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In dmar_gas_lowermatch, skip searching a subtree if all its addresses are greater than lowaddr.

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In dmar_gas_uppermatch, skip searching a subtree if all its gaps-between-alloctions are too small.

Reviewed by:	kib
Tested by:	pho
Differential Revision:	https://reviews.freebsd.org/D23391
This commit is contained in:
Doug Moore 2020-02-01 21:47:34 +00:00
parent 5cc422a222
commit 5a9447a324
1 changed files with 4 additions and 0 deletions
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4
sys/x86/iommu/intel_gas.c
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@ -370,6 +370,8 @@ dmar_gas_lowermatch(struct dmar_gas_match_args *a, struct dmar_map_entry *entry)
}
if (entry->free_down < a->size + a->offset + DMAR_PAGE_SIZE)
return (ENOMEM);
if (entry->first >= a->common->lowaddr)
return (ENOMEM);
child = RB_LEFT(entry, rb_entry);
if (child != NULL && 0 == dmar_gas_lowermatch(a, child))
return (0);
@ -390,6 +392,8 @@ dmar_gas_uppermatch(struct dmar_gas_match_args *a, struct dmar_map_entry *entry)
{
struct dmar_map_entry *child;
if (entry->free_down < a->size + a->offset + DMAR_PAGE_SIZE)
return (ENOMEM);
if (entry->last < a->common->highaddr)
return (ENOMEM);
child = RB_LEFT(entry, rb_entry);