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Catalin Marinasc1cc1552012-03-05 11:49:27 +00001/*
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 Marinas19e76402014-02-27 12:09:22 +000033#include <linux/dma-mapping.h>
Laura Abbott6ac21042013-12-12 19:28:33 +000034#include <linux/dma-contiguous.h>
Leif Lindholm86c8b272014-07-28 19:03:03 +010035#include <linux/efi.h>
Catalin Marinasa1e50a82015-02-05 18:01:53 +000036#include <linux/swiotlb.h>
Catalin Marinasc1cc1552012-03-05 11:49:27 +000037
Catalin Marinas08375192014-07-16 17:42:43 +010038#include <asm/fixmap.h>
Mark Rutlandaa03c422015-01-22 18:20:35 +000039#include <asm/memory.h>
Catalin Marinasc1cc1552012-03-05 11:49:27 +000040#include <asm/sections.h>
41#include <asm/setup.h>
42#include <asm/sizes.h>
43#include <asm/tlb.h>
Andre Przywarae039ee42014-11-14 15:54:08 +000044#include <asm/alternative.h>
Catalin Marinasc1cc1552012-03-05 11:49:27 +000045
46#include "mm.h"
47
Catalin Marinasc1cc1552012-03-05 11:49:27 +000048phys_addr_t memstart_addr __read_mostly = 0;
Catalin Marinasa1e50a82015-02-05 18:01:53 +000049phys_addr_t arm64_dma_phys_limit __read_mostly;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000050
Rob Herringec2eaa72013-08-25 16:47:48 -050051#ifdef CONFIG_BLK_DEV_INITRD
Catalin Marinasc1cc1552012-03-05 11:49:27 +000052static int __init early_initrd(char *p)
53{
54 unsigned long start, size;
55 char *endp;
56
57 start = memparse(p, &endp);
58 if (*endp == ',') {
59 size = memparse(endp + 1, NULL);
60
Rob Herringec2eaa72013-08-25 16:47:48 -050061 initrd_start = (unsigned long)__va(start);
62 initrd_end = (unsigned long)__va(start + size);
Catalin Marinasc1cc1552012-03-05 11:49:27 +000063 }
64 return 0;
65}
66early_param("initrd", early_initrd);
Rob Herringec2eaa72013-08-25 16:47:48 -050067#endif
Catalin Marinasc1cc1552012-03-05 11:49:27 +000068
Catalin Marinasd50314a2014-07-18 11:54:37 +010069/*
70 * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
71 * currently assumes that for memory starting above 4G, 32-bit devices will
72 * use a DMA offset.
73 */
74static phys_addr_t max_zone_dma_phys(void)
75{
76 phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
77 return min(offset + (1ULL << 32), memblock_end_of_DRAM());
78}
79
Catalin Marinasc1cc1552012-03-05 11:49:27 +000080static void __init zone_sizes_init(unsigned long min, unsigned long max)
81{
82 struct memblock_region *reg;
83 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
Catalin Marinas19e76402014-02-27 12:09:22 +000084 unsigned long max_dma = min;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000085
86 memset(zone_size, 0, sizeof(zone_size));
87
Catalin Marinasc1cc1552012-03-05 11:49:27 +000088 /* 4GB maximum for 32-bit only capable devices */
Catalin Marinas19e76402014-02-27 12:09:22 +000089 if (IS_ENABLED(CONFIG_ZONE_DMA)) {
Catalin Marinasa1e50a82015-02-05 18:01:53 +000090 max_dma = PFN_DOWN(arm64_dma_phys_limit);
Catalin Marinas19e76402014-02-27 12:09:22 +000091 zone_size[ZONE_DMA] = max_dma - min;
92 }
93 zone_size[ZONE_NORMAL] = max - max_dma;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000094
95 memcpy(zhole_size, zone_size, sizeof(zhole_size));
96
97 for_each_memblock(memory, reg) {
98 unsigned long start = memblock_region_memory_base_pfn(reg);
99 unsigned long end = memblock_region_memory_end_pfn(reg);
100
101 if (start >= max)
102 continue;
Catalin Marinas19e76402014-02-27 12:09:22 +0000103
104 if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
105 unsigned long dma_end = min(end, max_dma);
106 zhole_size[ZONE_DMA] -= dma_end - start;
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000107 }
Catalin Marinas19e76402014-02-27 12:09:22 +0000108
109 if (end > max_dma) {
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000110 unsigned long normal_end = min(end, max);
Catalin Marinas19e76402014-02-27 12:09:22 +0000111 unsigned long normal_start = max(start, max_dma);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000112 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
113 }
114 }
115
116 free_area_init_node(0, zone_size, min, zhole_size);
117}
118
119#ifdef CONFIG_HAVE_ARCH_PFN_VALID
120int pfn_valid(unsigned long pfn)
121{
122 return memblock_is_memory(pfn << PAGE_SHIFT);
123}
124EXPORT_SYMBOL(pfn_valid);
125#endif
126
127#ifndef CONFIG_SPARSEMEM
128static void arm64_memory_present(void)
129{
130}
131#else
132static void arm64_memory_present(void)
133{
134 struct memblock_region *reg;
135
136 for_each_memblock(memory, reg)
137 memory_present(0, memblock_region_memory_base_pfn(reg),
138 memblock_region_memory_end_pfn(reg));
139}
140#endif
141
Mark Rutland6083fe742015-01-15 16:42:14 +0000142static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX;
143
144/*
145 * Limit the memory size that was specified via FDT.
146 */
147static int __init early_mem(char *p)
148{
149 if (!p)
150 return 1;
151
152 memory_limit = memparse(p, &p) & PAGE_MASK;
153 pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
154
155 return 0;
156}
157early_param("mem", early_mem);
158
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000159void __init arm64_memblock_init(void)
160{
Mark Rutland6083fe742015-01-15 16:42:14 +0000161 memblock_enforce_memory_limit(memory_limit);
162
Mark Rutlandbd00cd52014-06-24 16:51:35 +0100163 /*
164 * Register the kernel text, kernel data, initrd, and initial
165 * pagetables with memblock.
166 */
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000167 memblock_reserve(__pa(_text), _end - _text);
168#ifdef CONFIG_BLK_DEV_INITRD
Rob Herringec2eaa72013-08-25 16:47:48 -0500169 if (initrd_start)
170 memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000171#endif
172
Mark Salter0ceac9e2014-09-08 13:01:08 -0400173 early_init_fdt_scan_reserved_mem();
Catalin Marinas2d5a5612014-06-13 13:41:20 +0100174
175 /* 4GB maximum for 32-bit only capable devices */
176 if (IS_ENABLED(CONFIG_ZONE_DMA))
Catalin Marinasa1e50a82015-02-05 18:01:53 +0000177 arm64_dma_phys_limit = max_zone_dma_phys();
178 else
179 arm64_dma_phys_limit = PHYS_MASK + 1;
180 dma_contiguous_reserve(arm64_dma_phys_limit);
Laura Abbott6ac21042013-12-12 19:28:33 +0000181
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000182 memblock_allow_resize();
183 memblock_dump_all();
184}
185
186void __init bootmem_init(void)
187{
188 unsigned long min, max;
189
190 min = PFN_UP(memblock_start_of_DRAM());
191 max = PFN_DOWN(memblock_end_of_DRAM());
192
193 /*
194 * Sparsemem tries to allocate bootmem in memory_present(), so must be
195 * done after the fixed reservations.
196 */
197 arm64_memory_present();
198
199 sparse_init();
200 zone_sizes_init(min, max);
201
202 high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
203 max_pfn = max_low_pfn = max;
204}
205
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000206#ifndef CONFIG_SPARSEMEM_VMEMMAP
207static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
208{
209 struct page *start_pg, *end_pg;
210 unsigned long pg, pgend;
211
212 /*
213 * Convert start_pfn/end_pfn to a struct page pointer.
214 */
215 start_pg = pfn_to_page(start_pfn - 1) + 1;
216 end_pg = pfn_to_page(end_pfn - 1) + 1;
217
218 /*
219 * Convert to physical addresses, and round start upwards and end
220 * downwards.
221 */
222 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
223 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
224
225 /*
226 * If there are free pages between these, free the section of the
227 * memmap array.
228 */
229 if (pg < pgend)
230 free_bootmem(pg, pgend - pg);
231}
232
233/*
234 * The mem_map array can get very big. Free the unused area of the memory map.
235 */
236static void __init free_unused_memmap(void)
237{
238 unsigned long start, prev_end = 0;
239 struct memblock_region *reg;
240
241 for_each_memblock(memory, reg) {
242 start = __phys_to_pfn(reg->base);
243
244#ifdef CONFIG_SPARSEMEM
245 /*
246 * Take care not to free memmap entries that don't exist due
247 * to SPARSEMEM sections which aren't present.
248 */
249 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
250#endif
251 /*
252 * If we had a previous bank, and there is a space between the
253 * current bank and the previous, free it.
254 */
255 if (prev_end && prev_end < start)
256 free_memmap(prev_end, start);
257
258 /*
259 * Align up here since the VM subsystem insists that the
260 * memmap entries are valid from the bank end aligned to
261 * MAX_ORDER_NR_PAGES.
262 */
263 prev_end = ALIGN(start + __phys_to_pfn(reg->size),
264 MAX_ORDER_NR_PAGES);
265 }
266
267#ifdef CONFIG_SPARSEMEM
268 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
269 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
270#endif
271}
272#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
273
274/*
275 * mem_init() marks the free areas in the mem_map and tells us how much memory
276 * is free. This is done after various parts of the system have claimed their
277 * memory after the kernel image.
278 */
279void __init mem_init(void)
280{
Catalin Marinasa1e50a82015-02-05 18:01:53 +0000281 swiotlb_init(1);
282
Ganapatrao Kulkarnia6583c72014-09-16 18:53:54 +0100283 set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000284
285#ifndef CONFIG_SPARSEMEM_VMEMMAP
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000286 free_unused_memmap();
287#endif
Jiang Liubee4ebd2013-07-03 15:03:49 -0700288 /* this will put all unused low memory onto the freelists */
Jiang Liu0c988532013-07-03 15:03:24 -0700289 free_all_bootmem();
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000290
Jiang Liu6879ea82013-07-03 15:04:02 -0700291 mem_init_print_info(NULL);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000292
293#define MLK(b, t) b, t, ((t) - (b)) >> 10
294#define MLM(b, t) b, t, ((t) - (b)) >> 20
Catalin Marinas08375192014-07-16 17:42:43 +0100295#define MLG(b, t) b, t, ((t) - (b)) >> 30
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000296#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
297
298 pr_notice("Virtual kernel memory layout:\n"
Catalin Marinas08375192014-07-16 17:42:43 +0100299 " vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n"
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000300#ifdef CONFIG_SPARSEMEM_VMEMMAP
Catalin Marinas08375192014-07-16 17:42:43 +0100301 " vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n"
302 " 0x%16lx - 0x%16lx (%6ld MB actual)\n"
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000303#endif
Catalin Marinas08375192014-07-16 17:42:43 +0100304 " fixed : 0x%16lx - 0x%16lx (%6ld KB)\n"
Mark Rutlandaa03c422015-01-22 18:20:35 +0000305 " PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n"
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000306 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
307 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
Catalin Marinas08375192014-07-16 17:42:43 +0100308 " .init : 0x%p" " - 0x%p" " (%6ld KB)\n"
309 " .text : 0x%p" " - 0x%p" " (%6ld KB)\n"
310 " .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
311 MLG(VMALLOC_START, VMALLOC_END),
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000312#ifdef CONFIG_SPARSEMEM_VMEMMAP
Catalin Marinas08375192014-07-16 17:42:43 +0100313 MLG((unsigned long)vmemmap,
314 (unsigned long)vmemmap + VMEMMAP_SIZE),
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000315 MLM((unsigned long)virt_to_page(PAGE_OFFSET),
316 (unsigned long)virt_to_page(high_memory)),
317#endif
Catalin Marinas08375192014-07-16 17:42:43 +0100318 MLK(FIXADDR_START, FIXADDR_TOP),
Mark Rutlandaa03c422015-01-22 18:20:35 +0000319 MLM(PCI_IO_START, PCI_IO_END),
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000320 MLM(MODULES_VADDR, MODULES_END),
321 MLM(PAGE_OFFSET, (unsigned long)high_memory),
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000322 MLK_ROUNDUP(__init_begin, __init_end),
323 MLK_ROUNDUP(_text, _etext),
324 MLK_ROUNDUP(_sdata, _edata));
325
326#undef MLK
327#undef MLM
328#undef MLK_ROUNDUP
329
330 /*
331 * Check boundaries twice: Some fundamental inconsistencies can be
332 * detected at build time already.
333 */
334#ifdef CONFIG_COMPAT
335 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
336#endif
337 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
338 BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
339
Jiang Liubee4ebd2013-07-03 15:03:49 -0700340 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000341 extern int sysctl_overcommit_memory;
342 /*
343 * On a machine this small we won't get anywhere without
344 * overcommit, so turn it on by default.
345 */
346 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
347 }
348}
349
350void free_initmem(void)
351{
Laura Abbottda141702015-01-21 17:36:06 -0800352 fixup_init();
Jiang Liu9af5b802013-07-03 15:02:54 -0700353 free_initmem_default(0);
Andre Przywarae039ee42014-11-14 15:54:08 +0000354 free_alternatives_memory();
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000355}
356
357#ifdef CONFIG_BLK_DEV_INITRD
358
359static int keep_initrd;
360
361void free_initrd_mem(unsigned long start, unsigned long end)
362{
Catalin Marinas01450582015-01-16 13:56:38 +0000363 if (!keep_initrd)
Jiang Liu9af5b802013-07-03 15:02:54 -0700364 free_reserved_area((void *)start, (void *)end, 0, "initrd");
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000365}
366
367static int __init keepinitrd_setup(char *__unused)
368{
369 keep_initrd = 1;
370 return 1;
371}
372
373__setup("keepinitrd", keepinitrd_setup);
374#endif