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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
41int acpi_lapic;
42unsigned int acpi_cpei_override;
43unsigned 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. */
48int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
49 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
50};
51
52enum 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 */
58int 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
71void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
72{
73 return __va(phys);
74}
75
76void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
77{
78}
79
80/* --------------------------------------------------------------------------
81 Boot-time Table Parsing
82 -------------------------------------------------------------------------- */
83
84static int available_cpus __initdata;
85struct acpi_table_madt *acpi_madt __initdata;
86static u8 has_8259;
87
88static int __init
89acpi_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
106static int __init
107acpi_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
127static int __init
128acpi_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
141static int __init
142acpi_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
154static unsigned int __initdata acpi_madt_rev;
155
156static int __init
157acpi_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
198unsigned 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
217unsigned 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
229void set_cpei_target_cpu(unsigned int cpu)
230{
231 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
232}
233#endif
234
235unsigned int get_cpei_target_cpu(void)
236{
237 return acpi_cpei_phys_cpuid;
238}
239
240static int __init
241acpi_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
261static int __init
262acpi_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
275static 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
290static 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
323static int __initdata srat_num_cpus; /* number of cpus */
324static 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))
327static struct acpi_table_slit __initdata *slit_table;
328cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
329
330static int __init
331get_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
341static int __init
342get_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 */
357void __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
372void __init
373acpi_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
399int __init
400acpi_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
441void __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 slit_distance(0, 0) = LOCAL_DISTANCE;
450 goto out;
451 }
452
453 /*
454 * MCD - This can probably be dropped now. No need for pxm ID to node ID
455 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
456 */
457 nodes_clear(node_online_map);
458 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
459 if (pxm_bit_test(i)) {
460 int nid = acpi_map_pxm_to_node(i);
461 node_set_online(nid);
462 }
463 }
464
465 /* set logical node id in memory chunk structure */
466 for (i = 0; i < num_node_memblks; i++)
467 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
468
469 /* assign memory bank numbers for each chunk on each node */
470 for_each_online_node(i) {
471 int bank;
472
473 bank = 0;
474 for (j = 0; j < num_node_memblks; j++)
475 if (node_memblk[j].nid == i)
476 node_memblk[j].bank = bank++;
477 }
478
479 /* set logical node id in cpu structure */
480 for_each_possible_early_cpu(i)
481 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
482
483 printk(KERN_INFO "Number of logical nodes in system = %d\n",
484 num_online_nodes());
485 printk(KERN_INFO "Number of memory chunks in system = %d\n",
486 num_node_memblks);
487
488 if (!slit_table) {
489 for (i = 0; i < MAX_NUMNODES; i++)
490 for (j = 0; j < MAX_NUMNODES; j++)
491 slit_distance(i, j) = i == j ?
492 LOCAL_DISTANCE : REMOTE_DISTANCE;
493 goto out;
494 }
495
496 memset(numa_slit, -1, sizeof(numa_slit));
497 for (i = 0; i < slit_table->locality_count; i++) {
498 if (!pxm_bit_test(i))
499 continue;
500 node_from = pxm_to_node(i);
501 for (j = 0; j < slit_table->locality_count; j++) {
502 if (!pxm_bit_test(j))
503 continue;
504 node_to = pxm_to_node(j);
505 slit_distance(node_from, node_to) =
506 slit_table->entry[i * slit_table->locality_count + j];
507 }
508 }
509
510#ifdef SLIT_DEBUG
511 printk("ACPI 2.0 SLIT locality table:\n");
512 for_each_online_node(i) {
513 for_each_online_node(j)
514 printk("%03d ", node_distance(i, j));
515 printk("\n");
516 }
517#endif
518out:
519 node_possible_map = node_online_map;
520}
521#endif /* CONFIG_ACPI_NUMA */
522
523/*
524 * success: return IRQ number (>=0)
525 * failure: return < 0
526 */
527int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
528{
529 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
530 return gsi;
531
532 if (has_8259 && gsi < 16)
533 return isa_irq_to_vector(gsi);
534
535 return iosapic_register_intr(gsi,
536 (polarity ==
537 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
538 IOSAPIC_POL_LOW,
539 (triggering ==
540 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
541 IOSAPIC_LEVEL);
542}
543EXPORT_SYMBOL_GPL(acpi_register_gsi);
544
545void acpi_unregister_gsi(u32 gsi)
546{
547 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
548 return;
549
550 if (has_8259 && gsi < 16)
551 return;
552
553 iosapic_unregister_intr(gsi);
554}
555EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
556
557static int __init acpi_parse_fadt(struct acpi_table_header *table)
558{
559 struct acpi_table_header *fadt_header;
560 struct acpi_table_fadt *fadt;
561
562 fadt_header = (struct acpi_table_header *)table;
563 if (fadt_header->revision != 3)
564 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
565
566 fadt = (struct acpi_table_fadt *)fadt_header;
567
568 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
569 ACPI_ACTIVE_LOW);
570 return 0;
571}
572
573int __init early_acpi_boot_init(void)
574{
575 int ret;
576
577 /*
578 * do a partial walk of MADT to determine how many CPUs
579 * we have including offline CPUs
580 */
581 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
582 printk(KERN_ERR PREFIX "Can't find MADT\n");
583 return 0;
584 }
585
586 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
587 acpi_parse_lsapic, NR_CPUS);
588 if (ret < 1)
589 printk(KERN_ERR PREFIX
590 "Error parsing MADT - no LAPIC entries\n");
591 else
592 acpi_lapic = 1;
593
594#ifdef CONFIG_SMP
595 if (available_cpus == 0) {
596 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
597 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
598 smp_boot_data.cpu_phys_id[available_cpus] =
599 hard_smp_processor_id();
600 available_cpus = 1; /* We've got at least one of these, no? */
601 }
602 smp_boot_data.cpu_count = available_cpus;
603#endif
604 /* Make boot-up look pretty */
605 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
606 total_cpus);
607
608 return 0;
609}
610
611int __init acpi_boot_init(void)
612{
613
614 /*
615 * MADT
616 * ----
617 * Parse the Multiple APIC Description Table (MADT), if exists.
618 * Note that this table provides platform SMP configuration
619 * information -- the successor to MPS tables.
620 */
621
622 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
623 printk(KERN_ERR PREFIX "Can't find MADT\n");
624 goto skip_madt;
625 }
626
627 /* Local APIC */
628
629 if (acpi_table_parse_madt
630 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
631 printk(KERN_ERR PREFIX
632 "Error parsing LAPIC address override entry\n");
633
634 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
635 < 0)
636 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
637
638 /* I/O APIC */
639
640 if (acpi_table_parse_madt
641 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
642 printk(KERN_ERR PREFIX
643 "Error parsing MADT - no IOSAPIC entries\n");
644 }
645
646 /* System-Level Interrupt Routing */
647
648 if (acpi_table_parse_madt
649 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
650 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
651 printk(KERN_ERR PREFIX
652 "Error parsing platform interrupt source entry\n");
653
654 if (acpi_table_parse_madt
655 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
656 printk(KERN_ERR PREFIX
657 "Error parsing interrupt source overrides entry\n");
658
659 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
660 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
661 skip_madt:
662
663 /*
664 * FADT says whether a legacy keyboard controller is present.
665 * The FADT also contains an SCI_INT line, by which the system
666 * gets interrupts such as power and sleep buttons. If it's not
667 * on a Legacy interrupt, it needs to be setup.
668 */
669 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
670 printk(KERN_ERR PREFIX "Can't find FADT\n");
671
672#ifdef CONFIG_ACPI_NUMA
673#ifdef CONFIG_SMP
674 if (srat_num_cpus == 0) {
675 int cpu, i = 1;
676 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
677 if (smp_boot_data.cpu_phys_id[cpu] !=
678 hard_smp_processor_id())
679 node_cpuid[i++].phys_id =
680 smp_boot_data.cpu_phys_id[cpu];
681 }
682#endif
683 build_cpu_to_node_map();
684#endif
685 return 0;
686}
687
688int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
689{
690 int tmp;
691
692 if (has_8259 && gsi < 16)
693 *irq = isa_irq_to_vector(gsi);
694 else {
695 tmp = gsi_to_irq(gsi);
696 if (tmp == -1)
697 return -1;
698 *irq = tmp;
699 }
700 return 0;
701}
702
703int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
704{
705 if (isa_irq >= 16)
706 return -1;
707 *gsi = isa_irq;
708 return 0;
709}
710
711/*
712 * ACPI based hotplug CPU support
713 */
714#ifdef CONFIG_ACPI_HOTPLUG_CPU
715int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
716{
717#ifdef CONFIG_ACPI_NUMA
718 /*
719 * We don't have cpu-only-node hotadd. But if the system equips
720 * SRAT table, pxm is already found and node is ready.
721 * So, just pxm_to_nid(pxm) is OK.
722 * This code here is for the system which doesn't have full SRAT
723 * table for possible cpus.
724 */
725 node_cpuid[cpu].phys_id = physid;
726 node_cpuid[cpu].nid = acpi_get_node(handle);
727#endif
728 return 0;
729}
730
731int additional_cpus __initdata = -1;
732
733static __init int setup_additional_cpus(char *s)
734{
735 if (s)
736 additional_cpus = simple_strtol(s, NULL, 0);
737
738 return 0;
739}
740
741early_param("additional_cpus", setup_additional_cpus);
742
743/*
744 * cpu_possible_mask should be static, it cannot change as CPUs
745 * are onlined, or offlined. The reason is per-cpu data-structures
746 * are allocated by some modules at init time, and dont expect to
747 * do this dynamically on cpu arrival/departure.
748 * cpu_present_mask on the other hand can change dynamically.
749 * In case when cpu_hotplug is not compiled, then we resort to current
750 * behaviour, which is cpu_possible == cpu_present.
751 * - Ashok Raj
752 *
753 * Three ways to find out the number of additional hotplug CPUs:
754 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
755 * - The user can overwrite it with additional_cpus=NUM
756 * - Otherwise don't reserve additional CPUs.
757 */
758__init void prefill_possible_map(void)
759{
760 int i;
761 int possible, disabled_cpus;
762
763 disabled_cpus = total_cpus - available_cpus;
764
765 if (additional_cpus == -1) {
766 if (disabled_cpus > 0)
767 additional_cpus = disabled_cpus;
768 else
769 additional_cpus = 0;
770 }
771
772 possible = available_cpus + additional_cpus;
773
774 if (possible > nr_cpu_ids)
775 possible = nr_cpu_ids;
776
777 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
778 possible, max((possible - available_cpus), 0));
779
780 for (i = 0; i < possible; i++)
781 set_cpu_possible(i, true);
782}
783
784static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
785{
786 cpumask_t tmp_map;
787 int cpu;
788
789 cpumask_complement(&tmp_map, cpu_present_mask);
790 cpu = cpumask_first(&tmp_map);
791 if (cpu >= nr_cpu_ids)
792 return -EINVAL;
793
794 acpi_map_cpu2node(handle, cpu, physid);
795
796 set_cpu_present(cpu, true);
797 ia64_cpu_to_sapicid[cpu] = physid;
798
799 acpi_processor_set_pdc(handle);
800
801 *pcpu = cpu;
802 return (0);
803}
804
805/* wrapper to silence section mismatch warning */
806int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
807 int *pcpu)
808{
809 return _acpi_map_lsapic(handle, physid, pcpu);
810}
811EXPORT_SYMBOL(acpi_map_cpu);
812
813int acpi_unmap_cpu(int cpu)
814{
815 ia64_cpu_to_sapicid[cpu] = -1;
816 set_cpu_present(cpu, false);
817
818#ifdef CONFIG_ACPI_NUMA
819 /* NUMA specific cleanup's */
820#endif
821
822 return (0);
823}
824EXPORT_SYMBOL(acpi_unmap_cpu);
825#endif /* CONFIG_ACPI_HOTPLUG_CPU */
826
827#ifdef CONFIG_ACPI_NUMA
828static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
829 void *context, void **ret)
830{
831 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
832 union acpi_object *obj;
833 struct acpi_madt_io_sapic *iosapic;
834 unsigned int gsi_base;
835 int node;
836
837 /* Only care about objects w/ a method that returns the MADT */
838 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
839 return AE_OK;
840
841 if (!buffer.length || !buffer.pointer)
842 return AE_OK;
843
844 obj = buffer.pointer;
845 if (obj->type != ACPI_TYPE_BUFFER ||
846 obj->buffer.length < sizeof(*iosapic)) {
847 kfree(buffer.pointer);
848 return AE_OK;
849 }
850
851 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
852
853 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
854 kfree(buffer.pointer);
855 return AE_OK;
856 }
857
858 gsi_base = iosapic->global_irq_base;
859
860 kfree(buffer.pointer);
861
862 /* OK, it's an IOSAPIC MADT entry; associate it with a node */
863 node = acpi_get_node(handle);
864 if (node == NUMA_NO_NODE || !node_online(node) ||
865 cpumask_empty(cpumask_of_node(node)))
866 return AE_OK;
867
868 /* We know a gsi to node mapping! */
869 map_iosapic_to_node(gsi_base, node);
870 return AE_OK;
871}
872
873static int __init
874acpi_map_iosapics (void)
875{
876 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
877 return 0;
878}
879
880fs_initcall(acpi_map_iosapics);
881#endif /* CONFIG_ACPI_NUMA */
882
883int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
884{
885 int err;
886
887 if ((err = iosapic_init(phys_addr, gsi_base)))
888 return err;
889
890#ifdef CONFIG_ACPI_NUMA
891 acpi_map_iosapic(handle, 0, NULL, NULL);
892#endif /* CONFIG_ACPI_NUMA */
893
894 return 0;
895}
896
897EXPORT_SYMBOL(acpi_register_ioapic);
898
899int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
900{
901 return iosapic_remove(gsi_base);
902}
903
904EXPORT_SYMBOL(acpi_unregister_ioapic);
905
906/*
907 * acpi_suspend_lowlevel() - save kernel state and suspend.
908 *
909 * TBD when IA64 starts to support suspend...
910 */
911int acpi_suspend_lowlevel(void) { return 0; }