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x86: if acpi=off, force setting the mmconf for fam10h

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some BIOS only let AMD fam 10h handle bus0, and nvidia mcp55/ck804
to handle other buses. at that case MCFG will cover all over them.

but with acpi=off, we can not use MCFG. this patch will double check
the busnbits, and if it is less handling 256 bues, and acpi=off
will forcely reset the mmconf in msr, so we still use mmconf in above case.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-02-25 18:41:35 -08:00 committed by Ingo Molnar
parent 7fd0da4085
commit d4c4d09415
1 changed files with 15 additions and 8 deletions
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23
arch/x86/kernel/setup_64.c
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@ -751,14 +751,21 @@ static void __cpuinit fam10h_check_enable_mmcfg(struct cpuinfo_x86 *c)
/* try to make sure that AP's setting is identical to BSP setting */
if (val & FAM10H_MMIO_CONF_ENABLE) {
u64 base;
base = val & (0xffffULL << 32);
if (fam10h_pci_mmconf_base_status <= 0) {
fam10h_pci_mmconf_base = base;
fam10h_pci_mmconf_base_status = 1;
return;
} else if (fam10h_pci_mmconf_base == base)
return;
unsigned busnbits;
busnbits = (val >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
FAM10H_MMIO_CONF_BUSRANGE_MASK;
/* only trust the one handle 256 buses, if acpi=off */
if (!acpi_pci_disabled || busnbits >= 8) {
u64 base;
base = val & (0xffffULL << 32);
if (fam10h_pci_mmconf_base_status <= 0) {
fam10h_pci_mmconf_base = base;
fam10h_pci_mmconf_base_status = 1;
return;
} else if (fam10h_pci_mmconf_base == base)
return;
}
}
/*