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> 26405f5571SAlexey Dobriyan #include <linux/smp_lock.h> 272db270a8SFrederic Weisbecker #include <linux/time.h> 282db270a8SFrederic Weisbecker #include <linux/uaccess.h> 2955782138SLi Zefan 3055782138SLi Zefan #include <trace/events/block.h> 3155782138SLi Zefan 322db270a8SFrederic Weisbecker #include "trace_output.h" 332db270a8SFrederic Weisbecker 3455782138SLi Zefan #ifdef CONFIG_BLK_DEV_IO_TRACE 3555782138SLi Zefan 362db270a8SFrederic Weisbecker static unsigned int blktrace_seq __read_mostly = 1; 372db270a8SFrederic Weisbecker 382db270a8SFrederic Weisbecker static struct trace_array *blk_tr; 395006ea73SLi Zefan static bool blk_tracer_enabled __read_mostly; 402db270a8SFrederic Weisbecker 412db270a8SFrederic Weisbecker /* Select an alternative, minimalistic output than the original one */ 422db270a8SFrederic Weisbecker #define TRACE_BLK_OPT_CLASSIC 0x1 432db270a8SFrederic Weisbecker 442db270a8SFrederic Weisbecker static struct tracer_opt blk_tracer_opts[] = { 452db270a8SFrederic Weisbecker /* Default disable the minimalistic output */ 462db270a8SFrederic Weisbecker { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) }, 472db270a8SFrederic Weisbecker { } 482db270a8SFrederic Weisbecker }; 492db270a8SFrederic Weisbecker 502db270a8SFrederic Weisbecker static struct tracer_flags blk_tracer_flags = { 512db270a8SFrederic Weisbecker .val = 0, 522db270a8SFrederic Weisbecker .opts = blk_tracer_opts, 532db270a8SFrederic Weisbecker }; 542db270a8SFrederic Weisbecker 552db270a8SFrederic Weisbecker /* Global reference count of probes */ 562db270a8SFrederic Weisbecker static atomic_t blk_probes_ref = ATOMIC_INIT(0); 572db270a8SFrederic Weisbecker 583c289ba7SLi Zefan static void blk_register_tracepoints(void); 592db270a8SFrederic Weisbecker static void blk_unregister_tracepoints(void); 602db270a8SFrederic Weisbecker 612db270a8SFrederic Weisbecker /* 622db270a8SFrederic Weisbecker * Send out a notify message. 632db270a8SFrederic Weisbecker */ 642db270a8SFrederic Weisbecker static void trace_note(struct blk_trace *bt, pid_t pid, int action, 652db270a8SFrederic Weisbecker const void *data, size_t len) 662db270a8SFrederic Weisbecker { 672db270a8SFrederic Weisbecker struct blk_io_trace *t; 6818cea459SLi Zefan struct ring_buffer_event *event = NULL; 69e77405adSSteven Rostedt struct ring_buffer *buffer = NULL; 7018cea459SLi Zefan int pc = 0; 7118cea459SLi Zefan int cpu = smp_processor_id(); 7218cea459SLi Zefan bool blk_tracer = blk_tracer_enabled; 7318cea459SLi Zefan 7418cea459SLi Zefan if (blk_tracer) { 75e77405adSSteven Rostedt buffer = blk_tr->buffer; 7618cea459SLi Zefan pc = preempt_count(); 77e77405adSSteven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BLK, 7818cea459SLi Zefan sizeof(*t) + len, 7918cea459SLi Zefan 0, pc); 8018cea459SLi Zefan if (!event) 8118cea459SLi Zefan return; 8218cea459SLi Zefan t = ring_buffer_event_data(event); 8318cea459SLi Zefan goto record_it; 8418cea459SLi Zefan } 852db270a8SFrederic Weisbecker 862db270a8SFrederic Weisbecker if (!bt->rchan) 872db270a8SFrederic Weisbecker return; 882db270a8SFrederic Weisbecker 892db270a8SFrederic Weisbecker t = relay_reserve(bt->rchan, sizeof(*t) + len); 902db270a8SFrederic Weisbecker if (t) { 912db270a8SFrederic Weisbecker t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 922db270a8SFrederic Weisbecker t->time = ktime_to_ns(ktime_get()); 9318cea459SLi Zefan record_it: 942db270a8SFrederic Weisbecker t->device = bt->dev; 952db270a8SFrederic Weisbecker t->action = action; 962db270a8SFrederic Weisbecker t->pid = pid; 972db270a8SFrederic Weisbecker t->cpu = cpu; 982db270a8SFrederic Weisbecker t->pdu_len = len; 992db270a8SFrederic Weisbecker memcpy((void *) t + sizeof(*t), data, len); 10018cea459SLi Zefan 10118cea459SLi Zefan if (blk_tracer) 102e77405adSSteven Rostedt trace_buffer_unlock_commit(buffer, event, 0, pc); 1032db270a8SFrederic Weisbecker } 1042db270a8SFrederic Weisbecker } 1052db270a8SFrederic Weisbecker 1062db270a8SFrederic Weisbecker /* 1072db270a8SFrederic Weisbecker * Send out a notify for this process, if we haven't done so since a trace 1082db270a8SFrederic Weisbecker * started 1092db270a8SFrederic Weisbecker */ 1102db270a8SFrederic Weisbecker static void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk) 1112db270a8SFrederic Weisbecker { 1122db270a8SFrederic Weisbecker tsk->btrace_seq = blktrace_seq; 1132db270a8SFrederic Weisbecker trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm)); 1142db270a8SFrederic Weisbecker } 1152db270a8SFrederic Weisbecker 1162db270a8SFrederic Weisbecker static void trace_note_time(struct blk_trace *bt) 1172db270a8SFrederic Weisbecker { 1182db270a8SFrederic Weisbecker struct timespec now; 1192db270a8SFrederic Weisbecker unsigned long flags; 1202db270a8SFrederic Weisbecker u32 words[2]; 1212db270a8SFrederic Weisbecker 1222db270a8SFrederic Weisbecker getnstimeofday(&now); 1232db270a8SFrederic Weisbecker words[0] = now.tv_sec; 1242db270a8SFrederic Weisbecker words[1] = now.tv_nsec; 1252db270a8SFrederic Weisbecker 1262db270a8SFrederic Weisbecker local_irq_save(flags); 1272db270a8SFrederic Weisbecker trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words)); 1282db270a8SFrederic Weisbecker local_irq_restore(flags); 1292db270a8SFrederic Weisbecker } 1302db270a8SFrederic Weisbecker 1312db270a8SFrederic Weisbecker void __trace_note_message(struct blk_trace *bt, const char *fmt, ...) 1322db270a8SFrederic Weisbecker { 1332db270a8SFrederic Weisbecker int n; 1342db270a8SFrederic Weisbecker va_list args; 1352db270a8SFrederic Weisbecker unsigned long flags; 1362db270a8SFrederic Weisbecker char *buf; 1372db270a8SFrederic Weisbecker 13818cea459SLi Zefan if (unlikely(bt->trace_state != Blktrace_running && 13918cea459SLi Zefan !blk_tracer_enabled)) 1402db270a8SFrederic Weisbecker return; 1412db270a8SFrederic Weisbecker 1422db270a8SFrederic Weisbecker local_irq_save(flags); 1432db270a8SFrederic Weisbecker buf = per_cpu_ptr(bt->msg_data, smp_processor_id()); 1442db270a8SFrederic Weisbecker va_start(args, fmt); 1452db270a8SFrederic Weisbecker n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); 1462db270a8SFrederic Weisbecker va_end(args); 1472db270a8SFrederic Weisbecker 1482db270a8SFrederic Weisbecker trace_note(bt, 0, BLK_TN_MESSAGE, buf, n); 1492db270a8SFrederic Weisbecker local_irq_restore(flags); 1502db270a8SFrederic Weisbecker } 1512db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(__trace_note_message); 1522db270a8SFrederic Weisbecker 1532db270a8SFrederic Weisbecker static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, 1542db270a8SFrederic Weisbecker pid_t pid) 1552db270a8SFrederic Weisbecker { 1562db270a8SFrederic Weisbecker if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) 1572db270a8SFrederic Weisbecker return 1; 158d0deef5bSShawn Du if (sector && (sector < bt->start_lba || sector > bt->end_lba)) 1592db270a8SFrederic Weisbecker return 1; 1602db270a8SFrederic Weisbecker if (bt->pid && pid != bt->pid) 1612db270a8SFrederic Weisbecker return 1; 1622db270a8SFrederic Weisbecker 1632db270a8SFrederic Weisbecker return 0; 1642db270a8SFrederic Weisbecker } 1652db270a8SFrederic Weisbecker 1662db270a8SFrederic Weisbecker /* 1672db270a8SFrederic Weisbecker * Data direction bit lookup 1682db270a8SFrederic Weisbecker */ 169e4955c99SLi Zefan static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), 1702db270a8SFrederic Weisbecker BLK_TC_ACT(BLK_TC_WRITE) }; 1712db270a8SFrederic Weisbecker 1727b6d91daSChristoph Hellwig #define BLK_TC_HARDBARRIER BLK_TC_BARRIER 1737b6d91daSChristoph Hellwig #define BLK_TC_RAHEAD BLK_TC_AHEAD 1747b6d91daSChristoph Hellwig 1752db270a8SFrederic Weisbecker /* The ilog2() calls fall out because they're constant */ 1767b6d91daSChristoph Hellwig #define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \ 1777b6d91daSChristoph Hellwig (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name)) 1782db270a8SFrederic Weisbecker 1792db270a8SFrederic Weisbecker /* 1802db270a8SFrederic Weisbecker * The worker for the various blk_add_trace*() types. Fills out a 1812db270a8SFrederic Weisbecker * blk_io_trace structure and places it in a per-cpu subbuffer. 1822db270a8SFrederic Weisbecker */ 1832db270a8SFrederic Weisbecker static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, 1842db270a8SFrederic Weisbecker int rw, u32 what, int error, int pdu_len, void *pdu_data) 1852db270a8SFrederic Weisbecker { 1862db270a8SFrederic Weisbecker struct task_struct *tsk = current; 1872db270a8SFrederic Weisbecker struct ring_buffer_event *event = NULL; 188e77405adSSteven Rostedt struct ring_buffer *buffer = NULL; 1892db270a8SFrederic Weisbecker struct blk_io_trace *t; 1902db270a8SFrederic Weisbecker unsigned long flags = 0; 1912db270a8SFrederic Weisbecker unsigned long *sequence; 1922db270a8SFrederic Weisbecker pid_t pid; 1932db270a8SFrederic Weisbecker int cpu, pc = 0; 19418cea459SLi Zefan bool blk_tracer = blk_tracer_enabled; 1952db270a8SFrederic Weisbecker 19618cea459SLi Zefan if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) 1972db270a8SFrederic Weisbecker return; 1982db270a8SFrederic Weisbecker 1992db270a8SFrederic Weisbecker what |= ddir_act[rw & WRITE]; 2007b6d91daSChristoph Hellwig what |= MASK_TC_BIT(rw, HARDBARRIER); 2017b6d91daSChristoph Hellwig what |= MASK_TC_BIT(rw, SYNC); 2027b6d91daSChristoph Hellwig what |= MASK_TC_BIT(rw, RAHEAD); 2032db270a8SFrederic Weisbecker what |= MASK_TC_BIT(rw, META); 2042db270a8SFrederic Weisbecker what |= MASK_TC_BIT(rw, DISCARD); 2052db270a8SFrederic Weisbecker 2062db270a8SFrederic Weisbecker pid = tsk->pid; 207d0deef5bSShawn Du if (act_log_check(bt, what, sector, pid)) 2082db270a8SFrederic Weisbecker return; 2092db270a8SFrederic Weisbecker cpu = raw_smp_processor_id(); 2102db270a8SFrederic Weisbecker 21118cea459SLi Zefan if (blk_tracer) { 2122db270a8SFrederic Weisbecker tracing_record_cmdline(current); 2132db270a8SFrederic Weisbecker 214e77405adSSteven Rostedt buffer = blk_tr->buffer; 2152db270a8SFrederic Weisbecker pc = preempt_count(); 216e77405adSSteven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BLK, 2172db270a8SFrederic Weisbecker sizeof(*t) + pdu_len, 2182db270a8SFrederic Weisbecker 0, pc); 2192db270a8SFrederic Weisbecker if (!event) 2202db270a8SFrederic Weisbecker return; 2212db270a8SFrederic Weisbecker t = ring_buffer_event_data(event); 2222db270a8SFrederic Weisbecker goto record_it; 2232db270a8SFrederic Weisbecker } 2242db270a8SFrederic Weisbecker 2252db270a8SFrederic Weisbecker /* 2262db270a8SFrederic Weisbecker * A word about the locking here - we disable interrupts to reserve 2272db270a8SFrederic Weisbecker * some space in the relay per-cpu buffer, to prevent an irq 2282db270a8SFrederic Weisbecker * from coming in and stepping on our toes. 2292db270a8SFrederic Weisbecker */ 2302db270a8SFrederic Weisbecker local_irq_save(flags); 2312db270a8SFrederic Weisbecker 2322db270a8SFrederic Weisbecker if (unlikely(tsk->btrace_seq != blktrace_seq)) 2332db270a8SFrederic Weisbecker trace_note_tsk(bt, tsk); 2342db270a8SFrederic Weisbecker 2352db270a8SFrederic Weisbecker t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len); 2362db270a8SFrederic Weisbecker if (t) { 2372db270a8SFrederic Weisbecker sequence = per_cpu_ptr(bt->sequence, cpu); 2382db270a8SFrederic Weisbecker 2392db270a8SFrederic Weisbecker t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 2402db270a8SFrederic Weisbecker t->sequence = ++(*sequence); 2412db270a8SFrederic Weisbecker t->time = ktime_to_ns(ktime_get()); 2422db270a8SFrederic Weisbecker record_it: 2432db270a8SFrederic Weisbecker /* 2442db270a8SFrederic Weisbecker * These two are not needed in ftrace as they are in the 2452db270a8SFrederic Weisbecker * generic trace_entry, filled by tracing_generic_entry_update, 2462db270a8SFrederic Weisbecker * but for the trace_event->bin() synthesizer benefit we do it 2472db270a8SFrederic Weisbecker * here too. 2482db270a8SFrederic Weisbecker */ 2492db270a8SFrederic Weisbecker t->cpu = cpu; 2502db270a8SFrederic Weisbecker t->pid = pid; 2512db270a8SFrederic Weisbecker 2522db270a8SFrederic Weisbecker t->sector = sector; 2532db270a8SFrederic Weisbecker t->bytes = bytes; 2542db270a8SFrederic Weisbecker t->action = what; 2552db270a8SFrederic Weisbecker t->device = bt->dev; 2562db270a8SFrederic Weisbecker t->error = error; 2572db270a8SFrederic Weisbecker t->pdu_len = pdu_len; 2582db270a8SFrederic Weisbecker 2592db270a8SFrederic Weisbecker if (pdu_len) 2602db270a8SFrederic Weisbecker memcpy((void *) t + sizeof(*t), pdu_data, pdu_len); 2612db270a8SFrederic Weisbecker 26218cea459SLi Zefan if (blk_tracer) { 263e77405adSSteven Rostedt trace_buffer_unlock_commit(buffer, event, 0, pc); 2642db270a8SFrederic Weisbecker return; 2652db270a8SFrederic Weisbecker } 2662db270a8SFrederic Weisbecker } 2672db270a8SFrederic Weisbecker 2682db270a8SFrederic Weisbecker local_irq_restore(flags); 2692db270a8SFrederic Weisbecker } 2702db270a8SFrederic Weisbecker 2712db270a8SFrederic Weisbecker static struct dentry *blk_tree_root; 2722db270a8SFrederic Weisbecker static DEFINE_MUTEX(blk_tree_mutex); 2732db270a8SFrederic Weisbecker 274ad5dd549SLi Zefan static void blk_trace_free(struct blk_trace *bt) 2752db270a8SFrederic Weisbecker { 2762db270a8SFrederic Weisbecker debugfs_remove(bt->msg_file); 2772db270a8SFrederic Weisbecker debugfs_remove(bt->dropped_file); 2782db270a8SFrederic Weisbecker relay_close(bt->rchan); 27939cbb602SAlan D. Brunelle debugfs_remove(bt->dir); 2802db270a8SFrederic Weisbecker free_percpu(bt->sequence); 2812db270a8SFrederic Weisbecker free_percpu(bt->msg_data); 2822db270a8SFrederic Weisbecker kfree(bt); 283ad5dd549SLi Zefan } 284ad5dd549SLi Zefan 285ad5dd549SLi Zefan static void blk_trace_cleanup(struct blk_trace *bt) 286ad5dd549SLi Zefan { 287ad5dd549SLi Zefan blk_trace_free(bt); 2882db270a8SFrederic Weisbecker if (atomic_dec_and_test(&blk_probes_ref)) 2892db270a8SFrederic Weisbecker blk_unregister_tracepoints(); 2902db270a8SFrederic Weisbecker } 2912db270a8SFrederic Weisbecker 2922db270a8SFrederic Weisbecker int blk_trace_remove(struct request_queue *q) 2932db270a8SFrederic Weisbecker { 2942db270a8SFrederic Weisbecker struct blk_trace *bt; 2952db270a8SFrederic Weisbecker 2962db270a8SFrederic Weisbecker bt = xchg(&q->blk_trace, NULL); 2972db270a8SFrederic Weisbecker if (!bt) 2982db270a8SFrederic Weisbecker return -EINVAL; 2992db270a8SFrederic Weisbecker 30055547204SLi Zefan if (bt->trace_state != Blktrace_running) 3012db270a8SFrederic Weisbecker blk_trace_cleanup(bt); 3022db270a8SFrederic Weisbecker 3032db270a8SFrederic Weisbecker return 0; 3042db270a8SFrederic Weisbecker } 3052db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_remove); 3062db270a8SFrederic Weisbecker 3072db270a8SFrederic Weisbecker static int blk_dropped_open(struct inode *inode, struct file *filp) 3082db270a8SFrederic Weisbecker { 3092db270a8SFrederic Weisbecker filp->private_data = inode->i_private; 3102db270a8SFrederic Weisbecker 3112db270a8SFrederic Weisbecker return 0; 3122db270a8SFrederic Weisbecker } 3132db270a8SFrederic Weisbecker 3142db270a8SFrederic Weisbecker static ssize_t blk_dropped_read(struct file *filp, char __user *buffer, 3152db270a8SFrederic Weisbecker size_t count, loff_t *ppos) 3162db270a8SFrederic Weisbecker { 3172db270a8SFrederic Weisbecker struct blk_trace *bt = filp->private_data; 3182db270a8SFrederic Weisbecker char buf[16]; 3192db270a8SFrederic Weisbecker 3202db270a8SFrederic Weisbecker snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); 3212db270a8SFrederic Weisbecker 3222db270a8SFrederic Weisbecker return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 3232db270a8SFrederic Weisbecker } 3242db270a8SFrederic Weisbecker 3252db270a8SFrederic Weisbecker static const struct file_operations blk_dropped_fops = { 3262db270a8SFrederic Weisbecker .owner = THIS_MODULE, 3272db270a8SFrederic Weisbecker .open = blk_dropped_open, 3282db270a8SFrederic Weisbecker .read = blk_dropped_read, 3292db270a8SFrederic Weisbecker }; 3302db270a8SFrederic Weisbecker 3312db270a8SFrederic Weisbecker static int blk_msg_open(struct inode *inode, struct file *filp) 3322db270a8SFrederic Weisbecker { 3332db270a8SFrederic Weisbecker filp->private_data = inode->i_private; 3342db270a8SFrederic Weisbecker 3352db270a8SFrederic Weisbecker return 0; 3362db270a8SFrederic Weisbecker } 3372db270a8SFrederic Weisbecker 3382db270a8SFrederic Weisbecker static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, 3392db270a8SFrederic Weisbecker size_t count, loff_t *ppos) 3402db270a8SFrederic Weisbecker { 3412db270a8SFrederic Weisbecker char *msg; 3422db270a8SFrederic Weisbecker struct blk_trace *bt; 3432db270a8SFrederic Weisbecker 3447635b03aSLi Zefan if (count >= BLK_TN_MAX_MSG) 3452db270a8SFrederic Weisbecker return -EINVAL; 3462db270a8SFrederic Weisbecker 347a4b3ada8SCarl Henrik Lunde msg = kmalloc(count + 1, GFP_KERNEL); 3482db270a8SFrederic Weisbecker if (msg == NULL) 3492db270a8SFrederic Weisbecker return -ENOMEM; 3502db270a8SFrederic Weisbecker 3512db270a8SFrederic Weisbecker if (copy_from_user(msg, buffer, count)) { 3522db270a8SFrederic Weisbecker kfree(msg); 3532db270a8SFrederic Weisbecker return -EFAULT; 3542db270a8SFrederic Weisbecker } 3552db270a8SFrederic Weisbecker 356a4b3ada8SCarl Henrik Lunde msg[count] = '\0'; 3572db270a8SFrederic Weisbecker bt = filp->private_data; 3582db270a8SFrederic Weisbecker __trace_note_message(bt, "%s", msg); 3592db270a8SFrederic Weisbecker kfree(msg); 3602db270a8SFrederic Weisbecker 3612db270a8SFrederic Weisbecker return count; 3622db270a8SFrederic Weisbecker } 3632db270a8SFrederic Weisbecker 3642db270a8SFrederic Weisbecker static const struct file_operations blk_msg_fops = { 3652db270a8SFrederic Weisbecker .owner = THIS_MODULE, 3662db270a8SFrederic Weisbecker .open = blk_msg_open, 3672db270a8SFrederic Weisbecker .write = blk_msg_write, 3682db270a8SFrederic Weisbecker }; 3692db270a8SFrederic Weisbecker 3702db270a8SFrederic Weisbecker /* 3712db270a8SFrederic Weisbecker * Keep track of how many times we encountered a full subbuffer, to aid 3722db270a8SFrederic Weisbecker * the user space app in telling how many lost events there were. 3732db270a8SFrederic Weisbecker */ 3742db270a8SFrederic Weisbecker static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, 3752db270a8SFrederic Weisbecker void *prev_subbuf, size_t prev_padding) 3762db270a8SFrederic Weisbecker { 3772db270a8SFrederic Weisbecker struct blk_trace *bt; 3782db270a8SFrederic Weisbecker 3792db270a8SFrederic Weisbecker if (!relay_buf_full(buf)) 3802db270a8SFrederic Weisbecker return 1; 3812db270a8SFrederic Weisbecker 3822db270a8SFrederic Weisbecker bt = buf->chan->private_data; 3832db270a8SFrederic Weisbecker atomic_inc(&bt->dropped); 3842db270a8SFrederic Weisbecker return 0; 3852db270a8SFrederic Weisbecker } 3862db270a8SFrederic Weisbecker 3872db270a8SFrederic Weisbecker static int blk_remove_buf_file_callback(struct dentry *dentry) 3882db270a8SFrederic Weisbecker { 3892db270a8SFrederic Weisbecker debugfs_remove(dentry); 3902db270a8SFrederic Weisbecker 3912db270a8SFrederic Weisbecker return 0; 3922db270a8SFrederic Weisbecker } 3932db270a8SFrederic Weisbecker 3942db270a8SFrederic Weisbecker static struct dentry *blk_create_buf_file_callback(const char *filename, 3952db270a8SFrederic Weisbecker struct dentry *parent, 3962db270a8SFrederic Weisbecker int mode, 3972db270a8SFrederic Weisbecker struct rchan_buf *buf, 3982db270a8SFrederic Weisbecker int *is_global) 3992db270a8SFrederic Weisbecker { 4002db270a8SFrederic Weisbecker return debugfs_create_file(filename, mode, parent, buf, 4012db270a8SFrederic Weisbecker &relay_file_operations); 4022db270a8SFrederic Weisbecker } 4032db270a8SFrederic Weisbecker 4042db270a8SFrederic Weisbecker static struct rchan_callbacks blk_relay_callbacks = { 4052db270a8SFrederic Weisbecker .subbuf_start = blk_subbuf_start_callback, 4062db270a8SFrederic Weisbecker .create_buf_file = blk_create_buf_file_callback, 4072db270a8SFrederic Weisbecker .remove_buf_file = blk_remove_buf_file_callback, 4082db270a8SFrederic Weisbecker }; 4092db270a8SFrederic Weisbecker 4109908c309SLi Zefan static void blk_trace_setup_lba(struct blk_trace *bt, 4119908c309SLi Zefan struct block_device *bdev) 4129908c309SLi Zefan { 4139908c309SLi Zefan struct hd_struct *part = NULL; 4149908c309SLi Zefan 4159908c309SLi Zefan if (bdev) 4169908c309SLi Zefan part = bdev->bd_part; 4179908c309SLi Zefan 4189908c309SLi Zefan if (part) { 4199908c309SLi Zefan bt->start_lba = part->start_sect; 4209908c309SLi Zefan bt->end_lba = part->start_sect + part->nr_sects; 4219908c309SLi Zefan } else { 4229908c309SLi Zefan bt->start_lba = 0; 4239908c309SLi Zefan bt->end_lba = -1ULL; 4249908c309SLi Zefan } 4259908c309SLi Zefan } 4269908c309SLi Zefan 4272db270a8SFrederic Weisbecker /* 4282db270a8SFrederic Weisbecker * Setup everything required to start tracing 4292db270a8SFrederic Weisbecker */ 4302db270a8SFrederic Weisbecker int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 431d0deef5bSShawn Du struct block_device *bdev, 4322db270a8SFrederic Weisbecker struct blk_user_trace_setup *buts) 4332db270a8SFrederic Weisbecker { 4342db270a8SFrederic Weisbecker struct blk_trace *old_bt, *bt = NULL; 4352db270a8SFrederic Weisbecker struct dentry *dir = NULL; 4362db270a8SFrederic Weisbecker int ret, i; 4372db270a8SFrederic Weisbecker 4382db270a8SFrederic Weisbecker if (!buts->buf_size || !buts->buf_nr) 4392db270a8SFrederic Weisbecker return -EINVAL; 4402db270a8SFrederic Weisbecker 4412db270a8SFrederic Weisbecker strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); 4422db270a8SFrederic Weisbecker buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; 4432db270a8SFrederic Weisbecker 4442db270a8SFrederic Weisbecker /* 4452db270a8SFrederic Weisbecker * some device names have larger paths - convert the slashes 4462db270a8SFrederic Weisbecker * to underscores for this to work as expected 4472db270a8SFrederic Weisbecker */ 4482db270a8SFrederic Weisbecker for (i = 0; i < strlen(buts->name); i++) 4492db270a8SFrederic Weisbecker if (buts->name[i] == '/') 4502db270a8SFrederic Weisbecker buts->name[i] = '_'; 4512db270a8SFrederic Weisbecker 4522db270a8SFrederic Weisbecker bt = kzalloc(sizeof(*bt), GFP_KERNEL); 4532db270a8SFrederic Weisbecker if (!bt) 454ad5dd549SLi Zefan return -ENOMEM; 4552db270a8SFrederic Weisbecker 456ad5dd549SLi Zefan ret = -ENOMEM; 4572db270a8SFrederic Weisbecker bt->sequence = alloc_percpu(unsigned long); 4582db270a8SFrederic Weisbecker if (!bt->sequence) 4592db270a8SFrederic Weisbecker goto err; 4602db270a8SFrederic Weisbecker 461f0ef0398SIngo Molnar bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 4622db270a8SFrederic Weisbecker if (!bt->msg_data) 4632db270a8SFrederic Weisbecker goto err; 4642db270a8SFrederic Weisbecker 4652db270a8SFrederic Weisbecker ret = -ENOENT; 4662db270a8SFrederic Weisbecker 467b5230b56SLi Zefan mutex_lock(&blk_tree_mutex); 4682db270a8SFrederic Weisbecker if (!blk_tree_root) { 4692db270a8SFrederic Weisbecker blk_tree_root = debugfs_create_dir("block", NULL); 470b5230b56SLi Zefan if (!blk_tree_root) { 471b5230b56SLi Zefan mutex_unlock(&blk_tree_mutex); 4721a17662eSLi Zefan goto err; 4732db270a8SFrederic Weisbecker } 474b5230b56SLi Zefan } 475b5230b56SLi Zefan mutex_unlock(&blk_tree_mutex); 4762db270a8SFrederic Weisbecker 4772db270a8SFrederic Weisbecker dir = debugfs_create_dir(buts->name, blk_tree_root); 4782db270a8SFrederic Weisbecker 4792db270a8SFrederic Weisbecker if (!dir) 4802db270a8SFrederic Weisbecker goto err; 4812db270a8SFrederic Weisbecker 4822db270a8SFrederic Weisbecker bt->dir = dir; 4832db270a8SFrederic Weisbecker bt->dev = dev; 4842db270a8SFrederic Weisbecker atomic_set(&bt->dropped, 0); 4852db270a8SFrederic Weisbecker 4862db270a8SFrederic Weisbecker ret = -EIO; 4872db270a8SFrederic Weisbecker bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, 4882db270a8SFrederic Weisbecker &blk_dropped_fops); 4892db270a8SFrederic Weisbecker if (!bt->dropped_file) 4902db270a8SFrederic Weisbecker goto err; 4912db270a8SFrederic Weisbecker 4922db270a8SFrederic Weisbecker bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); 4932db270a8SFrederic Weisbecker if (!bt->msg_file) 4942db270a8SFrederic Weisbecker goto err; 4952db270a8SFrederic Weisbecker 4962db270a8SFrederic Weisbecker bt->rchan = relay_open("trace", dir, buts->buf_size, 4972db270a8SFrederic Weisbecker buts->buf_nr, &blk_relay_callbacks, bt); 4982db270a8SFrederic Weisbecker if (!bt->rchan) 4992db270a8SFrederic Weisbecker goto err; 5002db270a8SFrederic Weisbecker 5012db270a8SFrederic Weisbecker bt->act_mask = buts->act_mask; 5022db270a8SFrederic Weisbecker if (!bt->act_mask) 5032db270a8SFrederic Weisbecker bt->act_mask = (u16) -1; 5042db270a8SFrederic Weisbecker 5059908c309SLi Zefan blk_trace_setup_lba(bt, bdev); 5062db270a8SFrederic Weisbecker 507d0deef5bSShawn Du /* overwrite with user settings */ 508d0deef5bSShawn Du if (buts->start_lba) 509d0deef5bSShawn Du bt->start_lba = buts->start_lba; 510d0deef5bSShawn Du if (buts->end_lba) 511d0deef5bSShawn Du bt->end_lba = buts->end_lba; 512d0deef5bSShawn Du 5132db270a8SFrederic Weisbecker bt->pid = buts->pid; 5142db270a8SFrederic Weisbecker bt->trace_state = Blktrace_setup; 5152db270a8SFrederic Weisbecker 5162db270a8SFrederic Weisbecker ret = -EBUSY; 5172db270a8SFrederic Weisbecker old_bt = xchg(&q->blk_trace, bt); 5182db270a8SFrederic Weisbecker if (old_bt) { 5192db270a8SFrederic Weisbecker (void) xchg(&q->blk_trace, old_bt); 5202db270a8SFrederic Weisbecker goto err; 5212db270a8SFrederic Weisbecker } 5222db270a8SFrederic Weisbecker 52317ba97e3SLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 524cbe28296SLi Zefan blk_register_tracepoints(); 525cbe28296SLi Zefan 5262db270a8SFrederic Weisbecker return 0; 5272db270a8SFrederic Weisbecker err: 528ad5dd549SLi Zefan blk_trace_free(bt); 5292db270a8SFrederic Weisbecker return ret; 5302db270a8SFrederic Weisbecker } 5312db270a8SFrederic Weisbecker 5322db270a8SFrederic Weisbecker int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 533d0deef5bSShawn Du struct block_device *bdev, 5342db270a8SFrederic Weisbecker char __user *arg) 5352db270a8SFrederic Weisbecker { 5362db270a8SFrederic Weisbecker struct blk_user_trace_setup buts; 5372db270a8SFrederic Weisbecker int ret; 5382db270a8SFrederic Weisbecker 5392db270a8SFrederic Weisbecker ret = copy_from_user(&buts, arg, sizeof(buts)); 5402db270a8SFrederic Weisbecker if (ret) 5412db270a8SFrederic Weisbecker return -EFAULT; 5422db270a8SFrederic Weisbecker 543d0deef5bSShawn Du ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 5442db270a8SFrederic Weisbecker if (ret) 5452db270a8SFrederic Weisbecker return ret; 5462db270a8SFrederic Weisbecker 5479a8c28c8SDmitry Monakhov if (copy_to_user(arg, &buts, sizeof(buts))) { 5489a8c28c8SDmitry Monakhov blk_trace_remove(q); 5492db270a8SFrederic Weisbecker return -EFAULT; 5509a8c28c8SDmitry Monakhov } 5512db270a8SFrederic Weisbecker return 0; 5522db270a8SFrederic Weisbecker } 5532db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_setup); 5542db270a8SFrederic Weisbecker 55562c2a7d9SArnd Bergmann #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 55662c2a7d9SArnd Bergmann static int compat_blk_trace_setup(struct request_queue *q, char *name, 55762c2a7d9SArnd Bergmann dev_t dev, struct block_device *bdev, 55862c2a7d9SArnd Bergmann char __user *arg) 55962c2a7d9SArnd Bergmann { 56062c2a7d9SArnd Bergmann struct blk_user_trace_setup buts; 56162c2a7d9SArnd Bergmann struct compat_blk_user_trace_setup cbuts; 56262c2a7d9SArnd Bergmann int ret; 56362c2a7d9SArnd Bergmann 56462c2a7d9SArnd Bergmann if (copy_from_user(&cbuts, arg, sizeof(cbuts))) 56562c2a7d9SArnd Bergmann return -EFAULT; 56662c2a7d9SArnd Bergmann 56762c2a7d9SArnd Bergmann buts = (struct blk_user_trace_setup) { 56862c2a7d9SArnd Bergmann .act_mask = cbuts.act_mask, 56962c2a7d9SArnd Bergmann .buf_size = cbuts.buf_size, 57062c2a7d9SArnd Bergmann .buf_nr = cbuts.buf_nr, 57162c2a7d9SArnd Bergmann .start_lba = cbuts.start_lba, 57262c2a7d9SArnd Bergmann .end_lba = cbuts.end_lba, 57362c2a7d9SArnd Bergmann .pid = cbuts.pid, 57462c2a7d9SArnd Bergmann }; 57562c2a7d9SArnd Bergmann memcpy(&buts.name, &cbuts.name, 32); 57662c2a7d9SArnd Bergmann 57762c2a7d9SArnd Bergmann ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 57862c2a7d9SArnd Bergmann if (ret) 57962c2a7d9SArnd Bergmann return ret; 58062c2a7d9SArnd Bergmann 58162c2a7d9SArnd Bergmann if (copy_to_user(arg, &buts.name, 32)) { 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; 6092db270a8SFrederic Weisbecker 6102db270a8SFrederic Weisbecker trace_note_time(bt); 6112db270a8SFrederic Weisbecker ret = 0; 6122db270a8SFrederic Weisbecker } 6132db270a8SFrederic Weisbecker } else { 6142db270a8SFrederic Weisbecker if (bt->trace_state == Blktrace_running) { 6152db270a8SFrederic Weisbecker bt->trace_state = Blktrace_stopped; 6162db270a8SFrederic Weisbecker relay_flush(bt->rchan); 6172db270a8SFrederic Weisbecker ret = 0; 6182db270a8SFrederic Weisbecker } 6192db270a8SFrederic Weisbecker } 6202db270a8SFrederic Weisbecker 6212db270a8SFrederic Weisbecker return ret; 6222db270a8SFrederic Weisbecker } 6232db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_startstop); 6242db270a8SFrederic Weisbecker 6252db270a8SFrederic Weisbecker /** 6262db270a8SFrederic Weisbecker * blk_trace_ioctl: - handle the ioctls associated with tracing 6272db270a8SFrederic Weisbecker * @bdev: the block device 6282db270a8SFrederic Weisbecker * @cmd: the ioctl cmd 6292db270a8SFrederic Weisbecker * @arg: the argument data, if any 6302db270a8SFrederic Weisbecker * 6312db270a8SFrederic Weisbecker **/ 6322db270a8SFrederic Weisbecker int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) 6332db270a8SFrederic Weisbecker { 6342db270a8SFrederic Weisbecker struct request_queue *q; 6352db270a8SFrederic Weisbecker int ret, start = 0; 6362db270a8SFrederic Weisbecker char b[BDEVNAME_SIZE]; 6372db270a8SFrederic Weisbecker 6382db270a8SFrederic Weisbecker q = bdev_get_queue(bdev); 6392db270a8SFrederic Weisbecker if (!q) 6402db270a8SFrederic Weisbecker return -ENXIO; 6412db270a8SFrederic Weisbecker 64262c2a7d9SArnd Bergmann lock_kernel(); 6432db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 6442db270a8SFrederic Weisbecker 6452db270a8SFrederic Weisbecker switch (cmd) { 6462db270a8SFrederic Weisbecker case BLKTRACESETUP: 6472db270a8SFrederic Weisbecker bdevname(bdev, b); 648d0deef5bSShawn Du ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 6492db270a8SFrederic Weisbecker break; 65062c2a7d9SArnd Bergmann #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 65162c2a7d9SArnd Bergmann case BLKTRACESETUP32: 65262c2a7d9SArnd Bergmann bdevname(bdev, b); 65362c2a7d9SArnd Bergmann ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 65462c2a7d9SArnd Bergmann break; 65562c2a7d9SArnd Bergmann #endif 6562db270a8SFrederic Weisbecker case BLKTRACESTART: 6572db270a8SFrederic Weisbecker start = 1; 6582db270a8SFrederic Weisbecker case BLKTRACESTOP: 6592db270a8SFrederic Weisbecker ret = blk_trace_startstop(q, start); 6602db270a8SFrederic Weisbecker break; 6612db270a8SFrederic Weisbecker case BLKTRACETEARDOWN: 6622db270a8SFrederic Weisbecker ret = blk_trace_remove(q); 6632db270a8SFrederic Weisbecker break; 6642db270a8SFrederic Weisbecker default: 6652db270a8SFrederic Weisbecker ret = -ENOTTY; 6662db270a8SFrederic Weisbecker break; 6672db270a8SFrederic Weisbecker } 6682db270a8SFrederic Weisbecker 6692db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 67062c2a7d9SArnd Bergmann unlock_kernel(); 6712db270a8SFrederic Weisbecker return ret; 6722db270a8SFrederic Weisbecker } 6732db270a8SFrederic Weisbecker 6742db270a8SFrederic Weisbecker /** 6752db270a8SFrederic Weisbecker * blk_trace_shutdown: - stop and cleanup trace structures 6762db270a8SFrederic Weisbecker * @q: the request queue associated with the device 6772db270a8SFrederic Weisbecker * 6782db270a8SFrederic Weisbecker **/ 6792db270a8SFrederic Weisbecker void blk_trace_shutdown(struct request_queue *q) 6802db270a8SFrederic Weisbecker { 6812db270a8SFrederic Weisbecker if (q->blk_trace) { 6822db270a8SFrederic Weisbecker blk_trace_startstop(q, 0); 6832db270a8SFrederic Weisbecker blk_trace_remove(q); 6842db270a8SFrederic Weisbecker } 6852db270a8SFrederic Weisbecker } 6862db270a8SFrederic Weisbecker 6872db270a8SFrederic Weisbecker /* 6882db270a8SFrederic Weisbecker * blktrace probes 6892db270a8SFrederic Weisbecker */ 6902db270a8SFrederic Weisbecker 6912db270a8SFrederic Weisbecker /** 6922db270a8SFrederic Weisbecker * blk_add_trace_rq - Add a trace for a request oriented action 6932db270a8SFrederic Weisbecker * @q: queue the io is for 6942db270a8SFrederic Weisbecker * @rq: the source request 6952db270a8SFrederic Weisbecker * @what: the action 6962db270a8SFrederic Weisbecker * 6972db270a8SFrederic Weisbecker * Description: 6982db270a8SFrederic Weisbecker * Records an action against a request. Will log the bio offset + size. 6992db270a8SFrederic Weisbecker * 7002db270a8SFrederic Weisbecker **/ 7012db270a8SFrederic Weisbecker static void blk_add_trace_rq(struct request_queue *q, struct request *rq, 7022db270a8SFrederic Weisbecker u32 what) 7032db270a8SFrederic Weisbecker { 7042db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7052db270a8SFrederic Weisbecker int rw = rq->cmd_flags & 0x03; 7062db270a8SFrederic Weisbecker 7072db270a8SFrederic Weisbecker if (likely(!bt)) 7082db270a8SFrederic Weisbecker return; 7092db270a8SFrederic Weisbecker 71033659ebbSChristoph Hellwig if (rq->cmd_flags & REQ_DISCARD) 7117b6d91daSChristoph Hellwig rw |= REQ_DISCARD; 7122db270a8SFrederic Weisbecker 7138d57a98cSAdrian Hunter if (rq->cmd_flags & REQ_SECURE) 7148d57a98cSAdrian Hunter rw |= REQ_SECURE; 7158d57a98cSAdrian Hunter 71633659ebbSChristoph Hellwig if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 7172db270a8SFrederic Weisbecker what |= BLK_TC_ACT(BLK_TC_PC); 7182e46e8b2STejun Heo __blk_add_trace(bt, 0, blk_rq_bytes(rq), rw, 7192e46e8b2STejun Heo what, rq->errors, rq->cmd_len, rq->cmd); 7202db270a8SFrederic Weisbecker } else { 7212db270a8SFrederic Weisbecker what |= BLK_TC_ACT(BLK_TC_FS); 7222e46e8b2STejun Heo __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), rw, 7232e46e8b2STejun Heo what, rq->errors, 0, NULL); 7242db270a8SFrederic Weisbecker } 7252db270a8SFrederic Weisbecker } 7262db270a8SFrederic Weisbecker 72738516ab5SSteven Rostedt static void blk_add_trace_rq_abort(void *ignore, 72838516ab5SSteven Rostedt struct request_queue *q, struct request *rq) 7292db270a8SFrederic Weisbecker { 7302db270a8SFrederic Weisbecker blk_add_trace_rq(q, rq, BLK_TA_ABORT); 7312db270a8SFrederic Weisbecker } 7322db270a8SFrederic Weisbecker 73338516ab5SSteven Rostedt static void blk_add_trace_rq_insert(void *ignore, 73438516ab5SSteven Rostedt struct request_queue *q, struct request *rq) 7352db270a8SFrederic Weisbecker { 7362db270a8SFrederic Weisbecker blk_add_trace_rq(q, rq, BLK_TA_INSERT); 7372db270a8SFrederic Weisbecker } 7382db270a8SFrederic Weisbecker 73938516ab5SSteven Rostedt static void blk_add_trace_rq_issue(void *ignore, 74038516ab5SSteven Rostedt struct request_queue *q, struct request *rq) 7412db270a8SFrederic Weisbecker { 7422db270a8SFrederic Weisbecker blk_add_trace_rq(q, rq, BLK_TA_ISSUE); 7432db270a8SFrederic Weisbecker } 7442db270a8SFrederic Weisbecker 74538516ab5SSteven Rostedt static void blk_add_trace_rq_requeue(void *ignore, 74638516ab5SSteven Rostedt struct request_queue *q, 7472db270a8SFrederic Weisbecker struct request *rq) 7482db270a8SFrederic Weisbecker { 7492db270a8SFrederic Weisbecker blk_add_trace_rq(q, rq, BLK_TA_REQUEUE); 7502db270a8SFrederic Weisbecker } 7512db270a8SFrederic Weisbecker 75238516ab5SSteven Rostedt static void blk_add_trace_rq_complete(void *ignore, 75338516ab5SSteven Rostedt struct request_queue *q, 7542db270a8SFrederic Weisbecker struct request *rq) 7552db270a8SFrederic Weisbecker { 7562db270a8SFrederic Weisbecker blk_add_trace_rq(q, rq, BLK_TA_COMPLETE); 7572db270a8SFrederic Weisbecker } 7582db270a8SFrederic Weisbecker 7592db270a8SFrederic Weisbecker /** 7602db270a8SFrederic Weisbecker * blk_add_trace_bio - Add a trace for a bio oriented action 7612db270a8SFrederic Weisbecker * @q: queue the io is for 7622db270a8SFrederic Weisbecker * @bio: the source bio 7632db270a8SFrederic Weisbecker * @what: the action 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, 7702db270a8SFrederic Weisbecker u32 what) 7712db270a8SFrederic Weisbecker { 7722db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7732db270a8SFrederic Weisbecker 7742db270a8SFrederic Weisbecker if (likely(!bt)) 7752db270a8SFrederic Weisbecker return; 7762db270a8SFrederic Weisbecker 7772db270a8SFrederic Weisbecker __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, 7782db270a8SFrederic Weisbecker !bio_flagged(bio, BIO_UPTODATE), 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 { 7842db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_BOUNCE); 7852db270a8SFrederic Weisbecker } 7862db270a8SFrederic Weisbecker 78738516ab5SSteven Rostedt static void blk_add_trace_bio_complete(void *ignore, 78838516ab5SSteven Rostedt struct request_queue *q, struct bio *bio) 7892db270a8SFrederic Weisbecker { 7902db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_COMPLETE); 7912db270a8SFrederic Weisbecker } 7922db270a8SFrederic Weisbecker 79338516ab5SSteven Rostedt static void blk_add_trace_bio_backmerge(void *ignore, 79438516ab5SSteven Rostedt struct request_queue *q, 7952db270a8SFrederic Weisbecker struct bio *bio) 7962db270a8SFrederic Weisbecker { 7972db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE); 7982db270a8SFrederic Weisbecker } 7992db270a8SFrederic Weisbecker 80038516ab5SSteven Rostedt static void blk_add_trace_bio_frontmerge(void *ignore, 80138516ab5SSteven Rostedt struct request_queue *q, 8022db270a8SFrederic Weisbecker struct bio *bio) 8032db270a8SFrederic Weisbecker { 8042db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE); 8052db270a8SFrederic Weisbecker } 8062db270a8SFrederic Weisbecker 80738516ab5SSteven Rostedt static void blk_add_trace_bio_queue(void *ignore, 80838516ab5SSteven Rostedt struct request_queue *q, struct bio *bio) 8092db270a8SFrederic Weisbecker { 8102db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_QUEUE); 8112db270a8SFrederic Weisbecker } 8122db270a8SFrederic Weisbecker 81338516ab5SSteven Rostedt static void blk_add_trace_getrq(void *ignore, 81438516ab5SSteven Rostedt struct request_queue *q, 8152db270a8SFrederic Weisbecker struct bio *bio, int rw) 8162db270a8SFrederic Weisbecker { 8172db270a8SFrederic Weisbecker if (bio) 8182db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_GETRQ); 8192db270a8SFrederic Weisbecker else { 8202db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8212db270a8SFrederic Weisbecker 8222db270a8SFrederic Weisbecker if (bt) 8232db270a8SFrederic Weisbecker __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL); 8242db270a8SFrederic Weisbecker } 8252db270a8SFrederic Weisbecker } 8262db270a8SFrederic Weisbecker 8272db270a8SFrederic Weisbecker 82838516ab5SSteven Rostedt static void blk_add_trace_sleeprq(void *ignore, 82938516ab5SSteven Rostedt struct request_queue *q, 8302db270a8SFrederic Weisbecker struct bio *bio, int rw) 8312db270a8SFrederic Weisbecker { 8322db270a8SFrederic Weisbecker if (bio) 8332db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ); 8342db270a8SFrederic Weisbecker else { 8352db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8362db270a8SFrederic Weisbecker 8372db270a8SFrederic Weisbecker if (bt) 8382db270a8SFrederic Weisbecker __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ, 8392db270a8SFrederic Weisbecker 0, 0, NULL); 8402db270a8SFrederic Weisbecker } 8412db270a8SFrederic Weisbecker } 8422db270a8SFrederic Weisbecker 84338516ab5SSteven Rostedt static void blk_add_trace_plug(void *ignore, struct request_queue *q) 8442db270a8SFrederic Weisbecker { 8452db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8462db270a8SFrederic Weisbecker 8472db270a8SFrederic Weisbecker if (bt) 8482db270a8SFrederic Weisbecker __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL); 8492db270a8SFrederic Weisbecker } 8502db270a8SFrederic Weisbecker 85138516ab5SSteven Rostedt static void blk_add_trace_unplug_io(void *ignore, struct request_queue *q) 8522db270a8SFrederic Weisbecker { 8532db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8542db270a8SFrederic Weisbecker 8552db270a8SFrederic Weisbecker if (bt) { 8562db270a8SFrederic Weisbecker unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 8572db270a8SFrederic Weisbecker __be64 rpdu = cpu_to_be64(pdu); 8582db270a8SFrederic Weisbecker 8592db270a8SFrederic Weisbecker __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_IO, 0, 8602db270a8SFrederic Weisbecker sizeof(rpdu), &rpdu); 8612db270a8SFrederic Weisbecker } 8622db270a8SFrederic Weisbecker } 8632db270a8SFrederic Weisbecker 86438516ab5SSteven Rostedt static void blk_add_trace_unplug_timer(void *ignore, struct request_queue *q) 8652db270a8SFrederic Weisbecker { 8662db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8672db270a8SFrederic Weisbecker 8682db270a8SFrederic Weisbecker if (bt) { 8692db270a8SFrederic Weisbecker unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 8702db270a8SFrederic Weisbecker __be64 rpdu = cpu_to_be64(pdu); 8712db270a8SFrederic Weisbecker 8722db270a8SFrederic Weisbecker __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_TIMER, 0, 8732db270a8SFrederic Weisbecker sizeof(rpdu), &rpdu); 8742db270a8SFrederic Weisbecker } 8752db270a8SFrederic Weisbecker } 8762db270a8SFrederic Weisbecker 87738516ab5SSteven Rostedt static void blk_add_trace_split(void *ignore, 87838516ab5SSteven Rostedt struct request_queue *q, struct bio *bio, 8792db270a8SFrederic Weisbecker unsigned int pdu) 8802db270a8SFrederic Weisbecker { 8812db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8822db270a8SFrederic Weisbecker 8832db270a8SFrederic Weisbecker if (bt) { 8842db270a8SFrederic Weisbecker __be64 rpdu = cpu_to_be64(pdu); 8852db270a8SFrederic Weisbecker 8862db270a8SFrederic Weisbecker __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 8872db270a8SFrederic Weisbecker BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE), 8882db270a8SFrederic Weisbecker sizeof(rpdu), &rpdu); 8892db270a8SFrederic Weisbecker } 8902db270a8SFrederic Weisbecker } 8912db270a8SFrederic Weisbecker 8922db270a8SFrederic Weisbecker /** 8932db270a8SFrederic Weisbecker * blk_add_trace_remap - Add a trace for a remap operation 894546cf44aSRandy Dunlap * @ignore: trace callback data parameter (not used) 8952db270a8SFrederic Weisbecker * @q: queue the io is for 8962db270a8SFrederic Weisbecker * @bio: the source bio 8972db270a8SFrederic Weisbecker * @dev: target device 898a42aaa3bSAlan D. Brunelle * @from: source sector 8992db270a8SFrederic Weisbecker * 9002db270a8SFrederic Weisbecker * Description: 9012db270a8SFrederic Weisbecker * Device mapper or raid target sometimes need to split a bio because 9022db270a8SFrederic Weisbecker * it spans a stripe (or similar). Add a trace for that action. 9032db270a8SFrederic Weisbecker * 9042db270a8SFrederic Weisbecker **/ 90538516ab5SSteven Rostedt static void blk_add_trace_remap(void *ignore, 90638516ab5SSteven Rostedt struct request_queue *q, struct bio *bio, 90722a7c31aSAlan D. Brunelle dev_t dev, sector_t from) 9082db270a8SFrederic Weisbecker { 9092db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 9102db270a8SFrederic Weisbecker struct blk_io_trace_remap r; 9112db270a8SFrederic Weisbecker 9122db270a8SFrederic Weisbecker if (likely(!bt)) 9132db270a8SFrederic Weisbecker return; 9142db270a8SFrederic Weisbecker 915a42aaa3bSAlan D. Brunelle r.device_from = cpu_to_be32(dev); 916a42aaa3bSAlan D. Brunelle r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev); 917a42aaa3bSAlan D. Brunelle r.sector_from = cpu_to_be64(from); 9182db270a8SFrederic Weisbecker 91922a7c31aSAlan D. Brunelle __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 92022a7c31aSAlan D. Brunelle BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), 92122a7c31aSAlan D. Brunelle sizeof(r), &r); 9222db270a8SFrederic Weisbecker } 9232db270a8SFrederic Weisbecker 9242db270a8SFrederic Weisbecker /** 925b0da3f0dSJun'ichi Nomura * blk_add_trace_rq_remap - Add a trace for a request-remap operation 926546cf44aSRandy Dunlap * @ignore: trace callback data parameter (not used) 927b0da3f0dSJun'ichi Nomura * @q: queue the io is for 928b0da3f0dSJun'ichi Nomura * @rq: the source request 929b0da3f0dSJun'ichi Nomura * @dev: target device 930b0da3f0dSJun'ichi Nomura * @from: source sector 931b0da3f0dSJun'ichi Nomura * 932b0da3f0dSJun'ichi Nomura * Description: 933b0da3f0dSJun'ichi Nomura * Device mapper remaps request to other devices. 934b0da3f0dSJun'ichi Nomura * Add a trace for that action. 935b0da3f0dSJun'ichi Nomura * 936b0da3f0dSJun'ichi Nomura **/ 93738516ab5SSteven Rostedt static void blk_add_trace_rq_remap(void *ignore, 93838516ab5SSteven Rostedt struct request_queue *q, 939b0da3f0dSJun'ichi Nomura struct request *rq, dev_t dev, 940b0da3f0dSJun'ichi Nomura sector_t from) 941b0da3f0dSJun'ichi Nomura { 942b0da3f0dSJun'ichi Nomura struct blk_trace *bt = q->blk_trace; 943b0da3f0dSJun'ichi Nomura struct blk_io_trace_remap r; 944b0da3f0dSJun'ichi Nomura 945b0da3f0dSJun'ichi Nomura if (likely(!bt)) 946b0da3f0dSJun'ichi Nomura return; 947b0da3f0dSJun'ichi Nomura 948b0da3f0dSJun'ichi Nomura r.device_from = cpu_to_be32(dev); 949b0da3f0dSJun'ichi Nomura r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); 950b0da3f0dSJun'ichi Nomura r.sector_from = cpu_to_be64(from); 951b0da3f0dSJun'ichi Nomura 952b0da3f0dSJun'ichi Nomura __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 953b0da3f0dSJun'ichi Nomura rq_data_dir(rq), BLK_TA_REMAP, !!rq->errors, 954b0da3f0dSJun'ichi Nomura sizeof(r), &r); 955b0da3f0dSJun'ichi Nomura } 956b0da3f0dSJun'ichi Nomura 957b0da3f0dSJun'ichi Nomura /** 9582db270a8SFrederic Weisbecker * blk_add_driver_data - Add binary message with driver-specific data 9592db270a8SFrederic Weisbecker * @q: queue the io is for 9602db270a8SFrederic Weisbecker * @rq: io request 9612db270a8SFrederic Weisbecker * @data: driver-specific data 9622db270a8SFrederic Weisbecker * @len: length of driver-specific data 9632db270a8SFrederic Weisbecker * 9642db270a8SFrederic Weisbecker * Description: 9652db270a8SFrederic Weisbecker * Some drivers might want to write driver-specific data per request. 9662db270a8SFrederic Weisbecker * 9672db270a8SFrederic Weisbecker **/ 9682db270a8SFrederic Weisbecker void blk_add_driver_data(struct request_queue *q, 9692db270a8SFrederic Weisbecker struct request *rq, 9702db270a8SFrederic Weisbecker void *data, size_t len) 9712db270a8SFrederic Weisbecker { 9722db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 9732db270a8SFrederic Weisbecker 9742db270a8SFrederic Weisbecker if (likely(!bt)) 9752db270a8SFrederic Weisbecker return; 9762db270a8SFrederic Weisbecker 97733659ebbSChristoph Hellwig if (rq->cmd_type == REQ_TYPE_BLOCK_PC) 9782e46e8b2STejun Heo __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 9792e46e8b2STejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9802db270a8SFrederic Weisbecker else 9812e46e8b2STejun Heo __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 9822e46e8b2STejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 9832db270a8SFrederic Weisbecker } 9842db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_add_driver_data); 9852db270a8SFrederic Weisbecker 9863c289ba7SLi Zefan static void blk_register_tracepoints(void) 9872db270a8SFrederic Weisbecker { 9882db270a8SFrederic Weisbecker int ret; 9892db270a8SFrederic Weisbecker 99038516ab5SSteven Rostedt ret = register_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); 9912db270a8SFrederic Weisbecker WARN_ON(ret); 99238516ab5SSteven Rostedt ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); 9932db270a8SFrederic Weisbecker WARN_ON(ret); 99438516ab5SSteven Rostedt ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); 9952db270a8SFrederic Weisbecker WARN_ON(ret); 99638516ab5SSteven Rostedt ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); 9972db270a8SFrederic Weisbecker WARN_ON(ret); 99838516ab5SSteven Rostedt ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); 9992db270a8SFrederic Weisbecker WARN_ON(ret); 100038516ab5SSteven Rostedt ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); 10012db270a8SFrederic Weisbecker WARN_ON(ret); 100238516ab5SSteven Rostedt ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); 10032db270a8SFrederic Weisbecker WARN_ON(ret); 100438516ab5SSteven Rostedt ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); 10052db270a8SFrederic Weisbecker WARN_ON(ret); 100638516ab5SSteven Rostedt ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); 10072db270a8SFrederic Weisbecker WARN_ON(ret); 100838516ab5SSteven Rostedt ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); 10092db270a8SFrederic Weisbecker WARN_ON(ret); 101038516ab5SSteven Rostedt ret = register_trace_block_getrq(blk_add_trace_getrq, NULL); 10112db270a8SFrederic Weisbecker WARN_ON(ret); 101238516ab5SSteven Rostedt ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); 10132db270a8SFrederic Weisbecker WARN_ON(ret); 101438516ab5SSteven Rostedt ret = register_trace_block_plug(blk_add_trace_plug, NULL); 10152db270a8SFrederic Weisbecker WARN_ON(ret); 101638516ab5SSteven Rostedt ret = register_trace_block_unplug_timer(blk_add_trace_unplug_timer, NULL); 10172db270a8SFrederic Weisbecker WARN_ON(ret); 101838516ab5SSteven Rostedt ret = register_trace_block_unplug_io(blk_add_trace_unplug_io, NULL); 10192db270a8SFrederic Weisbecker WARN_ON(ret); 102038516ab5SSteven Rostedt ret = register_trace_block_split(blk_add_trace_split, NULL); 10212db270a8SFrederic Weisbecker WARN_ON(ret); 102238516ab5SSteven Rostedt ret = register_trace_block_remap(blk_add_trace_remap, NULL); 10232db270a8SFrederic Weisbecker WARN_ON(ret); 102438516ab5SSteven Rostedt ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); 1025b0da3f0dSJun'ichi Nomura WARN_ON(ret); 10262db270a8SFrederic Weisbecker } 10272db270a8SFrederic Weisbecker 10282db270a8SFrederic Weisbecker static void blk_unregister_tracepoints(void) 10292db270a8SFrederic Weisbecker { 103038516ab5SSteven Rostedt unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL); 103138516ab5SSteven Rostedt unregister_trace_block_remap(blk_add_trace_remap, NULL); 103238516ab5SSteven Rostedt unregister_trace_block_split(blk_add_trace_split, NULL); 103338516ab5SSteven Rostedt unregister_trace_block_unplug_io(blk_add_trace_unplug_io, NULL); 103438516ab5SSteven Rostedt unregister_trace_block_unplug_timer(blk_add_trace_unplug_timer, NULL); 103538516ab5SSteven Rostedt unregister_trace_block_plug(blk_add_trace_plug, NULL); 103638516ab5SSteven Rostedt unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL); 103738516ab5SSteven Rostedt unregister_trace_block_getrq(blk_add_trace_getrq, NULL); 103838516ab5SSteven Rostedt unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL); 103938516ab5SSteven Rostedt unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL); 104038516ab5SSteven Rostedt unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL); 104138516ab5SSteven Rostedt unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL); 104238516ab5SSteven Rostedt unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL); 104338516ab5SSteven Rostedt unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL); 104438516ab5SSteven Rostedt unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL); 104538516ab5SSteven Rostedt unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL); 104638516ab5SSteven Rostedt unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL); 104738516ab5SSteven Rostedt unregister_trace_block_rq_abort(blk_add_trace_rq_abort, NULL); 10482db270a8SFrederic Weisbecker 10492db270a8SFrederic Weisbecker tracepoint_synchronize_unregister(); 10502db270a8SFrederic Weisbecker } 10512db270a8SFrederic Weisbecker 10522db270a8SFrederic Weisbecker /* 10532db270a8SFrederic Weisbecker * struct blk_io_tracer formatting routines 10542db270a8SFrederic Weisbecker */ 10552db270a8SFrederic Weisbecker 10562db270a8SFrederic Weisbecker static void fill_rwbs(char *rwbs, const struct blk_io_trace *t) 10572db270a8SFrederic Weisbecker { 10582db270a8SFrederic Weisbecker int i = 0; 105965796348SLi Zefan int tc = t->action >> BLK_TC_SHIFT; 10602db270a8SFrederic Weisbecker 106118cea459SLi Zefan if (t->action == BLK_TN_MESSAGE) { 106218cea459SLi Zefan rwbs[i++] = 'N'; 106318cea459SLi Zefan goto out; 106418cea459SLi Zefan } 106518cea459SLi Zefan 106665796348SLi Zefan if (tc & BLK_TC_DISCARD) 10672db270a8SFrederic Weisbecker rwbs[i++] = 'D'; 106865796348SLi Zefan else if (tc & BLK_TC_WRITE) 10692db270a8SFrederic Weisbecker rwbs[i++] = 'W'; 10702db270a8SFrederic Weisbecker else if (t->bytes) 10712db270a8SFrederic Weisbecker rwbs[i++] = 'R'; 10722db270a8SFrederic Weisbecker else 10732db270a8SFrederic Weisbecker rwbs[i++] = 'N'; 10742db270a8SFrederic Weisbecker 107565796348SLi Zefan if (tc & BLK_TC_AHEAD) 10762db270a8SFrederic Weisbecker rwbs[i++] = 'A'; 107765796348SLi Zefan if (tc & BLK_TC_BARRIER) 10782db270a8SFrederic Weisbecker rwbs[i++] = 'B'; 107965796348SLi Zefan if (tc & BLK_TC_SYNC) 10802db270a8SFrederic Weisbecker rwbs[i++] = 'S'; 108165796348SLi Zefan if (tc & BLK_TC_META) 10822db270a8SFrederic Weisbecker rwbs[i++] = 'M'; 108318cea459SLi Zefan out: 10842db270a8SFrederic Weisbecker rwbs[i] = '\0'; 10852db270a8SFrederic Weisbecker } 10862db270a8SFrederic Weisbecker 10872db270a8SFrederic Weisbecker static inline 10882db270a8SFrederic Weisbecker const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) 10892db270a8SFrederic Weisbecker { 10902db270a8SFrederic Weisbecker return (const struct blk_io_trace *)ent; 10912db270a8SFrederic Weisbecker } 10922db270a8SFrederic Weisbecker 10932db270a8SFrederic Weisbecker static inline const void *pdu_start(const struct trace_entry *ent) 10942db270a8SFrederic Weisbecker { 10952db270a8SFrederic Weisbecker return te_blk_io_trace(ent) + 1; 10962db270a8SFrederic Weisbecker } 10972db270a8SFrederic Weisbecker 109866de7792SLi Zefan static inline u32 t_action(const struct trace_entry *ent) 109966de7792SLi Zefan { 110066de7792SLi Zefan return te_blk_io_trace(ent)->action; 110166de7792SLi Zefan } 110266de7792SLi Zefan 110366de7792SLi Zefan static inline u32 t_bytes(const struct trace_entry *ent) 110466de7792SLi Zefan { 110566de7792SLi Zefan return te_blk_io_trace(ent)->bytes; 110666de7792SLi Zefan } 110766de7792SLi Zefan 11082db270a8SFrederic Weisbecker static inline u32 t_sec(const struct trace_entry *ent) 11092db270a8SFrederic Weisbecker { 11102db270a8SFrederic Weisbecker return te_blk_io_trace(ent)->bytes >> 9; 11112db270a8SFrederic Weisbecker } 11122db270a8SFrederic Weisbecker 11132db270a8SFrederic Weisbecker static inline unsigned long long t_sector(const struct trace_entry *ent) 11142db270a8SFrederic Weisbecker { 11152db270a8SFrederic Weisbecker return te_blk_io_trace(ent)->sector; 11162db270a8SFrederic Weisbecker } 11172db270a8SFrederic Weisbecker 11182db270a8SFrederic Weisbecker static inline __u16 t_error(const struct trace_entry *ent) 11192db270a8SFrederic Weisbecker { 1120e0dc81beSLi Zefan return te_blk_io_trace(ent)->error; 11212db270a8SFrederic Weisbecker } 11222db270a8SFrederic Weisbecker 11232db270a8SFrederic Weisbecker static __u64 get_pdu_int(const struct trace_entry *ent) 11242db270a8SFrederic Weisbecker { 11252db270a8SFrederic Weisbecker const __u64 *val = pdu_start(ent); 11262db270a8SFrederic Weisbecker return be64_to_cpu(*val); 11272db270a8SFrederic Weisbecker } 11282db270a8SFrederic Weisbecker 11292db270a8SFrederic Weisbecker static void get_pdu_remap(const struct trace_entry *ent, 11302db270a8SFrederic Weisbecker struct blk_io_trace_remap *r) 11312db270a8SFrederic Weisbecker { 11322db270a8SFrederic Weisbecker const struct blk_io_trace_remap *__r = pdu_start(ent); 1133a42aaa3bSAlan D. Brunelle __u64 sector_from = __r->sector_from; 11342db270a8SFrederic Weisbecker 11352db270a8SFrederic Weisbecker r->device_from = be32_to_cpu(__r->device_from); 1136a42aaa3bSAlan D. Brunelle r->device_to = be32_to_cpu(__r->device_to); 1137a42aaa3bSAlan D. Brunelle r->sector_from = be64_to_cpu(sector_from); 11382db270a8SFrederic Weisbecker } 11392db270a8SFrederic Weisbecker 1140b6a4b0c3SLi Zefan typedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act); 1141b6a4b0c3SLi Zefan 1142b6a4b0c3SLi Zefan static int blk_log_action_classic(struct trace_iterator *iter, const char *act) 11432db270a8SFrederic Weisbecker { 11442db270a8SFrederic Weisbecker char rwbs[6]; 114535ac51bfSLi Zefan unsigned long long ts = iter->ts; 114635ac51bfSLi Zefan unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); 11472db270a8SFrederic Weisbecker unsigned secs = (unsigned long)ts; 1148b6a4b0c3SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 11492db270a8SFrederic Weisbecker 11502db270a8SFrederic Weisbecker fill_rwbs(rwbs, t); 11512db270a8SFrederic Weisbecker 11522db270a8SFrederic Weisbecker return trace_seq_printf(&iter->seq, 115335ac51bfSLi Zefan "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", 11542db270a8SFrederic Weisbecker MAJOR(t->device), MINOR(t->device), iter->cpu, 1155b6a4b0c3SLi Zefan secs, nsec_rem, iter->ent->pid, act, rwbs); 11562db270a8SFrederic Weisbecker } 11572db270a8SFrederic Weisbecker 1158b6a4b0c3SLi Zefan static int blk_log_action(struct trace_iterator *iter, const char *act) 11592db270a8SFrederic Weisbecker { 11602db270a8SFrederic Weisbecker char rwbs[6]; 1161b6a4b0c3SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1162b6a4b0c3SLi Zefan 11632db270a8SFrederic Weisbecker fill_rwbs(rwbs, t); 1164b6a4b0c3SLi Zefan return trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", 11652db270a8SFrederic Weisbecker MAJOR(t->device), MINOR(t->device), act, rwbs); 11662db270a8SFrederic Weisbecker } 11672db270a8SFrederic Weisbecker 116866de7792SLi Zefan static int blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent) 116966de7792SLi Zefan { 117004986257SLi Zefan const unsigned char *pdu_buf; 117166de7792SLi Zefan int pdu_len; 117266de7792SLi Zefan int i, end, ret; 117366de7792SLi Zefan 117466de7792SLi Zefan pdu_buf = pdu_start(ent); 117566de7792SLi Zefan pdu_len = te_blk_io_trace(ent)->pdu_len; 117666de7792SLi Zefan 117766de7792SLi Zefan if (!pdu_len) 117866de7792SLi Zefan return 1; 117966de7792SLi Zefan 118066de7792SLi Zefan /* find the last zero that needs to be printed */ 118166de7792SLi Zefan for (end = pdu_len - 1; end >= 0; end--) 118266de7792SLi Zefan if (pdu_buf[end]) 118366de7792SLi Zefan break; 118466de7792SLi Zefan end++; 118566de7792SLi Zefan 118666de7792SLi Zefan if (!trace_seq_putc(s, '(')) 118766de7792SLi Zefan return 0; 118866de7792SLi Zefan 118966de7792SLi Zefan for (i = 0; i < pdu_len; i++) { 119066de7792SLi Zefan 119166de7792SLi Zefan ret = trace_seq_printf(s, "%s%02x", 119266de7792SLi Zefan i == 0 ? "" : " ", pdu_buf[i]); 119366de7792SLi Zefan if (!ret) 119466de7792SLi Zefan return ret; 119566de7792SLi Zefan 119666de7792SLi Zefan /* 119766de7792SLi Zefan * stop when the rest is just zeroes and indicate so 119866de7792SLi Zefan * with a ".." appended 119966de7792SLi Zefan */ 120066de7792SLi Zefan if (i == end && end != pdu_len - 1) 120166de7792SLi Zefan return trace_seq_puts(s, " ..) "); 120266de7792SLi Zefan } 120366de7792SLi Zefan 120466de7792SLi Zefan return trace_seq_puts(s, ") "); 120566de7792SLi Zefan } 120666de7792SLi Zefan 12072db270a8SFrederic Weisbecker static int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent) 12082db270a8SFrederic Weisbecker { 12094ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12104ca53085SSteven Rostedt 12114ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12122db270a8SFrederic Weisbecker 121366de7792SLi Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 121466de7792SLi Zefan int ret; 121566de7792SLi Zefan 121666de7792SLi Zefan ret = trace_seq_printf(s, "%u ", t_bytes(ent)); 121766de7792SLi Zefan if (!ret) 121866de7792SLi Zefan return 0; 121966de7792SLi Zefan ret = blk_log_dump_pdu(s, ent); 122066de7792SLi Zefan if (!ret) 122166de7792SLi Zefan return 0; 122266de7792SLi Zefan return trace_seq_printf(s, "[%s]\n", cmd); 122366de7792SLi Zefan } else { 12242db270a8SFrederic Weisbecker if (t_sec(ent)) 12252db270a8SFrederic Weisbecker return trace_seq_printf(s, "%llu + %u [%s]\n", 12262db270a8SFrederic Weisbecker t_sector(ent), t_sec(ent), cmd); 12272db270a8SFrederic Weisbecker return trace_seq_printf(s, "[%s]\n", cmd); 12282db270a8SFrederic Weisbecker } 122966de7792SLi Zefan } 12302db270a8SFrederic Weisbecker 12312db270a8SFrederic Weisbecker static int blk_log_with_error(struct trace_seq *s, 12322db270a8SFrederic Weisbecker const struct trace_entry *ent) 12332db270a8SFrederic Weisbecker { 123466de7792SLi Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 123566de7792SLi Zefan int ret; 123666de7792SLi Zefan 123766de7792SLi Zefan ret = blk_log_dump_pdu(s, ent); 123866de7792SLi Zefan if (ret) 123966de7792SLi Zefan return trace_seq_printf(s, "[%d]\n", t_error(ent)); 124066de7792SLi Zefan return 0; 124166de7792SLi Zefan } else { 12422db270a8SFrederic Weisbecker if (t_sec(ent)) 124366de7792SLi Zefan return trace_seq_printf(s, "%llu + %u [%d]\n", 124466de7792SLi Zefan t_sector(ent), 12452db270a8SFrederic Weisbecker t_sec(ent), t_error(ent)); 124666de7792SLi Zefan return trace_seq_printf(s, "%llu [%d]\n", 124766de7792SLi Zefan t_sector(ent), t_error(ent)); 124866de7792SLi Zefan } 12492db270a8SFrederic Weisbecker } 12502db270a8SFrederic Weisbecker 12512db270a8SFrederic Weisbecker static int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent) 12522db270a8SFrederic Weisbecker { 1253a42aaa3bSAlan D. Brunelle struct blk_io_trace_remap r = { .device_from = 0, }; 12542db270a8SFrederic Weisbecker 12552db270a8SFrederic Weisbecker get_pdu_remap(ent, &r); 12562db270a8SFrederic Weisbecker return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", 1257a42aaa3bSAlan D. Brunelle t_sector(ent), t_sec(ent), 1258a42aaa3bSAlan D. Brunelle MAJOR(r.device_from), MINOR(r.device_from), 1259a42aaa3bSAlan D. Brunelle (unsigned long long)r.sector_from); 12602db270a8SFrederic Weisbecker } 12612db270a8SFrederic Weisbecker 12622db270a8SFrederic Weisbecker static int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent) 12632db270a8SFrederic Weisbecker { 12644ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12654ca53085SSteven Rostedt 12664ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12674ca53085SSteven Rostedt 12684ca53085SSteven Rostedt return trace_seq_printf(s, "[%s]\n", cmd); 12692db270a8SFrederic Weisbecker } 12702db270a8SFrederic Weisbecker 12712db270a8SFrederic Weisbecker static int blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent) 12722db270a8SFrederic Weisbecker { 12734ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12744ca53085SSteven Rostedt 12754ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12764ca53085SSteven Rostedt 12774ca53085SSteven Rostedt return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent)); 12782db270a8SFrederic Weisbecker } 12792db270a8SFrederic Weisbecker 12802db270a8SFrederic Weisbecker static int blk_log_split(struct trace_seq *s, const struct trace_entry *ent) 12812db270a8SFrederic Weisbecker { 12824ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 12834ca53085SSteven Rostedt 12844ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 12854ca53085SSteven Rostedt 12862db270a8SFrederic Weisbecker return trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), 12874ca53085SSteven Rostedt get_pdu_int(ent), cmd); 12882db270a8SFrederic Weisbecker } 12892db270a8SFrederic Weisbecker 129018cea459SLi Zefan static int blk_log_msg(struct trace_seq *s, const struct trace_entry *ent) 129118cea459SLi Zefan { 129218cea459SLi Zefan int ret; 129318cea459SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(ent); 129418cea459SLi Zefan 129518cea459SLi Zefan ret = trace_seq_putmem(s, t + 1, t->pdu_len); 129618cea459SLi Zefan if (ret) 129718cea459SLi Zefan return trace_seq_putc(s, '\n'); 129818cea459SLi Zefan return ret; 129918cea459SLi Zefan } 130018cea459SLi Zefan 13012db270a8SFrederic Weisbecker /* 13022db270a8SFrederic Weisbecker * struct tracer operations 13032db270a8SFrederic Weisbecker */ 13042db270a8SFrederic Weisbecker 13052db270a8SFrederic Weisbecker static void blk_tracer_print_header(struct seq_file *m) 13062db270a8SFrederic Weisbecker { 13072db270a8SFrederic Weisbecker if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 13082db270a8SFrederic Weisbecker return; 13092db270a8SFrederic Weisbecker seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" 13102db270a8SFrederic Weisbecker "# | | | | | |\n"); 13112db270a8SFrederic Weisbecker } 13122db270a8SFrederic Weisbecker 13132db270a8SFrederic Weisbecker static void blk_tracer_start(struct trace_array *tr) 13142db270a8SFrederic Weisbecker { 1315ad5dd549SLi Zefan blk_tracer_enabled = true; 13162db270a8SFrederic Weisbecker } 13172db270a8SFrederic Weisbecker 13182db270a8SFrederic Weisbecker static int blk_tracer_init(struct trace_array *tr) 13192db270a8SFrederic Weisbecker { 13202db270a8SFrederic Weisbecker blk_tr = tr; 13212db270a8SFrederic Weisbecker blk_tracer_start(tr); 13222db270a8SFrederic Weisbecker return 0; 13232db270a8SFrederic Weisbecker } 13242db270a8SFrederic Weisbecker 13252db270a8SFrederic Weisbecker static void blk_tracer_stop(struct trace_array *tr) 13262db270a8SFrederic Weisbecker { 1327ad5dd549SLi Zefan blk_tracer_enabled = false; 13282db270a8SFrederic Weisbecker } 13292db270a8SFrederic Weisbecker 13302db270a8SFrederic Weisbecker static void blk_tracer_reset(struct trace_array *tr) 13312db270a8SFrederic Weisbecker { 13322db270a8SFrederic Weisbecker blk_tracer_stop(tr); 13332db270a8SFrederic Weisbecker } 13342db270a8SFrederic Weisbecker 1335e4955c99SLi Zefan static const struct { 13362db270a8SFrederic Weisbecker const char *act[2]; 13372db270a8SFrederic Weisbecker int (*print)(struct trace_seq *s, const struct trace_entry *ent); 1338e4955c99SLi Zefan } what2act[] = { 13392db270a8SFrederic Weisbecker [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, 13402db270a8SFrederic Weisbecker [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, 13412db270a8SFrederic Weisbecker [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, 13422db270a8SFrederic Weisbecker [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, 13432db270a8SFrederic Weisbecker [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, 13442db270a8SFrederic Weisbecker [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, 13452db270a8SFrederic Weisbecker [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, 13462db270a8SFrederic Weisbecker [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, 13472db270a8SFrederic Weisbecker [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, 13482db270a8SFrederic Weisbecker [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, 13492db270a8SFrederic Weisbecker [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, 13502db270a8SFrederic Weisbecker [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, 13512db270a8SFrederic Weisbecker [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, 13522db270a8SFrederic Weisbecker [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, 13532db270a8SFrederic Weisbecker [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, 13542db270a8SFrederic Weisbecker }; 13552db270a8SFrederic Weisbecker 1356b6a4b0c3SLi Zefan static enum print_line_t print_one_line(struct trace_iterator *iter, 1357b6a4b0c3SLi Zefan bool classic) 13582db270a8SFrederic Weisbecker { 13592db270a8SFrederic Weisbecker struct trace_seq *s = &iter->seq; 1360b6a4b0c3SLi Zefan const struct blk_io_trace *t; 1361b6a4b0c3SLi Zefan u16 what; 13622db270a8SFrederic Weisbecker int ret; 1363b6a4b0c3SLi Zefan bool long_act; 1364b6a4b0c3SLi Zefan blk_log_action_t *log_action; 13652db270a8SFrederic Weisbecker 1366b6a4b0c3SLi Zefan t = te_blk_io_trace(iter->ent); 1367b6a4b0c3SLi Zefan what = t->action & ((1 << BLK_TC_SHIFT) - 1); 1368b6a4b0c3SLi Zefan long_act = !!(trace_flags & TRACE_ITER_VERBOSE); 1369b6a4b0c3SLi Zefan log_action = classic ? &blk_log_action_classic : &blk_log_action; 13702db270a8SFrederic Weisbecker 137118cea459SLi Zefan if (t->action == BLK_TN_MESSAGE) { 137218cea459SLi Zefan ret = log_action(iter, long_act ? "message" : "m"); 137318cea459SLi Zefan if (ret) 137418cea459SLi Zefan ret = blk_log_msg(s, iter->ent); 137518cea459SLi Zefan goto out; 137618cea459SLi Zefan } 137718cea459SLi Zefan 1378eb08f8ebSLi Zefan if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) 1379b78825d6SLi Zefan ret = trace_seq_printf(s, "Unknown action %x\n", what); 13802db270a8SFrederic Weisbecker else { 1381b6a4b0c3SLi Zefan ret = log_action(iter, what2act[what].act[long_act]); 13822db270a8SFrederic Weisbecker if (ret) 13832db270a8SFrederic Weisbecker ret = what2act[what].print(s, iter->ent); 13842db270a8SFrederic Weisbecker } 138518cea459SLi Zefan out: 13862db270a8SFrederic Weisbecker return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 13872db270a8SFrederic Weisbecker } 13882db270a8SFrederic Weisbecker 1389b6a4b0c3SLi Zefan static enum print_line_t blk_trace_event_print(struct trace_iterator *iter, 1390a9a57763SSteven Rostedt int flags, struct trace_event *event) 1391b6a4b0c3SLi Zefan { 1392b6a4b0c3SLi Zefan return print_one_line(iter, false); 1393b6a4b0c3SLi Zefan } 1394b6a4b0c3SLi Zefan 13952db270a8SFrederic Weisbecker static int blk_trace_synthesize_old_trace(struct trace_iterator *iter) 13962db270a8SFrederic Weisbecker { 13972db270a8SFrederic Weisbecker struct trace_seq *s = &iter->seq; 13982db270a8SFrederic Weisbecker struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; 13992db270a8SFrederic Weisbecker const int offset = offsetof(struct blk_io_trace, sector); 14002db270a8SFrederic Weisbecker struct blk_io_trace old = { 14012db270a8SFrederic Weisbecker .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, 14026c051ce0SLi Zefan .time = iter->ts, 14032db270a8SFrederic Weisbecker }; 14042db270a8SFrederic Weisbecker 14052db270a8SFrederic Weisbecker if (!trace_seq_putmem(s, &old, offset)) 14062db270a8SFrederic Weisbecker return 0; 14072db270a8SFrederic Weisbecker return trace_seq_putmem(s, &t->sector, 14082db270a8SFrederic Weisbecker sizeof(old) - offset + t->pdu_len); 14092db270a8SFrederic Weisbecker } 14102db270a8SFrederic Weisbecker 14112db270a8SFrederic Weisbecker static enum print_line_t 1412a9a57763SSteven Rostedt blk_trace_event_print_binary(struct trace_iterator *iter, int flags, 1413a9a57763SSteven Rostedt struct trace_event *event) 14142db270a8SFrederic Weisbecker { 14152db270a8SFrederic Weisbecker return blk_trace_synthesize_old_trace(iter) ? 14162db270a8SFrederic Weisbecker TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 14172db270a8SFrederic Weisbecker } 14182db270a8SFrederic Weisbecker 14192db270a8SFrederic Weisbecker static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) 14202db270a8SFrederic Weisbecker { 14212db270a8SFrederic Weisbecker if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 14222db270a8SFrederic Weisbecker return TRACE_TYPE_UNHANDLED; 14232db270a8SFrederic Weisbecker 1424b6a4b0c3SLi Zefan return print_one_line(iter, true); 14252db270a8SFrederic Weisbecker } 14262db270a8SFrederic Weisbecker 1427f3948f88SLi Zefan static int blk_tracer_set_flag(u32 old_flags, u32 bit, int set) 1428f3948f88SLi Zefan { 1429f3948f88SLi Zefan /* don't output context-info for blk_classic output */ 1430f3948f88SLi Zefan if (bit == TRACE_BLK_OPT_CLASSIC) { 1431f3948f88SLi Zefan if (set) 1432f3948f88SLi Zefan trace_flags &= ~TRACE_ITER_CONTEXT_INFO; 1433f3948f88SLi Zefan else 1434f3948f88SLi Zefan trace_flags |= TRACE_ITER_CONTEXT_INFO; 1435f3948f88SLi Zefan } 1436f3948f88SLi Zefan return 0; 1437f3948f88SLi Zefan } 1438f3948f88SLi Zefan 14392db270a8SFrederic Weisbecker static struct tracer blk_tracer __read_mostly = { 14402db270a8SFrederic Weisbecker .name = "blk", 14412db270a8SFrederic Weisbecker .init = blk_tracer_init, 14422db270a8SFrederic Weisbecker .reset = blk_tracer_reset, 14432db270a8SFrederic Weisbecker .start = blk_tracer_start, 14442db270a8SFrederic Weisbecker .stop = blk_tracer_stop, 14452db270a8SFrederic Weisbecker .print_header = blk_tracer_print_header, 14462db270a8SFrederic Weisbecker .print_line = blk_tracer_print_line, 14472db270a8SFrederic Weisbecker .flags = &blk_tracer_flags, 1448f3948f88SLi Zefan .set_flag = blk_tracer_set_flag, 14492db270a8SFrederic Weisbecker }; 14502db270a8SFrederic Weisbecker 1451a9a57763SSteven Rostedt static struct trace_event_functions trace_blk_event_funcs = { 14522db270a8SFrederic Weisbecker .trace = blk_trace_event_print, 14532db270a8SFrederic Weisbecker .binary = blk_trace_event_print_binary, 14542db270a8SFrederic Weisbecker }; 14552db270a8SFrederic Weisbecker 1456a9a57763SSteven Rostedt static struct trace_event trace_blk_event = { 1457a9a57763SSteven Rostedt .type = TRACE_BLK, 1458a9a57763SSteven Rostedt .funcs = &trace_blk_event_funcs, 1459a9a57763SSteven Rostedt }; 1460a9a57763SSteven Rostedt 14612db270a8SFrederic Weisbecker static int __init init_blk_tracer(void) 14622db270a8SFrederic Weisbecker { 14632db270a8SFrederic Weisbecker if (!register_ftrace_event(&trace_blk_event)) { 14642db270a8SFrederic Weisbecker pr_warning("Warning: could not register block events\n"); 14652db270a8SFrederic Weisbecker return 1; 14662db270a8SFrederic Weisbecker } 14672db270a8SFrederic Weisbecker 14682db270a8SFrederic Weisbecker if (register_tracer(&blk_tracer) != 0) { 14692db270a8SFrederic Weisbecker pr_warning("Warning: could not register the block tracer\n"); 14702db270a8SFrederic Weisbecker unregister_ftrace_event(&trace_blk_event); 14712db270a8SFrederic Weisbecker return 1; 14722db270a8SFrederic Weisbecker } 14732db270a8SFrederic Weisbecker 14742db270a8SFrederic Weisbecker return 0; 14752db270a8SFrederic Weisbecker } 14762db270a8SFrederic Weisbecker 14772db270a8SFrederic Weisbecker device_initcall(init_blk_tracer); 14782db270a8SFrederic Weisbecker 14792db270a8SFrederic Weisbecker static int blk_trace_remove_queue(struct request_queue *q) 14802db270a8SFrederic Weisbecker { 14812db270a8SFrederic Weisbecker struct blk_trace *bt; 14822db270a8SFrederic Weisbecker 14832db270a8SFrederic Weisbecker bt = xchg(&q->blk_trace, NULL); 14842db270a8SFrederic Weisbecker if (bt == NULL) 14852db270a8SFrederic Weisbecker return -EINVAL; 14862db270a8SFrederic Weisbecker 148717ba97e3SLi Zefan if (atomic_dec_and_test(&blk_probes_ref)) 148817ba97e3SLi Zefan blk_unregister_tracepoints(); 148917ba97e3SLi Zefan 1490ad5dd549SLi Zefan blk_trace_free(bt); 14912db270a8SFrederic Weisbecker return 0; 14922db270a8SFrederic Weisbecker } 14932db270a8SFrederic Weisbecker 14942db270a8SFrederic Weisbecker /* 14952db270a8SFrederic Weisbecker * Setup everything required to start tracing 14962db270a8SFrederic Weisbecker */ 14979908c309SLi Zefan static int blk_trace_setup_queue(struct request_queue *q, 14989908c309SLi Zefan struct block_device *bdev) 14992db270a8SFrederic Weisbecker { 15002db270a8SFrederic Weisbecker struct blk_trace *old_bt, *bt = NULL; 150118cea459SLi Zefan int ret = -ENOMEM; 15022db270a8SFrederic Weisbecker 15032db270a8SFrederic Weisbecker bt = kzalloc(sizeof(*bt), GFP_KERNEL); 15042db270a8SFrederic Weisbecker if (!bt) 150515152e44SLi Zefan return -ENOMEM; 15062db270a8SFrederic Weisbecker 150718cea459SLi Zefan bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 150818cea459SLi Zefan if (!bt->msg_data) 150918cea459SLi Zefan goto free_bt; 151018cea459SLi Zefan 15119908c309SLi Zefan bt->dev = bdev->bd_dev; 15122db270a8SFrederic Weisbecker bt->act_mask = (u16)-1; 15139908c309SLi Zefan 15149908c309SLi Zefan blk_trace_setup_lba(bt, bdev); 15152db270a8SFrederic Weisbecker 15162db270a8SFrederic Weisbecker old_bt = xchg(&q->blk_trace, bt); 15172db270a8SFrederic Weisbecker if (old_bt != NULL) { 15182db270a8SFrederic Weisbecker (void)xchg(&q->blk_trace, old_bt); 151918cea459SLi Zefan ret = -EBUSY; 152018cea459SLi Zefan goto free_bt; 15212db270a8SFrederic Weisbecker } 152215152e44SLi Zefan 152317ba97e3SLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 152417ba97e3SLi Zefan blk_register_tracepoints(); 15252db270a8SFrederic Weisbecker return 0; 152618cea459SLi Zefan 152718cea459SLi Zefan free_bt: 152818cea459SLi Zefan blk_trace_free(bt); 152918cea459SLi Zefan return ret; 15302db270a8SFrederic Weisbecker } 15312db270a8SFrederic Weisbecker 15322db270a8SFrederic Weisbecker /* 15332db270a8SFrederic Weisbecker * sysfs interface to enable and configure tracing 15342db270a8SFrederic Weisbecker */ 15352db270a8SFrederic Weisbecker 15362db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_show(struct device *dev, 15372db270a8SFrederic Weisbecker struct device_attribute *attr, 15382db270a8SFrederic Weisbecker char *buf); 15392db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_store(struct device *dev, 15402db270a8SFrederic Weisbecker struct device_attribute *attr, 15412db270a8SFrederic Weisbecker const char *buf, size_t count); 15422db270a8SFrederic Weisbecker #define BLK_TRACE_DEVICE_ATTR(_name) \ 15432db270a8SFrederic Weisbecker DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ 15442db270a8SFrederic Weisbecker sysfs_blk_trace_attr_show, \ 15452db270a8SFrederic Weisbecker sysfs_blk_trace_attr_store) 15462db270a8SFrederic Weisbecker 1547cd649b8bSLi Zefan static BLK_TRACE_DEVICE_ATTR(enable); 15482db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(act_mask); 15492db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(pid); 15502db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(start_lba); 15512db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(end_lba); 15522db270a8SFrederic Weisbecker 15532db270a8SFrederic Weisbecker static struct attribute *blk_trace_attrs[] = { 15542db270a8SFrederic Weisbecker &dev_attr_enable.attr, 15552db270a8SFrederic Weisbecker &dev_attr_act_mask.attr, 15562db270a8SFrederic Weisbecker &dev_attr_pid.attr, 15572db270a8SFrederic Weisbecker &dev_attr_start_lba.attr, 15582db270a8SFrederic Weisbecker &dev_attr_end_lba.attr, 15592db270a8SFrederic Weisbecker NULL 15602db270a8SFrederic Weisbecker }; 15612db270a8SFrederic Weisbecker 15622db270a8SFrederic Weisbecker struct attribute_group blk_trace_attr_group = { 15632db270a8SFrederic Weisbecker .name = "trace", 15642db270a8SFrederic Weisbecker .attrs = blk_trace_attrs, 15652db270a8SFrederic Weisbecker }; 15662db270a8SFrederic Weisbecker 156709341997SLi Zefan static const struct { 156809341997SLi Zefan int mask; 156909341997SLi Zefan const char *str; 157009341997SLi Zefan } mask_maps[] = { 157109341997SLi Zefan { BLK_TC_READ, "read" }, 157209341997SLi Zefan { BLK_TC_WRITE, "write" }, 157309341997SLi Zefan { BLK_TC_BARRIER, "barrier" }, 157409341997SLi Zefan { BLK_TC_SYNC, "sync" }, 157509341997SLi Zefan { BLK_TC_QUEUE, "queue" }, 157609341997SLi Zefan { BLK_TC_REQUEUE, "requeue" }, 157709341997SLi Zefan { BLK_TC_ISSUE, "issue" }, 157809341997SLi Zefan { BLK_TC_COMPLETE, "complete" }, 157909341997SLi Zefan { BLK_TC_FS, "fs" }, 158009341997SLi Zefan { BLK_TC_PC, "pc" }, 158109341997SLi Zefan { BLK_TC_AHEAD, "ahead" }, 158209341997SLi Zefan { BLK_TC_META, "meta" }, 158309341997SLi Zefan { BLK_TC_DISCARD, "discard" }, 158409341997SLi Zefan { BLK_TC_DRV_DATA, "drv_data" }, 158509341997SLi Zefan }; 158609341997SLi Zefan 158709341997SLi Zefan static int blk_trace_str2mask(const char *str) 15882db270a8SFrederic Weisbecker { 158909341997SLi Zefan int i; 15902db270a8SFrederic Weisbecker int mask = 0; 15919eb85125SLi Zefan char *buf, *s, *token; 15922db270a8SFrederic Weisbecker 15939eb85125SLi Zefan buf = kstrdup(str, GFP_KERNEL); 15949eb85125SLi Zefan if (buf == NULL) 15952db270a8SFrederic Weisbecker return -ENOMEM; 15969eb85125SLi Zefan s = strstrip(buf); 15972db270a8SFrederic Weisbecker 15982db270a8SFrederic Weisbecker while (1) { 159909341997SLi Zefan token = strsep(&s, ","); 160009341997SLi Zefan if (token == NULL) 16012db270a8SFrederic Weisbecker break; 16022db270a8SFrederic Weisbecker 160309341997SLi Zefan if (*token == '\0') 160409341997SLi Zefan continue; 160509341997SLi Zefan 160609341997SLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 160709341997SLi Zefan if (strcasecmp(token, mask_maps[i].str) == 0) { 160809341997SLi Zefan mask |= mask_maps[i].mask; 160909341997SLi Zefan break; 16102db270a8SFrederic Weisbecker } 161109341997SLi Zefan } 161209341997SLi Zefan if (i == ARRAY_SIZE(mask_maps)) { 161309341997SLi Zefan mask = -EINVAL; 161409341997SLi Zefan break; 161509341997SLi Zefan } 161609341997SLi Zefan } 16179eb85125SLi Zefan kfree(buf); 16182db270a8SFrederic Weisbecker 16192db270a8SFrederic Weisbecker return mask; 16202db270a8SFrederic Weisbecker } 16212db270a8SFrederic Weisbecker 162209341997SLi Zefan static ssize_t blk_trace_mask2str(char *buf, int mask) 162309341997SLi Zefan { 162409341997SLi Zefan int i; 162509341997SLi Zefan char *p = buf; 162609341997SLi Zefan 162709341997SLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 162809341997SLi Zefan if (mask & mask_maps[i].mask) { 162909341997SLi Zefan p += sprintf(p, "%s%s", 163009341997SLi Zefan (p == buf) ? "" : ",", mask_maps[i].str); 163109341997SLi Zefan } 163209341997SLi Zefan } 163309341997SLi Zefan *p++ = '\n'; 163409341997SLi Zefan 163509341997SLi Zefan return p - buf; 163609341997SLi Zefan } 163709341997SLi Zefan 1638b125130bSLi Zefan static struct request_queue *blk_trace_get_queue(struct block_device *bdev) 1639b125130bSLi Zefan { 1640b125130bSLi Zefan if (bdev->bd_disk == NULL) 1641b125130bSLi Zefan return NULL; 1642b125130bSLi Zefan 1643b125130bSLi Zefan return bdev_get_queue(bdev); 1644b125130bSLi Zefan } 1645b125130bSLi Zefan 16462db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_show(struct device *dev, 16472db270a8SFrederic Weisbecker struct device_attribute *attr, 16482db270a8SFrederic Weisbecker char *buf) 16492db270a8SFrederic Weisbecker { 16502db270a8SFrederic Weisbecker struct hd_struct *p = dev_to_part(dev); 16512db270a8SFrederic Weisbecker struct request_queue *q; 16522db270a8SFrederic Weisbecker struct block_device *bdev; 16532db270a8SFrederic Weisbecker ssize_t ret = -ENXIO; 16542db270a8SFrederic Weisbecker 16552db270a8SFrederic Weisbecker lock_kernel(); 16562db270a8SFrederic Weisbecker bdev = bdget(part_devt(p)); 16572db270a8SFrederic Weisbecker if (bdev == NULL) 16582db270a8SFrederic Weisbecker goto out_unlock_kernel; 16592db270a8SFrederic Weisbecker 1660b125130bSLi Zefan q = blk_trace_get_queue(bdev); 16612db270a8SFrederic Weisbecker if (q == NULL) 16622db270a8SFrederic Weisbecker goto out_bdput; 1663b125130bSLi Zefan 16642db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 1665cd649b8bSLi Zefan 1666cd649b8bSLi Zefan if (attr == &dev_attr_enable) { 1667cd649b8bSLi Zefan ret = sprintf(buf, "%u\n", !!q->blk_trace); 1668cd649b8bSLi Zefan goto out_unlock_bdev; 1669cd649b8bSLi Zefan } 1670cd649b8bSLi Zefan 16712db270a8SFrederic Weisbecker if (q->blk_trace == NULL) 16722db270a8SFrederic Weisbecker ret = sprintf(buf, "disabled\n"); 16732db270a8SFrederic Weisbecker else if (attr == &dev_attr_act_mask) 167409341997SLi Zefan ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); 16752db270a8SFrederic Weisbecker else if (attr == &dev_attr_pid) 16762db270a8SFrederic Weisbecker ret = sprintf(buf, "%u\n", q->blk_trace->pid); 16772db270a8SFrederic Weisbecker else if (attr == &dev_attr_start_lba) 16782db270a8SFrederic Weisbecker ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); 16792db270a8SFrederic Weisbecker else if (attr == &dev_attr_end_lba) 16802db270a8SFrederic Weisbecker ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); 1681cd649b8bSLi Zefan 1682cd649b8bSLi Zefan out_unlock_bdev: 16832db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 16842db270a8SFrederic Weisbecker out_bdput: 16852db270a8SFrederic Weisbecker bdput(bdev); 16862db270a8SFrederic Weisbecker out_unlock_kernel: 16872db270a8SFrederic Weisbecker unlock_kernel(); 16882db270a8SFrederic Weisbecker return ret; 16892db270a8SFrederic Weisbecker } 16902db270a8SFrederic Weisbecker 16912db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_store(struct device *dev, 16922db270a8SFrederic Weisbecker struct device_attribute *attr, 16932db270a8SFrederic Weisbecker const char *buf, size_t count) 16942db270a8SFrederic Weisbecker { 16952db270a8SFrederic Weisbecker struct block_device *bdev; 16962db270a8SFrederic Weisbecker struct request_queue *q; 16972db270a8SFrederic Weisbecker struct hd_struct *p; 16982db270a8SFrederic Weisbecker u64 value; 169909341997SLi Zefan ssize_t ret = -EINVAL; 17002db270a8SFrederic Weisbecker 17012db270a8SFrederic Weisbecker if (count == 0) 17022db270a8SFrederic Weisbecker goto out; 17032db270a8SFrederic Weisbecker 17042db270a8SFrederic Weisbecker if (attr == &dev_attr_act_mask) { 17052db270a8SFrederic Weisbecker if (sscanf(buf, "%llx", &value) != 1) { 17062db270a8SFrederic Weisbecker /* Assume it is a list of trace category names */ 170709341997SLi Zefan ret = blk_trace_str2mask(buf); 170809341997SLi Zefan if (ret < 0) 17092db270a8SFrederic Weisbecker goto out; 171009341997SLi Zefan value = ret; 17112db270a8SFrederic Weisbecker } 17122db270a8SFrederic Weisbecker } else if (sscanf(buf, "%llu", &value) != 1) 17132db270a8SFrederic Weisbecker goto out; 17142db270a8SFrederic Weisbecker 171509341997SLi Zefan ret = -ENXIO; 171609341997SLi Zefan 17172db270a8SFrederic Weisbecker lock_kernel(); 17182db270a8SFrederic Weisbecker p = dev_to_part(dev); 17192db270a8SFrederic Weisbecker bdev = bdget(part_devt(p)); 17202db270a8SFrederic Weisbecker if (bdev == NULL) 17212db270a8SFrederic Weisbecker goto out_unlock_kernel; 17222db270a8SFrederic Weisbecker 1723b125130bSLi Zefan q = blk_trace_get_queue(bdev); 17242db270a8SFrederic Weisbecker if (q == NULL) 17252db270a8SFrederic Weisbecker goto out_bdput; 17262db270a8SFrederic Weisbecker 17272db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 1728cd649b8bSLi Zefan 1729cd649b8bSLi Zefan if (attr == &dev_attr_enable) { 1730cd649b8bSLi Zefan if (value) 17319908c309SLi Zefan ret = blk_trace_setup_queue(q, bdev); 1732cd649b8bSLi Zefan else 1733cd649b8bSLi Zefan ret = blk_trace_remove_queue(q); 1734cd649b8bSLi Zefan goto out_unlock_bdev; 1735cd649b8bSLi Zefan } 1736cd649b8bSLi Zefan 17372db270a8SFrederic Weisbecker ret = 0; 17382db270a8SFrederic Weisbecker if (q->blk_trace == NULL) 17399908c309SLi Zefan ret = blk_trace_setup_queue(q, bdev); 17402db270a8SFrederic Weisbecker 17412db270a8SFrederic Weisbecker if (ret == 0) { 17422db270a8SFrederic Weisbecker if (attr == &dev_attr_act_mask) 17432db270a8SFrederic Weisbecker q->blk_trace->act_mask = value; 17442db270a8SFrederic Weisbecker else if (attr == &dev_attr_pid) 17452db270a8SFrederic Weisbecker q->blk_trace->pid = value; 17462db270a8SFrederic Weisbecker else if (attr == &dev_attr_start_lba) 17472db270a8SFrederic Weisbecker q->blk_trace->start_lba = value; 17482db270a8SFrederic Weisbecker else if (attr == &dev_attr_end_lba) 17492db270a8SFrederic Weisbecker q->blk_trace->end_lba = value; 17502db270a8SFrederic Weisbecker } 1751cd649b8bSLi Zefan 1752cd649b8bSLi Zefan out_unlock_bdev: 17532db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 17542db270a8SFrederic Weisbecker out_bdput: 17552db270a8SFrederic Weisbecker bdput(bdev); 17562db270a8SFrederic Weisbecker out_unlock_kernel: 17572db270a8SFrederic Weisbecker unlock_kernel(); 17582db270a8SFrederic Weisbecker out: 1759cd649b8bSLi Zefan return ret ? ret : count; 17602db270a8SFrederic Weisbecker } 1761cd649b8bSLi Zefan 17621d54ad6dSLi Zefan int blk_trace_init_sysfs(struct device *dev) 17631d54ad6dSLi Zefan { 17641d54ad6dSLi Zefan return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); 17651d54ad6dSLi Zefan } 17661d54ad6dSLi Zefan 176748c0d4d4SZdenek Kabelac void blk_trace_remove_sysfs(struct device *dev) 176848c0d4d4SZdenek Kabelac { 176948c0d4d4SZdenek Kabelac sysfs_remove_group(&dev->kobj, &blk_trace_attr_group); 177048c0d4d4SZdenek Kabelac } 177148c0d4d4SZdenek Kabelac 177255782138SLi Zefan #endif /* CONFIG_BLK_DEV_IO_TRACE */ 177355782138SLi Zefan 177455782138SLi Zefan #ifdef CONFIG_EVENT_TRACING 177555782138SLi Zefan 177655782138SLi Zefan void blk_dump_cmd(char *buf, struct request *rq) 177755782138SLi Zefan { 177855782138SLi Zefan int i, end; 177955782138SLi Zefan int len = rq->cmd_len; 178055782138SLi Zefan unsigned char *cmd = rq->cmd; 178155782138SLi Zefan 178233659ebbSChristoph Hellwig if (rq->cmd_type != REQ_TYPE_BLOCK_PC) { 178355782138SLi Zefan buf[0] = '\0'; 178455782138SLi Zefan return; 178555782138SLi Zefan } 178655782138SLi Zefan 178755782138SLi Zefan for (end = len - 1; end >= 0; end--) 178855782138SLi Zefan if (cmd[end]) 178955782138SLi Zefan break; 179055782138SLi Zefan end++; 179155782138SLi Zefan 179255782138SLi Zefan for (i = 0; i < len; i++) { 179355782138SLi Zefan buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]); 179455782138SLi Zefan if (i == end && end != len - 1) { 179555782138SLi Zefan sprintf(buf, " .."); 179655782138SLi Zefan break; 179755782138SLi Zefan } 179855782138SLi Zefan } 179955782138SLi Zefan } 180055782138SLi Zefan 180155782138SLi Zefan void blk_fill_rwbs(char *rwbs, u32 rw, int bytes) 180255782138SLi Zefan { 180355782138SLi Zefan int i = 0; 180455782138SLi Zefan 180555782138SLi Zefan if (rw & WRITE) 180655782138SLi Zefan rwbs[i++] = 'W'; 18077b6d91daSChristoph Hellwig else if (rw & REQ_DISCARD) 180855782138SLi Zefan rwbs[i++] = 'D'; 180955782138SLi Zefan else if (bytes) 181055782138SLi Zefan rwbs[i++] = 'R'; 181155782138SLi Zefan else 181255782138SLi Zefan rwbs[i++] = 'N'; 181355782138SLi Zefan 18147b6d91daSChristoph Hellwig if (rw & REQ_RAHEAD) 181555782138SLi Zefan rwbs[i++] = 'A'; 18167b6d91daSChristoph Hellwig if (rw & REQ_HARDBARRIER) 181755782138SLi Zefan rwbs[i++] = 'B'; 18187b6d91daSChristoph Hellwig if (rw & REQ_SYNC) 181955782138SLi Zefan rwbs[i++] = 'S'; 18207b6d91daSChristoph Hellwig if (rw & REQ_META) 182155782138SLi Zefan rwbs[i++] = 'M'; 18228d57a98cSAdrian Hunter if (rw & REQ_SECURE) 18238d57a98cSAdrian Hunter rwbs[i++] = 'E'; 182455782138SLi Zefan 182555782138SLi Zefan rwbs[i] = '\0'; 182655782138SLi Zefan } 182755782138SLi Zefan 182855782138SLi Zefan void blk_fill_rwbs_rq(char *rwbs, struct request *rq) 182955782138SLi Zefan { 183055782138SLi Zefan int rw = rq->cmd_flags & 0x03; 183155782138SLi Zefan int bytes; 183255782138SLi Zefan 183333659ebbSChristoph Hellwig if (rq->cmd_flags & REQ_DISCARD) 18347b6d91daSChristoph Hellwig rw |= REQ_DISCARD; 183555782138SLi Zefan 18368d57a98cSAdrian Hunter if (rq->cmd_flags & REQ_SECURE) 18378d57a98cSAdrian Hunter rw |= REQ_SECURE; 18388d57a98cSAdrian Hunter 1839c9059598SLinus Torvalds bytes = blk_rq_bytes(rq); 184055782138SLi Zefan 184155782138SLi Zefan blk_fill_rwbs(rwbs, rw, bytes); 184255782138SLi Zefan } 184355782138SLi Zefan 184455782138SLi Zefan #endif /* CONFIG_EVENT_TRACING */ 184555782138SLi Zefan 1846