411 lines
9.8 KiB
C
411 lines
9.8 KiB
C
#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/percpu.h>
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#include <linux/kexec.h>
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#include <linux/crash_dump.h>
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#include <linux/smp.h>
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#include <linux/topology.h>
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#include <asm/sections.h>
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#include <asm/processor.h>
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#include <asm/setup.h>
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#include <asm/mpspec.h>
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#include <asm/apicdef.h>
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#include <asm/highmem.h>
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#include <asm/proto.h>
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#include <asm/cpumask.h>
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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# define DBG(x...) printk(KERN_DEBUG x)
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#else
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# define DBG(x...)
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#endif
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/*
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* Could be inside CONFIG_HAVE_SETUP_PER_CPU_AREA with other stuff but
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* voyager wants cpu_number too.
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*/
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#ifdef CONFIG_SMP
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DEFINE_PER_CPU(int, cpu_number);
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EXPORT_PER_CPU_SYMBOL(cpu_number);
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#endif
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#ifdef CONFIG_X86_LOCAL_APIC
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unsigned int num_processors;
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unsigned disabled_cpus __cpuinitdata;
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/* Processor that is doing the boot up */
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unsigned int boot_cpu_physical_apicid = -1U;
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EXPORT_SYMBOL(boot_cpu_physical_apicid);
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unsigned int max_physical_apicid;
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/* Bitmask of physically existing CPUs */
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physid_mask_t phys_cpu_present_map;
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#endif
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/*
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* Map cpu index to physical APIC ID
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*/
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DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
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DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
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EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
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EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
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#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
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#define X86_64_NUMA 1 /* (used later) */
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DEFINE_PER_CPU(int, node_number) = 0;
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EXPORT_PER_CPU_SYMBOL(node_number);
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/*
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* Map cpu index to node index
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*/
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DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
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EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
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/*
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* Which logical CPUs are on which nodes
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*/
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cpumask_t *node_to_cpumask_map;
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EXPORT_SYMBOL(node_to_cpumask_map);
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/*
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* Setup node_to_cpumask_map
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*/
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static void __init setup_node_to_cpumask_map(void);
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#else
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static inline void setup_node_to_cpumask_map(void) { }
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#endif
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#ifdef CONFIG_X86_64
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/* correctly size the local cpu masks */
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static void setup_cpu_local_masks(void)
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{
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alloc_bootmem_cpumask_var(&cpu_initialized_mask);
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alloc_bootmem_cpumask_var(&cpu_callin_mask);
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alloc_bootmem_cpumask_var(&cpu_callout_mask);
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alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask);
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}
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#else /* CONFIG_X86_32 */
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static inline void setup_cpu_local_masks(void)
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{
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}
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#endif /* CONFIG_X86_32 */
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#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
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/*
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* Copy data used in early init routines from the initial arrays to the
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* per cpu data areas. These arrays then become expendable and the
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* *_early_ptr's are zeroed indicating that the static arrays are gone.
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*/
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static void __init setup_per_cpu_maps(void)
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{
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int cpu;
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for_each_possible_cpu(cpu) {
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per_cpu(x86_cpu_to_apicid, cpu) =
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early_per_cpu_map(x86_cpu_to_apicid, cpu);
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per_cpu(x86_bios_cpu_apicid, cpu) =
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early_per_cpu_map(x86_bios_cpu_apicid, cpu);
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#ifdef X86_64_NUMA
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per_cpu(x86_cpu_to_node_map, cpu) =
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early_per_cpu_map(x86_cpu_to_node_map, cpu);
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#endif
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}
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/* indicate the early static arrays will soon be gone */
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early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
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early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
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#ifdef X86_64_NUMA
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early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
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#endif
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}
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#ifdef CONFIG_X86_64
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unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
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[0] = (unsigned long)__per_cpu_load,
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};
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#else
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unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
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#endif
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EXPORT_SYMBOL(__per_cpu_offset);
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/*
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* Great future plan:
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* Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
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* Always point %gs to its beginning
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*/
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void __init setup_per_cpu_areas(void)
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{
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ssize_t size, old_size;
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char *ptr;
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int cpu;
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unsigned long align = 1;
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/* Copy section for each CPU (we discard the original) */
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old_size = PERCPU_ENOUGH_ROOM;
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align = max_t(unsigned long, PAGE_SIZE, align);
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size = roundup(old_size, align);
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pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
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NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
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pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size);
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for_each_possible_cpu(cpu) {
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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ptr = __alloc_bootmem(size, align,
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__pa(MAX_DMA_ADDRESS));
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#else
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int node = early_cpu_to_node(cpu);
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if (!node_online(node) || !NODE_DATA(node)) {
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ptr = __alloc_bootmem(size, align,
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__pa(MAX_DMA_ADDRESS));
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pr_info("cpu %d has no node %d or node-local memory\n",
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cpu, node);
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pr_debug("per cpu data for cpu%d at %016lx\n",
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cpu, __pa(ptr));
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} else {
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ptr = __alloc_bootmem_node(NODE_DATA(node), size, align,
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__pa(MAX_DMA_ADDRESS));
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pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
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cpu, node, __pa(ptr));
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}
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#endif
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memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start);
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per_cpu_offset(cpu) = ptr - __per_cpu_start;
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per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
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per_cpu(cpu_number, cpu) = cpu;
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#ifdef CONFIG_X86_64
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per_cpu(irq_stack_ptr, cpu) =
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per_cpu(irq_stack_union.irq_stack, cpu) + IRQ_STACK_SIZE - 64;
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/*
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* Up to this point, CPU0 has been using .data.init
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* area. Reload %gs offset for CPU0.
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*/
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if (cpu == 0)
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load_gs_base(cpu);
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#endif
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DBG("PERCPU: cpu %4d %p\n", cpu, ptr);
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}
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/* Setup percpu data maps */
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setup_per_cpu_maps();
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/* Setup node to cpumask map */
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setup_node_to_cpumask_map();
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/* Setup cpu initialized, callin, callout masks */
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setup_cpu_local_masks();
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}
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#endif
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#ifdef X86_64_NUMA
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/*
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* Allocate node_to_cpumask_map based on number of available nodes
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* Requires node_possible_map to be valid.
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*
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* Note: node_to_cpumask() is not valid until after this is done.
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* (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
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*/
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static void __init setup_node_to_cpumask_map(void)
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{
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unsigned int node, num = 0;
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cpumask_t *map;
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/* setup nr_node_ids if not done yet */
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if (nr_node_ids == MAX_NUMNODES) {
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for_each_node_mask(node, node_possible_map)
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num = node;
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nr_node_ids = num + 1;
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}
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/* allocate the map */
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map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
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DBG("node_to_cpumask_map at %p for %d nodes\n", map, nr_node_ids);
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pr_debug("Node to cpumask map at %p for %d nodes\n",
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map, nr_node_ids);
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/* node_to_cpumask() will now work */
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node_to_cpumask_map = map;
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}
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void __cpuinit numa_set_node(int cpu, int node)
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{
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int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
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/* early setting, no percpu area yet */
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if (cpu_to_node_map) {
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cpu_to_node_map[cpu] = node;
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return;
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}
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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if (cpu >= nr_cpu_ids || !per_cpu_offset(cpu)) {
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printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
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dump_stack();
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return;
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}
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#endif
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per_cpu(x86_cpu_to_node_map, cpu) = node;
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if (node != NUMA_NO_NODE)
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per_cpu(node_number, cpu) = node;
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}
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void __cpuinit numa_clear_node(int cpu)
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{
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numa_set_node(cpu, NUMA_NO_NODE);
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}
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#ifndef CONFIG_DEBUG_PER_CPU_MAPS
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void __cpuinit numa_add_cpu(int cpu)
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{
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cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
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}
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void __cpuinit numa_remove_cpu(int cpu)
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{
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cpu_clear(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
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}
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#else /* CONFIG_DEBUG_PER_CPU_MAPS */
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/*
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* --------- debug versions of the numa functions ---------
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*/
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static void __cpuinit numa_set_cpumask(int cpu, int enable)
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{
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int node = early_cpu_to_node(cpu);
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cpumask_t *mask;
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char buf[64];
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if (node_to_cpumask_map == NULL) {
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printk(KERN_ERR "node_to_cpumask_map NULL\n");
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dump_stack();
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return;
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}
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mask = &node_to_cpumask_map[node];
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if (enable)
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cpu_set(cpu, *mask);
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else
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cpu_clear(cpu, *mask);
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cpulist_scnprintf(buf, sizeof(buf), mask);
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printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
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enable ? "numa_add_cpu" : "numa_remove_cpu", cpu, node, buf);
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}
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void __cpuinit numa_add_cpu(int cpu)
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{
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numa_set_cpumask(cpu, 1);
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}
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void __cpuinit numa_remove_cpu(int cpu)
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{
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numa_set_cpumask(cpu, 0);
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}
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int cpu_to_node(int cpu)
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{
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if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
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printk(KERN_WARNING
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"cpu_to_node(%d): usage too early!\n", cpu);
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dump_stack();
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return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
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}
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return per_cpu(x86_cpu_to_node_map, cpu);
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}
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EXPORT_SYMBOL(cpu_to_node);
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/*
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* Same function as cpu_to_node() but used if called before the
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* per_cpu areas are setup.
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*/
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int early_cpu_to_node(int cpu)
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{
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if (early_per_cpu_ptr(x86_cpu_to_node_map))
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return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
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if (!per_cpu_offset(cpu)) {
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printk(KERN_WARNING
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"early_cpu_to_node(%d): no per_cpu area!\n", cpu);
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dump_stack();
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return NUMA_NO_NODE;
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}
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return per_cpu(x86_cpu_to_node_map, cpu);
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}
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/* empty cpumask */
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static const cpumask_t cpu_mask_none;
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/*
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* Returns a pointer to the bitmask of CPUs on Node 'node'.
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*/
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const cpumask_t *cpumask_of_node(int node)
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{
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if (node_to_cpumask_map == NULL) {
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printk(KERN_WARNING
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"cpumask_of_node(%d): no node_to_cpumask_map!\n",
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node);
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dump_stack();
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return (const cpumask_t *)&cpu_online_map;
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}
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if (node >= nr_node_ids) {
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printk(KERN_WARNING
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"cpumask_of_node(%d): node > nr_node_ids(%d)\n",
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node, nr_node_ids);
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dump_stack();
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return &cpu_mask_none;
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}
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return &node_to_cpumask_map[node];
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}
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EXPORT_SYMBOL(cpumask_of_node);
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/*
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* Returns a bitmask of CPUs on Node 'node'.
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*
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* Side note: this function creates the returned cpumask on the stack
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* so with a high NR_CPUS count, excessive stack space is used. The
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* node_to_cpumask_ptr function should be used whenever possible.
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*/
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cpumask_t node_to_cpumask(int node)
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{
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if (node_to_cpumask_map == NULL) {
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printk(KERN_WARNING
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"node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
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dump_stack();
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return cpu_online_map;
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}
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if (node >= nr_node_ids) {
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printk(KERN_WARNING
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"node_to_cpumask(%d): node > nr_node_ids(%d)\n",
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node, nr_node_ids);
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dump_stack();
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return cpu_mask_none;
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}
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return node_to_cpumask_map[node];
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}
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EXPORT_SYMBOL(node_to_cpumask);
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/*
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* --------- end of debug versions of the numa functions ---------
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*/
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#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
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#endif /* X86_64_NUMA */
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