drivers/scsi/scsi_debugfs.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/bitops.h>
0003 #include <linux/seq_file.h>
0004 #include <scsi/scsi_cmnd.h>
0005 #include <scsi/scsi_dbg.h>
0006 #include "scsi_debugfs.h"
0007
0008 #define SCSI_CMD_FLAG_NAME(name)[const_ilog2(SCMD_##name)] = #name
0009 static const char *const scsi_cmd_flags[] = {
0010     SCSI_CMD_FLAG_NAME(TAGGED),
0011     SCSI_CMD_FLAG_NAME(INITIALIZED),
0012     SCSI_CMD_FLAG_NAME(LAST),
0013 };
0014 #undef SCSI_CMD_FLAG_NAME
0015
0016 static int scsi_flags_show(struct seq_file *m, const unsigned long flags,
0017                const char *const *flag_name, int flag_name_count)
0018 {
0019     bool sep = false;
0020     int i;
0021
0022     for_each_set_bit(i, &flags, BITS_PER_LONG) {
0023         if (sep)
0024             seq_puts(m, "|");
0025         sep = true;
0026         if (i < flag_name_count && flag_name[i])
0027             seq_puts(m, flag_name[i]);
0028         else
0029             seq_printf(m, "%d", i);
0030     }
0031     return 0;
0032 }
0033
0034 void scsi_show_rq(struct seq_file *m, struct request *rq)
0035 {
0036     struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
0037     int alloc_ms = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc);
0038     int timeout_ms = jiffies_to_msecs(rq->timeout);
0039     char buf[80] = "(?)";
0040
0041     __scsi_format_command(buf, sizeof(buf), cmd->cmnd, cmd->cmd_len);
0042     seq_printf(m, ", .cmd=%s, .retries=%d, .result = %#x, .flags=", buf,
0043            cmd->retries, cmd->result);
0044     scsi_flags_show(m, cmd->flags, scsi_cmd_flags,
0045             ARRAY_SIZE(scsi_cmd_flags));
0046     seq_printf(m, ", .timeout=%d.%03d, allocated %d.%03d s ago",
0047            timeout_ms / 1000, timeout_ms % 1000,
0048            alloc_ms / 1000, alloc_ms % 1000);
0049 }