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Commit 1ff2b0c3 authored by Lin Ming's avatar Lin Ming Committed by Konrad Rzeszutek Wilk
Browse files

xen: implement IRQ_WORK_VECTOR handler 



Signed-off-by: default avatarLin Ming <mlin@ss.pku.edu.cn>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent f447d56d

arch/x86/include/asm/xen/events.h

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ enum ipi_vector { 
	XEN_CALL_FUNCTION_VECTOR,

	XEN_CALL_FUNCTION_SINGLE_VECTOR,

	XEN_SPIN_UNLOCK_VECTOR,

	XEN_IRQ_WORK_VECTOR,



	XEN_NR_IPIS,

};

arch/x86/xen/smp.c

+30 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/err.h>

#include <linux/slab.h>

#include <linux/smp.h>

#include <linux/irq_work.h>



#include <asm/paravirt.h>

#include <asm/desc.h>
@@ -41,10 +42,12 @@ cpumask_var_t xen_cpu_initialized_map; 
static DEFINE_PER_CPU(int, xen_resched_irq);

static DEFINE_PER_CPU(int, xen_callfunc_irq);

static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);

static DEFINE_PER_CPU(int, xen_irq_work);

static DEFINE_PER_CPU(int, xen_debug_irq) = -1;



static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);

static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);

static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);



/*

 * Reschedule call back.
@@ -143,6 +146,17 @@ static int xen_smp_intr_init(unsigned int cpu) 
		goto fail;

	per_cpu(xen_callfuncsingle_irq, cpu) = rc;



	callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);

	rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,

				    cpu,

				    xen_irq_work_interrupt,

				    IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,

				    callfunc_name,

				    NULL);

	if (rc < 0)

		goto fail;

	per_cpu(xen_irq_work, cpu) = rc;



	return 0;



 fail:
@@ -155,6 +169,8 @@ static int xen_smp_intr_init(unsigned int cpu) 
	if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)

		unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),

				       NULL);

	if (per_cpu(xen_irq_work, cpu) >= 0)

		unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);



	return rc;

}
@@ -509,6 +525,9 @@ static inline int xen_map_vector(int vector) 
	case CALL_FUNCTION_SINGLE_VECTOR:

		xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;

		break;

	case IRQ_WORK_VECTOR:

		xen_vector = XEN_IRQ_WORK_VECTOR;

		break;

	default:

		xen_vector = -1;

		printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
@@ -588,6 +607,16 @@ static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id) 
	return IRQ_HANDLED;

}



static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)

{

	irq_enter();

	irq_work_run();

	inc_irq_stat(apic_irq_work_irqs);

	irq_exit();



	return IRQ_HANDLED;

}



static const struct smp_ops xen_smp_ops __initconst = {

	.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,

	.smp_prepare_cpus = xen_smp_prepare_cpus,
@@ -634,6 +663,7 @@ static void xen_hvm_cpu_die(unsigned int cpu) 
	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);

	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);

	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);

	unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);

	native_cpu_die(cpu);

}