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vfio/pci: match IGD devices in display controller class

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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. A new helper function
vfio_pci_is_intel_display() is introduced to check if the device might
be an IGD device.

Signed-off-by: Tomita Moeko <tomitamoeko@gmail.com>
Link: https://lore.kernel.org/r/20250123163416.7653-1-tomitamoeko@gmail.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Tomita Moeko 2025-01-24 00:34:15 +08:00 committed by Alex Williamson
parent d082ecbc71
commit 41112160ca
3 changed files with 13 additions and 3 deletions
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4
drivers/vfio/pci/vfio_pci.c
View File

@ -111,9 +111,7 @@ static int vfio_pci_open_device(struct vfio_device *core_vdev)
if (ret)
return ret;
if (vfio_pci_is_vga(pdev) &&
pdev->vendor == PCI_VENDOR_ID_INTEL &&
IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
if (vfio_pci_is_intel_display(pdev)) {
ret = vfio_pci_igd_init(vdev);
if (ret && ret != -ENODEV) {
pci_warn(pdev, "Failed to setup Intel IGD regions\n");

6
drivers/vfio/pci/vfio_pci_igd.c
View File

@ -435,6 +435,12 @@ static int vfio_pci_igd_cfg_init(struct vfio_pci_core_device *vdev)
return 0;
}
bool vfio_pci_is_intel_display(struct pci_dev *pdev)
{
return (pdev->vendor == PCI_VENDOR_ID_INTEL) &&
((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY);
}
int vfio_pci_igd_init(struct vfio_pci_core_device *vdev)
{
int ret;

6
drivers/vfio/pci/vfio_pci_priv.h
View File

@ -67,8 +67,14 @@ void vfio_pci_memory_unlock_and_restore(struct vfio_pci_core_device *vdev,
u16 cmd);
#ifdef CONFIG_VFIO_PCI_IGD
bool vfio_pci_is_intel_display(struct pci_dev *pdev);
int vfio_pci_igd_init(struct vfio_pci_core_device *vdev);
#else
static inline bool vfio_pci_is_intel_display(struct pci_dev *pdev)
{
return false;
}
static inline int vfio_pci_igd_init(struct vfio_pci_core_device *vdev)
{
return -ENODEV;