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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /*
27 * Implementation of "scsi_vhci_f_tpgs_tape" T10 standard based failover_ops.
28 *
29 * NOTE: for sequential devices only.
30 */
31
32 #include <sys/conf.h>
33 #include <sys/file.h>
34 #include <sys/ddi.h>
35 #include <sys/sunddi.h>
36 #include <sys/scsi/scsi.h>
37 #include <sys/scsi/adapters/scsi_vhci.h>
38 #include <sys/scsi/adapters/scsi_vhci_tpgs.h>
39
40 /* Supported device table entries. */
41 char *tpgs_tape_dev_table[] = { NULL };
42 static void tpgs_tape_init(void);
43 static int tpgs_tape_device_probe(struct scsi_device *sd,
44 struct scsi_inquiry *inq, void **ctpriv);
45
46 /* Failover module plumbing. */
47 #ifdef lint
48 #define scsi_vhci_failover_ops scsi_vhci_failover_ops_f_tpgs_tape
49 #endif /* lint */
50 struct scsi_failover_ops scsi_vhci_failover_ops = {
51 SFO_REV,
52 "f_tpgs_tape",
53 tpgs_tape_dev_table,
54 tpgs_tape_init,
55 tpgs_tape_device_probe,
56 /* The rest of the implementation comes from SFO_NAME_TPGS import */
57 };
58
59 static struct modlmisc modlmisc = {
60 &mod_miscops, "f_tpgs_tape"
61 };
62
63 static struct modlinkage modlinkage = {
64 MODREV_1, { (void *)&modlmisc, NULL }
65 };
66
67
68
69 /*
70 * External function definitions
71 */
72 extern struct scsi_failover_ops *vhci_failover_ops_by_name(char *);
73
74 int
75 _init()
76 {
77 return (mod_install(&modlinkage));
78 }
79
80 int
81 _fini()
82 {
83 return (mod_remove(&modlinkage));
84 }
85
86 int
87 _info(struct modinfo *modinfop)
88 {
89 return (mod_info(&modlinkage, modinfop));
90 }
91
92
93
94 /* ARGSUSED */
95 static int
96 tpgs_tape_device_probe(struct scsi_device *sd, struct scsi_inquiry *inq,
97 void **ctpriv)
98 {
99 int mode;
100 int state;
101 int xlf;
102 int preferred = 0;
103 int support;
104
105 VHCI_DEBUG(6, (CE_NOTE, NULL, "tpgs_tape_device_probe: vidpid %s\n",
106 inq->inq_vid));
107
108 if (inq->inq_tpgs == TPGS_FAILOVER_NONE) {
109 VHCI_DEBUG(4, (CE_WARN, NULL,
110 "!tpgs_tape_device_probe: not a standard tpgs device"));
111 support = SFO_DEVICE_PROBE_PHCI;
112 } else if (inq->inq_dtype != DTYPE_SEQUENTIAL) {
113 VHCI_DEBUG(4, (CE_NOTE, NULL,
114 "!tpgs_tape_device_probe: Detected a "
115 "Standard Asymmetric device "
116 "not yet supported\n"));
117 support = SFO_DEVICE_PROBE_PHCI;
118 } else if (vhci_tpgs_get_target_fo_mode(sd, &mode, &state, &xlf,
119 &preferred)) {
120 VHCI_DEBUG(4, (CE_WARN, NULL, "!unable to fetch fo "
121 "mode: sd(%p)", (void *) sd));
122 support = SFO_DEVICE_PROBE_PHCI;
123 } else if (inq->inq_tpgs == TPGS_FAILOVER_IMPLICIT) {
124 VHCI_DEBUG(1, (CE_NOTE, NULL,
125 "!tpgs_tape_device_probe: Detected a "
126 "Standard Asymmetric device "
127 "with implicit failover\n"));
128 support = SFO_DEVICE_PROBE_VHCI;
129 } else if (inq->inq_tpgs == TPGS_FAILOVER_EXPLICIT) {
130 VHCI_DEBUG(1, (CE_NOTE, NULL,
131 "!tpgs_tape_device_probe: Detected a "
132 "Standard Asymmetric device "
133 "with explicit failover\n"));
134 support = SFO_DEVICE_PROBE_VHCI;
135 } else if (inq->inq_tpgs == TPGS_FAILOVER_BOTH) {
136 VHCI_DEBUG(1, (CE_NOTE, NULL,
137 "!tpgs_tape_device_probe: Detected a "
138 "Standard Asymmetric device "
139 "which supports both implicit and explicit failover\n"));
140 support = SFO_DEVICE_PROBE_VHCI;
141 } else {
142 VHCI_DEBUG(1, (CE_WARN, NULL,
143 "!tpgs_tape_device_probe: "
144 "Unknown tpgs_bits: %x", inq->inq_tpgs));
145 support = SFO_DEVICE_PROBE_PHCI;
146 }
147
148 if (support == SFO_DEVICE_PROBE_VHCI) {
149 /*
150 * Policy only applies to 'client' probe, not
151 * vhci_is_dev_supported() pHCI probe. Detect difference
152 * based on ctpriv.
153 */
154 if (ctpriv &&
155 (mdi_set_lb_policy(sd->sd_dev, LOAD_BALANCE_NONE) !=
156 MDI_SUCCESS)) {
157 VHCI_DEBUG(6, (CE_NOTE, NULL, "!fail load balance none"
158 ": %s\n", inq->inq_vid));
159 support = SFO_DEVICE_PROBE_PHCI;
160 }
161 }
162 return (support);
163 }
164
165 static void
166 tpgs_tape_init(void)
167 {
168 struct scsi_failover_ops *sfo, *ssfo, clone;
169
170 /* clone SFO_NAME_SYM implementation for most things */
171 ssfo = vhci_failover_ops_by_name(SFO_NAME_TPGS);
172 if (ssfo == NULL) {
173 VHCI_DEBUG(4, (CE_NOTE, NULL, "!tpgs_tape: "
174 "can't import " SFO_NAME_SYM "\n"));
175 return;
176 }
177 sfo = &scsi_vhci_failover_ops;
178 clone = *ssfo;
179 clone.sfo_rev = sfo->sfo_rev;
180 clone.sfo_name = sfo->sfo_name;
181 clone.sfo_devices = sfo->sfo_devices;
182 clone.sfo_init = sfo->sfo_init;
183 clone.sfo_device_probe = sfo->sfo_device_probe;
184 *sfo = clone;
185 }