379 lines
9.0 KiB
C
379 lines
9.0 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 <asm/smp.h>
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#include <asm/percpu.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/topology.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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#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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unsigned int max_physical_apicid;
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EXPORT_SYMBOL(boot_cpu_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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/* map cpu index to physical APIC ID */
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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
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/* map cpu index to node index */
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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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/* which logical CPUs are on which nodes */
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cpumask_t *node_to_cpumask_map;
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EXPORT_SYMBOL(node_to_cpumask_map);
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/* setup node_to_cpumask_map */
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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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#if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
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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_32
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/*
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* Great future not-so-futuristic plan: make i386 and x86_64 do it
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* the same way
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*/
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unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
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EXPORT_SYMBOL(__per_cpu_offset);
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static inline void setup_cpu_pda_map(void) { }
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#elif !defined(CONFIG_SMP)
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static inline void setup_cpu_pda_map(void) { }
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#else /* CONFIG_SMP && CONFIG_X86_64 */
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/*
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* Allocate cpu_pda pointer table and array via alloc_bootmem.
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*/
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static void __init setup_cpu_pda_map(void)
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{
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char *pda;
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struct x8664_pda **new_cpu_pda;
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unsigned long size;
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int cpu;
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size = roundup(sizeof(struct x8664_pda), cache_line_size());
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/* allocate cpu_pda array and pointer table */
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{
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unsigned long tsize = nr_cpu_ids * sizeof(void *);
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unsigned long asize = size * (nr_cpu_ids - 1);
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tsize = roundup(tsize, cache_line_size());
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new_cpu_pda = alloc_bootmem(tsize + asize);
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pda = (char *)new_cpu_pda + tsize;
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}
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/* initialize pointer table to static pda's */
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for_each_possible_cpu(cpu) {
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if (cpu == 0) {
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/* leave boot cpu pda in place */
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new_cpu_pda[0] = cpu_pda(0);
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continue;
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}
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new_cpu_pda[cpu] = (struct x8664_pda *)pda;
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new_cpu_pda[cpu]->in_bootmem = 1;
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pda += size;
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}
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/* point to new pointer table */
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_cpu_pda = new_cpu_pda;
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}
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#endif
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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 = PERCPU_ENOUGH_ROOM;
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char *ptr;
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int cpu;
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/* Setup cpu_pda map */
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setup_cpu_pda_map();
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/* Copy section for each CPU (we discard the original) */
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size = PERCPU_ENOUGH_ROOM;
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printk(KERN_INFO "PERCPU: Allocating %zd bytes of per cpu data\n",
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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_pages(size);
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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_pages(size);
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printk(KERN_INFO
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"cpu %d has no node %d or node-local memory\n",
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cpu, node);
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}
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else
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ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
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#endif
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per_cpu_offset(cpu) = ptr - __per_cpu_start;
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memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
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}
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printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d, nr_node_ids %d\n",
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NR_CPUS, nr_cpu_ids, nr_node_ids);
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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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}
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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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*/
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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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pr_debug(KERN_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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if (cpu_pda(cpu) && node != NUMA_NO_NODE)
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cpu_pda(cpu)->nodenumber = node;
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if (cpu_to_node_map)
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cpu_to_node_map[cpu] = node;
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else if (per_cpu_offset(cpu))
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per_cpu(x86_cpu_to_node_map, cpu) = node;
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else
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pr_debug("Setting node for non-present cpu %d\n", cpu);
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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[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 = 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 *_node_to_cpumask_ptr(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_ptr(%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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"_node_to_cpumask_ptr(%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_ptr);
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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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