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 <linux/bitops.h> 17 #include <asm/sync_bitops.h> 18 #include <asm/hyperv-tlfs.h> 19 #include <linux/atomic.h> 20 #include <linux/hyperv.h> 21 #include <linux/interrupt.h> 22 23 #include "hv_trace.h" 24 25 /* 26 * Timeout for services such as KVP and fcopy. 27 */ 28 #define HV_UTIL_TIMEOUT 30 29 30 /* 31 * Timeout for guest-host handshake for services. 32 */ 33 #define HV_UTIL_NEGO_TIMEOUT 55 34 35 36 /* Definitions for the monitored notification facility */ 37 union hv_monitor_trigger_group { 38 u64 as_uint64; 39 struct { 40 u32 pending; 41 u32 armed; 42 }; 43 }; 44 45 struct hv_monitor_parameter { 46 union hv_connection_id connectionid; 47 u16 flagnumber; 48 u16 rsvdz; 49 }; 50 51 union hv_monitor_trigger_state { 52 u32 asu32; 53 54 struct { 55 u32 group_enable:4; 56 u32 rsvdz:28; 57 }; 58 }; 59 60 /* struct hv_monitor_page Layout */ 61 /* ------------------------------------------------------ */ 62 /* | 0 | TriggerState (4 bytes) | Rsvd1 (4 bytes) | */ 63 /* | 8 | TriggerGroup[0] | */ 64 /* | 10 | TriggerGroup[1] | */ 65 /* | 18 | TriggerGroup[2] | */ 66 /* | 20 | TriggerGroup[3] | */ 67 /* | 28 | Rsvd2[0] | */ 68 /* | 30 | Rsvd2[1] | */ 69 /* | 38 | Rsvd2[2] | */ 70 /* | 40 | NextCheckTime[0][0] | NextCheckTime[0][1] | */ 71 /* | ... | */ 72 /* | 240 | Latency[0][0..3] | */ 73 /* | 340 | Rsvz3[0] | */ 74 /* | 440 | Parameter[0][0] | */ 75 /* | 448 | Parameter[0][1] | */ 76 /* | ... | */ 77 /* | 840 | Rsvd4[0] | */ 78 /* ------------------------------------------------------ */ 79 struct hv_monitor_page { 80 union hv_monitor_trigger_state trigger_state; 81 u32 rsvdz1; 82 83 union hv_monitor_trigger_group trigger_group[4]; 84 u64 rsvdz2[3]; 85 86 s32 next_checktime[4][32]; 87 88 u16 latency[4][32]; 89 u64 rsvdz3[32]; 90 91 struct hv_monitor_parameter parameter[4][32]; 92 93 u8 rsvdz4[1984]; 94 }; 95 96 #define HV_HYPERCALL_PARAM_ALIGN sizeof(u64) 97 98 /* Definition of the hv_post_message hypercall input structure. */ 99 struct hv_input_post_message { 100 union hv_connection_id connectionid; 101 u32 reserved; 102 u32 message_type; 103 u32 payload_size; 104 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT]; 105 }; 106 107 108 enum { 109 VMBUS_MESSAGE_CONNECTION_ID = 1, 110 VMBUS_MESSAGE_CONNECTION_ID_4 = 4, 111 VMBUS_MESSAGE_PORT_ID = 1, 112 VMBUS_EVENT_CONNECTION_ID = 2, 113 VMBUS_EVENT_PORT_ID = 2, 114 VMBUS_MONITOR_CONNECTION_ID = 3, 115 VMBUS_MONITOR_PORT_ID = 3, 116 VMBUS_MESSAGE_SINT = 2, 117 }; 118 119 /* 120 * Per cpu state for channel handling 121 */ 122 struct hv_per_cpu_context { 123 void *synic_message_page; 124 void *synic_event_page; 125 126 /* 127 * The page is only used in hv_post_message() for a TDX VM (with the 128 * paravisor) to post a messages to Hyper-V: when such a VM calls 129 * HVCALL_POST_MESSAGE, it can't use the hyperv_pcpu_input_arg (which 130 * is encrypted in such a VM) as the hypercall input page, because 131 * the input page for HVCALL_POST_MESSAGE must be decrypted in such a 132 * VM, so post_msg_page (which is decrypted in hv_synic_alloc()) is 133 * introduced for this purpose. See hyperv_init() for more comments. 134 */ 135 void *post_msg_page; 136 137 /* 138 * Starting with win8, we can take channel interrupts on any CPU; 139 * we will manage the tasklet that handles events messages on a per CPU 140 * basis. 141 */ 142 struct tasklet_struct msg_dpc; 143 }; 144 145 struct hv_context { 146 /* We only support running on top of Hyper-V 147 * So at this point this really can only contain the Hyper-V ID 148 */ 149 u64 guestid; 150 151 struct hv_per_cpu_context __percpu *cpu_context; 152 153 /* 154 * To manage allocations in a NUMA node. 155 * Array indexed by numa node ID. 156 */ 157 struct cpumask *hv_numa_map; 158 }; 159 160 extern struct hv_context hv_context; 161 162 /* Hv Interface */ 163 164 extern int hv_init(void); 165 166 extern int hv_post_message(union hv_connection_id connection_id, 167 enum hv_message_type message_type, 168 void *payload, size_t payload_size); 169 170 extern int hv_synic_alloc(void); 171 172 extern void hv_synic_free(void); 173 174 extern void hv_synic_enable_regs(unsigned int cpu); 175 extern int hv_synic_init(unsigned int cpu); 176 177 extern void hv_synic_disable_regs(unsigned int cpu); 178 extern int hv_synic_cleanup(unsigned int cpu); 179 180 /* Interface */ 181 182 void hv_ringbuffer_pre_init(struct vmbus_channel *channel); 183 184 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, 185 struct page *pages, u32 pagecnt, u32 max_pkt_size); 186 187 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info); 188 189 int hv_ringbuffer_write(struct vmbus_channel *channel, 190 const struct kvec *kv_list, u32 kv_count, 191 u64 requestid, u64 *trans_id); 192 193 int hv_ringbuffer_read(struct vmbus_channel *channel, 194 void *buffer, u32 buflen, u32 *buffer_actual_len, 195 u64 *requestid, bool raw); 196 197 /* 198 * The Maximum number of channels (16384) is determined by the size of the 199 * interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to 200 * send endpoint interrupts, and the other is to receive endpoint interrupts. 201 */ 202 #define MAX_NUM_CHANNELS ((HV_HYP_PAGE_SIZE >> 1) << 3) 203 204 /* The value here must be in multiple of 32 */ 205 #define MAX_NUM_CHANNELS_SUPPORTED 256 206 207 #define MAX_CHANNEL_RELIDS \ 208 max(MAX_NUM_CHANNELS_SUPPORTED, HV_EVENT_FLAGS_COUNT) 209 210 enum vmbus_connect_state { 211 DISCONNECTED, 212 CONNECTING, 213 CONNECTED, 214 DISCONNECTING 215 }; 216 217 #define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT 218 219 /* 220 * The CPU that Hyper-V will interrupt for VMBUS messages, such as 221 * CHANNELMSG_OFFERCHANNEL and CHANNELMSG_RESCIND_CHANNELOFFER. 222 */ 223 #define VMBUS_CONNECT_CPU 0 224 225 struct vmbus_connection { 226 u32 msg_conn_id; 227 228 atomic_t offer_in_progress; 229 230 enum vmbus_connect_state conn_state; 231 232 atomic_t next_gpadl_handle; 233 234 struct completion unload_event; 235 /* 236 * Represents channel interrupts. Each bit position represents a 237 * channel. When a channel sends an interrupt via VMBUS, it finds its 238 * bit in the sendInterruptPage, set it and calls Hv to generate a port 239 * event. The other end receives the port event and parse the 240 * recvInterruptPage to see which bit is set 241 */ 242 void *int_page; 243 void *send_int_page; 244 void *recv_int_page; 245 246 /* 247 * 2 pages - 1st page for parent->child notification and 2nd 248 * is child->parent notification 249 */ 250 struct hv_monitor_page *monitor_pages[2]; 251 struct list_head chn_msg_list; 252 spinlock_t channelmsg_lock; 253 254 /* List of channels */ 255 struct list_head chn_list; 256 struct mutex channel_mutex; 257 258 /* Array of channels */ 259 struct vmbus_channel **channels; 260 261 /* 262 * An offer message is handled first on the work_queue, and then 263 * is further handled on handle_primary_chan_wq or 264 * handle_sub_chan_wq. 265 */ 266 struct workqueue_struct *work_queue; 267 struct workqueue_struct *handle_primary_chan_wq; 268 struct workqueue_struct *handle_sub_chan_wq; 269 struct workqueue_struct *rescind_work_queue; 270 271 /* 272 * On suspension of the vmbus, the accumulated offer messages 273 * must be dropped. 274 */ 275 bool ignore_any_offer_msg; 276 277 /* 278 * The number of sub-channels and hv_sock channels that should be 279 * cleaned up upon suspend: sub-channels will be re-created upon 280 * resume, and hv_sock channels should not survive suspend. 281 */ 282 atomic_t nr_chan_close_on_suspend; 283 /* 284 * vmbus_bus_suspend() waits for "nr_chan_close_on_suspend" to 285 * drop to zero. 286 */ 287 struct completion ready_for_suspend_event; 288 289 /* 290 * The number of primary channels that should be "fixed up" 291 * upon resume: these channels are re-offered upon resume, and some 292 * fields of the channel offers (i.e. child_relid and connection_id) 293 * can change, so the old offermsg must be fixed up, before the resume 294 * callbacks of the VSC drivers start to further touch the channels. 295 */ 296 atomic_t nr_chan_fixup_on_resume; 297 /* 298 * vmbus_bus_resume() waits for "nr_chan_fixup_on_resume" to 299 * drop to zero. 300 */ 301 struct completion ready_for_resume_event; 302 }; 303 304 305 struct vmbus_msginfo { 306 /* Bookkeeping stuff */ 307 struct list_head msglist_entry; 308 309 /* The message itself */ 310 unsigned char msg[]; 311 }; 312 313 314 extern struct vmbus_connection vmbus_connection; 315 316 int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version); 317 318 static inline void vmbus_send_interrupt(u32 relid) 319 { 320 sync_set_bit(relid, vmbus_connection.send_int_page); 321 } 322 323 enum vmbus_message_handler_type { 324 /* The related handler can sleep. */ 325 VMHT_BLOCKING = 0, 326 327 /* The related handler must NOT sleep. */ 328 VMHT_NON_BLOCKING = 1, 329 }; 330 331 struct vmbus_channel_message_table_entry { 332 enum vmbus_channel_message_type message_type; 333 enum vmbus_message_handler_type handler_type; 334 void (*message_handler)(struct vmbus_channel_message_header *msg); 335 u32 min_payload_len; 336 }; 337 338 extern const struct vmbus_channel_message_table_entry 339 channel_message_table[CHANNELMSG_COUNT]; 340 341 342 /* General vmbus interface */ 343 344 struct hv_device *vmbus_device_create(const guid_t *type, 345 const guid_t *instance, 346 struct vmbus_channel *channel); 347 348 int vmbus_device_register(struct hv_device *child_device_obj); 349 void vmbus_device_unregister(struct hv_device *device_obj); 350 int vmbus_add_channel_kobj(struct hv_device *device_obj, 351 struct vmbus_channel *channel); 352 353 void vmbus_remove_channel_attr_group(struct vmbus_channel *channel); 354 355 void vmbus_channel_map_relid(struct vmbus_channel *channel); 356 void vmbus_channel_unmap_relid(struct vmbus_channel *channel); 357 358 struct vmbus_channel *relid2channel(u32 relid); 359 360 void vmbus_free_channels(void); 361 362 /* Connection interface */ 363 364 int vmbus_connect(void); 365 void vmbus_disconnect(void); 366 367 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep); 368 369 void vmbus_on_event(unsigned long data); 370 void vmbus_on_msg_dpc(unsigned long data); 371 372 int hv_kvp_init(struct hv_util_service *srv); 373 void hv_kvp_deinit(void); 374 int hv_kvp_pre_suspend(void); 375 int hv_kvp_pre_resume(void); 376 void hv_kvp_onchannelcallback(void *context); 377 378 int hv_vss_init(struct hv_util_service *srv); 379 void hv_vss_deinit(void); 380 int hv_vss_pre_suspend(void); 381 int hv_vss_pre_resume(void); 382 void hv_vss_onchannelcallback(void *context); 383 384 int hv_fcopy_init(struct hv_util_service *srv); 385 void hv_fcopy_deinit(void); 386 int hv_fcopy_pre_suspend(void); 387 int hv_fcopy_pre_resume(void); 388 void hv_fcopy_onchannelcallback(void *context); 389 void vmbus_initiate_unload(bool crash); 390 391 static inline void hv_poll_channel(struct vmbus_channel *channel, 392 void (*cb)(void *)) 393 { 394 if (!channel) 395 return; 396 cb(channel); 397 } 398 399 enum hvutil_device_state { 400 HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */ 401 HVUTIL_READY, /* userspace is registered */ 402 HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */ 403 HVUTIL_USERSPACE_REQ, /* request to userspace was sent */ 404 HVUTIL_USERSPACE_RECV, /* reply from userspace was received */ 405 HVUTIL_DEVICE_DYING, /* driver unload is in progress */ 406 }; 407 408 enum delay { 409 INTERRUPT_DELAY = 0, 410 MESSAGE_DELAY = 1, 411 }; 412 413 extern const struct vmbus_device vmbus_devs[]; 414 415 static inline bool hv_is_perf_channel(struct vmbus_channel *channel) 416 { 417 return vmbus_devs[channel->device_id].perf_device; 418 } 419 420 static inline bool hv_is_allocated_cpu(unsigned int cpu) 421 { 422 struct vmbus_channel *channel, *sc; 423 424 lockdep_assert_held(&vmbus_connection.channel_mutex); 425 /* 426 * List additions/deletions as well as updates of the target CPUs are 427 * protected by channel_mutex. 428 */ 429 list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { 430 if (!hv_is_perf_channel(channel)) 431 continue; 432 if (channel->target_cpu == cpu) 433 return true; 434 list_for_each_entry(sc, &channel->sc_list, sc_list) { 435 if (sc->target_cpu == cpu) 436 return true; 437 } 438 } 439 return false; 440 } 441 442 static inline void hv_set_allocated_cpu(unsigned int cpu) 443 { 444 cpumask_set_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]); 445 } 446 447 static inline void hv_clear_allocated_cpu(unsigned int cpu) 448 { 449 if (hv_is_allocated_cpu(cpu)) 450 return; 451 cpumask_clear_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]); 452 } 453 454 static inline void hv_update_allocated_cpus(unsigned int old_cpu, 455 unsigned int new_cpu) 456 { 457 hv_set_allocated_cpu(new_cpu); 458 hv_clear_allocated_cpu(old_cpu); 459 } 460 461 #ifdef CONFIG_HYPERV_TESTING 462 463 int hv_debug_add_dev_dir(struct hv_device *dev); 464 void hv_debug_rm_dev_dir(struct hv_device *dev); 465 void hv_debug_rm_all_dir(void); 466 int hv_debug_init(void); 467 void hv_debug_delay_test(struct vmbus_channel *channel, enum delay delay_type); 468 469 #else /* CONFIG_HYPERV_TESTING */ 470 471 static inline void hv_debug_rm_dev_dir(struct hv_device *dev) {}; 472 static inline void hv_debug_rm_all_dir(void) {}; 473 static inline void hv_debug_delay_test(struct vmbus_channel *channel, 474 enum delay delay_type) {}; 475 static inline int hv_debug_init(void) 476 { 477 return -1; 478 } 479 480 static inline int hv_debug_add_dev_dir(struct hv_device *dev) 481 { 482 return -1; 483 } 484 485 #endif /* CONFIG_HYPERV_TESTING */ 486 487 #endif /* _HYPERV_VMBUS_H */ 488