From: Joerg Roedel <joro@8bytes.org>
To: iommu@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org, Joerg Roedel <jroedel@suse.de>
Subject: [PATCH 1/7] iommu/amd: Disable IOMMUs at boot if they are enabled
Date: Fri, 16 Jun 2017 16:09:54 +0200 [thread overview]
Message-ID: <1497622200-18188-2-git-send-email-joro@8bytes.org> (raw)
In-Reply-To: <1497622200-18188-1-git-send-email-joro@8bytes.org>
From: Joerg Roedel <jroedel@suse.de>
When booting, make sure the IOMMUs are disabled. They could
be previously enabled if we boot into a kexec or kdump
kernel. So make sure they are off.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
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 d9f5ddd..fb7035f 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2316,6 +2316,9 @@ static int __init early_amd_iommu_init(void)
if (ret)
goto out;
+ /* Disable any previously enabled IOMMUs */
+ disable_iommus();
+
if (amd_iommu_irq_remap)
amd_iommu_irq_remap = check_ioapic_information();
--
2.7.4
next prev parent reply other threads:[~2017-06-16 14:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-16 14:09 [PATCH 0/7] iommu/amd: Disable previously enabled IOMMUs at boot Joerg Roedel
2017-06-16 14:09 ` Joerg Roedel [this message]
[not found] ` <1497622200-18188-1-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-06-16 14:09 ` [PATCH 2/7] iommu/amd: Rename free_on_init_error() Joerg Roedel
2017-06-16 14:09 ` [PATCH 3/7] iommu/amd: Add new init-state IOMMU_CMDLINE_DISABLED Joerg Roedel
2017-06-16 14:09 ` [PATCH 4/7] iommu/amd: Check for error states first in iommu_go_to_state() Joerg Roedel
2017-06-16 14:09 ` [PATCH 5/7] iommu/amd: Set global pointers to NULL after freeing them Joerg Roedel
2017-06-16 14:09 ` [PATCH 6/7] iommu/amd: Free IOMMU resources when disabled on command line Joerg Roedel
2017-06-16 14:10 ` [PATCH 7/7] iommu/amd: Remove amd_iommu_disabled check from amd_iommu_detect() Joerg Roedel
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