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-rw-r--r--Documentation/kernel-parameters.txt6
-rw-r--r--arch/i386/kernel/acpi/earlyquirk.c6
-rw-r--r--arch/i386/pci/common.c4
-rw-r--r--arch/i386/pci/early.c8
-rw-r--r--arch/i386/pci/pci.h1
-rw-r--r--arch/x86_64/kernel/aperture.c2
-rw-r--r--arch/x86_64/kernel/early-quirks.c4
-rw-r--r--arch/x86_64/kernel/pci-calgary.c3
-rw-r--r--arch/x86_64/kernel/vsmp.c3
-rw-r--r--arch/x86_64/mm/k8topology.c3
-rw-r--r--drivers/pci/pci.c5
-rw-r--r--include/asm-x86_64/pci-direct.h2
12 files changed, 41 insertions, 6 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 71d05f48172..4ae99f6e993 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1240,7 +1240,11 @@ running once the system is up.
bootloader. This is currently used on
IXP2000 systems where the bus has to be
configured a certain way for adjunct CPUs.
-
+ noearly [X86] Don't do any early type 1 scanning.
+ This might help on some broken boards which
+ machine check when some devices' config space
+ is read. But various workarounds are disabled
+ and some IOMMU drivers will not work.
pcmv= [HW,PCMCIA] BadgePAD 4
pd. [PARIDE]
diff --git a/arch/i386/kernel/acpi/earlyquirk.c b/arch/i386/kernel/acpi/earlyquirk.c
index 1649a175a20..fe799b11ac0 100644
--- a/arch/i386/kernel/acpi/earlyquirk.c
+++ b/arch/i386/kernel/acpi/earlyquirk.c
@@ -48,7 +48,11 @@ void __init check_acpi_pci(void)
int num, slot, func;
/* Assume the machine supports type 1. If not it will
- always read ffffffff and should not have any side effect. */
+ always read ffffffff and should not have any side effect.
+ Actually a few buggy systems can machine check. Allow the user
+ to disable it by command line option at least -AK */
+ if (!early_pci_allowed())
+ return;
/* Poor man's PCI discovery */
for (num = 0; num < 32; num++) {
diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c
index 0a362e3aeac..68bce194e68 100644
--- a/arch/i386/pci/common.c
+++ b/arch/i386/pci/common.c
@@ -242,6 +242,10 @@ char * __devinit pcibios_setup(char *str)
acpi_noirq_set();
return NULL;
}
+ else if (!strcmp(str, "noearly")) {
+ pci_probe |= PCI_PROBE_NOEARLY;
+ return NULL;
+ }
#ifndef CONFIG_X86_VISWS
else if (!strcmp(str, "usepirqmask")) {
pci_probe |= PCI_USE_PIRQ_MASK;
diff --git a/arch/i386/pci/early.c b/arch/i386/pci/early.c
index b1f7f40d809..713d6c866ca 100644
--- a/arch/i386/pci/early.c
+++ b/arch/i386/pci/early.c
@@ -1,6 +1,8 @@
#include <linux/kernel.h>
+#include <linux/pci.h>
#include <asm/pci-direct.h>
#include <asm/io.h>
+#include "pci.h"
/* Direct PCI access. This is used for PCI accesses in early boot before
the PCI subsystem works. */
@@ -42,3 +44,9 @@ void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
outl(val, 0xcfc);
}
+
+int early_pci_allowed(void)
+{
+ return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
+ PCI_PROBE_CONF1;
+}
diff --git a/arch/i386/pci/pci.h b/arch/i386/pci/pci.h
index 8a7cf1f2368..1814f74569c 100644
--- a/arch/i386/pci/pci.h
+++ b/arch/i386/pci/pci.h
@@ -17,6 +17,7 @@
#define PCI_PROBE_CONF2 0x0004
#define PCI_PROBE_MMCONF 0x0008
#define PCI_PROBE_MASK 0x000f
+#define PCI_PROBE_NOEARLY 0x0010
#define PCI_NO_SORT 0x0100
#define PCI_BIOS_SORT 0x0200
diff --git a/arch/x86_64/kernel/aperture.c b/arch/x86_64/kernel/aperture.c
index f851e1f9c82..b487396c4c5 100644
--- a/arch/x86_64/kernel/aperture.c
+++ b/arch/x86_64/kernel/aperture.c
@@ -212,7 +212,7 @@ void __init iommu_hole_init(void)
u64 aper_base, last_aper_base = 0;
int valid_agp = 0;
- if (iommu_aperture_disabled || !fix_aperture)
+ if (iommu_aperture_disabled || !fix_aperture || !early_pci_allowed())
return;
printk("Checking aperture...\n");
diff --git a/arch/x86_64/kernel/early-quirks.c b/arch/x86_64/kernel/early-quirks.c
index d637cff1c4b..208e38a372c 100644
--- a/arch/x86_64/kernel/early-quirks.c
+++ b/arch/x86_64/kernel/early-quirks.c
@@ -82,6 +82,10 @@ static struct chipset early_qrk[] = {
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++) {
diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index 466588f9560..cfb09b07ae9 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -924,6 +924,9 @@ void __init detect_calgary(void)
if (swiotlb || no_iommu || iommu_detected)
return;
+ if (!early_pci_allowed())
+ return;
+
specified_table_size = determine_tce_table_size(end_pfn * PAGE_SIZE);
for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
diff --git a/arch/x86_64/kernel/vsmp.c b/arch/x86_64/kernel/vsmp.c
index 92f70c74965..044e852bd25 100644
--- a/arch/x86_64/kernel/vsmp.c
+++ b/arch/x86_64/kernel/vsmp.c
@@ -20,6 +20,9 @@ static int __init vsmp_init(void)
void *address;
unsigned int cap, ctl;
+ if (!early_pci_allowed())
+ return 0;
+
/* Check if we are running on a ScaleMP vSMP box */
if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) != PCI_VENDOR_ID_SCALEMP) ||
(read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) != PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
diff --git a/arch/x86_64/mm/k8topology.c b/arch/x86_64/mm/k8topology.c
index 7c45c2d2b8b..5cf594f9230 100644
--- a/arch/x86_64/mm/k8topology.c
+++ b/arch/x86_64/mm/k8topology.c
@@ -54,6 +54,9 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
nodes_clear(nodes_parsed);
+ if (!early_pci_allowed())
+ return -1;
+
nb = find_northbridge();
if (nb < 0)
return nb;
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 9f79dd6d51a..684deb6b03a 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -953,13 +953,12 @@ static int __devinit pci_setup(char *str)
}
str = k;
}
- return 1;
+ return 0;
}
+early_param("pci", pci_setup);
device_initcall(pci_init);
-__setup("pci=", pci_setup);
-
#if defined(CONFIG_ISA) || defined(CONFIG_EISA)
/* FIXME: Some boxes have multiple ISA bridges! */
struct pci_dev *isa_bridge;
diff --git a/include/asm-x86_64/pci-direct.h b/include/asm-x86_64/pci-direct.h
index 9d916cdaa18..eba9cb471df 100644
--- a/include/asm-x86_64/pci-direct.h
+++ b/include/asm-x86_64/pci-direct.h
@@ -11,4 +11,6 @@ extern u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset);
extern u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset);
extern void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, u32 val);
+extern int early_pci_allowed(void);
+
#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-06 00:00:33 +0000