195f72d1eSYinghai Lu /* 295f72d1eSYinghai Lu * Procedures for maintaining information about logical memory blocks. 395f72d1eSYinghai Lu * 495f72d1eSYinghai Lu * Peter Bergner, IBM Corp. June 2001. 595f72d1eSYinghai Lu * Copyright (C) 2001 Peter Bergner. 695f72d1eSYinghai Lu * 795f72d1eSYinghai Lu * This program is free software; you can redistribute it and/or 895f72d1eSYinghai Lu * modify it under the terms of the GNU General Public License 995f72d1eSYinghai Lu * as published by the Free Software Foundation; either version 1095f72d1eSYinghai Lu * 2 of the License, or (at your option) any later version. 1195f72d1eSYinghai Lu */ 1295f72d1eSYinghai Lu 1395f72d1eSYinghai Lu #include <linux/kernel.h> 14142b45a7SBenjamin Herrenschmidt #include <linux/slab.h> 1595f72d1eSYinghai Lu #include <linux/init.h> 1695f72d1eSYinghai Lu #include <linux/bitops.h> 17449e8df3SBenjamin Herrenschmidt #include <linux/poison.h> 18c196f76fSBenjamin Herrenschmidt #include <linux/pfn.h> 196d03b885SBenjamin Herrenschmidt #include <linux/debugfs.h> 206d03b885SBenjamin Herrenschmidt #include <linux/seq_file.h> 2195f72d1eSYinghai Lu #include <linux/memblock.h> 2295f72d1eSYinghai Lu 23fe091c20STejun Heo static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock; 24fe091c20STejun Heo static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock; 25fe091c20STejun Heo 26fe091c20STejun Heo struct memblock memblock __initdata_memblock = { 27fe091c20STejun Heo .memory.regions = memblock_memory_init_regions, 28fe091c20STejun Heo .memory.cnt = 1, /* empty dummy entry */ 29fe091c20STejun Heo .memory.max = INIT_MEMBLOCK_REGIONS, 30fe091c20STejun Heo 31fe091c20STejun Heo .reserved.regions = memblock_reserved_init_regions, 32fe091c20STejun Heo .reserved.cnt = 1, /* empty dummy entry */ 33fe091c20STejun Heo .reserved.max = INIT_MEMBLOCK_REGIONS, 34fe091c20STejun Heo 35fe091c20STejun Heo .current_limit = MEMBLOCK_ALLOC_ANYWHERE, 36fe091c20STejun Heo }; 3795f72d1eSYinghai Lu 3810d06439SYinghai Lu int memblock_debug __initdata_memblock; 3910d06439SYinghai Lu int memblock_can_resize __initdata_memblock; 4095f72d1eSYinghai Lu 41142b45a7SBenjamin Herrenschmidt /* inline so we don't get a warning when pr_debug is compiled out */ 42142b45a7SBenjamin Herrenschmidt static inline const char *memblock_type_name(struct memblock_type *type) 43142b45a7SBenjamin Herrenschmidt { 44142b45a7SBenjamin Herrenschmidt if (type == &memblock.memory) 45142b45a7SBenjamin Herrenschmidt return "memory"; 46142b45a7SBenjamin Herrenschmidt else if (type == &memblock.reserved) 47142b45a7SBenjamin Herrenschmidt return "reserved"; 48142b45a7SBenjamin Herrenschmidt else 49142b45a7SBenjamin Herrenschmidt return "unknown"; 50142b45a7SBenjamin Herrenschmidt } 51142b45a7SBenjamin Herrenschmidt 526ed311b2SBenjamin Herrenschmidt /* 536ed311b2SBenjamin Herrenschmidt * Address comparison utilities 546ed311b2SBenjamin Herrenschmidt */ 5510d06439SYinghai Lu static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1, 562898cc4cSBenjamin Herrenschmidt phys_addr_t base2, phys_addr_t size2) 5795f72d1eSYinghai Lu { 5895f72d1eSYinghai Lu return ((base1 < (base2 + size2)) && (base2 < (base1 + size1))); 5995f72d1eSYinghai Lu } 6095f72d1eSYinghai Lu 612d7d3eb2SH Hartley Sweeten static long __init_memblock memblock_overlaps_region(struct memblock_type *type, 622d7d3eb2SH Hartley Sweeten phys_addr_t base, phys_addr_t size) 636ed311b2SBenjamin Herrenschmidt { 646ed311b2SBenjamin Herrenschmidt unsigned long i; 656ed311b2SBenjamin Herrenschmidt 666ed311b2SBenjamin Herrenschmidt for (i = 0; i < type->cnt; i++) { 676ed311b2SBenjamin Herrenschmidt phys_addr_t rgnbase = type->regions[i].base; 686ed311b2SBenjamin Herrenschmidt phys_addr_t rgnsize = type->regions[i].size; 696ed311b2SBenjamin Herrenschmidt if (memblock_addrs_overlap(base, size, rgnbase, rgnsize)) 706ed311b2SBenjamin Herrenschmidt break; 716ed311b2SBenjamin Herrenschmidt } 726ed311b2SBenjamin Herrenschmidt 736ed311b2SBenjamin Herrenschmidt return (i < type->cnt) ? i : -1; 746ed311b2SBenjamin Herrenschmidt } 756ed311b2SBenjamin Herrenschmidt 766ed311b2SBenjamin Herrenschmidt /* 776ed311b2SBenjamin Herrenschmidt * Find, allocate, deallocate or reserve unreserved regions. All allocations 786ed311b2SBenjamin Herrenschmidt * are top-down. 796ed311b2SBenjamin Herrenschmidt */ 806ed311b2SBenjamin Herrenschmidt 81cd79481dSYinghai Lu static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_addr_t end, 826ed311b2SBenjamin Herrenschmidt phys_addr_t size, phys_addr_t align) 836ed311b2SBenjamin Herrenschmidt { 846ed311b2SBenjamin Herrenschmidt phys_addr_t base, res_base; 856ed311b2SBenjamin Herrenschmidt long j; 866ed311b2SBenjamin Herrenschmidt 87f1af98c7SYinghai Lu /* In case, huge size is requested */ 88f1af98c7SYinghai Lu if (end < size) 891f5026a7STejun Heo return 0; 90f1af98c7SYinghai Lu 91348968ebSTejun Heo base = round_down(end - size, align); 92f1af98c7SYinghai Lu 9325818f0fSBenjamin Herrenschmidt /* Prevent allocations returning 0 as it's also used to 9425818f0fSBenjamin Herrenschmidt * indicate an allocation failure 9525818f0fSBenjamin Herrenschmidt */ 9625818f0fSBenjamin Herrenschmidt if (start == 0) 9725818f0fSBenjamin Herrenschmidt start = PAGE_SIZE; 9825818f0fSBenjamin Herrenschmidt 996ed311b2SBenjamin Herrenschmidt while (start <= base) { 1006ed311b2SBenjamin Herrenschmidt j = memblock_overlaps_region(&memblock.reserved, base, size); 1016ed311b2SBenjamin Herrenschmidt if (j < 0) 1026ed311b2SBenjamin Herrenschmidt return base; 1036ed311b2SBenjamin Herrenschmidt res_base = memblock.reserved.regions[j].base; 1046ed311b2SBenjamin Herrenschmidt if (res_base < size) 1056ed311b2SBenjamin Herrenschmidt break; 106348968ebSTejun Heo base = round_down(res_base - size, align); 1076ed311b2SBenjamin Herrenschmidt } 1086ed311b2SBenjamin Herrenschmidt 1091f5026a7STejun Heo return 0; 1106ed311b2SBenjamin Herrenschmidt } 1116ed311b2SBenjamin Herrenschmidt 112fc769a8eSTejun Heo /* 113fc769a8eSTejun Heo * Find a free area with specified alignment in a specific range. 114fc769a8eSTejun Heo */ 115fc769a8eSTejun Heo phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start, phys_addr_t end, 116fc769a8eSTejun Heo phys_addr_t size, phys_addr_t align) 1176ed311b2SBenjamin Herrenschmidt { 1186ed311b2SBenjamin Herrenschmidt long i; 1196ed311b2SBenjamin Herrenschmidt 1206ed311b2SBenjamin Herrenschmidt BUG_ON(0 == size); 1216ed311b2SBenjamin Herrenschmidt 1226ed311b2SBenjamin Herrenschmidt /* Pump up max_addr */ 123fef501d4SBenjamin Herrenschmidt if (end == MEMBLOCK_ALLOC_ACCESSIBLE) 124fef501d4SBenjamin Herrenschmidt end = memblock.current_limit; 1256ed311b2SBenjamin Herrenschmidt 1266ed311b2SBenjamin Herrenschmidt /* We do a top-down search, this tends to limit memory 1276ed311b2SBenjamin Herrenschmidt * fragmentation by keeping early boot allocs near the 1286ed311b2SBenjamin Herrenschmidt * top of memory 1296ed311b2SBenjamin Herrenschmidt */ 1306ed311b2SBenjamin Herrenschmidt for (i = memblock.memory.cnt - 1; i >= 0; i--) { 1316ed311b2SBenjamin Herrenschmidt phys_addr_t memblockbase = memblock.memory.regions[i].base; 1326ed311b2SBenjamin Herrenschmidt phys_addr_t memblocksize = memblock.memory.regions[i].size; 133fef501d4SBenjamin Herrenschmidt phys_addr_t bottom, top, found; 1346ed311b2SBenjamin Herrenschmidt 1356ed311b2SBenjamin Herrenschmidt if (memblocksize < size) 1366ed311b2SBenjamin Herrenschmidt continue; 137fef501d4SBenjamin Herrenschmidt if ((memblockbase + memblocksize) <= start) 138fef501d4SBenjamin Herrenschmidt break; 139fef501d4SBenjamin Herrenschmidt bottom = max(memblockbase, start); 140fef501d4SBenjamin Herrenschmidt top = min(memblockbase + memblocksize, end); 141fef501d4SBenjamin Herrenschmidt if (bottom >= top) 142fef501d4SBenjamin Herrenschmidt continue; 143fef501d4SBenjamin Herrenschmidt found = memblock_find_region(bottom, top, size, align); 1441f5026a7STejun Heo if (found) 145fef501d4SBenjamin Herrenschmidt return found; 1466ed311b2SBenjamin Herrenschmidt } 1471f5026a7STejun Heo return 0; 1486ed311b2SBenjamin Herrenschmidt } 1496ed311b2SBenjamin Herrenschmidt 1505303b68fSYinghai Lu /* 1517950c407SYinghai Lu * Free memblock.reserved.regions 1527950c407SYinghai Lu */ 1537950c407SYinghai Lu int __init_memblock memblock_free_reserved_regions(void) 1547950c407SYinghai Lu { 1557950c407SYinghai Lu if (memblock.reserved.regions == memblock_reserved_init_regions) 1567950c407SYinghai Lu return 0; 1577950c407SYinghai Lu 1587950c407SYinghai Lu return memblock_free(__pa(memblock.reserved.regions), 1597950c407SYinghai Lu sizeof(struct memblock_region) * memblock.reserved.max); 1607950c407SYinghai Lu } 1617950c407SYinghai Lu 1627950c407SYinghai Lu /* 1637950c407SYinghai Lu * Reserve memblock.reserved.regions 1647950c407SYinghai Lu */ 1657950c407SYinghai Lu int __init_memblock memblock_reserve_reserved_regions(void) 1667950c407SYinghai Lu { 1677950c407SYinghai Lu if (memblock.reserved.regions == memblock_reserved_init_regions) 1687950c407SYinghai Lu return 0; 1697950c407SYinghai Lu 1707950c407SYinghai Lu return memblock_reserve(__pa(memblock.reserved.regions), 1717950c407SYinghai Lu sizeof(struct memblock_region) * memblock.reserved.max); 1727950c407SYinghai Lu } 1737950c407SYinghai Lu 17410d06439SYinghai Lu static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r) 17595f72d1eSYinghai Lu { 1767c0caeb8STejun Heo memmove(&type->regions[r], &type->regions[r + 1], 1777c0caeb8STejun Heo (type->cnt - (r + 1)) * sizeof(type->regions[r])); 178e3239ff9SBenjamin Herrenschmidt type->cnt--; 17995f72d1eSYinghai Lu 1808f7a6605SBenjamin Herrenschmidt /* Special case for empty arrays */ 1818f7a6605SBenjamin Herrenschmidt if (type->cnt == 0) { 1828f7a6605SBenjamin Herrenschmidt type->cnt = 1; 1838f7a6605SBenjamin Herrenschmidt type->regions[0].base = 0; 1848f7a6605SBenjamin Herrenschmidt type->regions[0].size = 0; 1857c0caeb8STejun Heo memblock_set_region_node(&type->regions[0], MAX_NUMNODES); 1868f7a6605SBenjamin Herrenschmidt } 18795f72d1eSYinghai Lu } 18895f72d1eSYinghai Lu 18910d06439SYinghai Lu static int __init_memblock memblock_double_array(struct memblock_type *type) 190142b45a7SBenjamin Herrenschmidt { 191142b45a7SBenjamin Herrenschmidt struct memblock_region *new_array, *old_array; 192142b45a7SBenjamin Herrenschmidt phys_addr_t old_size, new_size, addr; 193142b45a7SBenjamin Herrenschmidt int use_slab = slab_is_available(); 194142b45a7SBenjamin Herrenschmidt 195142b45a7SBenjamin Herrenschmidt /* We don't allow resizing until we know about the reserved regions 196142b45a7SBenjamin Herrenschmidt * of memory that aren't suitable for allocation 197142b45a7SBenjamin Herrenschmidt */ 198142b45a7SBenjamin Herrenschmidt if (!memblock_can_resize) 199142b45a7SBenjamin Herrenschmidt return -1; 200142b45a7SBenjamin Herrenschmidt 201142b45a7SBenjamin Herrenschmidt /* Calculate new doubled size */ 202142b45a7SBenjamin Herrenschmidt old_size = type->max * sizeof(struct memblock_region); 203142b45a7SBenjamin Herrenschmidt new_size = old_size << 1; 204142b45a7SBenjamin Herrenschmidt 205142b45a7SBenjamin Herrenschmidt /* Try to find some space for it. 206142b45a7SBenjamin Herrenschmidt * 207142b45a7SBenjamin Herrenschmidt * WARNING: We assume that either slab_is_available() and we use it or 208142b45a7SBenjamin Herrenschmidt * we use MEMBLOCK for allocations. That means that this is unsafe to use 209142b45a7SBenjamin Herrenschmidt * when bootmem is currently active (unless bootmem itself is implemented 210142b45a7SBenjamin Herrenschmidt * on top of MEMBLOCK which isn't the case yet) 211142b45a7SBenjamin Herrenschmidt * 212142b45a7SBenjamin Herrenschmidt * This should however not be an issue for now, as we currently only 213142b45a7SBenjamin Herrenschmidt * call into MEMBLOCK while it's still active, or much later when slab is 214142b45a7SBenjamin Herrenschmidt * active for memory hotplug operations 215142b45a7SBenjamin Herrenschmidt */ 216142b45a7SBenjamin Herrenschmidt if (use_slab) { 217142b45a7SBenjamin Herrenschmidt new_array = kmalloc(new_size, GFP_KERNEL); 2181f5026a7STejun Heo addr = new_array ? __pa(new_array) : 0; 219142b45a7SBenjamin Herrenschmidt } else 220fc769a8eSTejun Heo addr = memblock_find_in_range(0, MEMBLOCK_ALLOC_ACCESSIBLE, new_size, sizeof(phys_addr_t)); 2211f5026a7STejun Heo if (!addr) { 222142b45a7SBenjamin Herrenschmidt pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n", 223142b45a7SBenjamin Herrenschmidt memblock_type_name(type), type->max, type->max * 2); 224142b45a7SBenjamin Herrenschmidt return -1; 225142b45a7SBenjamin Herrenschmidt } 226142b45a7SBenjamin Herrenschmidt new_array = __va(addr); 227142b45a7SBenjamin Herrenschmidt 228ea9e4376SYinghai Lu memblock_dbg("memblock: %s array is doubled to %ld at [%#010llx-%#010llx]", 229ea9e4376SYinghai Lu memblock_type_name(type), type->max * 2, (u64)addr, (u64)addr + new_size - 1); 230ea9e4376SYinghai Lu 231142b45a7SBenjamin Herrenschmidt /* Found space, we now need to move the array over before 232142b45a7SBenjamin Herrenschmidt * we add the reserved region since it may be our reserved 233142b45a7SBenjamin Herrenschmidt * array itself that is full. 234142b45a7SBenjamin Herrenschmidt */ 235142b45a7SBenjamin Herrenschmidt memcpy(new_array, type->regions, old_size); 236142b45a7SBenjamin Herrenschmidt memset(new_array + type->max, 0, old_size); 237142b45a7SBenjamin Herrenschmidt old_array = type->regions; 238142b45a7SBenjamin Herrenschmidt type->regions = new_array; 239142b45a7SBenjamin Herrenschmidt type->max <<= 1; 240142b45a7SBenjamin Herrenschmidt 241142b45a7SBenjamin Herrenschmidt /* If we use SLAB that's it, we are done */ 242142b45a7SBenjamin Herrenschmidt if (use_slab) 243142b45a7SBenjamin Herrenschmidt return 0; 244142b45a7SBenjamin Herrenschmidt 245142b45a7SBenjamin Herrenschmidt /* Add the new reserved region now. Should not fail ! */ 2469c8c27e2STejun Heo BUG_ON(memblock_reserve(addr, new_size)); 247142b45a7SBenjamin Herrenschmidt 248142b45a7SBenjamin Herrenschmidt /* If the array wasn't our static init one, then free it. We only do 249142b45a7SBenjamin Herrenschmidt * that before SLAB is available as later on, we don't know whether 250142b45a7SBenjamin Herrenschmidt * to use kfree or free_bootmem_pages(). Shouldn't be a big deal 251142b45a7SBenjamin Herrenschmidt * anyways 252142b45a7SBenjamin Herrenschmidt */ 253142b45a7SBenjamin Herrenschmidt if (old_array != memblock_memory_init_regions && 254142b45a7SBenjamin Herrenschmidt old_array != memblock_reserved_init_regions) 255142b45a7SBenjamin Herrenschmidt memblock_free(__pa(old_array), old_size); 256142b45a7SBenjamin Herrenschmidt 257142b45a7SBenjamin Herrenschmidt return 0; 258142b45a7SBenjamin Herrenschmidt } 259142b45a7SBenjamin Herrenschmidt 260784656f9STejun Heo /** 261784656f9STejun Heo * memblock_merge_regions - merge neighboring compatible regions 262784656f9STejun Heo * @type: memblock type to scan 263784656f9STejun Heo * 264784656f9STejun Heo * Scan @type and merge neighboring compatible regions. 265784656f9STejun Heo */ 266784656f9STejun Heo static void __init_memblock memblock_merge_regions(struct memblock_type *type) 267784656f9STejun Heo { 268784656f9STejun Heo int i = 0; 269784656f9STejun Heo 270784656f9STejun Heo /* cnt never goes below 1 */ 271784656f9STejun Heo while (i < type->cnt - 1) { 272784656f9STejun Heo struct memblock_region *this = &type->regions[i]; 273784656f9STejun Heo struct memblock_region *next = &type->regions[i + 1]; 274784656f9STejun Heo 2757c0caeb8STejun Heo if (this->base + this->size != next->base || 2767c0caeb8STejun Heo memblock_get_region_node(this) != 2777c0caeb8STejun Heo memblock_get_region_node(next)) { 278784656f9STejun Heo BUG_ON(this->base + this->size > next->base); 279784656f9STejun Heo i++; 280784656f9STejun Heo continue; 281784656f9STejun Heo } 282784656f9STejun Heo 283784656f9STejun Heo this->size += next->size; 284784656f9STejun Heo memmove(next, next + 1, (type->cnt - (i + 1)) * sizeof(*next)); 285784656f9STejun Heo type->cnt--; 286784656f9STejun Heo } 287784656f9STejun Heo } 288784656f9STejun Heo 289784656f9STejun Heo /** 290784656f9STejun Heo * memblock_insert_region - insert new memblock region 291784656f9STejun Heo * @type: memblock type to insert into 292784656f9STejun Heo * @idx: index for the insertion point 293784656f9STejun Heo * @base: base address of the new region 294784656f9STejun Heo * @size: size of the new region 295784656f9STejun Heo * 296784656f9STejun Heo * Insert new memblock region [@base,@base+@size) into @type at @idx. 297784656f9STejun Heo * @type must already have extra room to accomodate the new region. 298784656f9STejun Heo */ 299784656f9STejun Heo static void __init_memblock memblock_insert_region(struct memblock_type *type, 300784656f9STejun Heo int idx, phys_addr_t base, 3017c0caeb8STejun Heo phys_addr_t size, int nid) 302784656f9STejun Heo { 303784656f9STejun Heo struct memblock_region *rgn = &type->regions[idx]; 304784656f9STejun Heo 305784656f9STejun Heo BUG_ON(type->cnt >= type->max); 306784656f9STejun Heo memmove(rgn + 1, rgn, (type->cnt - idx) * sizeof(*rgn)); 307784656f9STejun Heo rgn->base = base; 308784656f9STejun Heo rgn->size = size; 3097c0caeb8STejun Heo memblock_set_region_node(rgn, nid); 310784656f9STejun Heo type->cnt++; 311784656f9STejun Heo } 312784656f9STejun Heo 313784656f9STejun Heo /** 314784656f9STejun Heo * memblock_add_region - add new memblock region 315784656f9STejun Heo * @type: memblock type to add new region into 316784656f9STejun Heo * @base: base address of the new region 317784656f9STejun Heo * @size: size of the new region 318784656f9STejun Heo * 319784656f9STejun Heo * Add new memblock region [@base,@base+@size) into @type. The new region 320784656f9STejun Heo * is allowed to overlap with existing ones - overlaps don't affect already 321784656f9STejun Heo * existing regions. @type is guaranteed to be minimal (all neighbouring 322784656f9STejun Heo * compatible regions are merged) after the addition. 323784656f9STejun Heo * 324784656f9STejun Heo * RETURNS: 325784656f9STejun Heo * 0 on success, -errno on failure. 326784656f9STejun Heo */ 327581adcbeSTejun Heo static int __init_memblock memblock_add_region(struct memblock_type *type, 3288f7a6605SBenjamin Herrenschmidt phys_addr_t base, phys_addr_t size) 32995f72d1eSYinghai Lu { 330784656f9STejun Heo bool insert = false; 331784656f9STejun Heo phys_addr_t obase = base, end = base + size; 332784656f9STejun Heo int i, nr_new; 33395f72d1eSYinghai Lu 334784656f9STejun Heo /* special case for empty array */ 335784656f9STejun Heo if (type->regions[0].size == 0) { 336784656f9STejun Heo WARN_ON(type->cnt != 1); 337784656f9STejun Heo type->regions[0].base = base; 338784656f9STejun Heo type->regions[0].size = size; 3397c0caeb8STejun Heo memblock_set_region_node(&type->regions[0], MAX_NUMNODES); 340784656f9STejun Heo return 0; 341784656f9STejun Heo } 342784656f9STejun Heo repeat: 343784656f9STejun Heo /* 344784656f9STejun Heo * The following is executed twice. Once with %false @insert and 345784656f9STejun Heo * then with %true. The first counts the number of regions needed 346784656f9STejun Heo * to accomodate the new area. The second actually inserts them. 347784656f9STejun Heo */ 348784656f9STejun Heo base = obase; 349784656f9STejun Heo nr_new = 0; 350784656f9STejun Heo 3518f7a6605SBenjamin Herrenschmidt for (i = 0; i < type->cnt; i++) { 3528f7a6605SBenjamin Herrenschmidt struct memblock_region *rgn = &type->regions[i]; 353784656f9STejun Heo phys_addr_t rbase = rgn->base; 354784656f9STejun Heo phys_addr_t rend = rbase + rgn->size; 3558f7a6605SBenjamin Herrenschmidt 356784656f9STejun Heo if (rbase >= end) 3578f7a6605SBenjamin Herrenschmidt break; 358784656f9STejun Heo if (rend <= base) 359784656f9STejun Heo continue; 360784656f9STejun Heo /* 361784656f9STejun Heo * @rgn overlaps. If it separates the lower part of new 362784656f9STejun Heo * area, insert that portion. 3638f7a6605SBenjamin Herrenschmidt */ 364784656f9STejun Heo if (rbase > base) { 365784656f9STejun Heo nr_new++; 366784656f9STejun Heo if (insert) 367784656f9STejun Heo memblock_insert_region(type, i++, base, 3687c0caeb8STejun Heo rbase - base, MAX_NUMNODES); 369784656f9STejun Heo } 370784656f9STejun Heo /* area below @rend is dealt with, forget about it */ 371784656f9STejun Heo base = min(rend, end); 3728f7a6605SBenjamin Herrenschmidt } 3738f7a6605SBenjamin Herrenschmidt 374784656f9STejun Heo /* insert the remaining portion */ 375784656f9STejun Heo if (base < end) { 376784656f9STejun Heo nr_new++; 377784656f9STejun Heo if (insert) 3787c0caeb8STejun Heo memblock_insert_region(type, i, base, end - base, 3797c0caeb8STejun Heo MAX_NUMNODES); 3808f7a6605SBenjamin Herrenschmidt } 3818f7a6605SBenjamin Herrenschmidt 382784656f9STejun Heo /* 383784656f9STejun Heo * If this was the first round, resize array and repeat for actual 384784656f9STejun Heo * insertions; otherwise, merge and return. 3858f7a6605SBenjamin Herrenschmidt */ 386784656f9STejun Heo if (!insert) { 387784656f9STejun Heo while (type->cnt + nr_new > type->max) 388784656f9STejun Heo if (memblock_double_array(type) < 0) 389784656f9STejun Heo return -ENOMEM; 390784656f9STejun Heo insert = true; 391784656f9STejun Heo goto repeat; 39295f72d1eSYinghai Lu } else { 393784656f9STejun Heo memblock_merge_regions(type); 39495f72d1eSYinghai Lu return 0; 39595f72d1eSYinghai Lu } 396784656f9STejun Heo } 39795f72d1eSYinghai Lu 398581adcbeSTejun Heo int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size) 39995f72d1eSYinghai Lu { 400e3239ff9SBenjamin Herrenschmidt return memblock_add_region(&memblock.memory, base, size); 40195f72d1eSYinghai Lu } 40295f72d1eSYinghai Lu 403*6a9ceb31STejun Heo #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 404*6a9ceb31STejun Heo /** 405*6a9ceb31STejun Heo * memblock_isolate_range - isolate given range into disjoint memblocks 406*6a9ceb31STejun Heo * @type: memblock type to isolate range for 407*6a9ceb31STejun Heo * @base: base of range to isolate 408*6a9ceb31STejun Heo * @size: size of range to isolate 409*6a9ceb31STejun Heo * @start_rgn: out parameter for the start of isolated region 410*6a9ceb31STejun Heo * @end_rgn: out parameter for the end of isolated region 411*6a9ceb31STejun Heo * 412*6a9ceb31STejun Heo * Walk @type and ensure that regions don't cross the boundaries defined by 413*6a9ceb31STejun Heo * [@base,@base+@size). Crossing regions are split at the boundaries, 414*6a9ceb31STejun Heo * which may create at most two more regions. The index of the first 415*6a9ceb31STejun Heo * region inside the range is returned in *@start_rgn and end in *@end_rgn. 416*6a9ceb31STejun Heo * 417*6a9ceb31STejun Heo * RETURNS: 418*6a9ceb31STejun Heo * 0 on success, -errno on failure. 419*6a9ceb31STejun Heo */ 420*6a9ceb31STejun Heo static int __init_memblock memblock_isolate_range(struct memblock_type *type, 421*6a9ceb31STejun Heo phys_addr_t base, phys_addr_t size, 422*6a9ceb31STejun Heo int *start_rgn, int *end_rgn) 423*6a9ceb31STejun Heo { 424*6a9ceb31STejun Heo phys_addr_t end = base + size; 425*6a9ceb31STejun Heo int i; 426*6a9ceb31STejun Heo 427*6a9ceb31STejun Heo *start_rgn = *end_rgn = 0; 428*6a9ceb31STejun Heo 429*6a9ceb31STejun Heo /* we'll create at most two more regions */ 430*6a9ceb31STejun Heo while (type->cnt + 2 > type->max) 431*6a9ceb31STejun Heo if (memblock_double_array(type) < 0) 432*6a9ceb31STejun Heo return -ENOMEM; 433*6a9ceb31STejun Heo 434*6a9ceb31STejun Heo for (i = 0; i < type->cnt; i++) { 435*6a9ceb31STejun Heo struct memblock_region *rgn = &type->regions[i]; 436*6a9ceb31STejun Heo phys_addr_t rbase = rgn->base; 437*6a9ceb31STejun Heo phys_addr_t rend = rbase + rgn->size; 438*6a9ceb31STejun Heo 439*6a9ceb31STejun Heo if (rbase >= end) 440*6a9ceb31STejun Heo break; 441*6a9ceb31STejun Heo if (rend <= base) 442*6a9ceb31STejun Heo continue; 443*6a9ceb31STejun Heo 444*6a9ceb31STejun Heo if (rbase < base) { 445*6a9ceb31STejun Heo /* 446*6a9ceb31STejun Heo * @rgn intersects from below. Split and continue 447*6a9ceb31STejun Heo * to process the next region - the new top half. 448*6a9ceb31STejun Heo */ 449*6a9ceb31STejun Heo rgn->base = base; 450*6a9ceb31STejun Heo rgn->size = rend - rgn->base; 451*6a9ceb31STejun Heo memblock_insert_region(type, i, rbase, base - rbase, 452*6a9ceb31STejun Heo rgn->nid); 453*6a9ceb31STejun Heo } else if (rend > end) { 454*6a9ceb31STejun Heo /* 455*6a9ceb31STejun Heo * @rgn intersects from above. Split and redo the 456*6a9ceb31STejun Heo * current region - the new bottom half. 457*6a9ceb31STejun Heo */ 458*6a9ceb31STejun Heo rgn->base = end; 459*6a9ceb31STejun Heo rgn->size = rend - rgn->base; 460*6a9ceb31STejun Heo memblock_insert_region(type, i--, rbase, end - rbase, 461*6a9ceb31STejun Heo rgn->nid); 462*6a9ceb31STejun Heo } else { 463*6a9ceb31STejun Heo /* @rgn is fully contained, record it */ 464*6a9ceb31STejun Heo if (!*end_rgn) 465*6a9ceb31STejun Heo *start_rgn = i; 466*6a9ceb31STejun Heo *end_rgn = i + 1; 467*6a9ceb31STejun Heo } 468*6a9ceb31STejun Heo } 469*6a9ceb31STejun Heo 470*6a9ceb31STejun Heo return 0; 471*6a9ceb31STejun Heo } 472*6a9ceb31STejun Heo #endif 473*6a9ceb31STejun Heo 474581adcbeSTejun Heo static int __init_memblock __memblock_remove(struct memblock_type *type, 4758f7a6605SBenjamin Herrenschmidt phys_addr_t base, phys_addr_t size) 47695f72d1eSYinghai Lu { 4772898cc4cSBenjamin Herrenschmidt phys_addr_t end = base + size; 47895f72d1eSYinghai Lu int i; 47995f72d1eSYinghai Lu 4808f7a6605SBenjamin Herrenschmidt /* Walk through the array for collisions */ 481e3239ff9SBenjamin Herrenschmidt for (i = 0; i < type->cnt; i++) { 4828f7a6605SBenjamin Herrenschmidt struct memblock_region *rgn = &type->regions[i]; 4838f7a6605SBenjamin Herrenschmidt phys_addr_t rend = rgn->base + rgn->size; 48495f72d1eSYinghai Lu 4858f7a6605SBenjamin Herrenschmidt /* Nothing more to do, exit */ 4868f7a6605SBenjamin Herrenschmidt if (rgn->base > end || rgn->size == 0) 4878f7a6605SBenjamin Herrenschmidt break; 4888f7a6605SBenjamin Herrenschmidt 4898f7a6605SBenjamin Herrenschmidt /* If we fully enclose the block, drop it */ 4908f7a6605SBenjamin Herrenschmidt if (base <= rgn->base && end >= rend) { 4918f7a6605SBenjamin Herrenschmidt memblock_remove_region(type, i--); 4928f7a6605SBenjamin Herrenschmidt continue; 4938f7a6605SBenjamin Herrenschmidt } 4948f7a6605SBenjamin Herrenschmidt 4958f7a6605SBenjamin Herrenschmidt /* If we are fully enclosed within a block 4968f7a6605SBenjamin Herrenschmidt * then we need to split it and we are done 4978f7a6605SBenjamin Herrenschmidt */ 4988f7a6605SBenjamin Herrenschmidt if (base > rgn->base && end < rend) { 4998f7a6605SBenjamin Herrenschmidt rgn->size = base - rgn->base; 5008f7a6605SBenjamin Herrenschmidt if (!memblock_add_region(type, end, rend - end)) 5018f7a6605SBenjamin Herrenschmidt return 0; 5028f7a6605SBenjamin Herrenschmidt /* Failure to split is bad, we at least 5038f7a6605SBenjamin Herrenschmidt * restore the block before erroring 5048f7a6605SBenjamin Herrenschmidt */ 5058f7a6605SBenjamin Herrenschmidt rgn->size = rend - rgn->base; 5068f7a6605SBenjamin Herrenschmidt WARN_ON(1); 5078f7a6605SBenjamin Herrenschmidt return -1; 5088f7a6605SBenjamin Herrenschmidt } 5098f7a6605SBenjamin Herrenschmidt 5108f7a6605SBenjamin Herrenschmidt /* Check if we need to trim the bottom of a block */ 5118f7a6605SBenjamin Herrenschmidt if (rgn->base < end && rend > end) { 5128f7a6605SBenjamin Herrenschmidt rgn->size -= end - rgn->base; 5138f7a6605SBenjamin Herrenschmidt rgn->base = end; 51495f72d1eSYinghai Lu break; 51595f72d1eSYinghai Lu } 51695f72d1eSYinghai Lu 5178f7a6605SBenjamin Herrenschmidt /* And check if we need to trim the top of a block */ 5188f7a6605SBenjamin Herrenschmidt if (base < rend) 5198f7a6605SBenjamin Herrenschmidt rgn->size -= rend - base; 52095f72d1eSYinghai Lu 52195f72d1eSYinghai Lu } 52295f72d1eSYinghai Lu return 0; 52395f72d1eSYinghai Lu } 52495f72d1eSYinghai Lu 525581adcbeSTejun Heo int __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size) 52695f72d1eSYinghai Lu { 52795f72d1eSYinghai Lu return __memblock_remove(&memblock.memory, base, size); 52895f72d1eSYinghai Lu } 52995f72d1eSYinghai Lu 530581adcbeSTejun Heo int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size) 53195f72d1eSYinghai Lu { 53224aa0788STejun Heo memblock_dbg(" memblock_free: [%#016llx-%#016llx] %pF\n", 533a150439cSH. Peter Anvin (unsigned long long)base, 534a150439cSH. Peter Anvin (unsigned long long)base + size, 535a150439cSH. Peter Anvin (void *)_RET_IP_); 53624aa0788STejun Heo 53795f72d1eSYinghai Lu return __memblock_remove(&memblock.reserved, base, size); 53895f72d1eSYinghai Lu } 53995f72d1eSYinghai Lu 540581adcbeSTejun Heo int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size) 54195f72d1eSYinghai Lu { 542e3239ff9SBenjamin Herrenschmidt struct memblock_type *_rgn = &memblock.reserved; 54395f72d1eSYinghai Lu 54424aa0788STejun Heo memblock_dbg("memblock_reserve: [%#016llx-%#016llx] %pF\n", 545a150439cSH. Peter Anvin (unsigned long long)base, 546a150439cSH. Peter Anvin (unsigned long long)base + size, 547a150439cSH. Peter Anvin (void *)_RET_IP_); 54895f72d1eSYinghai Lu BUG_ON(0 == size); 54995f72d1eSYinghai Lu 55095f72d1eSYinghai Lu return memblock_add_region(_rgn, base, size); 55195f72d1eSYinghai Lu } 55295f72d1eSYinghai Lu 55335fd0808STejun Heo /** 55435fd0808STejun Heo * __next_free_mem_range - next function for for_each_free_mem_range() 55535fd0808STejun Heo * @idx: pointer to u64 loop variable 55635fd0808STejun Heo * @nid: nid: node selector, %MAX_NUMNODES for all nodes 55735fd0808STejun Heo * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 55835fd0808STejun Heo * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 55935fd0808STejun Heo * @p_nid: ptr to int for nid of the range, can be %NULL 56035fd0808STejun Heo * 56135fd0808STejun Heo * Find the first free area from *@idx which matches @nid, fill the out 56235fd0808STejun Heo * parameters, and update *@idx for the next iteration. The lower 32bit of 56335fd0808STejun Heo * *@idx contains index into memory region and the upper 32bit indexes the 56435fd0808STejun Heo * areas before each reserved region. For example, if reserved regions 56535fd0808STejun Heo * look like the following, 56635fd0808STejun Heo * 56735fd0808STejun Heo * 0:[0-16), 1:[32-48), 2:[128-130) 56835fd0808STejun Heo * 56935fd0808STejun Heo * The upper 32bit indexes the following regions. 57035fd0808STejun Heo * 57135fd0808STejun Heo * 0:[0-0), 1:[16-32), 2:[48-128), 3:[130-MAX) 57235fd0808STejun Heo * 57335fd0808STejun Heo * As both region arrays are sorted, the function advances the two indices 57435fd0808STejun Heo * in lockstep and returns each intersection. 57535fd0808STejun Heo */ 57635fd0808STejun Heo void __init_memblock __next_free_mem_range(u64 *idx, int nid, 57735fd0808STejun Heo phys_addr_t *out_start, 57835fd0808STejun Heo phys_addr_t *out_end, int *out_nid) 57935fd0808STejun Heo { 58035fd0808STejun Heo struct memblock_type *mem = &memblock.memory; 58135fd0808STejun Heo struct memblock_type *rsv = &memblock.reserved; 58235fd0808STejun Heo int mi = *idx & 0xffffffff; 58335fd0808STejun Heo int ri = *idx >> 32; 58435fd0808STejun Heo 58535fd0808STejun Heo for ( ; mi < mem->cnt; mi++) { 58635fd0808STejun Heo struct memblock_region *m = &mem->regions[mi]; 58735fd0808STejun Heo phys_addr_t m_start = m->base; 58835fd0808STejun Heo phys_addr_t m_end = m->base + m->size; 58935fd0808STejun Heo 59035fd0808STejun Heo /* only memory regions are associated with nodes, check it */ 59135fd0808STejun Heo if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m)) 59235fd0808STejun Heo continue; 59335fd0808STejun Heo 59435fd0808STejun Heo /* scan areas before each reservation for intersection */ 59535fd0808STejun Heo for ( ; ri < rsv->cnt + 1; ri++) { 59635fd0808STejun Heo struct memblock_region *r = &rsv->regions[ri]; 59735fd0808STejun Heo phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0; 59835fd0808STejun Heo phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX; 59935fd0808STejun Heo 60035fd0808STejun Heo /* if ri advanced past mi, break out to advance mi */ 60135fd0808STejun Heo if (r_start >= m_end) 60235fd0808STejun Heo break; 60335fd0808STejun Heo /* if the two regions intersect, we're done */ 60435fd0808STejun Heo if (m_start < r_end) { 60535fd0808STejun Heo if (out_start) 60635fd0808STejun Heo *out_start = max(m_start, r_start); 60735fd0808STejun Heo if (out_end) 60835fd0808STejun Heo *out_end = min(m_end, r_end); 60935fd0808STejun Heo if (out_nid) 61035fd0808STejun Heo *out_nid = memblock_get_region_node(m); 61135fd0808STejun Heo /* 61235fd0808STejun Heo * The region which ends first is advanced 61335fd0808STejun Heo * for the next iteration. 61435fd0808STejun Heo */ 61535fd0808STejun Heo if (m_end <= r_end) 61635fd0808STejun Heo mi++; 61735fd0808STejun Heo else 61835fd0808STejun Heo ri++; 61935fd0808STejun Heo *idx = (u32)mi | (u64)ri << 32; 62035fd0808STejun Heo return; 62135fd0808STejun Heo } 62235fd0808STejun Heo } 62335fd0808STejun Heo } 62435fd0808STejun Heo 62535fd0808STejun Heo /* signal end of iteration */ 62635fd0808STejun Heo *idx = ULLONG_MAX; 62735fd0808STejun Heo } 62835fd0808STejun Heo 6297c0caeb8STejun Heo #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 6307c0caeb8STejun Heo /* 6317c0caeb8STejun Heo * Common iterator interface used to define for_each_mem_range(). 6327c0caeb8STejun Heo */ 6337c0caeb8STejun Heo void __init_memblock __next_mem_pfn_range(int *idx, int nid, 6347c0caeb8STejun Heo unsigned long *out_start_pfn, 6357c0caeb8STejun Heo unsigned long *out_end_pfn, int *out_nid) 6367c0caeb8STejun Heo { 6377c0caeb8STejun Heo struct memblock_type *type = &memblock.memory; 6387c0caeb8STejun Heo struct memblock_region *r; 6397c0caeb8STejun Heo 6407c0caeb8STejun Heo while (++*idx < type->cnt) { 6417c0caeb8STejun Heo r = &type->regions[*idx]; 6427c0caeb8STejun Heo 6437c0caeb8STejun Heo if (PFN_UP(r->base) >= PFN_DOWN(r->base + r->size)) 6447c0caeb8STejun Heo continue; 6457c0caeb8STejun Heo if (nid == MAX_NUMNODES || nid == r->nid) 6467c0caeb8STejun Heo break; 6477c0caeb8STejun Heo } 6487c0caeb8STejun Heo if (*idx >= type->cnt) { 6497c0caeb8STejun Heo *idx = -1; 6507c0caeb8STejun Heo return; 6517c0caeb8STejun Heo } 6527c0caeb8STejun Heo 6537c0caeb8STejun Heo if (out_start_pfn) 6547c0caeb8STejun Heo *out_start_pfn = PFN_UP(r->base); 6557c0caeb8STejun Heo if (out_end_pfn) 6567c0caeb8STejun Heo *out_end_pfn = PFN_DOWN(r->base + r->size); 6577c0caeb8STejun Heo if (out_nid) 6587c0caeb8STejun Heo *out_nid = r->nid; 6597c0caeb8STejun Heo } 6607c0caeb8STejun Heo 6617c0caeb8STejun Heo /** 6627c0caeb8STejun Heo * memblock_set_node - set node ID on memblock regions 6637c0caeb8STejun Heo * @base: base of area to set node ID for 6647c0caeb8STejun Heo * @size: size of area to set node ID for 6657c0caeb8STejun Heo * @nid: node ID to set 6667c0caeb8STejun Heo * 6677c0caeb8STejun Heo * Set the nid of memblock memory regions in [@base,@base+@size) to @nid. 6687c0caeb8STejun Heo * Regions which cross the area boundaries are split as necessary. 6697c0caeb8STejun Heo * 6707c0caeb8STejun Heo * RETURNS: 6717c0caeb8STejun Heo * 0 on success, -errno on failure. 6727c0caeb8STejun Heo */ 6737c0caeb8STejun Heo int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size, 6747c0caeb8STejun Heo int nid) 6757c0caeb8STejun Heo { 6767c0caeb8STejun Heo struct memblock_type *type = &memblock.memory; 677*6a9ceb31STejun Heo int start_rgn, end_rgn; 678*6a9ceb31STejun Heo int i, ret; 6797c0caeb8STejun Heo 680*6a9ceb31STejun Heo ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn); 681*6a9ceb31STejun Heo if (ret) 682*6a9ceb31STejun Heo return ret; 6837c0caeb8STejun Heo 684*6a9ceb31STejun Heo for (i = start_rgn; i < end_rgn; i++) 685*6a9ceb31STejun Heo type->regions[i].nid = nid; 6867c0caeb8STejun Heo 6877c0caeb8STejun Heo memblock_merge_regions(type); 6887c0caeb8STejun Heo return 0; 6897c0caeb8STejun Heo } 6907c0caeb8STejun Heo #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 6917c0caeb8STejun Heo 6926ed311b2SBenjamin Herrenschmidt phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr) 69395f72d1eSYinghai Lu { 6946ed311b2SBenjamin Herrenschmidt phys_addr_t found; 69595f72d1eSYinghai Lu 6966ed311b2SBenjamin Herrenschmidt /* We align the size to limit fragmentation. Without this, a lot of 6976ed311b2SBenjamin Herrenschmidt * small allocs quickly eat up the whole reserve array on sparc 6986ed311b2SBenjamin Herrenschmidt */ 699348968ebSTejun Heo size = round_up(size, align); 7006ed311b2SBenjamin Herrenschmidt 701fc769a8eSTejun Heo found = memblock_find_in_range(0, max_addr, size, align); 7029c8c27e2STejun Heo if (found && !memblock_reserve(found, size)) 7036ed311b2SBenjamin Herrenschmidt return found; 7046ed311b2SBenjamin Herrenschmidt 7056ed311b2SBenjamin Herrenschmidt return 0; 70695f72d1eSYinghai Lu } 70795f72d1eSYinghai Lu 7086ed311b2SBenjamin Herrenschmidt phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr) 70995f72d1eSYinghai Lu { 7106ed311b2SBenjamin Herrenschmidt phys_addr_t alloc; 7116ed311b2SBenjamin Herrenschmidt 7126ed311b2SBenjamin Herrenschmidt alloc = __memblock_alloc_base(size, align, max_addr); 7136ed311b2SBenjamin Herrenschmidt 7146ed311b2SBenjamin Herrenschmidt if (alloc == 0) 7156ed311b2SBenjamin Herrenschmidt panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n", 7166ed311b2SBenjamin Herrenschmidt (unsigned long long) size, (unsigned long long) max_addr); 7176ed311b2SBenjamin Herrenschmidt 7186ed311b2SBenjamin Herrenschmidt return alloc; 71995f72d1eSYinghai Lu } 72095f72d1eSYinghai Lu 7216ed311b2SBenjamin Herrenschmidt phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align) 72295f72d1eSYinghai Lu { 7236ed311b2SBenjamin Herrenschmidt return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE); 72495f72d1eSYinghai Lu } 72595f72d1eSYinghai Lu 72695f72d1eSYinghai Lu 7276ed311b2SBenjamin Herrenschmidt /* 72834e18455STejun Heo * Additional node-local top-down allocators. 729c196f76fSBenjamin Herrenschmidt * 730c196f76fSBenjamin Herrenschmidt * WARNING: Only available after early_node_map[] has been populated, 731c196f76fSBenjamin Herrenschmidt * on some architectures, that is after all the calls to add_active_range() 732c196f76fSBenjamin Herrenschmidt * have been done to populate it. 7336ed311b2SBenjamin Herrenschmidt */ 73495f72d1eSYinghai Lu 73534e18455STejun Heo static phys_addr_t __init memblock_nid_range_rev(phys_addr_t start, 73634e18455STejun Heo phys_addr_t end, int *nid) 737c3f72b57SBenjamin Herrenschmidt { 738c196f76fSBenjamin Herrenschmidt #ifdef CONFIG_ARCH_POPULATES_NODE_MAP 739c196f76fSBenjamin Herrenschmidt unsigned long start_pfn, end_pfn; 740c196f76fSBenjamin Herrenschmidt int i; 741c196f76fSBenjamin Herrenschmidt 742b2fea988STejun Heo for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, nid) 74334e18455STejun Heo if (end > PFN_PHYS(start_pfn) && end <= PFN_PHYS(end_pfn)) 74434e18455STejun Heo return max(start, PFN_PHYS(start_pfn)); 745c196f76fSBenjamin Herrenschmidt #endif 746c3f72b57SBenjamin Herrenschmidt *nid = 0; 74734e18455STejun Heo return start; 748c3f72b57SBenjamin Herrenschmidt } 749c3f72b57SBenjamin Herrenschmidt 750e6498040STejun Heo phys_addr_t __init memblock_find_in_range_node(phys_addr_t start, 751e6498040STejun Heo phys_addr_t end, 7522898cc4cSBenjamin Herrenschmidt phys_addr_t size, 7532898cc4cSBenjamin Herrenschmidt phys_addr_t align, int nid) 75495f72d1eSYinghai Lu { 755e3239ff9SBenjamin Herrenschmidt struct memblock_type *mem = &memblock.memory; 75695f72d1eSYinghai Lu int i; 75795f72d1eSYinghai Lu 75895f72d1eSYinghai Lu BUG_ON(0 == size); 75995f72d1eSYinghai Lu 760e6498040STejun Heo /* Pump up max_addr */ 761e6498040STejun Heo if (end == MEMBLOCK_ALLOC_ACCESSIBLE) 762e6498040STejun Heo end = memblock.current_limit; 763e6498040STejun Heo 764e6498040STejun Heo for (i = mem->cnt - 1; i >= 0; i--) { 765e6498040STejun Heo struct memblock_region *r = &mem->regions[i]; 766e6498040STejun Heo phys_addr_t base = max(start, r->base); 767e6498040STejun Heo phys_addr_t top = min(end, r->base + r->size); 768e6498040STejun Heo 769e6498040STejun Heo while (base < top) { 770e6498040STejun Heo phys_addr_t tbase, ret; 771e6498040STejun Heo int tnid; 772e6498040STejun Heo 773e6498040STejun Heo tbase = memblock_nid_range_rev(base, top, &tnid); 774e6498040STejun Heo if (nid == MAX_NUMNODES || tnid == nid) { 775e6498040STejun Heo ret = memblock_find_region(tbase, top, size, align); 776e6498040STejun Heo if (ret) 777e6498040STejun Heo return ret; 778e6498040STejun Heo } 779e6498040STejun Heo top = tbase; 780e6498040STejun Heo } 781e6498040STejun Heo } 782e6498040STejun Heo 783e6498040STejun Heo return 0; 784e6498040STejun Heo } 785e6498040STejun Heo 786e6498040STejun Heo phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid) 787e6498040STejun Heo { 788e6498040STejun Heo phys_addr_t found; 789e6498040STejun Heo 790e6498040STejun Heo /* 791e6498040STejun Heo * We align the size to limit fragmentation. Without this, a lot of 7927f219c73SBenjamin Herrenschmidt * small allocs quickly eat up the whole reserve array on sparc 7937f219c73SBenjamin Herrenschmidt */ 794348968ebSTejun Heo size = round_up(size, align); 7957f219c73SBenjamin Herrenschmidt 796e6498040STejun Heo found = memblock_find_in_range_node(0, MEMBLOCK_ALLOC_ACCESSIBLE, 79795f72d1eSYinghai Lu size, align, nid); 7989c8c27e2STejun Heo if (found && !memblock_reserve(found, size)) 799e6498040STejun Heo return found; 80095f72d1eSYinghai Lu 8019d1e2492SBenjamin Herrenschmidt return 0; 8029d1e2492SBenjamin Herrenschmidt } 8039d1e2492SBenjamin Herrenschmidt 8049d1e2492SBenjamin Herrenschmidt phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid) 8059d1e2492SBenjamin Herrenschmidt { 8069d1e2492SBenjamin Herrenschmidt phys_addr_t res = memblock_alloc_nid(size, align, nid); 8079d1e2492SBenjamin Herrenschmidt 8089d1e2492SBenjamin Herrenschmidt if (res) 8099d1e2492SBenjamin Herrenschmidt return res; 81015fb0972STejun Heo return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE); 81195f72d1eSYinghai Lu } 81295f72d1eSYinghai Lu 8139d1e2492SBenjamin Herrenschmidt 8149d1e2492SBenjamin Herrenschmidt /* 8159d1e2492SBenjamin Herrenschmidt * Remaining API functions 8169d1e2492SBenjamin Herrenschmidt */ 8179d1e2492SBenjamin Herrenschmidt 81895f72d1eSYinghai Lu /* You must call memblock_analyze() before this. */ 8192898cc4cSBenjamin Herrenschmidt phys_addr_t __init memblock_phys_mem_size(void) 82095f72d1eSYinghai Lu { 8214734b594SBenjamin Herrenschmidt return memblock.memory_size; 82295f72d1eSYinghai Lu } 82395f72d1eSYinghai Lu 8240a93ebefSSam Ravnborg /* lowest address */ 8250a93ebefSSam Ravnborg phys_addr_t __init_memblock memblock_start_of_DRAM(void) 8260a93ebefSSam Ravnborg { 8270a93ebefSSam Ravnborg return memblock.memory.regions[0].base; 8280a93ebefSSam Ravnborg } 8290a93ebefSSam Ravnborg 83010d06439SYinghai Lu phys_addr_t __init_memblock memblock_end_of_DRAM(void) 83195f72d1eSYinghai Lu { 83295f72d1eSYinghai Lu int idx = memblock.memory.cnt - 1; 83395f72d1eSYinghai Lu 834e3239ff9SBenjamin Herrenschmidt return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size); 83595f72d1eSYinghai Lu } 83695f72d1eSYinghai Lu 83795f72d1eSYinghai Lu /* You must call memblock_analyze() after this. */ 8382898cc4cSBenjamin Herrenschmidt void __init memblock_enforce_memory_limit(phys_addr_t memory_limit) 83995f72d1eSYinghai Lu { 84095f72d1eSYinghai Lu unsigned long i; 8412898cc4cSBenjamin Herrenschmidt phys_addr_t limit; 842e3239ff9SBenjamin Herrenschmidt struct memblock_region *p; 84395f72d1eSYinghai Lu 84495f72d1eSYinghai Lu if (!memory_limit) 84595f72d1eSYinghai Lu return; 84695f72d1eSYinghai Lu 84795f72d1eSYinghai Lu /* Truncate the memblock regions to satisfy the memory limit. */ 84895f72d1eSYinghai Lu limit = memory_limit; 84995f72d1eSYinghai Lu for (i = 0; i < memblock.memory.cnt; i++) { 850e3239ff9SBenjamin Herrenschmidt if (limit > memblock.memory.regions[i].size) { 851e3239ff9SBenjamin Herrenschmidt limit -= memblock.memory.regions[i].size; 85295f72d1eSYinghai Lu continue; 85395f72d1eSYinghai Lu } 85495f72d1eSYinghai Lu 855e3239ff9SBenjamin Herrenschmidt memblock.memory.regions[i].size = limit; 85695f72d1eSYinghai Lu memblock.memory.cnt = i + 1; 85795f72d1eSYinghai Lu break; 85895f72d1eSYinghai Lu } 85995f72d1eSYinghai Lu 86095f72d1eSYinghai Lu memory_limit = memblock_end_of_DRAM(); 86195f72d1eSYinghai Lu 86295f72d1eSYinghai Lu /* And truncate any reserves above the limit also. */ 86395f72d1eSYinghai Lu for (i = 0; i < memblock.reserved.cnt; i++) { 864e3239ff9SBenjamin Herrenschmidt p = &memblock.reserved.regions[i]; 86595f72d1eSYinghai Lu 86695f72d1eSYinghai Lu if (p->base > memory_limit) 86795f72d1eSYinghai Lu p->size = 0; 86895f72d1eSYinghai Lu else if ((p->base + p->size) > memory_limit) 86995f72d1eSYinghai Lu p->size = memory_limit - p->base; 87095f72d1eSYinghai Lu 87195f72d1eSYinghai Lu if (p->size == 0) { 87295f72d1eSYinghai Lu memblock_remove_region(&memblock.reserved, i); 87395f72d1eSYinghai Lu i--; 87495f72d1eSYinghai Lu } 87595f72d1eSYinghai Lu } 87695f72d1eSYinghai Lu } 87795f72d1eSYinghai Lu 878cd79481dSYinghai Lu static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr) 87972d4b0b4SBenjamin Herrenschmidt { 88072d4b0b4SBenjamin Herrenschmidt unsigned int left = 0, right = type->cnt; 88172d4b0b4SBenjamin Herrenschmidt 88272d4b0b4SBenjamin Herrenschmidt do { 88372d4b0b4SBenjamin Herrenschmidt unsigned int mid = (right + left) / 2; 88472d4b0b4SBenjamin Herrenschmidt 88572d4b0b4SBenjamin Herrenschmidt if (addr < type->regions[mid].base) 88672d4b0b4SBenjamin Herrenschmidt right = mid; 88772d4b0b4SBenjamin Herrenschmidt else if (addr >= (type->regions[mid].base + 88872d4b0b4SBenjamin Herrenschmidt type->regions[mid].size)) 88972d4b0b4SBenjamin Herrenschmidt left = mid + 1; 89072d4b0b4SBenjamin Herrenschmidt else 89172d4b0b4SBenjamin Herrenschmidt return mid; 89272d4b0b4SBenjamin Herrenschmidt } while (left < right); 89372d4b0b4SBenjamin Herrenschmidt return -1; 89472d4b0b4SBenjamin Herrenschmidt } 89572d4b0b4SBenjamin Herrenschmidt 8962898cc4cSBenjamin Herrenschmidt int __init memblock_is_reserved(phys_addr_t addr) 89795f72d1eSYinghai Lu { 89872d4b0b4SBenjamin Herrenschmidt return memblock_search(&memblock.reserved, addr) != -1; 89995f72d1eSYinghai Lu } 90072d4b0b4SBenjamin Herrenschmidt 9013661ca66SYinghai Lu int __init_memblock memblock_is_memory(phys_addr_t addr) 90272d4b0b4SBenjamin Herrenschmidt { 90372d4b0b4SBenjamin Herrenschmidt return memblock_search(&memblock.memory, addr) != -1; 90472d4b0b4SBenjamin Herrenschmidt } 90572d4b0b4SBenjamin Herrenschmidt 9063661ca66SYinghai Lu int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size) 90772d4b0b4SBenjamin Herrenschmidt { 908abb65272STomi Valkeinen int idx = memblock_search(&memblock.memory, base); 90972d4b0b4SBenjamin Herrenschmidt 91072d4b0b4SBenjamin Herrenschmidt if (idx == -1) 91195f72d1eSYinghai Lu return 0; 912abb65272STomi Valkeinen return memblock.memory.regions[idx].base <= base && 913abb65272STomi Valkeinen (memblock.memory.regions[idx].base + 914abb65272STomi Valkeinen memblock.memory.regions[idx].size) >= (base + size); 91595f72d1eSYinghai Lu } 91695f72d1eSYinghai Lu 91710d06439SYinghai Lu int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size) 91895f72d1eSYinghai Lu { 919f1c2c19cSBenjamin Herrenschmidt return memblock_overlaps_region(&memblock.reserved, base, size) >= 0; 92095f72d1eSYinghai Lu } 92195f72d1eSYinghai Lu 922e63075a3SBenjamin Herrenschmidt 9233661ca66SYinghai Lu void __init_memblock memblock_set_current_limit(phys_addr_t limit) 924e63075a3SBenjamin Herrenschmidt { 925e63075a3SBenjamin Herrenschmidt memblock.current_limit = limit; 926e63075a3SBenjamin Herrenschmidt } 927e63075a3SBenjamin Herrenschmidt 9287c0caeb8STejun Heo static void __init_memblock memblock_dump(struct memblock_type *type, char *name) 9296ed311b2SBenjamin Herrenschmidt { 9306ed311b2SBenjamin Herrenschmidt unsigned long long base, size; 9316ed311b2SBenjamin Herrenschmidt int i; 9326ed311b2SBenjamin Herrenschmidt 9337c0caeb8STejun Heo pr_info(" %s.cnt = 0x%lx\n", name, type->cnt); 9346ed311b2SBenjamin Herrenschmidt 9357c0caeb8STejun Heo for (i = 0; i < type->cnt; i++) { 9367c0caeb8STejun Heo struct memblock_region *rgn = &type->regions[i]; 9377c0caeb8STejun Heo char nid_buf[32] = ""; 9386ed311b2SBenjamin Herrenschmidt 9397c0caeb8STejun Heo base = rgn->base; 9407c0caeb8STejun Heo size = rgn->size; 9417c0caeb8STejun Heo #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 9427c0caeb8STejun Heo if (memblock_get_region_node(rgn) != MAX_NUMNODES) 9437c0caeb8STejun Heo snprintf(nid_buf, sizeof(nid_buf), " on node %d", 9447c0caeb8STejun Heo memblock_get_region_node(rgn)); 9457c0caeb8STejun Heo #endif 9467c0caeb8STejun Heo pr_info(" %s[%#x]\t[%#016llx-%#016llx], %#llx bytes%s\n", 9477c0caeb8STejun Heo name, i, base, base + size - 1, size, nid_buf); 9486ed311b2SBenjamin Herrenschmidt } 9496ed311b2SBenjamin Herrenschmidt } 9506ed311b2SBenjamin Herrenschmidt 9514ff7b82fSTejun Heo void __init_memblock __memblock_dump_all(void) 9526ed311b2SBenjamin Herrenschmidt { 9536ed311b2SBenjamin Herrenschmidt pr_info("MEMBLOCK configuration:\n"); 9546ed311b2SBenjamin Herrenschmidt pr_info(" memory size = 0x%llx\n", (unsigned long long)memblock.memory_size); 9556ed311b2SBenjamin Herrenschmidt 9566ed311b2SBenjamin Herrenschmidt memblock_dump(&memblock.memory, "memory"); 9576ed311b2SBenjamin Herrenschmidt memblock_dump(&memblock.reserved, "reserved"); 9586ed311b2SBenjamin Herrenschmidt } 9596ed311b2SBenjamin Herrenschmidt 9606ed311b2SBenjamin Herrenschmidt void __init memblock_analyze(void) 9616ed311b2SBenjamin Herrenschmidt { 9626ed311b2SBenjamin Herrenschmidt int i; 9636ed311b2SBenjamin Herrenschmidt 9646ed311b2SBenjamin Herrenschmidt memblock.memory_size = 0; 9656ed311b2SBenjamin Herrenschmidt 9666ed311b2SBenjamin Herrenschmidt for (i = 0; i < memblock.memory.cnt; i++) 9676ed311b2SBenjamin Herrenschmidt memblock.memory_size += memblock.memory.regions[i].size; 968142b45a7SBenjamin Herrenschmidt 969142b45a7SBenjamin Herrenschmidt /* We allow resizing from there */ 970142b45a7SBenjamin Herrenschmidt memblock_can_resize = 1; 9716ed311b2SBenjamin Herrenschmidt } 9726ed311b2SBenjamin Herrenschmidt 9736ed311b2SBenjamin Herrenschmidt static int __init early_memblock(char *p) 9746ed311b2SBenjamin Herrenschmidt { 9756ed311b2SBenjamin Herrenschmidt if (p && strstr(p, "debug")) 9766ed311b2SBenjamin Herrenschmidt memblock_debug = 1; 9776ed311b2SBenjamin Herrenschmidt return 0; 9786ed311b2SBenjamin Herrenschmidt } 9796ed311b2SBenjamin Herrenschmidt early_param("memblock", early_memblock); 9806ed311b2SBenjamin Herrenschmidt 981c378ddd5STejun Heo #if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK) 9826d03b885SBenjamin Herrenschmidt 9836d03b885SBenjamin Herrenschmidt static int memblock_debug_show(struct seq_file *m, void *private) 9846d03b885SBenjamin Herrenschmidt { 9856d03b885SBenjamin Herrenschmidt struct memblock_type *type = m->private; 9866d03b885SBenjamin Herrenschmidt struct memblock_region *reg; 9876d03b885SBenjamin Herrenschmidt int i; 9886d03b885SBenjamin Herrenschmidt 9896d03b885SBenjamin Herrenschmidt for (i = 0; i < type->cnt; i++) { 9906d03b885SBenjamin Herrenschmidt reg = &type->regions[i]; 9916d03b885SBenjamin Herrenschmidt seq_printf(m, "%4d: ", i); 9926d03b885SBenjamin Herrenschmidt if (sizeof(phys_addr_t) == 4) 9936d03b885SBenjamin Herrenschmidt seq_printf(m, "0x%08lx..0x%08lx\n", 9946d03b885SBenjamin Herrenschmidt (unsigned long)reg->base, 9956d03b885SBenjamin Herrenschmidt (unsigned long)(reg->base + reg->size - 1)); 9966d03b885SBenjamin Herrenschmidt else 9976d03b885SBenjamin Herrenschmidt seq_printf(m, "0x%016llx..0x%016llx\n", 9986d03b885SBenjamin Herrenschmidt (unsigned long long)reg->base, 9996d03b885SBenjamin Herrenschmidt (unsigned long long)(reg->base + reg->size - 1)); 10006d03b885SBenjamin Herrenschmidt 10016d03b885SBenjamin Herrenschmidt } 10026d03b885SBenjamin Herrenschmidt return 0; 10036d03b885SBenjamin Herrenschmidt } 10046d03b885SBenjamin Herrenschmidt 10056d03b885SBenjamin Herrenschmidt static int memblock_debug_open(struct inode *inode, struct file *file) 10066d03b885SBenjamin Herrenschmidt { 10076d03b885SBenjamin Herrenschmidt return single_open(file, memblock_debug_show, inode->i_private); 10086d03b885SBenjamin Herrenschmidt } 10096d03b885SBenjamin Herrenschmidt 10106d03b885SBenjamin Herrenschmidt static const struct file_operations memblock_debug_fops = { 10116d03b885SBenjamin Herrenschmidt .open = memblock_debug_open, 10126d03b885SBenjamin Herrenschmidt .read = seq_read, 10136d03b885SBenjamin Herrenschmidt .llseek = seq_lseek, 10146d03b885SBenjamin Herrenschmidt .release = single_release, 10156d03b885SBenjamin Herrenschmidt }; 10166d03b885SBenjamin Herrenschmidt 10176d03b885SBenjamin Herrenschmidt static int __init memblock_init_debugfs(void) 10186d03b885SBenjamin Herrenschmidt { 10196d03b885SBenjamin Herrenschmidt struct dentry *root = debugfs_create_dir("memblock", NULL); 10206d03b885SBenjamin Herrenschmidt if (!root) 10216d03b885SBenjamin Herrenschmidt return -ENXIO; 10226d03b885SBenjamin Herrenschmidt debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops); 10236d03b885SBenjamin Herrenschmidt debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops); 10246d03b885SBenjamin Herrenschmidt 10256d03b885SBenjamin Herrenschmidt return 0; 10266d03b885SBenjamin Herrenschmidt } 10276d03b885SBenjamin Herrenschmidt __initcall(memblock_init_debugfs); 10286d03b885SBenjamin Herrenschmidt 10296d03b885SBenjamin Herrenschmidt #endif /* CONFIG_DEBUG_FS */ 1030