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