FreeBSD/Linux Kernel Cross Reference
sys/cam/cam_periph.h
1 /*-
2 * Data structures and definitions for CAM peripheral ("type") drivers.
3 *
4 * Copyright (c) 1997, 1998 Justin T. Gibbs.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions, and the following disclaimer,
12 * without modification, immediately at the beginning of the file.
13 * 2. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: releng/8.1/sys/cam/cam_periph.h 203889 2010-02-14 19:38:27Z mav $
29 */
30
31 #ifndef _CAM_CAM_PERIPH_H
32 #define _CAM_CAM_PERIPH_H 1
33
34 #include <sys/queue.h>
35 #include <cam/cam_sim.h>
36
37 #ifdef _KERNEL
38
39 struct devstat;
40
41 extern struct cam_periph *xpt_periph;
42
43 extern struct periph_driver **periph_drivers;
44 void periphdriver_register(void *);
45 void periphdriver_init(int level);
46
47 #include <sys/module.h>
48 #define PERIPHDRIVER_DECLARE(name, driver) \
49 static int name ## _modevent(module_t mod, int type, void *data) \
50 { \
51 switch (type) { \
52 case MOD_LOAD: \
53 periphdriver_register(data); \
54 break; \
55 case MOD_UNLOAD: \
56 printf(#name " module unload - not possible for this module type\n"); \
57 return EINVAL; \
58 default: \
59 return EOPNOTSUPP; \
60 } \
61 return 0; \
62 } \
63 static moduledata_t name ## _mod = { \
64 #name, \
65 name ## _modevent, \
66 (void *)&driver \
67 }; \
68 DECLARE_MODULE(name, name ## _mod, SI_SUB_DRIVERS, SI_ORDER_ANY); \
69 MODULE_DEPEND(name, cam, 1, 1, 1)
70
71 typedef void (periph_init_t)(void); /*
72 * Callback informing the peripheral driver
73 * it can perform it's initialization since
74 * the XPT is now fully initialized.
75 */
76 typedef periph_init_t *periph_init_func_t;
77
78 struct periph_driver {
79 periph_init_func_t init;
80 char *driver_name;
81 TAILQ_HEAD(,cam_periph) units;
82 u_int generation;
83 u_int flags;
84 #define CAM_PERIPH_DRV_EARLY 0x01
85 };
86
87 typedef enum {
88 CAM_PERIPH_BIO
89 } cam_periph_type;
90
91 /* Generically usefull offsets into the peripheral private area */
92 #define ppriv_ptr0 periph_priv.entries[0].ptr
93 #define ppriv_ptr1 periph_priv.entries[1].ptr
94 #define ppriv_field0 periph_priv.entries[0].field
95 #define ppriv_field1 periph_priv.entries[1].field
96
97 typedef void periph_start_t (struct cam_periph *periph,
98 union ccb *start_ccb);
99 typedef cam_status periph_ctor_t (struct cam_periph *periph,
100 void *arg);
101 typedef void periph_oninv_t (struct cam_periph *periph);
102 typedef void periph_dtor_t (struct cam_periph *periph);
103 struct cam_periph {
104 cam_pinfo pinfo;
105 periph_start_t *periph_start;
106 periph_oninv_t *periph_oninval;
107 periph_dtor_t *periph_dtor;
108 char *periph_name;
109 struct cam_path *path; /* Compiled path to device */
110 void *softc;
111 struct cam_sim *sim;
112 u_int32_t unit_number;
113 cam_periph_type type;
114 u_int32_t flags;
115 #define CAM_PERIPH_RUNNING 0x01
116 #define CAM_PERIPH_LOCKED 0x02
117 #define CAM_PERIPH_LOCK_WANTED 0x04
118 #define CAM_PERIPH_INVALID 0x08
119 #define CAM_PERIPH_NEW_DEV_FOUND 0x10
120 #define CAM_PERIPH_RECOVERY_INPROG 0x20
121 #define CAM_PERIPH_SENSE_INPROG 0x40
122 u_int32_t immediate_priority;
123 u_int32_t refcount;
124 SLIST_HEAD(, ccb_hdr) ccb_list; /* For "immediate" requests */
125 SLIST_ENTRY(cam_periph) periph_links;
126 TAILQ_ENTRY(cam_periph) unit_links;
127 ac_callback_t *deferred_callback;
128 ac_code deferred_ac;
129 };
130
131 #define CAM_PERIPH_MAXMAPS 2
132
133 struct cam_periph_map_info {
134 int num_bufs_used;
135 struct buf *bp[CAM_PERIPH_MAXMAPS];
136 };
137
138 cam_status cam_periph_alloc(periph_ctor_t *periph_ctor,
139 periph_oninv_t *periph_oninvalidate,
140 periph_dtor_t *periph_dtor,
141 periph_start_t *periph_start,
142 char *name, cam_periph_type type, struct cam_path *,
143 ac_callback_t *, ac_code, void *arg);
144 struct cam_periph *cam_periph_find(struct cam_path *path, char *name);
145 cam_status cam_periph_acquire(struct cam_periph *periph);
146 void cam_periph_release(struct cam_periph *periph);
147 void cam_periph_release_locked(struct cam_periph *periph);
148 int cam_periph_hold(struct cam_periph *periph, int priority);
149 void cam_periph_unhold(struct cam_periph *periph);
150 void cam_periph_invalidate(struct cam_periph *periph);
151 int cam_periph_mapmem(union ccb *ccb,
152 struct cam_periph_map_info *mapinfo);
153 void cam_periph_unmapmem(union ccb *ccb,
154 struct cam_periph_map_info *mapinfo);
155 union ccb *cam_periph_getccb(struct cam_periph *periph,
156 u_int32_t priority);
157 void cam_periph_ccbwait(union ccb *ccb);
158 int cam_periph_runccb(union ccb *ccb,
159 int (*error_routine)(union ccb *ccb,
160 cam_flags camflags,
161 u_int32_t sense_flags),
162 cam_flags camflags, u_int32_t sense_flags,
163 struct devstat *ds);
164 int cam_periph_ioctl(struct cam_periph *periph, u_long cmd,
165 caddr_t addr,
166 int (*error_routine)(union ccb *ccb,
167 cam_flags camflags,
168 u_int32_t sense_flags));
169 void cam_freeze_devq(struct cam_path *path);
170 void cam_freeze_devq_arg(struct cam_path *path, u_int32_t flags,
171 uint32_t arg);
172 u_int32_t cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
173 u_int32_t opening_reduction, u_int32_t arg,
174 int getcount_only);
175 void cam_periph_async(struct cam_periph *periph, u_int32_t code,
176 struct cam_path *path, void *arg);
177 void cam_periph_bus_settle(struct cam_periph *periph,
178 u_int bus_settle_ms);
179 void cam_periph_freeze_after_event(struct cam_periph *periph,
180 struct timeval* event_time,
181 u_int duration_ms);
182 int cam_periph_error(union ccb *ccb, cam_flags camflags,
183 u_int32_t sense_flags, union ccb *save_ccb);
184
185 static __inline void
186 cam_periph_lock(struct cam_periph *periph)
187 {
188 mtx_lock(periph->sim->mtx);
189 }
190
191 static __inline void
192 cam_periph_unlock(struct cam_periph *periph)
193 {
194 mtx_unlock(periph->sim->mtx);
195 }
196
197 static __inline int
198 cam_periph_owned(struct cam_periph *periph)
199 {
200 return (mtx_owned(periph->sim->mtx));
201 }
202
203 #endif /* _KERNEL */
204 #endif /* _CAM_CAM_PERIPH_H */
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