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mm/zsmalloc: allocate exactly size of struct zs_pool
[linux/fpc-iii.git] / drivers / acpi / tables.c
blob93b81523a2fef769bb2892b9586b7ecbd70b3031
1 /*
2 * acpi_tables.c - ACPI Boot-Time Table Parsing
3 *
4 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 */
25
26 #define pr_fmt(fmt) "ACPI: " fmt
27
28 #include <linux/init.h>
29 #include <linux/kernel.h>
30 #include <linux/smp.h>
31 #include <linux/string.h>
32 #include <linux/types.h>
33 #include <linux/irq.h>
34 #include <linux/errno.h>
35 #include <linux/acpi.h>
36 #include <linux/bootmem.h>
37
38 #define ACPI_MAX_TABLES 128
39
40 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
41 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
42
43 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
44
45 static int acpi_apic_instance __initdata;
46
47 /*
48 * Disable table checksum verification for the early stage due to the size
49 * limitation of the current x86 early mapping implementation.
50 */
51 static bool acpi_verify_table_checksum __initdata = false;
52
53 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
54 {
55 if (!header)
56 return;
57
58 switch (header->type) {
59
60 case ACPI_MADT_TYPE_LOCAL_APIC:
61 {
62 struct acpi_madt_local_apic *p =
63 (struct acpi_madt_local_apic *)header;
64 pr_info("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
65 p->processor_id, p->id,
66 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
67 }
68 break;
69
70 case ACPI_MADT_TYPE_LOCAL_X2APIC:
71 {
72 struct acpi_madt_local_x2apic *p =
73 (struct acpi_madt_local_x2apic *)header;
74 pr_info("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
75 p->local_apic_id, p->uid,
76 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
77 }
78 break;
79
80 case ACPI_MADT_TYPE_IO_APIC:
81 {
82 struct acpi_madt_io_apic *p =
83 (struct acpi_madt_io_apic *)header;
84 pr_info("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
85 p->id, p->address, p->global_irq_base);
86 }
87 break;
88
89 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
90 {
91 struct acpi_madt_interrupt_override *p =
92 (struct acpi_madt_interrupt_override *)header;
93 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
94 p->bus, p->source_irq, p->global_irq,
95 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
96 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
97 if (p->inti_flags &
98 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
99 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
100 p->inti_flags &
101 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
102 }
103 break;
104
105 case ACPI_MADT_TYPE_NMI_SOURCE:
106 {
107 struct acpi_madt_nmi_source *p =
108 (struct acpi_madt_nmi_source *)header;
109 pr_info("NMI_SRC (%s %s global_irq %d)\n",
110 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
111 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
112 p->global_irq);
113 }
114 break;
115
116 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
117 {
118 struct acpi_madt_local_apic_nmi *p =
119 (struct acpi_madt_local_apic_nmi *)header;
120 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
121 p->processor_id,
122 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
123 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
124 p->lint);
125 }
126 break;
127
128 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
129 {
130 u16 polarity, trigger;
131 struct acpi_madt_local_x2apic_nmi *p =
132 (struct acpi_madt_local_x2apic_nmi *)header;
133
134 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
135 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
136
137 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
138 p->uid,
139 mps_inti_flags_polarity[polarity],
140 mps_inti_flags_trigger[trigger],
141 p->lint);
142 }
143 break;
144
145 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
146 {
147 struct acpi_madt_local_apic_override *p =
148 (struct acpi_madt_local_apic_override *)header;
149 pr_info("LAPIC_ADDR_OVR (address[%p])\n",
150 (void *)(unsigned long)p->address);
151 }
152 break;
153
154 case ACPI_MADT_TYPE_IO_SAPIC:
155 {
156 struct acpi_madt_io_sapic *p =
157 (struct acpi_madt_io_sapic *)header;
158 pr_info("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
159 p->id, (void *)(unsigned long)p->address,
160 p->global_irq_base);
161 }
162 break;
163
164 case ACPI_MADT_TYPE_LOCAL_SAPIC:
165 {
166 struct acpi_madt_local_sapic *p =
167 (struct acpi_madt_local_sapic *)header;
168 pr_info("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
169 p->processor_id, p->id, p->eid,
170 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
171 }
172 break;
173
174 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
175 {
176 struct acpi_madt_interrupt_source *p =
177 (struct acpi_madt_interrupt_source *)header;
178 pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
179 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
180 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
181 p->type, p->id, p->eid, p->io_sapic_vector,
182 p->global_irq);
183 }
184 break;
185
186 default:
187 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
188 header->type);
189 break;
190 }
191 }
192
193 int __init
194 acpi_parse_entries(char *id, unsigned long table_size,
195 acpi_tbl_entry_handler handler,
196 struct acpi_table_header *table_header,
197 int entry_id, unsigned int max_entries)
198 {
199 struct acpi_subtable_header *entry;
200 int count = 0;
201 unsigned long table_end;
202
203 if (acpi_disabled)
204 return -ENODEV;
205
206 if (!id || !handler)
207 return -EINVAL;
208
209 if (!table_size)
210 return -EINVAL;
211
212 if (!table_header) {
213 pr_warn("%4.4s not present\n", id);
214 return -ENODEV;
215 }
216
217 table_end = (unsigned long)table_header + table_header->length;
218
219 /* Parse all entries looking for a match. */
220
221 entry = (struct acpi_subtable_header *)
222 ((unsigned long)table_header + table_size);
223
224 while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
225 table_end) {
226 if (entry->type == entry_id
227 && (!max_entries || count < max_entries)) {
228 if (handler(entry, table_end))
229 return -EINVAL;
230
231 count++;
232 }
233
234 /*
235 * If entry->length is 0, break from this loop to avoid
236 * infinite loop.
237 */
238 if (entry->length == 0) {
239 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
240 return -EINVAL;
241 }
242
243 entry = (struct acpi_subtable_header *)
244 ((unsigned long)entry + entry->length);
245 }
246
247 if (max_entries && count > max_entries) {
248 pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n",
249 id, entry_id, count - max_entries, count);
250 }
251
252 return count;
253 }
254
255 int __init
256 acpi_table_parse_entries(char *id,
257 unsigned long table_size,
258 int entry_id,
259 acpi_tbl_entry_handler handler,
260 unsigned int max_entries)
261 {
262 struct acpi_table_header *table_header = NULL;
263 acpi_size tbl_size;
264 int count;
265 u32 instance = 0;
266
267 if (acpi_disabled)
268 return -ENODEV;
269
270 if (!id || !handler)
271 return -EINVAL;
272
273 if (!strncmp(id, ACPI_SIG_MADT, 4))
274 instance = acpi_apic_instance;
275
276 acpi_get_table_with_size(id, instance, &table_header, &tbl_size);
277 if (!table_header) {
278 pr_warn("%4.4s not present\n", id);
279 return -ENODEV;
280 }
281
282 count = acpi_parse_entries(id, table_size, handler, table_header,
283 entry_id, max_entries);
284
285 early_acpi_os_unmap_memory((char *)table_header, tbl_size);
286 return count;
287 }
288
289 int __init
290 acpi_table_parse_madt(enum acpi_madt_type id,
291 acpi_tbl_entry_handler handler, unsigned int max_entries)
292 {
293 return acpi_table_parse_entries(ACPI_SIG_MADT,
294 sizeof(struct acpi_table_madt), id,
295 handler, max_entries);
296 }
297
298 /**
299 * acpi_table_parse - find table with @id, run @handler on it
300 * @id: table id to find
301 * @handler: handler to run
302 *
303 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
304 * run @handler on it.
305 *
306 * Return 0 if table found, -errno if not.
307 */
308 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
309 {
310 struct acpi_table_header *table = NULL;
311 acpi_size tbl_size;
312
313 if (acpi_disabled)
314 return -ENODEV;
315
316 if (!id || !handler)
317 return -EINVAL;
318
319 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
320 acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
321 else
322 acpi_get_table_with_size(id, 0, &table, &tbl_size);
323
324 if (table) {
325 handler(table);
326 early_acpi_os_unmap_memory(table, tbl_size);
327 return 0;
328 } else
329 return -ENODEV;
330 }
331
332 /*
333 * The BIOS is supposed to supply a single APIC/MADT,
334 * but some report two. Provide a knob to use either.
335 * (don't you wish instance 0 and 1 were not the same?)
336 */
337 static void __init check_multiple_madt(void)
338 {
339 struct acpi_table_header *table = NULL;
340 acpi_size tbl_size;
341
342 acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
343 if (table) {
344 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
345 acpi_apic_instance);
346 pr_warn("If \"acpi_apic_instance=%d\" works better, "
347 "notify linux-acpi@vger.kernel.org\n",
348 acpi_apic_instance ? 0 : 2);
349 early_acpi_os_unmap_memory(table, tbl_size);
350
351 } else
352 acpi_apic_instance = 0;
353
354 return;
355 }
356
357 /*
358 * acpi_table_init()
359 *
360 * find RSDP, find and checksum SDT/XSDT.
361 * checksum all tables, print SDT/XSDT
362 *
363 * result: sdt_entry[] is initialized
364 */
365
366 int __init acpi_table_init(void)
367 {
368 acpi_status status;
369
370 if (acpi_verify_table_checksum) {
371 pr_info("Early table checksum verification enabled\n");
372 acpi_gbl_verify_table_checksum = TRUE;
373 } else {
374 pr_info("Early table checksum verification disabled\n");
375 acpi_gbl_verify_table_checksum = FALSE;
376 }
377
378 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
379 if (ACPI_FAILURE(status))
380 return -EINVAL;
381
382 check_multiple_madt();
383 return 0;
384 }
385
386 static int __init acpi_parse_apic_instance(char *str)
387 {
388 if (!str)
389 return -EINVAL;
390
391 if (kstrtoint(str, 0, &acpi_apic_instance))
392 return -EINVAL;
393
394 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
395
396 return 0;
397 }
398
399 early_param("acpi_apic_instance", acpi_parse_apic_instance);
400
401 static int __init acpi_force_table_verification_setup(char *s)
402 {
403 acpi_verify_table_checksum = true;
404
405 return 0;
406 }
407
408 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
Linux with added FPC-III support