1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/*
* CAM request queue management definitions.
*
* Copyright (c) 1997 Justin T. Gibbs.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification, immediately at the beginning of the file.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _CAM_CAM_QUEUE_H
#define _CAM_CAM_QUEUE_H 1
#ifdef _KERNEL
#include <sys/queue.h>
/*
* This structure implements a heap based priority queue. The queue
* assumes that the objects stored in it begin with a cam_qentry
* structure holding the priority information used to sort the objects.
* This structure is opaque to clients (outside of the XPT layer) to allow
* the implementation to change without affecting them.
*/
struct camq {
cam_pinfo **queue_array;
int array_size;
int entries;
u_int32_t generation;
u_int32_t qfrozen_cnt;
};
TAILQ_HEAD(ccb_hdr_tailq, ccb_hdr);
LIST_HEAD(ccb_hdr_list, ccb_hdr);
SLIST_HEAD(ccb_hdr_slist, ccb_hdr);
struct cam_ccbq {
struct camq queue;
int devq_openings;
int dev_openings;
int dev_active;
int held;
struct ccb_hdr_tailq active_ccbs;
};
struct cam_ed;
struct cam_devq {
struct camq alloc_queue;
struct camq send_queue;
struct cam_ed *active_dev;
int alloc_openings;
int alloc_active;
int send_openings;
int send_active;
};
struct cam_devq *cam_devq_alloc(int devices, int openings);
int cam_devq_init(struct cam_devq *devq, int devices,
int openings);
void cam_devq_free(struct cam_devq *devq);
u_int32_t cam_devq_resize(struct cam_devq *camq, int openings);
/*
* Allocate a cam_ccb_queue structure and initialize it.
*/
struct cam_ccbq *cam_ccbq_alloc(int openings);
u_int32_t cam_ccbq_resize(struct cam_ccbq *ccbq, int devices);
int cam_ccbq_init(struct cam_ccbq *ccbq, int openings);
void cam_ccbq_free(struct cam_ccbq *ccbq);
void cam_ccbq_fini(struct cam_ccbq *ccbq);
/*
* Allocate and initialize a cam_queue structure.
*/
struct camq *camq_alloc(int size);
/*
* Resize a cam queue
*/
u_int32_t camq_resize(struct camq *queue, int new_size);
/*
* Initialize a camq structure. Return 0 on success, 1 on failure.
*/
int camq_init(struct camq *camq, int size);
/*
* Free a cam_queue structure. This should only be called if a controller
* driver failes somehow during its attach routine or is unloaded and has
* obtained a cam_queue structure.
*/
void camq_free(struct camq *queue);
/*
* Finialize any internal storage or state of a cam_queue.
*/
void camq_fini(struct camq *queue);
/*
* cam_queue_insert: Given a CAM queue with at least one open spot,
* insert the new entry maintaining order.
*/
void camq_insert(struct camq *queue, cam_pinfo *new_entry);
/*
* camq_remove: Remove and arbitrary entry from the queue maintaining
* queue order.
*/
cam_pinfo *camq_remove(struct camq *queue, int index);
#define CAMQ_HEAD 1 /* Head of queue index */
/* Index the first element in the heap */
#define CAMQ_GET_HEAD(camq) ((camq)->queue_array[CAMQ_HEAD])
/*
* camq_change_priority: Raise or lower the priority of an entry
* maintaining queue order.
*/
void camq_change_priority(struct camq *queue, int index,
u_int32_t new_priority);
static __inline int
cam_ccbq_pending_ccb_count(struct cam_ccbq *ccbq);
static __inline void
cam_ccbq_take_opening(struct cam_ccbq *ccbq);
static __inline void
cam_ccbq_insert_ccb(struct cam_ccbq *ccbq, union ccb *new_ccb);
static __inline void
cam_ccbq_remove_ccb(struct cam_ccbq *ccbq, union ccb *ccb);
static __inline union ccb *
cam_ccbq_peek_ccb(struct cam_ccbq *ccbq, int index);
static __inline void
cam_ccbq_send_ccb(struct cam_ccbq *queue, union ccb *send_ccb);
static __inline void
cam_ccbq_ccb_done(struct cam_ccbq *ccbq, union ccb *done_ccb);
static __inline void
cam_ccbq_release_opening(struct cam_ccbq *ccbq);
static __inline int
cam_ccbq_pending_ccb_count(struct cam_ccbq *ccbq)
{
return (ccbq->queue.entries);
}
static __inline void
cam_ccbq_take_opening(struct cam_ccbq *ccbq)
{
ccbq->devq_openings--;
ccbq->held++;
}
static __inline void
cam_ccbq_insert_ccb(struct cam_ccbq *ccbq, union ccb *new_ccb)
{
ccbq->held--;
camq_insert(&ccbq->queue, &new_ccb->ccb_h.pinfo);
}
static __inline void
cam_ccbq_remove_ccb(struct cam_ccbq *ccbq, union ccb *ccb)
{
camq_remove(&ccbq->queue, ccb->ccb_h.pinfo.index);
}
static __inline union ccb *
cam_ccbq_peek_ccb(struct cam_ccbq *ccbq, int index)
{
return((union ccb *)ccbq->queue.queue_array[index]);
}
static __inline void
cam_ccbq_send_ccb(struct cam_ccbq *ccbq, union ccb *send_ccb)
{
TAILQ_INSERT_TAIL(&ccbq->active_ccbs,
&(send_ccb->ccb_h),
xpt_links.tqe);
send_ccb->ccb_h.pinfo.index = CAM_ACTIVE_INDEX;
ccbq->dev_active++;
ccbq->dev_openings--;
}
static __inline void
cam_ccbq_ccb_done(struct cam_ccbq *ccbq, union ccb *done_ccb)
{
TAILQ_REMOVE(&ccbq->active_ccbs, &done_ccb->ccb_h,
xpt_links.tqe);
ccbq->dev_active--;
ccbq->dev_openings++;
ccbq->held++;
}
static __inline void
cam_ccbq_release_opening(struct cam_ccbq *ccbq)
{
ccbq->held--;
ccbq->devq_openings++;
}
#endif /* _KERNEL */
#endif /* _CAM_CAM_QUEUE_H */
|
