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scsi: Implement blk_mq_ops.show_rq()

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Show the SCSI CDB for pending SCSI commands in
/sys/kernel/debug/block/*/mq/*/dispatch and */rq_list. An example
of how SCSI commands are displayed by this code:

ffff8801703245c0 {.op=READ, .cmd_flags=META PRIO, .rq_flags=DONTPREP IO_STAT STATS, .tag=14, .internal_tag=-1, .cmd=Read(10) 28 00 2a 81 1b 30 00 00 08 00}

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: <linux-scsi@vger.kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Bart Van Assche 2017-04-26 13:47:57 -07:00 committed by Jens Axboe
parent 2836ee4b1a
commit 0eebd005dd
4 changed files with 22 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/scsi/Makefile
View file

@ -166,6 +166,7 @@ scsi_mod-y += scsi_scan.o scsi_sysfs.o scsi_devinfo.o
scsi_mod-$(CONFIG_SCSI_NETLINK) += scsi_netlink.o scsi_mod-$(CONFIG_SCSI_NETLINK) += scsi_netlink.o
scsi_mod-$(CONFIG_SYSCTL) += scsi_sysctl.o scsi_mod-$(CONFIG_SYSCTL) += scsi_sysctl.o
scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_proc.o scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_proc.o
scsi_mod-$(CONFIG_BLK_DEBUG_FS) += scsi_debugfs.o
scsi_mod-y += scsi_trace.o scsi_logging.o scsi_mod-y += scsi_trace.o scsi_logging.o
scsi_mod-$(CONFIG_PM) += scsi_pm.o scsi_mod-$(CONFIG_PM) += scsi_pm.o
scsi_mod-$(CONFIG_SCSI_DH) += scsi_dh.o scsi_mod-$(CONFIG_SCSI_DH) += scsi_dh.o

13
drivers/scsi/scsi_debugfs.c Normal file
View file

@ -0,0 +1,13 @@
#include <linux/seq_file.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include "scsi_debugfs.h"
void scsi_show_rq(struct seq_file *m, struct request *rq)
{
struct scsi_cmnd *cmd = container_of(scsi_req(rq), typeof(*cmd), req);
char buf[80];
__scsi_format_command(buf, sizeof(buf), cmd->cmnd, cmd->cmd_len);
seq_printf(m, ", .cmd=%s", buf);
}

4
drivers/scsi/scsi_debugfs.h Normal file
View file

@ -0,0 +1,4 @@
struct request;
struct seq_file;
void scsi_show_rq(struct seq_file *m, struct request *rq);

4
drivers/scsi/scsi_lib.c
View file

@ -34,6 +34,7 @@
#include <trace/events/scsi.h> #include <trace/events/scsi.h>
#include "scsi_debugfs.h"
#include "scsi_priv.h" #include "scsi_priv.h"
#include "scsi_logging.h" #include "scsi_logging.h"
@ -2157,6 +2158,9 @@ static const struct blk_mq_ops scsi_mq_ops = {
.queue_rq = scsi_queue_rq, .queue_rq = scsi_queue_rq,
.complete = scsi_softirq_done, .complete = scsi_softirq_done,
.timeout = scsi_timeout, .timeout = scsi_timeout,
#ifdef CONFIG_BLK_DEBUG_FS
.show_rq = scsi_show_rq,
#endif
.init_request = scsi_init_request, .init_request = scsi_init_request,
.exit_request = scsi_exit_request, .exit_request = scsi_exit_request,
.map_queues = scsi_map_queues, .map_queues = scsi_map_queues,