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
11static 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
18static 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
36static 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
54void 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}