Merge branch 'omap-serial' of git://git.linaro.org/people/rmk/linux-arm
[~shefty/rdma-dev.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
34 #include <asm/prom.h>
35 #include <asm/sections.h>
36 #include <asm/setup.h>
37 #include <asm/sizes.h>
38 #include <asm/tlb.h>
39
40 #include "mm.h"
41
42 static unsigned long phys_initrd_start __initdata = 0;
43 static unsigned long phys_initrd_size __initdata = 0;
44
45 phys_addr_t memstart_addr __read_mostly = 0;
46
47 void __init early_init_dt_setup_initrd_arch(unsigned long start,
48                                             unsigned long end)
49 {
50         phys_initrd_start = start;
51         phys_initrd_size = end - start;
52 }
53
54 static int __init early_initrd(char *p)
55 {
56         unsigned long start, size;
57         char *endp;
58
59         start = memparse(p, &endp);
60         if (*endp == ',') {
61                 size = memparse(endp + 1, NULL);
62
63                 phys_initrd_start = start;
64                 phys_initrd_size = size;
65         }
66         return 0;
67 }
68 early_param("initrd", early_initrd);
69
70 #define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
71
72 static void __init zone_sizes_init(unsigned long min, unsigned long max)
73 {
74         struct memblock_region *reg;
75         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
76         unsigned long max_dma32 = min;
77
78         memset(zone_size, 0, sizeof(zone_size));
79
80 #ifdef CONFIG_ZONE_DMA32
81         /* 4GB maximum for 32-bit only capable devices */
82         max_dma32 = min(max, MAX_DMA32_PFN);
83         zone_size[ZONE_DMA32] = max(min, max_dma32) - min;
84 #endif
85         zone_size[ZONE_NORMAL] = max - max_dma32;
86
87         memcpy(zhole_size, zone_size, sizeof(zhole_size));
88
89         for_each_memblock(memory, reg) {
90                 unsigned long start = memblock_region_memory_base_pfn(reg);
91                 unsigned long end = memblock_region_memory_end_pfn(reg);
92
93                 if (start >= max)
94                         continue;
95 #ifdef CONFIG_ZONE_DMA32
96                 if (start < max_dma32) {
97                         unsigned long dma_end = min(end, max_dma32);
98                         zhole_size[ZONE_DMA32] -= dma_end - start;
99                 }
100 #endif
101                 if (end > max_dma32) {
102                         unsigned long normal_end = min(end, max);
103                         unsigned long normal_start = max(start, max_dma32);
104                         zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
105                 }
106         }
107
108         free_area_init_node(0, zone_size, min, zhole_size);
109 }
110
111 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
112 int pfn_valid(unsigned long pfn)
113 {
114         return memblock_is_memory(pfn << PAGE_SHIFT);
115 }
116 EXPORT_SYMBOL(pfn_valid);
117 #endif
118
119 #ifndef CONFIG_SPARSEMEM
120 static void arm64_memory_present(void)
121 {
122 }
123 #else
124 static void arm64_memory_present(void)
125 {
126         struct memblock_region *reg;
127
128         for_each_memblock(memory, reg)
129                 memory_present(0, memblock_region_memory_base_pfn(reg),
130                                memblock_region_memory_end_pfn(reg));
131 }
132 #endif
133
134 void __init arm64_memblock_init(void)
135 {
136         u64 *reserve_map, base, size;
137
138         /* Register the kernel text, kernel data and initrd with memblock */
139         memblock_reserve(__pa(_text), _end - _text);
140 #ifdef CONFIG_BLK_DEV_INITRD
141         if (phys_initrd_size) {
142                 memblock_reserve(phys_initrd_start, phys_initrd_size);
143
144                 /* Now convert initrd to virtual addresses */
145                 initrd_start = __phys_to_virt(phys_initrd_start);
146                 initrd_end = initrd_start + phys_initrd_size;
147         }
148 #endif
149
150         /*
151          * Reserve the page tables.  These are already in use,
152          * and can only be in node 0.
153          */
154         memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
155         memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
156
157         /* Reserve the dtb region */
158         memblock_reserve(virt_to_phys(initial_boot_params),
159                          be32_to_cpu(initial_boot_params->totalsize));
160
161         /*
162          * Process the reserve map.  This will probably overlap the initrd
163          * and dtb locations which are already reserved, but overlapping
164          * doesn't hurt anything
165          */
166         reserve_map = ((void*)initial_boot_params) +
167                         be32_to_cpu(initial_boot_params->off_mem_rsvmap);
168         while (1) {
169                 base = be64_to_cpup(reserve_map++);
170                 size = be64_to_cpup(reserve_map++);
171                 if (!size)
172                         break;
173                 memblock_reserve(base, size);
174         }
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 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
201 {
202         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
203
204         for (; pfn < end; pfn++) {
205                 struct page *page = pfn_to_page(pfn);
206                 ClearPageReserved(page);
207                 init_page_count(page);
208                 __free_page(page);
209                 pages++;
210         }
211
212         if (size && s)
213                 pr_info("Freeing %s memory: %dK\n", s, size);
214
215         return pages;
216 }
217
218 /*
219  * Poison init memory with an undefined instruction (0x0).
220  */
221 static inline void poison_init_mem(void *s, size_t count)
222 {
223         memset(s, 0, count);
224 }
225
226 #ifndef CONFIG_SPARSEMEM_VMEMMAP
227 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
228 {
229         struct page *start_pg, *end_pg;
230         unsigned long pg, pgend;
231
232         /*
233          * Convert start_pfn/end_pfn to a struct page pointer.
234          */
235         start_pg = pfn_to_page(start_pfn - 1) + 1;
236         end_pg = pfn_to_page(end_pfn - 1) + 1;
237
238         /*
239          * Convert to physical addresses, and round start upwards and end
240          * downwards.
241          */
242         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
243         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
244
245         /*
246          * If there are free pages between these, free the section of the
247          * memmap array.
248          */
249         if (pg < pgend)
250                 free_bootmem(pg, pgend - pg);
251 }
252
253 /*
254  * The mem_map array can get very big. Free the unused area of the memory map.
255  */
256 static void __init free_unused_memmap(void)
257 {
258         unsigned long start, prev_end = 0;
259         struct memblock_region *reg;
260
261         for_each_memblock(memory, reg) {
262                 start = __phys_to_pfn(reg->base);
263
264 #ifdef CONFIG_SPARSEMEM
265                 /*
266                  * Take care not to free memmap entries that don't exist due
267                  * to SPARSEMEM sections which aren't present.
268                  */
269                 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
270 #endif
271                 /*
272                  * If we had a previous bank, and there is a space between the
273                  * current bank and the previous, free it.
274                  */
275                 if (prev_end && prev_end < start)
276                         free_memmap(prev_end, start);
277
278                 /*
279                  * Align up here since the VM subsystem insists that the
280                  * memmap entries are valid from the bank end aligned to
281                  * MAX_ORDER_NR_PAGES.
282                  */
283                 prev_end = ALIGN(start + __phys_to_pfn(reg->size),
284                                  MAX_ORDER_NR_PAGES);
285         }
286
287 #ifdef CONFIG_SPARSEMEM
288         if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
289                 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
290 #endif
291 }
292 #endif  /* !CONFIG_SPARSEMEM_VMEMMAP */
293
294 /*
295  * mem_init() marks the free areas in the mem_map and tells us how much memory
296  * is free.  This is done after various parts of the system have claimed their
297  * memory after the kernel image.
298  */
299 void __init mem_init(void)
300 {
301         unsigned long reserved_pages, free_pages;
302         struct memblock_region *reg;
303
304         arm64_swiotlb_init();
305
306         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
307
308 #ifndef CONFIG_SPARSEMEM_VMEMMAP
309         /* this will put all unused low memory onto the freelists */
310         free_unused_memmap();
311 #endif
312
313         totalram_pages += free_all_bootmem();
314
315         reserved_pages = free_pages = 0;
316
317         for_each_memblock(memory, reg) {
318                 unsigned int pfn1, pfn2;
319                 struct page *page, *end;
320
321                 pfn1 = __phys_to_pfn(reg->base);
322                 pfn2 = pfn1 + __phys_to_pfn(reg->size);
323
324                 page = pfn_to_page(pfn1);
325                 end  = pfn_to_page(pfn2 - 1) + 1;
326
327                 do {
328                         if (PageReserved(page))
329                                 reserved_pages++;
330                         else if (!page_count(page))
331                                 free_pages++;
332                         page++;
333                 } while (page < end);
334         }
335
336         /*
337          * Since our memory may not be contiguous, calculate the real number
338          * of pages we have in this system.
339          */
340         pr_info("Memory:");
341         num_physpages = 0;
342         for_each_memblock(memory, reg) {
343                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
344                         memblock_region_memory_base_pfn(reg);
345                 num_physpages += pages;
346                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
347         }
348         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
349
350         pr_notice("Memory: %luk/%luk available, %luk reserved\n",
351                   nr_free_pages() << (PAGE_SHIFT-10),
352                   free_pages << (PAGE_SHIFT-10),
353                   reserved_pages << (PAGE_SHIFT-10));
354
355 #define MLK(b, t) b, t, ((t) - (b)) >> 10
356 #define MLM(b, t) b, t, ((t) - (b)) >> 20
357 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
358
359         pr_notice("Virtual kernel memory layout:\n"
360                   "    vmalloc : 0x%16lx - 0x%16lx   (%6ld MB)\n"
361 #ifdef CONFIG_SPARSEMEM_VMEMMAP
362                   "    vmemmap : 0x%16lx - 0x%16lx   (%6ld MB)\n"
363 #endif
364                   "    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n"
365                   "    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n"
366                   "      .init : 0x%p" " - 0x%p" "   (%6ld kB)\n"
367                   "      .text : 0x%p" " - 0x%p" "   (%6ld kB)\n"
368                   "      .data : 0x%p" " - 0x%p" "   (%6ld kB)\n",
369                   MLM(VMALLOC_START, VMALLOC_END),
370 #ifdef CONFIG_SPARSEMEM_VMEMMAP
371                   MLM((unsigned long)virt_to_page(PAGE_OFFSET),
372                       (unsigned long)virt_to_page(high_memory)),
373 #endif
374                   MLM(MODULES_VADDR, MODULES_END),
375                   MLM(PAGE_OFFSET, (unsigned long)high_memory),
376
377                   MLK_ROUNDUP(__init_begin, __init_end),
378                   MLK_ROUNDUP(_text, _etext),
379                   MLK_ROUNDUP(_sdata, _edata));
380
381 #undef MLK
382 #undef MLM
383 #undef MLK_ROUNDUP
384
385         /*
386          * Check boundaries twice: Some fundamental inconsistencies can be
387          * detected at build time already.
388          */
389 #ifdef CONFIG_COMPAT
390         BUILD_BUG_ON(TASK_SIZE_32                       > TASK_SIZE_64);
391 #endif
392         BUILD_BUG_ON(TASK_SIZE_64                       > MODULES_VADDR);
393         BUG_ON(TASK_SIZE_64                             > MODULES_VADDR);
394
395         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
396                 extern int sysctl_overcommit_memory;
397                 /*
398                  * On a machine this small we won't get anywhere without
399                  * overcommit, so turn it on by default.
400                  */
401                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
402         }
403 }
404
405 void free_initmem(void)
406 {
407         poison_init_mem(__init_begin, __init_end - __init_begin);
408         totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
409                                     __phys_to_pfn(__pa(__init_end)),
410                                     "init");
411 }
412
413 #ifdef CONFIG_BLK_DEV_INITRD
414
415 static int keep_initrd;
416
417 void free_initrd_mem(unsigned long start, unsigned long end)
418 {
419         if (!keep_initrd) {
420                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
421                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
422                                             __phys_to_pfn(__pa(end)),
423                                             "initrd");
424         }
425 }
426
427 static int __init keepinitrd_setup(char *__unused)
428 {
429         keep_initrd = 1;
430         return 1;
431 }
432
433 __setup("keepinitrd", keepinitrd_setup);
434 #endif