[linux-2.6-block.git] / drivers / hv / hyperv_vmbus.h

/*
 *
 * 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>
#include <linux/interrupt.h>

/*
 * Timeout for services such as KVP and fcopy.
 */
#define HV_UTIL_TIMEOUT 30

/*
 * Timeout for guest-host handshake for services.
 */
#define HV_UTIL_NEGO_TIMEOUT 55

/* Define synthetic interrupt controller flag constants. */
#define HV_EVENT_FLAGS_COUNT		(256 * 8)
#define HV_EVENT_FLAGS_LONG_COUNT	(256 / sizeof(unsigned long))

/*
 * 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 the synthetic interrupt controller event flags format. */
union hv_synic_event_flags {
	unsigned long flags[HV_EVENT_FLAGS_LONG_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];
};

#define HV_HYPERCALL_PARAM_ALIGN	sizeof(u64)

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


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,
};

/*
 * Per cpu state for channel handling
 */
struct hv_per_cpu_context {
	void *synic_message_page;
	void *synic_event_page;
	/*
	 * buffer to post messages to the host.
	 */
	void *post_msg_page;

	/*
	 * Starting with win8, we can take channel interrupts on any CPU;
	 * we will manage the tasklet that handles events messages on a per CPU
	 * basis.
	 */
	struct tasklet_struct msg_dpc;

	/*
	 * To optimize the mapping of relid to channel, maintain
	 * per-cpu list of the channels based on their CPU affinity.
	 */
	struct list_head chan_list;
	struct clock_event_device *clk_evt;
};

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 *tsc_page;

	bool synic_initialized;

	struct hv_per_cpu_context __percpu *cpu_context;

	/*
	 * 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];

	/*
	 * To manage allocations in a NUMA node.
	 * Array indexed by numa node ID.
	 */
	struct cpumask *hv_numa_map;
};

extern struct hv_context hv_context;

/* Hv Interface */

extern int hv_init(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 int hv_synic_alloc(void);

extern void hv_synic_free(void);

extern int hv_synic_init(unsigned int cpu);

extern int hv_synic_cleanup(unsigned int cpu);

extern void hv_synic_clockevents_cleanup(void);

/* Interface */


int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
		       struct page *pages, u32 pagecnt);

void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);

int hv_ringbuffer_write(struct vmbus_channel *channel,
			const struct kvec *kv_list, u32 kv_count);

int hv_ringbuffer_read(struct vmbus_channel *channel,
		       void *buffer, u32 buflen, u32 *buffer_actual_len,
		       u64 *requestid, bool raw);

/*
 * 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;
	struct mutex channel_mutex;

	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;

static inline void vmbus_send_interrupt(u32 relid)
{
	sync_set_bit(relid, vmbus_connection.send_int_page);
}

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 const 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);

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, bool can_sleep);

void vmbus_on_event(unsigned long data);
void vmbus_on_msg_dpc(unsigned long data);

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

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

int hv_fcopy_init(struct hv_util_service *srv);
void hv_fcopy_deinit(void);
void hv_fcopy_onchannelcallback(void *context);
void vmbus_initiate_unload(bool crash);

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

	if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
		cb(channel);
		return;
	}
	smp_call_function_single(channel->target_cpu, cb, channel, true);
}

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 */
Commit	Line	Data
0f2a6619 S	1	/*
	2	*
	3	* Copyright (c) 2011, Microsoft Corporation.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	16	* Place - Suite 330, Boston, MA 02111-1307 USA.
	17	*
	18	* Authors:
	19	* Haiyang Zhang <haiyangz@microsoft.com>
	20	* Hank Janssen <hjanssen@microsoft.com>
	21	* K. Y. Srinivasan <kys@microsoft.com>
	22	*
	23	*/
	24
	25	#ifndef _HYPERV_VMBUS_H
	26	#define _HYPERV_VMBUS_H
	27
43c698b9 S	28	#include <linux/list.h>
	29	#include <asm/sync_bitops.h>
	30	#include <linux/atomic.h>
46a97191	31	#include <linux/hyperv.h>
37cdd991	32	#include <linux/interrupt.h>
43c698b9	33
c0b200cf S	34	/*
	35	* Timeout for services such as KVP and fcopy.
	36	*/
	37	#define HV_UTIL_TIMEOUT 30
	38
4dbfc2e6 VK	39	/*
	40	* Timeout for guest-host handshake for services.
	41	*/
d7edd31b	42	#define HV_UTIL_NEGO_TIMEOUT 55
4dbfc2e6	43
5c1bec61 SH	44	/* Define synthetic interrupt controller flag constants. */
	45	#define HV_EVENT_FLAGS_COUNT (256 * 8)
	46	#define HV_EVENT_FLAGS_LONG_COUNT (256 / sizeof(unsigned long))
afbdc4a9	47
4061ed9e S	48	/*
	49	* Timer configuration register.
	50	*/
	51	union hv_timer_config {
	52	u64 as_uint64;
	53	struct {
	54	u64 enable:1;
	55	u64 periodic:1;
	56	u64 lazy:1;
	57	u64 auto_enable:1;
	58	u64 reserved_z0:12;
	59	u64 sintx:4;
	60	u64 reserved_z1:44;
	61	};
	62	};
	63
afbdc4a9	64
afbdc4a9 S	65	/* Define the synthetic interrupt controller event flags format. */
afbdc4a9 S	66	union hv_synic_event_flags {
5c1bec61	67	unsigned long flags[HV_EVENT_FLAGS_LONG_COUNT];
afbdc4a9 S	68	};
afbdc4a9 S	69
afbdc4a9 S	70	/* Define SynIC control register. */
	71	union hv_synic_scontrol {
	72	u64 as_uint64;
	73	struct {
	74	u64 enable:1;
	75	u64 reserved:63;
	76	};
	77	};
	78
	79	/* Define synthetic interrupt source. */
	80	union hv_synic_sint {
	81	u64 as_uint64;
	82	struct {
	83	u64 vector:8;
	84	u64 reserved1:8;
	85	u64 masked:1;
	86	u64 auto_eoi:1;
	87	u64 reserved2:46;
	88	};
	89	};
	90
	91	/* Define the format of the SIMP register */
	92	union hv_synic_simp {
	93	u64 as_uint64;
	94	struct {
	95	u64 simp_enabled:1;
	96	u64 preserved:11;
	97	u64 base_simp_gpa:52;
	98	};
	99	};
	100
	101	/* Define the format of the SIEFP register */
	102	union hv_synic_siefp {
	103	u64 as_uint64;
	104	struct {
	105	u64 siefp_enabled:1;
	106	u64 preserved:11;
	107	u64 base_siefp_gpa:52;
	108	};
	109	};
	110
	111	/* Definitions for the monitored notification facility */
	112	union hv_monitor_trigger_group {
	113	u64 as_uint64;
	114	struct {
	115	u32 pending;
	116	u32 armed;
	117	};
	118	};
	119
	120	struct hv_monitor_parameter {
	121	union hv_connection_id connectionid;
	122	u16 flagnumber;
	123	u16 rsvdz;
	124	};
	125
	126	union hv_monitor_trigger_state {
	127	u32 asu32;
	128
	129	struct {
	130	u32 group_enable:4;
	131	u32 rsvdz:28;
	132	};
	133	};
134
135	/* struct hv_monitor_page Layout */
136	/* ------------------------------------------------------ */
137	/* \| 0 \| TriggerState (4 bytes) \| Rsvd1 (4 bytes) \| */
138	/* \| 8 \| TriggerGroup[0] \| */
139	/* \| 10 \| TriggerGroup[1] \| */
140	/* \| 18 \| TriggerGroup[2] \| */
141	/* \| 20 \| TriggerGroup[3] \| */
142	/* \| 28 \| Rsvd2[0] \| */
143	/* \| 30 \| Rsvd2[1] \| */
144	/* \| 38 \| Rsvd2[2] \| */
145	/* \| 40 \| NextCheckTime[0][0] \| NextCheckTime[0][1] \| */
146	/* \| ... \| */
147	/* \| 240 \| Latency[0][0..3] \| */
148	/* \| 340 \| Rsvz3[0] \| */
149	/* \| 440 \| Parameter[0][0] \| */
150	/* \| 448 \| Parameter[0][1] \| */
151	/* \| ... \| */
152	/* \| 840 \| Rsvd4[0] \| */
153	/* ------------------------------------------------------ */
154	struct hv_monitor_page {
155	union hv_monitor_trigger_state trigger_state;
156	u32 rsvdz1;
157
158	union hv_monitor_trigger_group trigger_group[4];
159	u64 rsvdz2[3];
160
161	s32 next_checktime[4][32];
162
163	u16 latency[4][32];
164	u64 rsvdz3[32];
165
166	struct hv_monitor_parameter parameter[4][32];
167
168	u8 rsvdz4[1984];
169	};
170
8e27a236 S	171	#define HV_HYPERCALL_PARAM_ALIGN sizeof(u64)
8e27a236 S	172
afbdc4a9 S	173	/* Definition of the hv_post_message hypercall input structure. */
	174	struct hv_input_post_message {
	175	union hv_connection_id connectionid;
	176	u32 reserved;
7797dcf6	177	u32 message_type;
afbdc4a9 S	178	u32 payload_size;
	179	u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
	180	};
	181
afbdc4a9	182
3645a917 S	183	enum {
	184	VMBUS_MESSAGE_CONNECTION_ID = 1,
	185	VMBUS_MESSAGE_PORT_ID = 1,
	186	VMBUS_EVENT_CONNECTION_ID = 2,
	187	VMBUS_EVENT_PORT_ID = 2,
	188	VMBUS_MONITOR_CONNECTION_ID = 3,
	189	VMBUS_MONITOR_PORT_ID = 3,
	190	VMBUS_MESSAGE_SINT = 2,
	191	};
	192
37cdd991 SH	193	/*
	194	* Per cpu state for channel handling
	195	*/
	196	struct hv_per_cpu_context {
	197	void *synic_message_page;
	198	void *synic_event_page;
	199	/*
	200	* buffer to post messages to the host.
	201	*/
	202	void *post_msg_page;
	203
	204	/*
	205	* Starting with win8, we can take channel interrupts on any CPU;
	206	* we will manage the tasklet that handles events messages on a per CPU
	207	* basis.
	208	*/
37cdd991 SH	209	struct tasklet_struct msg_dpc;
	210
	211	/*
	212	* To optimize the mapping of relid to channel, maintain
	213	* per-cpu list of the channels based on their CPU affinity.
	214	*/
	215	struct list_head chan_list;
	216	struct clock_event_device *clk_evt;
	217	};
	218
3645a917 S	219	struct hv_context {
3645a917 S	220	/* We only support running on top of Hyper-V
2a9d7de2 SH	221	* So at this point this really can only contain the Hyper-V ID
2a9d7de2 SH	222	*/
3645a917 S	223	u64 guestid;
3645a917 S	224
ca9357bd	225	void *tsc_page;
3645a917 S	226
	227	bool synic_initialized;
	228
37cdd991 SH	229	struct hv_per_cpu_context __percpu *cpu_context;
37cdd991 SH	230
917ea427 S	231	/*
	232	* Hypervisor's notion of virtual processor ID is different from
	233	* Linux' notion of CPU ID. This information can only be retrieved
	234	* in the context of the calling CPU. Setup a map for easy access
	235	* to this information:
	236	*
	237	* vp_index[a] is the Hyper-V's processor ID corresponding to
	238	* Linux cpuid 'a'.
	239	*/
	240	u32 vp_index[NR_CPUS];
37cdd991	241
9f01ec53 S	242	/*
	243	* To manage allocations in a NUMA node.
	244	* Array indexed by numa node ID.
	245	*/
	246	struct cpumask *hv_numa_map;
3645a917 S	247	};
	248
	249	extern struct hv_context hv_context;
	250
3645a917 S	251	/* Hv Interface */
	252
	253	extern int hv_init(void);
	254
415f0a02	255	extern int hv_post_message(union hv_connection_id connection_id,
3645a917 S	256	enum hv_message_type message_type,
	257	void *payload, size_t payload_size);
	258
2608fb65 JW	259	extern int hv_synic_alloc(void);
	260
	261	extern void hv_synic_free(void);
	262
76d36ab7	263	extern int hv_synic_init(unsigned int cpu);
3645a917	264
76d36ab7	265	extern int hv_synic_cleanup(unsigned int cpu);
3645a917	266
e086748c VK	267	extern void hv_synic_clockevents_cleanup(void);
e086748c VK	268
940655c1 S	269	/* Interface */
	270
	271
9988ce68 VK	272	int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
9988ce68 VK	273	struct page *pages, u32 pagecnt);
940655c1 S	274
	275	void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
	276
1f6ee4e7	277	int hv_ringbuffer_write(struct vmbus_channel *channel,
e4165a0f	278	const struct kvec *kv_list, u32 kv_count);
940655c1	279
3372592a	280	int hv_ringbuffer_read(struct vmbus_channel *channel,
940b68e2	281	void buffer, u32 buflen, u32 buffer_actual_len,
3372592a	282	u64 *requestid, bool raw);
940655c1	283
89b2ca47 S	284	/*
	285	* Maximum channels is determined by the size of the interrupt page
	286	* which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
	287	* and the other is receive endpoint interrupt
	288	*/
	289	#define MAX_NUM_CHANNELS ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
	290
	291	/* The value here must be in multiple of 32 */
	292	/* TODO: Need to make this configurable */
	293	#define MAX_NUM_CHANNELS_SUPPORTED 256
	294
	295
	296	enum vmbus_connect_state {
	297	DISCONNECTED,
	298	CONNECTING,
	299	CONNECTED,
	300	DISCONNECTING
	301	};
	302
	303	#define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
	304
	305	struct vmbus_connection {
	306	enum vmbus_connect_state conn_state;
	307
	308	atomic_t next_gpadl_handle;
	309
2db84eff	310	struct completion unload_event;
89b2ca47 S	311	/*
	312	* Represents channel interrupts. Each bit position represents a
	313	* channel. When a channel sends an interrupt via VMBUS, it finds its
	314	* bit in the sendInterruptPage, set it and calls Hv to generate a port
	315	* event. The other end receives the port event and parse the
	316	* recvInterruptPage to see which bit is set
	317	*/
	318	void *int_page;
	319	void *send_int_page;
	320	void *recv_int_page;
	321
	322	/*
	323	* 2 pages - 1st page for parent->child notification and 2nd
	324	* is child->parent notification
	325	*/
8681db44	326	struct hv_monitor_page *monitor_pages[2];
89b2ca47 S	327	struct list_head chn_msg_list;
	328	spinlock_t channelmsg_lock;
	329
	330	/* List of channels */
	331	struct list_head chn_list;
d6f591e3	332	struct mutex channel_mutex;
89b2ca47 S	333
	334	struct workqueue_struct *work_queue;
	335	};
	336
	337
	338	struct vmbus_msginfo {
	339	/* Bookkeeping stuff */
	340	struct list_head msglist_entry;
	341
	342	/* The message itself */
	343	unsigned char msg[0];
	344	};
	345
	346
	347	extern struct vmbus_connection vmbus_connection;
	348
5c1bec61 SH	349	static inline void vmbus_send_interrupt(u32 relid)
	350	{
	351	sync_set_bit(relid, vmbus_connection.send_int_page);
	352	}
	353
652594c7 DC	354	enum vmbus_message_handler_type {
	355	/* The related handler can sleep. */
	356	VMHT_BLOCKING = 0,
	357
	358	/* The related handler must NOT sleep. */
	359	VMHT_NON_BLOCKING = 1,
	360	};
	361
	362	struct vmbus_channel_message_table_entry {
	363	enum vmbus_channel_message_type message_type;
	364	enum vmbus_message_handler_type handler_type;
	365	void (message_handler)(struct vmbus_channel_message_header msg);
	366	};
	367
e6242fa0	368	extern const struct vmbus_channel_message_table_entry
652594c7 DC	369	channel_message_table[CHANNELMSG_COUNT];
652594c7 DC	370
0f70b669	371
89b2ca47 S	372	/* General vmbus interface */
89b2ca47 S	373
1b9d48f2	374	struct hv_device vmbus_device_create(const uuid_le type,
	375	const uuid_le *instance,
	376	struct vmbus_channel *channel);
89b2ca47	377
22794281	378	int vmbus_device_register(struct hv_device *child_device_obj);
696453ba	379	void vmbus_device_unregister(struct hv_device *device_obj);
89b2ca47	380
d43e2fe7	381	struct vmbus_channel *relid2channel(u32 relid);
89b2ca47	382
93e5bd06	383	void vmbus_free_channels(void);
89b2ca47 S	384
	385	/* Connection interface */
	386
	387	int vmbus_connect(void);
09a19628	388	void vmbus_disconnect(void);
89b2ca47	389
c0bb0392	390	int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
89b2ca47	391
89b2ca47	392	void vmbus_on_event(unsigned long data);
d81274aa	393	void vmbus_on_msg_dpc(unsigned long data);
89b2ca47	394
2a9d7de2	395	int hv_kvp_init(struct hv_util_service *srv);
3647a83d	396	void hv_kvp_deinit(void);
2a9d7de2	397	void hv_kvp_onchannelcallback(void *context);
3647a83d	398
2a9d7de2	399	int hv_vss_init(struct hv_util_service *srv);
3647a83d	400	void hv_vss_deinit(void);
2a9d7de2	401	void hv_vss_onchannelcallback(void *context);
3647a83d	402
2a9d7de2	403	int hv_fcopy_init(struct hv_util_service *srv);
01325476	404	void hv_fcopy_deinit(void);
2a9d7de2	405	void hv_fcopy_onchannelcallback(void *context);
75ff3a8a	406	void vmbus_initiate_unload(bool crash);
01325476	407
8efe78fd VK	408	static inline void hv_poll_channel(struct vmbus_channel *channel,
	409	void (cb)(void ))
	410	{
	411	if (!channel)
	412	return;
	413
1e052a16 S	414	if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
	415	cb(channel);
	416	return;
	417	}
3cace4a6	418	smp_call_function_single(channel->target_cpu, cb, channel, true);
8efe78fd	419	}
89b2ca47	420
636c88da VK	421	enum hvutil_device_state {
	422	HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */
	423	HVUTIL_READY, /* userspace is registered */
	424	HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
	425	HVUTIL_USERSPACE_REQ, /* request to userspace was sent */
	426	HVUTIL_USERSPACE_RECV, /* reply from userspace was received */
	427	HVUTIL_DEVICE_DYING, /* driver unload is in progress */
	428	};
	429
0f2a6619	430	#endif /* _HYPERV_VMBUS_H */