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diff --git a/sys/x86/iommu/intel_idpgtbl.c b/sys/x86/iommu/intel_idpgtbl.c
--- a/sys/x86/iommu/intel_idpgtbl.c
+++ b/sys/x86/iommu/intel_idpgtbl.c
@@ -390,7 +390,7 @@
* pte write and clean while the lock is
* dropped.
*/
- m->ref_count++;
+ vm_page_drop(m, -1);
sfp = NULL;
ptep = domain_pgtbl_map_pte(domain, base, lvl - 1,
@@ -398,7 +398,7 @@
if (ptep == NULL) {
KASSERT(m->pindex != 0,
("loosing root page %p", domain));
- m->ref_count--;
+ vm_page_drop(m, 1);
iommu_pgfree(domain->pgtbl_obj, m->pindex,
flags);
return (NULL);
@@ -406,8 +406,8 @@
dmar_pte_store(&ptep->pte, DMAR_PTE_R | DMAR_PTE_W |
VM_PAGE_TO_PHYS(m));
dmar_flush_pte_to_ram(domain->dmar, ptep);
- sf_buf_page(sfp)->ref_count += 1;
- m->ref_count--;
+ vm_page_drop(sf_buf_page(sfp), -1);
+ vm_page_drop(m, 1);
iommu_unmap_pgtbl(sfp);
/* Only executed once. */
goto retry;
@@ -486,7 +486,7 @@
dmar_pte_store(&pte->pte, VM_PAGE_TO_PHYS(ma[pi]) | pflags |
(superpage ? DMAR_PTE_SP : 0));
dmar_flush_pte_to_ram(domain->dmar, pte);
- sf_buf_page(sf)->ref_count += 1;
+ vm_page_drop(sf_buf_page(sf), -1);
}
if (sf != NULL)
iommu_unmap_pgtbl(sf);
@@ -592,8 +592,8 @@
iommu_unmap_pgtbl(*sf);
*sf = NULL;
}
- m->ref_count--;
- if (m->ref_count != 0)
+ vm_page_drop(m, 1);
+ if (VPRC_WIRE_COUNT(m->ref_count) != 0)
return;
KASSERT(lvl != 0,
("lost reference (lvl) on root pg domain %p base %jx lvl %d",
@@ -709,7 +709,7 @@
m = iommu_pgalloc(domain->pgtbl_obj, 0, IOMMU_PGF_WAITOK |
IOMMU_PGF_ZERO | IOMMU_PGF_OBJL);
/* No implicit free of the top level page table page. */
- m->ref_count = 1;
+ vm_page_drop(m, -1);
DMAR_DOMAIN_PGUNLOCK(domain);
DMAR_LOCK(domain->dmar);
domain->iodom.flags |= IOMMU_DOMAIN_PGTBL_INITED;
@@ -722,6 +722,7 @@
{
vm_object_t obj;
vm_page_t m;
+ int r;
obj = domain->pgtbl_obj;
if (obj == NULL) {
@@ -741,8 +742,12 @@
/* Obliterate ref_counts */
VM_OBJECT_ASSERT_WLOCKED(obj);
- for (m = vm_page_lookup(obj, 0); m != NULL; m = vm_page_next(m))
- m->ref_count = 0;
+ for (m = vm_page_lookup(obj, 0); m != NULL; m = vm_page_next(m)) {
+ r = m->ref_count;
+ while (atomic_fcmpset_int(&m->ref_count, &r,
+ r & (VPRC_BLOCKED | VPRC_OBJREF)) == 0)
+ ;
+ }
VM_OBJECT_WUNLOCK(obj);
vm_object_deallocate(obj);
}

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