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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: Feng Wu <feng.wu@intel.com> Reviewed-by: Jiang Liu <jiang.liu@linux.intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: David 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: Thomas Gleixner <tglx@linutronix.de>
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@ -57,6 +57,11 @@ static inline struct irq_domain *arch_get_ir_parent_domain(void)
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return x86_vector_domain;
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}
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struct vcpu_data {
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u64 pi_desc_addr; /* Physical address of PI Descriptor */
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u32 vector; /* Guest vector of the interrupt */
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};
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#else /* CONFIG_IRQ_REMAP */
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static inline void set_irq_remapping_broken(void) { }
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@ -1013,10 +1013,47 @@ static void intel_ir_compose_msi_msg(struct irq_data *irq_data,
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*msg = ir_data->msi_entry;
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}
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static int intel_ir_set_vcpu_affinity(struct irq_data *data, void *info)
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{
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struct intel_ir_data *ir_data = data->chip_data;
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struct vcpu_data *vcpu_pi_info = info;
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/* stop posting interrupts, back to remapping mode */
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if (!vcpu_pi_info) {
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modify_irte(&ir_data->irq_2_iommu, &ir_data->irte_entry);
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} else {
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struct irte irte_pi;
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/*
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* We are not caching the posted interrupt entry. We
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* copy the data from the remapped entry and modify
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* the fields which are relevant for posted mode. The
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* cached remapped entry is used for switching back to
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* remapped mode.
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*/
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memset(&irte_pi, 0, sizeof(irte_pi));
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dmar_copy_shared_irte(&irte_pi, &ir_data->irte_entry);
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/* Update the posted mode fields */
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irte_pi.p_pst = 1;
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irte_pi.p_urgent = 0;
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irte_pi.p_vector = vcpu_pi_info->vector;
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irte_pi.pda_l = (vcpu_pi_info->pi_desc_addr >>
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(32 - PDA_LOW_BIT)) & ~(-1UL << PDA_LOW_BIT);
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irte_pi.pda_h = (vcpu_pi_info->pi_desc_addr >> 32) &
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~(-1UL << PDA_HIGH_BIT);
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modify_irte(&ir_data->irq_2_iommu, &irte_pi);
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}
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return 0;
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}
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static struct irq_chip intel_ir_chip = {
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.irq_ack = ir_ack_apic_edge,
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.irq_set_affinity = intel_ir_set_affinity,
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.irq_compose_msi_msg = intel_ir_compose_msi_msg,
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.irq_set_vcpu_affinity = intel_ir_set_vcpu_affinity,
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};
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static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,
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