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    Subject[Patch Part2 v4 06/31] x86, irq: Save destination CPU ID in irq_cfg
    Date
    Cache destination CPU APIC ID into struct irq_cfg when assigning vector
    for interrupt. Upper layer just needs to read the cached APIC ID instead
    of calling apic->cpu_mask_to_apicid_and(), it helps to hide APIC driver
    details from IOAPIC/HPET/MSI drivers..

    Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
    ---
    arch/x86/include/asm/hw_irq.h | 1 +
    arch/x86/kernel/apic/vector.c | 6 ++++++
    2 files changed, 7 insertions(+)

    diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
    index 7624fffc2822..3d51d74d6c01 100644
    --- a/arch/x86/include/asm/hw_irq.h
    +++ b/arch/x86/include/asm/hw_irq.h
    @@ -116,6 +116,7 @@ struct irq_data;
    struct irq_cfg {
    cpumask_var_t domain;
    cpumask_var_t old_domain;
    + unsigned int dest_apicid;
    u8 vector;
    u8 move_in_progress : 1;
    #ifdef CONFIG_IRQ_REMAP
    diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
    index 5ac840a4cc53..02cb5d386985 100644
    --- a/arch/x86/kernel/apic/vector.c
    +++ b/arch/x86/kernel/apic/vector.c
    @@ -188,6 +188,12 @@ next:
    }
    free_cpumask_var(tmp_mask);

    + if (!err) {
    + /* cache destination APIC IDs into cfg->dest_apicid */
    + err = apic->cpu_mask_to_apicid_and(mask, cfg->domain,
    + &cfg->dest_apicid);
    + }
    +
    return err;
    }

    --
    1.7.10.4


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