diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memblock.c | 273 |
1 files changed, 127 insertions, 146 deletions
diff --git a/mm/memblock.c b/mm/memblock.c index 1adbef09b43a..2f55f19b7c86 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -79,78 +79,66 @@ static long __init_memblock memblock_overlaps_region(struct memblock_type *type, return (i < type->cnt) ? i : -1; } -/* - * Find, allocate, deallocate or reserve unreserved regions. All allocations - * are top-down. +/** + * memblock_find_in_range_node - find free area in given range and node + * @start: start of candidate range + * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE} + * @size: size of free area to find + * @align: alignment of free area to find + * @nid: nid of the free area to find, %MAX_NUMNODES for any node + * + * Find @size free area aligned to @align in the specified range and node. + * + * RETURNS: + * Found address on success, %0 on failure. */ - -static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_addr_t end, - phys_addr_t size, phys_addr_t align) +phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start, + phys_addr_t end, phys_addr_t size, + phys_addr_t align, int nid) { - phys_addr_t base, res_base; - long j; + phys_addr_t this_start, this_end, cand; + u64 i; - /* In case, huge size is requested */ - if (end < size) - return 0; + /* align @size to avoid excessive fragmentation on reserved array */ + size = round_up(size, align); + + /* pump up @end */ + if (end == MEMBLOCK_ALLOC_ACCESSIBLE) + end = memblock.current_limit; - base = round_down(end - size, align); + /* adjust @start to avoid underflow and allocating the first page */ + start = max3(start, size, (phys_addr_t)PAGE_SIZE); + end = max(start, end); - /* Prevent allocations returning 0 as it's also used to - * indicate an allocation failure - */ - if (start == 0) - start = PAGE_SIZE; - - while (start <= base) { - j = memblock_overlaps_region(&memblock.reserved, base, size); - if (j < 0) - return base; - res_base = memblock.reserved.regions[j].base; - if (res_base < size) - break; - base = round_down(res_base - size, align); - } + for_each_free_mem_range_reverse(i, nid, &this_start, &this_end, NULL) { + this_start = clamp(this_start, start, end); + this_end = clamp(this_end, start, end); + cand = round_down(this_end - size, align); + if (cand >= this_start) + return cand; + } return 0; } -/* - * Find a free area with specified alignment in a specific range. +/** + * memblock_find_in_range - find free area in given range + * @start: start of candidate range + * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE} + * @size: size of free area to find + * @align: alignment of free area to find + * + * Find @size free area aligned to @align in the specified range. + * + * RETURNS: + * Found address on success, %0 on failure. */ -phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start, phys_addr_t end, - phys_addr_t size, phys_addr_t align) +phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start, + phys_addr_t end, phys_addr_t size, + phys_addr_t align) { - long i; - - BUG_ON(0 == size); - - /* Pump up max_addr */ - if (end == MEMBLOCK_ALLOC_ACCESSIBLE) - end = memblock.current_limit; - - /* We do a top-down search, this tends to limit memory - * fragmentation by keeping early boot allocs near the - * top of memory - */ - for (i = memblock.memory.cnt - 1; i >= 0; i--) { - phys_addr_t memblockbase = memblock.memory.regions[i].base; - phys_addr_t memblocksize = memblock.memory.regions[i].size; - phys_addr_t bottom, top, found; - - if (memblocksize < size) - continue; - if ((memblockbase + memblocksize) <= start) - break; - bottom = max(memblockbase, start); - top = min(memblockbase + memblocksize, end); - if (bottom >= top) - continue; - found = memblock_find_region(bottom, top, size, align); - if (found) - return found; - } - return 0; + return memblock_find_in_range_node(start, end, size, align, + MAX_NUMNODES); } /* @@ -607,6 +595,70 @@ void __init_memblock __next_free_mem_range(u64 *idx, int nid, *idx = ULLONG_MAX; } +/** + * __next_free_mem_range_rev - next function for for_each_free_mem_range_reverse() + * @idx: pointer to u64 loop variable + * @nid: nid: node selector, %MAX_NUMNODES for all nodes + * @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 + * + * Reverse of __next_free_mem_range(). + */ +void __init_memblock __next_free_mem_range_rev(u64 *idx, int nid, + phys_addr_t *out_start, + phys_addr_t *out_end, int *out_nid) +{ + struct memblock_type *mem = &memblock.memory; + struct memblock_type *rsv = &memblock.reserved; + int mi = *idx & 0xffffffff; + int ri = *idx >> 32; + + if (*idx == (u64)ULLONG_MAX) { + mi = mem->cnt - 1; + ri = rsv->cnt; + } + + for ( ; mi >= 0; mi--) { + struct memblock_region *m = &mem->regions[mi]; + phys_addr_t m_start = m->base; + phys_addr_t m_end = m->base + m->size; + + /* only memory regions are associated with nodes, check it */ + if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m)) + continue; + + /* scan areas before each reservation for intersection */ + for ( ; ri >= 0; ri--) { + struct memblock_region *r = &rsv->regions[ri]; + phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0; + phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX; + + /* if ri advanced past mi, break out to advance mi */ + if (r_end <= m_start) + break; + /* if the two regions intersect, we're done */ + if (m_end > r_start) { + if (out_start) + *out_start = max(m_start, r_start); + if (out_end) + *out_end = min(m_end, r_end); + if (out_nid) + *out_nid = memblock_get_region_node(m); + + if (m_start >= r_start) + mi--; + else + ri--; + *idx = (u32)mi | (u64)ri << 32; + return; + } + } + } + + *idx = ULLONG_MAX; +} + #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP /* * Common iterator interface used to define for_each_mem_range(). @@ -670,22 +722,29 @@ int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size, } #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ -phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr) +static phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size, + phys_addr_t align, phys_addr_t max_addr, + int nid) { phys_addr_t found; - /* We align the size to limit fragmentation. Without this, a lot of - * small allocs quickly eat up the whole reserve array on sparc - */ - size = round_up(size, align); - - found = memblock_find_in_range(0, max_addr, size, align); + found = memblock_find_in_range_node(0, max_addr, size, align, nid); if (found && !memblock_reserve(found, size)) return found; return 0; } +phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid) +{ + return memblock_alloc_base_nid(size, align, MEMBLOCK_ALLOC_ACCESSIBLE, nid); +} + +phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr) +{ + return memblock_alloc_base_nid(size, align, max_addr, MAX_NUMNODES); +} + phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr) { phys_addr_t alloc; @@ -704,84 +763,6 @@ phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align) return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE); } - -/* - * Additional node-local top-down allocators. - * - * WARNING: Only available after early_node_map[] has been populated, - * on some architectures, that is after all the calls to add_active_range() - * have been done to populate it. - */ - -static phys_addr_t __init memblock_nid_range_rev(phys_addr_t start, - phys_addr_t end, int *nid) -{ -#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP - unsigned long start_pfn, end_pfn; - int i; - - for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, nid) - if (end > PFN_PHYS(start_pfn) && end <= PFN_PHYS(end_pfn)) - return max(start, PFN_PHYS(start_pfn)); -#endif - *nid = 0; - return start; -} - -phys_addr_t __init memblock_find_in_range_node(phys_addr_t start, - phys_addr_t end, - phys_addr_t size, - phys_addr_t align, int nid) -{ - struct memblock_type *mem = &memblock.memory; - int i; - - BUG_ON(0 == size); - - /* Pump up max_addr */ - if (end == MEMBLOCK_ALLOC_ACCESSIBLE) - end = memblock.current_limit; - - for (i = mem->cnt - 1; i >= 0; i--) { - struct memblock_region *r = &mem->regions[i]; - phys_addr_t base = max(start, r->base); - phys_addr_t top = min(end, r->base + r->size); - - while (base < top) { - phys_addr_t tbase, ret; - int tnid; - - tbase = memblock_nid_range_rev(base, top, &tnid); - if (nid == MAX_NUMNODES || tnid == nid) { - ret = memblock_find_region(tbase, top, size, align); - if (ret) - return ret; - } - top = tbase; - } - } - - return 0; -} - -phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid) -{ - phys_addr_t found; - - /* - * We align the size to limit fragmentation. Without this, a lot of - * small allocs quickly eat up the whole reserve array on sparc - */ - size = round_up(size, align); - - found = memblock_find_in_range_node(0, MEMBLOCK_ALLOC_ACCESSIBLE, - size, align, nid); - if (found && !memblock_reserve(found, size)) - return found; - - return 0; -} - phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid) { phys_addr_t res = memblock_alloc_nid(size, align, nid); |