linux-kernel - [ 36/82] iommu/amd: Initialize device table after dma

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Message-Id: <20130318042147.707124294@decadent.org.uk>
Date:	Mon, 18 Mar 2013 04:22:20 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Shuah Khan <shuah.khan@...com>,
	Joerg Roedel <joro@...tes.org>
Subject: [ 36/82] iommu/amd: Initialize device table after dma_ops

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Shuah Khan <shuah.khan@...com>

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.

Tested on 3.2.38

Signed-off-by: Joerg Roedel <joro@...tes.org>
Signed-off-by: Shuah Khan <shuah.khan@...com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/iommu/amd_iommu_init.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1396,6 +1396,7 @@ static struct syscore_ops amd_iommu_sysc
  */
 static int __init amd_iommu_init(void)
 {
+	struct amd_iommu *iommu;
 	int i, ret = 0;
 
 	/*
@@ -1444,9 +1445,6 @@ static int __init amd_iommu_init(void)
 	if (amd_iommu_pd_alloc_bitmap == NULL)
 		goto free;
 
-	/* init the device table */
-	init_device_table();
-
 	/*
 	 * let all alias entries point to itself
 	 */
@@ -1496,6 +1494,12 @@ static int __init amd_iommu_init(void)
 	if (ret)
 		goto free_disable;
 
+	/* init the device table */
+	init_device_table();
+
+	for_each_iommu(iommu)
+		iommu_flush_all_caches(iommu);
+
 	amd_iommu_init_api();
 
 	amd_iommu_init_notifier();


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