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 | f44acdf | 2014-05-09 15:58:17 +0100 | [diff] [blame] | 33 | #include <linux/dma-mapping.h> |
Laura Abbott | 97e4a88 | 2013-12-12 19:28:33 +0000 | [diff] [blame] | 34 | #include <linux/dma-contiguous.h> |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 35 | |
| 36 | #include <asm/prom.h> |
| 37 | #include <asm/sections.h> |
| 38 | #include <asm/setup.h> |
| 39 | #include <asm/sizes.h> |
| 40 | #include <asm/tlb.h> |
| 41 | |
| 42 | #include "mm.h" |
| 43 | |
| 44 | static unsigned long phys_initrd_start __initdata = 0; |
| 45 | static unsigned long phys_initrd_size __initdata = 0; |
| 46 | |
| 47 | phys_addr_t memstart_addr __read_mostly = 0; |
| 48 | |
Santosh Shilimkar | 9a87b8d | 2013-07-01 14:20:35 -0400 | [diff] [blame] | 49 | void __init early_init_dt_setup_initrd_arch(u64 start, u64 end) |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 50 | { |
| 51 | phys_initrd_start = start; |
| 52 | phys_initrd_size = end - start; |
| 53 | } |
| 54 | |
| 55 | static int __init early_initrd(char *p) |
| 56 | { |
| 57 | unsigned long start, size; |
| 58 | char *endp; |
| 59 | |
| 60 | start = memparse(p, &endp); |
| 61 | if (*endp == ',') { |
| 62 | size = memparse(endp + 1, NULL); |
| 63 | |
| 64 | phys_initrd_start = start; |
| 65 | phys_initrd_size = size; |
| 66 | } |
| 67 | return 0; |
| 68 | } |
| 69 | early_param("initrd", early_initrd); |
| 70 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 71 | static void __init zone_sizes_init(unsigned long min, unsigned long max) |
| 72 | { |
| 73 | struct memblock_region *reg; |
| 74 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
Catalin Marinas | f44acdf | 2014-05-09 15:58:17 +0100 | [diff] [blame] | 75 | unsigned long max_dma = min; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 76 | |
| 77 | memset(zone_size, 0, sizeof(zone_size)); |
| 78 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 79 | /* 4GB maximum for 32-bit only capable devices */ |
Catalin Marinas | f44acdf | 2014-05-09 15:58:17 +0100 | [diff] [blame] | 80 | if (IS_ENABLED(CONFIG_ZONE_DMA)) { |
| 81 | unsigned long max_dma_phys = |
| 82 | (unsigned long)dma_to_phys(NULL, DMA_BIT_MASK(32) + 1); |
| 83 | max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT)); |
| 84 | zone_size[ZONE_DMA] = max_dma - min; |
| 85 | } |
| 86 | zone_size[ZONE_NORMAL] = max - max_dma; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 87 | |
| 88 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
| 89 | |
| 90 | for_each_memblock(memory, reg) { |
| 91 | unsigned long start = memblock_region_memory_base_pfn(reg); |
| 92 | unsigned long end = memblock_region_memory_end_pfn(reg); |
| 93 | |
| 94 | if (start >= max) |
| 95 | continue; |
Catalin Marinas | f44acdf | 2014-05-09 15:58:17 +0100 | [diff] [blame] | 96 | |
| 97 | if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) { |
| 98 | unsigned long dma_end = min(end, max_dma); |
| 99 | zhole_size[ZONE_DMA] -= dma_end - start; |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 100 | } |
Catalin Marinas | f44acdf | 2014-05-09 15:58:17 +0100 | [diff] [blame] | 101 | |
| 102 | if (end > max_dma) { |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 103 | unsigned long normal_end = min(end, max); |
Catalin Marinas | f44acdf | 2014-05-09 15:58:17 +0100 | [diff] [blame] | 104 | unsigned long normal_start = max(start, max_dma); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 105 | zhole_size[ZONE_NORMAL] -= normal_end - normal_start; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | free_area_init_node(0, zone_size, min, zhole_size); |
| 110 | } |
| 111 | |
| 112 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
| 113 | int pfn_valid(unsigned long pfn) |
| 114 | { |
| 115 | return memblock_is_memory(pfn << PAGE_SHIFT); |
| 116 | } |
| 117 | EXPORT_SYMBOL(pfn_valid); |
| 118 | #endif |
| 119 | |
| 120 | #ifndef CONFIG_SPARSEMEM |
| 121 | static void arm64_memory_present(void) |
| 122 | { |
| 123 | } |
| 124 | #else |
| 125 | static void arm64_memory_present(void) |
| 126 | { |
| 127 | struct memblock_region *reg; |
| 128 | |
| 129 | for_each_memblock(memory, reg) |
| 130 | memory_present(0, memblock_region_memory_base_pfn(reg), |
| 131 | memblock_region_memory_end_pfn(reg)); |
| 132 | } |
| 133 | #endif |
| 134 | |
| 135 | void __init arm64_memblock_init(void) |
| 136 | { |
| 137 | u64 *reserve_map, base, size; |
| 138 | |
Mark Rutland | 0c0ec28 | 2014-06-24 16:51:35 +0100 | [diff] [blame^] | 139 | /* |
| 140 | * Register the kernel text, kernel data, initrd, and initial |
| 141 | * pagetables with memblock. |
| 142 | */ |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 143 | memblock_reserve(__pa(_text), _end - _text); |
| 144 | #ifdef CONFIG_BLK_DEV_INITRD |
| 145 | if (phys_initrd_size) { |
| 146 | memblock_reserve(phys_initrd_start, phys_initrd_size); |
| 147 | |
| 148 | /* Now convert initrd to virtual addresses */ |
| 149 | initrd_start = __phys_to_virt(phys_initrd_start); |
| 150 | initrd_end = initrd_start + phys_initrd_size; |
| 151 | } |
| 152 | #endif |
| 153 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 154 | /* Reserve the dtb region */ |
| 155 | memblock_reserve(virt_to_phys(initial_boot_params), |
| 156 | be32_to_cpu(initial_boot_params->totalsize)); |
| 157 | |
| 158 | /* |
| 159 | * Process the reserve map. This will probably overlap the initrd |
| 160 | * and dtb locations which are already reserved, but overlapping |
| 161 | * doesn't hurt anything |
| 162 | */ |
| 163 | reserve_map = ((void*)initial_boot_params) + |
| 164 | be32_to_cpu(initial_boot_params->off_mem_rsvmap); |
| 165 | while (1) { |
| 166 | base = be64_to_cpup(reserve_map++); |
| 167 | size = be64_to_cpup(reserve_map++); |
| 168 | if (!size) |
| 169 | break; |
| 170 | memblock_reserve(base, size); |
| 171 | } |
| 172 | |
Laura Abbott | 97e4a88 | 2013-12-12 19:28:33 +0000 | [diff] [blame] | 173 | dma_contiguous_reserve(0); |
| 174 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 175 | memblock_allow_resize(); |
| 176 | memblock_dump_all(); |
| 177 | } |
| 178 | |
| 179 | void __init bootmem_init(void) |
| 180 | { |
| 181 | unsigned long min, max; |
| 182 | |
| 183 | min = PFN_UP(memblock_start_of_DRAM()); |
| 184 | max = PFN_DOWN(memblock_end_of_DRAM()); |
| 185 | |
| 186 | /* |
| 187 | * Sparsemem tries to allocate bootmem in memory_present(), so must be |
| 188 | * done after the fixed reservations. |
| 189 | */ |
| 190 | arm64_memory_present(); |
| 191 | |
| 192 | sparse_init(); |
| 193 | zone_sizes_init(min, max); |
| 194 | |
| 195 | high_memory = __va((max << PAGE_SHIFT) - 1) + 1; |
| 196 | max_pfn = max_low_pfn = max; |
| 197 | } |
| 198 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 199 | /* |
| 200 | * Poison init memory with an undefined instruction (0x0). |
| 201 | */ |
| 202 | static inline void poison_init_mem(void *s, size_t count) |
| 203 | { |
| 204 | memset(s, 0, count); |
| 205 | } |
| 206 | |
| 207 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
| 208 | static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
| 209 | { |
| 210 | struct page *start_pg, *end_pg; |
| 211 | unsigned long pg, pgend; |
| 212 | |
| 213 | /* |
| 214 | * Convert start_pfn/end_pfn to a struct page pointer. |
| 215 | */ |
| 216 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
| 217 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
| 218 | |
| 219 | /* |
| 220 | * Convert to physical addresses, and round start upwards and end |
| 221 | * downwards. |
| 222 | */ |
| 223 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); |
| 224 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; |
| 225 | |
| 226 | /* |
| 227 | * If there are free pages between these, free the section of the |
| 228 | * memmap array. |
| 229 | */ |
| 230 | if (pg < pgend) |
| 231 | free_bootmem(pg, pgend - pg); |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * The mem_map array can get very big. Free the unused area of the memory map. |
| 236 | */ |
| 237 | static void __init free_unused_memmap(void) |
| 238 | { |
| 239 | unsigned long start, prev_end = 0; |
| 240 | struct memblock_region *reg; |
| 241 | |
| 242 | for_each_memblock(memory, reg) { |
| 243 | start = __phys_to_pfn(reg->base); |
| 244 | |
| 245 | #ifdef CONFIG_SPARSEMEM |
| 246 | /* |
| 247 | * Take care not to free memmap entries that don't exist due |
| 248 | * to SPARSEMEM sections which aren't present. |
| 249 | */ |
| 250 | start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); |
| 251 | #endif |
| 252 | /* |
| 253 | * If we had a previous bank, and there is a space between the |
| 254 | * current bank and the previous, free it. |
| 255 | */ |
| 256 | if (prev_end && prev_end < start) |
| 257 | free_memmap(prev_end, start); |
| 258 | |
| 259 | /* |
| 260 | * Align up here since the VM subsystem insists that the |
| 261 | * memmap entries are valid from the bank end aligned to |
| 262 | * MAX_ORDER_NR_PAGES. |
| 263 | */ |
| 264 | prev_end = ALIGN(start + __phys_to_pfn(reg->size), |
| 265 | MAX_ORDER_NR_PAGES); |
| 266 | } |
| 267 | |
| 268 | #ifdef CONFIG_SPARSEMEM |
| 269 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) |
| 270 | free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); |
| 271 | #endif |
| 272 | } |
| 273 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ |
| 274 | |
| 275 | /* |
| 276 | * mem_init() marks the free areas in the mem_map and tells us how much memory |
| 277 | * is free. This is done after various parts of the system have claimed their |
| 278 | * memory after the kernel image. |
| 279 | */ |
| 280 | void __init mem_init(void) |
| 281 | { |
| 282 | unsigned long reserved_pages, free_pages; |
| 283 | struct memblock_region *reg; |
| 284 | |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 285 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
| 286 | |
| 287 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
| 288 | /* this will put all unused low memory onto the freelists */ |
| 289 | free_unused_memmap(); |
| 290 | #endif |
| 291 | |
| 292 | totalram_pages += free_all_bootmem(); |
| 293 | |
| 294 | reserved_pages = free_pages = 0; |
| 295 | |
| 296 | for_each_memblock(memory, reg) { |
| 297 | unsigned int pfn1, pfn2; |
| 298 | struct page *page, *end; |
| 299 | |
| 300 | pfn1 = __phys_to_pfn(reg->base); |
| 301 | pfn2 = pfn1 + __phys_to_pfn(reg->size); |
| 302 | |
| 303 | page = pfn_to_page(pfn1); |
| 304 | end = pfn_to_page(pfn2 - 1) + 1; |
| 305 | |
| 306 | do { |
| 307 | if (PageReserved(page)) |
| 308 | reserved_pages++; |
| 309 | else if (!page_count(page)) |
| 310 | free_pages++; |
| 311 | page++; |
| 312 | } while (page < end); |
| 313 | } |
| 314 | |
| 315 | /* |
| 316 | * Since our memory may not be contiguous, calculate the real number |
| 317 | * of pages we have in this system. |
| 318 | */ |
| 319 | pr_info("Memory:"); |
| 320 | num_physpages = 0; |
| 321 | for_each_memblock(memory, reg) { |
| 322 | unsigned long pages = memblock_region_memory_end_pfn(reg) - |
| 323 | memblock_region_memory_base_pfn(reg); |
| 324 | num_physpages += pages; |
| 325 | printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); |
| 326 | } |
| 327 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
| 328 | |
| 329 | pr_notice("Memory: %luk/%luk available, %luk reserved\n", |
| 330 | nr_free_pages() << (PAGE_SHIFT-10), |
| 331 | free_pages << (PAGE_SHIFT-10), |
| 332 | reserved_pages << (PAGE_SHIFT-10)); |
| 333 | |
| 334 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
| 335 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 |
| 336 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
| 337 | |
| 338 | pr_notice("Virtual kernel memory layout:\n" |
| 339 | " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" |
| 340 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 341 | " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" |
| 342 | #endif |
| 343 | " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" |
| 344 | " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" |
| 345 | " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" |
| 346 | " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" |
| 347 | " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", |
| 348 | MLM(VMALLOC_START, VMALLOC_END), |
| 349 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 350 | MLM((unsigned long)virt_to_page(PAGE_OFFSET), |
| 351 | (unsigned long)virt_to_page(high_memory)), |
| 352 | #endif |
| 353 | MLM(MODULES_VADDR, MODULES_END), |
| 354 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
| 355 | |
| 356 | MLK_ROUNDUP(__init_begin, __init_end), |
| 357 | MLK_ROUNDUP(_text, _etext), |
| 358 | MLK_ROUNDUP(_sdata, _edata)); |
| 359 | |
| 360 | #undef MLK |
| 361 | #undef MLM |
| 362 | #undef MLK_ROUNDUP |
| 363 | |
| 364 | /* |
| 365 | * Check boundaries twice: Some fundamental inconsistencies can be |
| 366 | * detected at build time already. |
| 367 | */ |
| 368 | #ifdef CONFIG_COMPAT |
| 369 | BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); |
| 370 | #endif |
| 371 | BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); |
| 372 | BUG_ON(TASK_SIZE_64 > MODULES_VADDR); |
| 373 | |
| 374 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
| 375 | extern int sysctl_overcommit_memory; |
| 376 | /* |
| 377 | * On a machine this small we won't get anywhere without |
| 378 | * overcommit, so turn it on by default. |
| 379 | */ |
| 380 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | void free_initmem(void) |
| 385 | { |
| 386 | poison_init_mem(__init_begin, __init_end - __init_begin); |
Jiang Liu | 83db038 | 2013-04-29 15:06:26 -0700 | [diff] [blame] | 387 | free_initmem_default(0); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | #ifdef CONFIG_BLK_DEV_INITRD |
| 391 | |
| 392 | static int keep_initrd; |
| 393 | |
| 394 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 395 | { |
| 396 | if (!keep_initrd) { |
| 397 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); |
Jiang Liu | 83db038 | 2013-04-29 15:06:26 -0700 | [diff] [blame] | 398 | free_reserved_area(start, end, 0, "initrd"); |
Catalin Marinas | c1cc155 | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 399 | } |
| 400 | } |
| 401 | |
| 402 | static int __init keepinitrd_setup(char *__unused) |
| 403 | { |
| 404 | keep_initrd = 1; |
| 405 | return 1; |
| 406 | } |
| 407 | |
| 408 | __setup("keepinitrd", keepinitrd_setup); |
| 409 | #endif |