| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __LINUX_PERCPU_H |
| #define __LINUX_PERCPU_H |
| |
| #include <linux/mmdebug.h> |
| #include <linux/preempt.h> |
| #include <linux/smp.h> |
| #include <linux/cpumask.h> |
| #include <linux/printk.h> |
| #include <linux/pfn.h> |
| #include <linux/init.h> |
| |
| #include <asm/percpu.h> |
| |
| /* enough to cover all DEFINE_PER_CPUs in modules */ |
| #ifdef CONFIG_MODULES |
| #define PERCPU_MODULE_RESERVE (8 << 10) |
| #else |
| #define PERCPU_MODULE_RESERVE 0 |
| #endif |
| |
| /* minimum unit size, also is the maximum supported allocation size */ |
| #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) |
| |
| /* minimum allocation size and shift in bytes */ |
| #define PCPU_MIN_ALLOC_SHIFT 2 |
| #define PCPU_MIN_ALLOC_SIZE (1 << PCPU_MIN_ALLOC_SHIFT) |
| |
| /* |
| * 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 PAGE_SIZE |
| #define PCPU_BITMAP_BLOCK_BITS (PCPU_BITMAP_BLOCK_SIZE >> \ |
| PCPU_MIN_ALLOC_SHIFT) |
| |
| /* |
| * Percpu allocator can serve percpu allocations before slab is |
| * initialized which allows slab to depend on the percpu allocator. |
| * The following two parameters 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_SLOTS 128 |
| #define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10) |
| |
| /* |
| * 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 (28 << 10) |
| #else |
| #define PERCPU_DYNAMIC_RESERVE (20 << 10) |
| #endif |
| |
| extern void *pcpu_base_addr; |
| extern const unsigned long *pcpu_unit_offsets; |
| |
| struct pcpu_group_info { |
| int nr_units; /* aligned # of units */ |
| unsigned long base_offset; /* base address offset */ |
| unsigned int *cpu_map; /* unit->cpu map, empty |
| * entries contain NR_CPUS */ |
| }; |
| |
| struct pcpu_alloc_info { |
| size_t static_size; |
| size_t reserved_size; |
| size_t dyn_size; |
| size_t unit_size; |
| size_t atom_size; |
| size_t alloc_size; |
| size_t __ai_size; /* internal, don't use */ |
| int nr_groups; /* 0 if grouping unnecessary */ |
| struct pcpu_group_info groups[]; |
| }; |
| |
| enum pcpu_fc { |
| PCPU_FC_AUTO, |
| PCPU_FC_EMBED, |
| PCPU_FC_PAGE, |
| |
| PCPU_FC_NR, |
| }; |
| extern const char * const pcpu_fc_names[PCPU_FC_NR]; |
| |
| extern enum pcpu_fc pcpu_chosen_fc; |
| |
| typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
| size_t align); |
| typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
| typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); |
| typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
| |
| 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); |
| |
| #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
| 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_alloc_fn_t alloc_fn, |
| pcpu_fc_free_fn_t free_fn); |
| #endif |
| |
| #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
| extern int __init pcpu_page_first_chunk(size_t reserved_size, |
| pcpu_fc_alloc_fn_t alloc_fn, |
| pcpu_fc_free_fn_t free_fn, |
| pcpu_fc_populate_pte_fn_t populate_pte_fn); |
| #endif |
| |
| extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); |
| 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 *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp); |
| extern void __percpu *__alloc_percpu(size_t size, size_t align); |
| extern void free_percpu(void __percpu *__pdata); |
| extern phys_addr_t per_cpu_ptr_to_phys(void *addr); |
| |
| #define alloc_percpu_gfp(type, gfp) \ |
| (typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type), \ |
| __alignof__(type), gfp) |
| #define alloc_percpu(type) \ |
| (typeof(type) __percpu *)__alloc_percpu(sizeof(type), \ |
| __alignof__(type)) |
| |
| extern unsigned long pcpu_nr_pages(void); |
| |
| #endif /* __LINUX_PERCPU_H */ |