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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>
This commit is contained in:
Wei Yang 2016-05-21 02:41:51 +00:00 committed by Joerg Roedel
parent 5edb56491d
commit 86f004c77c
1 changed files with 2 additions and 2 deletions
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4
drivers/iommu/intel-iommu.c
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@ -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++)