dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / hv / hv_util.c
blob41f5896224bd4723db7f87179c7466df423238a7
1 /*
2 * Copyright (c) 2010, Microsoft Corporation.
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.
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.
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.
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
31 #include "hyperv_vmbus.h"
33 #define SD_MAJOR 3
34 #define SD_MINOR 0
35 #define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)
37 #define SD_WS2008_MAJOR 1
38 #define SD_WS2008_VERSION (SD_WS2008_MAJOR << 16 | SD_MINOR)
40 #define TS_MAJOR 3
41 #define TS_MINOR 0
42 #define TS_VERSION (TS_MAJOR << 16 | TS_MINOR)
44 #define TS_WS2008_MAJOR 1
45 #define TS_WS2008_VERSION (TS_WS2008_MAJOR << 16 | TS_MINOR)
47 #define HB_MAJOR 3
48 #define HB_MINOR 0
49 #define HB_VERSION (HB_MAJOR << 16 | HB_MINOR)
51 #define HB_WS2008_MAJOR 1
52 #define HB_WS2008_VERSION (HB_WS2008_MAJOR << 16 | HB_MINOR)
54 static int sd_srv_version;
55 static int ts_srv_version;
56 static int hb_srv_version;
57 static int util_fw_version;
59 static void shutdown_onchannelcallback(void *context);
60 static struct hv_util_service util_shutdown = {
61 .util_cb = shutdown_onchannelcallback,
64 static void timesync_onchannelcallback(void *context);
65 static struct hv_util_service util_timesynch = {
66 .util_cb = timesync_onchannelcallback,
69 static void heartbeat_onchannelcallback(void *context);
70 static struct hv_util_service util_heartbeat = {
71 .util_cb = heartbeat_onchannelcallback,
74 static struct hv_util_service util_kvp = {
75 .util_cb = hv_kvp_onchannelcallback,
76 .util_init = hv_kvp_init,
77 .util_deinit = hv_kvp_deinit,
80 static struct hv_util_service util_vss = {
81 .util_cb = hv_vss_onchannelcallback,
82 .util_init = hv_vss_init,
83 .util_deinit = hv_vss_deinit,
86 static struct hv_util_service util_fcopy = {
87 .util_cb = hv_fcopy_onchannelcallback,
88 .util_init = hv_fcopy_init,
89 .util_deinit = hv_fcopy_deinit,
92 static void perform_shutdown(struct work_struct *dummy)
94 orderly_poweroff(true);
98 * Perform the shutdown operation in a thread context.
100 static DECLARE_WORK(shutdown_work, perform_shutdown);
102 static void shutdown_onchannelcallback(void *context)
104 struct vmbus_channel *channel = context;
105 u32 recvlen;
106 u64 requestid;
107 bool execute_shutdown = false;
108 u8 *shut_txf_buf = util_shutdown.recv_buffer;
110 struct shutdown_msg_data *shutdown_msg;
112 struct icmsg_hdr *icmsghdrp;
113 struct icmsg_negotiate *negop = NULL;
115 vmbus_recvpacket(channel, shut_txf_buf,
116 PAGE_SIZE, &recvlen, &requestid);
118 if (recvlen > 0) {
119 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
120 sizeof(struct vmbuspipe_hdr)];
122 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
123 vmbus_prep_negotiate_resp(icmsghdrp, negop,
124 shut_txf_buf, util_fw_version,
125 sd_srv_version);
126 } else {
127 shutdown_msg =
128 (struct shutdown_msg_data *)&shut_txf_buf[
129 sizeof(struct vmbuspipe_hdr) +
130 sizeof(struct icmsg_hdr)];
132 switch (shutdown_msg->flags) {
133 case 0:
134 case 1:
135 icmsghdrp->status = HV_S_OK;
136 execute_shutdown = true;
138 pr_info("Shutdown request received -"
139 " graceful shutdown initiated\n");
140 break;
141 default:
142 icmsghdrp->status = HV_E_FAIL;
143 execute_shutdown = false;
145 pr_info("Shutdown request received -"
146 " Invalid request\n");
147 break;
151 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
152 | ICMSGHDRFLAG_RESPONSE;
154 vmbus_sendpacket(channel, shut_txf_buf,
155 recvlen, requestid,
156 VM_PKT_DATA_INBAND, 0);
159 if (execute_shutdown == true)
160 schedule_work(&shutdown_work);
164 * Set guest time to host UTC time.
166 static inline void do_adj_guesttime(u64 hosttime)
168 s64 host_tns;
169 struct timespec host_ts;
171 host_tns = (hosttime - WLTIMEDELTA) * 100;
172 host_ts = ns_to_timespec(host_tns);
174 do_settimeofday(&host_ts);
178 * Set the host time in a process context.
181 struct adj_time_work {
182 struct work_struct work;
183 u64 host_time;
186 static void hv_set_host_time(struct work_struct *work)
188 struct adj_time_work *wrk;
190 wrk = container_of(work, struct adj_time_work, work);
191 do_adj_guesttime(wrk->host_time);
192 kfree(wrk);
196 * Synchronize time with host after reboot, restore, etc.
198 * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
199 * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
200 * message after the timesync channel is opened. Since the hv_utils module is
201 * loaded after hv_vmbus, the first message is usually missed. The other
202 * thing is, systime is automatically set to emulated hardware clock which may
203 * not be UTC time or in the same time zone. So, to override these effects, we
204 * use the first 50 time samples for initial system time setting.
206 static inline void adj_guesttime(u64 hosttime, u8 flags)
208 struct adj_time_work *wrk;
209 static s32 scnt = 50;
211 wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
212 if (wrk == NULL)
213 return;
215 wrk->host_time = hosttime;
216 if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
217 INIT_WORK(&wrk->work, hv_set_host_time);
218 schedule_work(&wrk->work);
219 return;
222 if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
223 scnt--;
224 INIT_WORK(&wrk->work, hv_set_host_time);
225 schedule_work(&wrk->work);
226 } else
227 kfree(wrk);
231 * Time Sync Channel message handler.
233 static void timesync_onchannelcallback(void *context)
235 struct vmbus_channel *channel = context;
236 u32 recvlen;
237 u64 requestid;
238 struct icmsg_hdr *icmsghdrp;
239 struct ictimesync_data *timedatap;
240 u8 *time_txf_buf = util_timesynch.recv_buffer;
241 struct icmsg_negotiate *negop = NULL;
243 vmbus_recvpacket(channel, time_txf_buf,
244 PAGE_SIZE, &recvlen, &requestid);
246 if (recvlen > 0) {
247 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
248 sizeof(struct vmbuspipe_hdr)];
250 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
251 vmbus_prep_negotiate_resp(icmsghdrp, negop,
252 time_txf_buf,
253 util_fw_version,
254 ts_srv_version);
255 } else {
256 timedatap = (struct ictimesync_data *)&time_txf_buf[
257 sizeof(struct vmbuspipe_hdr) +
258 sizeof(struct icmsg_hdr)];
259 adj_guesttime(timedatap->parenttime, timedatap->flags);
262 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
263 | ICMSGHDRFLAG_RESPONSE;
265 vmbus_sendpacket(channel, time_txf_buf,
266 recvlen, requestid,
267 VM_PKT_DATA_INBAND, 0);
272 * Heartbeat functionality.
273 * Every two seconds, Hyper-V send us a heartbeat request message.
274 * we respond to this message, and Hyper-V knows we are alive.
276 static void heartbeat_onchannelcallback(void *context)
278 struct vmbus_channel *channel = context;
279 u32 recvlen;
280 u64 requestid;
281 struct icmsg_hdr *icmsghdrp;
282 struct heartbeat_msg_data *heartbeat_msg;
283 u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
284 struct icmsg_negotiate *negop = NULL;
286 while (1) {
288 vmbus_recvpacket(channel, hbeat_txf_buf,
289 PAGE_SIZE, &recvlen, &requestid);
291 if (!recvlen)
292 break;
294 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
295 sizeof(struct vmbuspipe_hdr)];
297 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
298 vmbus_prep_negotiate_resp(icmsghdrp, negop,
299 hbeat_txf_buf, util_fw_version,
300 hb_srv_version);
301 } else {
302 heartbeat_msg =
303 (struct heartbeat_msg_data *)&hbeat_txf_buf[
304 sizeof(struct vmbuspipe_hdr) +
305 sizeof(struct icmsg_hdr)];
307 heartbeat_msg->seq_num += 1;
310 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
311 | ICMSGHDRFLAG_RESPONSE;
313 vmbus_sendpacket(channel, hbeat_txf_buf,
314 recvlen, requestid,
315 VM_PKT_DATA_INBAND, 0);
319 static int util_probe(struct hv_device *dev,
320 const struct hv_vmbus_device_id *dev_id)
322 struct hv_util_service *srv =
323 (struct hv_util_service *)dev_id->driver_data;
324 int ret;
326 srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
327 if (!srv->recv_buffer)
328 return -ENOMEM;
329 if (srv->util_init) {
330 ret = srv->util_init(srv);
331 if (ret) {
332 ret = -ENODEV;
333 goto error1;
338 * The set of services managed by the util driver are not performance
339 * critical and do not need batched reading. Furthermore, some services
340 * such as KVP can only handle one message from the host at a time.
341 * Turn off batched reading for all util drivers before we open the
342 * channel.
345 set_channel_read_state(dev->channel, false);
347 hv_set_drvdata(dev, srv);
350 * Based on the host; initialize the framework and
351 * service version numbers we will negotiate.
353 switch (vmbus_proto_version) {
354 case (VERSION_WS2008):
355 util_fw_version = UTIL_WS2K8_FW_VERSION;
356 sd_srv_version = SD_WS2008_VERSION;
357 ts_srv_version = TS_WS2008_VERSION;
358 hb_srv_version = HB_WS2008_VERSION;
359 break;
361 default:
362 util_fw_version = UTIL_FW_VERSION;
363 sd_srv_version = SD_VERSION;
364 ts_srv_version = TS_VERSION;
365 hb_srv_version = HB_VERSION;
368 ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
369 srv->util_cb, dev->channel);
370 if (ret)
371 goto error;
373 return 0;
375 error:
376 if (srv->util_deinit)
377 srv->util_deinit();
378 error1:
379 kfree(srv->recv_buffer);
380 return ret;
383 static int util_remove(struct hv_device *dev)
385 struct hv_util_service *srv = hv_get_drvdata(dev);
387 if (srv->util_deinit)
388 srv->util_deinit();
389 vmbus_close(dev->channel);
390 kfree(srv->recv_buffer);
392 return 0;
395 static const struct hv_vmbus_device_id id_table[] = {
396 /* Shutdown guid */
397 { HV_SHUTDOWN_GUID,
398 .driver_data = (unsigned long)&util_shutdown
400 /* Time synch guid */
401 { HV_TS_GUID,
402 .driver_data = (unsigned long)&util_timesynch
404 /* Heartbeat guid */
405 { HV_HEART_BEAT_GUID,
406 .driver_data = (unsigned long)&util_heartbeat
408 /* KVP guid */
409 { HV_KVP_GUID,
410 .driver_data = (unsigned long)&util_kvp
412 /* VSS GUID */
413 { HV_VSS_GUID,
414 .driver_data = (unsigned long)&util_vss
416 /* File copy GUID */
417 { HV_FCOPY_GUID,
418 .driver_data = (unsigned long)&util_fcopy
420 { },
423 MODULE_DEVICE_TABLE(vmbus, id_table);
425 /* The one and only one */
426 static struct hv_driver util_drv = {
427 .name = "hv_util",
428 .id_table = id_table,
429 .probe = util_probe,
430 .remove = util_remove,
433 static int __init init_hyperv_utils(void)
435 pr_info("Registering HyperV Utility Driver\n");
437 return vmbus_driver_register(&util_drv);
440 static void exit_hyperv_utils(void)
442 pr_info("De-Registered HyperV Utility Driver\n");
444 vmbus_driver_unregister(&util_drv);
447 module_init(init_hyperv_utils);
448 module_exit(exit_hyperv_utils);
450 MODULE_DESCRIPTION("Hyper-V Utilities");
451 MODULE_LICENSE("GPL");