Subject: debloat: add kernel config option to disabling common PCI quirks
From: Gabor Juhos <[email-masked]>

Signed-off-by: Gabor Juhos <[email-masked]>
---
 drivers/pci/Kconfig  | 6 ++++++
 drivers/pci/quirks.c | 6 ++++++
 2 files changed, 12 insertions(+)

--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -118,6 +118,13 @@ config XEN_PCIDEV_FRONTEND
 	  The PCI device frontend driver allows the kernel to import arbitrary
 	  PCI devices from a PCI backend to support PCI driver domains.
 
+config PCI_DISABLE_COMMON_QUIRKS
+	bool "PCI disable common quirks"
+	depends on PCI
+	help
+	  If you don't know what to do here, say N.
+
+
 config PCI_ATS
 	bool
 
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -207,6 +207,7 @@ static void quirk_mmio_always_on(struct
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_ANY_ID, PCI_ANY_ID,
 				PCI_CLASS_BRIDGE_HOST, 8, quirk_mmio_always_on);
 
+#ifndef CONFIG_PCI_DISABLE_COMMON_QUIRKS
 /*
  * The Mellanox Tavor device gives false positive parity errors.  Mark this
  * device with a broken_parity_status to allow PCI scanning code to "skip"
@@ -3341,6 +3342,8 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_I
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x65f9, quirk_intel_mc_errata);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x65fa, quirk_intel_mc_errata);
 
+#endif /* !CONFIG_PCI_DISABLE_COMMON_QUIRKS */
+
 /*
  * Ivytown NTB BAR sizes are misreported by the hardware due to an erratum.
  * To work around this, query the size it should be configured to by the
@@ -3366,6 +3369,8 @@ static void quirk_intel_ntb(struct pci_d
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e08, quirk_intel_ntb);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e0d, quirk_intel_ntb);
 
+#ifndef CONFIG_PCI_DISABLE_COMMON_QUIRKS
+
 /*
  * Some BIOS implementations leave the Intel GPU interrupts enabled, even
  * though no one is handling them (e.g., if the i915 driver is never
@@ -3404,6 +3409,8 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_IN
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x010a, disable_igfx_irq);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0152, disable_igfx_irq);
 
+#endif /* !CONFIG_PCI_DISABLE_COMMON_QUIRKS */
+
 /*
  * PCI devices which are on Intel chips can skip the 10ms delay
  * before entering D3 mode.