1#ifndef _SCSI_SCSI_TCQ_H
2#define _SCSI_SCSI_TCQ_H
3
4#include <linux/blkdev.h>
5#include <scsi/scsi_cmnd.h>
6#include <scsi/scsi_device.h>
7#include <scsi/scsi_host.h>
8
9#define MSG_SIMPLE_TAG 0x20
10#define MSG_HEAD_TAG 0x21
11#define MSG_ORDERED_TAG 0x22
12#define MSG_ACA_TAG 0x24
13
14#define SCSI_NO_TAG (-1)
15
16
17#ifdef CONFIG_BLOCK
18
19
20
21
22
23
24
25
26
27static inline int scsi_get_tag_type(struct scsi_device *sdev)
28{
29 if (!sdev->tagged_supported)
30 return 0;
31 if (sdev->ordered_tags)
32 return MSG_ORDERED_TAG;
33 if (sdev->simple_tags)
34 return MSG_SIMPLE_TAG;
35 return 0;
36}
37
38static inline void scsi_set_tag_type(struct scsi_device *sdev, int tag)
39{
40 switch (tag) {
41 case MSG_ORDERED_TAG:
42 sdev->ordered_tags = 1;
43
44 case MSG_SIMPLE_TAG:
45 sdev->simple_tags = 1;
46 break;
47 case 0:
48
49 default:
50 sdev->ordered_tags = 0;
51 sdev->simple_tags = 0;
52 break;
53 }
54}
55
56
57
58
59
60
61
62
63
64
65static inline void scsi_activate_tcq(struct scsi_device *sdev, int depth)
66{
67 if (!sdev->tagged_supported)
68 return;
69
70 if (!blk_queue_tagged(sdev->request_queue))
71 blk_queue_init_tags(sdev->request_queue, depth,
72 sdev->host->bqt);
73
74 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
75}
76
77
78
79
80
81static inline void scsi_deactivate_tcq(struct scsi_device *sdev, int depth)
82{
83 if (blk_queue_tagged(sdev->request_queue))
84 blk_queue_free_tags(sdev->request_queue);
85 scsi_adjust_queue_depth(sdev, 0, depth);
86}
87
88
89
90
91
92
93
94
95
96
97
98static inline int scsi_populate_tag_msg(struct scsi_cmnd *cmd, char *msg)
99{
100 struct request *req = cmd->request;
101
102 if (blk_rq_tagged(req)) {
103 *msg++ = MSG_SIMPLE_TAG;
104 *msg++ = req->tag;
105 return 2;
106 }
107
108 return 0;
109}
110
111
112
113
114
115
116
117
118
119static inline struct scsi_cmnd *scsi_find_tag(struct scsi_device *sdev, int tag)
120{
121
122 struct request *req;
123
124 if (tag != SCSI_NO_TAG) {
125 req = blk_queue_find_tag(sdev->request_queue, tag);
126 return req ? (struct scsi_cmnd *)req->special : NULL;
127 }
128
129
130 return sdev->current_cmnd;
131}
132
133
134
135
136
137
138static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)
139{
140
141
142
143
144
145 if (!shost->bqt) {
146 shost->bqt = blk_init_tags(depth);
147 if (!shost->bqt)
148 return -ENOMEM;
149 }
150
151 return 0;
152}
153
154
155
156
157
158
159
160
161
162static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost,
163 int tag)
164{
165 struct request *req;
166
167 if (tag != SCSI_NO_TAG) {
168 req = blk_map_queue_find_tag(shost->bqt, tag);
169 return req ? (struct scsi_cmnd *)req->special : NULL;
170 }
171 return NULL;
172}
173
174#endif
175#endif
176