diff options
Diffstat (limited to 'kernel/include/linux/percpu.h')
| -rw-r--r-- | kernel/include/linux/percpu.h | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/kernel/include/linux/percpu.h b/kernel/include/linux/percpu.h new file mode 100644 index 000000000..53a60a51c --- /dev/null +++ b/kernel/include/linux/percpu.h @@ -0,0 +1,170 @@ +#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 + +#ifndef PERCPU_ENOUGH_ROOM +#define PERCPU_ENOUGH_ROOM \ + (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ + PERCPU_MODULE_RESERVE) +#endif + +#ifdef CONFIG_PREEMPT_RT_FULL + +#define get_local_var(var) (*({ \ + migrate_disable(); \ + this_cpu_ptr(&var); })) + +#define put_local_var(var) do { \ + (void)&(var); \ + migrate_enable(); \ +} while (0) + +# define get_local_ptr(var) ({ \ + migrate_disable(); \ + this_cpu_ptr(var); }) + +# define put_local_ptr(var) do { \ + (void)(var); \ + migrate_enable(); \ +} while (0) + +#else + +#define get_local_var(var) get_cpu_var(var) +#define put_local_var(var) put_cpu_var(var) +#define get_local_ptr(var) get_cpu_ptr(var) +#define put_local_ptr(var) put_cpu_ptr(var) + +#endif + +/* minimum unit size, also is the maximum supported allocation size */ +#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) + +/* + * 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 int __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); + +#if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) +extern void __init setup_per_cpu_areas(void); +#endif +extern void __init percpu_init_late(void); + +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)) + +/* To avoid include hell, as printk can not declare this, we declare it here */ +DECLARE_PER_CPU(printk_func_t, printk_func); + +#endif /* __LINUX_PERCPU_H */ |