On Sun, 29 Dec 2024 23:51:40 +0800
Tomita Moeko <tomitamoeko@xxxxxxxxx> wrote:
> igd device can either expose as a VGA controller or display controller
> depending on whether it is configured as the primary display device in
> BIOS. In both cases, the OpRegion may be present. Also checks if the
> device is at bdf 00:02.0 to avoid setting up igd-specific regions on
> Intel discrete GPUs.
>
> Signed-off-by: Tomita Moeko <tomitamoeko@xxxxxxxxx>
> ---
> drivers/vfio/pci/vfio_pci.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index e727941f589d..051ef4ad3f43 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -111,9 +111,11 @@ static int vfio_pci_open_device(struct vfio_device *core_vdev)
> if (ret)
> return ret;
>
> - if (vfio_pci_is_vga(pdev) &&
> + if (IS_ENABLED(CONFIG_VFIO_PCI_IGD) &&
> pdev->vendor == PCI_VENDOR_ID_INTEL &&
> - IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
> + ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA ||
The above is vfio_pci_is_vga(pdev), maybe below should have a similar
helper.
> + (pdev->class >> 8) == PCI_CLASS_DISPLAY_OTHER) &&
> + pdev == pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(2, 0))) {
This increments the reference count on the device:
* Given a PCI domain, bus, and slot/function number, the desired PCI
* device is located in the list of PCI devices. If the device is
* found, its reference count is increased and this function returns a
* pointer to its data structure. The caller must decrement the
* reference count by calling pci_dev_put().
> ret = vfio_pci_igd_init(vdev);
> if (ret && ret != -ENODEV) {
> pci_warn(pdev, "Failed to setup Intel IGD regions\n");
