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iommu, x86: Save the mode (posted or remapped) of an IRTE
Add a new field to struct irq_2_iommu, which captures whether the associated IRTE is in posted mode or remapped mode. We update this field when the IRTE is written into the table. Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Feng Wu <feng.wu@intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Joerg 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/1433827237-3382-6-git-send-email-feng.wu@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -18,6 +18,11 @@
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#include "irq_remapping.h"
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enum irq_mode {
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IRQ_REMAPPING,
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IRQ_POSTING,
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};
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struct ioapic_scope {
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struct intel_iommu *iommu;
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unsigned int id;
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@ -37,6 +42,7 @@ struct irq_2_iommu {
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u16 irte_index;
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u16 sub_handle;
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u8 irte_mask;
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enum irq_mode mode;
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};
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struct intel_ir_data {
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@ -104,6 +110,7 @@ static int alloc_irte(struct intel_iommu *iommu, int irq,
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irq_iommu->irte_index = index;
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irq_iommu->sub_handle = 0;
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irq_iommu->irte_mask = mask;
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irq_iommu->mode = IRQ_REMAPPING;
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}
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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@ -144,6 +151,9 @@ static int modify_irte(struct irq_2_iommu *irq_iommu,
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__iommu_flush_cache(iommu, irte, sizeof(*irte));
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rc = qi_flush_iec(iommu, index, 0);
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/* Update iommu mode according to the IRTE mode */
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irq_iommu->mode = irte->pst ? IRQ_POSTING : IRQ_REMAPPING;
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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return rc;
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