control.c revision 255040
1214077Sgibbs/*- 2214077Sgibbs * Copyright (c) 2010 Justin T. Gibbs, Spectra Logic Corporation 3214077Sgibbs * All rights reserved. 4214077Sgibbs * 5214077Sgibbs * Redistribution and use in source and binary forms, with or without 6214077Sgibbs * modification, are permitted provided that the following conditions 7214077Sgibbs * are met: 8214077Sgibbs * 1. Redistributions of source code must retain the above copyright 9214077Sgibbs * notice, this list of conditions, and the following disclaimer, 10214077Sgibbs * without modification. 11214077Sgibbs * 2. Redistributions in binary form must reproduce at minimum a disclaimer 12214077Sgibbs * substantially similar to the "NO WARRANTY" disclaimer below 13214077Sgibbs * ("Disclaimer") and any redistribution must be conditioned upon 14214077Sgibbs * including a substantially similar Disclaimer requirement for further 15214077Sgibbs * binary redistribution. 16214077Sgibbs * 17214077Sgibbs * NO WARRANTY 18214077Sgibbs * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19214077Sgibbs * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20214077Sgibbs * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 21214077Sgibbs * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22214077Sgibbs * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23214077Sgibbs * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24214077Sgibbs * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25214077Sgibbs * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26214077Sgibbs * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 27214077Sgibbs * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28214077Sgibbs * POSSIBILITY OF SUCH DAMAGES. 29214077Sgibbs */ 30214077Sgibbs 31214077Sgibbs/*- 32214077Sgibbs * PV suspend/resume support: 33214077Sgibbs * 34214077Sgibbs * Copyright (c) 2004 Christian Limpach. 35214077Sgibbs * Copyright (c) 2004-2006,2008 Kip Macy 36214077Sgibbs * All rights reserved. 37214077Sgibbs * 38214077Sgibbs * Redistribution and use in source and binary forms, with or without 39214077Sgibbs * modification, are permitted provided that the following conditions 40214077Sgibbs * are met: 41214077Sgibbs * 1. Redistributions of source code must retain the above copyright 42214077Sgibbs * notice, this list of conditions and the following disclaimer. 43214077Sgibbs * 2. Redistributions in binary form must reproduce the above copyright 44214077Sgibbs * notice, this list of conditions and the following disclaimer in the 45214077Sgibbs * documentation and/or other materials provided with the distribution. 46214077Sgibbs * 3. All advertising materials mentioning features or use of this software 47214077Sgibbs * must display the following acknowledgement: 48214077Sgibbs * This product includes software developed by Christian Limpach. 49214077Sgibbs * 4. The name of the author may not be used to endorse or promote products 50214077Sgibbs * derived from this software without specific prior written permission. 51214077Sgibbs * 52214077Sgibbs * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 53214077Sgibbs * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 54214077Sgibbs * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 55214077Sgibbs * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 56214077Sgibbs * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 57214077Sgibbs * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 58214077Sgibbs * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 59214077Sgibbs * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 60214077Sgibbs * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 61214077Sgibbs * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 62214077Sgibbs */ 63214077Sgibbs 64214077Sgibbs/*- 65214077Sgibbs * HVM suspend/resume support: 66214077Sgibbs * 67214077Sgibbs * Copyright (c) 2008 Citrix Systems, Inc. 68214077Sgibbs * All rights reserved. 69214077Sgibbs * 70214077Sgibbs * Redistribution and use in source and binary forms, with or without 71214077Sgibbs * modification, are permitted provided that the following conditions 72214077Sgibbs * are met: 73214077Sgibbs * 1. Redistributions of source code must retain the above copyright 74214077Sgibbs * notice, this list of conditions and the following disclaimer. 75214077Sgibbs * 2. Redistributions in binary form must reproduce the above copyright 76214077Sgibbs * notice, this list of conditions and the following disclaimer in the 77214077Sgibbs * documentation and/or other materials provided with the distribution. 78214077Sgibbs * 79214077Sgibbs * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 80214077Sgibbs * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 81214077Sgibbs * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 82214077Sgibbs * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 83214077Sgibbs * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 84214077Sgibbs * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 85214077Sgibbs * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 86214077Sgibbs * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 87214077Sgibbs * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 88214077Sgibbs * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 89214077Sgibbs * SUCH DAMAGE. 90214077Sgibbs */ 91214077Sgibbs#include <sys/cdefs.h> 92214077Sgibbs__FBSDID("$FreeBSD: head/sys/dev/xen/control/control.c 255040 2013-08-29 19:52:18Z gibbs $"); 93214077Sgibbs 94214077Sgibbs/** 95214077Sgibbs * \file control.c 96214077Sgibbs * 97214077Sgibbs * \brief Device driver to repond to control domain events that impact 98214077Sgibbs * this VM. 99214077Sgibbs */ 100214077Sgibbs 101214077Sgibbs#include <sys/param.h> 102214077Sgibbs#include <sys/systm.h> 103214077Sgibbs#include <sys/kernel.h> 104214077Sgibbs#include <sys/malloc.h> 105214077Sgibbs 106214077Sgibbs#include <sys/bio.h> 107214077Sgibbs#include <sys/bus.h> 108214077Sgibbs#include <sys/conf.h> 109214077Sgibbs#include <sys/disk.h> 110214077Sgibbs#include <sys/fcntl.h> 111214077Sgibbs#include <sys/filedesc.h> 112214077Sgibbs#include <sys/kdb.h> 113214077Sgibbs#include <sys/module.h> 114214077Sgibbs#include <sys/namei.h> 115214077Sgibbs#include <sys/proc.h> 116214077Sgibbs#include <sys/reboot.h> 117214077Sgibbs#include <sys/rman.h> 118225704Sgibbs#include <sys/sched.h> 119214077Sgibbs#include <sys/taskqueue.h> 120214077Sgibbs#include <sys/types.h> 121214077Sgibbs#include <sys/vnode.h> 122214077Sgibbs 123214077Sgibbs#ifndef XENHVM 124214077Sgibbs#include <sys/sched.h> 125214077Sgibbs#include <sys/smp.h> 126214077Sgibbs#endif 127214077Sgibbs 128214077Sgibbs#include <geom/geom.h> 129214077Sgibbs 130214077Sgibbs#include <machine/_inttypes.h> 131255040Sgibbs#include <machine/intr_machdep.h> 132214077Sgibbs 133214077Sgibbs#include <vm/vm.h> 134214077Sgibbs#include <vm/vm_extern.h> 135214077Sgibbs#include <vm/vm_kern.h> 136214077Sgibbs 137255040Sgibbs#include <xen/xen-os.h> 138214077Sgibbs#include <xen/blkif.h> 139214077Sgibbs#include <xen/evtchn.h> 140214077Sgibbs#include <xen/gnttab.h> 141214077Sgibbs#include <xen/xen_intr.h> 142214077Sgibbs 143214077Sgibbs#include <xen/interface/event_channel.h> 144214077Sgibbs#include <xen/interface/grant_table.h> 145214077Sgibbs 146214077Sgibbs#include <xen/xenbus/xenbusvar.h> 147214077Sgibbs 148255040Sgibbs#include <machine/xen/xenvar.h> 149255040Sgibbs#include <machine/xen/xenfunc.h> 150255040Sgibbs 151214077Sgibbs/*--------------------------- Forward Declarations --------------------------*/ 152214077Sgibbs/** Function signature for shutdown event handlers. */ 153214077Sgibbstypedef void (xctrl_shutdown_handler_t)(void); 154214077Sgibbs 155214077Sgibbsstatic xctrl_shutdown_handler_t xctrl_poweroff; 156214077Sgibbsstatic xctrl_shutdown_handler_t xctrl_reboot; 157214077Sgibbsstatic xctrl_shutdown_handler_t xctrl_suspend; 158214077Sgibbsstatic xctrl_shutdown_handler_t xctrl_crash; 159214077Sgibbsstatic xctrl_shutdown_handler_t xctrl_halt; 160214077Sgibbs 161214077Sgibbs/*-------------------------- Private Data Structures -------------------------*/ 162214077Sgibbs/** Element type for lookup table of event name to handler. */ 163214077Sgibbsstruct xctrl_shutdown_reason { 164214077Sgibbs const char *name; 165214077Sgibbs xctrl_shutdown_handler_t *handler; 166214077Sgibbs}; 167214077Sgibbs 168214077Sgibbs/** Lookup table for shutdown event name to handler. */ 169244990Smariusstatic const struct xctrl_shutdown_reason xctrl_shutdown_reasons[] = { 170214077Sgibbs { "poweroff", xctrl_poweroff }, 171214077Sgibbs { "reboot", xctrl_reboot }, 172214077Sgibbs { "suspend", xctrl_suspend }, 173214077Sgibbs { "crash", xctrl_crash }, 174214077Sgibbs { "halt", xctrl_halt }, 175214077Sgibbs}; 176214077Sgibbs 177214077Sgibbsstruct xctrl_softc { 178214077Sgibbs struct xs_watch xctrl_watch; 179214077Sgibbs}; 180214077Sgibbs 181214077Sgibbs/*------------------------------ Event Handlers ------------------------------*/ 182214077Sgibbsstatic void 183214077Sgibbsxctrl_poweroff() 184214077Sgibbs{ 185214077Sgibbs shutdown_nice(RB_POWEROFF|RB_HALT); 186214077Sgibbs} 187214077Sgibbs 188214077Sgibbsstatic void 189214077Sgibbsxctrl_reboot() 190214077Sgibbs{ 191214077Sgibbs shutdown_nice(0); 192214077Sgibbs} 193214077Sgibbs 194214077Sgibbs#ifndef XENHVM 195214077Sgibbsextern void xencons_suspend(void); 196214077Sgibbsextern void xencons_resume(void); 197214077Sgibbs 198214077Sgibbs/* Full PV mode suspension. */ 199214077Sgibbsstatic void 200214077Sgibbsxctrl_suspend() 201214077Sgibbs{ 202214077Sgibbs int i, j, k, fpp; 203214077Sgibbs unsigned long max_pfn, start_info_mfn; 204214077Sgibbs 205225704Sgibbs EVENTHANDLER_INVOKE(power_suspend); 206225704Sgibbs 207214077Sgibbs#ifdef SMP 208222813Sattilio struct thread *td; 209222813Sattilio cpuset_t map; 210244990Smarius u_int cpuid; 211244990Smarius 212214077Sgibbs /* 213214077Sgibbs * Bind us to CPU 0 and stop any other VCPUs. 214214077Sgibbs */ 215222813Sattilio td = curthread; 216222813Sattilio thread_lock(td); 217222813Sattilio sched_bind(td, 0); 218222813Sattilio thread_unlock(td); 219223758Sattilio cpuid = PCPU_GET(cpuid); 220223758Sattilio KASSERT(cpuid == 0, ("xen_suspend: not running on cpu 0")); 221214077Sgibbs 222223758Sattilio map = all_cpus; 223223758Sattilio CPU_CLR(cpuid, &map); 224222813Sattilio CPU_NAND(&map, &stopped_cpus); 225222813Sattilio if (!CPU_EMPTY(&map)) 226214077Sgibbs stop_cpus(map); 227214077Sgibbs#endif 228214077Sgibbs 229225704Sgibbs /* 230225704Sgibbs * Be sure to hold Giant across DEVICE_SUSPEND/RESUME since non-MPSAFE 231225704Sgibbs * drivers need this. 232225704Sgibbs */ 233225704Sgibbs mtx_lock(&Giant); 234214077Sgibbs if (DEVICE_SUSPEND(root_bus) != 0) { 235225704Sgibbs mtx_unlock(&Giant); 236244990Smarius printf("%s: device_suspend failed\n", __func__); 237214077Sgibbs#ifdef SMP 238222813Sattilio if (!CPU_EMPTY(&map)) 239214077Sgibbs restart_cpus(map); 240214077Sgibbs#endif 241214077Sgibbs return; 242214077Sgibbs } 243225704Sgibbs mtx_unlock(&Giant); 244214077Sgibbs 245214077Sgibbs local_irq_disable(); 246214077Sgibbs 247214077Sgibbs xencons_suspend(); 248214077Sgibbs gnttab_suspend(); 249255040Sgibbs intr_suspend(); 250214077Sgibbs 251214077Sgibbs max_pfn = HYPERVISOR_shared_info->arch.max_pfn; 252214077Sgibbs 253214077Sgibbs void *shared_info = HYPERVISOR_shared_info; 254214077Sgibbs HYPERVISOR_shared_info = NULL; 255214077Sgibbs pmap_kremove((vm_offset_t) shared_info); 256214077Sgibbs PT_UPDATES_FLUSH(); 257214077Sgibbs 258214077Sgibbs xen_start_info->store_mfn = MFNTOPFN(xen_start_info->store_mfn); 259214077Sgibbs xen_start_info->console.domU.mfn = MFNTOPFN(xen_start_info->console.domU.mfn); 260214077Sgibbs 261214077Sgibbs /* 262214077Sgibbs * We'll stop somewhere inside this hypercall. When it returns, 263214077Sgibbs * we'll start resuming after the restore. 264214077Sgibbs */ 265214077Sgibbs start_info_mfn = VTOMFN(xen_start_info); 266214077Sgibbs pmap_suspend(); 267214077Sgibbs HYPERVISOR_suspend(start_info_mfn); 268214077Sgibbs pmap_resume(); 269214077Sgibbs 270214077Sgibbs pmap_kenter_ma((vm_offset_t) shared_info, xen_start_info->shared_info); 271214077Sgibbs HYPERVISOR_shared_info = shared_info; 272214077Sgibbs 273214077Sgibbs HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = 274214077Sgibbs VTOMFN(xen_pfn_to_mfn_frame_list_list); 275214077Sgibbs 276214077Sgibbs fpp = PAGE_SIZE/sizeof(unsigned long); 277214077Sgibbs for (i = 0, j = 0, k = -1; i < max_pfn; i += fpp, j++) { 278214077Sgibbs if ((j % fpp) == 0) { 279214077Sgibbs k++; 280214077Sgibbs xen_pfn_to_mfn_frame_list_list[k] = 281214077Sgibbs VTOMFN(xen_pfn_to_mfn_frame_list[k]); 282214077Sgibbs j = 0; 283214077Sgibbs } 284214077Sgibbs xen_pfn_to_mfn_frame_list[k][j] = 285214077Sgibbs VTOMFN(&xen_phys_machine[i]); 286214077Sgibbs } 287214077Sgibbs HYPERVISOR_shared_info->arch.max_pfn = max_pfn; 288214077Sgibbs 289214077Sgibbs gnttab_resume(); 290255040Sgibbs intr_resume(); 291214077Sgibbs local_irq_enable(); 292214077Sgibbs xencons_resume(); 293214077Sgibbs 294214077Sgibbs#ifdef CONFIG_SMP 295214077Sgibbs for_each_cpu(i) 296214077Sgibbs vcpu_prepare(i); 297214077Sgibbs 298214077Sgibbs#endif 299225704Sgibbs 300214077Sgibbs /* 301214077Sgibbs * Only resume xenbus /after/ we've prepared our VCPUs; otherwise 302214077Sgibbs * the VCPU hotplug callback can race with our vcpu_prepare 303214077Sgibbs */ 304225704Sgibbs mtx_lock(&Giant); 305214077Sgibbs DEVICE_RESUME(root_bus); 306225704Sgibbs mtx_unlock(&Giant); 307214077Sgibbs 308214077Sgibbs#ifdef SMP 309214077Sgibbs thread_lock(curthread); 310214077Sgibbs sched_unbind(curthread); 311214077Sgibbs thread_unlock(curthread); 312222813Sattilio if (!CPU_EMPTY(&map)) 313214077Sgibbs restart_cpus(map); 314214077Sgibbs#endif 315225704Sgibbs EVENTHANDLER_INVOKE(power_resume); 316214077Sgibbs} 317214077Sgibbs 318214077Sgibbsstatic void 319214077Sgibbsxen_pv_shutdown_final(void *arg, int howto) 320214077Sgibbs{ 321214077Sgibbs /* 322214077Sgibbs * Inform the hypervisor that shutdown is complete. 323214077Sgibbs * This is not necessary in HVM domains since Xen 324214077Sgibbs * emulates ACPI in that mode and FreeBSD's ACPI 325214077Sgibbs * support will request this transition. 326214077Sgibbs */ 327214077Sgibbs if (howto & (RB_HALT | RB_POWEROFF)) 328214077Sgibbs HYPERVISOR_shutdown(SHUTDOWN_poweroff); 329214077Sgibbs else 330214077Sgibbs HYPERVISOR_shutdown(SHUTDOWN_reboot); 331214077Sgibbs} 332214077Sgibbs 333214077Sgibbs#else 334214077Sgibbsextern void xenpci_resume(void); 335214077Sgibbs 336214077Sgibbs/* HVM mode suspension. */ 337214077Sgibbsstatic void 338214077Sgibbsxctrl_suspend() 339214077Sgibbs{ 340214077Sgibbs int suspend_cancelled; 341214077Sgibbs 342225704Sgibbs EVENTHANDLER_INVOKE(power_suspend); 343225704Sgibbs 344225704Sgibbs /* 345225704Sgibbs * Be sure to hold Giant across DEVICE_SUSPEND/RESUME since non-MPSAFE 346225704Sgibbs * drivers need this. 347225704Sgibbs */ 348225704Sgibbs mtx_lock(&Giant); 349244990Smarius if (DEVICE_SUSPEND(root_bus) != 0) { 350225704Sgibbs mtx_unlock(&Giant); 351244990Smarius printf("%s: device_suspend failed\n", __func__); 352214077Sgibbs return; 353214077Sgibbs } 354225704Sgibbs mtx_unlock(&Giant); 355214077Sgibbs 356214077Sgibbs /* 357214077Sgibbs * Prevent any races with evtchn_interrupt() handler. 358214077Sgibbs */ 359225704Sgibbs disable_intr(); 360255040Sgibbs intr_suspend(); 361214077Sgibbs 362214077Sgibbs suspend_cancelled = HYPERVISOR_suspend(0); 363214077Sgibbs 364255040Sgibbs intr_resume(); 365255040Sgibbs 366214077Sgibbs /* 367214077Sgibbs * Re-enable interrupts and put the scheduler back to normal. 368214077Sgibbs */ 369214077Sgibbs enable_intr(); 370214077Sgibbs 371214077Sgibbs /* 372214077Sgibbs * FreeBSD really needs to add DEVICE_SUSPEND_CANCEL or 373214077Sgibbs * similar. 374214077Sgibbs */ 375225704Sgibbs mtx_lock(&Giant); 376214077Sgibbs if (!suspend_cancelled) 377214077Sgibbs DEVICE_RESUME(root_bus); 378225704Sgibbs mtx_unlock(&Giant); 379225704Sgibbs 380225704Sgibbs EVENTHANDLER_INVOKE(power_resume); 381214077Sgibbs} 382214077Sgibbs#endif 383214077Sgibbs 384214077Sgibbsstatic void 385214077Sgibbsxctrl_crash() 386214077Sgibbs{ 387214077Sgibbs panic("Xen directed crash"); 388214077Sgibbs} 389214077Sgibbs 390214077Sgibbsstatic void 391214077Sgibbsxctrl_halt() 392214077Sgibbs{ 393214077Sgibbs shutdown_nice(RB_HALT); 394214077Sgibbs} 395214077Sgibbs 396214077Sgibbs/*------------------------------ Event Reception -----------------------------*/ 397214077Sgibbsstatic void 398214077Sgibbsxctrl_on_watch_event(struct xs_watch *watch, const char **vec, unsigned int len) 399214077Sgibbs{ 400244990Smarius const struct xctrl_shutdown_reason *reason; 401244990Smarius const struct xctrl_shutdown_reason *last_reason; 402214077Sgibbs char *result; 403214077Sgibbs int error; 404214077Sgibbs int result_len; 405214077Sgibbs 406214077Sgibbs error = xs_read(XST_NIL, "control", "shutdown", 407214077Sgibbs &result_len, (void **)&result); 408214077Sgibbs if (error != 0) 409214077Sgibbs return; 410214077Sgibbs 411214077Sgibbs reason = xctrl_shutdown_reasons; 412244990Smarius last_reason = reason + nitems(xctrl_shutdown_reasons); 413214077Sgibbs while (reason < last_reason) { 414214077Sgibbs 415214077Sgibbs if (!strcmp(result, reason->name)) { 416214077Sgibbs reason->handler(); 417214077Sgibbs break; 418214077Sgibbs } 419214077Sgibbs reason++; 420214077Sgibbs } 421214077Sgibbs 422214077Sgibbs free(result, M_XENSTORE); 423214077Sgibbs} 424214077Sgibbs 425214077Sgibbs/*------------------ Private Device Attachment Functions --------------------*/ 426214077Sgibbs/** 427214077Sgibbs * \brief Identify instances of this device type in the system. 428214077Sgibbs * 429214077Sgibbs * \param driver The driver performing this identify action. 430214077Sgibbs * \param parent The NewBus parent device for any devices this method adds. 431214077Sgibbs */ 432214077Sgibbsstatic void 433214077Sgibbsxctrl_identify(driver_t *driver __unused, device_t parent) 434214077Sgibbs{ 435214077Sgibbs /* 436214077Sgibbs * A single device instance for our driver is always present 437214077Sgibbs * in a system operating under Xen. 438214077Sgibbs */ 439214077Sgibbs BUS_ADD_CHILD(parent, 0, driver->name, 0); 440214077Sgibbs} 441214077Sgibbs 442214077Sgibbs/** 443214077Sgibbs * \brief Probe for the existance of the Xen Control device 444214077Sgibbs * 445214077Sgibbs * \param dev NewBus device_t for this Xen control instance. 446214077Sgibbs * 447214077Sgibbs * \return Always returns 0 indicating success. 448214077Sgibbs */ 449214077Sgibbsstatic int 450214077Sgibbsxctrl_probe(device_t dev) 451214077Sgibbs{ 452214077Sgibbs device_set_desc(dev, "Xen Control Device"); 453214077Sgibbs 454214077Sgibbs return (0); 455214077Sgibbs} 456214077Sgibbs 457214077Sgibbs/** 458214077Sgibbs * \brief Attach the Xen control device. 459214077Sgibbs * 460214077Sgibbs * \param dev NewBus device_t for this Xen control instance. 461214077Sgibbs * 462214077Sgibbs * \return On success, 0. Otherwise an errno value indicating the 463214077Sgibbs * type of failure. 464214077Sgibbs */ 465214077Sgibbsstatic int 466214077Sgibbsxctrl_attach(device_t dev) 467214077Sgibbs{ 468214077Sgibbs struct xctrl_softc *xctrl; 469214077Sgibbs 470214077Sgibbs xctrl = device_get_softc(dev); 471214077Sgibbs 472214077Sgibbs /* Activate watch */ 473214077Sgibbs xctrl->xctrl_watch.node = "control/shutdown"; 474214077Sgibbs xctrl->xctrl_watch.callback = xctrl_on_watch_event; 475222975Sgibbs xctrl->xctrl_watch.callback_data = (uintptr_t)xctrl; 476214077Sgibbs xs_register_watch(&xctrl->xctrl_watch); 477214077Sgibbs 478214077Sgibbs#ifndef XENHVM 479214077Sgibbs EVENTHANDLER_REGISTER(shutdown_final, xen_pv_shutdown_final, NULL, 480214077Sgibbs SHUTDOWN_PRI_LAST); 481214077Sgibbs#endif 482214077Sgibbs 483214077Sgibbs return (0); 484214077Sgibbs} 485214077Sgibbs 486214077Sgibbs/** 487214077Sgibbs * \brief Detach the Xen control device. 488214077Sgibbs * 489214077Sgibbs * \param dev NewBus device_t for this Xen control device instance. 490214077Sgibbs * 491214077Sgibbs * \return On success, 0. Otherwise an errno value indicating the 492214077Sgibbs * type of failure. 493214077Sgibbs */ 494214077Sgibbsstatic int 495214077Sgibbsxctrl_detach(device_t dev) 496214077Sgibbs{ 497214077Sgibbs struct xctrl_softc *xctrl; 498214077Sgibbs 499214077Sgibbs xctrl = device_get_softc(dev); 500214077Sgibbs 501214077Sgibbs /* Release watch */ 502214077Sgibbs xs_unregister_watch(&xctrl->xctrl_watch); 503214077Sgibbs 504214077Sgibbs return (0); 505214077Sgibbs} 506214077Sgibbs 507214077Sgibbs/*-------------------- Private Device Attachment Data -----------------------*/ 508214077Sgibbsstatic device_method_t xctrl_methods[] = { 509214077Sgibbs /* Device interface */ 510214077Sgibbs DEVMETHOD(device_identify, xctrl_identify), 511214077Sgibbs DEVMETHOD(device_probe, xctrl_probe), 512214077Sgibbs DEVMETHOD(device_attach, xctrl_attach), 513214077Sgibbs DEVMETHOD(device_detach, xctrl_detach), 514214077Sgibbs 515244990Smarius DEVMETHOD_END 516214077Sgibbs}; 517214077Sgibbs 518214077SgibbsDEFINE_CLASS_0(xctrl, xctrl_driver, xctrl_methods, sizeof(struct xctrl_softc)); 519214077Sgibbsdevclass_t xctrl_devclass; 520214077Sgibbs 521244990SmariusDRIVER_MODULE(xctrl, xenstore, xctrl_driver, xctrl_devclass, NULL, NULL); 522