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148 lines
4.7 KiB
148 lines
4.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_PERCPU_H |
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#define __LINUX_PERCPU_H |
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#include <linux/mmdebug.h> |
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#include <linux/preempt.h> |
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#include <linux/smp.h> |
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#include <linux/cpumask.h> |
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#include <linux/printk.h> |
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#include <linux/pfn.h> |
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#include <linux/init.h> |
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#include <asm/percpu.h> |
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/* enough to cover all DEFINE_PER_CPUs in modules */ |
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#ifdef CONFIG_MODULES |
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#define PERCPU_MODULE_RESERVE (8 << 10) |
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#else |
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#define PERCPU_MODULE_RESERVE 0 |
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#endif |
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/* minimum unit size, also is the maximum supported allocation size */ |
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#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) |
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/* minimum allocation size and shift in bytes */ |
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#define PCPU_MIN_ALLOC_SHIFT 2 |
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#define PCPU_MIN_ALLOC_SIZE (1 << PCPU_MIN_ALLOC_SHIFT) |
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/* |
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* The PCPU_BITMAP_BLOCK_SIZE must be the same size as PAGE_SIZE as the |
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* updating of hints is used to manage the nr_empty_pop_pages in both |
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* the chunk and globally. |
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*/ |
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#define PCPU_BITMAP_BLOCK_SIZE PAGE_SIZE |
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#define PCPU_BITMAP_BLOCK_BITS (PCPU_BITMAP_BLOCK_SIZE >> \ |
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PCPU_MIN_ALLOC_SHIFT) |
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/* |
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* Percpu allocator can serve percpu allocations before slab is |
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* initialized which allows slab to depend on the percpu allocator. |
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* The following two parameters decide how much resource to |
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* preallocate for this. Keep PERCPU_DYNAMIC_RESERVE equal to or |
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* larger than PERCPU_DYNAMIC_EARLY_SIZE. |
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*/ |
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#define PERCPU_DYNAMIC_EARLY_SLOTS 128 |
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#define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10) |
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/* |
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* PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy |
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* back on the first chunk for dynamic percpu allocation if arch is |
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* manually allocating and mapping it for faster access (as a part of |
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* large page mapping for example). |
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* |
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* The following values give between one and two pages of free space |
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* after typical minimal boot (2-way SMP, single disk and NIC) with |
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* both defconfig and a distro config on x86_64 and 32. More |
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* intelligent way to determine this would be nice. |
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*/ |
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#if BITS_PER_LONG > 32 |
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#define PERCPU_DYNAMIC_RESERVE (28 << 10) |
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#else |
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#define PERCPU_DYNAMIC_RESERVE (20 << 10) |
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#endif |
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extern void *pcpu_base_addr; |
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extern const unsigned long *pcpu_unit_offsets; |
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struct pcpu_group_info { |
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int nr_units; /* aligned # of units */ |
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unsigned long base_offset; /* base address offset */ |
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unsigned int *cpu_map; /* unit->cpu map, empty |
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* entries contain NR_CPUS */ |
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}; |
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struct pcpu_alloc_info { |
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size_t static_size; |
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size_t reserved_size; |
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size_t dyn_size; |
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size_t unit_size; |
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size_t atom_size; |
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size_t alloc_size; |
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size_t __ai_size; /* internal, don't use */ |
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int nr_groups; /* 0 if grouping unnecessary */ |
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struct pcpu_group_info groups[]; |
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}; |
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enum pcpu_fc { |
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PCPU_FC_AUTO, |
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PCPU_FC_EMBED, |
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PCPU_FC_PAGE, |
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PCPU_FC_NR, |
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}; |
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extern const char * const pcpu_fc_names[PCPU_FC_NR]; |
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extern enum pcpu_fc pcpu_chosen_fc; |
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typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
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size_t align); |
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typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
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typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); |
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typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
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extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
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int nr_units); |
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extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); |
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extern void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
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void *base_addr); |
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#ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
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extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, |
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size_t atom_size, |
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pcpu_fc_cpu_distance_fn_t cpu_distance_fn, |
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pcpu_fc_alloc_fn_t alloc_fn, |
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pcpu_fc_free_fn_t free_fn); |
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#endif |
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#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
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extern int __init pcpu_page_first_chunk(size_t reserved_size, |
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pcpu_fc_alloc_fn_t alloc_fn, |
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pcpu_fc_free_fn_t free_fn, |
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pcpu_fc_populate_pte_fn_t populate_pte_fn); |
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#endif |
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extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); |
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extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr); |
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extern bool is_kernel_percpu_address(unsigned long addr); |
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#if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) |
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extern void __init setup_per_cpu_areas(void); |
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#endif |
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extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp); |
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extern void __percpu *__alloc_percpu(size_t size, size_t align); |
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extern void free_percpu(void __percpu *__pdata); |
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extern phys_addr_t per_cpu_ptr_to_phys(void *addr); |
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#define alloc_percpu_gfp(type, gfp) \ |
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(typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type), \ |
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__alignof__(type), gfp) |
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#define alloc_percpu(type) \ |
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(typeof(type) __percpu *)__alloc_percpu(sizeof(type), \ |
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__alignof__(type)) |
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extern unsigned long pcpu_nr_pages(void); |
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#endif /* __LINUX_PERCPU_H */
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