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linux-stable/include/trace/events/block.h
Yang Shi d5869fdc18 block: introduce block_rq_error tracepoint 
Currently, rasdaemon uses the existing tracepoint block_rq_complete
and filters out non-error cases in order to capture block disk errors.

But there are a few problems with this approach:

1. Even kernel trace filter could do the filtering work, there is
   still some overhead after we enable this tracepoint.

2. The filter is merely based on errno, which does not align with kernel
   logic to check the errors for print_req_error().

3. block_rq_complete only provides dev major and minor to identify
   the block device, it is not convenient to use in user-space.

So introduce a new tracepoint block_rq_error just for the error case.
With this patch, rasdaemon could switch to block_rq_error.

Since the new tracepoint has the similar implementation with
block_rq_complete, so move the existing code from TRACE_EVENT
block_rq_complete() into new event class block_rq_completion(). Then add
event for block_rq_complete and block_rq_err respectively from the newly
created event class per the suggestion from Chaitanya Kulkarni.

Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220210225222.260069-1-shy828301@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-02-11 10:00:16 -07:00

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/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM block
#if !defined(_TRACE_BLOCK_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_BLOCK_H
#include <linux/blktrace_api.h>
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/tracepoint.h>
#define RWBS_LEN 8
DECLARE_EVENT_CLASS(block_buffer,
TP_PROTO(struct buffer_head *bh),
TP_ARGS(bh),
TP_STRUCT__entry (
__field( dev_t, dev )
__field( sector_t, sector )
__field( size_t, size )
),
TP_fast_assign(
__entry->dev = bh->b_bdev->bd_dev;
__entry->sector = bh->b_blocknr;
__entry->size = bh->b_size;
),
TP_printk("%d,%d sector=%llu size=%zu",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long long)__entry->sector, __entry->size
)
);
/**
* block_touch_buffer - mark a buffer accessed
* @bh: buffer_head being touched
*
* Called from touch_buffer().
*/
DEFINE_EVENT(block_buffer, block_touch_buffer,
TP_PROTO(struct buffer_head *bh),
TP_ARGS(bh)
);
/**
* block_dirty_buffer - mark a buffer dirty
* @bh: buffer_head being dirtied
*
* Called from mark_buffer_dirty().
*/
DEFINE_EVENT(block_buffer, block_dirty_buffer,
TP_PROTO(struct buffer_head *bh),
TP_ARGS(bh)
);
/**
* block_rq_requeue - place block IO request back on a queue
* @rq: block IO operation request
*
* The block operation request @rq is being placed back into queue
* @q. For some reason the request was not completed and needs to be
* put back in the queue.
*/
TRACE_EVENT(block_rq_requeue,
TP_PROTO(struct request *rq),
TP_ARGS(rq),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( sector_t, sector )
__field( unsigned int, nr_sector )
__array( char, rwbs, RWBS_LEN )
__dynamic_array( char, cmd, 1 )
),
TP_fast_assign(
__entry->dev = rq->q->disk ? disk_devt(rq->q->disk) : 0;
__entry->sector = blk_rq_trace_sector(rq);
__entry->nr_sector = blk_rq_trace_nr_sectors(rq);
blk_fill_rwbs(__entry->rwbs, rq->cmd_flags);
__get_str(cmd)[0] = '\0';
),
TP_printk("%d,%d %s (%s) %llu + %u [%d]",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->rwbs, __get_str(cmd),
(unsigned long long)__entry->sector,
__entry->nr_sector, 0)
);
DECLARE_EVENT_CLASS(block_rq_completion,
TP_PROTO(struct request *rq, blk_status_t error, unsigned int nr_bytes),
TP_ARGS(rq, error, nr_bytes),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( sector_t, sector )
__field( unsigned int, nr_sector )
__field( int , error )
__array( char, rwbs, RWBS_LEN )
__dynamic_array( char, cmd, 1 )
),
TP_fast_assign(
__entry->dev = rq->q->disk ? disk_devt(rq->q->disk) : 0;
__entry->sector = blk_rq_pos(rq);
__entry->nr_sector = nr_bytes >> 9;
__entry->error = blk_status_to_errno(error);
blk_fill_rwbs(__entry->rwbs, rq->cmd_flags);
__get_str(cmd)[0] = '\0';
),
TP_printk("%d,%d %s (%s) %llu + %u [%d]",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->rwbs, __get_str(cmd),
(unsigned long long)__entry->sector,
__entry->nr_sector, __entry->error)
);
/**
* block_rq_complete - block IO operation completed by device driver
* @rq: block operations request
* @error: status code
* @nr_bytes: number of completed bytes
*
* The block_rq_complete tracepoint event indicates that some portion
* of operation request has been completed by the device driver. If
* the @rq->bio is %NULL, then there is absolutely no additional work to
* do for the request. If @rq->bio is non-NULL then there is
* additional work required to complete the request.
*/
DEFINE_EVENT(block_rq_completion, block_rq_complete,
TP_PROTO(struct request *rq, blk_status_t error, unsigned int nr_bytes),
TP_ARGS(rq, error, nr_bytes)
);
/**
* block_rq_error - block IO operation error reported by device driver
* @rq: block operations request
* @error: status code
* @nr_bytes: number of completed bytes
*
* The block_rq_error tracepoint event indicates that some portion
* of operation request has failed as reported by the device driver.
*/
DEFINE_EVENT(block_rq_completion, block_rq_error,
TP_PROTO(struct request *rq, blk_status_t error, unsigned int nr_bytes),
TP_ARGS(rq, error, nr_bytes)
);
DECLARE_EVENT_CLASS(block_rq,
TP_PROTO(struct request *rq),
TP_ARGS(rq),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( sector_t, sector )
__field( unsigned int, nr_sector )
__field( unsigned int, bytes )
__array( char, rwbs, RWBS_LEN )
__array( char, comm, TASK_COMM_LEN )
__dynamic_array( char, cmd, 1 )
),
TP_fast_assign(
__entry->dev = rq->q->disk ? disk_devt(rq->q->disk) : 0;
__entry->sector = blk_rq_trace_sector(rq);
__entry->nr_sector = blk_rq_trace_nr_sectors(rq);
__entry->bytes = blk_rq_bytes(rq);
blk_fill_rwbs(__entry->rwbs, rq->cmd_flags);
__get_str(cmd)[0] = '\0';
memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
),
TP_printk("%d,%d %s %u (%s) %llu + %u [%s]",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->rwbs, __entry->bytes, __get_str(cmd),
(unsigned long long)__entry->sector,
__entry->nr_sector, __entry->comm)
);
/**
* block_rq_insert - insert block operation request into queue
* @rq: block IO operation request
*
* Called immediately before block operation request @rq is inserted
* into queue @q. The fields in the operation request @rq struct can
* be examined to determine which device and sectors the pending
* operation would access.
*/
DEFINE_EVENT(block_rq, block_rq_insert,
TP_PROTO(struct request *rq),
TP_ARGS(rq)
);
/**
* block_rq_issue - issue pending block IO request operation to device driver
* @rq: block IO operation request
*
* Called when block operation request @rq from queue @q is sent to a
* device driver for processing.
*/
DEFINE_EVENT(block_rq, block_rq_issue,
TP_PROTO(struct request *rq),
TP_ARGS(rq)
);
/**
* block_rq_merge - merge request with another one in the elevator
* @rq: block IO operation request
*
* Called when block operation request @rq from queue @q is merged to another
* request queued in the elevator.
*/
DEFINE_EVENT(block_rq, block_rq_merge,
TP_PROTO(struct request *rq),
TP_ARGS(rq)
);
/**
* block_bio_complete - completed all work on the block operation
* @q: queue holding the block operation
* @bio: block operation completed
*
* This tracepoint indicates there is no further work to do on this
* block IO operation @bio.
*/
TRACE_EVENT(block_bio_complete,
TP_PROTO(struct request_queue *q, struct bio *bio),
TP_ARGS(q, bio),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( sector_t, sector )
__field( unsigned, nr_sector )
__field( int, error )
__array( char, rwbs, RWBS_LEN)
),
TP_fast_assign(
__entry->dev = bio_dev(bio);
__entry->sector = bio->bi_iter.bi_sector;
__entry->nr_sector = bio_sectors(bio);
__entry->error = blk_status_to_errno(bio->bi_status);
blk_fill_rwbs(__entry->rwbs, bio->bi_opf);
),
TP_printk("%d,%d %s %llu + %u [%d]",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
(unsigned long long)__entry->sector,
__entry->nr_sector, __entry->error)
);
DECLARE_EVENT_CLASS(block_bio,
TP_PROTO(struct bio *bio),
TP_ARGS(bio),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( sector_t, sector )
__field( unsigned int, nr_sector )
__array( char, rwbs, RWBS_LEN )
__array( char, comm, TASK_COMM_LEN )
),
TP_fast_assign(
__entry->dev = bio_dev(bio);
__entry->sector = bio->bi_iter.bi_sector;
__entry->nr_sector = bio_sectors(bio);
blk_fill_rwbs(__entry->rwbs, bio->bi_opf);
memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
),
TP_printk("%d,%d %s %llu + %u [%s]",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
(unsigned long long)__entry->sector,
__entry->nr_sector, __entry->comm)
);
/**
* block_bio_bounce - used bounce buffer when processing block operation
* @bio: block operation
*
* A bounce buffer was used to handle the block operation @bio in @q.
* This occurs when hardware limitations prevent a direct transfer of
* data between the @bio data memory area and the IO device. Use of a
* bounce buffer requires extra copying of data and decreases
* performance.
*/
DEFINE_EVENT(block_bio, block_bio_bounce,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
/**
* block_bio_backmerge - merging block operation to the end of an existing operation
* @bio: new block operation to merge
*
* Merging block request @bio to the end of an existing block request.
*/
DEFINE_EVENT(block_bio, block_bio_backmerge,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
/**
* block_bio_frontmerge - merging block operation to the beginning of an existing operation
* @bio: new block operation to merge
*
* Merging block IO operation @bio to the beginning of an existing block request.
*/
DEFINE_EVENT(block_bio, block_bio_frontmerge,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
/**
* block_bio_queue - putting new block IO operation in queue
* @bio: new block operation
*
* About to place the block IO operation @bio into queue @q.
*/
DEFINE_EVENT(block_bio, block_bio_queue,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
/**
* block_getrq - get a free request entry in queue for block IO operations
* @bio: pending block IO operation (can be %NULL)
*
* A request struct has been allocated to handle the block IO operation @bio.
*/
DEFINE_EVENT(block_bio, block_getrq,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
/**
* block_plug - keep operations requests in request queue
* @q: request queue to plug
*
* Plug the request queue @q. Do not allow block operation requests
* to be sent to the device driver. Instead, accumulate requests in
* the queue to improve throughput performance of the block device.
*/
TRACE_EVENT(block_plug,
TP_PROTO(struct request_queue *q),
TP_ARGS(q),
TP_STRUCT__entry(
__array( char, comm, TASK_COMM_LEN )
),
TP_fast_assign(
memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
),
TP_printk("[%s]", __entry->comm)
);
DECLARE_EVENT_CLASS(block_unplug,
TP_PROTO(struct request_queue *q, unsigned int depth, bool explicit),
TP_ARGS(q, depth, explicit),
TP_STRUCT__entry(
__field( int, nr_rq )
__array( char, comm, TASK_COMM_LEN )
),
TP_fast_assign(
__entry->nr_rq = depth;
memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
),
TP_printk("[%s] %d", __entry->comm, __entry->nr_rq)
);
/**
* block_unplug - release of operations requests in request queue
* @q: request queue to unplug
* @depth: number of requests just added to the queue
* @explicit: whether this was an explicit unplug, or one from schedule()
*
* Unplug request queue @q because device driver is scheduled to work
* on elements in the request queue.
*/
DEFINE_EVENT(block_unplug, block_unplug,
TP_PROTO(struct request_queue *q, unsigned int depth, bool explicit),
TP_ARGS(q, depth, explicit)
);
/**
* block_split - split a single bio struct into two bio structs
* @bio: block operation being split
* @new_sector: The starting sector for the new bio
*
* The bio request @bio needs to be split into two bio requests. The newly
* created @bio request starts at @new_sector. This split may be required due to
* hardware limitations such as operation crossing device boundaries in a RAID
* system.
*/
TRACE_EVENT(block_split,
TP_PROTO(struct bio *bio, unsigned int new_sector),
TP_ARGS(bio, new_sector),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( sector_t, sector )
__field( sector_t, new_sector )
__array( char, rwbs, RWBS_LEN )
__array( char, comm, TASK_COMM_LEN )
),
TP_fast_assign(
__entry->dev = bio_dev(bio);
__entry->sector = bio->bi_iter.bi_sector;
__entry->new_sector = new_sector;
blk_fill_rwbs(__entry->rwbs, bio->bi_opf);
memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
),
TP_printk("%d,%d %s %llu / %llu [%s]",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
(unsigned long long)__entry->sector,
(unsigned long long)__entry->new_sector,
__entry->comm)
);
/**
* block_bio_remap - map request for a logical device to the raw device
* @bio: revised operation
* @dev: original device for the operation
* @from: original sector for the operation
*
* An operation for a logical device has been mapped to the
* raw block device.
*/
TRACE_EVENT(block_bio_remap,
TP_PROTO(struct bio *bio, dev_t dev, sector_t from),
TP_ARGS(bio, dev, from),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( sector_t, sector )
__field( unsigned int, nr_sector )
__field( dev_t, old_dev )
__field( sector_t, old_sector )
__array( char, rwbs, RWBS_LEN)
),
TP_fast_assign(
__entry->dev = bio_dev(bio);
__entry->sector = bio->bi_iter.bi_sector;
__entry->nr_sector = bio_sectors(bio);
__entry->old_dev = dev;
__entry->old_sector = from;
blk_fill_rwbs(__entry->rwbs, bio->bi_opf);
),
TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
(unsigned long long)__entry->sector,
__entry->nr_sector,
MAJOR(__entry->old_dev), MINOR(__entry->old_dev),
(unsigned long long)__entry->old_sector)
);
/**
* block_rq_remap - map request for a block operation request
* @rq: block IO operation request
* @dev: device for the operation
* @from: original sector for the operation
*
* The block operation request @rq in @q has been remapped. The block
* operation request @rq holds the current information and @from hold
* the original sector.
*/
TRACE_EVENT(block_rq_remap,
TP_PROTO(struct request *rq, dev_t dev, sector_t from),
TP_ARGS(rq, dev, from),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( sector_t, sector )
__field( unsigned int, nr_sector )
__field( dev_t, old_dev )
__field( sector_t, old_sector )
__field( unsigned int, nr_bios )
__array( char, rwbs, RWBS_LEN)
),
TP_fast_assign(
__entry->dev = disk_devt(rq->q->disk);
__entry->sector = blk_rq_pos(rq);
__entry->nr_sector = blk_rq_sectors(rq);
__entry->old_dev = dev;
__entry->old_sector = from;
__entry->nr_bios = blk_rq_count_bios(rq);
blk_fill_rwbs(__entry->rwbs, rq->cmd_flags);
),
TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu %u",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
(unsigned long long)__entry->sector,
__entry->nr_sector,
MAJOR(__entry->old_dev), MINOR(__entry->old_dev),
(unsigned long long)__entry->old_sector, __entry->nr_bios)
);
#endif /* _TRACE_BLOCK_H */
/* This part must be outside protection */
#include <trace/define_trace.h>
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