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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 <asm/processor.h>
35#include <linux/uaccess.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>
41#include <asm/sections.h>
42#include <asm/ctl_reg.h>
43#include <asm/sclp.h>
44#include <asm/set_memory.h>
45#include <asm/kasan.h>
46#include <asm/dma-mapping.h>
47#include <asm/uv.h>
48
49pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
50
51unsigned long empty_zero_page, zero_page_mask;
52EXPORT_SYMBOL(empty_zero_page);
53EXPORT_SYMBOL(zero_page_mask);
54
55bool initmem_freed;
56
57static void __init setup_zero_pages(void)
58{
59 unsigned int order;
60 struct page *page;
61 int i;
62
63 /* Latest machines require a mapping granularity of 512KB */
64 order = 7;
65
66 /* Limit number of empty zero pages for small memory sizes */
67 while (order > 2 && (totalram_pages() >> 10) < (1UL << order))
68 order--;
69
70 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
71 if (!empty_zero_page)
72 panic("Out of memory in setup_zero_pages");
73
74 page = virt_to_page((void *) empty_zero_page);
75 split_page(page, order);
76 for (i = 1 << order; i > 0; i--) {
77 mark_page_reserved(page);
78 page++;
79 }
80
81 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
82}
83
84/*
85 * paging_init() sets up the page tables
86 */
87void __init paging_init(void)
88{
89 unsigned long max_zone_pfns[MAX_NR_ZONES];
90 unsigned long pgd_type, asce_bits;
91 psw_t psw;
92
93 init_mm.pgd = swapper_pg_dir;
94 if (VMALLOC_END > _REGION2_SIZE) {
95 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
96 pgd_type = _REGION2_ENTRY_EMPTY;
97 } else {
98 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
99 pgd_type = _REGION3_ENTRY_EMPTY;
100 }
101 init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
102 S390_lowcore.kernel_asce = init_mm.context.asce;
103 S390_lowcore.user_asce = S390_lowcore.kernel_asce;
104 crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
105 vmem_map_init();
106 kasan_copy_shadow(init_mm.pgd);
107
108 /* enable virtual mapping in kernel mode */
109 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
110 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
111 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
112 psw.mask = __extract_psw();
113 psw_bits(psw).dat = 1;
114 psw_bits(psw).as = PSW_BITS_AS_HOME;
115 __load_psw_mask(psw.mask);
116 kasan_free_early_identity();
117
118 sparse_init();
119 zone_dma_bits = 31;
120 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
121 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
122 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
123 free_area_init(max_zone_pfns);
124}
125
126void mark_rodata_ro(void)
127{
128 unsigned long size = __end_ro_after_init - __start_ro_after_init;
129
130 set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT);
131 pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
132}
133
134int set_memory_encrypted(unsigned long addr, int numpages)
135{
136 int i;
137
138 /* make specified pages unshared, (swiotlb, dma_free) */
139 for (i = 0; i < numpages; ++i) {
140 uv_remove_shared(addr);
141 addr += PAGE_SIZE;
142 }
143 return 0;
144}
145
146int set_memory_decrypted(unsigned long addr, int numpages)
147{
148 int i;
149 /* make specified pages shared (swiotlb, dma_alloca) */
150 for (i = 0; i < numpages; ++i) {
151 uv_set_shared(addr);
152 addr += PAGE_SIZE;
153 }
154 return 0;
155}
156
157/* are we a protected virtualization guest? */
158bool force_dma_unencrypted(struct device *dev)
159{
160 return is_prot_virt_guest();
161}
162
163/* protected virtualization */
164static void pv_init(void)
165{
166 if (!is_prot_virt_guest())
167 return;
168
169 /* make sure bounce buffers are shared */
170 swiotlb_init(1);
171 swiotlb_update_mem_attributes();
172 swiotlb_force = SWIOTLB_FORCE;
173}
174
175void __init mem_init(void)
176{
177 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
178 cpumask_set_cpu(0, mm_cpumask(&init_mm));
179
180 set_max_mapnr(max_low_pfn);
181 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
182
183 pv_init();
184
185 /* Setup guest page hinting */
186 cmma_init();
187
188 /* this will put all low memory onto the freelists */
189 memblock_free_all();
190 setup_zero_pages(); /* Setup zeroed pages. */
191
192 cmma_init_nodat();
193
194 mem_init_print_info(NULL);
195}
196
197void free_initmem(void)
198{
199 initmem_freed = true;
200 __set_memory((unsigned long)_sinittext,
201 (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
202 SET_MEMORY_RW | SET_MEMORY_NX);
203 free_initmem_default(POISON_FREE_INITMEM);
204}
205
206unsigned long memory_block_size_bytes(void)
207{
208 /*
209 * Make sure the memory block size is always greater
210 * or equal than the memory increment size.
211 */
212 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
213}
214
215#ifdef CONFIG_MEMORY_HOTPLUG
216
217#ifdef CONFIG_CMA
218
219/* Prevent memory blocks which contain cma regions from going offline */
220
221struct s390_cma_mem_data {
222 unsigned long start;
223 unsigned long end;
224};
225
226static int s390_cma_check_range(struct cma *cma, void *data)
227{
228 struct s390_cma_mem_data *mem_data;
229 unsigned long start, end;
230
231 mem_data = data;
232 start = cma_get_base(cma);
233 end = start + cma_get_size(cma);
234 if (end < mem_data->start)
235 return 0;
236 if (start >= mem_data->end)
237 return 0;
238 return -EBUSY;
239}
240
241static int s390_cma_mem_notifier(struct notifier_block *nb,
242 unsigned long action, void *data)
243{
244 struct s390_cma_mem_data mem_data;
245 struct memory_notify *arg;
246 int rc = 0;
247
248 arg = data;
249 mem_data.start = arg->start_pfn << PAGE_SHIFT;
250 mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
251 if (action == MEM_GOING_OFFLINE)
252 rc = cma_for_each_area(s390_cma_check_range, &mem_data);
253 return notifier_from_errno(rc);
254}
255
256static struct notifier_block s390_cma_mem_nb = {
257 .notifier_call = s390_cma_mem_notifier,
258};
259
260static int __init s390_cma_mem_init(void)
261{
262 return register_memory_notifier(&s390_cma_mem_nb);
263}
264device_initcall(s390_cma_mem_init);
265
266#endif /* CONFIG_CMA */
267
268int arch_add_memory(int nid, u64 start, u64 size,
269 struct mhp_params *params)
270{
271 unsigned long start_pfn = PFN_DOWN(start);
272 unsigned long size_pages = PFN_DOWN(size);
273 int rc;
274
275 if (WARN_ON_ONCE(params->altmap))
276 return -EINVAL;
277
278 if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
279 return -EINVAL;
280
281 rc = vmem_add_mapping(start, size);
282 if (rc)
283 return rc;
284
285 rc = __add_pages(nid, start_pfn, size_pages, params);
286 if (rc)
287 vmem_remove_mapping(start, size);
288 return rc;
289}
290
291void arch_remove_memory(int nid, u64 start, u64 size,
292 struct vmem_altmap *altmap)
293{
294 unsigned long start_pfn = start >> PAGE_SHIFT;
295 unsigned long nr_pages = size >> PAGE_SHIFT;
296
297 __remove_pages(start_pfn, nr_pages, altmap);
298 vmem_remove_mapping(start, size);
299}
300#endif /* CONFIG_MEMORY_HOTPLUG */
1/*
2 * S390 version
3 * Copyright IBM Corp. 1999
4 * Author(s): Hartmut Penner (hp@de.ibm.com)
5 *
6 * Derived from "arch/i386/mm/init.c"
7 * Copyright (C) 1995 Linus Torvalds
8 */
9
10#include <linux/signal.h>
11#include <linux/sched.h>
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/string.h>
15#include <linux/types.h>
16#include <linux/ptrace.h>
17#include <linux/mman.h>
18#include <linux/mm.h>
19#include <linux/swap.h>
20#include <linux/smp.h>
21#include <linux/init.h>
22#include <linux/pagemap.h>
23#include <linux/bootmem.h>
24#include <linux/memory.h>
25#include <linux/pfn.h>
26#include <linux/poison.h>
27#include <linux/initrd.h>
28#include <linux/export.h>
29#include <linux/gfp.h>
30#include <linux/memblock.h>
31#include <asm/processor.h>
32#include <asm/uaccess.h>
33#include <asm/pgtable.h>
34#include <asm/pgalloc.h>
35#include <asm/dma.h>
36#include <asm/lowcore.h>
37#include <asm/tlb.h>
38#include <asm/tlbflush.h>
39#include <asm/sections.h>
40#include <asm/ctl_reg.h>
41#include <asm/sclp.h>
42
43pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
44
45unsigned long empty_zero_page, zero_page_mask;
46EXPORT_SYMBOL(empty_zero_page);
47EXPORT_SYMBOL(zero_page_mask);
48
49static void __init setup_zero_pages(void)
50{
51 unsigned int order;
52 struct page *page;
53 int i;
54
55 /* Latest machines require a mapping granularity of 512KB */
56 order = 7;
57
58 /* Limit number of empty zero pages for small memory sizes */
59 while (order > 2 && (totalram_pages >> 10) < (1UL << order))
60 order--;
61
62 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
63 if (!empty_zero_page)
64 panic("Out of memory in setup_zero_pages");
65
66 page = virt_to_page((void *) empty_zero_page);
67 split_page(page, order);
68 for (i = 1 << order; i > 0; i--) {
69 mark_page_reserved(page);
70 page++;
71 }
72
73 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
74}
75
76/*
77 * paging_init() sets up the page tables
78 */
79void __init paging_init(void)
80{
81 unsigned long max_zone_pfns[MAX_NR_ZONES];
82 unsigned long pgd_type, asce_bits;
83
84 init_mm.pgd = swapper_pg_dir;
85 if (VMALLOC_END > (1UL << 42)) {
86 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
87 pgd_type = _REGION2_ENTRY_EMPTY;
88 } else {
89 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
90 pgd_type = _REGION3_ENTRY_EMPTY;
91 }
92 init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
93 S390_lowcore.kernel_asce = init_mm.context.asce;
94 clear_table((unsigned long *) init_mm.pgd, pgd_type,
95 sizeof(unsigned long)*2048);
96 vmem_map_init();
97
98 /* enable virtual mapping in kernel mode */
99 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
100 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
101 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
102 __arch_local_irq_stosm(0x04);
103
104 sparse_memory_present_with_active_regions(MAX_NUMNODES);
105 sparse_init();
106 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
107 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
108 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
109 free_area_init_nodes(max_zone_pfns);
110}
111
112void mark_rodata_ro(void)
113{
114 /* Text and rodata are already protected. Nothing to do here. */
115 pr_info("Write protecting the kernel read-only data: %luk\n",
116 ((unsigned long)&_eshared - (unsigned long)&_stext) >> 10);
117}
118
119void __init mem_init(void)
120{
121 if (MACHINE_HAS_TLB_LC)
122 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
123 cpumask_set_cpu(0, mm_cpumask(&init_mm));
124 atomic_set(&init_mm.context.attach_count, 1);
125
126 set_max_mapnr(max_low_pfn);
127 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
128
129 /* Setup guest page hinting */
130 cmma_init();
131
132 /* this will put all low memory onto the freelists */
133 free_all_bootmem();
134 setup_zero_pages(); /* Setup zeroed pages. */
135
136 mem_init_print_info(NULL);
137}
138
139void free_initmem(void)
140{
141 free_initmem_default(POISON_FREE_INITMEM);
142}
143
144#ifdef CONFIG_BLK_DEV_INITRD
145void __init free_initrd_mem(unsigned long start, unsigned long end)
146{
147 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
148 "initrd");
149}
150#endif
151
152#ifdef CONFIG_MEMORY_HOTPLUG
153int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
154{
155 unsigned long normal_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
156 unsigned long dma_end_pfn = PFN_DOWN(MAX_DMA_ADDRESS);
157 unsigned long start_pfn = PFN_DOWN(start);
158 unsigned long size_pages = PFN_DOWN(size);
159 unsigned long nr_pages;
160 int rc, zone_enum;
161
162 rc = vmem_add_mapping(start, size);
163 if (rc)
164 return rc;
165
166 while (size_pages > 0) {
167 if (start_pfn < dma_end_pfn) {
168 nr_pages = (start_pfn + size_pages > dma_end_pfn) ?
169 dma_end_pfn - start_pfn : size_pages;
170 zone_enum = ZONE_DMA;
171 } else if (start_pfn < normal_end_pfn) {
172 nr_pages = (start_pfn + size_pages > normal_end_pfn) ?
173 normal_end_pfn - start_pfn : size_pages;
174 zone_enum = ZONE_NORMAL;
175 } else {
176 nr_pages = size_pages;
177 zone_enum = ZONE_MOVABLE;
178 }
179 rc = __add_pages(nid, NODE_DATA(nid)->node_zones + zone_enum,
180 start_pfn, size_pages);
181 if (rc)
182 break;
183 start_pfn += nr_pages;
184 size_pages -= nr_pages;
185 }
186 if (rc)
187 vmem_remove_mapping(start, size);
188 return rc;
189}
190
191unsigned long memory_block_size_bytes(void)
192{
193 /*
194 * Make sure the memory block size is always greater
195 * or equal than the memory increment size.
196 */
197 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
198}
199
200#ifdef CONFIG_MEMORY_HOTREMOVE
201int arch_remove_memory(u64 start, u64 size)
202{
203 /*
204 * There is no hardware or firmware interface which could trigger a
205 * hot memory remove on s390. So there is nothing that needs to be
206 * implemented.
207 */
208 return -EBUSY;
209}
210#endif
211#endif /* CONFIG_MEMORY_HOTPLUG */