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1/*
2 * arch/s390/mm/init.c
3 *
4 * S390 version
5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com)
7 *
8 * Derived from "arch/i386/mm/init.c"
9 * Copyright (C) 1995 Linus Torvalds
10 */
11
12#include <linux/signal.h>
13#include <linux/sched.h>
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/string.h>
17#include <linux/types.h>
18#include <linux/ptrace.h>
19#include <linux/mman.h>
20#include <linux/mm.h>
21#include <linux/swap.h>
22#include <linux/smp.h>
23#include <linux/init.h>
24#include <linux/pagemap.h>
25#include <linux/bootmem.h>
26#include <linux/pfn.h>
27#include <linux/poison.h>
28#include <linux/initrd.h>
29#include <linux/export.h>
30#include <linux/gfp.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
42pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
43
44unsigned long empty_zero_page, zero_page_mask;
45EXPORT_SYMBOL(empty_zero_page);
46
47static unsigned long setup_zero_pages(void)
48{
49 struct cpuid cpu_id;
50 unsigned int order;
51 unsigned long size;
52 struct page *page;
53 int i;
54
55 get_cpu_id(&cpu_id);
56 switch (cpu_id.machine) {
57 case 0x9672: /* g5 */
58 case 0x2064: /* z900 */
59 case 0x2066: /* z900 */
60 case 0x2084: /* z990 */
61 case 0x2086: /* z990 */
62 case 0x2094: /* z9-109 */
63 case 0x2096: /* z9-109 */
64 order = 0;
65 break;
66 case 0x2097: /* z10 */
67 case 0x2098: /* z10 */
68 default:
69 order = 2;
70 break;
71 }
72
73 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
74 if (!empty_zero_page)
75 panic("Out of memory in setup_zero_pages");
76
77 page = virt_to_page((void *) empty_zero_page);
78 split_page(page, order);
79 for (i = 1 << order; i > 0; i--) {
80 SetPageReserved(page);
81 page++;
82 }
83
84 size = PAGE_SIZE << order;
85 zero_page_mask = (size - 1) & PAGE_MASK;
86
87 return 1UL << order;
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 unsigned long pgd_type, asce_bits;
97
98 init_mm.pgd = swapper_pg_dir;
99#ifdef CONFIG_64BIT
100 if (VMALLOC_END > (1UL << 42)) {
101 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
102 pgd_type = _REGION2_ENTRY_EMPTY;
103 } else {
104 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
105 pgd_type = _REGION3_ENTRY_EMPTY;
106 }
107#else
108 asce_bits = _ASCE_TABLE_LENGTH;
109 pgd_type = _SEGMENT_ENTRY_EMPTY;
110#endif
111 S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
112 clear_table((unsigned long *) init_mm.pgd, pgd_type,
113 sizeof(unsigned long)*2048);
114 vmem_map_init();
115
116 /* enable virtual mapping in kernel mode */
117 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
118 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
119 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
120 arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
121
122 atomic_set(&init_mm.context.attach_count, 1);
123
124 sparse_memory_present_with_active_regions(MAX_NUMNODES);
125 sparse_init();
126 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
127 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
128 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
129 free_area_init_nodes(max_zone_pfns);
130 fault_init();
131}
132
133void __init mem_init(void)
134{
135 unsigned long codesize, reservedpages, datasize, initsize;
136
137 max_mapnr = num_physpages = max_low_pfn;
138 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
139
140 /* Setup guest page hinting */
141 cmma_init();
142
143 /* this will put all low memory onto the freelists */
144 totalram_pages += free_all_bootmem();
145 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
146
147 reservedpages = 0;
148
149 codesize = (unsigned long) &_etext - (unsigned long) &_text;
150 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
151 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
152 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
153 nr_free_pages() << (PAGE_SHIFT-10),
154 max_mapnr << (PAGE_SHIFT-10),
155 codesize >> 10,
156 reservedpages << (PAGE_SHIFT-10),
157 datasize >>10,
158 initsize >> 10);
159 printk("Write protected kernel read-only data: %#lx - %#lx\n",
160 (unsigned long)&_stext,
161 PFN_ALIGN((unsigned long)&_eshared) - 1);
162}
163
164#ifdef CONFIG_DEBUG_PAGEALLOC
165void kernel_map_pages(struct page *page, int numpages, int enable)
166{
167 pgd_t *pgd;
168 pud_t *pud;
169 pmd_t *pmd;
170 pte_t *pte;
171 unsigned long address;
172 int i;
173
174 for (i = 0; i < numpages; i++) {
175 address = page_to_phys(page + i);
176 pgd = pgd_offset_k(address);
177 pud = pud_offset(pgd, address);
178 pmd = pmd_offset(pud, address);
179 pte = pte_offset_kernel(pmd, address);
180 if (!enable) {
181 __ptep_ipte(address, pte);
182 pte_val(*pte) = _PAGE_TYPE_EMPTY;
183 continue;
184 }
185 *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
186 /* Flush cpu write queue. */
187 mb();
188 }
189}
190#endif
191
192void free_init_pages(char *what, unsigned long begin, unsigned long end)
193{
194 unsigned long addr = begin;
195
196 if (begin >= end)
197 return;
198 for (; addr < end; addr += PAGE_SIZE) {
199 ClearPageReserved(virt_to_page(addr));
200 init_page_count(virt_to_page(addr));
201 memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
202 PAGE_SIZE);
203 free_page(addr);
204 totalram_pages++;
205 }
206 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
207}
208
209void free_initmem(void)
210{
211 free_init_pages("unused kernel memory",
212 (unsigned long)&__init_begin,
213 (unsigned long)&__init_end);
214}
215
216#ifdef CONFIG_BLK_DEV_INITRD
217void free_initrd_mem(unsigned long start, unsigned long end)
218{
219 free_init_pages("initrd memory", start, end);
220}
221#endif
222
223#ifdef CONFIG_MEMORY_HOTPLUG
224int arch_add_memory(int nid, u64 start, u64 size)
225{
226 unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
227 unsigned long start_pfn = PFN_DOWN(start);
228 unsigned long size_pages = PFN_DOWN(size);
229 struct zone *zone;
230 int rc;
231
232 rc = vmem_add_mapping(start, size);
233 if (rc)
234 return rc;
235 for_each_zone(zone) {
236 if (zone_idx(zone) != ZONE_MOVABLE) {
237 /* Add range within existing zone limits */
238 zone_start_pfn = zone->zone_start_pfn;
239 zone_end_pfn = zone->zone_start_pfn +
240 zone->spanned_pages;
241 } else {
242 /* Add remaining range to ZONE_MOVABLE */
243 zone_start_pfn = start_pfn;
244 zone_end_pfn = start_pfn + size_pages;
245 }
246 if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn)
247 continue;
248 nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
249 zone_end_pfn - start_pfn : size_pages;
250 rc = __add_pages(nid, zone, start_pfn, nr_pages);
251 if (rc)
252 break;
253 start_pfn += nr_pages;
254 size_pages -= nr_pages;
255 if (!size_pages)
256 break;
257 }
258 if (rc)
259 vmem_remove_mapping(start, size);
260 return rc;
261}
262#endif /* CONFIG_MEMORY_HOTPLUG */
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/smp.h>
22#include <linux/init.h>
23#include <linux/pagemap.h>
24#include <linux/bootmem.h>
25#include <linux/memory.h>
26#include <linux/pfn.h>
27#include <linux/poison.h>
28#include <linux/initrd.h>
29#include <linux/export.h>
30#include <linux/cma.h>
31#include <linux/gfp.h>
32#include <linux/memblock.h>
33#include <asm/processor.h>
34#include <linux/uaccess.h>
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>
41#include <asm/sections.h>
42#include <asm/ctl_reg.h>
43#include <asm/sclp.h>
44#include <asm/set_memory.h>
45
46pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
47
48unsigned long empty_zero_page, zero_page_mask;
49EXPORT_SYMBOL(empty_zero_page);
50EXPORT_SYMBOL(zero_page_mask);
51
52static void __init setup_zero_pages(void)
53{
54 unsigned int order;
55 struct page *page;
56 int i;
57
58 /* Latest machines require a mapping granularity of 512KB */
59 order = 7;
60
61 /* Limit number of empty zero pages for small memory sizes */
62 while (order > 2 && (totalram_pages >> 10) < (1UL << order))
63 order--;
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--) {
72 mark_page_reserved(page);
73 page++;
74 }
75
76 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
77}
78
79/*
80 * paging_init() sets up the page tables
81 */
82void __init paging_init(void)
83{
84 unsigned long max_zone_pfns[MAX_NR_ZONES];
85 unsigned long pgd_type, asce_bits;
86 psw_t psw;
87
88 init_mm.pgd = swapper_pg_dir;
89 if (VMALLOC_END > _REGION2_SIZE) {
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 }
96 init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
97 S390_lowcore.kernel_asce = init_mm.context.asce;
98 S390_lowcore.user_asce = S390_lowcore.kernel_asce;
99 crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
100 vmem_map_init();
101
102 /* enable virtual mapping in kernel mode */
103 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
104 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
105 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
106 psw.mask = __extract_psw();
107 psw_bits(psw).dat = 1;
108 psw_bits(psw).as = PSW_BITS_AS_HOME;
109 __load_psw_mask(psw.mask);
110
111 sparse_memory_present_with_active_regions(MAX_NUMNODES);
112 sparse_init();
113 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
114 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
115 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
116 free_area_init_nodes(max_zone_pfns);
117}
118
119void mark_rodata_ro(void)
120{
121 unsigned long size = __end_ro_after_init - __start_ro_after_init;
122
123 set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT);
124 pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
125}
126
127void __init mem_init(void)
128{
129 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
130 cpumask_set_cpu(0, mm_cpumask(&init_mm));
131
132 set_max_mapnr(max_low_pfn);
133 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
134
135 /* Setup guest page hinting */
136 cmma_init();
137
138 /* this will put all low memory onto the freelists */
139 free_all_bootmem();
140 setup_zero_pages(); /* Setup zeroed pages. */
141
142 cmma_init_nodat();
143
144 mem_init_print_info(NULL);
145}
146
147void free_initmem(void)
148{
149 __set_memory((unsigned long)_sinittext,
150 (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
151 SET_MEMORY_RW | SET_MEMORY_NX);
152 free_initmem_default(POISON_FREE_INITMEM);
153}
154
155#ifdef CONFIG_BLK_DEV_INITRD
156void __init free_initrd_mem(unsigned long start, unsigned long end)
157{
158 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
159 "initrd");
160}
161#endif
162
163unsigned long memory_block_size_bytes(void)
164{
165 /*
166 * Make sure the memory block size is always greater
167 * or equal than the memory increment size.
168 */
169 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
170}
171
172#ifdef CONFIG_MEMORY_HOTPLUG
173
174#ifdef CONFIG_CMA
175
176/* Prevent memory blocks which contain cma regions from going offline */
177
178struct s390_cma_mem_data {
179 unsigned long start;
180 unsigned long end;
181};
182
183static int s390_cma_check_range(struct cma *cma, void *data)
184{
185 struct s390_cma_mem_data *mem_data;
186 unsigned long start, end;
187
188 mem_data = data;
189 start = cma_get_base(cma);
190 end = start + cma_get_size(cma);
191 if (end < mem_data->start)
192 return 0;
193 if (start >= mem_data->end)
194 return 0;
195 return -EBUSY;
196}
197
198static int s390_cma_mem_notifier(struct notifier_block *nb,
199 unsigned long action, void *data)
200{
201 struct s390_cma_mem_data mem_data;
202 struct memory_notify *arg;
203 int rc = 0;
204
205 arg = data;
206 mem_data.start = arg->start_pfn << PAGE_SHIFT;
207 mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
208 if (action == MEM_GOING_OFFLINE)
209 rc = cma_for_each_area(s390_cma_check_range, &mem_data);
210 return notifier_from_errno(rc);
211}
212
213static struct notifier_block s390_cma_mem_nb = {
214 .notifier_call = s390_cma_mem_notifier,
215};
216
217static int __init s390_cma_mem_init(void)
218{
219 return register_memory_notifier(&s390_cma_mem_nb);
220}
221device_initcall(s390_cma_mem_init);
222
223#endif /* CONFIG_CMA */
224
225int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
226 bool want_memblock)
227{
228 unsigned long start_pfn = PFN_DOWN(start);
229 unsigned long size_pages = PFN_DOWN(size);
230 int rc;
231
232 rc = vmem_add_mapping(start, size);
233 if (rc)
234 return rc;
235
236 rc = __add_pages(nid, start_pfn, size_pages, altmap, want_memblock);
237 if (rc)
238 vmem_remove_mapping(start, size);
239 return rc;
240}
241
242#ifdef CONFIG_MEMORY_HOTREMOVE
243int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
244{
245 /*
246 * There is no hardware or firmware interface which could trigger a
247 * hot memory remove on s390. So there is nothing that needs to be
248 * implemented.
249 */
250 return -EBUSY;
251}
252#endif
253#endif /* CONFIG_MEMORY_HOTPLUG */