From: Baoquan He <bhe@redhat.com>
To: jroedel@suse.de
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
Baoquan He <bhe@redhat.com>
Subject: [PATCH v9 13/13] iommu/amd: Disable iommu only if amd_iommu=off is specified
Date: Tue, 1 Aug 2017 19:37:29 +0800 [thread overview]
Message-ID: <1501587449-9817-14-git-send-email-bhe@redhat.com> (raw)
In-Reply-To: <1501587449-9817-1-git-send-email-bhe@redhat.com>
It's ok to disable iommu in normal kernel. While there's no need
to disable it in kdump kernel after the on-flight dma issue has
heen fixed.
Signed-off-by: Baoquan He <bhe@redhat.com>
---
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 cada2e302761..5015d61c1dcf 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2502,7 +2502,8 @@ static int __init early_amd_iommu_init(void)
goto out;
/* Disable any previously enabled IOMMUs */
- disable_iommus();
+ if (amd_iommu_disabled)
+ disable_iommus();
if (amd_iommu_irq_remap)
amd_iommu_irq_remap = check_ioapic_information();
--
2.5.5
prev parent reply other threads:[~2017-08-01 11:37 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-01 11:37 [PATCH v9 00/13] Fix the on-flight DMA issue on system with amd iommu Baoquan He
2017-08-01 11:37 ` [PATCH v9 01/13] iommu/amd: Detect pre enabled translation Baoquan He
2017-08-01 11:37 ` [PATCH v9 02/13] iommu/amd: add several helper functions Baoquan He
2017-08-01 11:37 ` [PATCH v9 03/13] Revert "iommu/amd: Suppress IO_PAGE_FAULTs in kdump kernel" Baoquan He
2017-08-01 11:37 ` [PATCH v9 04/13] iommu/amd: Define bit fields for DTE particularly Baoquan He
2017-08-01 11:37 ` [PATCH v9 06/13] iommu/amd: copy old trans table from old kernel Baoquan He
2017-08-04 12:21 ` Joerg Roedel
2017-08-04 13:09 ` Baoquan He
2017-08-01 11:37 ` [PATCH v9 07/13] iommu/amd: Do sanity check for address translation and irq remap of old dev table entry Baoquan He
[not found] ` <1501587449-9817-1-git-send-email-bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-08-01 11:37 ` [PATCH v9 05/13] iommu/amd: Add function copy_dev_tables() Baoquan He
2017-08-04 12:09 ` Joerg Roedel
2017-08-04 12:21 ` Baoquan He
2017-08-04 12:30 ` Baoquan He
2017-08-04 12:51 ` Joerg Roedel
[not found] ` <20170804125159.GY3431-l3A5Bk7waGM@public.gmane.org>
2017-08-04 13:00 ` Baoquan He
2017-08-01 11:37 ` [PATCH v9 08/13] iommu: Add is_attach_deferred call-back to iommu-ops Baoquan He
2017-08-01 11:37 ` [PATCH v9 09/13] iommu/amd: Use is_attach_deferred call-back Baoquan He
2017-08-01 11:37 ` [PATCH v9 10/13] iommu/amd: Allocate memory below 4G for dev table if translation pre-enabled Baoquan He
2017-08-04 12:25 ` Joerg Roedel
[not found] ` <20170804122524.GV3431-l3A5Bk7waGM@public.gmane.org>
2017-08-04 13:01 ` Baoquan He
2017-08-01 11:37 ` [PATCH v9 11/13] iommu/amd: Don't copy GCR3 table root pointer Baoquan He
2017-08-04 12:27 ` Joerg Roedel
2017-08-01 11:37 ` [PATCH v9 12/13] iommu/amd: Clear out the GV flag when handle deferred domain attach Baoquan He
2017-08-04 12:30 ` Joerg Roedel
2017-08-04 13:13 ` Baoquan He
2017-08-04 13:18 ` Joerg Roedel
2017-08-01 11:37 ` Baoquan He [this message]
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