Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Based on arch/arm/mm/init.c |
| 3 | * |
| 4 | * Copyright (C) 1995-2005 Russell King |
| 5 | * Copyright (C) 2012 ARM Ltd. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/export.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/swap.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/bootmem.h> |
| 26 | #include <linux/mman.h> |
| 27 | #include <linux/nodemask.h> |
| 28 | #include <linux/initrd.h> |
| 29 | #include <linux/gfp.h> |
| 30 | #include <linux/memblock.h> |
| 31 | #include <linux/sort.h> |
| 32 | #include <linux/of_fdt.h> |
Catalin Marinas | 19e7640 | 2014-02-27 12:09:22 +0000 | [diff] [blame] | 33 | #include <linux/dma-mapping.h> |
Laura Abbott | 6ac2104 | 2013-12-12 19:28:33 +0000 | [diff] [blame] | 34 | #include <linux/dma-contiguous.h> |
Leif Lindholm | 86c8b27 | 2014-07-28 19:03:03 +0100 | [diff] [blame] | 35 | #include <linux/efi.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 36 | |
Catalin Marinas | 0837519 | 2014-07-16 17:42:43 +0100 | [diff] [blame] | 37 | #include <asm/fixmap.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 38 | #include <asm/sections.h> |
| 39 | #include <asm/setup.h> |
| 40 | #include <asm/sizes.h> |
| 41 | #include <asm/tlb.h> |
| 42 | |
| 43 | #include "mm.h" |
| 44 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 45 | phys_addr_t memstart_addr __read_mostly = 0; |
| 46 | |
Rob Herring | ec2eaa7 | 2013-08-25 16:47:48 -0500 | [diff] [blame] | 47 | #ifdef CONFIG_BLK_DEV_INITRD |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 48 | static int __init early_initrd(char *p) |
| 49 | { |
| 50 | unsigned long start, size; |
| 51 | char *endp; |
| 52 | |
| 53 | start = memparse(p, &endp); |
| 54 | if (*endp == ',') { |
| 55 | size = memparse(endp + 1, NULL); |
| 56 | |
Rob Herring | ec2eaa7 | 2013-08-25 16:47:48 -0500 | [diff] [blame] | 57 | initrd_start = (unsigned long)__va(start); |
| 58 | initrd_end = (unsigned long)__va(start + size); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 59 | } |
| 60 | return 0; |
| 61 | } |
| 62 | early_param("initrd", early_initrd); |
Rob Herring | ec2eaa7 | 2013-08-25 16:47:48 -0500 | [diff] [blame] | 63 | #endif |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 64 | |
Catalin Marinas | d50314a | 2014-07-18 11:54:37 +0100 | [diff] [blame] | 65 | /* |
| 66 | * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It |
| 67 | * currently assumes that for memory starting above 4G, 32-bit devices will |
| 68 | * use a DMA offset. |
| 69 | */ |
| 70 | static phys_addr_t max_zone_dma_phys(void) |
| 71 | { |
| 72 | phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32); |
| 73 | return min(offset + (1ULL << 32), memblock_end_of_DRAM()); |
| 74 | } |
| 75 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 76 | static void __init zone_sizes_init(unsigned long min, unsigned long max) |
| 77 | { |
| 78 | struct memblock_region *reg; |
| 79 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
Catalin Marinas | 19e7640 | 2014-02-27 12:09:22 +0000 | [diff] [blame] | 80 | unsigned long max_dma = min; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 81 | |
| 82 | memset(zone_size, 0, sizeof(zone_size)); |
| 83 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 84 | /* 4GB maximum for 32-bit only capable devices */ |
Catalin Marinas | 19e7640 | 2014-02-27 12:09:22 +0000 | [diff] [blame] | 85 | if (IS_ENABLED(CONFIG_ZONE_DMA)) { |
Catalin Marinas | d50314a | 2014-07-18 11:54:37 +0100 | [diff] [blame] | 86 | max_dma = PFN_DOWN(max_zone_dma_phys()); |
Catalin Marinas | 19e7640 | 2014-02-27 12:09:22 +0000 | [diff] [blame] | 87 | zone_size[ZONE_DMA] = max_dma - min; |
| 88 | } |
| 89 | zone_size[ZONE_NORMAL] = max - max_dma; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 90 | |
| 91 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
| 92 | |
| 93 | for_each_memblock(memory, reg) { |
| 94 | unsigned long start = memblock_region_memory_base_pfn(reg); |
| 95 | unsigned long end = memblock_region_memory_end_pfn(reg); |
| 96 | |
| 97 | if (start >= max) |
| 98 | continue; |
Catalin Marinas | 19e7640 | 2014-02-27 12:09:22 +0000 | [diff] [blame] | 99 | |
| 100 | if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) { |
| 101 | unsigned long dma_end = min(end, max_dma); |
| 102 | zhole_size[ZONE_DMA] -= dma_end - start; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 103 | } |
Catalin Marinas | 19e7640 | 2014-02-27 12:09:22 +0000 | [diff] [blame] | 104 | |
| 105 | if (end > max_dma) { |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 106 | unsigned long normal_end = min(end, max); |
Catalin Marinas | 19e7640 | 2014-02-27 12:09:22 +0000 | [diff] [blame] | 107 | unsigned long normal_start = max(start, max_dma); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 108 | zhole_size[ZONE_NORMAL] -= normal_end - normal_start; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | free_area_init_node(0, zone_size, min, zhole_size); |
| 113 | } |
| 114 | |
| 115 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
| 116 | int pfn_valid(unsigned long pfn) |
| 117 | { |
| 118 | return memblock_is_memory(pfn << PAGE_SHIFT); |
| 119 | } |
| 120 | EXPORT_SYMBOL(pfn_valid); |
| 121 | #endif |
| 122 | |
| 123 | #ifndef CONFIG_SPARSEMEM |
| 124 | static void arm64_memory_present(void) |
| 125 | { |
| 126 | } |
| 127 | #else |
| 128 | static void arm64_memory_present(void) |
| 129 | { |
| 130 | struct memblock_region *reg; |
| 131 | |
| 132 | for_each_memblock(memory, reg) |
| 133 | memory_present(0, memblock_region_memory_base_pfn(reg), |
| 134 | memblock_region_memory_end_pfn(reg)); |
| 135 | } |
| 136 | #endif |
| 137 | |
| 138 | void __init arm64_memblock_init(void) |
| 139 | { |
Catalin Marinas | 2d5a561 | 2014-06-13 13:41:20 +0100 | [diff] [blame] | 140 | phys_addr_t dma_phys_limit = 0; |
| 141 | |
Mark Rutland | bd00cd5 | 2014-06-24 16:51:35 +0100 | [diff] [blame] | 142 | /* |
| 143 | * Register the kernel text, kernel data, initrd, and initial |
| 144 | * pagetables with memblock. |
| 145 | */ |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 146 | memblock_reserve(__pa(_text), _end - _text); |
| 147 | #ifdef CONFIG_BLK_DEV_INITRD |
Rob Herring | ec2eaa7 | 2013-08-25 16:47:48 -0500 | [diff] [blame] | 148 | if (initrd_start) |
| 149 | memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 150 | #endif |
| 151 | |
Mark Salter | 0ceac9e | 2014-09-08 13:01:08 -0400 | [diff] [blame^] | 152 | early_init_fdt_scan_reserved_mem(); |
Catalin Marinas | 2d5a561 | 2014-06-13 13:41:20 +0100 | [diff] [blame] | 153 | |
| 154 | /* 4GB maximum for 32-bit only capable devices */ |
| 155 | if (IS_ENABLED(CONFIG_ZONE_DMA)) |
Catalin Marinas | d50314a | 2014-07-18 11:54:37 +0100 | [diff] [blame] | 156 | dma_phys_limit = max_zone_dma_phys(); |
Catalin Marinas | 2d5a561 | 2014-06-13 13:41:20 +0100 | [diff] [blame] | 157 | dma_contiguous_reserve(dma_phys_limit); |
Laura Abbott | 6ac2104 | 2013-12-12 19:28:33 +0000 | [diff] [blame] | 158 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 159 | memblock_allow_resize(); |
| 160 | memblock_dump_all(); |
| 161 | } |
| 162 | |
| 163 | void __init bootmem_init(void) |
| 164 | { |
| 165 | unsigned long min, max; |
| 166 | |
| 167 | min = PFN_UP(memblock_start_of_DRAM()); |
| 168 | max = PFN_DOWN(memblock_end_of_DRAM()); |
| 169 | |
| 170 | /* |
| 171 | * Sparsemem tries to allocate bootmem in memory_present(), so must be |
| 172 | * done after the fixed reservations. |
| 173 | */ |
| 174 | arm64_memory_present(); |
| 175 | |
| 176 | sparse_init(); |
| 177 | zone_sizes_init(min, max); |
| 178 | |
| 179 | high_memory = __va((max << PAGE_SHIFT) - 1) + 1; |
| 180 | max_pfn = max_low_pfn = max; |
| 181 | } |
| 182 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 183 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
| 184 | static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
| 185 | { |
| 186 | struct page *start_pg, *end_pg; |
| 187 | unsigned long pg, pgend; |
| 188 | |
| 189 | /* |
| 190 | * Convert start_pfn/end_pfn to a struct page pointer. |
| 191 | */ |
| 192 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
| 193 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
| 194 | |
| 195 | /* |
| 196 | * Convert to physical addresses, and round start upwards and end |
| 197 | * downwards. |
| 198 | */ |
| 199 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); |
| 200 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; |
| 201 | |
| 202 | /* |
| 203 | * If there are free pages between these, free the section of the |
| 204 | * memmap array. |
| 205 | */ |
| 206 | if (pg < pgend) |
| 207 | free_bootmem(pg, pgend - pg); |
| 208 | } |
| 209 | |
| 210 | /* |
| 211 | * The mem_map array can get very big. Free the unused area of the memory map. |
| 212 | */ |
| 213 | static void __init free_unused_memmap(void) |
| 214 | { |
| 215 | unsigned long start, prev_end = 0; |
| 216 | struct memblock_region *reg; |
| 217 | |
| 218 | for_each_memblock(memory, reg) { |
| 219 | start = __phys_to_pfn(reg->base); |
| 220 | |
| 221 | #ifdef CONFIG_SPARSEMEM |
| 222 | /* |
| 223 | * Take care not to free memmap entries that don't exist due |
| 224 | * to SPARSEMEM sections which aren't present. |
| 225 | */ |
| 226 | start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); |
| 227 | #endif |
| 228 | /* |
| 229 | * If we had a previous bank, and there is a space between the |
| 230 | * current bank and the previous, free it. |
| 231 | */ |
| 232 | if (prev_end && prev_end < start) |
| 233 | free_memmap(prev_end, start); |
| 234 | |
| 235 | /* |
| 236 | * Align up here since the VM subsystem insists that the |
| 237 | * memmap entries are valid from the bank end aligned to |
| 238 | * MAX_ORDER_NR_PAGES. |
| 239 | */ |
| 240 | prev_end = ALIGN(start + __phys_to_pfn(reg->size), |
| 241 | MAX_ORDER_NR_PAGES); |
| 242 | } |
| 243 | |
| 244 | #ifdef CONFIG_SPARSEMEM |
| 245 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) |
| 246 | free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); |
| 247 | #endif |
| 248 | } |
| 249 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ |
| 250 | |
| 251 | /* |
| 252 | * mem_init() marks the free areas in the mem_map and tells us how much memory |
| 253 | * is free. This is done after various parts of the system have claimed their |
| 254 | * memory after the kernel image. |
| 255 | */ |
| 256 | void __init mem_init(void) |
| 257 | { |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 258 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
| 259 | |
| 260 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 261 | free_unused_memmap(); |
| 262 | #endif |
Jiang Liu | bee4ebd | 2013-07-03 15:03:49 -0700 | [diff] [blame] | 263 | /* this will put all unused low memory onto the freelists */ |
Jiang Liu | 0c98853 | 2013-07-03 15:03:24 -0700 | [diff] [blame] | 264 | free_all_bootmem(); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 265 | |
Jiang Liu | 6879ea8 | 2013-07-03 15:04:02 -0700 | [diff] [blame] | 266 | mem_init_print_info(NULL); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 267 | |
| 268 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
| 269 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 |
Catalin Marinas | 0837519 | 2014-07-16 17:42:43 +0100 | [diff] [blame] | 270 | #define MLG(b, t) b, t, ((t) - (b)) >> 30 |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 271 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
| 272 | |
| 273 | pr_notice("Virtual kernel memory layout:\n" |
Catalin Marinas | 0837519 | 2014-07-16 17:42:43 +0100 | [diff] [blame] | 274 | " vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n" |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 275 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
Catalin Marinas | 0837519 | 2014-07-16 17:42:43 +0100 | [diff] [blame] | 276 | " vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n" |
| 277 | " 0x%16lx - 0x%16lx (%6ld MB actual)\n" |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 278 | #endif |
Catalin Marinas | 0837519 | 2014-07-16 17:42:43 +0100 | [diff] [blame] | 279 | " PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n" |
| 280 | " fixed : 0x%16lx - 0x%16lx (%6ld KB)\n" |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 281 | " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" |
| 282 | " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" |
Catalin Marinas | 0837519 | 2014-07-16 17:42:43 +0100 | [diff] [blame] | 283 | " .init : 0x%p" " - 0x%p" " (%6ld KB)\n" |
| 284 | " .text : 0x%p" " - 0x%p" " (%6ld KB)\n" |
| 285 | " .data : 0x%p" " - 0x%p" " (%6ld KB)\n", |
| 286 | MLG(VMALLOC_START, VMALLOC_END), |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 287 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
Catalin Marinas | 0837519 | 2014-07-16 17:42:43 +0100 | [diff] [blame] | 288 | MLG((unsigned long)vmemmap, |
| 289 | (unsigned long)vmemmap + VMEMMAP_SIZE), |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 290 | MLM((unsigned long)virt_to_page(PAGE_OFFSET), |
| 291 | (unsigned long)virt_to_page(high_memory)), |
| 292 | #endif |
Catalin Marinas | 0837519 | 2014-07-16 17:42:43 +0100 | [diff] [blame] | 293 | MLM((unsigned long)PCI_IOBASE, (unsigned long)PCI_IOBASE + SZ_16M), |
| 294 | MLK(FIXADDR_START, FIXADDR_TOP), |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 295 | MLM(MODULES_VADDR, MODULES_END), |
| 296 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 297 | MLK_ROUNDUP(__init_begin, __init_end), |
| 298 | MLK_ROUNDUP(_text, _etext), |
| 299 | MLK_ROUNDUP(_sdata, _edata)); |
| 300 | |
| 301 | #undef MLK |
| 302 | #undef MLM |
| 303 | #undef MLK_ROUNDUP |
| 304 | |
| 305 | /* |
| 306 | * Check boundaries twice: Some fundamental inconsistencies can be |
| 307 | * detected at build time already. |
| 308 | */ |
| 309 | #ifdef CONFIG_COMPAT |
| 310 | BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); |
| 311 | #endif |
| 312 | BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); |
| 313 | BUG_ON(TASK_SIZE_64 > MODULES_VADDR); |
| 314 | |
Jiang Liu | bee4ebd | 2013-07-03 15:03:49 -0700 | [diff] [blame] | 315 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 316 | extern int sysctl_overcommit_memory; |
| 317 | /* |
| 318 | * On a machine this small we won't get anywhere without |
| 319 | * overcommit, so turn it on by default. |
| 320 | */ |
| 321 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | void free_initmem(void) |
| 326 | { |
Jiang Liu | 9af5b80 | 2013-07-03 15:02:54 -0700 | [diff] [blame] | 327 | free_initmem_default(0); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | #ifdef CONFIG_BLK_DEV_INITRD |
| 331 | |
| 332 | static int keep_initrd; |
| 333 | |
| 334 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 335 | { |
Jiang Liu | 9af5b80 | 2013-07-03 15:02:54 -0700 | [diff] [blame] | 336 | if (!keep_initrd) |
| 337 | free_reserved_area((void *)start, (void *)end, 0, "initrd"); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | static int __init keepinitrd_setup(char *__unused) |
| 341 | { |
| 342 | keep_initrd = 1; |
| 343 | return 1; |
| 344 | } |
| 345 | |
| 346 | __setup("keepinitrd", keepinitrd_setup); |
| 347 | #endif |