diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | arch/i386/pci/common.c | 5 | ||||
| -rw-r--r-- | arch/i386/pci/mmconfig.c | 25 | ||||
| -rw-r--r-- | arch/i386/pci/pci.h | 3 | ||||
| -rw-r--r-- | arch/x86_64/pci/mmconfig.c | 25 |
5 files changed, 57 insertions, 3 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index b50595a..7947ced 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1183,6 +1183,8 @@ running once the system is up. Mechanism 2. nommconf [IA-32,X86_64] Disable use of MMCONFIG for PCI Configuration + mmconf [IA-32,X86_64] Force MMCONFIG. This is useful + to override the builtin blacklist. nomsi [MSI] If the PCI_MSI kernel config parameter is enabled, this kernel boot option can be used to disable the use of MSI interrupts system-wide. diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c index 0a362e3..1220dd8 100644 --- a/arch/i386/pci/common.c +++ b/arch/i386/pci/common.c @@ -237,6 +237,11 @@ char * __devinit pcibios_setup(char *str) pci_probe &= ~PCI_PROBE_MMCONF; return NULL; } + /* override DMI blacklist */ + else if (!strcmp(str, "mmconf")) { + pci_probe |= PCI_PROBE_MMCONF_FORCE; + return NULL; + } #endif else if (!strcmp(str, "noacpi")) { acpi_noirq_set(); diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c index 5effb2e..ef5a2fa 100644 --- a/arch/i386/pci/mmconfig.c +++ b/arch/i386/pci/mmconfig.c @@ -12,6 +12,7 @@ #include <linux/pci.h> #include <linux/init.h> #include <linux/acpi.h> +#include <linux/dmi.h> #include <asm/e820.h> #include "pci.h" @@ -187,9 +188,31 @@ static __init void unreachable_devices(void) } } +static int disable_mcfg(struct dmi_system_id *d) +{ + printk("PCI: %s detected. Disabling MCFG.\n", d->ident); + pci_probe &= ~PCI_PROBE_MMCONF; + return 0; +} + +static struct dmi_system_id __initdata dmi_bad_mcfg[] = { + /* Has broken MCFG table that makes the system hang when used */ + { + .callback = disable_mcfg, + .ident = "Intel D3C5105 SDV", + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "Intel"), + DMI_MATCH(DMI_BOARD_NAME, "D26928"), + }, + }, + {} +}; + void __init pci_mmcfg_init(void) { - if ((pci_probe & PCI_PROBE_MMCONF) == 0) + dmi_check_system(dmi_bad_mcfg); + + if ((pci_probe & (PCI_PROBE_MMCONF_FORCE|PCI_PROBE_MMCONF)) == 0) return; acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg); diff --git a/arch/i386/pci/pci.h b/arch/i386/pci/pci.h index bf4e793..49a849b 100644 --- a/arch/i386/pci/pci.h +++ b/arch/i386/pci/pci.h @@ -16,7 +16,8 @@ #define PCI_PROBE_CONF1 0x0002 #define PCI_PROBE_CONF2 0x0004 #define PCI_PROBE_MMCONF 0x0008 -#define PCI_PROBE_MASK 0x000f +#define PCI_PROBE_MMCONF_FORCE 0x0010 +#define PCI_PROBE_MASK 0x00ff #define PCI_NO_SORT 0x0100 #define PCI_BIOS_SORT 0x0200 diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c index 8a4a0f9..2d48a79 100644 --- a/arch/x86_64/pci/mmconfig.c +++ b/arch/x86_64/pci/mmconfig.c @@ -9,6 +9,7 @@ #include <linux/init.h> #include <linux/acpi.h> #include <linux/bitmap.h> +#include <linux/dmi.h> #include <asm/e820.h> #include "pci.h" @@ -164,11 +165,33 @@ static __init void unreachable_devices(void) } } +static int disable_mcfg(struct dmi_system_id *d) +{ + printk("PCI: %s detected. Disabling MCFG.\n", d->ident); + pci_probe &= ~PCI_PROBE_MMCONF; + return 0; +} + +static struct dmi_system_id __initdata dmi_bad_mcfg[] = { + /* Has broken MCFG table that makes the system hang when used */ + { + .callback = disable_mcfg, + .ident = "Intel D3C5105 SDV", + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "Intel"), + DMI_MATCH(DMI_BOARD_NAME, "D26928"), + }, + }, + {} +}; + void __init pci_mmcfg_init(void) { int i; - if ((pci_probe & PCI_PROBE_MMCONF) == 0) + dmi_check_system(dmi_bad_mcfg); + + if ((pci_probe & (PCI_PROBE_MMCONF|PCI_PROBE_MMCONF_FORCE)) == 0) return; acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg); |