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298 lines
8.4 KiB
298 lines
8.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/kernel.h> |
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#include <linux/export.h> |
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#include <linux/init.h> |
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#include <linux/memblock.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/desc.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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DEFINE_PER_CPU_READ_MOSTLY(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_READ_MOSTLY(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] __ro_after_init = { |
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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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#ifdef CONFIG_X86_32 |
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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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#endif |
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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 = memblock_alloc_from(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 = memblock_alloc_try_nid(size, align, goal, |
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MEMBLOCK_ALLOC_ACCESSIBLE, |
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node); |
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pr_debug("per cpu data for cpu%d %lu bytes on node%d at %016lx\n", |
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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 memblock_alloc_from(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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memblock_free(__pa(ptr), size); |
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} |
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static int __init pcpu_cpu_distance(unsigned int from, unsigned int to) |
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{ |
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#ifdef CONFIG_NEED_MULTIPLE_NODES |
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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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#else |
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return LOCAL_DISTANCE; |
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#endif |
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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 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 d = GDT_ENTRY_INIT(0x8092, per_cpu_offset(cpu), |
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0xFFFFF); |
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write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_PERCPU, &d, 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:%u nr_node_ids:%u\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. Embedding allocator is our favorite; |
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* however, on NUMA configurations, it can result in very |
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* sparse unit mapping and vmalloc area isn't spacious enough |
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* on 32bit. Use page in that case. |
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*/ |
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#ifdef CONFIG_X86_32 |
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if (pcpu_chosen_fc == PCPU_FC_AUTO && pcpu_need_numa()) |
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pcpu_chosen_fc = PCPU_FC_PAGE; |
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#endif |
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rc = -EINVAL; |
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if (pcpu_chosen_fc != PCPU_FC_PAGE) { |
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const size_t dyn_size = PERCPU_MODULE_RESERVE + |
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PERCPU_DYNAMIC_RESERVE - PERCPU_FIRST_CHUNK_RESERVE; |
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size_t atom_size; |
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/* |
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* On 64bit, use PMD_SIZE for atom_size so that embedded |
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* percpu areas are aligned to PMD. This, in the future, |
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* can also allow using PMD mappings in vmalloc area. Use |
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* PAGE_SIZE on 32bit as vmalloc space is highly contended |
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* and large vmalloc area allocs can easily fail. |
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*/ |
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#ifdef CONFIG_X86_64 |
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atom_size = PMD_SIZE; |
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#else |
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atom_size = PAGE_SIZE; |
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#endif |
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rc = pcpu_embed_first_chunk(PERCPU_FIRST_CHUNK_RESERVE, |
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dyn_size, atom_size, |
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pcpu_cpu_distance, |
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pcpu_fc_alloc, pcpu_fc_free); |
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if (rc < 0) |
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pr_warn("%s allocator failed (%d), 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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if (rc < 0) |
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rc = 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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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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per_cpu(x86_cpu_to_acpiid, cpu) = |
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early_per_cpu_map(x86_cpu_to_acpiid, cpu); |
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#endif |
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#ifdef CONFIG_X86_32 |
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per_cpu(x86_cpu_to_logical_apicid, cpu) = |
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early_per_cpu_map(x86_cpu_to_logical_apicid, cpu); |
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#endif |
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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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/* |
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* Ensure that the boot cpu numa_node is correct when the boot |
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* cpu is on a node that doesn't have memory installed. |
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* Also cpu_up() will call cpu_to_node() for APs when |
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* MEMORY_HOTPLUG is defined, before per_cpu(numa_node) is set |
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* up later with c_init aka intel_init/amd_init. |
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* So set them all (boot cpu and all APs). |
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*/ |
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set_cpu_numa_node(cpu, early_cpu_to_node(cpu)); |
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#endif |
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/* |
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* Up to this point, the boot CPU has been using .init.data |
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* area. Reload any changed state for the boot CPU. |
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*/ |
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if (!cpu) |
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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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early_per_cpu_ptr(x86_cpu_to_acpiid) = NULL; |
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#endif |
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#ifdef CONFIG_X86_32 |
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early_per_cpu_ptr(x86_cpu_to_logical_apicid) = NULL; |
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#endif |
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#ifdef 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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/* 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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* Sync back kernel address range again. We already did this in |
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* setup_arch(), but percpu data also needs to be available in |
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* the smpboot asm and arch_sync_kernel_mappings() doesn't sync to |
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* swapper_pg_dir on 32-bit. The per-cpu mappings need to be available |
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* there too. |
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* |
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* FIXME: Can the later sync in setup_cpu_entry_areas() replace |
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* this call? |
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*/ |
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sync_initial_page_table(); |
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}
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