1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate *
4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate * with the License.
8*7c478bd9Sstevel@tonic-gate *
9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate *
14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate *
20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate * Copyright (c) 1998 by Sun Microsystems, Inc.
24*7c478bd9Sstevel@tonic-gate * All rights reserved.
25*7c478bd9Sstevel@tonic-gate */
26*7c478bd9Sstevel@tonic-gate
27*7c478bd9Sstevel@tonic-gate /*
28*7c478bd9Sstevel@tonic-gate * support functions for hba drivers to handle scsi reset notifications.
29*7c478bd9Sstevel@tonic-gate */
30*7c478bd9Sstevel@tonic-gate
31*7c478bd9Sstevel@tonic-gate #include <sys/scsi/scsi.h>
32*7c478bd9Sstevel@tonic-gate #include <sys/scsi/impl/scsi_reset_notify.h>
33*7c478bd9Sstevel@tonic-gate
34*7c478bd9Sstevel@tonic-gate /*
35*7c478bd9Sstevel@tonic-gate * routine for reset notification setup.
36*7c478bd9Sstevel@tonic-gate * The function is entered without adapter driver mutex being held.
37*7c478bd9Sstevel@tonic-gate */
38*7c478bd9Sstevel@tonic-gate
39*7c478bd9Sstevel@tonic-gate 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*7c478bd9Sstevel@tonic-gate scsi_hba_reset_notify_setup(struct scsi_address *ap, int flag,
41*7c478bd9Sstevel@tonic-gate void (*callback)(caddr_t), caddr_t arg, kmutex_t *mutex,
42*7c478bd9Sstevel@tonic-gate struct scsi_reset_notify_entry **listp)
43*7c478bd9Sstevel@tonic-gate {
44*7c478bd9Sstevel@tonic-gate struct scsi_reset_notify_entry *p, *beforep;
45*7c478bd9Sstevel@tonic-gate int rval = DDI_FAILURE;
46*7c478bd9Sstevel@tonic-gate
47*7c478bd9Sstevel@tonic-gate mutex_enter(mutex);
48*7c478bd9Sstevel@tonic-gate p = *listp;
49*7c478bd9Sstevel@tonic-gate beforep = NULL;
50*7c478bd9Sstevel@tonic-gate while (p) {
51*7c478bd9Sstevel@tonic-gate if (p->ap == ap)
52*7c478bd9Sstevel@tonic-gate break; /* An entry exist for this target */
53*7c478bd9Sstevel@tonic-gate beforep = p;
54*7c478bd9Sstevel@tonic-gate p = p->next;
55*7c478bd9Sstevel@tonic-gate }
56*7c478bd9Sstevel@tonic-gate
57*7c478bd9Sstevel@tonic-gate if ((flag & SCSI_RESET_CANCEL) && (p != NULL)) {
58*7c478bd9Sstevel@tonic-gate if (beforep == NULL) {
59*7c478bd9Sstevel@tonic-gate *listp = p->next;
60*7c478bd9Sstevel@tonic-gate } else {
61*7c478bd9Sstevel@tonic-gate beforep->next = p->next;
62*7c478bd9Sstevel@tonic-gate }
63*7c478bd9Sstevel@tonic-gate kmem_free(p, sizeof (struct scsi_reset_notify_entry));
64*7c478bd9Sstevel@tonic-gate rval = DDI_SUCCESS;
65*7c478bd9Sstevel@tonic-gate
66*7c478bd9Sstevel@tonic-gate } else if ((flag & SCSI_RESET_NOTIFY) && (p == NULL)) {
67*7c478bd9Sstevel@tonic-gate p = kmem_zalloc(sizeof (struct scsi_reset_notify_entry),
68*7c478bd9Sstevel@tonic-gate KM_SLEEP);
69*7c478bd9Sstevel@tonic-gate p->ap = ap;
70*7c478bd9Sstevel@tonic-gate p->callback = callback;
71*7c478bd9Sstevel@tonic-gate p->arg = arg;
72*7c478bd9Sstevel@tonic-gate p->next = *listp;
73*7c478bd9Sstevel@tonic-gate *listp = p;
74*7c478bd9Sstevel@tonic-gate rval = DDI_SUCCESS;
75*7c478bd9Sstevel@tonic-gate }
76*7c478bd9Sstevel@tonic-gate mutex_exit(mutex);
77*7c478bd9Sstevel@tonic-gate return (rval);
78*7c478bd9Sstevel@tonic-gate }
79*7c478bd9Sstevel@tonic-gate
80*7c478bd9Sstevel@tonic-gate /*
81*7c478bd9Sstevel@tonic-gate * routine to deallocate the callback list
82*7c478bd9Sstevel@tonic-gate */
83*7c478bd9Sstevel@tonic-gate void
scsi_hba_reset_notify_tear_down(struct scsi_reset_notify_entry * listp)84*7c478bd9Sstevel@tonic-gate scsi_hba_reset_notify_tear_down(struct scsi_reset_notify_entry *listp)
85*7c478bd9Sstevel@tonic-gate {
86*7c478bd9Sstevel@tonic-gate struct scsi_reset_notify_entry *p, *next;
87*7c478bd9Sstevel@tonic-gate
88*7c478bd9Sstevel@tonic-gate p = listp;
89*7c478bd9Sstevel@tonic-gate while (p) {
90*7c478bd9Sstevel@tonic-gate next = p->next;
91*7c478bd9Sstevel@tonic-gate kmem_free(p, sizeof (struct scsi_reset_notify_entry));
92*7c478bd9Sstevel@tonic-gate p = next;
93*7c478bd9Sstevel@tonic-gate }
94*7c478bd9Sstevel@tonic-gate }
95*7c478bd9Sstevel@tonic-gate
96*7c478bd9Sstevel@tonic-gate
97*7c478bd9Sstevel@tonic-gate /*
98*7c478bd9Sstevel@tonic-gate * routine to perform the notification callbacks after a reset.
99*7c478bd9Sstevel@tonic-gate * The function is entered with adapter driver mutex being held.
100*7c478bd9Sstevel@tonic-gate */
101*7c478bd9Sstevel@tonic-gate void
scsi_hba_reset_notify_callback(kmutex_t * mutex,struct scsi_reset_notify_entry ** listp)102*7c478bd9Sstevel@tonic-gate scsi_hba_reset_notify_callback(kmutex_t *mutex,
103*7c478bd9Sstevel@tonic-gate struct scsi_reset_notify_entry **listp)
104*7c478bd9Sstevel@tonic-gate {
105*7c478bd9Sstevel@tonic-gate int i, count;
106*7c478bd9Sstevel@tonic-gate struct scsi_reset_notify_entry *p;
107*7c478bd9Sstevel@tonic-gate struct notify_entry {
108*7c478bd9Sstevel@tonic-gate void (*callback)(caddr_t);
109*7c478bd9Sstevel@tonic-gate caddr_t arg;
110*7c478bd9Sstevel@tonic-gate } *list;
111*7c478bd9Sstevel@tonic-gate
112*7c478bd9Sstevel@tonic-gate if ((p = *listp) == NULL)
113*7c478bd9Sstevel@tonic-gate return;
114*7c478bd9Sstevel@tonic-gate
115*7c478bd9Sstevel@tonic-gate count = 0;
116*7c478bd9Sstevel@tonic-gate while (p != NULL) {
117*7c478bd9Sstevel@tonic-gate count++;
118*7c478bd9Sstevel@tonic-gate p = p->next;
119*7c478bd9Sstevel@tonic-gate }
120*7c478bd9Sstevel@tonic-gate
121*7c478bd9Sstevel@tonic-gate list = kmem_alloc(count * sizeof (struct notify_entry), KM_NOSLEEP);
122*7c478bd9Sstevel@tonic-gate if (list == NULL) {
123*7c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "scsi_reset_notify: kmem_alloc failed");
124*7c478bd9Sstevel@tonic-gate return;
125*7c478bd9Sstevel@tonic-gate }
126*7c478bd9Sstevel@tonic-gate
127*7c478bd9Sstevel@tonic-gate for (i = 0, p = *listp; i < count; i++, p = p->next) {
128*7c478bd9Sstevel@tonic-gate list[i].callback = p->callback;
129*7c478bd9Sstevel@tonic-gate list[i].arg = p->arg;
130*7c478bd9Sstevel@tonic-gate }
131*7c478bd9Sstevel@tonic-gate
132*7c478bd9Sstevel@tonic-gate mutex_exit(mutex);
133*7c478bd9Sstevel@tonic-gate for (i = 0; i < count; i++) {
134*7c478bd9Sstevel@tonic-gate if (list[i].callback != NULL)
135*7c478bd9Sstevel@tonic-gate (void) (*list[i].callback)(list[i].arg);
136*7c478bd9Sstevel@tonic-gate }
137*7c478bd9Sstevel@tonic-gate kmem_free(list, count * sizeof (struct notify_entry));
138*7c478bd9Sstevel@tonic-gate mutex_enter(mutex);
139*7c478bd9Sstevel@tonic-gate }
140