pandora: defconfig: update
[pandora-kernel.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 #include "hv_kvp.h"
32
33
34 static void shutdown_onchannelcallback(void *context);
35 static struct hv_util_service util_shutdown = {
36         .util_cb = shutdown_onchannelcallback,
37 };
38
39 static void timesync_onchannelcallback(void *context);
40 static struct hv_util_service util_timesynch = {
41         .util_cb = timesync_onchannelcallback,
42 };
43
44 static void heartbeat_onchannelcallback(void *context);
45 static struct hv_util_service util_heartbeat = {
46         .util_cb = heartbeat_onchannelcallback,
47 };
48
49 static struct hv_util_service util_kvp = {
50         .util_cb = hv_kvp_onchannelcallback,
51         .util_init = hv_kvp_init,
52         .util_deinit = hv_kvp_deinit,
53 };
54
55 static void shutdown_onchannelcallback(void *context)
56 {
57         struct vmbus_channel *channel = context;
58         u32 recvlen;
59         u64 requestid;
60         u8  execute_shutdown = false;
61         u8  *shut_txf_buf = util_shutdown.recv_buffer;
62
63         struct shutdown_msg_data *shutdown_msg;
64
65         struct icmsg_hdr *icmsghdrp;
66         struct icmsg_negotiate *negop = NULL;
67
68         vmbus_recvpacket(channel, shut_txf_buf,
69                          PAGE_SIZE, &recvlen, &requestid);
70
71         if (recvlen > 0) {
72                 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
73                         sizeof(struct vmbuspipe_hdr)];
74
75                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
76                         vmbus_prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf);
77                 } else {
78                         shutdown_msg =
79                                 (struct shutdown_msg_data *)&shut_txf_buf[
80                                         sizeof(struct vmbuspipe_hdr) +
81                                         sizeof(struct icmsg_hdr)];
82
83                         switch (shutdown_msg->flags) {
84                         case 0:
85                         case 1:
86                                 icmsghdrp->status = HV_S_OK;
87                                 execute_shutdown = true;
88
89                                 pr_info("Shutdown request received -"
90                                             " graceful shutdown initiated\n");
91                                 break;
92                         default:
93                                 icmsghdrp->status = HV_E_FAIL;
94                                 execute_shutdown = false;
95
96                                 pr_info("Shutdown request received -"
97                                             " Invalid request\n");
98                                 break;
99                         }
100                 }
101
102                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
103                         | ICMSGHDRFLAG_RESPONSE;
104
105                 vmbus_sendpacket(channel, shut_txf_buf,
106                                        recvlen, requestid,
107                                        VM_PKT_DATA_INBAND, 0);
108         }
109
110         if (execute_shutdown == true)
111                 orderly_poweroff(true);
112 }
113
114 /*
115  * Set guest time to host UTC time.
116  */
117 static inline void do_adj_guesttime(u64 hosttime)
118 {
119         s64 host_tns;
120         struct timespec host_ts;
121
122         host_tns = (hosttime - WLTIMEDELTA) * 100;
123         host_ts = ns_to_timespec(host_tns);
124
125         do_settimeofday(&host_ts);
126 }
127
128 /*
129  * Set the host time in a process context.
130  */
131
132 struct adj_time_work {
133         struct work_struct work;
134         u64     host_time;
135 };
136
137 static void hv_set_host_time(struct work_struct *work)
138 {
139         struct adj_time_work    *wrk;
140
141         wrk = container_of(work, struct adj_time_work, work);
142         do_adj_guesttime(wrk->host_time);
143         kfree(wrk);
144 }
145
146 /*
147  * Synchronize time with host after reboot, restore, etc.
148  *
149  * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
150  * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
151  * message after the timesync channel is opened. Since the hv_utils module is
152  * loaded after hv_vmbus, the first message is usually missed. The other
153  * thing is, systime is automatically set to emulated hardware clock which may
154  * not be UTC time or in the same time zone. So, to override these effects, we
155  * use the first 50 time samples for initial system time setting.
156  */
157 static inline void adj_guesttime(u64 hosttime, u8 flags)
158 {
159         struct adj_time_work    *wrk;
160         static s32 scnt = 50;
161
162         wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
163         if (wrk == NULL)
164                 return;
165
166         wrk->host_time = hosttime;
167         if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
168                 INIT_WORK(&wrk->work, hv_set_host_time);
169                 schedule_work(&wrk->work);
170                 return;
171         }
172
173         if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
174                 scnt--;
175                 INIT_WORK(&wrk->work, hv_set_host_time);
176                 schedule_work(&wrk->work);
177         } else
178                 kfree(wrk);
179 }
180
181 /*
182  * Time Sync Channel message handler.
183  */
184 static void timesync_onchannelcallback(void *context)
185 {
186         struct vmbus_channel *channel = context;
187         u32 recvlen;
188         u64 requestid;
189         struct icmsg_hdr *icmsghdrp;
190         struct ictimesync_data *timedatap;
191         u8 *time_txf_buf = util_timesynch.recv_buffer;
192
193         vmbus_recvpacket(channel, time_txf_buf,
194                          PAGE_SIZE, &recvlen, &requestid);
195
196         if (recvlen > 0) {
197                 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
198                                 sizeof(struct vmbuspipe_hdr)];
199
200                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
201                         vmbus_prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf);
202                 } else {
203                         timedatap = (struct ictimesync_data *)&time_txf_buf[
204                                 sizeof(struct vmbuspipe_hdr) +
205                                 sizeof(struct icmsg_hdr)];
206                         adj_guesttime(timedatap->parenttime, timedatap->flags);
207                 }
208
209                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
210                         | ICMSGHDRFLAG_RESPONSE;
211
212                 vmbus_sendpacket(channel, time_txf_buf,
213                                 recvlen, requestid,
214                                 VM_PKT_DATA_INBAND, 0);
215         }
216 }
217
218 /*
219  * Heartbeat functionality.
220  * Every two seconds, Hyper-V send us a heartbeat request message.
221  * we respond to this message, and Hyper-V knows we are alive.
222  */
223 static void heartbeat_onchannelcallback(void *context)
224 {
225         struct vmbus_channel *channel = context;
226         u32 recvlen;
227         u64 requestid;
228         struct icmsg_hdr *icmsghdrp;
229         struct heartbeat_msg_data *heartbeat_msg;
230         u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
231
232         while (1) {
233
234                 vmbus_recvpacket(channel, hbeat_txf_buf,
235                                  PAGE_SIZE, &recvlen, &requestid);
236
237                 if (!recvlen)
238                         break;
239
240                 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
241                                 sizeof(struct vmbuspipe_hdr)];
242
243                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
244                         vmbus_prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf);
245                 } else {
246                         heartbeat_msg =
247                                 (struct heartbeat_msg_data *)&hbeat_txf_buf[
248                                         sizeof(struct vmbuspipe_hdr) +
249                                         sizeof(struct icmsg_hdr)];
250
251                         heartbeat_msg->seq_num += 1;
252                 }
253
254                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
255                         | ICMSGHDRFLAG_RESPONSE;
256
257                 vmbus_sendpacket(channel, hbeat_txf_buf,
258                                        recvlen, requestid,
259                                        VM_PKT_DATA_INBAND, 0);
260         }
261 }
262
263 static int util_probe(struct hv_device *dev,
264                         const struct hv_vmbus_device_id *dev_id)
265 {
266         struct hv_util_service *srv =
267                 (struct hv_util_service *)dev_id->driver_data;
268         int ret;
269
270         srv->recv_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
271         if (!srv->recv_buffer)
272                 return -ENOMEM;
273         if (srv->util_init) {
274                 ret = srv->util_init(srv);
275                 if (ret) {
276                         ret = -ENODEV;
277                         goto error1;
278                 }
279         }
280
281         ret = vmbus_open(dev->channel, 2 * PAGE_SIZE, 2 * PAGE_SIZE, NULL, 0,
282                         srv->util_cb, dev->channel);
283         if (ret)
284                 goto error;
285
286         hv_set_drvdata(dev, srv);
287         return 0;
288
289 error:
290         if (srv->util_deinit)
291                 srv->util_deinit();
292 error1:
293         kfree(srv->recv_buffer);
294         return ret;
295 }
296
297 static int util_remove(struct hv_device *dev)
298 {
299         struct hv_util_service *srv = hv_get_drvdata(dev);
300
301         vmbus_close(dev->channel);
302         if (srv->util_deinit)
303                 srv->util_deinit();
304         kfree(srv->recv_buffer);
305
306         return 0;
307 }
308
309 static const struct hv_vmbus_device_id id_table[] = {
310         /* Shutdown guid */
311         { VMBUS_DEVICE(0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
312                        0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB)
313           .driver_data = (unsigned long)&util_shutdown },
314         /* Time synch guid */
315         { VMBUS_DEVICE(0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
316                        0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
317           .driver_data = (unsigned long)&util_timesynch },
318         /* Heartbeat guid */
319         { VMBUS_DEVICE(0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
320                        0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
321           .driver_data = (unsigned long)&util_heartbeat },
322         /* KVP guid */
323         { VMBUS_DEVICE(0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
324                        0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6)
325           .driver_data = (unsigned long)&util_kvp },
326         { },
327 };
328
329 MODULE_DEVICE_TABLE(vmbus, id_table);
330
331 /* The one and only one */
332 static  struct hv_driver util_drv = {
333         .name = "hv_util",
334         .id_table = id_table,
335         .probe =  util_probe,
336         .remove =  util_remove,
337 };
338
339 static int __init init_hyperv_utils(void)
340 {
341         pr_info("Registering HyperV Utility Driver\n");
342
343         return vmbus_driver_register(&util_drv);
344 }
345
346 static void exit_hyperv_utils(void)
347 {
348         pr_info("De-Registered HyperV Utility Driver\n");
349
350         vmbus_driver_unregister(&util_drv);
351 }
352
353 module_init(init_hyperv_utils);
354 module_exit(exit_hyperv_utils);
355
356 MODULE_DESCRIPTION("Hyper-V Utilities");
357 MODULE_VERSION(HV_DRV_VERSION);
358 MODULE_LICENSE("GPL");