[deliverable/linux.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>

/*
 * 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 60

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

/* 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;
	};
};

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

/* 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];
};

/* 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];
};

/*
 * 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 messages on a per CPU
	 * basis.
	 */
	struct tasklet_struct *event_dpc[NR_CPUS];
	struct tasklet_struct *msg_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(bool crash);

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 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,
		       struct page *pages, u32 pagecnt);

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, bool lock,
		    enum hv_signal_policy policy);

int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info,
		       void *buffer, u32 buflen, u32 *buffer_actual_len,
		       u64 *requestid, bool *signal, bool raw);

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;
	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;

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];

/* Free the message slot and signal end-of-message if required */
static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
{
	/*
	 * On crash we're reading some other CPU's message page and we need
	 * to be careful: this other CPU may already had cleared the header
	 * and the host may already had delivered some other message there.
	 * In case we blindly write msg->header.message_type we're going
	 * to lose it. We can still lose a message of the same type but
	 * we count on the fact that there can only be one
	 * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages
	 * on crash.
	 */
	if (cmpxchg(&msg->header.message_type, old_msg_type,
		    HVMSG_NONE) != old_msg_type)
		return;

	/*
	 * Make sure the write to MessageType (ie set to
	 * HVMSG_NONE) happens before we read the
	 * MessagePending and EOMing. Otherwise, the EOMing
	 * will not deliver any more messages since there is
	 * no empty slot
	 */
	mb();

	if (msg->header.message_flags.msg_pending) {
		/*
		 * This will cause message queue rescan to
		 * possibly deliver another msg from the
		 * hypervisor
		 */
		wrmsrl(HV_X64_MSR_EOM, 0);
	}
}

/* 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);

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

static inline void hv_poll_channel(struct vmbus_channel *channel,
				   void (*cb)(void *))
{
	if (!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>
43c698b9	32
c0b200cf S	33	/*
	34	* Timeout for services such as KVP and fcopy.
	35	*/
	36	#define HV_UTIL_TIMEOUT 30
	37
4dbfc2e6 VK	38	/*
	39	* Timeout for guest-host handshake for services.
	40	*/
	41	#define HV_UTIL_NEGO_TIMEOUT 60
	42
afbdc4a9 S	43	/*
	44	* The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
	45	* is set by CPUID(HVCPUID_VERSION_FEATURES).
	46	*/
	47	enum hv_cpuid_function {
	48	HVCPUID_VERSION_FEATURES = 0x00000001,
	49	HVCPUID_VENDOR_MAXFUNCTION = 0x40000000,
	50	HVCPUID_INTERFACE = 0x40000001,
	51
	52	/*
	53	* The remaining functions depend on the value of
	54	* HVCPUID_INTERFACE
	55	*/
	56	HVCPUID_VERSION = 0x40000002,
	57	HVCPUID_FEATURES = 0x40000003,
	58	HVCPUID_ENLIGHTENMENT_INFO = 0x40000004,
	59	HVCPUID_IMPLEMENTATION_LIMITS = 0x40000005,
	60	};
	61
96c1d058 NM	62	#define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE 0x400
	63
	64	#define HV_X64_MSR_CRASH_P0 0x40000100
	65	#define HV_X64_MSR_CRASH_P1 0x40000101
	66	#define HV_X64_MSR_CRASH_P2 0x40000102
	67	#define HV_X64_MSR_CRASH_P3 0x40000103
	68	#define HV_X64_MSR_CRASH_P4 0x40000104
	69	#define HV_X64_MSR_CRASH_CTL 0x40000105
	70
5ef5b692	71	#define HV_CRASH_CTL_CRASH_NOTIFY (1ULL << 63)
96c1d058	72
afbdc4a9 S	73	/* Define version of the synthetic interrupt controller. */
	74	#define HV_SYNIC_VERSION (1)
	75
afbdc4a9 S	76	#define HV_ANY_VP (0xFFFFFFFF)
	77
	78	/* Define synthetic interrupt controller flag constants. */
	79	#define HV_EVENT_FLAGS_COUNT (256 * 8)
	80	#define HV_EVENT_FLAGS_BYTE_COUNT (256)
	81	#define HV_EVENT_FLAGS_DWORD_COUNT (256 / sizeof(u32))
	82
afbdc4a9 S	83	/* Define invalid partition identifier. */
	84	#define HV_PARTITION_ID_INVALID ((u64)0x0)
	85
afbdc4a9 S	86	/* Define port type. */
	87	enum hv_port_type {
	88	HVPORT_MSG = 1,
	89	HVPORT_EVENT = 2,
	90	HVPORT_MONITOR = 3
	91	};
	92
	93	/* Define port information structure. */
	94	struct hv_port_info {
	95	enum hv_port_type port_type;
	96	u32 padding;
	97	union {
	98	struct {
	99	u32 target_sint;
	100	u32 target_vp;
	101	u64 rsvdz;
	102	} message_port_info;
	103	struct {
	104	u32 target_sint;
	105	u32 target_vp;
e26009aa	106	u16 base_flag_number;
afbdc4a9 S	107	u16 flag_count;
	108	u32 rsvdz;
	109	} event_port_info;
	110	struct {
	111	u64 monitor_address;
	112	u64 rsvdz;
	113	} monitor_port_info;
	114	};
	115	};
	116
	117	struct hv_connection_info {
	118	enum hv_port_type port_type;
	119	u32 padding;
	120	union {
	121	struct {
	122	u64 rsvdz;
	123	} message_connection_info;
	124	struct {
	125	u64 rsvdz;
	126	} event_connection_info;
	127	struct {
	128	u64 monitor_address;
	129	} monitor_connection_info;
	130	};
	131	};
	132
4061ed9e S	133	/*
	134	* Timer configuration register.
	135	*/
	136	union hv_timer_config {
	137	u64 as_uint64;
	138	struct {
	139	u64 enable:1;
	140	u64 periodic:1;
	141	u64 lazy:1;
	142	u64 auto_enable:1;
	143	u64 reserved_z0:12;
	144	u64 sintx:4;
	145	u64 reserved_z1:44;
	146	};
	147	};
	148
afbdc4a9 S	149	/* Define the number of message buffers associated with each port. */
	150	#define HV_PORT_MESSAGE_BUFFER_COUNT (16)
	151
afbdc4a9 S	152	/* Define the synthetic interrupt controller event flags format. */
	153	union hv_synic_event_flags {
	154	u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
	155	u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
	156	};
	157
	158	/* Define the synthetic interrupt flags page layout. */
	159	struct hv_synic_event_flags_page {
	160	union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
	161	};
	162
	163	/* Define SynIC control register. */
	164	union hv_synic_scontrol {
	165	u64 as_uint64;
	166	struct {
	167	u64 enable:1;
	168	u64 reserved:63;
	169	};
	170	};
	171
	172	/* Define synthetic interrupt source. */
	173	union hv_synic_sint {
	174	u64 as_uint64;
	175	struct {
	176	u64 vector:8;
	177	u64 reserved1:8;
	178	u64 masked:1;
	179	u64 auto_eoi:1;
	180	u64 reserved2:46;
	181	};
	182	};
	183
	184	/* Define the format of the SIMP register */
	185	union hv_synic_simp {
	186	u64 as_uint64;
	187	struct {
	188	u64 simp_enabled:1;
	189	u64 preserved:11;
	190	u64 base_simp_gpa:52;
	191	};
	192	};
	193
	194	/* Define the format of the SIEFP register */
	195	union hv_synic_siefp {
	196	u64 as_uint64;
	197	struct {
	198	u64 siefp_enabled:1;
	199	u64 preserved:11;
	200	u64 base_siefp_gpa:52;
	201	};
	202	};
	203
	204	/* Definitions for the monitored notification facility */
	205	union hv_monitor_trigger_group {
	206	u64 as_uint64;
	207	struct {
	208	u32 pending;
	209	u32 armed;
	210	};
	211	};
	212
	213	struct hv_monitor_parameter {
	214	union hv_connection_id connectionid;
	215	u16 flagnumber;
216	u16 rsvdz;
217	};
218
219	union hv_monitor_trigger_state {
220	u32 asu32;
221
222	struct {
223	u32 group_enable:4;
224	u32 rsvdz:28;
225	};
226	};
227
228	/* struct hv_monitor_page Layout */
229	/* ------------------------------------------------------ */
230	/* \| 0 \| TriggerState (4 bytes) \| Rsvd1 (4 bytes) \| */
231	/* \| 8 \| TriggerGroup[0] \| */
232	/* \| 10 \| TriggerGroup[1] \| */
233	/* \| 18 \| TriggerGroup[2] \| */
234	/* \| 20 \| TriggerGroup[3] \| */
235	/* \| 28 \| Rsvd2[0] \| */
236	/* \| 30 \| Rsvd2[1] \| */
237	/* \| 38 \| Rsvd2[2] \| */
238	/* \| 40 \| NextCheckTime[0][0] \| NextCheckTime[0][1] \| */
239	/* \| ... \| */
240	/* \| 240 \| Latency[0][0..3] \| */
241	/* \| 340 \| Rsvz3[0] \| */
242	/* \| 440 \| Parameter[0][0] \| */
243	/* \| 448 \| Parameter[0][1] \| */
244	/* \| ... \| */
245	/* \| 840 \| Rsvd4[0] \| */
246	/* ------------------------------------------------------ */
247	struct hv_monitor_page {
248	union hv_monitor_trigger_state trigger_state;
249	u32 rsvdz1;
250
251	union hv_monitor_trigger_group trigger_group[4];
252	u64 rsvdz2[3];
253
254	s32 next_checktime[4][32];
255
256	u16 latency[4][32];
257	u64 rsvdz3[32];
258
259	struct hv_monitor_parameter parameter[4][32];
260
261	u8 rsvdz4[1984];
262	};
263
afbdc4a9 S	264	/* Definition of the hv_post_message hypercall input structure. */
	265	struct hv_input_post_message {
	266	union hv_connection_id connectionid;
	267	u32 reserved;
7797dcf6	268	u32 message_type;
afbdc4a9 S	269	u32 payload_size;
	270	u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
	271	};
	272
afbdc4a9 S	273	/*
	274	* Versioning definitions used for guests reporting themselves to the
	275	* hypervisor, and visa versa.
	276	*/
	277
	278	/* Version info reported by guest OS's */
	279	enum hv_guest_os_vendor {
	280	HVGUESTOS_VENDOR_MICROSOFT = 0x0001
	281	};
	282
	283	enum hv_guest_os_microsoft_ids {
	284	HVGUESTOS_MICROSOFT_UNDEFINED = 0x00,
	285	HVGUESTOS_MICROSOFT_MSDOS = 0x01,
	286	HVGUESTOS_MICROSOFT_WINDOWS3X = 0x02,
	287	HVGUESTOS_MICROSOFT_WINDOWS9X = 0x03,
	288	HVGUESTOS_MICROSOFT_WINDOWSNT = 0x04,
	289	HVGUESTOS_MICROSOFT_WINDOWSCE = 0x05
	290	};
	291
	292	/*
	293	* Declare the MSR used to identify the guest OS.
	294	*/
	295	#define HV_X64_MSR_GUEST_OS_ID 0x40000000
	296
	297	union hv_x64_msr_guest_os_id_contents {
	298	u64 as_uint64;
	299	struct {
	300	u64 build_number:16;
	301	u64 service_version:8; /* Service Pack, etc. */
	302	u64 minor_version:8;
	303	u64 major_version:8;
	304	u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */
	305	u64 vendor_id:16; /* enum hv_guest_os_vendor */
	306	};
	307	};
	308
	309	/*
	310	* Declare the MSR used to setup pages used to communicate with the hypervisor.
	311	*/
	312	#define HV_X64_MSR_HYPERCALL 0x40000001
	313
	314	union hv_x64_msr_hypercall_contents {
	315	u64 as_uint64;
	316	struct {
	317	u64 enable:1;
	318	u64 reserved:11;
	319	u64 guest_physical_address:52;
	320	};
	321	};
	322
3645a917 S	323
	324	enum {
	325	VMBUS_MESSAGE_CONNECTION_ID = 1,
	326	VMBUS_MESSAGE_PORT_ID = 1,
	327	VMBUS_EVENT_CONNECTION_ID = 2,
	328	VMBUS_EVENT_PORT_ID = 2,
	329	VMBUS_MONITOR_CONNECTION_ID = 3,
	330	VMBUS_MONITOR_PORT_ID = 3,
	331	VMBUS_MESSAGE_SINT = 2,
	332	};
	333
	334	/* #defines */
	335
	336	#define HV_PRESENT_BIT 0x80000000
	337
83ba0c4f S	338	/*
	339	* The guest OS needs to register the guest ID with the hypervisor.
	340	* The guest ID is a 64 bit entity and the structure of this ID is
	341	* specified in the Hyper-V specification:
	342	*
	343	* http://msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
	344	*
	345	* While the current guideline does not specify how Linux guest ID(s)
	346	* need to be generated, our plan is to publish the guidelines for
	347	* Linux and other guest operating systems that currently are hosted
	348	* on Hyper-V. The implementation here conforms to this yet
	349	* unpublished guidelines.
	350	*
	351	*
	352	* Bit(s)
	353	* 63 - Indicates if the OS is Open Source or not; 1 is Open Source
	354	* 62:56 - Os Type; Linux is 0x100
	355	* 55:48 - Distro specific identification
	356	* 47:16 - Linux kernel version number
	357	* 15:0 - Distro specific identification
	358	*
	359	*
	360	*/
	361
	362	#define HV_LINUX_VENDOR_ID 0x8100
	363
	364	/*
	365	* Generate the guest ID based on the guideline described above.
	366	*/
	367
	368	static inline __u64 generate_guest_id(__u8 d_info1, __u32 kernel_version,
	369	__u16 d_info2)
	370	{
	371	__u64 guest_id = 0;
	372
	373	guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
	374	guest_id \|= (((__u64)(d_info1)) << 48);
	375	guest_id \|= (((__u64)(kernel_version)) << 16);
	376	guest_id \|= ((__u64)(d_info2));
	377
	378	return guest_id;
	379	}
	380
3645a917 S	381
	382	#define HV_CPU_POWER_MANAGEMENT (1 << 0)
	383	#define HV_RECOMMENDATIONS_MAX 4
	384
	385	#define HV_X64_MAX 5
	386	#define HV_CAPS_MAX 8
	387
	388
	389	#define HV_HYPERCALL_PARAM_ALIGN sizeof(u64)
	390
	391
	392	/* Service definitions */
	393
	394	#define HV_SERVICE_PARENT_PORT (0)
	395	#define HV_SERVICE_PARENT_CONNECTION (0)
	396
	397	#define HV_SERVICE_CONNECT_RESPONSE_SUCCESS (0)
	398	#define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER (1)
	399	#define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE (2)
	400	#define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3)
	401
	402	#define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID (1)
	403	#define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID (2)
	404	#define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID (3)
	405	#define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID (4)
	406	#define HV_SERVICE_MAX_MESSAGE_ID (4)
	407
	408	#define HV_SERVICE_PROTOCOL_VERSION (0x0010)
	409	#define HV_CONNECT_PAYLOAD_BYTE_COUNT 64
	410
	411	/* #define VMBUS_REVISION_NUMBER 6 */
	412
	413	/* Our local vmbus's port and connection id. Anything >0 is fine */
	414	/* #define VMBUS_PORT_ID 11 */
	415
	416	/* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
358d2ee2 S	417	static const uuid_le VMBUS_SERVICE_ID = {
358d2ee2 S	418	.b = {
3645a917 S	419	0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
	420	0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
	421	},
	422	};
	423
3645a917 S	424
3645a917 S	425
3645a917 S	426	struct hv_context {
	427	/* We only support running on top of Hyper-V
	428	* So at this point this really can only contain the Hyper-V ID
	429	*/
	430	u64 guestid;
	431
	432	void *hypercall_page;
ca9357bd	433	void *tsc_page;
3645a917 S	434
	435	bool synic_initialized;
	436
14c1bf8a S	437	void *synic_message_page[NR_CPUS];
14c1bf8a S	438	void *synic_event_page[NR_CPUS];
917ea427 S	439	/*
	440	* Hypervisor's notion of virtual processor ID is different from
	441	* Linux' notion of CPU ID. This information can only be retrieved
	442	* in the context of the calling CPU. Setup a map for easy access
	443	* to this information:
	444	*
	445	* vp_index[a] is the Hyper-V's processor ID corresponding to
	446	* Linux cpuid 'a'.
	447	*/
	448	u32 vp_index[NR_CPUS];
db11f12a S	449	/*
db11f12a S	450	* Starting with win8, we can take channel interrupts on any CPU;
d81274aa	451	* we will manage the tasklet that handles events messages on a per CPU
db11f12a S	452	* basis.
	453	*/
	454	struct tasklet_struct *event_dpc[NR_CPUS];
d81274aa	455	struct tasklet_struct *msg_dpc[NR_CPUS];
3a28fa35 S	456	/*
	457	* To optimize the mapping of relid to channel, maintain
	458	* per-cpu list of the channels based on their CPU affinity.
	459	*/
	460	struct list_head percpu_list[NR_CPUS];
b29ef354 S	461	/*
	462	* buffer to post messages to the host.
	463	*/
	464	void *post_msg_page[NR_CPUS];
4061ed9e S	465	/*
	466	* Support PV clockevent device.
	467	*/
	468	struct clock_event_device *clk_evt[NR_CPUS];
9f01ec53 S	469	/*
	470	* To manage allocations in a NUMA node.
	471	* Array indexed by numa node ID.
	472	*/
	473	struct cpumask *hv_numa_map;
3645a917 S	474	};
	475
	476	extern struct hv_context hv_context;
	477
ca9357bd S	478	struct ms_hyperv_tsc_page {
	479	volatile u32 tsc_sequence;
	480	u32 reserved1;
	481	volatile u64 tsc_scale;
	482	volatile s64 tsc_offset;
	483	u64 reserved2[509];
	484	};
	485
1fdde16d GKH	486	struct hv_ring_buffer_debug_info {
	487	u32 current_interrupt_mask;
	488	u32 current_read_index;
	489	u32 current_write_index;
	490	u32 bytes_avail_toread;
	491	u32 bytes_avail_towrite;
	492	};
3645a917 S	493
	494	/* Hv Interface */
	495
	496	extern int hv_init(void);
	497
a9f61ca7	498	extern void hv_cleanup(bool crash);
3645a917	499
415f0a02	500	extern int hv_post_message(union hv_connection_id connection_id,
3645a917 S	501	enum hv_message_type message_type,
	502	void *payload, size_t payload_size);
	503
2608fb65 JW	504	extern int hv_synic_alloc(void);
	505
	506	extern void hv_synic_free(void);
	507
3645a917 S	508	extern void hv_synic_init(void *irqarg);
	509
	510	extern void hv_synic_cleanup(void *arg);
	511
e086748c VK	512	extern void hv_synic_clockevents_cleanup(void);
e086748c VK	513
5fbebb2d S	514	/*
	515	* Host version information.
	516	*/
	517	extern unsigned int host_info_eax;
	518	extern unsigned int host_info_ebx;
	519	extern unsigned int host_info_ecx;
	520	extern unsigned int host_info_edx;
940655c1 S	521
	522	/* Interface */
	523
	524
9988ce68 VK	525	int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
9988ce68 VK	526	struct page *pages, u32 pagecnt);
940655c1 S	527
	528	void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
	529
	530	int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
011a7c3c	531	struct kvec *kv_list,
ccef9bcc S	532	u32 kv_count, bool *signal, bool lock,
ccef9bcc S	533	enum hv_signal_policy policy);
940655c1	534
940b68e2 VK	535	int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info,
	536	void buffer, u32 buflen, u32 buffer_actual_len,
	537	u64 requestid, bool signal, bool raw);
940655c1	538
940655c1 S	539	void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
	540	struct hv_ring_buffer_debug_info *debug_info);
	541
6fdf3b21 S	542	void hv_begin_read(struct hv_ring_buffer_info *rbi);
	543
	544	u32 hv_end_read(struct hv_ring_buffer_info *rbi);
	545
89b2ca47 S	546	/*
	547	* Maximum channels is determined by the size of the interrupt page
	548	* which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
	549	* and the other is receive endpoint interrupt
	550	*/
	551	#define MAX_NUM_CHANNELS ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
	552
	553	/* The value here must be in multiple of 32 */
	554	/* TODO: Need to make this configurable */
	555	#define MAX_NUM_CHANNELS_SUPPORTED 256
	556
	557
	558	enum vmbus_connect_state {
	559	DISCONNECTED,
	560	CONNECTING,
	561	CONNECTED,
	562	DISCONNECTING
	563	};
	564
	565	#define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
	566
	567	struct vmbus_connection {
	568	enum vmbus_connect_state conn_state;
	569
	570	atomic_t next_gpadl_handle;
	571
2db84eff	572	struct completion unload_event;
89b2ca47 S	573	/*
	574	* Represents channel interrupts. Each bit position represents a
	575	* channel. When a channel sends an interrupt via VMBUS, it finds its
	576	* bit in the sendInterruptPage, set it and calls Hv to generate a port
	577	* event. The other end receives the port event and parse the
	578	* recvInterruptPage to see which bit is set
	579	*/
	580	void *int_page;
	581	void *send_int_page;
	582	void *recv_int_page;
	583
	584	/*
	585	* 2 pages - 1st page for parent->child notification and 2nd
	586	* is child->parent notification
	587	*/
8681db44	588	struct hv_monitor_page *monitor_pages[2];
89b2ca47 S	589	struct list_head chn_msg_list;
	590	spinlock_t channelmsg_lock;
	591
	592	/* List of channels */
	593	struct list_head chn_list;
d6f591e3	594	struct mutex channel_mutex;
89b2ca47 S	595
	596	struct workqueue_struct *work_queue;
	597	};
	598
	599
	600	struct vmbus_msginfo {
	601	/* Bookkeeping stuff */
	602	struct list_head msglist_entry;
	603
	604	/* The message itself */
	605	unsigned char msg[0];
	606	};
	607
	608
	609	extern struct vmbus_connection vmbus_connection;
	610
652594c7 DC	611	enum vmbus_message_handler_type {
	612	/* The related handler can sleep. */
	613	VMHT_BLOCKING = 0,
	614
	615	/* The related handler must NOT sleep. */
	616	VMHT_NON_BLOCKING = 1,
	617	};
	618
	619	struct vmbus_channel_message_table_entry {
	620	enum vmbus_channel_message_type message_type;
	621	enum vmbus_message_handler_type handler_type;
	622	void (message_handler)(struct vmbus_channel_message_header msg);
	623	};
	624
	625	extern struct vmbus_channel_message_table_entry
	626	channel_message_table[CHANNELMSG_COUNT];
	627
0f70b669	628	/* Free the message slot and signal end-of-message if required */
cd95aad5	629	static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
0f70b669	630	{
cd95aad5 VK	631	/*
	632	* On crash we're reading some other CPU's message page and we need
	633	* to be careful: this other CPU may already had cleared the header
	634	* and the host may already had delivered some other message there.
	635	* In case we blindly write msg->header.message_type we're going
	636	* to lose it. We can still lose a message of the same type but
	637	* we count on the fact that there can only be one
	638	* CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages
	639	* on crash.
	640	*/
	641	if (cmpxchg(&msg->header.message_type, old_msg_type,
	642	HVMSG_NONE) != old_msg_type)
	643	return;
0f70b669 VK	644
	645	/*
	646	* Make sure the write to MessageType (ie set to
	647	* HVMSG_NONE) happens before we read the
	648	* MessagePending and EOMing. Otherwise, the EOMing
	649	* will not deliver any more messages since there is
	650	* no empty slot
	651	*/
	652	mb();
	653
	654	if (msg->header.message_flags.msg_pending) {
	655	/*
	656	* This will cause message queue rescan to
	657	* possibly deliver another msg from the
	658	* hypervisor
	659	*/
	660	wrmsrl(HV_X64_MSR_EOM, 0);
	661	}
	662	}
	663
89b2ca47 S	664	/* General vmbus interface */
89b2ca47 S	665
1b9d48f2	666	struct hv_device vmbus_device_create(const uuid_le type,
	667	const uuid_le *instance,
	668	struct vmbus_channel *channel);
89b2ca47	669
22794281	670	int vmbus_device_register(struct hv_device *child_device_obj);
696453ba	671	void vmbus_device_unregister(struct hv_device *device_obj);
89b2ca47 S	672
	673	/* static void */
	674	/* VmbusChildDeviceDestroy( */
	675	/* struct hv_device ); /
	676
d43e2fe7	677	struct vmbus_channel *relid2channel(u32 relid);
89b2ca47	678
93e5bd06	679	void vmbus_free_channels(void);
89b2ca47 S	680
	681	/* Connection interface */
	682
	683	int vmbus_connect(void);
09a19628	684	void vmbus_disconnect(void);
89b2ca47	685
89b2ca47 S	686	int vmbus_post_msg(void *buffer, size_t buflen);
89b2ca47 S	687
89b2ca47	688	void vmbus_on_event(unsigned long data);
d81274aa	689	void vmbus_on_msg_dpc(unsigned long data);
89b2ca47	690
3647a83d VK	691	int hv_kvp_init(struct hv_util_service *);
	692	void hv_kvp_deinit(void);
	693	void hv_kvp_onchannelcallback(void *);
	694
	695	int hv_vss_init(struct hv_util_service *);
	696	void hv_vss_deinit(void);
	697	void hv_vss_onchannelcallback(void *);
	698
01325476 S	699	int hv_fcopy_init(struct hv_util_service *);
	700	void hv_fcopy_deinit(void);
	701	void hv_fcopy_onchannelcallback(void *);
75ff3a8a	702	void vmbus_initiate_unload(bool crash);
01325476	703
8efe78fd VK	704	static inline void hv_poll_channel(struct vmbus_channel *channel,
	705	void (cb)(void ))
	706	{
	707	if (!channel)
	708	return;
	709
3cace4a6	710	smp_call_function_single(channel->target_cpu, cb, channel, true);
8efe78fd	711	}
89b2ca47	712
636c88da VK	713	enum hvutil_device_state {
	714	HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */
	715	HVUTIL_READY, /* userspace is registered */
	716	HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
	717	HVUTIL_USERSPACE_REQ, /* request to userspace was sent */
	718	HVUTIL_USERSPACE_RECV, /* reply from userspace was received */
	719	HVUTIL_DEVICE_DYING, /* driver unload is in progress */
	720	};
	721
0f2a6619	722	#endif /* _HYPERV_VMBUS_H */