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authorWei Yang <richard.weiyang@gmail.com>2016-05-21 02:41:51 +0000
committerJoerg Roedel <jroedel@suse.de>2016-06-15 13:36:58 +0200
commit86f004c77c5aba6761d2f6b308a79b1913bea50a (patch)
tree4991edcd0101abf3f75141cc41703638fd4d12b2 /drivers/iommu/intel-iommu.c
parent5edb56491d4812c42175980759da53388e5d86f5 (diff)
iommu/vt-d: Reduce extra first level entry in iommu->domains
In commit <8bf478163e69> ("iommu/vt-d: Split up iommu->domains array"), it it splits iommu->domains in two levels. Each first level contains 256 entries of second level. In case of the ndomains is exact a multiple of 256, it would have one more extra first level entry for current implementation. This patch refines this calculation to reduce the extra first level entry. Signed-off-by: Wei Yang <richard.weiyang@gmail.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/intel-iommu.c')
-rw-r--r--drivers/iommu/intel-iommu.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index a644d0cec2d8..748e5e4b3144 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1672,7 +1672,7 @@ static int iommu_init_domains(struct intel_iommu *iommu)
return -ENOMEM;
}
- size = ((ndomains >> 8) + 1) * sizeof(struct dmar_domain **);
+ size = (ALIGN(ndomains, 256) >> 8) * sizeof(struct dmar_domain **);
iommu->domains = kzalloc(size, GFP_KERNEL);
if (iommu->domains) {
@@ -1737,7 +1737,7 @@ static void disable_dmar_iommu(struct intel_iommu *iommu)
static void free_dmar_iommu(struct intel_iommu *iommu)
{
if ((iommu->domains) && (iommu->domain_ids)) {
- int elems = (cap_ndoms(iommu->cap) >> 8) + 1;
+ int elems = ALIGN(cap_ndoms(iommu->cap), 256) >> 8;
int i;
for (i = 0; i < elems; i++)