linux-kernel - [PATCH 19/19] iommu/vt-d: Don't disable IR when it was previously enabled

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Message-Id: <1434178047-17809-20-git-send-email-joro@8bytes.org>
Date:	Sat, 13 Jun 2015 08:47:27 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	David Woodhouse <dwmw2@...radead.org>, zhen-hual@...com,
	bhe@...hat.com, ddutile@...hat.com, alex.williamson@...hat.com,
	dyoung@...hat.com, linux-kernel@...r.kernel.org,
	jroedel@...tes.org, joro@...tes.org, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 19/19] iommu/vt-d: Don't disable IR when it was previously enabled

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

Keep it enabled in kdump kernel to guarantee interrupt
delivery.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/intel_irq_remapping.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 14e10de..47fcebf 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -742,9 +742,6 @@ static int __init intel_prepare_irq_remapping(void)
 			pr_info("%s does not support EIM\n", iommu->name);
 			eim = 0;
 		}
-
-		/* Disable IRQ remapping if it is already enabled */
-		iommu_disable_irq_remapping(iommu);
 	}
 
 	eim_mode = eim;
@@ -777,7 +774,8 @@ static int __init intel_enable_irq_remapping(void)
 	 * Setup Interrupt-remapping for all the DRHD's now.
 	 */
 	for_each_iommu(iommu, drhd) {
-		iommu_enable_irq_remapping(iommu);
+		if (!ir_pre_enabled(iommu))
+			iommu_enable_irq_remapping(iommu);
 		setup = true;
 	}
 
-- 
1.9.1

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