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x86: convert to generic helpers for IPI function calls

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This converts x86, x86-64, and xen to use the new helpers for
smp_call_function() and friends, and adds support for
smp_call_function_single().

Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2008-06-26 11:21:54 +02:00
parent 3d44223327
commit 3b16cf8748
20 changed files with 125 additions and 380 deletions
Download patch file Download diff file Expand all files Collapse all files

133
arch/x86/xen/smp.c
View file

@ -36,27 +36,14 @@
#include "mmu.h"
static cpumask_t xen_cpu_initialized_map;
static DEFINE_PER_CPU(int, resched_irq) = -1;
static DEFINE_PER_CPU(int, callfunc_irq) = -1;
static DEFINE_PER_CPU(int, resched_irq);
static DEFINE_PER_CPU(int, callfunc_irq);
static DEFINE_PER_CPU(int, callfuncsingle_irq);
static DEFINE_PER_CPU(int, debug_irq) = -1;
/*
* Structure and data for smp_call_function(). This is designed to minimise
* static memory requirements. It also looks cleaner.
*/
static DEFINE_SPINLOCK(call_lock);
struct call_data_struct {
void (*func) (void *info);
void *info;
atomic_t started;
atomic_t finished;
int wait;
};
static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
static struct call_data_struct *call_data;
static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
/*
* Reschedule call back. Nothing to do,
@ -122,6 +109,17 @@ static int xen_smp_intr_init(unsigned int cpu)
goto fail;
per_cpu(debug_irq, cpu) = rc;
callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
cpu,
xen_call_function_single_interrupt,
IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
callfunc_name,
NULL);
if (rc < 0)
goto fail;
per_cpu(callfuncsingle_irq, cpu) = rc;
return 0;
fail:
@ -131,6 +129,9 @@ static int xen_smp_intr_init(unsigned int cpu)
unbind_from_irqhandler(per_cpu(callfunc_irq, cpu), NULL);
if (per_cpu(debug_irq, cpu) >= 0)
unbind_from_irqhandler(per_cpu(debug_irq, cpu), NULL);
if (per_cpu(callfuncsingle_irq, cpu) >= 0)
unbind_from_irqhandler(per_cpu(callfuncsingle_irq, cpu), NULL);
return rc;
}
@ -338,7 +339,6 @@ void xen_smp_send_reschedule(int cpu)
xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
}
static void xen_send_IPI_mask(cpumask_t mask, enum ipi_vector vector)
{
unsigned cpu;
@ -349,83 +349,42 @@ static void xen_send_IPI_mask(cpumask_t mask, enum ipi_vector vector)
xen_send_IPI_one(cpu, vector);
}
void xen_smp_send_call_function_ipi(cpumask_t mask)
{
int cpu;
xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
/* Make sure other vcpus get a chance to run if they need to. */
for_each_cpu_mask(cpu, mask) {
if (xen_vcpu_stolen(cpu)) {
HYPERVISOR_sched_op(SCHEDOP_yield, 0);
break;
}
}
}
void xen_smp_send_call_function_single_ipi(int cpu)
{
xen_send_IPI_mask(cpumask_of_cpu(cpu), XEN_CALL_FUNCTION_SINGLE_VECTOR);
}
static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
{
void (*func) (void *info) = call_data->func;
void *info = call_data->info;
int wait = call_data->wait;
/*
* Notify initiating CPU that I've grabbed the data and am
* about to execute the function
*/
mb();
atomic_inc(&call_data->started);
/*
* At this point the info structure may be out of scope unless wait==1
*/
irq_enter();
(*func)(info);
generic_smp_call_function_interrupt();
__get_cpu_var(irq_stat).irq_call_count++;
irq_exit();
if (wait) {
mb(); /* commit everything before setting finished */
atomic_inc(&call_data->finished);
}
return IRQ_HANDLED;
}
int xen_smp_call_function_mask(cpumask_t mask, void (*func)(void *),
void *info, int wait)
static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
{
struct call_data_struct data;
int cpus, cpu;
bool yield;
irq_enter();
generic_smp_call_function_single_interrupt();
__get_cpu_var(irq_stat).irq_call_count++;
irq_exit();
/* Holding any lock stops cpus from going down. */
spin_lock(&call_lock);
cpu_clear(smp_processor_id(), mask);
cpus = cpus_weight(mask);
if (!cpus) {
spin_unlock(&call_lock);
return 0;
}
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
data.func = func;
data.info = info;
atomic_set(&data.started, 0);
data.wait = wait;
if (wait)
atomic_set(&data.finished, 0);
call_data = &data;
mb(); /* write everything before IPI */
/* Send a message to other CPUs and wait for them to respond */
xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
/* Make sure other vcpus get a chance to run if they need to. */
yield = false;
for_each_cpu_mask(cpu, mask)
if (xen_vcpu_stolen(cpu))
yield = true;
if (yield)
HYPERVISOR_sched_op(SCHEDOP_yield, 0);
/* Wait for response */
while (atomic_read(&data.started) != cpus ||
(wait && atomic_read(&data.finished) != cpus))
cpu_relax();
spin_unlock(&call_lock);
return 0;
return IRQ_HANDLED;
}