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Commit 959c870f authored by Feng Wu's avatar Feng Wu Committed by Thomas Gleixner
Browse files

iommu, x86: Provide irq_remapping_cap() interface 



Add a new interface irq_remapping_cap() to detect whether irq
remapping supports new features, such as VT-d Posted-Interrupts.

Export the function, so that KVM code can check this and use this
mechanism properly.

Signed-off-by: default avatarFeng Wu <feng.wu@intel.com>
Reviewed-by: default avatarJiang Liu <jiang.liu@linux.intel.com>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarJoerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org
Cc: dwmw2@infradead.org
Link: http://lkml.kernel.org/r/1433827237-3382-10-git-send-email-feng.wu@intel.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 3d9b98f4

arch/x86/include/asm/irq_remapping.h

+2 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ enum irq_remap_cap { 


#ifdef CONFIG_IRQ_REMAP



extern bool irq_remapping_cap(enum irq_remap_cap cap);

extern void set_irq_remapping_broken(void);

extern int irq_remapping_prepare(void);

extern int irq_remapping_enable(void);
@@ -64,6 +65,7 @@ struct vcpu_data { 


#else  /* CONFIG_IRQ_REMAP */



static inline bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; }

static inline void set_irq_remapping_broken(void) { }

static inline int irq_remapping_prepare(void) { return -ENODEV; }

static inline int irq_remapping_enable(void) { return -ENODEV; }

drivers/iommu/irq_remapping.c

+9 −0
Original line number Diff line number Diff line
@@ -81,6 +81,15 @@ void set_irq_remapping_broken(void) 
	irq_remap_broken = 1;

}



bool irq_remapping_cap(enum irq_remap_cap cap)

{

	if (!remap_ops || disable_irq_post)

		return 0;



	return (remap_ops->capability & (1 << cap));

}

EXPORT_SYMBOL_GPL(irq_remapping_cap);



int __init irq_remapping_prepare(void)

{

	if (disable_irq_remap)