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authorIngo Molnar <mingo@elte.hu>2009-04-01 21:54:19 +0200
committerIngo Molnar <mingo@elte.hu>2009-04-02 00:49:02 +0200
commit8302294f43250dc337108c51882a6007f2b1e2e0 (patch)
tree85acd4440799c46a372df9cad170fa0c21e59096 /block
parent4fe70410d9a219dabb47328effccae7e7f2a6e26 (diff)
parent2e572895bf3203e881356a4039ab0fa428ed2639 (diff)
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Merge branch 'tracing/core-v2' into tracing-for-linus
Conflicts: include/linux/slub_def.h lib/Kconfig.debug mm/slob.c mm/slub.c
Diffstat (limited to 'block')
-rw-r--r--block/Kconfig16
-rw-r--r--block/Makefile1
-rw-r--r--block/blktrace.c860
3 files changed, 0 insertions, 877 deletions
diff --git a/block/Kconfig b/block/Kconfig
index 0cbb3b88b59..e7d12782bcf 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -44,22 +44,6 @@ config LBD
If unsure, say N.
-config BLK_DEV_IO_TRACE
- bool "Support for tracing block io actions"
- depends on SYSFS
- select RELAY
- select DEBUG_FS
- select TRACEPOINTS
- help
- Say Y here if you want to be able to trace the block layer actions
- on a given queue. Tracing allows you to see any traffic happening
- on a block device queue. For more information (and the userspace
- support tools needed), fetch the blktrace tools from:
-
- git://git.kernel.dk/blktrace.git
-
- If unsure, say N.
-
config BLK_DEV_BSG
bool "Block layer SG support v4 (EXPERIMENTAL)"
depends on EXPERIMENTAL
diff --git a/block/Makefile b/block/Makefile
index bfe73049f93..e9fa4dd690f 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -13,6 +13,5 @@ obj-$(CONFIG_IOSCHED_AS) += as-iosched.o
obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o
obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o
-obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o
obj-$(CONFIG_BLK_DEV_INTEGRITY) += blk-integrity.o
diff --git a/block/blktrace.c b/block/blktrace.c
deleted file mode 100644
index 028120a0965..00000000000
--- a/block/blktrace.c
+++ /dev/null
@@ -1,860 +0,0 @@
-/*
- * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- */
-#include <linux/kernel.h>
-#include <linux/blkdev.h>
-#include <linux/blktrace_api.h>
-#include <linux/percpu.h>
-#include <linux/init.h>
-#include <linux/mutex.h>
-#include <linux/debugfs.h>
-#include <linux/time.h>
-#include <trace/block.h>
-#include <asm/uaccess.h>
-
-static unsigned int blktrace_seq __read_mostly = 1;
-
-/* Global reference count of probes */
-static DEFINE_MUTEX(blk_probe_mutex);
-static atomic_t blk_probes_ref = ATOMIC_INIT(0);
-
-static int blk_register_tracepoints(void);
-static void blk_unregister_tracepoints(void);
-
-/*
- * Send out a notify message.
- */
-static void trace_note(struct blk_trace *bt, pid_t pid, int action,
- const void *data, size_t len)
-{
- struct blk_io_trace *t;
-
- t = relay_reserve(bt->rchan, sizeof(*t) + len);
- if (t) {
- const int cpu = smp_processor_id();
-
- t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
- t->time = ktime_to_ns(ktime_get());
- t->device = bt->dev;
- t->action = action;
- t->pid = pid;
- t->cpu = cpu;
- t->pdu_len = len;
- memcpy((void *) t + sizeof(*t), data, len);
- }
-}
-
-/*
- * Send out a notify for this process, if we haven't done so since a trace
- * started
- */
-static void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk)
-{
- tsk->btrace_seq = blktrace_seq;
- trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm));
-}
-
-static void trace_note_time(struct blk_trace *bt)
-{
- struct timespec now;
- unsigned long flags;
- u32 words[2];
-
- getnstimeofday(&now);
- words[0] = now.tv_sec;
- words[1] = now.tv_nsec;
-
- local_irq_save(flags);
- trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words));
- local_irq_restore(flags);
-}
-
-void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
-{
- int n;
- va_list args;
- unsigned long flags;
- char *buf;
-
- local_irq_save(flags);
- buf = per_cpu_ptr(bt->msg_data, smp_processor_id());
- va_start(args, fmt);
- n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args);
- va_end(args);
-
- trace_note(bt, 0, BLK_TN_MESSAGE, buf, n);
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL_GPL(__trace_note_message);
-
-static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
- pid_t pid)
-{
- if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
- return 1;
- if (sector < bt->start_lba || sector > bt->end_lba)
- return 1;
- if (bt->pid && pid != bt->pid)
- return 1;
-
- return 0;
-}
-
-/*
- * Data direction bit lookup
- */
-static u32 ddir_act[2] __read_mostly = { BLK_TC_ACT(BLK_TC_READ), BLK_TC_ACT(BLK_TC_WRITE) };
-
-/* The ilog2() calls fall out because they're constant */
-#define MASK_TC_BIT(rw, __name) ( (rw & (1 << BIO_RW_ ## __name)) << \
- (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name) )
-
-/*
- * The worker for the various blk_add_trace*() types. Fills out a
- * blk_io_trace structure and places it in a per-cpu subbuffer.
- */
-static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
- int rw, u32 what, int error, int pdu_len, void *pdu_data)
-{
- struct task_struct *tsk = current;
- struct blk_io_trace *t;
- unsigned long flags;
- unsigned long *sequence;
- pid_t pid;
- int cpu;
-
- if (unlikely(bt->trace_state != Blktrace_running))
- return;
-
- what |= ddir_act[rw & WRITE];
- what |= MASK_TC_BIT(rw, BARRIER);
- what |= MASK_TC_BIT(rw, SYNCIO);
- what |= MASK_TC_BIT(rw, AHEAD);
- what |= MASK_TC_BIT(rw, META);
- what |= MASK_TC_BIT(rw, DISCARD);
-
- pid = tsk->pid;
- if (unlikely(act_log_check(bt, what, sector, pid)))
- return;
-
- /*
- * A word about the locking here - we disable interrupts to reserve
- * some space in the relay per-cpu buffer, to prevent an irq
- * from coming in and stepping on our toes.
- */
- local_irq_save(flags);
-
- if (unlikely(tsk->btrace_seq != blktrace_seq))
- trace_note_tsk(bt, tsk);
-
- t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len);
- if (t) {
- cpu = smp_processor_id();
- sequence = per_cpu_ptr(bt->sequence, cpu);
-
- t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
- t->sequence = ++(*sequence);
- t->time = ktime_to_ns(ktime_get());
- t->sector = sector;
- t->bytes = bytes;
- t->action = what;
- t->pid = pid;
- t->device = bt->dev;
- t->cpu = cpu;
- t->error = error;
- t->pdu_len = pdu_len;
-
- if (pdu_len)
- memcpy((void *) t + sizeof(*t), pdu_data, pdu_len);
- }
-
- local_irq_restore(flags);
-}
-
-static struct dentry *blk_tree_root;
-static DEFINE_MUTEX(blk_tree_mutex);
-
-static void blk_trace_cleanup(struct blk_trace *bt)
-{
- debugfs_remove(bt->msg_file);
- debugfs_remove(bt->dropped_file);
- relay_close(bt->rchan);
- free_percpu(bt->sequence);
- free_percpu(bt->msg_data);
- kfree(bt);
- mutex_lock(&blk_probe_mutex);
- if (atomic_dec_and_test(&blk_probes_ref))
- blk_unregister_tracepoints();
- mutex_unlock(&blk_probe_mutex);
-}
-
-int blk_trace_remove(struct request_queue *q)
-{
- struct blk_trace *bt;
-
- bt = xchg(&q->blk_trace, NULL);
- if (!bt)
- return -EINVAL;
-
- if (bt->trace_state == Blktrace_setup ||
- bt->trace_state == Blktrace_stopped)
- blk_trace_cleanup(bt);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(blk_trace_remove);
-
-static int blk_dropped_open(struct inode *inode, struct file *filp)
-{
- filp->private_data = inode->i_private;
-
- return 0;
-}
-
-static ssize_t blk_dropped_read(struct file *filp, char __user *buffer,
- size_t count, loff_t *ppos)
-{
- struct blk_trace *bt = filp->private_data;
- char buf[16];
-
- snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped));
-
- return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
-}
-
-static const struct file_operations blk_dropped_fops = {
- .owner = THIS_MODULE,
- .open = blk_dropped_open,
- .read = blk_dropped_read,
-};
-
-static int blk_msg_open(struct inode *inode, struct file *filp)
-{
- filp->private_data = inode->i_private;
-
- return 0;
-}
-
-static ssize_t blk_msg_write(struct file *filp, const char __user *buffer,
- size_t count, loff_t *ppos)
-{
- char *msg;
- struct blk_trace *bt;
-
- if (count > BLK_TN_MAX_MSG)
- return -EINVAL;
-
- msg = kmalloc(count, GFP_KERNEL);
- if (msg == NULL)
- return -ENOMEM;
-
- if (copy_from_user(msg, buffer, count)) {
- kfree(msg);
- return -EFAULT;
- }
-
- bt = filp->private_data;
- __trace_note_message(bt, "%s", msg);
- kfree(msg);
-
- return count;
-}
-
-static const struct file_operations blk_msg_fops = {
- .owner = THIS_MODULE,
- .open = blk_msg_open,
- .write = blk_msg_write,
-};
-
-/*
- * Keep track of how many times we encountered a full subbuffer, to aid
- * the user space app in telling how many lost events there were.
- */
-static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf,
- void *prev_subbuf, size_t prev_padding)
-{
- struct blk_trace *bt;
-
- if (!relay_buf_full(buf))
- return 1;
-
- bt = buf->chan->private_data;
- atomic_inc(&bt->dropped);
- return 0;
-}
-
-static int blk_remove_buf_file_callback(struct dentry *dentry)
-{
- struct dentry *parent = dentry->d_parent;
- debugfs_remove(dentry);
-
- /*
- * this will fail for all but the last file, but that is ok. what we
- * care about is the top level buts->name directory going away, when
- * the last trace file is gone. Then we don't have to rmdir() that
- * manually on trace stop, so it nicely solves the issue with
- * force killing of running traces.
- */
-
- debugfs_remove(parent);
- return 0;
-}
-
-static struct dentry *blk_create_buf_file_callback(const char *filename,
- struct dentry *parent,
- int mode,
- struct rchan_buf *buf,
- int *is_global)
-{
- return debugfs_create_file(filename, mode, parent, buf,
- &relay_file_operations);
-}
-
-static struct rchan_callbacks blk_relay_callbacks = {
- .subbuf_start = blk_subbuf_start_callback,
- .create_buf_file = blk_create_buf_file_callback,
- .remove_buf_file = blk_remove_buf_file_callback,
-};
-
-/*
- * Setup everything required to start tracing
- */
-int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
- struct blk_user_trace_setup *buts)
-{
- struct blk_trace *old_bt, *bt = NULL;
- struct dentry *dir = NULL;
- int ret, i;
-
- if (!buts->buf_size || !buts->buf_nr)
- return -EINVAL;
-
- strncpy(buts->name, name, BLKTRACE_BDEV_SIZE);
- buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0';
-
- /*
- * some device names have larger paths - convert the slashes
- * to underscores for this to work as expected
- */
- for (i = 0; i < strlen(buts->name); i++)
- if (buts->name[i] == '/')
- buts->name[i] = '_';
-
- ret = -ENOMEM;
- bt = kzalloc(sizeof(*bt), GFP_KERNEL);
- if (!bt)
- goto err;
-
- bt->sequence = alloc_percpu(unsigned long);
- if (!bt->sequence)
- goto err;
-
- bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char));
- if (!bt->msg_data)
- goto err;
-
- ret = -ENOENT;
-
- if (!blk_tree_root) {
- blk_tree_root = debugfs_create_dir("block", NULL);
- if (!blk_tree_root)
- return -ENOMEM;
- }
-
- dir = debugfs_create_dir(buts->name, blk_tree_root);
-
- if (!dir)
- goto err;
-
- bt->dir = dir;
- bt->dev = dev;
- atomic_set(&bt->dropped, 0);
-
- ret = -EIO;
- bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, &blk_dropped_fops);
- if (!bt->dropped_file)
- goto err;
-
- bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops);
- if (!bt->msg_file)
- goto err;
-
- bt->rchan = relay_open("trace", dir, buts->buf_size,
- buts->buf_nr, &blk_relay_callbacks, bt);
- if (!bt->rchan)
- goto err;
-
- bt->act_mask = buts->act_mask;
- if (!bt->act_mask)
- bt->act_mask = (u16) -1;
-
- bt->start_lba = buts->start_lba;
- bt->end_lba = buts->end_lba;
- if (!bt->end_lba)
- bt->end_lba = -1ULL;
-
- bt->pid = buts->pid;
- bt->trace_state = Blktrace_setup;
-
- mutex_lock(&blk_probe_mutex);
- if (atomic_add_return(1, &blk_probes_ref) == 1) {
- ret = blk_register_tracepoints();
- if (ret)
- goto probe_err;
- }
- mutex_unlock(&blk_probe_mutex);
-
- ret = -EBUSY;
- old_bt = xchg(&q->blk_trace, bt);
- if (old_bt) {
- (void) xchg(&q->blk_trace, old_bt);
- goto err;
- }
-
- return 0;
-probe_err:
- atomic_dec(&blk_probes_ref);
- mutex_unlock(&blk_probe_mutex);
-err:
- if (bt) {
- if (bt->msg_file)
- debugfs_remove(bt->msg_file);
- if (bt->dropped_file)
- debugfs_remove(bt->dropped_file);
- free_percpu(bt->sequence);
- free_percpu(bt->msg_data);
- if (bt->rchan)
- relay_close(bt->rchan);
- kfree(bt);
- }
- return ret;
-}
-
-int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
- char __user *arg)
-{
- struct blk_user_trace_setup buts;
- int ret;
-
- ret = copy_from_user(&buts, arg, sizeof(buts));
- if (ret)
- return -EFAULT;
-
- ret = do_blk_trace_setup(q, name, dev, &buts);
- if (ret)
- return ret;
-
- if (copy_to_user(arg, &buts, sizeof(buts)))
- return -EFAULT;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(blk_trace_setup);
-
-int blk_trace_startstop(struct request_queue *q, int start)
-{
- struct blk_trace *bt;
- int ret;
-
- if ((bt = q->blk_trace) == NULL)
- return -EINVAL;
-
- /*
- * For starting a trace, we can transition from a setup or stopped
- * trace. For stopping a trace, the state must be running
- */
- ret = -EINVAL;
- if (start) {
- if (bt->trace_state == Blktrace_setup ||
- bt->trace_state == Blktrace_stopped) {
- blktrace_seq++;
- smp_mb();
- bt->trace_state = Blktrace_running;
-
- trace_note_time(bt);
- ret = 0;
- }
- } else {
- if (bt->trace_state == Blktrace_running) {
- bt->trace_state = Blktrace_stopped;
- relay_flush(bt->rchan);
- ret = 0;
- }
- }
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(blk_trace_startstop);
-
-/**
- * blk_trace_ioctl: - handle the ioctls associated with tracing
- * @bdev: the block device
- * @cmd: the ioctl cmd
- * @arg: the argument data, if any
- *
- **/
-int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
-{
- struct request_queue *q;
- int ret, start = 0;
- char b[BDEVNAME_SIZE];
-
- q = bdev_get_queue(bdev);
- if (!q)
- return -ENXIO;
-
- mutex_lock(&bdev->bd_mutex);
-
- switch (cmd) {
- case BLKTRACESETUP:
- bdevname(bdev, b);
- ret = blk_trace_setup(q, b, bdev->bd_dev, arg);
- break;
- case BLKTRACESTART:
- start = 1;
- case BLKTRACESTOP:
- ret = blk_trace_startstop(q, start);
- break;
- case BLKTRACETEARDOWN:
- ret = blk_trace_remove(q);
- break;
- default:
- ret = -ENOTTY;
- break;
- }
-
- mutex_unlock(&bdev->bd_mutex);
- return ret;
-}
-
-/**
- * blk_trace_shutdown: - stop and cleanup trace structures
- * @q: the request queue associated with the device
- *
- **/
-void blk_trace_shutdown(struct request_queue *q)
-{
- if (q->blk_trace) {
- blk_trace_startstop(q, 0);
- blk_trace_remove(q);
- }
-}
-
-/*
- * blktrace probes
- */
-
-/**
- * blk_add_trace_rq - Add a trace for a request oriented action
- * @q: queue the io is for
- * @rq: the source request
- * @what: the action
- *
- * Description:
- * Records an action against a request. Will log the bio offset + size.
- *
- **/
-static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
- u32 what)
-{
- struct blk_trace *bt = q->blk_trace;
- int rw = rq->cmd_flags & 0x03;
-
- if (likely(!bt))
- return;
-
- if (blk_discard_rq(rq))
- rw |= (1 << BIO_RW_DISCARD);
-
- if (blk_pc_request(rq)) {
- what |= BLK_TC_ACT(BLK_TC_PC);
- __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors,
- sizeof(rq->cmd), rq->cmd);
- } else {
- what |= BLK_TC_ACT(BLK_TC_FS);
- __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
- rw, what, rq->errors, 0, NULL);
- }
-}
-
-static void blk_add_trace_rq_abort(struct request_queue *q, struct request *rq)
-{
- blk_add_trace_rq(q, rq, BLK_TA_ABORT);
-}
-
-static void blk_add_trace_rq_insert(struct request_queue *q, struct request *rq)
-{
- blk_add_trace_rq(q, rq, BLK_TA_INSERT);
-}
-
-static void blk_add_trace_rq_issue(struct request_queue *q, struct request *rq)
-{
- blk_add_trace_rq(q, rq, BLK_TA_ISSUE);
-}
-
-static void blk_add_trace_rq_requeue(struct request_queue *q, struct request *rq)
-{
- blk_add_trace_rq(q, rq, BLK_TA_REQUEUE);
-}
-
-static void blk_add_trace_rq_complete(struct request_queue *q, struct request *rq)
-{
- blk_add_trace_rq(q, rq, BLK_TA_COMPLETE);
-}
-
-/**
- * blk_add_trace_bio - Add a trace for a bio oriented action
- * @q: queue the io is for
- * @bio: the source bio
- * @what: the action
- *
- * Description:
- * Records an action against a bio. Will log the bio offset + size.
- *
- **/
-static void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
- u32 what)
-{
- struct blk_trace *bt = q->blk_trace;
-
- if (likely(!bt))
- return;
-
- __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what,
- !bio_flagged(bio, BIO_UPTODATE), 0, NULL);
-}
-
-static void blk_add_trace_bio_bounce(struct request_queue *q, struct bio *bio)
-{
- blk_add_trace_bio(q, bio, BLK_TA_BOUNCE);
-}
-
-static void blk_add_trace_bio_complete(struct request_queue *q, struct bio *bio)
-{
- blk_add_trace_bio(q, bio, BLK_TA_COMPLETE);
-}
-
-static void blk_add_trace_bio_backmerge(struct request_queue *q, struct bio *bio)
-{
- blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE);
-}
-
-static void blk_add_trace_bio_frontmerge(struct request_queue *q, struct bio *bio)
-{
- blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE);
-}
-
-static void blk_add_trace_bio_queue(struct request_queue *q, struct bio *bio)
-{
- blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
-}
-
-static void blk_add_trace_getrq(struct request_queue *q, struct bio *bio, int rw)
-{
- if (bio)
- blk_add_trace_bio(q, bio, BLK_TA_GETRQ);
- else {
- struct blk_trace *bt = q->blk_trace;
-
- if (bt)
- __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL);
- }
-}
-
-
-static void blk_add_trace_sleeprq(struct request_queue *q, struct bio *bio, int rw)
-{
- if (bio)
- blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ);
- else {
- struct blk_trace *bt = q->blk_trace;
-
- if (bt)
- __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ, 0, 0, NULL);
- }
-}
-
-static void blk_add_trace_plug(struct request_queue *q)
-{
- struct blk_trace *bt = q->blk_trace;
-
- if (bt)
- __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL);
-}
-
-static void blk_add_trace_unplug_io(struct request_queue *q)
-{
- struct blk_trace *bt = q->blk_trace;
-
- if (bt) {
- unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE];
- __be64 rpdu = cpu_to_be64(pdu);
-
- __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_IO, 0,
- sizeof(rpdu), &rpdu);
- }
-}
-
-static void blk_add_trace_unplug_timer(struct request_queue *q)
-{
- struct blk_trace *bt = q->blk_trace;
-
- if (bt) {
- unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE];
- __be64 rpdu = cpu_to_be64(pdu);
-
- __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_TIMER, 0,
- sizeof(rpdu), &rpdu);
- }
-}
-
-static void blk_add_trace_split(struct request_queue *q, struct bio *bio,
- unsigned int pdu)
-{
- struct blk_trace *bt = q->blk_trace;
-
- if (bt) {
- __be64 rpdu = cpu_to_be64(pdu);
-
- __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw,
- BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE),
- sizeof(rpdu), &rpdu);
- }
-}
-
-/**
- * blk_add_trace_remap - Add a trace for a remap operation
- * @q: queue the io is for
- * @bio: the source bio
- * @dev: target device
- * @from: source sector
- * @to: target sector
- *
- * Description:
- * Device mapper or raid target sometimes need to split a bio because
- * it spans a stripe (or similar). Add a trace for that action.
- *
- **/
-static void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
- dev_t dev, sector_t from, sector_t to)
-{
- struct blk_trace *bt = q->blk_trace;
- struct blk_io_trace_remap r;
-
- if (likely(!bt))
- return;
-
- r.device = cpu_to_be32(dev);
- r.device_from = cpu_to_be32(bio->bi_bdev->bd_dev);
- r.sector = cpu_to_be64(to);
-
- __blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP,
- !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);
-}
-
-/**
- * blk_add_driver_data - Add binary message with driver-specific data
- * @q: queue the io is for
- * @rq: io request
- * @data: driver-specific data
- * @len: length of driver-specific data
- *
- * Description:
- * Some drivers might want to write driver-specific data per request.
- *
- **/
-void blk_add_driver_data(struct request_queue *q,
- struct request *rq,
- void *data, size_t len)
-{
- struct blk_trace *bt = q->blk_trace;
-
- if (likely(!bt))
- return;
-
- if (blk_pc_request(rq))
- __blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA,
- rq->errors, len, data);
- else
- __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
- 0, BLK_TA_DRV_DATA, rq->errors, len, data);
-}
-EXPORT_SYMBOL_GPL(blk_add_driver_data);
-
-static int blk_register_tracepoints(void)
-{
- int ret;
-
- ret = register_trace_block_rq_abort(blk_add_trace_rq_abort);
- WARN_ON(ret);
- ret = register_trace_block_rq_insert(blk_add_trace_rq_insert);
- WARN_ON(ret);
- ret = register_trace_block_rq_issue(blk_add_trace_rq_issue);
- WARN_ON(ret);
- ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue);
- WARN_ON(ret);
- ret = register_trace_block_rq_complete(blk_add_trace_rq_complete);
- WARN_ON(ret);
- ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce);
- WARN_ON(ret);
- ret = register_trace_block_bio_complete(blk_add_trace_bio_complete);
- WARN_ON(ret);
- ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge);
- WARN_ON(ret);
- ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge);
- WARN_ON(ret);
- ret = register_trace_block_bio_queue(blk_add_trace_bio_queue);
- WARN_ON(ret);
- ret = register_trace_block_getrq(blk_add_trace_getrq);
- WARN_ON(ret);
- ret = register_trace_block_sleeprq(blk_add_trace_sleeprq);
- WARN_ON(ret);
- ret = register_trace_block_plug(blk_add_trace_plug);
- WARN_ON(ret);
- ret = register_trace_block_unplug_timer(blk_add_trace_unplug_timer);
- WARN_ON(ret);
- ret = register_trace_block_unplug_io(blk_add_trace_unplug_io);
- WARN_ON(ret);
- ret = register_trace_block_split(blk_add_trace_split);
- WARN_ON(ret);
- ret = register_trace_block_remap(blk_add_trace_remap);
- WARN_ON(ret);
- return 0;
-}
-
-static void blk_unregister_tracepoints(void)
-{
- unregister_trace_block_remap(blk_add_trace_remap);
- unregister_trace_block_split(blk_add_trace_split);
- unregister_trace_block_unplug_io(blk_add_trace_unplug_io);
- unregister_trace_block_unplug_timer(blk_add_trace_unplug_timer);
- unregister_trace_block_plug(blk_add_trace_plug);
- unregister_trace_block_sleeprq(blk_add_trace_sleeprq);
- unregister_trace_block_getrq(blk_add_trace_getrq);
- unregister_trace_block_bio_queue(blk_add_trace_bio_queue);
- unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge);
- unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge);
- unregister_trace_block_bio_complete(blk_add_trace_bio_complete);
- unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce);
- unregister_trace_block_rq_complete(blk_add_trace_rq_complete);
- unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue);
- unregister_trace_block_rq_issue(blk_add_trace_rq_issue);
- unregister_trace_block_rq_insert(blk_add_trace_rq_insert);
- unregister_trace_block_rq_abort(blk_add_trace_rq_abort);
-
- tracepoint_synchronize_unregister();
-}