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authorGary Hade <garyhade@us.ibm.com>2007-10-03 15:56:14 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-12 15:03:18 -0700
commit036fff4cf732c4d69f99a2915924935705744b00 (patch)
tree87f6f02e40e8f5c28e6d629e009e6e64a45eec58 /arch/x86/pci/acpi.c
parent8fa5913d54f3b1e09948e6a0db34da887e05ff1f (diff)
PCI: skip ISA ioresource alignment on some systems
Skip ISA ioresource alignment on some systems To conserve limited PCI i/o resource on some IBM multi-node systems, the BIOS allocates (via _CRS) and expects the kernel to use addresses in ranges currently excluded by pcibios_align_resource() [i386/pci/i386.c]. This change allows the kernel to use the currently excluded address ranges on the IBM x3800, x3850, and x3950. Signed-off-by: Gary Hade <gary.hade@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/x86/pci/acpi.c')
-rw-r--r--arch/x86/pci/acpi.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index bc8a44bddaa..1dd6f3fc077 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -2,15 +2,57 @@
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/irq.h>
+#include <linux/dmi.h>
#include <asm/numa.h>
#include "pci.h"
+static int __devinit can_skip_ioresource_align(struct dmi_system_id *d)
+{
+ pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
+ printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
+ return 0;
+}
+
+static struct dmi_system_id acpi_pciprobe_dmi_table[] = {
+/*
+ * Systems where PCI IO resource ISA alignment can be skipped
+ * when the ISA enable bit in the bridge control is not set
+ */
+ {
+ .callback = can_skip_ioresource_align,
+ .ident = "IBM System x3800",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
+ },
+ },
+ {
+ .callback = can_skip_ioresource_align,
+ .ident = "IBM System x3850",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
+ },
+ },
+ {
+ .callback = can_skip_ioresource_align,
+ .ident = "IBM System x3950",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
+ },
+ },
+ {}
+};
+
struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
{
struct pci_bus *bus;
struct pci_sysdata *sd;
int pxm;
+ dmi_check_system(acpi_pciprobe_dmi_table);
+
/* Allocate per-root-bus (not per bus) arch-specific data.
* TODO: leak; this memory is never freed.
* It's arguable whether it's worth the trouble to care.