linux-kernel - [PATCH 02/19] iommu/vt-d: Init QI before root entry is allocated

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Message-Id: <1434178047-17809-3-git-send-email-joro@8bytes.org>
Date:	Sat, 13 Jun 2015 08:47:10 +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 02/19] iommu/vt-d: Init QI before root entry is allocated

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

QI needs to be available when we write the root entry into
hardware because flushes might be necessary after this.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/intel-iommu.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 14af51d..b380fd1 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2783,6 +2783,8 @@ static int __init init_dmars(void)
 	for_each_active_iommu(iommu, drhd) {
 		g_iommus[iommu->seq_id] = iommu;
 
+		intel_iommu_init_qi(iommu);
+
 		ret = iommu_init_domains(iommu);
 		if (ret)
 			goto free_iommu;
@@ -2799,9 +2801,6 @@ static int __init init_dmars(void)
 			hw_pass_through = 0;
 	}
 
-	for_each_active_iommu(iommu, drhd)
-		intel_iommu_init_qi(iommu);
-
 	if (iommu_pass_through)
 		iommu_identity_mapping |= IDENTMAP_ALL;
 
-- 
1.9.1

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