FreeBSD/Linux Kernel Cross Reference
sys/cam/cam_sim.h
1 /*-
2 * Data structures and definitions for SCSI Interface Modules (SIMs).
3 *
4 * Copyright (c) 1997 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: src/sys/cam/cam_sim.h,v 1.8 2007/04/19 14:28:43 scottl Exp $
29 */
30
31 #ifndef _CAM_CAM_SIM_H
32 #define _CAM_CAM_SIM_H 1
33
34 #ifdef _KERNEL
35
36 /*
37 * The sim driver creates a sim for each controller. The sim device
38 * queue is separately created in order to allow resource sharing between
39 * sims. For instance, a driver may create one sim for each channel of
40 * a multi-channel controller and use the same queue for each channel.
41 * In this way, the queue resources are shared across all the channels
42 * of the multi-channel controller.
43 */
44
45 struct cam_sim;
46 struct cam_devq;
47
48 typedef void (*sim_action_func)(struct cam_sim *sim, union ccb *ccb);
49 typedef void (*sim_poll_func)(struct cam_sim *sim);
50
51 struct cam_devq * cam_simq_alloc(u_int32_t max_sim_transactions);
52 void cam_simq_free(struct cam_devq *devq);
53
54 struct cam_sim * cam_sim_alloc(sim_action_func sim_action,
55 sim_poll_func sim_poll,
56 const char *sim_name,
57 void *softc,
58 u_int32_t unit,
59 struct mtx *mtx,
60 int max_dev_transactions,
61 int max_tagged_dev_transactions,
62 struct cam_devq *queue);
63 void cam_sim_free(struct cam_sim *sim, int free_devq);
64
65 /* Optional sim attributes may be set with these. */
66 void cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id);
67
68
69
70 /* Convenience routines for accessing sim attributes. */
71 static __inline u_int32_t cam_sim_path(struct cam_sim *sim);
72 static __inline const char * cam_sim_name(struct cam_sim *sim);
73 static __inline void * cam_sim_softc(struct cam_sim *sim);
74 static __inline u_int32_t cam_sim_unit(struct cam_sim *sim);
75 static __inline u_int32_t cam_sim_bus(struct cam_sim *sim);
76
77
78
79 /* Generically useful offsets into the sim private area */
80 #define spriv_ptr0 sim_priv.entries[0].ptr
81 #define spriv_ptr1 sim_priv.entries[1].ptr
82 #define spriv_field0 sim_priv.entries[0].field
83 #define spriv_field1 sim_priv.entries[1].field
84
85 /*
86 * The sim driver should not access anything directly from this
87 * structure.
88 */
89 struct cam_sim {
90 sim_action_func sim_action;
91 sim_poll_func sim_poll;
92 const char *sim_name;
93 void *softc;
94 struct mtx *mtx;
95 TAILQ_HEAD(, ccb_hdr) sim_doneq;
96 TAILQ_ENTRY(cam_sim) links;
97 u_int32_t path_id;/* The Boot device may set this to 0? */
98 u_int32_t unit_number;
99 u_int32_t bus_id;
100 int max_tagged_dev_openings;
101 int max_dev_openings;
102 u_int32_t flags;
103 #define CAM_SIM_REL_TIMEOUT_PENDING 0x01
104 #define CAM_SIM_MPSAFE 0x02
105 #define CAM_SIM_ON_DONEQ 0x04
106 struct callout callout;
107 struct cam_devq *devq; /* Device Queue to use for this SIM */
108
109 /* "Pool" of inactive ccbs managed by xpt_alloc_ccb and xpt_free_ccb */
110 SLIST_HEAD(,ccb_hdr) ccb_freeq;
111 /*
112 * Maximum size of ccb pool. Modified as devices are added/removed
113 * or have their * opening counts changed.
114 */
115 u_int max_ccbs;
116 /* Current count of allocated ccbs */
117 u_int ccb_count;
118
119 };
120
121 #define CAM_SIM_LOCK(sim) mtx_lock((sim)->mtx);
122 #define CAM_SIM_UNLOCK(sim) mtx_unlock((sim)->mtx);
123
124 static __inline u_int32_t
125 cam_sim_path(struct cam_sim *sim)
126 {
127 return (sim->path_id);
128 }
129
130 static __inline const char *
131 cam_sim_name(struct cam_sim *sim)
132 {
133 return (sim->sim_name);
134 }
135
136 static __inline void *
137 cam_sim_softc(struct cam_sim *sim)
138 {
139 return (sim->softc);
140 }
141
142 static __inline u_int32_t
143 cam_sim_unit(struct cam_sim *sim)
144 {
145 return (sim->unit_number);
146 }
147
148 static __inline u_int32_t
149 cam_sim_bus(struct cam_sim *sim)
150 {
151 return (sim->bus_id);
152 }
153
154 #endif /* _KERNEL */
155 #endif /* _CAM_CAM_SIM_H */
156
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