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 * buffer to post messages to the host. 127 */ 128 void *post_msg_page; 129 130 /* 131 * Starting with win8, we can take channel interrupts on any CPU; 132 * we will manage the tasklet that handles events messages on a per CPU 133 * basis. 134 */ 135 struct tasklet_struct msg_dpc; 136 }; 137 138 struct hv_context { 139 /* We only support running on top of Hyper-V 140 * So at this point this really can only contain the Hyper-V ID 141 */ 142 u64 guestid; 143 144 struct hv_per_cpu_context __percpu *cpu_context; 145 146 /* 147 * To manage allocations in a NUMA node. 148 * Array indexed by numa node ID. 149 */ 150 struct cpumask *hv_numa_map; 151 }; 152 153 extern struct hv_context hv_context; 154 155 /* Hv Interface */ 156 157 extern int hv_init(void); 158 159 extern int hv_post_message(union hv_connection_id connection_id, 160 enum hv_message_type message_type, 161 void *payload, size_t payload_size); 162 163 extern int hv_synic_alloc(void); 164 165 extern void hv_synic_free(void); 166 167 extern void hv_synic_enable_regs(unsigned int cpu); 168 extern int hv_synic_init(unsigned int cpu); 169 170 extern void hv_synic_disable_regs(unsigned int cpu); 171 extern int hv_synic_cleanup(unsigned int cpu); 172 173 /* Interface */ 174 175 void hv_ringbuffer_pre_init(struct vmbus_channel *channel); 176 177 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, 178 struct page *pages, u32 pagecnt, u32 max_pkt_size); 179 180 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info); 181 182 int hv_ringbuffer_write(struct vmbus_channel *channel, 183 const struct kvec *kv_list, u32 kv_count, 184 u64 requestid); 185 186 int hv_ringbuffer_read(struct vmbus_channel *channel, 187 void *buffer, u32 buflen, u32 *buffer_actual_len, 188 u64 *requestid, bool raw); 189 190 /* 191 * The Maximum number of channels (16384) is determined by the size of the 192 * interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to 193 * send endpoint interrupts, and the other is to receive endpoint interrupts. 194 */ 195 #define MAX_NUM_CHANNELS ((HV_HYP_PAGE_SIZE >> 1) << 3) 196 197 /* The value here must be in multiple of 32 */ 198 #define MAX_NUM_CHANNELS_SUPPORTED 256 199 200 #define MAX_CHANNEL_RELIDS \ 201 max(MAX_NUM_CHANNELS_SUPPORTED, HV_EVENT_FLAGS_COUNT) 202 203 enum vmbus_connect_state { 204 DISCONNECTED, 205 CONNECTING, 206 CONNECTED, 207 DISCONNECTING 208 }; 209 210 #define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT 211 212 /* 213 * The CPU that Hyper-V will interrupt for VMBUS messages, such as 214 * CHANNELMSG_OFFERCHANNEL and CHANNELMSG_RESCIND_CHANNELOFFER. 215 */ 216 #define VMBUS_CONNECT_CPU 0 217 218 struct vmbus_connection { 219 u32 msg_conn_id; 220 221 atomic_t offer_in_progress; 222 223 enum vmbus_connect_state conn_state; 224 225 atomic_t next_gpadl_handle; 226 227 struct completion unload_event; 228 /* 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 234 */ 235 void *int_page; 236 void *send_int_page; 237 void *recv_int_page; 238 239 /* 240 * 2 pages - 1st page for parent->child notification and 2nd 241 * is child->parent notification 242 */ 243 struct hv_monitor_page *monitor_pages[2]; 244 void *monitor_pages_original[2]; 245 phys_addr_t monitor_pages_pa[2]; 246 struct list_head chn_msg_list; 247 spinlock_t channelmsg_lock; 248 249 /* List of channels */ 250 struct list_head chn_list; 251 struct mutex channel_mutex; 252 253 /* Array of channels */ 254 struct vmbus_channel **channels; 255 256 /* 257 * An offer message is handled first on the work_queue, and then 258 * is further handled on handle_primary_chan_wq or 259 * handle_sub_chan_wq. 260 */ 261 struct workqueue_struct *work_queue; 262 struct workqueue_struct *handle_primary_chan_wq; 263 struct workqueue_struct *handle_sub_chan_wq; 264 265 /* 266 * The number of sub-channels and hv_sock channels that should be 267 * cleaned up upon suspend: sub-channels will be re-created upon 268 * resume, and hv_sock channels should not survive suspend. 269 */ 270 atomic_t nr_chan_close_on_suspend; 271 /* 272 * vmbus_bus_suspend() waits for "nr_chan_close_on_suspend" to 273 * drop to zero. 274 */ 275 struct completion ready_for_suspend_event; 276 277 /* 278 * The number of primary channels that should be "fixed up" 279 * upon resume: these channels are re-offered upon resume, and some 280 * fields of the channel offers (i.e. child_relid and connection_id) 281 * can change, so the old offermsg must be fixed up, before the resume 282 * callbacks of the VSC drivers start to further touch the channels. 283 */ 284 atomic_t nr_chan_fixup_on_resume; 285 /* 286 * vmbus_bus_resume() waits for "nr_chan_fixup_on_resume" to 287 * drop to zero. 288 */ 289 struct completion ready_for_resume_event; 290 }; 291 292 293 struct vmbus_msginfo { 294 /* Bookkeeping stuff */ 295 struct list_head msglist_entry; 296 297 /* The message itself */ 298 unsigned char msg[]; 299 }; 300 301 302 extern struct vmbus_connection vmbus_connection; 303 304 int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version); 305 306 static inline void vmbus_send_interrupt(u32 relid) 307 { 308 sync_set_bit(relid, vmbus_connection.send_int_page); 309 } 310 311 enum vmbus_message_handler_type { 312 /* The related handler can sleep. */ 313 VMHT_BLOCKING = 0, 314 315 /* The related handler must NOT sleep. */ 316 VMHT_NON_BLOCKING = 1, 317 }; 318 319 struct vmbus_channel_message_table_entry { 320 enum vmbus_channel_message_type message_type; 321 enum vmbus_message_handler_type handler_type; 322 void (*message_handler)(struct vmbus_channel_message_header *msg); 323 u32 min_payload_len; 324 }; 325 326 extern const struct vmbus_channel_message_table_entry 327 channel_message_table[CHANNELMSG_COUNT]; 328 329 330 /* General vmbus interface */ 331 332 struct hv_device *vmbus_device_create(const guid_t *type, 333 const guid_t *instance, 334 struct vmbus_channel *channel); 335 336 int vmbus_device_register(struct hv_device *child_device_obj); 337 void vmbus_device_unregister(struct hv_device *device_obj); 338 int vmbus_add_channel_kobj(struct hv_device *device_obj, 339 struct vmbus_channel *channel); 340 341 void vmbus_remove_channel_attr_group(struct vmbus_channel *channel); 342 343 void vmbus_channel_map_relid(struct vmbus_channel *channel); 344 void vmbus_channel_unmap_relid(struct vmbus_channel *channel); 345 346 struct vmbus_channel *relid2channel(u32 relid); 347 348 void vmbus_free_channels(void); 349 350 /* Connection interface */ 351 352 int vmbus_connect(void); 353 void vmbus_disconnect(void); 354 355 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep); 356 357 void vmbus_on_event(unsigned long data); 358 void vmbus_on_msg_dpc(unsigned long data); 359 360 int hv_kvp_init(struct hv_util_service *srv); 361 void hv_kvp_deinit(void); 362 int hv_kvp_pre_suspend(void); 363 int hv_kvp_pre_resume(void); 364 void hv_kvp_onchannelcallback(void *context); 365 366 int hv_vss_init(struct hv_util_service *srv); 367 void hv_vss_deinit(void); 368 int hv_vss_pre_suspend(void); 369 int hv_vss_pre_resume(void); 370 void hv_vss_onchannelcallback(void *context); 371 372 int hv_fcopy_init(struct hv_util_service *srv); 373 void hv_fcopy_deinit(void); 374 int hv_fcopy_pre_suspend(void); 375 int hv_fcopy_pre_resume(void); 376 void hv_fcopy_onchannelcallback(void *context); 377 void vmbus_initiate_unload(bool crash); 378 379 static inline void hv_poll_channel(struct vmbus_channel *channel, 380 void (*cb)(void *)) 381 { 382 if (!channel) 383 return; 384 cb(channel); 385 } 386 387 enum hvutil_device_state { 388 HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */ 389 HVUTIL_READY, /* userspace is registered */ 390 HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */ 391 HVUTIL_USERSPACE_REQ, /* request to userspace was sent */ 392 HVUTIL_USERSPACE_RECV, /* reply from userspace was received */ 393 HVUTIL_DEVICE_DYING, /* driver unload is in progress */ 394 }; 395 396 enum delay { 397 INTERRUPT_DELAY = 0, 398 MESSAGE_DELAY = 1, 399 }; 400 401 extern const struct vmbus_device vmbus_devs[]; 402 403 static inline bool hv_is_perf_channel(struct vmbus_channel *channel) 404 { 405 return vmbus_devs[channel->device_id].perf_device; 406 } 407 408 static inline bool hv_is_allocated_cpu(unsigned int cpu) 409 { 410 struct vmbus_channel *channel, *sc; 411 412 lockdep_assert_held(&vmbus_connection.channel_mutex); 413 /* 414 * List additions/deletions as well as updates of the target CPUs are 415 * protected by channel_mutex. 416 */ 417 list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { 418 if (!hv_is_perf_channel(channel)) 419 continue; 420 if (channel->target_cpu == cpu) 421 return true; 422 list_for_each_entry(sc, &channel->sc_list, sc_list) { 423 if (sc->target_cpu == cpu) 424 return true; 425 } 426 } 427 return false; 428 } 429 430 static inline void hv_set_allocated_cpu(unsigned int cpu) 431 { 432 cpumask_set_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]); 433 } 434 435 static inline void hv_clear_allocated_cpu(unsigned int cpu) 436 { 437 if (hv_is_allocated_cpu(cpu)) 438 return; 439 cpumask_clear_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]); 440 } 441 442 static inline void hv_update_allocated_cpus(unsigned int old_cpu, 443 unsigned int new_cpu) 444 { 445 hv_set_allocated_cpu(new_cpu); 446 hv_clear_allocated_cpu(old_cpu); 447 } 448 449 #ifdef CONFIG_HYPERV_TESTING 450 451 int hv_debug_add_dev_dir(struct hv_device *dev); 452 void hv_debug_rm_dev_dir(struct hv_device *dev); 453 void hv_debug_rm_all_dir(void); 454 int hv_debug_init(void); 455 void hv_debug_delay_test(struct vmbus_channel *channel, enum delay delay_type); 456 457 #else /* CONFIG_HYPERV_TESTING */ 458 459 static inline void hv_debug_rm_dev_dir(struct hv_device *dev) {}; 460 static inline void hv_debug_rm_all_dir(void) {}; 461 static inline void hv_debug_delay_test(struct vmbus_channel *channel, 462 enum delay delay_type) {}; 463 static inline int hv_debug_init(void) 464 { 465 return -1; 466 } 467 468 static inline int hv_debug_add_dev_dir(struct hv_device *dev) 469 { 470 return -1; 471 } 472 473 #endif /* CONFIG_HYPERV_TESTING */ 474 475 #endif /* _HYPERV_VMBUS_H */ 476