1 /* SPDX-License-Identifier: GPL-2.0-only */
4 * Copyright (c) 2011, Microsoft Corporation.
7 * Haiyang Zhang <haiyangz@microsoft.com>
8 * Hank Janssen <hjanssen@microsoft.com>
9 * K. Y. Srinivasan <kys@microsoft.com>
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;
138 /* We only support running on top of Hyper-V
139 * So at this point this really can only contain the Hyper-V ID
143 struct hv_per_cpu_context __percpu *cpu_context;
146 * To manage allocations in a NUMA node.
147 * Array indexed by numa node ID.
149 struct cpumask *hv_numa_map;
152 extern struct hv_context hv_context;
156 extern int hv_init(void);
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);
162 extern int hv_synic_alloc(void);
164 extern void hv_synic_free(void);
166 extern void hv_synic_enable_regs(unsigned int cpu);
167 extern int hv_synic_init(unsigned int cpu);
169 extern void hv_synic_disable_regs(unsigned int cpu);
170 extern int hv_synic_cleanup(unsigned int cpu);
174 void hv_ringbuffer_pre_init(struct vmbus_channel *channel);
176 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
177 struct page *pages, u32 pagecnt);
179 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
181 int hv_ringbuffer_write(struct vmbus_channel *channel,
182 const struct kvec *kv_list, u32 kv_count);
184 int hv_ringbuffer_read(struct vmbus_channel *channel,
185 void *buffer, u32 buflen, u32 *buffer_actual_len,
186 u64 *requestid, bool raw);
189 * The Maximum number of channels (16348) is determined by the size of the
190 * interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to
191 * send endpoint interrupts, and the other is to receive endpoint interrupts.
193 #define MAX_NUM_CHANNELS ((HV_HYP_PAGE_SIZE >> 1) << 3)
195 /* The value here must be in multiple of 32 */
196 /* TODO: Need to make this configurable */
197 #define MAX_NUM_CHANNELS_SUPPORTED 256
199 #define MAX_CHANNEL_RELIDS \
200 max(MAX_NUM_CHANNELS_SUPPORTED, HV_EVENT_FLAGS_COUNT)
202 enum vmbus_connect_state {
209 #define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
212 * The CPU that Hyper-V will interrupt for VMBUS messages, such as
213 * CHANNELMSG_OFFERCHANNEL and CHANNELMSG_RESCIND_CHANNELOFFER.
215 #define VMBUS_CONNECT_CPU 0
217 struct vmbus_connection {
220 atomic_t offer_in_progress;
222 enum vmbus_connect_state conn_state;
224 atomic_t next_gpadl_handle;
226 struct completion unload_event;
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
239 * 2 pages - 1st page for parent->child notification and 2nd
240 * is child->parent notification
242 struct hv_monitor_page *monitor_pages[2];
243 struct list_head chn_msg_list;
244 spinlock_t channelmsg_lock;
246 /* List of channels */
247 struct list_head chn_list;
248 struct mutex channel_mutex;
250 /* Array of channels */
251 struct vmbus_channel **channels;
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.
258 struct workqueue_struct *work_queue;
259 struct workqueue_struct *handle_primary_chan_wq;
260 struct workqueue_struct *handle_sub_chan_wq;
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.
267 atomic_t nr_chan_close_on_suspend;
269 * vmbus_bus_suspend() waits for "nr_chan_close_on_suspend" to
272 struct completion ready_for_suspend_event;
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.
281 atomic_t nr_chan_fixup_on_resume;
283 * vmbus_bus_resume() waits for "nr_chan_fixup_on_resume" to
286 struct completion ready_for_resume_event;
290 struct vmbus_msginfo {
291 /* Bookkeeping stuff */
292 struct list_head msglist_entry;
294 /* The message itself */
299 extern struct vmbus_connection vmbus_connection;
301 int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version);
303 static inline void vmbus_send_interrupt(u32 relid)
305 sync_set_bit(relid, vmbus_connection.send_int_page);
308 enum vmbus_message_handler_type {
309 /* The related handler can sleep. */
312 /* The related handler must NOT sleep. */
313 VMHT_NON_BLOCKING = 1,
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);
323 extern const struct vmbus_channel_message_table_entry
324 channel_message_table[CHANNELMSG_COUNT];
327 /* General vmbus interface */
329 struct hv_device *vmbus_device_create(const guid_t *type,
330 const guid_t *instance,
331 struct vmbus_channel *channel);
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);
338 void vmbus_remove_channel_attr_group(struct vmbus_channel *channel);
340 void vmbus_channel_map_relid(struct vmbus_channel *channel);
341 void vmbus_channel_unmap_relid(struct vmbus_channel *channel);
343 struct vmbus_channel *relid2channel(u32 relid);
345 void vmbus_free_channels(void);
347 /* Connection interface */
349 int vmbus_connect(void);
350 void vmbus_disconnect(void);
352 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
354 void vmbus_on_event(unsigned long data);
355 void vmbus_on_msg_dpc(unsigned long data);
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);
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);
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);
376 static inline void hv_poll_channel(struct vmbus_channel *channel,
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 */
398 extern const struct vmbus_device vmbus_devs[];
400 static inline bool hv_is_perf_channel(struct vmbus_channel *channel)
402 return vmbus_devs[channel->device_id].perf_device;
405 static inline bool hv_is_alloced_cpu(unsigned int cpu)
407 struct vmbus_channel *channel, *sc;
409 lockdep_assert_held(&vmbus_connection.channel_mutex);
411 * List additions/deletions as well as updates of the target CPUs are
412 * protected by channel_mutex.
414 list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
415 if (!hv_is_perf_channel(channel))
417 if (channel->target_cpu == cpu)
419 list_for_each_entry(sc, &channel->sc_list, sc_list) {
420 if (sc->target_cpu == cpu)
427 static inline void hv_set_alloced_cpu(unsigned int cpu)
429 cpumask_set_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
432 static inline void hv_clear_alloced_cpu(unsigned int cpu)
434 if (hv_is_alloced_cpu(cpu))
436 cpumask_clear_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
439 static inline void hv_update_alloced_cpus(unsigned int old_cpu,
440 unsigned int new_cpu)
442 hv_set_alloced_cpu(new_cpu);
443 hv_clear_alloced_cpu(old_cpu);
446 #ifdef CONFIG_HYPERV_TESTING
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);
454 #else /* CONFIG_HYPERV_TESTING */
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)
465 static inline int hv_debug_add_dev_dir(struct hv_device *dev)
470 #endif /* CONFIG_HYPERV_TESTING */
472 #endif /* _HYPERV_VMBUS_H */