Patchwork [1/5] iommu: Move initialization earlier

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Submitter Alexey Kardashevskiy
Date May 6, 2013, 7:21 a.m.
Message ID <>
Download mbox | patch
Permalink /patch/241578/
State New
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Alexey Kardashevskiy - May 6, 2013, 7:21 a.m.
From: Alexey Kardashevskiy <>

The iommu_init() call initializes IOMMU internal structures and data
required for the API to function such as iommu_group_alloc().
It is registered as a subsys_initcall.

One of the IOMMU users is a PCI subsystem on POWER which discovers new
IOMMU tables during the PCI scan so the most logical place to call
iommu_group_alloc() is when a new group is just discovered. However
PCI scan is done from subsys_initcall hook as well, which makes
use of the IOMMU API impossible.

This moves IOMMU subsystem initialization one step earlier.

Signed-off-by: Alexey Kardashevskiy <>
Cc: David Gibson <>
Signed-off-by: Paul Mackerras <>
 drivers/iommu/iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 5514dfa..0de83eb 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -890,7 +890,7 @@  static int __init iommu_init(void)
 	return 0;
 int iommu_domain_get_attr(struct iommu_domain *domain,
 			  enum iommu_attr attr, void *data)