forked from Minki/linux
036fff4cf7
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>
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
#include <linux/pci.h>
|
|
#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.
|
|
*/
|
|
sd = kzalloc(sizeof(*sd), GFP_KERNEL);
|
|
if (!sd) {
|
|
printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
|
|
return NULL;
|
|
}
|
|
|
|
if (domain != 0) {
|
|
printk(KERN_WARNING "PCI: Multiple domains not supported\n");
|
|
kfree(sd);
|
|
return NULL;
|
|
}
|
|
|
|
sd->node = -1;
|
|
|
|
pxm = acpi_get_pxm(device->handle);
|
|
#ifdef CONFIG_ACPI_NUMA
|
|
if (pxm >= 0)
|
|
sd->node = pxm_to_node(pxm);
|
|
#endif
|
|
|
|
bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
|
|
if (!bus)
|
|
kfree(sd);
|
|
|
|
#ifdef CONFIG_ACPI_NUMA
|
|
if (bus != NULL) {
|
|
if (pxm >= 0) {
|
|
printk("bus %d -> pxm %d -> node %d\n",
|
|
busnum, pxm, sd->node);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return bus;
|
|
}
|
|
|
|
extern int pci_routeirq;
|
|
static int __init pci_acpi_init(void)
|
|
{
|
|
struct pci_dev *dev = NULL;
|
|
|
|
if (pcibios_scanned)
|
|
return 0;
|
|
|
|
if (acpi_noirq)
|
|
return 0;
|
|
|
|
printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
|
|
acpi_irq_penalty_init();
|
|
pcibios_scanned++;
|
|
pcibios_enable_irq = acpi_pci_irq_enable;
|
|
pcibios_disable_irq = acpi_pci_irq_disable;
|
|
|
|
if (pci_routeirq) {
|
|
/*
|
|
* PCI IRQ routing is set up by pci_enable_device(), but we
|
|
* also do it here in case there are still broken drivers that
|
|
* don't use pci_enable_device().
|
|
*/
|
|
printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
|
|
for_each_pci_dev(dev)
|
|
acpi_pci_irq_enable(dev);
|
|
} else
|
|
printk(KERN_INFO "PCI: If a device doesn't work, try \"pci=routeirq\". If it helps, post a report\n");
|
|
|
|
#ifdef CONFIG_X86_IO_APIC
|
|
if (acpi_ioapic)
|
|
print_IO_APIC();
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(pci_acpi_init);
|