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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> | |
24 | #include <linux/bootmem.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> |
199071f1 | 32 | #include <linux/memblock.h> |
1da177e4 | 33 | #include <asm/processor.h> |
7c0f6ba6 | 34 | #include <linux/uaccess.h> |
1da177e4 LT |
35 | #include <asm/pgtable.h> |
36 | #include <asm/pgalloc.h> | |
37 | #include <asm/dma.h> | |
38 | #include <asm/lowcore.h> | |
39 | #include <asm/tlb.h> | |
40 | #include <asm/tlbflush.h> | |
d882b172 | 41 | #include <asm/sections.h> |
a0616cde | 42 | #include <asm/ctl_reg.h> |
e5d709bb | 43 | #include <asm/sclp.h> |
e6c7c630 | 44 | #include <asm/set_memory.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; | |
f1c1174f | 98 | crst_table_init((unsigned long *) init_mm.pgd, pgd_type); |
f4eb07c1 | 99 | vmem_map_init(); |
1da177e4 | 100 | |
1da177e4 | 101 | /* enable virtual mapping in kernel mode */ |
3610cce8 MS |
102 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); |
103 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); | |
104 | __ctl_load(S390_lowcore.kernel_asce, 13, 13); | |
60c49701 | 105 | psw.mask = __extract_psw(); |
a7525982 | 106 | psw_bits(psw).dat = 1; |
8bb3fdd6 | 107 | psw_bits(psw).as = PSW_BITS_AS_HOME; |
60c49701 | 108 | __load_psw_mask(psw.mask); |
1da177e4 | 109 | |
17f34580 HC |
110 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
111 | sparse_init(); | |
39b742f9 HC |
112 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
113 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); | |
114 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
115 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 | 116 | } |
1da177e4 | 117 | |
91d37211 HC |
118 | void mark_rodata_ro(void) |
119 | { | |
d07a980c HC |
120 | unsigned long size = __end_ro_after_init - __start_ro_after_init; |
121 | ||
122 | set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT); | |
123 | pr_info("Write protected read-only-after-init data: %luk\n", size >> 10); | |
91d37211 HC |
124 | } |
125 | ||
1da177e4 LT |
126 | void __init mem_init(void) |
127 | { | |
64f31d58 | 128 | cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); |
1b948d6c | 129 | cpumask_set_cpu(0, mm_cpumask(&init_mm)); |
1b948d6c | 130 | |
3a368f74 | 131 | set_max_mapnr(max_low_pfn); |
1da177e4 LT |
132 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
133 | ||
45e576b1 MS |
134 | /* Setup guest page hinting */ |
135 | cmma_init(); | |
136 | ||
1da177e4 | 137 | /* this will put all low memory onto the freelists */ |
0c988534 | 138 | free_all_bootmem(); |
0999f119 | 139 | setup_zero_pages(); /* Setup zeroed pages. */ |
1da177e4 | 140 | |
c9b5ad54 MS |
141 | cmma_init_nodat(); |
142 | ||
a18d0e2d | 143 | mem_init_print_info(NULL); |
1da177e4 LT |
144 | } |
145 | ||
d96221ab HC |
146 | void free_initmem(void) |
147 | { | |
57d7f939 MS |
148 | __set_memory((unsigned long) _sinittext, |
149 | (_einittext - _sinittext) >> PAGE_SHIFT, | |
150 | SET_MEMORY_RW | SET_MEMORY_NX); | |
dbe67df4 | 151 | free_initmem_default(POISON_FREE_INITMEM); |
1da177e4 LT |
152 | } |
153 | ||
154 | #ifdef CONFIG_BLK_DEV_INITRD | |
5e249d6e | 155 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
1da177e4 | 156 | { |
11199692 JL |
157 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
158 | "initrd"); | |
1da177e4 LT |
159 | } |
160 | #endif | |
421c175c | 161 | |
604ddad0 HC |
162 | unsigned long memory_block_size_bytes(void) |
163 | { | |
164 | /* | |
165 | * Make sure the memory block size is always greater | |
166 | * or equal than the memory increment size. | |
167 | */ | |
168 | return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm); | |
169 | } | |
170 | ||
421c175c | 171 | #ifdef CONFIG_MEMORY_HOTPLUG |
34ad7cdc HC |
172 | |
173 | #ifdef CONFIG_CMA | |
174 | ||
175 | /* Prevent memory blocks which contain cma regions from going offline */ | |
176 | ||
177 | struct s390_cma_mem_data { | |
178 | unsigned long start; | |
179 | unsigned long end; | |
180 | }; | |
181 | ||
182 | static int s390_cma_check_range(struct cma *cma, void *data) | |
183 | { | |
184 | struct s390_cma_mem_data *mem_data; | |
185 | unsigned long start, end; | |
186 | ||
187 | mem_data = data; | |
188 | start = cma_get_base(cma); | |
189 | end = start + cma_get_size(cma); | |
190 | if (end < mem_data->start) | |
191 | return 0; | |
192 | if (start >= mem_data->end) | |
193 | return 0; | |
194 | return -EBUSY; | |
195 | } | |
196 | ||
197 | static int s390_cma_mem_notifier(struct notifier_block *nb, | |
198 | unsigned long action, void *data) | |
199 | { | |
200 | struct s390_cma_mem_data mem_data; | |
201 | struct memory_notify *arg; | |
202 | int rc = 0; | |
203 | ||
204 | arg = data; | |
205 | mem_data.start = arg->start_pfn << PAGE_SHIFT; | |
206 | mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT); | |
207 | if (action == MEM_GOING_OFFLINE) | |
208 | rc = cma_for_each_area(s390_cma_check_range, &mem_data); | |
209 | return notifier_from_errno(rc); | |
210 | } | |
211 | ||
212 | static struct notifier_block s390_cma_mem_nb = { | |
213 | .notifier_call = s390_cma_mem_notifier, | |
214 | }; | |
215 | ||
216 | static int __init s390_cma_mem_init(void) | |
217 | { | |
218 | return register_memory_notifier(&s390_cma_mem_nb); | |
219 | } | |
220 | device_initcall(s390_cma_mem_init); | |
221 | ||
222 | #endif /* CONFIG_CMA */ | |
223 | ||
3d79a728 | 224 | int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock) |
421c175c | 225 | { |
892365ab GS |
226 | unsigned long start_pfn = PFN_DOWN(start); |
227 | unsigned long size_pages = PFN_DOWN(size); | |
f1dd2cd1 | 228 | int rc; |
421c175c | 229 | |
421c175c HC |
230 | rc = vmem_add_mapping(start, size); |
231 | if (rc) | |
232 | return rc; | |
199071f1 | 233 | |
3d79a728 | 234 | rc = __add_pages(nid, start_pfn, size_pages, want_memblock); |
421c175c HC |
235 | if (rc) |
236 | vmem_remove_mapping(start, size); | |
237 | return rc; | |
238 | } | |
24d335ca WC |
239 | |
240 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
241 | int arch_remove_memory(u64 start, u64 size) | |
242 | { | |
243 | /* | |
244 | * There is no hardware or firmware interface which could trigger a | |
245 | * hot memory remove on s390. So there is nothing that needs to be | |
246 | * implemented. | |
247 | */ | |
248 | return -EBUSY; | |
249 | } | |
250 | #endif | |
421c175c | 251 | #endif /* CONFIG_MEMORY_HOTPLUG */ |