The cam_sim structure was being deallocated unconditionally by device
[dragonfly.git] / sys / bus / cam / cam_sim.c
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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 * $FreeBSD: src/sys/cam/cam_sim.c,v 1.3 1999/08/28 00:40:42 peter Exp $
3aed1355 29 * $DragonFly: src/sys/bus/cam/cam_sim.c,v 1.6 2004/03/15 01:10:30 dillon Exp $
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30 */
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/malloc.h>
35
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36#include "cam.h"
37#include "cam_ccb.h"
38#include "cam_sim.h"
39#include "cam_queue.h"
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40
41#define CAM_PATH_ANY (u_int32_t)-1
42
43struct cam_devq *
44cam_simq_alloc(u_int32_t max_sim_transactions)
45{
46 return (cam_devq_alloc(/*size*/0, max_sim_transactions));
47}
48
49void
3aed1355 50cam_simq_release(struct cam_devq *devq)
984263bc 51{
3aed1355 52 cam_devq_release(devq);
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53}
54
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55/*
56 * cam_sim_alloc() may potentially be called from an interrupt (?) but
57 * unexpected things happen to the system if malloc() returns NULL so we
58 * use M_INTWAIT anyway.
59 */
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60struct cam_sim *
61cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
f15db79e 62 const char *sim_name, void *softc, u_int32_t unit,
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63 int max_dev_transactions,
64 int max_tagged_dev_transactions, struct cam_devq *queue)
65{
66 struct cam_sim *sim;
67
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68 /*
69 * XXX ahd was limited to 256 instead of 512 for unknown reasons,
70 * move that to a global limit here. We may be able to remove this
71 * code, needs testing.
72 */
73 if (max_dev_transactions > 256)
74 max_dev_transactions = 256;
75 if (max_tagged_dev_transactions > 256)
76 max_tagged_dev_transactions = 256;
77
78 /*
79 * Allocate a simq or use the supplied (possibly shared) simq.
80 */
81 if (queue == NULL)
82 queue = cam_simq_alloc(max_tagged_dev_transactions);
83 else
84 cam_devq_reference(queue);
85
86 sim = malloc(sizeof(struct cam_sim), M_DEVBUF, M_INTWAIT | M_ZERO);
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87 sim->sim_action = sim_action;
88 sim->sim_poll = sim_poll;
89 sim->sim_name = sim_name;
90 sim->softc = softc;
91 sim->path_id = CAM_PATH_ANY;
92 sim->unit_number = unit;
93 sim->bus_id = 0; /* set in xpt_bus_register */
94 sim->max_tagged_dev_openings = max_tagged_dev_transactions;
95 sim->max_dev_openings = max_dev_transactions;
96 sim->flags = 0;
3aed1355 97 sim->refcount = 1;
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98 callout_handle_init(&sim->c_handle);
99 sim->devq = queue;
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100
101 return (sim);
102}
103
104void
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105cam_sim_free(struct cam_sim *sim)
106{
107 cam_sim_release(sim, CAM_SIM_DEVQ | CAM_SIM_SOFTC);
108}
109
110void
111cam_sim_release(struct cam_sim *sim, int flags)
984263bc 112{
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113 if (flags & CAM_SIM_SOFTC)
114 sim->softc = NULL;
115 if (flags & CAM_SIM_DEVQ) {
116 cam_simq_release(sim->devq);
117 sim->devq = NULL;
118 }
119 if (sim->refcount == 1) {
120 sim->refcount = 0;
121 free(sim, M_DEVBUF);
122 } else {
123 --sim->refcount;
124 }
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125}
126
127void
128cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
129{
130 sim->path_id = path_id;
131}