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@xxxxxxxxxxx>
Reviewed-by: Omar Sandoval <osandov@xxxxxx>
Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: <linux-scsi@xxxxxxxxxxxxxxx>
---
drivers/scsi/Makefile | 1 +
drivers/scsi/scsi_debugfs.c | 13 +++++++++++++
drivers/scsi/scsi_debugfs.h | 4 ++++
drivers/scsi/scsi_lib.c | 4 ++++
4 files changed, 22 insertions(+)
create mode 100644 drivers/scsi/scsi_debugfs.c
create mode 100644 drivers/scsi/scsi_debugfs.h
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index fc2855565a51..93dbe58c47c8 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -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_SYSCTL) += scsi_sysctl.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-$(CONFIG_PM) += scsi_pm.o
scsi_mod-$(CONFIG_SCSI_DH) += scsi_dh.o
diff --git a/drivers/scsi/scsi_debugfs.c b/drivers/scsi/scsi_debugfs.c
new file mode 100644
index 000000000000..a97c9507103d
--- /dev/null
+++ b/drivers/scsi/scsi_debugfs.c
@@ -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);
+}
diff --git a/drivers/scsi/scsi_debugfs.h b/drivers/scsi/scsi_debugfs.h
new file mode 100644
index 000000000000..951b043e82d0
--- /dev/null
+++ b/drivers/scsi/scsi_debugfs.h
@@ -0,0 +1,4 @@
+struct request;
+struct seq_file;
+
+void scsi_show_rq(struct seq_file *m, struct request *rq);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index abc391e00f7d..1c3e87d6c48f 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -34,6 +34,7 @@
#include <trace/events/scsi.h>
+#include "scsi_debugfs.h"
#include "scsi_priv.h"
#include "scsi_logging.h"
@@ -2157,6 +2158,9 @@ static const struct blk_mq_ops scsi_mq_ops = {
.queue_rq = scsi_queue_rq,
.complete = scsi_softirq_done,
.timeout = scsi_timeout,
+#ifdef CONFIG_BLK_DEBUG_FS
+ .show_rq = scsi_show_rq,
+#endif
.init_request = scsi_init_request,
.exit_request = scsi_exit_request,
.map_queues = scsi_map_queues,
--
2.12.2
