3 * Copyright (c) 2011, Microsoft Corporation.
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.
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
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.
19 * Haiyang Zhang <haiyangz@microsoft.com>
20 * Hank Janssen <hjanssen@microsoft.com>
21 * K. Y. Srinivasan <kys@microsoft.com>
25 #ifndef _HYPERV_VMBUS_H
26 #define _HYPERV_VMBUS_H
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>
35 * Timeout for services such as KVP and fcopy.
37 #define HV_UTIL_TIMEOUT 30
40 * Timeout for guest-host handshake for services.
42 #define HV_UTIL_NEGO_TIMEOUT 55
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))
49 * Timer configuration register.
51 union hv_timer_config {
65 /* Define the synthetic interrupt controller event flags format. */
66 union hv_synic_event_flags {
67 unsigned long flags[HV_EVENT_FLAGS_LONG_COUNT];
70 /* Define SynIC control register. */
71 union hv_synic_scontrol {
79 /* Define synthetic interrupt source. */
91 /* Define the format of the SIMP register */
101 /* Define the format of the SIEFP register */
102 union hv_synic_siefp {
107 u64 base_siefp_gpa:52;
111 /* Definitions for the monitored notification facility */
112 union hv_monitor_trigger_group {
120 struct hv_monitor_parameter {
121 union hv_connection_id connectionid;
126 union hv_monitor_trigger_state {
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] | */
147 /* | 240 | Latency[0][0..3] | */
148 /* | 340 | Rsvz3[0] | */
149 /* | 440 | Parameter[0][0] | */
150 /* | 448 | Parameter[0][1] | */
152 /* | 840 | Rsvd4[0] | */
153 /* ------------------------------------------------------ */
154 struct hv_monitor_page {
155 union hv_monitor_trigger_state trigger_state;
158 union hv_monitor_trigger_group trigger_group[4];
161 s32 next_checktime[4][32];
166 struct hv_monitor_parameter parameter[4][32];
171 #define HV_HYPERCALL_PARAM_ALIGN sizeof(u64)
173 /* Definition of the hv_post_message hypercall input structure. */
174 struct hv_input_post_message {
175 union hv_connection_id connectionid;
179 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
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,
194 * Per cpu state for channel handling
196 struct hv_per_cpu_context {
197 void *synic_message_page;
198 void *synic_event_page;
200 * buffer to post messages to the host.
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
209 struct tasklet_struct msg_dpc;
212 * To optimize the mapping of relid to channel, maintain
213 * per-cpu list of the channels based on their CPU affinity.
215 struct list_head chan_list;
216 struct clock_event_device *clk_evt;
220 /* We only support running on top of Hyper-V
221 * So at this point this really can only contain the Hyper-V ID
227 bool synic_initialized;
229 struct hv_per_cpu_context __percpu *cpu_context;
232 * To manage allocations in a NUMA node.
233 * Array indexed by numa node ID.
235 struct cpumask *hv_numa_map;
238 extern struct hv_context hv_context;
242 extern int hv_init(void);
244 extern int hv_post_message(union hv_connection_id connection_id,
245 enum hv_message_type message_type,
246 void *payload, size_t payload_size);
248 extern int hv_synic_alloc(void);
250 extern void hv_synic_free(void);
252 extern int hv_synic_init(unsigned int cpu);
254 extern int hv_synic_cleanup(unsigned int cpu);
256 extern void hv_synic_clockevents_cleanup(void);
261 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
262 struct page *pages, u32 pagecnt);
264 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
266 int hv_ringbuffer_write(struct vmbus_channel *channel,
267 const struct kvec *kv_list, u32 kv_count);
269 int hv_ringbuffer_read(struct vmbus_channel *channel,
270 void *buffer, u32 buflen, u32 *buffer_actual_len,
271 u64 *requestid, bool raw);
274 * Maximum channels is determined by the size of the interrupt page
275 * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
276 * and the other is receive endpoint interrupt
278 #define MAX_NUM_CHANNELS ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
280 /* The value here must be in multiple of 32 */
281 /* TODO: Need to make this configurable */
282 #define MAX_NUM_CHANNELS_SUPPORTED 256
285 enum vmbus_connect_state {
292 #define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
294 struct vmbus_connection {
296 * CPU on which the initial host contact was made.
300 atomic_t offer_in_progress;
302 enum vmbus_connect_state conn_state;
304 atomic_t next_gpadl_handle;
306 struct completion unload_event;
308 * Represents channel interrupts. Each bit position represents a
309 * channel. When a channel sends an interrupt via VMBUS, it finds its
310 * bit in the sendInterruptPage, set it and calls Hv to generate a port
311 * event. The other end receives the port event and parse the
312 * recvInterruptPage to see which bit is set
319 * 2 pages - 1st page for parent->child notification and 2nd
320 * is child->parent notification
322 struct hv_monitor_page *monitor_pages[2];
323 struct list_head chn_msg_list;
324 spinlock_t channelmsg_lock;
326 /* List of channels */
327 struct list_head chn_list;
328 struct mutex channel_mutex;
330 struct workqueue_struct *work_queue;
334 struct vmbus_msginfo {
335 /* Bookkeeping stuff */
336 struct list_head msglist_entry;
338 /* The message itself */
339 unsigned char msg[0];
343 extern struct vmbus_connection vmbus_connection;
345 static inline void vmbus_send_interrupt(u32 relid)
347 sync_set_bit(relid, vmbus_connection.send_int_page);
350 enum vmbus_message_handler_type {
351 /* The related handler can sleep. */
354 /* The related handler must NOT sleep. */
355 VMHT_NON_BLOCKING = 1,
358 struct vmbus_channel_message_table_entry {
359 enum vmbus_channel_message_type message_type;
360 enum vmbus_message_handler_type handler_type;
361 void (*message_handler)(struct vmbus_channel_message_header *msg);
364 extern const struct vmbus_channel_message_table_entry
365 channel_message_table[CHANNELMSG_COUNT];
368 /* General vmbus interface */
370 struct hv_device *vmbus_device_create(const uuid_le *type,
371 const uuid_le *instance,
372 struct vmbus_channel *channel);
374 int vmbus_device_register(struct hv_device *child_device_obj);
375 void vmbus_device_unregister(struct hv_device *device_obj);
377 struct vmbus_channel *relid2channel(u32 relid);
379 void vmbus_free_channels(void);
381 /* Connection interface */
383 int vmbus_connect(void);
384 void vmbus_disconnect(void);
386 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
388 void vmbus_on_event(unsigned long data);
389 void vmbus_on_msg_dpc(unsigned long data);
391 int hv_kvp_init(struct hv_util_service *srv);
392 void hv_kvp_deinit(void);
393 void hv_kvp_onchannelcallback(void *context);
395 int hv_vss_init(struct hv_util_service *srv);
396 void hv_vss_deinit(void);
397 void hv_vss_onchannelcallback(void *context);
399 int hv_fcopy_init(struct hv_util_service *srv);
400 void hv_fcopy_deinit(void);
401 void hv_fcopy_onchannelcallback(void *context);
402 void vmbus_initiate_unload(bool crash);
404 static inline void hv_poll_channel(struct vmbus_channel *channel,
410 if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
414 smp_call_function_single(channel->target_cpu, cb, channel, true);
417 enum hvutil_device_state {
418 HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */
419 HVUTIL_READY, /* userspace is registered */
420 HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
421 HVUTIL_USERSPACE_REQ, /* request to userspace was sent */
422 HVUTIL_USERSPACE_RECV, /* reply from userspace was received */
423 HVUTIL_DEVICE_DYING, /* driver unload is in progress */
426 #endif /* _HYPERV_VMBUS_H */