372 lines
9.6 KiB
C
372 lines
9.6 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 <linux/pfn.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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#include <asm/cpu.h>
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#include <asm/stackprotector.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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DEFINE_PER_CPU(int, cpu_number);
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EXPORT_PER_CPU_SYMBOL(cpu_number);
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#ifdef CONFIG_X86_64
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#define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load)
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#else
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#define BOOT_PERCPU_OFFSET 0
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#endif
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DEFINE_PER_CPU(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET;
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EXPORT_PER_CPU_SYMBOL(this_cpu_off);
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unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
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[0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET,
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};
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EXPORT_SYMBOL(__per_cpu_offset);
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/*
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* On x86_64 symbols referenced from code should be reachable using
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* 32bit relocations. Reserve space for static percpu variables in
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* modules so that they are always served from the first chunk which
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* is located at the percpu segment base. On x86_32, anything can
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* address anywhere. No need to reserve space in the first chunk.
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*/
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#ifdef CONFIG_X86_64
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#define PERCPU_FIRST_CHUNK_RESERVE PERCPU_MODULE_RESERVE
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#else
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#define PERCPU_FIRST_CHUNK_RESERVE 0
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#endif
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/**
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* pcpu_need_numa - determine percpu allocation needs to consider NUMA
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*
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* If NUMA is not configured or there is only one NUMA node available,
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* there is no reason to consider NUMA. This function determines
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* whether percpu allocation should consider NUMA or not.
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*
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* RETURNS:
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* true if NUMA should be considered; otherwise, false.
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*/
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static bool __init pcpu_need_numa(void)
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{
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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pg_data_t *last = NULL;
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unsigned int cpu;
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for_each_possible_cpu(cpu) {
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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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last && last != NODE_DATA(node))
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return true;
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last = NODE_DATA(node);
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}
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#endif
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return false;
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}
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/**
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* pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
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* @cpu: cpu to allocate for
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* @size: size allocation in bytes
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* @align: alignment
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*
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* Allocate @size bytes aligned at @align for cpu @cpu. This wrapper
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* does the right thing for NUMA regardless of the current
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* configuration.
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*
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* RETURNS:
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* Pointer to the allocated area on success, NULL on failure.
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*/
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static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
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unsigned long align)
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{
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const unsigned long goal = __pa(MAX_DMA_ADDRESS);
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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int node = early_cpu_to_node(cpu);
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void *ptr;
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if (!node_online(node) || !NODE_DATA(node)) {
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ptr = __alloc_bootmem_nopanic(size, align, goal);
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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 %lu bytes at %016lx\n",
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cpu, size, __pa(ptr));
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} else {
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ptr = __alloc_bootmem_node_nopanic(NODE_DATA(node),
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size, align, goal);
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pr_debug("per cpu data for cpu%d %lu bytes on node%d at "
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"%016lx\n", cpu, size, node, __pa(ptr));
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}
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return ptr;
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#else
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return __alloc_bootmem_nopanic(size, align, goal);
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#endif
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}
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/*
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* Helpers for first chunk memory allocation
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*/
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static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
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{
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return pcpu_alloc_bootmem(cpu, size, align);
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}
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static void __init pcpu_fc_free(void *ptr, size_t size)
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{
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free_bootmem(__pa(ptr), size);
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}
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/*
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* Large page remapping allocator
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*/
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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static void __init pcpul_map(void *ptr, size_t size, void *addr)
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{
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pmd_t *pmd, pmd_v;
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pmd = populate_extra_pmd((unsigned long)addr);
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pmd_v = pfn_pmd(page_to_pfn(virt_to_page(ptr)), PAGE_KERNEL_LARGE);
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set_pmd(pmd, pmd_v);
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}
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static int pcpu_lpage_cpu_distance(unsigned int from, unsigned int to)
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{
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if (early_cpu_to_node(from) == early_cpu_to_node(to))
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return LOCAL_DISTANCE;
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else
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return REMOTE_DISTANCE;
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}
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static int __init setup_pcpu_lpage(bool chosen)
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{
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size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
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size_t dyn_size = reserve - PERCPU_FIRST_CHUNK_RESERVE;
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struct pcpu_alloc_info *ai;
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int rc;
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/* on non-NUMA, embedding is better */
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if (!chosen && !pcpu_need_numa())
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return -EINVAL;
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/* need PSE */
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if (!cpu_has_pse) {
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pr_warning("PERCPU: lpage allocator requires PSE\n");
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return -EINVAL;
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}
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/* allocate and build unit_map */
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ai = pcpu_build_alloc_info(PERCPU_FIRST_CHUNK_RESERVE, dyn_size,
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PMD_SIZE, pcpu_lpage_cpu_distance);
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if (IS_ERR(ai)) {
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pr_warning("PERCPU: failed to build unit_map (%ld)\n",
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PTR_ERR(ai));
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return PTR_ERR(ai);
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}
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/* do the parameters look okay? */
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if (!chosen) {
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size_t vm_size = VMALLOC_END - VMALLOC_START;
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size_t tot_size = 0;
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int group;
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for (group = 0; group < ai->nr_groups; group++)
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tot_size += ai->unit_size * ai->groups[group].nr_units;
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/* don't consume more than 20% of vmalloc area */
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if (tot_size > vm_size / 5) {
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pr_info("PERCPU: too large chunk size %zuMB for "
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"large page remap\n", tot_size >> 20);
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rc = -EINVAL;
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goto out_free;
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}
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}
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rc = pcpu_lpage_first_chunk(ai, pcpu_fc_alloc, pcpu_fc_free, pcpul_map);
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out_free:
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pcpu_free_alloc_info(ai);
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return rc;
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}
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#else
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static int __init setup_pcpu_lpage(bool chosen)
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{
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return -EINVAL;
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}
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#endif
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/*
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* Embedding allocator
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*
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* The first chunk is sized to just contain the static area plus
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* module and dynamic reserves and embedded into linear physical
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* mapping so that it can use PMD mapping without additional TLB
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* pressure.
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*/
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static int __init setup_pcpu_embed(bool chosen)
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{
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size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
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/*
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* If large page isn't supported, there's no benefit in doing
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* this. Also, embedding allocation doesn't play well with
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* NUMA.
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*/
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if (!chosen && (!cpu_has_pse || pcpu_need_numa()))
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return -EINVAL;
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return pcpu_embed_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
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reserve - PERCPU_FIRST_CHUNK_RESERVE,
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PAGE_SIZE, NULL, pcpu_fc_alloc,
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pcpu_fc_free);
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}
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/*
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* Page allocator
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*
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* Boring fallback 4k page allocator. This allocator puts more
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* pressure on PTE TLBs but other than that behaves nicely on both UMA
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* and NUMA.
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*/
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static void __init pcpup_populate_pte(unsigned long addr)
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{
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populate_extra_pte(addr);
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}
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static int __init setup_pcpu_page(void)
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{
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return pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
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pcpu_fc_alloc, pcpu_fc_free,
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pcpup_populate_pte);
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}
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static inline void setup_percpu_segment(int cpu)
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{
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#ifdef CONFIG_X86_32
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struct desc_struct gdt;
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pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF,
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0x2 | DESCTYPE_S, 0x8);
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gdt.s = 1;
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write_gdt_entry(get_cpu_gdt_table(cpu),
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GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
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#endif
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}
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void __init setup_per_cpu_areas(void)
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{
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unsigned int cpu;
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unsigned long delta;
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int rc;
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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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/*
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* Allocate percpu area. If PSE is supported, try to make use
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* of large page mappings. Please read comments on top of
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* each allocator for details.
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*/
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rc = -EINVAL;
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if (pcpu_chosen_fc != PCPU_FC_AUTO) {
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if (pcpu_chosen_fc != PCPU_FC_PAGE) {
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if (pcpu_chosen_fc == PCPU_FC_LPAGE)
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rc = setup_pcpu_lpage(true);
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else
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rc = setup_pcpu_embed(true);
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if (rc < 0)
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pr_warning("PERCPU: %s allocator failed (%d), "
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"falling back to page size\n",
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pcpu_fc_names[pcpu_chosen_fc], rc);
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}
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} else {
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rc = setup_pcpu_lpage(false);
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if (rc < 0)
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rc = setup_pcpu_embed(false);
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}
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if (rc < 0)
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rc = setup_pcpu_page();
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if (rc < 0)
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panic("cannot initialize percpu area (err=%d)", rc);
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/* alrighty, percpu areas up and running */
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delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
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for_each_possible_cpu(cpu) {
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per_cpu_offset(cpu) = delta + pcpu_unit_offsets[cpu];
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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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setup_percpu_segment(cpu);
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setup_stack_canary_segment(cpu);
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/*
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* Copy data used in early init routines from the
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* initial arrays to the per cpu data areas. These
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* arrays then become expendable and the *_early_ptr's
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* are zeroed indicating that the static arrays are
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* gone.
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*/
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#ifdef CONFIG_X86_LOCAL_APIC
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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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#endif
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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) +
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IRQ_STACK_SIZE - 64;
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#ifdef CONFIG_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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#endif
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/*
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* Up to this point, the boot CPU has been using .data.init
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* area. Reload any changed state for the boot CPU.
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*/
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if (cpu == boot_cpu_id)
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switch_to_new_gdt(cpu);
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}
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/* indicate the early static arrays will soon be gone */
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#ifdef CONFIG_X86_LOCAL_APIC
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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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#endif
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#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
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early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
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#endif
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#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
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/*
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* make sure boot cpu node_number is right, when boot cpu is on the
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* node that doesn't have mem installed
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*/
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per_cpu(node_number, boot_cpu_id) = cpu_to_node(boot_cpu_id);
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#endif
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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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