Commit | Line | Data |
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f4eb07c1 HC |
1 | /* |
2 | * arch/s390/mm/vmem.c | |
3 | * | |
4 | * Copyright IBM Corp. 2006 | |
5 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> | |
6 | */ | |
7 | ||
8 | #include <linux/bootmem.h> | |
9 | #include <linux/pfn.h> | |
10 | #include <linux/mm.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/list.h> | |
53492b1d | 13 | #include <linux/hugetlb.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
f4eb07c1 HC |
15 | #include <asm/pgalloc.h> |
16 | #include <asm/pgtable.h> | |
17 | #include <asm/setup.h> | |
18 | #include <asm/tlbflush.h> | |
53492b1d | 19 | #include <asm/sections.h> |
f4eb07c1 | 20 | |
f4eb07c1 HC |
21 | static DEFINE_MUTEX(vmem_mutex); |
22 | ||
23 | struct memory_segment { | |
24 | struct list_head list; | |
25 | unsigned long start; | |
26 | unsigned long size; | |
27 | }; | |
28 | ||
29 | static LIST_HEAD(mem_segs); | |
30 | ||
67060d9c HC |
31 | static void __ref *vmem_alloc_pages(unsigned int order) |
32 | { | |
33 | if (slab_is_available()) | |
34 | return (void *)__get_free_pages(GFP_KERNEL, order); | |
35 | return alloc_bootmem_pages((1 << order) * PAGE_SIZE); | |
36 | } | |
37 | ||
38 | static inline pud_t *vmem_pud_alloc(void) | |
5a216a20 MS |
39 | { |
40 | pud_t *pud = NULL; | |
41 | ||
42 | #ifdef CONFIG_64BIT | |
67060d9c | 43 | pud = vmem_alloc_pages(2); |
5a216a20 MS |
44 | if (!pud) |
45 | return NULL; | |
8fc63658 | 46 | clear_table((unsigned long *) pud, _REGION3_ENTRY_EMPTY, PAGE_SIZE * 4); |
5a216a20 MS |
47 | #endif |
48 | return pud; | |
49 | } | |
190a1d72 | 50 | |
67060d9c | 51 | static inline pmd_t *vmem_pmd_alloc(void) |
f4eb07c1 | 52 | { |
3610cce8 | 53 | pmd_t *pmd = NULL; |
f4eb07c1 | 54 | |
3610cce8 | 55 | #ifdef CONFIG_64BIT |
67060d9c | 56 | pmd = vmem_alloc_pages(2); |
f4eb07c1 HC |
57 | if (!pmd) |
58 | return NULL; | |
8fc63658 | 59 | clear_table((unsigned long *) pmd, _SEGMENT_ENTRY_EMPTY, PAGE_SIZE * 4); |
3610cce8 | 60 | #endif |
f4eb07c1 HC |
61 | return pmd; |
62 | } | |
63 | ||
2069e978 | 64 | static pte_t __ref *vmem_pte_alloc(void) |
f4eb07c1 | 65 | { |
146e4b3c | 66 | pte_t *pte; |
f4eb07c1 | 67 | |
146e4b3c MS |
68 | if (slab_is_available()) |
69 | pte = (pte_t *) page_table_alloc(&init_mm); | |
70 | else | |
71 | pte = alloc_bootmem(PTRS_PER_PTE * sizeof(pte_t)); | |
f4eb07c1 HC |
72 | if (!pte) |
73 | return NULL; | |
6af7eea2 CB |
74 | clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY, |
75 | PTRS_PER_PTE * sizeof(pte_t)); | |
f4eb07c1 HC |
76 | return pte; |
77 | } | |
78 | ||
79 | /* | |
80 | * Add a physical memory range to the 1:1 mapping. | |
81 | */ | |
17f34580 | 82 | static int vmem_add_mem(unsigned long start, unsigned long size, int ro) |
f4eb07c1 HC |
83 | { |
84 | unsigned long address; | |
85 | pgd_t *pg_dir; | |
190a1d72 | 86 | pud_t *pu_dir; |
f4eb07c1 HC |
87 | pmd_t *pm_dir; |
88 | pte_t *pt_dir; | |
89 | pte_t pte; | |
90 | int ret = -ENOMEM; | |
91 | ||
92 | for (address = start; address < start + size; address += PAGE_SIZE) { | |
93 | pg_dir = pgd_offset_k(address); | |
94 | if (pgd_none(*pg_dir)) { | |
190a1d72 MS |
95 | pu_dir = vmem_pud_alloc(); |
96 | if (!pu_dir) | |
97 | goto out; | |
98 | pgd_populate_kernel(&init_mm, pg_dir, pu_dir); | |
99 | } | |
100 | ||
101 | pu_dir = pud_offset(pg_dir, address); | |
102 | if (pud_none(*pu_dir)) { | |
f4eb07c1 HC |
103 | pm_dir = vmem_pmd_alloc(); |
104 | if (!pm_dir) | |
105 | goto out; | |
190a1d72 | 106 | pud_populate_kernel(&init_mm, pu_dir, pm_dir); |
f4eb07c1 HC |
107 | } |
108 | ||
53492b1d | 109 | pte = mk_pte_phys(address, __pgprot(ro ? _PAGE_RO : 0)); |
190a1d72 | 110 | pm_dir = pmd_offset(pu_dir, address); |
53492b1d GS |
111 | |
112 | #ifdef __s390x__ | |
113 | if (MACHINE_HAS_HPAGE && !(address & ~HPAGE_MASK) && | |
114 | (address + HPAGE_SIZE <= start + size) && | |
115 | (address >= HPAGE_SIZE)) { | |
6af7eea2 | 116 | pte_val(pte) |= _SEGMENT_ENTRY_LARGE; |
53492b1d GS |
117 | pmd_val(*pm_dir) = pte_val(pte); |
118 | address += HPAGE_SIZE - PAGE_SIZE; | |
119 | continue; | |
120 | } | |
121 | #endif | |
f4eb07c1 HC |
122 | if (pmd_none(*pm_dir)) { |
123 | pt_dir = vmem_pte_alloc(); | |
124 | if (!pt_dir) | |
125 | goto out; | |
126 | pmd_populate_kernel(&init_mm, pm_dir, pt_dir); | |
127 | } | |
128 | ||
129 | pt_dir = pte_offset_kernel(pm_dir, address); | |
c1821c2e | 130 | *pt_dir = pte; |
f4eb07c1 HC |
131 | } |
132 | ret = 0; | |
133 | out: | |
134 | flush_tlb_kernel_range(start, start + size); | |
135 | return ret; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Remove a physical memory range from the 1:1 mapping. | |
140 | * Currently only invalidates page table entries. | |
141 | */ | |
142 | static void vmem_remove_range(unsigned long start, unsigned long size) | |
143 | { | |
144 | unsigned long address; | |
145 | pgd_t *pg_dir; | |
190a1d72 | 146 | pud_t *pu_dir; |
f4eb07c1 HC |
147 | pmd_t *pm_dir; |
148 | pte_t *pt_dir; | |
149 | pte_t pte; | |
150 | ||
151 | pte_val(pte) = _PAGE_TYPE_EMPTY; | |
152 | for (address = start; address < start + size; address += PAGE_SIZE) { | |
153 | pg_dir = pgd_offset_k(address); | |
190a1d72 MS |
154 | pu_dir = pud_offset(pg_dir, address); |
155 | if (pud_none(*pu_dir)) | |
f4eb07c1 | 156 | continue; |
190a1d72 | 157 | pm_dir = pmd_offset(pu_dir, address); |
f4eb07c1 HC |
158 | if (pmd_none(*pm_dir)) |
159 | continue; | |
53492b1d GS |
160 | |
161 | if (pmd_huge(*pm_dir)) { | |
162 | pmd_clear_kernel(pm_dir); | |
163 | address += HPAGE_SIZE - PAGE_SIZE; | |
164 | continue; | |
165 | } | |
166 | ||
f4eb07c1 | 167 | pt_dir = pte_offset_kernel(pm_dir, address); |
c1821c2e | 168 | *pt_dir = pte; |
f4eb07c1 HC |
169 | } |
170 | flush_tlb_kernel_range(start, start + size); | |
171 | } | |
172 | ||
173 | /* | |
174 | * Add a backed mem_map array to the virtual mem_map array. | |
175 | */ | |
17f34580 | 176 | int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node) |
f4eb07c1 HC |
177 | { |
178 | unsigned long address, start_addr, end_addr; | |
f4eb07c1 | 179 | pgd_t *pg_dir; |
190a1d72 | 180 | pud_t *pu_dir; |
f4eb07c1 HC |
181 | pmd_t *pm_dir; |
182 | pte_t *pt_dir; | |
183 | pte_t pte; | |
184 | int ret = -ENOMEM; | |
185 | ||
17f34580 HC |
186 | start_addr = (unsigned long) start; |
187 | end_addr = (unsigned long) (start + nr); | |
f4eb07c1 HC |
188 | |
189 | for (address = start_addr; address < end_addr; address += PAGE_SIZE) { | |
190 | pg_dir = pgd_offset_k(address); | |
191 | if (pgd_none(*pg_dir)) { | |
190a1d72 MS |
192 | pu_dir = vmem_pud_alloc(); |
193 | if (!pu_dir) | |
194 | goto out; | |
195 | pgd_populate_kernel(&init_mm, pg_dir, pu_dir); | |
196 | } | |
197 | ||
198 | pu_dir = pud_offset(pg_dir, address); | |
199 | if (pud_none(*pu_dir)) { | |
f4eb07c1 HC |
200 | pm_dir = vmem_pmd_alloc(); |
201 | if (!pm_dir) | |
202 | goto out; | |
190a1d72 | 203 | pud_populate_kernel(&init_mm, pu_dir, pm_dir); |
f4eb07c1 HC |
204 | } |
205 | ||
190a1d72 | 206 | pm_dir = pmd_offset(pu_dir, address); |
f4eb07c1 HC |
207 | if (pmd_none(*pm_dir)) { |
208 | pt_dir = vmem_pte_alloc(); | |
209 | if (!pt_dir) | |
210 | goto out; | |
211 | pmd_populate_kernel(&init_mm, pm_dir, pt_dir); | |
212 | } | |
213 | ||
214 | pt_dir = pte_offset_kernel(pm_dir, address); | |
215 | if (pte_none(*pt_dir)) { | |
216 | unsigned long new_page; | |
217 | ||
67060d9c | 218 | new_page =__pa(vmem_alloc_pages(0)); |
f4eb07c1 HC |
219 | if (!new_page) |
220 | goto out; | |
221 | pte = pfn_pte(new_page >> PAGE_SHIFT, PAGE_KERNEL); | |
c1821c2e | 222 | *pt_dir = pte; |
f4eb07c1 HC |
223 | } |
224 | } | |
67060d9c | 225 | memset(start, 0, nr * sizeof(struct page)); |
f4eb07c1 HC |
226 | ret = 0; |
227 | out: | |
228 | flush_tlb_kernel_range(start_addr, end_addr); | |
229 | return ret; | |
230 | } | |
231 | ||
f4eb07c1 HC |
232 | /* |
233 | * Add memory segment to the segment list if it doesn't overlap with | |
234 | * an already present segment. | |
235 | */ | |
236 | static int insert_memory_segment(struct memory_segment *seg) | |
237 | { | |
238 | struct memory_segment *tmp; | |
239 | ||
ee0ddadd | 240 | if (seg->start + seg->size > VMEM_MAX_PHYS || |
f4eb07c1 HC |
241 | seg->start + seg->size < seg->start) |
242 | return -ERANGE; | |
243 | ||
244 | list_for_each_entry(tmp, &mem_segs, list) { | |
245 | if (seg->start >= tmp->start + tmp->size) | |
246 | continue; | |
247 | if (seg->start + seg->size <= tmp->start) | |
248 | continue; | |
249 | return -ENOSPC; | |
250 | } | |
251 | list_add(&seg->list, &mem_segs); | |
252 | return 0; | |
253 | } | |
254 | ||
255 | /* | |
256 | * Remove memory segment from the segment list. | |
257 | */ | |
258 | static void remove_memory_segment(struct memory_segment *seg) | |
259 | { | |
260 | list_del(&seg->list); | |
261 | } | |
262 | ||
263 | static void __remove_shared_memory(struct memory_segment *seg) | |
264 | { | |
265 | remove_memory_segment(seg); | |
266 | vmem_remove_range(seg->start, seg->size); | |
267 | } | |
268 | ||
17f34580 | 269 | int vmem_remove_mapping(unsigned long start, unsigned long size) |
f4eb07c1 HC |
270 | { |
271 | struct memory_segment *seg; | |
272 | int ret; | |
273 | ||
274 | mutex_lock(&vmem_mutex); | |
275 | ||
276 | ret = -ENOENT; | |
277 | list_for_each_entry(seg, &mem_segs, list) { | |
278 | if (seg->start == start && seg->size == size) | |
279 | break; | |
280 | } | |
281 | ||
282 | if (seg->start != start || seg->size != size) | |
283 | goto out; | |
284 | ||
285 | ret = 0; | |
286 | __remove_shared_memory(seg); | |
287 | kfree(seg); | |
288 | out: | |
289 | mutex_unlock(&vmem_mutex); | |
290 | return ret; | |
291 | } | |
292 | ||
17f34580 | 293 | int vmem_add_mapping(unsigned long start, unsigned long size) |
f4eb07c1 HC |
294 | { |
295 | struct memory_segment *seg; | |
f4eb07c1 HC |
296 | int ret; |
297 | ||
298 | mutex_lock(&vmem_mutex); | |
299 | ret = -ENOMEM; | |
300 | seg = kzalloc(sizeof(*seg), GFP_KERNEL); | |
301 | if (!seg) | |
302 | goto out; | |
303 | seg->start = start; | |
304 | seg->size = size; | |
305 | ||
306 | ret = insert_memory_segment(seg); | |
307 | if (ret) | |
308 | goto out_free; | |
309 | ||
53492b1d | 310 | ret = vmem_add_mem(start, size, 0); |
f4eb07c1 HC |
311 | if (ret) |
312 | goto out_remove; | |
f4eb07c1 HC |
313 | goto out; |
314 | ||
315 | out_remove: | |
316 | __remove_shared_memory(seg); | |
317 | out_free: | |
318 | kfree(seg); | |
319 | out: | |
320 | mutex_unlock(&vmem_mutex); | |
321 | return ret; | |
322 | } | |
323 | ||
324 | /* | |
325 | * map whole physical memory to virtual memory (identity mapping) | |
5fd9c6e2 CB |
326 | * we reserve enough space in the vmalloc area for vmemmap to hotplug |
327 | * additional memory segments. | |
f4eb07c1 HC |
328 | */ |
329 | void __init vmem_map_init(void) | |
330 | { | |
53492b1d GS |
331 | unsigned long ro_start, ro_end; |
332 | unsigned long start, end; | |
f4eb07c1 HC |
333 | int i; |
334 | ||
53492b1d GS |
335 | ro_start = ((unsigned long)&_stext) & PAGE_MASK; |
336 | ro_end = PFN_ALIGN((unsigned long)&_eshared); | |
337 | for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { | |
338 | start = memory_chunk[i].addr; | |
339 | end = memory_chunk[i].addr + memory_chunk[i].size; | |
340 | if (start >= ro_end || end <= ro_start) | |
341 | vmem_add_mem(start, end - start, 0); | |
342 | else if (start >= ro_start && end <= ro_end) | |
343 | vmem_add_mem(start, end - start, 1); | |
344 | else if (start >= ro_start) { | |
345 | vmem_add_mem(start, ro_end - start, 1); | |
346 | vmem_add_mem(ro_end, end - ro_end, 0); | |
347 | } else if (end < ro_end) { | |
348 | vmem_add_mem(start, ro_start - start, 0); | |
349 | vmem_add_mem(ro_start, end - ro_start, 1); | |
350 | } else { | |
351 | vmem_add_mem(start, ro_start - start, 0); | |
352 | vmem_add_mem(ro_start, ro_end - ro_start, 1); | |
353 | vmem_add_mem(ro_end, end - ro_end, 0); | |
354 | } | |
355 | } | |
f4eb07c1 HC |
356 | } |
357 | ||
358 | /* | |
359 | * Convert memory chunk array to a memory segment list so there is a single | |
360 | * list that contains both r/w memory and shared memory segments. | |
361 | */ | |
362 | static int __init vmem_convert_memory_chunk(void) | |
363 | { | |
364 | struct memory_segment *seg; | |
365 | int i; | |
366 | ||
367 | mutex_lock(&vmem_mutex); | |
9f4b0ba8 | 368 | for (i = 0; i < MEMORY_CHUNKS; i++) { |
f4eb07c1 HC |
369 | if (!memory_chunk[i].size) |
370 | continue; | |
371 | seg = kzalloc(sizeof(*seg), GFP_KERNEL); | |
372 | if (!seg) | |
373 | panic("Out of memory...\n"); | |
374 | seg->start = memory_chunk[i].addr; | |
375 | seg->size = memory_chunk[i].size; | |
376 | insert_memory_segment(seg); | |
377 | } | |
378 | mutex_unlock(&vmem_mutex); | |
379 | return 0; | |
380 | } | |
381 | ||
382 | core_initcall(vmem_convert_memory_chunk); |