#include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/bootmem.h> #include <linux/percpu.h> #include <linux/kexec.h> #include <linux/crash_dump.h> #include <linux/smp.h> #include <linux/topology.h> #include <asm/sections.h> #include <asm/processor.h> #include <asm/setup.h> #include <asm/mpspec.h> #include <asm/apicdef.h> #include <asm/highmem.h> #include <asm/proto.h> #include <asm/cpumask.h> #ifdef CONFIG_DEBUG_PER_CPU_MAPS # define DBG(x...) printk(KERN_DEBUG x) #else # define DBG(x...) #endif DEFINE_PER_CPU(int, cpu_number); EXPORT_PER_CPU_SYMBOL(cpu_number); #ifdef CONFIG_X86_64 #define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load) #else #define BOOT_PERCPU_OFFSET 0 #endif DEFINE_PER_CPU(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET; EXPORT_PER_CPU_SYMBOL(this_cpu_off); #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = { [0] = BOOT_PERCPU_OFFSET, }; EXPORT_SYMBOL(__per_cpu_offset); /* * Great future plan: * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data. * Always point %gs to its beginning */ void __init setup_per_cpu_areas(void) { ssize_t size; char *ptr; int cpu; /* Copy section for each CPU (we discard the original) */ size = roundup(PERCPU_ENOUGH_ROOM, PAGE_SIZE); pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n", NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids); pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size); for_each_possible_cpu(cpu) { #ifndef CONFIG_NEED_MULTIPLE_NODES ptr = alloc_bootmem_pages(size); #else int node = early_cpu_to_node(cpu); if (!node_online(node) || !NODE_DATA(node)) { ptr = alloc_bootmem_pages(size); pr_info("cpu %d has no node %d or node-local memory\n", cpu, node); pr_debug("per cpu data for cpu%d at %016lx\n", cpu, __pa(ptr)); } else { ptr = alloc_bootmem_pages_node(NODE_DATA(node), size); pr_debug("per cpu data for cpu%d on node%d at %016lx\n", cpu, node, __pa(ptr)); } #endif memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start); per_cpu_offset(cpu) = ptr - __per_cpu_start; per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu); per_cpu(cpu_number, cpu) = cpu; /* * Copy data used in early init routines from the initial arrays to the * per cpu data areas. These arrays then become expendable and the * *_early_ptr's are zeroed indicating that the static arrays are gone. */ #ifdef CONFIG_X86_LOCAL_APIC per_cpu(x86_cpu_to_apicid, cpu) = early_per_cpu_map(x86_cpu_to_apicid, cpu); per_cpu(x86_bios_cpu_apicid, cpu) = early_per_cpu_map(x86_bios_cpu_apicid, cpu); #endif #ifdef CONFIG_X86_64 per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack_union.irq_stack, cpu) + IRQ_STACK_SIZE - 64; #ifdef CONFIG_NUMA per_cpu(x86_cpu_to_node_map, cpu) = early_per_cpu_map(x86_cpu_to_node_map, cpu); #endif /* * Up to this point, CPU0 has been using .data.init * area. Reload %gs offset for CPU0. */ if (cpu == 0) load_gs_base(cpu); #endif DBG("PERCPU: cpu %4d %p\n", cpu, ptr); } /* indicate the early static arrays will soon be gone */ early_per_cpu_ptr(x86_cpu_to_apicid) = NULL; early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL; #if defined(CONFIG_X86_64) && defined(CONFIG_NUMA) early_per_cpu_ptr(x86_cpu_to_node_map) = NULL; #endif /* Setup node to cpumask map */ setup_node_to_cpumask_map(); /* Setup cpu initialized, callin, callout masks */ setup_cpu_local_masks(); } #endif