aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kernel/apic/x2apic_uv_x.c
blob: c6d03f7a4401324444d33c0adf201ec13fbb7aea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * SGI UV APIC functions (note: not an Intel compatible APIC)
 *
 * Copyright (C) 2007-2010 Silicon Graphics, Inc. All rights reserved.
 */
#include <linux/cpumask.h>
#include <linux/hardirq.h>
#include <linux/proc_fs.h>
#include <linux/threads.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/pci.h>
#include <linux/kdebug.h>
#include <linux/delay.h>
#include <linux/crash_dump.h>

#include <asm/uv/uv_mmrs.h>
#include <asm/uv/uv_hub.h>
#include <asm/current.h>
#include <asm/pgtable.h>
#include <asm/uv/bios.h>
#include <asm/uv/uv.h>
#include <asm/apic.h>
#include <asm/ipi.h>
#include <asm/smp.h>
#include <asm/x86_init.h>
#include <asm/emergency-restart.h>
#include <asm/nmi.h>

/* BMC sets a bit this MMR non-zero before sending an NMI */
#define UVH_NMI_MMR				UVH_SCRATCH5
#define UVH_NMI_MMR_CLEAR			(UVH_NMI_MMR + 8)
#define UV_NMI_PENDING_MASK			(1UL << 63)
DEFINE_PER_CPU(unsigned long, cpu_last_nmi_count);

DEFINE_PER_CPU(int, x2apic_extra_bits);

#define PR_DEVEL(fmt, args...)	pr_devel("%s: " fmt, __func__, args)

static enum uv_system_type uv_system_type;
static u64 gru_start_paddr, gru_end_paddr;
static union uvh_apicid uvh_apicid;
int uv_min_hub_revision_id;
EXPORT_SYMBOL_GPL(uv_min_hub_revision_id);
unsigned int uv_apicid_hibits;
EXPORT_SYMBOL_GPL(uv_apicid_hibits);
static DEFINE_SPINLOCK(uv_nmi_lock);

static struct apic apic_x2apic_uv_x;

static unsigned long __init uv_early_read_mmr(unsigned long addr)
{
	unsigned long val, *mmr;

	mmr = early_ioremap(UV_LOCAL_MMR_BASE | addr, sizeof(*mmr));
	val = *mmr;
	early_iounmap(mmr, sizeof(*mmr));
	return val;
}

static inline bool is_GRU_range(u64 start, u64 end)
{
	return start >= gru_start_paddr && end <= gru_end_paddr;
}

static bool uv_is_untracked_pat_range(u64 start, u64 end)
{
	return is_ISA_range(start, end) || is_GRU_range(start, end);
}

static int __init early_get_pnodeid(void)
{
	union uvh_node_id_u node_id;
	union uvh_rh_gam_config_mmr_u  m_n_config;
	int pnode;

	/* Currently, all blades have same revision number */
	node_id.v = uv_early_read_mmr(UVH_NODE_ID);
	m_n_config.v = uv_early_read_mmr(UVH_RH_GAM_CONFIG_MMR);
	uv_min_hub_revision_id = node_id.s.revision;

	if (node_id.s.part_number == UV2_HUB_PART_NUMBER)
		uv_min_hub_revision_id += UV2_HUB_REVISION_BASE - 1;
	if (node_id.s.part_number == UV2_HUB_PART_NUMBER_X)
		uv_min_hub_revision_id += UV2_HUB_REVISION_BASE - 1;

	uv_hub_info->hub_revision = uv_min_hub_revision_id;
	pnode = (node_id.s.node_id >> 1) & ((1 << m_n_config.s.n_skt) - 1);
	return pnode;
}

static void __init early_get_apic_pnode_shift(void)
{
	uvh_apicid.v = uv_early_read_mmr(UVH_APICID);
	if (!uvh_apicid.v)
		/*
		 * Old bios, use default value
		 */
		uvh_apicid.s.pnode_shift = UV_APIC_PNODE_SHIFT;
}

/*
 * Add an extra bit as dictated by bios to the destination apicid of
 * interrupts potentially passing through the UV HUB.  This prevents
 * a deadlock between interrupts and IO port operations.
 */
static void __init uv_set_apicid_hibit(void)
{
	union uv1h_lb_target_physical_apic_id_mask_u apicid_mask;

	if (is_uv1_hub()) {
		apicid_mask.v =
			uv_early_read_mmr(UV1H_LB_TARGET_PHYSICAL_APIC_ID_MASK);
		uv_apicid_hibits =
			apicid_mask.s1.bit_enables & UV_APICID_HIBIT_MASK;
	}
}

static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
	int pnodeid, is_uv1, is_uv2;

	is_uv1 = !strcmp(oem_id, "SGI");
	is_uv2 = !strcmp(oem_id, "SGI2");
	if (is_uv1 || is_uv2) {
		uv_hub_info->hub_revision =
			is_uv1 ? UV1_HUB_REVISION_BASE : UV2_HUB_REVISION_BASE;
		pnodeid = early_get_pnodeid();
		early_get_apic_pnode_shift();
		x86_platform.is_untracked_pat_range =  uv_is_untracked_pat_range;
		x86_platform.nmi_init = uv_nmi_init;
		if (!strcmp(oem_table_id, "UVL"))
			uv_system_type = UV_LEGACY_APIC;
		else if (!strcmp(oem_table_id, "UVX"))
			uv_system_type = UV_X2APIC;
		else if (!strcmp(oem_table_id, "UVH")) {
			__this_cpu_write(x2apic_extra_bits,
				pnodeid << uvh_apicid.s.pnode_shift);
			uv_system_type = UV_NON_UNIQUE_APIC;
			uv_set_apicid_hibit();
			return 1;
		}
	}
	return 0;
}

enum uv_system_type get_uv_system_type(void)
{
	return uv_system_type;
}

int is_uv_system(void)
{
	return uv_system_type != UV_NONE;
}
EXPORT_SYMBOL_GPL(is_uv_system);

DEFINE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
EXPORT_PER_CPU_SYMBOL_GPL(__uv_hub_info);

struct uv_blade_info *uv_blade_info;
EXPORT_SYMBOL_GPL(uv_blade_info);

short *uv_node_to_blade;
EXPORT_SYMBOL_GPL(uv_node_to_blade);

short *uv_cpu_to_blade;
EXPORT_SYMBOL_GPL(uv_cpu_to_blade);

short uv_possible_blades;
EXPORT_SYMBOL_GPL(uv_possible_blades);

unsigned long sn_rtc_cycles_per_second;
EXPORT_SYMBOL(sn_rtc_cycles_per_second);

static const struct cpumask *uv_target_cpus(void)
{
	return cpu_online_mask;
}

static void uv_vector_allocation_domain(int cpu, struct cpumask *retmask)
{
	cpumask_clear(retmask);
	cpumask_set_cpu(cpu, retmask);
}

static int __cpuinit uv_wakeup_secondary(int phys_apicid, unsigned long start_rip)
{
#ifdef CONFIG_SMP
	unsigned long val;
	int pnode;

	pnode = uv_apicid_to_pnode(phys_apicid);
	phys_apicid |= uv_apicid_hibits;
	val = (1UL << UVH_IPI_INT_SEND_SHFT) |
	    (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) |
	    ((start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) |
	    APIC_DM_INIT;
	uv_write_global_mmr64(pnode, UVH_IPI_INT, val);

	val = (1UL << UVH_IPI_INT_SEND_SHFT) |
	    (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) |
	    ((start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) |
	    APIC_DM_STARTUP;
	uv_write_global_mmr64(pnode, UVH_IPI_INT, val);

	atomic_set(&init_deasserted, 1);
#endif
	return 0;
}

static void uv_send_IPI_one(int cpu, int vector)
{
	unsigned long apicid;
	int pnode;

	apicid = per_cpu(x86_cpu_to_apicid, cpu);
	pnode = uv_apicid_to_pnode(apicid);
	uv_hub_send_ipi(pnode, apicid, vector);
}

static void uv_send_IPI_mask(const struct cpumask *mask, int vector)
{
	unsigned int cpu;

	for_each_cpu(cpu, mask)
		uv_send_IPI_one(cpu, vector);
}

static void uv_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
{
	unsigned int this_cpu = smp_processor_id();
	unsigned int cpu;

	for_each_cpu(cpu, mask) {
		if (cpu != this_cpu)
			uv_send_IPI_one(cpu, vector);
	}
}

static void uv_send_IPI_allbutself(int vector)
{
	unsigned int this_cpu = smp_processor_id();
	unsigned int cpu;

	for_each_online_cpu(cpu) {
		if (cpu != this_cpu)
			uv_send_IPI_one(cpu, vector);
	}
}

static void uv_send_IPI_all(int vector)
{
	uv_send_IPI_mask(cpu_online_mask, vector);
}

static int uv_apic_id_valid(int apicid)
{
	return 1;
}

static int uv_apic_id_registered(void)
{
	return 1;
}

static void uv_init_apic_ldr(void)
{
}

static unsigned int uv_cpu_mask_to_apicid(const struct cpumask *cpumask)
{
	/*
	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
	 * May as well be the first.
	 */
	int cpu = cpumask_first(cpumask);

	if ((unsigned)cpu < nr_cpu_ids)
		return per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
	else
		return BAD_APICID;
}

static unsigned int
uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
			  const struct cpumask *andmask)
{
	int cpu;

	/*
	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
	 * May as well be the first.
	 */
	for_each_cpu_and(cpu, cpumask, andmask) {
		if (cpumask_test_cpu(cpu, cpu_online_mask))
			break;
	}
	return per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
}

static unsigned int x2apic_get_apic_id(unsigned long x)
{
	unsigned int id;

	WARN_ON(preemptible() && num_online_cpus() > 1);
	id = x | __this_cpu_read(x2apic_extra_bits);

	return id;
}

static unsigned long set_apic_id(unsigned int id)
{
	unsigned long x;

	/* maskout x2apic_extra_bits ? */
	x = id;
	return x;
}

static unsigned int uv_read_apic_id(void)
{

	return x2apic_get_apic_id(apic_read(APIC_ID));
}

static int uv_phys_pkg_id(int initial_apicid, int index_msb)
{
	return uv_read_apic_id() >> index_msb;
}

static void uv_send_IPI_self(int vector)
{
	apic_write(APIC_SELF_IPI, vector);
}

static int uv_probe(void)
{
	return apic == &apic_x2apic_uv_x;
}

static struct apic __refdata apic_x2apic_uv_x = {

	.name				= "UV large system",
	.probe				= uv_probe,
	.acpi_madt_oem_check		= uv_acpi_madt_oem_check,
	.apic_id_valid			= uv_apic_id_valid,
	.apic_id_registered		= uv_apic_id_registered,

	.irq_delivery_mode		= dest_Fixed,
	.irq_dest_mode			= 0, /* physical */

	.target_cpus			= uv_target_cpus,
	.disable_esr			= 0,
	.dest_logical			= APIC_DEST_LOGICAL,
	.check_apicid_used		= NULL,
	.check_apicid_present		= NULL,

	.vector_allocation_domain	= uv_vector_allocation_domain,
	.init_apic_ldr			= uv_init_apic_ldr,

	.ioapic_phys_id_map		= NULL,
	.setup_apic_routing		= NULL,
	.multi_timer_check		= NULL,
	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
	.apicid_to_cpu_present		= NULL,
	.setup_portio_remap		= NULL,
	.check_phys_apicid_present	= default_check_phys_apicid_present,
	.enable_apic_mode		= NULL,
	.phys_pkg_id			= uv_phys_pkg_id,
	.mps_oem_check			= NULL,

	.get_apic_id			= x2apic_get_apic_id,
	.set_apic_id			= set_apic_id,
	.apic_id_mask			= 0xFFFFFFFFu,

	.cpu_mask_to_apicid		= uv_cpu_mask_to_apicid,
	.cpu_mask_to_apicid_and		= uv_cpu_mask_to_apicid_and,

	.send_IPI_mask			= uv_send_IPI_mask,
	.send_IPI_mask_allbutself	= uv_send_IPI_mask_allbutself,
	.send_IPI_allbutself		= uv_send_IPI_allbutself,
	.send_IPI_all			= uv_send_IPI_all,
	.send_IPI_self			= uv_send_IPI_self,

	.wakeup_secondary_cpu		= uv_wakeup_secondary,
	.trampoline_phys_low		= DEFAULT_TRAMPOLINE_PHYS_LOW,
	.trampoline_phys_high		= DEFAULT_TRAMPOLINE_PHYS_HIGH,
	.wait_for_init_deassert		= NULL,
	.smp_callin_clear_local_apic	= NULL,
	.inquire_remote_apic		= NULL,

	.read				= native_apic_msr_read,
	.write				= native_apic_msr_write,
	.eoi_write			= native_apic_msr_eoi_write,
	.icr_read			= native_x2apic_icr_read,
	.icr_write			= native_x2apic_icr_write,
	.wait_icr_idle			= native_x2apic_wait_icr_idle,
	.safe_wait_icr_idle		= native_safe_x2apic_wait_icr_idle,
};

static __cpuinit void set_x2apic_extra_bits(int pnode)
{
	__this_cpu_write(x2apic_extra_bits, pnode << uvh_apicid.s.pnode_shift);
}

/*
 * Called on boot cpu.
 */
static __init int boot_pnode_to_blade(int pnode)
{
	int blade;

	for (blade = 0; blade < uv_num_possible_blades(); blade++)
		if (pnode == uv_blade_info[blade].pnode)
			return blade;
	BUG();
}

struct redir_addr {
	unsigned long redirect;
	unsigned long alias;
};

#define DEST_SHIFT UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR_DEST_BASE_SHFT

static __initdata struct redir_addr redir_addrs[] = {
	{UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR, UVH_RH_GAM_ALIAS210_OVERLAY_CONFIG_0_MMR},
	{UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_1_MMR, UVH_RH_GAM_ALIAS210_OVERLAY_CONFIG_1_MMR},
	{UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_2_MMR, UVH_RH_GAM_ALIAS210_OVERLAY_CONFIG_2_MMR},
};

static __init void get_lowmem_redirect(unsigned long *base, unsigned long *size)
{
	union uvh_rh_gam_alias210_overlay_config_2_mmr_u alias;
	union uvh_rh_gam_alias210_redirect_config_2_mmr_u redirect;
	int i;

	for (i = 0; i < ARRAY_SIZE(redir_addrs); i++) {
		alias.v = uv_read_local_mmr(redir_addrs[i].alias);
		if (alias.s.enable && alias.s.base == 0) {
			*size = (1UL << alias.s.m_alias);
			redirect.v = uv_read_local_mmr(redir_addrs[i].redirect);
			*base = (unsigned long)redirect.s.dest_base << DEST_SHIFT;
			return;
		}
	}
	*base = *size = 0;
}

enum map_type {map_wb, map_uc};

static __init void map_high(char *id, unsigned long base, int pshift,
			int bshift, int max_pnode, enum map_type map_type)
{
	unsigned long bytes, paddr;

	paddr = base << pshift;
	bytes = (1UL << bshift) * (max_pnode + 1);
	printk(KERN_INFO "UV: Map %s_HI 0x%lx - 0x%lx\n", id, paddr,
						paddr + bytes);
	if (map_type == map_uc)
		init_extra_mapping_uc(paddr, bytes);
	else
		init_extra_mapping_wb(paddr, bytes);

}
static __init void map_gru_high(int max_pnode)
{
	union uvh_rh_gam_gru_overlay_config_mmr_u gru;
	int shift = UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR_BASE_SHFT;

	gru.v = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR);
	if (gru.s.enable) {
		map_high("GRU", gru.s.base, shift, shift, max_pnode, map_wb);
		gru_start_paddr = ((u64)gru.s.base << shift);
		gru_end_paddr = gru_start_paddr + (1UL << shift) * (max_pnode + 1);

	}
}

static __init void map_mmr_high(int max_pnode)
{
	union uvh_rh_gam_mmr_overlay_config_mmr_u mmr;
	int shift = UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR_BASE_SHFT;

	mmr.v = uv_read_local_mmr(UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR);
	if (mmr.s.enable)
		map_high("MMR", mmr.s.base, shift, shift, max_pnode, map_uc);
}

static __init void map_mmioh_high(int max_pnode)
{
	union uvh_rh_gam_mmioh_overlay_config_mmr_u mmioh;
	int shift;

	mmioh.v = uv_read_local_mmr(UVH_RH_GAM_MMIOH_OVERLAY_CONFIG_MMR);
	if (is_uv1_hub() && mmioh.s1.enable) {
		shift = UV1H_RH_GAM_MMIOH_OVERLAY_CONFIG_MMR_BASE_SHFT;
		map_high("MMIOH", mmioh.s1.base, shift, mmioh.s1.m_io,
			max_pnode, map_uc);
	}
	if (is_uv2_hub() && mmioh.s2.enable) {
		shift = UV2H_RH_GAM_MMIOH_OVERLAY_CONFIG_MMR_BASE_SHFT;
		map_high("MMIOH", mmioh.s2.base, shift, mmioh.s2.m_io,
			max_pnode, map_uc);
	}
}

static __init void map_low_mmrs(void)
{
	init_extra_mapping_uc(UV_GLOBAL_MMR32_BASE, UV_GLOBAL_MMR32_SIZE);
	init_extra_mapping_uc(UV_LOCAL_MMR_BASE, UV_LOCAL_MMR_SIZE);
}

static __init void uv_rtc_init(void)
{
	long status;
	u64 ticks_per_sec;

	status = uv_bios_freq_base(BIOS_FREQ_BASE_REALTIME_CLOCK,
					&ticks_per_sec);
	if (status != BIOS_STATUS_SUCCESS || ticks_per_sec < 100000) {
		printk(KERN_WARNING
			"unable to determine platform RTC clock frequency, "
			"guessing.\n");
		/* BIOS gives wrong value for clock freq. so guess */
		sn_rtc_cycles_per_second = 1000000000000UL / 30000UL;
	} else
		sn_rtc_cycles_per_second = ticks_per_sec;
}

/*
 * percpu heartbeat timer
 */
static void uv_heartbeat(unsigned long ignored)
{
	struct timer_list *timer = &uv_hub_info->scir.timer;
	unsigned char bits = uv_hub_info->scir.state;

	/* flip heartbeat bit */
	bits ^= SCIR_CPU_HEARTBEAT;

	/* is this cpu idle? */
	if (idle_cpu(raw_smp_processor_id()))
		bits &= ~SCIR_CPU_ACTIVITY;
	else
		bits |= SCIR_CPU_ACTIVITY;

	/* update system controller interface reg */
	uv_set_scir_bits(bits);

	/* enable next timer period */
	mod_timer_pinned(timer, jiffies + SCIR_CPU_HB_INTERVAL);
}

static void __cpuinit uv_heartbeat_enable(int cpu)
{
	while (!uv_cpu_hub_info(cpu)->scir.enabled) {
		struct timer_list *timer = &uv_cpu_hub_info(cpu)->scir.timer;

		uv_set_cpu_scir_bits(cpu, SCIR_CPU_HEARTBEAT|SCIR_CPU_ACTIVITY);
		setup_timer(timer, uv_heartbeat, cpu);
		timer->expires = jiffies + SCIR_CPU_HB_INTERVAL;
		add_timer_on(timer, cpu);
		uv_cpu_hub_info(cpu)->scir.enabled = 1;

		/* also ensure that boot cpu is enabled */
		cpu = 0;
	}
}

#ifdef CONFIG_HOTPLUG_CPU
static void __cpuinit uv_heartbeat_disable(int cpu)
{
	if (uv_cpu_hub_info(cpu)->scir.enabled) {
		uv_cpu_hub_info(cpu)->scir.enabled = 0;
		del_timer(&uv_cpu_hub_info(cpu)->scir.timer);
	}
	uv_set_cpu_scir_bits(cpu, 0xff);
}

/*
 * cpu hotplug notifier
 */
static __cpuinit int uv_scir_cpu_notify(struct notifier_block *self,
				       unsigned long action, void *hcpu)
{
	long cpu = (long)hcpu;

	switch (action) {
	case CPU_ONLINE:
		uv_heartbeat_enable(cpu);
		break;
	case CPU_DOWN_PREPARE:
		uv_heartbeat_disable(cpu);
		break;
	default:
		break;
	}
	return NOTIFY_OK;
}

static __init void uv_scir_register_cpu_notifier(void)
{
	hotcpu_notifier(uv_scir_cpu_notify, 0);
}

#else /* !CONFIG_HOTPLUG_CPU */

static __init void uv_scir_register_cpu_notifier(void)
{
}

static __init int uv_init_heartbeat(void)
{
	int cpu;

	if (is_uv_system())
		for_each_online_cpu(cpu)
			uv_heartbeat_enable(cpu);
	return 0;
}

late_initcall(uv_init_heartbeat);

#endif /* !CONFIG_HOTPLUG_CPU */

/* Direct Legacy VGA I/O traffic to designated IOH */
int uv_set_vga_state(struct pci_dev *pdev, bool decode,
		      unsigned int command_bits, u32 flags)
{
	int domain, bus, rc;

	PR_DEVEL("devfn %x decode %d cmd %x flags %d\n",
			pdev->devfn, decode, command_bits, flags);

	if (!(flags & PCI_VGA_STATE_CHANGE_BRIDGE))
		return 0;

	if ((command_bits & PCI_COMMAND_IO) == 0)
		return 0;

	domain = pci_domain_nr(pdev->bus);
	bus = pdev->bus->number;

	rc = uv_bios_set_legacy_vga_target(decode, domain, bus);
	PR_DEVEL("vga decode %d %x:%x, rc: %d\n", decode, domain, bus, rc);

	return rc;
}

/*
 * Called on each cpu to initialize the per_cpu UV data area.
 * FIXME: hotplug not supported yet
 */
void __cpuinit uv_cpu_init(void)
{
	/* CPU 0 initilization will be done via uv_system_init. */
	if (!uv_blade_info)
		return;

	uv_blade_info[uv_numa_blade_id()].nr_online_cpus++;

	if (get_uv_system_type() == UV_NON_UNIQUE_APIC)
		set_x2apic_extra_bits(uv_hub_info->pnode);
}

/*
 * When NMI is received, print a stack trace.
 */
int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)
{
	unsigned long real_uv_nmi;
	int bid;

	/*
	 * Each blade has an MMR that indicates when an NMI has been sent
	 * to cpus on the blade. If an NMI is detected, atomically
	 * clear the MMR and update a per-blade NMI count used to
	 * cause each cpu on the blade to notice a new NMI.
	 */
	bid = uv_numa_blade_id();
	real_uv_nmi = (uv_read_local_mmr(UVH_NMI_MMR) & UV_NMI_PENDING_MASK);

	if (unlikely(real_uv_nmi)) {
		spin_lock(&uv_blade_info[bid].nmi_lock);
		real_uv_nmi = (uv_read_local_mmr(UVH_NMI_MMR) & UV_NMI_PENDING_MASK);
		if (real_uv_nmi) {
			uv_blade_info[bid].nmi_count++;
			uv_write_local_mmr(UVH_NMI_MMR_CLEAR, UV_NMI_PENDING_MASK);
		}
		spin_unlock(&uv_blade_info[bid].nmi_lock);
	}

	if (likely(__get_cpu_var(cpu_last_nmi_count) == uv_blade_info[bid].nmi_count))
		return NMI_DONE;

	__get_cpu_var(cpu_last_nmi_count) = uv_blade_info[bid].nmi_count;

	/*
	 * Use a lock so only one cpu prints at a time.
	 * This prevents intermixed output.
	 */
	spin_lock(&uv_nmi_lock);
	pr_info("UV NMI stack dump cpu %u:\n", smp_processor_id());
	dump_stack();
	spin_unlock(&uv_nmi_lock);

	return NMI_HANDLED;
}

void uv_register_nmi_notifier(void)
{
	if (register_nmi_handler(NMI_UNKNOWN, uv_handle_nmi, 0, "uv"))
		printk(KERN_WARNING "UV NMI handler failed to register\n");
}

void uv_nmi_init(void)
{
	unsigned int value;

	/*
	 * Unmask NMI on all cpus
	 */
	value = apic_read(APIC_LVT1) | APIC_DM_NMI;
	value &= ~APIC_LVT_MASKED;
	apic_write(APIC_LVT1, value);
}

void __init uv_system_init(void)
{
	union uvh_rh_gam_config_mmr_u  m_n_config;
	union uvh_rh_gam_mmioh_overlay_config_mmr_u mmioh;
	union uvh_node_id_u node_id;
	unsigned long gnode_upper, lowmem_redir_base, lowmem_redir_size;
	int bytes, nid, cpu, lcpu, pnode, blade, i, j, m_val, n_val, n_io;
	int gnode_extra, max_pnode = 0;
	unsigned long mmr_base, present, paddr;
	unsigned short pnode_mask, pnode_io_mask;

	printk(KERN_INFO "UV: Found %s hub\n", is_uv1_hub() ? "UV1" : "UV2");
	map_low_mmrs();

	m_n_config.v = uv_read_local_mmr(UVH_RH_GAM_CONFIG_MMR );
	m_val = m_n_config.s.m_skt;
	n_val = m_n_config.s.n_skt;
	mmioh.v = uv_read_local_mmr(UVH_RH_GAM_MMIOH_OVERLAY_CONFIG_MMR);
	n_io = is_uv1_hub() ? mmioh.s1.n_io : mmioh.s2.n_io;
	mmr_base =
	    uv_read_local_mmr(UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR) &
	    ~UV_MMR_ENABLE;
	pnode_mask = (1 << n_val) - 1;
	pnode_io_mask = (1 << n_io) - 1;

	node_id.v = uv_read_local_mmr(UVH_NODE_ID);
	gnode_extra = (node_id.s.node_id & ~((1 << n_val) - 1)) >> 1;
	gnode_upper = ((unsigned long)gnode_extra  << m_val);
	printk(KERN_INFO "UV: N %d, M %d, N_IO: %d, gnode_upper 0x%lx, gnode_extra 0x%x, pnode_mask 0x%x, pnode_io_mask 0x%x\n",
			n_val, m_val, n_io, gnode_upper, gnode_extra, pnode_mask, pnode_io_mask);

	printk(KERN_DEBUG "UV: global MMR base 0x%lx\n", mmr_base);

	for(i = 0; i < UVH_NODE_PRESENT_TABLE_DEPTH; i++)
		uv_possible_blades +=
		  hweight64(uv_read_local_mmr( UVH_NODE_PRESENT_TABLE + i * 8));

	/* uv_num_possible_blades() is really the hub count */
	printk(KERN_INFO "UV: Found %d blades, %d hubs\n",
			is_uv1_hub() ? uv_num_possible_blades() :
			(uv_num_possible_blades() + 1) / 2,
			uv_num_possible_blades());

	bytes = sizeof(struct uv_blade_info) * uv_num_possible_blades();
	uv_blade_info = kzalloc(bytes, GFP_KERNEL);
	BUG_ON(!uv_blade_info);

	for (blade = 0; blade < uv_num_possible_blades(); blade++)
		uv_blade_info[blade].memory_nid = -1;

	get_lowmem_redirect(&lowmem_redir_base, &lowmem_redir_size);

	bytes = sizeof(uv_node_to_blade[0]) * num_possible_nodes();
	uv_node_to_blade = kmalloc(bytes, GFP_KERNEL);
	BUG_ON(!uv_node_to_blade);
	memset(uv_node_to_blade, 255, bytes);

	bytes = sizeof(uv_cpu_to_blade[0]) * num_possible_cpus();
	uv_cpu_to_blade = kmalloc(bytes, GFP_KERNEL);
	BUG_ON(!uv_cpu_to_blade);
	memset(uv_cpu_to_blade, 255, bytes);

	blade = 0;
	for (i = 0; i < UVH_NODE_PRESENT_TABLE_DEPTH; i++) {
		present = uv_read_local_mmr(UVH_NODE_PRESENT_TABLE + i * 8);
		for (j = 0; j < 64; j++) {
			if (!test_bit(j, &present))
				continue;
			pnode = (i * 64 + j) & pnode_mask;
			uv_blade_info[blade].pnode = pnode;
			uv_blade_info[blade].nr_possible_cpus = 0;
			uv_blade_info[blade].nr_online_cpus = 0;
			spin_lock_init(&uv_blade_info[blade].nmi_lock);
			max_pnode = max(pnode, max_pnode);
			blade++;
		}
	}

	uv_bios_init();
	uv_bios_get_sn_info(0, &uv_type, &sn_partition_id, &sn_coherency_id,
			    &sn_region_size, &system_serial_number);
	uv_rtc_init();

	for_each_present_cpu(cpu) {
		int apicid = per_cpu(x86_cpu_to_apicid, cpu);

		nid = cpu_to_node(cpu);
		/*
		 * apic_pnode_shift must be set before calling uv_apicid_to_pnode();
		 */
		uv_cpu_hub_info(cpu)->pnode_mask = pnode_mask;
		uv_cpu_hub_info(cpu)->apic_pnode_shift = uvh_apicid.s.pnode_shift;
		uv_cpu_hub_info(cpu)->hub_revision = uv_hub_info->hub_revision;

		uv_cpu_hub_info(cpu)->m_shift = 64 - m_val;
		uv_cpu_hub_info(cpu)->n_lshift = is_uv2_1_hub() ?
				(m_val == 40 ? 40 : 39) : m_val;

		pnode = uv_apicid_to_pnode(apicid);
		blade = boot_pnode_to_blade(pnode);
		lcpu = uv_blade_info[blade].nr_possible_cpus;
		uv_blade_info[blade].nr_possible_cpus++;

		/* Any node on the blade, else will contain -1. */
		uv_blade_info[blade].memory_nid = nid;

		uv_cpu_hub_info(cpu)->lowmem_remap_base = lowmem_redir_base;
		uv_cpu_hub_info(cpu)->lowmem_remap_top = lowmem_redir_size;
		uv_cpu_hub_info(cpu)->m_val = m_val;
		uv_cpu_hub_info(cpu)->n_val = n_val;
		uv_cpu_hub_info(cpu)->numa_blade_id = blade;
		uv_cpu_hub_info(cpu)->blade_processor_id = lcpu;
		uv_cpu_hub_info(cpu)->pnode = pnode;
		uv_cpu_hub_info(cpu)->gpa_mask = (1UL << (m_val + n_val)) - 1;
		uv_cpu_hub_info(cpu)->gnode_upper = gnode_upper;
		uv_cpu_hub_info(cpu)->gnode_extra = gnode_extra;
		uv_cpu_hub_info(cpu)->global_mmr_base = mmr_base;
		uv_cpu_hub_info(cpu)->coherency_domain_number = sn_coherency_id;
		uv_cpu_hub_info(cpu)->scir.offset = uv_scir_offset(apicid);
		uv_node_to_blade[nid] = blade;
		uv_cpu_to_blade[cpu] = blade;
	}

	/* Add blade/pnode info for nodes without cpus */
	for_each_online_node(nid) {
		if (uv_node_to_blade[nid] >= 0)
			continue;
		paddr = node_start_pfn(nid) << PAGE_SHIFT;
		pnode = uv_gpa_to_pnode(uv_soc_phys_ram_to_gpa(paddr));
		blade = boot_pnode_to_blade(pnode);
		uv_node_to_blade[nid] = blade;
	}

	map_gru_high(max_pnode);
	map_mmr_high(max_pnode);
	map_mmioh_high(max_pnode & pnode_io_mask);

	uv_cpu_init();
	uv_scir_register_cpu_notifier();
	uv_register_nmi_notifier();
	proc_mkdir("sgi_uv", NULL);

	/* register Legacy VGA I/O redirection handler */
	pci_register_set_vga_state(uv_set_vga_state);

	/*
	 * For a kdump kernel the reset must be BOOT_ACPI, not BOOT_EFI, as
	 * EFI is not enabled in the kdump kernel.
	 */
	if (is_kdump_kernel())
		reboot_type = BOOT_ACPI;
}

apic_driver(apic_x2apic_uv_x);