1 /* $NetBSD: hvshutdown.c,v 1.2 2019/03/01 08:17:51 nonaka Exp $ */ 2 3 /*- 4 * Copyright (c) 2014,2016 Microsoft Corp. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #ifdef __KERNEL_RCSID 31 __KERNEL_RCSID(0, "$NetBSD: hvshutdown.c,v 1.2 2019/03/01 08:17:51 nonaka Exp $"); 32 #endif 33 #ifdef __FBSDID 34 __FBSDID("$FreeBSD: head/sys/dev/hyperv/utilities/vmbus_shutdown.c 310324 2016-12-20 09:46:14Z sephe $"); 35 #endif 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/device.h> 40 #include <sys/module.h> 41 #include <sys/pmf.h> 42 43 #include <dev/sysmon/sysmonvar.h> 44 #include <dev/sysmon/sysmon_taskq.h> 45 46 #include <dev/hyperv/vmbusvar.h> 47 #include <dev/hyperv/vmbusicreg.h> 48 #include <dev/hyperv/vmbusicvar.h> 49 50 #define VMBUS_SHUTDOWN_FWVER_MAJOR 3 51 #define VMBUS_SHUTDOWN_FWVER \ 52 VMBUS_IC_VERSION(VMBUS_SHUTDOWN_FWVER_MAJOR, 0) 53 54 #define VMBUS_SHUTDOWN_MSGVER_MAJOR 3 55 #define VMBUS_SHUTDOWN_MSGVER \ 56 VMBUS_IC_VERSION(VMBUS_SHUTDOWN_MSGVER_MAJOR, 0) 57 58 static int hvshutdown_match(device_t, cfdata_t, void *); 59 static void hvshutdown_attach(device_t, device_t, void *); 60 static int hvshutdown_detach(device_t, int); 61 62 static void hvshutdown_channel_cb(void *); 63 64 struct hvshutdown_softc { 65 struct vmbusic_softc sc_vmbusic; 66 67 struct sysmon_pswitch sc_smpsw; 68 }; 69 70 CFATTACH_DECL_NEW(hvshutdown, sizeof(struct hvshutdown_softc), 71 hvshutdown_match, hvshutdown_attach, hvshutdown_detach, NULL); 72 73 static int 74 hvshutdown_match(device_t parent, cfdata_t cf, void *aux) 75 { 76 struct vmbus_attach_args *aa = aux; 77 78 return vmbusic_probe(aa, &hyperv_guid_shutdown); 79 } 80 81 static void 82 hvshutdown_attach(device_t parent, device_t self, void *aux) 83 { 84 struct hvshutdown_softc *sc = device_private(self); 85 struct vmbus_attach_args *aa = aux; 86 int error; 87 88 aprint_naive("\n"); 89 aprint_normal(": Hyper-V Guest Shutdown Service\n"); 90 91 error = vmbusic_attach(self, aa, hvshutdown_channel_cb); 92 if (error) 93 return; 94 95 (void) pmf_device_register(self, NULL, NULL); 96 97 sysmon_task_queue_init(); 98 99 sc->sc_smpsw.smpsw_name = device_xname(self); 100 sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_POWER; 101 (void) sysmon_pswitch_register(&sc->sc_smpsw); 102 } 103 104 static int 105 hvshutdown_detach(device_t self, int flags) 106 { 107 struct hvshutdown_softc *sc = device_private(self); 108 int error; 109 110 error = vmbusic_detach(self, flags); 111 if (error) 112 return error; 113 114 pmf_device_deregister(self); 115 sysmon_pswitch_unregister(&sc->sc_smpsw); 116 117 return 0; 118 } 119 120 static void 121 hvshutdown_do_shutdown(void *arg) 122 { 123 struct hvshutdown_softc *sc = arg; 124 125 sysmon_pswitch_event(&sc->sc_smpsw, PSWITCH_EVENT_PRESSED); 126 } 127 128 static void 129 hvshutdown_channel_cb(void *arg) 130 { 131 struct hvshutdown_softc *sc = arg; 132 struct vmbusic_softc *vsc = &sc->sc_vmbusic; 133 struct vmbus_channel *ch = vsc->sc_chan; 134 struct vmbus_icmsg_hdr *hdr; 135 struct vmbus_icmsg_shutdown *msg; 136 uint64_t rid; 137 uint32_t rlen; 138 int error; 139 bool do_shutdown = false; 140 141 error = vmbus_channel_recv(ch, vsc->sc_buf, vsc->sc_buflen, 142 &rlen, &rid, 0); 143 if (error || rlen == 0) { 144 if (error != EAGAIN) { 145 DPRINTF("%s: shutdown error=%d len=%u\n", 146 device_xname(vsc->sc_dev), error, rlen); 147 } 148 return; 149 } 150 if (rlen < sizeof(*hdr)) { 151 DPRINTF("%s: shutdown short read len=%u\n", 152 device_xname(vsc->sc_dev), rlen); 153 return; 154 } 155 156 hdr = (struct vmbus_icmsg_hdr *)vsc->sc_buf; 157 switch (hdr->ic_type) { 158 case VMBUS_ICMSG_TYPE_NEGOTIATE: 159 error = vmbusic_negotiate(vsc, hdr, &rlen, VMBUS_SHUTDOWN_FWVER, 160 VMBUS_SHUTDOWN_MSGVER); 161 if (error) 162 return; 163 break; 164 165 case VMBUS_ICMSG_TYPE_SHUTDOWN: 166 if (rlen < VMBUS_ICMSG_SHUTDOWN_SIZE_MIN) { 167 DPRINTF("%s: invalid shutdown len=%u\n", 168 device_xname(vsc->sc_dev), rlen); 169 return; 170 } 171 172 msg = (struct vmbus_icmsg_shutdown *)hdr; 173 if (msg->ic_haltflags == 0 || msg->ic_haltflags == 1) { 174 device_printf(vsc->sc_dev, "shutdown requested\n"); 175 hdr->ic_status = VMBUS_ICMSG_STATUS_OK; 176 do_shutdown = true; 177 } else { 178 device_printf(vsc->sc_dev, 179 "unknown shutdown flags 0x%08x\n", 180 msg->ic_haltflags); 181 hdr->ic_status = VMBUS_ICMSG_STATUS_FAIL; 182 } 183 break; 184 185 default: 186 device_printf(vsc->sc_dev, 187 "unhandled shutdown message type %u\n", hdr->ic_type); 188 return; 189 } 190 191 (void) vmbusic_sendresp(vsc, ch, vsc->sc_buf, rlen, rid); 192 193 if (do_shutdown) 194 sysmon_task_queue_sched(0, hvshutdown_do_shutdown, sc); 195 } 196 197 MODULE(MODULE_CLASS_DRIVER, hvshutdown, "vmbus"); 198 199 #ifdef _MODULE 200 #include "ioconf.c" 201 #endif 202 203 static int 204 hvshutdown_modcmd(modcmd_t cmd, void *aux) 205 { 206 int error = 0; 207 208 switch (cmd) { 209 case MODULE_CMD_INIT: 210 #ifdef _MODULE 211 error = config_init_component(cfdriver_ioconf_hvshutdown, 212 cfattach_ioconf_hvshutdown, cfdata_ioconf_hvshutdown); 213 #endif 214 break; 215 216 case MODULE_CMD_FINI: 217 #ifdef _MODULE 218 error = config_fini_component(cfdriver_ioconf_hvshutdown, 219 cfattach_ioconf_hvshutdown, cfdata_ioconf_hvshutdown); 220 #endif 221 break; 222 223 case MODULE_CMD_AUTOUNLOAD: 224 error = EBUSY; 225 break; 226 227 default: 228 error = ENOTTY; 229 break; 230 } 231 232 return error; 233 } 234
Indexes created Tue Sep 30 17:09:57 GMT 2025