summaryrefslogtreecommitdiffstats
path: root/platform-intel.c
blob: 03e4ba79608ba694d6e80c1733bbf1ffaba80d8b (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
235
236
237
238
239
/*
 * Intel(R) Matrix Storage Manager hardware and firmware support routines
 *
 * Copyright (C) 2008 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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 St - Fifth Floor, Boston, MA 02110-1301 USA.
 */
#include "mdadm.h"
#include "platform-intel.h"
#include "probe_roms.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>

void free_sys_dev(struct sys_dev **list)
{
	while (*list) {
		struct sys_dev *next = (*list)->next;

		if ((*list)->path)
			free((*list)->path);
		free(*list);
		*list = next;
	}
}

struct sys_dev *find_driver_devices(const char *bus, const char *driver)
{
	/* search sysfs for devices driven by 'driver' */
	char path[256];
	char link[256];
	char *c;
	DIR *driver_dir;
	struct dirent *de;
	struct sys_dev *head = NULL;
	struct sys_dev *list = NULL;

	sprintf(path, "/sys/bus/%s/drivers/%s", bus, driver);
	driver_dir = opendir(path);
	if (!driver_dir)
		return NULL;
	for (de = readdir(driver_dir); de; de = readdir(driver_dir)) {
		/* is 'de' a device? check that the 'subsystem' link exists and
		 * that its target matches 'bus'
		 */
		sprintf(path, "/sys/bus/%s/drivers/%s/%s/subsystem",
			bus, driver, de->d_name);
		if (readlink(path, link, sizeof(link)) < 0)
			continue;
		c = strrchr(link, '/');
		if (!c)
			continue;
		if (strncmp(bus, c+1, strlen(bus)) != 0)
			continue;

		/* start / add list entry */
		if (!head) {
			head = malloc(sizeof(*head));
			list = head;
		} else {
			list->next = malloc(sizeof(*head));
			list = list->next;
		}

		if (!list) {
			free_sys_dev(&head);
			break;
		}

		/* generate canonical path name for the device */
		sprintf(path, "/sys/bus/%s/drivers/%s/%s",
			bus, driver, de->d_name);
		list->path = canonicalize_file_name(path);
		list->next = NULL;
	}

	return head;
}

__u16 devpath_to_vendor(const char *dev_path)
{
	char path[strlen(dev_path) + strlen("/vendor") + 1];
	char vendor[7];
	int fd;
	__u16 id = 0xffff;
	int n;

	sprintf(path, "%s/vendor", dev_path);

	fd = open(path, O_RDONLY);
	if (fd < 0)
		return 0xffff;

	n = read(fd, vendor, sizeof(vendor));
	if (n == sizeof(vendor)) {
		vendor[n - 1] = '\0';
		id = strtoul(vendor, NULL, 16);
	}
	close(fd);

	return id;
}

static int platform_has_intel_ahci(void)
{
	struct sys_dev *devices = find_driver_devices("pci", "ahci");
	struct sys_dev *dev;
	int ret = 0;

	for (dev = devices; dev; dev = dev->next)
		if (devpath_to_vendor(dev->path) == 0x8086) {
			ret = 1;
			break;
		}

	free_sys_dev(&devices);

	return ret;
}


static struct imsm_orom imsm_orom;
static int scan(const void *start, const void *end)
{
	int offset;
	const struct imsm_orom *imsm_mem;
	int len = (end - start);

	for (offset = 0; offset < len; offset += 4) {
		imsm_mem = start + offset;
		if (memcmp(imsm_mem->signature, "$VER", 4) == 0) {
			imsm_orom = *imsm_mem;
			return 1;
		}
	}

	return 0;
}

const struct imsm_orom *find_imsm_orom(void)
{
	static int populated = 0;

	/* it's static data so we only need to read it once */
	if (populated)
		return &imsm_orom;

	if (!platform_has_intel_ahci())
		return NULL;

	/* scan option-rom memory looking for an imsm signature */
	if (probe_roms_init() != 0)
		return NULL;
	probe_roms();
	populated = scan_adapter_roms(scan);
	probe_roms_exit();

	if (populated)
		return &imsm_orom;
	return NULL;
}

char *devt_to_devpath(dev_t dev)
{
	char device[40];

	sprintf(device, "/sys/dev/block/%d:%d/device", major(dev), minor(dev));
	return canonicalize_file_name(device);
}

static char *diskfd_to_devpath(int fd)
{
	/* return the device path for a disk, return NULL on error or fd
	 * refers to a partition
	 */
	struct stat st;

	if (fstat(fd, &st) != 0)
		return NULL;
	if (!S_ISBLK(st.st_mode))
		return NULL;

	return devt_to_devpath(st.st_rdev);
}

int path_attached_to_hba(const char *disk_path, const char *hba_path)
{
	int rc;

	if (!disk_path || !hba_path)
		return 0;

	if (strncmp(disk_path, hba_path, strlen(hba_path)) == 0)
		rc = 1;
	else
		rc = 0;

	return rc;
}

int devt_attached_to_hba(dev_t dev, const char *hba_path)
{
	char *disk_path = devt_to_devpath(dev);
	int rc = path_attached_to_hba(disk_path, hba_path);

	if (disk_path)
		free(disk_path);

	return rc;
}

int disk_attached_to_hba(int fd, const char *hba_path)
{
	char *disk_path = diskfd_to_devpath(fd);
	int rc = path_attached_to_hba(disk_path, hba_path);

	if (disk_path)
		free(disk_path);

	return rc;
}