1 /* SPDX-License-Identifier: GPL-2.0-only */
4 * Copyright (c) 2011, Microsoft Corporation.
12 #ifndef _HYPERV_VMBUS_H
13 #define _HYPERV_VMBUS_H
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>
25 * Timeout for services such as KVP and fcopy.
27 #define HV_UTIL_TIMEOUT 30
30 * Timeout for guest-host handshake for services.
32 #define HV_UTIL_NEGO_TIMEOUT 55
35 /* Definitions for the monitored notification facility */
36 union hv_monitor_trigger_group {
44 struct hv_monitor_parameter {
45 union hv_connection_id connectionid;
50 union hv_monitor_trigger_state {
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] | */
71 /* | 240 | Latency[0][0..3] | */
72 /* | 340 | Rsvz3[0] | */
73 /* | 440 | Parameter[0][0] | */
74 /* | 448 | Parameter[0][1] | */
76 /* | 840 | Rsvd4[0] | */
77 /* ------------------------------------------------------ */
78 struct hv_monitor_page {
79 union hv_monitor_trigger_state trigger_state;
82 union hv_monitor_trigger_group trigger_group[4];
85 s32 next_checktime[4][32];
90 struct hv_monitor_parameter parameter[4][32];
95 #define HV_HYPERCALL_PARAM_ALIGN sizeof(u64)
97 /* Definition of the hv_post_message hypercall input structure. */
98 struct hv_input_post_message {
99 union hv_connection_id connectionid;
103 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
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,
119 * Per cpu state for channel handling
121 struct hv_per_cpu_context {
122 void *synic_message_page;
123 void *synic_event_page;
125 * buffer to post messages to the host.
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
134 struct tasklet_struct msg_dpc;
137 * To optimize the mapping of relid to channel, maintain
138 * per-cpu list of the channels based on their CPU affinity.
140 struct list_head chan_list;
144 /* We only support running on top of Hyper-V
145 * So at this point this really can only contain the Hyper-V ID
149 struct hv_per_cpu_context __percpu *cpu_context;
152 * To manage allocations in a NUMA node.
153 * Array indexed by numa node ID.
155 struct cpumask *hv_numa_map;
158 extern struct hv_context hv_context;
162 extern int hv_init(void);
164 extern int hv_post_message(union hv_connection_id connection_id,
165 enum hv_message_type message_type,
166 void *payload, size_t payload_size);
168 extern int hv_synic_alloc(void);
170 extern void hv_synic_free(void);
172 extern int hv_synic_init(unsigned int cpu);
174 extern int hv_synic_cleanup(unsigned int cpu);
178 void hv_ringbuffer_pre_init(struct vmbus_channel *channel);
180 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
181 struct page *pages, u32 pagecnt);
183 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
185 int hv_ringbuffer_write(struct vmbus_channel *channel,
186 const struct kvec *kv_list, u32 kv_count);
188 int hv_ringbuffer_read(struct vmbus_channel *channel,
189 void *buffer, u32 buflen, u32 *buffer_actual_len,
190 u64 *requestid, bool raw);
193 * The Maximum number of channels (16348) is determined by the size of the
194 * interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to
195 * send endpoint interrupts, and the other is to receive endpoint interrupts.
197 #define MAX_NUM_CHANNELS ((HV_HYP_PAGE_SIZE >> 1) << 3)
199 /* The value here must be in multiple of 32 */
200 /* TODO: Need to make this configurable */
201 #define MAX_NUM_CHANNELS_SUPPORTED 256
204 enum vmbus_connect_state {
211 #define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
213 struct vmbus_connection {
215 * CPU on which the initial host contact was made.
221 atomic_t offer_in_progress;
223 enum vmbus_connect_state conn_state;
225 atomic_t next_gpadl_handle;
227 struct completion unload_event;
229 * Represents channel interrupts. Each bit position represents a
230 * channel. When a channel sends an interrupt via VMBUS, it finds its
231 * bit in the sendInterruptPage, set it and calls Hv to generate a port
232 * event. The other end receives the port event and parse the
233 * recvInterruptPage to see which bit is set
240 * 2 pages - 1st page for parent->child notification and 2nd
241 * is child->parent notification
243 struct hv_monitor_page *monitor_pages[2];
244 struct list_head chn_msg_list;
245 spinlock_t channelmsg_lock;
247 /* List of channels */
248 struct list_head chn_list;
249 struct mutex channel_mutex;
252 * An offer message is handled first on the work_queue, and then
253 * is further handled on handle_primary_chan_wq or
254 * handle_sub_chan_wq.
256 struct workqueue_struct *work_queue;
257 struct workqueue_struct *handle_primary_chan_wq;
258 struct workqueue_struct *handle_sub_chan_wq;
262 struct vmbus_msginfo {
263 /* Bookkeeping stuff */
264 struct list_head msglist_entry;
266 /* The message itself */
267 unsigned char msg[0];
271 extern struct vmbus_connection vmbus_connection;
273 static inline void vmbus_send_interrupt(u32 relid)
275 sync_set_bit(relid, vmbus_connection.send_int_page);
278 enum vmbus_message_handler_type {
279 /* The related handler can sleep. */
282 /* The related handler must NOT sleep. */
283 VMHT_NON_BLOCKING = 1,
286 struct vmbus_channel_message_table_entry {
287 enum vmbus_channel_message_type message_type;
288 enum vmbus_message_handler_type handler_type;
289 void (*message_handler)(struct vmbus_channel_message_header *msg);
292 extern const struct vmbus_channel_message_table_entry
293 channel_message_table[CHANNELMSG_COUNT];
296 /* General vmbus interface */
298 struct hv_device *vmbus_device_create(const guid_t *type,
299 const guid_t *instance,
300 struct vmbus_channel *channel);
302 int vmbus_device_register(struct hv_device *child_device_obj);
303 void vmbus_device_unregister(struct hv_device *device_obj);
304 int vmbus_add_channel_kobj(struct hv_device *device_obj,
305 struct vmbus_channel *channel);
307 void vmbus_remove_channel_attr_group(struct vmbus_channel *channel);
309 struct vmbus_channel *relid2channel(u32 relid);
311 void vmbus_free_channels(void);
313 /* Connection interface */
315 int vmbus_connect(void);
316 void vmbus_disconnect(void);
318 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
320 void vmbus_on_event(unsigned long data);
321 void vmbus_on_msg_dpc(unsigned long data);
323 int hv_kvp_init(struct hv_util_service *srv);
324 void hv_kvp_deinit(void);
325 void hv_kvp_onchannelcallback(void *context);
327 int hv_vss_init(struct hv_util_service *srv);
328 void hv_vss_deinit(void);
329 void hv_vss_onchannelcallback(void *context);
331 int hv_fcopy_init(struct hv_util_service *srv);
332 void hv_fcopy_deinit(void);
333 void hv_fcopy_onchannelcallback(void *context);
334 void vmbus_initiate_unload(bool crash);
336 static inline void hv_poll_channel(struct vmbus_channel *channel,
342 if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
346 smp_call_function_single(channel->target_cpu, cb, channel, true);
349 enum hvutil_device_state {
350 HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */
351 HVUTIL_READY, /* userspace is registered */
352 HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
353 HVUTIL_USERSPACE_REQ, /* request to userspace was sent */
354 HVUTIL_USERSPACE_RECV, /* reply from userspace was received */
355 HVUTIL_DEVICE_DYING, /* driver unload is in progress */
358 #endif /* _HYPERV_VMBUS_H */