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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/kfence.h>
39#include <asm/ptdump.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/ctl_reg.h>
46#include <asm/sclp.h>
47#include <asm/set_memory.h>
48#include <asm/kasan.h>
49#include <asm/dma-mapping.h>
50#include <asm/uv.h>
51#include <linux/virtio_anchor.h>
52#include <linux/virtio_config.h>
53
54pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir");
55pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir");
56
57unsigned long __bootdata_preserved(s390_invalid_asce);
58
59unsigned long empty_zero_page, zero_page_mask;
60EXPORT_SYMBOL(empty_zero_page);
61EXPORT_SYMBOL(zero_page_mask);
62
63static void __init setup_zero_pages(void)
64{
65 unsigned int order;
66 struct page *page;
67 int i;
68
69 /* Latest machines require a mapping granularity of 512KB */
70 order = 7;
71
72 /* Limit number of empty zero pages for small memory sizes */
73 while (order > 2 && (totalram_pages() >> 10) < (1UL << order))
74 order--;
75
76 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
77 if (!empty_zero_page)
78 panic("Out of memory in setup_zero_pages");
79
80 page = virt_to_page((void *) empty_zero_page);
81 split_page(page, order);
82 for (i = 1 << order; i > 0; i--) {
83 mark_page_reserved(page);
84 page++;
85 }
86
87 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
88}
89
90/*
91 * paging_init() sets up the page tables
92 */
93void __init paging_init(void)
94{
95 unsigned long max_zone_pfns[MAX_NR_ZONES];
96
97 vmem_map_init();
98 sparse_init();
99 zone_dma_bits = 31;
100 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
101 max_zone_pfns[ZONE_DMA] = virt_to_pfn(MAX_DMA_ADDRESS);
102 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
103 free_area_init(max_zone_pfns);
104}
105
106void mark_rodata_ro(void)
107{
108 unsigned long size = __end_ro_after_init - __start_ro_after_init;
109
110 __set_memory_ro(__start_ro_after_init, __end_ro_after_init);
111 pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
112 debug_checkwx();
113}
114
115int set_memory_encrypted(unsigned long vaddr, int numpages)
116{
117 int i;
118
119 /* make specified pages unshared, (swiotlb, dma_free) */
120 for (i = 0; i < numpages; ++i) {
121 uv_remove_shared(virt_to_phys((void *)vaddr));
122 vaddr += PAGE_SIZE;
123 }
124 return 0;
125}
126
127int set_memory_decrypted(unsigned long vaddr, int numpages)
128{
129 int i;
130 /* make specified pages shared (swiotlb, dma_alloca) */
131 for (i = 0; i < numpages; ++i) {
132 uv_set_shared(virt_to_phys((void *)vaddr));
133 vaddr += PAGE_SIZE;
134 }
135 return 0;
136}
137
138/* are we a protected virtualization guest? */
139bool force_dma_unencrypted(struct device *dev)
140{
141 return is_prot_virt_guest();
142}
143
144/* protected virtualization */
145static void pv_init(void)
146{
147 if (!is_prot_virt_guest())
148 return;
149
150 virtio_set_mem_acc_cb(virtio_require_restricted_mem_acc);
151
152 /* make sure bounce buffers are shared */
153 swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE);
154 swiotlb_update_mem_attributes();
155}
156
157void __init mem_init(void)
158{
159 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
160 cpumask_set_cpu(0, mm_cpumask(&init_mm));
161
162 set_max_mapnr(max_low_pfn);
163 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
164
165 pv_init();
166 kfence_split_mapping();
167 /* Setup guest page hinting */
168 cmma_init();
169
170 /* this will put all low memory onto the freelists */
171 memblock_free_all();
172 setup_zero_pages(); /* Setup zeroed pages. */
173
174 cmma_init_nodat();
175}
176
177void free_initmem(void)
178{
179 set_memory_rwnx((unsigned long)_sinittext,
180 (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT);
181 free_initmem_default(POISON_FREE_INITMEM);
182}
183
184unsigned long memory_block_size_bytes(void)
185{
186 /*
187 * Make sure the memory block size is always greater
188 * or equal than the memory increment size.
189 */
190 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
191}
192
193unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
194EXPORT_SYMBOL(__per_cpu_offset);
195
196static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
197{
198 return LOCAL_DISTANCE;
199}
200
201static int __init pcpu_cpu_to_node(int cpu)
202{
203 return 0;
204}
205
206void __init setup_per_cpu_areas(void)
207{
208 unsigned long delta;
209 unsigned int cpu;
210 int rc;
211
212 /*
213 * Always reserve area for module percpu variables. That's
214 * what the legacy allocator did.
215 */
216 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
217 PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
218 pcpu_cpu_distance,
219 pcpu_cpu_to_node);
220 if (rc < 0)
221 panic("Failed to initialize percpu areas.");
222
223 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
224 for_each_possible_cpu(cpu)
225 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
226}
227
228#ifdef CONFIG_MEMORY_HOTPLUG
229
230#ifdef CONFIG_CMA
231
232/* Prevent memory blocks which contain cma regions from going offline */
233
234struct s390_cma_mem_data {
235 unsigned long start;
236 unsigned long end;
237};
238
239static int s390_cma_check_range(struct cma *cma, void *data)
240{
241 struct s390_cma_mem_data *mem_data;
242 unsigned long start, end;
243
244 mem_data = data;
245 start = cma_get_base(cma);
246 end = start + cma_get_size(cma);
247 if (end < mem_data->start)
248 return 0;
249 if (start >= mem_data->end)
250 return 0;
251 return -EBUSY;
252}
253
254static int s390_cma_mem_notifier(struct notifier_block *nb,
255 unsigned long action, void *data)
256{
257 struct s390_cma_mem_data mem_data;
258 struct memory_notify *arg;
259 int rc = 0;
260
261 arg = data;
262 mem_data.start = arg->start_pfn << PAGE_SHIFT;
263 mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
264 if (action == MEM_GOING_OFFLINE)
265 rc = cma_for_each_area(s390_cma_check_range, &mem_data);
266 return notifier_from_errno(rc);
267}
268
269static struct notifier_block s390_cma_mem_nb = {
270 .notifier_call = s390_cma_mem_notifier,
271};
272
273static int __init s390_cma_mem_init(void)
274{
275 return register_memory_notifier(&s390_cma_mem_nb);
276}
277device_initcall(s390_cma_mem_init);
278
279#endif /* CONFIG_CMA */
280
281int arch_add_memory(int nid, u64 start, u64 size,
282 struct mhp_params *params)
283{
284 unsigned long start_pfn = PFN_DOWN(start);
285 unsigned long size_pages = PFN_DOWN(size);
286 int rc;
287
288 if (WARN_ON_ONCE(params->altmap))
289 return -EINVAL;
290
291 if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
292 return -EINVAL;
293
294 VM_BUG_ON(!mhp_range_allowed(start, size, true));
295 rc = vmem_add_mapping(start, size);
296 if (rc)
297 return rc;
298
299 rc = __add_pages(nid, start_pfn, size_pages, params);
300 if (rc)
301 vmem_remove_mapping(start, size);
302 return rc;
303}
304
305void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
306{
307 unsigned long start_pfn = start >> PAGE_SHIFT;
308 unsigned long nr_pages = size >> PAGE_SHIFT;
309
310 __remove_pages(start_pfn, nr_pages, altmap);
311 vmem_remove_mapping(start, size);
312}
313#endif /* CONFIG_MEMORY_HOTPLUG */