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x86: mmconf enable mcfg early 

Patch
	"x86: validate against ACPI motherboard resources"

changed the mmconf init sequence, and init MMCONF late in acpi_init.

here change it back to old sequence:

 1. check hostbridge in early
 2. check MCFG with e820 in early
 3. if all fail, will check MCFg with acpi _CRS in acpi_init

So we can make MCONF working again when acpi=off is set if hostbridge
support that.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg KH <greg@kroah.com>
Cc: Greg KH <greg@kroah.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Yinghai Lu 2008-02-15 01:30:14 -08:00 committed by Ingo Molnar
parent 0b64ad7123
commit 05c58b8ac7
1 changed files with 56 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

93
arch/x86/pci/mmconfig-shared.c
View File

@ -241,7 +241,7 @@ static int __init is_acpi_reserved(unsigned long start, unsigned long end)
return mcfg_res.flags;
}
static void __init pci_mmcfg_reject_broken(void)
static void __init pci_mmcfg_reject_broken(int type, int early)
{
typeof(pci_mmcfg_config[0]) *cfg;
int i;
@ -266,34 +266,43 @@ static void __init pci_mmcfg_reject_broken(void)
}
for (i = 0; i < pci_mmcfg_config_num; i++) {
int valid = 0;
u32 size = (cfg->end_bus_number + 1) << 20;
cfg = &pci_mmcfg_config[i];
printk(KERN_NOTICE "PCI: MCFG configuration %d: base %lu "
printk(KERN_NOTICE "PCI: MCFG configuration %d: base %lx "
"segment %hu buses %u - %u\n",
i, (unsigned long)cfg->address, cfg->pci_segment,
(unsigned int)cfg->start_bus_number,
(unsigned int)cfg->end_bus_number);
if (is_acpi_reserved(cfg->address, cfg->address + size - 1)) {
if (!early &&
is_acpi_reserved(cfg->address, cfg->address + size - 1)) {
printk(KERN_NOTICE "PCI: MCFG area at %Lx reserved "
"in ACPI motherboard resources\n",
cfg->address);
} else {
valid = 1;
}
if (valid)
continue;
if (!early)
printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %Lx is not"
" reserved in ACPI motherboard resources\n",
cfg->address);
/* Don't try to do this check unless configuration
type 1 is available. */
if ((pci_probe & PCI_PROBE_CONF1) &&
e820_all_mapped(cfg->address,
if (type == 1 && e820_all_mapped(cfg->address,
cfg->address + size - 1,
E820_RESERVED))
E820_RESERVED)) {
printk(KERN_NOTICE
"PCI: MCFG area at %Lx reserved in "
"E820\n",
"PCI: MCFG area at %Lx reserved in E820\n",
cfg->address);
else
goto reject;
valid = 1;
}
if (!valid)
goto reject;
}
return;
@ -306,46 +315,31 @@ reject:
pci_mmcfg_config_num = 0;
}
void __init pci_mmcfg_early_init(int type)
static int __initdata known_bridge;
void __init __pci_mmcfg_init(int type, int early)
{
if ((pci_probe & PCI_PROBE_MMCONF) == 0)
return;
/* If type 1 access is available, no need to enable MMCONFIG yet, we can
defer until later when the ACPI interpreter is available to better
validate things. */
if (type == 1)
return;
acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
if ((pci_mmcfg_config_num == 0) ||
(pci_mmcfg_config == NULL) ||
(pci_mmcfg_config[0].address == 0))
return;
if (pci_mmcfg_arch_init())
pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
}
void __init pci_mmcfg_late_init(void)
{
int known_bridge = 0;
/* MMCONFIG disabled */
if ((pci_probe & PCI_PROBE_MMCONF) == 0)
return;
/* MMCONFIG already enabled */
if (!(pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF))
if (!early && !(pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF))
return;
if ((pci_probe & PCI_PROBE_CONF1) && pci_mmcfg_check_hostbridge())
known_bridge = 1;
else
acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
/* for late to exit */
if (known_bridge)
return;
pci_mmcfg_reject_broken();
if (early && type == 1) {
if (pci_mmcfg_check_hostbridge())
known_bridge = 1;
}
if (!known_bridge) {
acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
pci_mmcfg_reject_broken(type, early);
}
if ((pci_mmcfg_config_num == 0) ||
(pci_mmcfg_config == NULL) ||
@ -365,6 +359,21 @@ void __init pci_mmcfg_late_init(void)
}
}
void __init pci_mmcfg_early_init(int type)
{
__pci_mmcfg_init(type, 1);
}
void __init pci_mmcfg_late_init(void)
{
int type = 0;
if (pci_probe & PCI_PROBE_CONF1)
type = 1;
__pci_mmcfg_init(type, 0);
}
static int __init pci_mmcfg_late_insert_resources(void)
{
/*