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

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *
 * Copyright (c) 2011, Microsoft Corporation.
 *
 * 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 <asm/hyperv-tlfs.h>
#include <linux/atomic.h>
#include <linux/hyperv.h>
#include <linux/interrupt.h>

#include "hv_trace.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


/* 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_CONNECTION_ID_4	= 4,
	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;
};

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;

	struct hv_per_cpu_context __percpu *cpu_context;

	/*
	 * 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 void hv_synic_enable_regs(unsigned int cpu);
extern int hv_synic_init(unsigned int cpu);

extern void hv_synic_disable_regs(unsigned int cpu);
extern int hv_synic_cleanup(unsigned int cpu);

/* Interface */

void hv_ringbuffer_pre_init(struct vmbus_channel *channel);

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,
			u64 requestid);

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

/*
 * The Maximum number of channels (16384) is determined by the size of the
 * interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to
 * send endpoint interrupts, and the other is to receive endpoint interrupts.
 */
#define MAX_NUM_CHANNELS	((HV_HYP_PAGE_SIZE >> 1) << 3)

/* The value here must be in multiple of 32 */
#define MAX_NUM_CHANNELS_SUPPORTED	256

#define MAX_CHANNEL_RELIDS					\
	max(MAX_NUM_CHANNELS_SUPPORTED, HV_EVENT_FLAGS_COUNT)

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

#define MAX_SIZE_CHANNEL_MESSAGE	HV_MESSAGE_PAYLOAD_BYTE_COUNT

/*
 * The CPU that Hyper-V will interrupt for VMBUS messages, such as
 * CHANNELMSG_OFFERCHANNEL and CHANNELMSG_RESCIND_CHANNELOFFER.
 */
#define VMBUS_CONNECT_CPU	0

struct vmbus_connection {
	u32 msg_conn_id;

	atomic_t offer_in_progress;

	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;

	/* Array of channels */
	struct vmbus_channel **channels;

	/*
	 * An offer message is handled first on the work_queue, and then
	 * is further handled on handle_primary_chan_wq or
	 * handle_sub_chan_wq.
	 */
	struct workqueue_struct *work_queue;
	struct workqueue_struct *handle_primary_chan_wq;
	struct workqueue_struct *handle_sub_chan_wq;

	/*
	 * The number of sub-channels and hv_sock channels that should be
	 * cleaned up upon suspend: sub-channels will be re-created upon
	 * resume, and hv_sock channels should not survive suspend.
	 */
	atomic_t nr_chan_close_on_suspend;
	/*
	 * vmbus_bus_suspend() waits for "nr_chan_close_on_suspend" to
	 * drop to zero.
	 */
	struct completion ready_for_suspend_event;

	/*
	 * The number of primary channels that should be "fixed up"
	 * upon resume: these channels are re-offered upon resume, and some
	 * fields of the channel offers (i.e. child_relid and connection_id)
	 * can change, so the old offermsg must be fixed up, before the resume
	 * callbacks of the VSC drivers start to further touch the channels.
	 */
	atomic_t nr_chan_fixup_on_resume;
	/*
	 * vmbus_bus_resume() waits for "nr_chan_fixup_on_resume" to
	 * drop to zero.
	 */
	struct completion ready_for_resume_event;
};


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

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


extern struct vmbus_connection vmbus_connection;

int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version);

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);
	u32 min_payload_len;
};

extern const struct vmbus_channel_message_table_entry
	channel_message_table[CHANNELMSG_COUNT];


/* General vmbus interface */

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

int vmbus_device_register(struct hv_device *child_device_obj);
void vmbus_device_unregister(struct hv_device *device_obj);
int vmbus_add_channel_kobj(struct hv_device *device_obj,
			   struct vmbus_channel *channel);

void vmbus_remove_channel_attr_group(struct vmbus_channel *channel);

void vmbus_channel_map_relid(struct vmbus_channel *channel);
void vmbus_channel_unmap_relid(struct vmbus_channel *channel);

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);
int hv_kvp_pre_suspend(void);
int hv_kvp_pre_resume(void);
void hv_kvp_onchannelcallback(void *context);

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

int hv_fcopy_init(struct hv_util_service *srv);
void hv_fcopy_deinit(void);
int hv_fcopy_pre_suspend(void);
int hv_fcopy_pre_resume(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;
	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 */
};

enum delay {
	INTERRUPT_DELAY = 0,
	MESSAGE_DELAY   = 1,
};

extern const struct vmbus_device vmbus_devs[];

static inline bool hv_is_perf_channel(struct vmbus_channel *channel)
{
	return vmbus_devs[channel->device_id].perf_device;
}

static inline bool hv_is_alloced_cpu(unsigned int cpu)
{
	struct vmbus_channel *channel, *sc;

	lockdep_assert_held(&vmbus_connection.channel_mutex);
	/*
	 * List additions/deletions as well as updates of the target CPUs are
	 * protected by channel_mutex.
	 */
	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
		if (!hv_is_perf_channel(channel))
			continue;
		if (channel->target_cpu == cpu)
			return true;
		list_for_each_entry(sc, &channel->sc_list, sc_list) {
			if (sc->target_cpu == cpu)
				return true;
		}
	}
	return false;
}

static inline void hv_set_alloced_cpu(unsigned int cpu)
{
	cpumask_set_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
}

static inline void hv_clear_alloced_cpu(unsigned int cpu)
{
	if (hv_is_alloced_cpu(cpu))
		return;
	cpumask_clear_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
}

static inline void hv_update_alloced_cpus(unsigned int old_cpu,
					  unsigned int new_cpu)
{
	hv_set_alloced_cpu(new_cpu);
	hv_clear_alloced_cpu(old_cpu);
}

#ifdef CONFIG_HYPERV_TESTING

int hv_debug_add_dev_dir(struct hv_device *dev);
void hv_debug_rm_dev_dir(struct hv_device *dev);
void hv_debug_rm_all_dir(void);
int hv_debug_init(void);
void hv_debug_delay_test(struct vmbus_channel *channel, enum delay delay_type);

#else /* CONFIG_HYPERV_TESTING */

static inline void hv_debug_rm_dev_dir(struct hv_device *dev) {};
static inline void hv_debug_rm_all_dir(void) {};
static inline void hv_debug_delay_test(struct vmbus_channel *channel,
				       enum delay delay_type) {};
static inline int hv_debug_init(void)
{
	return -1;
}

static inline int hv_debug_add_dev_dir(struct hv_device *dev)
{
	return -1;
}

#endif /* CONFIG_HYPERV_TESTING */

#endif /* _HYPERV_VMBUS_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0-only */
	2	/*
	3	*
	4	* Copyright (c) 2011, Microsoft Corporation.
	5	*
	6	* Authors:
	7	* Haiyang Zhang <haiyangz@microsoft.com>
	8	* Hank Janssen <hjanssen@microsoft.com>
	9	* K. Y. Srinivasan <kys@microsoft.com>
	10	*/
	11
	12	#ifndef _HYPERV_VMBUS_H
	13	#define _HYPERV_VMBUS_H
	14
	15	#include <linux/list.h>
	16	#include <asm/sync_bitops.h>
	17	#include <asm/hyperv-tlfs.h>
	18	#include <linux/atomic.h>
	19	#include <linux/hyperv.h>
	20	#include <linux/interrupt.h>
	21
	22	#include "hv_trace.h"
	23
	24	/*
	25	* Timeout for services such as KVP and fcopy.
	26	*/
	27	#define HV_UTIL_TIMEOUT 30
	28
	29	/*
	30	* Timeout for guest-host handshake for services.
	31	*/
	32	#define HV_UTIL_NEGO_TIMEOUT 55
	33
	34
	35	/* Definitions for the monitored notification facility */
	36	union hv_monitor_trigger_group {
	37	u64 as_uint64;
	38	struct {
	39	u32 pending;
	40	u32 armed;
	41	};
	42	};
	43
	44	struct hv_monitor_parameter {
	45	union hv_connection_id connectionid;
	46	u16 flagnumber;
	47	u16 rsvdz;
	48	};
	49
	50	union hv_monitor_trigger_state {
	51	u32 asu32;
	52
	53	struct {
	54	u32 group_enable:4;
	55	u32 rsvdz:28;
	56	};
	57	};
	58
	59	/* struct hv_monitor_page Layout */
	60	/* ------------------------------------------------------ */
	61	/* \| 0 \| TriggerState (4 bytes) \| Rsvd1 (4 bytes) \| */
	62	/* \| 8 \| TriggerGroup[0] \| */
	63	/* \| 10 \| TriggerGroup[1] \| */
	64	/* \| 18 \| TriggerGroup[2] \| */
	65	/* \| 20 \| TriggerGroup[3] \| */
	66	/* \| 28 \| Rsvd2[0] \| */
	67	/* \| 30 \| Rsvd2[1] \| */
	68	/* \| 38 \| Rsvd2[2] \| */
	69	/* \| 40 \| NextCheckTime[0][0] \| NextCheckTime[0][1] \| */
	70	/* \| ... \| */
	71	/* \| 240 \| Latency[0][0..3] \| */
	72	/* \| 340 \| Rsvz3[0] \| */
	73	/* \| 440 \| Parameter[0][0] \| */
	74	/* \| 448 \| Parameter[0][1] \| */
	75	/* \| ... \| */
	76	/* \| 840 \| Rsvd4[0] \| */
	77	/* ------------------------------------------------------ */
	78	struct hv_monitor_page {
	79	union hv_monitor_trigger_state trigger_state;
	80	u32 rsvdz1;
	81
	82	union hv_monitor_trigger_group trigger_group[4];
	83	u64 rsvdz2[3];
	84
	85	s32 next_checktime[4][32];
	86
	87	u16 latency[4][32];
	88	u64 rsvdz3[32];
	89
	90	struct hv_monitor_parameter parameter[4][32];
	91
	92	u8 rsvdz4[1984];
	93	};
	94
	95	#define HV_HYPERCALL_PARAM_ALIGN sizeof(u64)
	96
	97	/* Definition of the hv_post_message hypercall input structure. */
	98	struct hv_input_post_message {
	99	union hv_connection_id connectionid;
	100	u32 reserved;
	101	u32 message_type;
	102	u32 payload_size;
	103	u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
	104	};
	105
	106
	107	enum {
	108	VMBUS_MESSAGE_CONNECTION_ID = 1,
	109	VMBUS_MESSAGE_CONNECTION_ID_4 = 4,
	110	VMBUS_MESSAGE_PORT_ID = 1,
	111	VMBUS_EVENT_CONNECTION_ID = 2,
	112	VMBUS_EVENT_PORT_ID = 2,
	113	VMBUS_MONITOR_CONNECTION_ID = 3,
	114	VMBUS_MONITOR_PORT_ID = 3,
	115	VMBUS_MESSAGE_SINT = 2,
	116	};
	117
	118	/*
	119	* Per cpu state for channel handling
	120	*/
	121	struct hv_per_cpu_context {
	122	void *synic_message_page;
	123	void *synic_event_page;
	124	/*
	125	* buffer to post messages to the host.
	126	*/
	127	void *post_msg_page;
	128
	129	/*
	130	* Starting with win8, we can take channel interrupts on any CPU;
	131	* we will manage the tasklet that handles events messages on a per CPU
	132	* basis.
	133	*/
	134	struct tasklet_struct msg_dpc;
	135	};
	136
	137	struct hv_context {
	138	/* We only support running on top of Hyper-V
	139	* So at this point this really can only contain the Hyper-V ID
	140	*/
	141	u64 guestid;
	142
	143	struct hv_per_cpu_context __percpu *cpu_context;
	144
	145	/*
	146	* To manage allocations in a NUMA node.
	147	* Array indexed by numa node ID.
	148	*/
	149	struct cpumask *hv_numa_map;
	150	};
	151
	152	extern struct hv_context hv_context;
	153
	154	/* Hv Interface */
	155
	156	extern int hv_init(void);
	157
	158	extern int hv_post_message(union hv_connection_id connection_id,
	159	enum hv_message_type message_type,
	160	void *payload, size_t payload_size);
	161
	162	extern int hv_synic_alloc(void);
	163
	164	extern void hv_synic_free(void);
	165
	166	extern void hv_synic_enable_regs(unsigned int cpu);
	167	extern int hv_synic_init(unsigned int cpu);
	168
	169	extern void hv_synic_disable_regs(unsigned int cpu);
	170	extern int hv_synic_cleanup(unsigned int cpu);
	171
	172	/* Interface */
	173
	174	void hv_ringbuffer_pre_init(struct vmbus_channel *channel);
	175
	176	int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
	177	struct page *pages, u32 pagecnt);
	178
	179	void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
	180
	181	int hv_ringbuffer_write(struct vmbus_channel *channel,
	182	const struct kvec *kv_list, u32 kv_count,
	183	u64 requestid);
	184
	185	int hv_ringbuffer_read(struct vmbus_channel *channel,
	186	void buffer, u32 buflen, u32 buffer_actual_len,
	187	u64 *requestid, bool raw);
	188
	189	/*
	190	* The Maximum number of channels (16384) is determined by the size of the
	191	* interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to
	192	* send endpoint interrupts, and the other is to receive endpoint interrupts.
	193	*/
	194	#define MAX_NUM_CHANNELS ((HV_HYP_PAGE_SIZE >> 1) << 3)
	195
	196	/* The value here must be in multiple of 32 */
	197	#define MAX_NUM_CHANNELS_SUPPORTED 256
	198
	199	#define MAX_CHANNEL_RELIDS \
	200	max(MAX_NUM_CHANNELS_SUPPORTED, HV_EVENT_FLAGS_COUNT)
	201
	202	enum vmbus_connect_state {
	203	DISCONNECTED,
	204	CONNECTING,
	205	CONNECTED,
	206	DISCONNECTING
	207	};
	208
	209	#define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
	210
	211	/*
	212	* The CPU that Hyper-V will interrupt for VMBUS messages, such as
	213	* CHANNELMSG_OFFERCHANNEL and CHANNELMSG_RESCIND_CHANNELOFFER.
	214	*/
	215	#define VMBUS_CONNECT_CPU 0
	216
	217	struct vmbus_connection {
	218	u32 msg_conn_id;
	219
	220	atomic_t offer_in_progress;
	221
	222	enum vmbus_connect_state conn_state;
	223
	224	atomic_t next_gpadl_handle;
	225
	226	struct completion unload_event;
	227	/*
	228	* Represents channel interrupts. Each bit position represents a
	229	* channel. When a channel sends an interrupt via VMBUS, it finds its
	230	* bit in the sendInterruptPage, set it and calls Hv to generate a port
	231	* event. The other end receives the port event and parse the
	232	* recvInterruptPage to see which bit is set
	233	*/
	234	void *int_page;
	235	void *send_int_page;
	236	void *recv_int_page;
	237
	238	/*
	239	* 2 pages - 1st page for parent->child notification and 2nd
	240	* is child->parent notification
	241	*/
	242	struct hv_monitor_page *monitor_pages[2];
	243	struct list_head chn_msg_list;
	244	spinlock_t channelmsg_lock;
	245
	246	/* List of channels */
	247	struct list_head chn_list;
	248	struct mutex channel_mutex;
	249
	250	/* Array of channels */
	251	struct vmbus_channel **channels;
	252
	253	/*
	254	* An offer message is handled first on the work_queue, and then
	255	* is further handled on handle_primary_chan_wq or
	256	* handle_sub_chan_wq.
	257	*/
	258	struct workqueue_struct *work_queue;
	259	struct workqueue_struct *handle_primary_chan_wq;
	260	struct workqueue_struct *handle_sub_chan_wq;
	261
	262	/*
	263	* The number of sub-channels and hv_sock channels that should be
	264	* cleaned up upon suspend: sub-channels will be re-created upon
	265	* resume, and hv_sock channels should not survive suspend.
	266	*/
	267	atomic_t nr_chan_close_on_suspend;
	268	/*
	269	* vmbus_bus_suspend() waits for "nr_chan_close_on_suspend" to
	270	* drop to zero.
	271	*/
	272	struct completion ready_for_suspend_event;
	273
	274	/*
	275	* The number of primary channels that should be "fixed up"
	276	* upon resume: these channels are re-offered upon resume, and some
	277	* fields of the channel offers (i.e. child_relid and connection_id)
	278	* can change, so the old offermsg must be fixed up, before the resume
	279	* callbacks of the VSC drivers start to further touch the channels.
	280	*/
	281	atomic_t nr_chan_fixup_on_resume;
	282	/*
	283	* vmbus_bus_resume() waits for "nr_chan_fixup_on_resume" to
	284	* drop to zero.
	285	*/
	286	struct completion ready_for_resume_event;
	287	};
	288
	289
	290	struct vmbus_msginfo {
	291	/* Bookkeeping stuff */
	292	struct list_head msglist_entry;
	293
	294	/* The message itself */
	295	unsigned char msg[];
	296	};
	297
	298
	299	extern struct vmbus_connection vmbus_connection;
	300
	301	int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version);
	302
	303	static inline void vmbus_send_interrupt(u32 relid)
	304	{
	305	sync_set_bit(relid, vmbus_connection.send_int_page);
	306	}
	307
	308	enum vmbus_message_handler_type {
	309	/* The related handler can sleep. */
	310	VMHT_BLOCKING = 0,
	311
	312	/* The related handler must NOT sleep. */
	313	VMHT_NON_BLOCKING = 1,
	314	};
	315
	316	struct vmbus_channel_message_table_entry {
	317	enum vmbus_channel_message_type message_type;
	318	enum vmbus_message_handler_type handler_type;
	319	void (message_handler)(struct vmbus_channel_message_header msg);
	320	u32 min_payload_len;
	321	};
	322
	323	extern const struct vmbus_channel_message_table_entry
	324	channel_message_table[CHANNELMSG_COUNT];
	325
	326
	327	/* General vmbus interface */
	328
	329	struct hv_device vmbus_device_create(const guid_t type,
	330	const guid_t *instance,
	331	struct vmbus_channel *channel);
	332
	333	int vmbus_device_register(struct hv_device *child_device_obj);
	334	void vmbus_device_unregister(struct hv_device *device_obj);
	335	int vmbus_add_channel_kobj(struct hv_device *device_obj,
	336	struct vmbus_channel *channel);
	337
	338	void vmbus_remove_channel_attr_group(struct vmbus_channel *channel);
	339
	340	void vmbus_channel_map_relid(struct vmbus_channel *channel);
	341	void vmbus_channel_unmap_relid(struct vmbus_channel *channel);
	342
	343	struct vmbus_channel *relid2channel(u32 relid);
	344
	345	void vmbus_free_channels(void);
	346
	347	/* Connection interface */
	348
	349	int vmbus_connect(void);
	350	void vmbus_disconnect(void);
	351
	352	int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
	353
	354	void vmbus_on_event(unsigned long data);
	355	void vmbus_on_msg_dpc(unsigned long data);
	356
	357	int hv_kvp_init(struct hv_util_service *srv);
	358	void hv_kvp_deinit(void);
	359	int hv_kvp_pre_suspend(void);
	360	int hv_kvp_pre_resume(void);
	361	void hv_kvp_onchannelcallback(void *context);
	362
	363	int hv_vss_init(struct hv_util_service *srv);
	364	void hv_vss_deinit(void);
	365	int hv_vss_pre_suspend(void);
	366	int hv_vss_pre_resume(void);
	367	void hv_vss_onchannelcallback(void *context);
	368
	369	int hv_fcopy_init(struct hv_util_service *srv);
	370	void hv_fcopy_deinit(void);
	371	int hv_fcopy_pre_suspend(void);
	372	int hv_fcopy_pre_resume(void);
	373	void hv_fcopy_onchannelcallback(void *context);
	374	void vmbus_initiate_unload(bool crash);
	375
	376	static inline void hv_poll_channel(struct vmbus_channel *channel,
	377	void (cb)(void ))
	378	{
	379	if (!channel)
	380	return;
	381	cb(channel);
	382	}
	383
	384	enum hvutil_device_state {
	385	HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */
	386	HVUTIL_READY, /* userspace is registered */
	387	HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
	388	HVUTIL_USERSPACE_REQ, /* request to userspace was sent */
	389	HVUTIL_USERSPACE_RECV, /* reply from userspace was received */
	390	HVUTIL_DEVICE_DYING, /* driver unload is in progress */
	391	};
	392
	393	enum delay {
	394	INTERRUPT_DELAY = 0,
	395	MESSAGE_DELAY = 1,
	396	};
	397
	398	extern const struct vmbus_device vmbus_devs[];
	399
	400	static inline bool hv_is_perf_channel(struct vmbus_channel *channel)
	401	{
	402	return vmbus_devs[channel->device_id].perf_device;
	403	}
	404
	405	static inline bool hv_is_alloced_cpu(unsigned int cpu)
	406	{
	407	struct vmbus_channel channel, sc;
	408
	409	lockdep_assert_held(&vmbus_connection.channel_mutex);
	410	/*
	411	* List additions/deletions as well as updates of the target CPUs are
	412	* protected by channel_mutex.
	413	*/
	414	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
	415	if (!hv_is_perf_channel(channel))
	416	continue;
	417	if (channel->target_cpu == cpu)
	418	return true;
	419	list_for_each_entry(sc, &channel->sc_list, sc_list) {
	420	if (sc->target_cpu == cpu)
	421	return true;
	422	}
	423	}
	424	return false;
	425	}
	426
	427	static inline void hv_set_alloced_cpu(unsigned int cpu)
	428	{
	429	cpumask_set_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
	430	}
	431
	432	static inline void hv_clear_alloced_cpu(unsigned int cpu)
	433	{
	434	if (hv_is_alloced_cpu(cpu))
	435	return;
	436	cpumask_clear_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
	437	}
	438
	439	static inline void hv_update_alloced_cpus(unsigned int old_cpu,
	440	unsigned int new_cpu)
	441	{
	442	hv_set_alloced_cpu(new_cpu);
	443	hv_clear_alloced_cpu(old_cpu);
	444	}
	445
	446	#ifdef CONFIG_HYPERV_TESTING
	447
	448	int hv_debug_add_dev_dir(struct hv_device *dev);
	449	void hv_debug_rm_dev_dir(struct hv_device *dev);
	450	void hv_debug_rm_all_dir(void);
	451	int hv_debug_init(void);
	452	void hv_debug_delay_test(struct vmbus_channel *channel, enum delay delay_type);
	453
	454	#else /* CONFIG_HYPERV_TESTING */
	455
	456	static inline void hv_debug_rm_dev_dir(struct hv_device *dev) {};
	457	static inline void hv_debug_rm_all_dir(void) {};
	458	static inline void hv_debug_delay_test(struct vmbus_channel *channel,
	459	enum delay delay_type) {};
	460	static inline int hv_debug_init(void)
	461	{
	462	return -1;
	463	}
	464
	465	static inline int hv_debug_add_dev_dir(struct hv_device *dev)
	466	{
	467	return -1;
	468	}
	469
	470	#endif /* CONFIG_HYPERV_TESTING */
	471
	472	#endif /* _HYPERV_VMBUS_H */