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 uuid_le *type, 316 const uuid_le *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 */ 374