Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/x86_64/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1995 Linus Torvalds | |
a2531293 | 5 | * Copyright (C) 2000 Pavel Machek <pavel@ucw.cz> |
1da177e4 LT |
6 | * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de> |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/signal.h> |
10 | #include <linux/sched.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/ptrace.h> | |
16 | #include <linux/mman.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/swap.h> | |
19 | #include <linux/smp.h> | |
20 | #include <linux/init.h> | |
11034d55 | 21 | #include <linux/initrd.h> |
1da177e4 LT |
22 | #include <linux/pagemap.h> |
23 | #include <linux/bootmem.h> | |
a9ce6bc1 | 24 | #include <linux/memblock.h> |
1da177e4 | 25 | #include <linux/proc_fs.h> |
59170891 | 26 | #include <linux/pci.h> |
6fb14755 | 27 | #include <linux/pfn.h> |
c9cf5528 | 28 | #include <linux/poison.h> |
17a941d8 | 29 | #include <linux/dma-mapping.h> |
44df75e6 | 30 | #include <linux/module.h> |
a63fdc51 | 31 | #include <linux/memory.h> |
44df75e6 | 32 | #include <linux/memory_hotplug.h> |
4b94ffdc | 33 | #include <linux/memremap.h> |
ae32b129 | 34 | #include <linux/nmi.h> |
5a0e3ad6 | 35 | #include <linux/gfp.h> |
2f96b8c1 | 36 | #include <linux/kcore.h> |
1da177e4 LT |
37 | |
38 | #include <asm/processor.h> | |
46eaa670 | 39 | #include <asm/bios_ebda.h> |
1da177e4 LT |
40 | #include <asm/uaccess.h> |
41 | #include <asm/pgtable.h> | |
42 | #include <asm/pgalloc.h> | |
43 | #include <asm/dma.h> | |
44 | #include <asm/fixmap.h> | |
45 | #include <asm/e820.h> | |
46 | #include <asm/apic.h> | |
47 | #include <asm/tlb.h> | |
48 | #include <asm/mmu_context.h> | |
49 | #include <asm/proto.h> | |
50 | #include <asm/smp.h> | |
2bc0414e | 51 | #include <asm/sections.h> |
718fc13b | 52 | #include <asm/kdebug.h> |
aaa64e04 | 53 | #include <asm/numa.h> |
7bfeab9a | 54 | #include <asm/cacheflush.h> |
4fcb2083 | 55 | #include <asm/init.h> |
43c75f93 | 56 | #include <asm/uv/uv.h> |
e5f15b45 | 57 | #include <asm/setup.h> |
1da177e4 | 58 | |
5c51bdbe YL |
59 | #include "mm_internal.h" |
60 | ||
aece2785 YL |
61 | static void ident_pmd_init(unsigned long pmd_flag, pmd_t *pmd_page, |
62 | unsigned long addr, unsigned long end) | |
63 | { | |
64 | addr &= PMD_MASK; | |
65 | for (; addr < end; addr += PMD_SIZE) { | |
66 | pmd_t *pmd = pmd_page + pmd_index(addr); | |
67 | ||
68 | if (!pmd_present(*pmd)) | |
69 | set_pmd(pmd, __pmd(addr | pmd_flag)); | |
70 | } | |
71 | } | |
72 | static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page, | |
73 | unsigned long addr, unsigned long end) | |
74 | { | |
75 | unsigned long next; | |
76 | ||
77 | for (; addr < end; addr = next) { | |
78 | pud_t *pud = pud_page + pud_index(addr); | |
79 | pmd_t *pmd; | |
80 | ||
81 | next = (addr & PUD_MASK) + PUD_SIZE; | |
82 | if (next > end) | |
83 | next = end; | |
84 | ||
85 | if (pud_present(*pud)) { | |
86 | pmd = pmd_offset(pud, 0); | |
87 | ident_pmd_init(info->pmd_flag, pmd, addr, next); | |
88 | continue; | |
89 | } | |
90 | pmd = (pmd_t *)info->alloc_pgt_page(info->context); | |
91 | if (!pmd) | |
92 | return -ENOMEM; | |
93 | ident_pmd_init(info->pmd_flag, pmd, addr, next); | |
94 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); | |
95 | } | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page, | |
101 | unsigned long addr, unsigned long end) | |
102 | { | |
103 | unsigned long next; | |
104 | int result; | |
105 | int off = info->kernel_mapping ? pgd_index(__PAGE_OFFSET) : 0; | |
106 | ||
107 | for (; addr < end; addr = next) { | |
108 | pgd_t *pgd = pgd_page + pgd_index(addr) + off; | |
109 | pud_t *pud; | |
110 | ||
111 | next = (addr & PGDIR_MASK) + PGDIR_SIZE; | |
112 | if (next > end) | |
113 | next = end; | |
114 | ||
115 | if (pgd_present(*pgd)) { | |
116 | pud = pud_offset(pgd, 0); | |
117 | result = ident_pud_init(info, pud, addr, next); | |
118 | if (result) | |
119 | return result; | |
120 | continue; | |
121 | } | |
122 | ||
123 | pud = (pud_t *)info->alloc_pgt_page(info->context); | |
124 | if (!pud) | |
125 | return -ENOMEM; | |
126 | result = ident_pud_init(info, pud, addr, next); | |
127 | if (result) | |
128 | return result; | |
129 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE)); | |
130 | } | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
1da177e4 LT |
135 | /* |
136 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
137 | * physical space so we can cache the place of the first one and move | |
138 | * around without checking the pgd every time. | |
139 | */ | |
140 | ||
f955371c | 141 | pteval_t __supported_pte_mask __read_mostly = ~0; |
bd220a24 YL |
142 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
143 | ||
bd220a24 YL |
144 | int force_personality32; |
145 | ||
deed05b7 IM |
146 | /* |
147 | * noexec32=on|off | |
148 | * Control non executable heap for 32bit processes. | |
149 | * To control the stack too use noexec=off | |
150 | * | |
151 | * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) | |
152 | * off PROT_READ implies PROT_EXEC | |
153 | */ | |
bd220a24 YL |
154 | static int __init nonx32_setup(char *str) |
155 | { | |
156 | if (!strcmp(str, "on")) | |
157 | force_personality32 &= ~READ_IMPLIES_EXEC; | |
158 | else if (!strcmp(str, "off")) | |
159 | force_personality32 |= READ_IMPLIES_EXEC; | |
160 | return 1; | |
161 | } | |
162 | __setup("noexec32=", nonx32_setup); | |
163 | ||
6afb5157 HL |
164 | /* |
165 | * When memory was added/removed make sure all the processes MM have | |
166 | * suitable PGD entries in the local PGD level page. | |
167 | */ | |
9661d5bc | 168 | void sync_global_pgds(unsigned long start, unsigned long end, int removed) |
6afb5157 | 169 | { |
44235dcd JF |
170 | unsigned long address; |
171 | ||
172 | for (address = start; address <= end; address += PGDIR_SIZE) { | |
173 | const pgd_t *pgd_ref = pgd_offset_k(address); | |
44235dcd JF |
174 | struct page *page; |
175 | ||
9661d5bc YI |
176 | /* |
177 | * When it is called after memory hot remove, pgd_none() | |
178 | * returns true. In this case (removed == 1), we must clear | |
179 | * the PGD entries in the local PGD level page. | |
180 | */ | |
181 | if (pgd_none(*pgd_ref) && !removed) | |
44235dcd JF |
182 | continue; |
183 | ||
a79e53d8 | 184 | spin_lock(&pgd_lock); |
44235dcd | 185 | list_for_each_entry(page, &pgd_list, lru) { |
be354f40 | 186 | pgd_t *pgd; |
617d34d9 JF |
187 | spinlock_t *pgt_lock; |
188 | ||
44235dcd | 189 | pgd = (pgd_t *)page_address(page) + pgd_index(address); |
a79e53d8 | 190 | /* the pgt_lock only for Xen */ |
617d34d9 JF |
191 | pgt_lock = &pgd_page_get_mm(page)->page_table_lock; |
192 | spin_lock(pgt_lock); | |
193 | ||
9661d5bc | 194 | if (!pgd_none(*pgd_ref) && !pgd_none(*pgd)) |
44235dcd JF |
195 | BUG_ON(pgd_page_vaddr(*pgd) |
196 | != pgd_page_vaddr(*pgd_ref)); | |
617d34d9 | 197 | |
9661d5bc YI |
198 | if (removed) { |
199 | if (pgd_none(*pgd_ref) && !pgd_none(*pgd)) | |
200 | pgd_clear(pgd); | |
201 | } else { | |
202 | if (pgd_none(*pgd)) | |
203 | set_pgd(pgd, *pgd_ref); | |
204 | } | |
205 | ||
617d34d9 | 206 | spin_unlock(pgt_lock); |
44235dcd | 207 | } |
a79e53d8 | 208 | spin_unlock(&pgd_lock); |
44235dcd | 209 | } |
6afb5157 HL |
210 | } |
211 | ||
8d6ea967 MS |
212 | /* |
213 | * NOTE: This function is marked __ref because it calls __init function | |
214 | * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. | |
215 | */ | |
216 | static __ref void *spp_getpage(void) | |
14a62c34 | 217 | { |
1da177e4 | 218 | void *ptr; |
14a62c34 | 219 | |
1da177e4 | 220 | if (after_bootmem) |
9e730237 | 221 | ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); |
1da177e4 LT |
222 | else |
223 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
14a62c34 TG |
224 | |
225 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { | |
226 | panic("set_pte_phys: cannot allocate page data %s\n", | |
227 | after_bootmem ? "after bootmem" : ""); | |
228 | } | |
1da177e4 | 229 | |
10f22dde | 230 | pr_debug("spp_getpage %p\n", ptr); |
14a62c34 | 231 | |
1da177e4 | 232 | return ptr; |
14a62c34 | 233 | } |
1da177e4 | 234 | |
f254f390 | 235 | static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr) |
1da177e4 | 236 | { |
458a3e64 TH |
237 | if (pgd_none(*pgd)) { |
238 | pud_t *pud = (pud_t *)spp_getpage(); | |
239 | pgd_populate(&init_mm, pgd, pud); | |
240 | if (pud != pud_offset(pgd, 0)) | |
241 | printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", | |
242 | pud, pud_offset(pgd, 0)); | |
243 | } | |
244 | return pud_offset(pgd, vaddr); | |
245 | } | |
1da177e4 | 246 | |
f254f390 | 247 | static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr) |
458a3e64 | 248 | { |
1da177e4 | 249 | if (pud_none(*pud)) { |
458a3e64 | 250 | pmd_t *pmd = (pmd_t *) spp_getpage(); |
bb23e403 | 251 | pud_populate(&init_mm, pud, pmd); |
458a3e64 | 252 | if (pmd != pmd_offset(pud, 0)) |
10f22dde | 253 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
458a3e64 | 254 | pmd, pmd_offset(pud, 0)); |
1da177e4 | 255 | } |
458a3e64 TH |
256 | return pmd_offset(pud, vaddr); |
257 | } | |
258 | ||
f254f390 | 259 | static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr) |
458a3e64 | 260 | { |
1da177e4 | 261 | if (pmd_none(*pmd)) { |
458a3e64 | 262 | pte_t *pte = (pte_t *) spp_getpage(); |
bb23e403 | 263 | pmd_populate_kernel(&init_mm, pmd, pte); |
458a3e64 | 264 | if (pte != pte_offset_kernel(pmd, 0)) |
10f22dde | 265 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
1da177e4 | 266 | } |
458a3e64 TH |
267 | return pte_offset_kernel(pmd, vaddr); |
268 | } | |
269 | ||
270 | void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) | |
271 | { | |
272 | pud_t *pud; | |
273 | pmd_t *pmd; | |
274 | pte_t *pte; | |
275 | ||
276 | pud = pud_page + pud_index(vaddr); | |
277 | pmd = fill_pmd(pud, vaddr); | |
278 | pte = fill_pte(pmd, vaddr); | |
1da177e4 | 279 | |
1da177e4 LT |
280 | set_pte(pte, new_pte); |
281 | ||
282 | /* | |
283 | * It's enough to flush this one mapping. | |
284 | * (PGE mappings get flushed as well) | |
285 | */ | |
286 | __flush_tlb_one(vaddr); | |
287 | } | |
288 | ||
458a3e64 | 289 | void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
0814e0ba EH |
290 | { |
291 | pgd_t *pgd; | |
292 | pud_t *pud_page; | |
293 | ||
294 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); | |
295 | ||
296 | pgd = pgd_offset_k(vaddr); | |
297 | if (pgd_none(*pgd)) { | |
298 | printk(KERN_ERR | |
299 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
300 | return; | |
301 | } | |
302 | pud_page = (pud_t*)pgd_page_vaddr(*pgd); | |
303 | set_pte_vaddr_pud(pud_page, vaddr, pteval); | |
304 | } | |
305 | ||
458a3e64 | 306 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
307 | { |
308 | pgd_t *pgd; | |
309 | pud_t *pud; | |
310 | ||
311 | pgd = pgd_offset_k(vaddr); | |
458a3e64 TH |
312 | pud = fill_pud(pgd, vaddr); |
313 | return fill_pmd(pud, vaddr); | |
314 | } | |
315 | ||
316 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
317 | { | |
318 | pmd_t *pmd; | |
11124411 | 319 | |
458a3e64 TH |
320 | pmd = populate_extra_pmd(vaddr); |
321 | return fill_pte(pmd, vaddr); | |
11124411 TH |
322 | } |
323 | ||
3a9e189d JS |
324 | /* |
325 | * Create large page table mappings for a range of physical addresses. | |
326 | */ | |
327 | static void __init __init_extra_mapping(unsigned long phys, unsigned long size, | |
2df58b6d | 328 | enum page_cache_mode cache) |
3a9e189d JS |
329 | { |
330 | pgd_t *pgd; | |
331 | pud_t *pud; | |
332 | pmd_t *pmd; | |
2df58b6d | 333 | pgprot_t prot; |
3a9e189d | 334 | |
2df58b6d JG |
335 | pgprot_val(prot) = pgprot_val(PAGE_KERNEL_LARGE) | |
336 | pgprot_val(pgprot_4k_2_large(cachemode2pgprot(cache))); | |
3a9e189d JS |
337 | BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); |
338 | for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { | |
339 | pgd = pgd_offset_k((unsigned long)__va(phys)); | |
340 | if (pgd_none(*pgd)) { | |
341 | pud = (pud_t *) spp_getpage(); | |
342 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | | |
343 | _PAGE_USER)); | |
344 | } | |
345 | pud = pud_offset(pgd, (unsigned long)__va(phys)); | |
346 | if (pud_none(*pud)) { | |
347 | pmd = (pmd_t *) spp_getpage(); | |
348 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | | |
349 | _PAGE_USER)); | |
350 | } | |
351 | pmd = pmd_offset(pud, phys); | |
352 | BUG_ON(!pmd_none(*pmd)); | |
353 | set_pmd(pmd, __pmd(phys | pgprot_val(prot))); | |
354 | } | |
355 | } | |
356 | ||
357 | void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) | |
358 | { | |
2df58b6d | 359 | __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_WB); |
3a9e189d JS |
360 | } |
361 | ||
362 | void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) | |
363 | { | |
2df58b6d | 364 | __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_UC); |
3a9e189d JS |
365 | } |
366 | ||
31eedd82 | 367 | /* |
88f3aec7 IM |
368 | * The head.S code sets up the kernel high mapping: |
369 | * | |
370 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) | |
31eedd82 | 371 | * |
1e3b3081 | 372 | * phys_base holds the negative offset to the kernel, which is added |
31eedd82 TG |
373 | * to the compile time generated pmds. This results in invalid pmds up |
374 | * to the point where we hit the physaddr 0 mapping. | |
375 | * | |
e5f15b45 YL |
376 | * We limit the mappings to the region from _text to _brk_end. _brk_end |
377 | * is rounded up to the 2MB boundary. This catches the invalid pmds as | |
31eedd82 TG |
378 | * well, as they are located before _text: |
379 | */ | |
380 | void __init cleanup_highmap(void) | |
381 | { | |
382 | unsigned long vaddr = __START_KERNEL_map; | |
10054230 | 383 | unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE; |
e5f15b45 | 384 | unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1; |
31eedd82 | 385 | pmd_t *pmd = level2_kernel_pgt; |
31eedd82 | 386 | |
10054230 YL |
387 | /* |
388 | * Native path, max_pfn_mapped is not set yet. | |
389 | * Xen has valid max_pfn_mapped set in | |
390 | * arch/x86/xen/mmu.c:xen_setup_kernel_pagetable(). | |
391 | */ | |
392 | if (max_pfn_mapped) | |
393 | vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT); | |
394 | ||
e5f15b45 | 395 | for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) { |
2884f110 | 396 | if (pmd_none(*pmd)) |
31eedd82 TG |
397 | continue; |
398 | if (vaddr < (unsigned long) _text || vaddr > end) | |
399 | set_pmd(pmd, __pmd(0)); | |
400 | } | |
401 | } | |
402 | ||
7b16eb89 | 403 | static unsigned long __meminit |
b27a43c1 SS |
404 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
405 | pgprot_t prot) | |
4f9c11dd | 406 | { |
eceb3632 | 407 | unsigned long pages = 0, next; |
7b16eb89 | 408 | unsigned long last_map_addr = end; |
4f9c11dd | 409 | int i; |
7b16eb89 | 410 | |
4f9c11dd JF |
411 | pte_t *pte = pte_page + pte_index(addr); |
412 | ||
eceb3632 YL |
413 | for (i = pte_index(addr); i < PTRS_PER_PTE; i++, addr = next, pte++) { |
414 | next = (addr & PAGE_MASK) + PAGE_SIZE; | |
4f9c11dd | 415 | if (addr >= end) { |
eceb3632 YL |
416 | if (!after_bootmem && |
417 | !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) && | |
418 | !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN)) | |
419 | set_pte(pte, __pte(0)); | |
420 | continue; | |
4f9c11dd JF |
421 | } |
422 | ||
b27a43c1 SS |
423 | /* |
424 | * We will re-use the existing mapping. | |
425 | * Xen for example has some special requirements, like mapping | |
426 | * pagetable pages as RO. So assume someone who pre-setup | |
427 | * these mappings are more intelligent. | |
428 | */ | |
3afa3949 | 429 | if (pte_val(*pte)) { |
876ee61a JB |
430 | if (!after_bootmem) |
431 | pages++; | |
4f9c11dd | 432 | continue; |
3afa3949 | 433 | } |
4f9c11dd JF |
434 | |
435 | if (0) | |
436 | printk(" pte=%p addr=%lx pte=%016lx\n", | |
437 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); | |
4f9c11dd | 438 | pages++; |
b27a43c1 | 439 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
7b16eb89 | 440 | last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
4f9c11dd | 441 | } |
a2699e47 | 442 | |
4f9c11dd | 443 | update_page_count(PG_LEVEL_4K, pages); |
7b16eb89 YL |
444 | |
445 | return last_map_addr; | |
4f9c11dd JF |
446 | } |
447 | ||
cc615032 | 448 | static unsigned long __meminit |
b50efd2a | 449 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, |
b27a43c1 | 450 | unsigned long page_size_mask, pgprot_t prot) |
44df75e6 | 451 | { |
20167d34 | 452 | unsigned long pages = 0, next; |
7b16eb89 | 453 | unsigned long last_map_addr = end; |
ce0c0e50 | 454 | |
6ad91658 | 455 | int i = pmd_index(address); |
44df75e6 | 456 | |
20167d34 | 457 | for (; i < PTRS_PER_PMD; i++, address = next) { |
6ad91658 | 458 | pmd_t *pmd = pmd_page + pmd_index(address); |
4f9c11dd | 459 | pte_t *pte; |
b27a43c1 | 460 | pgprot_t new_prot = prot; |
44df75e6 | 461 | |
eceb3632 | 462 | next = (address & PMD_MASK) + PMD_SIZE; |
5f51e139 | 463 | if (address >= end) { |
eceb3632 YL |
464 | if (!after_bootmem && |
465 | !e820_any_mapped(address & PMD_MASK, next, E820_RAM) && | |
466 | !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN)) | |
467 | set_pmd(pmd, __pmd(0)); | |
468 | continue; | |
44df75e6 | 469 | } |
6ad91658 | 470 | |
4f9c11dd | 471 | if (pmd_val(*pmd)) { |
8ae3a5a8 JB |
472 | if (!pmd_large(*pmd)) { |
473 | spin_lock(&init_mm.page_table_lock); | |
973dc4f3 | 474 | pte = (pte_t *)pmd_page_vaddr(*pmd); |
4b239f45 | 475 | last_map_addr = phys_pte_init(pte, address, |
b27a43c1 | 476 | end, prot); |
8ae3a5a8 | 477 | spin_unlock(&init_mm.page_table_lock); |
a2699e47 | 478 | continue; |
8ae3a5a8 | 479 | } |
b27a43c1 SS |
480 | /* |
481 | * If we are ok with PG_LEVEL_2M mapping, then we will | |
482 | * use the existing mapping, | |
483 | * | |
484 | * Otherwise, we will split the large page mapping but | |
485 | * use the same existing protection bits except for | |
486 | * large page, so that we don't violate Intel's TLB | |
487 | * Application note (317080) which says, while changing | |
488 | * the page sizes, new and old translations should | |
489 | * not differ with respect to page frame and | |
490 | * attributes. | |
491 | */ | |
3afa3949 | 492 | if (page_size_mask & (1 << PG_LEVEL_2M)) { |
876ee61a JB |
493 | if (!after_bootmem) |
494 | pages++; | |
20167d34 | 495 | last_map_addr = next; |
b27a43c1 | 496 | continue; |
3afa3949 | 497 | } |
b27a43c1 | 498 | new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
4f9c11dd JF |
499 | } |
500 | ||
b50efd2a | 501 | if (page_size_mask & (1<<PG_LEVEL_2M)) { |
4f9c11dd | 502 | pages++; |
8ae3a5a8 | 503 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 504 | set_pte((pte_t *)pmd, |
960ddb4f | 505 | pfn_pte((address & PMD_MASK) >> PAGE_SHIFT, |
b27a43c1 | 506 | __pgprot(pgprot_val(prot) | _PAGE_PSE))); |
8ae3a5a8 | 507 | spin_unlock(&init_mm.page_table_lock); |
20167d34 | 508 | last_map_addr = next; |
6ad91658 | 509 | continue; |
4f9c11dd | 510 | } |
6ad91658 | 511 | |
868bf4d6 | 512 | pte = alloc_low_page(); |
b27a43c1 | 513 | last_map_addr = phys_pte_init(pte, address, end, new_prot); |
4f9c11dd | 514 | |
8ae3a5a8 | 515 | spin_lock(&init_mm.page_table_lock); |
868bf4d6 | 516 | pmd_populate_kernel(&init_mm, pmd, pte); |
8ae3a5a8 | 517 | spin_unlock(&init_mm.page_table_lock); |
44df75e6 | 518 | } |
ce0c0e50 | 519 | update_page_count(PG_LEVEL_2M, pages); |
7b16eb89 | 520 | return last_map_addr; |
44df75e6 MT |
521 | } |
522 | ||
cc615032 | 523 | static unsigned long __meminit |
b50efd2a YL |
524 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
525 | unsigned long page_size_mask) | |
14a62c34 | 526 | { |
20167d34 | 527 | unsigned long pages = 0, next; |
cc615032 | 528 | unsigned long last_map_addr = end; |
6ad91658 | 529 | int i = pud_index(addr); |
44df75e6 | 530 | |
20167d34 | 531 | for (; i < PTRS_PER_PUD; i++, addr = next) { |
6ad91658 | 532 | pud_t *pud = pud_page + pud_index(addr); |
1da177e4 | 533 | pmd_t *pmd; |
b27a43c1 | 534 | pgprot_t prot = PAGE_KERNEL; |
1da177e4 | 535 | |
20167d34 | 536 | next = (addr & PUD_MASK) + PUD_SIZE; |
eceb3632 YL |
537 | if (addr >= end) { |
538 | if (!after_bootmem && | |
539 | !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) && | |
540 | !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN)) | |
541 | set_pud(pud, __pud(0)); | |
1da177e4 | 542 | continue; |
14a62c34 | 543 | } |
1da177e4 | 544 | |
6ad91658 | 545 | if (pud_val(*pud)) { |
a2699e47 | 546 | if (!pud_large(*pud)) { |
973dc4f3 | 547 | pmd = pmd_offset(pud, 0); |
4b239f45 | 548 | last_map_addr = phys_pmd_init(pmd, addr, end, |
b27a43c1 | 549 | page_size_mask, prot); |
4b239f45 | 550 | __flush_tlb_all(); |
a2699e47 SS |
551 | continue; |
552 | } | |
b27a43c1 SS |
553 | /* |
554 | * If we are ok with PG_LEVEL_1G mapping, then we will | |
555 | * use the existing mapping. | |
556 | * | |
557 | * Otherwise, we will split the gbpage mapping but use | |
558 | * the same existing protection bits except for large | |
559 | * page, so that we don't violate Intel's TLB | |
560 | * Application note (317080) which says, while changing | |
561 | * the page sizes, new and old translations should | |
562 | * not differ with respect to page frame and | |
563 | * attributes. | |
564 | */ | |
3afa3949 | 565 | if (page_size_mask & (1 << PG_LEVEL_1G)) { |
876ee61a JB |
566 | if (!after_bootmem) |
567 | pages++; | |
20167d34 | 568 | last_map_addr = next; |
b27a43c1 | 569 | continue; |
3afa3949 | 570 | } |
b27a43c1 | 571 | prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
ef925766 AK |
572 | } |
573 | ||
b50efd2a | 574 | if (page_size_mask & (1<<PG_LEVEL_1G)) { |
ce0c0e50 | 575 | pages++; |
8ae3a5a8 | 576 | spin_lock(&init_mm.page_table_lock); |
ef925766 | 577 | set_pte((pte_t *)pud, |
960ddb4f YL |
578 | pfn_pte((addr & PUD_MASK) >> PAGE_SHIFT, |
579 | PAGE_KERNEL_LARGE)); | |
8ae3a5a8 | 580 | spin_unlock(&init_mm.page_table_lock); |
20167d34 | 581 | last_map_addr = next; |
6ad91658 KM |
582 | continue; |
583 | } | |
584 | ||
868bf4d6 | 585 | pmd = alloc_low_page(); |
b27a43c1 SS |
586 | last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
587 | prot); | |
8ae3a5a8 JB |
588 | |
589 | spin_lock(&init_mm.page_table_lock); | |
868bf4d6 | 590 | pud_populate(&init_mm, pud, pmd); |
44df75e6 | 591 | spin_unlock(&init_mm.page_table_lock); |
1da177e4 | 592 | } |
1a2b4412 | 593 | __flush_tlb_all(); |
a2699e47 | 594 | |
ce0c0e50 | 595 | update_page_count(PG_LEVEL_1G, pages); |
cc615032 | 596 | |
1a0db38e | 597 | return last_map_addr; |
14a62c34 | 598 | } |
1da177e4 | 599 | |
41d840e2 | 600 | unsigned long __meminit |
f765090a PE |
601 | kernel_physical_mapping_init(unsigned long start, |
602 | unsigned long end, | |
603 | unsigned long page_size_mask) | |
14a62c34 | 604 | { |
9b861528 | 605 | bool pgd_changed = false; |
b50efd2a | 606 | unsigned long next, last_map_addr = end; |
9b861528 | 607 | unsigned long addr; |
1da177e4 LT |
608 | |
609 | start = (unsigned long)__va(start); | |
610 | end = (unsigned long)__va(end); | |
1c5f50ee | 611 | addr = start; |
1da177e4 LT |
612 | |
613 | for (; start < end; start = next) { | |
44df75e6 MT |
614 | pgd_t *pgd = pgd_offset_k(start); |
615 | pud_t *pud; | |
616 | ||
c2bdee59 | 617 | next = (start & PGDIR_MASK) + PGDIR_SIZE; |
4f9c11dd JF |
618 | |
619 | if (pgd_val(*pgd)) { | |
973dc4f3 | 620 | pud = (pud_t *)pgd_page_vaddr(*pgd); |
4b239f45 | 621 | last_map_addr = phys_pud_init(pud, __pa(start), |
b50efd2a | 622 | __pa(end), page_size_mask); |
4f9c11dd JF |
623 | continue; |
624 | } | |
625 | ||
868bf4d6 | 626 | pud = alloc_low_page(); |
c2bdee59 | 627 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(end), |
b50efd2a | 628 | page_size_mask); |
8ae3a5a8 JB |
629 | |
630 | spin_lock(&init_mm.page_table_lock); | |
868bf4d6 | 631 | pgd_populate(&init_mm, pgd, pud); |
8ae3a5a8 | 632 | spin_unlock(&init_mm.page_table_lock); |
9b861528 | 633 | pgd_changed = true; |
14a62c34 | 634 | } |
9b861528 HL |
635 | |
636 | if (pgd_changed) | |
9661d5bc | 637 | sync_global_pgds(addr, end - 1, 0); |
9b861528 | 638 | |
a2699e47 | 639 | __flush_tlb_all(); |
1da177e4 | 640 | |
b50efd2a YL |
641 | return last_map_addr; |
642 | } | |
7b16eb89 | 643 | |
2b97690f | 644 | #ifndef CONFIG_NUMA |
d8fc3afc | 645 | void __init initmem_init(void) |
1f75d7e3 | 646 | { |
e7e8de59 | 647 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0); |
1f75d7e3 | 648 | } |
3551f88f | 649 | #endif |
1f75d7e3 | 650 | |
1da177e4 LT |
651 | void __init paging_init(void) |
652 | { | |
3551f88f | 653 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
44df75e6 | 654 | sparse_init(); |
44b57280 YL |
655 | |
656 | /* | |
657 | * clear the default setting with node 0 | |
658 | * note: don't use nodes_clear here, that is really clearing when | |
659 | * numa support is not compiled in, and later node_set_state | |
660 | * will not set it back. | |
661 | */ | |
4b0ef1fe LJ |
662 | node_clear_state(0, N_MEMORY); |
663 | if (N_MEMORY != N_NORMAL_MEMORY) | |
664 | node_clear_state(0, N_NORMAL_MEMORY); | |
44b57280 | 665 | |
4c0b2e5f | 666 | zone_sizes_init(); |
1da177e4 | 667 | } |
1da177e4 | 668 | |
44df75e6 MT |
669 | /* |
670 | * Memory hotplug specific functions | |
44df75e6 | 671 | */ |
bc02af93 | 672 | #ifdef CONFIG_MEMORY_HOTPLUG |
ea085417 SZ |
673 | /* |
674 | * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need | |
675 | * updating. | |
676 | */ | |
677 | static void update_end_of_memory_vars(u64 start, u64 size) | |
678 | { | |
679 | unsigned long end_pfn = PFN_UP(start + size); | |
680 | ||
681 | if (end_pfn > max_pfn) { | |
682 | max_pfn = end_pfn; | |
683 | max_low_pfn = end_pfn; | |
684 | high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; | |
685 | } | |
686 | } | |
687 | ||
9d99aaa3 AK |
688 | /* |
689 | * Memory is added always to NORMAL zone. This means you will never get | |
690 | * additional DMA/DMA32 memory. | |
691 | */ | |
033fbae9 | 692 | int arch_add_memory(int nid, u64 start, u64 size, bool for_device) |
44df75e6 | 693 | { |
bc02af93 | 694 | struct pglist_data *pgdat = NODE_DATA(nid); |
9bfc4113 | 695 | struct zone *zone = pgdat->node_zones + |
033fbae9 | 696 | zone_for_memory(nid, start, size, ZONE_NORMAL, for_device); |
66520ebc | 697 | unsigned long start_pfn = start >> PAGE_SHIFT; |
44df75e6 MT |
698 | unsigned long nr_pages = size >> PAGE_SHIFT; |
699 | int ret; | |
700 | ||
66520ebc | 701 | init_memory_mapping(start, start + size); |
45e0b78b | 702 | |
c04fc586 | 703 | ret = __add_pages(nid, zone, start_pfn, nr_pages); |
fe8b868e | 704 | WARN_ON_ONCE(ret); |
44df75e6 | 705 | |
ea085417 SZ |
706 | /* update max_pfn, max_low_pfn and high_memory */ |
707 | update_end_of_memory_vars(start, size); | |
708 | ||
44df75e6 | 709 | return ret; |
44df75e6 | 710 | } |
bc02af93 | 711 | EXPORT_SYMBOL_GPL(arch_add_memory); |
44df75e6 | 712 | |
ae9aae9e WC |
713 | #define PAGE_INUSE 0xFD |
714 | ||
715 | static void __meminit free_pagetable(struct page *page, int order) | |
716 | { | |
ae9aae9e WC |
717 | unsigned long magic; |
718 | unsigned int nr_pages = 1 << order; | |
4b94ffdc DW |
719 | struct vmem_altmap *altmap = to_vmem_altmap((unsigned long) page); |
720 | ||
721 | if (altmap) { | |
722 | vmem_altmap_free(altmap, nr_pages); | |
723 | return; | |
724 | } | |
ae9aae9e WC |
725 | |
726 | /* bootmem page has reserved flag */ | |
727 | if (PageReserved(page)) { | |
728 | __ClearPageReserved(page); | |
ae9aae9e WC |
729 | |
730 | magic = (unsigned long)page->lru.next; | |
731 | if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) { | |
732 | while (nr_pages--) | |
733 | put_page_bootmem(page++); | |
734 | } else | |
170a5a7e JL |
735 | while (nr_pages--) |
736 | free_reserved_page(page++); | |
ae9aae9e WC |
737 | } else |
738 | free_pages((unsigned long)page_address(page), order); | |
ae9aae9e WC |
739 | } |
740 | ||
741 | static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd) | |
742 | { | |
743 | pte_t *pte; | |
744 | int i; | |
745 | ||
746 | for (i = 0; i < PTRS_PER_PTE; i++) { | |
747 | pte = pte_start + i; | |
748 | if (pte_val(*pte)) | |
749 | return; | |
750 | } | |
751 | ||
752 | /* free a pte talbe */ | |
753 | free_pagetable(pmd_page(*pmd), 0); | |
754 | spin_lock(&init_mm.page_table_lock); | |
755 | pmd_clear(pmd); | |
756 | spin_unlock(&init_mm.page_table_lock); | |
757 | } | |
758 | ||
759 | static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud) | |
760 | { | |
761 | pmd_t *pmd; | |
762 | int i; | |
763 | ||
764 | for (i = 0; i < PTRS_PER_PMD; i++) { | |
765 | pmd = pmd_start + i; | |
766 | if (pmd_val(*pmd)) | |
767 | return; | |
768 | } | |
769 | ||
770 | /* free a pmd talbe */ | |
771 | free_pagetable(pud_page(*pud), 0); | |
772 | spin_lock(&init_mm.page_table_lock); | |
773 | pud_clear(pud); | |
774 | spin_unlock(&init_mm.page_table_lock); | |
775 | } | |
776 | ||
777 | /* Return true if pgd is changed, otherwise return false. */ | |
778 | static bool __meminit free_pud_table(pud_t *pud_start, pgd_t *pgd) | |
779 | { | |
780 | pud_t *pud; | |
781 | int i; | |
782 | ||
783 | for (i = 0; i < PTRS_PER_PUD; i++) { | |
784 | pud = pud_start + i; | |
785 | if (pud_val(*pud)) | |
786 | return false; | |
787 | } | |
788 | ||
789 | /* free a pud table */ | |
790 | free_pagetable(pgd_page(*pgd), 0); | |
791 | spin_lock(&init_mm.page_table_lock); | |
792 | pgd_clear(pgd); | |
793 | spin_unlock(&init_mm.page_table_lock); | |
794 | ||
795 | return true; | |
796 | } | |
797 | ||
798 | static void __meminit | |
799 | remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end, | |
800 | bool direct) | |
801 | { | |
802 | unsigned long next, pages = 0; | |
803 | pte_t *pte; | |
804 | void *page_addr; | |
805 | phys_addr_t phys_addr; | |
806 | ||
807 | pte = pte_start + pte_index(addr); | |
808 | for (; addr < end; addr = next, pte++) { | |
809 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
810 | if (next > end) | |
811 | next = end; | |
812 | ||
813 | if (!pte_present(*pte)) | |
814 | continue; | |
815 | ||
816 | /* | |
817 | * We mapped [0,1G) memory as identity mapping when | |
818 | * initializing, in arch/x86/kernel/head_64.S. These | |
819 | * pagetables cannot be removed. | |
820 | */ | |
821 | phys_addr = pte_val(*pte) + (addr & PAGE_MASK); | |
822 | if (phys_addr < (phys_addr_t)0x40000000) | |
823 | return; | |
824 | ||
b500f77b | 825 | if (PAGE_ALIGNED(addr) && PAGE_ALIGNED(next)) { |
ae9aae9e WC |
826 | /* |
827 | * Do not free direct mapping pages since they were | |
828 | * freed when offlining, or simplely not in use. | |
829 | */ | |
830 | if (!direct) | |
831 | free_pagetable(pte_page(*pte), 0); | |
832 | ||
833 | spin_lock(&init_mm.page_table_lock); | |
834 | pte_clear(&init_mm, addr, pte); | |
835 | spin_unlock(&init_mm.page_table_lock); | |
836 | ||
837 | /* For non-direct mapping, pages means nothing. */ | |
838 | pages++; | |
839 | } else { | |
840 | /* | |
841 | * If we are here, we are freeing vmemmap pages since | |
842 | * direct mapped memory ranges to be freed are aligned. | |
843 | * | |
844 | * If we are not removing the whole page, it means | |
845 | * other page structs in this page are being used and | |
846 | * we canot remove them. So fill the unused page_structs | |
847 | * with 0xFD, and remove the page when it is wholly | |
848 | * filled with 0xFD. | |
849 | */ | |
850 | memset((void *)addr, PAGE_INUSE, next - addr); | |
851 | ||
852 | page_addr = page_address(pte_page(*pte)); | |
853 | if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) { | |
854 | free_pagetable(pte_page(*pte), 0); | |
855 | ||
856 | spin_lock(&init_mm.page_table_lock); | |
857 | pte_clear(&init_mm, addr, pte); | |
858 | spin_unlock(&init_mm.page_table_lock); | |
859 | } | |
860 | } | |
861 | } | |
862 | ||
863 | /* Call free_pte_table() in remove_pmd_table(). */ | |
864 | flush_tlb_all(); | |
865 | if (direct) | |
866 | update_page_count(PG_LEVEL_4K, -pages); | |
867 | } | |
868 | ||
869 | static void __meminit | |
870 | remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end, | |
871 | bool direct) | |
872 | { | |
873 | unsigned long next, pages = 0; | |
874 | pte_t *pte_base; | |
875 | pmd_t *pmd; | |
876 | void *page_addr; | |
877 | ||
878 | pmd = pmd_start + pmd_index(addr); | |
879 | for (; addr < end; addr = next, pmd++) { | |
880 | next = pmd_addr_end(addr, end); | |
881 | ||
882 | if (!pmd_present(*pmd)) | |
883 | continue; | |
884 | ||
885 | if (pmd_large(*pmd)) { | |
886 | if (IS_ALIGNED(addr, PMD_SIZE) && | |
887 | IS_ALIGNED(next, PMD_SIZE)) { | |
888 | if (!direct) | |
889 | free_pagetable(pmd_page(*pmd), | |
890 | get_order(PMD_SIZE)); | |
891 | ||
892 | spin_lock(&init_mm.page_table_lock); | |
893 | pmd_clear(pmd); | |
894 | spin_unlock(&init_mm.page_table_lock); | |
895 | pages++; | |
896 | } else { | |
897 | /* If here, we are freeing vmemmap pages. */ | |
898 | memset((void *)addr, PAGE_INUSE, next - addr); | |
899 | ||
900 | page_addr = page_address(pmd_page(*pmd)); | |
901 | if (!memchr_inv(page_addr, PAGE_INUSE, | |
902 | PMD_SIZE)) { | |
903 | free_pagetable(pmd_page(*pmd), | |
904 | get_order(PMD_SIZE)); | |
905 | ||
906 | spin_lock(&init_mm.page_table_lock); | |
907 | pmd_clear(pmd); | |
908 | spin_unlock(&init_mm.page_table_lock); | |
909 | } | |
910 | } | |
911 | ||
912 | continue; | |
913 | } | |
914 | ||
915 | pte_base = (pte_t *)pmd_page_vaddr(*pmd); | |
916 | remove_pte_table(pte_base, addr, next, direct); | |
917 | free_pte_table(pte_base, pmd); | |
918 | } | |
919 | ||
920 | /* Call free_pmd_table() in remove_pud_table(). */ | |
921 | if (direct) | |
922 | update_page_count(PG_LEVEL_2M, -pages); | |
923 | } | |
924 | ||
925 | static void __meminit | |
926 | remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end, | |
927 | bool direct) | |
928 | { | |
929 | unsigned long next, pages = 0; | |
930 | pmd_t *pmd_base; | |
931 | pud_t *pud; | |
932 | void *page_addr; | |
933 | ||
934 | pud = pud_start + pud_index(addr); | |
935 | for (; addr < end; addr = next, pud++) { | |
936 | next = pud_addr_end(addr, end); | |
937 | ||
938 | if (!pud_present(*pud)) | |
939 | continue; | |
940 | ||
941 | if (pud_large(*pud)) { | |
942 | if (IS_ALIGNED(addr, PUD_SIZE) && | |
943 | IS_ALIGNED(next, PUD_SIZE)) { | |
944 | if (!direct) | |
945 | free_pagetable(pud_page(*pud), | |
946 | get_order(PUD_SIZE)); | |
947 | ||
948 | spin_lock(&init_mm.page_table_lock); | |
949 | pud_clear(pud); | |
950 | spin_unlock(&init_mm.page_table_lock); | |
951 | pages++; | |
952 | } else { | |
953 | /* If here, we are freeing vmemmap pages. */ | |
954 | memset((void *)addr, PAGE_INUSE, next - addr); | |
955 | ||
956 | page_addr = page_address(pud_page(*pud)); | |
957 | if (!memchr_inv(page_addr, PAGE_INUSE, | |
958 | PUD_SIZE)) { | |
959 | free_pagetable(pud_page(*pud), | |
960 | get_order(PUD_SIZE)); | |
961 | ||
962 | spin_lock(&init_mm.page_table_lock); | |
963 | pud_clear(pud); | |
964 | spin_unlock(&init_mm.page_table_lock); | |
965 | } | |
966 | } | |
967 | ||
968 | continue; | |
969 | } | |
970 | ||
971 | pmd_base = (pmd_t *)pud_page_vaddr(*pud); | |
972 | remove_pmd_table(pmd_base, addr, next, direct); | |
973 | free_pmd_table(pmd_base, pud); | |
974 | } | |
975 | ||
976 | if (direct) | |
977 | update_page_count(PG_LEVEL_1G, -pages); | |
978 | } | |
979 | ||
980 | /* start and end are both virtual address. */ | |
981 | static void __meminit | |
982 | remove_pagetable(unsigned long start, unsigned long end, bool direct) | |
983 | { | |
984 | unsigned long next; | |
5255e0a7 | 985 | unsigned long addr; |
ae9aae9e WC |
986 | pgd_t *pgd; |
987 | pud_t *pud; | |
988 | bool pgd_changed = false; | |
989 | ||
5255e0a7 YI |
990 | for (addr = start; addr < end; addr = next) { |
991 | next = pgd_addr_end(addr, end); | |
ae9aae9e | 992 | |
5255e0a7 | 993 | pgd = pgd_offset_k(addr); |
ae9aae9e WC |
994 | if (!pgd_present(*pgd)) |
995 | continue; | |
996 | ||
997 | pud = (pud_t *)pgd_page_vaddr(*pgd); | |
5255e0a7 | 998 | remove_pud_table(pud, addr, next, direct); |
ae9aae9e WC |
999 | if (free_pud_table(pud, pgd)) |
1000 | pgd_changed = true; | |
1001 | } | |
1002 | ||
1003 | if (pgd_changed) | |
9661d5bc | 1004 | sync_global_pgds(start, end - 1, 1); |
ae9aae9e WC |
1005 | |
1006 | flush_tlb_all(); | |
1007 | } | |
1008 | ||
0aad818b | 1009 | void __ref vmemmap_free(unsigned long start, unsigned long end) |
0197518c | 1010 | { |
0197518c TC |
1011 | remove_pagetable(start, end, false); |
1012 | } | |
1013 | ||
587ff8c4 | 1014 | #ifdef CONFIG_MEMORY_HOTREMOVE |
bbcab878 TC |
1015 | static void __meminit |
1016 | kernel_physical_mapping_remove(unsigned long start, unsigned long end) | |
1017 | { | |
1018 | start = (unsigned long)__va(start); | |
1019 | end = (unsigned long)__va(end); | |
1020 | ||
1021 | remove_pagetable(start, end, true); | |
1022 | } | |
1023 | ||
24d335ca WC |
1024 | int __ref arch_remove_memory(u64 start, u64 size) |
1025 | { | |
1026 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1027 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
4b94ffdc DW |
1028 | struct page *page = pfn_to_page(start_pfn); |
1029 | struct vmem_altmap *altmap; | |
24d335ca WC |
1030 | struct zone *zone; |
1031 | int ret; | |
1032 | ||
4b94ffdc DW |
1033 | /* With altmap the first mapped page is offset from @start */ |
1034 | altmap = to_vmem_altmap((unsigned long) page); | |
1035 | if (altmap) | |
1036 | page += vmem_altmap_offset(altmap); | |
1037 | zone = page_zone(page); | |
24d335ca WC |
1038 | ret = __remove_pages(zone, start_pfn, nr_pages); |
1039 | WARN_ON_ONCE(ret); | |
4b94ffdc | 1040 | kernel_physical_mapping_remove(start, start + size); |
24d335ca WC |
1041 | |
1042 | return ret; | |
1043 | } | |
1044 | #endif | |
45e0b78b KM |
1045 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
1046 | ||
81ac3ad9 | 1047 | static struct kcore_list kcore_vsyscall; |
1da177e4 | 1048 | |
94b43c3d YL |
1049 | static void __init register_page_bootmem_info(void) |
1050 | { | |
1051 | #ifdef CONFIG_NUMA | |
1052 | int i; | |
1053 | ||
1054 | for_each_online_node(i) | |
1055 | register_page_bootmem_info_node(NODE_DATA(i)); | |
1056 | #endif | |
1057 | } | |
1058 | ||
1da177e4 LT |
1059 | void __init mem_init(void) |
1060 | { | |
0dc243ae | 1061 | pci_iommu_alloc(); |
1da177e4 | 1062 | |
48ddb154 | 1063 | /* clear_bss() already clear the empty_zero_page */ |
1da177e4 | 1064 | |
94b43c3d | 1065 | register_page_bootmem_info(); |
bced0e32 JL |
1066 | |
1067 | /* this will put all memory onto the freelists */ | |
0c988534 | 1068 | free_all_bootmem(); |
1da177e4 LT |
1069 | after_bootmem = 1; |
1070 | ||
1da177e4 | 1071 | /* Register memory areas for /proc/kcore */ |
f40c3300 AL |
1072 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, |
1073 | PAGE_SIZE, KCORE_OTHER); | |
1da177e4 | 1074 | |
46a84132 | 1075 | mem_init_print_info(NULL); |
1da177e4 LT |
1076 | } |
1077 | ||
edeed305 AV |
1078 | const int rodata_test_data = 0xC3; |
1079 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
67df197b | 1080 | |
502f6604 | 1081 | int kernel_set_to_readonly; |
16239630 SR |
1082 | |
1083 | void set_kernel_text_rw(void) | |
1084 | { | |
b9af7c0d | 1085 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 1086 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
1087 | |
1088 | if (!kernel_set_to_readonly) | |
1089 | return; | |
1090 | ||
1091 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
1092 | start, end); | |
1093 | ||
e7d23dde SS |
1094 | /* |
1095 | * Make the kernel identity mapping for text RW. Kernel text | |
1096 | * mapping will always be RO. Refer to the comment in | |
1097 | * static_protections() in pageattr.c | |
1098 | */ | |
16239630 SR |
1099 | set_memory_rw(start, (end - start) >> PAGE_SHIFT); |
1100 | } | |
1101 | ||
1102 | void set_kernel_text_ro(void) | |
1103 | { | |
b9af7c0d | 1104 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 1105 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
1106 | |
1107 | if (!kernel_set_to_readonly) | |
1108 | return; | |
1109 | ||
1110 | pr_debug("Set kernel text: %lx - %lx for read only\n", | |
1111 | start, end); | |
1112 | ||
e7d23dde SS |
1113 | /* |
1114 | * Set the kernel identity mapping for text RO. | |
1115 | */ | |
16239630 SR |
1116 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1117 | } | |
1118 | ||
67df197b AV |
1119 | void mark_rodata_ro(void) |
1120 | { | |
74e08179 | 1121 | unsigned long start = PFN_ALIGN(_text); |
fc8d7826 | 1122 | unsigned long rodata_start = PFN_ALIGN(__start_rodata); |
74e08179 | 1123 | unsigned long end = (unsigned long) &__end_rodata_hpage_align; |
fc8d7826 AD |
1124 | unsigned long text_end = PFN_ALIGN(&__stop___ex_table); |
1125 | unsigned long rodata_end = PFN_ALIGN(&__end_rodata); | |
45e2a9d4 | 1126 | unsigned long all_end; |
8f0f996e | 1127 | |
6fb14755 | 1128 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
e3ebadd9 | 1129 | (end - start) >> 10); |
984bb80d AV |
1130 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1131 | ||
16239630 SR |
1132 | kernel_set_to_readonly = 1; |
1133 | ||
984bb80d | 1134 | /* |
72212675 YL |
1135 | * The rodata/data/bss/brk section (but not the kernel text!) |
1136 | * should also be not-executable. | |
45e2a9d4 KC |
1137 | * |
1138 | * We align all_end to PMD_SIZE because the existing mapping | |
1139 | * is a full PMD. If we would align _brk_end to PAGE_SIZE we | |
1140 | * split the PMD and the reminder between _brk_end and the end | |
1141 | * of the PMD will remain mapped executable. | |
1142 | * | |
1143 | * Any PMD which was setup after the one which covers _brk_end | |
1144 | * has been zapped already via cleanup_highmem(). | |
984bb80d | 1145 | */ |
45e2a9d4 | 1146 | all_end = roundup((unsigned long)_brk_end, PMD_SIZE); |
ab76f7b4 | 1147 | set_memory_nx(text_end, (all_end - text_end) >> PAGE_SHIFT); |
67df197b | 1148 | |
1a487252 AV |
1149 | rodata_test(); |
1150 | ||
0c42f392 | 1151 | #ifdef CONFIG_CPA_DEBUG |
10f22dde | 1152 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
6d238cc4 | 1153 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1154 | |
10f22dde | 1155 | printk(KERN_INFO "Testing CPA: again\n"); |
6d238cc4 | 1156 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1157 | #endif |
74e08179 | 1158 | |
c88442ec | 1159 | free_init_pages("unused kernel", |
fc8d7826 AD |
1160 | (unsigned long) __va(__pa_symbol(text_end)), |
1161 | (unsigned long) __va(__pa_symbol(rodata_start))); | |
c88442ec | 1162 | free_init_pages("unused kernel", |
fc8d7826 AD |
1163 | (unsigned long) __va(__pa_symbol(rodata_end)), |
1164 | (unsigned long) __va(__pa_symbol(_sdata))); | |
e1a58320 SS |
1165 | |
1166 | debug_checkwx(); | |
67df197b | 1167 | } |
4e4eee0e | 1168 | |
14a62c34 TG |
1169 | int kern_addr_valid(unsigned long addr) |
1170 | { | |
1da177e4 | 1171 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
14a62c34 TG |
1172 | pgd_t *pgd; |
1173 | pud_t *pud; | |
1174 | pmd_t *pmd; | |
1175 | pte_t *pte; | |
1da177e4 LT |
1176 | |
1177 | if (above != 0 && above != -1UL) | |
14a62c34 TG |
1178 | return 0; |
1179 | ||
1da177e4 LT |
1180 | pgd = pgd_offset_k(addr); |
1181 | if (pgd_none(*pgd)) | |
1182 | return 0; | |
1183 | ||
1184 | pud = pud_offset(pgd, addr); | |
1185 | if (pud_none(*pud)) | |
14a62c34 | 1186 | return 0; |
1da177e4 | 1187 | |
0ee364eb MG |
1188 | if (pud_large(*pud)) |
1189 | return pfn_valid(pud_pfn(*pud)); | |
1190 | ||
1da177e4 LT |
1191 | pmd = pmd_offset(pud, addr); |
1192 | if (pmd_none(*pmd)) | |
1193 | return 0; | |
14a62c34 | 1194 | |
1da177e4 LT |
1195 | if (pmd_large(*pmd)) |
1196 | return pfn_valid(pmd_pfn(*pmd)); | |
1197 | ||
1198 | pte = pte_offset_kernel(pmd, addr); | |
1199 | if (pte_none(*pte)) | |
1200 | return 0; | |
14a62c34 | 1201 | |
1da177e4 LT |
1202 | return pfn_valid(pte_pfn(*pte)); |
1203 | } | |
1204 | ||
982792c7 | 1205 | static unsigned long probe_memory_block_size(void) |
1dc41aa6 | 1206 | { |
43c75f93 | 1207 | unsigned long bz = MIN_MEMORY_BLOCK_SIZE; |
982792c7 | 1208 | |
43c75f93 SJ |
1209 | /* if system is UV or has 64GB of RAM or more, use large blocks */ |
1210 | if (is_uv_system() || ((max_pfn << PAGE_SHIFT) >= (64UL << 30))) | |
1211 | bz = 2UL << 30; /* 2GB */ | |
982792c7 | 1212 | |
43c75f93 | 1213 | pr_info("x86/mm: Memory block size: %ldMB\n", bz >> 20); |
982792c7 YL |
1214 | |
1215 | return bz; | |
1216 | } | |
1217 | ||
1218 | static unsigned long memory_block_size_probed; | |
1219 | unsigned long memory_block_size_bytes(void) | |
1220 | { | |
1221 | if (!memory_block_size_probed) | |
1222 | memory_block_size_probed = probe_memory_block_size(); | |
1223 | ||
1224 | return memory_block_size_probed; | |
1225 | } | |
1226 | ||
0889eba5 CL |
1227 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
1228 | /* | |
1229 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. | |
1230 | */ | |
c2b91e2e YL |
1231 | static long __meminitdata addr_start, addr_end; |
1232 | static void __meminitdata *p_start, *p_end; | |
1233 | static int __meminitdata node_start; | |
1234 | ||
e8216da5 | 1235 | static int __meminit vmemmap_populate_hugepages(unsigned long start, |
4b94ffdc | 1236 | unsigned long end, int node, struct vmem_altmap *altmap) |
0889eba5 | 1237 | { |
0aad818b | 1238 | unsigned long addr; |
0889eba5 CL |
1239 | unsigned long next; |
1240 | pgd_t *pgd; | |
1241 | pud_t *pud; | |
1242 | pmd_t *pmd; | |
1243 | ||
0aad818b | 1244 | for (addr = start; addr < end; addr = next) { |
e8216da5 | 1245 | next = pmd_addr_end(addr, end); |
0889eba5 CL |
1246 | |
1247 | pgd = vmemmap_pgd_populate(addr, node); | |
1248 | if (!pgd) | |
1249 | return -ENOMEM; | |
14a62c34 | 1250 | |
0889eba5 CL |
1251 | pud = vmemmap_pud_populate(pgd, addr, node); |
1252 | if (!pud) | |
1253 | return -ENOMEM; | |
1254 | ||
e8216da5 JW |
1255 | pmd = pmd_offset(pud, addr); |
1256 | if (pmd_none(*pmd)) { | |
e8216da5 | 1257 | void *p; |
14a62c34 | 1258 | |
4b94ffdc | 1259 | p = __vmemmap_alloc_block_buf(PMD_SIZE, node, altmap); |
8e2cdbcb JW |
1260 | if (p) { |
1261 | pte_t entry; | |
1262 | ||
1263 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, | |
1264 | PAGE_KERNEL_LARGE); | |
1265 | set_pmd(pmd, __pmd(pte_val(entry))); | |
1266 | ||
1267 | /* check to see if we have contiguous blocks */ | |
1268 | if (p_end != p || node_start != node) { | |
1269 | if (p_start) | |
c9cdaeb2 | 1270 | pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
8e2cdbcb JW |
1271 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
1272 | addr_start = addr; | |
1273 | node_start = node; | |
1274 | p_start = p; | |
1275 | } | |
7c934d39 | 1276 | |
8e2cdbcb JW |
1277 | addr_end = addr + PMD_SIZE; |
1278 | p_end = p + PMD_SIZE; | |
1279 | continue; | |
4b94ffdc DW |
1280 | } else if (altmap) |
1281 | return -ENOMEM; /* no fallback */ | |
8e2cdbcb | 1282 | } else if (pmd_large(*pmd)) { |
e8216da5 | 1283 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
8e2cdbcb JW |
1284 | continue; |
1285 | } | |
1286 | pr_warn_once("vmemmap: falling back to regular page backing\n"); | |
1287 | if (vmemmap_populate_basepages(addr, next, node)) | |
1288 | return -ENOMEM; | |
0889eba5 | 1289 | } |
0889eba5 CL |
1290 | return 0; |
1291 | } | |
c2b91e2e | 1292 | |
e8216da5 JW |
1293 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
1294 | { | |
4b94ffdc | 1295 | struct vmem_altmap *altmap = to_vmem_altmap(start); |
e8216da5 JW |
1296 | int err; |
1297 | ||
1298 | if (cpu_has_pse) | |
4b94ffdc DW |
1299 | err = vmemmap_populate_hugepages(start, end, node, altmap); |
1300 | else if (altmap) { | |
1301 | pr_err_once("%s: no cpu support for altmap allocations\n", | |
1302 | __func__); | |
1303 | err = -ENOMEM; | |
1304 | } else | |
e8216da5 JW |
1305 | err = vmemmap_populate_basepages(start, end, node); |
1306 | if (!err) | |
9661d5bc | 1307 | sync_global_pgds(start, end - 1, 0); |
e8216da5 JW |
1308 | return err; |
1309 | } | |
1310 | ||
46723bfa YI |
1311 | #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE) |
1312 | void register_page_bootmem_memmap(unsigned long section_nr, | |
1313 | struct page *start_page, unsigned long size) | |
1314 | { | |
1315 | unsigned long addr = (unsigned long)start_page; | |
1316 | unsigned long end = (unsigned long)(start_page + size); | |
1317 | unsigned long next; | |
1318 | pgd_t *pgd; | |
1319 | pud_t *pud; | |
1320 | pmd_t *pmd; | |
1321 | unsigned int nr_pages; | |
1322 | struct page *page; | |
1323 | ||
1324 | for (; addr < end; addr = next) { | |
1325 | pte_t *pte = NULL; | |
1326 | ||
1327 | pgd = pgd_offset_k(addr); | |
1328 | if (pgd_none(*pgd)) { | |
1329 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1330 | continue; | |
1331 | } | |
1332 | get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO); | |
1333 | ||
1334 | pud = pud_offset(pgd, addr); | |
1335 | if (pud_none(*pud)) { | |
1336 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1337 | continue; | |
1338 | } | |
1339 | get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO); | |
1340 | ||
1341 | if (!cpu_has_pse) { | |
1342 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1343 | pmd = pmd_offset(pud, addr); | |
1344 | if (pmd_none(*pmd)) | |
1345 | continue; | |
1346 | get_page_bootmem(section_nr, pmd_page(*pmd), | |
1347 | MIX_SECTION_INFO); | |
1348 | ||
1349 | pte = pte_offset_kernel(pmd, addr); | |
1350 | if (pte_none(*pte)) | |
1351 | continue; | |
1352 | get_page_bootmem(section_nr, pte_page(*pte), | |
1353 | SECTION_INFO); | |
1354 | } else { | |
1355 | next = pmd_addr_end(addr, end); | |
1356 | ||
1357 | pmd = pmd_offset(pud, addr); | |
1358 | if (pmd_none(*pmd)) | |
1359 | continue; | |
1360 | ||
1361 | nr_pages = 1 << (get_order(PMD_SIZE)); | |
1362 | page = pmd_page(*pmd); | |
1363 | while (nr_pages--) | |
1364 | get_page_bootmem(section_nr, page++, | |
1365 | SECTION_INFO); | |
1366 | } | |
1367 | } | |
1368 | } | |
1369 | #endif | |
1370 | ||
c2b91e2e YL |
1371 | void __meminit vmemmap_populate_print_last(void) |
1372 | { | |
1373 | if (p_start) { | |
c9cdaeb2 | 1374 | pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
c2b91e2e YL |
1375 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
1376 | p_start = NULL; | |
1377 | p_end = NULL; | |
1378 | node_start = 0; | |
1379 | } | |
1380 | } | |
0889eba5 | 1381 | #endif |