summaryrefslogtreecommitdiffstats
path: root/drivers/hv/hv_util.c
blob: 4aa3cb63fd41f4506254187608c995e22359aa28 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
/*
 * Copyright (c) 2010, Microsoft Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 * Authors:
 *   Haiyang Zhang <haiyangz@microsoft.com>
 *   Hank Janssen  <hjanssen@microsoft.com>
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/reboot.h>
#include <linux/hyperv.h>

#include "hyperv_vmbus.h"

#define SD_MAJOR	3
#define SD_MINOR	0
#define SD_VERSION	(SD_MAJOR << 16 | SD_MINOR)

#define SD_MAJOR_1	1
#define SD_VERSION_1	(SD_MAJOR_1 << 16 | SD_MINOR)

#define TS_MAJOR	4
#define TS_MINOR	0
#define TS_VERSION	(TS_MAJOR << 16 | TS_MINOR)

#define TS_MAJOR_1	1
#define TS_VERSION_1	(TS_MAJOR_1 << 16 | TS_MINOR)

#define TS_MAJOR_3	3
#define TS_VERSION_3	(TS_MAJOR_3 << 16 | TS_MINOR)

#define HB_MAJOR	3
#define HB_MINOR	0
#define HB_VERSION	(HB_MAJOR << 16 | HB_MINOR)

#define HB_MAJOR_1	1
#define HB_VERSION_1	(HB_MAJOR_1 << 16 | HB_MINOR)

static int sd_srv_version;
static int ts_srv_version;
static int hb_srv_version;
static int util_fw_version;

static void shutdown_onchannelcallback(void *context);
static struct hv_util_service util_shutdown = {
	.util_cb = shutdown_onchannelcallback,
};

static int hv_timesync_init(struct hv_util_service *srv);
static void hv_timesync_deinit(void);

static void timesync_onchannelcallback(void *context);
static struct hv_util_service util_timesynch = {
	.util_cb = timesync_onchannelcallback,
	.util_init = hv_timesync_init,
	.util_deinit = hv_timesync_deinit,
};

static void heartbeat_onchannelcallback(void *context);
static struct hv_util_service util_heartbeat = {
	.util_cb = heartbeat_onchannelcallback,
};

static struct hv_util_service util_kvp = {
	.util_cb = hv_kvp_onchannelcallback,
	.util_init = hv_kvp_init,
	.util_deinit = hv_kvp_deinit,
};

static struct hv_util_service util_vss = {
	.util_cb = hv_vss_onchannelcallback,
	.util_init = hv_vss_init,
	.util_deinit = hv_vss_deinit,
};

static struct hv_util_service util_fcopy = {
	.util_cb = hv_fcopy_onchannelcallback,
	.util_init = hv_fcopy_init,
	.util_deinit = hv_fcopy_deinit,
};

static void perform_shutdown(struct work_struct *dummy)
{
	orderly_poweroff(true);
}

/*
 * Perform the shutdown operation in a thread context.
 */
static DECLARE_WORK(shutdown_work, perform_shutdown);

static void shutdown_onchannelcallback(void *context)
{
	struct vmbus_channel *channel = context;
	u32 recvlen;
	u64 requestid;
	bool execute_shutdown = false;
	u8  *shut_txf_buf = util_shutdown.recv_buffer;

	struct shutdown_msg_data *shutdown_msg;

	struct icmsg_hdr *icmsghdrp;
	struct icmsg_negotiate *negop = NULL;

	vmbus_recvpacket(channel, shut_txf_buf,
			 PAGE_SIZE, &recvlen, &requestid);

	if (recvlen > 0) {
		icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
			sizeof(struct vmbuspipe_hdr)];

		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
			vmbus_prep_negotiate_resp(icmsghdrp, negop,
					shut_txf_buf, util_fw_version,
					sd_srv_version);
		} else {
			shutdown_msg =
				(struct shutdown_msg_data *)&shut_txf_buf[
					sizeof(struct vmbuspipe_hdr) +
					sizeof(struct icmsg_hdr)];

			switch (shutdown_msg->flags) {
			case 0:
			case 1:
				icmsghdrp->status = HV_S_OK;
				execute_shutdown = true;

				pr_info("Shutdown request received -"
					    " graceful shutdown initiated\n");
				break;
			default:
				icmsghdrp->status = HV_E_FAIL;
				execute_shutdown = false;

				pr_info("Shutdown request received -"
					    " Invalid request\n");
				break;
			}
		}

		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
			| ICMSGHDRFLAG_RESPONSE;

		vmbus_sendpacket(channel, shut_txf_buf,
				       recvlen, requestid,
				       VM_PKT_DATA_INBAND, 0);
	}

	if (execute_shutdown == true)
		schedule_work(&shutdown_work);
}

/*
 * Set the host time in a process context.
 */

struct adj_time_work {
	struct work_struct work;
	u64	host_time;
	u64	ref_time;
	u8	flags;
};

static void hv_set_host_time(struct work_struct *work)
{
	struct adj_time_work	*wrk;
	s64 host_tns;
	u64 newtime;
	struct timespec host_ts;

	wrk = container_of(work, struct adj_time_work, work);

	newtime = wrk->host_time;
	if (ts_srv_version > TS_VERSION_3) {
		/*
		 * Some latency has been introduced since Hyper-V generated
		 * its time sample. Take that latency into account before
		 * using TSC reference time sample from Hyper-V.
		 *
		 * This sample is given by TimeSync v4 and above hosts.
		 */
		u64 current_tick;

		rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick);
		newtime += (current_tick - wrk->ref_time);
	}
	host_tns = (newtime - WLTIMEDELTA) * 100;
	host_ts = ns_to_timespec(host_tns);

	do_settimeofday(&host_ts);
}

/*
 * Synchronize time with host after reboot, restore, etc.
 *
 * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
 * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
 * message after the timesync channel is opened. Since the hv_utils module is
 * loaded after hv_vmbus, the first message is usually missed. This bit is
 * considered a hard request to discipline the clock.
 *
 * ICTIMESYNCFLAG_SAMPLE bit indicates a time sample from host. This is
 * typically used as a hint to the guest. The guest is under no obligation
 * to discipline the clock.
 */
static struct adj_time_work  wrk;
static inline void adj_guesttime(u64 hosttime, u64 reftime, u8 flags)
{

	/*
	 * This check is safe since we are executing in the
	 * interrupt context and time synch messages arre always
	 * delivered on the same CPU.
	 */
	if (work_pending(&wrk.work))
		return;

	wrk.host_time = hosttime;
	wrk.ref_time = reftime;
	wrk.flags = flags;
	if ((flags & (ICTIMESYNCFLAG_SYNC | ICTIMESYNCFLAG_SAMPLE)) != 0) {
		schedule_work(&wrk.work);
	}
}

/*
 * Time Sync Channel message handler.
 */
static void timesync_onchannelcallback(void *context)
{
	struct vmbus_channel *channel = context;
	u32 recvlen;
	u64 requestid;
	struct icmsg_hdr *icmsghdrp;
	struct ictimesync_data *timedatap;
	struct ictimesync_ref_data *refdata;
	u8 *time_txf_buf = util_timesynch.recv_buffer;
	struct icmsg_negotiate *negop = NULL;

	vmbus_recvpacket(channel, time_txf_buf,
			 PAGE_SIZE, &recvlen, &requestid);

	if (recvlen > 0) {
		icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
				sizeof(struct vmbuspipe_hdr)];

		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
			vmbus_prep_negotiate_resp(icmsghdrp, negop,
						time_txf_buf,
						util_fw_version,
						ts_srv_version);
			pr_info("Using TimeSync version %d.%d\n",
				ts_srv_version >> 16, ts_srv_version & 0xFFFF);
		} else {
			if (ts_srv_version > TS_VERSION_3) {
				refdata = (struct ictimesync_ref_data *)
					&time_txf_buf[
					sizeof(struct vmbuspipe_hdr) +
					sizeof(struct icmsg_hdr)];

				adj_guesttime(refdata->parenttime,
						refdata->vmreferencetime,
						refdata->flags);
			} else {
				timedatap = (struct ictimesync_data *)
					&time_txf_buf[
					sizeof(struct vmbuspipe_hdr) +
					sizeof(struct icmsg_hdr)];
				adj_guesttime(timedatap->parenttime,
						0,
						timedatap->flags);
			}
		}

		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
			| ICMSGHDRFLAG_RESPONSE;

		vmbus_sendpacket(channel, time_txf_buf,
				recvlen, requestid,
				VM_PKT_DATA_INBAND, 0);
	}
}

/*
 * Heartbeat functionality.
 * Every two seconds, Hyper-V send us a heartbeat request message.
 * we respond to this message, and Hyper-V knows we are alive.
 */
static void heartbeat_onchannelcallback(void *context)
{
	struct vmbus_channel *channel = context;
	u32 recvlen;
	u64 requestid;
	struct icmsg_hdr *icmsghdrp;
	struct heartbeat_msg_data *heartbeat_msg;
	u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
	struct icmsg_negotiate *negop = NULL;

	vmbus_recvpacket(channel, hbeat_txf_buf,
			 PAGE_SIZE, &recvlen, &requestid);

	if (recvlen > 0) {
		icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
				sizeof(struct vmbuspipe_hdr)];

		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
			vmbus_prep_negotiate_resp(icmsghdrp, negop,
				hbeat_txf_buf, util_fw_version,
				hb_srv_version);
		} else {
			heartbeat_msg =
				(struct heartbeat_msg_data *)&hbeat_txf_buf[
					sizeof(struct vmbuspipe_hdr) +
					sizeof(struct icmsg_hdr)];

			heartbeat_msg->seq_num += 1;
		}

		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
			| ICMSGHDRFLAG_RESPONSE;

		vmbus_sendpacket(channel, hbeat_txf_buf,
				       recvlen, requestid,
				       VM_PKT_DATA_INBAND, 0);
	}
}

static int util_probe(struct hv_device *dev,
			const struct hv_vmbus_device_id *dev_id)
{
	struct hv_util_service *srv =
		(struct hv_util_service *)dev_id->driver_data;
	int ret;

	srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
	if (!srv->recv_buffer)
		return -ENOMEM;
	srv->channel = dev->channel;
	if (srv->util_init) {
		ret = srv->util_init(srv);
		if (ret) {
			ret = -ENODEV;
			goto error1;
		}
	}

	/*
	 * The set of services managed by the util driver are not performance
	 * critical and do not need batched reading. Furthermore, some services
	 * such as KVP can only handle one message from the host at a time.
	 * Turn off batched reading for all util drivers before we open the
	 * channel.
	 */

	set_channel_read_state(dev->channel, false);

	hv_set_drvdata(dev, srv);

	/*
	 * Based on the host; initialize the framework and
	 * service version numbers we will negotiate.
	 */
	switch (vmbus_proto_version) {
	case (VERSION_WS2008):
		util_fw_version = UTIL_WS2K8_FW_VERSION;
		sd_srv_version = SD_VERSION_1;
		ts_srv_version = TS_VERSION_1;
		hb_srv_version = HB_VERSION_1;
		break;
	case(VERSION_WIN10):
		util_fw_version = UTIL_FW_VERSION;
		sd_srv_version = SD_VERSION;
		ts_srv_version = TS_VERSION;
		hb_srv_version = HB_VERSION;
		break;
	default:
		util_fw_version = UTIL_FW_VERSION;
		sd_srv_version = SD_VERSION;
		ts_srv_version = TS_VERSION_3;
		hb_srv_version = HB_VERSION;
	}

	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
			srv->util_cb, dev->channel);
	if (ret)
		goto error;

	return 0;

error:
	if (srv->util_deinit)
		srv->util_deinit();
error1:
	kfree(srv->recv_buffer);
	return ret;
}

static int util_remove(struct hv_device *dev)
{
	struct hv_util_service *srv = hv_get_drvdata(dev);

	if (srv->util_deinit)
		srv->util_deinit();
	vmbus_close(dev->channel);
	kfree(srv->recv_buffer);

	return 0;
}

static const struct hv_vmbus_device_id id_table[] = {
	/* Shutdown guid */
	{ HV_SHUTDOWN_GUID,
	  .driver_data = (unsigned long)&util_shutdown
	},
	/* Time synch guid */
	{ HV_TS_GUID,
	  .driver_data = (unsigned long)&util_timesynch
	},
	/* Heartbeat guid */
	{ HV_HEART_BEAT_GUID,
	  .driver_data = (unsigned long)&util_heartbeat
	},
	/* KVP guid */
	{ HV_KVP_GUID,
	  .driver_data = (unsigned long)&util_kvp
	},
	/* VSS GUID */
	{ HV_VSS_GUID,
	  .driver_data = (unsigned long)&util_vss
	},
	/* File copy GUID */
	{ HV_FCOPY_GUID,
	  .driver_data = (unsigned long)&util_fcopy
	},
	{ },
};

MODULE_DEVICE_TABLE(vmbus, id_table);

/* The one and only one */
static  struct hv_driver util_drv = {
	.name = "hv_util",
	.id_table = id_table,
	.probe =  util_probe,
	.remove =  util_remove,
};

static int hv_timesync_init(struct hv_util_service *srv)
{
	INIT_WORK(&wrk.work, hv_set_host_time);
	return 0;
}

static void hv_timesync_deinit(void)
{
	cancel_work_sync(&wrk.work);
}

static int __init init_hyperv_utils(void)
{
	pr_info("Registering HyperV Utility Driver\n");

	return vmbus_driver_register(&util_drv);
}

static void exit_hyperv_utils(void)
{
	pr_info("De-Registered HyperV Utility Driver\n");

	vmbus_driver_unregister(&util_drv);
}

module_init(init_hyperv_utils);
module_exit(exit_hyperv_utils);

MODULE_DESCRIPTION("Hyper-V Utilities");
MODULE_LICENSE("GPL");