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

From: Feng Wu
Date: Wed May 27 2015 - 00:16:36 EST


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.wu@xxxxxxxxx>
Suggested-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
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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