drivers/scsi/scsi_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/bitops.h>
   3 #include <linux/cleanup.h>
   4 #include <linux/seq_file.h>
   5 #include <scsi/scsi_cmnd.h>
   6 #include <scsi/scsi_dbg.h>
   7 #include <scsi/scsi_host.h>
   8 #include "scsi_debugfs.h"
   9
  10 #define SCSI_CMD_FLAG_NAME(name)[const_ilog2(SCMD_##name)] = #name
  11 static const char *const scsi_cmd_flags[] = {
  12         SCSI_CMD_FLAG_NAME(TAGGED),
  13         SCSI_CMD_FLAG_NAME(INITIALIZED),
  14         SCSI_CMD_FLAG_NAME(LAST),
  15 };
  16 #undef SCSI_CMD_FLAG_NAME
  17
  18 static int scsi_flags_show(struct seq_file *m, const unsigned long flags,
  19                            const char *const *flag_name, int flag_name_count)
  20 {
  21         bool sep = false;
  22         int i;
  23
  24         for_each_set_bit(i, &flags, BITS_PER_LONG) {
  25                 if (sep)
  26                         seq_puts(m, "|");
  27                 sep = true;
  28                 if (i < flag_name_count && flag_name[i])
  29                         seq_puts(m, flag_name[i]);
  30                 else
  31                         seq_printf(m, "%d", i);
  32         }
  33         return 0;
  34 }
  35
  36 static const char *scsi_cmd_list_info(struct scsi_cmnd *cmd)
  37 {
  38         struct Scsi_Host *shost = cmd->device->host;
  39         struct scsi_cmnd *cmd2;
  40
  41         guard(spinlock_irq)(shost->host_lock);
  42
  43         list_for_each_entry(cmd2, &shost->eh_abort_list, eh_entry)
  44                 if (cmd == cmd2)
  45                         return "on eh_abort_list";
  46
  47         list_for_each_entry(cmd2, &shost->eh_cmd_q, eh_entry)
  48                 if (cmd == cmd2)
  49                         return "on eh_cmd_q";
  50
  51         return NULL;
  52 }
  53
  54 void scsi_show_rq(struct seq_file *m, struct request *rq)
  55 {
  56         struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
  57         int alloc_ms = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc);
  58         int timeout_ms = jiffies_to_msecs(rq->timeout);
  59         char buf[80] = "(?)";
  60
  61         if (cmd->flags & SCMD_INITIALIZED) {
  62                 const char *list_info = scsi_cmd_list_info(cmd);
  63
  64                 __scsi_format_command(buf, sizeof(buf), cmd->cmnd, cmd->cmd_len);
  65                 seq_printf(m, ", .cmd=%s, .retries=%d, .allowed=%d, .result = %#x%s%s",
  66                            buf, cmd->retries, cmd->allowed, cmd->result,
  67                            list_info ? ", " : "", list_info ? : "");
  68                 seq_printf(m, ", .timeout=%d.%03d, allocated %d.%03d s ago",
  69                            timeout_ms / 1000, timeout_ms % 1000,
  70                            alloc_ms / 1000, alloc_ms % 1000);
  71         }
  72         seq_printf(m, ", .flags=");
  73         scsi_flags_show(m, cmd->flags, scsi_cmd_flags,
  74                         ARRAY_SIZE(scsi_cmd_flags));
  75 }