Bypass the IGD initialization for Intel's dgfx devices with own expansion
ROM and the host/LPC bridge config space are no longer accessed.
Cc: Zhenyu Wang <zhen...@linux.intel.com>
Cc: Xiong Zhang <xiong.y.zh...@intel.com>
Cc: Hang Yuan <hang.y...@linux.intel.com>
Cc: Stuart Summers <stuart.summ...@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demar...@intel.com>
Signed-off-by: Fred Gao <fred....@intel.com>
---
drivers/vfio/pci/vfio_pci.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index f634c81998bb..0f4a34849836 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -28,6 +28,8 @@
#include <linux/nospec.h>
#include <linux/sched/mm.h>
+#include <drm/i915_pciids.h>
+
#include "vfio_pci_private.h"
#define DRIVER_VERSION "0.2"
@@ -60,6 +62,12 @@ module_param(enable_sriov, bool, 0644);
MODULE_PARM_DESC(enable_sriov, "Enable support for SR-IOV configuration.
Enabling SR-IOV on a PF typically requires support of the userspace PF driver,
enabling VFs without such support may result in non-functional VFs or PF.");
#endif
+/* Intel's dgfx is not IGD, so don't handle them the same way */
+static const struct pci_device_id intel_dgfx_pciids[] = {
+ INTEL_DG1_IDS(0),
+ { }
+};
+
static inline bool vfio_vga_disabled(void)
{
#ifdef CONFIG_VFIO_PCI_VGA
@@ -339,7 +347,8 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev)
if (vfio_pci_is_vga(pdev) &&
pdev->vendor == PCI_VENDOR_ID_INTEL &&
- IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
+ IS_ENABLED(CONFIG_VFIO_PCI_IGD) &&
+ !pci_match_id(intel_dgfx_pciids, pdev)) {
ret = vfio_pci_igd_init(vdev);
if (ret) {
pci_warn(pdev, "Failed to setup Intel IGD regions\n");
--
2.24.1.1.gb6d4d82bd5
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