1 /*-
2 * Data structures and definitions for SCSI Interface Modules (SIMs).
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c) 1997 Justin T. Gibbs.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions, and the following disclaimer,
14 * without modification, immediately at the beginning of the file.
15 * 2. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
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(uint32_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 uint32_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 void cam_sim_hold(struct cam_sim *sim);
65 void cam_sim_release(struct cam_sim *sim);
66
67 /* Optional sim attributes may be set with these. */
68 void cam_sim_set_path(struct cam_sim *sim, uint32_t path_id);
69
70 /* Generically useful offsets into the sim private area */
71 #define spriv_ptr0 sim_priv.entries[0].ptr
72 #define spriv_ptr1 sim_priv.entries[1].ptr
73 #define spriv_field0 sim_priv.entries[0].field
74 #define spriv_field1 sim_priv.entries[1].field
75
76 /*
77 * The sim driver should not access anything directly from this
78 * structure.
79 */
80 struct cam_sim {
81 sim_action_func sim_action;
82 sim_poll_func sim_poll;
83 const char *sim_name;
84 void *softc;
85 struct mtx *mtx;
86 TAILQ_ENTRY(cam_sim) links;
87 uint32_t path_id;/* The Boot device may set this to 0? */
88 uint32_t unit_number;
89 uint32_t bus_id;
90 int max_tagged_dev_openings;
91 int max_dev_openings;
92 uint32_t flags;
93 struct cam_devq *devq; /* Device Queue to use for this SIM */
94 int refcount; /* References to the SIM. */
95 };
96
97 static __inline uint32_t
cam_sim_path(const struct cam_sim * sim)98 cam_sim_path(const struct cam_sim *sim)
99 {
100 return (sim->path_id);
101 }
102
103 static __inline const char *
cam_sim_name(const struct cam_sim * sim)104 cam_sim_name(const struct cam_sim *sim)
105 {
106 return (sim->sim_name);
107 }
108
109 static __inline void *
cam_sim_softc(const struct cam_sim * sim)110 cam_sim_softc(const struct cam_sim *sim)
111 {
112 return (sim->softc);
113 }
114
115 static __inline uint32_t
cam_sim_unit(const struct cam_sim * sim)116 cam_sim_unit(const struct cam_sim *sim)
117 {
118 return (sim->unit_number);
119 }
120
121 static __inline uint32_t
cam_sim_bus(const struct cam_sim * sim)122 cam_sim_bus(const struct cam_sim *sim)
123 {
124 return (sim->bus_id);
125 }
126
127 static __inline bool
cam_sim_pollable(const struct cam_sim * sim)128 cam_sim_pollable(const struct cam_sim *sim)
129 {
130 return (sim->sim_poll != NULL);
131 }
132
133 #endif /* _KERNEL */
134 #endif /* _CAM_CAM_SIM_H */
135