1/*
2 *  blacklist.c
3 *
4 *  Check to see if the given machine has a known bad ACPI BIOS
5 *  or if the BIOS is too old.
6 *
7 *  Copyright (C) 2004 Len Brown <len.brown@intel.com>
8 *  Copyright (C) 2002 Andy Grover <andrew.grover@intel.com>
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 *  This program is free software; you can redistribute it and/or modify
13 *  it under the terms of the GNU General Public License as published by
14 *  the Free Software Foundation; either version 2 of the License, or (at
15 *  your option) any later version.
16 *
17 *  This program is distributed in the hope that it will be useful, but
18 *  WITHOUT ANY WARRANTY; without even the implied warranty of
19 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
20 *  General Public License for more details.
21 *
22 *  You should have received a copy of the GNU General Public License along
23 *  with this program; if not, write to the Free Software Foundation, Inc.,
24 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 */
28
29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/acpi.h>
33#include <acpi/acpi_bus.h>
34#include <linux/dmi.h>
35
36enum acpi_blacklist_predicates {
37	all_versions,
38	less_than_or_equal,
39	equal,
40	greater_than_or_equal,
41};
42
43struct acpi_blacklist_item {
44	char oem_id[7];
45	char oem_table_id[9];
46	u32 oem_revision;
47	char *table;
48	enum acpi_blacklist_predicates oem_revision_predicate;
49	char *reason;
50	u32 is_critical_error;
51};
52
53/*
54 * POLICY: If *anything* doesn't work, put it on the blacklist.
55 *	   If they are critical errors, mark it critical, and abort driver load.
56 */
57static struct acpi_blacklist_item acpi_blacklist[] __initdata = {
58	/* Compaq Presario 1700 */
59	{"PTLTD ", "  DSDT  ", 0x06040000, ACPI_SIG_DSDT, less_than_or_equal,
60	 "Multiple problems", 1},
61	/* Sony FX120, FX140, FX150? */
62	{"SONY  ", "U0      ", 0x20010313, ACPI_SIG_DSDT, less_than_or_equal,
63	 "ACPI driver problem", 1},
64	/* Compaq Presario 800, Insyde BIOS */
65	{"INT440", "SYSFexxx", 0x00001001, ACPI_SIG_DSDT, less_than_or_equal,
66	 "Does not use _REG to protect EC OpRegions", 1},
67	/* IBM 600E - _ADR should return 7, but it returns 1 */
68	{"IBM   ", "TP600E  ", 0x00000105, ACPI_SIG_DSDT, less_than_or_equal,
69	 "Incorrect _ADR", 1},
70	{"ASUS\0\0", "P2B-S   ", 0, ACPI_SIG_DSDT, all_versions,
71	 "Bogus PCI routing", 1},
72
73	{""}
74};
75
76#if	CONFIG_ACPI_BLACKLIST_YEAR
77
78static int __init blacklist_by_year(void)
79{
80	int year = dmi_get_year(DMI_BIOS_DATE);
81	/* Doesn't exist? Likely an old system */
82	if (year == -1) {
83		printk(KERN_ERR PREFIX "no DMI BIOS year, "
84			"acpi=force is required to enable ACPI\n" );
85		return 1;
86	}
87	/* 0? Likely a buggy new BIOS */
88	if (year == 0) {
89		printk(KERN_ERR PREFIX "DMI BIOS year==0, "
90			"assuming ACPI-capable machine\n" );
91		return 0;
92	}
93	if (year < CONFIG_ACPI_BLACKLIST_YEAR) {
94		printk(KERN_ERR PREFIX "BIOS age (%d) fails cutoff (%d), "
95		       "acpi=force is required to enable ACPI\n",
96		       year, CONFIG_ACPI_BLACKLIST_YEAR);
97		return 1;
98	}
99	return 0;
100}
101#else
102static inline int blacklist_by_year(void)
103{
104	return 0;
105}
106#endif
107
108int __init acpi_blacklisted(void)
109{
110	int i = 0;
111	int blacklisted = 0;
112	struct acpi_table_header table_header;
113
114	while (acpi_blacklist[i].oem_id[0] != '\0') {
115		if (acpi_get_table_header(acpi_blacklist[i].table, 0, &table_header)) {
116			i++;
117			continue;
118		}
119
120		if (strncmp(acpi_blacklist[i].oem_id, table_header.oem_id, 6)) {
121			i++;
122			continue;
123		}
124
125		if (strncmp
126		    (acpi_blacklist[i].oem_table_id, table_header.oem_table_id,
127		     8)) {
128			i++;
129			continue;
130		}
131
132		if ((acpi_blacklist[i].oem_revision_predicate == all_versions)
133		    || (acpi_blacklist[i].oem_revision_predicate ==
134			less_than_or_equal
135			&& table_header.oem_revision <=
136			acpi_blacklist[i].oem_revision)
137		    || (acpi_blacklist[i].oem_revision_predicate ==
138			greater_than_or_equal
139			&& table_header.oem_revision >=
140			acpi_blacklist[i].oem_revision)
141		    || (acpi_blacklist[i].oem_revision_predicate == equal
142			&& table_header.oem_revision ==
143			acpi_blacklist[i].oem_revision)) {
144
145			printk(KERN_ERR PREFIX
146			       "Vendor \"%6.6s\" System \"%8.8s\" "
147			       "Revision 0x%x has a known ACPI BIOS problem.\n",
148			       acpi_blacklist[i].oem_id,
149			       acpi_blacklist[i].oem_table_id,
150			       acpi_blacklist[i].oem_revision);
151
152			printk(KERN_ERR PREFIX
153			       "Reason: %s. This is a %s error\n",
154			       acpi_blacklist[i].reason,
155			       (acpi_blacklist[i].
156				is_critical_error ? "non-recoverable" :
157				"recoverable"));
158
159			blacklisted = acpi_blacklist[i].is_critical_error;
160			break;
161		} else {
162			i++;
163		}
164	}
165
166	blacklisted += blacklist_by_year();
167
168	return blacklisted;
169}
170