cio_gp_dma_free
void cio_gp_dma_free(struct gen_pool *gp_dma, void *cpu_addr, size_t size);
cio_gp_dma_free(cio_dma_pool, cpu_addr, size);
cio_gp_dma_free(cdev->private->dma_pool, cdev->private->dma_area,
cio_gp_dma_free(cdev->private->dma_pool, cpu_addr, size);