diff options
| author | Yinghai Lu <Yinghai.Lu@Sun.COM> | 2008-02-25 18:41:35 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-26 23:41:04 +0200 |
| commit | d4c4d09415c48ecb621804cd4ec4a7a4d9a3662f (patch) | |
| tree | 9a897fe359e5f2128fc42d492fe97a99ceac025c | |
| parent | 7fd0da4085d5b012a6bdcbbd63da7ead9fc69ad4 (diff) | |
x86: if acpi=off, force setting the mmconf for fam10h
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>
| -rw-r--r-- | arch/x86/kernel/setup_64.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c index 185d3cc9129b..5e269a5dde2e 100644 --- a/arch/x86/kernel/setup_64.c +++ b/arch/x86/kernel/setup_64.c @@ -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; + } } /* |