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 <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>
  21
  22 #include "hv_trace.h"
  23
  24 /*
  25  * Timeout for services such as KVP and fcopy.
  26  */
  27 #define HV_UTIL_TIMEOUT 30
  28
  29 /*
  30  * Timeout for guest-host handshake for services.
  31  */
  32 #define HV_UTIL_NEGO_TIMEOUT 55
  33
  34
  35 /* Definitions for the monitored notification facility */
  36 union hv_monitor_trigger_group {
  37         u64 as_uint64;
  38         struct {
  39                 u32 pending;
  40                 u32 armed;
  41         };
  42 };
  43
  44 struct hv_monitor_parameter {
  45         union hv_connection_id connectionid;
  46         u16 flagnumber;
  47         u16 rsvdz;
  48 };
  49
  50 union hv_monitor_trigger_state {
  51         u32 asu32;
  52
  53         struct {
  54                 u32 group_enable:4;
  55                 u32 rsvdz:28;
  56         };
  57 };
  58
  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] | */
  70 /* | ...                                                | */
  71 /* | 240 | Latency[0][0..3]                             | */
  72 /* | 340 | Rsvz3[0]                                     | */
  73 /* | 440 | Parameter[0][0]                              | */
  74 /* | 448 | Parameter[0][1]                              | */
  75 /* | ...                                                | */
  76 /* | 840 | Rsvd4[0]                                     | */
  77 /* ------------------------------------------------------ */
  78 struct hv_monitor_page {
  79         union hv_monitor_trigger_state trigger_state;
  80         u32 rsvdz1;
  81
  82         union hv_monitor_trigger_group trigger_group[4];
  83         u64 rsvdz2[3];
  84
  85         s32 next_checktime[4][32];
  86
  87         u16 latency[4][32];
  88         u64 rsvdz3[32];
  89
  90         struct hv_monitor_parameter parameter[4][32];
  91
  92         u8 rsvdz4[1984];
  93 };
  94
  95 #define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
  96
  97 /* Definition of the hv_post_message hypercall input structure. */
  98 struct hv_input_post_message {
  99         union hv_connection_id connectionid;
 100         u32 reserved;
 101         u32 message_type;
 102         u32 payload_size;
 103         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 104 };
 105
 106
 107 enum {
 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,
 116 };
 117
 118 /*
 119  * Per cpu state for channel handling
 120  */
 121 struct hv_per_cpu_context {
 122         void *synic_message_page;
 123         void *synic_event_page;
 124         /*
 125          * buffer to post messages to the host.
 126          */
 127         void *post_msg_page;
 128
 129         /*
 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
 132          * basis.
 133          */
 134         struct tasklet_struct msg_dpc;
 135
 136         /*
 137          * To optimize the mapping of relid to channel, maintain
 138          * per-cpu list of the channels based on their CPU affinity.
 139          */
 140         struct list_head chan_list;
 141 };
 142
 143 struct hv_context {
 144         /* We only support running on top of Hyper-V
 145          * So at this point this really can only contain the Hyper-V ID
 146          */
 147         u64 guestid;
 148
 149         struct hv_per_cpu_context __percpu *cpu_context;
 150
 151         /*
 152          * To manage allocations in a NUMA node.
 153          * Array indexed by numa node ID.
 154          */
 155         struct cpumask *hv_numa_map;
 156 };
 157
 158 extern struct hv_context hv_context;
 159
 160 /* Hv Interface */
 161
 162 extern int hv_init(void);
 163
 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);
 167
 168 extern int hv_synic_alloc(void);
 169
 170 extern void hv_synic_free(void);
 171
 172 extern void hv_synic_enable_regs(unsigned int cpu);
 173 extern int hv_synic_init(unsigned int cpu);
 174
 175 extern void hv_synic_disable_regs(unsigned int cpu);
 176 extern int hv_synic_cleanup(unsigned int cpu);
 177
 178 /* Interface */
 179
 180 void hv_ringbuffer_pre_init(struct vmbus_channel *channel);
 181
 182 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
 183                        struct page *pages, u32 pagecnt);
 184
 185 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
 186
 187 int hv_ringbuffer_write(struct vmbus_channel *channel,
 188                         const struct kvec *kv_list, u32 kv_count);
 189
 190 int hv_ringbuffer_read(struct vmbus_channel *channel,
 191                        void *buffer, u32 buflen, u32 *buffer_actual_len,
 192                        u64 *requestid, bool raw);
 193
 194 /*
 195  * The Maximum number of channels (16348) is determined by the size of the
 196  * interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to
 197  * send endpoint interrupts, and the other is to receive endpoint interrupts.
 198  */
 199 #define MAX_NUM_CHANNELS        ((HV_HYP_PAGE_SIZE >> 1) << 3)
 200
 201 /* The value here must be in multiple of 32 */
 202 /* TODO: Need to make this configurable */
 203 #define MAX_NUM_CHANNELS_SUPPORTED      256
 204
 205
 206 enum vmbus_connect_state {
 207         DISCONNECTED,
 208         CONNECTING,
 209         CONNECTED,
 210         DISCONNECTING
 211 };
 212
 213 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
 214
 215 /*
 216  * The CPU that Hyper-V will interrupt for VMBUS messages, such as
 217  * CHANNELMSG_OFFERCHANNEL and CHANNELMSG_RESCIND_CHANNELOFFER.
 218  */
 219 #define VMBUS_CONNECT_CPU       0
 220
 221 struct vmbus_connection {
 222         u32 msg_conn_id;
 223
 224         atomic_t offer_in_progress;
 225
 226         enum vmbus_connect_state conn_state;
 227
 228         atomic_t next_gpadl_handle;
 229
 230         struct completion  unload_event;
 231         /*
 232          * Represents channel interrupts. Each bit position represents a
 233          * channel.  When a channel sends an interrupt via VMBUS, it finds its
 234          * bit in the sendInterruptPage, set it and calls Hv to generate a port
 235          * event. The other end receives the port event and parse the
 236          * recvInterruptPage to see which bit is set
 237          */
 238         void *int_page;
 239         void *send_int_page;
 240         void *recv_int_page;
 241
 242         /*
 243          * 2 pages - 1st page for parent->child notification and 2nd
 244          * is child->parent notification
 245          */
 246         struct hv_monitor_page *monitor_pages[2];
 247         struct list_head chn_msg_list;
 248         spinlock_t channelmsg_lock;
 249
 250         /* List of channels */
 251         struct list_head chn_list;
 252         struct mutex channel_mutex;
 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 };
 322
 323 extern const struct vmbus_channel_message_table_entry
 324         channel_message_table[CHANNELMSG_COUNT];
 325
 326
 327 /* General vmbus interface */
 328
 329 struct hv_device *vmbus_device_create(const guid_t *type,
 330                                       const guid_t *instance,
 331                                       struct vmbus_channel *channel);
 332
 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);
 337
 338 void vmbus_remove_channel_attr_group(struct vmbus_channel *channel);
 339
 340 struct vmbus_channel *relid2channel(u32 relid);
 341
 342 void vmbus_free_channels(void);
 343
 344 /* Connection interface */
 345
 346 int vmbus_connect(void);
 347 void vmbus_disconnect(void);
 348
 349 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
 350
 351 void vmbus_on_event(unsigned long data);
 352 void vmbus_on_msg_dpc(unsigned long data);
 353
 354 int hv_kvp_init(struct hv_util_service *srv);
 355 void hv_kvp_deinit(void);
 356 int hv_kvp_pre_suspend(void);
 357 int hv_kvp_pre_resume(void);
 358 void hv_kvp_onchannelcallback(void *context);
 359
 360 int hv_vss_init(struct hv_util_service *srv);
 361 void hv_vss_deinit(void);
 362 int hv_vss_pre_suspend(void);
 363 int hv_vss_pre_resume(void);
 364 void hv_vss_onchannelcallback(void *context);
 365
 366 int hv_fcopy_init(struct hv_util_service *srv);
 367 void hv_fcopy_deinit(void);
 368 int hv_fcopy_pre_suspend(void);
 369 int hv_fcopy_pre_resume(void);
 370 void hv_fcopy_onchannelcallback(void *context);
 371 void vmbus_initiate_unload(bool crash);
 372
 373 static inline void hv_poll_channel(struct vmbus_channel *channel,
 374                                    void (*cb)(void *))
 375 {
 376         if (!channel)
 377                 return;
 378
 379         if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
 380                 cb(channel);
 381                 return;
 382         }
 383         smp_call_function_single(channel->target_cpu, cb, channel, true);
 384 }
 385
 386 enum hvutil_device_state {
 387         HVUTIL_DEVICE_INIT = 0,  /* driver is loaded, waiting for userspace */
 388         HVUTIL_READY,            /* userspace is registered */
 389         HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
 390         HVUTIL_USERSPACE_REQ,    /* request to userspace was sent */
 391         HVUTIL_USERSPACE_RECV,   /* reply from userspace was received */
 392         HVUTIL_DEVICE_DYING,     /* driver unload is in progress */
 393 };
 394
 395 enum delay {
 396         INTERRUPT_DELAY = 0,
 397         MESSAGE_DELAY   = 1,
 398 };
 399
 400 #ifdef CONFIG_HYPERV_TESTING
 401
 402 int hv_debug_add_dev_dir(struct hv_device *dev);
 403 void hv_debug_rm_dev_dir(struct hv_device *dev);
 404 void hv_debug_rm_all_dir(void);
 405 int hv_debug_init(void);
 406 void hv_debug_delay_test(struct vmbus_channel *channel, enum delay delay_type);
 407
 408 #else /* CONFIG_HYPERV_TESTING */
 409
 410 static inline void hv_debug_rm_dev_dir(struct hv_device *dev) {};
 411 static inline void hv_debug_rm_all_dir(void) {};
 412 static inline void hv_debug_delay_test(struct vmbus_channel *channel,
 413                                        enum delay delay_type) {};
 414 static inline int hv_debug_init(void)
 415 {
 416         return -1;
 417 }
 418
 419 static inline int hv_debug_add_dev_dir(struct hv_device *dev)
 420 {
 421         return -1;
 422 }
 423
 424 #endif /* CONFIG_HYPERV_TESTING */
 425
 426 #endif /* _HYPERV_VMBUS_H */