target/linux/generic/pending-4.9/810-pci_disable_common_quirks.patch

   1 From: Gabor Juhos <juhosg@openwrt.org>
   2 Subject: debloat: add kernel config option to disabling common PCI quirks
   3
   4 Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
   5 ---
   6  drivers/pci/Kconfig  | 6 ++++++
   7  drivers/pci/quirks.c | 6 ++++++
   8  2 files changed, 12 insertions(+)
   9
  10 diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
  11 index 6555eb78d91c..120fe3921820 100644
  12 --- a/drivers/pci/Kconfig
  13 +++ b/drivers/pci/Kconfig
  14 @@ -71,6 +71,12 @@ config XEN_PCIDEV_FRONTEND
  15            The PCI device frontend driver allows the kernel to import arbitrary
  16            PCI devices from a PCI backend to support PCI driver domains.
  17
  18 +config PCI_DISABLE_COMMON_QUIRKS
  19 +       bool "PCI disable common quirks"
  20 +       depends on PCI
  21 +       help
  22 +         If you don't know what to do here, say N.
  23 +
  24  config HT_IRQ
  25         bool "Interrupts on hypertransport devices"
  26         default y
  27 diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
  28 index 5d8151b43fbb..cb356e78e743 100644
  29 --- a/drivers/pci/quirks.c
  30 +++ b/drivers/pci/quirks.c
  31 @@ -41,6 +41,7 @@ static void quirk_mmio_always_on(struct pci_dev *dev)
  32  DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_ANY_ID, PCI_ANY_ID,
  33                                 PCI_CLASS_BRIDGE_HOST, 8, quirk_mmio_always_on);
  34
  35 +#ifndef CONFIG_PCI_DISABLE_COMMON_QUIRKS
  36  /* The Mellanox Tavor device gives false positive parity errors
  37   * Mark this device with a broken_parity_status, to allow
  38   * PCI scanning code to "skip" this now blacklisted device.
  39 @@ -3038,6 +3039,7 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x65f8, quirk_intel_mc_errata);
  40  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x65f9, quirk_intel_mc_errata);
  41  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x65fa, quirk_intel_mc_errata);
  42
  43 +#endif /* !CONFIG_PCI_DISABLE_COMMON_QUIRKS */
  44
  45  /*
  46   * Ivytown NTB BAR sizes are misreported by the hardware due to an erratum.  To
  47 @@ -3094,6 +3096,8 @@ static void fixup_debug_report(struct pci_dev *dev, ktime_t calltime,
  48         }
  49  }
  50
  51 +#ifndef CONFIG_PCI_DISABLE_COMMON_QUIRKS
  52 +
  53  /*
  54   * Some BIOS implementations leave the Intel GPU interrupts enabled,
  55   * even though no one is handling them (f.e. i915 driver is never loaded).
  56 @@ -3128,6 +3132,8 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0102, disable_igfx_irq);
  57  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x010a, disable_igfx_irq);
  58  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0152, disable_igfx_irq);
  59
  60 +#endif /* !CONFIG_PCI_DISABLE_COMMON_QUIRKS */
  61 +
  62  /*
  63   * PCI devices which are on Intel chips can skip the 10ms delay
  64   * before entering D3 mode.
  65 --
  66 2.11.0
  67