> + select DMA_CMA
Thіs needs to be
select DMA_CMA if HAVE_DMA_CONTIGUOUS
> +#include <linux/dma-contiguous.h>
> + /* Allocate from CMA */
> + // request_pages = (request_size >> PAGE_SHIFT) + 1;
> + request_pages = (round_up(request_size, PAGE_SIZE) >> PAGE_SHIFT);
> + page = dma_alloc_from_contiguous(NULL, request_pages, 0, false);
dma_alloc_from_contiguous is an internal helper, you must use it
through dma_alloc_coherent and pass a struct device to that function.
> + if (!gen2vm) {
> + pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
> + PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
> + if (!pdev) {
> + pr_err("Unable to find PCI Hyper-V video\n");
> + return -ENODEV;
> + }
> + }
Please actually implement a pci_driver instead of hacks like this.
> + par->need_docopy = false;
> + goto getmem1;
> + } else {
No need for an else after a goto.
