AuxXxilium/linux_dsm_epyc7002
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x86/irq: Save destination CPU ID in irq_cfg

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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>
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: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jiang Liu 2015-04-13 14:11:23 +08:00 committed by Thomas Gleixner
parent 646da63172
commit 5f0052f952
2 changed files with 7 additions and 0 deletions
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1
arch/x86/include/asm/hw_irq.h
View File

@ -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

6
arch/x86/kernel/apic/vector.c
View File

@ -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;
}