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author | Suresh Siddha <suresh.b.siddha@intel.com> | 2009-03-30 23:55:30 +0200 |
---|---|---|
committer | Len Brown <len.brown@intel.com> | 2009-04-04 02:08:12 +0200 |
commit | 7237d3de78ff89ec2e18eae5fe962d063024fef5 (patch) | |
tree | 07d0196e9e3122546cc0366c686d363423bfe894 /arch/x86/kernel/acpi | |
parent | Linux 2.6.29 (diff) | |
download | linux-7237d3de78ff89ec2e18eae5fe962d063024fef5.tar.xz linux-7237d3de78ff89ec2e18eae5fe962d063024fef5.zip |
x86, ACPI: add support for x2apic ACPI extensions
All logical processors with APIC ID values of 255 and greater will have their
APIC reported through Processor X2APIC structure (type-9 entry type) and all
logical processors with APIC ID less than 255 will have their APIC reported
through legacy Processor Local APIC (type-0 entry type) only. This is the
same case even for NMI structure reporting.
The Processor X2APIC Affinity structure provides the association between the
X2APIC ID of a logical processor and the proximity domain to which the logical
processor belongs.
For OSPM, Procssor IDs outside the 0-254 range are to be declared as Device()
objects in the ACPI namespace.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'arch/x86/kernel/acpi')
-rw-r--r-- | arch/x86/kernel/acpi/boot.c | 63 |
1 files changed, 59 insertions, 4 deletions
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 7678f10c4568..565e70c7ca93 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -260,6 +260,35 @@ static void __cpuinit acpi_register_lapic(int id, u8 enabled) } static int __init +acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end) +{ + struct acpi_madt_local_x2apic *processor = NULL; + + processor = (struct acpi_madt_local_x2apic *)header; + + if (BAD_MADT_ENTRY(processor, end)) + return -EINVAL; + + acpi_table_print_madt_entry(header); + +#ifdef CONFIG_X86_X2APIC + /* + * We need to register disabled CPU as well to permit + * counting disabled CPUs. This allows us to size + * cpus_possible_map more accurately, to permit + * to not preallocating memory for all NR_CPUS + * when we use CPU hotplug. + */ + acpi_register_lapic(processor->local_apic_id, /* APIC ID */ + processor->lapic_flags & ACPI_MADT_ENABLED); +#else + printk(KERN_WARNING PREFIX "x2apic entry ignored\n"); +#endif + + return 0; +} + +static int __init acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end) { struct acpi_madt_local_apic *processor = NULL; @@ -319,6 +348,25 @@ acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header, } static int __init +acpi_parse_x2apic_nmi(struct acpi_subtable_header *header, + const unsigned long end) +{ + struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL; + + x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header; + + if (BAD_MADT_ENTRY(x2apic_nmi, end)) + return -EINVAL; + + acpi_table_print_madt_entry(header); + + if (x2apic_nmi->lint != 1) + printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n"); + + return 0; +} + +static int __init acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end) { struct acpi_madt_local_apic_nmi *lapic_nmi = NULL; @@ -823,6 +871,7 @@ static int __init early_acpi_parse_madt_lapic_addr_ovr(void) static int __init acpi_parse_madt_lapic_entries(void) { int count; + int x2count = 0; if (!cpu_has_apic) return -ENODEV; @@ -846,22 +895,28 @@ static int __init acpi_parse_madt_lapic_entries(void) count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_sapic, MAX_APICS); - if (!count) + if (!count) { + x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC, + acpi_parse_x2apic, MAX_APICS); count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_parse_lapic, MAX_APICS); - if (!count) { + } + if (!count && !x2count) { printk(KERN_ERR PREFIX "No LAPIC entries present\n"); /* TBD: Cleanup to allow fallback to MPS */ return -ENODEV; - } else if (count < 0) { + } else if (count < 0 || x2count < 0) { printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n"); /* TBD: Cleanup to allow fallback to MPS */ return count; } + x2count = + acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI, + acpi_parse_x2apic_nmi, 0); count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0); - if (count < 0) { + if (count < 0 || x2count < 0) { printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n"); /* TBD: Cleanup to allow fallback to MPS */ return count; |