linux-kernel - [PATCH v10 12/12] iommu/amd: Disable iommu only if amd

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Message-Id: <1502267624-7066-13-git-send-email-bhe@redhat.com>
Date:   Wed,  9 Aug 2017 16:33:44 +0800
From:   Baoquan He <bhe@...hat.com>
To:     jroedel@...e.de
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH v10 12/12] iommu/amd: Disable iommu only if amd_iommu=off is specified

It's ok to disable iommu early in normal kernel or in kdump kernel when
amd_iommu=off is specified. While we should not disable it in kdump kernel
when on-flight dma is still on-going.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
v9->v10:
  Change to call disable_iommus() in normal kernel and the case that
  amd_iommu=off is set in kdump kernel. Otherwise if in kdump kernel
  but amd_iommu=off is not specified, we can just keep it as it is
  in 1st kernel.

 drivers/iommu/amd_iommu_init.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 88e7a6e950ae..c7d03251c80a 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2499,7 +2499,8 @@ static int __init early_amd_iommu_init(void)
 		goto out;
 
 	/* Disable any previously enabled IOMMUs */
-	disable_iommus();
+	if (!is_kdump_kernel() || amd_iommu_disabled)
+		disable_iommus();
 
 	if (amd_iommu_irq_remap)
 		amd_iommu_irq_remap = check_ioapic_information();
-- 
2.5.5