Merge branch 'x86-hyperv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[sfrench/cifs-2.6.git] / drivers / hv / hyperv_vmbus.h
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  *
4  * Copyright (c) 2011, Microsoft Corporation.
5  *
6  * Authors:
7  *   Haiyang Zhang <haiyangz@microsoft.com>
8  *   Hank Janssen  <hjanssen@microsoft.com>
9  *   K. Y. Srinivasan <kys@microsoft.com>
10  */
11
12 #ifndef _HYPERV_VMBUS_H
13 #define _HYPERV_VMBUS_H
14
15 #include <linux/list.h>
16 #include <asm/sync_bitops.h>
17 #include <asm/hyperv-tlfs.h>
18 #include <linux/atomic.h>
19 #include <linux/hyperv.h>
20 #include <linux/interrupt.h>
21
22 #include "hv_trace.h"
23
24 /*
25  * Timeout for services such as KVP and fcopy.
26  */
27 #define HV_UTIL_TIMEOUT 30
28
29 /*
30  * Timeout for guest-host handshake for services.
31  */
32 #define HV_UTIL_NEGO_TIMEOUT 55
33
34
35 /* Definitions for the monitored notification facility */
36 union hv_monitor_trigger_group {
37         u64 as_uint64;
38         struct {
39                 u32 pending;
40                 u32 armed;
41         };
42 };
43
44 struct hv_monitor_parameter {
45         union hv_connection_id connectionid;
46         u16 flagnumber;
47         u16 rsvdz;
48 };
49
50 union hv_monitor_trigger_state {
51         u32 asu32;
52
53         struct {
54                 u32 group_enable:4;
55                 u32 rsvdz:28;
56         };
57 };
58
59 /* struct hv_monitor_page Layout */
60 /* ------------------------------------------------------ */
61 /* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
62 /* | 8   | TriggerGroup[0]                              | */
63 /* | 10  | TriggerGroup[1]                              | */
64 /* | 18  | TriggerGroup[2]                              | */
65 /* | 20  | TriggerGroup[3]                              | */
66 /* | 28  | Rsvd2[0]                                     | */
67 /* | 30  | Rsvd2[1]                                     | */
68 /* | 38  | Rsvd2[2]                                     | */
69 /* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
70 /* | ...                                                | */
71 /* | 240 | Latency[0][0..3]                             | */
72 /* | 340 | Rsvz3[0]                                     | */
73 /* | 440 | Parameter[0][0]                              | */
74 /* | 448 | Parameter[0][1]                              | */
75 /* | ...                                                | */
76 /* | 840 | Rsvd4[0]                                     | */
77 /* ------------------------------------------------------ */
78 struct hv_monitor_page {
79         union hv_monitor_trigger_state trigger_state;
80         u32 rsvdz1;
81
82         union hv_monitor_trigger_group trigger_group[4];
83         u64 rsvdz2[3];
84
85         s32 next_checktime[4][32];
86
87         u16 latency[4][32];
88         u64 rsvdz3[32];
89
90         struct hv_monitor_parameter parameter[4][32];
91
92         u8 rsvdz4[1984];
93 };
94
95 #define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
96
97 /* Definition of the hv_post_message hypercall input structure. */
98 struct hv_input_post_message {
99         union hv_connection_id connectionid;
100         u32 reserved;
101         u32 message_type;
102         u32 payload_size;
103         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
104 };
105
106
107 enum {
108         VMBUS_MESSAGE_CONNECTION_ID     = 1,
109         VMBUS_MESSAGE_CONNECTION_ID_4   = 4,
110         VMBUS_MESSAGE_PORT_ID           = 1,
111         VMBUS_EVENT_CONNECTION_ID       = 2,
112         VMBUS_EVENT_PORT_ID             = 2,
113         VMBUS_MONITOR_CONNECTION_ID     = 3,
114         VMBUS_MONITOR_PORT_ID           = 3,
115         VMBUS_MESSAGE_SINT              = 2,
116 };
117
118 /*
119  * Per cpu state for channel handling
120  */
121 struct hv_per_cpu_context {
122         void *synic_message_page;
123         void *synic_event_page;
124         /*
125          * buffer to post messages to the host.
126          */
127         void *post_msg_page;
128
129         /*
130          * Starting with win8, we can take channel interrupts on any CPU;
131          * we will manage the tasklet that handles events messages on a per CPU
132          * basis.
133          */
134         struct tasklet_struct msg_dpc;
135
136         /*
137          * To optimize the mapping of relid to channel, maintain
138          * per-cpu list of the channels based on their CPU affinity.
139          */
140         struct list_head chan_list;
141 };
142
143 struct hv_context {
144         /* We only support running on top of Hyper-V
145          * So at this point this really can only contain the Hyper-V ID
146          */
147         u64 guestid;
148
149         struct hv_per_cpu_context __percpu *cpu_context;
150
151         /*
152          * To manage allocations in a NUMA node.
153          * Array indexed by numa node ID.
154          */
155         struct cpumask *hv_numa_map;
156 };
157
158 extern struct hv_context hv_context;
159
160 /* Hv Interface */
161
162 extern int hv_init(void);
163
164 extern int hv_post_message(union hv_connection_id connection_id,
165                          enum hv_message_type message_type,
166                          void *payload, size_t payload_size);
167
168 extern int hv_synic_alloc(void);
169
170 extern void hv_synic_free(void);
171
172 extern int hv_synic_init(unsigned int cpu);
173
174 extern int hv_synic_cleanup(unsigned int cpu);
175
176 /* Interface */
177
178 void hv_ringbuffer_pre_init(struct vmbus_channel *channel);
179
180 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
181                        struct page *pages, u32 pagecnt);
182
183 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
184
185 int hv_ringbuffer_write(struct vmbus_channel *channel,
186                         const struct kvec *kv_list, u32 kv_count);
187
188 int hv_ringbuffer_read(struct vmbus_channel *channel,
189                        void *buffer, u32 buflen, u32 *buffer_actual_len,
190                        u64 *requestid, bool raw);
191
192 /*
193  * The Maximum number of channels (16348) is determined by the size of the
194  * interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to
195  * send endpoint interrupts, and the other is to receive endpoint interrupts.
196  */
197 #define MAX_NUM_CHANNELS        ((HV_HYP_PAGE_SIZE >> 1) << 3)
198
199 /* The value here must be in multiple of 32 */
200 /* TODO: Need to make this configurable */
201 #define MAX_NUM_CHANNELS_SUPPORTED      256
202
203
204 enum vmbus_connect_state {
205         DISCONNECTED,
206         CONNECTING,
207         CONNECTED,
208         DISCONNECTING
209 };
210
211 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
212
213 struct vmbus_connection {
214         /*
215          * CPU on which the initial host contact was made.
216          */
217         int connect_cpu;
218
219         u32 msg_conn_id;
220
221         atomic_t offer_in_progress;
222
223         enum vmbus_connect_state conn_state;
224
225         atomic_t next_gpadl_handle;
226
227         struct completion  unload_event;
228         /*
229          * Represents channel interrupts. Each bit position represents a
230          * channel.  When a channel sends an interrupt via VMBUS, it finds its
231          * bit in the sendInterruptPage, set it and calls Hv to generate a port
232          * event. The other end receives the port event and parse the
233          * recvInterruptPage to see which bit is set
234          */
235         void *int_page;
236         void *send_int_page;
237         void *recv_int_page;
238
239         /*
240          * 2 pages - 1st page for parent->child notification and 2nd
241          * is child->parent notification
242          */
243         struct hv_monitor_page *monitor_pages[2];
244         struct list_head chn_msg_list;
245         spinlock_t channelmsg_lock;
246
247         /* List of channels */
248         struct list_head chn_list;
249         struct mutex channel_mutex;
250
251         /*
252          * An offer message is handled first on the work_queue, and then
253          * is further handled on handle_primary_chan_wq or
254          * handle_sub_chan_wq.
255          */
256         struct workqueue_struct *work_queue;
257         struct workqueue_struct *handle_primary_chan_wq;
258         struct workqueue_struct *handle_sub_chan_wq;
259 };
260
261
262 struct vmbus_msginfo {
263         /* Bookkeeping stuff */
264         struct list_head msglist_entry;
265
266         /* The message itself */
267         unsigned char msg[0];
268 };
269
270
271 extern struct vmbus_connection vmbus_connection;
272
273 static inline void vmbus_send_interrupt(u32 relid)
274 {
275         sync_set_bit(relid, vmbus_connection.send_int_page);
276 }
277
278 enum vmbus_message_handler_type {
279         /* The related handler can sleep. */
280         VMHT_BLOCKING = 0,
281
282         /* The related handler must NOT sleep. */
283         VMHT_NON_BLOCKING = 1,
284 };
285
286 struct vmbus_channel_message_table_entry {
287         enum vmbus_channel_message_type message_type;
288         enum vmbus_message_handler_type handler_type;
289         void (*message_handler)(struct vmbus_channel_message_header *msg);
290 };
291
292 extern const struct vmbus_channel_message_table_entry
293         channel_message_table[CHANNELMSG_COUNT];
294
295
296 /* General vmbus interface */
297
298 struct hv_device *vmbus_device_create(const guid_t *type,
299                                       const guid_t *instance,
300                                       struct vmbus_channel *channel);
301
302 int vmbus_device_register(struct hv_device *child_device_obj);
303 void vmbus_device_unregister(struct hv_device *device_obj);
304 int vmbus_add_channel_kobj(struct hv_device *device_obj,
305                            struct vmbus_channel *channel);
306
307 void vmbus_remove_channel_attr_group(struct vmbus_channel *channel);
308
309 struct vmbus_channel *relid2channel(u32 relid);
310
311 void vmbus_free_channels(void);
312
313 /* Connection interface */
314
315 int vmbus_connect(void);
316 void vmbus_disconnect(void);
317
318 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
319
320 void vmbus_on_event(unsigned long data);
321 void vmbus_on_msg_dpc(unsigned long data);
322
323 int hv_kvp_init(struct hv_util_service *srv);
324 void hv_kvp_deinit(void);
325 void hv_kvp_onchannelcallback(void *context);
326
327 int hv_vss_init(struct hv_util_service *srv);
328 void hv_vss_deinit(void);
329 void hv_vss_onchannelcallback(void *context);
330
331 int hv_fcopy_init(struct hv_util_service *srv);
332 void hv_fcopy_deinit(void);
333 void hv_fcopy_onchannelcallback(void *context);
334 void vmbus_initiate_unload(bool crash);
335
336 static inline void hv_poll_channel(struct vmbus_channel *channel,
337                                    void (*cb)(void *))
338 {
339         if (!channel)
340                 return;
341
342         if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
343                 cb(channel);
344                 return;
345         }
346         smp_call_function_single(channel->target_cpu, cb, channel, true);
347 }
348
349 enum hvutil_device_state {
350         HVUTIL_DEVICE_INIT = 0,  /* driver is loaded, waiting for userspace */
351         HVUTIL_READY,            /* userspace is registered */
352         HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
353         HVUTIL_USERSPACE_REQ,    /* request to userspace was sent */
354         HVUTIL_USERSPACE_RECV,   /* reply from userspace was received */
355         HVUTIL_DEVICE_DYING,     /* driver unload is in progress */
356 };
357
358 #endif /* _HYPERV_VMBUS_H */