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14cf11af PM |
1 | /* |
2 | * PowerPC version | |
3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
4 | * | |
5 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | |
6 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
7 | * Copyright (C) 1996 Paul Mackerras | |
14cf11af PM |
8 | * |
9 | * Derived from "arch/i386/mm/init.c" | |
10 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
11 | * | |
12 | * Dave Engebretsen <engebret@us.ibm.com> | |
13 | * Rework for PPC64 port. | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
19 | * | |
20 | */ | |
21 | ||
cec08e7a BH |
22 | #undef DEBUG |
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> | |
29 | #include <linux/types.h> | |
30 | #include <linux/mman.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/swap.h> | |
33 | #include <linux/stddef.h> | |
34 | #include <linux/vmalloc.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/delay.h> | |
14cf11af PM |
37 | #include <linux/highmem.h> |
38 | #include <linux/idr.h> | |
39 | #include <linux/nodemask.h> | |
40 | #include <linux/module.h> | |
c9cf5528 | 41 | #include <linux/poison.h> |
95f72d1e | 42 | #include <linux/memblock.h> |
a4fe3ce7 | 43 | #include <linux/hugetlb.h> |
5a0e3ad6 | 44 | #include <linux/slab.h> |
18569c1f PM |
45 | #include <linux/of_fdt.h> |
46 | #include <linux/libfdt.h> | |
14cf11af PM |
47 | |
48 | #include <asm/pgalloc.h> | |
49 | #include <asm/page.h> | |
50 | #include <asm/prom.h> | |
14cf11af PM |
51 | #include <asm/rtas.h> |
52 | #include <asm/io.h> | |
53 | #include <asm/mmu_context.h> | |
54 | #include <asm/pgtable.h> | |
55 | #include <asm/mmu.h> | |
7c0f6ba6 | 56 | #include <linux/uaccess.h> |
14cf11af PM |
57 | #include <asm/smp.h> |
58 | #include <asm/machdep.h> | |
59 | #include <asm/tlb.h> | |
60 | #include <asm/eeh.h> | |
61 | #include <asm/processor.h> | |
62 | #include <asm/mmzone.h> | |
63 | #include <asm/cputable.h> | |
14cf11af | 64 | #include <asm/sections.h> |
14cf11af | 65 | #include <asm/iommu.h> |
14cf11af | 66 | #include <asm/vdso.h> |
800fc3ee DG |
67 | |
68 | #include "mmu_decl.h" | |
14cf11af | 69 | |
94491685 | 70 | #ifdef CONFIG_PPC_STD_MMU_64 |
dd1842a2 | 71 | #if H_PGTABLE_RANGE > USER_VSID_RANGE |
14cf11af PM |
72 | #warning Limited user VSID range means pagetable space is wasted |
73 | #endif | |
74 | ||
dd1842a2 | 75 | #if (TASK_SIZE_USER64 < H_PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE) |
14cf11af PM |
76 | #warning TASK_SIZE is smaller than it needs to be. |
77 | #endif | |
94491685 | 78 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
14cf11af | 79 | |
37dd2bad | 80 | phys_addr_t memstart_addr = ~0; |
79c3095f | 81 | EXPORT_SYMBOL_GPL(memstart_addr); |
37dd2bad | 82 | phys_addr_t kernstart_addr; |
79c3095f | 83 | EXPORT_SYMBOL_GPL(kernstart_addr); |
d7917ba7 | 84 | |
d29eff7b AW |
85 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
86 | /* | |
87 | * Given an address within the vmemmap, determine the pfn of the page that | |
88 | * represents the start of the section it is within. Note that we have to | |
89 | * do this by hand as the proffered address may not be correctly aligned. | |
90 | * Subtraction of non-aligned pointers produces undefined results. | |
91 | */ | |
09de9ff8 | 92 | static unsigned long __meminit vmemmap_section_start(unsigned long page) |
d29eff7b AW |
93 | { |
94 | unsigned long offset = page - ((unsigned long)(vmemmap)); | |
95 | ||
96 | /* Return the pfn of the start of the section. */ | |
97 | return (offset / sizeof(struct page)) & PAGE_SECTION_MASK; | |
98 | } | |
99 | ||
100 | /* | |
101 | * Check if this vmemmap page is already initialised. If any section | |
102 | * which overlaps this vmemmap page is initialised then this page is | |
103 | * initialised already. | |
104 | */ | |
09de9ff8 | 105 | static int __meminit vmemmap_populated(unsigned long start, int page_size) |
d29eff7b AW |
106 | { |
107 | unsigned long end = start + page_size; | |
16a05bff | 108 | start = (unsigned long)(pfn_to_page(vmemmap_section_start(start))); |
d29eff7b AW |
109 | |
110 | for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page))) | |
16a05bff | 111 | if (pfn_valid(page_to_pfn((struct page *)start))) |
d29eff7b AW |
112 | return 1; |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
91eea67c | 117 | struct vmemmap_backing *vmemmap_list; |
bd8cb03d LZ |
118 | static struct vmemmap_backing *next; |
119 | static int num_left; | |
120 | static int num_freed; | |
91eea67c MN |
121 | |
122 | static __meminit struct vmemmap_backing * vmemmap_list_alloc(int node) | |
123 | { | |
bd8cb03d LZ |
124 | struct vmemmap_backing *vmem_back; |
125 | /* get from freed entries first */ | |
126 | if (num_freed) { | |
127 | num_freed--; | |
128 | vmem_back = next; | |
129 | next = next->list; | |
130 | ||
131 | return vmem_back; | |
132 | } | |
91eea67c MN |
133 | |
134 | /* allocate a page when required and hand out chunks */ | |
bd8cb03d | 135 | if (!num_left) { |
91eea67c MN |
136 | next = vmemmap_alloc_block(PAGE_SIZE, node); |
137 | if (unlikely(!next)) { | |
138 | WARN_ON(1); | |
139 | return NULL; | |
140 | } | |
141 | num_left = PAGE_SIZE / sizeof(struct vmemmap_backing); | |
142 | } | |
143 | ||
144 | num_left--; | |
145 | ||
146 | return next++; | |
147 | } | |
148 | ||
149 | static __meminit void vmemmap_list_populate(unsigned long phys, | |
150 | unsigned long start, | |
151 | int node) | |
152 | { | |
153 | struct vmemmap_backing *vmem_back; | |
154 | ||
155 | vmem_back = vmemmap_list_alloc(node); | |
156 | if (unlikely(!vmem_back)) { | |
157 | WARN_ON(1); | |
158 | return; | |
159 | } | |
160 | ||
161 | vmem_back->phys = phys; | |
162 | vmem_back->virt_addr = start; | |
163 | vmem_back->list = vmemmap_list; | |
164 | ||
165 | vmemmap_list = vmem_back; | |
166 | } | |
167 | ||
71b0bfe4 LZ |
168 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
169 | { | |
170 | unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift; | |
171 | ||
172 | /* Align to the page size of the linear mapping. */ | |
173 | start = _ALIGN_DOWN(start, page_size); | |
174 | ||
175 | pr_debug("vmemmap_populate %lx..%lx, node %d\n", start, end, node); | |
176 | ||
177 | for (; start < end; start += page_size) { | |
178 | void *p; | |
1dace6c6 | 179 | int rc; |
71b0bfe4 LZ |
180 | |
181 | if (vmemmap_populated(start, page_size)) | |
182 | continue; | |
183 | ||
184 | p = vmemmap_alloc_block(page_size, node); | |
185 | if (!p) | |
186 | return -ENOMEM; | |
187 | ||
188 | vmemmap_list_populate(__pa(p), start, node); | |
189 | ||
190 | pr_debug(" * %016lx..%016lx allocated at %p\n", | |
191 | start, start + page_size, p); | |
192 | ||
1dace6c6 DG |
193 | rc = vmemmap_create_mapping(start, page_size, __pa(p)); |
194 | if (rc < 0) { | |
195 | pr_warning( | |
196 | "vmemmap_populate: Unable to create vmemmap mapping: %d\n", | |
197 | rc); | |
198 | return -EFAULT; | |
199 | } | |
71b0bfe4 LZ |
200 | } |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | #ifdef CONFIG_MEMORY_HOTPLUG | |
bd8cb03d LZ |
206 | static unsigned long vmemmap_list_free(unsigned long start) |
207 | { | |
208 | struct vmemmap_backing *vmem_back, *vmem_back_prev; | |
209 | ||
210 | vmem_back_prev = vmem_back = vmemmap_list; | |
211 | ||
212 | /* look for it with prev pointer recorded */ | |
213 | for (; vmem_back; vmem_back = vmem_back->list) { | |
214 | if (vmem_back->virt_addr == start) | |
215 | break; | |
216 | vmem_back_prev = vmem_back; | |
217 | } | |
218 | ||
219 | if (unlikely(!vmem_back)) { | |
220 | WARN_ON(1); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | /* remove it from vmemmap_list */ | |
225 | if (vmem_back == vmemmap_list) /* remove head */ | |
226 | vmemmap_list = vmem_back->list; | |
227 | else | |
228 | vmem_back_prev->list = vmem_back->list; | |
229 | ||
230 | /* next point to this freed entry */ | |
231 | vmem_back->list = next; | |
232 | next = vmem_back; | |
233 | num_freed++; | |
234 | ||
235 | return vmem_back->phys; | |
236 | } | |
237 | ||
71b0bfe4 | 238 | void __ref vmemmap_free(unsigned long start, unsigned long end) |
d29eff7b | 239 | { |
cec08e7a | 240 | unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift; |
d29eff7b | 241 | |
d29eff7b AW |
242 | start = _ALIGN_DOWN(start, page_size); |
243 | ||
71b0bfe4 | 244 | pr_debug("vmemmap_free %lx...%lx\n", start, end); |
32a74949 | 245 | |
d29eff7b | 246 | for (; start < end; start += page_size) { |
71b0bfe4 | 247 | unsigned long addr; |
d29eff7b | 248 | |
71b0bfe4 LZ |
249 | /* |
250 | * the section has already be marked as invalid, so | |
251 | * vmemmap_populated() true means some other sections still | |
252 | * in this page, so skip it. | |
253 | */ | |
d29eff7b AW |
254 | if (vmemmap_populated(start, page_size)) |
255 | continue; | |
256 | ||
71b0bfe4 LZ |
257 | addr = vmemmap_list_free(start); |
258 | if (addr) { | |
259 | struct page *page = pfn_to_page(addr >> PAGE_SHIFT); | |
260 | ||
261 | if (PageReserved(page)) { | |
262 | /* allocated from bootmem */ | |
263 | if (page_size < PAGE_SIZE) { | |
264 | /* | |
265 | * this shouldn't happen, but if it is | |
266 | * the case, leave the memory there | |
267 | */ | |
268 | WARN_ON_ONCE(1); | |
269 | } else { | |
270 | unsigned int nr_pages = | |
271 | 1 << get_order(page_size); | |
272 | while (nr_pages--) | |
273 | free_reserved_page(page++); | |
274 | } | |
275 | } else | |
276 | free_pages((unsigned long)(__va(addr)), | |
277 | get_order(page_size)); | |
278 | ||
279 | vmemmap_remove_mapping(start, page_size); | |
280 | } | |
d29eff7b | 281 | } |
0197518c | 282 | } |
71b0bfe4 | 283 | #endif |
f7e3334a NF |
284 | void register_page_bootmem_memmap(unsigned long section_nr, |
285 | struct page *start_page, unsigned long size) | |
286 | { | |
287 | } | |
cd3db0c4 | 288 | |
8e0861fa AK |
289 | /* |
290 | * We do not have access to the sparsemem vmemmap, so we fallback to | |
291 | * walking the list of sparsemem blocks which we already maintain for | |
292 | * the sake of crashdump. In the long run, we might want to maintain | |
293 | * a tree if performance of that linear walk becomes a problem. | |
294 | * | |
295 | * realmode_pfn_to_page functions can fail due to: | |
296 | * 1) As real sparsemem blocks do not lay in RAM continously (they | |
297 | * are in virtual address space which is not available in the real mode), | |
298 | * the requested page struct can be split between blocks so get_page/put_page | |
299 | * may fail. | |
300 | * 2) When huge pages are used, the get_page/put_page API will fail | |
301 | * in real mode as the linked addresses in the page struct are virtual | |
302 | * too. | |
303 | */ | |
304 | struct page *realmode_pfn_to_page(unsigned long pfn) | |
305 | { | |
306 | struct vmemmap_backing *vmem_back; | |
307 | struct page *page; | |
308 | unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift; | |
309 | unsigned long pg_va = (unsigned long) pfn_to_page(pfn); | |
310 | ||
311 | for (vmem_back = vmemmap_list; vmem_back; vmem_back = vmem_back->list) { | |
312 | if (pg_va < vmem_back->virt_addr) | |
313 | continue; | |
314 | ||
bd8cb03d LZ |
315 | /* After vmemmap_list entry free is possible, need check all */ |
316 | if ((pg_va + sizeof(struct page)) <= | |
317 | (vmem_back->virt_addr + page_size)) { | |
318 | page = (struct page *) (vmem_back->phys + pg_va - | |
8e0861fa | 319 | vmem_back->virt_addr); |
bd8cb03d LZ |
320 | return page; |
321 | } | |
8e0861fa AK |
322 | } |
323 | ||
bd8cb03d | 324 | /* Probably that page struct is split between real pages */ |
8e0861fa AK |
325 | return NULL; |
326 | } | |
327 | EXPORT_SYMBOL_GPL(realmode_pfn_to_page); | |
328 | ||
329 | #elif defined(CONFIG_FLATMEM) | |
330 | ||
331 | struct page *realmode_pfn_to_page(unsigned long pfn) | |
332 | { | |
333 | struct page *page = pfn_to_page(pfn); | |
334 | return page; | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(realmode_pfn_to_page); | |
337 | ||
338 | #endif /* CONFIG_SPARSEMEM_VMEMMAP/CONFIG_FLATMEM */ | |
1a01dc87 ME |
339 | |
340 | #ifdef CONFIG_PPC_STD_MMU_64 | |
c610ec60 ME |
341 | static bool disable_radix; |
342 | static int __init parse_disable_radix(char *p) | |
343 | { | |
344 | disable_radix = true; | |
345 | return 0; | |
346 | } | |
347 | early_param("disable_radix", parse_disable_radix); | |
348 | ||
18569c1f | 349 | /* |
cc3d2940 PM |
350 | * If we're running under a hypervisor, we need to check the contents of |
351 | * /chosen/ibm,architecture-vec-5 to see if the hypervisor is willing to do | |
352 | * radix. If not, we clear the radix feature bit so we fall back to hash. | |
18569c1f PM |
353 | */ |
354 | static void early_check_vec5(void) | |
355 | { | |
356 | unsigned long root, chosen; | |
357 | int size; | |
358 | const u8 *vec5; | |
014d02cb | 359 | u8 mmu_supported; |
18569c1f PM |
360 | |
361 | root = of_get_flat_dt_root(); | |
362 | chosen = of_get_flat_dt_subnode_by_name(root, "chosen"); | |
014d02cb SJS |
363 | if (chosen == -FDT_ERR_NOTFOUND) { |
364 | cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; | |
18569c1f | 365 | return; |
014d02cb | 366 | } |
18569c1f | 367 | vec5 = of_get_flat_dt_prop(chosen, "ibm,architecture-vec-5", &size); |
014d02cb SJS |
368 | if (!vec5) { |
369 | cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; | |
18569c1f | 370 | return; |
014d02cb SJS |
371 | } |
372 | if (size <= OV5_INDX(OV5_MMU_SUPPORT)) { | |
cc3d2940 | 373 | cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; |
014d02cb SJS |
374 | return; |
375 | } | |
376 | ||
377 | /* Check for supported configuration */ | |
378 | mmu_supported = vec5[OV5_INDX(OV5_MMU_SUPPORT)] & | |
379 | OV5_FEAT(OV5_MMU_SUPPORT); | |
380 | if (mmu_supported == OV5_FEAT(OV5_MMU_RADIX)) { | |
381 | /* Hypervisor only supports radix - check enabled && GTSE */ | |
382 | if (!early_radix_enabled()) { | |
383 | pr_warn("WARNING: Ignoring cmdline option disable_radix\n"); | |
384 | } | |
385 | if (!(vec5[OV5_INDX(OV5_RADIX_GTSE)] & | |
386 | OV5_FEAT(OV5_RADIX_GTSE))) { | |
387 | pr_warn("WARNING: Hypervisor doesn't support RADIX with GTSE\n"); | |
388 | } | |
389 | /* Do radix anyway - the hypervisor said we had to */ | |
390 | cur_cpu_spec->mmu_features |= MMU_FTR_TYPE_RADIX; | |
391 | } else if (mmu_supported == OV5_FEAT(OV5_MMU_HASH)) { | |
392 | /* Hypervisor only supports hash - disable radix */ | |
393 | cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; | |
394 | } | |
18569c1f PM |
395 | } |
396 | ||
1a01dc87 ME |
397 | void __init mmu_early_init_devtree(void) |
398 | { | |
c610ec60 | 399 | /* Disable radix mode based on kernel command line. */ |
fc36a903 | 400 | if (disable_radix) |
5a25b6f5 | 401 | cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; |
bacf9cf8 | 402 | |
18569c1f PM |
403 | /* |
404 | * Check /chosen/ibm,architecture-vec-5 if running as a guest. | |
405 | * When running bare-metal, we can use radix if we like | |
406 | * even though the ibm,architecture-vec-5 property created by | |
407 | * skiboot doesn't have the necessary bits set. | |
408 | */ | |
014d02cb | 409 | if (!(mfmsr() & MSR_HV)) |
18569c1f PM |
410 | early_check_vec5(); |
411 | ||
b8f1b4f8 | 412 | if (early_radix_enabled()) |
2537b09c ME |
413 | radix__early_init_devtree(); |
414 | else | |
bacf9cf8 | 415 | hash__early_init_devtree(); |
1a01dc87 ME |
416 | } |
417 | #endif /* CONFIG_PPC_STD_MMU_64 */ |