linux-kernel - [PATCH 3.10 102/268] x86/PCI: Ignore

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Message-Id: <1497897167-14556-103-git-send-email-w@1wt.eu>
Date:   Mon, 19 Jun 2017 20:30:01 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 102/268] x86/PCI: Ignore _CRS on Supermicro X8DTH-i/6/iF/6F

From: Bjorn Helgaas <bhelgaas@...gle.com>

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@...nberg.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 arch/x86/pci/acpi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index a3b0265..63462c8 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -118,6 +118,16 @@ 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 */
 	{
-- 
2.8.0.rc2.1.gbe9624a