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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f4eb07c1 | 2 | /* |
f4eb07c1 HC |
3 | * Copyright IBM Corp. 2006 |
4 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> | |
5 | */ | |
6 | ||
7 | #include <linux/bootmem.h> | |
8 | #include <linux/pfn.h> | |
9 | #include <linux/mm.h> | |
ff24b07a | 10 | #include <linux/init.h> |
f4eb07c1 | 11 | #include <linux/list.h> |
53492b1d | 12 | #include <linux/hugetlb.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
50be6345 | 14 | #include <linux/memblock.h> |
bab247ff | 15 | #include <asm/cacheflush.h> |
f4eb07c1 HC |
16 | #include <asm/pgalloc.h> |
17 | #include <asm/pgtable.h> | |
18 | #include <asm/setup.h> | |
19 | #include <asm/tlbflush.h> | |
53492b1d | 20 | #include <asm/sections.h> |
e6c7c630 | 21 | #include <asm/set_memory.h> |
f4eb07c1 | 22 | |
f4eb07c1 HC |
23 | static DEFINE_MUTEX(vmem_mutex); |
24 | ||
25 | struct memory_segment { | |
26 | struct list_head list; | |
27 | unsigned long start; | |
28 | unsigned long size; | |
29 | }; | |
30 | ||
31 | static LIST_HEAD(mem_segs); | |
32 | ||
67060d9c HC |
33 | static void __ref *vmem_alloc_pages(unsigned int order) |
34 | { | |
2e9996fc HC |
35 | unsigned long size = PAGE_SIZE << order; |
36 | ||
67060d9c HC |
37 | if (slab_is_available()) |
38 | return (void *)__get_free_pages(GFP_KERNEL, order); | |
9e427365 | 39 | return (void *) memblock_alloc(size, size); |
67060d9c HC |
40 | } |
41 | ||
a01ef308 | 42 | void *vmem_crst_alloc(unsigned long val) |
1aea9b3f | 43 | { |
a01ef308 | 44 | unsigned long *table; |
1aea9b3f | 45 | |
a01ef308 HC |
46 | table = vmem_alloc_pages(CRST_ALLOC_ORDER); |
47 | if (table) | |
48 | crst_table_init(table, val); | |
49 | return table; | |
f4eb07c1 HC |
50 | } |
51 | ||
e8a97e42 | 52 | pte_t __ref *vmem_pte_alloc(void) |
f4eb07c1 | 53 | { |
9e427365 | 54 | unsigned long size = PTRS_PER_PTE * sizeof(pte_t); |
146e4b3c | 55 | pte_t *pte; |
f4eb07c1 | 56 | |
146e4b3c | 57 | if (slab_is_available()) |
527e30b4 | 58 | pte = (pte_t *) page_table_alloc(&init_mm); |
146e4b3c | 59 | else |
9e427365 | 60 | pte = (pte_t *) memblock_alloc(size, size); |
f4eb07c1 HC |
61 | if (!pte) |
62 | return NULL; | |
9e427365 | 63 | clear_table((unsigned long *) pte, _PAGE_INVALID, size); |
f4eb07c1 HC |
64 | return pte; |
65 | } | |
66 | ||
67 | /* | |
68 | * Add a physical memory range to the 1:1 mapping. | |
69 | */ | |
bab247ff | 70 | static int vmem_add_mem(unsigned long start, unsigned long size) |
f4eb07c1 | 71 | { |
57d7f939 | 72 | unsigned long pgt_prot, sgt_prot, r3_prot; |
37cd944c | 73 | unsigned long pages4k, pages1m, pages2g; |
378b1e7a HC |
74 | unsigned long end = start + size; |
75 | unsigned long address = start; | |
f4eb07c1 | 76 | pgd_t *pg_dir; |
1aea9b3f | 77 | p4d_t *p4_dir; |
190a1d72 | 78 | pud_t *pu_dir; |
f4eb07c1 HC |
79 | pmd_t *pm_dir; |
80 | pte_t *pt_dir; | |
f4eb07c1 HC |
81 | int ret = -ENOMEM; |
82 | ||
57d7f939 MS |
83 | pgt_prot = pgprot_val(PAGE_KERNEL); |
84 | sgt_prot = pgprot_val(SEGMENT_KERNEL); | |
85 | r3_prot = pgprot_val(REGION3_KERNEL); | |
86 | if (!MACHINE_HAS_NX) { | |
87 | pgt_prot &= ~_PAGE_NOEXEC; | |
88 | sgt_prot &= ~_SEGMENT_ENTRY_NOEXEC; | |
89 | r3_prot &= ~_REGION_ENTRY_NOEXEC; | |
90 | } | |
37cd944c | 91 | pages4k = pages1m = pages2g = 0; |
378b1e7a | 92 | while (address < end) { |
f4eb07c1 HC |
93 | pg_dir = pgd_offset_k(address); |
94 | if (pgd_none(*pg_dir)) { | |
a01ef308 | 95 | p4_dir = vmem_crst_alloc(_REGION2_ENTRY_EMPTY); |
1aea9b3f MS |
96 | if (!p4_dir) |
97 | goto out; | |
98 | pgd_populate(&init_mm, pg_dir, p4_dir); | |
99 | } | |
100 | p4_dir = p4d_offset(pg_dir, address); | |
101 | if (p4d_none(*p4_dir)) { | |
a01ef308 | 102 | pu_dir = vmem_crst_alloc(_REGION3_ENTRY_EMPTY); |
190a1d72 MS |
103 | if (!pu_dir) |
104 | goto out; | |
1aea9b3f | 105 | p4d_populate(&init_mm, p4_dir, pu_dir); |
190a1d72 | 106 | } |
1aea9b3f | 107 | pu_dir = pud_offset(p4_dir, address); |
18da2369 | 108 | if (MACHINE_HAS_EDAT2 && pud_none(*pu_dir) && address && |
10917b83 CB |
109 | !(address & ~PUD_MASK) && (address + PUD_SIZE <= end) && |
110 | !debug_pagealloc_enabled()) { | |
57d7f939 | 111 | pud_val(*pu_dir) = address | r3_prot; |
18da2369 | 112 | address += PUD_SIZE; |
37cd944c | 113 | pages2g++; |
18da2369 HC |
114 | continue; |
115 | } | |
190a1d72 | 116 | if (pud_none(*pu_dir)) { |
a01ef308 | 117 | pm_dir = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY); |
f4eb07c1 HC |
118 | if (!pm_dir) |
119 | goto out; | |
b2fa47e6 | 120 | pud_populate(&init_mm, pu_dir, pm_dir); |
f4eb07c1 | 121 | } |
190a1d72 | 122 | pm_dir = pmd_offset(pu_dir, address); |
fc7e48aa | 123 | if (MACHINE_HAS_EDAT1 && pmd_none(*pm_dir) && address && |
10917b83 CB |
124 | !(address & ~PMD_MASK) && (address + PMD_SIZE <= end) && |
125 | !debug_pagealloc_enabled()) { | |
57d7f939 | 126 | pmd_val(*pm_dir) = address | sgt_prot; |
378b1e7a | 127 | address += PMD_SIZE; |
37cd944c | 128 | pages1m++; |
53492b1d GS |
129 | continue; |
130 | } | |
f4eb07c1 | 131 | if (pmd_none(*pm_dir)) { |
c53db522 | 132 | pt_dir = vmem_pte_alloc(); |
f4eb07c1 HC |
133 | if (!pt_dir) |
134 | goto out; | |
b2fa47e6 | 135 | pmd_populate(&init_mm, pm_dir, pt_dir); |
f4eb07c1 HC |
136 | } |
137 | ||
138 | pt_dir = pte_offset_kernel(pm_dir, address); | |
57d7f939 | 139 | pte_val(*pt_dir) = address | pgt_prot; |
378b1e7a | 140 | address += PAGE_SIZE; |
37cd944c | 141 | pages4k++; |
f4eb07c1 HC |
142 | } |
143 | ret = 0; | |
144 | out: | |
37cd944c HC |
145 | update_page_count(PG_DIRECT_MAP_4K, pages4k); |
146 | update_page_count(PG_DIRECT_MAP_1M, pages1m); | |
147 | update_page_count(PG_DIRECT_MAP_2G, pages2g); | |
f4eb07c1 HC |
148 | return ret; |
149 | } | |
150 | ||
151 | /* | |
152 | * Remove a physical memory range from the 1:1 mapping. | |
153 | * Currently only invalidates page table entries. | |
154 | */ | |
155 | static void vmem_remove_range(unsigned long start, unsigned long size) | |
156 | { | |
37cd944c | 157 | unsigned long pages4k, pages1m, pages2g; |
378b1e7a HC |
158 | unsigned long end = start + size; |
159 | unsigned long address = start; | |
f4eb07c1 | 160 | pgd_t *pg_dir; |
1aea9b3f | 161 | p4d_t *p4_dir; |
190a1d72 | 162 | pud_t *pu_dir; |
f4eb07c1 HC |
163 | pmd_t *pm_dir; |
164 | pte_t *pt_dir; | |
f4eb07c1 | 165 | |
37cd944c | 166 | pages4k = pages1m = pages2g = 0; |
378b1e7a | 167 | while (address < end) { |
f4eb07c1 | 168 | pg_dir = pgd_offset_k(address); |
fc7e48aa HC |
169 | if (pgd_none(*pg_dir)) { |
170 | address += PGDIR_SIZE; | |
171 | continue; | |
172 | } | |
1aea9b3f MS |
173 | p4_dir = p4d_offset(pg_dir, address); |
174 | if (p4d_none(*p4_dir)) { | |
175 | address += P4D_SIZE; | |
176 | continue; | |
177 | } | |
178 | pu_dir = pud_offset(p4_dir, address); | |
fc7e48aa HC |
179 | if (pud_none(*pu_dir)) { |
180 | address += PUD_SIZE; | |
f4eb07c1 | 181 | continue; |
fc7e48aa | 182 | } |
18da2369 HC |
183 | if (pud_large(*pu_dir)) { |
184 | pud_clear(pu_dir); | |
185 | address += PUD_SIZE; | |
37cd944c | 186 | pages2g++; |
18da2369 HC |
187 | continue; |
188 | } | |
190a1d72 | 189 | pm_dir = pmd_offset(pu_dir, address); |
fc7e48aa HC |
190 | if (pmd_none(*pm_dir)) { |
191 | address += PMD_SIZE; | |
f4eb07c1 | 192 | continue; |
fc7e48aa | 193 | } |
378b1e7a | 194 | if (pmd_large(*pm_dir)) { |
b2fa47e6 | 195 | pmd_clear(pm_dir); |
378b1e7a | 196 | address += PMD_SIZE; |
37cd944c | 197 | pages1m++; |
53492b1d GS |
198 | continue; |
199 | } | |
f4eb07c1 | 200 | pt_dir = pte_offset_kernel(pm_dir, address); |
5aa29975 | 201 | pte_clear(&init_mm, address, pt_dir); |
378b1e7a | 202 | address += PAGE_SIZE; |
37cd944c | 203 | pages4k++; |
f4eb07c1 | 204 | } |
378b1e7a | 205 | flush_tlb_kernel_range(start, end); |
37cd944c HC |
206 | update_page_count(PG_DIRECT_MAP_4K, -pages4k); |
207 | update_page_count(PG_DIRECT_MAP_1M, -pages1m); | |
208 | update_page_count(PG_DIRECT_MAP_2G, -pages2g); | |
f4eb07c1 HC |
209 | } |
210 | ||
211 | /* | |
212 | * Add a backed mem_map array to the virtual mem_map array. | |
213 | */ | |
0aad818b | 214 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
f4eb07c1 | 215 | { |
57d7f939 | 216 | unsigned long pgt_prot, sgt_prot; |
0aad818b | 217 | unsigned long address = start; |
f4eb07c1 | 218 | pgd_t *pg_dir; |
1aea9b3f | 219 | p4d_t *p4_dir; |
190a1d72 | 220 | pud_t *pu_dir; |
f4eb07c1 HC |
221 | pmd_t *pm_dir; |
222 | pte_t *pt_dir; | |
f4eb07c1 HC |
223 | int ret = -ENOMEM; |
224 | ||
57d7f939 MS |
225 | pgt_prot = pgprot_val(PAGE_KERNEL); |
226 | sgt_prot = pgprot_val(SEGMENT_KERNEL); | |
227 | if (!MACHINE_HAS_NX) { | |
228 | pgt_prot &= ~_PAGE_NOEXEC; | |
229 | sgt_prot &= ~_SEGMENT_ENTRY_NOEXEC; | |
230 | } | |
0aad818b | 231 | for (address = start; address < end;) { |
f4eb07c1 HC |
232 | pg_dir = pgd_offset_k(address); |
233 | if (pgd_none(*pg_dir)) { | |
a01ef308 | 234 | p4_dir = vmem_crst_alloc(_REGION2_ENTRY_EMPTY); |
1aea9b3f MS |
235 | if (!p4_dir) |
236 | goto out; | |
237 | pgd_populate(&init_mm, pg_dir, p4_dir); | |
238 | } | |
239 | ||
240 | p4_dir = p4d_offset(pg_dir, address); | |
241 | if (p4d_none(*p4_dir)) { | |
a01ef308 | 242 | pu_dir = vmem_crst_alloc(_REGION3_ENTRY_EMPTY); |
190a1d72 MS |
243 | if (!pu_dir) |
244 | goto out; | |
1aea9b3f | 245 | p4d_populate(&init_mm, p4_dir, pu_dir); |
190a1d72 MS |
246 | } |
247 | ||
1aea9b3f | 248 | pu_dir = pud_offset(p4_dir, address); |
190a1d72 | 249 | if (pud_none(*pu_dir)) { |
a01ef308 | 250 | pm_dir = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY); |
f4eb07c1 HC |
251 | if (!pm_dir) |
252 | goto out; | |
b2fa47e6 | 253 | pud_populate(&init_mm, pu_dir, pm_dir); |
f4eb07c1 HC |
254 | } |
255 | ||
190a1d72 | 256 | pm_dir = pmd_offset(pu_dir, address); |
f4eb07c1 | 257 | if (pmd_none(*pm_dir)) { |
f7817968 HC |
258 | /* Use 1MB frames for vmemmap if available. We always |
259 | * use large frames even if they are only partially | |
260 | * used. | |
261 | * Otherwise we would have also page tables since | |
262 | * vmemmap_populate gets called for each section | |
263 | * separately. */ | |
264 | if (MACHINE_HAS_EDAT1) { | |
265 | void *new_page; | |
266 | ||
267 | new_page = vmemmap_alloc_block(PMD_SIZE, node); | |
268 | if (!new_page) | |
269 | goto out; | |
57d7f939 | 270 | pmd_val(*pm_dir) = __pa(new_page) | sgt_prot; |
f7817968 HC |
271 | address = (address + PMD_SIZE) & PMD_MASK; |
272 | continue; | |
273 | } | |
c53db522 | 274 | pt_dir = vmem_pte_alloc(); |
f4eb07c1 HC |
275 | if (!pt_dir) |
276 | goto out; | |
b2fa47e6 | 277 | pmd_populate(&init_mm, pm_dir, pt_dir); |
f7817968 HC |
278 | } else if (pmd_large(*pm_dir)) { |
279 | address = (address + PMD_SIZE) & PMD_MASK; | |
280 | continue; | |
f4eb07c1 HC |
281 | } |
282 | ||
283 | pt_dir = pte_offset_kernel(pm_dir, address); | |
284 | if (pte_none(*pt_dir)) { | |
70c9d296 | 285 | void *new_page; |
f4eb07c1 | 286 | |
70c9d296 | 287 | new_page = vmemmap_alloc_block(PAGE_SIZE, node); |
f4eb07c1 HC |
288 | if (!new_page) |
289 | goto out; | |
57d7f939 | 290 | pte_val(*pt_dir) = __pa(new_page) | pgt_prot; |
f4eb07c1 | 291 | } |
f7817968 | 292 | address += PAGE_SIZE; |
f4eb07c1 HC |
293 | } |
294 | ret = 0; | |
295 | out: | |
f4eb07c1 HC |
296 | return ret; |
297 | } | |
298 | ||
0aad818b | 299 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
300 | { |
301 | } | |
302 | ||
f4eb07c1 HC |
303 | /* |
304 | * Add memory segment to the segment list if it doesn't overlap with | |
305 | * an already present segment. | |
306 | */ | |
307 | static int insert_memory_segment(struct memory_segment *seg) | |
308 | { | |
309 | struct memory_segment *tmp; | |
310 | ||
ee0ddadd | 311 | if (seg->start + seg->size > VMEM_MAX_PHYS || |
f4eb07c1 HC |
312 | seg->start + seg->size < seg->start) |
313 | return -ERANGE; | |
314 | ||
315 | list_for_each_entry(tmp, &mem_segs, list) { | |
316 | if (seg->start >= tmp->start + tmp->size) | |
317 | continue; | |
318 | if (seg->start + seg->size <= tmp->start) | |
319 | continue; | |
320 | return -ENOSPC; | |
321 | } | |
322 | list_add(&seg->list, &mem_segs); | |
323 | return 0; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Remove memory segment from the segment list. | |
328 | */ | |
329 | static void remove_memory_segment(struct memory_segment *seg) | |
330 | { | |
331 | list_del(&seg->list); | |
332 | } | |
333 | ||
334 | static void __remove_shared_memory(struct memory_segment *seg) | |
335 | { | |
336 | remove_memory_segment(seg); | |
337 | vmem_remove_range(seg->start, seg->size); | |
338 | } | |
339 | ||
17f34580 | 340 | int vmem_remove_mapping(unsigned long start, unsigned long size) |
f4eb07c1 HC |
341 | { |
342 | struct memory_segment *seg; | |
343 | int ret; | |
344 | ||
345 | mutex_lock(&vmem_mutex); | |
346 | ||
347 | ret = -ENOENT; | |
348 | list_for_each_entry(seg, &mem_segs, list) { | |
349 | if (seg->start == start && seg->size == size) | |
350 | break; | |
351 | } | |
352 | ||
353 | if (seg->start != start || seg->size != size) | |
354 | goto out; | |
355 | ||
356 | ret = 0; | |
357 | __remove_shared_memory(seg); | |
358 | kfree(seg); | |
359 | out: | |
360 | mutex_unlock(&vmem_mutex); | |
361 | return ret; | |
362 | } | |
363 | ||
17f34580 | 364 | int vmem_add_mapping(unsigned long start, unsigned long size) |
f4eb07c1 HC |
365 | { |
366 | struct memory_segment *seg; | |
f4eb07c1 HC |
367 | int ret; |
368 | ||
369 | mutex_lock(&vmem_mutex); | |
370 | ret = -ENOMEM; | |
371 | seg = kzalloc(sizeof(*seg), GFP_KERNEL); | |
372 | if (!seg) | |
373 | goto out; | |
374 | seg->start = start; | |
375 | seg->size = size; | |
376 | ||
377 | ret = insert_memory_segment(seg); | |
378 | if (ret) | |
379 | goto out_free; | |
380 | ||
bab247ff | 381 | ret = vmem_add_mem(start, size); |
f4eb07c1 HC |
382 | if (ret) |
383 | goto out_remove; | |
f4eb07c1 HC |
384 | goto out; |
385 | ||
386 | out_remove: | |
387 | __remove_shared_memory(seg); | |
388 | out_free: | |
389 | kfree(seg); | |
390 | out: | |
391 | mutex_unlock(&vmem_mutex); | |
392 | return ret; | |
393 | } | |
394 | ||
395 | /* | |
396 | * map whole physical memory to virtual memory (identity mapping) | |
5fd9c6e2 CB |
397 | * we reserve enough space in the vmalloc area for vmemmap to hotplug |
398 | * additional memory segments. | |
f4eb07c1 HC |
399 | */ |
400 | void __init vmem_map_init(void) | |
401 | { | |
50be6345 | 402 | struct memblock_region *reg; |
f4eb07c1 | 403 | |
bab247ff HC |
404 | for_each_memblock(memory, reg) |
405 | vmem_add_mem(reg->base, reg->size); | |
57d7f939 MS |
406 | __set_memory((unsigned long) _stext, |
407 | (_etext - _stext) >> PAGE_SHIFT, | |
408 | SET_MEMORY_RO | SET_MEMORY_X); | |
409 | __set_memory((unsigned long) _etext, | |
410 | (_eshared - _etext) >> PAGE_SHIFT, | |
411 | SET_MEMORY_RO); | |
412 | __set_memory((unsigned long) _sinittext, | |
413 | (_einittext - _sinittext) >> PAGE_SHIFT, | |
414 | SET_MEMORY_RO | SET_MEMORY_X); | |
415 | pr_info("Write protected kernel read-only data: %luk\n", | |
416 | (_eshared - _stext) >> 10); | |
f4eb07c1 HC |
417 | } |
418 | ||
419 | /* | |
50be6345 PH |
420 | * Convert memblock.memory to a memory segment list so there is a single |
421 | * list that contains all memory segments. | |
f4eb07c1 HC |
422 | */ |
423 | static int __init vmem_convert_memory_chunk(void) | |
424 | { | |
50be6345 | 425 | struct memblock_region *reg; |
f4eb07c1 | 426 | struct memory_segment *seg; |
f4eb07c1 HC |
427 | |
428 | mutex_lock(&vmem_mutex); | |
50be6345 | 429 | for_each_memblock(memory, reg) { |
f4eb07c1 HC |
430 | seg = kzalloc(sizeof(*seg), GFP_KERNEL); |
431 | if (!seg) | |
432 | panic("Out of memory...\n"); | |
50be6345 PH |
433 | seg->start = reg->base; |
434 | seg->size = reg->size; | |
f4eb07c1 HC |
435 | insert_memory_segment(seg); |
436 | } | |
437 | mutex_unlock(&vmem_mutex); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | core_initcall(vmem_convert_memory_chunk); |