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 /*
23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * This module provides debugging tools for the LDoms vDisk drivers
31 * (vds and vdc).
32 */
33
34 #include <sys/mdb_modapi.h>
35
36 #include <sys/vdsk_common.h>
37
38 /*
39 */
40 int
vd_dring_entry_walk_init(mdb_walk_state_t * wsp)41 vd_dring_entry_walk_init(mdb_walk_state_t *wsp)
42 {
43 /* Must have a start addr. */
44 if (wsp->walk_addr == NULL) {
45 mdb_warn("Descriptor Ring base address required\n");
46
47 return (WALK_ERR);
48 }
49
50 return (WALK_NEXT);
51 }
52
53
54 /*
55 * Generic entry walker step routine.
56 */
57 int
vd_dring_entry_walk_step(mdb_walk_state_t * wsp)58 vd_dring_entry_walk_step(mdb_walk_state_t *wsp)
59 {
60 static int entry_count = 0;
61 int status;
62 vd_dring_entry_t dring_entry;
63
64 if (mdb_vread(&dring_entry, VD_DRING_ENTRY_SZ,
65 (uintptr_t)wsp->walk_addr) == -1) {
66 mdb_warn("failed to read vd_dring_entry_t at %p",
67 wsp->walk_addr);
68
69 return (WALK_ERR);
70 }
71
72 status = wsp->walk_callback(wsp->walk_addr, &dring_entry,
73 wsp->walk_cbdata);
74 wsp->walk_addr = (uintptr_t)(wsp->walk_addr + VD_DRING_ENTRY_SZ);
75
76 /* Check if we're at the last element */
77 if (++entry_count >= VD_DRING_LEN) {
78 /* reset counter for next call to this walker */
79 entry_count = 0;
80
81 return (WALK_DONE);
82 }
83
84 return (status);
85 }
86
87 /*
88 * MDB module linkage information:
89 */
90
91 static const mdb_walker_t walkers[] = {
92 { "vd_dring_entry", "walk vDisk public Descriptor Ring entries",
93 vd_dring_entry_walk_init, vd_dring_entry_walk_step, NULL, NULL },
94 { NULL }
95 };
96
97 static const mdb_modinfo_t modinfo = {
98 MDB_API_VERSION, NULL, walkers
99 };
100
101 const mdb_modinfo_t *
_mdb_init(void)102 _mdb_init(void)
103 {
104 return (&modinfo);
105 }
106