Commit-ID: 2705a3d2a690c3dd9f58c7d788bc0f432acdeceb
Gitweb: http://git.kernel.org/tip/2705a3d2a690c3dd9f58c7d788bc0f432acdeceb
Author: Feng Wu <feng.wu@xxxxxxxxx>
AuthorDate: Tue, 9 Jun 2015 13:20:32 +0800
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 12 Jun 2015 11:33:52 +0200
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@xxxxxxxxxxxxx>
Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Joerg Roedel <joro@xxxxxxxxxx>
Cc: jiang.liu@xxxxxxxxxxxxxxx
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: dwmw2@xxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1433827237-3382-6-git-send-email-feng.wu@xxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
drivers/iommu/intel_irq_remapping.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index a643eec..68bce0a 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 {
@@ -104,6 +110,7 @@ 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);
@@ -144,6 +151,9 @@ static int modify_irte(struct irq_2_iommu *irq_iommu,
__iommu_flush_cache(iommu, irte, sizeof(*irte));
rc = qi_flush_iec(iommu, index, 0);
+
+ /* Update iommu mode according to the IRTE mode */
+ irq_iommu->mode = irte->pst ? IRQ_POSTING : IRQ_REMAPPING;
raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return rc;
--
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