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Commit 5f0052f9 authored by Jiang Liu's avatar Jiang Liu Committed by Thomas Gleixner
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x86/irq: Save destination CPU ID in irq_cfg 



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: default avatarJiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: David Cohen <david.a.cohen@linux.intel.com>
Cc: Sander Eikelenboom <linux@eikelenboom.it>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Link: http://lkml.kernel.org/r/1428905519-23704-2-git-send-email-jiang.liu@linux.intel.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 646da631

arch/x86/include/asm/hw_irq.h

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/x86/kernel/apic/vector.c

+6 −0
Original line number Diff line number Diff line
@@ -188,6 +188,12 @@ __assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask) 
	}

	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;

}