drivers/hv/hyperv_vmbus.h

   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         struct list_head chn_msg_list;
 245         spinlock_t channelmsg_lock;
 246
 247         /* List of channels */
 248         struct list_head chn_list;
 249         struct mutex channel_mutex;
 250
 251         /* Array of channels */
 252         struct vmbus_channel **channels;
 253
 254         /*
 255          * An offer message is handled first on the work_queue, and then
 256          * is further handled on handle_primary_chan_wq or
 257          * handle_sub_chan_wq.
 258          */
 259         struct workqueue_struct *work_queue;
 260         struct workqueue_struct *handle_primary_chan_wq;
 261         struct workqueue_struct *handle_sub_chan_wq;
 262
 263         /*
 264          * The number of sub-channels and hv_sock channels that should be
 265          * cleaned up upon suspend: sub-channels will be re-created upon
 266          * resume, and hv_sock channels should not survive suspend.
 267          */
 268         atomic_t nr_chan_close_on_suspend;
 269         /*
 270          * vmbus_bus_suspend() waits for "nr_chan_close_on_suspend" to
 271          * drop to zero.
 272          */
 273         struct completion ready_for_suspend_event;
 274
 275         /*
 276          * The number of primary channels that should be "fixed up"
 277          * upon resume: these channels are re-offered upon resume, and some
 278          * fields of the channel offers (i.e. child_relid and connection_id)
 279          * can change, so the old offermsg must be fixed up, before the resume
 280          * callbacks of the VSC drivers start to further touch the channels.
 281          */
 282         atomic_t nr_chan_fixup_on_resume;
 283         /*
 284          * vmbus_bus_resume() waits for "nr_chan_fixup_on_resume" to
 285          * drop to zero.
 286          */
 287         struct completion ready_for_resume_event;
 288 };
 289
 290
 291 struct vmbus_msginfo {
 292         /* Bookkeeping stuff */
 293         struct list_head msglist_entry;
 294
 295         /* The message itself */
 296         unsigned char msg[];
 297 };
 298
 299
 300 extern struct vmbus_connection vmbus_connection;
 301
 302 int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version);
 303
 304 static inline void vmbus_send_interrupt(u32 relid)
 305 {
 306         sync_set_bit(relid, vmbus_connection.send_int_page);
 307 }
 308
 309 enum vmbus_message_handler_type {
 310         /* The related handler can sleep. */
 311         VMHT_BLOCKING = 0,
 312
 313         /* The related handler must NOT sleep. */
 314         VMHT_NON_BLOCKING = 1,
 315 };
 316
 317 struct vmbus_channel_message_table_entry {
 318         enum vmbus_channel_message_type message_type;
 319         enum vmbus_message_handler_type handler_type;
 320         void (*message_handler)(struct vmbus_channel_message_header *msg);
 321         u32 min_payload_len;
 322 };
 323
 324 extern const struct vmbus_channel_message_table_entry
 325         channel_message_table[CHANNELMSG_COUNT];
 326
 327
 328 /* General vmbus interface */
 329
 330 struct hv_device *vmbus_device_create(const guid_t *type,
 331                                       const guid_t *instance,
 332                                       struct vmbus_channel *channel);
 333
 334 int vmbus_device_register(struct hv_device *child_device_obj);
 335 void vmbus_device_unregister(struct hv_device *device_obj);
 336 int vmbus_add_channel_kobj(struct hv_device *device_obj,
 337                            struct vmbus_channel *channel);
 338
 339 void vmbus_remove_channel_attr_group(struct vmbus_channel *channel);
 340
 341 void vmbus_channel_map_relid(struct vmbus_channel *channel);
 342 void vmbus_channel_unmap_relid(struct vmbus_channel *channel);
 343
 344 struct vmbus_channel *relid2channel(u32 relid);
 345
 346 void vmbus_free_channels(void);
 347
 348 /* Connection interface */
 349
 350 int vmbus_connect(void);
 351 void vmbus_disconnect(void);
 352
 353 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
 354
 355 void vmbus_on_event(unsigned long data);
 356 void vmbus_on_msg_dpc(unsigned long data);
 357
 358 int hv_kvp_init(struct hv_util_service *srv);
 359 void hv_kvp_deinit(void);
 360 int hv_kvp_pre_suspend(void);
 361 int hv_kvp_pre_resume(void);
 362 void hv_kvp_onchannelcallback(void *context);
 363
 364 int hv_vss_init(struct hv_util_service *srv);
 365 void hv_vss_deinit(void);
 366 int hv_vss_pre_suspend(void);
 367 int hv_vss_pre_resume(void);
 368 void hv_vss_onchannelcallback(void *context);
 369
 370 int hv_fcopy_init(struct hv_util_service *srv);
 371 void hv_fcopy_deinit(void);
 372 int hv_fcopy_pre_suspend(void);
 373 int hv_fcopy_pre_resume(void);
 374 void hv_fcopy_onchannelcallback(void *context);
 375 void vmbus_initiate_unload(bool crash);
 376
 377 static inline void hv_poll_channel(struct vmbus_channel *channel,
 378                                    void (*cb)(void *))
 379 {
 380         if (!channel)
 381                 return;
 382         cb(channel);
 383 }
 384
 385 enum hvutil_device_state {
 386         HVUTIL_DEVICE_INIT = 0,  /* driver is loaded, waiting for userspace */
 387         HVUTIL_READY,            /* userspace is registered */
 388         HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
 389         HVUTIL_USERSPACE_REQ,    /* request to userspace was sent */
 390         HVUTIL_USERSPACE_RECV,   /* reply from userspace was received */
 391         HVUTIL_DEVICE_DYING,     /* driver unload is in progress */
 392 };
 393
 394 enum delay {
 395         INTERRUPT_DELAY = 0,
 396         MESSAGE_DELAY   = 1,
 397 };
 398
 399 extern const struct vmbus_device vmbus_devs[];
 400
 401 static inline bool hv_is_perf_channel(struct vmbus_channel *channel)
 402 {
 403         return vmbus_devs[channel->device_id].perf_device;
 404 }
 405
 406 static inline bool hv_is_alloced_cpu(unsigned int cpu)
 407 {
 408         struct vmbus_channel *channel, *sc;
 409
 410         lockdep_assert_held(&vmbus_connection.channel_mutex);
 411         /*
 412          * List additions/deletions as well as updates of the target CPUs are
 413          * protected by channel_mutex.
 414          */
 415         list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
 416                 if (!hv_is_perf_channel(channel))
 417                         continue;
 418                 if (channel->target_cpu == cpu)
 419                         return true;
 420                 list_for_each_entry(sc, &channel->sc_list, sc_list) {
 421                         if (sc->target_cpu == cpu)
 422                                 return true;
 423                 }
 424         }
 425         return false;
 426 }
 427
 428 static inline void hv_set_alloced_cpu(unsigned int cpu)
 429 {
 430         cpumask_set_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
 431 }
 432
 433 static inline void hv_clear_alloced_cpu(unsigned int cpu)
 434 {
 435         if (hv_is_alloced_cpu(cpu))
 436                 return;
 437         cpumask_clear_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
 438 }
 439
 440 static inline void hv_update_alloced_cpus(unsigned int old_cpu,
 441                                           unsigned int new_cpu)
 442 {
 443         hv_set_alloced_cpu(new_cpu);
 444         hv_clear_alloced_cpu(old_cpu);
 445 }
 446
 447 #ifdef CONFIG_HYPERV_TESTING
 448
 449 int hv_debug_add_dev_dir(struct hv_device *dev);
 450 void hv_debug_rm_dev_dir(struct hv_device *dev);
 451 void hv_debug_rm_all_dir(void);
 452 int hv_debug_init(void);
 453 void hv_debug_delay_test(struct vmbus_channel *channel, enum delay delay_type);
 454
 455 #else /* CONFIG_HYPERV_TESTING */
 456
 457 static inline void hv_debug_rm_dev_dir(struct hv_device *dev) {};
 458 static inline void hv_debug_rm_all_dir(void) {};
 459 static inline void hv_debug_delay_test(struct vmbus_channel *channel,
 460                                        enum delay delay_type) {};
 461 static inline int hv_debug_init(void)
 462 {
 463         return -1;
 464 }
 465
 466 static inline int hv_debug_add_dev_dir(struct hv_device *dev)
 467 {
 468         return -1;
 469 }
 470
 471 #endif /* CONFIG_HYPERV_TESTING */
 472
 473 #endif /* _HYPERV_VMBUS_H */