pci_kstat_private_t
pci_kstat_private_t *private_data;
kmem_zalloc(sizeof (pci_kstat_private_t), KM_SLEEP);
pci_kstat_private_t *kstat_private;
kmem_free(kstat_private, sizeof (pci_kstat_private_t));
pci_kstat_private_t *private_data =
(pci_kstat_private_t *)ksp->ks_private;