drm_pci_alloc
dmah = drm_pci_alloc(dev, map->size, map->size);
dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
EXPORT_SYMBOL(drm_pci_alloc);
phys = drm_pci_alloc(obj->base.dev,
struct drm_dma_handle *drm_pci_alloc(struct drm_device *dev, size_t size,
rdev->dummy_page.dmah = drm_pci_alloc(rdev->ddev, PAGE_SIZE, PAGE_SIZE);