1 /*
2  * Copyright (c) 2008-2010 Rui Paulo
3  * Copyright (c) 2006 Marcel Moolenaar
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27 
28 #include <sys/cdefs.h>
29 
30 #include <sys/param.h>
31 #include <sys/disk.h>
32 #include <stand.h>
33 
34 #include <libzfs.h>
35 
36 #include <efi.h>
37 #include <efilib.h>
38 
39 #include "efizfs.h"
40 
41 static zfsinfo_list_t zfsinfo;
42 
43 uint64_t pool_guid;
44 
45 zfsinfo_list_t *
efizfs_get_zfsinfo_list(void)46 efizfs_get_zfsinfo_list(void)
47 {
48 	return (&zfsinfo);
49 }
50 
51 EFI_HANDLE
efizfs_get_handle_by_guid(uint64_t guid)52 efizfs_get_handle_by_guid(uint64_t guid)
53 {
54 	zfsinfo_t *zi;
55 
56 	STAILQ_FOREACH(zi, &zfsinfo, zi_link) {
57 		if (zi->zi_pool_guid == guid) {
58 			return (zi->zi_handle);
59 		}
60 	}
61 	return (NULL);
62 }
63 
64 bool
efizfs_get_guid_by_handle(EFI_HANDLE handle,uint64_t * guid)65 efizfs_get_guid_by_handle(EFI_HANDLE handle, uint64_t *guid)
66 {
67 	zfsinfo_t *zi;
68 
69 	if (guid == NULL)
70 		return (false);
71 	STAILQ_FOREACH(zi, &zfsinfo, zi_link) {
72 		if (zi->zi_handle == handle) {
73 			*guid = zi->zi_pool_guid;
74 			return (true);
75 		}
76 	}
77 	return (false);
78 }
79 
80 static void
insert_zfs(EFI_HANDLE handle,uint64_t guid)81 insert_zfs(EFI_HANDLE handle, uint64_t guid)
82 {
83         zfsinfo_t *zi;
84 
85         zi = malloc(sizeof(zfsinfo_t));
86         zi->zi_handle = handle;
87         zi->zi_pool_guid = guid;
88         STAILQ_INSERT_TAIL(&zfsinfo, zi, zi_link);
89 }
90 
91 void
efi_zfs_probe(void)92 efi_zfs_probe(void)
93 {
94 	pdinfo_list_t *hdi;
95 	pdinfo_t *hd, *pd = NULL;
96 	char devname[SPECNAMELEN + 1];
97         uint64_t guid;
98 
99 	hdi = efiblk_get_pdinfo_list(&efipart_hddev);
100 	STAILQ_INIT(&zfsinfo);
101 
102 	/*
103 	 * Find the handle for the boot device. The boot1 did find the
104 	 * device with loader binary, now we need to search for the
105 	 * same device and if it is part of the zfs pool, we record the
106 	 * pool GUID for currdev setup.
107 	 */
108 	STAILQ_FOREACH(hd, hdi, pd_link) {
109 		STAILQ_FOREACH(pd, &hd->pd_part, pd_link) {
110 
111 			snprintf(devname, sizeof(devname), "%s%dp%d:",
112 			    efipart_hddev.dv_name, hd->pd_unit, pd->pd_unit);
113 
114                         if (zfs_probe_dev(devname, &guid) == 0) {
115                                 insert_zfs(pd->pd_handle, guid);
116 
117                                 if (efi_zfs_is_preferred(pd->pd_handle))
118                                         pool_guid = guid;
119                         }
120 
121 		}
122 	}
123 }
124