ent), 1246a42aaa3bSAlan D. Brunelle MAJOR(r.device_from), MINOR(r.device_from), 1247a42aaa3bSAlan D. Brunelle (unsigned long long)r.sector_from); 12482db270a8SFrederic Weisbecker } 12492db270a8SFrederic Weisbecker 1250f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_plug(struct trace_seq *s, const struct trace_entry *ent) 12512db270a8SFrederic Weisbecker { 12524ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12534ca53085SSteven Rostedt 12544ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12554ca53085SSteven Rostedt 1256f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "[%s]\n", cmd); 12572db270a8SFrederic Weisbecker } 12582db270a8SFrederic Weisbecker 1259f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent) 12602db270a8SFrederic Weisbecker { 12614ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12624ca53085SSteven Rostedt 12634ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12644ca53085SSteven Rostedt 1265f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent)); 12662db270a8SFrederic Weisbecker } 12672db270a8SFrederic Weisbecker 1268f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_split(struct trace_seq *s, const struct trace_entry *ent) 12692db270a8SFrederic Weisbecker { 12704ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12714ca53085SSteven Rostedt 12724ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12734ca53085SSteven Rostedt 1274f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), 12754ca53085SSteven Rostedt get_pdu_int(ent), cmd); 12762db270a8SFrederic Weisbecker } 12772db270a8SFrederic Weisbecker 1278f4a1d08cSSteven Rostedt (Red Hat) static void blk_log_msg(struct trace_seq *s, const struct trace_entry *ent) 127918cea459SLi Zefan { 128018cea459SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(ent); 128118cea459SLi Zefan 1282f4a1d08cSSteven Rostedt (Red Hat) trace_seq_putmem(s, t + 1, t->pdu_len); 1283f4a1d08cSSteven Rostedt (Red Hat) trace_seq_putc(s, '\n'); 128418cea459SLi Zefan } 128518cea459SLi Zefan 12862db270a8SFrederic Weisbecker /* 12872db270a8SFrederic Weisbecker * struct tracer operations 12882db270a8SFrederic Weisbecker */ 12892db270a8SFrederic Weisbecker 12902db270a8SFrederic Weisbecker static void blk_tracer_print_header(struct seq_file *m) 12912db270a8SFrederic Weisbecker { 12922db270a8SFrederic Weisbecker if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 12932db270a8SFrederic Weisbecker return; 12942db270a8SFrederic Weisbecker seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" 12952db270a8SFrederic Weisbecker "# | | | | | |\n"); 12962db270a8SFrederic Weisbecker } 12972db270a8SFrederic Weisbecker 12982db270a8SFrederic Weisbecker static void blk_tracer_start(struct trace_array *tr) 12992db270a8SFrederic Weisbecker { 1300ad5dd549SLi Zefan blk_tracer_enabled = true; 13012db270a8SFrederic Weisbecker } 13022db270a8SFrederic Weisbecker 13032db270a8SFrederic Weisbecker static int blk_tracer_init(struct trace_array *tr) 13042db270a8SFrederic Weisbecker { 13052db270a8SFrederic Weisbecker blk_tr = tr; 13062db270a8SFrederic Weisbecker blk_tracer_start(tr); 13072db270a8SFrederic Weisbecker return 0; 13082db270a8SFrederic Weisbecker } 13092db270a8SFrederic Weisbecker 13102db270a8SFrederic Weisbecker static void blk_tracer_stop(struct trace_array *tr) 13112db270a8SFrederic Weisbecker { 1312ad5dd549SLi Zefan blk_tracer_enabled = false; 13132db270a8SFrederic Weisbecker } 13142db270a8SFrederic Weisbecker 13152db270a8SFrederic Weisbecker static void blk_tracer_reset(struct trace_array *tr) 13162db270a8SFrederic Weisbecker { 13172db270a8SFrederic Weisbecker blk_tracer_stop(tr); 13182db270a8SFrederic Weisbecker } 13192db270a8SFrederic Weisbecker 1320e4955c99SLi Zefan static const struct { 13212db270a8SFrederic Weisbecker const char *act[2]; 1322f4a1d08cSSteven Rostedt (Red Hat) void (*print)(struct trace_seq *s, const struct trace_entry *ent); 1323e4955c99SLi Zefan } what2act[] = { 13242db270a8SFrederic Weisbecker [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, 13252db270a8SFrederic Weisbecker [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, 13262db270a8SFrederic Weisbecker [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, 13272db270a8SFrederic Weisbecker [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, 13282db270a8SFrederic Weisbecker [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, 13292db270a8SFrederic Weisbecker [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, 13302db270a8SFrederic Weisbecker [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, 13312db270a8SFrederic Weisbecker [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, 13322db270a8SFrederic Weisbecker [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, 13332db270a8SFrederic Weisbecker [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, 133449cac01eSJens Axboe [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, 13352db270a8SFrederic Weisbecker [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, 13362db270a8SFrederic Weisbecker [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, 13372db270a8SFrederic Weisbecker [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, 13382db270a8SFrederic Weisbecker [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, 13392db270a8SFrederic Weisbecker }; 13402db270a8SFrederic Weisbecker 1341b6a4b0c3SLi Zefan static enum print_line_t print_one_line(struct trace_iterator *iter, 1342b6a4b0c3SLi Zefan bool classic) 13432db270a8SFrederic Weisbecker { 1344983f938aSSteven Rostedt (Red Hat) struct trace_array *tr = iter->tr; 13452db270a8SFrederic Weisbecker struct trace_seq *s = &iter->seq; 1346b6a4b0c3SLi Zefan const struct blk_io_trace *t; 1347b6a4b0c3SLi Zefan u16 what; 1348b6a4b0c3SLi Zefan bool long_act; 1349b6a4b0c3SLi Zefan blk_log_action_t *log_action; 13502db270a8SFrederic Weisbecker 1351b6a4b0c3SLi Zefan t = te_blk_io_trace(iter->ent); 1352b6a4b0c3SLi Zefan what = t->action & ((1 << BLK_TC_SHIFT) - 1); 1353983f938aSSteven Rostedt (Red Hat) long_act = !!(tr->trace_flags & TRACE_ITER_VERBOSE); 1354b6a4b0c3SLi Zefan log_action = classic ? &blk_log_action_classic : &blk_log_action; 13552db270a8SFrederic Weisbecker 135618cea459SLi Zefan if (t->action == BLK_TN_MESSAGE) { 1357f4a1d08cSSteven Rostedt (Red Hat) log_action(iter, long_act ? "message" : "m"); 1358f4a1d08cSSteven Rostedt (Red Hat) blk_log_msg(s, iter->ent); 1359b7d7641eSShaohua Li return trace_handle_return(s); 136018cea459SLi Zefan } 136118cea459SLi Zefan 1362eb08f8ebSLi Zefan if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) 1363f4a1d08cSSteven Rostedt (Red Hat) trace_seq_printf(s, "Unknown action %x\n", what); 13642db270a8SFrederic Weisbecker else { 1365f4a1d08cSSteven Rostedt (Red Hat) log_action(iter, what2act[what].act[long_act]); 1366f4a1d08cSSteven Rostedt (Red Hat) what2act[what].print(s, iter->ent); 13672db270a8SFrederic Weisbecker } 1368f4a1d08cSSteven Rostedt (Red Hat) 1369f4a1d08cSSteven Rostedt (Red Hat) return trace_handle_return(s); 13702db270a8SFrederic Weisbecker } 13712db270a8SFrederic Weisbecker 1372b6a4b0c3SLi Zefan static enum print_line_t blk_trace_event_print(struct trace_iterator *iter, 1373a9a57763SSteven Rostedt int flags, struct trace_event *event) 1374b6a4b0c3SLi Zefan { 1375b6a4b0c3SLi Zefan return print_one_line(iter, false); 1376b6a4b0c3SLi Zefan } 1377b6a4b0c3SLi Zefan 1378f4a1d08cSSteven Rostedt (Red Hat) static void blk_trace_synthesize_old_trace(struct trace_iterator *iter) 13792db270a8SFrederic Weisbecker { 13802db270a8SFrederic Weisbecker struct trace_seq *s = &iter->seq; 13812db270a8SFrederic Weisbecker struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; 13822db270a8SFrederic Weisbecker const int offset = offsetof(struct blk_io_trace, sector); 13832db270a8SFrederic Weisbecker struct blk_io_trace old = { 13842db270a8SFrederic Weisbecker .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, 13856c051ce0SLi Zefan .time = iter->ts, 13862db270a8SFrederic Weisbecker }; 13872db270a8SFrederic Weisbecker 1388f4a1d08cSSteven Rostedt (Red Hat) trace_seq_putmem(s, &old, offset); 1389f4a1d08cSSteven Rostedt (Red Hat) trace_seq_putmem(s, &t->sector, 13902db270a8SFrederic Weisbecker sizeof(old) - offset + t->pdu_len); 13912db270a8SFrederic Weisbecker } 13922db270a8SFrederic Weisbecker 13932db270a8SFrederic Weisbecker static enum print_line_t 1394a9a57763SSteven Rostedt blk_trace_event_print_binary(struct trace_iterator *iter, int flags, 1395a9a57763SSteven Rostedt struct trace_event *event) 13962db270a8SFrederic Weisbecker { 1397f4a1d08cSSteven Rostedt (Red Hat) blk_trace_synthesize_old_trace(iter); 1398f4a1d08cSSteven Rostedt (Red Hat) 1399f4a1d08cSSteven Rostedt (Red Hat) return trace_handle_return(&iter->seq); 14002db270a8SFrederic Weisbecker } 14012db270a8SFrederic Weisbecker 14022db270a8SFrederic Weisbecker static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) 14032db270a8SFrederic Weisbecker { 14042db270a8SFrederic Weisbecker if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 14052db270a8SFrederic Weisbecker return TRACE_TYPE_UNHANDLED; 14062db270a8SFrederic Weisbecker 1407b6a4b0c3SLi Zefan return print_one_line(iter, true); 14082db270a8SFrederic Weisbecker } 14092db270a8SFrederic Weisbecker 14108c1a49aeSSteven Rostedt (Red Hat) static int 14118c1a49aeSSteven Rostedt (Red Hat) blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) 1412f3948f88SLi Zefan { 1413f3948f88SLi Zefan /* don't output context-info for blk_classic output */ 1414f3948f88SLi Zefan if (bit == TRACE_BLK_OPT_CLASSIC) { 1415f3948f88SLi Zefan if (set) 1416983f938aSSteven Rostedt (Red Hat) tr->trace_flags &= ~TRACE_ITER_CONTEXT_INFO; 1417f3948f88SLi Zefan else 1418983f938aSSteven Rostedt (Red Hat) tr->trace_flags |= TRACE_ITER_CONTEXT_INFO; 1419f3948f88SLi Zefan } 1420f3948f88SLi Zefan return 0; 1421f3948f88SLi Zefan } 1422f3948f88SLi Zefan 14232db270a8SFrederic Weisbecker static struct tracer blk_tracer __read_mostly = { 14242db270a8SFrederic Weisbecker .name = "blk", 14252db270a8SFrederic Weisbecker .init = blk_tracer_init, 14262db270a8SFrederic Weisbecker .reset = blk_tracer_reset, 14272db270a8SFrederic Weisbecker .start = blk_tracer_start, 14282db270a8SFrederic Weisbecker .stop = blk_tracer_stop, 14292db270a8SFrederic Weisbecker .print_header = blk_tracer_print_header, 14302db270a8SFrederic Weisbecker .print_line = blk_tracer_print_line, 14312db270a8SFrederic Weisbecker .flags = &blk_tracer_flags, 1432f3948f88SLi Zefan .set_flag = blk_tracer_set_flag, 14332db270a8SFrederic Weisbecker }; 14342db270a8SFrederic Weisbecker 1435a9a57763SSteven Rostedt static struct trace_event_functions trace_blk_event_funcs = { 14362db270a8SFrederic Weisbecker .trace = blk_trace_event_print, 14372db270a8SFrederic Weisbecker .binary = blk_trace_event_print_binary, 14382db270a8SFrederic Weisbecker }; 14392db270a8SFrederic Weisbecker 1440a9a57763SSteven Rostedt static struct trace_event trace_blk_event = { 1441a9a57763SSteven Rostedt .type = TRACE_BLK, 1442a9a57763SSteven Rostedt .funcs = &trace_blk_event_funcs, 1443a9a57763SSteven Rostedt }; 1444a9a57763SSteven Rostedt 14452db270a8SFrederic Weisbecker static int __init init_blk_tracer(void) 14462db270a8SFrederic Weisbecker { 14479023c930SSteven Rostedt (Red Hat) if (!register_trace_event(&trace_blk_event)) { 1448a395d6a7SJoe Perches pr_warn("Warning: could not register block events\n"); 14492db270a8SFrederic Weisbecker return 1; 14502db270a8SFrederic Weisbecker } 14512db270a8SFrederic Weisbecker 14522db270a8SFrederic Weisbecker if (register_tracer(&blk_tracer) != 0) { 1453a395d6a7SJoe Perches pr_warn("Warning: could not register the block tracer\n"); 14549023c930SSteven Rostedt (Red Hat) unregister_trace_event(&trace_blk_event); 14552db270a8SFrederic Weisbecker return 1; 14562db270a8SFrederic Weisbecker } 14572db270a8SFrederic Weisbecker 14582db270a8SFrederic Weisbecker return 0; 14592db270a8SFrederic Weisbecker } 14602db270a8SFrederic Weisbecker 14612db270a8SFrederic Weisbecker device_initcall(init_blk_tracer); 14622db270a8SFrederic Weisbecker 14632db270a8SFrederic Weisbecker static int blk_trace_remove_queue(struct request_queue *q) 14642db270a8SFrederic Weisbecker { 14652db270a8SFrederic Weisbecker struct blk_trace *bt; 14662db270a8SFrederic Weisbecker 14672db270a8SFrederic Weisbecker bt = xchg(&q->blk_trace, NULL); 14682db270a8SFrederic Weisbecker if (bt == NULL) 14692db270a8SFrederic Weisbecker return -EINVAL; 14702db270a8SFrederic Weisbecker 147117ba97e3SLi Zefan if (atomic_dec_and_test(&blk_probes_ref)) 147217ba97e3SLi Zefan blk_unregister_tracepoints(); 147317ba97e3SLi Zefan 1474ad5dd549SLi Zefan blk_trace_free(bt); 14752db270a8SFrederic Weisbecker return 0; 14762db270a8SFrederic Weisbecker } 14772db270a8SFrederic Weisbecker 14782db270a8SFrederic Weisbecker /* 14792db270a8SFrederic Weisbecker * Setup everything required to start tracing 14802db270a8SFrederic Weisbecker */ 14819908c309SLi Zefan static int blk_trace_setup_queue(struct request_queue *q, 14829908c309SLi Zefan struct block_device *bdev) 14832db270a8SFrederic Weisbecker { 1484cdea01b2SDavidlohr Bueso struct blk_trace *bt = NULL; 148518cea459SLi Zefan int ret = -ENOMEM; 14862db270a8SFrederic Weisbecker 14872db270a8SFrederic Weisbecker bt = kzalloc(sizeof(*bt), GFP_KERNEL); 14882db270a8SFrederic Weisbecker if (!bt) 148915152e44SLi Zefan return -ENOMEM; 14902db270a8SFrederic Weisbecker 149118cea459SLi Zefan bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 149218cea459SLi Zefan if (!bt->msg_data) 149318cea459SLi Zefan goto free_bt; 149418cea459SLi Zefan 14959908c309SLi Zefan bt->dev = bdev->bd_dev; 14962db270a8SFrederic Weisbecker bt->act_mask = (u16)-1; 14979908c309SLi Zefan 14989908c309SLi Zefan blk_trace_setup_lba(bt, bdev); 14992db270a8SFrederic Weisbecker 150018cea459SLi Zefan ret = -EBUSY; 1501cdea01b2SDavidlohr Bueso if (cmpxchg(&q->blk_trace, NULL, bt)) 150218cea459SLi Zefan goto free_bt; 150315152e44SLi Zefan 150417ba97e3SLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 150517ba97e3SLi Zefan blk_register_tracepoints(); 15062db270a8SFrederic Weisbecker return 0; 150718cea459SLi Zefan 150818cea459SLi Zefan free_bt: 150918cea459SLi Zefan blk_trace_free(bt); 151018cea459SLi Zefan return ret; 15112db270a8SFrederic Weisbecker } 15122db270a8SFrederic Weisbecker 15132db270a8SFrederic Weisbecker /* 15142db270a8SFrederic Weisbecker * sysfs interface to enable and configure tracing 15152db270a8SFrederic Weisbecker */ 15162db270a8SFrederic Weisbecker 15172db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_show(struct device *dev, 15182db270a8SFrederic Weisbecker struct device_attribute *attr, 15192db270a8SFrederic Weisbecker char *buf); 15202db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_store(struct device *dev, 15212db270a8SFrederic Weisbecker struct device_attribute *attr, 15222db270a8SFrederic Weisbecker const char *buf, size_t count); 15232db270a8SFrederic Weisbecker #define BLK_TRACE_DEVICE_ATTR(_name) \ 15242db270a8SFrederic Weisbecker DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ 15252db270a8SFrederic Weisbecker sysfs_blk_trace_attr_show, \ 15262db270a8SFrederic Weisbecker sysfs_blk_trace_attr_store) 15272db270a8SFrederic Weisbecker 1528cd649b8bSLi Zefan static BLK_TRACE_DEVICE_ATTR(enable); 15292db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(act_mask); 15302db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(pid); 15312db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(start_lba); 15322db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(end_lba); 15332db270a8SFrederic Weisbecker 15342db270a8SFrederic Weisbecker static struct attribute *blk_trace_attrs[] = { 15352db270a8SFrederic Weisbecker &dev_attr_enable.attr, 15362db270a8SFrederic Weisbecker &dev_attr_act_mask.attr, 15372db270a8SFrederic Weisbecker &dev_attr_pid.attr, 15382db270a8SFrederic Weisbecker &dev_attr_start_lba.attr, 15392db270a8SFrederic Weisbecker &dev_attr_end_lba.attr, 15402db270a8SFrederic Weisbecker NULL 15412db270a8SFrederic Weisbecker }; 15422db270a8SFrederic Weisbecker 15432db270a8SFrederic Weisbecker struct attribute_group blk_trace_attr_group = { 15442db270a8SFrederic Weisbecker .name = "trace", 15452db270a8SFrederic Weisbecker .attrs = blk_trace_attrs, 15462db270a8SFrederic Weisbecker }; 15472db270a8SFrederic Weisbecker 154809341997SLi Zefan static const struct { 154909341997SLi Zefan int mask; 155009341997SLi Zefan const char *str; 155109341997SLi Zefan } mask_maps[] = { 155209341997SLi Zefan { BLK_TC_READ, "read" }, 155309341997SLi Zefan { BLK_TC_WRITE, "write" }, 1554c09c47caSNamhyung Kim { BLK_TC_FLUSH, "flush" }, 155509341997SLi Zefan { BLK_TC_SYNC, "sync" }, 155609341997SLi Zefan { BLK_TC_QUEUE, "queue" }, 155709341997SLi Zefan { BLK_TC_REQUEUE, "requeue" }, 155809341997SLi Zefan { BLK_TC_ISSUE, "issue" }, 155909341997SLi Zefan { BLK_TC_COMPLETE, "complete" }, 156009341997SLi Zefan { BLK_TC_FS, "fs" }, 156109341997SLi Zefan { BLK_TC_PC, "pc" }, 15628d1547e0SShaohua Li { BLK_TC_NOTIFY, "notify" }, 156309341997SLi Zefan { BLK_TC_AHEAD, "ahead" }, 156409341997SLi Zefan { BLK_TC_META, "meta" }, 156509341997SLi Zefan { BLK_TC_DISCARD, "discard" }, 156609341997SLi Zefan { BLK_TC_DRV_DATA, "drv_data" }, 1567c09c47caSNamhyung Kim { BLK_TC_FUA, "fua" }, 156809341997SLi Zefan }; 156909341997SLi Zefan 157009341997SLi Zefan static int blk_trace_str2mask(const char *str) 15712db270a8SFrederic Weisbecker { 157209341997SLi Zefan int i; 15732db270a8SFrederic Weisbecker int mask = 0; 15749eb85125SLi Zefan char *buf, *s, *token; 15752db270a8SFrederic Weisbecker 15769eb85125SLi Zefan buf = kstrdup(str, GFP_KERNEL); 15779eb85125SLi Zefan if (buf == NULL) 15782db270a8SFrederic Weisbecker return -ENOMEM; 15799eb85125SLi Zefan s = strstrip(buf); 15802db270a8SFrederic Weisbecker 15812db270a8SFrederic Weisbecker while (1) { 158209341997SLi Zefan token = strsep(&s, ","); 158309341997SLi Zefan if (token == NULL) 15842db270a8SFrederic Weisbecker break; 15852db270a8SFrederic Weisbecker 158609341997SLi Zefan if (*token == '\0') 158709341997SLi Zefan continue; 158809341997SLi Zefan 158909341997SLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 159009341997SLi Zefan if (strcasecmp(token, mask_maps[i].str) == 0) { 159109341997SLi Zefan mask |= mask_maps[i].mask; 159209341997SLi Zefan break; 15932db270a8SFrederic Weisbecker } 159409341997SLi Zefan } 159509341997SLi Zefan if (i == ARRAY_SIZE(mask_maps)) { 159609341997SLi Zefan mask = -EINVAL; 159709341997SLi Zefan break; 159809341997SLi Zefan } 159909341997SLi Zefan } 16009eb85125SLi Zefan kfree(buf); 16012db270a8SFrederic Weisbecker 16022db270a8SFrederic Weisbecker return mask; 16032db270a8SFrederic Weisbecker } 16042db270a8SFrederic Weisbecker 160509341997SLi Zefan static ssize_t blk_trace_mask2str(char *buf, int mask) 160609341997SLi Zefan { 160709341997SLi Zefan int i; 160809341997SLi Zefan char *p = buf; 160909341997SLi Zefan 161009341997SLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 161109341997SLi Zefan if (mask & mask_maps[i].mask) { 161209341997SLi Zefan p += sprintf(p, "%s%s", 161309341997SLi Zefan (p == buf) ? "" : ",", mask_maps[i].str); 161409341997SLi Zefan } 161509341997SLi Zefan } 161609341997SLi Zefan *p++ = '\n'; 161709341997SLi Zefan 161809341997SLi Zefan return p - buf; 161909341997SLi Zefan } 162009341997SLi Zefan 1621b125130bSLi Zefan static struct request_queue *blk_trace_get_queue(struct block_device *bdev) 1622b125130bSLi Zefan { 1623b125130bSLi Zefan if (bdev->bd_disk == NULL) 1624b125130bSLi Zefan return NULL; 1625b125130bSLi Zefan 1626b125130bSLi Zefan return bdev_get_queue(bdev); 1627b125130bSLi Zefan } 1628b125130bSLi Zefan 16292db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_show(struct device *dev, 16302db270a8SFrederic Weisbecker struct device_attribute *attr, 16312db270a8SFrederic Weisbecker char *buf) 16322db270a8SFrederic Weisbecker { 16332db270a8SFrederic Weisbecker struct hd_struct *p = dev_to_part(dev); 16342db270a8SFrederic Weisbecker struct request_queue *q; 16352db270a8SFrederic Weisbecker struct block_device *bdev; 16362db270a8SFrederic Weisbecker ssize_t ret = -ENXIO; 16372db270a8SFrederic Weisbecker 16382db270a8SFrederic Weisbecker bdev = bdget(part_devt(p)); 16392db270a8SFrederic Weisbecker if (bdev == NULL) 164001b284f9SArnd Bergmann goto out; 16412db270a8SFrederic Weisbecker 1642b125130bSLi Zefan q = blk_trace_get_queue(bdev); 16432db270a8SFrederic Weisbecker if (q == NULL) 16442db270a8SFrederic Weisbecker goto out_bdput; 1645b125130bSLi Zefan 16462db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 1647cd649b8bSLi Zefan 1648cd649b8bSLi Zefan if (attr == &dev_attr_enable) { 1649cd649b8bSLi Zefan ret = sprintf(buf, "%u\n", !!q->blk_trace); 1650cd649b8bSLi Zefan goto out_unlock_bdev; 1651cd649b8bSLi Zefan } 1652cd649b8bSLi Zefan 16532db270a8SFrederic Weisbecker if (q->blk_trace == NULL) 16542db270a8SFrederic Weisbecker ret = sprintf(buf, "disabled\n"); 16552db270a8SFrederic Weisbecker else if (attr == &dev_attr_act_mask) 165609341997SLi Zefan ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); 16572db270a8SFrederic Weisbecker else if (attr == &dev_attr_pid) 16582db270a8SFrederic Weisbecker ret = sprintf(buf, "%u\n", q->blk_trace->pid); 16592db270a8SFrederic Weisbecker else if (attr == &dev_attr_start_lba) 16602db270a8SFrederic Weisbecker ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); 16612db270a8SFrederic Weisbecker else if (attr == &dev_attr_end_lba) 16622db270a8SFrederic Weisbecker ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); 1663cd649b8bSLi Zefan 1664cd649b8bSLi Zefan out_unlock_bdev: 16652db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 16662db270a8SFrederic Weisbecker out_bdput: 16672db270a8SFrederic Weisbecker bdput(bdev); 166801b284f9SArnd Bergmann out: 16692db270a8SFrederic Weisbecker return ret; 16702db270a8SFrederic Weisbecker } 16712db270a8SFrederic Weisbecker 16722db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_store(struct device *dev, 16732db270a8SFrederic Weisbecker struct device_attribute *attr, 16742db270a8SFrederic Weisbecker const char *buf, size_t count) 16752db270a8SFrederic Weisbecker { 16762db270a8SFrederic Weisbecker struct block_device *bdev; 16772db270a8SFrederic Weisbecker struct request_queue *q; 16782db270a8SFrederic Weisbecker struct hd_struct *p; 16792db270a8SFrederic Weisbecker u64 value; 168009341997SLi Zefan ssize_t ret = -EINVAL; 16812db270a8SFrederic Weisbecker 16822db270a8SFrederic Weisbecker if (count == 0) 16832db270a8SFrederic Weisbecker goto out; 16842db270a8SFrederic Weisbecker 16852db270a8SFrederic Weisbecker if (attr == &dev_attr_act_mask) { 16862db270a8SFrederic Weisbecker if (sscanf(buf, "%llx", &value) != 1) { 16872db270a8SFrederic Weisbecker /* Assume it is a list of trace category names */ 168809341997SLi Zefan ret = blk_trace_str2mask(buf); 168909341997SLi Zefan if (ret < 0) 16902db270a8SFrederic Weisbecker goto out; 169109341997SLi Zefan value = ret; 16922db270a8SFrederic Weisbecker } 16932db270a8SFrederic Weisbecker } else if (sscanf(buf, "%llu", &value) != 1) 16942db270a8SFrederic Weisbecker goto out; 16952db270a8SFrederic Weisbecker 169609341997SLi Zefan ret = -ENXIO; 169709341997SLi Zefan 16982db270a8SFrederic Weisbecker p = dev_to_part(dev); 16992db270a8SFrederic Weisbecker bdev = bdget(part_devt(p)); 17002db270a8SFrederic Weisbecker if (bdev == NULL) 170101b284f9SArnd Bergmann goto out; 17022db270a8SFrederic Weisbecker 1703b125130bSLi Zefan q = blk_trace_get_queue(bdev); 17042db270a8SFrederic Weisbecker if (q == NULL) 17052db270a8SFrederic Weisbecker goto out_bdput; 17062db270a8SFrederic Weisbecker 17072db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 1708cd649b8bSLi Zefan 1709cd649b8bSLi Zefan if (attr == &dev_attr_enable) { 1710cd649b8bSLi Zefan if (value) 17119908c309SLi Zefan ret = blk_trace_setup_queue(q, bdev); 1712cd649b8bSLi Zefan else 1713cd649b8bSLi Zefan ret = blk_trace_remove_queue(q); 1714cd649b8bSLi Zefan goto out_unlock_bdev; 1715cd649b8bSLi Zefan } 1716cd649b8bSLi Zefan 17172db270a8SFrederic Weisbecker ret = 0; 17182db270a8SFrederic Weisbecker if (q->blk_trace == NULL) 17199908c309SLi Zefan ret = blk_trace_setup_queue(q, bdev); 17202db270a8SFrederic Weisbecker 17212db270a8SFrederic Weisbecker if (ret == 0) { 17222db270a8SFrederic Weisbecker if (attr == &dev_attr_act_mask) 17232db270a8SFrederic Weisbecker q->blk_trace->act_mask = value; 17242db270a8SFrederic Weisbecker else if (attr == &dev_attr_pid) 17252db270a8SFrederic Weisbecker q->blk_trace->pid = value; 17262db270a8SFrederic Weisbecker else if (attr == &dev_attr_start_lba) 17272db270a8SFrederic Weisbecker q->blk_trace->start_lba = value; 17282db270a8SFrederic Weisbecker else if (attr == &dev_attr_end_lba) 17292db270a8SFrederic Weisbecker q->blk_trace->end_lba = value; 17302db270a8SFrederic Weisbecker } 1731cd649b8bSLi Zefan 1732cd649b8bSLi Zefan out_unlock_bdev: 17332db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 17342db270a8SFrederic Weisbecker out_bdput: 17352db270a8SFrederic Weisbecker bdput(bdev); 17362db270a8SFrederic Weisbecker out: 1737cd649b8bSLi Zefan return ret ? ret : count; 17382db270a8SFrederic Weisbecker } 1739cd649b8bSLi Zefan 17401d54ad6dSLi Zefan int blk_trace_init_sysfs(struct device *dev) 17411d54ad6dSLi Zefan { 17421d54ad6dSLi Zefan return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); 17431d54ad6dSLi Zefan } 17441d54ad6dSLi Zefan 174548c0d4d4SZdenek Kabelac void blk_trace_remove_sysfs(struct device *dev) 174648c0d4d4SZdenek Kabelac { 174748c0d4d4SZdenek Kabelac sysfs_remove_group(&dev->kobj, &blk_trace_attr_group); 174848c0d4d4SZdenek Kabelac } 174948c0d4d4SZdenek Kabelac 175055782138SLi Zefan #endif /* CONFIG_BLK_DEV_IO_TRACE */ 175155782138SLi Zefan 175255782138SLi Zefan #ifdef CONFIG_EVENT_TRACING 175355782138SLi Zefan 175455782138SLi Zefan void blk_dump_cmd(char *buf, struct request *rq) 175555782138SLi Zefan { 175655782138SLi Zefan int i, end; 175755782138SLi Zefan int len = rq->cmd_len; 175855782138SLi Zefan unsigned char *cmd = rq->cmd; 175955782138SLi Zefan 176033659ebbSChristoph Hellwig if (rq->cmd_type != REQ_TYPE_BLOCK_PC) { 176155782138SLi Zefan buf[0] = '\0'; 176255782138SLi Zefan return; 176355782138SLi Zefan } 176455782138SLi Zefan 176555782138SLi Zefan for (end = len - 1; end >= 0; end--) 176655782138SLi Zefan if (cmd[end]) 176755782138SLi Zefan break; 176855782138SLi Zefan end++; 176955782138SLi Zefan 177055782138SLi Zefan for (i = 0; i < len; i++) { 177155782138SLi Zefan buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]); 177255782138SLi Zefan if (i == end && end != len - 1) { 177355782138SLi Zefan sprintf(buf, " .."); 177455782138SLi Zefan break; 177555782138SLi Zefan } 177655782138SLi Zefan } 177755782138SLi Zefan } 177855782138SLi Zefan 17791b9a9ab7SMike Christie void blk_fill_rwbs(char *rwbs, int op, u32 rw, int bytes) 178055782138SLi Zefan { 178155782138SLi Zefan int i = 0; 178255782138SLi Zefan 178328a8f0d3SMike Christie if (rw & REQ_PREFLUSH) 1784c09c47caSNamhyung Kim rwbs[i++] = 'F'; 1785c09c47caSNamhyung Kim 17861b9a9ab7SMike Christie switch (op) { 17871b9a9ab7SMike Christie case REQ_OP_WRITE: 17881b9a9ab7SMike Christie case REQ_OP_WRITE_SAME: 178955782138SLi Zefan rwbs[i++] = 'W'; 17901b9a9ab7SMike Christie break; 17911b9a9ab7SMike Christie case REQ_OP_DISCARD: 179255782138SLi Zefan rwbs[i++] = 'D'; 17931b9a9ab7SMike Christie break; 1794288dab8aSChristoph Hellwig case REQ_OP_SECURE_ERASE: 1795288dab8aSChristoph Hellwig rwbs[i++] = 'D'; 1796288dab8aSChristoph Hellwig rwbs[i++] = 'E'; 1797288dab8aSChristoph Hellwig break; 17983a5e02ceSMike Christie case REQ_OP_FLUSH: 17993a5e02ceSMike Christie rwbs[i++] = 'F'; 18003a5e02ceSMike Christie break; 18011b9a9ab7SMike Christie case REQ_OP_READ: 180255782138SLi Zefan rwbs[i++] = 'R'; 18031b9a9ab7SMike Christie break; 18041b9a9ab7SMike Christie default: 180555782138SLi Zefan rwbs[i++] = 'N'; 18061b9a9ab7SMike Christie } 180755782138SLi Zefan 1808c09c47caSNamhyung Kim if (rw & REQ_FUA) 1809c09c47caSNamhyung Kim rwbs[i++] = 'F'; 18107b6d91daSChristoph Hellwig if (rw & REQ_RAHEAD) 181155782138SLi Zefan rwbs[i++] = 'A'; 18127b6d91daSChristoph Hellwig if (rw & REQ_SYNC) 181355782138SLi Zefan rwbs[i++] = 'S'; 18147b6d91daSChristoph Hellwig if (rw & REQ_META) 181555782138SLi Zefan rwbs[i++] = 'M'; 181655782138SLi Zefan 181755782138SLi Zefan rwbs[i] = '\0'; 181855782138SLi Zefan } 18199ca8f8e5SKent Overstreet EXPORT_SYMBOL_GPL(blk_fill_rwbs); 182055782138SLi Zefan 182155782138SLi Zefan #endif /* CONFIG_EVENT_TRACING */ 182255782138SLi Zefan 1823