cam_periph.h revision 139743 
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: head/sys/cam/cam_periph.h 139743 2005-01-05 22:34:37Z imp $
29 */
30
31#ifndef _CAM_CAM_PERIPH_H
32#define _CAM_CAM_PERIPH_H 1
33
34#include <sys/queue.h>
35
36#ifdef _KERNEL
37
38struct devstat;
39
40extern struct cam_periph *xpt_periph;
41
42extern struct periph_driver **periph_drivers;
43void periphdriver_register(void *);
44
45#include <sys/module.h>
46#define PERIPHDRIVER_DECLARE(name, driver) \
47	static int name ## _modevent(module_t mod, int type, void *data) \
48	{ \
49		switch (type) { \
50		case MOD_LOAD: \
51			periphdriver_register(data); \
52			break; \
53		case MOD_UNLOAD: \
54			printf(#name " module unload - not possible for this module type\n"); \
55			return EINVAL; \
56		default: \
57			return EOPNOTSUPP; \
58		} \
59		return 0; \
60	} \
61	static moduledata_t name ## _mod = { \
62		#name, \
63		name ## _modevent, \
64		(void *)&driver \
65	}; \
66	DECLARE_MODULE(name, name ## _mod, SI_SUB_DRIVERS, SI_ORDER_ANY); \
67	MODULE_DEPEND(name, cam, 1, 1, 1)
68
69typedef void (periph_init_t)(void); /*
70				     * Callback informing the peripheral driver
71				     * it can perform it's initialization since
72				     * the XPT is now fully initialized.
73				     */
74typedef periph_init_t *periph_init_func_t;
75
76struct periph_driver {
77	periph_init_func_t	 init;
78	char			 *driver_name;
79	TAILQ_HEAD(,cam_periph)	 units;
80	u_int			 generation;
81};
82
83typedef enum {
84	CAM_PERIPH_BIO
85} cam_periph_type;
86
87/* Generically usefull offsets into the peripheral private area */
88#define ppriv_ptr0 periph_priv.entries[0].ptr
89#define ppriv_ptr1 periph_priv.entries[1].ptr
90#define ppriv_field0 periph_priv.entries[0].field
91#define ppriv_field1 periph_priv.entries[1].field
92
93typedef void		periph_start_t (struct cam_periph *periph,
94					union ccb *start_ccb);
95typedef cam_status	periph_ctor_t (struct cam_periph *periph,
96				       void *arg);
97typedef void		periph_oninv_t (struct cam_periph *periph);
98typedef void		periph_dtor_t (struct cam_periph *periph);
99struct cam_periph {
100	cam_pinfo		 pinfo;
101	periph_start_t		*periph_start;
102	periph_oninv_t		*periph_oninval;
103	periph_dtor_t		*periph_dtor;
104	char			*periph_name;
105	struct cam_path		*path;	/* Compiled path to device */
106	void			*softc;
107	u_int32_t		 unit_number;
108	cam_periph_type		 type;
109	u_int32_t		 flags;
110#define CAM_PERIPH_RUNNING		0x01
111#define CAM_PERIPH_LOCKED		0x02
112#define CAM_PERIPH_LOCK_WANTED		0x04
113#define CAM_PERIPH_INVALID		0x08
114#define CAM_PERIPH_NEW_DEV_FOUND	0x10
115#define CAM_PERIPH_RECOVERY_INPROG	0x20
116	u_int32_t		 immediate_priority;
117	u_int32_t		 refcount;
118	SLIST_HEAD(, ccb_hdr)	 ccb_list;	/* For "immediate" requests */
119	SLIST_ENTRY(cam_periph)  periph_links;
120	TAILQ_ENTRY(cam_periph)  unit_links;
121	ac_callback_t		*deferred_callback;
122	ac_code			 deferred_ac;
123};
124
125#define CAM_PERIPH_MAXMAPS	2
126
127struct cam_periph_map_info {
128	int		num_bufs_used;
129	struct buf	*bp[CAM_PERIPH_MAXMAPS];
130};
131
132cam_status cam_periph_alloc(periph_ctor_t *periph_ctor,
133			    periph_oninv_t *periph_oninvalidate,
134			    periph_dtor_t *periph_dtor,
135			    periph_start_t *periph_start,
136			    char *name, cam_periph_type type, struct cam_path *,
137			    ac_callback_t *, ac_code, void *arg);
138struct cam_periph *cam_periph_find(struct cam_path *path, char *name);
139int		cam_periph_lock(struct cam_periph *periph, int priority);
140void		cam_periph_unlock(struct cam_periph *periph);
141cam_status	cam_periph_acquire(struct cam_periph *periph);
142void		cam_periph_release(struct cam_periph *periph);
143void		cam_periph_invalidate(struct cam_periph *periph);
144int		cam_periph_mapmem(union ccb *ccb,
145				  struct cam_periph_map_info *mapinfo);
146void		cam_periph_unmapmem(union ccb *ccb,
147				    struct cam_periph_map_info *mapinfo);
148union ccb	*cam_periph_getccb(struct cam_periph *periph,
149				   u_int32_t priority);
150void		cam_periph_ccbwait(union ccb *ccb);
151int		cam_periph_runccb(union ccb *ccb,
152				  int (*error_routine)(union ccb *ccb,
153						       cam_flags camflags,
154						       u_int32_t sense_flags),
155				  cam_flags camflags, u_int32_t sense_flags,
156				  struct devstat *ds);
157int		cam_periph_ioctl(struct cam_periph *periph, int cmd,
158				 caddr_t addr,
159				 int (*error_routine)(union ccb *ccb,
160						      cam_flags camflags,
161						      u_int32_t sense_flags));
162void		cam_freeze_devq(struct cam_path *path);
163u_int32_t	cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
164				 u_int32_t opening_reduction, u_int32_t timeout,
165				 int getcount_only);
166void		cam_periph_async(struct cam_periph *periph, u_int32_t code,
167		 		 struct cam_path *path, void *arg);
168void		cam_periph_bus_settle(struct cam_periph *periph,
169				      u_int bus_settle_ms);
170void		cam_periph_freeze_after_event(struct cam_periph *periph,
171					      struct timeval* event_time,
172					      u_int duration_ms);
173int		cam_periph_error(union ccb *ccb, cam_flags camflags,
174				 u_int32_t sense_flags, union ccb *save_ccb);
175
176#endif /* _KERNEL */
177#endif /* _CAM_CAM_PERIPH_H */
178