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 /*
28 * support functions for hba drivers to handle scsi reset notifications.
29 */
30
31 #include <sys/scsi/scsi.h>
32 #include <sys/scsi/impl/scsi_reset_notify.h>
33
34 /*
35 * routine for reset notification setup.
36 * The function is entered without adapter driver mutex being held.
37 */
38
39 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)40 scsi_hba_reset_notify_setup(struct scsi_address *ap, int flag,
41 void (*callback)(caddr_t), caddr_t arg, kmutex_t *mutex,
42 struct scsi_reset_notify_entry **listp)
43 {
44 struct scsi_reset_notify_entry *p, *beforep;
45 int rval = DDI_FAILURE;
46
47 mutex_enter(mutex);
48 p = *listp;
49 beforep = NULL;
50 while (p) {
51 if (p->ap == ap)
52 break; /* An entry exist for this target */
53 beforep = p;
54 p = p->next;
55 }
56
57 if ((flag & SCSI_RESET_CANCEL) && (p != NULL)) {
58 if (beforep == NULL) {
59 *listp = p->next;
60 } else {
61 beforep->next = p->next;
62 }
63 kmem_free(p, sizeof (struct scsi_reset_notify_entry));
64 rval = DDI_SUCCESS;
65
66 } else if ((flag & SCSI_RESET_NOTIFY) && (p == NULL)) {
67 p = kmem_zalloc(sizeof (struct scsi_reset_notify_entry),
68 KM_SLEEP);
69 p->ap = ap;
70 p->callback = callback;
71 p->arg = arg;
72 p->next = *listp;
73 *listp = p;
74 rval = DDI_SUCCESS;
75 }
76 mutex_exit(mutex);
77 return (rval);
78 }
79
80 /*
81 * routine to deallocate the callback list
82 */
83 void
scsi_hba_reset_notify_tear_down(struct scsi_reset_notify_entry * listp)84 scsi_hba_reset_notify_tear_down(struct scsi_reset_notify_entry *listp)
85 {
86 struct scsi_reset_notify_entry *p, *next;
87
88 p = listp;
89 while (p) {
90 next = p->next;
91 kmem_free(p, sizeof (struct scsi_reset_notify_entry));
92 p = next;
93 }
94 }
95
96
97 /*
98 * routine to perform the notification callbacks after a reset.
99 * The function is entered with adapter driver mutex being held.
100 */
101 void
scsi_hba_reset_notify_callback(kmutex_t * mutex,struct scsi_reset_notify_entry ** listp)102 scsi_hba_reset_notify_callback(kmutex_t *mutex,
103 struct scsi_reset_notify_entry **listp)
104 {
105 int i, count;
106 struct scsi_reset_notify_entry *p;
107 struct notify_entry {
108 void (*callback)(caddr_t);
109 caddr_t arg;
110 } *list;
111
112 if ((p = *listp) == NULL)
113 return;
114
115 count = 0;
116 while (p != NULL) {
117 count++;
118 p = p->next;
119 }
120
121 list = kmem_alloc(count * sizeof (struct notify_entry), KM_NOSLEEP);
122 if (list == NULL) {
123 cmn_err(CE_WARN, "scsi_reset_notify: kmem_alloc failed");
124 return;
125 }
126
127 for (i = 0, p = *listp; i < count; i++, p = p->next) {
128 list[i].callback = p->callback;
129 list[i].arg = p->arg;
130 }
131
132 mutex_exit(mutex);
133 for (i = 0; i < count; i++) {
134 if (list[i].callback != NULL)
135 (void) (*list[i].callback)(list[i].arg);
136 }
137 kmem_free(list, count * sizeof (struct notify_entry));
138 mutex_enter(mutex);
139 }
140