forked from Minki/linux
0637a70a5d
Some buggy systems can machine check when config space accesses happen for some non existent devices. i386/x86-64 do some early device scans that might trigger this. Allow pci=noearly to disable this. Also when type 1 is disabling also don't do any early accesses which are always type1. This moves the pci= configuration parsing to be a early parameter. I don't think this can break anything because it only changes a single global that is only used by PCI. Cc: gregkh@suse.de Cc: Trammell Hudson <hudson@osresearch.net> Signed-off-by: Andi Kleen <ak@suse.de>
123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
/* Various workarounds for chipset bugs.
|
|
This code runs very early and can't use the regular PCI subsystem
|
|
The entries are keyed to PCI bridges which usually identify chipsets
|
|
uniquely.
|
|
This is only for whole classes of chipsets with specific problems which
|
|
need early invasive action (e.g. before the timers are initialized).
|
|
Most PCI device specific workarounds can be done later and should be
|
|
in standard PCI quirks
|
|
Mainboard specific bugs should be handled by DMI entries.
|
|
CPU specific bugs in setup.c */
|
|
|
|
#include <linux/pci.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/pci_ids.h>
|
|
#include <asm/pci-direct.h>
|
|
#include <asm/proto.h>
|
|
#include <asm/dma.h>
|
|
|
|
static void via_bugs(void)
|
|
{
|
|
#ifdef CONFIG_IOMMU
|
|
if ((end_pfn > MAX_DMA32_PFN || force_iommu) &&
|
|
!iommu_aperture_allowed) {
|
|
printk(KERN_INFO
|
|
"Looks like a VIA chipset. Disabling IOMMU. Override with iommu=allowed\n");
|
|
iommu_aperture_disabled = 1;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
|
|
static int nvidia_hpet_detected __initdata;
|
|
|
|
static int __init nvidia_hpet_check(unsigned long phys, unsigned long size)
|
|
{
|
|
nvidia_hpet_detected = 1;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static void nvidia_bugs(void)
|
|
{
|
|
#ifdef CONFIG_ACPI
|
|
/*
|
|
* All timer overrides on Nvidia are
|
|
* wrong unless HPET is enabled.
|
|
*/
|
|
nvidia_hpet_detected = 0;
|
|
acpi_table_parse(ACPI_HPET, nvidia_hpet_check);
|
|
if (nvidia_hpet_detected == 0) {
|
|
acpi_skip_timer_override = 1;
|
|
printk(KERN_INFO "Nvidia board "
|
|
"detected. Ignoring ACPI "
|
|
"timer override.\n");
|
|
}
|
|
#endif
|
|
/* RED-PEN skip them on mptables too? */
|
|
|
|
}
|
|
|
|
static void ati_bugs(void)
|
|
{
|
|
#if 1 /* for testing */
|
|
printk("ATI board detected\n");
|
|
#endif
|
|
/* No bugs right now */
|
|
}
|
|
|
|
struct chipset {
|
|
u16 vendor;
|
|
void (*f)(void);
|
|
};
|
|
|
|
static struct chipset early_qrk[] = {
|
|
{ PCI_VENDOR_ID_NVIDIA, nvidia_bugs },
|
|
{ PCI_VENDOR_ID_VIA, via_bugs },
|
|
{ PCI_VENDOR_ID_ATI, ati_bugs },
|
|
{}
|
|
};
|
|
|
|
void __init early_quirks(void)
|
|
{
|
|
int num, slot, func;
|
|
|
|
if (!early_pci_allowed())
|
|
return;
|
|
|
|
/* Poor man's PCI discovery */
|
|
for (num = 0; num < 32; num++) {
|
|
for (slot = 0; slot < 32; slot++) {
|
|
for (func = 0; func < 8; func++) {
|
|
u32 class;
|
|
u32 vendor;
|
|
u8 type;
|
|
int i;
|
|
class = read_pci_config(num,slot,func,
|
|
PCI_CLASS_REVISION);
|
|
if (class == 0xffffffff)
|
|
break;
|
|
|
|
if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
|
|
continue;
|
|
|
|
vendor = read_pci_config(num, slot, func,
|
|
PCI_VENDOR_ID);
|
|
vendor &= 0xffff;
|
|
|
|
for (i = 0; early_qrk[i].f; i++)
|
|
if (early_qrk[i].vendor == vendor) {
|
|
early_qrk[i].f();
|
|
return;
|
|
}
|
|
|
|
type = read_pci_config_byte(num, slot, func,
|
|
PCI_HEADER_TYPE);
|
|
if (!(type & 0x80))
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|