[Intel-gfx] [PATCH v2 2/4] iommu/vt-d: Disable superpage for Broxton igfx

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Broxton has known issues with VT-d superpage. Namely frame buffer
compression (FBC) can't be safely used when superpage is enabled.
Currently we're disabling FBC entirely when VT-d is active, but
I think just disabling superpage would be better since FBC can
save some power.

TODO: would be nice to use the macros from include/drm/i915_pciids.h,
      but can't do that with DECLARE_PCI_FIXUP_HEADER()

Cc: David Woodhouse <dwmw2 at infradead.org>
Cc: Lu Baolu <baolu.lu at linux.intel.com>
Cc: iommu at lists.linux-foundation.org
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/iommu/intel/iommu.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 08ba412053e3..ef717908647d 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -5681,6 +5681,13 @@ static void quirk_skip_igfx_superpage(struct pci_dev *dev)
 	iommu_skip_igfx_superpage = 1;
 }
 
+/* Broxton igfx has issues with superpage */
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0A84, quirk_skip_igfx_superpage);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x1A84, quirk_skip_igfx_superpage);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x1A85, quirk_skip_igfx_superpage);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x5A84, quirk_skip_igfx_superpage);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x5A85, quirk_skip_igfx_superpage);
+
 /* Geminilake igfx appears to have issues with superpage */
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x3184, quirk_skip_igfx_superpage);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x3185, quirk_skip_igfx_superpage);
-- 
2.31.1