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c88c4e4c HJ |
1 | /* |
2 | * Copyright (c) 2010, Microsoft Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
20 | */ | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/sysctl.h> | |
9e629075 | 26 | #include <linux/reboot.h> |
c88c4e4c HJ |
27 | |
28 | #include "logging.h" | |
29 | #include "osd.h" | |
30 | #include "vmbus.h" | |
f8e5add2 | 31 | #include "vmbus_packet_format.h" |
0e0ab5f5 | 32 | #include "vmbus_channel_interface.h" |
2d82f6c7 | 33 | #include "version_info.h" |
4df90be5 | 34 | #include "channel.h" |
72daf320 | 35 | #include "vmbus_private.h" |
447fc67e | 36 | #include "vmbus_api.h" |
c88c4e4c HJ |
37 | #include "utils.h" |
38 | ||
39 | ||
6610944a | 40 | static void shutdown_onchannelcallback(void *context) |
c88c4e4c HJ |
41 | { |
42 | struct vmbus_channel *channel = context; | |
43 | u8 *buf; | |
44 | u32 buflen, recvlen; | |
45 | u64 requestid; | |
46 | u8 execute_shutdown = false; | |
47 | ||
48 | struct shutdown_msg_data *shutdown_msg; | |
49 | ||
50 | struct icmsg_hdr *icmsghdrp; | |
51 | struct icmsg_negotiate *negop = NULL; | |
52 | ||
53 | DPRINT_ENTER(VMBUS); | |
54 | ||
55 | buflen = PAGE_SIZE; | |
56 | buf = kmalloc(buflen, GFP_ATOMIC); | |
57 | ||
58 | VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid); | |
59 | ||
60 | if (recvlen > 0) { | |
61 | DPRINT_DBG(VMBUS, "shutdown packet: len=%d, requestid=%lld", | |
62 | recvlen, requestid); | |
63 | ||
64 | icmsghdrp = (struct icmsg_hdr *)&buf[ | |
65 | sizeof(struct vmbuspipe_hdr)]; | |
66 | ||
67 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
68 | prep_negotiate_resp(icmsghdrp, negop, buf); | |
69 | } else { | |
70 | shutdown_msg = (struct shutdown_msg_data *)&buf[ | |
71 | sizeof(struct vmbuspipe_hdr) + | |
72 | sizeof(struct icmsg_hdr)]; | |
73 | ||
74 | switch (shutdown_msg->flags) { | |
75 | case 0: | |
76 | case 1: | |
77 | icmsghdrp->status = HV_S_OK; | |
78 | execute_shutdown = true; | |
79 | ||
80 | DPRINT_INFO(VMBUS, "Shutdown request received -" | |
81 | " gracefull shutdown initiated"); | |
82 | break; | |
83 | default: | |
84 | icmsghdrp->status = HV_E_FAIL; | |
85 | execute_shutdown = false; | |
86 | ||
87 | DPRINT_INFO(VMBUS, "Shutdown request received -" | |
88 | " Invalid request"); | |
89 | break; | |
90 | }; | |
91 | } | |
92 | ||
93 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | |
94 | | ICMSGHDRFLAG_RESPONSE; | |
95 | ||
96 | VmbusChannelSendPacket(channel, buf, | |
97 | recvlen, requestid, | |
98 | VmbusPacketTypeDataInBand, 0); | |
99 | } | |
100 | ||
101 | kfree(buf); | |
102 | ||
103 | DPRINT_EXIT(VMBUS); | |
104 | ||
105 | if (execute_shutdown == true) | |
9e629075 | 106 | orderly_poweroff(false); |
c88c4e4c HJ |
107 | } |
108 | ||
39c4e9c3 | 109 | /* |
e9ec3603 | 110 | * Set guest time to host UTC time. |
39c4e9c3 | 111 | */ |
e9ec3603 | 112 | static inline void do_adj_guesttime(u64 hosttime) |
39c4e9c3 HZ |
113 | { |
114 | s64 host_tns; | |
115 | struct timespec host_ts; | |
39c4e9c3 HZ |
116 | |
117 | host_tns = (hosttime - WLTIMEDELTA) * 100; | |
118 | host_ts = ns_to_timespec(host_tns); | |
119 | ||
e9ec3603 HZ |
120 | do_settimeofday(&host_ts); |
121 | } | |
122 | ||
123 | /* | |
124 | * Synchronize time with host after reboot, restore, etc. | |
125 | * | |
126 | * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM. | |
127 | * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time | |
128 | * message after the timesync channel is opened. Since the hv_utils module is | |
129 | * loaded after hv_vmbus, the first message is usually missed. The other | |
130 | * thing is, systime is automatically set to emulated hardware clock which may | |
131 | * not be UTC time or in the same time zone. So, to override these effects, we | |
132 | * use the first 50 time samples for initial system time setting. | |
133 | */ | |
134 | static inline void adj_guesttime(u64 hosttime, u8 flags) | |
135 | { | |
136 | static s32 scnt = 50; | |
137 | ||
39c4e9c3 | 138 | if ((flags & ICTIMESYNCFLAG_SYNC) != 0) { |
e9ec3603 | 139 | do_adj_guesttime(hosttime); |
39c4e9c3 HZ |
140 | return; |
141 | } | |
142 | ||
e9ec3603 | 143 | if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) { |
39c4e9c3 | 144 | scnt--; |
e9ec3603 | 145 | do_adj_guesttime(hosttime); |
39c4e9c3 | 146 | } |
39c4e9c3 HZ |
147 | } |
148 | ||
149 | /* | |
150 | * Time Sync Channel message handler. | |
151 | */ | |
152 | static void timesync_onchannelcallback(void *context) | |
153 | { | |
154 | struct vmbus_channel *channel = context; | |
155 | u8 *buf; | |
156 | u32 buflen, recvlen; | |
157 | u64 requestid; | |
158 | struct icmsg_hdr *icmsghdrp; | |
159 | struct ictimesync_data *timedatap; | |
160 | ||
161 | DPRINT_ENTER(VMBUS); | |
162 | ||
163 | buflen = PAGE_SIZE; | |
164 | buf = kmalloc(buflen, GFP_ATOMIC); | |
165 | ||
166 | VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid); | |
167 | ||
168 | if (recvlen > 0) { | |
169 | DPRINT_DBG(VMBUS, "timesync packet: recvlen=%d, requestid=%lld", | |
170 | recvlen, requestid); | |
171 | ||
172 | icmsghdrp = (struct icmsg_hdr *)&buf[ | |
173 | sizeof(struct vmbuspipe_hdr)]; | |
174 | ||
175 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
176 | prep_negotiate_resp(icmsghdrp, NULL, buf); | |
177 | } else { | |
178 | timedatap = (struct ictimesync_data *)&buf[ | |
179 | sizeof(struct vmbuspipe_hdr) + | |
180 | sizeof(struct icmsg_hdr)]; | |
181 | adj_guesttime(timedatap->parenttime, timedatap->flags); | |
182 | } | |
183 | ||
184 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | |
185 | | ICMSGHDRFLAG_RESPONSE; | |
186 | ||
187 | VmbusChannelSendPacket(channel, buf, | |
188 | recvlen, requestid, | |
189 | VmbusPacketTypeDataInBand, 0); | |
190 | } | |
191 | ||
192 | kfree(buf); | |
193 | ||
194 | DPRINT_EXIT(VMBUS); | |
195 | } | |
196 | ||
9153f7b9 HJ |
197 | /* |
198 | * Heartbeat functionality. | |
199 | * Every two seconds, Hyper-V send us a heartbeat request message. | |
200 | * we respond to this message, and Hyper-V knows we are alive. | |
201 | */ | |
202 | static void heartbeat_onchannelcallback(void *context) | |
203 | { | |
204 | struct vmbus_channel *channel = context; | |
205 | u8 *buf; | |
206 | u32 buflen, recvlen; | |
207 | u64 requestid; | |
208 | struct icmsg_hdr *icmsghdrp; | |
209 | struct heartbeat_msg_data *heartbeat_msg; | |
210 | ||
211 | DPRINT_ENTER(VMBUS); | |
212 | ||
213 | buflen = PAGE_SIZE; | |
214 | buf = kmalloc(buflen, GFP_ATOMIC); | |
215 | ||
216 | VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid); | |
217 | ||
218 | if (recvlen > 0) { | |
219 | DPRINT_DBG(VMBUS, "heartbeat packet: len=%d, requestid=%lld", | |
220 | recvlen, requestid); | |
221 | ||
222 | icmsghdrp = (struct icmsg_hdr *)&buf[ | |
223 | sizeof(struct vmbuspipe_hdr)]; | |
224 | ||
225 | icmsghdrp = (struct icmsg_hdr *)&buf[ | |
226 | sizeof(struct vmbuspipe_hdr)]; | |
227 | ||
228 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
229 | prep_negotiate_resp(icmsghdrp, NULL, buf); | |
230 | } else { | |
231 | heartbeat_msg = (struct heartbeat_msg_data *)&buf[ | |
232 | sizeof(struct vmbuspipe_hdr) + | |
233 | sizeof(struct icmsg_hdr)]; | |
234 | ||
235 | DPRINT_DBG(VMBUS, "heartbeat seq = %lld", | |
236 | heartbeat_msg->seq_num); | |
237 | ||
238 | heartbeat_msg->seq_num += 1; | |
239 | } | |
240 | ||
241 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | |
242 | | ICMSGHDRFLAG_RESPONSE; | |
243 | ||
244 | VmbusChannelSendPacket(channel, buf, | |
245 | recvlen, requestid, | |
246 | VmbusPacketTypeDataInBand, 0); | |
247 | } | |
248 | ||
249 | kfree(buf); | |
250 | ||
251 | DPRINT_EXIT(VMBUS); | |
252 | } | |
39c4e9c3 | 253 | |
c88c4e4c HJ |
254 | static int __init init_hyperv_utils(void) |
255 | { | |
256 | printk(KERN_INFO "Registering HyperV Utility Driver\n"); | |
257 | ||
258 | hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback = | |
259 | &shutdown_onchannelcallback; | |
260 | hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback; | |
261 | ||
39c4e9c3 HZ |
262 | hv_cb_utils[HV_TIMESYNC_MSG].channel->OnChannelCallback = |
263 | ×ync_onchannelcallback; | |
264 | hv_cb_utils[HV_TIMESYNC_MSG].callback = ×ync_onchannelcallback; | |
265 | ||
9153f7b9 HJ |
266 | hv_cb_utils[HV_HEARTBEAT_MSG].channel->OnChannelCallback = |
267 | &heartbeat_onchannelcallback; | |
268 | hv_cb_utils[HV_HEARTBEAT_MSG].callback = &heartbeat_onchannelcallback; | |
269 | ||
c88c4e4c HJ |
270 | return 0; |
271 | } | |
272 | ||
273 | static void exit_hyperv_utils(void) | |
274 | { | |
275 | printk(KERN_INFO "De-Registered HyperV Utility Driver\n"); | |
276 | ||
277 | hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback = | |
278 | &chn_cb_negotiate; | |
279 | hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate; | |
39c4e9c3 HZ |
280 | |
281 | hv_cb_utils[HV_TIMESYNC_MSG].channel->OnChannelCallback = | |
282 | &chn_cb_negotiate; | |
283 | hv_cb_utils[HV_TIMESYNC_MSG].callback = &chn_cb_negotiate; | |
9153f7b9 HJ |
284 | |
285 | hv_cb_utils[HV_HEARTBEAT_MSG].channel->OnChannelCallback = | |
286 | &chn_cb_negotiate; | |
287 | hv_cb_utils[HV_HEARTBEAT_MSG].callback = &chn_cb_negotiate; | |
c88c4e4c HJ |
288 | } |
289 | ||
290 | module_init(init_hyperv_utils); | |
291 | module_exit(exit_hyperv_utils); | |
292 | ||
293 | MODULE_DESCRIPTION("Hyper-V Utilities"); | |
294 | MODULE_VERSION(HV_DRV_VERSION); | |
295 | MODULE_LICENSE("GPL"); |