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xen/x86: Move irq allocation from Xen smp_op.cpu_up()

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Commit ce0d3c0a6f ("genirq: Revert sparse irq locking around
__cpu_up() and move it to x86 for now") reverted irq locking
introduced by commit a899418167 ("hotplug: Prevent alloc/free
of irq descriptors during cpu up/down") because of Xen allocating
irqs in both of its cpu_up ops.

We can move those allocations into CPU notifiers so that original
patch can be reinstated.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Boris Ostrovsky
2016-08-03 13:22:27 -04:00
committed by David Vrabel
parent fa8410b355
commit 5fc509bc2b
3 changed files with 63 additions and 56 deletions
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45
arch/x86/xen/smp.c
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@@ -115,7 +115,7 @@ asmlinkage __visible void cpu_bringup_and_idle(int cpu)
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
static void xen_smp_intr_free(unsigned int cpu)
void xen_smp_intr_free(unsigned int cpu)
{
if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
@@ -159,7 +159,7 @@ static void xen_smp_intr_free(unsigned int cpu)
per_cpu(xen_pmu_irq, cpu).name = NULL;
}
};
static int xen_smp_intr_init(unsigned int cpu)
int xen_smp_intr_init(unsigned int cpu)
{
int rc;
char *resched_name, *callfunc_name, *debug_name, *pmu_name;
@@ -475,8 +475,6 @@ static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
common_cpu_up(cpu, idle);
xen_setup_runstate_info(cpu);
xen_setup_timer(cpu);
xen_init_lock_cpu(cpu);
/*
* PV VCPUs are always successfully taken down (see 'while' loop
@@ -495,10 +493,6 @@ static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
xen_pmu_init(cpu);
rc = xen_smp_intr_init(cpu);
if (rc)
return rc;
rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL);
BUG_ON(rc);
@@ -769,47 +763,12 @@ static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
xen_init_lock_cpu(0);
}
static int xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
{
int rc;
/*
* This can happen if CPU was offlined earlier and
* offlining timed out in common_cpu_die().
*/
if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
xen_smp_intr_free(cpu);
xen_uninit_lock_cpu(cpu);
}
/*
* xen_smp_intr_init() needs to run before native_cpu_up()
* so that IPI vectors are set up on the booting CPU before
* it is marked online in native_cpu_up().
*/
rc = xen_smp_intr_init(cpu);
WARN_ON(rc);
if (!rc)
rc = native_cpu_up(cpu, tidle);
/*
* We must initialize the slowpath CPU kicker _after_ the native
* path has executed. If we initialized it before none of the
* unlocker IPI kicks would reach the booting CPU as the booting
* CPU had not set itself 'online' in cpu_online_mask. That mask
* is checked when IPIs are sent (on HVM at least).
*/
xen_init_lock_cpu(cpu);
return rc;
}
void __init xen_hvm_smp_init(void)
{
if (!xen_have_vector_callback)
return;
smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
smp_ops.cpu_up = xen_hvm_cpu_up;
smp_ops.cpu_die = xen_cpu_die;
smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;