summaryrefslogtreecommitdiffstats
path: root/qemu/roms/ipxe/src/drivers/nvs/nvsvpd.c
blob: 33148d5b9736091d863cc3d74391c94b72e775f2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
/*
 * Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <stdio.h>
#include <errno.h>
#include <ipxe/nvs.h>
#include <ipxe/pci.h>
#include <ipxe/pcivpd.h>
#include <ipxe/nvo.h>
#include <ipxe/nvsvpd.h>

/** @file
 *
 * Non-Volatile Storage using Vital Product Data
 *
 */

/**
 * Read from VPD field
 *
 * @v nvs		NVS device
 * @v field		VPD field descriptor
 * @v data		Data buffer
 * @v len		Length of data buffer
 * @ret rc		Return status code
 */
static int nvs_vpd_read ( struct nvs_device *nvs, unsigned int field,
			  void *data, size_t len ) {
	struct nvs_vpd_device *nvsvpd =
		container_of ( nvs, struct nvs_vpd_device, nvs );
	struct pci_device *pci = nvsvpd->vpd.pci;
	unsigned int address;
	size_t max_len;
	int rc;

	/* Allow reading non-existent field */
	if ( len == 0 )
		return 0;

	/* Locate VPD field */
	if ( ( rc = pci_vpd_find ( &nvsvpd->vpd, field, &address,
				   &max_len ) ) != 0 ) {
		DBGC ( pci, PCI_FMT " NVS VPD could not locate field "
		       PCI_VPD_FIELD_FMT ": %s\n", PCI_ARGS ( pci ),
		       PCI_VPD_FIELD_ARGS ( field ), strerror ( rc ) );
		return rc;
	}

	/* Sanity check */
	if ( len > max_len ) {
		DBGC ( pci, PCI_FMT " NVS VPD cannot read %#02zx bytes "
		       "beyond field " PCI_VPD_FIELD_FMT " at [%04x,%04zx)\n",
		       PCI_ARGS ( pci ), len, PCI_VPD_FIELD_ARGS ( field ),
		       address, ( address + max_len ) );
		return -ENXIO;
	}

	/* Read from VPD field */
	if ( ( rc = pci_vpd_read ( &nvsvpd->vpd, address, data, len ) ) != 0 ) {
		DBGC ( pci, PCI_FMT " NVS VPD could not read field "
		       PCI_VPD_FIELD_FMT " at [%04x,%04zx): %s\n",
		       PCI_ARGS ( pci ), PCI_VPD_FIELD_ARGS ( field ),
		       address, ( address + len ), strerror ( rc ) );
		return rc;
	}

	return 0;
}

/**
 * Write to VPD field
 *
 * @v nvs		NVS device
 * @v field		VPD field descriptor
 * @v data		Data buffer
 * @v len		Length of data buffer
 * @ret rc		Return status code
 */
static int nvs_vpd_write ( struct nvs_device *nvs, unsigned int field,
			   const void *data, size_t len ) {
	struct nvs_vpd_device *nvsvpd =
		container_of ( nvs, struct nvs_vpd_device, nvs );
	struct pci_device *pci = nvsvpd->vpd.pci;
	unsigned int address;
	size_t max_len;
	int rc;

	/* Locate VPD field */
	if ( ( rc = pci_vpd_find ( &nvsvpd->vpd, field, &address,
				   &max_len ) ) != 0 ) {
		DBGC ( pci, PCI_FMT " NVS VPD could not locate field "
		       PCI_VPD_FIELD_FMT ": %s\n", PCI_ARGS ( pci ),
		       PCI_VPD_FIELD_ARGS ( field ), strerror ( rc ) );
		return rc;
	}

	/* Sanity check */
	if ( len > max_len ) {
		DBGC ( pci, PCI_FMT " NVS VPD cannot write %#02zx bytes "
		       "beyond field " PCI_VPD_FIELD_FMT " at [%04x,%04zx)\n",
		       PCI_ARGS ( pci ), len, PCI_VPD_FIELD_ARGS ( field ),
		       address, ( address + max_len ) );
		return -ENXIO;
	}

	/* Write field */
	if ( ( rc = pci_vpd_write ( &nvsvpd->vpd, address, data,
				    len ) ) != 0 ) {
		DBGC ( pci, PCI_FMT " NVS VPD could not write field "
		       PCI_VPD_FIELD_FMT " at [%04x,%04zx): %s\n",
		       PCI_ARGS ( pci ), PCI_VPD_FIELD_ARGS ( field ),
		       address, ( address + len ), strerror ( rc ) );
		return rc;
	}

	return 0;
}

/**
 * Resize VPD field
 *
 * @v nvs		NVS device
 * @v field		VPD field descriptor
 * @v data		Data buffer
 * @v len		Length of data buffer
 * @ret rc		Return status code
 */
static int nvs_vpd_resize ( struct nvs_device *nvs, unsigned int field,
			    size_t len ) {
	struct nvs_vpd_device *nvsvpd =
		container_of ( nvs, struct nvs_vpd_device, nvs );
	struct pci_device *pci = nvsvpd->vpd.pci;
	unsigned int address;
	int rc;

	/* Resize field */
	if ( ( rc = pci_vpd_resize ( &nvsvpd->vpd, field, len,
				     &address ) ) != 0 ) {
		DBGC ( pci, PCI_FMT " NVS VPD could not resize field "
		       PCI_VPD_FIELD_FMT " to %#02zx bytes: %s\n",
		       PCI_ARGS ( pci ), PCI_VPD_FIELD_ARGS ( field ),
		       len, strerror ( rc ) );
		return rc;
	}

	return 0;
}

/**
 * Initialise NVS VPD device
 *
 * @v nvsvpd		NVS VPD device
 * @v pci		PCI device
 * @ret rc		Return status code
 */
int nvs_vpd_init ( struct nvs_vpd_device *nvsvpd, struct pci_device *pci ) {
	int rc;

	/* Initialise VPD device */
	if ( ( rc = pci_vpd_init ( &nvsvpd->vpd, pci ) ) != 0 ) {
		DBGC ( pci, PCI_FMT " NVS could not initialise "
		       "VPD: %s\n", PCI_ARGS ( pci ), strerror ( rc ) );
		return rc;
	}

	/* Initialise NVS device */
	nvsvpd->nvs.read = nvs_vpd_read;
	nvsvpd->nvs.write = nvs_vpd_write;

	return 0;
}

/**
 * Resize non-volatile option storage within NVS VPD device
 *
 * @v nvo		Non-volatile options block
 * @v len		New length
 * @ret rc		Return status code
 */
static int nvs_vpd_nvo_resize ( struct nvo_block *nvo, size_t len ) {
	int rc;

	/* Resize VPD field */
	if ( ( rc = nvs_vpd_resize ( nvo->nvs, nvo->address, len ) ) != 0 )
		return rc;

	return 0;
}

/**
 * Initialise non-volatile option storage within NVS VPD device
 *
 * @v nvsvpd		NVS VPD device
 * @v field		VPD field descriptor
 * @v nvo		Non-volatile options block
 * @v refcnt		Containing object reference counter, or NULL
 */
void nvs_vpd_nvo_init ( struct nvs_vpd_device *nvsvpd, unsigned int field,
			struct nvo_block *nvo, struct refcnt *refcnt ) {
	struct pci_device *pci = nvsvpd->vpd.pci;
	unsigned int address;
	size_t len;
	int rc;

	/* Locate VPD field, if present */
	if ( ( rc = pci_vpd_find ( &nvsvpd->vpd, field, &address,
				   &len ) ) != 0 ) {
		DBGC ( pci, PCI_FMT " NVS VPD field " PCI_VPD_FIELD_FMT
		       " not present; assuming empty\n",
		       PCI_ARGS ( pci ), PCI_VPD_FIELD_ARGS ( field ) );
		len = 0;
	}

	/* Initialise non-volatile options block */
	nvo_init ( nvo, &nvsvpd->nvs, field, len, nvs_vpd_nvo_resize, refcnt );
}