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scsi: Implement blk_mq_ops.show_rq()
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>
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4 changed files with 22 additions and 0 deletions
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@ -166,6 +166,7 @@ scsi_mod-y += scsi_scan.o scsi_sysfs.o scsi_devinfo.o
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scsi_mod-$(CONFIG_SCSI_NETLINK) += scsi_netlink.o
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scsi_mod-$(CONFIG_SYSCTL) += scsi_sysctl.o
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scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_proc.o
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scsi_mod-$(CONFIG_BLK_DEBUG_FS) += scsi_debugfs.o
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scsi_mod-y += scsi_trace.o scsi_logging.o
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scsi_mod-$(CONFIG_PM) += scsi_pm.o
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scsi_mod-$(CONFIG_SCSI_DH) += scsi_dh.o
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13
drivers/scsi/scsi_debugfs.c
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13
drivers/scsi/scsi_debugfs.c
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@ -0,0 +1,13 @@
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#include <linux/seq_file.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_dbg.h>
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#include "scsi_debugfs.h"
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void scsi_show_rq(struct seq_file *m, struct request *rq)
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{
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struct scsi_cmnd *cmd = container_of(scsi_req(rq), typeof(*cmd), req);
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char buf[80];
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__scsi_format_command(buf, sizeof(buf), cmd->cmnd, cmd->cmd_len);
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seq_printf(m, ", .cmd=%s", buf);
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}
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4
drivers/scsi/scsi_debugfs.h
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4
drivers/scsi/scsi_debugfs.h
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@ -0,0 +1,4 @@
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struct request;
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struct seq_file;
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void scsi_show_rq(struct seq_file *m, struct request *rq);
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@ -34,6 +34,7 @@
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#include <trace/events/scsi.h>
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#include "scsi_debugfs.h"
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#include "scsi_priv.h"
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#include "scsi_logging.h"
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@ -2157,6 +2158,9 @@ static const struct blk_mq_ops scsi_mq_ops = {
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.queue_rq = scsi_queue_rq,
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.complete = scsi_softirq_done,
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.timeout = scsi_timeout,
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#ifdef CONFIG_BLK_DEBUG_FS
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.show_rq = scsi_show_rq,
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#endif
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.init_request = scsi_init_request,
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.exit_request = scsi_exit_request,
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.map_queues = scsi_map_queues,
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