linux-kernel - [tip:x86/apic] iommu, x86: Save the mode (posted or remapped) of an IRTE

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Date:	Fri, 12 Jun 2015 02:49:47 -0700
From:	tip-bot for Feng Wu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	joro@...tes.org, feng.wu@...el.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...nel.org
Subject: [tip:x86/apic] iommu, x86: Save the mode (posted or remapped)
  of an IRTE

Commit-ID:  2705a3d2a690c3dd9f58c7d788bc0f432acdeceb
Gitweb:     http://git.kernel.org/tip/2705a3d2a690c3dd9f58c7d788bc0f432acdeceb
Author:     Feng Wu <feng.wu@...el.com>
AuthorDate: Tue, 9 Jun 2015 13:20:32 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
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@...utronix.de>
Signed-off-by: Feng Wu <feng.wu@...el.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Joerg Roedel <joro@...tes.org>
Cc: jiang.liu@...ux.intel.com
Cc: iommu@...ts.linux-foundation.org
Cc: dwmw2@...radead.org
Link: http://lkml.kernel.org/r/1433827237-3382-6-git-send-email-feng.wu@intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 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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