summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/ds.c
blob: 381edcd5bc2946471e2c47e4f73a607272d25c09 (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
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
/* ds.c: Domain Services driver for Logical Domains
 *
 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/kthread.h>
#include <linux/reboot.h>
#include <linux/cpu.h>

#include <asm/hypervisor.h>
#include <asm/ldc.h>
#include <asm/vio.h>
#include <asm/mdesc.h>
#include <asm/head.h>
#include <asm/irq.h>

#include "kernel.h"

#define DRV_MODULE_NAME		"ds"
#define PFX DRV_MODULE_NAME	": "
#define DRV_MODULE_VERSION	"1.0"
#define DRV_MODULE_RELDATE	"Jul 11, 2007"

static char version[] __devinitdata =
	DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Sun LDOM domain services driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);

struct ds_msg_tag {
	__u32			type;
#define DS_INIT_REQ		0x00
#define DS_INIT_ACK		0x01
#define DS_INIT_NACK		0x02
#define DS_REG_REQ		0x03
#define DS_REG_ACK		0x04
#define DS_REG_NACK		0x05
#define DS_UNREG_REQ		0x06
#define DS_UNREG_ACK		0x07
#define DS_UNREG_NACK		0x08
#define DS_DATA			0x09
#define DS_NACK			0x0a

	__u32			len;
};

/* Result codes */
#define DS_OK			0x00
#define DS_REG_VER_NACK		0x01
#define DS_REG_DUP		0x02
#define DS_INV_HDL		0x03
#define DS_TYPE_UNKNOWN		0x04

struct ds_version {
	__u16			major;
	__u16			minor;
};

struct ds_ver_req {
	struct ds_msg_tag	tag;
	struct ds_version	ver;
};

struct ds_ver_ack {
	struct ds_msg_tag	tag;
	__u16			minor;
};

struct ds_ver_nack {
	struct ds_msg_tag	tag;
	__u16			major;
};

struct ds_reg_req {
	struct ds_msg_tag	tag;
	__u64			handle;
	__u16			major;
	__u16			minor;
	char			svc_id[0];
};

struct ds_reg_ack {
	struct ds_msg_tag	tag;
	__u64			handle;
	__u16			minor;
};

struct ds_reg_nack {
	struct ds_msg_tag	tag;
	__u64			handle;
	__u16			major;
};

struct ds_unreg_req {
	struct ds_msg_tag	tag;
	__u64			handle;
};

struct ds_unreg_ack {
	struct ds_msg_tag	tag;
	__u64			handle;
};

struct ds_unreg_nack {
	struct ds_msg_tag	tag;
	__u64			handle;
};

struct ds_data {
	struct ds_msg_tag	tag;
	__u64			handle;
};

struct ds_data_nack {
	struct ds_msg_tag	tag;
	__u64			handle;
	__u64			result;
};

struct ds_info;
struct ds_cap_state {
	__u64			handle;

	void			(*data)(struct ds_info *dp,
					struct ds_cap_state *cp,
					void *buf, int len);

	const char		*service_id;

	u8			state;
#define CAP_STATE_UNKNOWN	0x00
#define CAP_STATE_REG_SENT	0x01
#define CAP_STATE_REGISTERED	0x02
};

static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp,
			   void *buf, int len);
static void domain_shutdown_data(struct ds_info *dp,
				 struct ds_cap_state *cp,
				 void *buf, int len);
static void domain_panic_data(struct ds_info *dp,
			      struct ds_cap_state *cp,
			      void *buf, int len);
#ifdef CONFIG_HOTPLUG_CPU
static void dr_cpu_data(struct ds_info *dp,
			struct ds_cap_state *cp,
			void *buf, int len);
#endif
static void ds_pri_data(struct ds_info *dp,
			struct ds_cap_state *cp,
			void *buf, int len);
static void ds_var_data(struct ds_info *dp,
			struct ds_cap_state *cp,
			void *buf, int len);

static struct ds_cap_state ds_states_template[] = {
	{
		.service_id	= "md-update",
		.data		= md_update_data,
	},
	{
		.service_id	= "domain-shutdown",
		.data		= domain_shutdown_data,
	},
	{
		.service_id	= "domain-panic",
		.data		= domain_panic_data,
	},
#ifdef CONFIG_HOTPLUG_CPU
	{
		.service_id	= "dr-cpu",
		.data		= dr_cpu_data,
	},
#endif
	{
		.service_id	= "pri",
		.data		= ds_pri_data,
	},
	{
		.service_id	= "var-config",
		.data		= ds_var_data,
	},
	{
		.service_id	= "var-config-backup",
		.data		= ds_var_data,
	},
};

static DEFINE_SPINLOCK(ds_lock);

struct ds_info {
	struct ldc_channel	*lp;
	u8			hs_state;
#define DS_HS_START		0x01
#define DS_HS_DONE		0x02

	u64			id;

	void			*rcv_buf;
	int			rcv_buf_len;

	struct ds_cap_state	*ds_states;
	int			num_ds_states;

	struct ds_info		*next;
};

static struct ds_info *ds_info_list;

static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
{
	unsigned int index = handle >> 32;

	if (index >= dp->num_ds_states)
		return NULL;
	return &dp->ds_states[index];
}

static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
					       const char *name)
{
	int i;

	for (i = 0; i < dp->num_ds_states; i++) {
		if (strcmp(dp->ds_states[i].service_id, name))
			continue;

		return &dp->ds_states[i];
	}
	return NULL;
}

static int __ds_send(struct ldc_channel *lp, void *data, int len)
{
	int err, limit = 1000;

	err = -EINVAL;
	while (limit-- > 0) {
		err = ldc_write(lp, data, len);
		if (!err || (err != -EAGAIN))
			break;
		udelay(1);
	}

	return err;
}

static int ds_send(struct ldc_channel *lp, void *data, int len)
{
	unsigned long flags;
	int err;

	spin_lock_irqsave(&ds_lock, flags);
	err = __ds_send(lp, data, len);
	spin_unlock_irqrestore(&ds_lock, flags);

	return err;
}

struct ds_md_update_req {
	__u64				req_num;
};

struct ds_md_update_res {
	__u64				req_num;
	__u32				result;
};

static void md_update_data(struct ds_info *dp,
			   struct ds_cap_state *cp,
			   void *buf, int len)
{
	struct ldc_channel *lp = dp->lp;
	struct ds_data *dpkt = buf;
	struct ds_md_update_req *rp;
	struct {
		struct ds_data		data;
		struct ds_md_update_res	res;
	} pkt;

	rp = (struct ds_md_update_req *) (dpkt + 1);

	printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id);

	mdesc_update();

	memset(&pkt, 0, sizeof(pkt));
	pkt.data.tag.type = DS_DATA;
	pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
	pkt.data.handle = cp->handle;
	pkt.res.req_num = rp->req_num;
	pkt.res.result = DS_OK;

	ds_send(lp, &pkt, sizeof(pkt));
}

struct ds_shutdown_req {
	__u64				req_num;
	__u32				ms_delay;
};

struct ds_shutdown_res {
	__u64				req_num;
	__u32				result;
	char				reason[1];
};

static void domain_shutdown_data(struct ds_info *dp,
				 struct ds_cap_state *cp,
				 void *buf, int len)
{
	struct ldc_channel *lp = dp->lp;
	struct ds_data *dpkt = buf;
	struct ds_shutdown_req *rp;
	struct {
		struct ds_data		data;
		struct ds_shutdown_res	res;
	} pkt;

	rp = (struct ds_shutdown_req *) (dpkt + 1);

	printk(KERN_ALERT "ds-%llu: Shutdown request from "
	       "LDOM manager received.\n", dp->id);

	memset(&pkt, 0, sizeof(pkt));
	pkt.data.tag.type = DS_DATA;
	pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
	pkt.data.handle = cp->handle;
	pkt.res.req_num = rp->req_num;
	pkt.res.result = DS_OK;
	pkt.res.reason[0] = 0;

	ds_send(lp, &pkt, sizeof(pkt));

	orderly_poweroff(true);
}

struct ds_panic_req {
	__u64				req_num;
};

struct ds_panic_res {
	__u64				req_num;
	__u32				result;
	char				reason[1];
};

static void domain_panic_data(struct ds_info *dp,
			      struct ds_cap_state *cp,
			      void *buf, int len)
{
	struct ldc_channel *lp = dp->lp;
	struct ds_data *dpkt = buf;
	struct ds_panic_req *rp;
	struct {
		struct ds_data		data;
		struct ds_panic_res	res;
	} pkt;

	rp = (struct ds_panic_req *) (dpkt + 1);

	printk(KERN_ALERT "ds-%llu: Panic request from "
	       "LDOM manager received.\n", dp->id);

	memset(&pkt, 0, sizeof(pkt));
	pkt.data.tag.type = DS_DATA;
	pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
	pkt.data.handle = cp->handle;
	pkt.res.req_num = rp->req_num;
	pkt.res.result = DS_OK;
	pkt.res.reason[0] = 0;

	ds_send(lp, &pkt, sizeof(pkt));

	panic("PANIC requested by LDOM manager.");
}

#ifdef CONFIG_HOTPLUG_CPU
struct dr_cpu_tag {
	__u64				req_num;
	__u32				type;
#define DR_CPU_CONFIGURE		0x43
#define DR_CPU_UNCONFIGURE		0x55
#define DR_CPU_FORCE_UNCONFIGURE	0x46
#define DR_CPU_STATUS			0x53

/* Responses */
#define DR_CPU_OK			0x6f
#define DR_CPU_ERROR			0x65

	__u32				num_records;
};

struct dr_cpu_resp_entry {
	__u32				cpu;
	__u32				result;
#define DR_CPU_RES_OK			0x00
#define DR_CPU_RES_FAILURE		0x01
#define DR_CPU_RES_BLOCKED		0x02
#define DR_CPU_RES_CPU_NOT_RESPONDING	0x03
#define DR_CPU_RES_NOT_IN_MD		0x04

	__u32				stat;
#define DR_CPU_STAT_NOT_PRESENT		0x00
#define DR_CPU_STAT_UNCONFIGURED	0x01
#define DR_CPU_STAT_CONFIGURED		0x02

	__u32				str_off;
};

static void __dr_cpu_send_error(struct ds_info *dp,
				struct ds_cap_state *cp,
				struct ds_data *data)
{
	struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
	struct {
		struct ds_data		data;
		struct dr_cpu_tag	tag;
	} pkt;
	int msg_len;

	memset(&pkt, 0, sizeof(pkt));
	pkt.data.tag.type = DS_DATA;
	pkt.data.handle = cp->handle;
	pkt.tag.req_num = tag->req_num;
	pkt.tag.type = DR_CPU_ERROR;
	pkt.tag.num_records = 0;

	msg_len = (sizeof(struct ds_data) +
		   sizeof(struct dr_cpu_tag));

	pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);

	__ds_send(dp->lp, &pkt, msg_len);
}

static void dr_cpu_send_error(struct ds_info *dp,
			      struct ds_cap_state *cp,
			      struct ds_data *data)
{
	unsigned long flags;

	spin_lock_irqsave(&ds_lock, flags);
	__dr_cpu_send_error(dp, cp, data);
	spin_unlock_irqrestore(&ds_lock, flags);
}

#define CPU_SENTINEL	0xffffffff

static void purge_dups(u32 *list, u32 num_ents)
{
	unsigned int i;

	for (i = 0; i < num_ents; i++) {
		u32 cpu = list[i];
		unsigned int j;

		if (cpu == CPU_SENTINEL)
			continue;

		for (j = i + 1; j < num_ents; j++) {
			if (list[j] == cpu)
				list[j] = CPU_SENTINEL;
		}
	}
}

static int dr_cpu_size_response(int ncpus)
{
	return (sizeof(struct ds_data) +
		sizeof(struct dr_cpu_tag) +
		(sizeof(struct dr_cpu_resp_entry) * ncpus));
}

static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
				 u64 handle, int resp_len, int ncpus,
				 cpumask_t *mask, u32 default_stat)
{
	struct dr_cpu_resp_entry *ent;
	struct dr_cpu_tag *tag;
	int i, cpu;

	tag = (struct dr_cpu_tag *) (resp + 1);
	ent = (struct dr_cpu_resp_entry *) (tag + 1);

	resp->tag.type = DS_DATA;
	resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
	resp->handle = handle;
	tag->req_num = req_num;
	tag->type = DR_CPU_OK;
	tag->num_records = ncpus;

	i = 0;
	for_each_cpu(cpu, mask) {
		ent[i].cpu = cpu;
		ent[i].result = DR_CPU_RES_OK;
		ent[i].stat = default_stat;
		i++;
	}
	BUG_ON(i != ncpus);
}

static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
			u32 res, u32 stat)
{
	struct dr_cpu_resp_entry *ent;
	struct dr_cpu_tag *tag;
	int i;

	tag = (struct dr_cpu_tag *) (resp + 1);
	ent = (struct dr_cpu_resp_entry *) (tag + 1);

	for (i = 0; i < ncpus; i++) {
		if (ent[i].cpu != cpu)
			continue;
		ent[i].result = res;
		ent[i].stat = stat;
		break;
	}
}

static int __cpuinit dr_cpu_configure(struct ds_info *dp,
				      struct ds_cap_state *cp,
				      u64 req_num,
				      cpumask_t *mask)
{
	struct ds_data *resp;
	int resp_len, ncpus, cpu;
	unsigned long flags;

	ncpus = cpumask_weight(mask);
	resp_len = dr_cpu_size_response(ncpus);
	resp = kzalloc(resp_len, GFP_KERNEL);
	if (!resp)
		return -ENOMEM;

	dr_cpu_init_response(resp, req_num, cp->handle,
			     resp_len, ncpus, mask,
			     DR_CPU_STAT_CONFIGURED);

	mdesc_populate_present_mask(mask);
	mdesc_fill_in_cpu_data(mask);

	for_each_cpu(cpu, mask) {
		int err;

		printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
		       dp->id, cpu);
		err = cpu_up(cpu);
		if (err) {
			__u32 res = DR_CPU_RES_FAILURE;
			__u32 stat = DR_CPU_STAT_UNCONFIGURED;

			if (!cpu_present(cpu)) {
				/* CPU not present in MD */
				res = DR_CPU_RES_NOT_IN_MD;
				stat = DR_CPU_STAT_NOT_PRESENT;
			} else if (err == -ENODEV) {
				/* CPU did not call in successfully */
				res = DR_CPU_RES_CPU_NOT_RESPONDING;
			}

			printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
			       dp->id, err);
			dr_cpu_mark(resp, cpu, ncpus, res, stat);
		}
	}

	spin_lock_irqsave(&ds_lock, flags);
	__ds_send(dp->lp, resp, resp_len);
	spin_unlock_irqrestore(&ds_lock, flags);

	kfree(resp);

	/* Redistribute IRQs, taking into account the new cpus.  */
	fixup_irqs();

	return 0;
}

static int dr_cpu_unconfigure(struct ds_info *dp,
			      struct ds_cap_state *cp,
			      u64 req_num,
			      cpumask_t *mask)
{
	struct ds_data *resp;
	int resp_len, ncpus, cpu;
	unsigned long flags;

	ncpus = cpumask_weight(mask);
	resp_len = dr_cpu_size_response(ncpus);
	resp = kzalloc(resp_len, GFP_KERNEL);
	if (!resp)
		return -ENOMEM;

	dr_cpu_init_response(resp, req_num, cp->handle,
			     resp_len, ncpus, mask,
			     DR_CPU_STAT_UNCONFIGURED);

	for_each_cpu(cpu, mask) {
		int err;

		printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
		       dp->id, cpu);
		err = cpu_down(cpu);
		if (err)
			dr_cpu_mark(resp, cpu, ncpus,
				    DR_CPU_RES_FAILURE,
				    DR_CPU_STAT_CONFIGURED);
	}

	spin_lock_irqsave(&ds_lock, flags);
	__ds_send(dp->lp, resp, resp_len);
	spin_unlock_irqrestore(&ds_lock, flags);

	kfree(resp);

	return 0;
}

static void __cpuinit dr_cpu_data(struct ds_info *dp,
				  struct ds_cap_state *cp,
				  void *buf, int len)
{
	struct ds_data *data = buf;
	struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
	u32 *cpu_list = (u32 *) (tag + 1);
	u64 req_num = tag->req_num;
	cpumask_t mask;
	unsigned int i;
	int err;

	switch (tag->type) {
	case DR_CPU_CONFIGURE:
	case DR_CPU_UNCONFIGURE:
	case DR_CPU_FORCE_UNCONFIGURE:
		break;

	default:
		dr_cpu_send_error(dp, cp, data);
		return;
	}

	purge_dups(cpu_list, tag->num_records);

	cpumask_clear(&mask);
	for (i = 0; i < tag->num_records; i++) {
		if (cpu_list[i] == CPU_SENTINEL)
			continue;

		if (cpu_list[i] < nr_cpu_ids)
			cpumask_set_cpu(cpu_list[i], &mask);
	}

	if (tag->type == DR_CPU_CONFIGURE)
		err = dr_cpu_configure(dp, cp, req_num, &mask);
	else
		err = dr_cpu_unconfigure(dp, cp, req_num, &mask);

	if (err)
		dr_cpu_send_error(dp, cp, data);
}
#endif /* CONFIG_HOTPLUG_CPU */

struct ds_pri_msg {
	__u64				req_num;
	__u64				type;
#define DS_PRI_REQUEST			0x00
#define DS_PRI_DATA			0x01
#define DS_PRI_UPDATE			0x02
};

static void ds_pri_data(struct ds_info *dp,
			struct ds_cap_state *cp,
			void *buf, int len)
{
	struct ds_data *dpkt = buf;
	struct ds_pri_msg *rp;

	rp = (struct ds_pri_msg *) (dpkt + 1);

	printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n",
	       dp->id, rp->req_num, rp->type, len);
}

struct ds_var_hdr {
	__u32				type;
#define DS_VAR_SET_REQ			0x00
#define DS_VAR_DELETE_REQ		0x01
#define DS_VAR_SET_RESP			0x02
#define DS_VAR_DELETE_RESP		0x03
};

struct ds_var_set_msg {
	struct ds_var_hdr		hdr;
	char				name_and_value[0];
};

struct ds_var_delete_msg {
	struct ds_var_hdr		hdr;
	char				name[0];
};

struct ds_var_resp {
	struct ds_var_hdr		hdr;
	__u32				result;
#define DS_VAR_SUCCESS			0x00
#define DS_VAR_NO_SPACE			0x01
#define DS_VAR_INVALID_VAR		0x02
#define DS_VAR_INVALID_VAL		0x03
#define DS_VAR_NOT_PRESENT		0x04
};

static DEFINE_MUTEX(ds_var_mutex);
static int ds_var_doorbell;
static int ds_var_response;

static void ds_var_data(struct ds_info *dp,
			struct ds_cap_state *cp,
			void *buf, int len)
{
	struct ds_data *dpkt = buf;
	struct ds_var_resp *rp;

	rp = (struct ds_var_resp *) (dpkt + 1);

	if (rp->hdr.type != DS_VAR_SET_RESP &&
	    rp->hdr.type != DS_VAR_DELETE_RESP)
		return;

	ds_var_response = rp->result;
	wmb();
	ds_var_doorbell = 1;
}

void ldom_set_var(const char *var, const char *value)
{
	struct ds_cap_state *cp;
	struct ds_info *dp;
	unsigned long flags;

	spin_lock_irqsave(&ds_lock, flags);
	cp = NULL;
	for (dp = ds_info_list; dp; dp = dp->next) {
		struct ds_cap_state *tmp;

		tmp = find_cap_by_string(dp, "var-config");
		if (tmp && tmp->state == CAP_STATE_REGISTERED) {
			cp = tmp;
			break;
		}
	}
	if (!cp) {
		for (dp = ds_info_list; dp; dp = dp->next) {
			struct ds_cap_state *tmp;

			tmp = find_cap_by_string(dp, "var-config-backup");
			if (tmp && tmp->state == CAP_STATE_REGISTERED) {
				cp = tmp;
				break;
			}
		}
	}
	spin_unlock_irqrestore(&ds_lock, flags);

	if (cp) {
		union {
			struct {
				struct ds_data		data;
				struct ds_var_set_msg	msg;
			} header;
			char			all[512];
		} pkt;
		char  *base, *p;
		int msg_len, loops;

		memset(&pkt, 0, sizeof(pkt));
		pkt.header.data.tag.type = DS_DATA;
		pkt.header.data.handle = cp->handle;
		pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
		base = p = &pkt.header.msg.name_and_value[0];
		strcpy(p, var);
		p += strlen(var) + 1;
		strcpy(p, value);
		p += strlen(value) + 1;

		msg_len = (sizeof(struct ds_data) +
			   sizeof(struct ds_var_set_msg) +
			   (p - base));
		msg_len = (msg_len + 3) & ~3;
		pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);

		mutex_lock(&ds_var_mutex);

		spin_lock_irqsave(&ds_lock, flags);
		ds_var_doorbell = 0;
		ds_var_response = -1;

		__ds_send(dp->lp, &pkt, msg_len);
		spin_unlock_irqrestore(&ds_lock, flags);

		loops = 1000;
		while (ds_var_doorbell == 0) {
			if (loops-- < 0)
				break;
			barrier();
			udelay(100);
		}

		mutex_unlock(&ds_var_mutex);

		if (ds_var_doorbell == 0 ||
		    ds_var_response != DS_VAR_SUCCESS)
			printk(KERN_ERR "ds-%llu: var-config [%s:%s] "
			       "failed, response(%d).\n",
			       dp->id, var, value,
			       ds_var_response);
	} else {
		printk(KERN_ERR PFX "var-config not registered so "
		       "could not set (%s) variable to (%s).\n",
		       var, value);
	}
}

static char full_boot_str[256] __attribute__((aligned(32)));
static int reboot_data_supported;

void ldom_reboot(const char *boot_command)
{
	/* Don't bother with any of this if the boot_command
	 * is empty.
	 */
	if (boot_command && strlen(boot_command)) {
		unsigned long len;

		strcpy(full_boot_str, "boot ");
		strcpy(full_boot_str + strlen("boot "), boot_command);
		len = strlen(full_boot_str);

		if (reboot_data_supported) {
			unsigned long ra = kimage_addr_to_ra(full_boot_str);
			unsigned long hv_ret;

			hv_ret = sun4v_reboot_data_set(ra, len);
			if (hv_ret != HV_EOK)
				pr_err("SUN4V: Unable to set reboot data "
				       "hv_ret=%lu\n", hv_ret);
		} else {
			ldom_set_var("reboot-command", full_boot_str);
		}
	}
	sun4v_mach_sir();
}

void ldom_power_off(void)
{
	sun4v_mach_exit(0);
}

static void ds_conn_reset(struct ds_info *dp)
{
	printk(KERN_ERR "ds-%llu: ds_conn_reset() from %p\n",
	       dp->id, __builtin_return_address(0));
}

static int register_services(struct ds_info *dp)
{
	struct ldc_channel *lp = dp->lp;
	int i;

	for (i = 0; i < dp->num_ds_states; i++) {
		struct {
			struct ds_reg_req req;
			u8 id_buf[256];
		} pbuf;
		struct ds_cap_state *cp = &dp->ds_states[i];
		int err, msg_len;
		u64 new_count;

		if (cp->state == CAP_STATE_REGISTERED)
			continue;

		new_count = sched_clock() & 0xffffffff;
		cp->handle = ((u64) i << 32) | new_count;

		msg_len = (sizeof(struct ds_reg_req) +
			   strlen(cp->service_id));

		memset(&pbuf, 0, sizeof(pbuf));
		pbuf.req.tag.type = DS_REG_REQ;
		pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
		pbuf.req.handle = cp->handle;
		pbuf.req.major = 1;
		pbuf.req.minor = 0;
		strcpy(pbuf.req.svc_id, cp->service_id);

		err = __ds_send(lp, &pbuf, msg_len);
		if (err > 0)
			cp->state = CAP_STATE_REG_SENT;
	}
	return 0;
}

static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
{

	if (dp->hs_state == DS_HS_START) {
		if (pkt->type != DS_INIT_ACK)
			goto conn_reset;

		dp->hs_state = DS_HS_DONE;

		return register_services(dp);
	}

	if (dp->hs_state != DS_HS_DONE)
		goto conn_reset;

	if (pkt->type == DS_REG_ACK) {
		struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
		struct ds_cap_state *cp = find_cap(dp, ap->handle);

		if (!cp) {
			printk(KERN_ERR "ds-%llu: REG ACK for unknown "
			       "handle %llx\n", dp->id, ap->handle);
			return 0;
		}
		printk(KERN_INFO "ds-%llu: Registered %s service.\n",
		       dp->id, cp->service_id);
		cp->state = CAP_STATE_REGISTERED;
	} else if (pkt->type == DS_REG_NACK) {
		struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
		struct ds_cap_state *cp = find_cap(dp, np->handle);

		if (!cp) {
			printk(KERN_ERR "ds-%llu: REG NACK for "
			       "unknown handle %llx\n",
			       dp->id, np->handle);
			return 0;
		}
		cp->state = CAP_STATE_UNKNOWN;
	}

	return 0;

conn_reset:
	ds_conn_reset(dp);
	return -ECONNRESET;
}

static void __send_ds_nack(struct ds_info *dp, u64 handle)
{
	struct ds_data_nack nack = {
		.tag = {
			.type = DS_NACK,
			.len = (sizeof(struct ds_data_nack) -
				sizeof(struct ds_msg_tag)),
		},
		.handle = handle,
		.result = DS_INV_HDL,
	};

	__ds_send(dp->lp, &nack, sizeof(nack));
}

static LIST_HEAD(ds_work_list);
static DECLARE_WAIT_QUEUE_HEAD(ds_wait);

struct ds_queue_entry {
	struct list_head		list;
	struct ds_info			*dp;
	int				req_len;
	int				__pad;
	u64				req[0];
};

static void process_ds_work(void)
{
	struct ds_queue_entry *qp, *tmp;
	unsigned long flags;
	LIST_HEAD(todo);

	spin_lock_irqsave(&ds_lock, flags);
	list_splice_init(&ds_work_list, &todo);
	spin_unlock_irqrestore(&ds_lock, flags);

	list_for_each_entry_safe(qp, tmp, &todo, list) {
		struct ds_data *dpkt = (struct ds_data *) qp->req;
		struct ds_info *dp = qp->dp;
		struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
		int req_len = qp->req_len;

		if (!cp) {
			printk(KERN_ERR "ds-%llu: Data for unknown "
			       "handle %llu\n",
			       dp->id, dpkt->handle);

			spin_lock_irqsave(&ds_lock, flags);
			__send_ds_nack(dp, dpkt->handle);
			spin_unlock_irqrestore(&ds_lock, flags);
		} else {
			cp->data(dp, cp, dpkt, req_len);
		}

		list_del(&qp->list);
		kfree(qp);
	}
}

static int ds_thread(void *__unused)
{
	DEFINE_WAIT(wait);

	while (1) {
		prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
		if (list_empty(&ds_work_list))
			schedule();
		finish_wait(&ds_wait, &wait);

		if (kthread_should_stop())
			break;

		process_ds_work();
	}

	return 0;
}

static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
{
	struct ds_data *dpkt = (struct ds_data *) pkt;
	struct ds_queue_entry *qp;

	qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
	if (!qp) {
		__send_ds_nack(dp, dpkt->handle);
	} else {
		qp->dp = dp;
		memcpy(&qp->req, pkt, len);
		list_add_tail(&qp->list, &ds_work_list);
		wake_up(&ds_wait);
	}
	return 0;
}

static void ds_up(struct ds_info *dp)
{
	struct ldc_channel *lp = dp->lp;
	struct ds_ver_req req;
	int err;

	req.tag.type = DS_INIT_REQ;
	req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
	req.ver.major = 1;
	req.ver.minor = 0;

	err = __ds_send(lp, &req, sizeof(req));
	if (err > 0)
		dp->hs_state = DS_HS_START;
}

static void ds_reset(struct ds_info *dp)
{
	int i;

	dp->hs_state = 0;

	for (i = 0; i < dp->num_ds_states; i++) {
		struct ds_cap_state *cp = &dp->ds_states[i];

		cp->state = CAP_STATE_UNKNOWN;
	}
}

static void ds_event(void *arg, int event)
{
	struct ds_info *dp = arg;
	struct ldc_channel *lp = dp->lp;
	unsigned long flags;
	int err;

	spin_lock_irqsave(&ds_lock, flags);

	if (event == LDC_EVENT_UP) {
		ds_up(dp);
		spin_unlock_irqrestore(&ds_lock, flags);
		return;
	}

	if (event == LDC_EVENT_RESET) {
		ds_reset(dp);
		spin_unlock_irqrestore(&ds_lock, flags);
		return;
	}

	if (event != LDC_EVENT_DATA_READY) {
		printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
		       dp->id, event);
		spin_unlock_irqrestore(&ds_lock, flags);
		return;
	}

	err = 0;
	while (1) {
		struct ds_msg_tag *tag;

		err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));

		if (unlikely(err < 0)) {
			if (err == -ECONNRESET)
				ds_conn_reset(dp);
			break;
		}
		if (err == 0)
			break;

		tag = dp->rcv_buf;
		err = ldc_read(lp, tag + 1, tag->len);

		if (unlikely(err < 0)) {
			if (err == -ECONNRESET)
				ds_conn_reset(dp);
			break;
		}
		if (err < tag->len)
			break;

		if (tag->type < DS_DATA)
			err = ds_handshake(dp, dp->rcv_buf);
		else
			err = ds_data(dp, dp->rcv_buf,
				      sizeof(*tag) + err);
		if (err == -ECONNRESET)
			break;
	}

	spin_unlock_irqrestore(&ds_lock, flags);
}

static int __devinit ds_probe(struct vio_dev *vdev,
			      const struct vio_device_id *id)
{
	static int ds_version_printed;
	struct ldc_channel_config ds_cfg = {
		.event		= ds_event,
		.mtu		= 4096,
		.mode		= LDC_MODE_STREAM,
	};
	struct mdesc_handle *hp;
	struct ldc_channel *lp;
	struct ds_info *dp;
	const u64 *val;
	int err, i;

	if (ds_version_printed++ == 0)
		printk(KERN_INFO "%s", version);

	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
	err = -ENOMEM;
	if (!dp)
		goto out_err;

	hp = mdesc_grab();
	val = mdesc_get_property(hp, vdev->mp, "id", NULL);
	if (val)
		dp->id = *val;
	mdesc_release(hp);

	dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
	if (!dp->rcv_buf)
		goto out_free_dp;

	dp->rcv_buf_len = 4096;

	dp->ds_states = kmemdup(ds_states_template,
				sizeof(ds_states_template), GFP_KERNEL);
	if (!dp->ds_states)
		goto out_free_rcv_buf;

	dp->num_ds_states = ARRAY_SIZE(ds_states_template);

	for (i = 0; i < dp->num_ds_states; i++)
		dp->ds_states[i].handle = ((u64)i << 32);

	ds_cfg.tx_irq = vdev->tx_irq;
	ds_cfg.rx_irq = vdev->rx_irq;

	lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
	if (IS_ERR(lp)) {
		err = PTR_ERR(lp);
		goto out_free_ds_states;
	}
	dp->lp = lp;

	err = ldc_bind(lp, "DS");
	if (err)
		goto out_free_ldc;

	spin_lock_irq(&ds_lock);
	dp->next = ds_info_list;
	ds_info_list = dp;
	spin_unlock_irq(&ds_lock);

	return err;

out_free_ldc:
	ldc_free(dp->lp);

out_free_ds_states:
	kfree(dp->ds_states);

out_free_rcv_buf:
	kfree(dp->rcv_buf);

out_free_dp:
	kfree(dp);

out_err:
	return err;
}

static int ds_remove(struct vio_dev *vdev)
{
	return 0;
}

static const struct vio_device_id ds_match[] = {
	{
		.type = "domain-services-port",
	},
	{},
};

static struct vio_driver ds_driver = {
	.id_table	= ds_match,
	.probe		= ds_probe,
	.remove		= ds_remove,
	.driver		= {
		.name	= "ds",
		.owner	= THIS_MODULE,
	}
};

static int __init ds_init(void)
{
	unsigned long hv_ret, major, minor;

	if (tlb_type == hypervisor) {
		hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor);
		if (hv_ret == HV_EOK) {
			pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n",
				major, minor);
			reboot_data_supported = 1;
		}
	}
	kthread_run(ds_thread, NULL, "kldomd");

	return vio_register_driver(&ds_driver);
}

subsys_initcall(ds_init);
OpenPOWER on IntegriCloud