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authorBoris Ostrovsky <boris.ostrovsky@oracle.com>2016-08-03 13:22:27 -0400
committerDavid Vrabel <david.vrabel@citrix.com>2016-08-24 18:44:40 +0100
commit5fc509bc2bd6dddd4107eaf90680cd76cfc2ffed (patch)
tree30265b703433375b2e86f1b96997b4b4971f7be6 /arch/x86/xen/smp.c
parentfa8410b355251fd30341662a40ac6b22d3e38468 (diff)
downloadlinux-5fc509bc2bd6dddd4107eaf90680cd76cfc2ffed.tar.bz2
xen/x86: Move irq allocation from Xen smp_op.cpu_up()
Commit ce0d3c0a6fb1 ("genirq: Revert sparse irq locking around __cpu_up() and move it to x86 for now") reverted irq locking introduced by commit a89941816726 ("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>
Diffstat (limited to 'arch/x86/xen/smp.c')
-rw-r--r--arch/x86/xen/smp.c45
1 files changed, 2 insertions, 43 deletions
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 0b4d04c8ab4d..137afbbd0590 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -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;