This is a note to let you know that I've just added the patch titled
iommu/amd: Initialize device table after dma_ops
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-amd-initialize-device-table-after-dma_ops.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f528d980c17b8714aedc918ba86e058af914d66b Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joro@xxxxxxxxxx>
Date: Wed, 6 Feb 2013 12:55:23 +0100
Subject: iommu/amd: Initialize device table after dma_ops
From: Joerg Roedel <joro@xxxxxxxxxx>
commit f528d980c17b8714aedc918ba86e058af914d66b upstream.
When dma_ops are initialized the unity mappings are
created. The init_device_table_dma() function makes sure DMA
from all devices is blocked by default. This opens a short
window in time where DMA to unity mapped regions is blocked
by the IOMMU. Make sure this does not happen by initializing
the device table after dma_ops.
Signed-off-by: Joerg Roedel <joro@xxxxxxxxxx>
Signed-off-by: Shuah Khan <shuah.khan@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iommu/amd_iommu_init.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1572,8 +1572,6 @@ int __init amd_iommu_init_hardware(void)
if (amd_iommu_pd_alloc_bitmap == NULL)
goto free;
- /* init the device table */
- init_device_table();
/*
* let all alias entries point to itself
@@ -1655,6 +1653,7 @@ out:
*/
static int __init amd_iommu_init(void)
{
+ struct amd_iommu *iommu;
int ret = 0;
ret = amd_iommu_init_hardware();
@@ -1673,6 +1672,12 @@ static int __init amd_iommu_init(void)
if (ret)
goto free;
+ /* init the device table */
+ init_device_table();
+
+ for_each_iommu(iommu)
+ iommu_flush_all_caches(iommu);
+
amd_iommu_init_api();
x86_platform.iommu_shutdown = disable_iommus;
Patches currently in stable-queue which might be from joro@xxxxxxxxxx are
queue-3.4/iommu-amd-initialize-device-table-after-dma_ops.patch
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