linux-kernel - [PATCH v5 6/8] iommu/amd: Do not re-enable dev table entries in kdump

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Date:   Thu, 15 Sep 2016 23:03:24 +0800
From:   Baoquan He <bhe@...hat.com>
To:     joro@...tes.org
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, dyoung@...hat.com, xlpang@...hat.com,
        Vincent.Wan@....com, Baoquan He <bhe@...hat.com>
Subject: [PATCH v5 6/8] iommu/amd: Do not re-enable dev table entries in kdump

This enabling should have been done in normal kernel. It's unnecessary
to enable it again in kdump kernel.

And clean up the function comments of init_device_table_dma.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 drivers/iommu/amd_iommu_init.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 47a8fc9..8d5db2e 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1651,7 +1651,12 @@ static int __init amd_iommu_init_pci(void)
 	 */
 	ret = amd_iommu_init_api();
 
-	init_device_table_dma();
+	for_each_iommu(iommu) {
+		if ( !translation_pre_enabled(iommu) ) {
+			init_device_table_dma();
+			break;
+		}
+	}
 
 	for_each_iommu(iommu)
 		iommu_flush_all_caches(iommu);
@@ -1829,8 +1834,7 @@ static int __init init_memory_definitions(struct acpi_table_header *table)
 }
 
 /*
- * Init the device table to not allow DMA access for devices and
- * suppress all page faults
+ * Init the device table to not allow DMA access for devices.
  */
 static void init_device_table_dma(void)
 {
-- 
2.5.5