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

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Message-ID: <20120712154031.GA4213@amd.com>
Date:	Thu, 12 Jul 2012 17:40:31 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>, Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH 01/27] x86/irq: Add data structure to keep AMD specific
 irq remapping information

On Wed, Jul 11, 2012 at 02:42:03PM -0700, Yinghai Lu wrote:
> >  #ifdef CONFIG_IRQ_REMAP
> > -       struct irq_2_iommu      irq_2_iommu;
> > +       union irq_remap_info    irq_remap_info;
> 
> how about
> +union {
> +       struct irq_2_iommu irq_2_iommu;
> +       struct irq_2_irte  irq_2_irte;
> +};
> 
> instead?

Yes, that is better. I updated the patch (and 4-5 more patches in the
series to adapt them to this data structure change). I will update the
branch on my tree today and push the version with this change included.
Here is the new patch:

>From a0fd5f10f015629592adc28cb9b79d61d0ba1bfb Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joerg.roedel@....com>
Date: Tue, 19 Jun 2012 16:07:45 +0200
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 |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index eb92a6e..fc89a2a 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 +109,12 @@ 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*/
+};
+
 /*
  * This is performance-critical, we want to do it O(1)
  *
@@ -120,7 +127,10 @@ struct irq_cfg {
 	u8			vector;
 	u8			move_in_progress : 1;
 #ifdef CONFIG_IRQ_REMAP
-	struct irq_2_iommu	irq_2_iommu;
+	union {
+		struct irq_2_iommu irq_2_iommu;
+		struct irq_2_irte  irq_2_irte;
+	};
 #endif
 };
 
-- 
1.7.9.5


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