Merge tag 'v3.10.58' into linux-linaro-lsk
[firefly-linux-kernel-4.4.55.git] / arch / arm64 / mm / init.c
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>
33 #include <linux/dma-mapping.h>
34 #include <linux/dma-contiguous.h>
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
49 void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
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
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];
75         unsigned long max_dma = min;
76
77         memset(zone_size, 0, sizeof(zone_size));
78
79         /* 4GB maximum for 32-bit only capable devices */
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;
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;
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;
100                 }
101
102                 if (end > max_dma) {
103                         unsigned long normal_end = min(end, max);
104                         unsigned long normal_start = max(start, max_dma);
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
139         /*
140          * Register the kernel text, kernel data, initrd, and initial
141          * pagetables with memblock.
142          */
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
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
173         early_init_fdt_scan_reserved_mem();
174         dma_contiguous_reserve(0);
175
176         memblock_allow_resize();
177         memblock_dump_all();
178 }
179
180 void __init bootmem_init(void)
181 {
182         unsigned long min, max;
183
184         min = PFN_UP(memblock_start_of_DRAM());
185         max = PFN_DOWN(memblock_end_of_DRAM());
186
187         /*
188          * Sparsemem tries to allocate bootmem in memory_present(), so must be
189          * done after the fixed reservations.
190          */
191         arm64_memory_present();
192
193         sparse_init();
194         zone_sizes_init(min, max);
195
196         high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
197         max_pfn = max_low_pfn = max;
198 }
199
200 /*
201  * Poison init memory with an undefined instruction (0x0).
202  */
203 static inline void poison_init_mem(void *s, size_t count)
204 {
205         memset(s, 0, count);
206 }
207
208 #ifndef CONFIG_SPARSEMEM_VMEMMAP
209 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
210 {
211         struct page *start_pg, *end_pg;
212         unsigned long pg, pgend;
213
214         /*
215          * Convert start_pfn/end_pfn to a struct page pointer.
216          */
217         start_pg = pfn_to_page(start_pfn - 1) + 1;
218         end_pg = pfn_to_page(end_pfn - 1) + 1;
219
220         /*
221          * Convert to physical addresses, and round start upwards and end
222          * downwards.
223          */
224         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
225         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
226
227         /*
228          * If there are free pages between these, free the section of the
229          * memmap array.
230          */
231         if (pg < pgend)
232                 free_bootmem(pg, pgend - pg);
233 }
234
235 /*
236  * The mem_map array can get very big. Free the unused area of the memory map.
237  */
238 static void __init free_unused_memmap(void)
239 {
240         unsigned long start, prev_end = 0;
241         struct memblock_region *reg;
242
243         for_each_memblock(memory, reg) {
244                 start = __phys_to_pfn(reg->base);
245
246 #ifdef CONFIG_SPARSEMEM
247                 /*
248                  * Take care not to free memmap entries that don't exist due
249                  * to SPARSEMEM sections which aren't present.
250                  */
251                 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
252 #endif
253                 /*
254                  * If we had a previous bank, and there is a space between the
255                  * current bank and the previous, free it.
256                  */
257                 if (prev_end && prev_end < start)
258                         free_memmap(prev_end, start);
259
260                 /*
261                  * Align up here since the VM subsystem insists that the
262                  * memmap entries are valid from the bank end aligned to
263                  * MAX_ORDER_NR_PAGES.
264                  */
265                 prev_end = ALIGN(start + __phys_to_pfn(reg->size),
266                                  MAX_ORDER_NR_PAGES);
267         }
268
269 #ifdef CONFIG_SPARSEMEM
270         if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
271                 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
272 #endif
273 }
274 #endif  /* !CONFIG_SPARSEMEM_VMEMMAP */
275
276 /*
277  * mem_init() marks the free areas in the mem_map and tells us how much memory
278  * is free.  This is done after various parts of the system have claimed their
279  * memory after the kernel image.
280  */
281 void __init mem_init(void)
282 {
283         unsigned long reserved_pages, free_pages;
284         struct memblock_region *reg;
285
286         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
287
288 #ifndef CONFIG_SPARSEMEM_VMEMMAP
289         /* this will put all unused low memory onto the freelists */
290         free_unused_memmap();
291 #endif
292
293         totalram_pages += free_all_bootmem();
294
295         reserved_pages = free_pages = 0;
296
297         for_each_memblock(memory, reg) {
298                 unsigned int pfn1, pfn2;
299                 struct page *page, *end;
300
301                 pfn1 = __phys_to_pfn(reg->base);
302                 pfn2 = pfn1 + __phys_to_pfn(reg->size);
303
304                 page = pfn_to_page(pfn1);
305                 end  = pfn_to_page(pfn2 - 1) + 1;
306
307                 do {
308                         if (PageReserved(page))
309                                 reserved_pages++;
310                         else if (!page_count(page))
311                                 free_pages++;
312                         page++;
313                 } while (page < end);
314         }
315
316         /*
317          * Since our memory may not be contiguous, calculate the real number
318          * of pages we have in this system.
319          */
320         pr_info("Memory:");
321         num_physpages = 0;
322         for_each_memblock(memory, reg) {
323                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
324                         memblock_region_memory_base_pfn(reg);
325                 num_physpages += pages;
326                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
327         }
328         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
329
330         pr_notice("Memory: %luk/%luk available, %luk reserved\n",
331                   nr_free_pages() << (PAGE_SHIFT-10),
332                   free_pages << (PAGE_SHIFT-10),
333                   reserved_pages << (PAGE_SHIFT-10));
334
335 #define MLK(b, t) b, t, ((t) - (b)) >> 10
336 #define MLM(b, t) b, t, ((t) - (b)) >> 20
337 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
338
339         pr_notice("Virtual kernel memory layout:\n"
340                   "    vmalloc : 0x%16lx - 0x%16lx   (%6ld MB)\n"
341 #ifdef CONFIG_SPARSEMEM_VMEMMAP
342                   "    vmemmap : 0x%16lx - 0x%16lx   (%6ld MB)\n"
343 #endif
344                   "    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n"
345                   "    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n"
346                   "      .init : 0x%p" " - 0x%p" "   (%6ld kB)\n"
347                   "      .text : 0x%p" " - 0x%p" "   (%6ld kB)\n"
348                   "      .data : 0x%p" " - 0x%p" "   (%6ld kB)\n",
349                   MLM(VMALLOC_START, VMALLOC_END),
350 #ifdef CONFIG_SPARSEMEM_VMEMMAP
351                   MLM((unsigned long)virt_to_page(PAGE_OFFSET),
352                       (unsigned long)virt_to_page(high_memory)),
353 #endif
354                   MLM(MODULES_VADDR, MODULES_END),
355                   MLM(PAGE_OFFSET, (unsigned long)high_memory),
356
357                   MLK_ROUNDUP(__init_begin, __init_end),
358                   MLK_ROUNDUP(_text, _etext),
359                   MLK_ROUNDUP(_sdata, _edata));
360
361 #undef MLK
362 #undef MLM
363 #undef MLK_ROUNDUP
364
365         /*
366          * Check boundaries twice: Some fundamental inconsistencies can be
367          * detected at build time already.
368          */
369 #ifdef CONFIG_COMPAT
370         BUILD_BUG_ON(TASK_SIZE_32                       > TASK_SIZE_64);
371 #endif
372         BUILD_BUG_ON(TASK_SIZE_64                       > MODULES_VADDR);
373         BUG_ON(TASK_SIZE_64                             > MODULES_VADDR);
374
375         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
376                 extern int sysctl_overcommit_memory;
377                 /*
378                  * On a machine this small we won't get anywhere without
379                  * overcommit, so turn it on by default.
380                  */
381                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
382         }
383 }
384
385 void free_initmem(void)
386 {
387         poison_init_mem(__init_begin, __init_end - __init_begin);
388         free_initmem_default(0);
389 }
390
391 #ifdef CONFIG_BLK_DEV_INITRD
392
393 static int keep_initrd;
394
395 void free_initrd_mem(unsigned long start, unsigned long end)
396 {
397         if (!keep_initrd) {
398                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
399                 free_reserved_area(start, end, 0, "initrd");
400         }
401 }
402
403 static int __init keepinitrd_setup(char *__unused)
404 {
405         keep_initrd = 1;
406         return 1;
407 }
408
409 __setup("keepinitrd", keepinitrd_setup);
410 #endif