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("$FreeBSD$");
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 #include <cam/cam_xpt.h>
44
45 #define CAM_PATH_ANY (u_int32_t)-1
46
47 MALLOC_DEFINE(M_CAMSIM, "CAM SIM", "CAM SIM buffers");
48
49 struct cam_devq *
50 cam_simq_alloc(u_int32_t max_sim_transactions)
51 {
52 return (cam_devq_alloc(/*size*/0, max_sim_transactions));
53 }
54
55 void
56 cam_simq_free(struct cam_devq *devq)
57 {
58 cam_devq_free(devq);
59 }
60
61 struct cam_sim *
62 cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
63 const char *sim_name, void *softc, u_int32_t unit,
64 struct mtx *mtx, int max_dev_transactions,
65 int max_tagged_dev_transactions, struct cam_devq *queue)
66 {
67 struct cam_sim *sim;
68
69 if (mtx == NULL)
70 return (NULL);
71
72 sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
73 M_CAMSIM, M_ZERO | M_NOWAIT);
74
75 if (sim == NULL)
76 return (NULL);
77
78 sim->sim_action = sim_action;
79 sim->sim_poll = sim_poll;
80 sim->sim_name = sim_name;
81 sim->softc = softc;
82 sim->path_id = CAM_PATH_ANY;
83 sim->unit_number = unit;
84 sim->bus_id = 0; /* set in xpt_bus_register */
85 sim->max_tagged_dev_openings = max_tagged_dev_transactions;
86 sim->max_dev_openings = max_dev_transactions;
87 sim->flags = 0;
88 sim->refcount = 1;
89 sim->devq = queue;
90 sim->max_ccbs = 8; /* Reserve for management purposes. */
91 sim->mtx = mtx;
92 if (mtx == &Giant) {
93 sim->flags |= 0;
94 callout_init(&sim->callout, 0);
95 } else {
96 sim->flags |= CAM_SIM_MPSAFE;
97 callout_init(&sim->callout, 1);
98 }
99
100 SLIST_INIT(&sim->ccb_freeq);
101 TAILQ_INIT(&sim->sim_doneq);
102
103 return (sim);
104 }
105
106 void
107 cam_sim_free(struct cam_sim *sim, int free_devq)
108 {
109 union ccb *ccb;
110 int error;
111
112 sim->refcount--;
113 if (sim->refcount > 0) {
114 error = msleep(sim, sim->mtx, PRIBIO, "simfree", 0);
115 KASSERT(error == 0, ("invalid error value for msleep(9)"));
116 }
117
118 KASSERT(sim->refcount == 0, ("sim->refcount == 0"));
119
120 while ((ccb = (union ccb *)SLIST_FIRST(&sim->ccb_freeq)) != NULL) {
121 SLIST_REMOVE_HEAD(&sim->ccb_freeq, xpt_links.sle);
122 xpt_free_ccb(ccb);
123 }
124 if (free_devq)
125 cam_simq_free(sim->devq);
126 free(sim, M_CAMSIM);
127 }
128
129 void
130 cam_sim_release(struct cam_sim *sim)
131 {
132 KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
133 mtx_assert(sim->mtx, MA_OWNED);
134
135 sim->refcount--;
136 if (sim->refcount == 0)
137 wakeup(sim);
138 }
139
140 void
141 cam_sim_hold(struct cam_sim *sim)
142 {
143 KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
144 mtx_assert(sim->mtx, MA_OWNED);
145
146 sim->refcount++;
147 }
148
149 void
150 cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
151 {
152 sim->path_id = path_id;
153 }
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