This is a note to let you know that I've just added the patch titled
x86/PCI: Use host bridge _CRS info on systems with >32 bit addressing
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-pci-use-host-bridge-_crs-info-on-systems-with-32-bit-addressing.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3d9fecf6bfb8b12bc2f9a4c7109895a2a2bb9436 Mon Sep 17 00:00:00 2001
From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Date: Tue, 9 Jun 2015 17:31:38 -0500
Subject: x86/PCI: Use host bridge _CRS info on systems with >32 bit addressing
From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
commit 3d9fecf6bfb8b12bc2f9a4c7109895a2a2bb9436 upstream.
We enable _CRS on all systems from 2008 and later. On older systems, we
ignore _CRS and assume the whole physical address space (excluding RAM and
other devices) is available for PCI devices, but on systems that support
physical address spaces larger than 4GB, it's doubtful that the area above
4GB is really available for PCI.
After d56dbf5bab8c ("PCI: Allocate 64-bit BARs above 4G when possible"), we
try to use that space above 4GB *first*, so we're more likely to put a
device there.
On Juan's Toshiba Satellite Pro U200, BIOS left the graphics, sound, 1394,
and card reader devices unassigned (but only after Windows had been
booted). Only the sound device had a 64-bit BAR, so it was the only device
placed above 4GB, and hence the only device that didn't work.
Keep _CRS enabled even on pre-2008 systems if they support physical address
space larger than 4GB.
Fixes: d56dbf5bab8c ("PCI: Allocate 64-bit BARs above 4G when possible")
Reported-and-tested-by: Juan Dayer <jdayer@xxxxxxxxxxx>
Reported-and-tested-by: Alan Horsfield <alan@xxxxxxxxxxxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=99221
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=907092
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/pci/acpi.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -124,8 +124,10 @@ void __init pci_acpi_crs_quirks(void)
{
int year;
- if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
- pci_use_crs = false;
+ if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008) {
+ if (iomem_resource.end <= 0xffffffff)
+ pci_use_crs = false;
+ }
dmi_check_system(pci_crs_quirks);
Patches currently in stable-queue which might be from bhelgaas@xxxxxxxxxx are
queue-3.14/x86-pci-use-host-bridge-_crs-info-on-systems-with-32-bit-addressing.patch
queue-3.14/x86-pci-use-host-bridge-_crs-info-on-foxconn-k8m890-8237a.patch
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