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Commit 8541186f authored by Feng Wu's avatar Feng Wu Committed by Thomas Gleixner
Browse files

iommu, x86: Implement irq_set_vcpu_affinity for intel_ir_chip 



Interrupt chip callback to set the VCPU affinity for posted interrupts.

[ tglx: Use the helper function to copy from the remap irte instead of
        open coding it. Massage the comment as well ]

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 avatarDavid Woodhouse <David.Woodhouse@intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: joro@8bytes.org
Cc: dwmw2@infradead.org
Link: http://lkml.kernel.org/r/1433827237-3382-5-git-send-email-feng.wu@intel.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent bf56027f

arch/x86/include/asm/irq_remapping.h

+5 −0
Original line number Diff line number Diff line
@@ -57,6 +57,11 @@ static inline struct irq_domain *arch_get_ir_parent_domain(void) 
	return x86_vector_domain;

}



struct vcpu_data {

	u64 pi_desc_addr;	/* Physical address of PI Descriptor */

	u32 vector;		/* Guest vector of the interrupt */

};



#else  /* CONFIG_IRQ_REMAP */



static inline void set_irq_remapping_broken(void) { }

drivers/iommu/intel_irq_remapping.c

+37 −0
Original line number Diff line number Diff line
@@ -1013,10 +1013,47 @@ static void intel_ir_compose_msi_msg(struct irq_data *irq_data, 
	*msg = ir_data->msi_entry;

}



static int intel_ir_set_vcpu_affinity(struct irq_data *data, void *info)

{

	struct intel_ir_data *ir_data = data->chip_data;

	struct vcpu_data *vcpu_pi_info = info;



	/* stop posting interrupts, back to remapping mode */

	if (!vcpu_pi_info) {

		modify_irte(&ir_data->irq_2_iommu, &ir_data->irte_entry);

	} else {

		struct irte irte_pi;



		/*

		 * We are not caching the posted interrupt entry. We

		 * copy the data from the remapped entry and modify

		 * the fields which are relevant for posted mode. The

		 * cached remapped entry is used for switching back to

		 * remapped mode.

		 */

		memset(&irte_pi, 0, sizeof(irte_pi));

		dmar_copy_shared_irte(&irte_pi, &ir_data->irte_entry);



		/* Update the posted mode fields */

		irte_pi.p_pst = 1;

		irte_pi.p_urgent = 0;

		irte_pi.p_vector = vcpu_pi_info->vector;

		irte_pi.pda_l = (vcpu_pi_info->pi_desc_addr >>

				(32 - PDA_LOW_BIT)) & ~(-1UL << PDA_LOW_BIT);

		irte_pi.pda_h = (vcpu_pi_info->pi_desc_addr >> 32) &

				~(-1UL << PDA_HIGH_BIT);



		modify_irte(&ir_data->irq_2_iommu, &irte_pi);

	}



	return 0;

}



static struct irq_chip intel_ir_chip = {

	.irq_ack = ir_ack_apic_edge,

	.irq_set_affinity = intel_ir_set_affinity,

	.irq_compose_msi_msg = intel_ir_compose_msi_msg,

	.irq_set_vcpu_affinity = intel_ir_set_vcpu_affinity,

};



static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,