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 2009 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#include    "sun_sas.h"
28
29/*
30 * Discover an HBA node with  mtaching path.
31 * The di_node_t argument should be the root of the device tree.
32 * This routine assumes the locks have been taken
33 */
34static int
35match_smhba_sas_hba(di_node_t node, void *arg)
36{
37	int *propData, rval;
38	walkarg_t *wa = (walkarg_t *)arg;
39	char	*devpath, fulldevpath[MAXPATHLEN];
40
41	/* Skip stub(instance -1) nodes */
42	if (IS_STUB_NODE(node)) {
43		return (DI_WALK_CONTINUE);
44	}
45
46	rval = di_prop_lookup_ints(DDI_DEV_T_ANY, node,
47	    "sm-hba-supported", &propData);
48	if (rval < 0) {
49		return (DI_WALK_CONTINUE);
50	} else {
51		if ((devpath = di_devfs_path(node)) == NULL) {
52			/* still continue to see if there is matching one. */
53			return (DI_WALK_CONTINUE);
54		}
55		(void) snprintf(fulldevpath, MAXPATHLEN, "%s%s", DEVICES_DIR,
56		    devpath);
57
58		if ((strstr(fulldevpath, wa->devpath)) != NULL) {
59			/* add the hba to the hba list */
60			if (devtree_get_one_hba(node) ==
61			    HBA_STATUS_OK) {
62				/* succeed to refresh the adapater. */
63				*wa->flag = B_TRUE;
64			}
65			/* Found a node. No need to walk any more. */
66			di_devfs_path_free(devpath);
67			return (DI_WALK_TERMINATE);
68		}
69		di_devfs_path_free(devpath);
70	}
71
72	return (DI_WALK_CONTINUE);
73}
74
75/*
76 * Refreshes information about an HBA
77 *
78 * Note: This routine holds the locks in write mode
79 *       during most of the processing, and as such, will cause
80 *	 all other threads to block on entry into the library
81 *	 until the refresh is complete.  An optimization would be
82 *       to put fine-grain locking in for the open_handle structures.
83 */
84void
85Sun_sasRefreshInformation(HBA_HANDLE handle)
86{
87	const char		    ROUTINE[] = "Sun_sasRefreshInformation";
88	struct sun_sas_hba	    *hba_ptr;
89	struct open_handle	    *oHandle;
90	di_node_t		    root;
91	hrtime_t		    start;
92	hrtime_t		    end;
93	double			    duration;
94	walkarg_t		    wa;
95
96	/* take a lock for hbas and handles during rerfresh. */
97	lock(&all_hbas_lock);
98	lock(&open_handles_lock);
99
100	oHandle = RetrieveOpenHandle(handle);
101	if (oHandle == NULL) {
102		log(LOG_DEBUG, ROUTINE, "Invalid handle %08lx", handle);
103		unlock(&open_handles_lock);
104		unlock(&all_hbas_lock);
105		return;
106	}
107
108	/* now we know the associated hba exists in the global list. */
109	start = gethrtime();
110	/* Grab device tree */
111	if ((root = di_init("/", DINFOCACHE)) == DI_NODE_NIL) {
112		log(LOG_DEBUG, ROUTINE,
113		    "Unable to load device tree for reason \"%s\"",
114		    strerror(errno));
115		unlock(&open_handles_lock);
116		unlock(&all_hbas_lock);
117		return;
118	}
119
120	end = gethrtime();
121	duration = end - start;
122	duration /= HR_SECOND;
123	log(LOG_DEBUG, ROUTINE, "Device tree init took "
124	    "%.6f seconds", duration);
125
126	hba_ptr = RetrieveHandle(oHandle->adapterIndex);
127	wa.devpath = hba_ptr->device_path;
128	wa.flag = (boolean_t *)calloc(1, sizeof (boolean_t));
129	*wa.flag = B_FALSE;
130
131	/* found the matching hba node and refresh hba ports and targets. */
132	if (di_walk_node(root, DI_WALK_SIBFIRST, &wa,
133	    match_smhba_sas_hba) != 0) {
134		log(LOG_DEBUG, ROUTINE, "di_walk_node failed.");
135		unlock(&open_handles_lock);
136		unlock(&all_hbas_lock);
137		S_FREE(wa.flag);
138		di_fini(root);
139		return;
140	}
141
142	if (*wa.flag != B_TRUE) {
143		/* no matching HBA. */
144		log(LOG_DEBUG, ROUTINE, "No matching HBA found.");
145		unlock(&open_handles_lock);
146		unlock(&all_hbas_lock);
147		S_FREE(wa.flag);
148		di_fini(root);
149		return;
150	}
151
152	S_FREE(wa.flag);
153
154	di_fini(root);
155
156	/* All done, release the locks */
157	unlock(&open_handles_lock);
158	unlock(&all_hbas_lock);
159}
160