Commit | Line | Data |
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14cf11af PM |
1 | /* |
2 | * This file contains ioremap and related functions for 64-bit machines. | |
3 | * | |
4 | * Derived from arch/ppc64/mm/init.c | |
5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
6 | * | |
7 | * Modifications by Paul Mackerras (PowerMac) (paulus@samba.org) | |
8 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
9 | * Copyright (C) 1996 Paul Mackerras | |
14cf11af PM |
10 | * |
11 | * Derived from "arch/i386/mm/init.c" | |
12 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
13 | * | |
14 | * Dave Engebretsen <engebret@us.ibm.com> | |
15 | * Rework for PPC64 port. | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU General Public License | |
19 | * as published by the Free Software Foundation; either version | |
20 | * 2 of the License, or (at your option) any later version. | |
21 | * | |
22 | */ | |
23 | ||
14cf11af PM |
24 | #include <linux/signal.h> |
25 | #include <linux/sched.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/string.h> | |
66b15db6 | 29 | #include <linux/export.h> |
14cf11af PM |
30 | #include <linux/types.h> |
31 | #include <linux/mman.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/swap.h> | |
34 | #include <linux/stddef.h> | |
35 | #include <linux/vmalloc.h> | |
95f72d1e | 36 | #include <linux/memblock.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
06743521 | 38 | #include <linux/hugetlb.h> |
14cf11af PM |
39 | |
40 | #include <asm/pgalloc.h> | |
41 | #include <asm/page.h> | |
42 | #include <asm/prom.h> | |
14cf11af PM |
43 | #include <asm/io.h> |
44 | #include <asm/mmu_context.h> | |
45 | #include <asm/pgtable.h> | |
46 | #include <asm/mmu.h> | |
14cf11af PM |
47 | #include <asm/smp.h> |
48 | #include <asm/machdep.h> | |
49 | #include <asm/tlb.h> | |
14cf11af | 50 | #include <asm/processor.h> |
14cf11af | 51 | #include <asm/cputable.h> |
14cf11af | 52 | #include <asm/sections.h> |
5e203d68 | 53 | #include <asm/firmware.h> |
68cf0d64 | 54 | #include <asm/dma.h> |
800fc3ee DG |
55 | |
56 | #include "mmu_decl.h" | |
14cf11af | 57 | |
78f1dbde | 58 | #ifdef CONFIG_PPC_STD_MMU_64 |
af81d787 | 59 | #if TASK_SIZE_USER64 > (1UL << (ESID_BITS + SID_SHIFT)) |
78f1dbde AK |
60 | #error TASK_SIZE_USER64 exceeds user VSID range |
61 | #endif | |
62 | #endif | |
14cf11af | 63 | |
50de596d AK |
64 | #ifdef CONFIG_PPC_BOOK3S_64 |
65 | /* | |
66 | * partition table and process table for ISA 3.0 | |
67 | */ | |
68 | struct prtb_entry *process_tb; | |
69 | struct patb_entry *partition_tb; | |
dd1842a2 AK |
70 | /* |
71 | * page table size | |
72 | */ | |
73 | unsigned long __pte_index_size; | |
74 | EXPORT_SYMBOL(__pte_index_size); | |
75 | unsigned long __pmd_index_size; | |
76 | EXPORT_SYMBOL(__pmd_index_size); | |
77 | unsigned long __pud_index_size; | |
78 | EXPORT_SYMBOL(__pud_index_size); | |
79 | unsigned long __pgd_index_size; | |
80 | EXPORT_SYMBOL(__pgd_index_size); | |
81 | unsigned long __pmd_cache_index; | |
82 | EXPORT_SYMBOL(__pmd_cache_index); | |
83 | unsigned long __pte_table_size; | |
84 | EXPORT_SYMBOL(__pte_table_size); | |
85 | unsigned long __pmd_table_size; | |
86 | EXPORT_SYMBOL(__pmd_table_size); | |
87 | unsigned long __pud_table_size; | |
88 | EXPORT_SYMBOL(__pud_table_size); | |
89 | unsigned long __pgd_table_size; | |
90 | EXPORT_SYMBOL(__pgd_table_size); | |
a2f41eb9 AK |
91 | unsigned long __pmd_val_bits; |
92 | EXPORT_SYMBOL(__pmd_val_bits); | |
93 | unsigned long __pud_val_bits; | |
94 | EXPORT_SYMBOL(__pud_val_bits); | |
95 | unsigned long __pgd_val_bits; | |
96 | EXPORT_SYMBOL(__pgd_val_bits); | |
d6a9996e AK |
97 | unsigned long __kernel_virt_start; |
98 | EXPORT_SYMBOL(__kernel_virt_start); | |
99 | unsigned long __kernel_virt_size; | |
100 | EXPORT_SYMBOL(__kernel_virt_size); | |
101 | unsigned long __vmalloc_start; | |
102 | EXPORT_SYMBOL(__vmalloc_start); | |
103 | unsigned long __vmalloc_end; | |
104 | EXPORT_SYMBOL(__vmalloc_end); | |
105 | struct page *vmemmap; | |
106 | EXPORT_SYMBOL(vmemmap); | |
5ed7ecd0 AK |
107 | unsigned long __pte_frag_nr; |
108 | EXPORT_SYMBOL(__pte_frag_nr); | |
109 | unsigned long __pte_frag_size_shift; | |
110 | EXPORT_SYMBOL(__pte_frag_size_shift); | |
d6a9996e AK |
111 | unsigned long ioremap_bot; |
112 | #else /* !CONFIG_PPC_BOOK3S_64 */ | |
78f1dbde | 113 | unsigned long ioremap_bot = IOREMAP_BASE; |
d6a9996e | 114 | #endif |
a245067e | 115 | |
3d5134ee BH |
116 | /** |
117 | * __ioremap_at - Low level function to establish the page tables | |
118 | * for an IO mapping | |
119 | */ | |
120 | void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size, | |
14cf11af PM |
121 | unsigned long flags) |
122 | { | |
123 | unsigned long i; | |
124 | ||
a1f242ff | 125 | /* Make sure we have the base flags */ |
14cf11af PM |
126 | if ((flags & _PAGE_PRESENT) == 0) |
127 | flags |= pgprot_val(PAGE_KERNEL); | |
128 | ||
a1f242ff | 129 | /* We don't support the 4K PFN hack with ioremap */ |
945537df | 130 | if (flags & H_PAGE_4K_PFN) |
a1f242ff BH |
131 | return NULL; |
132 | ||
3d5134ee BH |
133 | WARN_ON(pa & ~PAGE_MASK); |
134 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); | |
135 | WARN_ON(size & ~PAGE_MASK); | |
136 | ||
14cf11af | 137 | for (i = 0; i < size; i += PAGE_SIZE) |
a245067e | 138 | if (map_kernel_page((unsigned long)ea+i, pa+i, flags)) |
14cf11af PM |
139 | return NULL; |
140 | ||
3d5134ee BH |
141 | return (void __iomem *)ea; |
142 | } | |
143 | ||
144 | /** | |
145 | * __iounmap_from - Low level function to tear down the page tables | |
146 | * for an IO mapping. This is used for mappings that | |
147 | * are manipulated manually, like partial unmapping of | |
148 | * PCI IOs or ISA space. | |
149 | */ | |
150 | void __iounmap_at(void *ea, unsigned long size) | |
151 | { | |
152 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); | |
153 | WARN_ON(size & ~PAGE_MASK); | |
154 | ||
155 | unmap_kernel_range((unsigned long)ea, size); | |
14cf11af PM |
156 | } |
157 | ||
1cdab55d BH |
158 | void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size, |
159 | unsigned long flags, void *caller) | |
14cf11af | 160 | { |
3d5134ee | 161 | phys_addr_t paligned; |
14cf11af PM |
162 | void __iomem *ret; |
163 | ||
164 | /* | |
165 | * Choose an address to map it to. | |
166 | * Once the imalloc system is running, we use it. | |
167 | * Before that, we map using addresses going | |
168 | * up from ioremap_bot. imalloc will use | |
169 | * the addresses from ioremap_bot through | |
170 | * IMALLOC_END | |
171 | * | |
172 | */ | |
3d5134ee BH |
173 | paligned = addr & PAGE_MASK; |
174 | size = PAGE_ALIGN(addr + size) - paligned; | |
14cf11af | 175 | |
3d5134ee | 176 | if ((size == 0) || (paligned == 0)) |
14cf11af PM |
177 | return NULL; |
178 | ||
f691fa10 | 179 | if (slab_is_available()) { |
14cf11af | 180 | struct vm_struct *area; |
3d5134ee | 181 | |
1cdab55d BH |
182 | area = __get_vm_area_caller(size, VM_IOREMAP, |
183 | ioremap_bot, IOREMAP_END, | |
184 | caller); | |
14cf11af PM |
185 | if (area == NULL) |
186 | return NULL; | |
7a9d1256 ME |
187 | |
188 | area->phys_addr = paligned; | |
3d5134ee | 189 | ret = __ioremap_at(paligned, area->addr, size, flags); |
14cf11af | 190 | if (!ret) |
3d5134ee | 191 | vunmap(area->addr); |
14cf11af | 192 | } else { |
3d5134ee | 193 | ret = __ioremap_at(paligned, (void *)ioremap_bot, size, flags); |
14cf11af PM |
194 | if (ret) |
195 | ioremap_bot += size; | |
196 | } | |
3d5134ee BH |
197 | |
198 | if (ret) | |
199 | ret += addr & ~PAGE_MASK; | |
14cf11af PM |
200 | return ret; |
201 | } | |
202 | ||
1cdab55d BH |
203 | void __iomem * __ioremap(phys_addr_t addr, unsigned long size, |
204 | unsigned long flags) | |
205 | { | |
206 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); | |
207 | } | |
4cb3cee0 | 208 | |
68a64357 | 209 | void __iomem * ioremap(phys_addr_t addr, unsigned long size) |
4cb3cee0 | 210 | { |
72176dd0 | 211 | unsigned long flags = pgprot_val(pgprot_noncached(__pgprot(0))); |
1cdab55d | 212 | void *caller = __builtin_return_address(0); |
4cb3cee0 BH |
213 | |
214 | if (ppc_md.ioremap) | |
1cdab55d BH |
215 | return ppc_md.ioremap(addr, size, flags, caller); |
216 | return __ioremap_caller(addr, size, flags, caller); | |
4cb3cee0 BH |
217 | } |
218 | ||
be135f40 AB |
219 | void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size) |
220 | { | |
72176dd0 | 221 | unsigned long flags = pgprot_val(pgprot_noncached_wc(__pgprot(0))); |
be135f40 AB |
222 | void *caller = __builtin_return_address(0); |
223 | ||
224 | if (ppc_md.ioremap) | |
225 | return ppc_md.ioremap(addr, size, flags, caller); | |
226 | return __ioremap_caller(addr, size, flags, caller); | |
227 | } | |
228 | ||
40f1ce7f | 229 | void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size, |
4cb3cee0 BH |
230 | unsigned long flags) |
231 | { | |
1cdab55d BH |
232 | void *caller = __builtin_return_address(0); |
233 | ||
a1f242ff | 234 | /* writeable implies dirty for kernel addresses */ |
c7d54842 | 235 | if (flags & _PAGE_WRITE) |
a1f242ff BH |
236 | flags |= _PAGE_DIRTY; |
237 | ||
ac29c640 AK |
238 | /* we don't want to let _PAGE_EXEC leak out */ |
239 | flags &= ~_PAGE_EXEC; | |
240 | /* | |
241 | * Force kernel mapping. | |
242 | */ | |
243 | #if defined(CONFIG_PPC_BOOK3S_64) | |
244 | flags |= _PAGE_PRIVILEGED; | |
245 | #else | |
246 | flags &= ~_PAGE_USER; | |
247 | #endif | |
248 | ||
a1f242ff | 249 | |
55052eec BH |
250 | #ifdef _PAGE_BAP_SR |
251 | /* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format | |
252 | * which means that we just cleared supervisor access... oops ;-) This | |
253 | * restores it | |
254 | */ | |
255 | flags |= _PAGE_BAP_SR; | |
256 | #endif | |
257 | ||
4cb3cee0 | 258 | if (ppc_md.ioremap) |
1cdab55d BH |
259 | return ppc_md.ioremap(addr, size, flags, caller); |
260 | return __ioremap_caller(addr, size, flags, caller); | |
4cb3cee0 BH |
261 | } |
262 | ||
263 | ||
14cf11af PM |
264 | /* |
265 | * Unmap an IO region and remove it from imalloc'd list. | |
266 | * Access to IO memory should be serialized by driver. | |
14cf11af | 267 | */ |
68a64357 | 268 | void __iounmap(volatile void __iomem *token) |
14cf11af PM |
269 | { |
270 | void *addr; | |
271 | ||
f691fa10 | 272 | if (!slab_is_available()) |
14cf11af PM |
273 | return; |
274 | ||
3d5134ee BH |
275 | addr = (void *) ((unsigned long __force) |
276 | PCI_FIX_ADDR(token) & PAGE_MASK); | |
277 | if ((unsigned long)addr < ioremap_bot) { | |
278 | printk(KERN_WARNING "Attempt to iounmap early bolted mapping" | |
279 | " at 0x%p\n", addr); | |
280 | return; | |
281 | } | |
282 | vunmap(addr); | |
14cf11af PM |
283 | } |
284 | ||
68a64357 | 285 | void iounmap(volatile void __iomem *token) |
4cb3cee0 BH |
286 | { |
287 | if (ppc_md.iounmap) | |
288 | ppc_md.iounmap(token); | |
289 | else | |
290 | __iounmap(token); | |
291 | } | |
292 | ||
14cf11af | 293 | EXPORT_SYMBOL(ioremap); |
be135f40 | 294 | EXPORT_SYMBOL(ioremap_wc); |
40f1ce7f | 295 | EXPORT_SYMBOL(ioremap_prot); |
14cf11af | 296 | EXPORT_SYMBOL(__ioremap); |
a302cb9d | 297 | EXPORT_SYMBOL(__ioremap_at); |
14cf11af | 298 | EXPORT_SYMBOL(iounmap); |
4cb3cee0 | 299 | EXPORT_SYMBOL(__iounmap); |
a302cb9d | 300 | EXPORT_SYMBOL(__iounmap_at); |
5c1f6ee9 | 301 | |
06743521 AK |
302 | #ifndef __PAGETABLE_PUD_FOLDED |
303 | /* 4 level page table */ | |
304 | struct page *pgd_page(pgd_t pgd) | |
305 | { | |
306 | if (pgd_huge(pgd)) | |
307 | return pte_page(pgd_pte(pgd)); | |
308 | return virt_to_page(pgd_page_vaddr(pgd)); | |
309 | } | |
310 | #endif | |
311 | ||
312 | struct page *pud_page(pud_t pud) | |
313 | { | |
314 | if (pud_huge(pud)) | |
315 | return pte_page(pud_pte(pud)); | |
316 | return virt_to_page(pud_page_vaddr(pud)); | |
317 | } | |
318 | ||
074c2eae AK |
319 | /* |
320 | * For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags | |
321 | * For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address. | |
322 | */ | |
323 | struct page *pmd_page(pmd_t pmd) | |
324 | { | |
06743521 | 325 | if (pmd_trans_huge(pmd) || pmd_huge(pmd)) |
e34aa03c | 326 | return pte_page(pmd_pte(pmd)); |
074c2eae AK |
327 | return virt_to_page(pmd_page_vaddr(pmd)); |
328 | } | |
329 | ||
5c1f6ee9 AK |
330 | #ifdef CONFIG_PPC_64K_PAGES |
331 | static pte_t *get_from_cache(struct mm_struct *mm) | |
332 | { | |
333 | void *pte_frag, *ret; | |
334 | ||
335 | spin_lock(&mm->page_table_lock); | |
336 | ret = mm->context.pte_frag; | |
337 | if (ret) { | |
338 | pte_frag = ret + PTE_FRAG_SIZE; | |
339 | /* | |
340 | * If we have taken up all the fragments mark PTE page NULL | |
341 | */ | |
342 | if (((unsigned long)pte_frag & ~PAGE_MASK) == 0) | |
343 | pte_frag = NULL; | |
344 | mm->context.pte_frag = pte_frag; | |
345 | } | |
346 | spin_unlock(&mm->page_table_lock); | |
347 | return (pte_t *)ret; | |
348 | } | |
349 | ||
350 | static pte_t *__alloc_for_cache(struct mm_struct *mm, int kernel) | |
351 | { | |
352 | void *ret = NULL; | |
32d6bd90 | 353 | struct page *page = alloc_page(GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO); |
5c1f6ee9 AK |
354 | if (!page) |
355 | return NULL; | |
4f804943 KS |
356 | if (!kernel && !pgtable_page_ctor(page)) { |
357 | __free_page(page); | |
358 | return NULL; | |
359 | } | |
5c1f6ee9 AK |
360 | |
361 | ret = page_address(page); | |
362 | spin_lock(&mm->page_table_lock); | |
363 | /* | |
364 | * If we find pgtable_page set, we return | |
365 | * the allocated page with single fragement | |
366 | * count. | |
367 | */ | |
368 | if (likely(!mm->context.pte_frag)) { | |
fe896d18 | 369 | set_page_count(page, PTE_FRAG_NR); |
5c1f6ee9 AK |
370 | mm->context.pte_frag = ret + PTE_FRAG_SIZE; |
371 | } | |
372 | spin_unlock(&mm->page_table_lock); | |
373 | ||
5c1f6ee9 AK |
374 | return (pte_t *)ret; |
375 | } | |
376 | ||
74701d59 | 377 | pte_t *pte_fragment_alloc(struct mm_struct *mm, unsigned long vmaddr, int kernel) |
5c1f6ee9 AK |
378 | { |
379 | pte_t *pte; | |
380 | ||
381 | pte = get_from_cache(mm); | |
382 | if (pte) | |
383 | return pte; | |
384 | ||
385 | return __alloc_for_cache(mm, kernel); | |
386 | } | |
934828ed | 387 | #endif /* CONFIG_PPC_64K_PAGES */ |
5c1f6ee9 | 388 | |
74701d59 | 389 | void pte_fragment_free(unsigned long *table, int kernel) |
5c1f6ee9 AK |
390 | { |
391 | struct page *page = virt_to_page(table); | |
392 | if (put_page_testzero(page)) { | |
393 | if (!kernel) | |
394 | pgtable_page_dtor(page); | |
395 | free_hot_cold_page(page, 0); | |
396 | } | |
397 | } | |
398 | ||
399 | #ifdef CONFIG_SMP | |
5c1f6ee9 AK |
400 | void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift) |
401 | { | |
402 | unsigned long pgf = (unsigned long)table; | |
403 | ||
404 | BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); | |
405 | pgf |= shift; | |
406 | tlb_remove_table(tlb, (void *)pgf); | |
407 | } | |
408 | ||
409 | void __tlb_remove_table(void *_table) | |
410 | { | |
411 | void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE); | |
412 | unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE; | |
413 | ||
414 | if (!shift) | |
415 | /* PTE page needs special handling */ | |
74701d59 | 416 | pte_fragment_free(table, 0); |
5c1f6ee9 AK |
417 | else { |
418 | BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); | |
419 | kmem_cache_free(PGT_CACHE(shift), table); | |
420 | } | |
421 | } | |
422 | #else | |
423 | void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift) | |
424 | { | |
425 | if (!shift) { | |
426 | /* PTE page needs special handling */ | |
74701d59 | 427 | pte_fragment_free(table, 0); |
5c1f6ee9 AK |
428 | } else { |
429 | BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); | |
430 | kmem_cache_free(PGT_CACHE(shift), table); | |
431 | } | |
432 | } | |
433 | #endif |