text: // SPDX-License-Identifier: GPL-2.0
  #include <linux/seq_file.h>
  #include <scsi/scsi_cmnd.h>
  #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(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 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, .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);
  }
  