summaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorBjorn Helgaas <bhelgaas@google.com>2015-06-09 17:31:38 -0500
committerJiri Slaby <jslaby@suse.cz>2015-07-30 14:10:45 +0200
commit601291ed9d980a016c4a95cbf2d1ef4bf1aed503 (patch)
tree462aaa6e0a2912686af8a399ab6976530c811591 /arch
parent5029d7e0b1f8fc45efdc6fad2dd688801476b505 (diff)
x86/PCI: Use host bridge _CRS info on systems with >32 bit addressing
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@outlook.com> Reported-and-tested-by: Alan Horsfield <alan@hazelgarth.co.uk> 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@google.com> Signed-off-by: Jiri Slaby <jslaby@suse.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/pci/acpi.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 3a3e99bde773..a24e9c2e95da 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -135,8 +135,10 @@ 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);