x86/PCI: Ignore _CRS on Supermicro X8DTH-i/6/iF/6F

commit 89e9f7bcd8744ea25fcf0ac671b8d72c10d7d790 upstream.

Martin reported that the Supermicro X8DTH-i/6/iF/6F advertises incorrect
host bridge windows via _CRS:

  pci_root PNP0A08:00: host bridge window [io  0xf000-0xffff]
  pci_root PNP0A08:01: host bridge window [io  0xf000-0xffff]

Both bridges advertise the 0xf000-0xffff window, which cannot be correct.

Work around this by ignoring _CRS on this system.  The downside is that we
may not assign resources correctly to hot-added PCI devices (if they are
possible on this system).

Link: https://bugzilla.kernel.org/show_bug.cgi?id=42606
Reported-by: Martin Burnicki <martin.burnicki@meinberg.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 3cd6983..3961103 100644 (file)
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -114,6 +114,16 @@ static const struct dmi_system_id pci_crs_quirks[] __initconst = {
                        DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
                },
        },
+       /* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */
+       {
+               .callback = set_nouse_crs,
+               .ident = "Supermicro X8DTH",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "2.0a"),
+               },
+       },
 
        /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
        {