linux-kernel - [Patch v1 13/17] iommu/amd: Check for irq-remap support amd_iommu

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Date:	Wed, 17 Dec 2014 12:35:44 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Joerg Roedel <joro@...tes.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>
Cc:	Joerg Roedel <jroedel@...e.de>, Tony Luck <tony.luck@...el.com>,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org,
	Jiang Liu <jiang.liu@...ux.intel.com>
Subject: [Patch v1 13/17] iommu/amd: Check for irq-remap support amd_iommu_prepare()

From: Joerg Roedel <jroedel@...e.de>

This allows to get rid of the irq_remapping_supported()
function and all its call-backs into the Intel and AMD
IOMMU drivers.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 drivers/iommu/amd_iommu_init.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index b0522f15730f..0039f87f48b8 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2123,6 +2123,9 @@ static int __init iommu_go_to_state(enum iommu_init_state state)
 #ifdef CONFIG_IRQ_REMAP
 int __init amd_iommu_prepare(void)
 {
+	if (!amd_iommu_irq_remap)
+		return -1;
+
 	return iommu_go_to_state(IOMMU_ACPI_FINISHED);
 }
 
-- 
1.7.10.4

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