[v8 4/9] iommu, x86: Save the mode (posted or remapped) of an IRTE

[Feng Wu]

This patch adds a new field in struct irq_2_iommu, which can
capture whether the entry is in posted mode or remapped mode.

Signed-off-by: Feng Wu <feng...@intel.com>
Suggested-by: Thomas Gleixner <t...@linutronix.de>
---
 drivers/iommu/intel_irq_remapping.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/intel_irq_remapping.c 
b/drivers/iommu/intel_irq_remapping.c
index 1955b09..70a1b79 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -18,6 +18,11 @@
 
 #include "irq_remapping.h"
 
+enum irq_mode {
+       IRQ_REMAPPING,
+       IRQ_POSTING,
+};
+
 struct ioapic_scope {
        struct intel_iommu *iommu;
        unsigned int id;
@@ -37,6 +42,7 @@ struct irq_2_iommu {
        u16 irte_index;
        u16 sub_handle;
        u8  irte_mask;
+       enum irq_mode mode;
 };
 
 struct intel_ir_data {
@@ -105,6 +111,7 @@ static int alloc_irte(struct intel_iommu *iommu, int irq,
                irq_iommu->irte_index =  index;
                irq_iommu->sub_handle = 0;
                irq_iommu->irte_mask = mask;
+               irq_iommu->mode = IRQ_REMAPPING;
        }
        raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
 
@@ -145,6 +152,8 @@ static int modify_irte(struct irq_2_iommu *irq_iommu,
        __iommu_flush_cache(iommu, irte, sizeof(*irte));
 
        rc = qi_flush_iec(iommu, index, 0);
+
+       irq_iommu->mode = irte->pst ? IRQ_POSTING : IRQ_REMAPPING;
        raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
 
        return rc;
-- 
2.1.0

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