Commit 8b271d57 authored by Julien Grall's avatar Julien Grall Committed by Stefano Stabellini
Browse files

arm/xen: Initialize event channels earlier 



Event channels driver needs to be initialized very early. Until now, Xen
initialization was done after all CPUs was bring up.

We can safely move the initialization to an early initcall.

Also use a cpu notifier to:
    - Register the VCPU when the CPU is prepared
    - Enable event channel IRQ when the CPU is running

Signed-off-by: default avatarJulien Grall <julien.grall@linaro.org>
Signed-off-by: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
parent c9f6e997

arch/arm/xen/enlighten.c

+44 −27
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/of_address.h>

#include <linux/cpuidle.h>

#include <linux/cpufreq.h>

#include <linux/cpu.h>



#include <linux/mm.h>
@@ -154,7 +155,7 @@ int xen_unmap_domain_mfn_range(struct vm_area_struct *vma, 
}

EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);



static void __init xen_percpu_init(void *unused)

static void xen_percpu_init(void)

{

	struct vcpu_register_vcpu_info info;

	struct vcpu_info *vcpup;
@@ -193,6 +194,31 @@ static void xen_power_off(void) 
		BUG();

}



static int xen_cpu_notification(struct notifier_block *self,

				unsigned long action,

				void *hcpu)

{

	switch (action) {

	case CPU_STARTING:

		xen_percpu_init();

		break;

	default:

		break;

	}



	return NOTIFY_OK;

}



static struct notifier_block xen_cpu_notifier = {

	.notifier_call = xen_cpu_notification,

};



static irqreturn_t xen_arm_callback(int irq, void *arg)

{

	xen_hvm_evtchn_do_upcall();

	return IRQ_HANDLED;

}



/*

 * see Documentation/devicetree/bindings/arm/xen.txt for the

 * documentation of the Xen Device Tree format.
@@ -229,6 +255,10 @@ static int __init xen_guest_init(void) 
	xen_events_irq = irq_of_parse_and_map(node, 0);

	pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",

			version, xen_events_irq, (grant_frames >> PAGE_SHIFT));



	if (xen_events_irq < 0)

		return -ENODEV;



	xen_domain_type = XEN_HVM_DOMAIN;



	xen_setup_features();
@@ -281,9 +311,21 @@ static int __init xen_guest_init(void) 
	disable_cpuidle();

	disable_cpufreq();



	xen_init_IRQ();



	if (request_percpu_irq(xen_events_irq, xen_arm_callback,

			       "events", &xen_vcpu)) {

		pr_err("Error request IRQ %d\n", xen_events_irq);

		return -EINVAL;

	}



	xen_percpu_init();



	register_cpu_notifier(&xen_cpu_notifier);



	return 0;

}

core_initcall(xen_guest_init);

early_initcall(xen_guest_init);



static int __init xen_pm_init(void)

{
@@ -297,31 +339,6 @@ static int __init xen_pm_init(void) 
}

late_initcall(xen_pm_init);



static irqreturn_t xen_arm_callback(int irq, void *arg)

{

	xen_hvm_evtchn_do_upcall();

	return IRQ_HANDLED;

}



static int __init xen_init_events(void)

{

	if (!xen_domain() || xen_events_irq < 0)

		return -ENODEV;



	xen_init_IRQ();



	if (request_percpu_irq(xen_events_irq, xen_arm_callback,

			"events", &xen_vcpu)) {

		pr_err("Error requesting IRQ %d\n", xen_events_irq);

		return -EINVAL;

	}



	on_each_cpu(xen_percpu_init, NULL, 0);



	return 0;

}

postcore_initcall(xen_init_events);



/* In the hypervisor.S file. */

EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);

EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);

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