| Current Path : /sys/amd64/compile/hs32/modules/usr/src/sys/modules/sound/driver/driver/@/dev/xen/control/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/sound/driver/driver/@/dev/xen/control/control.c |
/*-
* Copyright (c) 2010 Justin T. Gibbs, Spectra Logic Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
/*-
* PV suspend/resume support:
*
* Copyright (c) 2004 Christian Limpach.
* Copyright (c) 2004-2006,2008 Kip Macy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christian Limpach.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*-
* HVM suspend/resume support:
*
* Copyright (c) 2008 Citrix Systems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/xen/control/control.c 225706 2011-09-21 00:06:02Z gibbs $");
/**
* \file control.c
*
* \brief Device driver to repond to control domain events that impact
* this VM.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/disk.h>
#include <sys/fcntl.h>
#include <sys/filedesc.h>
#include <sys/kdb.h>
#include <sys/module.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/rman.h>
#include <sys/sched.h>
#include <sys/taskqueue.h>
#include <sys/types.h>
#include <sys/vnode.h>
#ifndef XENHVM
#include <sys/sched.h>
#include <sys/smp.h>
#endif
#include <geom/geom.h>
#include <machine/_inttypes.h>
#include <machine/xen/xen-os.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <xen/blkif.h>
#include <xen/evtchn.h>
#include <xen/gnttab.h>
#include <xen/xen_intr.h>
#include <xen/interface/event_channel.h>
#include <xen/interface/grant_table.h>
#include <xen/xenbus/xenbusvar.h>
#define NUM_ELEMENTS(x) (sizeof(x) / sizeof(*(x)))
/*--------------------------- Forward Declarations --------------------------*/
/** Function signature for shutdown event handlers. */
typedef void (xctrl_shutdown_handler_t)(void);
static xctrl_shutdown_handler_t xctrl_poweroff;
static xctrl_shutdown_handler_t xctrl_reboot;
static xctrl_shutdown_handler_t xctrl_suspend;
static xctrl_shutdown_handler_t xctrl_crash;
static xctrl_shutdown_handler_t xctrl_halt;
/*-------------------------- Private Data Structures -------------------------*/
/** Element type for lookup table of event name to handler. */
struct xctrl_shutdown_reason {
const char *name;
xctrl_shutdown_handler_t *handler;
};
/** Lookup table for shutdown event name to handler. */
static struct xctrl_shutdown_reason xctrl_shutdown_reasons[] = {
{ "poweroff", xctrl_poweroff },
{ "reboot", xctrl_reboot },
{ "suspend", xctrl_suspend },
{ "crash", xctrl_crash },
{ "halt", xctrl_halt },
};
struct xctrl_softc {
struct xs_watch xctrl_watch;
};
/*------------------------------ Event Handlers ------------------------------*/
static void
xctrl_poweroff()
{
shutdown_nice(RB_POWEROFF|RB_HALT);
}
static void
xctrl_reboot()
{
shutdown_nice(0);
}
#ifndef XENHVM
extern void xencons_suspend(void);
extern void xencons_resume(void);
/* Full PV mode suspension. */
static void
xctrl_suspend()
{
u_int cpuid;
int i, j, k, fpp;
unsigned long max_pfn, start_info_mfn;
EVENTHANDLER_INVOKE(power_suspend);
#ifdef SMP
struct thread *td;
cpuset_t map;
/*
* Bind us to CPU 0 and stop any other VCPUs.
*/
td = curthread;
thread_lock(td);
sched_bind(td, 0);
thread_unlock(td);
cpuid = PCPU_GET(cpuid);
KASSERT(cpuid == 0, ("xen_suspend: not running on cpu 0"));
map = all_cpus;
CPU_CLR(cpuid, &map);
CPU_NAND(&map, &stopped_cpus);
if (!CPU_EMPTY(&map))
stop_cpus(map);
#endif
/*
* Be sure to hold Giant across DEVICE_SUSPEND/RESUME since non-MPSAFE
* drivers need this.
*/
mtx_lock(&Giant);
if (DEVICE_SUSPEND(root_bus) != 0) {
mtx_unlock(&Giant);
printf("xen_suspend: device_suspend failed\n");
#ifdef SMP
if (!CPU_EMPTY(&map))
restart_cpus(map);
#endif
return;
}
mtx_unlock(&Giant);
local_irq_disable();
xencons_suspend();
gnttab_suspend();
max_pfn = HYPERVISOR_shared_info->arch.max_pfn;
void *shared_info = HYPERVISOR_shared_info;
HYPERVISOR_shared_info = NULL;
pmap_kremove((vm_offset_t) shared_info);
PT_UPDATES_FLUSH();
xen_start_info->store_mfn = MFNTOPFN(xen_start_info->store_mfn);
xen_start_info->console.domU.mfn = MFNTOPFN(xen_start_info->console.domU.mfn);
/*
* We'll stop somewhere inside this hypercall. When it returns,
* we'll start resuming after the restore.
*/
start_info_mfn = VTOMFN(xen_start_info);
pmap_suspend();
HYPERVISOR_suspend(start_info_mfn);
pmap_resume();
pmap_kenter_ma((vm_offset_t) shared_info, xen_start_info->shared_info);
HYPERVISOR_shared_info = shared_info;
HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
VTOMFN(xen_pfn_to_mfn_frame_list_list);
fpp = PAGE_SIZE/sizeof(unsigned long);
for (i = 0, j = 0, k = -1; i < max_pfn; i += fpp, j++) {
if ((j % fpp) == 0) {
k++;
xen_pfn_to_mfn_frame_list_list[k] =
VTOMFN(xen_pfn_to_mfn_frame_list[k]);
j = 0;
}
xen_pfn_to_mfn_frame_list[k][j] =
VTOMFN(&xen_phys_machine[i]);
}
HYPERVISOR_shared_info->arch.max_pfn = max_pfn;
gnttab_resume();
irq_resume();
local_irq_enable();
xencons_resume();
#ifdef CONFIG_SMP
for_each_cpu(i)
vcpu_prepare(i);
#endif
/*
* Only resume xenbus /after/ we've prepared our VCPUs; otherwise
* the VCPU hotplug callback can race with our vcpu_prepare
*/
mtx_lock(&Giant);
DEVICE_RESUME(root_bus);
mtx_unlock(&Giant);
#ifdef SMP
thread_lock(curthread);
sched_unbind(curthread);
thread_unlock(curthread);
if (!CPU_EMPTY(&map))
restart_cpus(map);
#endif
EVENTHANDLER_INVOKE(power_resume);
}
static void
xen_pv_shutdown_final(void *arg, int howto)
{
/*
* Inform the hypervisor that shutdown is complete.
* This is not necessary in HVM domains since Xen
* emulates ACPI in that mode and FreeBSD's ACPI
* support will request this transition.
*/
if (howto & (RB_HALT | RB_POWEROFF))
HYPERVISOR_shutdown(SHUTDOWN_poweroff);
else
HYPERVISOR_shutdown(SHUTDOWN_reboot);
}
#else
extern void xenpci_resume(void);
/* HVM mode suspension. */
static void
xctrl_suspend()
{
int suspend_cancelled;
EVENTHANDLER_INVOKE(power_suspend);
/*
* Be sure to hold Giant across DEVICE_SUSPEND/RESUME since non-MPSAFE
* drivers need this.
*/
mtx_lock(&Giant);
if (DEVICE_SUSPEND(root_bus)) {
mtx_unlock(&Giant);
printf("xen_suspend: device_suspend failed\n");
return;
}
mtx_unlock(&Giant);
/*
* Prevent any races with evtchn_interrupt() handler.
*/
disable_intr();
irq_suspend();
suspend_cancelled = HYPERVISOR_suspend(0);
if (suspend_cancelled)
irq_resume();
else
xenpci_resume();
/*
* Re-enable interrupts and put the scheduler back to normal.
*/
enable_intr();
/*
* FreeBSD really needs to add DEVICE_SUSPEND_CANCEL or
* similar.
*/
mtx_lock(&Giant);
if (!suspend_cancelled)
DEVICE_RESUME(root_bus);
mtx_unlock(&Giant);
EVENTHANDLER_INVOKE(power_resume);
}
#endif
static void
xctrl_crash()
{
panic("Xen directed crash");
}
static void
xctrl_halt()
{
shutdown_nice(RB_HALT);
}
/*------------------------------ Event Reception -----------------------------*/
static void
xctrl_on_watch_event(struct xs_watch *watch, const char **vec, unsigned int len)
{
struct xctrl_shutdown_reason *reason;
struct xctrl_shutdown_reason *last_reason;
char *result;
int error;
int result_len;
error = xs_read(XST_NIL, "control", "shutdown",
&result_len, (void **)&result);
if (error != 0)
return;
reason = xctrl_shutdown_reasons;
last_reason = reason + NUM_ELEMENTS(xctrl_shutdown_reasons);
while (reason < last_reason) {
if (!strcmp(result, reason->name)) {
reason->handler();
break;
}
reason++;
}
free(result, M_XENSTORE);
}
/*------------------ Private Device Attachment Functions --------------------*/
/**
* \brief Identify instances of this device type in the system.
*
* \param driver The driver performing this identify action.
* \param parent The NewBus parent device for any devices this method adds.
*/
static void
xctrl_identify(driver_t *driver __unused, device_t parent)
{
/*
* A single device instance for our driver is always present
* in a system operating under Xen.
*/
BUS_ADD_CHILD(parent, 0, driver->name, 0);
}
/**
* \brief Probe for the existance of the Xen Control device
*
* \param dev NewBus device_t for this Xen control instance.
*
* \return Always returns 0 indicating success.
*/
static int
xctrl_probe(device_t dev)
{
device_set_desc(dev, "Xen Control Device");
return (0);
}
/**
* \brief Attach the Xen control device.
*
* \param dev NewBus device_t for this Xen control instance.
*
* \return On success, 0. Otherwise an errno value indicating the
* type of failure.
*/
static int
xctrl_attach(device_t dev)
{
struct xctrl_softc *xctrl;
xctrl = device_get_softc(dev);
/* Activate watch */
xctrl->xctrl_watch.node = "control/shutdown";
xctrl->xctrl_watch.callback = xctrl_on_watch_event;
xctrl->xctrl_watch.callback_data = (uintptr_t)xctrl;
xs_register_watch(&xctrl->xctrl_watch);
#ifndef XENHVM
EVENTHANDLER_REGISTER(shutdown_final, xen_pv_shutdown_final, NULL,
SHUTDOWN_PRI_LAST);
#endif
return (0);
}
/**
* \brief Detach the Xen control device.
*
* \param dev NewBus device_t for this Xen control device instance.
*
* \return On success, 0. Otherwise an errno value indicating the
* type of failure.
*/
static int
xctrl_detach(device_t dev)
{
struct xctrl_softc *xctrl;
xctrl = device_get_softc(dev);
/* Release watch */
xs_unregister_watch(&xctrl->xctrl_watch);
return (0);
}
/*-------------------- Private Device Attachment Data -----------------------*/
static device_method_t xctrl_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, xctrl_identify),
DEVMETHOD(device_probe, xctrl_probe),
DEVMETHOD(device_attach, xctrl_attach),
DEVMETHOD(device_detach, xctrl_detach),
{ 0, 0 }
};
DEFINE_CLASS_0(xctrl, xctrl_driver, xctrl_methods, sizeof(struct xctrl_softc));
devclass_t xctrl_devclass;
DRIVER_MODULE(xctrl, xenstore, xctrl_driver, xctrl_devclass, 0, 0);