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Commit 3d9b98f4 authored by Feng Wu's avatar Feng Wu Committed by Thomas Gleixner
Browse files

iommu, x86: Setup Posted-Interrupts capability for Intel iommu 



Set Posted-Interrupts capability for Intel iommu when Interrupt
Remapping is enabled, clear it when disabled.

Signed-off-by: default avatarFeng Wu <feng.wu@intel.com>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarJoerg Roedel <joro@8bytes.org>
Cc: jiang.liu@linux.intel.com
Cc: iommu@lists.linux-foundation.org
Cc: dwmw2@infradead.org
Link: http://lkml.kernel.org/r/1433827237-3382-9-git-send-email-feng.wu@intel.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 07c09787

drivers/iommu/intel_irq_remapping.c

+30 −0
Original line number Diff line number Diff line
@@ -581,6 +581,26 @@ static int __init intel_prepare_irq_remapping(void) 
	return -ENODEV;

}



/*

 * Set Posted-Interrupts capability.

 */

static inline void set_irq_posting_cap(void)

{

	struct dmar_drhd_unit *drhd;

	struct intel_iommu *iommu;



	if (!disable_irq_post) {

		intel_irq_remap_ops.capability |= 1 << IRQ_POSTING_CAP;



		for_each_iommu(iommu, drhd)

			if (!cap_pi_support(iommu->cap)) {

				intel_irq_remap_ops.capability &=

						~(1 << IRQ_POSTING_CAP);

				break;

			}

	}

}



static int __init intel_enable_irq_remapping(void)

{

	struct dmar_drhd_unit *drhd;
@@ -656,6 +676,8 @@ static int __init intel_enable_irq_remapping(void) 


	irq_remapping_enabled = 1;



	set_irq_posting_cap();



	pr_info("Enabled IRQ remapping in %s mode\n", eim ? "x2apic" : "xapic");



	return eim ? IRQ_REMAP_X2APIC_MODE : IRQ_REMAP_XAPIC_MODE;
@@ -856,6 +878,12 @@ static void disable_irq_remapping(void) 


		iommu_disable_irq_remapping(iommu);

	}



	/*

	 * Clear Posted-Interrupts capability.

	 */

	if (!disable_irq_post)

		intel_irq_remap_ops.capability &= ~(1 << IRQ_POSTING_CAP);

}



static int reenable_irq_remapping(int eim)
@@ -883,6 +911,8 @@ static int reenable_irq_remapping(int eim) 
	if (!setup)

		goto error;



	set_irq_posting_cap();



	return 0;



error:

drivers/iommu/irq_remapping.c

+2 −0
Original line number Diff line number Diff line
@@ -22,6 +22,8 @@ int irq_remap_broken; 
int disable_sourceid_checking;

int no_x2apic_optout;



int disable_irq_post = 1;



static int disable_irq_remap;

static struct irq_remap_ops *remap_ops;

drivers/iommu/irq_remapping.h

+3 −0
Original line number Diff line number Diff line
@@ -34,6 +34,8 @@ extern int disable_sourceid_checking; 
extern int no_x2apic_optout;

extern int irq_remapping_enabled;



extern int disable_irq_post;



struct irq_remap_ops {

	/* The supported capabilities */

	int capability;
@@ -69,6 +71,7 @@ extern void ir_ack_apic_edge(struct irq_data *data); 


#define irq_remapping_enabled 0

#define irq_remap_broken      0

#define disable_irq_post      1



#endif /* CONFIG_IRQ_REMAP */