xref: /openbmc/linux/arch/ia64/kernel/acpi.c (revision 2985bed6)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  acpi.c - Architecture-Specific Low-Level ACPI Support
4  *
5  *  Copyright (C) 1999 VA Linux Systems
6  *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
7  *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
8  *	David Mosberger-Tang <davidm@hpl.hp.com>
9  *  Copyright (C) 2000 Intel Corp.
10  *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
11  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
12  *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
13  *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
14  *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
15  *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
16  */
17 
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/smp.h>
23 #include <linux/string.h>
24 #include <linux/types.h>
25 #include <linux/irq.h>
26 #include <linux/acpi.h>
27 #include <linux/efi.h>
28 #include <linux/mmzone.h>
29 #include <linux/nodemask.h>
30 #include <linux/slab.h>
31 #include <acpi/processor.h>
32 #include <asm/io.h>
33 #include <asm/iosapic.h>
34 #include <asm/page.h>
35 #include <asm/numa.h>
36 #include <asm/sal.h>
37 #include <asm/cyclone.h>
38 
39 #define PREFIX			"ACPI: "
40 
41 int acpi_lapic;
42 unsigned int acpi_cpei_override;
43 unsigned int acpi_cpei_phys_cpuid;
44 
45 #define ACPI_MAX_PLATFORM_INTERRUPTS	256
46 
47 /* Array to record platform interrupt vectors for generic interrupt routing. */
48 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
49 	[0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
50 };
51 
52 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
53 
54 /*
55  * Interrupt routing API for device drivers.  Provides interrupt vector for
56  * a generic platform event.  Currently only CPEI is implemented.
57  */
58 int acpi_request_vector(u32 int_type)
59 {
60 	int vector = -1;
61 
62 	if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
63 		/* corrected platform error interrupt */
64 		vector = platform_intr_list[int_type];
65 	} else
66 		printk(KERN_ERR
67 		       "acpi_request_vector(): invalid interrupt type\n");
68 	return vector;
69 }
70 
71 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
72 {
73 	return __va(phys);
74 }
75 
76 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
77 {
78 }
79 
80 /* --------------------------------------------------------------------------
81                             Boot-time Table Parsing
82    -------------------------------------------------------------------------- */
83 
84 static int available_cpus __initdata;
85 struct acpi_table_madt *acpi_madt __initdata;
86 static u8 has_8259;
87 
88 static int __init
89 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
90 			  const unsigned long end)
91 {
92 	struct acpi_madt_local_apic_override *lapic;
93 
94 	lapic = (struct acpi_madt_local_apic_override *)header;
95 
96 	if (BAD_MADT_ENTRY(lapic, end))
97 		return -EINVAL;
98 
99 	if (lapic->address) {
100 		iounmap(ipi_base_addr);
101 		ipi_base_addr = ioremap(lapic->address, 0);
102 	}
103 	return 0;
104 }
105 
106 static int __init
107 acpi_parse_lsapic(union acpi_subtable_headers *header, const unsigned long end)
108 {
109 	struct acpi_madt_local_sapic *lsapic;
110 
111 	lsapic = (struct acpi_madt_local_sapic *)header;
112 
113 	/*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
114 
115 	if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
116 #ifdef CONFIG_SMP
117 		smp_boot_data.cpu_phys_id[available_cpus] =
118 		    (lsapic->id << 8) | lsapic->eid;
119 #endif
120 		++available_cpus;
121 	}
122 
123 	total_cpus++;
124 	return 0;
125 }
126 
127 static int __init
128 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
129 {
130 	struct acpi_madt_local_apic_nmi *lacpi_nmi;
131 
132 	lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
133 
134 	if (BAD_MADT_ENTRY(lacpi_nmi, end))
135 		return -EINVAL;
136 
137 	/* TBD: Support lapic_nmi entries */
138 	return 0;
139 }
140 
141 static int __init
142 acpi_parse_iosapic(union acpi_subtable_headers * header, const unsigned long end)
143 {
144 	struct acpi_madt_io_sapic *iosapic;
145 
146 	iosapic = (struct acpi_madt_io_sapic *)header;
147 
148 	if (BAD_MADT_ENTRY(iosapic, end))
149 		return -EINVAL;
150 
151 	return iosapic_init(iosapic->address, iosapic->global_irq_base);
152 }
153 
154 static unsigned int __initdata acpi_madt_rev;
155 
156 static int __init
157 acpi_parse_plat_int_src(union acpi_subtable_headers * header,
158 			const unsigned long end)
159 {
160 	struct acpi_madt_interrupt_source *plintsrc;
161 	int vector;
162 
163 	plintsrc = (struct acpi_madt_interrupt_source *)header;
164 
165 	if (BAD_MADT_ENTRY(plintsrc, end))
166 		return -EINVAL;
167 
168 	/*
169 	 * Get vector assignment for this interrupt, set attributes,
170 	 * and program the IOSAPIC routing table.
171 	 */
172 	vector = iosapic_register_platform_intr(plintsrc->type,
173 						plintsrc->global_irq,
174 						plintsrc->io_sapic_vector,
175 						plintsrc->eid,
176 						plintsrc->id,
177 						((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
178 						 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
179 						IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
180 						((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
181 						 ACPI_MADT_TRIGGER_EDGE) ?
182 						IOSAPIC_EDGE : IOSAPIC_LEVEL);
183 
184 	platform_intr_list[plintsrc->type] = vector;
185 	if (acpi_madt_rev > 1) {
186 		acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
187 	}
188 
189 	/*
190 	 * Save the physical id, so we can check when its being removed
191 	 */
192 	acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
193 
194 	return 0;
195 }
196 
197 #ifdef CONFIG_HOTPLUG_CPU
198 unsigned int can_cpei_retarget(void)
199 {
200 	extern int cpe_vector;
201 	extern unsigned int force_cpei_retarget;
202 
203 	/*
204 	 * Only if CPEI is supported and the override flag
205 	 * is present, otherwise return that its re-targettable
206 	 * if we are in polling mode.
207 	 */
208 	if (cpe_vector > 0) {
209 		if (acpi_cpei_override || force_cpei_retarget)
210 			return 1;
211 		else
212 			return 0;
213 	}
214 	return 1;
215 }
216 
217 unsigned int is_cpu_cpei_target(unsigned int cpu)
218 {
219 	unsigned int logical_id;
220 
221 	logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
222 
223 	if (logical_id == cpu)
224 		return 1;
225 	else
226 		return 0;
227 }
228 
229 void set_cpei_target_cpu(unsigned int cpu)
230 {
231 	acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
232 }
233 #endif
234 
235 unsigned int get_cpei_target_cpu(void)
236 {
237 	return acpi_cpei_phys_cpuid;
238 }
239 
240 static int __init
241 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
242 		       const unsigned long end)
243 {
244 	struct acpi_madt_interrupt_override *p;
245 
246 	p = (struct acpi_madt_interrupt_override *)header;
247 
248 	if (BAD_MADT_ENTRY(p, end))
249 		return -EINVAL;
250 
251 	iosapic_override_isa_irq(p->source_irq, p->global_irq,
252 				 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
253 				  ACPI_MADT_POLARITY_ACTIVE_LOW) ?
254 				 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
255 				 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
256 				 ACPI_MADT_TRIGGER_LEVEL) ?
257 				 IOSAPIC_LEVEL : IOSAPIC_EDGE);
258 	return 0;
259 }
260 
261 static int __init
262 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
263 {
264 	struct acpi_madt_nmi_source *nmi_src;
265 
266 	nmi_src = (struct acpi_madt_nmi_source *)header;
267 
268 	if (BAD_MADT_ENTRY(nmi_src, end))
269 		return -EINVAL;
270 
271 	/* TBD: Support nimsrc entries */
272 	return 0;
273 }
274 
275 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
276 {
277 	if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
278 
279 		/*
280 		 * Unfortunately ITC_DRIFT is not yet part of the
281 		 * official SAL spec, so the ITC_DRIFT bit is not
282 		 * set by the BIOS on this hardware.
283 		 */
284 		sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
285 
286 		cyclone_setup();
287 	}
288 }
289 
290 static int __init acpi_parse_madt(struct acpi_table_header *table)
291 {
292 	acpi_madt = (struct acpi_table_madt *)table;
293 
294 	acpi_madt_rev = acpi_madt->header.revision;
295 
296 	/* remember the value for reference after free_initmem() */
297 #ifdef CONFIG_ITANIUM
298 	has_8259 = 1;		/* Firmware on old Itanium systems is broken */
299 #else
300 	has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
301 #endif
302 	iosapic_system_init(has_8259);
303 
304 	/* Get base address of IPI Message Block */
305 
306 	if (acpi_madt->address)
307 		ipi_base_addr = ioremap(acpi_madt->address, 0);
308 
309 	printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
310 
311 	acpi_madt_oem_check(acpi_madt->header.oem_id,
312 			    acpi_madt->header.oem_table_id);
313 
314 	return 0;
315 }
316 
317 #ifdef CONFIG_ACPI_NUMA
318 
319 #undef SLIT_DEBUG
320 
321 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
322 
323 static int __initdata srat_num_cpus;	/* number of cpus */
324 static u32 pxm_flag[PXM_FLAG_LEN];
325 #define pxm_bit_set(bit)	(set_bit(bit,(void *)pxm_flag))
326 #define pxm_bit_test(bit)	(test_bit(bit,(void *)pxm_flag))
327 static struct acpi_table_slit __initdata *slit_table;
328 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
329 
330 static int __init
331 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
332 {
333 	int pxm;
334 
335 	pxm = pa->proximity_domain_lo;
336 	if (acpi_srat_revision >= 2)
337 		pxm += pa->proximity_domain_hi[0] << 8;
338 	return pxm;
339 }
340 
341 static int __init
342 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
343 {
344 	int pxm;
345 
346 	pxm = ma->proximity_domain;
347 	if (acpi_srat_revision <= 1)
348 		pxm &= 0xff;
349 
350 	return pxm;
351 }
352 
353 /*
354  * ACPI 2.0 SLIT (System Locality Information Table)
355  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
356  */
357 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
358 {
359 	u32 len;
360 
361 	len = sizeof(struct acpi_table_header) + 8
362 	    + slit->locality_count * slit->locality_count;
363 	if (slit->header.length != len) {
364 		printk(KERN_ERR
365 		       "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
366 		       len, slit->header.length);
367 		return;
368 	}
369 	slit_table = slit;
370 }
371 
372 void __init
373 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
374 {
375 	int pxm;
376 
377 	if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
378 		return;
379 
380 	if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
381 		printk_once(KERN_WARNING
382 			    "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
383 			    ARRAY_SIZE(node_cpuid));
384 		return;
385 	}
386 	pxm = get_processor_proximity_domain(pa);
387 
388 	/* record this node in proximity bitmap */
389 	pxm_bit_set(pxm);
390 
391 	node_cpuid[srat_num_cpus].phys_id =
392 	    (pa->apic_id << 8) | (pa->local_sapic_eid);
393 	/* nid should be overridden as logical node id later */
394 	node_cpuid[srat_num_cpus].nid = pxm;
395 	cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
396 	srat_num_cpus++;
397 }
398 
399 int __init
400 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
401 {
402 	unsigned long paddr, size;
403 	int pxm;
404 	struct node_memblk_s *p, *q, *pend;
405 
406 	pxm = get_memory_proximity_domain(ma);
407 
408 	/* fill node memory chunk structure */
409 	paddr = ma->base_address;
410 	size = ma->length;
411 
412 	/* Ignore disabled entries */
413 	if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
414 		return -1;
415 
416 	if (num_node_memblks >= NR_NODE_MEMBLKS) {
417 		pr_err("NUMA: too many memblk ranges\n");
418 		return -EINVAL;
419 	}
420 
421 	/* record this node in proximity bitmap */
422 	pxm_bit_set(pxm);
423 
424 	/* Insertion sort based on base address */
425 	pend = &node_memblk[num_node_memblks];
426 	for (p = &node_memblk[0]; p < pend; p++) {
427 		if (paddr < p->start_paddr)
428 			break;
429 	}
430 	if (p < pend) {
431 		for (q = pend - 1; q >= p; q--)
432 			*(q + 1) = *q;
433 	}
434 	p->start_paddr = paddr;
435 	p->size = size;
436 	p->nid = pxm;
437 	num_node_memblks++;
438 	return 0;
439 }
440 
441 void __init acpi_numa_fixup(void)
442 {
443 	int i, j, node_from, node_to;
444 
445 	/* If there's no SRAT, fix the phys_id and mark node 0 online */
446 	if (srat_num_cpus == 0) {
447 		node_set_online(0);
448 		node_cpuid[0].phys_id = hard_smp_processor_id();
449 		return;
450 	}
451 
452 	/*
453 	 * MCD - This can probably be dropped now.  No need for pxm ID to node ID
454 	 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
455 	 */
456 	nodes_clear(node_online_map);
457 	for (i = 0; i < MAX_PXM_DOMAINS; i++) {
458 		if (pxm_bit_test(i)) {
459 			int nid = acpi_map_pxm_to_node(i);
460 			node_set_online(nid);
461 		}
462 	}
463 
464 	/* set logical node id in memory chunk structure */
465 	for (i = 0; i < num_node_memblks; i++)
466 		node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
467 
468 	/* assign memory bank numbers for each chunk on each node */
469 	for_each_online_node(i) {
470 		int bank;
471 
472 		bank = 0;
473 		for (j = 0; j < num_node_memblks; j++)
474 			if (node_memblk[j].nid == i)
475 				node_memblk[j].bank = bank++;
476 	}
477 
478 	/* set logical node id in cpu structure */
479 	for_each_possible_early_cpu(i)
480 		node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
481 
482 	printk(KERN_INFO "Number of logical nodes in system = %d\n",
483 	       num_online_nodes());
484 	printk(KERN_INFO "Number of memory chunks in system = %d\n",
485 	       num_node_memblks);
486 
487 	if (!slit_table) {
488 		for (i = 0; i < MAX_NUMNODES; i++)
489 			for (j = 0; j < MAX_NUMNODES; j++)
490 				slit_distance(i, j) = i == j ?
491 					LOCAL_DISTANCE : REMOTE_DISTANCE;
492 		return;
493 	}
494 
495 	memset(numa_slit, -1, sizeof(numa_slit));
496 	for (i = 0; i < slit_table->locality_count; i++) {
497 		if (!pxm_bit_test(i))
498 			continue;
499 		node_from = pxm_to_node(i);
500 		for (j = 0; j < slit_table->locality_count; j++) {
501 			if (!pxm_bit_test(j))
502 				continue;
503 			node_to = pxm_to_node(j);
504 			slit_distance(node_from, node_to) =
505 			    slit_table->entry[i * slit_table->locality_count + j];
506 		}
507 	}
508 
509 #ifdef SLIT_DEBUG
510 	printk("ACPI 2.0 SLIT locality table:\n");
511 	for_each_online_node(i) {
512 		for_each_online_node(j)
513 		    printk("%03d ", node_distance(i, j));
514 		printk("\n");
515 	}
516 #endif
517 }
518 #endif				/* CONFIG_ACPI_NUMA */
519 
520 /*
521  * success: return IRQ number (>=0)
522  * failure: return < 0
523  */
524 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
525 {
526 	if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
527 		return gsi;
528 
529 	if (has_8259 && gsi < 16)
530 		return isa_irq_to_vector(gsi);
531 
532 	return iosapic_register_intr(gsi,
533 				     (polarity ==
534 				      ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
535 				     IOSAPIC_POL_LOW,
536 				     (triggering ==
537 				      ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
538 				     IOSAPIC_LEVEL);
539 }
540 EXPORT_SYMBOL_GPL(acpi_register_gsi);
541 
542 void acpi_unregister_gsi(u32 gsi)
543 {
544 	if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
545 		return;
546 
547 	if (has_8259 && gsi < 16)
548 		return;
549 
550 	iosapic_unregister_intr(gsi);
551 }
552 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
553 
554 static int __init acpi_parse_fadt(struct acpi_table_header *table)
555 {
556 	struct acpi_table_header *fadt_header;
557 	struct acpi_table_fadt *fadt;
558 
559 	fadt_header = (struct acpi_table_header *)table;
560 	if (fadt_header->revision != 3)
561 		return -ENODEV;	/* Only deal with ACPI 2.0 FADT */
562 
563 	fadt = (struct acpi_table_fadt *)fadt_header;
564 
565 	acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
566 				 ACPI_ACTIVE_LOW);
567 	return 0;
568 }
569 
570 int __init early_acpi_boot_init(void)
571 {
572 	int ret;
573 
574 	/*
575 	 * do a partial walk of MADT to determine how many CPUs
576 	 * we have including offline CPUs
577 	 */
578 	if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
579 		printk(KERN_ERR PREFIX "Can't find MADT\n");
580 		return 0;
581 	}
582 
583 	ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
584 		acpi_parse_lsapic, NR_CPUS);
585 	if (ret < 1)
586 		printk(KERN_ERR PREFIX
587 		       "Error parsing MADT - no LAPIC entries\n");
588 	else
589 		acpi_lapic = 1;
590 
591 #ifdef CONFIG_SMP
592 	if (available_cpus == 0) {
593 		printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
594 		printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
595 		smp_boot_data.cpu_phys_id[available_cpus] =
596 		    hard_smp_processor_id();
597 		available_cpus = 1;	/* We've got at least one of these, no? */
598 	}
599 	smp_boot_data.cpu_count = available_cpus;
600 #endif
601 	/* Make boot-up look pretty */
602 	printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
603 	       total_cpus);
604 
605 	return 0;
606 }
607 
608 int __init acpi_boot_init(void)
609 {
610 
611 	/*
612 	 * MADT
613 	 * ----
614 	 * Parse the Multiple APIC Description Table (MADT), if exists.
615 	 * Note that this table provides platform SMP configuration
616 	 * information -- the successor to MPS tables.
617 	 */
618 
619 	if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
620 		printk(KERN_ERR PREFIX "Can't find MADT\n");
621 		goto skip_madt;
622 	}
623 
624 	/* Local APIC */
625 
626 	if (acpi_table_parse_madt
627 	    (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
628 		printk(KERN_ERR PREFIX
629 		       "Error parsing LAPIC address override entry\n");
630 
631 	if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
632 	    < 0)
633 		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
634 
635 	/* I/O APIC */
636 
637 	if (acpi_table_parse_madt
638 	    (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
639 		printk(KERN_ERR PREFIX
640 		       "Error parsing MADT - no IOSAPIC entries\n");
641 	}
642 
643 	/* System-Level Interrupt Routing */
644 
645 	if (acpi_table_parse_madt
646 	    (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
647 	     ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
648 		printk(KERN_ERR PREFIX
649 		       "Error parsing platform interrupt source entry\n");
650 
651 	if (acpi_table_parse_madt
652 	    (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
653 		printk(KERN_ERR PREFIX
654 		       "Error parsing interrupt source overrides entry\n");
655 
656 	if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
657 		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
658       skip_madt:
659 
660 	/*
661 	 * FADT says whether a legacy keyboard controller is present.
662 	 * The FADT also contains an SCI_INT line, by which the system
663 	 * gets interrupts such as power and sleep buttons.  If it's not
664 	 * on a Legacy interrupt, it needs to be setup.
665 	 */
666 	if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
667 		printk(KERN_ERR PREFIX "Can't find FADT\n");
668 
669 #ifdef CONFIG_ACPI_NUMA
670 #ifdef CONFIG_SMP
671 	if (srat_num_cpus == 0) {
672 		int cpu, i = 1;
673 		for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
674 			if (smp_boot_data.cpu_phys_id[cpu] !=
675 			    hard_smp_processor_id())
676 				node_cpuid[i++].phys_id =
677 				    smp_boot_data.cpu_phys_id[cpu];
678 	}
679 #endif
680 	build_cpu_to_node_map();
681 #endif
682 	return 0;
683 }
684 
685 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
686 {
687 	int tmp;
688 
689 	if (has_8259 && gsi < 16)
690 		*irq = isa_irq_to_vector(gsi);
691 	else {
692 		tmp = gsi_to_irq(gsi);
693 		if (tmp == -1)
694 			return -1;
695 		*irq = tmp;
696 	}
697 	return 0;
698 }
699 
700 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
701 {
702 	if (isa_irq >= 16)
703 		return -1;
704 	*gsi = isa_irq;
705 	return 0;
706 }
707 
708 /*
709  *  ACPI based hotplug CPU support
710  */
711 #ifdef CONFIG_ACPI_HOTPLUG_CPU
712 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
713 {
714 #ifdef CONFIG_ACPI_NUMA
715 	/*
716 	 * We don't have cpu-only-node hotadd. But if the system equips
717 	 * SRAT table, pxm is already found and node is ready.
718   	 * So, just pxm_to_nid(pxm) is OK.
719 	 * This code here is for the system which doesn't have full SRAT
720   	 * table for possible cpus.
721 	 */
722 	node_cpuid[cpu].phys_id = physid;
723 	node_cpuid[cpu].nid = acpi_get_node(handle);
724 #endif
725 	return 0;
726 }
727 
728 int additional_cpus __initdata = -1;
729 
730 static __init int setup_additional_cpus(char *s)
731 {
732 	if (s)
733 		additional_cpus = simple_strtol(s, NULL, 0);
734 
735 	return 0;
736 }
737 
738 early_param("additional_cpus", setup_additional_cpus);
739 
740 /*
741  * cpu_possible_mask should be static, it cannot change as CPUs
742  * are onlined, or offlined. The reason is per-cpu data-structures
743  * are allocated by some modules at init time, and dont expect to
744  * do this dynamically on cpu arrival/departure.
745  * cpu_present_mask on the other hand can change dynamically.
746  * In case when cpu_hotplug is not compiled, then we resort to current
747  * behaviour, which is cpu_possible == cpu_present.
748  * - Ashok Raj
749  *
750  * Three ways to find out the number of additional hotplug CPUs:
751  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
752  * - The user can overwrite it with additional_cpus=NUM
753  * - Otherwise don't reserve additional CPUs.
754  */
755 __init void prefill_possible_map(void)
756 {
757 	int i;
758 	int possible, disabled_cpus;
759 
760 	disabled_cpus = total_cpus - available_cpus;
761 
762  	if (additional_cpus == -1) {
763  		if (disabled_cpus > 0)
764 			additional_cpus = disabled_cpus;
765  		else
766 			additional_cpus = 0;
767  	}
768 
769 	possible = available_cpus + additional_cpus;
770 
771 	if (possible > nr_cpu_ids)
772 		possible = nr_cpu_ids;
773 
774 	printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
775 		possible, max((possible - available_cpus), 0));
776 
777 	for (i = 0; i < possible; i++)
778 		set_cpu_possible(i, true);
779 }
780 
781 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
782 {
783 	cpumask_t tmp_map;
784 	int cpu;
785 
786 	cpumask_complement(&tmp_map, cpu_present_mask);
787 	cpu = cpumask_first(&tmp_map);
788 	if (cpu >= nr_cpu_ids)
789 		return -EINVAL;
790 
791 	acpi_map_cpu2node(handle, cpu, physid);
792 
793 	set_cpu_present(cpu, true);
794 	ia64_cpu_to_sapicid[cpu] = physid;
795 
796 	acpi_processor_set_pdc(handle);
797 
798 	*pcpu = cpu;
799 	return (0);
800 }
801 
802 /* wrapper to silence section mismatch warning */
803 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
804 		       int *pcpu)
805 {
806 	return _acpi_map_lsapic(handle, physid, pcpu);
807 }
808 EXPORT_SYMBOL(acpi_map_cpu);
809 
810 int acpi_unmap_cpu(int cpu)
811 {
812 	ia64_cpu_to_sapicid[cpu] = -1;
813 	set_cpu_present(cpu, false);
814 
815 #ifdef CONFIG_ACPI_NUMA
816 	/* NUMA specific cleanup's */
817 #endif
818 
819 	return (0);
820 }
821 EXPORT_SYMBOL(acpi_unmap_cpu);
822 #endif				/* CONFIG_ACPI_HOTPLUG_CPU */
823 
824 #ifdef CONFIG_ACPI_NUMA
825 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
826 				    void *context, void **ret)
827 {
828 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
829 	union acpi_object *obj;
830 	struct acpi_madt_io_sapic *iosapic;
831 	unsigned int gsi_base;
832 	int node;
833 
834 	/* Only care about objects w/ a method that returns the MADT */
835 	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
836 		return AE_OK;
837 
838 	if (!buffer.length || !buffer.pointer)
839 		return AE_OK;
840 
841 	obj = buffer.pointer;
842 	if (obj->type != ACPI_TYPE_BUFFER ||
843 	    obj->buffer.length < sizeof(*iosapic)) {
844 		kfree(buffer.pointer);
845 		return AE_OK;
846 	}
847 
848 	iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
849 
850 	if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
851 		kfree(buffer.pointer);
852 		return AE_OK;
853 	}
854 
855 	gsi_base = iosapic->global_irq_base;
856 
857 	kfree(buffer.pointer);
858 
859 	/* OK, it's an IOSAPIC MADT entry; associate it with a node */
860 	node = acpi_get_node(handle);
861 	if (node == NUMA_NO_NODE || !node_online(node) ||
862 	    cpumask_empty(cpumask_of_node(node)))
863 		return AE_OK;
864 
865 	/* We know a gsi to node mapping! */
866 	map_iosapic_to_node(gsi_base, node);
867 	return AE_OK;
868 }
869 
870 static int __init
871 acpi_map_iosapics (void)
872 {
873 	acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
874 	return 0;
875 }
876 
877 fs_initcall(acpi_map_iosapics);
878 #endif				/* CONFIG_ACPI_NUMA */
879 
880 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
881 {
882 	int err;
883 
884 	if ((err = iosapic_init(phys_addr, gsi_base)))
885 		return err;
886 
887 #ifdef CONFIG_ACPI_NUMA
888 	acpi_map_iosapic(handle, 0, NULL, NULL);
889 #endif				/* CONFIG_ACPI_NUMA */
890 
891 	return 0;
892 }
893 
894 EXPORT_SYMBOL(acpi_register_ioapic);
895 
896 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
897 {
898 	return iosapic_remove(gsi_base);
899 }
900 
901 EXPORT_SYMBOL(acpi_unregister_ioapic);
902 
903 /*
904  * acpi_suspend_lowlevel() - save kernel state and suspend.
905  *
906  * TBD when when IA64 starts to support suspend...
907  */
908 int acpi_suspend_lowlevel(void) { return 0; }
909