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