742 строки
18 KiB
C
742 строки
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2010, Microsoft Corporation.
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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 <linux/clockchips.h>
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#include <linux/ptp_clock_kernel.h>
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#include <clocksource/hyperv_timer.h>
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#include <asm/mshyperv.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_MINOR_1 1
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#define SD_MINOR_2 2
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#define SD_VERSION_3_1 (SD_MAJOR << 16 | SD_MINOR_1)
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#define SD_VERSION_3_2 (SD_MAJOR << 16 | SD_MINOR_2)
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#define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)
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#define SD_MAJOR_1 1
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#define SD_VERSION_1 (SD_MAJOR_1 << 16 | SD_MINOR)
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#define TS_MAJOR 4
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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_MAJOR_1 1
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#define TS_VERSION_1 (TS_MAJOR_1 << 16 | TS_MINOR)
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#define TS_MAJOR_3 3
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#define TS_VERSION_3 (TS_MAJOR_3 << 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_MAJOR_1 1
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#define HB_VERSION_1 (HB_MAJOR_1 << 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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#define SD_VER_COUNT 4
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static const int sd_versions[] = {
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SD_VERSION_3_2,
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SD_VERSION_3_1,
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SD_VERSION,
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SD_VERSION_1
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};
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#define TS_VER_COUNT 3
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static const int ts_versions[] = {
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TS_VERSION,
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TS_VERSION_3,
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TS_VERSION_1
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};
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#define HB_VER_COUNT 2
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static const int hb_versions[] = {
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HB_VERSION,
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HB_VERSION_1
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};
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#define FW_VER_COUNT 2
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static const int fw_versions[] = {
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UTIL_FW_VERSION,
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UTIL_WS2K8_FW_VERSION
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};
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/*
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* Send the "hibernate" udev event in a thread context.
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*/
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struct hibernate_work_context {
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struct work_struct work;
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struct hv_device *dev;
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};
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static struct hibernate_work_context hibernate_context;
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static bool hibernation_supported;
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static void send_hibernate_uevent(struct work_struct *work)
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{
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char *uevent_env[2] = { "EVENT=hibernate", NULL };
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struct hibernate_work_context *ctx;
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ctx = container_of(work, struct hibernate_work_context, work);
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kobject_uevent_env(&ctx->dev->device.kobj, KOBJ_CHANGE, uevent_env);
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pr_info("Sent hibernation uevent\n");
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}
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static int hv_shutdown_init(struct hv_util_service *srv)
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{
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struct vmbus_channel *channel = srv->channel;
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INIT_WORK(&hibernate_context.work, send_hibernate_uevent);
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hibernate_context.dev = channel->device_obj;
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hibernation_supported = hv_is_hibernation_supported();
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return 0;
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}
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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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.util_init = hv_shutdown_init,
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};
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static int hv_timesync_init(struct hv_util_service *srv);
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static int hv_timesync_pre_suspend(void);
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static void hv_timesync_deinit(void);
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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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.util_init = hv_timesync_init,
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.util_pre_suspend = hv_timesync_pre_suspend,
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.util_deinit = hv_timesync_deinit,
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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_pre_suspend = hv_kvp_pre_suspend,
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.util_pre_resume = hv_kvp_pre_resume,
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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_pre_suspend = hv_vss_pre_suspend,
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.util_pre_resume = hv_vss_pre_resume,
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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_pre_suspend = hv_fcopy_pre_suspend,
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.util_pre_resume = hv_fcopy_pre_resume,
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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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static void perform_restart(struct work_struct *dummy)
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{
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orderly_reboot();
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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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/*
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* Perform the restart operation in a thread context.
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*/
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static DECLARE_WORK(restart_work, perform_restart);
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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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struct work_struct *work = NULL;
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u32 recvlen;
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u64 requestid;
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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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vmbus_recvpacket(channel, shut_txf_buf,
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HV_HYP_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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if (vmbus_prep_negotiate_resp(icmsghdrp, shut_txf_buf,
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fw_versions, FW_VER_COUNT,
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sd_versions, SD_VER_COUNT,
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NULL, &sd_srv_version)) {
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pr_info("Shutdown IC version %d.%d\n",
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sd_srv_version >> 16,
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sd_srv_version & 0xFFFF);
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}
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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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/*
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* shutdown_msg->flags can be 0(shut down), 2(reboot),
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* or 4(hibernate). It may bitwise-OR 1, which means
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* performing the request by force. Linux always tries
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* to perform the request by force.
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*/
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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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work = &shutdown_work;
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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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case 2:
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case 3:
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icmsghdrp->status = HV_S_OK;
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work = &restart_work;
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pr_info("Restart request received -"
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" graceful restart initiated\n");
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break;
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case 4:
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case 5:
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pr_info("Hibernation request received\n");
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icmsghdrp->status = hibernation_supported ?
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HV_S_OK : HV_E_FAIL;
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if (hibernation_supported)
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work = &hibernate_context.work;
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break;
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default:
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icmsghdrp->status = HV_E_FAIL;
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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 (work)
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schedule_work(work);
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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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static struct work_struct adj_time_work;
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/*
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* The last time sample, received from the host. PTP device responds to
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* requests by using this data and the current partition-wide time reference
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* count.
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*/
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static struct {
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u64 host_time;
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u64 ref_time;
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spinlock_t lock;
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} host_ts;
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static inline u64 reftime_to_ns(u64 reftime)
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{
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return (reftime - WLTIMEDELTA) * 100;
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}
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/*
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* Hard coded threshold for host timesync delay: 600 seconds
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*/
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static const u64 HOST_TIMESYNC_DELAY_THRESH = 600 * (u64)NSEC_PER_SEC;
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static int hv_get_adj_host_time(struct timespec64 *ts)
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{
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u64 newtime, reftime, timediff_adj;
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&host_ts.lock, flags);
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reftime = hv_read_reference_counter();
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/*
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* We need to let the caller know that last update from host
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* is older than the max allowable threshold. clock_gettime()
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* and PTP ioctl do not have a documented error that we could
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* return for this specific case. Use ESTALE to report this.
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*/
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timediff_adj = reftime - host_ts.ref_time;
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if (timediff_adj * 100 > HOST_TIMESYNC_DELAY_THRESH) {
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pr_warn_once("TIMESYNC IC: Stale time stamp, %llu nsecs old\n",
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(timediff_adj * 100));
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ret = -ESTALE;
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}
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newtime = host_ts.host_time + timediff_adj;
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*ts = ns_to_timespec64(reftime_to_ns(newtime));
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spin_unlock_irqrestore(&host_ts.lock, flags);
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return ret;
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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 timespec64 ts;
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if (!hv_get_adj_host_time(&ts))
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do_settimeofday64(&ts);
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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. This bit is
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* considered a hard request to discipline the clock.
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*
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* ICTIMESYNCFLAG_SAMPLE bit indicates a time sample from host. This is
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* typically used as a hint to the guest. The guest is under no obligation
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* to discipline the clock.
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*/
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static inline void adj_guesttime(u64 hosttime, u64 reftime, u8 adj_flags)
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{
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unsigned long flags;
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u64 cur_reftime;
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/*
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* Save the adjusted time sample from the host and the snapshot
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* of the current system time.
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*/
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spin_lock_irqsave(&host_ts.lock, flags);
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cur_reftime = hv_read_reference_counter();
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host_ts.host_time = hosttime;
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host_ts.ref_time = cur_reftime;
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/*
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* TimeSync v4 messages contain reference time (guest's Hyper-V
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* clocksource read when the time sample was generated), we can
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* improve the precision by adding the delta between now and the
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* time of generation. For older protocols we set
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* reftime == cur_reftime on call.
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*/
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host_ts.host_time += (cur_reftime - reftime);
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spin_unlock_irqrestore(&host_ts.lock, flags);
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/* Schedule work to do do_settimeofday64() */
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if (adj_flags & ICTIMESYNCFLAG_SYNC)
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schedule_work(&adj_time_work);
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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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struct ictimesync_ref_data *refdata;
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u8 *time_txf_buf = util_timesynch.recv_buffer;
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/*
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* Drain the ring buffer and use the last packet to update
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* host_ts
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*/
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while (1) {
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int ret = vmbus_recvpacket(channel, time_txf_buf,
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HV_HYP_PAGE_SIZE, &recvlen,
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&requestid);
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if (ret) {
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pr_warn_once("TimeSync IC pkt recv failed (Err: %d)\n",
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ret);
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break;
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}
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if (!recvlen)
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break;
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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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if (vmbus_prep_negotiate_resp(icmsghdrp, time_txf_buf,
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fw_versions, FW_VER_COUNT,
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ts_versions, TS_VER_COUNT,
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NULL, &ts_srv_version)) {
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pr_info("TimeSync IC version %d.%d\n",
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ts_srv_version >> 16,
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ts_srv_version & 0xFFFF);
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}
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} else {
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if (ts_srv_version > TS_VERSION_3) {
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refdata = (struct ictimesync_ref_data *)
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&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(refdata->parenttime,
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refdata->vmreferencetime,
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refdata->flags);
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} else {
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timedatap = (struct ictimesync_data *)
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&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,
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hv_read_reference_counter(),
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timedatap->flags);
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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, 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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while (1) {
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vmbus_recvpacket(channel, hbeat_txf_buf,
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HV_HYP_PAGE_SIZE, &recvlen, &requestid);
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if (!recvlen)
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break;
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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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if (vmbus_prep_negotiate_resp(icmsghdrp,
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hbeat_txf_buf,
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fw_versions, FW_VER_COUNT,
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hb_versions, HB_VER_COUNT,
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NULL, &hb_srv_version)) {
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pr_info("Heartbeat IC version %d.%d\n",
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hb_srv_version >> 16,
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hb_srv_version & 0xFFFF);
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}
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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(HV_HYP_PAGE_SIZE * 4, GFP_KERNEL);
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if (!srv->recv_buffer)
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return -ENOMEM;
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srv->channel = dev->channel;
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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;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The set of services managed by the util driver are not performance
|
|
* critical and do not need batched reading. Furthermore, some services
|
|
* such as KVP can only handle one message from the host at a time.
|
|
* Turn off batched reading for all util drivers before we open the
|
|
* channel.
|
|
*/
|
|
set_channel_read_mode(dev->channel, HV_CALL_DIRECT);
|
|
|
|
hv_set_drvdata(dev, srv);
|
|
|
|
ret = vmbus_open(dev->channel, 4 * HV_HYP_PAGE_SIZE,
|
|
4 * HV_HYP_PAGE_SIZE, NULL, 0, srv->util_cb,
|
|
dev->channel);
|
|
if (ret)
|
|
goto error;
|
|
|
|
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);
|
|
|
|
if (srv->util_deinit)
|
|
srv->util_deinit();
|
|
vmbus_close(dev->channel);
|
|
kfree(srv->recv_buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* When we're in util_suspend(), all the userspace processes have been frozen
|
|
* (refer to hibernate() -> freeze_processes()). The userspace is thawed only
|
|
* after the whole resume procedure, including util_resume(), finishes.
|
|
*/
|
|
static int util_suspend(struct hv_device *dev)
|
|
{
|
|
struct hv_util_service *srv = hv_get_drvdata(dev);
|
|
int ret = 0;
|
|
|
|
if (srv->util_pre_suspend) {
|
|
ret = srv->util_pre_suspend();
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
vmbus_close(dev->channel);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int util_resume(struct hv_device *dev)
|
|
{
|
|
struct hv_util_service *srv = hv_get_drvdata(dev);
|
|
int ret = 0;
|
|
|
|
if (srv->util_pre_resume) {
|
|
ret = srv->util_pre_resume();
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = vmbus_open(dev->channel, 4 * HV_HYP_PAGE_SIZE,
|
|
4 * HV_HYP_PAGE_SIZE, NULL, 0, srv->util_cb,
|
|
dev->channel);
|
|
return ret;
|
|
}
|
|
|
|
static const struct hv_vmbus_device_id id_table[] = {
|
|
/* Shutdown guid */
|
|
{ HV_SHUTDOWN_GUID,
|
|
.driver_data = (unsigned long)&util_shutdown
|
|
},
|
|
/* Time synch guid */
|
|
{ HV_TS_GUID,
|
|
.driver_data = (unsigned long)&util_timesynch
|
|
},
|
|
/* Heartbeat guid */
|
|
{ HV_HEART_BEAT_GUID,
|
|
.driver_data = (unsigned long)&util_heartbeat
|
|
},
|
|
/* KVP guid */
|
|
{ HV_KVP_GUID,
|
|
.driver_data = (unsigned long)&util_kvp
|
|
},
|
|
/* VSS GUID */
|
|
{ HV_VSS_GUID,
|
|
.driver_data = (unsigned long)&util_vss
|
|
},
|
|
/* File copy GUID */
|
|
{ HV_FCOPY_GUID,
|
|
.driver_data = (unsigned long)&util_fcopy
|
|
},
|
|
{ },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(vmbus, id_table);
|
|
|
|
/* The one and only one */
|
|
static struct hv_driver util_drv = {
|
|
.name = "hv_utils",
|
|
.id_table = id_table,
|
|
.probe = util_probe,
|
|
.remove = util_remove,
|
|
.suspend = util_suspend,
|
|
.resume = util_resume,
|
|
.driver = {
|
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
},
|
|
};
|
|
|
|
static int hv_ptp_enable(struct ptp_clock_info *info,
|
|
struct ptp_clock_request *request, int on)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int hv_ptp_settime(struct ptp_clock_info *p, const struct timespec64 *ts)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int hv_ptp_adjfreq(struct ptp_clock_info *ptp, s32 delta)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
static int hv_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int hv_ptp_gettime(struct ptp_clock_info *info, struct timespec64 *ts)
|
|
{
|
|
return hv_get_adj_host_time(ts);
|
|
}
|
|
|
|
static struct ptp_clock_info ptp_hyperv_info = {
|
|
.name = "hyperv",
|
|
.enable = hv_ptp_enable,
|
|
.adjtime = hv_ptp_adjtime,
|
|
.adjfreq = hv_ptp_adjfreq,
|
|
.gettime64 = hv_ptp_gettime,
|
|
.settime64 = hv_ptp_settime,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct ptp_clock *hv_ptp_clock;
|
|
|
|
static int hv_timesync_init(struct hv_util_service *srv)
|
|
{
|
|
/* TimeSync requires Hyper-V clocksource. */
|
|
if (!hv_read_reference_counter)
|
|
return -ENODEV;
|
|
|
|
spin_lock_init(&host_ts.lock);
|
|
|
|
INIT_WORK(&adj_time_work, hv_set_host_time);
|
|
|
|
/*
|
|
* ptp_clock_register() returns NULL when CONFIG_PTP_1588_CLOCK is
|
|
* disabled but the driver is still useful without the PTP device
|
|
* as it still handles the ICTIMESYNCFLAG_SYNC case.
|
|
*/
|
|
hv_ptp_clock = ptp_clock_register(&ptp_hyperv_info, NULL);
|
|
if (IS_ERR_OR_NULL(hv_ptp_clock)) {
|
|
pr_err("cannot register PTP clock: %ld\n",
|
|
PTR_ERR(hv_ptp_clock));
|
|
hv_ptp_clock = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void hv_timesync_cancel_work(void)
|
|
{
|
|
cancel_work_sync(&adj_time_work);
|
|
}
|
|
|
|
static int hv_timesync_pre_suspend(void)
|
|
{
|
|
hv_timesync_cancel_work();
|
|
return 0;
|
|
}
|
|
|
|
static void hv_timesync_deinit(void)
|
|
{
|
|
if (hv_ptp_clock)
|
|
ptp_clock_unregister(hv_ptp_clock);
|
|
|
|
hv_timesync_cancel_work();
|
|
}
|
|
|
|
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_LICENSE("GPL");
|