/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __LINUX_PERCPU_H #define __LINUX_PERCPU_H #include <linux/alloc_tag.h> #include <linux/mmdebug.h> #include <linux/preempt.h> #include <linux/smp.h> #include <linux/pfn.h> #include <linux/init.h> #include <linux/cleanup.h> #include <linux/sched.h> #include <asm/percpu.h> /* enough to cover all DEFINE_PER_CPUs in modules */ #ifdef CONFIG_MODULES #ifdef CONFIG_MEM_ALLOC_PROFILING #define PERCPU_MODULE_RESERVE … #else #define PERCPU_MODULE_RESERVE … #endif #else #define PERCPU_MODULE_RESERVE … #endif /* minimum unit size, also is the maximum supported allocation size */ #define PCPU_MIN_UNIT_SIZE … /* minimum allocation size and shift in bytes */ #define PCPU_MIN_ALLOC_SHIFT … #define PCPU_MIN_ALLOC_SIZE … /* * The PCPU_BITMAP_BLOCK_SIZE must be the same size as PAGE_SIZE as the * updating of hints is used to manage the nr_empty_pop_pages in both * the chunk and globally. */ #define PCPU_BITMAP_BLOCK_SIZE … #define PCPU_BITMAP_BLOCK_BITS … #ifdef CONFIG_RANDOM_KMALLOC_CACHES #define PERCPU_DYNAMIC_SIZE_SHIFT … #else #define PERCPU_DYNAMIC_SIZE_SHIFT … #endif /* * Percpu allocator can serve percpu allocations before slab is * initialized which allows slab to depend on the percpu allocator. * The following parameter decide how much resource to preallocate * for this. Keep PERCPU_DYNAMIC_RESERVE equal to or larger than * PERCPU_DYNAMIC_EARLY_SIZE. */ #define PERCPU_DYNAMIC_EARLY_SIZE … /* * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy * back on the first chunk for dynamic percpu allocation if arch is * manually allocating and mapping it for faster access (as a part of * large page mapping for example). * * The following values give between one and two pages of free space * after typical minimal boot (2-way SMP, single disk and NIC) with * both defconfig and a distro config on x86_64 and 32. More * intelligent way to determine this would be nice. */ #if BITS_PER_LONG > 32 #define PERCPU_DYNAMIC_RESERVE … #else #define PERCPU_DYNAMIC_RESERVE … #endif extern void *pcpu_base_addr; extern const unsigned long *pcpu_unit_offsets; struct pcpu_group_info { … }; struct pcpu_alloc_info { … }; enum pcpu_fc { … }; extern const char * const pcpu_fc_names[PCPU_FC_NR]; extern enum pcpu_fc pcpu_chosen_fc; pcpu_fc_cpu_to_node_fn_t; pcpu_fc_cpu_distance_fn_t; extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, int nr_units); extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); extern void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, void *base_addr); extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, size_t atom_size, pcpu_fc_cpu_distance_fn_t cpu_distance_fn, pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn); #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK void __init pcpu_populate_pte(unsigned long addr); extern int __init pcpu_page_first_chunk(size_t reserved_size, pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn); #endif extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr); extern bool is_kernel_percpu_address(unsigned long addr); #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) extern void __init setup_per_cpu_areas(void); #endif extern void __percpu *pcpu_alloc_noprof(size_t size, size_t align, bool reserved, gfp_t gfp) __alloc_size(1); extern size_t pcpu_alloc_size(void __percpu *__pdata); #define __alloc_percpu_gfp(_size, _align, _gfp) … #define __alloc_percpu(_size, _align) … #define __alloc_reserved_percpu(_size, _align) … #define alloc_percpu_gfp(type, gfp) … #define alloc_percpu(type) … #define alloc_percpu_noprof(type) … extern void free_percpu(void __percpu *__pdata); DEFINE_FREE(…) extern phys_addr_t per_cpu_ptr_to_phys(void *addr); extern unsigned long pcpu_nr_pages(void); #endif /* __LINUX_PERCPU_H */
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