diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 87a17337c7f6..71d05f481727 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1189,8 +1189,6 @@ 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/kernel/setup.c b/arch/i386/kernel/setup.c index 345ffb7d904d..f1682206d304 100644 --- a/arch/i386/kernel/setup.c +++ b/arch/i386/kernel/setup.c @@ -956,6 +956,38 @@ efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg) return 0; } + /* + * This function checks if the entire range is mapped with type. + * + * Note: this function only works correct if the e820 table is sorted and + * not-overlapping, which is the case + */ +int __init +e820_all_mapped(unsigned long s, unsigned long e, unsigned type) +{ + u64 start = s; + u64 end = e; + int i; + for (i = 0; i < e820.nr_map; i++) { + struct e820entry *ei = &e820.map[i]; + if (type && ei->type != type) + continue; + /* is the region (part) in overlap with the current region ?*/ + if (ei->addr >= end || ei->addr + ei->size <= start) + continue; + /* if the region is at the beginning of we move + * start to the end of the region since it's ok until there + */ + if (ei->addr <= start) + start = ei->addr + ei->size; + /* if start is now at or beyond end, we're done, full + * coverage */ + if (start >= end) + return 1; /* we're done */ + } + return 0; +} + /* * Find the highest page frame number we have available */ diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c index 1220dd828ce3..0a362e3aeac5 100644 --- a/arch/i386/pci/common.c +++ b/arch/i386/pci/common.c @@ -237,11 +237,6 @@ 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 ef5a2faa7d82..972180f738d9 100644 --- a/arch/i386/pci/mmconfig.c +++ b/arch/i386/pci/mmconfig.c @@ -12,7 +12,6 @@ #include #include #include -#include #include #include "pci.h" @@ -188,31 +187,9 @@ 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) { - dmi_check_system(dmi_bad_mcfg); - - if ((pci_probe & (PCI_PROBE_MMCONF_FORCE|PCI_PROBE_MMCONF)) == 0) + if ((pci_probe & PCI_PROBE_MMCONF) == 0) return; acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg); @@ -221,6 +198,15 @@ void __init pci_mmcfg_init(void) (pci_mmcfg_config[0].base_address == 0)) return; + if (!e820_all_mapped(pci_mmcfg_config[0].base_address, + pci_mmcfg_config[0].base_address + MMCONFIG_APER_MIN, + E820_RESERVED)) { + printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %x is not E820-reserved\n", + pci_mmcfg_config[0].base_address); + printk(KERN_ERR "PCI: Not using MMCONFIG.\n"); + return; + } + printk(KERN_INFO "PCI: Using MMCONFIG\n"); raw_pci_ops = &pci_mmcfg; pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF; diff --git a/arch/i386/pci/pci.h b/arch/i386/pci/pci.h index 49a849b3a241..bf4e79335388 100644 --- a/arch/i386/pci/pci.h +++ b/arch/i386/pci/pci.h @@ -16,8 +16,7 @@ #define PCI_PROBE_CONF1 0x0002 #define PCI_PROBE_CONF2 0x0004 #define PCI_PROBE_MMCONF 0x0008 -#define PCI_PROBE_MMCONF_FORCE 0x0010 -#define PCI_PROBE_MASK 0x00ff +#define PCI_PROBE_MASK 0x000f #define PCI_NO_SORT 0x0100 #define PCI_BIOS_SORT 0x0200 diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c index 764bf23c7103..d6d7f731f6f0 100644 --- a/arch/x86_64/kernel/e820.c +++ b/arch/x86_64/kernel/e820.c @@ -108,6 +108,35 @@ e820_any_mapped(unsigned long start, unsigned long end, unsigned type) return 0; } +/* + * This function checks if the entire range is mapped with type. + * + * Note: this function only works correct if the e820 table is sorted and + * not-overlapping, which is the case + */ +int __init e820_all_mapped(unsigned long start, unsigned long end, unsigned type) +{ + int i; + for (i = 0; i < e820.nr_map; i++) { + struct e820entry *ei = &e820.map[i]; + if (type && ei->type != type) + continue; + /* is the region (part) in overlap with the current region ?*/ + if (ei->addr >= end || ei->addr + ei->size <= start) + continue; + + /* if the region is at the beginning of we move + * start to the end of the region since it's ok until there + */ + if (ei->addr <= start) + start = ei->addr + ei->size; + /* if start is now at or beyond end, we're done, full coverage */ + if (start >= end) + return 1; /* we're done */ + } + return 0; +} + /* * Find a free area in a specific range. */ diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c index 2d48a7941d48..3c55c76c6fd5 100644 --- a/arch/x86_64/pci/mmconfig.c +++ b/arch/x86_64/pci/mmconfig.c @@ -9,7 +9,6 @@ #include #include #include -#include #include #include "pci.h" @@ -165,33 +164,11 @@ 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; - dmi_check_system(dmi_bad_mcfg); - - if ((pci_probe & (PCI_PROBE_MMCONF|PCI_PROBE_MMCONF_FORCE)) == 0) + if ((pci_probe & PCI_PROBE_MMCONF) == 0) return; acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg); @@ -200,6 +177,15 @@ void __init pci_mmcfg_init(void) (pci_mmcfg_config[0].base_address == 0)) return; + if (!e820_all_mapped(pci_mmcfg_config[0].base_address, + pci_mmcfg_config[0].base_address + MMCONFIG_APER_MIN, + E820_RESERVED)) { + printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %x is not E820-reserved\n", + pci_mmcfg_config[0].base_address); + printk(KERN_ERR "PCI: Not using MMCONFIG.\n"); + return; + } + /* RED-PEN i386 doesn't do _nocache right now */ pci_mmcfg_virt = kmalloc(sizeof(*pci_mmcfg_virt) * pci_mmcfg_config_num, GFP_KERNEL); if (pci_mmcfg_virt == NULL) {