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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> |
f4eb07c1 HC |
14 | #include <asm/pgalloc.h> |
15 | #include <asm/pgtable.h> | |
16 | #include <asm/setup.h> | |
17 | #include <asm/tlbflush.h> | |
53492b1d | 18 | #include <asm/sections.h> |
f4eb07c1 | 19 | |
f4eb07c1 HC |
20 | static DEFINE_MUTEX(vmem_mutex); |
21 | ||
22 | struct memory_segment { | |
23 | struct list_head list; | |
24 | unsigned long start; | |
25 | unsigned long size; | |
26 | }; | |
27 | ||
28 | static LIST_HEAD(mem_segs); | |
29 | ||
2069e978 | 30 | static pud_t *vmem_pud_alloc(void) |
5a216a20 MS |
31 | { |
32 | pud_t *pud = NULL; | |
33 | ||
34 | #ifdef CONFIG_64BIT | |
2069e978 | 35 | pud = vmemmap_alloc_block(PAGE_SIZE * 4, 0); |
5a216a20 MS |
36 | if (!pud) |
37 | return NULL; | |
8fc63658 | 38 | clear_table((unsigned long *) pud, _REGION3_ENTRY_EMPTY, PAGE_SIZE * 4); |
5a216a20 MS |
39 | #endif |
40 | return pud; | |
41 | } | |
190a1d72 | 42 | |
2069e978 | 43 | static pmd_t *vmem_pmd_alloc(void) |
f4eb07c1 | 44 | { |
3610cce8 | 45 | pmd_t *pmd = NULL; |
f4eb07c1 | 46 | |
3610cce8 | 47 | #ifdef CONFIG_64BIT |
2069e978 | 48 | pmd = vmemmap_alloc_block(PAGE_SIZE * 4, 0); |
f4eb07c1 HC |
49 | if (!pmd) |
50 | return NULL; | |
8fc63658 | 51 | clear_table((unsigned long *) pmd, _SEGMENT_ENTRY_EMPTY, PAGE_SIZE * 4); |
3610cce8 | 52 | #endif |
f4eb07c1 HC |
53 | return pmd; |
54 | } | |
55 | ||
2069e978 | 56 | static pte_t __ref *vmem_pte_alloc(void) |
f4eb07c1 | 57 | { |
146e4b3c | 58 | pte_t *pte; |
f4eb07c1 | 59 | |
146e4b3c MS |
60 | if (slab_is_available()) |
61 | pte = (pte_t *) page_table_alloc(&init_mm); | |
62 | else | |
63 | pte = alloc_bootmem(PTRS_PER_PTE * sizeof(pte_t)); | |
f4eb07c1 HC |
64 | if (!pte) |
65 | return NULL; | |
146e4b3c MS |
66 | clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY, |
67 | PTRS_PER_PTE * sizeof(pte_t)); | |
f4eb07c1 HC |
68 | return pte; |
69 | } | |
70 | ||
71 | /* | |
72 | * Add a physical memory range to the 1:1 mapping. | |
73 | */ | |
17f34580 | 74 | static int vmem_add_mem(unsigned long start, unsigned long size, int ro) |
f4eb07c1 HC |
75 | { |
76 | unsigned long address; | |
77 | pgd_t *pg_dir; | |
190a1d72 | 78 | pud_t *pu_dir; |
f4eb07c1 HC |
79 | pmd_t *pm_dir; |
80 | pte_t *pt_dir; | |
81 | pte_t pte; | |
82 | int ret = -ENOMEM; | |
83 | ||
84 | for (address = start; address < start + size; address += PAGE_SIZE) { | |
85 | pg_dir = pgd_offset_k(address); | |
86 | if (pgd_none(*pg_dir)) { | |
190a1d72 MS |
87 | pu_dir = vmem_pud_alloc(); |
88 | if (!pu_dir) | |
89 | goto out; | |
90 | pgd_populate_kernel(&init_mm, pg_dir, pu_dir); | |
91 | } | |
92 | ||
93 | pu_dir = pud_offset(pg_dir, address); | |
94 | if (pud_none(*pu_dir)) { | |
f4eb07c1 HC |
95 | pm_dir = vmem_pmd_alloc(); |
96 | if (!pm_dir) | |
97 | goto out; | |
190a1d72 | 98 | pud_populate_kernel(&init_mm, pu_dir, pm_dir); |
f4eb07c1 HC |
99 | } |
100 | ||
53492b1d | 101 | pte = mk_pte_phys(address, __pgprot(ro ? _PAGE_RO : 0)); |
190a1d72 | 102 | pm_dir = pmd_offset(pu_dir, address); |
53492b1d GS |
103 | |
104 | #ifdef __s390x__ | |
105 | if (MACHINE_HAS_HPAGE && !(address & ~HPAGE_MASK) && | |
106 | (address + HPAGE_SIZE <= start + size) && | |
107 | (address >= HPAGE_SIZE)) { | |
108 | pte_val(pte) |= _SEGMENT_ENTRY_LARGE; | |
109 | pmd_val(*pm_dir) = pte_val(pte); | |
110 | address += HPAGE_SIZE - PAGE_SIZE; | |
111 | continue; | |
112 | } | |
113 | #endif | |
f4eb07c1 HC |
114 | if (pmd_none(*pm_dir)) { |
115 | pt_dir = vmem_pte_alloc(); | |
116 | if (!pt_dir) | |
117 | goto out; | |
118 | pmd_populate_kernel(&init_mm, pm_dir, pt_dir); | |
119 | } | |
120 | ||
121 | pt_dir = pte_offset_kernel(pm_dir, address); | |
c1821c2e | 122 | *pt_dir = pte; |
f4eb07c1 HC |
123 | } |
124 | ret = 0; | |
125 | out: | |
126 | flush_tlb_kernel_range(start, start + size); | |
127 | return ret; | |
128 | } | |
129 | ||
130 | /* | |
131 | * Remove a physical memory range from the 1:1 mapping. | |
132 | * Currently only invalidates page table entries. | |
133 | */ | |
134 | static void vmem_remove_range(unsigned long start, unsigned long size) | |
135 | { | |
136 | unsigned long address; | |
137 | pgd_t *pg_dir; | |
190a1d72 | 138 | pud_t *pu_dir; |
f4eb07c1 HC |
139 | pmd_t *pm_dir; |
140 | pte_t *pt_dir; | |
141 | pte_t pte; | |
142 | ||
143 | pte_val(pte) = _PAGE_TYPE_EMPTY; | |
144 | for (address = start; address < start + size; address += PAGE_SIZE) { | |
145 | pg_dir = pgd_offset_k(address); | |
190a1d72 MS |
146 | pu_dir = pud_offset(pg_dir, address); |
147 | if (pud_none(*pu_dir)) | |
f4eb07c1 | 148 | continue; |
190a1d72 | 149 | pm_dir = pmd_offset(pu_dir, address); |
f4eb07c1 HC |
150 | if (pmd_none(*pm_dir)) |
151 | continue; | |
53492b1d GS |
152 | |
153 | if (pmd_huge(*pm_dir)) { | |
154 | pmd_clear_kernel(pm_dir); | |
155 | address += HPAGE_SIZE - PAGE_SIZE; | |
156 | continue; | |
157 | } | |
158 | ||
f4eb07c1 | 159 | pt_dir = pte_offset_kernel(pm_dir, address); |
c1821c2e | 160 | *pt_dir = pte; |
f4eb07c1 HC |
161 | } |
162 | flush_tlb_kernel_range(start, start + size); | |
163 | } | |
164 | ||
165 | /* | |
166 | * Add a backed mem_map array to the virtual mem_map array. | |
167 | */ | |
17f34580 | 168 | int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node) |
f4eb07c1 HC |
169 | { |
170 | unsigned long address, start_addr, end_addr; | |
f4eb07c1 | 171 | pgd_t *pg_dir; |
190a1d72 | 172 | pud_t *pu_dir; |
f4eb07c1 HC |
173 | pmd_t *pm_dir; |
174 | pte_t *pt_dir; | |
175 | pte_t pte; | |
176 | int ret = -ENOMEM; | |
177 | ||
17f34580 HC |
178 | start_addr = (unsigned long) start; |
179 | end_addr = (unsigned long) (start + nr); | |
f4eb07c1 HC |
180 | |
181 | for (address = start_addr; address < end_addr; address += PAGE_SIZE) { | |
182 | pg_dir = pgd_offset_k(address); | |
183 | if (pgd_none(*pg_dir)) { | |
190a1d72 MS |
184 | pu_dir = vmem_pud_alloc(); |
185 | if (!pu_dir) | |
186 | goto out; | |
187 | pgd_populate_kernel(&init_mm, pg_dir, pu_dir); | |
188 | } | |
189 | ||
190 | pu_dir = pud_offset(pg_dir, address); | |
191 | if (pud_none(*pu_dir)) { | |
f4eb07c1 HC |
192 | pm_dir = vmem_pmd_alloc(); |
193 | if (!pm_dir) | |
194 | goto out; | |
190a1d72 | 195 | pud_populate_kernel(&init_mm, pu_dir, pm_dir); |
f4eb07c1 HC |
196 | } |
197 | ||
190a1d72 | 198 | pm_dir = pmd_offset(pu_dir, address); |
f4eb07c1 HC |
199 | if (pmd_none(*pm_dir)) { |
200 | pt_dir = vmem_pte_alloc(); | |
201 | if (!pt_dir) | |
202 | goto out; | |
203 | pmd_populate_kernel(&init_mm, pm_dir, pt_dir); | |
204 | } | |
205 | ||
206 | pt_dir = pte_offset_kernel(pm_dir, address); | |
207 | if (pte_none(*pt_dir)) { | |
208 | unsigned long new_page; | |
209 | ||
2069e978 | 210 | new_page =__pa(vmemmap_alloc_block(PAGE_SIZE, 0)); |
f4eb07c1 HC |
211 | if (!new_page) |
212 | goto out; | |
213 | pte = pfn_pte(new_page >> PAGE_SHIFT, PAGE_KERNEL); | |
c1821c2e | 214 | *pt_dir = pte; |
f4eb07c1 HC |
215 | } |
216 | } | |
217 | ret = 0; | |
218 | out: | |
219 | flush_tlb_kernel_range(start_addr, end_addr); | |
220 | return ret; | |
221 | } | |
222 | ||
f4eb07c1 HC |
223 | /* |
224 | * Add memory segment to the segment list if it doesn't overlap with | |
225 | * an already present segment. | |
226 | */ | |
227 | static int insert_memory_segment(struct memory_segment *seg) | |
228 | { | |
229 | struct memory_segment *tmp; | |
230 | ||
0189103c | 231 | if (seg->start + seg->size >= VMEM_MAX_PHYS || |
f4eb07c1 HC |
232 | seg->start + seg->size < seg->start) |
233 | return -ERANGE; | |
234 | ||
235 | list_for_each_entry(tmp, &mem_segs, list) { | |
236 | if (seg->start >= tmp->start + tmp->size) | |
237 | continue; | |
238 | if (seg->start + seg->size <= tmp->start) | |
239 | continue; | |
240 | return -ENOSPC; | |
241 | } | |
242 | list_add(&seg->list, &mem_segs); | |
243 | return 0; | |
244 | } | |
245 | ||
246 | /* | |
247 | * Remove memory segment from the segment list. | |
248 | */ | |
249 | static void remove_memory_segment(struct memory_segment *seg) | |
250 | { | |
251 | list_del(&seg->list); | |
252 | } | |
253 | ||
254 | static void __remove_shared_memory(struct memory_segment *seg) | |
255 | { | |
256 | remove_memory_segment(seg); | |
257 | vmem_remove_range(seg->start, seg->size); | |
258 | } | |
259 | ||
17f34580 | 260 | int vmem_remove_mapping(unsigned long start, unsigned long size) |
f4eb07c1 HC |
261 | { |
262 | struct memory_segment *seg; | |
263 | int ret; | |
264 | ||
265 | mutex_lock(&vmem_mutex); | |
266 | ||
267 | ret = -ENOENT; | |
268 | list_for_each_entry(seg, &mem_segs, list) { | |
269 | if (seg->start == start && seg->size == size) | |
270 | break; | |
271 | } | |
272 | ||
273 | if (seg->start != start || seg->size != size) | |
274 | goto out; | |
275 | ||
276 | ret = 0; | |
277 | __remove_shared_memory(seg); | |
278 | kfree(seg); | |
279 | out: | |
280 | mutex_unlock(&vmem_mutex); | |
281 | return ret; | |
282 | } | |
283 | ||
17f34580 | 284 | int vmem_add_mapping(unsigned long start, unsigned long size) |
f4eb07c1 HC |
285 | { |
286 | struct memory_segment *seg; | |
f4eb07c1 HC |
287 | int ret; |
288 | ||
289 | mutex_lock(&vmem_mutex); | |
290 | ret = -ENOMEM; | |
291 | seg = kzalloc(sizeof(*seg), GFP_KERNEL); | |
292 | if (!seg) | |
293 | goto out; | |
294 | seg->start = start; | |
295 | seg->size = size; | |
296 | ||
297 | ret = insert_memory_segment(seg); | |
298 | if (ret) | |
299 | goto out_free; | |
300 | ||
53492b1d | 301 | ret = vmem_add_mem(start, size, 0); |
f4eb07c1 HC |
302 | if (ret) |
303 | goto out_remove; | |
f4eb07c1 HC |
304 | goto out; |
305 | ||
306 | out_remove: | |
307 | __remove_shared_memory(seg); | |
308 | out_free: | |
309 | kfree(seg); | |
310 | out: | |
311 | mutex_unlock(&vmem_mutex); | |
312 | return ret; | |
313 | } | |
314 | ||
315 | /* | |
316 | * map whole physical memory to virtual memory (identity mapping) | |
5fd9c6e2 CB |
317 | * we reserve enough space in the vmalloc area for vmemmap to hotplug |
318 | * additional memory segments. | |
f4eb07c1 HC |
319 | */ |
320 | void __init vmem_map_init(void) | |
321 | { | |
53492b1d GS |
322 | unsigned long ro_start, ro_end; |
323 | unsigned long start, end; | |
f4eb07c1 HC |
324 | int i; |
325 | ||
146e4b3c MS |
326 | INIT_LIST_HEAD(&init_mm.context.crst_list); |
327 | INIT_LIST_HEAD(&init_mm.context.pgtable_list); | |
328 | init_mm.context.noexec = 0; | |
53492b1d GS |
329 | ro_start = ((unsigned long)&_stext) & PAGE_MASK; |
330 | ro_end = PFN_ALIGN((unsigned long)&_eshared); | |
331 | for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { | |
332 | start = memory_chunk[i].addr; | |
333 | end = memory_chunk[i].addr + memory_chunk[i].size; | |
334 | if (start >= ro_end || end <= ro_start) | |
335 | vmem_add_mem(start, end - start, 0); | |
336 | else if (start >= ro_start && end <= ro_end) | |
337 | vmem_add_mem(start, end - start, 1); | |
338 | else if (start >= ro_start) { | |
339 | vmem_add_mem(start, ro_end - start, 1); | |
340 | vmem_add_mem(ro_end, end - ro_end, 0); | |
341 | } else if (end < ro_end) { | |
342 | vmem_add_mem(start, ro_start - start, 0); | |
343 | vmem_add_mem(ro_start, end - ro_start, 1); | |
344 | } else { | |
345 | vmem_add_mem(start, ro_start - start, 0); | |
346 | vmem_add_mem(ro_start, ro_end - ro_start, 1); | |
347 | vmem_add_mem(ro_end, end - ro_end, 0); | |
348 | } | |
349 | } | |
f4eb07c1 HC |
350 | } |
351 | ||
352 | /* | |
353 | * Convert memory chunk array to a memory segment list so there is a single | |
354 | * list that contains both r/w memory and shared memory segments. | |
355 | */ | |
356 | static int __init vmem_convert_memory_chunk(void) | |
357 | { | |
358 | struct memory_segment *seg; | |
359 | int i; | |
360 | ||
361 | mutex_lock(&vmem_mutex); | |
9f4b0ba8 | 362 | for (i = 0; i < MEMORY_CHUNKS; i++) { |
f4eb07c1 HC |
363 | if (!memory_chunk[i].size) |
364 | continue; | |
365 | seg = kzalloc(sizeof(*seg), GFP_KERNEL); | |
366 | if (!seg) | |
367 | panic("Out of memory...\n"); | |
368 | seg->start = memory_chunk[i].addr; | |
369 | seg->size = memory_chunk[i].size; | |
370 | insert_memory_segment(seg); | |
371 | } | |
372 | mutex_unlock(&vmem_mutex); | |
373 | return 0; | |
374 | } | |
375 | ||
376 | core_initcall(vmem_convert_memory_chunk); |