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 <asm/hyperv-tlfs.h>
  31 #include <linux/atomic.h>
  32 #include <linux/hyperv.h>
  33 #include <linux/interrupt.h>
  34
  35 #include "hv_trace.h"
  36
  37 /*
  38  * Timeout for services such as KVP and fcopy.
  39  */
  40 #define HV_UTIL_TIMEOUT 30
  41
  42 /*
  43  * Timeout for guest-host handshake for services.
  44  */
  45 #define HV_UTIL_NEGO_TIMEOUT 55
  46
  47 /* Define synthetic interrupt controller flag constants. */
  48 #define HV_EVENT_FLAGS_COUNT            (256 * 8)
  49 #define HV_EVENT_FLAGS_LONG_COUNT       (256 / sizeof(unsigned long))
  50
  51 /*
  52  * Timer configuration register.
  53  */
  54 union hv_timer_config {
  55         u64 as_uint64;
  56         struct {
  57                 u64 enable:1;
  58                 u64 periodic:1;
  59                 u64 lazy:1;
  60                 u64 auto_enable:1;
  61                 u64 apic_vector:8;
  62                 u64 direct_mode:1;
  63                 u64 reserved_z0:3;
  64                 u64 sintx:4;
  65                 u64 reserved_z1:44;
  66         };
  67 };
  68
  69
  70 /* Define the synthetic interrupt controller event flags format. */
  71 union hv_synic_event_flags {
  72         unsigned long flags[HV_EVENT_FLAGS_LONG_COUNT];
  73 };
  74
  75 /* Define SynIC control register. */
  76 union hv_synic_scontrol {
  77         u64 as_uint64;
  78         struct {
  79                 u64 enable:1;
  80                 u64 reserved:63;
  81         };
  82 };
  83
  84 /* Define synthetic interrupt source. */
  85 union hv_synic_sint {
  86         u64 as_uint64;
  87         struct {
  88                 u64 vector:8;
  89                 u64 reserved1:8;
  90                 u64 masked:1;
  91                 u64 auto_eoi:1;
  92                 u64 reserved2:46;
  93         };
  94 };
  95
  96 /* Define the format of the SIMP register */
  97 union hv_synic_simp {
  98         u64 as_uint64;
  99         struct {
 100                 u64 simp_enabled:1;
 101                 u64 preserved:11;
 102                 u64 base_simp_gpa:52;
 103         };
 104 };
 105
 106 /* Define the format of the SIEFP register */
 107 union hv_synic_siefp {
 108         u64 as_uint64;
 109         struct {
 110                 u64 siefp_enabled:1;
 111                 u64 preserved:11;
 112                 u64 base_siefp_gpa:52;
 113         };
 114 };
 115
 116 /* Definitions for the monitored notification facility */
 117 union hv_monitor_trigger_group {
 118         u64 as_uint64;
 119         struct {
 120                 u32 pending;
 121                 u32 armed;
 122         };
 123 };
 124
 125 struct hv_monitor_parameter {
 126         union hv_connection_id connectionid;
 127         u16 flagnumber;
 128         u16 rsvdz;
 129 };
 130
 131 union hv_monitor_trigger_state {
 132         u32 asu32;
 133
 134         struct {
 135                 u32 group_enable:4;
 136                 u32 rsvdz:28;
 137         };
 138 };
 139
 140 /* struct hv_monitor_page Layout */
 141 /* ------------------------------------------------------ */
 142 /* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
 143 /* | 8   | TriggerGroup[0]                              | */
 144 /* | 10  | TriggerGroup[1]                              | */
 145 /* | 18  | TriggerGroup[2]                              | */
 146 /* | 20  | TriggerGroup[3]                              | */
 147 /* | 28  | Rsvd2[0]                                     | */
 148 /* | 30  | Rsvd2[1]                                     | */
 149 /* | 38  | Rsvd2[2]                                     | */
 150 /* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
 151 /* | ...                                                | */
 152 /* | 240 | Latency[0][0..3]                             | */
 153 /* | 340 | Rsvz3[0]                                     | */
 154 /* | 440 | Parameter[0][0]                              | */
 155 /* | 448 | Parameter[0][1]                              | */
 156 /* | ...                                                | */
 157 /* | 840 | Rsvd4[0]                                     | */
 158 /* ------------------------------------------------------ */
 159 struct hv_monitor_page {
 160         union hv_monitor_trigger_state trigger_state;
 161         u32 rsvdz1;
 162
 163         union hv_monitor_trigger_group trigger_group[4];
 164         u64 rsvdz2[3];
 165
 166         s32 next_checktime[4][32];
 167
 168         u16 latency[4][32];
 169         u64 rsvdz3[32];
 170
 171         struct hv_monitor_parameter parameter[4][32];
 172
 173         u8 rsvdz4[1984];
 174 };
 175
 176 #define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
 177
 178 /* Definition of the hv_post_message hypercall input structure. */
 179 struct hv_input_post_message {
 180         union hv_connection_id connectionid;
 181         u32 reserved;
 182         u32 message_type;
 183         u32 payload_size;
 184         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 185 };
 186
 187
 188 enum {
 189         VMBUS_MESSAGE_CONNECTION_ID     = 1,
 190         VMBUS_MESSAGE_CONNECTION_ID_4   = 4,
 191         VMBUS_MESSAGE_PORT_ID           = 1,
 192         VMBUS_EVENT_CONNECTION_ID       = 2,
 193         VMBUS_EVENT_PORT_ID             = 2,
 194         VMBUS_MONITOR_CONNECTION_ID     = 3,
 195         VMBUS_MONITOR_PORT_ID           = 3,
 196         VMBUS_MESSAGE_SINT              = 2,
 197 };
 198
 199 /*
 200  * Per cpu state for channel handling
 201  */
 202 struct hv_per_cpu_context {
 203         void *synic_message_page;
 204         void *synic_event_page;
 205         /*
 206          * buffer to post messages to the host.
 207          */
 208         void *post_msg_page;
 209
 210         /*
 211          * Starting with win8, we can take channel interrupts on any CPU;
 212          * we will manage the tasklet that handles events messages on a per CPU
 213          * basis.
 214          */
 215         struct tasklet_struct msg_dpc;
 216
 217         /*
 218          * To optimize the mapping of relid to channel, maintain
 219          * per-cpu list of the channels based on their CPU affinity.
 220          */
 221         struct list_head chan_list;
 222         struct clock_event_device *clk_evt;
 223 };
 224
 225 struct hv_context {
 226         /* We only support running on top of Hyper-V
 227          * So at this point this really can only contain the Hyper-V ID
 228          */
 229         u64 guestid;
 230
 231         void *tsc_page;
 232
 233         bool synic_initialized;
 234
 235         struct hv_per_cpu_context __percpu *cpu_context;
 236
 237         /*
 238          * To manage allocations in a NUMA node.
 239          * Array indexed by numa node ID.
 240          */
 241         struct cpumask *hv_numa_map;
 242 };
 243
 244 extern struct hv_context hv_context;
 245
 246 /* Hv Interface */
 247
 248 extern int hv_init(void);
 249
 250 extern int hv_post_message(union hv_connection_id connection_id,
 251                          enum hv_message_type message_type,
 252                          void *payload, size_t payload_size);
 253
 254 extern int hv_synic_alloc(void);
 255
 256 extern void hv_synic_free(void);
 257
 258 extern int hv_synic_init(unsigned int cpu);
 259
 260 extern int hv_synic_cleanup(unsigned int cpu);
 261
 262 extern void hv_synic_clockevents_cleanup(void);
 263
 264 /* Interface */
 265
 266
 267 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
 268                        struct page *pages, u32 pagecnt);
 269
 270 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
 271
 272 int hv_ringbuffer_write(struct vmbus_channel *channel,
 273                         const struct kvec *kv_list, u32 kv_count);
 274
 275 int hv_ringbuffer_read(struct vmbus_channel *channel,
 276                        void *buffer, u32 buflen, u32 *buffer_actual_len,
 277                        u64 *requestid, bool raw);
 278
 279 /*
 280  * Maximum channels is determined by the size of the interrupt page
 281  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
 282  * and the other is receive endpoint interrupt
 283  */
 284 #define MAX_NUM_CHANNELS        ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
 285
 286 /* The value here must be in multiple of 32 */
 287 /* TODO: Need to make this configurable */
 288 #define MAX_NUM_CHANNELS_SUPPORTED      256
 289
 290
 291 enum vmbus_connect_state {
 292         DISCONNECTED,
 293         CONNECTING,
 294         CONNECTED,
 295         DISCONNECTING
 296 };
 297
 298 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
 299
 300 struct vmbus_connection {
 301         /*
 302          * CPU on which the initial host contact was made.
 303          */
 304         int connect_cpu;
 305
 306         u32 msg_conn_id;
 307
 308         atomic_t offer_in_progress;
 309
 310         enum vmbus_connect_state conn_state;
 311
 312         atomic_t next_gpadl_handle;
 313
 314         struct completion  unload_event;
 315         /*
 316          * Represents channel interrupts. Each bit position represents a
 317          * channel.  When a channel sends an interrupt via VMBUS, it finds its
 318          * bit in the sendInterruptPage, set it and calls Hv to generate a port
 319          * event. The other end receives the port event and parse the
 320          * recvInterruptPage to see which bit is set
 321          */
 322         void *int_page;
 323         void *send_int_page;
 324         void *recv_int_page;
 325
 326         /*
 327          * 2 pages - 1st page for parent->child notification and 2nd
 328          * is child->parent notification
 329          */
 330         struct hv_monitor_page *monitor_pages[2];
 331         struct list_head chn_msg_list;
 332         spinlock_t channelmsg_lock;
 333
 334         /* List of channels */
 335         struct list_head chn_list;
 336         struct mutex channel_mutex;
 337
 338         struct workqueue_struct *work_queue;
 339 };
 340
 341
 342 struct vmbus_msginfo {
 343         /* Bookkeeping stuff */
 344         struct list_head msglist_entry;
 345
 346         /* The message itself */
 347         unsigned char msg[0];
 348 };
 349
 350
 351 extern struct vmbus_connection vmbus_connection;
 352
 353 static inline void vmbus_send_interrupt(u32 relid)
 354 {
 355         sync_set_bit(relid, vmbus_connection.send_int_page);
 356 }
 357
 358 enum vmbus_message_handler_type {
 359         /* The related handler can sleep. */
 360         VMHT_BLOCKING = 0,
 361
 362         /* The related handler must NOT sleep. */
 363         VMHT_NON_BLOCKING = 1,
 364 };
 365
 366 struct vmbus_channel_message_table_entry {
 367         enum vmbus_channel_message_type message_type;
 368         enum vmbus_message_handler_type handler_type;
 369         void (*message_handler)(struct vmbus_channel_message_header *msg);
 370 };
 371
 372 extern const struct vmbus_channel_message_table_entry
 373         channel_message_table[CHANNELMSG_COUNT];
 374
 375
 376 /* General vmbus interface */
 377
 378 struct hv_device *vmbus_device_create(const uuid_le *type,
 379                                       const uuid_le *instance,
 380                                       struct vmbus_channel *channel);
 381
 382 int vmbus_device_register(struct hv_device *child_device_obj);
 383 void vmbus_device_unregister(struct hv_device *device_obj);
 384 int vmbus_add_channel_kobj(struct hv_device *device_obj,
 385                            struct vmbus_channel *channel);
 386
 387 struct vmbus_channel *relid2channel(u32 relid);
 388
 389 void vmbus_free_channels(void);
 390
 391 /* Connection interface */
 392
 393 int vmbus_connect(void);
 394 void vmbus_disconnect(void);
 395
 396 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
 397
 398 void vmbus_on_event(unsigned long data);
 399 void vmbus_on_msg_dpc(unsigned long data);
 400
 401 int hv_kvp_init(struct hv_util_service *srv);
 402 void hv_kvp_deinit(void);
 403 void hv_kvp_onchannelcallback(void *context);
 404
 405 int hv_vss_init(struct hv_util_service *srv);
 406 void hv_vss_deinit(void);
 407 void hv_vss_onchannelcallback(void *context);
 408
 409 int hv_fcopy_init(struct hv_util_service *srv);
 410 void hv_fcopy_deinit(void);
 411 void hv_fcopy_onchannelcallback(void *context);
 412 void vmbus_initiate_unload(bool crash);
 413
 414 static inline void hv_poll_channel(struct vmbus_channel *channel,
 415                                    void (*cb)(void *))
 416 {
 417         if (!channel)
 418                 return;
 419
 420         if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
 421                 cb(channel);
 422                 return;
 423         }
 424         smp_call_function_single(channel->target_cpu, cb, channel, true);
 425 }
 426
 427 enum hvutil_device_state {
 428         HVUTIL_DEVICE_INIT = 0,  /* driver is loaded, waiting for userspace */
 429         HVUTIL_READY,            /* userspace is registered */
 430         HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
 431         HVUTIL_USERSPACE_REQ,    /* request to userspace was sent */
 432         HVUTIL_USERSPACE_RECV,   /* reply from userspace was received */
 433         HVUTIL_DEVICE_DYING,     /* driver unload is in progress */
 434 };
 435
 436 #endif /* _HYPERV_VMBUS_H */