1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * S390 version |
4 | * Copyright IBM Corp. 1999 |
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 | |
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/swiotlb.h> |
22 | #include <linux/smp.h> |
23 | #include <linux/init.h> |
24 | #include <linux/pagemap.h> |
25 | #include <linux/memblock.h> |
26 | #include <linux/memory.h> |
27 | #include <linux/pfn.h> |
28 | #include <linux/poison.h> |
29 | #include <linux/initrd.h> |
30 | #include <linux/export.h> |
31 | #include <linux/cma.h> |
32 | #include <linux/gfp.h> |
33 | #include <linux/dma-direct.h> |
34 | #include <linux/percpu.h> |
35 | #include <asm/processor.h> |
36 | #include <linux/uaccess.h> |
37 | #include <asm/pgalloc.h> |
38 | #include <asm/ctlreg.h> |
39 | #include <asm/kfence.h> |
40 | #include <asm/dma.h> |
41 | #include <asm/abs_lowcore.h> |
42 | #include <asm/tlb.h> |
43 | #include <asm/tlbflush.h> |
44 | #include <asm/sections.h> |
45 | #include <asm/sclp.h> |
46 | #include <asm/set_memory.h> |
47 | #include <asm/kasan.h> |
48 | #include <asm/dma-mapping.h> |
49 | #include <asm/uv.h> |
50 | #include <linux/virtio_anchor.h> |
51 | #include <linux/virtio_config.h> |
52 | |
53 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir" ); |
54 | pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir" ); |
55 | |
56 | struct ctlreg __bootdata_preserved(s390_invalid_asce); |
57 | |
58 | unsigned long empty_zero_page, zero_page_mask; |
59 | EXPORT_SYMBOL(empty_zero_page); |
60 | EXPORT_SYMBOL(zero_page_mask); |
61 | |
62 | static void __init setup_zero_pages(void) |
63 | { |
64 | unsigned int order; |
65 | struct page *page; |
66 | int i; |
67 | |
68 | /* Latest machines require a mapping granularity of 512KB */ |
69 | order = 7; |
70 | |
71 | /* Limit number of empty zero pages for small memory sizes */ |
72 | while (order > 2 && (totalram_pages() >> 10) < (1UL << order)) |
73 | order--; |
74 | |
75 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); |
76 | if (!empty_zero_page) |
77 | panic(fmt: "Out of memory in setup_zero_pages" ); |
78 | |
79 | page = virt_to_page((void *) empty_zero_page); |
80 | split_page(page, order); |
81 | for (i = 1 << order; i > 0; i--) { |
82 | mark_page_reserved(page); |
83 | page++; |
84 | } |
85 | |
86 | zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; |
87 | } |
88 | |
89 | /* |
90 | * paging_init() sets up the page tables |
91 | */ |
92 | void __init paging_init(void) |
93 | { |
94 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
95 | |
96 | vmem_map_init(); |
97 | sparse_init(); |
98 | zone_dma_bits = 31; |
99 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
100 | max_zone_pfns[ZONE_DMA] = virt_to_pfn(MAX_DMA_ADDRESS); |
101 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
102 | free_area_init(max_zone_pfn: max_zone_pfns); |
103 | } |
104 | |
105 | void mark_rodata_ro(void) |
106 | { |
107 | unsigned long size = __end_ro_after_init - __start_ro_after_init; |
108 | |
109 | __set_memory_ro(__start_ro_after_init, __end_ro_after_init); |
110 | pr_info("Write protected read-only-after-init data: %luk\n" , size >> 10); |
111 | } |
112 | |
113 | int set_memory_encrypted(unsigned long vaddr, int numpages) |
114 | { |
115 | int i; |
116 | |
117 | /* make specified pages unshared, (swiotlb, dma_free) */ |
118 | for (i = 0; i < numpages; ++i) { |
119 | uv_remove_shared(virt_to_phys(address: (void *)vaddr)); |
120 | vaddr += PAGE_SIZE; |
121 | } |
122 | return 0; |
123 | } |
124 | |
125 | int set_memory_decrypted(unsigned long vaddr, int numpages) |
126 | { |
127 | int i; |
128 | /* make specified pages shared (swiotlb, dma_alloca) */ |
129 | for (i = 0; i < numpages; ++i) { |
130 | uv_set_shared(virt_to_phys(address: (void *)vaddr)); |
131 | vaddr += PAGE_SIZE; |
132 | } |
133 | return 0; |
134 | } |
135 | |
136 | /* are we a protected virtualization guest? */ |
137 | bool force_dma_unencrypted(struct device *dev) |
138 | { |
139 | return is_prot_virt_guest(); |
140 | } |
141 | |
142 | /* protected virtualization */ |
143 | static void pv_init(void) |
144 | { |
145 | if (!is_prot_virt_guest()) |
146 | return; |
147 | |
148 | virtio_set_mem_acc_cb(func: virtio_require_restricted_mem_acc); |
149 | |
150 | /* make sure bounce buffers are shared */ |
151 | swiotlb_init(addressing_limited: true, SWIOTLB_FORCE | SWIOTLB_VERBOSE); |
152 | swiotlb_update_mem_attributes(); |
153 | } |
154 | |
155 | void __init mem_init(void) |
156 | { |
157 | cpumask_set_cpu(cpu: 0, dstp: &init_mm.context.cpu_attach_mask); |
158 | cpumask_set_cpu(cpu: 0, dstp: mm_cpumask(mm: &init_mm)); |
159 | |
160 | set_max_mapnr(max_low_pfn); |
161 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
162 | |
163 | pv_init(); |
164 | kfence_split_mapping(); |
165 | |
166 | /* this will put all low memory onto the freelists */ |
167 | memblock_free_all(); |
168 | setup_zero_pages(); /* Setup zeroed pages. */ |
169 | } |
170 | |
171 | void free_initmem(void) |
172 | { |
173 | set_memory_rwnx((unsigned long)_sinittext, |
174 | (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT); |
175 | free_initmem_default(POISON_FREE_INITMEM); |
176 | } |
177 | |
178 | unsigned long memory_block_size_bytes(void) |
179 | { |
180 | /* |
181 | * Make sure the memory block size is always greater |
182 | * or equal than the memory increment size. |
183 | */ |
184 | return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm); |
185 | } |
186 | |
187 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; |
188 | EXPORT_SYMBOL(__per_cpu_offset); |
189 | |
190 | static int __init pcpu_cpu_distance(unsigned int from, unsigned int to) |
191 | { |
192 | return LOCAL_DISTANCE; |
193 | } |
194 | |
195 | static int __init pcpu_cpu_to_node(int cpu) |
196 | { |
197 | return 0; |
198 | } |
199 | |
200 | void __init setup_per_cpu_areas(void) |
201 | { |
202 | unsigned long delta; |
203 | unsigned int cpu; |
204 | int rc; |
205 | |
206 | /* |
207 | * Always reserve area for module percpu variables. That's |
208 | * what the legacy allocator did. |
209 | */ |
210 | rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, |
211 | PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, |
212 | cpu_distance_fn: pcpu_cpu_distance, |
213 | cpu_to_nd_fn: pcpu_cpu_to_node); |
214 | if (rc < 0) |
215 | panic(fmt: "Failed to initialize percpu areas." ); |
216 | |
217 | delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; |
218 | for_each_possible_cpu(cpu) |
219 | __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu]; |
220 | } |
221 | |
222 | #ifdef CONFIG_MEMORY_HOTPLUG |
223 | |
224 | #ifdef CONFIG_CMA |
225 | |
226 | /* Prevent memory blocks which contain cma regions from going offline */ |
227 | |
228 | struct s390_cma_mem_data { |
229 | unsigned long start; |
230 | unsigned long end; |
231 | }; |
232 | |
233 | static int s390_cma_check_range(struct cma *cma, void *data) |
234 | { |
235 | struct s390_cma_mem_data *mem_data; |
236 | unsigned long start, end; |
237 | |
238 | mem_data = data; |
239 | start = cma_get_base(cma); |
240 | end = start + cma_get_size(cma); |
241 | if (end < mem_data->start) |
242 | return 0; |
243 | if (start >= mem_data->end) |
244 | return 0; |
245 | return -EBUSY; |
246 | } |
247 | |
248 | static int s390_cma_mem_notifier(struct notifier_block *nb, |
249 | unsigned long action, void *data) |
250 | { |
251 | struct s390_cma_mem_data mem_data; |
252 | struct memory_notify *arg; |
253 | int rc = 0; |
254 | |
255 | arg = data; |
256 | mem_data.start = arg->start_pfn << PAGE_SHIFT; |
257 | mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT); |
258 | if (action == MEM_GOING_OFFLINE) |
259 | rc = cma_for_each_area(it: s390_cma_check_range, data: &mem_data); |
260 | return notifier_from_errno(err: rc); |
261 | } |
262 | |
263 | static struct notifier_block s390_cma_mem_nb = { |
264 | .notifier_call = s390_cma_mem_notifier, |
265 | }; |
266 | |
267 | static int __init s390_cma_mem_init(void) |
268 | { |
269 | return register_memory_notifier(nb: &s390_cma_mem_nb); |
270 | } |
271 | device_initcall(s390_cma_mem_init); |
272 | |
273 | #endif /* CONFIG_CMA */ |
274 | |
275 | int arch_add_memory(int nid, u64 start, u64 size, |
276 | struct mhp_params *params) |
277 | { |
278 | unsigned long start_pfn = PFN_DOWN(start); |
279 | unsigned long size_pages = PFN_DOWN(size); |
280 | int rc; |
281 | |
282 | if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot)) |
283 | return -EINVAL; |
284 | |
285 | VM_BUG_ON(!mhp_range_allowed(start, size, true)); |
286 | rc = vmem_add_mapping(start, size); |
287 | if (rc) |
288 | return rc; |
289 | |
290 | rc = __add_pages(nid, start_pfn, nr_pages: size_pages, params); |
291 | if (rc) |
292 | vmem_remove_mapping(start, size); |
293 | return rc; |
294 | } |
295 | |
296 | void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) |
297 | { |
298 | unsigned long start_pfn = start >> PAGE_SHIFT; |
299 | unsigned long nr_pages = size >> PAGE_SHIFT; |
300 | |
301 | __remove_pages(start_pfn, nr_pages, altmap); |
302 | vmem_remove_mapping(start, size); |
303 | } |
304 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
305 | |