drivers/staging/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/dmi.h>
  30 #include <linux/pci.h>
  31
  32 #include "logging.h"
  33 #include "hv_api.h"
  34 #include "vmbus.h"
  35 #include "vmbus_packet_format.h"
  36 #include "vmbus_channel_interface.h"
  37 #include "version_info.h"
  38 #include "channel.h"
  39 #include "vmbus_private.h"
  40 #include "vmbus_api.h"
  41 #include "utils.h"
  42 #include "hv_kvp.h"
  43
  44 static u8 *shut_txf_buf;
  45 static u8 *time_txf_buf;
  46 static u8 *hbeat_txf_buf;
  47
  48 static void shutdown_onchannelcallback(void *context)
  49 {
  50         struct vmbus_channel *channel = context;
  51         u32 recvlen;
  52         u64 requestid;
  53         u8  execute_shutdown = false;
  54
  55         struct shutdown_msg_data *shutdown_msg;
  56
  57         struct icmsg_hdr *icmsghdrp;
  58         struct icmsg_negotiate *negop = NULL;
  59
  60         vmbus_recvpacket(channel, shut_txf_buf,
  61                          PAGE_SIZE, &recvlen, &requestid);
  62
  63         if (recvlen > 0) {
  64                 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
  65                         sizeof(struct vmbuspipe_hdr)];
  66
  67                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
  68                         prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf);
  69                 } else {
  70                         shutdown_msg =
  71                                 (struct shutdown_msg_data *)&shut_txf_buf[
  72                                         sizeof(struct vmbuspipe_hdr) +
  73                                         sizeof(struct icmsg_hdr)];
  74
  75                         switch (shutdown_msg->flags) {
  76                         case 0:
  77                         case 1:
  78                                 icmsghdrp->status = HV_S_OK;
  79                                 execute_shutdown = true;
  80
  81                                 pr_info("Shutdown request received -"
  82                                             " graceful shutdown initiated\n");
  83                                 break;
  84                         default:
  85                                 icmsghdrp->status = HV_E_FAIL;
  86                                 execute_shutdown = false;
  87
  88                                 pr_info("Shutdown request received -"
  89                                             " Invalid request\n");
  90                                 break;
  91                         };
  92                 }
  93
  94                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
  95                         | ICMSGHDRFLAG_RESPONSE;
  96
  97                 vmbus_sendpacket(channel, shut_txf_buf,
  98                                        recvlen, requestid,
  99                                        VM_PKT_DATA_INBAND, 0);
 100         }
 101
 102         if (execute_shutdown == true)
 103                 orderly_poweroff(false);
 104 }
 105
 106 /*
 107  * Set guest time to host UTC time.
 108  */
 109 static inline void do_adj_guesttime(u64 hosttime)
 110 {
 111         s64 host_tns;
 112         struct timespec host_ts;
 113
 114         host_tns = (hosttime - WLTIMEDELTA) * 100;
 115         host_ts = ns_to_timespec(host_tns);
 116
 117         do_settimeofday(&host_ts);
 118 }
 119
 120 /*
 121  * Synchronize time with host after reboot, restore, etc.
 122  *
 123  * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
 124  * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
 125  * message after the timesync channel is opened. Since the hv_utils module is
 126  * loaded after hv_vmbus, the first message is usually missed. The other
 127  * thing is, systime is automatically set to emulated hardware clock which may
 128  * not be UTC time or in the same time zone. So, to override these effects, we
 129  * use the first 50 time samples for initial system time setting.
 130  */
 131 static inline void adj_guesttime(u64 hosttime, u8 flags)
 132 {
 133         static s32 scnt = 50;
 134
 135         if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
 136                 do_adj_guesttime(hosttime);
 137                 return;
 138         }
 139
 140         if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
 141                 scnt--;
 142                 do_adj_guesttime(hosttime);
 143         }
 144 }
 145
 146 /*
 147  * Time Sync Channel message handler.
 148  */
 149 static void timesync_onchannelcallback(void *context)
 150 {
 151         struct vmbus_channel *channel = context;
 152         u32 recvlen;
 153         u64 requestid;
 154         struct icmsg_hdr *icmsghdrp;
 155         struct ictimesync_data *timedatap;
 156
 157         vmbus_recvpacket(channel, time_txf_buf,
 158                          PAGE_SIZE, &recvlen, &requestid);
 159
 160         if (recvlen > 0) {
 161                 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
 162                                 sizeof(struct vmbuspipe_hdr)];
 163
 164                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 165                         prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf);
 166                 } else {
 167                         timedatap = (struct ictimesync_data *)&time_txf_buf[
 168                                 sizeof(struct vmbuspipe_hdr) +
 169                                 sizeof(struct icmsg_hdr)];
 170                         adj_guesttime(timedatap->parenttime, timedatap->flags);
 171                 }
 172
 173                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 174                         | ICMSGHDRFLAG_RESPONSE;
 175
 176                 vmbus_sendpacket(channel, time_txf_buf,
 177                                 recvlen, requestid,
 178                                 VM_PKT_DATA_INBAND, 0);
 179         }
 180 }
 181
 182 /*
 183  * Heartbeat functionality.
 184  * Every two seconds, Hyper-V send us a heartbeat request message.
 185  * we respond to this message, and Hyper-V knows we are alive.
 186  */
 187 static void heartbeat_onchannelcallback(void *context)
 188 {
 189         struct vmbus_channel *channel = context;
 190         u32 recvlen;
 191         u64 requestid;
 192         struct icmsg_hdr *icmsghdrp;
 193         struct heartbeat_msg_data *heartbeat_msg;
 194
 195         vmbus_recvpacket(channel, hbeat_txf_buf,
 196                          PAGE_SIZE, &recvlen, &requestid);
 197
 198         if (recvlen > 0) {
 199                 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
 200                                 sizeof(struct vmbuspipe_hdr)];
 201
 202                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 203                         prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf);
 204                 } else {
 205                         heartbeat_msg =
 206                                 (struct heartbeat_msg_data *)&hbeat_txf_buf[
 207                                         sizeof(struct vmbuspipe_hdr) +
 208                                         sizeof(struct icmsg_hdr)];
 209
 210                         heartbeat_msg->seq_num += 1;
 211                 }
 212
 213                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 214                         | ICMSGHDRFLAG_RESPONSE;
 215
 216                 vmbus_sendpacket(channel, hbeat_txf_buf,
 217                                        recvlen, requestid,
 218                                        VM_PKT_DATA_INBAND, 0);
 219         }
 220 }
 221
 222 static const struct pci_device_id __initconst
 223 hv_utils_pci_table[] __maybe_unused = {
 224         { PCI_DEVICE(0x1414, 0x5353) }, /* Hyper-V emulated VGA controller */
 225         { 0 }
 226 };
 227 MODULE_DEVICE_TABLE(pci, hv_utils_pci_table);
 228
 229
 230 static const struct dmi_system_id __initconst
 231 hv_utils_dmi_table[] __maybe_unused  = {
 232         {
 233                 .ident = "Hyper-V",
 234                 .matches = {
 235                         DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 236                         DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
 237                         DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
 238                 },
 239         },
 240         { },
 241 };
 242 MODULE_DEVICE_TABLE(dmi, hv_utils_dmi_table);
 243
 244
 245 static int __init init_hyperv_utils(void)
 246 {
 247         pr_info("Registering HyperV Utility Driver\n");
 248
 249         if (hv_kvp_init())
 250                 return -ENODEV;
 251
 252
 253         if (!dmi_check_system(hv_utils_dmi_table))
 254                 return -ENODEV;
 255
 256         shut_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 257         time_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 258         hbeat_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 259
 260         if (!shut_txf_buf || !time_txf_buf || !hbeat_txf_buf) {
 261                 pr_info("Unable to allocate memory for receive buffer\n");
 262                 kfree(shut_txf_buf);
 263                 kfree(time_txf_buf);
 264                 kfree(hbeat_txf_buf);
 265                 return -ENOMEM;
 266         }
 267
 268         hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
 269                 &shutdown_onchannelcallback;
 270         hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
 271
 272         hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
 273                 &timesync_onchannelcallback;
 274         hv_cb_utils[HV_TIMESYNC_MSG].callback = &timesync_onchannelcallback;
 275
 276         hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
 277                 &heartbeat_onchannelcallback;
 278         hv_cb_utils[HV_HEARTBEAT_MSG].callback = &heartbeat_onchannelcallback;
 279
 280         hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback =
 281                 &hv_kvp_onchannelcallback;
 282
 283
 284
 285         return 0;
 286 }
 287
 288 static void exit_hyperv_utils(void)
 289 {
 290         pr_info("De-Registered HyperV Utility Driver\n");
 291
 292         hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
 293                 &chn_cb_negotiate;
 294         hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;
 295
 296         hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
 297                 &chn_cb_negotiate;
 298         hv_cb_utils[HV_TIMESYNC_MSG].callback = &chn_cb_negotiate;
 299
 300         hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
 301                 &chn_cb_negotiate;
 302         hv_cb_utils[HV_HEARTBEAT_MSG].callback = &chn_cb_negotiate;
 303
 304         hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback =
 305                 &chn_cb_negotiate;
 306         hv_kvp_deinit();
 307
 308         kfree(shut_txf_buf);
 309         kfree(time_txf_buf);
 310         kfree(hbeat_txf_buf);
 311 }
 312
 313 module_init(init_hyperv_utils);
 314 module_exit(exit_hyperv_utils);
 315
 316 MODULE_DESCRIPTION("Hyper-V Utilities");
 317 MODULE_VERSION(HV_DRV_VERSION);
 318 MODULE_LICENSE("GPL");