FreeBSD/Linux Kernel Cross Reference
sys/cam/cam_sim.c
1 /*-
2 * Common functions 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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/9.0/sys/cam/cam_sim.c 203108 2010-01-28 08:41:30Z mav $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
35 #include <sys/kernel.h>
36 #include <sys/lock.h>
37 #include <sys/mutex.h>
38
39 #include <cam/cam.h>
40 #include <cam/cam_ccb.h>
41 #include <cam/cam_sim.h>
42 #include <cam/cam_queue.h>
43
44 #define CAM_PATH_ANY (u_int32_t)-1
45
46 MALLOC_DEFINE(M_CAMSIM, "CAM SIM", "CAM SIM buffers");
47
48 struct cam_devq *
49 cam_simq_alloc(u_int32_t max_sim_transactions)
50 {
51 return (cam_devq_alloc(/*size*/0, max_sim_transactions));
52 }
53
54 void
55 cam_simq_free(struct cam_devq *devq)
56 {
57 cam_devq_free(devq);
58 }
59
60 struct cam_sim *
61 cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
62 const char *sim_name, void *softc, u_int32_t unit,
63 struct mtx *mtx, int max_dev_transactions,
64 int max_tagged_dev_transactions, struct cam_devq *queue)
65 {
66 struct cam_sim *sim;
67
68 if (mtx == NULL)
69 return (NULL);
70
71 sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
72 M_CAMSIM, M_ZERO | M_NOWAIT);
73
74 if (sim == NULL)
75 return (NULL);
76
77 sim->sim_action = sim_action;
78 sim->sim_poll = sim_poll;
79 sim->sim_name = sim_name;
80 sim->softc = softc;
81 sim->path_id = CAM_PATH_ANY;
82 sim->unit_number = unit;
83 sim->bus_id = 0; /* set in xpt_bus_register */
84 sim->max_tagged_dev_openings = max_tagged_dev_transactions;
85 sim->max_dev_openings = max_dev_transactions;
86 sim->flags = 0;
87 sim->refcount = 1;
88 sim->devq = queue;
89 sim->max_ccbs = 8; /* Reserve for management purposes. */
90 sim->mtx = mtx;
91 if (mtx == &Giant) {
92 sim->flags |= 0;
93 callout_init(&sim->callout, 0);
94 } else {
95 sim->flags |= CAM_SIM_MPSAFE;
96 callout_init(&sim->callout, 1);
97 }
98
99 SLIST_INIT(&sim->ccb_freeq);
100 TAILQ_INIT(&sim->sim_doneq);
101
102 return (sim);
103 }
104
105 void
106 cam_sim_free(struct cam_sim *sim, int free_devq)
107 {
108 int error;
109
110 sim->refcount--;
111 if (sim->refcount > 0) {
112 error = msleep(sim, sim->mtx, PRIBIO, "simfree", 0);
113 KASSERT(error == 0, ("invalid error value for msleep(9)"));
114 }
115
116 KASSERT(sim->refcount == 0, ("sim->refcount == 0"));
117
118 if (free_devq)
119 cam_simq_free(sim->devq);
120 free(sim, M_CAMSIM);
121 }
122
123 void
124 cam_sim_release(struct cam_sim *sim)
125 {
126 KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
127 mtx_assert(sim->mtx, MA_OWNED);
128
129 sim->refcount--;
130 if (sim->refcount == 0)
131 wakeup(sim);
132 }
133
134 void
135 cam_sim_hold(struct cam_sim *sim)
136 {
137 KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
138 mtx_assert(sim->mtx, MA_OWNED);
139
140 sim->refcount++;
141 }
142
143 void
144 cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
145 {
146 sim->path_id = path_id;
147 }
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