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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/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#include <linux/execmem.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
57struct ctlreg __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 long total_pages = memblock_estimated_nr_free_pages();
66 unsigned int order;
67 struct page *page;
68 int i;
69
70 /* Latest machines require a mapping granularity of 512KB */
71 order = 7;
72
73 /* Limit number of empty zero pages for small memory sizes */
74 while (order > 2 && (total_pages >> 10) < (1UL << order))
75 order--;
76
77 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
78 if (!empty_zero_page)
79 panic("Out of memory in setup_zero_pages");
80
81 page = virt_to_page((void *) empty_zero_page);
82 split_page(page, order);
83 for (i = 1 << order; i > 0; i--) {
84 mark_page_reserved(page);
85 page++;
86 }
87
88 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
89}
90
91/*
92 * paging_init() sets up the page tables
93 */
94void __init paging_init(void)
95{
96 unsigned long max_zone_pfns[MAX_NR_ZONES];
97
98 vmem_map_init();
99 sparse_init();
100 zone_dma_limit = DMA_BIT_MASK(31);
101 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
102 max_zone_pfns[ZONE_DMA] = virt_to_pfn(MAX_DMA_ADDRESS);
103 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
104 free_area_init(max_zone_pfns);
105}
106
107void mark_rodata_ro(void)
108{
109 unsigned long size = __end_ro_after_init - __start_ro_after_init;
110
111 if (MACHINE_HAS_NX)
112 system_ctl_set_bit(0, CR0_INSTRUCTION_EXEC_PROTECTION_BIT);
113 __set_memory_ro(__start_ro_after_init, __end_ro_after_init);
114 pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
115}
116
117int set_memory_encrypted(unsigned long vaddr, int numpages)
118{
119 int i;
120
121 /* make specified pages unshared, (swiotlb, dma_free) */
122 for (i = 0; i < numpages; ++i) {
123 uv_remove_shared(virt_to_phys((void *)vaddr));
124 vaddr += PAGE_SIZE;
125 }
126 return 0;
127}
128
129int set_memory_decrypted(unsigned long vaddr, int numpages)
130{
131 int i;
132 /* make specified pages shared (swiotlb, dma_alloca) */
133 for (i = 0; i < numpages; ++i) {
134 uv_set_shared(virt_to_phys((void *)vaddr));
135 vaddr += PAGE_SIZE;
136 }
137 return 0;
138}
139
140/* are we a protected virtualization guest? */
141bool force_dma_unencrypted(struct device *dev)
142{
143 return is_prot_virt_guest();
144}
145
146/* protected virtualization */
147static void pv_init(void)
148{
149 if (!is_prot_virt_guest())
150 return;
151
152 virtio_set_mem_acc_cb(virtio_require_restricted_mem_acc);
153
154 /* make sure bounce buffers are shared */
155 swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE);
156 swiotlb_update_mem_attributes();
157}
158
159void __init mem_init(void)
160{
161 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
162 cpumask_set_cpu(0, mm_cpumask(&init_mm));
163
164 set_max_mapnr(max_low_pfn);
165 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
166
167 pv_init();
168 kfence_split_mapping();
169
170 /* this will put all low memory onto the freelists */
171 memblock_free_all();
172 setup_zero_pages(); /* Setup zeroed pages. */
173}
174
175unsigned long memory_block_size_bytes(void)
176{
177 /*
178 * Make sure the memory block size is always greater
179 * or equal than the memory increment size.
180 */
181 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
182}
183
184unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
185EXPORT_SYMBOL(__per_cpu_offset);
186
187static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
188{
189 return LOCAL_DISTANCE;
190}
191
192static int __init pcpu_cpu_to_node(int cpu)
193{
194 return 0;
195}
196
197void __init setup_per_cpu_areas(void)
198{
199 unsigned long delta;
200 unsigned int cpu;
201 int rc;
202
203 /*
204 * Always reserve area for module percpu variables. That's
205 * what the legacy allocator did.
206 */
207 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
208 PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
209 pcpu_cpu_distance,
210 pcpu_cpu_to_node);
211 if (rc < 0)
212 panic("Failed to initialize percpu areas.");
213
214 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
215 for_each_possible_cpu(cpu)
216 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
217}
218
219#ifdef CONFIG_MEMORY_HOTPLUG
220
221#ifdef CONFIG_CMA
222
223/* Prevent memory blocks which contain cma regions from going offline */
224
225struct s390_cma_mem_data {
226 unsigned long start;
227 unsigned long end;
228};
229
230static int s390_cma_check_range(struct cma *cma, void *data)
231{
232 struct s390_cma_mem_data *mem_data;
233 unsigned long start, end;
234
235 mem_data = data;
236 start = cma_get_base(cma);
237 end = start + cma_get_size(cma);
238 if (end < mem_data->start)
239 return 0;
240 if (start >= mem_data->end)
241 return 0;
242 return -EBUSY;
243}
244
245static int s390_cma_mem_notifier(struct notifier_block *nb,
246 unsigned long action, void *data)
247{
248 struct s390_cma_mem_data mem_data;
249 struct memory_notify *arg;
250 int rc = 0;
251
252 arg = data;
253 mem_data.start = arg->start_pfn << PAGE_SHIFT;
254 mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
255 if (action == MEM_GOING_OFFLINE)
256 rc = cma_for_each_area(s390_cma_check_range, &mem_data);
257 return notifier_from_errno(rc);
258}
259
260static struct notifier_block s390_cma_mem_nb = {
261 .notifier_call = s390_cma_mem_notifier,
262};
263
264static int __init s390_cma_mem_init(void)
265{
266 return register_memory_notifier(&s390_cma_mem_nb);
267}
268device_initcall(s390_cma_mem_init);
269
270#endif /* CONFIG_CMA */
271
272int arch_add_memory(int nid, u64 start, u64 size,
273 struct mhp_params *params)
274{
275 unsigned long start_pfn = PFN_DOWN(start);
276 unsigned long size_pages = PFN_DOWN(size);
277 int rc;
278
279 if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
280 return -EINVAL;
281
282 VM_BUG_ON(!mhp_range_allowed(start, size, true));
283 rc = vmem_add_mapping(start, size);
284 if (rc)
285 return rc;
286
287 rc = __add_pages(nid, start_pfn, size_pages, params);
288 if (rc)
289 vmem_remove_mapping(start, size);
290 return rc;
291}
292
293void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
294{
295 unsigned long start_pfn = start >> PAGE_SHIFT;
296 unsigned long nr_pages = size >> PAGE_SHIFT;
297
298 __remove_pages(start_pfn, nr_pages, altmap);
299 vmem_remove_mapping(start, size);
300}
301#endif /* CONFIG_MEMORY_HOTPLUG */
302
303#ifdef CONFIG_EXECMEM
304static struct execmem_info execmem_info __ro_after_init;
305
306struct execmem_info __init *execmem_arch_setup(void)
307{
308 unsigned long module_load_offset = 0;
309 unsigned long start;
310
311 if (kaslr_enabled())
312 module_load_offset = get_random_u32_inclusive(1, 1024) * PAGE_SIZE;
313
314 start = MODULES_VADDR + module_load_offset;
315
316 execmem_info = (struct execmem_info){
317 .ranges = {
318 [EXECMEM_DEFAULT] = {
319 .flags = EXECMEM_KASAN_SHADOW,
320 .start = start,
321 .end = MODULES_END,
322 .pgprot = PAGE_KERNEL,
323 .alignment = MODULE_ALIGN,
324 },
325 },
326 };
327
328 return &execmem_info;
329}
330#endif /* CONFIG_EXECMEM */
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 <asm/processor.h>
35#include <linux/uaccess.h>
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>
42#include <asm/sections.h>
43#include <asm/ctl_reg.h>
44#include <asm/sclp.h>
45#include <asm/set_memory.h>
46#include <asm/kasan.h>
47#include <asm/dma-mapping.h>
48#include <asm/uv.h>
49
50pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
51
52unsigned long empty_zero_page, zero_page_mask;
53EXPORT_SYMBOL(empty_zero_page);
54EXPORT_SYMBOL(zero_page_mask);
55
56bool initmem_freed;
57
58static void __init setup_zero_pages(void)
59{
60 unsigned int order;
61 struct page *page;
62 int i;
63
64 /* Latest machines require a mapping granularity of 512KB */
65 order = 7;
66
67 /* Limit number of empty zero pages for small memory sizes */
68 while (order > 2 && (totalram_pages() >> 10) < (1UL << order))
69 order--;
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--) {
78 mark_page_reserved(page);
79 page++;
80 }
81
82 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
83}
84
85/*
86 * paging_init() sets up the page tables
87 */
88void __init paging_init(void)
89{
90 unsigned long max_zone_pfns[MAX_NR_ZONES];
91 unsigned long pgd_type, asce_bits;
92 psw_t psw;
93
94 init_mm.pgd = swapper_pg_dir;
95 if (VMALLOC_END > _REGION2_SIZE) {
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 }
102 init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
103 S390_lowcore.kernel_asce = init_mm.context.asce;
104 S390_lowcore.user_asce = S390_lowcore.kernel_asce;
105 crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
106 vmem_map_init();
107 kasan_copy_shadow(init_mm.pgd);
108
109 /* enable virtual mapping in kernel mode */
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);
113 psw.mask = __extract_psw();
114 psw_bits(psw).dat = 1;
115 psw_bits(psw).as = PSW_BITS_AS_HOME;
116 __load_psw_mask(psw.mask);
117 kasan_free_early_identity();
118
119 sparse_memory_present_with_active_regions(MAX_NUMNODES);
120 sparse_init();
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);
125}
126
127void mark_rodata_ro(void)
128{
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);
133}
134
135int 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
147int 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? */
159bool force_dma_unencrypted(struct device *dev)
160{
161 return is_prot_virt_guest();
162}
163
164/* protected virtualization */
165static void pv_init(void)
166{
167 if (!is_prot_virt_guest())
168 return;
169
170 /* make sure bounce buffers are shared */
171 swiotlb_init(1);
172 swiotlb_update_mem_attributes();
173 swiotlb_force = SWIOTLB_FORCE;
174}
175
176void __init mem_init(void)
177{
178 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
179 cpumask_set_cpu(0, mm_cpumask(&init_mm));
180
181 set_max_mapnr(max_low_pfn);
182 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
183
184 pv_init();
185
186 /* Setup guest page hinting */
187 cmma_init();
188
189 /* this will put all low memory onto the freelists */
190 memblock_free_all();
191 setup_zero_pages(); /* Setup zeroed pages. */
192
193 cmma_init_nodat();
194
195 mem_init_print_info(NULL);
196}
197
198void free_initmem(void)
199{
200 initmem_freed = true;
201 __set_memory((unsigned long)_sinittext,
202 (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
203 SET_MEMORY_RW | SET_MEMORY_NX);
204 free_initmem_default(POISON_FREE_INITMEM);
205}
206
207unsigned long memory_block_size_bytes(void)
208{
209 /*
210 * Make sure the memory block size is always greater
211 * or equal than the memory increment size.
212 */
213 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
214}
215
216#ifdef CONFIG_MEMORY_HOTPLUG
217
218#ifdef CONFIG_CMA
219
220/* Prevent memory blocks which contain cma regions from going offline */
221
222struct s390_cma_mem_data {
223 unsigned long start;
224 unsigned long end;
225};
226
227static int s390_cma_check_range(struct cma *cma, void *data)
228{
229 struct s390_cma_mem_data *mem_data;
230 unsigned long start, end;
231
232 mem_data = data;
233 start = cma_get_base(cma);
234 end = start + cma_get_size(cma);
235 if (end < mem_data->start)
236 return 0;
237 if (start >= mem_data->end)
238 return 0;
239 return -EBUSY;
240}
241
242static int s390_cma_mem_notifier(struct notifier_block *nb,
243 unsigned long action, void *data)
244{
245 struct s390_cma_mem_data mem_data;
246 struct memory_notify *arg;
247 int rc = 0;
248
249 arg = data;
250 mem_data.start = arg->start_pfn << PAGE_SHIFT;
251 mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
252 if (action == MEM_GOING_OFFLINE)
253 rc = cma_for_each_area(s390_cma_check_range, &mem_data);
254 return notifier_from_errno(rc);
255}
256
257static struct notifier_block s390_cma_mem_nb = {
258 .notifier_call = s390_cma_mem_notifier,
259};
260
261static int __init s390_cma_mem_init(void)
262{
263 return register_memory_notifier(&s390_cma_mem_nb);
264}
265device_initcall(s390_cma_mem_init);
266
267#endif /* CONFIG_CMA */
268
269int arch_add_memory(int nid, u64 start, u64 size,
270 struct mhp_restrictions *restrictions)
271{
272 unsigned long start_pfn = PFN_DOWN(start);
273 unsigned long size_pages = PFN_DOWN(size);
274 int rc;
275
276 if (WARN_ON_ONCE(restrictions->altmap))
277 return -EINVAL;
278
279 rc = vmem_add_mapping(start, size);
280 if (rc)
281 return rc;
282
283 rc = __add_pages(nid, start_pfn, size_pages, restrictions);
284 if (rc)
285 vmem_remove_mapping(start, size);
286 return rc;
287}
288
289void arch_remove_memory(int nid, u64 start, u64 size,
290 struct vmem_altmap *altmap)
291{
292 unsigned long start_pfn = start >> PAGE_SHIFT;
293 unsigned long nr_pages = size >> PAGE_SHIFT;
294 struct zone *zone;
295
296 zone = page_zone(pfn_to_page(start_pfn));
297 __remove_pages(zone, start_pfn, nr_pages, altmap);
298 vmem_remove_mapping(start, size);
299}
300#endif /* CONFIG_MEMORY_HOTPLUG */