Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 | 3 | * S390 version |
a53c8fab | 4 | * Copyright IBM Corp. 1999 |
1da177e4 LT |
5 | * Author(s): Hartmut Penner (hp@de.ibm.com) |
6 | * | |
7 | * Derived from "arch/i386/mm/init.c" | |
8 | * Copyright (C) 1995 Linus Torvalds | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/signal.h> |
12 | #include <linux/sched.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/ptrace.h> | |
18 | #include <linux/mman.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/swap.h> | |
64e1f0c5 | 21 | #include <linux/swiotlb.h> |
1da177e4 LT |
22 | #include <linux/smp.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/pagemap.h> | |
57c8a661 | 25 | #include <linux/memblock.h> |
e5d709bb | 26 | #include <linux/memory.h> |
d882b172 | 27 | #include <linux/pfn.h> |
028d9b3c | 28 | #include <linux/poison.h> |
2b67fc46 | 29 | #include <linux/initrd.h> |
3a4c5d59 | 30 | #include <linux/export.h> |
34ad7cdc | 31 | #include <linux/cma.h> |
5a0e3ad6 | 32 | #include <linux/gfp.h> |
9087c375 | 33 | #include <linux/dma-direct.h> |
1da177e4 | 34 | #include <asm/processor.h> |
7c0f6ba6 | 35 | #include <linux/uaccess.h> |
1da177e4 LT |
36 | #include <asm/pgtable.h> |
37 | #include <asm/pgalloc.h> | |
38 | #include <asm/dma.h> | |
39 | #include <asm/lowcore.h> | |
40 | #include <asm/tlb.h> | |
41 | #include <asm/tlbflush.h> | |
d882b172 | 42 | #include <asm/sections.h> |
a0616cde | 43 | #include <asm/ctl_reg.h> |
e5d709bb | 44 | #include <asm/sclp.h> |
e6c7c630 | 45 | #include <asm/set_memory.h> |
42db5ed8 | 46 | #include <asm/kasan.h> |
64e1f0c5 HP |
47 | #include <asm/dma-mapping.h> |
48 | #include <asm/uv.h> | |
1da177e4 | 49 | |
0ccb32c9 | 50 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir); |
1485c5c8 | 51 | |
238ec4ef | 52 | unsigned long empty_zero_page, zero_page_mask; |
1485c5c8 | 53 | EXPORT_SYMBOL(empty_zero_page); |
0b70068e | 54 | EXPORT_SYMBOL(zero_page_mask); |
1da177e4 | 55 | |
7a5da02d GS |
56 | bool initmem_freed; |
57 | ||
0999f119 | 58 | static void __init setup_zero_pages(void) |
238ec4ef | 59 | { |
238ec4ef | 60 | unsigned int order; |
238ec4ef MS |
61 | struct page *page; |
62 | int i; | |
63 | ||
c7e8b2c2 MS |
64 | /* Latest machines require a mapping granularity of 512KB */ |
65 | order = 7; | |
66 | ||
7919e91b | 67 | /* Limit number of empty zero pages for small memory sizes */ |
ca79b0c2 | 68 | while (order > 2 && (totalram_pages() >> 10) < (1UL << order)) |
1f6b83e5 | 69 | order--; |
238ec4ef MS |
70 | |
71 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); | |
72 | if (!empty_zero_page) | |
73 | panic("Out of memory in setup_zero_pages"); | |
74 | ||
75 | page = virt_to_page((void *) empty_zero_page); | |
76 | split_page(page, order); | |
77 | for (i = 1 << order; i > 0; i--) { | |
0999f119 | 78 | mark_page_reserved(page); |
238ec4ef MS |
79 | page++; |
80 | } | |
81 | ||
0999f119 | 82 | zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; |
238ec4ef MS |
83 | } |
84 | ||
1da177e4 LT |
85 | /* |
86 | * paging_init() sets up the page tables | |
87 | */ | |
1da177e4 LT |
88 | void __init paging_init(void) |
89 | { | |
39b742f9 | 90 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
14045ebf | 91 | unsigned long pgd_type, asce_bits; |
60c49701 | 92 | psw_t psw; |
d882b172 | 93 | |
3610cce8 | 94 | init_mm.pgd = swapper_pg_dir; |
f1c1174f | 95 | if (VMALLOC_END > _REGION2_SIZE) { |
14045ebf MS |
96 | asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; |
97 | pgd_type = _REGION2_ENTRY_EMPTY; | |
98 | } else { | |
99 | asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; | |
100 | pgd_type = _REGION3_ENTRY_EMPTY; | |
101 | } | |
723cacbd GS |
102 | init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; |
103 | S390_lowcore.kernel_asce = init_mm.context.asce; | |
0aaba41b | 104 | S390_lowcore.user_asce = S390_lowcore.kernel_asce; |
f1c1174f | 105 | crst_table_init((unsigned long *) init_mm.pgd, pgd_type); |
f4eb07c1 | 106 | vmem_map_init(); |
42db5ed8 | 107 | kasan_copy_shadow(init_mm.pgd); |
1da177e4 | 108 | |
42db5ed8 | 109 | /* enable virtual mapping in kernel mode */ |
3610cce8 MS |
110 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); |
111 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); | |
112 | __ctl_load(S390_lowcore.kernel_asce, 13, 13); | |
60c49701 | 113 | psw.mask = __extract_psw(); |
a7525982 | 114 | psw_bits(psw).dat = 1; |
8bb3fdd6 | 115 | psw_bits(psw).as = PSW_BITS_AS_HOME; |
60c49701 | 116 | __load_psw_mask(psw.mask); |
135ff163 | 117 | kasan_free_early_identity(); |
1da177e4 | 118 | |
17f34580 HC |
119 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
120 | sparse_init(); | |
39b742f9 HC |
121 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
122 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); | |
123 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
124 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 | 125 | } |
1da177e4 | 126 | |
91d37211 HC |
127 | void mark_rodata_ro(void) |
128 | { | |
d07a980c HC |
129 | unsigned long size = __end_ro_after_init - __start_ro_after_init; |
130 | ||
131 | set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT); | |
132 | pr_info("Write protected read-only-after-init data: %luk\n", size >> 10); | |
91d37211 HC |
133 | } |
134 | ||
64e1f0c5 HP |
135 | int set_memory_encrypted(unsigned long addr, int numpages) |
136 | { | |
137 | int i; | |
138 | ||
139 | /* make specified pages unshared, (swiotlb, dma_free) */ | |
140 | for (i = 0; i < numpages; ++i) { | |
141 | uv_remove_shared(addr); | |
142 | addr += PAGE_SIZE; | |
143 | } | |
144 | return 0; | |
145 | } | |
146 | ||
147 | int set_memory_decrypted(unsigned long addr, int numpages) | |
148 | { | |
149 | int i; | |
150 | /* make specified pages shared (swiotlb, dma_alloca) */ | |
151 | for (i = 0; i < numpages; ++i) { | |
152 | uv_set_shared(addr); | |
153 | addr += PAGE_SIZE; | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* are we a protected virtualization guest? */ | |
159 | bool sev_active(void) | |
160 | { | |
161 | return is_prot_virt_guest(); | |
162 | } | |
163 | ||
9087c375 TL |
164 | bool force_dma_unencrypted(struct device *dev) |
165 | { | |
166 | return sev_active(); | |
167 | } | |
168 | ||
64e1f0c5 HP |
169 | /* protected virtualization */ |
170 | static void pv_init(void) | |
171 | { | |
172 | if (!is_prot_virt_guest()) | |
173 | return; | |
174 | ||
175 | /* make sure bounce buffers are shared */ | |
176 | swiotlb_init(1); | |
177 | swiotlb_update_mem_attributes(); | |
178 | swiotlb_force = SWIOTLB_FORCE; | |
179 | } | |
180 | ||
1da177e4 LT |
181 | void __init mem_init(void) |
182 | { | |
64f31d58 | 183 | cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); |
1b948d6c | 184 | cpumask_set_cpu(0, mm_cpumask(&init_mm)); |
1b948d6c | 185 | |
3a368f74 | 186 | set_max_mapnr(max_low_pfn); |
1da177e4 LT |
187 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
188 | ||
64e1f0c5 HP |
189 | pv_init(); |
190 | ||
45e576b1 MS |
191 | /* Setup guest page hinting */ |
192 | cmma_init(); | |
193 | ||
1da177e4 | 194 | /* this will put all low memory onto the freelists */ |
c6ffc5ca | 195 | memblock_free_all(); |
0999f119 | 196 | setup_zero_pages(); /* Setup zeroed pages. */ |
1da177e4 | 197 | |
c9b5ad54 MS |
198 | cmma_init_nodat(); |
199 | ||
a18d0e2d | 200 | mem_init_print_info(NULL); |
1da177e4 LT |
201 | } |
202 | ||
d96221ab HC |
203 | void free_initmem(void) |
204 | { | |
7a5da02d | 205 | initmem_freed = true; |
ead7a22e HC |
206 | __set_memory((unsigned long)_sinittext, |
207 | (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT, | |
57d7f939 | 208 | SET_MEMORY_RW | SET_MEMORY_NX); |
dbe67df4 | 209 | free_initmem_default(POISON_FREE_INITMEM); |
1da177e4 LT |
210 | } |
211 | ||
604ddad0 HC |
212 | unsigned long memory_block_size_bytes(void) |
213 | { | |
214 | /* | |
215 | * Make sure the memory block size is always greater | |
216 | * or equal than the memory increment size. | |
217 | */ | |
218 | return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm); | |
219 | } | |
220 | ||
421c175c | 221 | #ifdef CONFIG_MEMORY_HOTPLUG |
34ad7cdc HC |
222 | |
223 | #ifdef CONFIG_CMA | |
224 | ||
225 | /* Prevent memory blocks which contain cma regions from going offline */ | |
226 | ||
227 | struct s390_cma_mem_data { | |
228 | unsigned long start; | |
229 | unsigned long end; | |
230 | }; | |
231 | ||
232 | static int s390_cma_check_range(struct cma *cma, void *data) | |
233 | { | |
234 | struct s390_cma_mem_data *mem_data; | |
235 | unsigned long start, end; | |
236 | ||
237 | mem_data = data; | |
238 | start = cma_get_base(cma); | |
239 | end = start + cma_get_size(cma); | |
240 | if (end < mem_data->start) | |
241 | return 0; | |
242 | if (start >= mem_data->end) | |
243 | return 0; | |
244 | return -EBUSY; | |
245 | } | |
246 | ||
247 | static int s390_cma_mem_notifier(struct notifier_block *nb, | |
248 | unsigned long action, void *data) | |
249 | { | |
250 | struct s390_cma_mem_data mem_data; | |
251 | struct memory_notify *arg; | |
252 | int rc = 0; | |
253 | ||
254 | arg = data; | |
255 | mem_data.start = arg->start_pfn << PAGE_SHIFT; | |
256 | mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT); | |
257 | if (action == MEM_GOING_OFFLINE) | |
258 | rc = cma_for_each_area(s390_cma_check_range, &mem_data); | |
259 | return notifier_from_errno(rc); | |
260 | } | |
261 | ||
262 | static struct notifier_block s390_cma_mem_nb = { | |
263 | .notifier_call = s390_cma_mem_notifier, | |
264 | }; | |
265 | ||
266 | static int __init s390_cma_mem_init(void) | |
267 | { | |
268 | return register_memory_notifier(&s390_cma_mem_nb); | |
269 | } | |
270 | device_initcall(s390_cma_mem_init); | |
271 | ||
272 | #endif /* CONFIG_CMA */ | |
273 | ||
940519f0 MH |
274 | int arch_add_memory(int nid, u64 start, u64 size, |
275 | struct mhp_restrictions *restrictions) | |
421c175c | 276 | { |
892365ab GS |
277 | unsigned long start_pfn = PFN_DOWN(start); |
278 | unsigned long size_pages = PFN_DOWN(size); | |
f1dd2cd1 | 279 | int rc; |
421c175c | 280 | |
973de24a DH |
281 | if (WARN_ON_ONCE(restrictions->altmap)) |
282 | return -EINVAL; | |
283 | ||
421c175c HC |
284 | rc = vmem_add_mapping(start, size); |
285 | if (rc) | |
286 | return rc; | |
199071f1 | 287 | |
940519f0 | 288 | rc = __add_pages(nid, start_pfn, size_pages, restrictions); |
421c175c HC |
289 | if (rc) |
290 | vmem_remove_mapping(start, size); | |
291 | return rc; | |
292 | } | |
24d335ca | 293 | |
ac5c9426 DH |
294 | void arch_remove_memory(int nid, u64 start, u64 size, |
295 | struct vmem_altmap *altmap) | |
24d335ca | 296 | { |
18c86506 DH |
297 | unsigned long start_pfn = start >> PAGE_SHIFT; |
298 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
299 | struct zone *zone; | |
300 | ||
301 | zone = page_zone(pfn_to_page(start_pfn)); | |
302 | __remove_pages(zone, start_pfn, nr_pages, altmap); | |
303 | vmem_remove_mapping(start, size); | |
24d335ca | 304 | } |
421c175c | 305 | #endif /* CONFIG_MEMORY_HOTPLUG */ |