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