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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> | |
21 | #include <linux/smp.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/pagemap.h> | |
57c8a661 | 24 | #include <linux/memblock.h> |
e5d709bb | 25 | #include <linux/memory.h> |
d882b172 | 26 | #include <linux/pfn.h> |
028d9b3c | 27 | #include <linux/poison.h> |
2b67fc46 | 28 | #include <linux/initrd.h> |
3a4c5d59 | 29 | #include <linux/export.h> |
34ad7cdc | 30 | #include <linux/cma.h> |
5a0e3ad6 | 31 | #include <linux/gfp.h> |
1da177e4 | 32 | #include <asm/processor.h> |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | #include <asm/pgtable.h> |
35 | #include <asm/pgalloc.h> | |
36 | #include <asm/dma.h> | |
37 | #include <asm/lowcore.h> | |
38 | #include <asm/tlb.h> | |
39 | #include <asm/tlbflush.h> | |
d882b172 | 40 | #include <asm/sections.h> |
a0616cde | 41 | #include <asm/ctl_reg.h> |
e5d709bb | 42 | #include <asm/sclp.h> |
e6c7c630 | 43 | #include <asm/set_memory.h> |
42db5ed8 | 44 | #include <asm/kasan.h> |
1da177e4 | 45 | |
0ccb32c9 | 46 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir); |
1485c5c8 | 47 | |
238ec4ef | 48 | unsigned long empty_zero_page, zero_page_mask; |
1485c5c8 | 49 | EXPORT_SYMBOL(empty_zero_page); |
0b70068e | 50 | EXPORT_SYMBOL(zero_page_mask); |
1da177e4 | 51 | |
0999f119 | 52 | static void __init setup_zero_pages(void) |
238ec4ef | 53 | { |
238ec4ef | 54 | unsigned int order; |
238ec4ef MS |
55 | struct page *page; |
56 | int i; | |
57 | ||
c7e8b2c2 MS |
58 | /* Latest machines require a mapping granularity of 512KB */ |
59 | order = 7; | |
60 | ||
7919e91b | 61 | /* Limit number of empty zero pages for small memory sizes */ |
1f6b83e5 MS |
62 | while (order > 2 && (totalram_pages >> 10) < (1UL << order)) |
63 | order--; | |
238ec4ef MS |
64 | |
65 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); | |
66 | if (!empty_zero_page) | |
67 | panic("Out of memory in setup_zero_pages"); | |
68 | ||
69 | page = virt_to_page((void *) empty_zero_page); | |
70 | split_page(page, order); | |
71 | for (i = 1 << order; i > 0; i--) { | |
0999f119 | 72 | mark_page_reserved(page); |
238ec4ef MS |
73 | page++; |
74 | } | |
75 | ||
0999f119 | 76 | zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; |
238ec4ef MS |
77 | } |
78 | ||
1da177e4 LT |
79 | /* |
80 | * paging_init() sets up the page tables | |
81 | */ | |
1da177e4 LT |
82 | void __init paging_init(void) |
83 | { | |
39b742f9 | 84 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
14045ebf | 85 | unsigned long pgd_type, asce_bits; |
60c49701 | 86 | psw_t psw; |
d882b172 | 87 | |
3610cce8 | 88 | init_mm.pgd = swapper_pg_dir; |
f1c1174f | 89 | if (VMALLOC_END > _REGION2_SIZE) { |
14045ebf MS |
90 | asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; |
91 | pgd_type = _REGION2_ENTRY_EMPTY; | |
92 | } else { | |
93 | asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; | |
94 | pgd_type = _REGION3_ENTRY_EMPTY; | |
95 | } | |
723cacbd GS |
96 | init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; |
97 | S390_lowcore.kernel_asce = init_mm.context.asce; | |
0aaba41b | 98 | S390_lowcore.user_asce = S390_lowcore.kernel_asce; |
f1c1174f | 99 | crst_table_init((unsigned long *) init_mm.pgd, pgd_type); |
f4eb07c1 | 100 | vmem_map_init(); |
42db5ed8 | 101 | kasan_copy_shadow(init_mm.pgd); |
1da177e4 | 102 | |
42db5ed8 | 103 | /* enable virtual mapping in kernel mode */ |
3610cce8 MS |
104 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); |
105 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); | |
106 | __ctl_load(S390_lowcore.kernel_asce, 13, 13); | |
60c49701 | 107 | psw.mask = __extract_psw(); |
a7525982 | 108 | psw_bits(psw).dat = 1; |
8bb3fdd6 | 109 | psw_bits(psw).as = PSW_BITS_AS_HOME; |
60c49701 | 110 | __load_psw_mask(psw.mask); |
135ff163 | 111 | kasan_free_early_identity(); |
1da177e4 | 112 | |
17f34580 HC |
113 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
114 | sparse_init(); | |
39b742f9 HC |
115 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
116 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); | |
117 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
118 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 | 119 | } |
1da177e4 | 120 | |
91d37211 HC |
121 | void mark_rodata_ro(void) |
122 | { | |
d07a980c HC |
123 | unsigned long size = __end_ro_after_init - __start_ro_after_init; |
124 | ||
125 | set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT); | |
126 | pr_info("Write protected read-only-after-init data: %luk\n", size >> 10); | |
91d37211 HC |
127 | } |
128 | ||
1da177e4 LT |
129 | void __init mem_init(void) |
130 | { | |
64f31d58 | 131 | cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); |
1b948d6c | 132 | cpumask_set_cpu(0, mm_cpumask(&init_mm)); |
1b948d6c | 133 | |
3a368f74 | 134 | set_max_mapnr(max_low_pfn); |
1da177e4 LT |
135 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
136 | ||
45e576b1 MS |
137 | /* Setup guest page hinting */ |
138 | cmma_init(); | |
139 | ||
1da177e4 | 140 | /* this will put all low memory onto the freelists */ |
c6ffc5ca | 141 | memblock_free_all(); |
0999f119 | 142 | setup_zero_pages(); /* Setup zeroed pages. */ |
1da177e4 | 143 | |
c9b5ad54 MS |
144 | cmma_init_nodat(); |
145 | ||
a18d0e2d | 146 | mem_init_print_info(NULL); |
1da177e4 LT |
147 | } |
148 | ||
d96221ab HC |
149 | void free_initmem(void) |
150 | { | |
ead7a22e HC |
151 | __set_memory((unsigned long)_sinittext, |
152 | (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT, | |
57d7f939 | 153 | SET_MEMORY_RW | SET_MEMORY_NX); |
dbe67df4 | 154 | free_initmem_default(POISON_FREE_INITMEM); |
1da177e4 LT |
155 | } |
156 | ||
157 | #ifdef CONFIG_BLK_DEV_INITRD | |
5e249d6e | 158 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
1da177e4 | 159 | { |
11199692 JL |
160 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
161 | "initrd"); | |
1da177e4 LT |
162 | } |
163 | #endif | |
421c175c | 164 | |
604ddad0 HC |
165 | unsigned long memory_block_size_bytes(void) |
166 | { | |
167 | /* | |
168 | * Make sure the memory block size is always greater | |
169 | * or equal than the memory increment size. | |
170 | */ | |
171 | return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm); | |
172 | } | |
173 | ||
421c175c | 174 | #ifdef CONFIG_MEMORY_HOTPLUG |
34ad7cdc HC |
175 | |
176 | #ifdef CONFIG_CMA | |
177 | ||
178 | /* Prevent memory blocks which contain cma regions from going offline */ | |
179 | ||
180 | struct s390_cma_mem_data { | |
181 | unsigned long start; | |
182 | unsigned long end; | |
183 | }; | |
184 | ||
185 | static int s390_cma_check_range(struct cma *cma, void *data) | |
186 | { | |
187 | struct s390_cma_mem_data *mem_data; | |
188 | unsigned long start, end; | |
189 | ||
190 | mem_data = data; | |
191 | start = cma_get_base(cma); | |
192 | end = start + cma_get_size(cma); | |
193 | if (end < mem_data->start) | |
194 | return 0; | |
195 | if (start >= mem_data->end) | |
196 | return 0; | |
197 | return -EBUSY; | |
198 | } | |
199 | ||
200 | static int s390_cma_mem_notifier(struct notifier_block *nb, | |
201 | unsigned long action, void *data) | |
202 | { | |
203 | struct s390_cma_mem_data mem_data; | |
204 | struct memory_notify *arg; | |
205 | int rc = 0; | |
206 | ||
207 | arg = data; | |
208 | mem_data.start = arg->start_pfn << PAGE_SHIFT; | |
209 | mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT); | |
210 | if (action == MEM_GOING_OFFLINE) | |
211 | rc = cma_for_each_area(s390_cma_check_range, &mem_data); | |
212 | return notifier_from_errno(rc); | |
213 | } | |
214 | ||
215 | static struct notifier_block s390_cma_mem_nb = { | |
216 | .notifier_call = s390_cma_mem_notifier, | |
217 | }; | |
218 | ||
219 | static int __init s390_cma_mem_init(void) | |
220 | { | |
221 | return register_memory_notifier(&s390_cma_mem_nb); | |
222 | } | |
223 | device_initcall(s390_cma_mem_init); | |
224 | ||
225 | #endif /* CONFIG_CMA */ | |
226 | ||
24e6d5a5 CH |
227 | int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, |
228 | bool want_memblock) | |
421c175c | 229 | { |
892365ab GS |
230 | unsigned long start_pfn = PFN_DOWN(start); |
231 | unsigned long size_pages = PFN_DOWN(size); | |
f1dd2cd1 | 232 | int rc; |
421c175c | 233 | |
421c175c HC |
234 | rc = vmem_add_mapping(start, size); |
235 | if (rc) | |
236 | return rc; | |
199071f1 | 237 | |
24e6d5a5 | 238 | rc = __add_pages(nid, start_pfn, size_pages, altmap, want_memblock); |
421c175c HC |
239 | if (rc) |
240 | vmem_remove_mapping(start, size); | |
241 | return rc; | |
242 | } | |
24d335ca WC |
243 | |
244 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
da024512 | 245 | int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) |
24d335ca WC |
246 | { |
247 | /* | |
248 | * There is no hardware or firmware interface which could trigger a | |
249 | * hot memory remove on s390. So there is nothing that needs to be | |
250 | * implemented. | |
251 | */ | |
252 | return -EBUSY; | |
253 | } | |
254 | #endif | |
421c175c | 255 | #endif /* CONFIG_MEMORY_HOTPLUG */ |