void xenbus_resume(void)
{
	xb_init_comms();
	xs_resume();
	bus_for_each_dev(&xenbus_frontend.bus, NULL, NULL, resume_dev);
	xenbus_backend_resume(resume_dev);
}
Beispiel #2
0
void xenbus_resume(void)
{
	xb_init_comms();
	xs_resume();
	if (!xenbus_frontend.error)
		bus_for_each_dev(&xenbus_frontend.bus, NULL, NULL, resume_dev);
	xenbus_backend_resume(resume_dev);
	xen_unplug_emulated_devices();
}
Beispiel #3
0
void xenbus_resume(void)
{
	xb_init_comms();
	xs_resume();
        if (!xenbus_frontend.error)
		bus_for_each_dev(&xenbus_frontend.bus, NULL, NULL, resume_dev);
#ifdef CONFIG_XEN
	bus_for_each_dev(&xenbus_backend.bus, NULL, NULL, resume_dev);
#endif
}
Beispiel #4
0
static long xenbus_alloc(domid_t domid)
{
	struct evtchn_alloc_unbound arg;
	int err = -EEXIST;

	xs_suspend();

	/* If xenstored_ready is nonzero, that means we have already talked to
	 * xenstore and set up watches. These watches will be restored by
	 * xs_resume, but that requires communication over the port established
	 * below that is not visible to anyone until the ioctl returns.
	 *
	 * This can be resolved by splitting the ioctl into two parts
	 * (postponing the resume until xenstored is active) but this is
	 * unnecessarily complex for the intended use where xenstored is only
	 * started once - so return -EEXIST if it's already running.
	 */
	if (xenstored_ready)
		goto out_err;

	gnttab_grant_foreign_access_ref(GNTTAB_RESERVED_XENSTORE, domid,
			virt_to_gfn(xen_store_interface), 0 /* writable */);

	arg.dom = DOMID_SELF;
	arg.remote_dom = domid;

	err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound, &arg);
	if (err)
		goto out_err;

	if (xen_store_evtchn > 0)
		xb_deinit_comms();

	xen_store_evtchn = arg.port;

	xs_resume();

	return arg.port;

 out_err:
	xs_suspend_cancel();
	return err;
}
Beispiel #5
0
static void do_suspend(void)
{
	int err;
	struct suspend_info si;

	shutting_down = SHUTDOWN_SUSPEND;

#ifdef CONFIG_PREEMPT
	/* If the kernel is preemptible, we need to freeze all the processes
	   to prevent them from being in the middle of a pagetable update
	   during suspend. */
	err = freeze_processes();
	if (err) {
		pr_err("%s: freeze failed %d\n", __func__, err);
		goto out;
	}
#endif

	err = dpm_suspend_start(PMSG_FREEZE);
	if (err) {
		pr_err("%s: dpm_suspend_start %d\n", __func__, err);
		goto out_thaw;
	}

	printk(KERN_DEBUG "suspending xenstore...\n");
	xs_suspend();

	err = dpm_suspend_end(PMSG_FREEZE);
	if (err) {
		pr_err("dpm_suspend_end failed: %d\n", err);
		si.cancelled = 0;
		goto out_resume;
	}

	si.cancelled = 1;

	err = stop_machine(xen_suspend, &si, cpumask_of(0));

	/* Resume console as early as possible. */
	if (!si.cancelled)
		xen_console_resume();

	raw_notifier_call_chain(&xen_resume_notifier, 0, NULL);

	dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

	if (err) {
		pr_err("failed to start xen_suspend: %d\n", err);
		si.cancelled = 1;
	}

out_resume:
	if (!si.cancelled) {
		xen_arch_resume();
		xs_resume();
	} else
		xs_suspend_cancel();

	dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

out_thaw:
#ifdef CONFIG_PREEMPT
	thaw_processes();
out:
#endif
	shutting_down = SHUTDOWN_INVALID;
}
Beispiel #6
0
static void do_suspend(void)
{
	int err;
	struct suspend_info si;

	shutting_down = SHUTDOWN_SUSPEND;

#ifdef CONFIG_PREEMPT
	/* If the kernel is preemptible, we need to freeze all the processes
	   to prevent them from being in the middle of a pagetable update
	   during suspend. */
	err = freeze_processes();
	if (err) {
		printk(KERN_ERR "xen suspend: freeze failed %d\n", err);
		goto out;
	}
#endif

	err = dpm_suspend_start(PMSG_FREEZE);
	if (err) {
		printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err);
		goto out_thaw;
	}

	printk(KERN_DEBUG "suspending xenstore...\n");
	xs_suspend();

	err = dpm_suspend_noirq(PMSG_FREEZE);
	if (err) {
		printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err);
		goto out_resume;
	}

	si.cancelled = 1;

	if (xen_hvm_domain()) {
		si.arg = 0UL;
		si.pre = NULL;
		si.post = &xen_hvm_post_suspend;
	} else {
		si.arg = virt_to_mfn(xen_start_info);
		si.pre = &xen_pre_suspend;
		si.post = &xen_post_suspend;
	}

	err = stop_machine(xen_suspend, &si, cpumask_of(0));

	dpm_resume_noirq(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

	if (err) {
		printk(KERN_ERR "failed to start xen_suspend: %d\n", err);
		si.cancelled = 1;
	}

out_resume:
	if (!si.cancelled) {
		xen_arch_resume();
		xs_resume();
	} else
		xs_suspend_cancel();

	dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

	/* Make sure timer events get retriggered on all CPUs */
	clock_was_set();

out_thaw:
#ifdef CONFIG_PREEMPT
	thaw_processes();
out:
#endif
	shutting_down = SHUTDOWN_INVALID;
}
static void do_suspend(void)
{
	int err;
	struct suspend_info si;

	shutting_down = SHUTDOWN_SUSPEND;

	err = freeze_processes();
	if (err) {
		pr_err("%s: freeze failed %d\n", __func__, err);
		goto out;
	}

	err = dpm_suspend_start(PMSG_FREEZE);
	if (err) {
		pr_err("%s: dpm_suspend_start %d\n", __func__, err);
		goto out_thaw;
	}

	printk(KERN_DEBUG "suspending xenstore...\n");
	xs_suspend();

	err = dpm_suspend_end(PMSG_FREEZE);
	if (err) {
		pr_err("dpm_suspend_end failed: %d\n", err);
		si.cancelled = 0;
		goto out_resume;
	}

	si.cancelled = 1;

	if (xen_hvm_domain()) {
		si.arg = 0UL;
		si.pre = NULL;
		si.post = &xen_hvm_post_suspend;
	} else {
		si.arg = virt_to_mfn(xen_start_info);
		si.pre = &xen_pre_suspend;
		si.post = &xen_post_suspend;
	}

	err = stop_machine(xen_suspend, &si, cpumask_of(0));

	dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

	if (err) {
		pr_err("failed to start xen_suspend: %d\n", err);
		si.cancelled = 1;
	}

out_resume:
	if (!si.cancelled) {
		xen_arch_resume();
		xs_resume();
	} else
		xs_suspend_cancel();

	dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

out_thaw:
	thaw_processes();
out:
	shutting_down = SHUTDOWN_INVALID;
}
Beispiel #8
0
static void do_suspend(void)
{
	int err;
	struct suspend_info si;

	shutting_down = SHUTDOWN_SUSPEND;

	err = freeze_processes();
	if (err) {
		pr_err("%s: freeze processes failed %d\n", __func__, err);
		goto out;
	}

	err = freeze_kernel_threads();
	if (err) {
		pr_err("%s: freeze kernel threads failed %d\n", __func__, err);
		goto out_thaw;
	}

	err = dpm_suspend_start(PMSG_FREEZE);
	if (err) {
		pr_err("%s: dpm_suspend_start %d\n", __func__, err);
		goto out_thaw;
	}

	printk(KERN_DEBUG "suspending xenstore...\n");
	xs_suspend();

	err = dpm_suspend_end(PMSG_FREEZE);
	if (err) {
		pr_err("dpm_suspend_end failed: %d\n", err);
		si.cancelled = 0;
		goto out_resume;
	}

	xen_arch_suspend();

	si.cancelled = 1;

	err = stop_machine(xen_suspend, &si, cpumask_of(0));

	/* Resume console as early as possible. */
	if (!si.cancelled)
		xen_console_resume();

	raw_notifier_call_chain(&xen_resume_notifier, 0, NULL);

	dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

	if (err) {
		pr_err("failed to start xen_suspend: %d\n", err);
		si.cancelled = 1;
	}

	xen_arch_resume();

out_resume:
	if (!si.cancelled)
		xs_resume();
	else
		xs_suspend_cancel();

	dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

out_thaw:
	thaw_processes();
out:
	shutting_down = SHUTDOWN_INVALID;
}
Beispiel #9
0
static void do_suspend(void)
{
    int err;
    int cancelled = 1;

    shutting_down = SHUTDOWN_SUSPEND;

    err = stop_machine_create();
    if (err) {
        printk(KERN_ERR "xen suspend: failed to setup stop_machine %d\n", err);
        goto out;
    }

#ifdef CONFIG_PREEMPT
    /* If the kernel is preemptible, we need to freeze all the processes
       to prevent them from being in the middle of a pagetable update
       during suspend. */
    err = freeze_processes();
    if (err) {
        printk(KERN_ERR "xen suspend: freeze failed %d\n", err);
        goto out_destroy_sm;
    }
#endif

    err = dpm_suspend_start(PMSG_SUSPEND);
    if (err) {
        printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err);
        goto out_thaw;
    }

    printk(KERN_DEBUG "suspending xenstore...\n");
    xs_suspend();

    err = dpm_suspend_noirq(PMSG_SUSPEND);
    if (err) {
        printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err);
        goto out_resume;
    }

    err = stop_machine(xen_suspend, &cancelled, cpumask_of(0));

    dpm_resume_noirq(PMSG_RESUME);

    if (err) {
        printk(KERN_ERR "failed to start xen_suspend: %d\n", err);
        cancelled = 1;
    }

out_resume:
    if (!cancelled) {
        xen_arch_resume();
        xs_resume();
    } else
        xs_suspend_cancel();

    dpm_resume_end(PMSG_RESUME);

    /* Make sure timer events get retriggered on all CPUs */
    clock_was_set();

out_thaw:
#ifdef CONFIG_PREEMPT
    thaw_processes();

out_destroy_sm:
#endif
    stop_machine_destroy();

out:
    shutting_down = SHUTDOWN_INVALID;
}
static int
xenbus_resume(device_t dev)
{
	device_t *kids;
	struct xenbus_device_ivars *ivars;
	int i, count, error;
	char *statepath;

	xb_init_comms();
	xs_resume();

	/*
	 * We must re-examine each device and find the new path for
	 * its backend.
	 */
	if (device_get_children(dev, &kids, &count) == 0) {
		for (i = 0; i < count; i++) {
			if (device_get_state(kids[i]) == DS_NOTPRESENT)
				continue;

			ivars = device_get_ivars(kids[i]);

			unregister_xenbus_watch(
				&ivars->xd_otherend_watch);
			ivars->xd_state = XenbusStateInitialising;

			/*
			 * Find the new backend details and
			 * re-register our watch.
			 */
			free(ivars->xd_otherend_path, M_DEVBUF);
			error = xenbus_gather(XBT_NIL, ivars->xd_node,
			    "backend-id", "%i", &ivars->xd_otherend_id,
			    "backend", NULL, &ivars->xd_otherend_path,
			    NULL);
			if (error)
				return (error);

			DEVICE_RESUME(kids[i]);

			statepath = malloc(strlen(ivars->xd_otherend_path)
			    + strlen("/state") + 1, M_DEVBUF, M_WAITOK);
			sprintf(statepath, "%s/state", ivars->xd_otherend_path);

			free(ivars->xd_otherend_watch.node, M_DEVBUF);
			ivars->xd_otherend_watch.node = statepath;
			register_xenbus_watch(
				&ivars->xd_otherend_watch);

#if 0
			/*
			 * Can't do this yet since we are running in
			 * the xenwatch thread and if we sleep here,
			 * we will stop delivering watch notifications
			 * and the device will never come back online.
			 */
			sx_xlock(&ivars->xd_lock);
			while (ivars->xd_state != XenbusStateClosed
			    && ivars->xd_state != XenbusStateConnected)
				sx_sleep(&ivars->xd_state, &ivars->xd_lock,
				    0, "xdresume", 0);
			sx_xunlock(&ivars->xd_lock);
#endif
		}
		free(kids, M_TEMP);
	}

	return (0);
}