Merge branch 'rework/kthreads' into for-linus
[linux-2.6-microblaze.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 <linux/bitops.h>
17 #include <asm/sync_bitops.h>
18 #include <asm/hyperv-tlfs.h>
19 #include <linux/atomic.h>
20 #include <linux/hyperv.h>
21 #include <linux/interrupt.h>
22
23 #include "hv_trace.h"
24
25 /*
26  * Timeout for services such as KVP and fcopy.
27  */
28 #define HV_UTIL_TIMEOUT 30
29
30 /*
31  * Timeout for guest-host handshake for services.
32  */
33 #define HV_UTIL_NEGO_TIMEOUT 55
34
35
36 /* Definitions for the monitored notification facility */
37 union hv_monitor_trigger_group {
38         u64 as_uint64;
39         struct {
40                 u32 pending;
41                 u32 armed;
42         };
43 };
44
45 struct hv_monitor_parameter {
46         union hv_connection_id connectionid;
47         u16 flagnumber;
48         u16 rsvdz;
49 };
50
51 union hv_monitor_trigger_state {
52         u32 asu32;
53
54         struct {
55                 u32 group_enable:4;
56                 u32 rsvdz:28;
57         };
58 };
59
60 /* struct hv_monitor_page Layout */
61 /* ------------------------------------------------------ */
62 /* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
63 /* | 8   | TriggerGroup[0]                              | */
64 /* | 10  | TriggerGroup[1]                              | */
65 /* | 18  | TriggerGroup[2]                              | */
66 /* | 20  | TriggerGroup[3]                              | */
67 /* | 28  | Rsvd2[0]                                     | */
68 /* | 30  | Rsvd2[1]                                     | */
69 /* | 38  | Rsvd2[2]                                     | */
70 /* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
71 /* | ...                                                | */
72 /* | 240 | Latency[0][0..3]                             | */
73 /* | 340 | Rsvz3[0]                                     | */
74 /* | 440 | Parameter[0][0]                              | */
75 /* | 448 | Parameter[0][1]                              | */
76 /* | ...                                                | */
77 /* | 840 | Rsvd4[0]                                     | */
78 /* ------------------------------------------------------ */
79 struct hv_monitor_page {
80         union hv_monitor_trigger_state trigger_state;
81         u32 rsvdz1;
82
83         union hv_monitor_trigger_group trigger_group[4];
84         u64 rsvdz2[3];
85
86         s32 next_checktime[4][32];
87
88         u16 latency[4][32];
89         u64 rsvdz3[32];
90
91         struct hv_monitor_parameter parameter[4][32];
92
93         u8 rsvdz4[1984];
94 };
95
96 #define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
97
98 /* Definition of the hv_post_message hypercall input structure. */
99 struct hv_input_post_message {
100         union hv_connection_id connectionid;
101         u32 reserved;
102         u32 message_type;
103         u32 payload_size;
104         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
105 };
106
107
108 enum {
109         VMBUS_MESSAGE_CONNECTION_ID     = 1,
110         VMBUS_MESSAGE_CONNECTION_ID_4   = 4,
111         VMBUS_MESSAGE_PORT_ID           = 1,
112         VMBUS_EVENT_CONNECTION_ID       = 2,
113         VMBUS_EVENT_PORT_ID             = 2,
114         VMBUS_MONITOR_CONNECTION_ID     = 3,
115         VMBUS_MONITOR_PORT_ID           = 3,
116         VMBUS_MESSAGE_SINT              = 2,
117 };
118
119 /*
120  * Per cpu state for channel handling
121  */
122 struct hv_per_cpu_context {
123         void *synic_message_page;
124         void *synic_event_page;
125         /*
126          * buffer to post messages to the host.
127          */
128         void *post_msg_page;
129
130         /*
131          * Starting with win8, we can take channel interrupts on any CPU;
132          * we will manage the tasklet that handles events messages on a per CPU
133          * basis.
134          */
135         struct tasklet_struct msg_dpc;
136 };
137
138 struct hv_context {
139         /* We only support running on top of Hyper-V
140          * So at this point this really can only contain the Hyper-V ID
141          */
142         u64 guestid;
143
144         struct hv_per_cpu_context __percpu *cpu_context;
145
146         /*
147          * To manage allocations in a NUMA node.
148          * Array indexed by numa node ID.
149          */
150         struct cpumask *hv_numa_map;
151 };
152
153 extern struct hv_context hv_context;
154
155 /* Hv Interface */
156
157 extern int hv_init(void);
158
159 extern int hv_post_message(union hv_connection_id connection_id,
160                          enum hv_message_type message_type,
161                          void *payload, size_t payload_size);
162
163 extern int hv_synic_alloc(void);
164
165 extern void hv_synic_free(void);
166
167 extern void hv_synic_enable_regs(unsigned int cpu);
168 extern int hv_synic_init(unsigned int cpu);
169
170 extern void hv_synic_disable_regs(unsigned int cpu);
171 extern int hv_synic_cleanup(unsigned int cpu);
172
173 /* Interface */
174
175 void hv_ringbuffer_pre_init(struct vmbus_channel *channel);
176
177 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
178                        struct page *pages, u32 pagecnt, u32 max_pkt_size);
179
180 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
181
182 int hv_ringbuffer_write(struct vmbus_channel *channel,
183                         const struct kvec *kv_list, u32 kv_count,
184                         u64 requestid, u64 *trans_id);
185
186 int hv_ringbuffer_read(struct vmbus_channel *channel,
187                        void *buffer, u32 buflen, u32 *buffer_actual_len,
188                        u64 *requestid, bool raw);
189
190 /*
191  * The Maximum number of channels (16384) is determined by the size of the
192  * interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to
193  * send endpoint interrupts, and the other is to receive endpoint interrupts.
194  */
195 #define MAX_NUM_CHANNELS        ((HV_HYP_PAGE_SIZE >> 1) << 3)
196
197 /* The value here must be in multiple of 32 */
198 #define MAX_NUM_CHANNELS_SUPPORTED      256
199
200 #define MAX_CHANNEL_RELIDS                                      \
201         max(MAX_NUM_CHANNELS_SUPPORTED, HV_EVENT_FLAGS_COUNT)
202
203 enum vmbus_connect_state {
204         DISCONNECTED,
205         CONNECTING,
206         CONNECTED,
207         DISCONNECTING
208 };
209
210 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
211
212 /*
213  * The CPU that Hyper-V will interrupt for VMBUS messages, such as
214  * CHANNELMSG_OFFERCHANNEL and CHANNELMSG_RESCIND_CHANNELOFFER.
215  */
216 #define VMBUS_CONNECT_CPU       0
217
218 struct vmbus_connection {
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         void *monitor_pages_original[2];
245         phys_addr_t monitor_pages_pa[2];
246         struct list_head chn_msg_list;
247         spinlock_t channelmsg_lock;
248
249         /* List of channels */
250         struct list_head chn_list;
251         struct mutex channel_mutex;
252
253         /* Array of channels */
254         struct vmbus_channel **channels;
255
256         /*
257          * An offer message is handled first on the work_queue, and then
258          * is further handled on handle_primary_chan_wq or
259          * handle_sub_chan_wq.
260          */
261         struct workqueue_struct *work_queue;
262         struct workqueue_struct *handle_primary_chan_wq;
263         struct workqueue_struct *handle_sub_chan_wq;
264
265         /*
266          * The number of sub-channels and hv_sock channels that should be
267          * cleaned up upon suspend: sub-channels will be re-created upon
268          * resume, and hv_sock channels should not survive suspend.
269          */
270         atomic_t nr_chan_close_on_suspend;
271         /*
272          * vmbus_bus_suspend() waits for "nr_chan_close_on_suspend" to
273          * drop to zero.
274          */
275         struct completion ready_for_suspend_event;
276
277         /*
278          * The number of primary channels that should be "fixed up"
279          * upon resume: these channels are re-offered upon resume, and some
280          * fields of the channel offers (i.e. child_relid and connection_id)
281          * can change, so the old offermsg must be fixed up, before the resume
282          * callbacks of the VSC drivers start to further touch the channels.
283          */
284         atomic_t nr_chan_fixup_on_resume;
285         /*
286          * vmbus_bus_resume() waits for "nr_chan_fixup_on_resume" to
287          * drop to zero.
288          */
289         struct completion ready_for_resume_event;
290 };
291
292
293 struct vmbus_msginfo {
294         /* Bookkeeping stuff */
295         struct list_head msglist_entry;
296
297         /* The message itself */
298         unsigned char msg[];
299 };
300
301
302 extern struct vmbus_connection vmbus_connection;
303
304 int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version);
305
306 static inline void vmbus_send_interrupt(u32 relid)
307 {
308         sync_set_bit(relid, vmbus_connection.send_int_page);
309 }
310
311 enum vmbus_message_handler_type {
312         /* The related handler can sleep. */
313         VMHT_BLOCKING = 0,
314
315         /* The related handler must NOT sleep. */
316         VMHT_NON_BLOCKING = 1,
317 };
318
319 struct vmbus_channel_message_table_entry {
320         enum vmbus_channel_message_type message_type;
321         enum vmbus_message_handler_type handler_type;
322         void (*message_handler)(struct vmbus_channel_message_header *msg);
323         u32 min_payload_len;
324 };
325
326 extern const struct vmbus_channel_message_table_entry
327         channel_message_table[CHANNELMSG_COUNT];
328
329
330 /* General vmbus interface */
331
332 struct hv_device *vmbus_device_create(const guid_t *type,
333                                       const guid_t *instance,
334                                       struct vmbus_channel *channel);
335
336 int vmbus_device_register(struct hv_device *child_device_obj);
337 void vmbus_device_unregister(struct hv_device *device_obj);
338 int vmbus_add_channel_kobj(struct hv_device *device_obj,
339                            struct vmbus_channel *channel);
340
341 void vmbus_remove_channel_attr_group(struct vmbus_channel *channel);
342
343 void vmbus_channel_map_relid(struct vmbus_channel *channel);
344 void vmbus_channel_unmap_relid(struct vmbus_channel *channel);
345
346 struct vmbus_channel *relid2channel(u32 relid);
347
348 void vmbus_free_channels(void);
349
350 /* Connection interface */
351
352 int vmbus_connect(void);
353 void vmbus_disconnect(void);
354
355 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
356
357 void vmbus_on_event(unsigned long data);
358 void vmbus_on_msg_dpc(unsigned long data);
359
360 int hv_kvp_init(struct hv_util_service *srv);
361 void hv_kvp_deinit(void);
362 int hv_kvp_pre_suspend(void);
363 int hv_kvp_pre_resume(void);
364 void hv_kvp_onchannelcallback(void *context);
365
366 int hv_vss_init(struct hv_util_service *srv);
367 void hv_vss_deinit(void);
368 int hv_vss_pre_suspend(void);
369 int hv_vss_pre_resume(void);
370 void hv_vss_onchannelcallback(void *context);
371
372 int hv_fcopy_init(struct hv_util_service *srv);
373 void hv_fcopy_deinit(void);
374 int hv_fcopy_pre_suspend(void);
375 int hv_fcopy_pre_resume(void);
376 void hv_fcopy_onchannelcallback(void *context);
377 void vmbus_initiate_unload(bool crash);
378
379 static inline void hv_poll_channel(struct vmbus_channel *channel,
380                                    void (*cb)(void *))
381 {
382         if (!channel)
383                 return;
384         cb(channel);
385 }
386
387 enum hvutil_device_state {
388         HVUTIL_DEVICE_INIT = 0,  /* driver is loaded, waiting for userspace */
389         HVUTIL_READY,            /* userspace is registered */
390         HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
391         HVUTIL_USERSPACE_REQ,    /* request to userspace was sent */
392         HVUTIL_USERSPACE_RECV,   /* reply from userspace was received */
393         HVUTIL_DEVICE_DYING,     /* driver unload is in progress */
394 };
395
396 enum delay {
397         INTERRUPT_DELAY = 0,
398         MESSAGE_DELAY   = 1,
399 };
400
401 extern const struct vmbus_device vmbus_devs[];
402
403 static inline bool hv_is_perf_channel(struct vmbus_channel *channel)
404 {
405         return vmbus_devs[channel->device_id].perf_device;
406 }
407
408 static inline bool hv_is_allocated_cpu(unsigned int cpu)
409 {
410         struct vmbus_channel *channel, *sc;
411
412         lockdep_assert_held(&vmbus_connection.channel_mutex);
413         /*
414          * List additions/deletions as well as updates of the target CPUs are
415          * protected by channel_mutex.
416          */
417         list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
418                 if (!hv_is_perf_channel(channel))
419                         continue;
420                 if (channel->target_cpu == cpu)
421                         return true;
422                 list_for_each_entry(sc, &channel->sc_list, sc_list) {
423                         if (sc->target_cpu == cpu)
424                                 return true;
425                 }
426         }
427         return false;
428 }
429
430 static inline void hv_set_allocated_cpu(unsigned int cpu)
431 {
432         cpumask_set_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
433 }
434
435 static inline void hv_clear_allocated_cpu(unsigned int cpu)
436 {
437         if (hv_is_allocated_cpu(cpu))
438                 return;
439         cpumask_clear_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
440 }
441
442 static inline void hv_update_allocated_cpus(unsigned int old_cpu,
443                                           unsigned int new_cpu)
444 {
445         hv_set_allocated_cpu(new_cpu);
446         hv_clear_allocated_cpu(old_cpu);
447 }
448
449 #ifdef CONFIG_HYPERV_TESTING
450
451 int hv_debug_add_dev_dir(struct hv_device *dev);
452 void hv_debug_rm_dev_dir(struct hv_device *dev);
453 void hv_debug_rm_all_dir(void);
454 int hv_debug_init(void);
455 void hv_debug_delay_test(struct vmbus_channel *channel, enum delay delay_type);
456
457 #else /* CONFIG_HYPERV_TESTING */
458
459 static inline void hv_debug_rm_dev_dir(struct hv_device *dev) {};
460 static inline void hv_debug_rm_all_dir(void) {};
461 static inline void hv_debug_delay_test(struct vmbus_channel *channel,
462                                        enum delay delay_type) {};
463 static inline int hv_debug_init(void)
464 {
465         return -1;
466 }
467
468 static inline int hv_debug_add_dev_dir(struct hv_device *dev)
469 {
470         return -1;
471 }
472
473 #endif /* CONFIG_HYPERV_TESTING */
474
475 #endif /* _HYPERV_VMBUS_H */