summaryrefslogtreecommitdiffstats
path: root/drivers/misc/sgi-xp/xpc.h
blob: 619208d618627692c8cbaec3e0448b1d15479577 (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
/*
 * 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.
 *
 * Copyright (c) 2004-2008 Silicon Graphics, Inc.  All Rights Reserved.
 */

/*
 * Cross Partition Communication (XPC) structures and macros.
 */

#ifndef _DRIVERS_MISC_SGIXP_XPC_H
#define _DRIVERS_MISC_SGIXP_XPC_H

#include <linux/wait.h>
#include <linux/completion.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include "xp.h"

/*
 * XPC Version numbers consist of a major and minor number. XPC can always
 * talk to versions with same major #, and never talk to versions with a
 * different major #.
 */
#define _XPC_VERSION(_maj, _min)	(((_maj) << 4) | ((_min) & 0xf))
#define XPC_VERSION_MAJOR(_v)		((_v) >> 4)
#define XPC_VERSION_MINOR(_v)		((_v) & 0xf)

/* define frequency of the heartbeat and frequency how often it's checked */
#define XPC_HB_DEFAULT_INTERVAL		5	/* incr HB every x secs */
#define XPC_HB_CHECK_DEFAULT_INTERVAL	20	/* check HB every x secs */

/* define the process name of HB checker and the CPU it is pinned to */
#define XPC_HB_CHECK_THREAD_NAME	"xpc_hb"
#define XPC_HB_CHECK_CPU		0

/* define the process name of the discovery thread */
#define XPC_DISCOVERY_THREAD_NAME	"xpc_discovery"

/*
 * the reserved page
 *
 *   SAL reserves one page of memory per partition for XPC. Though a full page
 *   in length (16384 bytes), its starting address is not page aligned, but it
 *   is cacheline aligned. The reserved page consists of the following:
 *
 *   reserved page header
 *
 *     The first two 64-byte cachelines of the reserved page contain the
 *     header (struct xpc_rsvd_page). Before SAL initialization has completed,
 *     SAL has set up the following fields of the reserved page header:
 *     SAL_signature, SAL_version, SAL_partid, and SAL_nasids_size. The
 *     other fields are set up by XPC. (xpc_rsvd_page points to the local
 *     partition's reserved page.)
 *
 *   part_nasids mask
 *   mach_nasids mask
 *
 *     SAL also sets up two bitmaps (or masks), one that reflects the actual
 *     nasids in this partition (part_nasids), and the other that reflects
 *     the actual nasids in the entire machine (mach_nasids). We're only
 *     interested in the even numbered nasids (which contain the processors
 *     and/or memory), so we only need half as many bits to represent the
 *     nasids. When mapping nasid to bit in a mask (or bit to nasid) be sure
 *     to either divide or multiply by 2. The part_nasids mask is located
 *     starting at the first cacheline following the reserved page header. The
 *     mach_nasids mask follows right after the part_nasids mask. The size in
 *     bytes of each mask is reflected by the reserved page header field
 *     'SAL_nasids_size'. (Local partition's mask pointers are xpc_part_nasids
 *     and xpc_mach_nasids.)
 *
 *   vars	(ia64-sn2 only)
 *   vars part	(ia64-sn2 only)
 *
 *     Immediately following the mach_nasids mask are the XPC variables
 *     required by other partitions. First are those that are generic to all
 *     partitions (vars), followed on the next available cacheline by those
 *     which are partition specific (vars part). These are setup by XPC.
 *     (Local partition's vars pointers are xpc_vars and xpc_vars_part.)
 *
 * Note: Until 'ts_jiffies' is set non-zero, the partition XPC code has not been
 *       initialized.
 */
struct xpc_rsvd_page {
	u64 SAL_signature;	/* SAL: unique signature */
	u64 SAL_version;	/* SAL: version */
	short SAL_partid;	/* SAL: partition ID */
	short max_npartitions;	/* value of XPC_MAX_PARTITIONS */
	u8 version;
	u8 pad1[3];		/* align to next u64 in 1st 64-byte cacheline */
	union {
		unsigned long vars_pa;	/* phys address of struct xpc_vars */
		unsigned long activate_mq_gpa; /* gru phy addr of activate_mq */
	} sn;
	unsigned long ts_jiffies; /* timestamp when rsvd pg was setup by XPC */
	u64 pad2[10];		/* align to last u64 in 2nd 64-byte cacheline */
	u64 SAL_nasids_size;	/* SAL: size of each nasid mask in bytes */
};

#define XPC_RP_VERSION _XPC_VERSION(2, 0) /* version 2.0 of the reserved page */

/*
 * Define the structures by which XPC variables can be exported to other
 * partitions. (There are two: struct xpc_vars and struct xpc_vars_part)
 */

/*
 * The following structure describes the partition generic variables
 * needed by other partitions in order to properly initialize.
 *
 * struct xpc_vars version number also applies to struct xpc_vars_part.
 * Changes to either structure and/or related functionality should be
 * reflected by incrementing either the major or minor version numbers
 * of struct xpc_vars.
 */
struct xpc_vars_sn2 {
	u8 version;
	u64 heartbeat;
	DECLARE_BITMAP(heartbeating_to_mask, XP_MAX_NPARTITIONS_SN2);
	u64 heartbeat_offline;	/* if 0, heartbeat should be changing */
	int activate_IRQ_nasid;
	int activate_IRQ_phys_cpuid;
	unsigned long vars_part_pa;
	unsigned long amos_page_pa;/* paddr of page of amos from MSPEC driver */
	struct amo *amos_page;	/* vaddr of page of amos from MSPEC driver */
};

#define XPC_V_VERSION _XPC_VERSION(3, 1)    /* version 3.1 of the cross vars */

/*
 * The following structure describes the per partition specific variables.
 *
 * An array of these structures, one per partition, will be defined. As a
 * partition becomes active XPC will copy the array entry corresponding to
 * itself from that partition. It is desirable that the size of this structure
 * evenly divides into a 128-byte cacheline, such that none of the entries in
 * this array crosses a 128-byte cacheline boundary. As it is now, each entry
 * occupies 64-bytes.
 */
struct xpc_vars_part_sn2 {
	u64 magic;

	unsigned long openclose_args_pa; /* phys addr of open and close args */
	unsigned long GPs_pa;	/* physical address of Get/Put values */

	unsigned long chctl_amo_pa; /* physical address of chctl flags' amo */

	int notify_IRQ_nasid;	/* nasid of where to send notify IRQs */
	int notify_IRQ_phys_cpuid;	/* CPUID of where to send notify IRQs */

	u8 nchannels;		/* #of defined channels supported */

	u8 reserved[23];	/* pad to a full 64 bytes */
};

/*
 * The vars_part MAGIC numbers play a part in the first contact protocol.
 *
 * MAGIC1 indicates that the per partition specific variables for a remote
 * partition have been initialized by this partition.
 *
 * MAGIC2 indicates that this partition has pulled the remote partititions
 * per partition variables that pertain to this partition.
 */
#define XPC_VP_MAGIC1_SN2 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */
#define XPC_VP_MAGIC2_SN2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */

/* the reserved page sizes and offsets */

#define XPC_RP_HEADER_SIZE	L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page))
#define XPC_RP_VARS_SIZE	L1_CACHE_ALIGN(sizeof(struct xpc_vars_sn2))

#define XPC_RP_PART_NASIDS(_rp) ((unsigned long *)((u8 *)(_rp) + \
				 XPC_RP_HEADER_SIZE))
#define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + \
				 xpc_nasid_mask_nlongs)
#define XPC_RP_VARS(_rp)	((struct xpc_vars_sn2 *) \
				 (XPC_RP_MACH_NASIDS(_rp) + \
				  xpc_nasid_mask_nlongs))

/*
 * The activate_mq is used to send/receive GRU messages that affect XPC's
 * heartbeat, partition active state, and channel state. This is UV only.
 */
struct xpc_activate_mq_msghdr_uv {
	short partid;		/* sender's partid */
	u8 act_state;		/* sender's act_state at time msg sent */
	u8 type;		/* message's type */
	unsigned long rp_ts_jiffies; /* timestamp of sender's rp setup by XPC */
};

/* activate_mq defined message types */
#define XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV		0
#define XPC_ACTIVATE_MQ_MSG_INC_HEARTBEAT_UV		1
#define XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV	2
#define XPC_ACTIVATE_MQ_MSG_ONLINE_HEARTBEAT_UV		3

#define XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV		4
#define XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV		5

#define XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV	6
#define XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV		7
#define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV	8
#define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV		9

#define XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV		10
#define XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV		11

struct xpc_activate_mq_msg_uv {
	struct xpc_activate_mq_msghdr_uv hdr;
};

struct xpc_activate_mq_msg_heartbeat_req_uv {
	struct xpc_activate_mq_msghdr_uv hdr;
	u64 heartbeat;
};

struct xpc_activate_mq_msg_activate_req_uv {
	struct xpc_activate_mq_msghdr_uv hdr;
	unsigned long rp_gpa;
	unsigned long activate_mq_gpa;
};

struct xpc_activate_mq_msg_deactivate_req_uv {
	struct xpc_activate_mq_msghdr_uv hdr;
	enum xp_retval reason;
};

struct xpc_activate_mq_msg_chctl_closerequest_uv {
	struct xpc_activate_mq_msghdr_uv hdr;
	short ch_number;
	enum xp_retval reason;
};

struct xpc_activate_mq_msg_chctl_closereply_uv {
	struct xpc_activate_mq_msghdr_uv hdr;
	short ch_number;
};

struct xpc_activate_mq_msg_chctl_openrequest_uv {
	struct xpc_activate_mq_msghdr_uv hdr;
	short ch_number;
	short entry_size;	/* size of notify_mq's GRU messages */
	short local_nentries;	/* ??? Is this needed? What is? */
};

struct xpc_activate_mq_msg_chctl_openreply_uv {
	struct xpc_activate_mq_msghdr_uv hdr;
	short ch_number;
	short remote_nentries;	/* ??? Is this needed? What is? */
	short local_nentries;	/* ??? Is this needed? What is? */
	unsigned long local_notify_mq_gpa;
};

/*
 * Functions registered by add_timer() or called by kernel_thread() only
 * allow for a single 64-bit argument. The following macros can be used to
 * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from
 * the passed argument.
 */
#define XPC_PACK_ARGS(_arg1, _arg2) \
			((((u64)_arg1) & 0xffffffff) | \
			((((u64)_arg2) & 0xffffffff) << 32))

#define XPC_UNPACK_ARG1(_args)	(((u64)_args) & 0xffffffff)
#define XPC_UNPACK_ARG2(_args)	((((u64)_args) >> 32) & 0xffffffff)

/*
 * Define a Get/Put value pair (pointers) used with a message queue.
 */
struct xpc_gp_sn2 {
	s64 get;		/* Get value */
	s64 put;		/* Put value */
};

#define XPC_GP_SIZE \
		L1_CACHE_ALIGN(sizeof(struct xpc_gp_sn2) * XPC_MAX_NCHANNELS)

/*
 * Define a structure that contains arguments associated with opening and
 * closing a channel.
 */
struct xpc_openclose_args {
	u16 reason;		/* reason why channel is closing */
	u16 entry_size;		/* sizeof each message entry */
	u16 remote_nentries;	/* #of message entries in remote msg queue */
	u16 local_nentries;	/* #of message entries in local msg queue */
	unsigned long local_msgqueue_pa; /* phys addr of local message queue */
};

#define XPC_OPENCLOSE_ARGS_SIZE \
	      L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * \
	      XPC_MAX_NCHANNELS)


/*
 * Structures to define a fifo singly-linked list.
 */

struct xpc_fifo_entry_uv {
	struct xpc_fifo_entry_uv *next;
};

struct xpc_fifo_head_uv {
	struct xpc_fifo_entry_uv *first;
	struct xpc_fifo_entry_uv *last;
	spinlock_t lock;
	int n_entries;
};

/*
 * Define a sn2 styled message.
 *
 * A user-defined message resides in the payload area. The max size of the
 * payload is defined by the user via xpc_connect().
 *
 * The size of a message entry (within a message queue) must be a 128-byte
 * cacheline sized multiple in order to facilitate the BTE transfer of messages
 * from one message queue to another.
 */
struct xpc_msg_sn2 {
	u8 flags;		/* FOR XPC INTERNAL USE ONLY */
	u8 reserved[7];		/* FOR XPC INTERNAL USE ONLY */
	s64 number;		/* FOR XPC INTERNAL USE ONLY */

	u64 payload;		/* user defined portion of message */
};

/* struct xpc_msg_sn2 flags */

#define	XPC_M_SN2_DONE		0x01	/* msg has been received/consumed */
#define	XPC_M_SN2_READY		0x02	/* msg is ready to be sent */
#define	XPC_M_SN2_INTERRUPT	0x04	/* send interrupt when msg consumed */

/*
 * The format of a uv XPC notify_mq GRU message is as follows:
 *
 * A user-defined message resides in the payload area. The max size of the
 * payload is defined by the user via xpc_connect().
 *
 * The size of a message (payload and header) sent via the GRU must be either 1
 * or 2 GRU_CACHE_LINE_BYTES in length.
 */

struct xpc_notify_mq_msghdr_uv {
	union {
		unsigned int gru_msg_hdr;	/* FOR GRU INTERNAL USE ONLY */
		struct xpc_fifo_entry_uv next;	/* FOR XPC INTERNAL USE ONLY */
	} u;
	short partid;		/* FOR XPC INTERNAL USE ONLY */
	u8 ch_number;		/* FOR XPC INTERNAL USE ONLY */
	u8 size;		/* FOR XPC INTERNAL USE ONLY */
	unsigned int msg_slot_number;	/* FOR XPC INTERNAL USE ONLY */
};

struct xpc_notify_mq_msg_uv {
	struct xpc_notify_mq_msghdr_uv hdr;
	unsigned long payload;
};

/*
 * Define sn2's notify entry.
 *
 * This is used to notify a message's sender that their message was received
 * and consumed by the intended recipient.
 */
struct xpc_notify_sn2 {
	u8 type;		/* type of notification */

	/* the following two fields are only used if type == XPC_N_CALL */
	xpc_notify_func func;	/* user's notify function */
	void *key;		/* pointer to user's key */
};

/* struct xpc_notify_sn2 type of notification */

#define	XPC_N_CALL	0x01	/* notify function provided by user */

/*
 * Define uv's version of the notify entry. It additionally is used to allocate
 * a msg slot on the remote partition into which is copied a sent message.
 */
struct xpc_send_msg_slot_uv {
	struct xpc_fifo_entry_uv next;
	unsigned int msg_slot_number;
	xpc_notify_func func;	/* user's notify function */
	void *key;		/* pointer to user's key */
};

/*
 * Define the structure that manages all the stuff required by a channel. In
 * particular, they are used to manage the messages sent across the channel.
 *
 * This structure is private to a partition, and is NOT shared across the
 * partition boundary.
 *
 * There is an array of these structures for each remote partition. It is
 * allocated at the time a partition becomes active. The array contains one
 * of these structures for each potential channel connection to that partition.
 */

/*
 * The following is sn2 only.
 *
 * Each channel structure manages two message queues (circular buffers).
 * They are allocated at the time a channel connection is made. One of
 * these message queues (local_msgqueue) holds the locally created messages
 * that are destined for the remote partition. The other of these message
 * queues (remote_msgqueue) is a locally cached copy of the remote partition's
 * own local_msgqueue.
 *
 * The following is a description of the Get/Put pointers used to manage these
 * two message queues. Consider the local_msgqueue to be on one partition
 * and the remote_msgqueue to be its cached copy on another partition. A
 * description of what each of the lettered areas contains is included.
 *
 *
 *                     local_msgqueue      remote_msgqueue
 *
 *                        |/////////|      |/////////|
 *    w_remote_GP.get --> +---------+      |/////////|
 *                        |    F    |      |/////////|
 *     remote_GP.get  --> +---------+      +---------+ <-- local_GP->get
 *                        |         |      |         |
 *                        |         |      |    E    |
 *                        |         |      |         |
 *                        |         |      +---------+ <-- w_local_GP.get
 *                        |    B    |      |/////////|
 *                        |         |      |////D////|
 *                        |         |      |/////////|
 *                        |         |      +---------+ <-- w_remote_GP.put
 *                        |         |      |////C////|
 *      local_GP->put --> +---------+      +---------+ <-- remote_GP.put
 *                        |         |      |/////////|
 *                        |    A    |      |/////////|
 *                        |         |      |/////////|
 *     w_local_GP.put --> +---------+      |/////////|
 *                        |/////////|      |/////////|
 *
 *
 *	    ( remote_GP.[get|put] are cached copies of the remote
 *	      partition's local_GP->[get|put], and thus their values can
 *	      lag behind their counterparts on the remote partition. )
 *
 *
 *  A - Messages that have been allocated, but have not yet been sent to the
 *	remote partition.
 *
 *  B - Messages that have been sent, but have not yet been acknowledged by the
 *      remote partition as having been received.
 *
 *  C - Area that needs to be prepared for the copying of sent messages, by
 *	the clearing of the message flags of any previously received messages.
 *
 *  D - Area into which sent messages are to be copied from the remote
 *	partition's local_msgqueue and then delivered to their intended
 *	recipients. [ To allow for a multi-message copy, another pointer
 *	(next_msg_to_pull) has been added to keep track of the next message
 *	number needing to be copied (pulled). It chases after w_remote_GP.put.
 *	Any messages lying between w_local_GP.get and next_msg_to_pull have
 *	been copied and are ready to be delivered. ]
 *
 *  E - Messages that have been copied and delivered, but have not yet been
 *	acknowledged by the recipient as having been received.
 *
 *  F - Messages that have been acknowledged, but XPC has not yet notified the
 *	sender that the message was received by its intended recipient.
 *	This is also an area that needs to be prepared for the allocating of
 *	new messages, by the clearing of the message flags of the acknowledged
 *	messages.
 */

struct xpc_channel_sn2 {
	struct xpc_openclose_args *local_openclose_args; /* args passed on */
					     /* opening or closing of channel */

	void *local_msgqueue_base;	/* base address of kmalloc'd space */
	struct xpc_msg_sn2 *local_msgqueue;	/* local message queue */
	void *remote_msgqueue_base;	/* base address of kmalloc'd space */
	struct xpc_msg_sn2 *remote_msgqueue; /* cached copy of remote */
					   /* partition's local message queue */
	unsigned long remote_msgqueue_pa; /* phys addr of remote partition's */
					  /* local message queue */

	struct xpc_notify_sn2 *notify_queue;/* notify queue for messages sent */

	/* various flavors of local and remote Get/Put values */

	struct xpc_gp_sn2 *local_GP;	/* local Get/Put values */
	struct xpc_gp_sn2 remote_GP;	/* remote Get/Put values */
	struct xpc_gp_sn2 w_local_GP;	/* working local Get/Put values */
	struct xpc_gp_sn2 w_remote_GP;	/* working remote Get/Put values */
	s64 next_msg_to_pull;	/* Put value of next msg to pull */

	struct mutex msg_to_pull_mutex;	/* next msg to pull serialization */
};

struct xpc_channel_uv {
	unsigned long remote_notify_mq_gpa;	/* gru phys address of remote */
						/* partition's notify mq */

	struct xpc_send_msg_slot_uv *send_msg_slots;
	struct xpc_notify_mq_msg_uv *recv_msg_slots;

	struct xpc_fifo_head_uv msg_slot_free_list;
	struct xpc_fifo_head_uv recv_msg_list;	/* deliverable payloads */
};

struct xpc_channel {
	short partid;		/* ID of remote partition connected */
	spinlock_t lock;	/* lock for updating this structure */
	unsigned int flags;	/* general flags */

	enum xp_retval reason;	/* reason why channel is disconnect'g */
	int reason_line;	/* line# disconnect initiated from */

	u16 number;		/* channel # */

	u16 entry_size;		/* sizeof each msg entry */
	u16 local_nentries;	/* #of msg entries in local msg queue */
	u16 remote_nentries;	/* #of msg entries in remote msg queue */

	atomic_t references;	/* #of external references to queues */

	atomic_t n_on_msg_allocate_wq;	/* #on msg allocation wait queue */
	wait_queue_head_t msg_allocate_wq;	/* msg allocation wait queue */

	u8 delayed_chctl_flags;	/* chctl flags received, but delayed */
				/* action until channel disconnected */

	atomic_t n_to_notify;	/* #of msg senders to notify */

	xpc_channel_func func;	/* user's channel function */
	void *key;		/* pointer to user's key */

	struct completion wdisconnect_wait;    /* wait for channel disconnect */

	/* kthread management related fields */

	atomic_t kthreads_assigned;	/* #of kthreads assigned to channel */
	u32 kthreads_assigned_limit;	/* limit on #of kthreads assigned */
	atomic_t kthreads_idle;	/* #of kthreads idle waiting for work */
	u32 kthreads_idle_limit;	/* limit on #of kthreads idle */
	atomic_t kthreads_active;	/* #of kthreads actively working */

	wait_queue_head_t idle_wq;	/* idle kthread wait queue */

	union {
		struct xpc_channel_sn2 sn2;
		struct xpc_channel_uv uv;
	} sn;

} ____cacheline_aligned;

/* struct xpc_channel flags */

#define	XPC_C_WASCONNECTED	0x00000001	/* channel was connected */

#define	XPC_C_ROPENREPLY	0x00000002	/* remote open channel reply */
#define	XPC_C_OPENREPLY		0x00000004	/* local open channel reply */
#define	XPC_C_ROPENREQUEST	0x00000008     /* remote open channel request */
#define	XPC_C_OPENREQUEST	0x00000010	/* local open channel request */

#define	XPC_C_SETUP		0x00000020 /* channel's msgqueues are alloc'd */
#define	XPC_C_CONNECTEDCALLOUT	0x00000040     /* connected callout initiated */
#define	XPC_C_CONNECTEDCALLOUT_MADE \
				0x00000080     /* connected callout completed */
#define	XPC_C_CONNECTED		0x00000100	/* local channel is connected */
#define	XPC_C_CONNECTING	0x00000200	/* channel is being connected */

#define	XPC_C_RCLOSEREPLY	0x00000400	/* remote close channel reply */
#define	XPC_C_CLOSEREPLY	0x00000800	/* local close channel reply */
#define	XPC_C_RCLOSEREQUEST	0x00001000    /* remote close channel request */
#define	XPC_C_CLOSEREQUEST	0x00002000     /* local close channel request */

#define	XPC_C_DISCONNECTED	0x00004000	/* channel is disconnected */
#define	XPC_C_DISCONNECTING	0x00008000   /* channel is being disconnected */
#define	XPC_C_DISCONNECTINGCALLOUT \
				0x00010000 /* disconnecting callout initiated */
#define	XPC_C_DISCONNECTINGCALLOUT_MADE \
				0x00020000 /* disconnecting callout completed */
#define	XPC_C_WDISCONNECT	0x00040000  /* waiting for channel disconnect */

/*
 * The channel control flags (chctl) union consists of a 64-bit variable which
 * is divided up into eight bytes, ordered from right to left. Byte zero
 * pertains to channel 0, byte one to channel 1, and so on. Each channel's byte
 * can have one or more of the chctl flags set in it.
 */

union xpc_channel_ctl_flags {
	u64 all_flags;
	u8 flags[XPC_MAX_NCHANNELS];
};

/* chctl flags */
#define	XPC_CHCTL_CLOSEREQUEST	0x01
#define	XPC_CHCTL_CLOSEREPLY	0x02
#define	XPC_CHCTL_OPENREQUEST	0x04
#define	XPC_CHCTL_OPENREPLY	0x08
#define	XPC_CHCTL_MSGREQUEST	0x10

#define XPC_OPENCLOSE_CHCTL_FLAGS \
			(XPC_CHCTL_CLOSEREQUEST | XPC_CHCTL_CLOSEREPLY | \
			 XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY)
#define XPC_MSG_CHCTL_FLAGS	XPC_CHCTL_MSGREQUEST

static inline int
xpc_any_openclose_chctl_flags_set(union xpc_channel_ctl_flags *chctl)
{
	int ch_number;

	for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) {
		if (chctl->flags[ch_number] & XPC_OPENCLOSE_CHCTL_FLAGS)
			return 1;
	}
	return 0;
}

static inline int
xpc_any_msg_chctl_flags_set(union xpc_channel_ctl_flags *chctl)
{
	int ch_number;

	for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) {
		if (chctl->flags[ch_number] & XPC_MSG_CHCTL_FLAGS)
			return 1;
	}
	return 0;
}

/*
 * Manage channels on a partition basis. There is one of these structures
 * for each partition (a partition will never utilize the structure that
 * represents itself).
 */

struct xpc_partition_sn2 {
	unsigned long remote_amos_page_pa; /* paddr of partition's amos page */
	int activate_IRQ_nasid;	/* active partition's act/deact nasid */
	int activate_IRQ_phys_cpuid;	/* active part's act/deact phys cpuid */

	unsigned long remote_vars_pa;	/* phys addr of partition's vars */
	unsigned long remote_vars_part_pa; /* paddr of partition's vars part */
	u8 remote_vars_version;	/* version# of partition's vars */

	void *local_GPs_base;	/* base address of kmalloc'd space */
	struct xpc_gp_sn2 *local_GPs;	/* local Get/Put values */
	void *remote_GPs_base;	/* base address of kmalloc'd space */
	struct xpc_gp_sn2 *remote_GPs;	/* copy of remote partition's local */
					/* Get/Put values */
	unsigned long remote_GPs_pa; /* phys addr of remote partition's local */
				     /* Get/Put values */

	void *local_openclose_args_base;   /* base address of kmalloc'd space */
	struct xpc_openclose_args *local_openclose_args;      /* local's args */
	unsigned long remote_openclose_args_pa;	/* phys addr of remote's args */

	int notify_IRQ_nasid;	/* nasid of where to send notify IRQs */
	int notify_IRQ_phys_cpuid;	/* CPUID of where to send notify IRQs */
	char notify_IRQ_owner[8];	/* notify IRQ's owner's name */

	struct amo *remote_chctl_amo_va; /* addr of remote chctl flags' amo */
	struct amo *local_chctl_amo_va;	/* address of chctl flags' amo */

	struct timer_list dropped_notify_IRQ_timer;	/* dropped IRQ timer */
};

struct xpc_partition_uv {
	unsigned long remote_activate_mq_gpa;	/* gru phys address of remote */
						/* partition's activate mq */
	spinlock_t flags_lock;	/* protect updating of flags */
	unsigned int flags;	/* general flags */
	u8 remote_act_state;	/* remote partition's act_state */
	u8 act_state_req;	/* act_state request from remote partition */
	enum xp_retval reason;	/* reason for deactivate act_state request */
	u64 heartbeat;		/* incremented by remote partition */
};

/* struct xpc_partition_uv flags */

#define XPC_P_HEARTBEAT_OFFLINE_UV	0x00000001
#define XPC_P_ENGAGED_UV		0x00000002

/* struct xpc_partition_uv act_state change requests */

#define XPC_P_ASR_ACTIVATE_UV		0x01
#define XPC_P_ASR_REACTIVATE_UV		0x02
#define XPC_P_ASR_DEACTIVATE_UV		0x03

struct xpc_partition {

	/* XPC HB infrastructure */

	u8 remote_rp_version;	/* version# of partition's rsvd pg */
	unsigned long remote_rp_ts_jiffies; /* timestamp when rsvd pg setup */
	unsigned long remote_rp_pa;	/* phys addr of partition's rsvd pg */
	u64 last_heartbeat;	/* HB at last read */
	u32 activate_IRQ_rcvd;	/* IRQs since activation */
	spinlock_t act_lock;	/* protect updating of act_state */
	u8 act_state;		/* from XPC HB viewpoint */
	enum xp_retval reason;	/* reason partition is deactivating */
	int reason_line;	/* line# deactivation initiated from */

	unsigned long disengage_timeout;	/* timeout in jiffies */
	struct timer_list disengage_timer;

	/* XPC infrastructure referencing and teardown control */

	u8 setup_state;		/* infrastructure setup state */
	wait_queue_head_t teardown_wq;	/* kthread waiting to teardown infra */
	atomic_t references;	/* #of references to infrastructure */

	u8 nchannels;		/* #of defined channels supported */
	atomic_t nchannels_active;  /* #of channels that are not DISCONNECTED */
	atomic_t nchannels_engaged;  /* #of channels engaged with remote part */
	struct xpc_channel *channels;	/* array of channel structures */

	/* fields used for managing channel avialability and activity */

	union xpc_channel_ctl_flags chctl; /* chctl flags yet to be processed */
	spinlock_t chctl_lock;	/* chctl flags lock */

	void *remote_openclose_args_base;  /* base address of kmalloc'd space */
	struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */
							  /* args */

	/* channel manager related fields */

	atomic_t channel_mgr_requests;	/* #of requests to activate chan mgr */
	wait_queue_head_t channel_mgr_wq;	/* channel mgr's wait queue */

	union {
		struct xpc_partition_sn2 sn2;
		struct xpc_partition_uv uv;
	} sn;

} ____cacheline_aligned;

/* struct xpc_partition act_state values (for XPC HB) */

#define	XPC_P_AS_INACTIVE	0x00	/* partition is not active */
#define XPC_P_AS_ACTIVATION_REQ	0x01	/* created thread to activate */
#define XPC_P_AS_ACTIVATING	0x02	/* activation thread started */
#define XPC_P_AS_ACTIVE		0x03	/* xpc_partition_up() was called */
#define XPC_P_AS_DEACTIVATING	0x04	/* partition deactivation initiated */

#define XPC_DEACTIVATE_PARTITION(_p, _reason) \
			xpc_deactivate_partition(__LINE__, (_p), (_reason))

/* struct xpc_partition setup_state values */

#define XPC_P_SS_UNSET		0x00	/* infrastructure was never setup */
#define XPC_P_SS_SETUP		0x01	/* infrastructure is setup */
#define XPC_P_SS_WTEARDOWN	0x02	/* waiting to teardown infrastructure */
#define XPC_P_SS_TORNDOWN	0x03	/* infrastructure is torndown */

/*
 * struct xpc_partition_sn2's dropped notify IRQ timer is set to wait the
 * following interval #of seconds before checking for dropped notify IRQs.
 * These can occur whenever an IRQ's associated amo write doesn't complete
 * until after the IRQ was received.
 */
#define XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL	(0.25 * HZ)

/* number of seconds to wait for other partitions to disengage */
#define XPC_DISENGAGE_DEFAULT_TIMELIMIT		90

/* interval in seconds to print 'waiting deactivation' messages */
#define XPC_DEACTIVATE_PRINTMSG_INTERVAL	10

#define XPC_PARTID(_p)	((short)((_p) - &xpc_partitions[0]))

/* found in xp_main.c */
extern struct xpc_registration xpc_registrations[];

/* found in xpc_main.c */
extern struct device *xpc_part;
extern struct device *xpc_chan;
extern int xpc_disengage_timelimit;
extern int xpc_disengage_timedout;
extern int xpc_activate_IRQ_rcvd;
extern spinlock_t xpc_activate_IRQ_rcvd_lock;
extern wait_queue_head_t xpc_activate_IRQ_wq;
extern void *xpc_heartbeating_to_mask;
extern void *xpc_kzalloc_cacheline_aligned(size_t, gfp_t, void **);
extern void xpc_activate_partition(struct xpc_partition *);
extern void xpc_activate_kthreads(struct xpc_channel *, int);
extern void xpc_create_kthreads(struct xpc_channel *, int, int);
extern void xpc_disconnect_wait(int);
extern int (*xpc_setup_partitions_sn) (void);
extern enum xp_retval (*xpc_get_partition_rsvd_page_pa) (void *, u64 *,
							 unsigned long *,
							 size_t *);
extern int (*xpc_setup_rsvd_page_sn) (struct xpc_rsvd_page *);
extern void (*xpc_heartbeat_init) (void);
extern void (*xpc_heartbeat_exit) (void);
extern void (*xpc_increment_heartbeat) (void);
extern void (*xpc_offline_heartbeat) (void);
extern void (*xpc_online_heartbeat) (void);
extern enum xp_retval (*xpc_get_remote_heartbeat) (struct xpc_partition *);
extern enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *);
extern u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *);
extern enum xp_retval (*xpc_setup_msg_structures) (struct xpc_channel *);
extern void (*xpc_teardown_msg_structures) (struct xpc_channel *);
extern void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *);
extern void (*xpc_process_msg_chctl_flags) (struct xpc_partition *, int);
extern int (*xpc_n_of_deliverable_payloads) (struct xpc_channel *);
extern void *(*xpc_get_deliverable_payload) (struct xpc_channel *);
extern void (*xpc_request_partition_activation) (struct xpc_rsvd_page *,
						 unsigned long, int);
extern void (*xpc_request_partition_reactivation) (struct xpc_partition *);
extern void (*xpc_request_partition_deactivation) (struct xpc_partition *);
extern void (*xpc_cancel_partition_deactivation_request) (
							struct xpc_partition *);
extern void (*xpc_process_activate_IRQ_rcvd) (void);
extern enum xp_retval (*xpc_setup_ch_structures_sn) (struct xpc_partition *);
extern void (*xpc_teardown_ch_structures_sn) (struct xpc_partition *);

extern void (*xpc_indicate_partition_engaged) (struct xpc_partition *);
extern int (*xpc_partition_engaged) (short);
extern int (*xpc_any_partition_engaged) (void);
extern void (*xpc_indicate_partition_disengaged) (struct xpc_partition *);
extern void (*xpc_assume_partition_disengaged) (short);

extern void (*xpc_send_chctl_closerequest) (struct xpc_channel *,
					    unsigned long *);
extern void (*xpc_send_chctl_closereply) (struct xpc_channel *,
					  unsigned long *);
extern void (*xpc_send_chctl_openrequest) (struct xpc_channel *,
					   unsigned long *);
extern void (*xpc_send_chctl_openreply) (struct xpc_channel *, unsigned long *);

extern void (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *,
					    unsigned long);

extern enum xp_retval (*xpc_send_payload) (struct xpc_channel *, u32, void *,
					   u16, u8, xpc_notify_func, void *);
extern void (*xpc_received_payload) (struct xpc_channel *, void *);

/* found in xpc_sn2.c */
extern int xpc_init_sn2(void);
extern void xpc_exit_sn2(void);

/* found in xpc_uv.c */
extern int xpc_init_uv(void);
extern void xpc_exit_uv(void);

/* found in xpc_partition.c */
extern int xpc_exiting;
extern int xpc_nasid_mask_nlongs;
extern struct xpc_rsvd_page *xpc_rsvd_page;
extern unsigned long *xpc_mach_nasids;
extern struct xpc_partition *xpc_partitions;
extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **);
extern int xpc_setup_rsvd_page(void);
extern void xpc_teardown_rsvd_page(void);
extern int xpc_identify_activate_IRQ_sender(void);
extern int xpc_partition_disengaged(struct xpc_partition *);
extern enum xp_retval xpc_mark_partition_active(struct xpc_partition *);
extern void xpc_mark_partition_inactive(struct xpc_partition *);
extern void xpc_discovery(void);
extern enum xp_retval xpc_get_remote_rp(int, unsigned long *,
					struct xpc_rsvd_page *,
					unsigned long *);
extern void xpc_deactivate_partition(const int, struct xpc_partition *,
				     enum xp_retval);
extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *);

/* found in xpc_channel.c */
extern void xpc_initiate_connect(int);
extern void xpc_initiate_disconnect(int);
extern enum xp_retval xpc_allocate_msg_wait(struct xpc_channel *);
extern enum xp_retval xpc_initiate_send(short, int, u32, void *, u16);
extern enum xp_retval xpc_initiate_send_notify(short, int, u32, void *, u16,
					       xpc_notify_func, void *);
extern void xpc_initiate_received(short, int, void *);
extern void xpc_process_sent_chctl_flags(struct xpc_partition *);
extern void xpc_connected_callout(struct xpc_channel *);
extern void xpc_deliver_payload(struct xpc_channel *);
extern void xpc_disconnect_channel(const int, struct xpc_channel *,
				   enum xp_retval, unsigned long *);
extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval);
extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval);

static inline int
xpc_hb_allowed(short partid, void *heartbeating_to_mask)
{
	return test_bit(partid, heartbeating_to_mask);
}

static inline int
xpc_any_hbs_allowed(void)
{
	DBUG_ON(xpc_heartbeating_to_mask == NULL);
	return !bitmap_empty(xpc_heartbeating_to_mask, xp_max_npartitions);
}

static inline void
xpc_allow_hb(short partid)
{
	DBUG_ON(xpc_heartbeating_to_mask == NULL);
	set_bit(partid, xpc_heartbeating_to_mask);
}

static inline void
xpc_disallow_hb(short partid)
{
	DBUG_ON(xpc_heartbeating_to_mask == NULL);
	clear_bit(partid, xpc_heartbeating_to_mask);
}

static inline void
xpc_disallow_all_hbs(void)
{
	DBUG_ON(xpc_heartbeating_to_mask == NULL);
	bitmap_zero(xpc_heartbeating_to_mask, xp_max_npartitions);
}

static inline void
xpc_wakeup_channel_mgr(struct xpc_partition *part)
{
	if (atomic_inc_return(&part->channel_mgr_requests) == 1)
		wake_up(&part->channel_mgr_wq);
}

/*
 * These next two inlines are used to keep us from tearing down a channel's
 * msg queues while a thread may be referencing them.
 */
static inline void
xpc_msgqueue_ref(struct xpc_channel *ch)
{
	atomic_inc(&ch->references);
}

static inline void
xpc_msgqueue_deref(struct xpc_channel *ch)
{
	s32 refs = atomic_dec_return(&ch->references);

	DBUG_ON(refs < 0);
	if (refs == 0)
		xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]);
}

#define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \
		xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs)

/*
 * These two inlines are used to keep us from tearing down a partition's
 * setup infrastructure while a thread may be referencing it.
 */
static inline void
xpc_part_deref(struct xpc_partition *part)
{
	s32 refs = atomic_dec_return(&part->references);

	DBUG_ON(refs < 0);
	if (refs == 0 && part->setup_state == XPC_P_SS_WTEARDOWN)
		wake_up(&part->teardown_wq);
}

static inline int
xpc_part_ref(struct xpc_partition *part)
{
	int setup;

	atomic_inc(&part->references);
	setup = (part->setup_state == XPC_P_SS_SETUP);
	if (!setup)
		xpc_part_deref(part);

	return setup;
}

/*
 * The following macro is to be used for the setting of the reason and
 * reason_line fields in both the struct xpc_channel and struct xpc_partition
 * structures.
 */
#define XPC_SET_REASON(_p, _reason, _line) \
	{ \
		(_p)->reason = _reason; \
		(_p)->reason_line = _line; \
	}

#endif /* _DRIVERS_MISC_SGIXP_XPC_H */
OpenPOWER on IntegriCloud