pci_alloc_p2pmem
p2pr->p2pmem = pci_alloc_p2pmem(hdev->pdev, p2pr->size);
nvmeq->sq_cmds = pci_alloc_p2pmem(pdev, SQ_SIZE(nvmeq));
addr = pci_alloc_p2pmem(pdev, length);
EXPORT_SYMBOL_GPL(pci_alloc_p2pmem);
void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size);