x86/vector: Store the single CPU targets in apic data

Now that the interrupt affinities are targeted at single CPUs storing them
in a cpumask is overkill. Store them in a dedicated variable.

This does not yet remove the domain cpumasks because the current allocator
relies on them. Preparatory change for the allocator rework.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Yu Chen <yu.c.chen@intel.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Rui Zhang <rui.zhang@intel.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Len Brown <lenb@kernel.org>
Link: https://lkml.kernel.org/r/20170913213154.544867277@linutronix.de

diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index a7f7c3730a0948d6032d6cfccff8e1f51e64e365..7a9e0c6dd75633816353ceddab6b61a8bf9d9cb7 100644 (file)
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -23,6 +23,8 @@
 
 struct apic_chip_data {
        struct irq_cfg          cfg;
+       unsigned int            cpu;
+       unsigned int            prev_cpu;
        cpumask_var_t           domain;
        cpumask_var_t           old_domain;
        u8                      move_in_progress : 1;
@@ -214,6 +216,7 @@ update:
        cpumask_and(d->old_domain, d->old_domain, cpu_online_mask);
        d->move_in_progress = !cpumask_empty(d->old_domain);
        d->cfg.old_vector = d->move_in_progress ? d->cfg.vector : 0;
+       d->prev_cpu = d->cpu;
        d->cfg.vector = vector;
        cpumask_copy(d->domain, vector_cpumask);
 success:
@@ -228,6 +231,7 @@ success:
        cpumask_and(vector_searchmask, vector_searchmask, mask);
        BUG_ON(apic->cpu_mask_to_apicid(vector_searchmask, irqd,
                                        &d->cfg.dest_apicid));
+       d->cpu = cpumask_first(vector_searchmask);
        return 0;
 }
 
@@ -428,6 +432,7 @@ static void __init init_legacy_irqs(void)
 
                apicd->cfg.vector = ISA_IRQ_VECTOR(i);
                cpumask_copy(apicd->domain, cpumask_of(0));
+               apicd->cpu = 0;
                irq_set_chip_data(i, apicd);
        }
 }