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scsi: scsi-mq-debugfs: Show more information 

Show the request result, request timeout and SCSI command flags.  This
information is very helpful when trying to figure out why a queue got
stuck. An example of the information that is exported through debugfs:

$ (cd /sys/kernel/debug/block && find -type f -print0 | xargs -0 grep ago)
./sda/hctx0/busy:ffff8804a4523300 {.op=READ, .cmd_flags=FAILFAST_DEV|FAILFAST_TRANSPORT|FAILFAST_DRIVER|RAHEAD, .rq_flags=MQ_INFLIGHT|DONTPREP|IO_STAT|STATS, .atomic_flags=STARTED, .tag=24, .internal_tag=-1, .cmd=Read(10) 28 00 06 80 1c c8 00 00 08 00, .retries=0, .result = 0x0, .flags=TAGGED|INITIALIZED, .timeout=90.000, allocated 0.010 s ago}

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: James E.J. Bottomley <jejb@linux.vnet.ibm.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2017-12-05 16:57:53 -08:00 committed by Martin K. Petersen
parent 550203e64c
commit 2ee4e9ce59
1 changed files with 38 additions and 3 deletions
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41
drivers/scsi/scsi_debugfs.c
View File

@ -4,15 +4,50 @@
#include <scsi/scsi_dbg.h>
#include "scsi_debugfs.h"
#define SCSI_CMD_FLAG_NAME(name) [ilog2(SCMD_##name)] = #name
static const char *const scsi_cmd_flags[] = {
SCSI_CMD_FLAG_NAME(TAGGED),
SCSI_CMD_FLAG_NAME(UNCHECKED_ISA_DMA),
SCSI_CMD_FLAG_NAME(ZONE_WRITE_LOCK),
SCSI_CMD_FLAG_NAME(INITIALIZED),
};
#undef SCSI_CMD_FLAG_NAME
static int scsi_flags_show(struct seq_file *m, const unsigned long flags,
const char *const *flag_name, int flag_name_count)
{
bool sep = false;
int i;
for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
if (!(flags & BIT(i)))
continue;
if (sep)
seq_puts(m, "|");
sep = true;
if (i < flag_name_count && flag_name[i])
seq_puts(m, flag_name[i]);
else
seq_printf(m, "%d", i);
}
return 0;
}
void scsi_show_rq(struct seq_file *m, struct request *rq)
{
struct scsi_cmnd *cmd = container_of(scsi_req(rq), typeof(*cmd), req);
int msecs = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc);
int alloc_ms = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc);
int timeout_ms = jiffies_to_msecs(rq->timeout);
const u8 *const cdb = READ_ONCE(cmd->cmnd);
char buf[80] = "(?)";
if (cdb)
__scsi_format_command(buf, sizeof(buf), cdb, cmd->cmd_len);
seq_printf(m, ", .cmd=%s, .retries=%d, allocated %d.%03d s ago", buf,
cmd->retries, msecs / 1000, msecs % 1000);
seq_printf(m, ", .cmd=%s, .retries=%d, .result = %#x, .flags=", buf,
cmd->retries, cmd->result);
scsi_flags_show(m, cmd->flags, scsi_cmd_flags,
ARRAY_SIZE(scsi_cmd_flags));
seq_printf(m, ", .timeout=%d.%03d, allocated %d.%03d s ago",
timeout_ms / 1000, timeout_ms % 1000,
alloc_ms / 1000, alloc_ms % 1000);
}