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> 242db270a8SFrederic Weisbecker #include <linux/debugfs.h> 252db270a8SFrederic Weisbecker #include <linux/time.h> 262db270a8SFrederic Weisbecker #include <linux/uaccess.h> 2755782138SLi Zefan 2855782138SLi Zefan #include <trace/events/block.h> 2955782138SLi Zefan 302db270a8SFrederic Weisbecker #include "trace_output.h" 312db270a8SFrederic Weisbecker 3255782138SLi Zefan #ifdef CONFIG_BLK_DEV_IO_TRACE 3355782138SLi Zefan 342db270a8SFrederic Weisbecker static unsigned int blktrace_seq __read_mostly = 1; 352db270a8SFrederic Weisbecker 362db270a8SFrederic Weisbecker static struct trace_array *blk_tr; 375006ea73SLi Zefan static bool blk_tracer_enabled __read_mostly; 382db270a8SFrederic Weisbecker 392db270a8SFrederic Weisbecker /* Select an alternative, minimalistic output than the original one */ 402db270a8SFrederic Weisbecker #define TRACE_BLK_OPT_CLASSIC 0x1 412db270a8SFrederic Weisbecker 422db270a8SFrederic Weisbecker static struct tracer_opt blk_tracer_opts[] = { 432db270a8SFrederic Weisbecker /* Default disable the minimalistic output */ 442db270a8SFrederic Weisbecker { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) }, 452db270a8SFrederic Weisbecker { } 462db270a8SFrederic Weisbecker }; 472db270a8SFrederic Weisbecker 482db270a8SFrederic Weisbecker static struct tracer_flags blk_tracer_flags = { 492db270a8SFrederic Weisbecker .val = 0, 502db270a8SFrederic Weisbecker .opts = blk_tracer_opts, 512db270a8SFrederic Weisbecker }; 522db270a8SFrederic Weisbecker 532db270a8SFrederic Weisbecker /* Global reference count of probes */ 542db270a8SFrederic Weisbecker static atomic_t blk_probes_ref = ATOMIC_INIT(0); 552db270a8SFrederic Weisbecker 563c289ba7SLi Zefan static void blk_register_tracepoints(void); 572db270a8SFrederic Weisbecker static void blk_unregister_tracepoints(void); 582db270a8SFrederic Weisbecker 592db270a8SFrederic Weisbecker /* 602db270a8SFrederic Weisbecker * Send out a notify message. 612db270a8SFrederic Weisbecker */ 622db270a8SFrederic Weisbecker static void trace_note(struct blk_trace *bt, pid_t pid, int action, 632db270a8SFrederic Weisbecker const void *data, size_t len) 642db270a8SFrederic Weisbecker { 652db270a8SFrederic Weisbecker struct blk_io_trace *t; 6618cea459SLi Zefan struct ring_buffer_event *event = NULL; 6718cea459SLi Zefan int pc = 0; 6818cea459SLi Zefan int cpu = smp_processor_id(); 6918cea459SLi Zefan bool blk_tracer = blk_tracer_enabled; 7018cea459SLi Zefan 7118cea459SLi Zefan if (blk_tracer) { 7218cea459SLi Zefan pc = preempt_count(); 7318cea459SLi Zefan event = trace_buffer_lock_reserve(blk_tr, TRACE_BLK, 7418cea459SLi Zefan sizeof(*t) + len, 7518cea459SLi Zefan 0, pc); 7618cea459SLi Zefan if (!event) 7718cea459SLi Zefan return; 7818cea459SLi Zefan t = ring_buffer_event_data(event); 7918cea459SLi Zefan goto record_it; 8018cea459SLi Zefan } 812db270a8SFrederic Weisbecker 822db270a8SFrederic Weisbecker if (!bt->rchan) 832db270a8SFrederic Weisbecker return; 842db270a8SFrederic Weisbecker 852db270a8SFrederic Weisbecker t = relay_reserve(bt->rchan, sizeof(*t) + len); 862db270a8SFrederic Weisbecker if (t) { 872db270a8SFrederic Weisbecker t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 882db270a8SFrederic Weisbecker t->time = ktime_to_ns(ktime_get()); 8918cea459SLi Zefan record_it: 902db270a8SFrederic Weisbecker t->device = bt->dev; 912db270a8SFrederic Weisbecker t->action = action; 922db270a8SFrederic Weisbecker t->pid = pid; 932db270a8SFrederic Weisbecker t->cpu = cpu; 942db270a8SFrederic Weisbecker t->pdu_len = len; 952db270a8SFrederic Weisbecker memcpy((void *) t + sizeof(*t), data, len); 9618cea459SLi Zefan 9718cea459SLi Zefan if (blk_tracer) 9818cea459SLi Zefan trace_buffer_unlock_commit(blk_tr, event, 0, pc); 992db270a8SFrederic Weisbecker } 1002db270a8SFrederic Weisbecker } 1012db270a8SFrederic Weisbecker 1022db270a8SFrederic Weisbecker /* 1032db270a8SFrederic Weisbecker * Send out a notify for this process, if we haven't done so since a trace 1042db270a8SFrederic Weisbecker * started 1052db270a8SFrederic Weisbecker */ 1062db270a8SFrederic Weisbecker static void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk) 1072db270a8SFrederic Weisbecker { 1082db270a8SFrederic Weisbecker tsk->btrace_seq = blktrace_seq; 1092db270a8SFrederic Weisbecker trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm)); 1102db270a8SFrederic Weisbecker } 1112db270a8SFrederic Weisbecker 1122db270a8SFrederic Weisbecker static void trace_note_time(struct blk_trace *bt) 1132db270a8SFrederic Weisbecker { 1142db270a8SFrederic Weisbecker struct timespec now; 1152db270a8SFrederic Weisbecker unsigned long flags; 1162db270a8SFrederic Weisbecker u32 words[2]; 1172db270a8SFrederic Weisbecker 1182db270a8SFrederic Weisbecker getnstimeofday(&now); 1192db270a8SFrederic Weisbecker words[0] = now.tv_sec; 1202db270a8SFrederic Weisbecker words[1] = now.tv_nsec; 1212db270a8SFrederic Weisbecker 1222db270a8SFrederic Weisbecker local_irq_save(flags); 1232db270a8SFrederic Weisbecker trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words)); 1242db270a8SFrederic Weisbecker local_irq_restore(flags); 1252db270a8SFrederic Weisbecker } 1262db270a8SFrederic Weisbecker 1272db270a8SFrederic Weisbecker void __trace_note_message(struct blk_trace *bt, const char *fmt, ...) 1282db270a8SFrederic Weisbecker { 1292db270a8SFrederic Weisbecker int n; 1302db270a8SFrederic Weisbecker va_list args; 1312db270a8SFrederic Weisbecker unsigned long flags; 1322db270a8SFrederic Weisbecker char *buf; 1332db270a8SFrederic Weisbecker 13418cea459SLi Zefan if (unlikely(bt->trace_state != Blktrace_running && 13518cea459SLi Zefan !blk_tracer_enabled)) 1362db270a8SFrederic Weisbecker return; 1372db270a8SFrederic Weisbecker 1382db270a8SFrederic Weisbecker local_irq_save(flags); 1392db270a8SFrederic Weisbecker buf = per_cpu_ptr(bt->msg_data, smp_processor_id()); 1402db270a8SFrederic Weisbecker va_start(args, fmt); 1412db270a8SFrederic Weisbecker n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args); 1422db270a8SFrederic Weisbecker va_end(args); 1432db270a8SFrederic Weisbecker 1442db270a8SFrederic Weisbecker trace_note(bt, 0, BLK_TN_MESSAGE, buf, n); 1452db270a8SFrederic Weisbecker local_irq_restore(flags); 1462db270a8SFrederic Weisbecker } 1472db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(__trace_note_message); 1482db270a8SFrederic Weisbecker 1492db270a8SFrederic Weisbecker static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, 1502db270a8SFrederic Weisbecker pid_t pid) 1512db270a8SFrederic Weisbecker { 1522db270a8SFrederic Weisbecker if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0) 1532db270a8SFrederic Weisbecker return 1; 154d0deef5bSShawn Du if (sector && (sector < bt->start_lba || sector > bt->end_lba)) 1552db270a8SFrederic Weisbecker return 1; 1562db270a8SFrederic Weisbecker if (bt->pid && pid != bt->pid) 1572db270a8SFrederic Weisbecker return 1; 1582db270a8SFrederic Weisbecker 1592db270a8SFrederic Weisbecker return 0; 1602db270a8SFrederic Weisbecker } 1612db270a8SFrederic Weisbecker 1622db270a8SFrederic Weisbecker /* 1632db270a8SFrederic Weisbecker * Data direction bit lookup 1642db270a8SFrederic Weisbecker */ 165e4955c99SLi Zefan static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ), 1662db270a8SFrederic Weisbecker BLK_TC_ACT(BLK_TC_WRITE) }; 1672db270a8SFrederic Weisbecker 1682db270a8SFrederic Weisbecker /* The ilog2() calls fall out because they're constant */ 1692db270a8SFrederic Weisbecker #define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \ 1702db270a8SFrederic Weisbecker (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name)) 1712db270a8SFrederic Weisbecker 1722db270a8SFrederic Weisbecker /* 1732db270a8SFrederic Weisbecker * The worker for the various blk_add_trace*() types. Fills out a 1742db270a8SFrederic Weisbecker * blk_io_trace structure and places it in a per-cpu subbuffer. 1752db270a8SFrederic Weisbecker */ 1762db270a8SFrederic Weisbecker static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, 1772db270a8SFrederic Weisbecker int rw, u32 what, int error, int pdu_len, void *pdu_data) 1782db270a8SFrederic Weisbecker { 1792db270a8SFrederic Weisbecker struct task_struct *tsk = current; 1802db270a8SFrederic Weisbecker struct ring_buffer_event *event = NULL; 1812db270a8SFrederic Weisbecker struct blk_io_trace *t; 1822db270a8SFrederic Weisbecker unsigned long flags = 0; 1832db270a8SFrederic Weisbecker unsigned long *sequence; 1842db270a8SFrederic Weisbecker pid_t pid; 1852db270a8SFrederic Weisbecker int cpu, pc = 0; 18618cea459SLi Zefan bool blk_tracer = blk_tracer_enabled; 1872db270a8SFrederic Weisbecker 18818cea459SLi Zefan if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer)) 1892db270a8SFrederic Weisbecker return; 1902db270a8SFrederic Weisbecker 1912db270a8SFrederic Weisbecker what |= ddir_act[rw & WRITE]; 1922db270a8SFrederic Weisbecker what |= MASK_TC_BIT(rw, BARRIER); 19372c26c9aSIngo Molnar what |= MASK_TC_BIT(rw, SYNCIO); 1942db270a8SFrederic Weisbecker what |= MASK_TC_BIT(rw, AHEAD); 1952db270a8SFrederic Weisbecker what |= MASK_TC_BIT(rw, META); 1962db270a8SFrederic Weisbecker what |= MASK_TC_BIT(rw, DISCARD); 1972db270a8SFrederic Weisbecker 1982db270a8SFrederic Weisbecker pid = tsk->pid; 199d0deef5bSShawn Du if (act_log_check(bt, what, sector, pid)) 2002db270a8SFrederic Weisbecker return; 2012db270a8SFrederic Weisbecker cpu = raw_smp_processor_id(); 2022db270a8SFrederic Weisbecker 20318cea459SLi Zefan if (blk_tracer) { 2042db270a8SFrederic Weisbecker tracing_record_cmdline(current); 2052db270a8SFrederic Weisbecker 2062db270a8SFrederic Weisbecker pc = preempt_count(); 2072db270a8SFrederic Weisbecker event = trace_buffer_lock_reserve(blk_tr, TRACE_BLK, 2082db270a8SFrederic Weisbecker sizeof(*t) + pdu_len, 2092db270a8SFrederic Weisbecker 0, pc); 2102db270a8SFrederic Weisbecker if (!event) 2112db270a8SFrederic Weisbecker return; 2122db270a8SFrederic Weisbecker t = ring_buffer_event_data(event); 2132db270a8SFrederic Weisbecker goto record_it; 2142db270a8SFrederic Weisbecker } 2152db270a8SFrederic Weisbecker 2162db270a8SFrederic Weisbecker /* 2172db270a8SFrederic Weisbecker * A word about the locking here - we disable interrupts to reserve 2182db270a8SFrederic Weisbecker * some space in the relay per-cpu buffer, to prevent an irq 2192db270a8SFrederic Weisbecker * from coming in and stepping on our toes. 2202db270a8SFrederic Weisbecker */ 2212db270a8SFrederic Weisbecker local_irq_save(flags); 2222db270a8SFrederic Weisbecker 2232db270a8SFrederic Weisbecker if (unlikely(tsk->btrace_seq != blktrace_seq)) 2242db270a8SFrederic Weisbecker trace_note_tsk(bt, tsk); 2252db270a8SFrederic Weisbecker 2262db270a8SFrederic Weisbecker t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len); 2272db270a8SFrederic Weisbecker if (t) { 2282db270a8SFrederic Weisbecker sequence = per_cpu_ptr(bt->sequence, cpu); 2292db270a8SFrederic Weisbecker 2302db270a8SFrederic Weisbecker t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; 2312db270a8SFrederic Weisbecker t->sequence = ++(*sequence); 2322db270a8SFrederic Weisbecker t->time = ktime_to_ns(ktime_get()); 2332db270a8SFrederic Weisbecker record_it: 2342db270a8SFrederic Weisbecker /* 2352db270a8SFrederic Weisbecker * These two are not needed in ftrace as they are in the 2362db270a8SFrederic Weisbecker * generic trace_entry, filled by tracing_generic_entry_update, 2372db270a8SFrederic Weisbecker * but for the trace_event->bin() synthesizer benefit we do it 2382db270a8SFrederic Weisbecker * here too. 2392db270a8SFrederic Weisbecker */ 2402db270a8SFrederic Weisbecker t->cpu = cpu; 2412db270a8SFrederic Weisbecker t->pid = pid; 2422db270a8SFrederic Weisbecker 2432db270a8SFrederic Weisbecker t->sector = sector; 2442db270a8SFrederic Weisbecker t->bytes = bytes; 2452db270a8SFrederic Weisbecker t->action = what; 2462db270a8SFrederic Weisbecker t->device = bt->dev; 2472db270a8SFrederic Weisbecker t->error = error; 2482db270a8SFrederic Weisbecker t->pdu_len = pdu_len; 2492db270a8SFrederic Weisbecker 2502db270a8SFrederic Weisbecker if (pdu_len) 2512db270a8SFrederic Weisbecker memcpy((void *) t + sizeof(*t), pdu_data, pdu_len); 2522db270a8SFrederic Weisbecker 25318cea459SLi Zefan if (blk_tracer) { 2542db270a8SFrederic Weisbecker trace_buffer_unlock_commit(blk_tr, event, 0, pc); 2552db270a8SFrederic Weisbecker return; 2562db270a8SFrederic Weisbecker } 2572db270a8SFrederic Weisbecker } 2582db270a8SFrederic Weisbecker 2592db270a8SFrederic Weisbecker local_irq_restore(flags); 2602db270a8SFrederic Weisbecker } 2612db270a8SFrederic Weisbecker 2622db270a8SFrederic Weisbecker static struct dentry *blk_tree_root; 2632db270a8SFrederic Weisbecker static DEFINE_MUTEX(blk_tree_mutex); 2642db270a8SFrederic Weisbecker 265ad5dd549SLi Zefan static void blk_trace_free(struct blk_trace *bt) 2662db270a8SFrederic Weisbecker { 2672db270a8SFrederic Weisbecker debugfs_remove(bt->msg_file); 2682db270a8SFrederic Weisbecker debugfs_remove(bt->dropped_file); 269fd51d251SStefan Raspl debugfs_remove(bt->dir); 2702db270a8SFrederic Weisbecker relay_close(bt->rchan); 2712db270a8SFrederic Weisbecker free_percpu(bt->sequence); 2722db270a8SFrederic Weisbecker free_percpu(bt->msg_data); 2732db270a8SFrederic Weisbecker kfree(bt); 274ad5dd549SLi Zefan } 275ad5dd549SLi Zefan 276ad5dd549SLi Zefan static void blk_trace_cleanup(struct blk_trace *bt) 277ad5dd549SLi Zefan { 278ad5dd549SLi Zefan blk_trace_free(bt); 2792db270a8SFrederic Weisbecker if (atomic_dec_and_test(&blk_probes_ref)) 2802db270a8SFrederic Weisbecker blk_unregister_tracepoints(); 2812db270a8SFrederic Weisbecker } 2822db270a8SFrederic Weisbecker 2832db270a8SFrederic Weisbecker int blk_trace_remove(struct request_queue *q) 2842db270a8SFrederic Weisbecker { 2852db270a8SFrederic Weisbecker struct blk_trace *bt; 2862db270a8SFrederic Weisbecker 2872db270a8SFrederic Weisbecker bt = xchg(&q->blk_trace, NULL); 2882db270a8SFrederic Weisbecker if (!bt) 2892db270a8SFrederic Weisbecker return -EINVAL; 2902db270a8SFrederic Weisbecker 29155547204SLi Zefan if (bt->trace_state != Blktrace_running) 2922db270a8SFrederic Weisbecker blk_trace_cleanup(bt); 2932db270a8SFrederic Weisbecker 2942db270a8SFrederic Weisbecker return 0; 2952db270a8SFrederic Weisbecker } 2962db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_remove); 2972db270a8SFrederic Weisbecker 2982db270a8SFrederic Weisbecker static int blk_dropped_open(struct inode *inode, struct file *filp) 2992db270a8SFrederic Weisbecker { 3002db270a8SFrederic Weisbecker filp->private_data = inode->i_private; 3012db270a8SFrederic Weisbecker 3022db270a8SFrederic Weisbecker return 0; 3032db270a8SFrederic Weisbecker } 3042db270a8SFrederic Weisbecker 3052db270a8SFrederic Weisbecker static ssize_t blk_dropped_read(struct file *filp, char __user *buffer, 3062db270a8SFrederic Weisbecker size_t count, loff_t *ppos) 3072db270a8SFrederic Weisbecker { 3082db270a8SFrederic Weisbecker struct blk_trace *bt = filp->private_data; 3092db270a8SFrederic Weisbecker char buf[16]; 3102db270a8SFrederic Weisbecker 3112db270a8SFrederic Weisbecker snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped)); 3122db270a8SFrederic Weisbecker 3132db270a8SFrederic Weisbecker return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 3142db270a8SFrederic Weisbecker } 3152db270a8SFrederic Weisbecker 3162db270a8SFrederic Weisbecker static const struct file_operations blk_dropped_fops = { 3172db270a8SFrederic Weisbecker .owner = THIS_MODULE, 3182db270a8SFrederic Weisbecker .open = blk_dropped_open, 3192db270a8SFrederic Weisbecker .read = blk_dropped_read, 3202db270a8SFrederic Weisbecker }; 3212db270a8SFrederic Weisbecker 3222db270a8SFrederic Weisbecker static int blk_msg_open(struct inode *inode, struct file *filp) 3232db270a8SFrederic Weisbecker { 3242db270a8SFrederic Weisbecker filp->private_data = inode->i_private; 3252db270a8SFrederic Weisbecker 3262db270a8SFrederic Weisbecker return 0; 3272db270a8SFrederic Weisbecker } 3282db270a8SFrederic Weisbecker 3292db270a8SFrederic Weisbecker static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, 3302db270a8SFrederic Weisbecker size_t count, loff_t *ppos) 3312db270a8SFrederic Weisbecker { 3322db270a8SFrederic Weisbecker char *msg; 3332db270a8SFrederic Weisbecker struct blk_trace *bt; 3342db270a8SFrederic Weisbecker 3357635b03aSLi Zefan if (count >= BLK_TN_MAX_MSG) 3362db270a8SFrederic Weisbecker return -EINVAL; 3372db270a8SFrederic Weisbecker 338a4b3ada8SCarl Henrik Lunde msg = kmalloc(count + 1, GFP_KERNEL); 3392db270a8SFrederic Weisbecker if (msg == NULL) 3402db270a8SFrederic Weisbecker return -ENOMEM; 3412db270a8SFrederic Weisbecker 3422db270a8SFrederic Weisbecker if (copy_from_user(msg, buffer, count)) { 3432db270a8SFrederic Weisbecker kfree(msg); 3442db270a8SFrederic Weisbecker return -EFAULT; 3452db270a8SFrederic Weisbecker } 3462db270a8SFrederic Weisbecker 347a4b3ada8SCarl Henrik Lunde msg[count] = '\0'; 3482db270a8SFrederic Weisbecker bt = filp->private_data; 3492db270a8SFrederic Weisbecker __trace_note_message(bt, "%s", msg); 3502db270a8SFrederic Weisbecker kfree(msg); 3512db270a8SFrederic Weisbecker 3522db270a8SFrederic Weisbecker return count; 3532db270a8SFrederic Weisbecker } 3542db270a8SFrederic Weisbecker 3552db270a8SFrederic Weisbecker static const struct file_operations blk_msg_fops = { 3562db270a8SFrederic Weisbecker .owner = THIS_MODULE, 3572db270a8SFrederic Weisbecker .open = blk_msg_open, 3582db270a8SFrederic Weisbecker .write = blk_msg_write, 3592db270a8SFrederic Weisbecker }; 3602db270a8SFrederic Weisbecker 3612db270a8SFrederic Weisbecker /* 3622db270a8SFrederic Weisbecker * Keep track of how many times we encountered a full subbuffer, to aid 3632db270a8SFrederic Weisbecker * the user space app in telling how many lost events there were. 3642db270a8SFrederic Weisbecker */ 3652db270a8SFrederic Weisbecker static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf, 3662db270a8SFrederic Weisbecker void *prev_subbuf, size_t prev_padding) 3672db270a8SFrederic Weisbecker { 3682db270a8SFrederic Weisbecker struct blk_trace *bt; 3692db270a8SFrederic Weisbecker 3702db270a8SFrederic Weisbecker if (!relay_buf_full(buf)) 3712db270a8SFrederic Weisbecker return 1; 3722db270a8SFrederic Weisbecker 3732db270a8SFrederic Weisbecker bt = buf->chan->private_data; 3742db270a8SFrederic Weisbecker atomic_inc(&bt->dropped); 3752db270a8SFrederic Weisbecker return 0; 3762db270a8SFrederic Weisbecker } 3772db270a8SFrederic Weisbecker 3782db270a8SFrederic Weisbecker static int blk_remove_buf_file_callback(struct dentry *dentry) 3792db270a8SFrederic Weisbecker { 3802db270a8SFrederic Weisbecker struct dentry *parent = dentry->d_parent; 3812db270a8SFrederic Weisbecker debugfs_remove(dentry); 3822db270a8SFrederic Weisbecker 3832db270a8SFrederic Weisbecker /* 3842db270a8SFrederic Weisbecker * this will fail for all but the last file, but that is ok. what we 3852db270a8SFrederic Weisbecker * care about is the top level buts->name directory going away, when 3862db270a8SFrederic Weisbecker * the last trace file is gone. Then we don't have to rmdir() that 3872db270a8SFrederic Weisbecker * manually on trace stop, so it nicely solves the issue with 3882db270a8SFrederic Weisbecker * force killing of running traces. 3892db270a8SFrederic Weisbecker */ 3902db270a8SFrederic Weisbecker 3912db270a8SFrederic Weisbecker debugfs_remove(parent); 3922db270a8SFrederic Weisbecker return 0; 3932db270a8SFrederic Weisbecker } 3942db270a8SFrederic Weisbecker 3952db270a8SFrederic Weisbecker static struct dentry *blk_create_buf_file_callback(const char *filename, 3962db270a8SFrederic Weisbecker struct dentry *parent, 3972db270a8SFrederic Weisbecker int mode, 3982db270a8SFrederic Weisbecker struct rchan_buf *buf, 3992db270a8SFrederic Weisbecker int *is_global) 4002db270a8SFrederic Weisbecker { 4012db270a8SFrederic Weisbecker return debugfs_create_file(filename, mode, parent, buf, 4022db270a8SFrederic Weisbecker &relay_file_operations); 4032db270a8SFrederic Weisbecker } 4042db270a8SFrederic Weisbecker 4052db270a8SFrederic Weisbecker static struct rchan_callbacks blk_relay_callbacks = { 4062db270a8SFrederic Weisbecker .subbuf_start = blk_subbuf_start_callback, 4072db270a8SFrederic Weisbecker .create_buf_file = blk_create_buf_file_callback, 4082db270a8SFrederic Weisbecker .remove_buf_file = blk_remove_buf_file_callback, 4092db270a8SFrederic Weisbecker }; 4102db270a8SFrederic Weisbecker 4119908c309SLi Zefan static void blk_trace_setup_lba(struct blk_trace *bt, 4129908c309SLi Zefan struct block_device *bdev) 4139908c309SLi Zefan { 4149908c309SLi Zefan struct hd_struct *part = NULL; 4159908c309SLi Zefan 4169908c309SLi Zefan if (bdev) 4179908c309SLi Zefan part = bdev->bd_part; 4189908c309SLi Zefan 4199908c309SLi Zefan if (part) { 4209908c309SLi Zefan bt->start_lba = part->start_sect; 4219908c309SLi Zefan bt->end_lba = part->start_sect + part->nr_sects; 4229908c309SLi Zefan } else { 4239908c309SLi Zefan bt->start_lba = 0; 4249908c309SLi Zefan bt->end_lba = -1ULL; 4259908c309SLi Zefan } 4269908c309SLi Zefan } 4279908c309SLi Zefan 4282db270a8SFrederic Weisbecker /* 4292db270a8SFrederic Weisbecker * Setup everything required to start tracing 4302db270a8SFrederic Weisbecker */ 4312db270a8SFrederic Weisbecker int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 432d0deef5bSShawn Du struct block_device *bdev, 4332db270a8SFrederic Weisbecker struct blk_user_trace_setup *buts) 4342db270a8SFrederic Weisbecker { 4352db270a8SFrederic Weisbecker struct blk_trace *old_bt, *bt = NULL; 4362db270a8SFrederic Weisbecker struct dentry *dir = NULL; 4372db270a8SFrederic Weisbecker int ret, i; 4382db270a8SFrederic Weisbecker 4392db270a8SFrederic Weisbecker if (!buts->buf_size || !buts->buf_nr) 4402db270a8SFrederic Weisbecker return -EINVAL; 4412db270a8SFrederic Weisbecker 4422db270a8SFrederic Weisbecker strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); 4432db270a8SFrederic Weisbecker buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; 4442db270a8SFrederic Weisbecker 4452db270a8SFrederic Weisbecker /* 4462db270a8SFrederic Weisbecker * some device names have larger paths - convert the slashes 4472db270a8SFrederic Weisbecker * to underscores for this to work as expected 4482db270a8SFrederic Weisbecker */ 4492db270a8SFrederic Weisbecker for (i = 0; i < strlen(buts->name); i++) 4502db270a8SFrederic Weisbecker if (buts->name[i] == '/') 4512db270a8SFrederic Weisbecker buts->name[i] = '_'; 4522db270a8SFrederic Weisbecker 4532db270a8SFrederic Weisbecker bt = kzalloc(sizeof(*bt), GFP_KERNEL); 4542db270a8SFrederic Weisbecker if (!bt) 455ad5dd549SLi Zefan return -ENOMEM; 4562db270a8SFrederic Weisbecker 457ad5dd549SLi Zefan ret = -ENOMEM; 4582db270a8SFrederic Weisbecker bt->sequence = alloc_percpu(unsigned long); 4592db270a8SFrederic Weisbecker if (!bt->sequence) 4602db270a8SFrederic Weisbecker goto err; 4612db270a8SFrederic Weisbecker 462f0ef0398SIngo Molnar bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 4632db270a8SFrederic Weisbecker if (!bt->msg_data) 4642db270a8SFrederic Weisbecker goto err; 4652db270a8SFrederic Weisbecker 4662db270a8SFrederic Weisbecker ret = -ENOENT; 4672db270a8SFrederic Weisbecker 468b5230b56SLi Zefan mutex_lock(&blk_tree_mutex); 4692db270a8SFrederic Weisbecker if (!blk_tree_root) { 4702db270a8SFrederic Weisbecker blk_tree_root = debugfs_create_dir("block", NULL); 471b5230b56SLi Zefan if (!blk_tree_root) { 472b5230b56SLi Zefan mutex_unlock(&blk_tree_mutex); 4731a17662eSLi Zefan goto err; 4742db270a8SFrederic Weisbecker } 475b5230b56SLi Zefan } 476b5230b56SLi Zefan mutex_unlock(&blk_tree_mutex); 4772db270a8SFrederic Weisbecker 4782db270a8SFrederic Weisbecker dir = debugfs_create_dir(buts->name, blk_tree_root); 4792db270a8SFrederic Weisbecker 4802db270a8SFrederic Weisbecker if (!dir) 4812db270a8SFrederic Weisbecker goto err; 4822db270a8SFrederic Weisbecker 4832db270a8SFrederic Weisbecker bt->dir = dir; 4842db270a8SFrederic Weisbecker bt->dev = dev; 4852db270a8SFrederic Weisbecker atomic_set(&bt->dropped, 0); 4862db270a8SFrederic Weisbecker 4872db270a8SFrederic Weisbecker ret = -EIO; 4882db270a8SFrederic Weisbecker bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, 4892db270a8SFrederic Weisbecker &blk_dropped_fops); 4902db270a8SFrederic Weisbecker if (!bt->dropped_file) 4912db270a8SFrederic Weisbecker goto err; 4922db270a8SFrederic Weisbecker 4932db270a8SFrederic Weisbecker bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); 4942db270a8SFrederic Weisbecker if (!bt->msg_file) 4952db270a8SFrederic Weisbecker goto err; 4962db270a8SFrederic Weisbecker 4972db270a8SFrederic Weisbecker bt->rchan = relay_open("trace", dir, buts->buf_size, 4982db270a8SFrederic Weisbecker buts->buf_nr, &blk_relay_callbacks, bt); 4992db270a8SFrederic Weisbecker if (!bt->rchan) 5002db270a8SFrederic Weisbecker goto err; 5012db270a8SFrederic Weisbecker 5022db270a8SFrederic Weisbecker bt->act_mask = buts->act_mask; 5032db270a8SFrederic Weisbecker if (!bt->act_mask) 5042db270a8SFrederic Weisbecker bt->act_mask = (u16) -1; 5052db270a8SFrederic Weisbecker 5069908c309SLi Zefan blk_trace_setup_lba(bt, bdev); 5072db270a8SFrederic Weisbecker 508d0deef5bSShawn Du /* overwrite with user settings */ 509d0deef5bSShawn Du if (buts->start_lba) 510d0deef5bSShawn Du bt->start_lba = buts->start_lba; 511d0deef5bSShawn Du if (buts->end_lba) 512d0deef5bSShawn Du bt->end_lba = buts->end_lba; 513d0deef5bSShawn Du 5142db270a8SFrederic Weisbecker bt->pid = buts->pid; 5152db270a8SFrederic Weisbecker bt->trace_state = Blktrace_setup; 5162db270a8SFrederic Weisbecker 5172db270a8SFrederic Weisbecker ret = -EBUSY; 5182db270a8SFrederic Weisbecker old_bt = xchg(&q->blk_trace, bt); 5192db270a8SFrederic Weisbecker if (old_bt) { 5202db270a8SFrederic Weisbecker (void) xchg(&q->blk_trace, old_bt); 5212db270a8SFrederic Weisbecker goto err; 5222db270a8SFrederic Weisbecker } 5232db270a8SFrederic Weisbecker 52417ba97e3SLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 525cbe28296SLi Zefan blk_register_tracepoints(); 526cbe28296SLi Zefan 5272db270a8SFrederic Weisbecker return 0; 5282db270a8SFrederic Weisbecker err: 529ad5dd549SLi Zefan blk_trace_free(bt); 5302db270a8SFrederic Weisbecker return ret; 5312db270a8SFrederic Weisbecker } 5322db270a8SFrederic Weisbecker 5332db270a8SFrederic Weisbecker int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 534d0deef5bSShawn Du struct block_device *bdev, 5352db270a8SFrederic Weisbecker char __user *arg) 5362db270a8SFrederic Weisbecker { 5372db270a8SFrederic Weisbecker struct blk_user_trace_setup buts; 5382db270a8SFrederic Weisbecker int ret; 5392db270a8SFrederic Weisbecker 5402db270a8SFrederic Weisbecker ret = copy_from_user(&buts, arg, sizeof(buts)); 5412db270a8SFrederic Weisbecker if (ret) 5422db270a8SFrederic Weisbecker return -EFAULT; 5432db270a8SFrederic Weisbecker 544d0deef5bSShawn Du ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 5452db270a8SFrederic Weisbecker if (ret) 5462db270a8SFrederic Weisbecker return ret; 5472db270a8SFrederic Weisbecker 5482db270a8SFrederic Weisbecker if (copy_to_user(arg, &buts, sizeof(buts))) 5492db270a8SFrederic Weisbecker return -EFAULT; 5502db270a8SFrederic Weisbecker 5512db270a8SFrederic Weisbecker return 0; 5522db270a8SFrederic Weisbecker } 5532db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_setup); 5542db270a8SFrederic Weisbecker 5552db270a8SFrederic Weisbecker int blk_trace_startstop(struct request_queue *q, int start) 5562db270a8SFrederic Weisbecker { 5572db270a8SFrederic Weisbecker int ret; 5582db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 5592db270a8SFrederic Weisbecker 5602db270a8SFrederic Weisbecker if (bt == NULL) 5612db270a8SFrederic Weisbecker return -EINVAL; 5622db270a8SFrederic Weisbecker 5632db270a8SFrederic Weisbecker /* 5642db270a8SFrederic Weisbecker * For starting a trace, we can transition from a setup or stopped 5652db270a8SFrederic Weisbecker * trace. For stopping a trace, the state must be running 5662db270a8SFrederic Weisbecker */ 5672db270a8SFrederic Weisbecker ret = -EINVAL; 5682db270a8SFrederic Weisbecker if (start) { 5692db270a8SFrederic Weisbecker if (bt->trace_state == Blktrace_setup || 5702db270a8SFrederic Weisbecker bt->trace_state == Blktrace_stopped) { 5712db270a8SFrederic Weisbecker blktrace_seq++; 5722db270a8SFrederic Weisbecker smp_mb(); 5732db270a8SFrederic Weisbecker bt->trace_state = Blktrace_running; 5742db270a8SFrederic Weisbecker 5752db270a8SFrederic Weisbecker trace_note_time(bt); 5762db270a8SFrederic Weisbecker ret = 0; 5772db270a8SFrederic Weisbecker } 5782db270a8SFrederic Weisbecker } else { 5792db270a8SFrederic Weisbecker if (bt->trace_state == Blktrace_running) { 5802db270a8SFrederic Weisbecker bt->trace_state = Blktrace_stopped; 5812db270a8SFrederic Weisbecker relay_flush(bt->rchan); 5822db270a8SFrederic Weisbecker ret = 0; 5832db270a8SFrederic Weisbecker } 5842db270a8SFrederic Weisbecker } 5852db270a8SFrederic Weisbecker 5862db270a8SFrederic Weisbecker return ret; 5872db270a8SFrederic Weisbecker } 5882db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_trace_startstop); 5892db270a8SFrederic Weisbecker 5902db270a8SFrederic Weisbecker /** 5912db270a8SFrederic Weisbecker * blk_trace_ioctl: - handle the ioctls associated with tracing 5922db270a8SFrederic Weisbecker * @bdev: the block device 5932db270a8SFrederic Weisbecker * @cmd: the ioctl cmd 5942db270a8SFrederic Weisbecker * @arg: the argument data, if any 5952db270a8SFrederic Weisbecker * 5962db270a8SFrederic Weisbecker **/ 5972db270a8SFrederic Weisbecker int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) 5982db270a8SFrederic Weisbecker { 5992db270a8SFrederic Weisbecker struct request_queue *q; 6002db270a8SFrederic Weisbecker int ret, start = 0; 6012db270a8SFrederic Weisbecker char b[BDEVNAME_SIZE]; 6022db270a8SFrederic Weisbecker 6032db270a8SFrederic Weisbecker q = bdev_get_queue(bdev); 6042db270a8SFrederic Weisbecker if (!q) 6052db270a8SFrederic Weisbecker return -ENXIO; 6062db270a8SFrederic Weisbecker 6072db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 6082db270a8SFrederic Weisbecker 6092db270a8SFrederic Weisbecker switch (cmd) { 6102db270a8SFrederic Weisbecker case BLKTRACESETUP: 6112db270a8SFrederic Weisbecker bdevname(bdev, b); 612d0deef5bSShawn Du ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 6132db270a8SFrederic Weisbecker break; 6142db270a8SFrederic Weisbecker case BLKTRACESTART: 6152db270a8SFrederic Weisbecker start = 1; 6162db270a8SFrederic Weisbecker case BLKTRACESTOP: 6172db270a8SFrederic Weisbecker ret = blk_trace_startstop(q, start); 6182db270a8SFrederic Weisbecker break; 6192db270a8SFrederic Weisbecker case BLKTRACETEARDOWN: 6202db270a8SFrederic Weisbecker ret = blk_trace_remove(q); 6212db270a8SFrederic Weisbecker break; 6222db270a8SFrederic Weisbecker default: 6232db270a8SFrederic Weisbecker ret = -ENOTTY; 6242db270a8SFrederic Weisbecker break; 6252db270a8SFrederic Weisbecker } 6262db270a8SFrederic Weisbecker 6272db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 6282db270a8SFrederic Weisbecker return ret; 6292db270a8SFrederic Weisbecker } 6302db270a8SFrederic Weisbecker 6312db270a8SFrederic Weisbecker /** 6322db270a8SFrederic Weisbecker * blk_trace_shutdown: - stop and cleanup trace structures 6332db270a8SFrederic Weisbecker * @q: the request queue associated with the device 6342db270a8SFrederic Weisbecker * 6352db270a8SFrederic Weisbecker **/ 6362db270a8SFrederic Weisbecker void blk_trace_shutdown(struct request_queue *q) 6372db270a8SFrederic Weisbecker { 6382db270a8SFrederic Weisbecker if (q->blk_trace) { 6392db270a8SFrederic Weisbecker blk_trace_startstop(q, 0); 6402db270a8SFrederic Weisbecker blk_trace_remove(q); 6412db270a8SFrederic Weisbecker } 6422db270a8SFrederic Weisbecker } 6432db270a8SFrederic Weisbecker 6442db270a8SFrederic Weisbecker /* 6452db270a8SFrederic Weisbecker * blktrace probes 6462db270a8SFrederic Weisbecker */ 6472db270a8SFrederic Weisbecker 6482db270a8SFrederic Weisbecker /** 6492db270a8SFrederic Weisbecker * blk_add_trace_rq - Add a trace for a request oriented action 6502db270a8SFrederic Weisbecker * @q: queue the io is for 6512db270a8SFrederic Weisbecker * @rq: the source request 6522db270a8SFrederic Weisbecker * @what: the action 6532db270a8SFrederic Weisbecker * 6542db270a8SFrederic Weisbecker * Description: 6552db270a8SFrederic Weisbecker * Records an action against a request. Will log the bio offset + size. 6562db270a8SFrederic Weisbecker * 6572db270a8SFrederic Weisbecker **/ 6582db270a8SFrederic Weisbecker static void blk_add_trace_rq(struct request_queue *q, struct request *rq, 6592db270a8SFrederic Weisbecker u32 what) 6602db270a8SFrederic Weisbecker { 6612db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 6622db270a8SFrederic Weisbecker int rw = rq->cmd_flags & 0x03; 6632db270a8SFrederic Weisbecker 6642db270a8SFrederic Weisbecker if (likely(!bt)) 6652db270a8SFrederic Weisbecker return; 6662db270a8SFrederic Weisbecker 6672db270a8SFrederic Weisbecker if (blk_discard_rq(rq)) 6682db270a8SFrederic Weisbecker rw |= (1 << BIO_RW_DISCARD); 6692db270a8SFrederic Weisbecker 6702db270a8SFrederic Weisbecker if (blk_pc_request(rq)) { 6712db270a8SFrederic Weisbecker what |= BLK_TC_ACT(BLK_TC_PC); 6722e46e8b2STejun Heo __blk_add_trace(bt, 0, blk_rq_bytes(rq), rw, 6732e46e8b2STejun Heo what, rq->errors, rq->cmd_len, rq->cmd); 6742db270a8SFrederic Weisbecker } else { 6752db270a8SFrederic Weisbecker what |= BLK_TC_ACT(BLK_TC_FS); 6762e46e8b2STejun Heo __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), rw, 6772e46e8b2STejun Heo what, rq->errors, 0, NULL); 6782db270a8SFrederic Weisbecker } 6792db270a8SFrederic Weisbecker } 6802db270a8SFrederic Weisbecker 6812db270a8SFrederic Weisbecker static void blk_add_trace_rq_abort(struct request_queue *q, struct request *rq) 6822db270a8SFrederic Weisbecker { 6832db270a8SFrederic Weisbecker blk_add_trace_rq(q, rq, BLK_TA_ABORT); 6842db270a8SFrederic Weisbecker } 6852db270a8SFrederic Weisbecker 6862db270a8SFrederic Weisbecker static void blk_add_trace_rq_insert(struct request_queue *q, struct request *rq) 6872db270a8SFrederic Weisbecker { 6882db270a8SFrederic Weisbecker blk_add_trace_rq(q, rq, BLK_TA_INSERT); 6892db270a8SFrederic Weisbecker } 6902db270a8SFrederic Weisbecker 6912db270a8SFrederic Weisbecker static void blk_add_trace_rq_issue(struct request_queue *q, struct request *rq) 6922db270a8SFrederic Weisbecker { 6932db270a8SFrederic Weisbecker blk_add_trace_rq(q, rq, BLK_TA_ISSUE); 6942db270a8SFrederic Weisbecker } 6952db270a8SFrederic Weisbecker 6962db270a8SFrederic Weisbecker static void blk_add_trace_rq_requeue(struct request_queue *q, 6972db270a8SFrederic Weisbecker struct request *rq) 6982db270a8SFrederic Weisbecker { 6992db270a8SFrederic Weisbecker blk_add_trace_rq(q, rq, BLK_TA_REQUEUE); 7002db270a8SFrederic Weisbecker } 7012db270a8SFrederic Weisbecker 7022db270a8SFrederic Weisbecker static void blk_add_trace_rq_complete(struct request_queue *q, 7032db270a8SFrederic Weisbecker struct request *rq) 7042db270a8SFrederic Weisbecker { 7052db270a8SFrederic Weisbecker blk_add_trace_rq(q, rq, BLK_TA_COMPLETE); 7062db270a8SFrederic Weisbecker } 7072db270a8SFrederic Weisbecker 7082db270a8SFrederic Weisbecker /** 7092db270a8SFrederic Weisbecker * blk_add_trace_bio - Add a trace for a bio oriented action 7102db270a8SFrederic Weisbecker * @q: queue the io is for 7112db270a8SFrederic Weisbecker * @bio: the source bio 7122db270a8SFrederic Weisbecker * @what: the action 7132db270a8SFrederic Weisbecker * 7142db270a8SFrederic Weisbecker * Description: 7152db270a8SFrederic Weisbecker * Records an action against a bio. Will log the bio offset + size. 7162db270a8SFrederic Weisbecker * 7172db270a8SFrederic Weisbecker **/ 7182db270a8SFrederic Weisbecker static void blk_add_trace_bio(struct request_queue *q, struct bio *bio, 7192db270a8SFrederic Weisbecker u32 what) 7202db270a8SFrederic Weisbecker { 7212db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7222db270a8SFrederic Weisbecker 7232db270a8SFrederic Weisbecker if (likely(!bt)) 7242db270a8SFrederic Weisbecker return; 7252db270a8SFrederic Weisbecker 7262db270a8SFrederic Weisbecker __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, 7272db270a8SFrederic Weisbecker !bio_flagged(bio, BIO_UPTODATE), 0, NULL); 7282db270a8SFrederic Weisbecker } 7292db270a8SFrederic Weisbecker 7302db270a8SFrederic Weisbecker static void blk_add_trace_bio_bounce(struct request_queue *q, struct bio *bio) 7312db270a8SFrederic Weisbecker { 7322db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_BOUNCE); 7332db270a8SFrederic Weisbecker } 7342db270a8SFrederic Weisbecker 7352db270a8SFrederic Weisbecker static void blk_add_trace_bio_complete(struct request_queue *q, struct bio *bio) 7362db270a8SFrederic Weisbecker { 7372db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_COMPLETE); 7382db270a8SFrederic Weisbecker } 7392db270a8SFrederic Weisbecker 7402db270a8SFrederic Weisbecker static void blk_add_trace_bio_backmerge(struct request_queue *q, 7412db270a8SFrederic Weisbecker struct bio *bio) 7422db270a8SFrederic Weisbecker { 7432db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE); 7442db270a8SFrederic Weisbecker } 7452db270a8SFrederic Weisbecker 7462db270a8SFrederic Weisbecker static void blk_add_trace_bio_frontmerge(struct request_queue *q, 7472db270a8SFrederic Weisbecker struct bio *bio) 7482db270a8SFrederic Weisbecker { 7492db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE); 7502db270a8SFrederic Weisbecker } 7512db270a8SFrederic Weisbecker 7522db270a8SFrederic Weisbecker static void blk_add_trace_bio_queue(struct request_queue *q, struct bio *bio) 7532db270a8SFrederic Weisbecker { 7542db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_QUEUE); 7552db270a8SFrederic Weisbecker } 7562db270a8SFrederic Weisbecker 7572db270a8SFrederic Weisbecker static void blk_add_trace_getrq(struct request_queue *q, 7582db270a8SFrederic Weisbecker struct bio *bio, int rw) 7592db270a8SFrederic Weisbecker { 7602db270a8SFrederic Weisbecker if (bio) 7612db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_GETRQ); 7622db270a8SFrederic Weisbecker else { 7632db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7642db270a8SFrederic Weisbecker 7652db270a8SFrederic Weisbecker if (bt) 7662db270a8SFrederic Weisbecker __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL); 7672db270a8SFrederic Weisbecker } 7682db270a8SFrederic Weisbecker } 7692db270a8SFrederic Weisbecker 7702db270a8SFrederic Weisbecker 7712db270a8SFrederic Weisbecker static void blk_add_trace_sleeprq(struct request_queue *q, 7722db270a8SFrederic Weisbecker struct bio *bio, int rw) 7732db270a8SFrederic Weisbecker { 7742db270a8SFrederic Weisbecker if (bio) 7752db270a8SFrederic Weisbecker blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ); 7762db270a8SFrederic Weisbecker else { 7772db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7782db270a8SFrederic Weisbecker 7792db270a8SFrederic Weisbecker if (bt) 7802db270a8SFrederic Weisbecker __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ, 7812db270a8SFrederic Weisbecker 0, 0, NULL); 7822db270a8SFrederic Weisbecker } 7832db270a8SFrederic Weisbecker } 7842db270a8SFrederic Weisbecker 7852db270a8SFrederic Weisbecker static void blk_add_trace_plug(struct request_queue *q) 7862db270a8SFrederic Weisbecker { 7872db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7882db270a8SFrederic Weisbecker 7892db270a8SFrederic Weisbecker if (bt) 7902db270a8SFrederic Weisbecker __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL); 7912db270a8SFrederic Weisbecker } 7922db270a8SFrederic Weisbecker 7932db270a8SFrederic Weisbecker static void blk_add_trace_unplug_io(struct request_queue *q) 7942db270a8SFrederic Weisbecker { 7952db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 7962db270a8SFrederic Weisbecker 7972db270a8SFrederic Weisbecker if (bt) { 7982db270a8SFrederic Weisbecker unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 7992db270a8SFrederic Weisbecker __be64 rpdu = cpu_to_be64(pdu); 8002db270a8SFrederic Weisbecker 8012db270a8SFrederic Weisbecker __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_IO, 0, 8022db270a8SFrederic Weisbecker sizeof(rpdu), &rpdu); 8032db270a8SFrederic Weisbecker } 8042db270a8SFrederic Weisbecker } 8052db270a8SFrederic Weisbecker 8062db270a8SFrederic Weisbecker static void blk_add_trace_unplug_timer(struct request_queue *q) 8072db270a8SFrederic Weisbecker { 8082db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8092db270a8SFrederic Weisbecker 8102db270a8SFrederic Weisbecker if (bt) { 8112db270a8SFrederic Weisbecker unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE]; 8122db270a8SFrederic Weisbecker __be64 rpdu = cpu_to_be64(pdu); 8132db270a8SFrederic Weisbecker 8142db270a8SFrederic Weisbecker __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_TIMER, 0, 8152db270a8SFrederic Weisbecker sizeof(rpdu), &rpdu); 8162db270a8SFrederic Weisbecker } 8172db270a8SFrederic Weisbecker } 8182db270a8SFrederic Weisbecker 8192db270a8SFrederic Weisbecker static void blk_add_trace_split(struct request_queue *q, struct bio *bio, 8202db270a8SFrederic Weisbecker unsigned int pdu) 8212db270a8SFrederic Weisbecker { 8222db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8232db270a8SFrederic Weisbecker 8242db270a8SFrederic Weisbecker if (bt) { 8252db270a8SFrederic Weisbecker __be64 rpdu = cpu_to_be64(pdu); 8262db270a8SFrederic Weisbecker 8272db270a8SFrederic Weisbecker __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 8282db270a8SFrederic Weisbecker BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE), 8292db270a8SFrederic Weisbecker sizeof(rpdu), &rpdu); 8302db270a8SFrederic Weisbecker } 8312db270a8SFrederic Weisbecker } 8322db270a8SFrederic Weisbecker 8332db270a8SFrederic Weisbecker /** 8342db270a8SFrederic Weisbecker * blk_add_trace_remap - Add a trace for a remap operation 8352db270a8SFrederic Weisbecker * @q: queue the io is for 8362db270a8SFrederic Weisbecker * @bio: the source bio 8372db270a8SFrederic Weisbecker * @dev: target device 838a42aaa3bSAlan D. Brunelle * @from: source sector 8392db270a8SFrederic Weisbecker * 8402db270a8SFrederic Weisbecker * Description: 8412db270a8SFrederic Weisbecker * Device mapper or raid target sometimes need to split a bio because 8422db270a8SFrederic Weisbecker * it spans a stripe (or similar). Add a trace for that action. 8432db270a8SFrederic Weisbecker * 8442db270a8SFrederic Weisbecker **/ 8452db270a8SFrederic Weisbecker static void blk_add_trace_remap(struct request_queue *q, struct bio *bio, 84622a7c31aSAlan D. Brunelle dev_t dev, sector_t from) 8472db270a8SFrederic Weisbecker { 8482db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8492db270a8SFrederic Weisbecker struct blk_io_trace_remap r; 8502db270a8SFrederic Weisbecker 8512db270a8SFrederic Weisbecker if (likely(!bt)) 8522db270a8SFrederic Weisbecker return; 8532db270a8SFrederic Weisbecker 854a42aaa3bSAlan D. Brunelle r.device_from = cpu_to_be32(dev); 855a42aaa3bSAlan D. Brunelle r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev); 856a42aaa3bSAlan D. Brunelle r.sector_from = cpu_to_be64(from); 8572db270a8SFrederic Weisbecker 85822a7c31aSAlan D. Brunelle __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, 85922a7c31aSAlan D. Brunelle BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), 86022a7c31aSAlan D. Brunelle sizeof(r), &r); 8612db270a8SFrederic Weisbecker } 8622db270a8SFrederic Weisbecker 8632db270a8SFrederic Weisbecker /** 8642db270a8SFrederic Weisbecker * blk_add_driver_data - Add binary message with driver-specific data 8652db270a8SFrederic Weisbecker * @q: queue the io is for 8662db270a8SFrederic Weisbecker * @rq: io request 8672db270a8SFrederic Weisbecker * @data: driver-specific data 8682db270a8SFrederic Weisbecker * @len: length of driver-specific data 8692db270a8SFrederic Weisbecker * 8702db270a8SFrederic Weisbecker * Description: 8712db270a8SFrederic Weisbecker * Some drivers might want to write driver-specific data per request. 8722db270a8SFrederic Weisbecker * 8732db270a8SFrederic Weisbecker **/ 8742db270a8SFrederic Weisbecker void blk_add_driver_data(struct request_queue *q, 8752db270a8SFrederic Weisbecker struct request *rq, 8762db270a8SFrederic Weisbecker void *data, size_t len) 8772db270a8SFrederic Weisbecker { 8782db270a8SFrederic Weisbecker struct blk_trace *bt = q->blk_trace; 8792db270a8SFrederic Weisbecker 8802db270a8SFrederic Weisbecker if (likely(!bt)) 8812db270a8SFrederic Weisbecker return; 8822db270a8SFrederic Weisbecker 8832db270a8SFrederic Weisbecker if (blk_pc_request(rq)) 8842e46e8b2STejun Heo __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 8852e46e8b2STejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 8862db270a8SFrederic Weisbecker else 8872e46e8b2STejun Heo __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 8882e46e8b2STejun Heo BLK_TA_DRV_DATA, rq->errors, len, data); 8892db270a8SFrederic Weisbecker } 8902db270a8SFrederic Weisbecker EXPORT_SYMBOL_GPL(blk_add_driver_data); 8912db270a8SFrederic Weisbecker 8923c289ba7SLi Zefan static void blk_register_tracepoints(void) 8932db270a8SFrederic Weisbecker { 8942db270a8SFrederic Weisbecker int ret; 8952db270a8SFrederic Weisbecker 8962db270a8SFrederic Weisbecker ret = register_trace_block_rq_abort(blk_add_trace_rq_abort); 8972db270a8SFrederic Weisbecker WARN_ON(ret); 8982db270a8SFrederic Weisbecker ret = register_trace_block_rq_insert(blk_add_trace_rq_insert); 8992db270a8SFrederic Weisbecker WARN_ON(ret); 9002db270a8SFrederic Weisbecker ret = register_trace_block_rq_issue(blk_add_trace_rq_issue); 9012db270a8SFrederic Weisbecker WARN_ON(ret); 9022db270a8SFrederic Weisbecker ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue); 9032db270a8SFrederic Weisbecker WARN_ON(ret); 9042db270a8SFrederic Weisbecker ret = register_trace_block_rq_complete(blk_add_trace_rq_complete); 9052db270a8SFrederic Weisbecker WARN_ON(ret); 9062db270a8SFrederic Weisbecker ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce); 9072db270a8SFrederic Weisbecker WARN_ON(ret); 9082db270a8SFrederic Weisbecker ret = register_trace_block_bio_complete(blk_add_trace_bio_complete); 9092db270a8SFrederic Weisbecker WARN_ON(ret); 9102db270a8SFrederic Weisbecker ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge); 9112db270a8SFrederic Weisbecker WARN_ON(ret); 9122db270a8SFrederic Weisbecker ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge); 9132db270a8SFrederic Weisbecker WARN_ON(ret); 9142db270a8SFrederic Weisbecker ret = register_trace_block_bio_queue(blk_add_trace_bio_queue); 9152db270a8SFrederic Weisbecker WARN_ON(ret); 9162db270a8SFrederic Weisbecker ret = register_trace_block_getrq(blk_add_trace_getrq); 9172db270a8SFrederic Weisbecker WARN_ON(ret); 9182db270a8SFrederic Weisbecker ret = register_trace_block_sleeprq(blk_add_trace_sleeprq); 9192db270a8SFrederic Weisbecker WARN_ON(ret); 9202db270a8SFrederic Weisbecker ret = register_trace_block_plug(blk_add_trace_plug); 9212db270a8SFrederic Weisbecker WARN_ON(ret); 9222db270a8SFrederic Weisbecker ret = register_trace_block_unplug_timer(blk_add_trace_unplug_timer); 9232db270a8SFrederic Weisbecker WARN_ON(ret); 9242db270a8SFrederic Weisbecker ret = register_trace_block_unplug_io(blk_add_trace_unplug_io); 9252db270a8SFrederic Weisbecker WARN_ON(ret); 9262db270a8SFrederic Weisbecker ret = register_trace_block_split(blk_add_trace_split); 9272db270a8SFrederic Weisbecker WARN_ON(ret); 9282db270a8SFrederic Weisbecker ret = register_trace_block_remap(blk_add_trace_remap); 9292db270a8SFrederic Weisbecker WARN_ON(ret); 9302db270a8SFrederic Weisbecker } 9312db270a8SFrederic Weisbecker 9322db270a8SFrederic Weisbecker static void blk_unregister_tracepoints(void) 9332db270a8SFrederic Weisbecker { 9342db270a8SFrederic Weisbecker unregister_trace_block_remap(blk_add_trace_remap); 9352db270a8SFrederic Weisbecker unregister_trace_block_split(blk_add_trace_split); 9362db270a8SFrederic Weisbecker unregister_trace_block_unplug_io(blk_add_trace_unplug_io); 9372db270a8SFrederic Weisbecker unregister_trace_block_unplug_timer(blk_add_trace_unplug_timer); 9382db270a8SFrederic Weisbecker unregister_trace_block_plug(blk_add_trace_plug); 9392db270a8SFrederic Weisbecker unregister_trace_block_sleeprq(blk_add_trace_sleeprq); 9402db270a8SFrederic Weisbecker unregister_trace_block_getrq(blk_add_trace_getrq); 9412db270a8SFrederic Weisbecker unregister_trace_block_bio_queue(blk_add_trace_bio_queue); 9422db270a8SFrederic Weisbecker unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge); 9432db270a8SFrederic Weisbecker unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge); 9442db270a8SFrederic Weisbecker unregister_trace_block_bio_complete(blk_add_trace_bio_complete); 9452db270a8SFrederic Weisbecker unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce); 9462db270a8SFrederic Weisbecker unregister_trace_block_rq_complete(blk_add_trace_rq_complete); 9472db270a8SFrederic Weisbecker unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue); 9482db270a8SFrederic Weisbecker unregister_trace_block_rq_issue(blk_add_trace_rq_issue); 9492db270a8SFrederic Weisbecker unregister_trace_block_rq_insert(blk_add_trace_rq_insert); 9502db270a8SFrederic Weisbecker unregister_trace_block_rq_abort(blk_add_trace_rq_abort); 9512db270a8SFrederic Weisbecker 9522db270a8SFrederic Weisbecker tracepoint_synchronize_unregister(); 9532db270a8SFrederic Weisbecker } 9542db270a8SFrederic Weisbecker 9552db270a8SFrederic Weisbecker /* 9562db270a8SFrederic Weisbecker * struct blk_io_tracer formatting routines 9572db270a8SFrederic Weisbecker */ 9582db270a8SFrederic Weisbecker 9592db270a8SFrederic Weisbecker static void fill_rwbs(char *rwbs, const struct blk_io_trace *t) 9602db270a8SFrederic Weisbecker { 9612db270a8SFrederic Weisbecker int i = 0; 96265796348SLi Zefan int tc = t->action >> BLK_TC_SHIFT; 9632db270a8SFrederic Weisbecker 96418cea459SLi Zefan if (t->action == BLK_TN_MESSAGE) { 96518cea459SLi Zefan rwbs[i++] = 'N'; 96618cea459SLi Zefan goto out; 96718cea459SLi Zefan } 96818cea459SLi Zefan 96965796348SLi Zefan if (tc & BLK_TC_DISCARD) 9702db270a8SFrederic Weisbecker rwbs[i++] = 'D'; 97165796348SLi Zefan else if (tc & BLK_TC_WRITE) 9722db270a8SFrederic Weisbecker rwbs[i++] = 'W'; 9732db270a8SFrederic Weisbecker else if (t->bytes) 9742db270a8SFrederic Weisbecker rwbs[i++] = 'R'; 9752db270a8SFrederic Weisbecker else 9762db270a8SFrederic Weisbecker rwbs[i++] = 'N'; 9772db270a8SFrederic Weisbecker 97865796348SLi Zefan if (tc & BLK_TC_AHEAD) 9792db270a8SFrederic Weisbecker rwbs[i++] = 'A'; 98065796348SLi Zefan if (tc & BLK_TC_BARRIER) 9812db270a8SFrederic Weisbecker rwbs[i++] = 'B'; 98265796348SLi Zefan if (tc & BLK_TC_SYNC) 9832db270a8SFrederic Weisbecker rwbs[i++] = 'S'; 98465796348SLi Zefan if (tc & BLK_TC_META) 9852db270a8SFrederic Weisbecker rwbs[i++] = 'M'; 98618cea459SLi Zefan out: 9872db270a8SFrederic Weisbecker rwbs[i] = '\0'; 9882db270a8SFrederic Weisbecker } 9892db270a8SFrederic Weisbecker 9902db270a8SFrederic Weisbecker static inline 9912db270a8SFrederic Weisbecker const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent) 9922db270a8SFrederic Weisbecker { 9932db270a8SFrederic Weisbecker return (const struct blk_io_trace *)ent; 9942db270a8SFrederic Weisbecker } 9952db270a8SFrederic Weisbecker 9962db270a8SFrederic Weisbecker static inline const void *pdu_start(const struct trace_entry *ent) 9972db270a8SFrederic Weisbecker { 9982db270a8SFrederic Weisbecker return te_blk_io_trace(ent) + 1; 9992db270a8SFrederic Weisbecker } 10002db270a8SFrederic Weisbecker 100166de7792SLi Zefan static inline u32 t_action(const struct trace_entry *ent) 100266de7792SLi Zefan { 100366de7792SLi Zefan return te_blk_io_trace(ent)->action; 100466de7792SLi Zefan } 100566de7792SLi Zefan 100666de7792SLi Zefan static inline u32 t_bytes(const struct trace_entry *ent) 100766de7792SLi Zefan { 100866de7792SLi Zefan return te_blk_io_trace(ent)->bytes; 100966de7792SLi Zefan } 101066de7792SLi Zefan 10112db270a8SFrederic Weisbecker static inline u32 t_sec(const struct trace_entry *ent) 10122db270a8SFrederic Weisbecker { 10132db270a8SFrederic Weisbecker return te_blk_io_trace(ent)->bytes >> 9; 10142db270a8SFrederic Weisbecker } 10152db270a8SFrederic Weisbecker 10162db270a8SFrederic Weisbecker static inline unsigned long long t_sector(const struct trace_entry *ent) 10172db270a8SFrederic Weisbecker { 10182db270a8SFrederic Weisbecker return te_blk_io_trace(ent)->sector; 10192db270a8SFrederic Weisbecker } 10202db270a8SFrederic Weisbecker 10212db270a8SFrederic Weisbecker static inline __u16 t_error(const struct trace_entry *ent) 10222db270a8SFrederic Weisbecker { 1023e0dc81beSLi Zefan return te_blk_io_trace(ent)->error; 10242db270a8SFrederic Weisbecker } 10252db270a8SFrederic Weisbecker 10262db270a8SFrederic Weisbecker static __u64 get_pdu_int(const struct trace_entry *ent) 10272db270a8SFrederic Weisbecker { 10282db270a8SFrederic Weisbecker const __u64 *val = pdu_start(ent); 10292db270a8SFrederic Weisbecker return be64_to_cpu(*val); 10302db270a8SFrederic Weisbecker } 10312db270a8SFrederic Weisbecker 10322db270a8SFrederic Weisbecker static void get_pdu_remap(const struct trace_entry *ent, 10332db270a8SFrederic Weisbecker struct blk_io_trace_remap *r) 10342db270a8SFrederic Weisbecker { 10352db270a8SFrederic Weisbecker const struct blk_io_trace_remap *__r = pdu_start(ent); 1036a42aaa3bSAlan D. Brunelle __u64 sector_from = __r->sector_from; 10372db270a8SFrederic Weisbecker 10382db270a8SFrederic Weisbecker r->device_from = be32_to_cpu(__r->device_from); 1039a42aaa3bSAlan D. Brunelle r->device_to = be32_to_cpu(__r->device_to); 1040a42aaa3bSAlan D. Brunelle r->sector_from = be64_to_cpu(sector_from); 10412db270a8SFrederic Weisbecker } 10422db270a8SFrederic Weisbecker 1043b6a4b0c3SLi Zefan typedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act); 1044b6a4b0c3SLi Zefan 1045b6a4b0c3SLi Zefan static int blk_log_action_classic(struct trace_iterator *iter, const char *act) 10462db270a8SFrederic Weisbecker { 10472db270a8SFrederic Weisbecker char rwbs[6]; 104835ac51bfSLi Zefan unsigned long long ts = iter->ts; 104935ac51bfSLi Zefan unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC); 10502db270a8SFrederic Weisbecker unsigned secs = (unsigned long)ts; 1051b6a4b0c3SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 10522db270a8SFrederic Weisbecker 10532db270a8SFrederic Weisbecker fill_rwbs(rwbs, t); 10542db270a8SFrederic Weisbecker 10552db270a8SFrederic Weisbecker return trace_seq_printf(&iter->seq, 105635ac51bfSLi Zefan "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ", 10572db270a8SFrederic Weisbecker MAJOR(t->device), MINOR(t->device), iter->cpu, 1058b6a4b0c3SLi Zefan secs, nsec_rem, iter->ent->pid, act, rwbs); 10592db270a8SFrederic Weisbecker } 10602db270a8SFrederic Weisbecker 1061b6a4b0c3SLi Zefan static int blk_log_action(struct trace_iterator *iter, const char *act) 10622db270a8SFrederic Weisbecker { 10632db270a8SFrederic Weisbecker char rwbs[6]; 1064b6a4b0c3SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(iter->ent); 1065b6a4b0c3SLi Zefan 10662db270a8SFrederic Weisbecker fill_rwbs(rwbs, t); 1067b6a4b0c3SLi Zefan return trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ", 10682db270a8SFrederic Weisbecker MAJOR(t->device), MINOR(t->device), act, rwbs); 10692db270a8SFrederic Weisbecker } 10702db270a8SFrederic Weisbecker 107166de7792SLi Zefan static int blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent) 107266de7792SLi Zefan { 107304986257SLi Zefan const unsigned char *pdu_buf; 107466de7792SLi Zefan int pdu_len; 107566de7792SLi Zefan int i, end, ret; 107666de7792SLi Zefan 107766de7792SLi Zefan pdu_buf = pdu_start(ent); 107866de7792SLi Zefan pdu_len = te_blk_io_trace(ent)->pdu_len; 107966de7792SLi Zefan 108066de7792SLi Zefan if (!pdu_len) 108166de7792SLi Zefan return 1; 108266de7792SLi Zefan 108366de7792SLi Zefan /* find the last zero that needs to be printed */ 108466de7792SLi Zefan for (end = pdu_len - 1; end >= 0; end--) 108566de7792SLi Zefan if (pdu_buf[end]) 108666de7792SLi Zefan break; 108766de7792SLi Zefan end++; 108866de7792SLi Zefan 108966de7792SLi Zefan if (!trace_seq_putc(s, '(')) 109066de7792SLi Zefan return 0; 109166de7792SLi Zefan 109266de7792SLi Zefan for (i = 0; i < pdu_len; i++) { 109366de7792SLi Zefan 109466de7792SLi Zefan ret = trace_seq_printf(s, "%s%02x", 109566de7792SLi Zefan i == 0 ? "" : " ", pdu_buf[i]); 109666de7792SLi Zefan if (!ret) 109766de7792SLi Zefan return ret; 109866de7792SLi Zefan 109966de7792SLi Zefan /* 110066de7792SLi Zefan * stop when the rest is just zeroes and indicate so 110166de7792SLi Zefan * with a ".." appended 110266de7792SLi Zefan */ 110366de7792SLi Zefan if (i == end && end != pdu_len - 1) 110466de7792SLi Zefan return trace_seq_puts(s, " ..) "); 110566de7792SLi Zefan } 110666de7792SLi Zefan 110766de7792SLi Zefan return trace_seq_puts(s, ") "); 110866de7792SLi Zefan } 110966de7792SLi Zefan 11102db270a8SFrederic Weisbecker static int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent) 11112db270a8SFrederic Weisbecker { 11124ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 11134ca53085SSteven Rostedt 11144ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 11152db270a8SFrederic Weisbecker 111666de7792SLi Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 111766de7792SLi Zefan int ret; 111866de7792SLi Zefan 111966de7792SLi Zefan ret = trace_seq_printf(s, "%u ", t_bytes(ent)); 112066de7792SLi Zefan if (!ret) 112166de7792SLi Zefan return 0; 112266de7792SLi Zefan ret = blk_log_dump_pdu(s, ent); 112366de7792SLi Zefan if (!ret) 112466de7792SLi Zefan return 0; 112566de7792SLi Zefan return trace_seq_printf(s, "[%s]\n", cmd); 112666de7792SLi Zefan } else { 11272db270a8SFrederic Weisbecker if (t_sec(ent)) 11282db270a8SFrederic Weisbecker return trace_seq_printf(s, "%llu + %u [%s]\n", 11292db270a8SFrederic Weisbecker t_sector(ent), t_sec(ent), cmd); 11302db270a8SFrederic Weisbecker return trace_seq_printf(s, "[%s]\n", cmd); 11312db270a8SFrederic Weisbecker } 113266de7792SLi Zefan } 11332db270a8SFrederic Weisbecker 11342db270a8SFrederic Weisbecker static int blk_log_with_error(struct trace_seq *s, 11352db270a8SFrederic Weisbecker const struct trace_entry *ent) 11362db270a8SFrederic Weisbecker { 113766de7792SLi Zefan if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) { 113866de7792SLi Zefan int ret; 113966de7792SLi Zefan 114066de7792SLi Zefan ret = blk_log_dump_pdu(s, ent); 114166de7792SLi Zefan if (ret) 114266de7792SLi Zefan return trace_seq_printf(s, "[%d]\n", t_error(ent)); 114366de7792SLi Zefan return 0; 114466de7792SLi Zefan } else { 11452db270a8SFrederic Weisbecker if (t_sec(ent)) 114666de7792SLi Zefan return trace_seq_printf(s, "%llu + %u [%d]\n", 114766de7792SLi Zefan t_sector(ent), 11482db270a8SFrederic Weisbecker t_sec(ent), t_error(ent)); 114966de7792SLi Zefan return trace_seq_printf(s, "%llu [%d]\n", 115066de7792SLi Zefan t_sector(ent), t_error(ent)); 115166de7792SLi Zefan } 11522db270a8SFrederic Weisbecker } 11532db270a8SFrederic Weisbecker 11542db270a8SFrederic Weisbecker static int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent) 11552db270a8SFrederic Weisbecker { 1156a42aaa3bSAlan D. Brunelle struct blk_io_trace_remap r = { .device_from = 0, }; 11572db270a8SFrederic Weisbecker 11582db270a8SFrederic Weisbecker get_pdu_remap(ent, &r); 11592db270a8SFrederic Weisbecker return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", 1160a42aaa3bSAlan D. Brunelle t_sector(ent), t_sec(ent), 1161a42aaa3bSAlan D. Brunelle MAJOR(r.device_from), MINOR(r.device_from), 1162a42aaa3bSAlan D. Brunelle (unsigned long long)r.sector_from); 11632db270a8SFrederic Weisbecker } 11642db270a8SFrederic Weisbecker 11652db270a8SFrederic Weisbecker static int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent) 11662db270a8SFrederic Weisbecker { 11674ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 11684ca53085SSteven Rostedt 11694ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 11704ca53085SSteven Rostedt 11714ca53085SSteven Rostedt return trace_seq_printf(s, "[%s]\n", cmd); 11722db270a8SFrederic Weisbecker } 11732db270a8SFrederic Weisbecker 11742db270a8SFrederic Weisbecker static int blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent) 11752db270a8SFrederic Weisbecker { 11764ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 11774ca53085SSteven Rostedt 11784ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 11794ca53085SSteven Rostedt 11804ca53085SSteven Rostedt return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent)); 11812db270a8SFrederic Weisbecker } 11822db270a8SFrederic Weisbecker 11832db270a8SFrederic Weisbecker static int blk_log_split(struct trace_seq *s, const struct trace_entry *ent) 11842db270a8SFrederic Weisbecker { 11854ca53085SSteven Rostedt char cmd[TASK_COMM_LEN]; 11864ca53085SSteven Rostedt 11874ca53085SSteven Rostedt trace_find_cmdline(ent->pid, cmd); 11884ca53085SSteven Rostedt 11892db270a8SFrederic Weisbecker return trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent), 11904ca53085SSteven Rostedt get_pdu_int(ent), cmd); 11912db270a8SFrederic Weisbecker } 11922db270a8SFrederic Weisbecker 119318cea459SLi Zefan static int blk_log_msg(struct trace_seq *s, const struct trace_entry *ent) 119418cea459SLi Zefan { 119518cea459SLi Zefan int ret; 119618cea459SLi Zefan const struct blk_io_trace *t = te_blk_io_trace(ent); 119718cea459SLi Zefan 119818cea459SLi Zefan ret = trace_seq_putmem(s, t + 1, t->pdu_len); 119918cea459SLi Zefan if (ret) 120018cea459SLi Zefan return trace_seq_putc(s, '\n'); 120118cea459SLi Zefan return ret; 120218cea459SLi Zefan } 120318cea459SLi Zefan 12042db270a8SFrederic Weisbecker /* 12052db270a8SFrederic Weisbecker * struct tracer operations 12062db270a8SFrederic Weisbecker */ 12072db270a8SFrederic Weisbecker 12082db270a8SFrederic Weisbecker static void blk_tracer_print_header(struct seq_file *m) 12092db270a8SFrederic Weisbecker { 12102db270a8SFrederic Weisbecker if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 12112db270a8SFrederic Weisbecker return; 12122db270a8SFrederic Weisbecker seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n" 12132db270a8SFrederic Weisbecker "# | | | | | |\n"); 12142db270a8SFrederic Weisbecker } 12152db270a8SFrederic Weisbecker 12162db270a8SFrederic Weisbecker static void blk_tracer_start(struct trace_array *tr) 12172db270a8SFrederic Weisbecker { 1218ad5dd549SLi Zefan blk_tracer_enabled = true; 12192db270a8SFrederic Weisbecker } 12202db270a8SFrederic Weisbecker 12212db270a8SFrederic Weisbecker static int blk_tracer_init(struct trace_array *tr) 12222db270a8SFrederic Weisbecker { 12232db270a8SFrederic Weisbecker blk_tr = tr; 12242db270a8SFrederic Weisbecker blk_tracer_start(tr); 12252db270a8SFrederic Weisbecker return 0; 12262db270a8SFrederic Weisbecker } 12272db270a8SFrederic Weisbecker 12282db270a8SFrederic Weisbecker static void blk_tracer_stop(struct trace_array *tr) 12292db270a8SFrederic Weisbecker { 1230ad5dd549SLi Zefan blk_tracer_enabled = false; 12312db270a8SFrederic Weisbecker } 12322db270a8SFrederic Weisbecker 12332db270a8SFrederic Weisbecker static void blk_tracer_reset(struct trace_array *tr) 12342db270a8SFrederic Weisbecker { 12352db270a8SFrederic Weisbecker blk_tracer_stop(tr); 12362db270a8SFrederic Weisbecker } 12372db270a8SFrederic Weisbecker 1238e4955c99SLi Zefan static const struct { 12392db270a8SFrederic Weisbecker const char *act[2]; 12402db270a8SFrederic Weisbecker int (*print)(struct trace_seq *s, const struct trace_entry *ent); 1241e4955c99SLi Zefan } what2act[] = { 12422db270a8SFrederic Weisbecker [__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic }, 12432db270a8SFrederic Weisbecker [__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic }, 12442db270a8SFrederic Weisbecker [__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic }, 12452db270a8SFrederic Weisbecker [__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic }, 12462db270a8SFrederic Weisbecker [__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic }, 12472db270a8SFrederic Weisbecker [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, 12482db270a8SFrederic Weisbecker [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, 12492db270a8SFrederic Weisbecker [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, 12502db270a8SFrederic Weisbecker [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, 12512db270a8SFrederic Weisbecker [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, 12522db270a8SFrederic Weisbecker [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, 12532db270a8SFrederic Weisbecker [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, 12542db270a8SFrederic Weisbecker [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, 12552db270a8SFrederic Weisbecker [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, 12562db270a8SFrederic Weisbecker [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, 12572db270a8SFrederic Weisbecker }; 12582db270a8SFrederic Weisbecker 1259b6a4b0c3SLi Zefan static enum print_line_t print_one_line(struct trace_iterator *iter, 1260b6a4b0c3SLi Zefan bool classic) 12612db270a8SFrederic Weisbecker { 12622db270a8SFrederic Weisbecker struct trace_seq *s = &iter->seq; 1263b6a4b0c3SLi Zefan const struct blk_io_trace *t; 1264b6a4b0c3SLi Zefan u16 what; 12652db270a8SFrederic Weisbecker int ret; 1266b6a4b0c3SLi Zefan bool long_act; 1267b6a4b0c3SLi Zefan blk_log_action_t *log_action; 12682db270a8SFrederic Weisbecker 1269b6a4b0c3SLi Zefan t = te_blk_io_trace(iter->ent); 1270b6a4b0c3SLi Zefan what = t->action & ((1 << BLK_TC_SHIFT) - 1); 1271b6a4b0c3SLi Zefan long_act = !!(trace_flags & TRACE_ITER_VERBOSE); 1272b6a4b0c3SLi Zefan log_action = classic ? &blk_log_action_classic : &blk_log_action; 12732db270a8SFrederic Weisbecker 127418cea459SLi Zefan if (t->action == BLK_TN_MESSAGE) { 127518cea459SLi Zefan ret = log_action(iter, long_act ? "message" : "m"); 127618cea459SLi Zefan if (ret) 127718cea459SLi Zefan ret = blk_log_msg(s, iter->ent); 127818cea459SLi Zefan goto out; 127918cea459SLi Zefan } 128018cea459SLi Zefan 1281eb08f8ebSLi Zefan if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act))) 1282b78825d6SLi Zefan ret = trace_seq_printf(s, "Unknown action %x\n", what); 12832db270a8SFrederic Weisbecker else { 1284b6a4b0c3SLi Zefan ret = log_action(iter, what2act[what].act[long_act]); 12852db270a8SFrederic Weisbecker if (ret) 12862db270a8SFrederic Weisbecker ret = what2act[what].print(s, iter->ent); 12872db270a8SFrederic Weisbecker } 128818cea459SLi Zefan out: 12892db270a8SFrederic Weisbecker return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 12902db270a8SFrederic Weisbecker } 12912db270a8SFrederic Weisbecker 1292b6a4b0c3SLi Zefan static enum print_line_t blk_trace_event_print(struct trace_iterator *iter, 1293b6a4b0c3SLi Zefan int flags) 1294b6a4b0c3SLi Zefan { 1295b6a4b0c3SLi Zefan return print_one_line(iter, false); 1296b6a4b0c3SLi Zefan } 1297b6a4b0c3SLi Zefan 12982db270a8SFrederic Weisbecker static int blk_trace_synthesize_old_trace(struct trace_iterator *iter) 12992db270a8SFrederic Weisbecker { 13002db270a8SFrederic Weisbecker struct trace_seq *s = &iter->seq; 13012db270a8SFrederic Weisbecker struct blk_io_trace *t = (struct blk_io_trace *)iter->ent; 13022db270a8SFrederic Weisbecker const int offset = offsetof(struct blk_io_trace, sector); 13032db270a8SFrederic Weisbecker struct blk_io_trace old = { 13042db270a8SFrederic Weisbecker .magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION, 13056c051ce0SLi Zefan .time = iter->ts, 13062db270a8SFrederic Weisbecker }; 13072db270a8SFrederic Weisbecker 13082db270a8SFrederic Weisbecker if (!trace_seq_putmem(s, &old, offset)) 13092db270a8SFrederic Weisbecker return 0; 13102db270a8SFrederic Weisbecker return trace_seq_putmem(s, &t->sector, 13112db270a8SFrederic Weisbecker sizeof(old) - offset + t->pdu_len); 13122db270a8SFrederic Weisbecker } 13132db270a8SFrederic Weisbecker 13142db270a8SFrederic Weisbecker static enum print_line_t 13152db270a8SFrederic Weisbecker blk_trace_event_print_binary(struct trace_iterator *iter, int flags) 13162db270a8SFrederic Weisbecker { 13172db270a8SFrederic Weisbecker return blk_trace_synthesize_old_trace(iter) ? 13182db270a8SFrederic Weisbecker TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE; 13192db270a8SFrederic Weisbecker } 13202db270a8SFrederic Weisbecker 13212db270a8SFrederic Weisbecker static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) 13222db270a8SFrederic Weisbecker { 13232db270a8SFrederic Weisbecker if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) 13242db270a8SFrederic Weisbecker return TRACE_TYPE_UNHANDLED; 13252db270a8SFrederic Weisbecker 1326b6a4b0c3SLi Zefan return print_one_line(iter, true); 13272db270a8SFrederic Weisbecker } 13282db270a8SFrederic Weisbecker 1329f3948f88SLi Zefan static int blk_tracer_set_flag(u32 old_flags, u32 bit, int set) 1330f3948f88SLi Zefan { 1331f3948f88SLi Zefan /* don't output context-info for blk_classic output */ 1332f3948f88SLi Zefan if (bit == TRACE_BLK_OPT_CLASSIC) { 1333f3948f88SLi Zefan if (set) 1334f3948f88SLi Zefan trace_flags &= ~TRACE_ITER_CONTEXT_INFO; 1335f3948f88SLi Zefan else 1336f3948f88SLi Zefan trace_flags |= TRACE_ITER_CONTEXT_INFO; 1337f3948f88SLi Zefan } 1338f3948f88SLi Zefan return 0; 1339f3948f88SLi Zefan } 1340f3948f88SLi Zefan 13412db270a8SFrederic Weisbecker static struct tracer blk_tracer __read_mostly = { 13422db270a8SFrederic Weisbecker .name = "blk", 13432db270a8SFrederic Weisbecker .init = blk_tracer_init, 13442db270a8SFrederic Weisbecker .reset = blk_tracer_reset, 13452db270a8SFrederic Weisbecker .start = blk_tracer_start, 13462db270a8SFrederic Weisbecker .stop = blk_tracer_stop, 13472db270a8SFrederic Weisbecker .print_header = blk_tracer_print_header, 13482db270a8SFrederic Weisbecker .print_line = blk_tracer_print_line, 13492db270a8SFrederic Weisbecker .flags = &blk_tracer_flags, 1350f3948f88SLi Zefan .set_flag = blk_tracer_set_flag, 13512db270a8SFrederic Weisbecker }; 13522db270a8SFrederic Weisbecker 13532db270a8SFrederic Weisbecker static struct trace_event trace_blk_event = { 13542db270a8SFrederic Weisbecker .type = TRACE_BLK, 13552db270a8SFrederic Weisbecker .trace = blk_trace_event_print, 13562db270a8SFrederic Weisbecker .binary = blk_trace_event_print_binary, 13572db270a8SFrederic Weisbecker }; 13582db270a8SFrederic Weisbecker 13592db270a8SFrederic Weisbecker static int __init init_blk_tracer(void) 13602db270a8SFrederic Weisbecker { 13612db270a8SFrederic Weisbecker if (!register_ftrace_event(&trace_blk_event)) { 13622db270a8SFrederic Weisbecker pr_warning("Warning: could not register block events\n"); 13632db270a8SFrederic Weisbecker return 1; 13642db270a8SFrederic Weisbecker } 13652db270a8SFrederic Weisbecker 13662db270a8SFrederic Weisbecker if (register_tracer(&blk_tracer) != 0) { 13672db270a8SFrederic Weisbecker pr_warning("Warning: could not register the block tracer\n"); 13682db270a8SFrederic Weisbecker unregister_ftrace_event(&trace_blk_event); 13692db270a8SFrederic Weisbecker return 1; 13702db270a8SFrederic Weisbecker } 13712db270a8SFrederic Weisbecker 13722db270a8SFrederic Weisbecker return 0; 13732db270a8SFrederic Weisbecker } 13742db270a8SFrederic Weisbecker 13752db270a8SFrederic Weisbecker device_initcall(init_blk_tracer); 13762db270a8SFrederic Weisbecker 13772db270a8SFrederic Weisbecker static int blk_trace_remove_queue(struct request_queue *q) 13782db270a8SFrederic Weisbecker { 13792db270a8SFrederic Weisbecker struct blk_trace *bt; 13802db270a8SFrederic Weisbecker 13812db270a8SFrederic Weisbecker bt = xchg(&q->blk_trace, NULL); 13822db270a8SFrederic Weisbecker if (bt == NULL) 13832db270a8SFrederic Weisbecker return -EINVAL; 13842db270a8SFrederic Weisbecker 138517ba97e3SLi Zefan if (atomic_dec_and_test(&blk_probes_ref)) 138617ba97e3SLi Zefan blk_unregister_tracepoints(); 138717ba97e3SLi Zefan 1388ad5dd549SLi Zefan blk_trace_free(bt); 13892db270a8SFrederic Weisbecker return 0; 13902db270a8SFrederic Weisbecker } 13912db270a8SFrederic Weisbecker 13922db270a8SFrederic Weisbecker /* 13932db270a8SFrederic Weisbecker * Setup everything required to start tracing 13942db270a8SFrederic Weisbecker */ 13959908c309SLi Zefan static int blk_trace_setup_queue(struct request_queue *q, 13969908c309SLi Zefan struct block_device *bdev) 13972db270a8SFrederic Weisbecker { 13982db270a8SFrederic Weisbecker struct blk_trace *old_bt, *bt = NULL; 139918cea459SLi Zefan int ret = -ENOMEM; 14002db270a8SFrederic Weisbecker 14012db270a8SFrederic Weisbecker bt = kzalloc(sizeof(*bt), GFP_KERNEL); 14022db270a8SFrederic Weisbecker if (!bt) 140315152e44SLi Zefan return -ENOMEM; 14042db270a8SFrederic Weisbecker 140518cea459SLi Zefan bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 140618cea459SLi Zefan if (!bt->msg_data) 140718cea459SLi Zefan goto free_bt; 140818cea459SLi Zefan 14099908c309SLi Zefan bt->dev = bdev->bd_dev; 14102db270a8SFrederic Weisbecker bt->act_mask = (u16)-1; 14119908c309SLi Zefan 14129908c309SLi Zefan blk_trace_setup_lba(bt, bdev); 14132db270a8SFrederic Weisbecker 14142db270a8SFrederic Weisbecker old_bt = xchg(&q->blk_trace, bt); 14152db270a8SFrederic Weisbecker if (old_bt != NULL) { 14162db270a8SFrederic Weisbecker (void)xchg(&q->blk_trace, old_bt); 141718cea459SLi Zefan ret = -EBUSY; 141818cea459SLi Zefan goto free_bt; 14192db270a8SFrederic Weisbecker } 142015152e44SLi Zefan 142117ba97e3SLi Zefan if (atomic_inc_return(&blk_probes_ref) == 1) 142217ba97e3SLi Zefan blk_register_tracepoints(); 14232db270a8SFrederic Weisbecker return 0; 142418cea459SLi Zefan 142518cea459SLi Zefan free_bt: 142618cea459SLi Zefan blk_trace_free(bt); 142718cea459SLi Zefan return ret; 14282db270a8SFrederic Weisbecker } 14292db270a8SFrederic Weisbecker 14302db270a8SFrederic Weisbecker /* 14312db270a8SFrederic Weisbecker * sysfs interface to enable and configure tracing 14322db270a8SFrederic Weisbecker */ 14332db270a8SFrederic Weisbecker 14342db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_show(struct device *dev, 14352db270a8SFrederic Weisbecker struct device_attribute *attr, 14362db270a8SFrederic Weisbecker char *buf); 14372db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_store(struct device *dev, 14382db270a8SFrederic Weisbecker struct device_attribute *attr, 14392db270a8SFrederic Weisbecker const char *buf, size_t count); 14402db270a8SFrederic Weisbecker #define BLK_TRACE_DEVICE_ATTR(_name) \ 14412db270a8SFrederic Weisbecker DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \ 14422db270a8SFrederic Weisbecker sysfs_blk_trace_attr_show, \ 14432db270a8SFrederic Weisbecker sysfs_blk_trace_attr_store) 14442db270a8SFrederic Weisbecker 1445cd649b8bSLi Zefan static BLK_TRACE_DEVICE_ATTR(enable); 14462db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(act_mask); 14472db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(pid); 14482db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(start_lba); 14492db270a8SFrederic Weisbecker static BLK_TRACE_DEVICE_ATTR(end_lba); 14502db270a8SFrederic Weisbecker 14512db270a8SFrederic Weisbecker static struct attribute *blk_trace_attrs[] = { 14522db270a8SFrederic Weisbecker &dev_attr_enable.attr, 14532db270a8SFrederic Weisbecker &dev_attr_act_mask.attr, 14542db270a8SFrederic Weisbecker &dev_attr_pid.attr, 14552db270a8SFrederic Weisbecker &dev_attr_start_lba.attr, 14562db270a8SFrederic Weisbecker &dev_attr_end_lba.attr, 14572db270a8SFrederic Weisbecker NULL 14582db270a8SFrederic Weisbecker }; 14592db270a8SFrederic Weisbecker 14602db270a8SFrederic Weisbecker struct attribute_group blk_trace_attr_group = { 14612db270a8SFrederic Weisbecker .name = "trace", 14622db270a8SFrederic Weisbecker .attrs = blk_trace_attrs, 14632db270a8SFrederic Weisbecker }; 14642db270a8SFrederic Weisbecker 146509341997SLi Zefan static const struct { 146609341997SLi Zefan int mask; 146709341997SLi Zefan const char *str; 146809341997SLi Zefan } mask_maps[] = { 146909341997SLi Zefan { BLK_TC_READ, "read" }, 147009341997SLi Zefan { BLK_TC_WRITE, "write" }, 147109341997SLi Zefan { BLK_TC_BARRIER, "barrier" }, 147209341997SLi Zefan { BLK_TC_SYNC, "sync" }, 147309341997SLi Zefan { BLK_TC_QUEUE, "queue" }, 147409341997SLi Zefan { BLK_TC_REQUEUE, "requeue" }, 147509341997SLi Zefan { BLK_TC_ISSUE, "issue" }, 147609341997SLi Zefan { BLK_TC_COMPLETE, "complete" }, 147709341997SLi Zefan { BLK_TC_FS, "fs" }, 147809341997SLi Zefan { BLK_TC_PC, "pc" }, 147909341997SLi Zefan { BLK_TC_AHEAD, "ahead" }, 148009341997SLi Zefan { BLK_TC_META, "meta" }, 148109341997SLi Zefan { BLK_TC_DISCARD, "discard" }, 148209341997SLi Zefan { BLK_TC_DRV_DATA, "drv_data" }, 148309341997SLi Zefan }; 148409341997SLi Zefan 148509341997SLi Zefan static int blk_trace_str2mask(const char *str) 14862db270a8SFrederic Weisbecker { 148709341997SLi Zefan int i; 14882db270a8SFrederic Weisbecker int mask = 0; 14899eb85125SLi Zefan char *buf, *s, *token; 14902db270a8SFrederic Weisbecker 14919eb85125SLi Zefan buf = kstrdup(str, GFP_KERNEL); 14929eb85125SLi Zefan if (buf == NULL) 14932db270a8SFrederic Weisbecker return -ENOMEM; 14949eb85125SLi Zefan s = strstrip(buf); 14952db270a8SFrederic Weisbecker 14962db270a8SFrederic Weisbecker while (1) { 149709341997SLi Zefan token = strsep(&s, ","); 149809341997SLi Zefan if (token == NULL) 14992db270a8SFrederic Weisbecker break; 15002db270a8SFrederic Weisbecker 150109341997SLi Zefan if (*token == '\0') 150209341997SLi Zefan continue; 150309341997SLi Zefan 150409341997SLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 150509341997SLi Zefan if (strcasecmp(token, mask_maps[i].str) == 0) { 150609341997SLi Zefan mask |= mask_maps[i].mask; 150709341997SLi Zefan break; 15082db270a8SFrederic Weisbecker } 150909341997SLi Zefan } 151009341997SLi Zefan if (i == ARRAY_SIZE(mask_maps)) { 151109341997SLi Zefan mask = -EINVAL; 151209341997SLi Zefan break; 151309341997SLi Zefan } 151409341997SLi Zefan } 15159eb85125SLi Zefan kfree(buf); 15162db270a8SFrederic Weisbecker 15172db270a8SFrederic Weisbecker return mask; 15182db270a8SFrederic Weisbecker } 15192db270a8SFrederic Weisbecker 152009341997SLi Zefan static ssize_t blk_trace_mask2str(char *buf, int mask) 152109341997SLi Zefan { 152209341997SLi Zefan int i; 152309341997SLi Zefan char *p = buf; 152409341997SLi Zefan 152509341997SLi Zefan for (i = 0; i < ARRAY_SIZE(mask_maps); i++) { 152609341997SLi Zefan if (mask & mask_maps[i].mask) { 152709341997SLi Zefan p += sprintf(p, "%s%s", 152809341997SLi Zefan (p == buf) ? "" : ",", mask_maps[i].str); 152909341997SLi Zefan } 153009341997SLi Zefan } 153109341997SLi Zefan *p++ = '\n'; 153209341997SLi Zefan 153309341997SLi Zefan return p - buf; 153409341997SLi Zefan } 153509341997SLi Zefan 1536b125130bSLi Zefan static struct request_queue *blk_trace_get_queue(struct block_device *bdev) 1537b125130bSLi Zefan { 1538b125130bSLi Zefan if (bdev->bd_disk == NULL) 1539b125130bSLi Zefan return NULL; 1540b125130bSLi Zefan 1541b125130bSLi Zefan return bdev_get_queue(bdev); 1542b125130bSLi Zefan } 1543b125130bSLi Zefan 15442db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_show(struct device *dev, 15452db270a8SFrederic Weisbecker struct device_attribute *attr, 15462db270a8SFrederic Weisbecker char *buf) 15472db270a8SFrederic Weisbecker { 15482db270a8SFrederic Weisbecker struct hd_struct *p = dev_to_part(dev); 15492db270a8SFrederic Weisbecker struct request_queue *q; 15502db270a8SFrederic Weisbecker struct block_device *bdev; 15512db270a8SFrederic Weisbecker ssize_t ret = -ENXIO; 15522db270a8SFrederic Weisbecker 15532db270a8SFrederic Weisbecker lock_kernel(); 15542db270a8SFrederic Weisbecker bdev = bdget(part_devt(p)); 15552db270a8SFrederic Weisbecker if (bdev == NULL) 15562db270a8SFrederic Weisbecker goto out_unlock_kernel; 15572db270a8SFrederic Weisbecker 1558b125130bSLi Zefan q = blk_trace_get_queue(bdev); 15592db270a8SFrederic Weisbecker if (q == NULL) 15602db270a8SFrederic Weisbecker goto out_bdput; 1561b125130bSLi Zefan 15622db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 1563cd649b8bSLi Zefan 1564cd649b8bSLi Zefan if (attr == &dev_attr_enable) { 1565cd649b8bSLi Zefan ret = sprintf(buf, "%u\n", !!q->blk_trace); 1566cd649b8bSLi Zefan goto out_unlock_bdev; 1567cd649b8bSLi Zefan } 1568cd649b8bSLi Zefan 15692db270a8SFrederic Weisbecker if (q->blk_trace == NULL) 15702db270a8SFrederic Weisbecker ret = sprintf(buf, "disabled\n"); 15712db270a8SFrederic Weisbecker else if (attr == &dev_attr_act_mask) 157209341997SLi Zefan ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); 15732db270a8SFrederic Weisbecker else if (attr == &dev_attr_pid) 15742db270a8SFrederic Weisbecker ret = sprintf(buf, "%u\n", q->blk_trace->pid); 15752db270a8SFrederic Weisbecker else if (attr == &dev_attr_start_lba) 15762db270a8SFrederic Weisbecker ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); 15772db270a8SFrederic Weisbecker else if (attr == &dev_attr_end_lba) 15782db270a8SFrederic Weisbecker ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); 1579cd649b8bSLi Zefan 1580cd649b8bSLi Zefan out_unlock_bdev: 15812db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 15822db270a8SFrederic Weisbecker out_bdput: 15832db270a8SFrederic Weisbecker bdput(bdev); 15842db270a8SFrederic Weisbecker out_unlock_kernel: 15852db270a8SFrederic Weisbecker unlock_kernel(); 15862db270a8SFrederic Weisbecker return ret; 15872db270a8SFrederic Weisbecker } 15882db270a8SFrederic Weisbecker 15892db270a8SFrederic Weisbecker static ssize_t sysfs_blk_trace_attr_store(struct device *dev, 15902db270a8SFrederic Weisbecker struct device_attribute *attr, 15912db270a8SFrederic Weisbecker const char *buf, size_t count) 15922db270a8SFrederic Weisbecker { 15932db270a8SFrederic Weisbecker struct block_device *bdev; 15942db270a8SFrederic Weisbecker struct request_queue *q; 15952db270a8SFrederic Weisbecker struct hd_struct *p; 15962db270a8SFrederic Weisbecker u64 value; 159709341997SLi Zefan ssize_t ret = -EINVAL; 15982db270a8SFrederic Weisbecker 15992db270a8SFrederic Weisbecker if (count == 0) 16002db270a8SFrederic Weisbecker goto out; 16012db270a8SFrederic Weisbecker 16022db270a8SFrederic Weisbecker if (attr == &dev_attr_act_mask) { 16032db270a8SFrederic Weisbecker if (sscanf(buf, "%llx", &value) != 1) { 16042db270a8SFrederic Weisbecker /* Assume it is a list of trace category names */ 160509341997SLi Zefan ret = blk_trace_str2mask(buf); 160609341997SLi Zefan if (ret < 0) 16072db270a8SFrederic Weisbecker goto out; 160809341997SLi Zefan value = ret; 16092db270a8SFrederic Weisbecker } 16102db270a8SFrederic Weisbecker } else if (sscanf(buf, "%llu", &value) != 1) 16112db270a8SFrederic Weisbecker goto out; 16122db270a8SFrederic Weisbecker 161309341997SLi Zefan ret = -ENXIO; 161409341997SLi Zefan 16152db270a8SFrederic Weisbecker lock_kernel(); 16162db270a8SFrederic Weisbecker p = dev_to_part(dev); 16172db270a8SFrederic Weisbecker bdev = bdget(part_devt(p)); 16182db270a8SFrederic Weisbecker if (bdev == NULL) 16192db270a8SFrederic Weisbecker goto out_unlock_kernel; 16202db270a8SFrederic Weisbecker 1621b125130bSLi Zefan q = blk_trace_get_queue(bdev); 16222db270a8SFrederic Weisbecker if (q == NULL) 16232db270a8SFrederic Weisbecker goto out_bdput; 16242db270a8SFrederic Weisbecker 16252db270a8SFrederic Weisbecker mutex_lock(&bdev->bd_mutex); 1626cd649b8bSLi Zefan 1627cd649b8bSLi Zefan if (attr == &dev_attr_enable) { 1628cd649b8bSLi Zefan if (value) 16299908c309SLi Zefan ret = blk_trace_setup_queue(q, bdev); 1630cd649b8bSLi Zefan else 1631cd649b8bSLi Zefan ret = blk_trace_remove_queue(q); 1632cd649b8bSLi Zefan goto out_unlock_bdev; 1633cd649b8bSLi Zefan } 1634cd649b8bSLi Zefan 16352db270a8SFrederic Weisbecker ret = 0; 16362db270a8SFrederic Weisbecker if (q->blk_trace == NULL) 16379908c309SLi Zefan ret = blk_trace_setup_queue(q, bdev); 16382db270a8SFrederic Weisbecker 16392db270a8SFrederic Weisbecker if (ret == 0) { 16402db270a8SFrederic Weisbecker if (attr == &dev_attr_act_mask) 16412db270a8SFrederic Weisbecker q->blk_trace->act_mask = value; 16422db270a8SFrederic Weisbecker else if (attr == &dev_attr_pid) 16432db270a8SFrederic Weisbecker q->blk_trace->pid = value; 16442db270a8SFrederic Weisbecker else if (attr == &dev_attr_start_lba) 16452db270a8SFrederic Weisbecker q->blk_trace->start_lba = value; 16462db270a8SFrederic Weisbecker else if (attr == &dev_attr_end_lba) 16472db270a8SFrederic Weisbecker q->blk_trace->end_lba = value; 16482db270a8SFrederic Weisbecker } 1649cd649b8bSLi Zefan 1650cd649b8bSLi Zefan out_unlock_bdev: 16512db270a8SFrederic Weisbecker mutex_unlock(&bdev->bd_mutex); 16522db270a8SFrederic Weisbecker out_bdput: 16532db270a8SFrederic Weisbecker bdput(bdev); 16542db270a8SFrederic Weisbecker out_unlock_kernel: 16552db270a8SFrederic Weisbecker unlock_kernel(); 16562db270a8SFrederic Weisbecker out: 1657cd649b8bSLi Zefan return ret ? ret : count; 16582db270a8SFrederic Weisbecker } 1659cd649b8bSLi Zefan 16601d54ad6dSLi Zefan int blk_trace_init_sysfs(struct device *dev) 16611d54ad6dSLi Zefan { 16621d54ad6dSLi Zefan return sysfs_create_group(&dev->kobj, &blk_trace_attr_group); 16631d54ad6dSLi Zefan } 16641d54ad6dSLi Zefan 166555782138SLi Zefan #endif /* CONFIG_BLK_DEV_IO_TRACE */ 166655782138SLi Zefan 166755782138SLi Zefan #ifdef CONFIG_EVENT_TRACING 166855782138SLi Zefan 166955782138SLi Zefan void blk_dump_cmd(char *buf, struct request *rq) 167055782138SLi Zefan { 167155782138SLi Zefan int i, end; 167255782138SLi Zefan int len = rq->cmd_len; 167355782138SLi Zefan unsigned char *cmd = rq->cmd; 167455782138SLi Zefan 167555782138SLi Zefan if (!blk_pc_request(rq)) { 167655782138SLi Zefan buf[0] = '\0'; 167755782138SLi Zefan return; 167855782138SLi Zefan } 167955782138SLi Zefan 168055782138SLi Zefan for (end = len - 1; end >= 0; end--) 168155782138SLi Zefan if (cmd[end]) 168255782138SLi Zefan break; 168355782138SLi Zefan end++; 168455782138SLi Zefan 168555782138SLi Zefan for (i = 0; i < len; i++) { 168655782138SLi Zefan buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]); 168755782138SLi Zefan if (i == end && end != len - 1) { 168855782138SLi Zefan sprintf(buf, " .."); 168955782138SLi Zefan break; 169055782138SLi Zefan } 169155782138SLi Zefan } 169255782138SLi Zefan } 169355782138SLi Zefan 169455782138SLi Zefan void blk_fill_rwbs(char *rwbs, u32 rw, int bytes) 169555782138SLi Zefan { 169655782138SLi Zefan int i = 0; 169755782138SLi Zefan 169855782138SLi Zefan if (rw & WRITE) 169955782138SLi Zefan rwbs[i++] = 'W'; 170055782138SLi Zefan else if (rw & 1 << BIO_RW_DISCARD) 170155782138SLi Zefan rwbs[i++] = 'D'; 170255782138SLi Zefan else if (bytes) 170355782138SLi Zefan rwbs[i++] = 'R'; 170455782138SLi Zefan else 170555782138SLi Zefan rwbs[i++] = 'N'; 170655782138SLi Zefan 170755782138SLi Zefan if (rw & 1 << BIO_RW_AHEAD) 170855782138SLi Zefan rwbs[i++] = 'A'; 170955782138SLi Zefan if (rw & 1 << BIO_RW_BARRIER) 171055782138SLi Zefan rwbs[i++] = 'B'; 171155782138SLi Zefan if (rw & 1 << BIO_RW_SYNCIO) 171255782138SLi Zefan rwbs[i++] = 'S'; 171355782138SLi Zefan if (rw & 1 << BIO_RW_META) 171455782138SLi Zefan rwbs[i++] = 'M'; 171555782138SLi Zefan 171655782138SLi Zefan rwbs[i] = '\0'; 171755782138SLi Zefan } 171855782138SLi Zefan 171955782138SLi Zefan void blk_fill_rwbs_rq(char *rwbs, struct request *rq) 172055782138SLi Zefan { 172155782138SLi Zefan int rw = rq->cmd_flags & 0x03; 172255782138SLi Zefan int bytes; 172355782138SLi Zefan 172455782138SLi Zefan if (blk_discard_rq(rq)) 172555782138SLi Zefan rw |= (1 << BIO_RW_DISCARD); 172655782138SLi Zefan 1727c9059598SLinus Torvalds bytes = blk_rq_bytes(rq); 172855782138SLi Zefan 172955782138SLi Zefan blk_fill_rwbs(rwbs, rw, bytes); 173055782138SLi Zefan } 173155782138SLi Zefan 173255782138SLi Zefan #endif /* CONFIG_EVENT_TRACING */ 173355782138SLi Zefan 1734