vm_page_t
shmem_read_mapping_page(vm_object_t object, vm_pindex_t pindex)
{
vm_page_t m;
int rv;
VM_OBJECT_LOCK_ASSERT_OWNED(object);
m = vm_page_grab(object, pindex, VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
if (m->valid != VM_PAGE_BITS_ALL) {
if (vm_pager_has_page(object, pindex)) {
rv = vm_pager_get_page(object, &m, 1);
m = vm_page_lookup(object, pindex);
if (m == NULL)
return ERR_PTR(-ENOMEM);
if (rv != VM_PAGER_OK) {
vm_page_free(m);
return ERR_PTR(-ENOMEM);
}
} else {
pmap_zero_page(VM_PAGE_TO_PHYS(m));
m->valid = VM_PAGE_BITS_ALL;
m->dirty = 0;
}
}
vm_page_wire(m);
vm_page_wakeup(m);
return (m);
}
int ttm_tt_swapin(struct ttm_tt *ttm)
{
vm_object_t obj;
vm_page_t from_page, to_page;
int i, ret, rv;
obj = ttm->swap_storage;
VM_OBJECT_LOCK(obj);
vm_object_pip_add(obj, 1);
for (i = 0; i < ttm->num_pages; ++i) {
from_page = vm_page_grab(obj, i, VM_ALLOC_NORMAL |
VM_ALLOC_RETRY);
if (from_page->valid != VM_PAGE_BITS_ALL) {
if (vm_pager_has_page(obj, i)) {
rv = vm_pager_get_page(obj, &from_page, 1);
if (rv != VM_PAGER_OK) {
vm_page_free(from_page);
ret = -EIO;
goto err_ret;
}
} else {
vm_page_zero_invalid(from_page, TRUE);
}
}
to_page = ttm->pages[i];
if (unlikely(to_page == NULL)) {
ret = -ENOMEM;
vm_page_wakeup(from_page);
goto err_ret;
}
pmap_copy_page(VM_PAGE_TO_PHYS(from_page),
VM_PAGE_TO_PHYS(to_page));
vm_page_wakeup(from_page);
}
vm_object_pip_wakeup(obj);
VM_OBJECT_UNLOCK(obj);
if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
vm_object_deallocate(obj);
ttm->swap_storage = NULL;
ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
return (0);
err_ret:
vm_object_pip_wakeup(obj);
VM_OBJECT_UNLOCK(obj);
return (ret);
}
