Merge branch 'samsung/exynos5' into next/soc2
[linux-2.6.git] / drivers / hv / hv_util.c
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
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>
28 #include <linux/reboot.h>
29 #include <linux/hyperv.h>
30
31 static void shutdown_onchannelcallback(void *context);
32 static struct hv_util_service util_shutdown = {
33         .util_cb = shutdown_onchannelcallback,
34 };
35
36 static void timesync_onchannelcallback(void *context);
37 static struct hv_util_service util_timesynch = {
38         .util_cb = timesync_onchannelcallback,
39 };
40
41 static void heartbeat_onchannelcallback(void *context);
42 static struct hv_util_service util_heartbeat = {
43         .util_cb = heartbeat_onchannelcallback,
44 };
45
46 static struct hv_util_service util_kvp = {
47         .util_cb = hv_kvp_onchannelcallback,
48         .util_init = hv_kvp_init,
49         .util_deinit = hv_kvp_deinit,
50 };
51
52 static void shutdown_onchannelcallback(void *context)
53 {
54         struct vmbus_channel *channel = context;
55         u32 recvlen;
56         u64 requestid;
57         u8  execute_shutdown = false;
58         u8  *shut_txf_buf = util_shutdown.recv_buffer;
59
60         struct shutdown_msg_data *shutdown_msg;
61
62         struct icmsg_hdr *icmsghdrp;
63         struct icmsg_negotiate *negop = NULL;
64
65         vmbus_recvpacket(channel, shut_txf_buf,
66                          PAGE_SIZE, &recvlen, &requestid);
67
68         if (recvlen > 0) {
69                 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
70                         sizeof(struct vmbuspipe_hdr)];
71
72                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
73                         vmbus_prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf);
74                 } else {
75                         shutdown_msg =
76                                 (struct shutdown_msg_data *)&shut_txf_buf[
77                                         sizeof(struct vmbuspipe_hdr) +
78                                         sizeof(struct icmsg_hdr)];
79
80                         switch (shutdown_msg->flags) {
81                         case 0:
82                         case 1:
83                                 icmsghdrp->status = HV_S_OK;
84                                 execute_shutdown = true;
85
86                                 pr_info("Shutdown request received -"
87                                             " graceful shutdown initiated\n");
88                                 break;
89                         default:
90                                 icmsghdrp->status = HV_E_FAIL;
91                                 execute_shutdown = false;
92
93                                 pr_info("Shutdown request received -"
94                                             " Invalid request\n");
95                                 break;
96                         }
97                 }
98
99                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
100                         | ICMSGHDRFLAG_RESPONSE;
101
102                 vmbus_sendpacket(channel, shut_txf_buf,
103                                        recvlen, requestid,
104                                        VM_PKT_DATA_INBAND, 0);
105         }
106
107         if (execute_shutdown == true)
108                 orderly_poweroff(true);
109 }
110
111 /*
112  * Set guest time to host UTC time.
113  */
114 static inline void do_adj_guesttime(u64 hosttime)
115 {
116         s64 host_tns;
117         struct timespec host_ts;
118
119         host_tns = (hosttime - WLTIMEDELTA) * 100;
120         host_ts = ns_to_timespec(host_tns);
121
122         do_settimeofday(&host_ts);
123 }
124
125 /*
126  * Set the host time in a process context.
127  */
128
129 struct adj_time_work {
130         struct work_struct work;
131         u64     host_time;
132 };
133
134 static void hv_set_host_time(struct work_struct *work)
135 {
136         struct adj_time_work    *wrk;
137
138         wrk = container_of(work, struct adj_time_work, work);
139         do_adj_guesttime(wrk->host_time);
140         kfree(wrk);
141 }
142
143 /*
144  * Synchronize time with host after reboot, restore, etc.
145  *
146  * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
147  * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
148  * message after the timesync channel is opened. Since the hv_utils module is
149  * loaded after hv_vmbus, the first message is usually missed. The other
150  * thing is, systime is automatically set to emulated hardware clock which may
151  * not be UTC time or in the same time zone. So, to override these effects, we
152  * use the first 50 time samples for initial system time setting.
153  */
154 static inline void adj_guesttime(u64 hosttime, u8 flags)
155 {
156         struct adj_time_work    *wrk;
157         static s32 scnt = 50;
158
159         wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
160         if (wrk == NULL)
161                 return;
162
163         wrk->host_time = hosttime;
164         if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
165                 INIT_WORK(&wrk->work, hv_set_host_time);
166                 schedule_work(&wrk->work);
167                 return;
168         }
169
170         if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
171                 scnt--;
172                 INIT_WORK(&wrk->work, hv_set_host_time);
173                 schedule_work(&wrk->work);
174         } else
175                 kfree(wrk);
176 }
177
178 /*
179  * Time Sync Channel message handler.
180  */
181 static void timesync_onchannelcallback(void *context)
182 {
183         struct vmbus_channel *channel = context;
184         u32 recvlen;
185         u64 requestid;
186         struct icmsg_hdr *icmsghdrp;
187         struct ictimesync_data *timedatap;
188         u8 *time_txf_buf = util_timesynch.recv_buffer;
189
190         vmbus_recvpacket(channel, time_txf_buf,
191                          PAGE_SIZE, &recvlen, &requestid);
192
193         if (recvlen > 0) {
194                 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
195                                 sizeof(struct vmbuspipe_hdr)];
196
197                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
198                         vmbus_prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf);
199                 } else {
200                         timedatap = (struct ictimesync_data *)&time_txf_buf[
201                                 sizeof(struct vmbuspipe_hdr) +
202                                 sizeof(struct icmsg_hdr)];
203                         adj_guesttime(timedatap->parenttime, timedatap->flags);
204                 }
205
206                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
207                         | ICMSGHDRFLAG_RESPONSE;
208
209                 vmbus_sendpacket(channel, time_txf_buf,
210                                 recvlen, requestid,
211                                 VM_PKT_DATA_INBAND, 0);
212         }
213 }
214
215 /*
216  * Heartbeat functionality.
217  * Every two seconds, Hyper-V send us a heartbeat request message.
218  * we respond to this message, and Hyper-V knows we are alive.
219  */
220 static void heartbeat_onchannelcallback(void *context)
221 {
222         struct vmbus_channel *channel = context;
223         u32 recvlen;
224         u64 requestid;
225         struct icmsg_hdr *icmsghdrp;
226         struct heartbeat_msg_data *heartbeat_msg;
227         u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
228
229         vmbus_recvpacket(channel, hbeat_txf_buf,
230                          PAGE_SIZE, &recvlen, &requestid);
231
232         if (recvlen > 0) {
233                 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
234                                 sizeof(struct vmbuspipe_hdr)];
235
236                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
237                         vmbus_prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf);
238                 } else {
239                         heartbeat_msg =
240                                 (struct heartbeat_msg_data *)&hbeat_txf_buf[
241                                         sizeof(struct vmbuspipe_hdr) +
242                                         sizeof(struct icmsg_hdr)];
243
244                         heartbeat_msg->seq_num += 1;
245                 }
246
247                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
248                         | ICMSGHDRFLAG_RESPONSE;
249
250                 vmbus_sendpacket(channel, hbeat_txf_buf,
251                                        recvlen, requestid,
252                                        VM_PKT_DATA_INBAND, 0);
253         }
254 }
255
256 static int util_probe(struct hv_device *dev,
257                         const struct hv_vmbus_device_id *dev_id)
258 {
259         struct hv_util_service *srv =
260                 (struct hv_util_service *)dev_id->driver_data;
261         int ret;
262
263         srv->recv_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
264         if (!srv->recv_buffer)
265                 return -ENOMEM;
266         if (srv->util_init) {
267                 ret = srv->util_init(srv);
268                 if (ret) {
269                         ret = -ENODEV;
270                         goto error1;
271                 }
272         }
273
274         ret = vmbus_open(dev->channel, 2 * PAGE_SIZE, 2 * PAGE_SIZE, NULL, 0,
275                         srv->util_cb, dev->channel);
276         if (ret)
277                 goto error;
278
279         hv_set_drvdata(dev, srv);
280         return 0;
281
282 error:
283         if (srv->util_deinit)
284                 srv->util_deinit();
285 error1:
286         kfree(srv->recv_buffer);
287         return ret;
288 }
289
290 static int util_remove(struct hv_device *dev)
291 {
292         struct hv_util_service *srv = hv_get_drvdata(dev);
293
294         vmbus_close(dev->channel);
295         if (srv->util_deinit)
296                 srv->util_deinit();
297         kfree(srv->recv_buffer);
298
299         return 0;
300 }
301
302 static const struct hv_vmbus_device_id id_table[] = {
303         /* Shutdown guid */
304         { VMBUS_DEVICE(0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
305                        0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB)
306           .driver_data = (unsigned long)&util_shutdown },
307         /* Time synch guid */
308         { VMBUS_DEVICE(0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
309                        0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
310           .driver_data = (unsigned long)&util_timesynch },
311         /* Heartbeat guid */
312         { VMBUS_DEVICE(0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
313                        0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
314           .driver_data = (unsigned long)&util_heartbeat },
315         /* KVP guid */
316         { VMBUS_DEVICE(0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
317                        0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6)
318           .driver_data = (unsigned long)&util_kvp },
319         { },
320 };
321
322 MODULE_DEVICE_TABLE(vmbus, id_table);
323
324 /* The one and only one */
325 static  struct hv_driver util_drv = {
326         .name = "hv_util",
327         .id_table = id_table,
328         .probe =  util_probe,
329         .remove =  util_remove,
330 };
331
332 static int __init init_hyperv_utils(void)
333 {
334         pr_info("Registering HyperV Utility Driver\n");
335
336         return vmbus_driver_register(&util_drv);
337 }
338
339 static void exit_hyperv_utils(void)
340 {
341         pr_info("De-Registered HyperV Utility Driver\n");
342
343         vmbus_driver_unregister(&util_drv);
344 }
345
346 module_init(init_hyperv_utils);
347 module_exit(exit_hyperv_utils);
348
349 MODULE_DESCRIPTION("Hyper-V Utilities");
350 MODULE_VERSION(HV_DRV_VERSION);
351 MODULE_LICENSE("GPL");