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2ee4e9ce59
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>
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#define SCSI_CMD_FLAG_NAME(name) [ilog2(SCMD_##name)] = #name
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static const char *const scsi_cmd_flags[] = {
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SCSI_CMD_FLAG_NAME(TAGGED),
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SCSI_CMD_FLAG_NAME(UNCHECKED_ISA_DMA),
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SCSI_CMD_FLAG_NAME(ZONE_WRITE_LOCK),
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SCSI_CMD_FLAG_NAME(INITIALIZED),
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};
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#undef SCSI_CMD_FLAG_NAME
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static int scsi_flags_show(struct seq_file *m, const unsigned long flags,
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const char *const *flag_name, int flag_name_count)
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{
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bool sep = false;
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int i;
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for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
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if (!(flags & BIT(i)))
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continue;
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if (sep)
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seq_puts(m, "|");
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sep = true;
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if (i < flag_name_count && flag_name[i])
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seq_puts(m, flag_name[i]);
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else
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seq_printf(m, "%d", i);
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}
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return 0;
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}
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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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int alloc_ms = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc);
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int timeout_ms = jiffies_to_msecs(rq->timeout);
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const u8 *const cdb = READ_ONCE(cmd->cmnd);
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char buf[80] = "(?)";
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if (cdb)
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__scsi_format_command(buf, sizeof(buf), cdb, cmd->cmd_len);
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seq_printf(m, ", .cmd=%s, .retries=%d, .result = %#x, .flags=", buf,
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cmd->retries, cmd->result);
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scsi_flags_show(m, cmd->flags, scsi_cmd_flags,
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ARRAY_SIZE(scsi_cmd_flags));
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seq_printf(m, ", .timeout=%d.%03d, allocated %d.%03d s ago",
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timeout_ms / 1000, timeout_ms % 1000,
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alloc_ms / 1000, alloc_ms % 1000);
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}
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