diff options
Diffstat (limited to 'drivers/staging/hv/hv_util.c')
-rw-r--r-- | drivers/staging/hv/hv_util.c | 354 |
1 files changed, 0 insertions, 354 deletions
diff --git a/drivers/staging/hv/hv_util.c b/drivers/staging/hv/hv_util.c deleted file mode 100644 index faa6607..0000000 --- a/drivers/staging/hv/hv_util.c +++ /dev/null @@ -1,354 +0,0 @@ -/* - * Copyright (c) 2010, Microsoft Corporation. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 59 Temple - * Place - Suite 330, Boston, MA 02111-1307 USA. - * - * Authors: - * Haiyang Zhang <haiyangz@microsoft.com> - * Hank Janssen <hjanssen@microsoft.com> - */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/sysctl.h> -#include <linux/reboot.h> - -#include "hyperv.h" -#include "hv_kvp.h" - - -static void shutdown_onchannelcallback(void *context); -static struct hv_util_service util_shutdown = { - .util_cb = shutdown_onchannelcallback, -}; - -static void timesync_onchannelcallback(void *context); -static struct hv_util_service util_timesynch = { - .util_cb = timesync_onchannelcallback, -}; - -static void heartbeat_onchannelcallback(void *context); -static struct hv_util_service util_heartbeat = { - .util_cb = heartbeat_onchannelcallback, -}; - -static struct hv_util_service util_kvp = { - .util_cb = hv_kvp_onchannelcallback, - .util_init = hv_kvp_init, - .util_deinit = hv_kvp_deinit, -}; - -static void shutdown_onchannelcallback(void *context) -{ - struct vmbus_channel *channel = context; - u32 recvlen; - u64 requestid; - u8 execute_shutdown = false; - u8 *shut_txf_buf = util_shutdown.recv_buffer; - - struct shutdown_msg_data *shutdown_msg; - - struct icmsg_hdr *icmsghdrp; - struct icmsg_negotiate *negop = NULL; - - vmbus_recvpacket(channel, shut_txf_buf, - PAGE_SIZE, &recvlen, &requestid); - - if (recvlen > 0) { - icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[ - sizeof(struct vmbuspipe_hdr)]; - - if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { - prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf); - } else { - shutdown_msg = - (struct shutdown_msg_data *)&shut_txf_buf[ - sizeof(struct vmbuspipe_hdr) + - sizeof(struct icmsg_hdr)]; - - switch (shutdown_msg->flags) { - case 0: - case 1: - icmsghdrp->status = HV_S_OK; - execute_shutdown = true; - - pr_info("Shutdown request received -" - " graceful shutdown initiated\n"); - break; - default: - icmsghdrp->status = HV_E_FAIL; - execute_shutdown = false; - - pr_info("Shutdown request received -" - " Invalid request\n"); - break; - } - } - - icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION - | ICMSGHDRFLAG_RESPONSE; - - vmbus_sendpacket(channel, shut_txf_buf, - recvlen, requestid, - VM_PKT_DATA_INBAND, 0); - } - - if (execute_shutdown == true) - orderly_poweroff(true); -} - -/* - * Set guest time to host UTC time. - */ -static inline void do_adj_guesttime(u64 hosttime) -{ - s64 host_tns; - struct timespec host_ts; - - host_tns = (hosttime - WLTIMEDELTA) * 100; - host_ts = ns_to_timespec(host_tns); - - do_settimeofday(&host_ts); -} - -/* - * Set the host time in a process context. - */ - -struct adj_time_work { - struct work_struct work; - u64 host_time; -}; - -static void hv_set_host_time(struct work_struct *work) -{ - struct adj_time_work *wrk; - - wrk = container_of(work, struct adj_time_work, work); - do_adj_guesttime(wrk->host_time); - kfree(wrk); -} - -/* - * Synchronize time with host after reboot, restore, etc. - * - * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM. - * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time - * message after the timesync channel is opened. Since the hv_utils module is - * loaded after hv_vmbus, the first message is usually missed. The other - * thing is, systime is automatically set to emulated hardware clock which may - * not be UTC time or in the same time zone. So, to override these effects, we - * use the first 50 time samples for initial system time setting. - */ -static inline void adj_guesttime(u64 hosttime, u8 flags) -{ - struct adj_time_work *wrk; - static s32 scnt = 50; - - wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC); - if (wrk == NULL) - return; - - wrk->host_time = hosttime; - if ((flags & ICTIMESYNCFLAG_SYNC) != 0) { - INIT_WORK(&wrk->work, hv_set_host_time); - schedule_work(&wrk->work); - return; - } - - if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) { - scnt--; - INIT_WORK(&wrk->work, hv_set_host_time); - schedule_work(&wrk->work); - } else - kfree(wrk); -} - -/* - * Time Sync Channel message handler. - */ -static void timesync_onchannelcallback(void *context) -{ - struct vmbus_channel *channel = context; - u32 recvlen; - u64 requestid; - struct icmsg_hdr *icmsghdrp; - struct ictimesync_data *timedatap; - u8 *time_txf_buf = util_timesynch.recv_buffer; - - vmbus_recvpacket(channel, time_txf_buf, - PAGE_SIZE, &recvlen, &requestid); - - if (recvlen > 0) { - icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[ - sizeof(struct vmbuspipe_hdr)]; - - if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { - prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf); - } else { - timedatap = (struct ictimesync_data *)&time_txf_buf[ - sizeof(struct vmbuspipe_hdr) + - sizeof(struct icmsg_hdr)]; - adj_guesttime(timedatap->parenttime, timedatap->flags); - } - - icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION - | ICMSGHDRFLAG_RESPONSE; - - vmbus_sendpacket(channel, time_txf_buf, - recvlen, requestid, - VM_PKT_DATA_INBAND, 0); - } -} - -/* - * Heartbeat functionality. - * Every two seconds, Hyper-V send us a heartbeat request message. - * we respond to this message, and Hyper-V knows we are alive. - */ -static void heartbeat_onchannelcallback(void *context) -{ - struct vmbus_channel *channel = context; - u32 recvlen; - u64 requestid; - struct icmsg_hdr *icmsghdrp; - struct heartbeat_msg_data *heartbeat_msg; - u8 *hbeat_txf_buf = util_heartbeat.recv_buffer; - - vmbus_recvpacket(channel, hbeat_txf_buf, - PAGE_SIZE, &recvlen, &requestid); - - if (recvlen > 0) { - icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[ - sizeof(struct vmbuspipe_hdr)]; - - if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { - prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf); - } else { - heartbeat_msg = - (struct heartbeat_msg_data *)&hbeat_txf_buf[ - sizeof(struct vmbuspipe_hdr) + - sizeof(struct icmsg_hdr)]; - - heartbeat_msg->seq_num += 1; - } - - icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION - | ICMSGHDRFLAG_RESPONSE; - - vmbus_sendpacket(channel, hbeat_txf_buf, - recvlen, requestid, - VM_PKT_DATA_INBAND, 0); - } -} - -static int util_probe(struct hv_device *dev, - const struct hv_vmbus_device_id *dev_id) -{ - struct hv_util_service *srv = - (struct hv_util_service *)dev_id->driver_data; - int ret; - - srv->recv_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL); - if (!srv->recv_buffer) - return -ENOMEM; - if (srv->util_init) { - ret = srv->util_init(srv); - if (ret) { - ret = -ENODEV; - goto error1; - } - } - - ret = vmbus_open(dev->channel, 2 * PAGE_SIZE, 2 * PAGE_SIZE, NULL, 0, - srv->util_cb, dev->channel); - if (ret) - goto error; - - hv_set_drvdata(dev, srv); - return 0; - -error: - if (srv->util_deinit) - srv->util_deinit(); -error1: - kfree(srv->recv_buffer); - return ret; -} - -static int util_remove(struct hv_device *dev) -{ - struct hv_util_service *srv = hv_get_drvdata(dev); - - vmbus_close(dev->channel); - if (srv->util_deinit) - srv->util_deinit(); - kfree(srv->recv_buffer); - - return 0; -} - -static const struct hv_vmbus_device_id id_table[] = { - /* Shutdown guid */ - { VMBUS_DEVICE(0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49, - 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB) - .driver_data = (unsigned long)&util_shutdown }, - /* Time synch guid */ - { VMBUS_DEVICE(0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49, - 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf) - .driver_data = (unsigned long)&util_timesynch }, - /* Heartbeat guid */ - { VMBUS_DEVICE(0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e, - 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d) - .driver_data = (unsigned long)&util_heartbeat }, - /* KVP guid */ - { VMBUS_DEVICE(0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d, - 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6) - .driver_data = (unsigned long)&util_kvp }, - { }, -}; - -MODULE_DEVICE_TABLE(vmbus, id_table); - -/* The one and only one */ -static struct hv_driver util_drv = { - .name = "hv_util", - .id_table = id_table, - .probe = util_probe, - .remove = util_remove, -}; - -static int __init init_hyperv_utils(void) -{ - pr_info("Registering HyperV Utility Driver\n"); - - return vmbus_driver_register(&util_drv); -} - -static void exit_hyperv_utils(void) -{ - pr_info("De-Registered HyperV Utility Driver\n"); - - vmbus_driver_unregister(&util_drv); -} - -module_init(init_hyperv_utils); -module_exit(exit_hyperv_utils); - -MODULE_DESCRIPTION("Hyper-V Utilities"); -MODULE_VERSION(HV_DRV_VERSION); -MODULE_LICENSE("GPL"); |