linux-kernel - [PATCH 01/27] x86/irq: Add data structure to keep AMD specific irq remapping information

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Date:	Wed, 11 Jul 2012 15:38:46 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	<iommu@...ts.linux-foundation.org>
CC:	<linux-kernel@...r.kernel.org>,
	Joerg Roedel <joerg.roedel@....com>, <x86@...nel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: [PATCH 01/27] x86/irq: Add data structure to keep AMD specific irq remapping information

Add a data structure to store information the IOMMU driver
can use to get from a 'struct irq_cfg' to the remapping
entry.

Cc: x86@...nel.org
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/include/asm/hw_irq.h       |   14 +++++++++++++-
 arch/x86/kernel/apic/io_apic.c      |    2 +-
 drivers/iommu/intel_irq_remapping.c |    2 +-
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index eb92a6e..b6171e6 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -101,6 +101,7 @@ static inline void set_io_apic_irq_attr(struct io_apic_irq_attr *irq_attr,
 	irq_attr->polarity	= polarity;
 }
 
+/* Intel specific interrupt remapping information */
 struct irq_2_iommu {
 	struct intel_iommu *iommu;
 	u16 irte_index;
@@ -108,6 +109,17 @@ struct irq_2_iommu {
 	u8  irte_mask;
 };
 
+/* AMD specific interrupt remapping information */
+struct irq_2_irte {
+	u16 devid; /* Device ID for IRTE table */
+	u16 index; /* Index into IRTE table*/
+};
+
+union irq_remap_info {
+	struct irq_2_iommu irq_2_iommu;
+	struct irq_2_irte  irq_2_irte;
+};
+
 /*
  * This is performance-critical, we want to do it O(1)
  *
@@ -120,7 +132,7 @@ struct irq_cfg {
 	u8			vector;
 	u8			move_in_progress : 1;
 #ifdef CONFIG_IRQ_REMAP
-	struct irq_2_iommu	irq_2_iommu;
+	union irq_remap_info    irq_remap_info;
 #endif
 };
 
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 5f0ff59..08f666c 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -72,7 +72,7 @@
 static void irq_remap_modify_chip_defaults(struct irq_chip *chip);
 static inline bool irq_remapped(struct irq_cfg *cfg)
 {
-	return cfg->irq_2_iommu.iommu != NULL;
+	return cfg->irq_remap_info.irq_2_iommu.iommu != NULL;
 }
 #else
 static inline bool irq_remapped(struct irq_cfg *cfg)
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 6d34706..e4e4334 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -43,7 +43,7 @@ static DEFINE_RAW_SPINLOCK(irq_2_ir_lock);
 static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
 {
 	struct irq_cfg *cfg = irq_get_chip_data(irq);
-	return cfg ? &cfg->irq_2_iommu : NULL;
+	return cfg ? &cfg->irq_remap_info.irq_2_iommu : NULL;
 }
 
 int get_irte(int irq, struct irte *entry)
-- 
1.7.9.5


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