summaryrefslogtreecommitdiffstats
path: root/drivers/hv/hyperv_vmbus.h
blob: 3d70e36c918ef3202362daa608eb86bd2fce2281 (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
/*
 *
 * Copyright (c) 2011, Microsoft Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 * Authors:
 *   Haiyang Zhang <haiyangz@microsoft.com>
 *   Hank Janssen  <hjanssen@microsoft.com>
 *   K. Y. Srinivasan <kys@microsoft.com>
 *
 */

#ifndef _HYPERV_VMBUS_H
#define _HYPERV_VMBUS_H

#include <linux/list.h>
#include <asm/sync_bitops.h>
#include <linux/atomic.h>
#include <linux/hyperv.h>

/*
 * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
 * is set by CPUID(HVCPUID_VERSION_FEATURES).
 */
enum hv_cpuid_function {
	HVCPUID_VERSION_FEATURES		= 0x00000001,
	HVCPUID_VENDOR_MAXFUNCTION		= 0x40000000,
	HVCPUID_INTERFACE			= 0x40000001,

	/*
	 * The remaining functions depend on the value of
	 * HVCPUID_INTERFACE
	 */
	HVCPUID_VERSION			= 0x40000002,
	HVCPUID_FEATURES			= 0x40000003,
	HVCPUID_ENLIGHTENMENT_INFO	= 0x40000004,
	HVCPUID_IMPLEMENTATION_LIMITS		= 0x40000005,
};

#define  HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE   0x400

#define HV_X64_MSR_CRASH_P0   0x40000100
#define HV_X64_MSR_CRASH_P1   0x40000101
#define HV_X64_MSR_CRASH_P2   0x40000102
#define HV_X64_MSR_CRASH_P3   0x40000103
#define HV_X64_MSR_CRASH_P4   0x40000104
#define HV_X64_MSR_CRASH_CTL  0x40000105

#define HV_CRASH_CTL_CRASH_NOTIFY (1ULL << 63)

/* Define version of the synthetic interrupt controller. */
#define HV_SYNIC_VERSION		(1)

/* Define the expected SynIC version. */
#define HV_SYNIC_VERSION_1		(0x1)

/* Define synthetic interrupt controller message constants. */
#define HV_MESSAGE_SIZE			(256)
#define HV_MESSAGE_PAYLOAD_BYTE_COUNT	(240)
#define HV_MESSAGE_PAYLOAD_QWORD_COUNT	(30)
#define HV_ANY_VP			(0xFFFFFFFF)

/* Define synthetic interrupt controller flag constants. */
#define HV_EVENT_FLAGS_COUNT		(256 * 8)
#define HV_EVENT_FLAGS_BYTE_COUNT	(256)
#define HV_EVENT_FLAGS_DWORD_COUNT	(256 / sizeof(u32))

/* Define hypervisor message types. */
enum hv_message_type {
	HVMSG_NONE			= 0x00000000,

	/* Memory access messages. */
	HVMSG_UNMAPPED_GPA		= 0x80000000,
	HVMSG_GPA_INTERCEPT		= 0x80000001,

	/* Timer notification messages. */
	HVMSG_TIMER_EXPIRED			= 0x80000010,

	/* Error messages. */
	HVMSG_INVALID_VP_REGISTER_VALUE	= 0x80000020,
	HVMSG_UNRECOVERABLE_EXCEPTION	= 0x80000021,
	HVMSG_UNSUPPORTED_FEATURE		= 0x80000022,

	/* Trace buffer complete messages. */
	HVMSG_EVENTLOG_BUFFERCOMPLETE	= 0x80000040,

	/* Platform-specific processor intercept messages. */
	HVMSG_X64_IOPORT_INTERCEPT		= 0x80010000,
	HVMSG_X64_MSR_INTERCEPT		= 0x80010001,
	HVMSG_X64_CPUID_INTERCEPT		= 0x80010002,
	HVMSG_X64_EXCEPTION_INTERCEPT	= 0x80010003,
	HVMSG_X64_APIC_EOI			= 0x80010004,
	HVMSG_X64_LEGACY_FP_ERROR		= 0x80010005
};

/* Define the number of synthetic interrupt sources. */
#define HV_SYNIC_SINT_COUNT		(16)
#define HV_SYNIC_STIMER_COUNT		(4)

/* Define invalid partition identifier. */
#define HV_PARTITION_ID_INVALID		((u64)0x0)

/* Define port identifier type. */
union hv_port_id {
	u32 asu32;
	struct {
		u32 id:24;
		u32 reserved:8;
	} u ;
};

/* Define port type. */
enum hv_port_type {
	HVPORT_MSG	= 1,
	HVPORT_EVENT		= 2,
	HVPORT_MONITOR	= 3
};

/* Define port information structure. */
struct hv_port_info {
	enum hv_port_type port_type;
	u32 padding;
	union {
		struct {
			u32 target_sint;
			u32 target_vp;
			u64 rsvdz;
		} message_port_info;
		struct {
			u32 target_sint;
			u32 target_vp;
			u16 base_flag_number;
			u16 flag_count;
			u32 rsvdz;
		} event_port_info;
		struct {
			u64 monitor_address;
			u64 rsvdz;
		} monitor_port_info;
	};
};

struct hv_connection_info {
	enum hv_port_type port_type;
	u32 padding;
	union {
		struct {
			u64 rsvdz;
		} message_connection_info;
		struct {
			u64 rsvdz;
		} event_connection_info;
		struct {
			u64 monitor_address;
		} monitor_connection_info;
	};
};

/* Define synthetic interrupt controller message flags. */
union hv_message_flags {
	u8 asu8;
	struct {
		u8 msg_pending:1;
		u8 reserved:7;
	};
};

/* Define synthetic interrupt controller message header. */
struct hv_message_header {
	enum hv_message_type message_type;
	u8 payload_size;
	union hv_message_flags message_flags;
	u8 reserved[2];
	union {
		u64 sender;
		union hv_port_id port;
	};
};

/*
 * Timer configuration register.
 */
union hv_timer_config {
	u64 as_uint64;
	struct {
		u64 enable:1;
		u64 periodic:1;
		u64 lazy:1;
		u64 auto_enable:1;
		u64 reserved_z0:12;
		u64 sintx:4;
		u64 reserved_z1:44;
	};
};


/* Define timer message payload structure. */
struct hv_timer_message_payload {
	u32 timer_index;
	u32 reserved;
	u64 expiration_time;	/* When the timer expired */
	u64 delivery_time;	/* When the message was delivered */
};

/* Define synthetic interrupt controller message format. */
struct hv_message {
	struct hv_message_header header;
	union {
		u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
	} u ;
};

/* Define the number of message buffers associated with each port. */
#define HV_PORT_MESSAGE_BUFFER_COUNT	(16)

/* Define the synthetic interrupt message page layout. */
struct hv_message_page {
	struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
};

/* Define the synthetic interrupt controller event flags format. */
union hv_synic_event_flags {
	u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
	u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
};

/* Define the synthetic interrupt flags page layout. */
struct hv_synic_event_flags_page {
	union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
};

/* Define SynIC control register. */
union hv_synic_scontrol {
	u64 as_uint64;
	struct {
		u64 enable:1;
		u64 reserved:63;
	};
};

/* Define synthetic interrupt source. */
union hv_synic_sint {
	u64 as_uint64;
	struct {
		u64 vector:8;
		u64 reserved1:8;
		u64 masked:1;
		u64 auto_eoi:1;
		u64 reserved2:46;
	};
};

/* Define the format of the SIMP register */
union hv_synic_simp {
	u64 as_uint64;
	struct {
		u64 simp_enabled:1;
		u64 preserved:11;
		u64 base_simp_gpa:52;
	};
};

/* Define the format of the SIEFP register */
union hv_synic_siefp {
	u64 as_uint64;
	struct {
		u64 siefp_enabled:1;
		u64 preserved:11;
		u64 base_siefp_gpa:52;
	};
};

/* Definitions for the monitored notification facility */
union hv_monitor_trigger_group {
	u64 as_uint64;
	struct {
		u32 pending;
		u32 armed;
	};
};

struct hv_monitor_parameter {
	union hv_connection_id connectionid;
	u16 flagnumber;
	u16 rsvdz;
};

union hv_monitor_trigger_state {
	u32 asu32;

	struct {
		u32 group_enable:4;
		u32 rsvdz:28;
	};
};

/* struct hv_monitor_page Layout */
/* ------------------------------------------------------ */
/* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
/* | 8   | TriggerGroup[0]                              | */
/* | 10  | TriggerGroup[1]                              | */
/* | 18  | TriggerGroup[2]                              | */
/* | 20  | TriggerGroup[3]                              | */
/* | 28  | Rsvd2[0]                                     | */
/* | 30  | Rsvd2[1]                                     | */
/* | 38  | Rsvd2[2]                                     | */
/* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
/* | ...                                                | */
/* | 240 | Latency[0][0..3]                             | */
/* | 340 | Rsvz3[0]                                     | */
/* | 440 | Parameter[0][0]                              | */
/* | 448 | Parameter[0][1]                              | */
/* | ...                                                | */
/* | 840 | Rsvd4[0]                                     | */
/* ------------------------------------------------------ */
struct hv_monitor_page {
	union hv_monitor_trigger_state trigger_state;
	u32 rsvdz1;

	union hv_monitor_trigger_group trigger_group[4];
	u64 rsvdz2[3];

	s32 next_checktime[4][32];

	u16 latency[4][32];
	u64 rsvdz3[32];

	struct hv_monitor_parameter parameter[4][32];

	u8 rsvdz4[1984];
};

/* Declare the various hypercall operations. */
enum hv_call_code {
	HVCALL_POST_MESSAGE	= 0x005c,
	HVCALL_SIGNAL_EVENT	= 0x005d,
};

/* Definition of the hv_post_message hypercall input structure. */
struct hv_input_post_message {
	union hv_connection_id connectionid;
	u32 reserved;
	enum hv_message_type message_type;
	u32 payload_size;
	u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
};

/*
 * Versioning definitions used for guests reporting themselves to the
 * hypervisor, and visa versa.
 */

/* Version info reported by guest OS's */
enum hv_guest_os_vendor {
	HVGUESTOS_VENDOR_MICROSOFT	= 0x0001
};

enum hv_guest_os_microsoft_ids {
	HVGUESTOS_MICROSOFT_UNDEFINED	= 0x00,
	HVGUESTOS_MICROSOFT_MSDOS		= 0x01,
	HVGUESTOS_MICROSOFT_WINDOWS3X	= 0x02,
	HVGUESTOS_MICROSOFT_WINDOWS9X	= 0x03,
	HVGUESTOS_MICROSOFT_WINDOWSNT	= 0x04,
	HVGUESTOS_MICROSOFT_WINDOWSCE	= 0x05
};

/*
 * Declare the MSR used to identify the guest OS.
 */
#define HV_X64_MSR_GUEST_OS_ID	0x40000000

union hv_x64_msr_guest_os_id_contents {
	u64 as_uint64;
	struct {
		u64 build_number:16;
		u64 service_version:8; /* Service Pack, etc. */
		u64 minor_version:8;
		u64 major_version:8;
		u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */
		u64 vendor_id:16; /* enum hv_guest_os_vendor */
	};
};

/*
 * Declare the MSR used to setup pages used to communicate with the hypervisor.
 */
#define HV_X64_MSR_HYPERCALL	0x40000001

union hv_x64_msr_hypercall_contents {
	u64 as_uint64;
	struct {
		u64 enable:1;
		u64 reserved:11;
		u64 guest_physical_address:52;
	};
};


enum {
	VMBUS_MESSAGE_CONNECTION_ID	= 1,
	VMBUS_MESSAGE_PORT_ID		= 1,
	VMBUS_EVENT_CONNECTION_ID	= 2,
	VMBUS_EVENT_PORT_ID		= 2,
	VMBUS_MONITOR_CONNECTION_ID	= 3,
	VMBUS_MONITOR_PORT_ID		= 3,
	VMBUS_MESSAGE_SINT		= 2,
};

/* #defines */

#define HV_PRESENT_BIT			0x80000000

/*
 * The guest OS needs to register the guest ID with the hypervisor.
 * The guest ID is a 64 bit entity and the structure of this ID is
 * specified in the Hyper-V specification:
 *
 * http://msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
 *
 * While the current guideline does not specify how Linux guest ID(s)
 * need to be generated, our plan is to publish the guidelines for
 * Linux and other guest operating systems that currently are hosted
 * on Hyper-V. The implementation here conforms to this yet
 * unpublished guidelines.
 *
 *
 * Bit(s)
 * 63 - Indicates if the OS is Open Source or not; 1 is Open Source
 * 62:56 - Os Type; Linux is 0x100
 * 55:48 - Distro specific identification
 * 47:16 - Linux kernel version number
 * 15:0  - Distro specific identification
 *
 *
 */

#define HV_LINUX_VENDOR_ID		0x8100

/*
 * Generate the guest ID based on the guideline described above.
 */

static inline  __u64 generate_guest_id(__u8 d_info1, __u32 kernel_version,
					__u16 d_info2)
{
	__u64 guest_id = 0;

	guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
	guest_id |= (((__u64)(d_info1)) << 48);
	guest_id |= (((__u64)(kernel_version)) << 16);
	guest_id |= ((__u64)(d_info2));

	return guest_id;
}


#define HV_CPU_POWER_MANAGEMENT		(1 << 0)
#define HV_RECOMMENDATIONS_MAX		4

#define HV_X64_MAX			5
#define HV_CAPS_MAX			8


#define HV_HYPERCALL_PARAM_ALIGN	sizeof(u64)


/* Service definitions */

#define HV_SERVICE_PARENT_PORT				(0)
#define HV_SERVICE_PARENT_CONNECTION			(0)

#define HV_SERVICE_CONNECT_RESPONSE_SUCCESS		(0)
#define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER	(1)
#define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE	(2)
#define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED	(3)

#define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID		(1)
#define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID		(2)
#define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID	(3)
#define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID	(4)
#define HV_SERVICE_MAX_MESSAGE_ID				(4)

#define HV_SERVICE_PROTOCOL_VERSION (0x0010)
#define HV_CONNECT_PAYLOAD_BYTE_COUNT 64

/* #define VMBUS_REVISION_NUMBER	6 */

/* Our local vmbus's port and connection id. Anything >0 is fine */
/* #define VMBUS_PORT_ID		11 */

/* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
static const uuid_le VMBUS_SERVICE_ID = {
	.b = {
		0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
		0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
	},
};



struct hv_context {
	/* We only support running on top of Hyper-V
	* So at this point this really can only contain the Hyper-V ID
	*/
	u64 guestid;

	void *hypercall_page;
	void *tsc_page;

	bool synic_initialized;

	void *synic_message_page[NR_CPUS];
	void *synic_event_page[NR_CPUS];
	/*
	 * Hypervisor's notion of virtual processor ID is different from
	 * Linux' notion of CPU ID. This information can only be retrieved
	 * in the context of the calling CPU. Setup a map for easy access
	 * to this information:
	 *
	 * vp_index[a] is the Hyper-V's processor ID corresponding to
	 * Linux cpuid 'a'.
	 */
	u32 vp_index[NR_CPUS];
	/*
	 * Starting with win8, we can take channel interrupts on any CPU;
	 * we will manage the tasklet that handles events on a per CPU
	 * basis.
	 */
	struct tasklet_struct *event_dpc[NR_CPUS];
	/*
	 * To optimize the mapping of relid to channel, maintain
	 * per-cpu list of the channels based on their CPU affinity.
	 */
	struct list_head percpu_list[NR_CPUS];
	/*
	 * buffer to post messages to the host.
	 */
	void *post_msg_page[NR_CPUS];
	/*
	 * Support PV clockevent device.
	 */
	struct clock_event_device *clk_evt[NR_CPUS];
	/*
	 * To manage allocations in a NUMA node.
	 * Array indexed by numa node ID.
	 */
	struct cpumask *hv_numa_map;
};

extern struct hv_context hv_context;

struct ms_hyperv_tsc_page {
	volatile u32 tsc_sequence;
	u32 reserved1;
	volatile u64 tsc_scale;
	volatile s64 tsc_offset;
	u64 reserved2[509];
};

struct hv_ring_buffer_debug_info {
	u32 current_interrupt_mask;
	u32 current_read_index;
	u32 current_write_index;
	u32 bytes_avail_toread;
	u32 bytes_avail_towrite;
};

/* Hv Interface */

extern int hv_init(void);

extern void hv_cleanup(void);

extern int hv_post_message(union hv_connection_id connection_id,
			 enum hv_message_type message_type,
			 void *payload, size_t payload_size);

extern u16 hv_signal_event(void *con_id);

extern int hv_synic_alloc(void);

extern void hv_synic_free(void);

extern void hv_synic_init(void *irqarg);

extern void hv_synic_cleanup(void *arg);

extern void hv_synic_clockevents_cleanup(void);

/*
 * Host version information.
 */
extern unsigned int host_info_eax;
extern unsigned int host_info_ebx;
extern unsigned int host_info_ecx;
extern unsigned int host_info_edx;

/* Interface */


int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer,
		   u32 buflen);

void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);

int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
		    struct kvec *kv_list,
		    u32 kv_count, bool *signal);

int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
		   u32 buflen);

int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
		   void *buffer,
		   u32 buflen,
		   u32 offset, bool *signal);


void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
			    struct hv_ring_buffer_debug_info *debug_info);

void hv_begin_read(struct hv_ring_buffer_info *rbi);

u32 hv_end_read(struct hv_ring_buffer_info *rbi);

/*
 * Maximum channels is determined by the size of the interrupt page
 * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
 * and the other is receive endpoint interrupt
 */
#define MAX_NUM_CHANNELS	((PAGE_SIZE >> 1) << 3)	/* 16348 channels */

/* The value here must be in multiple of 32 */
/* TODO: Need to make this configurable */
#define MAX_NUM_CHANNELS_SUPPORTED	256


enum vmbus_connect_state {
	DISCONNECTED,
	CONNECTING,
	CONNECTED,
	DISCONNECTING
};

#define MAX_SIZE_CHANNEL_MESSAGE	HV_MESSAGE_PAYLOAD_BYTE_COUNT

struct vmbus_connection {
	enum vmbus_connect_state conn_state;

	atomic_t next_gpadl_handle;

	struct completion  unload_event;
	/*
	 * Represents channel interrupts. Each bit position represents a
	 * channel.  When a channel sends an interrupt via VMBUS, it finds its
	 * bit in the sendInterruptPage, set it and calls Hv to generate a port
	 * event. The other end receives the port event and parse the
	 * recvInterruptPage to see which bit is set
	 */
	void *int_page;
	void *send_int_page;
	void *recv_int_page;

	/*
	 * 2 pages - 1st page for parent->child notification and 2nd
	 * is child->parent notification
	 */
	struct hv_monitor_page *monitor_pages[2];
	struct list_head chn_msg_list;
	spinlock_t channelmsg_lock;

	/* List of channels */
	struct list_head chn_list;
	spinlock_t channel_lock;

	struct workqueue_struct *work_queue;
};


struct vmbus_msginfo {
	/* Bookkeeping stuff */
	struct list_head msglist_entry;

	/* The message itself */
	unsigned char msg[0];
};


extern struct vmbus_connection vmbus_connection;

enum vmbus_message_handler_type {
	/* The related handler can sleep. */
	VMHT_BLOCKING = 0,

	/* The related handler must NOT sleep. */
	VMHT_NON_BLOCKING = 1,
};

struct vmbus_channel_message_table_entry {
	enum vmbus_channel_message_type message_type;
	enum vmbus_message_handler_type handler_type;
	void (*message_handler)(struct vmbus_channel_message_header *msg);
};

extern struct vmbus_channel_message_table_entry
	channel_message_table[CHANNELMSG_COUNT];

/* General vmbus interface */

struct hv_device *vmbus_device_create(const uuid_le *type,
				      const uuid_le *instance,
				      struct vmbus_channel *channel);

int vmbus_device_register(struct hv_device *child_device_obj);
void vmbus_device_unregister(struct hv_device *device_obj);

/* static void */
/* VmbusChildDeviceDestroy( */
/* struct hv_device *); */

struct vmbus_channel *relid2channel(u32 relid);

void vmbus_free_channels(void);

/* Connection interface */

int vmbus_connect(void);
void vmbus_disconnect(void);

int vmbus_post_msg(void *buffer, size_t buflen);

int vmbus_set_event(struct vmbus_channel *channel);

void vmbus_on_event(unsigned long data);

int hv_kvp_init(struct hv_util_service *);
void hv_kvp_deinit(void);
void hv_kvp_onchannelcallback(void *);

int hv_vss_init(struct hv_util_service *);
void hv_vss_deinit(void);
void hv_vss_onchannelcallback(void *);

int hv_fcopy_init(struct hv_util_service *);
void hv_fcopy_deinit(void);
void hv_fcopy_onchannelcallback(void *);
void vmbus_initiate_unload(void);

static inline void hv_poll_channel(struct vmbus_channel *channel,
				   void (*cb)(void *))
{
	if (!channel)
		return;

	if (channel->target_cpu != smp_processor_id())
		smp_call_function_single(channel->target_cpu,
					 cb, channel, true);
	else
		cb(channel);
}

enum hvutil_device_state {
	HVUTIL_DEVICE_INIT = 0,  /* driver is loaded, waiting for userspace */
	HVUTIL_READY,            /* userspace is registered */
	HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
	HVUTIL_USERSPACE_REQ,    /* request to userspace was sent */
	HVUTIL_USERSPACE_RECV,   /* reply from userspace was received */
	HVUTIL_DEVICE_DYING,     /* driver unload is in progress */
};

#endif /* _HYPERV_VMBUS_H */
OpenPOWER on IntegriCloud