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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 | */ | |
af7a5b6e HJ |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
c88c4e4c HJ |
23 | #include <linux/kernel.h> |
24 | #include <linux/init.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/sysctl.h> | |
9e629075 | 28 | #include <linux/reboot.h> |
d750785f HZ |
29 | #include <linux/dmi.h> |
30 | #include <linux/pci.h> | |
c88c4e4c | 31 | |
3f335ea2 | 32 | #include "hyperv.h" |
245ba56a | 33 | #include "hv_kvp.h" |
c88c4e4c | 34 | |
45241e50 HJ |
35 | static u8 *shut_txf_buf; |
36 | static u8 *time_txf_buf; | |
37 | static u8 *hbeat_txf_buf; | |
c88c4e4c | 38 | |
6610944a | 39 | static void shutdown_onchannelcallback(void *context) |
c88c4e4c HJ |
40 | { |
41 | struct vmbus_channel *channel = context; | |
45241e50 | 42 | u32 recvlen; |
c88c4e4c HJ |
43 | u64 requestid; |
44 | u8 execute_shutdown = false; | |
45 | ||
46 | struct shutdown_msg_data *shutdown_msg; | |
47 | ||
48 | struct icmsg_hdr *icmsghdrp; | |
49 | struct icmsg_negotiate *negop = NULL; | |
50 | ||
45241e50 HJ |
51 | vmbus_recvpacket(channel, shut_txf_buf, |
52 | PAGE_SIZE, &recvlen, &requestid); | |
c88c4e4c HJ |
53 | |
54 | if (recvlen > 0) { | |
45241e50 | 55 | icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[ |
c88c4e4c HJ |
56 | sizeof(struct vmbuspipe_hdr)]; |
57 | ||
58 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
45241e50 | 59 | prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf); |
c88c4e4c | 60 | } else { |
45241e50 HJ |
61 | shutdown_msg = |
62 | (struct shutdown_msg_data *)&shut_txf_buf[ | |
63 | sizeof(struct vmbuspipe_hdr) + | |
64 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c HJ |
65 | |
66 | switch (shutdown_msg->flags) { | |
67 | case 0: | |
68 | case 1: | |
69 | icmsghdrp->status = HV_S_OK; | |
70 | execute_shutdown = true; | |
71 | ||
af7a5b6e | 72 | pr_info("Shutdown request received -" |
32235b07 | 73 | " graceful shutdown initiated\n"); |
c88c4e4c HJ |
74 | break; |
75 | default: | |
76 | icmsghdrp->status = HV_E_FAIL; | |
77 | execute_shutdown = false; | |
78 | ||
af7a5b6e HJ |
79 | pr_info("Shutdown request received -" |
80 | " Invalid request\n"); | |
c88c4e4c | 81 | break; |
95cd17c9 | 82 | } |
c88c4e4c HJ |
83 | } |
84 | ||
85 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | |
86 | | ICMSGHDRFLAG_RESPONSE; | |
87 | ||
45241e50 | 88 | vmbus_sendpacket(channel, shut_txf_buf, |
c88c4e4c | 89 | recvlen, requestid, |
415f2287 | 90 | VM_PKT_DATA_INBAND, 0); |
c88c4e4c HJ |
91 | } |
92 | ||
c88c4e4c | 93 | if (execute_shutdown == true) |
9e629075 | 94 | orderly_poweroff(false); |
c88c4e4c HJ |
95 | } |
96 | ||
39c4e9c3 | 97 | /* |
e9ec3603 | 98 | * Set guest time to host UTC time. |
39c4e9c3 | 99 | */ |
e9ec3603 | 100 | static inline void do_adj_guesttime(u64 hosttime) |
39c4e9c3 HZ |
101 | { |
102 | s64 host_tns; | |
103 | struct timespec host_ts; | |
39c4e9c3 HZ |
104 | |
105 | host_tns = (hosttime - WLTIMEDELTA) * 100; | |
106 | host_ts = ns_to_timespec(host_tns); | |
107 | ||
e9ec3603 HZ |
108 | do_settimeofday(&host_ts); |
109 | } | |
110 | ||
111 | /* | |
112 | * Synchronize time with host after reboot, restore, etc. | |
113 | * | |
114 | * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM. | |
115 | * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time | |
116 | * message after the timesync channel is opened. Since the hv_utils module is | |
117 | * loaded after hv_vmbus, the first message is usually missed. The other | |
118 | * thing is, systime is automatically set to emulated hardware clock which may | |
119 | * not be UTC time or in the same time zone. So, to override these effects, we | |
120 | * use the first 50 time samples for initial system time setting. | |
121 | */ | |
122 | static inline void adj_guesttime(u64 hosttime, u8 flags) | |
123 | { | |
124 | static s32 scnt = 50; | |
125 | ||
39c4e9c3 | 126 | if ((flags & ICTIMESYNCFLAG_SYNC) != 0) { |
e9ec3603 | 127 | do_adj_guesttime(hosttime); |
39c4e9c3 HZ |
128 | return; |
129 | } | |
130 | ||
e9ec3603 | 131 | if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) { |
39c4e9c3 | 132 | scnt--; |
e9ec3603 | 133 | do_adj_guesttime(hosttime); |
39c4e9c3 | 134 | } |
39c4e9c3 HZ |
135 | } |
136 | ||
137 | /* | |
138 | * Time Sync Channel message handler. | |
139 | */ | |
140 | static void timesync_onchannelcallback(void *context) | |
141 | { | |
142 | struct vmbus_channel *channel = context; | |
45241e50 | 143 | u32 recvlen; |
39c4e9c3 HZ |
144 | u64 requestid; |
145 | struct icmsg_hdr *icmsghdrp; | |
146 | struct ictimesync_data *timedatap; | |
147 | ||
45241e50 HJ |
148 | vmbus_recvpacket(channel, time_txf_buf, |
149 | PAGE_SIZE, &recvlen, &requestid); | |
39c4e9c3 HZ |
150 | |
151 | if (recvlen > 0) { | |
45241e50 | 152 | icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[ |
39c4e9c3 HZ |
153 | sizeof(struct vmbuspipe_hdr)]; |
154 | ||
155 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
45241e50 | 156 | prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf); |
39c4e9c3 | 157 | } else { |
45241e50 | 158 | timedatap = (struct ictimesync_data *)&time_txf_buf[ |
39c4e9c3 HZ |
159 | sizeof(struct vmbuspipe_hdr) + |
160 | sizeof(struct icmsg_hdr)]; | |
161 | adj_guesttime(timedatap->parenttime, timedatap->flags); | |
162 | } | |
163 | ||
164 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | |
165 | | ICMSGHDRFLAG_RESPONSE; | |
166 | ||
45241e50 | 167 | vmbus_sendpacket(channel, time_txf_buf, |
39c4e9c3 | 168 | recvlen, requestid, |
415f2287 | 169 | VM_PKT_DATA_INBAND, 0); |
39c4e9c3 | 170 | } |
39c4e9c3 HZ |
171 | } |
172 | ||
9153f7b9 HJ |
173 | /* |
174 | * Heartbeat functionality. | |
175 | * Every two seconds, Hyper-V send us a heartbeat request message. | |
176 | * we respond to this message, and Hyper-V knows we are alive. | |
177 | */ | |
178 | static void heartbeat_onchannelcallback(void *context) | |
179 | { | |
180 | struct vmbus_channel *channel = context; | |
45241e50 | 181 | u32 recvlen; |
9153f7b9 HJ |
182 | u64 requestid; |
183 | struct icmsg_hdr *icmsghdrp; | |
184 | struct heartbeat_msg_data *heartbeat_msg; | |
185 | ||
45241e50 HJ |
186 | vmbus_recvpacket(channel, hbeat_txf_buf, |
187 | PAGE_SIZE, &recvlen, &requestid); | |
9153f7b9 HJ |
188 | |
189 | if (recvlen > 0) { | |
45241e50 | 190 | icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[ |
9153f7b9 HJ |
191 | sizeof(struct vmbuspipe_hdr)]; |
192 | ||
193 | if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { | |
45241e50 | 194 | prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf); |
9153f7b9 | 195 | } else { |
45241e50 HJ |
196 | heartbeat_msg = |
197 | (struct heartbeat_msg_data *)&hbeat_txf_buf[ | |
198 | sizeof(struct vmbuspipe_hdr) + | |
199 | sizeof(struct icmsg_hdr)]; | |
9153f7b9 | 200 | |
9153f7b9 HJ |
201 | heartbeat_msg->seq_num += 1; |
202 | } | |
203 | ||
204 | icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | |
205 | | ICMSGHDRFLAG_RESPONSE; | |
206 | ||
45241e50 | 207 | vmbus_sendpacket(channel, hbeat_txf_buf, |
9153f7b9 | 208 | recvlen, requestid, |
415f2287 | 209 | VM_PKT_DATA_INBAND, 0); |
9153f7b9 | 210 | } |
9153f7b9 | 211 | } |
39c4e9c3 | 212 | |
d750785f HZ |
213 | static const struct pci_device_id __initconst |
214 | hv_utils_pci_table[] __maybe_unused = { | |
215 | { PCI_DEVICE(0x1414, 0x5353) }, /* Hyper-V emulated VGA controller */ | |
216 | { 0 } | |
217 | }; | |
218 | MODULE_DEVICE_TABLE(pci, hv_utils_pci_table); | |
219 | ||
220 | ||
221 | static const struct dmi_system_id __initconst | |
222 | hv_utils_dmi_table[] __maybe_unused = { | |
223 | { | |
224 | .ident = "Hyper-V", | |
225 | .matches = { | |
226 | DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), | |
227 | DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"), | |
228 | DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"), | |
229 | }, | |
230 | }, | |
231 | { }, | |
232 | }; | |
233 | MODULE_DEVICE_TABLE(dmi, hv_utils_dmi_table); | |
234 | ||
235 | ||
c88c4e4c HJ |
236 | static int __init init_hyperv_utils(void) |
237 | { | |
af7a5b6e | 238 | pr_info("Registering HyperV Utility Driver\n"); |
c88c4e4c | 239 | |
245ba56a KS |
240 | if (hv_kvp_init()) |
241 | return -ENODEV; | |
242 | ||
243 | ||
d750785f HZ |
244 | if (!dmi_check_system(hv_utils_dmi_table)) |
245 | return -ENODEV; | |
246 | ||
45241e50 HJ |
247 | shut_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
248 | time_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
249 | hbeat_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
250 | ||
251 | if (!shut_txf_buf || !time_txf_buf || !hbeat_txf_buf) { | |
af7a5b6e | 252 | pr_info("Unable to allocate memory for receive buffer\n"); |
45241e50 HJ |
253 | kfree(shut_txf_buf); |
254 | kfree(time_txf_buf); | |
255 | kfree(hbeat_txf_buf); | |
256 | return -ENOMEM; | |
257 | } | |
258 | ||
c50f7fb2 | 259 | hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback = |
c88c4e4c HJ |
260 | &shutdown_onchannelcallback; |
261 | hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback; | |
262 | ||
c50f7fb2 | 263 | hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback = |
39c4e9c3 HZ |
264 | ×ync_onchannelcallback; |
265 | hv_cb_utils[HV_TIMESYNC_MSG].callback = ×ync_onchannelcallback; | |
266 | ||
c50f7fb2 | 267 | hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback = |
9153f7b9 HJ |
268 | &heartbeat_onchannelcallback; |
269 | hv_cb_utils[HV_HEARTBEAT_MSG].callback = &heartbeat_onchannelcallback; | |
270 | ||
245ba56a KS |
271 | hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback = |
272 | &hv_kvp_onchannelcallback; | |
273 | ||
274 | ||
275 | ||
c88c4e4c HJ |
276 | return 0; |
277 | } | |
278 | ||
279 | static void exit_hyperv_utils(void) | |
280 | { | |
af7a5b6e | 281 | pr_info("De-Registered HyperV Utility Driver\n"); |
c88c4e4c | 282 | |
c50f7fb2 | 283 | hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback = |
c88c4e4c HJ |
284 | &chn_cb_negotiate; |
285 | hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate; | |
39c4e9c3 | 286 | |
c50f7fb2 | 287 | hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback = |
39c4e9c3 HZ |
288 | &chn_cb_negotiate; |
289 | hv_cb_utils[HV_TIMESYNC_MSG].callback = &chn_cb_negotiate; | |
9153f7b9 | 290 | |
c50f7fb2 | 291 | hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback = |
9153f7b9 HJ |
292 | &chn_cb_negotiate; |
293 | hv_cb_utils[HV_HEARTBEAT_MSG].callback = &chn_cb_negotiate; | |
45241e50 | 294 | |
245ba56a KS |
295 | hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback = |
296 | &chn_cb_negotiate; | |
297 | hv_kvp_deinit(); | |
298 | ||
45241e50 HJ |
299 | kfree(shut_txf_buf); |
300 | kfree(time_txf_buf); | |
301 | kfree(hbeat_txf_buf); | |
c88c4e4c HJ |
302 | } |
303 | ||
304 | module_init(init_hyperv_utils); | |
305 | module_exit(exit_hyperv_utils); | |
306 | ||
307 | MODULE_DESCRIPTION("Hyper-V Utilities"); | |
308 | MODULE_VERSION(HV_DRV_VERSION); | |
309 | MODULE_LICENSE("GPL"); |