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Linux/arch/ia64/kernel/acpi.c

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  1 /*
  2  *  acpi.c - Architecture-Specific Low-Level ACPI Support
  3  *
  4  *  Copyright (C) 1999 VA Linux Systems
  5  *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
  6  *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
  7  *      David Mosberger-Tang <davidm@hpl.hp.com>
  8  *  Copyright (C) 2000 Intel Corp.
  9  *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
 10  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 11  *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
 12  *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
 13  *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
 14  *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
 15  *
 16  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 17  *
 18  *  This program is free software; you can redistribute it and/or modify
 19  *  it under the terms of the GNU General Public License as published by
 20  *  the Free Software Foundation; either version 2 of the License, or
 21  *  (at your option) any later version.
 22  *
 23  *  This program is distributed in the hope that it will be useful,
 24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 26  *  GNU General Public License for more details.
 27  *
 28  *  You should have received a copy of the GNU General Public License
 29  *  along with this program; if not, write to the Free Software
 30  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 31  *
 32  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 33  */
 34 
 35 #include <linux/module.h>
 36 #include <linux/init.h>
 37 #include <linux/kernel.h>
 38 #include <linux/sched.h>
 39 #include <linux/smp.h>
 40 #include <linux/string.h>
 41 #include <linux/types.h>
 42 #include <linux/irq.h>
 43 #include <linux/acpi.h>
 44 #include <linux/efi.h>
 45 #include <linux/mmzone.h>
 46 #include <linux/nodemask.h>
 47 #include <linux/slab.h>
 48 #include <acpi/processor.h>
 49 #include <asm/io.h>
 50 #include <asm/iosapic.h>
 51 #include <asm/machvec.h>
 52 #include <asm/page.h>
 53 #include <asm/numa.h>
 54 #include <asm/sal.h>
 55 #include <asm/cyclone.h>
 56 
 57 #define PREFIX                  "ACPI: "
 58 
 59 int acpi_lapic;
 60 unsigned int acpi_cpei_override;
 61 unsigned int acpi_cpei_phys_cpuid;
 62 
 63 unsigned long acpi_wakeup_address = 0;
 64 
 65 #ifdef CONFIG_IA64_GENERIC
 66 static unsigned long __init acpi_find_rsdp(void)
 67 {
 68         unsigned long rsdp_phys = 0;
 69 
 70         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 71                 rsdp_phys = efi.acpi20;
 72         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 73                 printk(KERN_WARNING PREFIX
 74                        "v1.0/r0.71 tables no longer supported\n");
 75         return rsdp_phys;
 76 }
 77 
 78 const char __init *
 79 acpi_get_sysname(void)
 80 {
 81         unsigned long rsdp_phys;
 82         struct acpi_table_rsdp *rsdp;
 83         struct acpi_table_xsdt *xsdt;
 84         struct acpi_table_header *hdr;
 85 #ifdef CONFIG_INTEL_IOMMU
 86         u64 i, nentries;
 87 #endif
 88 
 89         rsdp_phys = acpi_find_rsdp();
 90         if (!rsdp_phys) {
 91                 printk(KERN_ERR
 92                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
 93                 return "dig";
 94         }
 95 
 96         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
 97         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
 98                 printk(KERN_ERR
 99                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
100                 return "dig";
101         }
102 
103         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
104         hdr = &xsdt->header;
105         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
106                 printk(KERN_ERR
107                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
108                 return "dig";
109         }
110 
111         if (!strcmp(hdr->oem_id, "HP")) {
112                 return "hpzx1";
113         } else if (!strcmp(hdr->oem_id, "SGI")) {
114                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
115                         return "uv";
116                 else
117                         return "sn2";
118         }
119 
120 #ifdef CONFIG_INTEL_IOMMU
121         /* Look for Intel IOMMU */
122         nentries = (hdr->length - sizeof(*hdr)) /
123                          sizeof(xsdt->table_offset_entry[0]);
124         for (i = 0; i < nentries; i++) {
125                 hdr = __va(xsdt->table_offset_entry[i]);
126                 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
127                         sizeof(ACPI_SIG_DMAR) - 1) == 0)
128                         return "dig_vtd";
129         }
130 #endif
131 
132         return "dig";
133 }
134 #endif /* CONFIG_IA64_GENERIC */
135 
136 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
137 
138 /* Array to record platform interrupt vectors for generic interrupt routing. */
139 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
140         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
141 };
142 
143 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
144 
145 /*
146  * Interrupt routing API for device drivers.  Provides interrupt vector for
147  * a generic platform event.  Currently only CPEI is implemented.
148  */
149 int acpi_request_vector(u32 int_type)
150 {
151         int vector = -1;
152 
153         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
154                 /* corrected platform error interrupt */
155                 vector = platform_intr_list[int_type];
156         } else
157                 printk(KERN_ERR
158                        "acpi_request_vector(): invalid interrupt type\n");
159         return vector;
160 }
161 
162 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
163 {
164         return __va(phys);
165 }
166 
167 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
168 {
169 }
170 
171 /* --------------------------------------------------------------------------
172                             Boot-time Table Parsing
173    -------------------------------------------------------------------------- */
174 
175 static int available_cpus __initdata;
176 struct acpi_table_madt *acpi_madt __initdata;
177 static u8 has_8259;
178 
179 static int __init
180 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
181                           const unsigned long end)
182 {
183         struct acpi_madt_local_apic_override *lapic;
184 
185         lapic = (struct acpi_madt_local_apic_override *)header;
186 
187         if (BAD_MADT_ENTRY(lapic, end))
188                 return -EINVAL;
189 
190         if (lapic->address) {
191                 iounmap(ipi_base_addr);
192                 ipi_base_addr = ioremap(lapic->address, 0);
193         }
194         return 0;
195 }
196 
197 static int __init
198 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
199 {
200         struct acpi_madt_local_sapic *lsapic;
201 
202         lsapic = (struct acpi_madt_local_sapic *)header;
203 
204         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
205 
206         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
207 #ifdef CONFIG_SMP
208                 smp_boot_data.cpu_phys_id[available_cpus] =
209                     (lsapic->id << 8) | lsapic->eid;
210 #endif
211                 ++available_cpus;
212         }
213 
214         total_cpus++;
215         return 0;
216 }
217 
218 static int __init
219 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
220 {
221         struct acpi_madt_local_apic_nmi *lacpi_nmi;
222 
223         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
224 
225         if (BAD_MADT_ENTRY(lacpi_nmi, end))
226                 return -EINVAL;
227 
228         /* TBD: Support lapic_nmi entries */
229         return 0;
230 }
231 
232 static int __init
233 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
234 {
235         struct acpi_madt_io_sapic *iosapic;
236 
237         iosapic = (struct acpi_madt_io_sapic *)header;
238 
239         if (BAD_MADT_ENTRY(iosapic, end))
240                 return -EINVAL;
241 
242         return iosapic_init(iosapic->address, iosapic->global_irq_base);
243 }
244 
245 static unsigned int __initdata acpi_madt_rev;
246 
247 static int __init
248 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
249                         const unsigned long end)
250 {
251         struct acpi_madt_interrupt_source *plintsrc;
252         int vector;
253 
254         plintsrc = (struct acpi_madt_interrupt_source *)header;
255 
256         if (BAD_MADT_ENTRY(plintsrc, end))
257                 return -EINVAL;
258 
259         /*
260          * Get vector assignment for this interrupt, set attributes,
261          * and program the IOSAPIC routing table.
262          */
263         vector = iosapic_register_platform_intr(plintsrc->type,
264                                                 plintsrc->global_irq,
265                                                 plintsrc->io_sapic_vector,
266                                                 plintsrc->eid,
267                                                 plintsrc->id,
268                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
269                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
270                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
271                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
272                                                  ACPI_MADT_TRIGGER_EDGE) ?
273                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
274 
275         platform_intr_list[plintsrc->type] = vector;
276         if (acpi_madt_rev > 1) {
277                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
278         }
279 
280         /*
281          * Save the physical id, so we can check when its being removed
282          */
283         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
284 
285         return 0;
286 }
287 
288 #ifdef CONFIG_HOTPLUG_CPU
289 unsigned int can_cpei_retarget(void)
290 {
291         extern int cpe_vector;
292         extern unsigned int force_cpei_retarget;
293 
294         /*
295          * Only if CPEI is supported and the override flag
296          * is present, otherwise return that its re-targettable
297          * if we are in polling mode.
298          */
299         if (cpe_vector > 0) {
300                 if (acpi_cpei_override || force_cpei_retarget)
301                         return 1;
302                 else
303                         return 0;
304         }
305         return 1;
306 }
307 
308 unsigned int is_cpu_cpei_target(unsigned int cpu)
309 {
310         unsigned int logical_id;
311 
312         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
313 
314         if (logical_id == cpu)
315                 return 1;
316         else
317                 return 0;
318 }
319 
320 void set_cpei_target_cpu(unsigned int cpu)
321 {
322         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
323 }
324 #endif
325 
326 unsigned int get_cpei_target_cpu(void)
327 {
328         return acpi_cpei_phys_cpuid;
329 }
330 
331 static int __init
332 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
333                        const unsigned long end)
334 {
335         struct acpi_madt_interrupt_override *p;
336 
337         p = (struct acpi_madt_interrupt_override *)header;
338 
339         if (BAD_MADT_ENTRY(p, end))
340                 return -EINVAL;
341 
342         iosapic_override_isa_irq(p->source_irq, p->global_irq,
343                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
344                                   ACPI_MADT_POLARITY_ACTIVE_LOW) ?
345                                  IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
346                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
347                                  ACPI_MADT_TRIGGER_LEVEL) ?
348                                  IOSAPIC_LEVEL : IOSAPIC_EDGE);
349         return 0;
350 }
351 
352 static int __init
353 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
354 {
355         struct acpi_madt_nmi_source *nmi_src;
356 
357         nmi_src = (struct acpi_madt_nmi_source *)header;
358 
359         if (BAD_MADT_ENTRY(nmi_src, end))
360                 return -EINVAL;
361 
362         /* TBD: Support nimsrc entries */
363         return 0;
364 }
365 
366 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
367 {
368         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
369 
370                 /*
371                  * Unfortunately ITC_DRIFT is not yet part of the
372                  * official SAL spec, so the ITC_DRIFT bit is not
373                  * set by the BIOS on this hardware.
374                  */
375                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
376 
377                 cyclone_setup();
378         }
379 }
380 
381 static int __init acpi_parse_madt(struct acpi_table_header *table)
382 {
383         acpi_madt = (struct acpi_table_madt *)table;
384 
385         acpi_madt_rev = acpi_madt->header.revision;
386 
387         /* remember the value for reference after free_initmem() */
388 #ifdef CONFIG_ITANIUM
389         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
390 #else
391         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
392 #endif
393         iosapic_system_init(has_8259);
394 
395         /* Get base address of IPI Message Block */
396 
397         if (acpi_madt->address)
398                 ipi_base_addr = ioremap(acpi_madt->address, 0);
399 
400         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
401 
402         acpi_madt_oem_check(acpi_madt->header.oem_id,
403                             acpi_madt->header.oem_table_id);
404 
405         return 0;
406 }
407 
408 #ifdef CONFIG_ACPI_NUMA
409 
410 #undef SLIT_DEBUG
411 
412 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
413 
414 static int __initdata srat_num_cpus;    /* number of cpus */
415 static u32 pxm_flag[PXM_FLAG_LEN];
416 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
417 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
418 static struct acpi_table_slit __initdata *slit_table;
419 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
420 
421 static int __init
422 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
423 {
424         int pxm;
425 
426         pxm = pa->proximity_domain_lo;
427         if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
428                 pxm += pa->proximity_domain_hi[0] << 8;
429         return pxm;
430 }
431 
432 static int __init
433 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
434 {
435         int pxm;
436 
437         pxm = ma->proximity_domain;
438         if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
439                 pxm &= 0xff;
440 
441         return pxm;
442 }
443 
444 /*
445  * ACPI 2.0 SLIT (System Locality Information Table)
446  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
447  */
448 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
449 {
450         u32 len;
451 
452         len = sizeof(struct acpi_table_header) + 8
453             + slit->locality_count * slit->locality_count;
454         if (slit->header.length != len) {
455                 printk(KERN_ERR
456                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
457                        len, slit->header.length);
458                 return;
459         }
460         slit_table = slit;
461 }
462 
463 void __init
464 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
465 {
466         int pxm;
467 
468         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
469                 return;
470 
471         if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
472                 printk_once(KERN_WARNING
473                             "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
474                             ARRAY_SIZE(node_cpuid));
475                 return;
476         }
477         pxm = get_processor_proximity_domain(pa);
478 
479         /* record this node in proximity bitmap */
480         pxm_bit_set(pxm);
481 
482         node_cpuid[srat_num_cpus].phys_id =
483             (pa->apic_id << 8) | (pa->local_sapic_eid);
484         /* nid should be overridden as logical node id later */
485         node_cpuid[srat_num_cpus].nid = pxm;
486         cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
487         srat_num_cpus++;
488 }
489 
490 int __init
491 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
492 {
493         unsigned long paddr, size;
494         int pxm;
495         struct node_memblk_s *p, *q, *pend;
496 
497         pxm = get_memory_proximity_domain(ma);
498 
499         /* fill node memory chunk structure */
500         paddr = ma->base_address;
501         size = ma->length;
502 
503         /* Ignore disabled entries */
504         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
505                 return -1;
506 
507         if (num_node_memblks >= NR_NODE_MEMBLKS) {
508                 pr_err("NUMA: too many memblk ranges\n");
509                 return -EINVAL;
510         }
511 
512         /* record this node in proximity bitmap */
513         pxm_bit_set(pxm);
514 
515         /* Insertion sort based on base address */
516         pend = &node_memblk[num_node_memblks];
517         for (p = &node_memblk[0]; p < pend; p++) {
518                 if (paddr < p->start_paddr)
519                         break;
520         }
521         if (p < pend) {
522                 for (q = pend - 1; q >= p; q--)
523                         *(q + 1) = *q;
524         }
525         p->start_paddr = paddr;
526         p->size = size;
527         p->nid = pxm;
528         num_node_memblks++;
529         return 0;
530 }
531 
532 void __init acpi_numa_fixup(void)
533 {
534         int i, j, node_from, node_to;
535 
536         /* If there's no SRAT, fix the phys_id and mark node 0 online */
537         if (srat_num_cpus == 0) {
538                 node_set_online(0);
539                 node_cpuid[0].phys_id = hard_smp_processor_id();
540                 return;
541         }
542 
543         /*
544          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
545          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
546          */
547         nodes_clear(node_online_map);
548         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
549                 if (pxm_bit_test(i)) {
550                         int nid = acpi_map_pxm_to_node(i);
551                         node_set_online(nid);
552                 }
553         }
554 
555         /* set logical node id in memory chunk structure */
556         for (i = 0; i < num_node_memblks; i++)
557                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
558 
559         /* assign memory bank numbers for each chunk on each node */
560         for_each_online_node(i) {
561                 int bank;
562 
563                 bank = 0;
564                 for (j = 0; j < num_node_memblks; j++)
565                         if (node_memblk[j].nid == i)
566                                 node_memblk[j].bank = bank++;
567         }
568 
569         /* set logical node id in cpu structure */
570         for_each_possible_early_cpu(i)
571                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
572 
573         printk(KERN_INFO "Number of logical nodes in system = %d\n",
574                num_online_nodes());
575         printk(KERN_INFO "Number of memory chunks in system = %d\n",
576                num_node_memblks);
577 
578         if (!slit_table) {
579                 for (i = 0; i < MAX_NUMNODES; i++)
580                         for (j = 0; j < MAX_NUMNODES; j++)
581                                 slit_distance(i, j) = i == j ?
582                                         LOCAL_DISTANCE : REMOTE_DISTANCE;
583                 return;
584         }
585 
586         memset(numa_slit, -1, sizeof(numa_slit));
587         for (i = 0; i < slit_table->locality_count; i++) {
588                 if (!pxm_bit_test(i))
589                         continue;
590                 node_from = pxm_to_node(i);
591                 for (j = 0; j < slit_table->locality_count; j++) {
592                         if (!pxm_bit_test(j))
593                                 continue;
594                         node_to = pxm_to_node(j);
595                         slit_distance(node_from, node_to) =
596                             slit_table->entry[i * slit_table->locality_count + j];
597                 }
598         }
599 
600 #ifdef SLIT_DEBUG
601         printk("ACPI 2.0 SLIT locality table:\n");
602         for_each_online_node(i) {
603                 for_each_online_node(j)
604                     printk("%03d ", node_distance(i, j));
605                 printk("\n");
606         }
607 #endif
608 }
609 #endif                          /* CONFIG_ACPI_NUMA */
610 
611 /*
612  * success: return IRQ number (>=0)
613  * failure: return < 0
614  */
615 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
616 {
617         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
618                 return gsi;
619 
620         if (has_8259 && gsi < 16)
621                 return isa_irq_to_vector(gsi);
622 
623         return iosapic_register_intr(gsi,
624                                      (polarity ==
625                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
626                                      IOSAPIC_POL_LOW,
627                                      (triggering ==
628                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
629                                      IOSAPIC_LEVEL);
630 }
631 EXPORT_SYMBOL_GPL(acpi_register_gsi);
632 
633 void acpi_unregister_gsi(u32 gsi)
634 {
635         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
636                 return;
637 
638         if (has_8259 && gsi < 16)
639                 return;
640 
641         iosapic_unregister_intr(gsi);
642 }
643 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
644 
645 static int __init acpi_parse_fadt(struct acpi_table_header *table)
646 {
647         struct acpi_table_header *fadt_header;
648         struct acpi_table_fadt *fadt;
649 
650         fadt_header = (struct acpi_table_header *)table;
651         if (fadt_header->revision != 3)
652                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
653 
654         fadt = (struct acpi_table_fadt *)fadt_header;
655 
656         acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
657                                  ACPI_ACTIVE_LOW);
658         return 0;
659 }
660 
661 int __init early_acpi_boot_init(void)
662 {
663         int ret;
664 
665         /*
666          * do a partial walk of MADT to determine how many CPUs
667          * we have including offline CPUs
668          */
669         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
670                 printk(KERN_ERR PREFIX "Can't find MADT\n");
671                 return 0;
672         }
673 
674         ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
675                 acpi_parse_lsapic, NR_CPUS);
676         if (ret < 1)
677                 printk(KERN_ERR PREFIX
678                        "Error parsing MADT - no LAPIC entries\n");
679         else
680                 acpi_lapic = 1;
681 
682 #ifdef CONFIG_SMP
683         if (available_cpus == 0) {
684                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
685                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
686                 smp_boot_data.cpu_phys_id[available_cpus] =
687                     hard_smp_processor_id();
688                 available_cpus = 1;     /* We've got at least one of these, no? */
689         }
690         smp_boot_data.cpu_count = available_cpus;
691 #endif
692         /* Make boot-up look pretty */
693         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
694                total_cpus);
695 
696         return 0;
697 }
698 
699 int __init acpi_boot_init(void)
700 {
701 
702         /*
703          * MADT
704          * ----
705          * Parse the Multiple APIC Description Table (MADT), if exists.
706          * Note that this table provides platform SMP configuration
707          * information -- the successor to MPS tables.
708          */
709 
710         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
711                 printk(KERN_ERR PREFIX "Can't find MADT\n");
712                 goto skip_madt;
713         }
714 
715         /* Local APIC */
716 
717         if (acpi_table_parse_madt
718             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
719                 printk(KERN_ERR PREFIX
720                        "Error parsing LAPIC address override entry\n");
721 
722         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
723             < 0)
724                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
725 
726         /* I/O APIC */
727 
728         if (acpi_table_parse_madt
729             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
730                 if (!ia64_platform_is("sn2"))
731                         printk(KERN_ERR PREFIX
732                                "Error parsing MADT - no IOSAPIC entries\n");
733         }
734 
735         /* System-Level Interrupt Routing */
736 
737         if (acpi_table_parse_madt
738             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
739              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
740                 printk(KERN_ERR PREFIX
741                        "Error parsing platform interrupt source entry\n");
742 
743         if (acpi_table_parse_madt
744             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
745                 printk(KERN_ERR PREFIX
746                        "Error parsing interrupt source overrides entry\n");
747 
748         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
749                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
750       skip_madt:
751 
752         /*
753          * FADT says whether a legacy keyboard controller is present.
754          * The FADT also contains an SCI_INT line, by which the system
755          * gets interrupts such as power and sleep buttons.  If it's not
756          * on a Legacy interrupt, it needs to be setup.
757          */
758         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
759                 printk(KERN_ERR PREFIX "Can't find FADT\n");
760 
761 #ifdef CONFIG_ACPI_NUMA
762 #ifdef CONFIG_SMP
763         if (srat_num_cpus == 0) {
764                 int cpu, i = 1;
765                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
766                         if (smp_boot_data.cpu_phys_id[cpu] !=
767                             hard_smp_processor_id())
768                                 node_cpuid[i++].phys_id =
769                                     smp_boot_data.cpu_phys_id[cpu];
770         }
771 #endif
772         build_cpu_to_node_map();
773 #endif
774         return 0;
775 }
776 
777 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
778 {
779         int tmp;
780 
781         if (has_8259 && gsi < 16)
782                 *irq = isa_irq_to_vector(gsi);
783         else {
784                 tmp = gsi_to_irq(gsi);
785                 if (tmp == -1)
786                         return -1;
787                 *irq = tmp;
788         }
789         return 0;
790 }
791 
792 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
793 {
794         if (isa_irq >= 16)
795                 return -1;
796         *gsi = isa_irq;
797         return 0;
798 }
799 
800 /*
801  *  ACPI based hotplug CPU support
802  */
803 #ifdef CONFIG_ACPI_HOTPLUG_CPU
804 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
805 {
806 #ifdef CONFIG_ACPI_NUMA
807         /*
808          * We don't have cpu-only-node hotadd. But if the system equips
809          * SRAT table, pxm is already found and node is ready.
810          * So, just pxm_to_nid(pxm) is OK.
811          * This code here is for the system which doesn't have full SRAT
812          * table for possible cpus.
813          */
814         node_cpuid[cpu].phys_id = physid;
815         node_cpuid[cpu].nid = acpi_get_node(handle);
816 #endif
817         return 0;
818 }
819 
820 int additional_cpus __initdata = -1;
821 
822 static __init int setup_additional_cpus(char *s)
823 {
824         if (s)
825                 additional_cpus = simple_strtol(s, NULL, 0);
826 
827         return 0;
828 }
829 
830 early_param("additional_cpus", setup_additional_cpus);
831 
832 /*
833  * cpu_possible_mask should be static, it cannot change as CPUs
834  * are onlined, or offlined. The reason is per-cpu data-structures
835  * are allocated by some modules at init time, and dont expect to
836  * do this dynamically on cpu arrival/departure.
837  * cpu_present_mask on the other hand can change dynamically.
838  * In case when cpu_hotplug is not compiled, then we resort to current
839  * behaviour, which is cpu_possible == cpu_present.
840  * - Ashok Raj
841  *
842  * Three ways to find out the number of additional hotplug CPUs:
843  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
844  * - The user can overwrite it with additional_cpus=NUM
845  * - Otherwise don't reserve additional CPUs.
846  */
847 __init void prefill_possible_map(void)
848 {
849         int i;
850         int possible, disabled_cpus;
851 
852         disabled_cpus = total_cpus - available_cpus;
853 
854         if (additional_cpus == -1) {
855                 if (disabled_cpus > 0)
856                         additional_cpus = disabled_cpus;
857                 else
858                         additional_cpus = 0;
859         }
860 
861         possible = available_cpus + additional_cpus;
862 
863         if (possible > nr_cpu_ids)
864                 possible = nr_cpu_ids;
865 
866         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
867                 possible, max((possible - available_cpus), 0));
868 
869         for (i = 0; i < possible; i++)
870                 set_cpu_possible(i, true);
871 }
872 
873 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
874 {
875         cpumask_t tmp_map;
876         int cpu;
877 
878         cpumask_complement(&tmp_map, cpu_present_mask);
879         cpu = cpumask_first(&tmp_map);
880         if (cpu >= nr_cpu_ids)
881                 return -EINVAL;
882 
883         acpi_map_cpu2node(handle, cpu, physid);
884 
885         set_cpu_present(cpu, true);
886         ia64_cpu_to_sapicid[cpu] = physid;
887 
888         acpi_processor_set_pdc(handle);
889 
890         *pcpu = cpu;
891         return (0);
892 }
893 
894 /* wrapper to silence section mismatch warning */
895 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
896                        int *pcpu)
897 {
898         return _acpi_map_lsapic(handle, physid, pcpu);
899 }
900 EXPORT_SYMBOL(acpi_map_cpu);
901 
902 int acpi_unmap_cpu(int cpu)
903 {
904         ia64_cpu_to_sapicid[cpu] = -1;
905         set_cpu_present(cpu, false);
906 
907 #ifdef CONFIG_ACPI_NUMA
908         /* NUMA specific cleanup's */
909 #endif
910 
911         return (0);
912 }
913 EXPORT_SYMBOL(acpi_unmap_cpu);
914 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
915 
916 #ifdef CONFIG_ACPI_NUMA
917 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
918                                     void *context, void **ret)
919 {
920         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
921         union acpi_object *obj;
922         struct acpi_madt_io_sapic *iosapic;
923         unsigned int gsi_base;
924         int node;
925 
926         /* Only care about objects w/ a method that returns the MADT */
927         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
928                 return AE_OK;
929 
930         if (!buffer.length || !buffer.pointer)
931                 return AE_OK;
932 
933         obj = buffer.pointer;
934         if (obj->type != ACPI_TYPE_BUFFER ||
935             obj->buffer.length < sizeof(*iosapic)) {
936                 kfree(buffer.pointer);
937                 return AE_OK;
938         }
939 
940         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
941 
942         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
943                 kfree(buffer.pointer);
944                 return AE_OK;
945         }
946 
947         gsi_base = iosapic->global_irq_base;
948 
949         kfree(buffer.pointer);
950 
951         /* OK, it's an IOSAPIC MADT entry; associate it with a node */
952         node = acpi_get_node(handle);
953         if (node == NUMA_NO_NODE || !node_online(node) ||
954             cpumask_empty(cpumask_of_node(node)))
955                 return AE_OK;
956 
957         /* We know a gsi to node mapping! */
958         map_iosapic_to_node(gsi_base, node);
959         return AE_OK;
960 }
961 
962 static int __init
963 acpi_map_iosapics (void)
964 {
965         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
966         return 0;
967 }
968 
969 fs_initcall(acpi_map_iosapics);
970 #endif                          /* CONFIG_ACPI_NUMA */
971 
972 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
973 {
974         int err;
975 
976         if ((err = iosapic_init(phys_addr, gsi_base)))
977                 return err;
978 
979 #ifdef CONFIG_ACPI_NUMA
980         acpi_map_iosapic(handle, 0, NULL, NULL);
981 #endif                          /* CONFIG_ACPI_NUMA */
982 
983         return 0;
984 }
985 
986 EXPORT_SYMBOL(acpi_register_ioapic);
987 
988 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
989 {
990         return iosapic_remove(gsi_base);
991 }
992 
993 EXPORT_SYMBOL(acpi_unregister_ioapic);
994 
995 /*
996  * acpi_suspend_lowlevel() - save kernel state and suspend.
997  *
998  * TBD when when IA64 starts to support suspend...
999  */
1000 int acpi_suspend_lowlevel(void) { return 0; }
1001 

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