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![K. Y. Srinivasan](/assets/img/avatar_default.png)
When the offer is rescinded, vmbus_close() can free up the channel; deinitialize the service before closing the channel. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
447 lines
11 KiB
C
447 lines
11 KiB
C
/*
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* Copyright (c) 2010, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/reboot.h>
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#include <linux/hyperv.h>
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#include "hyperv_vmbus.h"
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#define SD_MAJOR 3
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#define SD_MINOR 0
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#define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)
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#define SD_WS2008_MAJOR 1
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#define SD_WS2008_VERSION (SD_WS2008_MAJOR << 16 | SD_MINOR)
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#define TS_MAJOR 3
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#define TS_MINOR 0
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#define TS_VERSION (TS_MAJOR << 16 | TS_MINOR)
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#define TS_WS2008_MAJOR 1
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#define TS_WS2008_VERSION (TS_WS2008_MAJOR << 16 | TS_MINOR)
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#define HB_MAJOR 3
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#define HB_MINOR 0
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#define HB_VERSION (HB_MAJOR << 16 | HB_MINOR)
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#define HB_WS2008_MAJOR 1
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#define HB_WS2008_VERSION (HB_WS2008_MAJOR << 16 | HB_MINOR)
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static int sd_srv_version;
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static int ts_srv_version;
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static int hb_srv_version;
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static int util_fw_version;
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static void shutdown_onchannelcallback(void *context);
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static struct hv_util_service util_shutdown = {
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.util_cb = shutdown_onchannelcallback,
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};
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static void timesync_onchannelcallback(void *context);
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static struct hv_util_service util_timesynch = {
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.util_cb = timesync_onchannelcallback,
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};
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static void heartbeat_onchannelcallback(void *context);
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static struct hv_util_service util_heartbeat = {
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.util_cb = heartbeat_onchannelcallback,
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};
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static struct hv_util_service util_kvp = {
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.util_cb = hv_kvp_onchannelcallback,
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.util_init = hv_kvp_init,
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.util_deinit = hv_kvp_deinit,
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};
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static struct hv_util_service util_vss = {
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.util_cb = hv_vss_onchannelcallback,
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.util_init = hv_vss_init,
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.util_deinit = hv_vss_deinit,
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};
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static struct hv_util_service util_fcopy = {
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.util_cb = hv_fcopy_onchannelcallback,
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.util_init = hv_fcopy_init,
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.util_deinit = hv_fcopy_deinit,
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};
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static void perform_shutdown(struct work_struct *dummy)
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{
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orderly_poweroff(true);
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}
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/*
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* Perform the shutdown operation in a thread context.
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*/
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static DECLARE_WORK(shutdown_work, perform_shutdown);
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static void shutdown_onchannelcallback(void *context)
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{
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struct vmbus_channel *channel = context;
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u32 recvlen;
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u64 requestid;
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bool execute_shutdown = false;
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u8 *shut_txf_buf = util_shutdown.recv_buffer;
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struct shutdown_msg_data *shutdown_msg;
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struct icmsg_hdr *icmsghdrp;
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struct icmsg_negotiate *negop = NULL;
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vmbus_recvpacket(channel, shut_txf_buf,
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PAGE_SIZE, &recvlen, &requestid);
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if (recvlen > 0) {
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icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
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sizeof(struct vmbuspipe_hdr)];
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if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
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vmbus_prep_negotiate_resp(icmsghdrp, negop,
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shut_txf_buf, util_fw_version,
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sd_srv_version);
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} else {
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shutdown_msg =
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(struct shutdown_msg_data *)&shut_txf_buf[
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sizeof(struct vmbuspipe_hdr) +
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sizeof(struct icmsg_hdr)];
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switch (shutdown_msg->flags) {
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case 0:
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case 1:
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icmsghdrp->status = HV_S_OK;
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execute_shutdown = true;
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pr_info("Shutdown request received -"
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" graceful shutdown initiated\n");
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break;
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default:
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icmsghdrp->status = HV_E_FAIL;
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execute_shutdown = false;
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pr_info("Shutdown request received -"
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" Invalid request\n");
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break;
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}
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}
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icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
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| ICMSGHDRFLAG_RESPONSE;
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vmbus_sendpacket(channel, shut_txf_buf,
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recvlen, requestid,
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VM_PKT_DATA_INBAND, 0);
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}
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if (execute_shutdown == true)
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schedule_work(&shutdown_work);
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}
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/*
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* Set guest time to host UTC time.
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*/
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static inline void do_adj_guesttime(u64 hosttime)
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{
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s64 host_tns;
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struct timespec host_ts;
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host_tns = (hosttime - WLTIMEDELTA) * 100;
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host_ts = ns_to_timespec(host_tns);
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do_settimeofday(&host_ts);
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}
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/*
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* Set the host time in a process context.
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*/
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struct adj_time_work {
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struct work_struct work;
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u64 host_time;
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};
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static void hv_set_host_time(struct work_struct *work)
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{
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struct adj_time_work *wrk;
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wrk = container_of(work, struct adj_time_work, work);
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do_adj_guesttime(wrk->host_time);
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kfree(wrk);
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}
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/*
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* Synchronize time with host after reboot, restore, etc.
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*
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* ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
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* After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
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* message after the timesync channel is opened. Since the hv_utils module is
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* loaded after hv_vmbus, the first message is usually missed. The other
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* thing is, systime is automatically set to emulated hardware clock which may
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* not be UTC time or in the same time zone. So, to override these effects, we
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* use the first 50 time samples for initial system time setting.
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*/
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static inline void adj_guesttime(u64 hosttime, u8 flags)
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{
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struct adj_time_work *wrk;
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static s32 scnt = 50;
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wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
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if (wrk == NULL)
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return;
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wrk->host_time = hosttime;
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if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
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INIT_WORK(&wrk->work, hv_set_host_time);
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schedule_work(&wrk->work);
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return;
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}
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if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
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scnt--;
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INIT_WORK(&wrk->work, hv_set_host_time);
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schedule_work(&wrk->work);
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} else
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kfree(wrk);
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}
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/*
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* Time Sync Channel message handler.
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*/
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static void timesync_onchannelcallback(void *context)
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{
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struct vmbus_channel *channel = context;
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u32 recvlen;
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u64 requestid;
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struct icmsg_hdr *icmsghdrp;
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struct ictimesync_data *timedatap;
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u8 *time_txf_buf = util_timesynch.recv_buffer;
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struct icmsg_negotiate *negop = NULL;
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vmbus_recvpacket(channel, time_txf_buf,
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PAGE_SIZE, &recvlen, &requestid);
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if (recvlen > 0) {
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icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
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sizeof(struct vmbuspipe_hdr)];
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if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
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vmbus_prep_negotiate_resp(icmsghdrp, negop,
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time_txf_buf,
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util_fw_version,
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ts_srv_version);
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} else {
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timedatap = (struct ictimesync_data *)&time_txf_buf[
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sizeof(struct vmbuspipe_hdr) +
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sizeof(struct icmsg_hdr)];
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adj_guesttime(timedatap->parenttime, timedatap->flags);
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}
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icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
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| ICMSGHDRFLAG_RESPONSE;
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vmbus_sendpacket(channel, time_txf_buf,
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recvlen, requestid,
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VM_PKT_DATA_INBAND, 0);
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}
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}
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/*
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* Heartbeat functionality.
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* Every two seconds, Hyper-V send us a heartbeat request message.
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* we respond to this message, and Hyper-V knows we are alive.
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*/
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static void heartbeat_onchannelcallback(void *context)
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{
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struct vmbus_channel *channel = context;
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u32 recvlen;
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u64 requestid;
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struct icmsg_hdr *icmsghdrp;
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struct heartbeat_msg_data *heartbeat_msg;
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u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
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struct icmsg_negotiate *negop = NULL;
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vmbus_recvpacket(channel, hbeat_txf_buf,
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PAGE_SIZE, &recvlen, &requestid);
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if (recvlen > 0) {
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icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
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sizeof(struct vmbuspipe_hdr)];
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if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
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vmbus_prep_negotiate_resp(icmsghdrp, negop,
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hbeat_txf_buf, util_fw_version,
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hb_srv_version);
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} else {
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heartbeat_msg =
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(struct heartbeat_msg_data *)&hbeat_txf_buf[
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sizeof(struct vmbuspipe_hdr) +
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sizeof(struct icmsg_hdr)];
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heartbeat_msg->seq_num += 1;
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}
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icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
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| ICMSGHDRFLAG_RESPONSE;
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vmbus_sendpacket(channel, hbeat_txf_buf,
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recvlen, requestid,
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VM_PKT_DATA_INBAND, 0);
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}
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}
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static int util_probe(struct hv_device *dev,
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const struct hv_vmbus_device_id *dev_id)
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{
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struct hv_util_service *srv =
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(struct hv_util_service *)dev_id->driver_data;
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int ret;
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srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
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if (!srv->recv_buffer)
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return -ENOMEM;
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if (srv->util_init) {
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ret = srv->util_init(srv);
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if (ret) {
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ret = -ENODEV;
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goto error1;
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}
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}
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/*
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* The set of services managed by the util driver are not performance
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* critical and do not need batched reading. Furthermore, some services
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* such as KVP can only handle one message from the host at a time.
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* Turn off batched reading for all util drivers before we open the
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* channel.
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*/
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set_channel_read_state(dev->channel, false);
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hv_set_drvdata(dev, srv);
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/*
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* Based on the host; initialize the framework and
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* service version numbers we will negotiate.
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*/
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switch (vmbus_proto_version) {
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case (VERSION_WS2008):
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util_fw_version = UTIL_WS2K8_FW_VERSION;
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sd_srv_version = SD_WS2008_VERSION;
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ts_srv_version = TS_WS2008_VERSION;
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hb_srv_version = HB_WS2008_VERSION;
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break;
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default:
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util_fw_version = UTIL_FW_VERSION;
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sd_srv_version = SD_VERSION;
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ts_srv_version = TS_VERSION;
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hb_srv_version = HB_VERSION;
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}
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ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
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srv->util_cb, dev->channel);
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if (ret)
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goto error;
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return 0;
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error:
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if (srv->util_deinit)
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srv->util_deinit();
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error1:
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kfree(srv->recv_buffer);
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return ret;
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}
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static int util_remove(struct hv_device *dev)
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{
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struct hv_util_service *srv = hv_get_drvdata(dev);
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if (srv->util_deinit)
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srv->util_deinit();
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vmbus_close(dev->channel);
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kfree(srv->recv_buffer);
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return 0;
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}
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static const struct hv_vmbus_device_id id_table[] = {
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/* Shutdown guid */
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{ HV_SHUTDOWN_GUID,
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.driver_data = (unsigned long)&util_shutdown
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},
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/* Time synch guid */
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{ HV_TS_GUID,
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.driver_data = (unsigned long)&util_timesynch
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},
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/* Heartbeat guid */
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{ HV_HEART_BEAT_GUID,
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.driver_data = (unsigned long)&util_heartbeat
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},
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/* KVP guid */
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{ HV_KVP_GUID,
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.driver_data = (unsigned long)&util_kvp
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},
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/* VSS GUID */
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{ HV_VSS_GUID,
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.driver_data = (unsigned long)&util_vss
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},
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/* File copy GUID */
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{ HV_FCOPY_GUID,
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.driver_data = (unsigned long)&util_fcopy
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},
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{ },
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};
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MODULE_DEVICE_TABLE(vmbus, id_table);
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/* The one and only one */
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static struct hv_driver util_drv = {
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.name = "hv_util",
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.id_table = id_table,
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.probe = util_probe,
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.remove = util_remove,
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};
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static int __init init_hyperv_utils(void)
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{
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pr_info("Registering HyperV Utility Driver\n");
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return vmbus_driver_register(&util_drv);
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}
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static void exit_hyperv_utils(void)
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{
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pr_info("De-Registered HyperV Utility Driver\n");
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vmbus_driver_unregister(&util_drv);
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}
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module_init(init_hyperv_utils);
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module_exit(exit_hyperv_utils);
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MODULE_DESCRIPTION("Hyper-V Utilities");
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MODULE_LICENSE("GPL");
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