drivers/hv/hyperv_vmbus.h

   1 /*
   2  *
   3  * Copyright (c) 2011, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *   K. Y. Srinivasan <kys@microsoft.com>
  22  *
  23  */
  24
  25 #ifndef _HYPERV_VMBUS_H
  26 #define _HYPERV_VMBUS_H
  27
  28 #include <linux/list.h>
  29 #include <asm/sync_bitops.h>
  30 #include <linux/atomic.h>
  31 #include <linux/hyperv.h>
  32 #include <linux/interrupt.h>
  33
  34 /*
  35  * Timeout for services such as KVP and fcopy.
  36  */
  37 #define HV_UTIL_TIMEOUT 30
  38
  39 /*
  40  * Timeout for guest-host handshake for services.
  41  */
  42 #define HV_UTIL_NEGO_TIMEOUT 55
  43
  44 /* Define synthetic interrupt controller flag constants. */
  45 #define HV_EVENT_FLAGS_COUNT            (256 * 8)
  46 #define HV_EVENT_FLAGS_LONG_COUNT       (256 / sizeof(unsigned long))
  47
  48 /*
  49  * Timer configuration register.
  50  */
  51 union hv_timer_config {
  52         u64 as_uint64;
  53         struct {
  54                 u64 enable:1;
  55                 u64 periodic:1;
  56                 u64 lazy:1;
  57                 u64 auto_enable:1;
  58                 u64 reserved_z0:12;
  59                 u64 sintx:4;
  60                 u64 reserved_z1:44;
  61         };
  62 };
  63
  64
  65 /* Define the synthetic interrupt controller event flags format. */
  66 union hv_synic_event_flags {
  67         unsigned long flags[HV_EVENT_FLAGS_LONG_COUNT];
  68 };
  69
  70 /* Define SynIC control register. */
  71 union hv_synic_scontrol {
  72         u64 as_uint64;
  73         struct {
  74                 u64 enable:1;
  75                 u64 reserved:63;
  76         };
  77 };
  78
  79 /* Define synthetic interrupt source. */
  80 union hv_synic_sint {
  81         u64 as_uint64;
  82         struct {
  83                 u64 vector:8;
  84                 u64 reserved1:8;
  85                 u64 masked:1;
  86                 u64 auto_eoi:1;
  87                 u64 reserved2:46;
  88         };
  89 };
  90
  91 /* Define the format of the SIMP register */
  92 union hv_synic_simp {
  93         u64 as_uint64;
  94         struct {
  95                 u64 simp_enabled:1;
  96                 u64 preserved:11;
  97                 u64 base_simp_gpa:52;
  98         };
  99 };
 100
 101 /* Define the format of the SIEFP register */
 102 union hv_synic_siefp {
 103         u64 as_uint64;
 104         struct {
 105                 u64 siefp_enabled:1;
 106                 u64 preserved:11;
 107                 u64 base_siefp_gpa:52;
 108         };
 109 };
 110
 111 /* Definitions for the monitored notification facility */
 112 union hv_monitor_trigger_group {
 113         u64 as_uint64;
 114         struct {
 115                 u32 pending;
 116                 u32 armed;
 117         };
 118 };
 119
 120 struct hv_monitor_parameter {
 121         union hv_connection_id connectionid;
 122         u16 flagnumber;
 123         u16 rsvdz;
 124 };
 125
 126 union hv_monitor_trigger_state {
 127         u32 asu32;
 128
 129         struct {
 130                 u32 group_enable:4;
 131                 u32 rsvdz:28;
 132         };
 133 };
 134
 135 /* struct hv_monitor_page Layout */
 136 /* ------------------------------------------------------ */
 137 /* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
 138 /* | 8   | TriggerGroup[0]                              | */
 139 /* | 10  | TriggerGroup[1]                              | */
 140 /* | 18  | TriggerGroup[2]                              | */
 141 /* | 20  | TriggerGroup[3]                              | */
 142 /* | 28  | Rsvd2[0]                                     | */
 143 /* | 30  | Rsvd2[1]                                     | */
 144 /* | 38  | Rsvd2[2]                                     | */
 145 /* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
 146 /* | ...                                                | */
 147 /* | 240 | Latency[0][0..3]                             | */
 148 /* | 340 | Rsvz3[0]                                     | */
 149 /* | 440 | Parameter[0][0]                              | */
 150 /* | 448 | Parameter[0][1]                              | */
 151 /* | ...                                                | */
 152 /* | 840 | Rsvd4[0]                                     | */
 153 /* ------------------------------------------------------ */
 154 struct hv_monitor_page {
 155         union hv_monitor_trigger_state trigger_state;
 156         u32 rsvdz1;
 157
 158         union hv_monitor_trigger_group trigger_group[4];
 159         u64 rsvdz2[3];
 160
 161         s32 next_checktime[4][32];
 162
 163         u16 latency[4][32];
 164         u64 rsvdz3[32];
 165
 166         struct hv_monitor_parameter parameter[4][32];
 167
 168         u8 rsvdz4[1984];
 169 };
 170
 171 #define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
 172
 173 /* Definition of the hv_post_message hypercall input structure. */
 174 struct hv_input_post_message {
 175         union hv_connection_id connectionid;
 176         u32 reserved;
 177         u32 message_type;
 178         u32 payload_size;
 179         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 180 };
 181
 182
 183 enum {
 184         VMBUS_MESSAGE_CONNECTION_ID     = 1,
 185         VMBUS_MESSAGE_PORT_ID           = 1,
 186         VMBUS_EVENT_CONNECTION_ID       = 2,
 187         VMBUS_EVENT_PORT_ID             = 2,
 188         VMBUS_MONITOR_CONNECTION_ID     = 3,
 189         VMBUS_MONITOR_PORT_ID           = 3,
 190         VMBUS_MESSAGE_SINT              = 2,
 191 };
 192
 193 /*
 194  * Per cpu state for channel handling
 195  */
 196 struct hv_per_cpu_context {
 197         void *synic_message_page;
 198         void *synic_event_page;
 199         /*
 200          * buffer to post messages to the host.
 201          */
 202         void *post_msg_page;
 203
 204         /*
 205          * Starting with win8, we can take channel interrupts on any CPU;
 206          * we will manage the tasklet that handles events messages on a per CPU
 207          * basis.
 208          */
 209         struct tasklet_struct msg_dpc;
 210
 211         /*
 212          * To optimize the mapping of relid to channel, maintain
 213          * per-cpu list of the channels based on their CPU affinity.
 214          */
 215         struct list_head chan_list;
 216         struct clock_event_device *clk_evt;
 217 };
 218
 219 struct hv_context {
 220         /* We only support running on top of Hyper-V
 221          * So at this point this really can only contain the Hyper-V ID
 222          */
 223         u64 guestid;
 224
 225         void *tsc_page;
 226
 227         bool synic_initialized;
 228
 229         struct hv_per_cpu_context __percpu *cpu_context;
 230
 231         /*
 232          * Hypervisor's notion of virtual processor ID is different from
 233          * Linux' notion of CPU ID. This information can only be retrieved
 234          * in the context of the calling CPU. Setup a map for easy access
 235          * to this information:
 236          *
 237          * vp_index[a] is the Hyper-V's processor ID corresponding to
 238          * Linux cpuid 'a'.
 239          */
 240         u32 vp_index[NR_CPUS];
 241
 242         /*
 243          * To manage allocations in a NUMA node.
 244          * Array indexed by numa node ID.
 245          */
 246         struct cpumask *hv_numa_map;
 247 };
 248
 249 extern struct hv_context hv_context;
 250
 251 /* Hv Interface */
 252
 253 extern int hv_init(void);
 254
 255 extern int hv_post_message(union hv_connection_id connection_id,
 256                          enum hv_message_type message_type,
 257                          void *payload, size_t payload_size);
 258
 259 extern int hv_synic_alloc(void);
 260
 261 extern void hv_synic_free(void);
 262
 263 extern int hv_synic_init(unsigned int cpu);
 264
 265 extern int hv_synic_cleanup(unsigned int cpu);
 266
 267 extern void hv_synic_clockevents_cleanup(void);
 268
 269 /* Interface */
 270
 271
 272 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
 273                        struct page *pages, u32 pagecnt);
 274
 275 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
 276
 277 int hv_ringbuffer_write(struct vmbus_channel *channel,
 278                         const struct kvec *kv_list, u32 kv_count);
 279
 280 int hv_ringbuffer_read(struct vmbus_channel *channel,
 281                        void *buffer, u32 buflen, u32 *buffer_actual_len,
 282                        u64 *requestid, bool raw);
 283
 284 /*
 285  * Maximum channels is determined by the size of the interrupt page
 286  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
 287  * and the other is receive endpoint interrupt
 288  */
 289 #define MAX_NUM_CHANNELS        ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
 290
 291 /* The value here must be in multiple of 32 */
 292 /* TODO: Need to make this configurable */
 293 #define MAX_NUM_CHANNELS_SUPPORTED      256
 294
 295
 296 enum vmbus_connect_state {
 297         DISCONNECTED,
 298         CONNECTING,
 299         CONNECTED,
 300         DISCONNECTING
 301 };
 302
 303 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
 304
 305 struct vmbus_connection {
 306         /*
 307          * CPU on which the initial host contact was made.
 308          */
 309         int connect_cpu;
 310
 311         atomic_t offer_in_progress;
 312
 313         enum vmbus_connect_state conn_state;
 314
 315         atomic_t next_gpadl_handle;
 316
 317         struct completion  unload_event;
 318         /*
 319          * Represents channel interrupts. Each bit position represents a
 320          * channel.  When a channel sends an interrupt via VMBUS, it finds its
 321          * bit in the sendInterruptPage, set it and calls Hv to generate a port
 322          * event. The other end receives the port event and parse the
 323          * recvInterruptPage to see which bit is set
 324          */
 325         void *int_page;
 326         void *send_int_page;
 327         void *recv_int_page;
 328
 329         /*
 330          * 2 pages - 1st page for parent->child notification and 2nd
 331          * is child->parent notification
 332          */
 333         struct hv_monitor_page *monitor_pages[2];
 334         struct list_head chn_msg_list;
 335         spinlock_t channelmsg_lock;
 336
 337         /* List of channels */
 338         struct list_head chn_list;
 339         struct mutex channel_mutex;
 340
 341         struct workqueue_struct *work_queue;
 342 };
 343
 344
 345 struct vmbus_msginfo {
 346         /* Bookkeeping stuff */
 347         struct list_head msglist_entry;
 348
 349         /* The message itself */
 350         unsigned char msg[0];
 351 };
 352
 353
 354 extern struct vmbus_connection vmbus_connection;
 355
 356 static inline void vmbus_send_interrupt(u32 relid)
 357 {
 358         sync_set_bit(relid, vmbus_connection.send_int_page);
 359 }
 360
 361 enum vmbus_message_handler_type {
 362         /* The related handler can sleep. */
 363         VMHT_BLOCKING = 0,
 364
 365         /* The related handler must NOT sleep. */
 366         VMHT_NON_BLOCKING = 1,
 367 };
 368
 369 struct vmbus_channel_message_table_entry {
 370         enum vmbus_channel_message_type message_type;
 371         enum vmbus_message_handler_type handler_type;
 372         void (*message_handler)(struct vmbus_channel_message_header *msg);
 373 };
 374
 375 extern const struct vmbus_channel_message_table_entry
 376         channel_message_table[CHANNELMSG_COUNT];
 377
 378
 379 /* General vmbus interface */
 380
 381 struct hv_device *vmbus_device_create(const uuid_le *type,
 382                                       const uuid_le *instance,
 383                                       struct vmbus_channel *channel);
 384
 385 int vmbus_device_register(struct hv_device *child_device_obj);
 386 void vmbus_device_unregister(struct hv_device *device_obj);
 387
 388 struct vmbus_channel *relid2channel(u32 relid);
 389
 390 void vmbus_free_channels(void);
 391
 392 /* Connection interface */
 393
 394 int vmbus_connect(void);
 395 void vmbus_disconnect(void);
 396
 397 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
 398
 399 void vmbus_on_event(unsigned long data);
 400 void vmbus_on_msg_dpc(unsigned long data);
 401
 402 int hv_kvp_init(struct hv_util_service *srv);
 403 void hv_kvp_deinit(void);
 404 void hv_kvp_onchannelcallback(void *context);
 405
 406 int hv_vss_init(struct hv_util_service *srv);
 407 void hv_vss_deinit(void);
 408 void hv_vss_onchannelcallback(void *context);
 409
 410 int hv_fcopy_init(struct hv_util_service *srv);
 411 void hv_fcopy_deinit(void);
 412 void hv_fcopy_onchannelcallback(void *context);
 413 void vmbus_initiate_unload(bool crash);
 414
 415 static inline void hv_poll_channel(struct vmbus_channel *channel,
 416                                    void (*cb)(void *))
 417 {
 418         if (!channel)
 419                 return;
 420
 421         if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
 422                 cb(channel);
 423                 return;
 424         }
 425         smp_call_function_single(channel->target_cpu, cb, channel, true);
 426 }
 427
 428 enum hvutil_device_state {
 429         HVUTIL_DEVICE_INIT = 0,  /* driver is loaded, waiting for userspace */
 430         HVUTIL_READY,            /* userspace is registered */
 431         HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
 432         HVUTIL_USERSPACE_REQ,    /* request to userspace was sent */
 433         HVUTIL_USERSPACE_RECV,   /* reply from userspace was received */
 434         HVUTIL_DEVICE_DYING,     /* driver unload is in progress */
 435 };
 436
 437 #endif /* _HYPERV_VMBUS_H */