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Diffstat (limited to 'include/linux/memblock.h')
| -rw-r--r-- | include/linux/memblock.h | 605 |
1 files changed, 605 insertions, 0 deletions
diff --git a/include/linux/memblock.h b/include/linux/memblock.h new file mode 100644 index 000000000..1c1072e3c --- /dev/null +++ b/include/linux/memblock.h @@ -0,0 +1,605 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _LINUX_MEMBLOCK_H +#define _LINUX_MEMBLOCK_H + +/* + * Logical memory blocks. + * + * Copyright (C) 2001 Peter Bergner, IBM Corp. + */ + +#include <linux/init.h> +#include <linux/mm.h> +#include <asm/dma.h> + +extern unsigned long max_low_pfn; +extern unsigned long min_low_pfn; + +/* + * highest page + */ +extern unsigned long max_pfn; +/* + * highest possible page + */ +extern unsigned long long max_possible_pfn; + +/** + * enum memblock_flags - definition of memory region attributes + * @MEMBLOCK_NONE: no special request + * @MEMBLOCK_HOTPLUG: memory region indicated in the firmware-provided memory + * map during early boot as hot(un)pluggable system RAM (e.g., memory range + * that might get hotunplugged later). With "movable_node" set on the kernel + * commandline, try keeping this memory region hotunpluggable. Does not apply + * to memblocks added ("hotplugged") after early boot. + * @MEMBLOCK_MIRROR: mirrored region + * @MEMBLOCK_NOMAP: don't add to kernel direct mapping and treat as + * reserved in the memory map; refer to memblock_mark_nomap() description + * for further details + * @MEMBLOCK_DRIVER_MANAGED: memory region that is always detected and added + * via a driver, and never indicated in the firmware-provided memory map as + * system RAM. This corresponds to IORESOURCE_SYSRAM_DRIVER_MANAGED in the + * kernel resource tree. + */ +enum memblock_flags { + MEMBLOCK_NONE = 0x0, /* No special request */ + MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */ + MEMBLOCK_MIRROR = 0x2, /* mirrored region */ + MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */ + MEMBLOCK_DRIVER_MANAGED = 0x8, /* always detected via a driver */ +}; + +/** + * struct memblock_region - represents a memory region + * @base: base address of the region + * @size: size of the region + * @flags: memory region attributes + * @nid: NUMA node id + */ +struct memblock_region { + phys_addr_t base; + phys_addr_t size; + enum memblock_flags flags; +#ifdef CONFIG_NUMA + int nid; +#endif +}; + +/** + * struct memblock_type - collection of memory regions of certain type + * @cnt: number of regions + * @max: size of the allocated array + * @total_size: size of all regions + * @regions: array of regions + * @name: the memory type symbolic name + */ +struct memblock_type { + unsigned long cnt; + unsigned long max; + phys_addr_t total_size; + struct memblock_region *regions; + char *name; +}; + +/** + * struct memblock - memblock allocator metadata + * @bottom_up: is bottom up direction? + * @current_limit: physical address of the current allocation limit + * @memory: usable memory regions + * @reserved: reserved memory regions + */ +struct memblock { + bool bottom_up; /* is bottom up direction? */ + phys_addr_t current_limit; + struct memblock_type memory; + struct memblock_type reserved; +}; + +extern struct memblock memblock; + +#ifndef CONFIG_ARCH_KEEP_MEMBLOCK +#define __init_memblock __meminit +#define __initdata_memblock __meminitdata +void memblock_discard(void); +#else +#define __init_memblock +#define __initdata_memblock +static inline void memblock_discard(void) {} +#endif + +void memblock_allow_resize(void); +int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid, + enum memblock_flags flags); +int memblock_add(phys_addr_t base, phys_addr_t size); +int memblock_remove(phys_addr_t base, phys_addr_t size); +int memblock_phys_free(phys_addr_t base, phys_addr_t size); +int memblock_reserve(phys_addr_t base, phys_addr_t size); +#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP +int memblock_physmem_add(phys_addr_t base, phys_addr_t size); +#endif +void memblock_trim_memory(phys_addr_t align); +bool memblock_overlaps_region(struct memblock_type *type, + phys_addr_t base, phys_addr_t size); +int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); +int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); +int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); +int memblock_mark_nomap(phys_addr_t base, phys_addr_t size); +int memblock_clear_nomap(phys_addr_t base, phys_addr_t size); + +void memblock_free_all(void); +void memblock_free(void *ptr, size_t size); +void reset_all_zones_managed_pages(void); + +/* Low level functions */ +void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags, + struct memblock_type *type_a, + struct memblock_type *type_b, phys_addr_t *out_start, + phys_addr_t *out_end, int *out_nid); + +void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags, + struct memblock_type *type_a, + struct memblock_type *type_b, phys_addr_t *out_start, + phys_addr_t *out_end, int *out_nid); + +void memblock_free_late(phys_addr_t base, phys_addr_t size); + +#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP +static inline void __next_physmem_range(u64 *idx, struct memblock_type *type, + phys_addr_t *out_start, + phys_addr_t *out_end) +{ + extern struct memblock_type physmem; + + __next_mem_range(idx, NUMA_NO_NODE, MEMBLOCK_NONE, &physmem, type, + out_start, out_end, NULL); +} + +/** + * for_each_physmem_range - iterate through physmem areas not included in type. + * @i: u64 used as loop variable + * @type: ptr to memblock_type which excludes from the iteration, can be %NULL + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL + */ +#define for_each_physmem_range(i, type, p_start, p_end) \ + for (i = 0, __next_physmem_range(&i, type, p_start, p_end); \ + i != (u64)ULLONG_MAX; \ + __next_physmem_range(&i, type, p_start, p_end)) +#endif /* CONFIG_HAVE_MEMBLOCK_PHYS_MAP */ + +/** + * __for_each_mem_range - iterate through memblock areas from type_a and not + * included in type_b. Or just type_a if type_b is NULL. + * @i: u64 used as loop variable + * @type_a: ptr to memblock_type to iterate + * @type_b: ptr to memblock_type which excludes from the iteration + * @nid: node selector, %NUMA_NO_NODE for all nodes + * @flags: pick from blocks based on memory attributes + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL + * @p_nid: ptr to int for nid of the range, can be %NULL + */ +#define __for_each_mem_range(i, type_a, type_b, nid, flags, \ + p_start, p_end, p_nid) \ + for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \ + p_start, p_end, p_nid); \ + i != (u64)ULLONG_MAX; \ + __next_mem_range(&i, nid, flags, type_a, type_b, \ + p_start, p_end, p_nid)) + +/** + * __for_each_mem_range_rev - reverse iterate through memblock areas from + * type_a and not included in type_b. Or just type_a if type_b is NULL. + * @i: u64 used as loop variable + * @type_a: ptr to memblock_type to iterate + * @type_b: ptr to memblock_type which excludes from the iteration + * @nid: node selector, %NUMA_NO_NODE for all nodes + * @flags: pick from blocks based on memory attributes + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL + * @p_nid: ptr to int for nid of the range, can be %NULL + */ +#define __for_each_mem_range_rev(i, type_a, type_b, nid, flags, \ + p_start, p_end, p_nid) \ + for (i = (u64)ULLONG_MAX, \ + __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ + p_start, p_end, p_nid); \ + i != (u64)ULLONG_MAX; \ + __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ + p_start, p_end, p_nid)) + +/** + * for_each_mem_range - iterate through memory areas. + * @i: u64 used as loop variable + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL + */ +#define for_each_mem_range(i, p_start, p_end) \ + __for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE, \ + MEMBLOCK_HOTPLUG | MEMBLOCK_DRIVER_MANAGED, \ + p_start, p_end, NULL) + +/** + * for_each_mem_range_rev - reverse iterate through memblock areas from + * type_a and not included in type_b. Or just type_a if type_b is NULL. + * @i: u64 used as loop variable + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL + */ +#define for_each_mem_range_rev(i, p_start, p_end) \ + __for_each_mem_range_rev(i, &memblock.memory, NULL, NUMA_NO_NODE, \ + MEMBLOCK_HOTPLUG | MEMBLOCK_DRIVER_MANAGED,\ + p_start, p_end, NULL) + +/** + * for_each_reserved_mem_range - iterate over all reserved memblock areas + * @i: u64 used as loop variable + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL + * + * Walks over reserved areas of memblock. Available as soon as memblock + * is initialized. + */ +#define for_each_reserved_mem_range(i, p_start, p_end) \ + __for_each_mem_range(i, &memblock.reserved, NULL, NUMA_NO_NODE, \ + MEMBLOCK_NONE, p_start, p_end, NULL) + +static inline bool memblock_is_hotpluggable(struct memblock_region *m) +{ + return m->flags & MEMBLOCK_HOTPLUG; +} + +static inline bool memblock_is_mirror(struct memblock_region *m) +{ + return m->flags & MEMBLOCK_MIRROR; +} + +static inline bool memblock_is_nomap(struct memblock_region *m) +{ + return m->flags & MEMBLOCK_NOMAP; +} + +static inline bool memblock_is_driver_managed(struct memblock_region *m) +{ + return m->flags & MEMBLOCK_DRIVER_MANAGED; +} + +int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, + unsigned long *end_pfn); +void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, + unsigned long *out_end_pfn, int *out_nid); + +/** + * for_each_mem_pfn_range - early memory pfn range iterator + * @i: an integer used as loop variable + * @nid: node selector, %MAX_NUMNODES for all nodes + * @p_start: ptr to ulong for start pfn of the range, can be %NULL + * @p_end: ptr to ulong for end pfn of the range, can be %NULL + * @p_nid: ptr to int for nid of the range, can be %NULL + * + * Walks over configured memory ranges. + */ +#define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ + for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ + i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) + +#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT +void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone, + unsigned long *out_spfn, + unsigned long *out_epfn); +/** + * for_each_free_mem_pfn_range_in_zone - iterate through zone specific free + * memblock areas + * @i: u64 used as loop variable + * @zone: zone in which all of the memory blocks reside + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL + * + * Walks over free (memory && !reserved) areas of memblock in a specific + * zone. Available once memblock and an empty zone is initialized. The main + * assumption is that the zone start, end, and pgdat have been associated. + * This way we can use the zone to determine NUMA node, and if a given part + * of the memblock is valid for the zone. + */ +#define for_each_free_mem_pfn_range_in_zone(i, zone, p_start, p_end) \ + for (i = 0, \ + __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end); \ + i != U64_MAX; \ + __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end)) + +/** + * for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific + * free memblock areas from a given point + * @i: u64 used as loop variable + * @zone: zone in which all of the memory blocks reside + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL + * + * Walks over free (memory && !reserved) areas of memblock in a specific + * zone, continuing from current position. Available as soon as memblock is + * initialized. + */ +#define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \ + for (; i != U64_MAX; \ + __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end)) + +int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask); + +#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ + +/** + * for_each_free_mem_range - iterate through free memblock areas + * @i: u64 used as loop variable + * @nid: node selector, %NUMA_NO_NODE for all nodes + * @flags: pick from blocks based on memory attributes + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL + * @p_nid: ptr to int for nid of the range, can be %NULL + * + * Walks over free (memory && !reserved) areas of memblock. Available as + * soon as memblock is initialized. + */ +#define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ + __for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ + nid, flags, p_start, p_end, p_nid) + +/** + * for_each_free_mem_range_reverse - rev-iterate through free memblock areas + * @i: u64 used as loop variable + * @nid: node selector, %NUMA_NO_NODE for all nodes + * @flags: pick from blocks based on memory attributes + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL + * @p_nid: ptr to int for nid of the range, can be %NULL + * + * Walks over free (memory && !reserved) areas of memblock in reverse + * order. Available as soon as memblock is initialized. + */ +#define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ + p_nid) \ + __for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ + nid, flags, p_start, p_end, p_nid) + +int memblock_set_node(phys_addr_t base, phys_addr_t size, + struct memblock_type *type, int nid); + +#ifdef CONFIG_NUMA +static inline void memblock_set_region_node(struct memblock_region *r, int nid) +{ + r->nid = nid; +} + +static inline int memblock_get_region_node(const struct memblock_region *r) +{ + return r->nid; +} +#else +static inline void memblock_set_region_node(struct memblock_region *r, int nid) +{ +} + +static inline int memblock_get_region_node(const struct memblock_region *r) +{ + return 0; +} +#endif /* CONFIG_NUMA */ + +/* Flags for memblock allocation APIs */ +#define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) +#define MEMBLOCK_ALLOC_ACCESSIBLE 0 +#define MEMBLOCK_ALLOC_NOLEAKTRACE 1 + +/* We are using top down, so it is safe to use 0 here */ +#define MEMBLOCK_LOW_LIMIT 0 + +#ifndef ARCH_LOW_ADDRESS_LIMIT +#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL +#endif + +phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align, + phys_addr_t start, phys_addr_t end); +phys_addr_t memblock_alloc_range_nid(phys_addr_t size, + phys_addr_t align, phys_addr_t start, + phys_addr_t end, int nid, bool exact_nid); +phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); + +static __always_inline phys_addr_t memblock_phys_alloc(phys_addr_t size, + phys_addr_t align) +{ + return memblock_phys_alloc_range(size, align, 0, + MEMBLOCK_ALLOC_ACCESSIBLE); +} + +void *memblock_alloc_exact_nid_raw(phys_addr_t size, phys_addr_t align, + phys_addr_t min_addr, phys_addr_t max_addr, + int nid); +void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align, + phys_addr_t min_addr, phys_addr_t max_addr, + int nid); +void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, + phys_addr_t min_addr, phys_addr_t max_addr, + int nid); + +static __always_inline void *memblock_alloc(phys_addr_t size, phys_addr_t align) +{ + return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, + MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE); +} + +static inline void *memblock_alloc_raw(phys_addr_t size, + phys_addr_t align) +{ + return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT, + MEMBLOCK_ALLOC_ACCESSIBLE, + NUMA_NO_NODE); +} + +static inline void *memblock_alloc_from(phys_addr_t size, + phys_addr_t align, + phys_addr_t min_addr) +{ + return memblock_alloc_try_nid(size, align, min_addr, + MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE); +} + +static inline void *memblock_alloc_low(phys_addr_t size, + phys_addr_t align) +{ + return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, + ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE); +} + +static inline void *memblock_alloc_node(phys_addr_t size, + phys_addr_t align, int nid) +{ + return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, + MEMBLOCK_ALLOC_ACCESSIBLE, nid); +} + +/* + * Set the allocation direction to bottom-up or top-down. + */ +static inline __init_memblock void memblock_set_bottom_up(bool enable) +{ + memblock.bottom_up = enable; +} + +/* + * Check if the allocation direction is bottom-up or not. + * if this is true, that said, memblock will allocate memory + * in bottom-up direction. + */ +static inline __init_memblock bool memblock_bottom_up(void) +{ + return memblock.bottom_up; +} + +phys_addr_t memblock_phys_mem_size(void); +phys_addr_t memblock_reserved_size(void); +phys_addr_t memblock_start_of_DRAM(void); +phys_addr_t memblock_end_of_DRAM(void); +void memblock_enforce_memory_limit(phys_addr_t memory_limit); +void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size); +void memblock_mem_limit_remove_map(phys_addr_t limit); +bool memblock_is_memory(phys_addr_t addr); +bool memblock_is_map_memory(phys_addr_t addr); +bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size); +bool memblock_is_reserved(phys_addr_t addr); +bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); + +void memblock_dump_all(void); + +/** + * memblock_set_current_limit - Set the current allocation limit to allow + * limiting allocations to what is currently + * accessible during boot + * @limit: New limit value (physical address) + */ +void memblock_set_current_limit(phys_addr_t limit); + + +phys_addr_t memblock_get_current_limit(void); + +/* + * pfn conversion functions + * + * While the memory MEMBLOCKs should always be page aligned, the reserved + * MEMBLOCKs may not be. This accessor attempt to provide a very clear + * idea of what they return for such non aligned MEMBLOCKs. + */ + +/** + * memblock_region_memory_base_pfn - get the lowest pfn of the memory region + * @reg: memblock_region structure + * + * Return: the lowest pfn intersecting with the memory region + */ +static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) +{ + return PFN_UP(reg->base); +} + +/** + * memblock_region_memory_end_pfn - get the end pfn of the memory region + * @reg: memblock_region structure + * + * Return: the end_pfn of the reserved region + */ +static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) +{ + return PFN_DOWN(reg->base + reg->size); +} + +/** + * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region + * @reg: memblock_region structure + * + * Return: the lowest pfn intersecting with the reserved region + */ +static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) +{ + return PFN_DOWN(reg->base); +} + +/** + * memblock_region_reserved_end_pfn - get the end pfn of the reserved region + * @reg: memblock_region structure + * + * Return: the end_pfn of the reserved region + */ +static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) +{ + return PFN_UP(reg->base + reg->size); +} + +/** + * for_each_mem_region - itereate over memory regions + * @region: loop variable + */ +#define for_each_mem_region(region) \ + for (region = memblock.memory.regions; \ + region < (memblock.memory.regions + memblock.memory.cnt); \ + region++) + +/** + * for_each_reserved_mem_region - itereate over reserved memory regions + * @region: loop variable + */ +#define for_each_reserved_mem_region(region) \ + for (region = memblock.reserved.regions; \ + region < (memblock.reserved.regions + memblock.reserved.cnt); \ + region++) + +extern void *alloc_large_system_hash(const char *tablename, + unsigned long bucketsize, + unsigned long numentries, + int scale, + int flags, + unsigned int *_hash_shift, + unsigned int *_hash_mask, + unsigned long low_limit, + unsigned long high_limit); + +#define HASH_EARLY 0x00000001 /* Allocating during early boot? */ +#define HASH_ZERO 0x00000002 /* Zero allocated hash table */ + +/* Only NUMA needs hash distribution. 64bit NUMA architectures have + * sufficient vmalloc space. + */ +#ifdef CONFIG_NUMA +#define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT) +extern int hashdist; /* Distribute hashes across NUMA nodes? */ +#else +#define hashdist (0) +#endif + +#ifdef CONFIG_MEMTEST +void early_memtest(phys_addr_t start, phys_addr_t end); +void memtest_report_meminfo(struct seq_file *m); +#else +static inline void early_memtest(phys_addr_t start, phys_addr_t end) { } +static inline void memtest_report_meminfo(struct seq_file *m) { } +#endif + + +#endif /* _LINUX_MEMBLOCK_H */ |