linux-kernel - [v8 3/9] iommu, x86: Implement irq_set_vcpu_affinity for intel_ir

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Message-Id: <1432699544-17444-4-git-send-email-feng.wu@intel.com>
Date:	Wed, 27 May 2015 12:05:38 +0800
From:	Feng Wu <feng.wu@...el.com>
To:	joro@...tes.org, dwmw2@...radead.org
Cc:	tglx@...utronix.de, jiang.liu@...ux.intel.com,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Feng Wu <feng.wu@...el.com>
Subject: [v8 3/9] iommu, x86: Implement irq_set_vcpu_affinity for intel_ir_chip

Implement irq_set_vcpu_affinity for intel_ir_chip.

Signed-off-by: Feng Wu <feng.wu@...el.com>
Reviewed-by: Jiang Liu <jiang.liu@...ux.intel.com>
Acked-by: David Woodhouse <David.Woodhouse@...el.com>
---
 arch/x86/include/asm/irq_remapping.h |  5 ++++
 drivers/iommu/intel_irq_remapping.c  | 46 ++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index 0953723..202e040 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -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) { }
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 8fad71c..1955b09 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -42,6 +42,7 @@ struct irq_2_iommu {
 struct intel_ir_data {
 	struct irq_2_iommu			irq_2_iommu;
 	struct irte				irte_entry;
+	struct irte				irte_pi_entry;
 	union {
 		struct msi_msg			msi_entry;
 	};
@@ -1013,10 +1014,55 @@ 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 *vcpu_info)
+{
+	struct intel_ir_data *ir_data = data->chip_data;
+	struct irte *irte_pi = &ir_data->irte_pi_entry;
+	struct vcpu_data *vcpu_pi_info;
+
+	/* stop posting interrupts, back to remapping mode */
+	if (!vcpu_info) {
+		modify_irte(&ir_data->irq_2_iommu, &ir_data->irte_entry);
+	} else {
+		vcpu_pi_info = (struct vcpu_data *)vcpu_info;
+
+		/*
+		 * "ir_data->irte_entry" saves the remapped format of IRTE,
+		 * which being a cached irte is still updated when setting
+		 * the affinity even when we are in posted mode. So this make
+		 * it possible to switch back to remapped mode from posted mode,
+		 * we can just set "ir_data->irte_entry" to hardware for that
+		 * purpose. Here we store the posted format of IRTE in another
+		 * new member "ir_data->irte_pi_entry" to not corrupt
+		 * "ir_data->irte_entry".
+		 */
+		memcpy(irte_pi, &ir_data->irte_entry, sizeof(struct irte));
+
+		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);
+
+		irte_pi->p_res0 = 0;
+		irte_pi->p_res1 = 0;
+		irte_pi->p_res2 = 0;
+		irte_pi->p_res3 = 0;
+
+		irte_pi->p_pst = 1;
+
+		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,
-- 
2.1.0

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