Messages in this thread Patch in this message | | | Date | Tue, 28 Feb 2006 16:16:00 -0800 | From | Ashok Raj <> | Subject | [patch 3/5] Support physical cpu hotplug for x86_64. |
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This patch enables ACPI based physical CPU hotplug support for x86_64. Implements acpi_map_lsapic() and acpi_unmap_lsapic() to support physical cpu hotplug.
Signed-off-by: Ashok Raj <ashok.raj@intel.com> ------------------------------------------------------------------ arch/i386/kernel/acpi/boot.c | 69 ++++++++++++++++++++++++++++++++++++++++--- 1 files changed, 65 insertions(+), 4 deletions(-)
Index: linux-2.6.16-rc4-mm1/arch/i386/kernel/acpi/boot.c =================================================================== --- linux-2.6.16-rc4-mm1.orig/arch/i386/kernel/acpi/boot.c +++ linux-2.6.16-rc4-mm1/arch/i386/kernel/acpi/boot.c @@ -25,6 +25,7 @@ #include <linux/init.h> #include <linux/config.h> +#include <linux/cpumask.h> #include <linux/acpi.h> #include <linux/efi.h> #include <linux/module.h> @@ -505,16 +506,76 @@ EXPORT_SYMBOL(acpi_register_gsi); #ifdef CONFIG_ACPI_HOTPLUG_CPU int acpi_map_lsapic(acpi_handle handle, int *pcpu) { - /* TBD */ - return -EINVAL; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + struct acpi_table_lapic *lapic; + cpumask_t tmp_map, new_map; + u8 physid; + int cpu; + + if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) + return -EINVAL; + + if (!buffer.length || !buffer.pointer) + return -EINVAL; + + obj = buffer.pointer; + if (obj->type != ACPI_TYPE_BUFFER || + obj->buffer.length < sizeof(*lapic)) { + acpi_os_free(buffer.pointer); + return -EINVAL; + } + + lapic = (struct acpi_table_lapic *)obj->buffer.pointer; + + if ((lapic->header.type != ACPI_MADT_LAPIC) || + (!lapic->flags.enabled)) { + acpi_os_free(buffer.pointer); + return -EINVAL; + } + + physid = lapic->id; + + acpi_os_free(buffer.pointer); + buffer.length = ACPI_ALLOCATE_BUFFER; + buffer.pointer = NULL; + + tmp_map = cpu_present_map; + mp_register_lapic(physid, lapic->flags.enabled); + + /* + * If mp_register_lapic successfully generates a new logical cpu + * number, then the following will get us exactly what was mapped + */ + cpus_andnot(new_map, cpu_present_map, tmp_map); + if (cpus_empty(new_map)) { + printk ("Unable to map lapic to logical cpu number\n"); + return -EINVAL; + } + + cpu = first_cpu(new_map); + + *pcpu = cpu; + return 0; } EXPORT_SYMBOL(acpi_map_lsapic); int acpi_unmap_lsapic(int cpu) { - /* TBD */ - return -EINVAL; + int i; + + for_each_cpu(i) { + if (x86_acpiid_to_apicid[i] == x86_cpu_to_apicid[cpu]) { + x86_acpiid_to_apicid[i] = -1; + break; + } + } + x86_cpu_to_apicid[cpu] = -1; + cpu_clear(cpu, cpu_present_map); + num_processors--; + + return (0); } EXPORT_SYMBOL(acpi_unmap_lsapic); --
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