1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright (c) 1998 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * support functions for hba drivers to handle scsi reset notifications.
31 */
32
33 #include <sys/scsi/scsi.h>
34 #include <sys/scsi/impl/scsi_reset_notify.h>
35
36 /*
37 * routine for reset notification setup.
38 * The function is entered without adapter driver mutex being held.
39 */
40
41 int
scsi_hba_reset_notify_setup(struct scsi_address * ap,int flag,void (* callback)(caddr_t),caddr_t arg,kmutex_t * mutex,struct scsi_reset_notify_entry ** listp)42 scsi_hba_reset_notify_setup(struct scsi_address *ap, int flag,
43 void (*callback)(caddr_t), caddr_t arg, kmutex_t *mutex,
44 struct scsi_reset_notify_entry **listp)
45 {
46 struct scsi_reset_notify_entry *p, *beforep;
47 int rval = DDI_FAILURE;
48
49 mutex_enter(mutex);
50 p = *listp;
51 beforep = NULL;
52 while (p) {
53 if (p->ap == ap)
54 break; /* An entry exist for this target */
55 beforep = p;
56 p = p->next;
57 }
58
59 if ((flag & SCSI_RESET_CANCEL) && (p != NULL)) {
60 if (beforep == NULL) {
61 *listp = p->next;
62 } else {
63 beforep->next = p->next;
64 }
65 kmem_free(p, sizeof (struct scsi_reset_notify_entry));
66 rval = DDI_SUCCESS;
67
68 } else if ((flag & SCSI_RESET_NOTIFY) && (p == NULL)) {
69 p = kmem_zalloc(sizeof (struct scsi_reset_notify_entry),
70 KM_SLEEP);
71 p->ap = ap;
72 p->callback = callback;
73 p->arg = arg;
74 p->next = *listp;
75 *listp = p;
76 rval = DDI_SUCCESS;
77 }
78 mutex_exit(mutex);
79 return (rval);
80 }
81
82 /*
83 * routine to deallocate the callback list
84 */
85 void
scsi_hba_reset_notify_tear_down(struct scsi_reset_notify_entry * listp)86 scsi_hba_reset_notify_tear_down(struct scsi_reset_notify_entry *listp)
87 {
88 struct scsi_reset_notify_entry *p, *next;
89
90 p = listp;
91 while (p) {
92 next = p->next;
93 kmem_free(p, sizeof (struct scsi_reset_notify_entry));
94 p = next;
95 }
96 }
97
98
99 /*
100 * routine to perform the notification callbacks after a reset.
101 * The function is entered with adapter driver mutex being held.
102 */
103 void
scsi_hba_reset_notify_callback(kmutex_t * mutex,struct scsi_reset_notify_entry ** listp)104 scsi_hba_reset_notify_callback(kmutex_t *mutex,
105 struct scsi_reset_notify_entry **listp)
106 {
107 int i, count;
108 struct scsi_reset_notify_entry *p;
109 struct notify_entry {
110 void (*callback)(caddr_t);
111 caddr_t arg;
112 } *list;
113
114 if ((p = *listp) == NULL)
115 return;
116
117 count = 0;
118 while (p != NULL) {
119 count++;
120 p = p->next;
121 }
122
123 list = kmem_alloc(count * sizeof (struct notify_entry), KM_NOSLEEP);
124 if (list == NULL) {
125 cmn_err(CE_WARN, "scsi_reset_notify: kmem_alloc failed");
126 return;
127 }
128
129 for (i = 0, p = *listp; i < count; i++, p = p->next) {
130 list[i].callback = p->callback;
131 list[i].arg = p->arg;
132 }
133
134 mutex_exit(mutex);
135 for (i = 0; i < count; i++) {
136 if (list[i].callback != NULL)
137 (void) (*list[i].callback)(list[i].arg);
138 }
139 kmem_free(list, count * sizeof (struct notify_entry));
140 mutex_enter(mutex);
141 }
142