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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");
55static pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir");
56
57unsigned long 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 unsigned long pgd_type, asce_bits;
97 psw_t psw;
98
99 s390_invalid_asce = (unsigned long)invalid_pg_dir;
100 s390_invalid_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
101 crst_table_init((unsigned long *)invalid_pg_dir, _REGION3_ENTRY_EMPTY);
102 init_mm.pgd = swapper_pg_dir;
103 if (VMALLOC_END > _REGION2_SIZE) {
104 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
105 pgd_type = _REGION2_ENTRY_EMPTY;
106 } else {
107 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
108 pgd_type = _REGION3_ENTRY_EMPTY;
109 }
110 init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
111 S390_lowcore.kernel_asce = init_mm.context.asce;
112 S390_lowcore.user_asce = s390_invalid_asce;
113 crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
114 vmem_map_init();
115 kasan_copy_shadow_mapping();
116
117 /* enable virtual mapping in kernel mode */
118 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
119 __ctl_load(S390_lowcore.user_asce, 7, 7);
120 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
121 psw.mask = __extract_psw();
122 psw_bits(psw).dat = 1;
123 psw_bits(psw).as = PSW_BITS_AS_HOME;
124 __load_psw_mask(psw.mask);
125 kasan_free_early_identity();
126
127 sparse_init();
128 zone_dma_bits = 31;
129 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
130 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
131 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
132 free_area_init(max_zone_pfns);
133}
134
135void mark_rodata_ro(void)
136{
137 unsigned long size = __end_ro_after_init - __start_ro_after_init;
138
139 set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT);
140 pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
141 debug_checkwx();
142}
143
144int set_memory_encrypted(unsigned long vaddr, int numpages)
145{
146 int i;
147
148 /* make specified pages unshared, (swiotlb, dma_free) */
149 for (i = 0; i < numpages; ++i) {
150 uv_remove_shared(virt_to_phys((void *)vaddr));
151 vaddr += PAGE_SIZE;
152 }
153 return 0;
154}
155
156int set_memory_decrypted(unsigned long vaddr, int numpages)
157{
158 int i;
159 /* make specified pages shared (swiotlb, dma_alloca) */
160 for (i = 0; i < numpages; ++i) {
161 uv_set_shared(virt_to_phys((void *)vaddr));
162 vaddr += PAGE_SIZE;
163 }
164 return 0;
165}
166
167/* are we a protected virtualization guest? */
168bool force_dma_unencrypted(struct device *dev)
169{
170 return is_prot_virt_guest();
171}
172
173/* protected virtualization */
174static void pv_init(void)
175{
176 if (!is_prot_virt_guest())
177 return;
178
179 virtio_set_mem_acc_cb(virtio_require_restricted_mem_acc);
180
181 /* make sure bounce buffers are shared */
182 swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE);
183 swiotlb_update_mem_attributes();
184}
185
186void __init mem_init(void)
187{
188 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
189 cpumask_set_cpu(0, mm_cpumask(&init_mm));
190
191 set_max_mapnr(max_low_pfn);
192 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
193
194 pv_init();
195 kfence_split_mapping();
196 /* Setup guest page hinting */
197 cmma_init();
198
199 /* this will put all low memory onto the freelists */
200 memblock_free_all();
201 setup_zero_pages(); /* Setup zeroed pages. */
202
203 cmma_init_nodat();
204}
205
206void free_initmem(void)
207{
208 __set_memory((unsigned long)_sinittext,
209 (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
210 SET_MEMORY_RW | SET_MEMORY_NX);
211 free_initmem_default(POISON_FREE_INITMEM);
212}
213
214unsigned long memory_block_size_bytes(void)
215{
216 /*
217 * Make sure the memory block size is always greater
218 * or equal than the memory increment size.
219 */
220 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
221}
222
223unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
224EXPORT_SYMBOL(__per_cpu_offset);
225
226static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
227{
228 return LOCAL_DISTANCE;
229}
230
231static int __init pcpu_cpu_to_node(int cpu)
232{
233 return 0;
234}
235
236void __init setup_per_cpu_areas(void)
237{
238 unsigned long delta;
239 unsigned int cpu;
240 int rc;
241
242 /*
243 * Always reserve area for module percpu variables. That's
244 * what the legacy allocator did.
245 */
246 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
247 PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
248 pcpu_cpu_distance,
249 pcpu_cpu_to_node);
250 if (rc < 0)
251 panic("Failed to initialize percpu areas.");
252
253 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
254 for_each_possible_cpu(cpu)
255 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
256}
257
258#ifdef CONFIG_MEMORY_HOTPLUG
259
260#ifdef CONFIG_CMA
261
262/* Prevent memory blocks which contain cma regions from going offline */
263
264struct s390_cma_mem_data {
265 unsigned long start;
266 unsigned long end;
267};
268
269static int s390_cma_check_range(struct cma *cma, void *data)
270{
271 struct s390_cma_mem_data *mem_data;
272 unsigned long start, end;
273
274 mem_data = data;
275 start = cma_get_base(cma);
276 end = start + cma_get_size(cma);
277 if (end < mem_data->start)
278 return 0;
279 if (start >= mem_data->end)
280 return 0;
281 return -EBUSY;
282}
283
284static int s390_cma_mem_notifier(struct notifier_block *nb,
285 unsigned long action, void *data)
286{
287 struct s390_cma_mem_data mem_data;
288 struct memory_notify *arg;
289 int rc = 0;
290
291 arg = data;
292 mem_data.start = arg->start_pfn << PAGE_SHIFT;
293 mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
294 if (action == MEM_GOING_OFFLINE)
295 rc = cma_for_each_area(s390_cma_check_range, &mem_data);
296 return notifier_from_errno(rc);
297}
298
299static struct notifier_block s390_cma_mem_nb = {
300 .notifier_call = s390_cma_mem_notifier,
301};
302
303static int __init s390_cma_mem_init(void)
304{
305 return register_memory_notifier(&s390_cma_mem_nb);
306}
307device_initcall(s390_cma_mem_init);
308
309#endif /* CONFIG_CMA */
310
311int arch_add_memory(int nid, u64 start, u64 size,
312 struct mhp_params *params)
313{
314 unsigned long start_pfn = PFN_DOWN(start);
315 unsigned long size_pages = PFN_DOWN(size);
316 int rc;
317
318 if (WARN_ON_ONCE(params->altmap))
319 return -EINVAL;
320
321 if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
322 return -EINVAL;
323
324 VM_BUG_ON(!mhp_range_allowed(start, size, true));
325 rc = vmem_add_mapping(start, size);
326 if (rc)
327 return rc;
328
329 rc = __add_pages(nid, start_pfn, size_pages, params);
330 if (rc)
331 vmem_remove_mapping(start, size);
332 return rc;
333}
334
335void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
336{
337 unsigned long start_pfn = start >> PAGE_SHIFT;
338 unsigned long nr_pages = size >> PAGE_SHIFT;
339
340 __remove_pages(start_pfn, nr_pages, altmap);
341 vmem_remove_mapping(start, size);
342}
343#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 <asm/processor.h>
31#include <asm/uaccess.h>
32#include <asm/pgtable.h>
33#include <asm/pgalloc.h>
34#include <asm/dma.h>
35#include <asm/lowcore.h>
36#include <asm/tlb.h>
37#include <asm/tlbflush.h>
38#include <asm/sections.h>
39#include <asm/ctl_reg.h>
40#include <asm/sclp.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 void __init setup_zero_pages(void)
48{
49 struct cpuid cpu_id;
50 unsigned int order;
51 struct page *page;
52 int i;
53
54 get_cpu_id(&cpu_id);
55 switch (cpu_id.machine) {
56 case 0x9672: /* g5 */
57 case 0x2064: /* z900 */
58 case 0x2066: /* z900 */
59 case 0x2084: /* z990 */
60 case 0x2086: /* z990 */
61 case 0x2094: /* z9-109 */
62 case 0x2096: /* z9-109 */
63 order = 0;
64 break;
65 case 0x2097: /* z10 */
66 case 0x2098: /* z10 */
67 case 0x2817: /* z196 */
68 case 0x2818: /* z196 */
69 order = 2;
70 break;
71 case 0x2827: /* zEC12 */
72 case 0x2828: /* zEC12 */
73 default:
74 order = 5;
75 break;
76 }
77 /* Limit number of empty zero pages for small memory sizes */
78 if (order > 2 && totalram_pages <= 16384)
79 order = 2;
80
81 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
82 if (!empty_zero_page)
83 panic("Out of memory in setup_zero_pages");
84
85 page = virt_to_page((void *) empty_zero_page);
86 split_page(page, order);
87 for (i = 1 << order; i > 0; i--) {
88 mark_page_reserved(page);
89 page++;
90 }
91
92 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
93}
94
95/*
96 * paging_init() sets up the page tables
97 */
98void __init paging_init(void)
99{
100 unsigned long max_zone_pfns[MAX_NR_ZONES];
101 unsigned long pgd_type, asce_bits;
102
103 init_mm.pgd = swapper_pg_dir;
104#ifdef CONFIG_64BIT
105 if (VMALLOC_END > (1UL << 42)) {
106 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
107 pgd_type = _REGION2_ENTRY_EMPTY;
108 } else {
109 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
110 pgd_type = _REGION3_ENTRY_EMPTY;
111 }
112#else
113 asce_bits = _ASCE_TABLE_LENGTH;
114 pgd_type = _SEGMENT_ENTRY_EMPTY;
115#endif
116 S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
117 clear_table((unsigned long *) init_mm.pgd, pgd_type,
118 sizeof(unsigned long)*2048);
119 vmem_map_init();
120
121 /* enable virtual mapping in kernel mode */
122 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
123 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
124 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
125 arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
126
127 sparse_memory_present_with_active_regions(MAX_NUMNODES);
128 sparse_init();
129 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
130 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
131 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
132 free_area_init_nodes(max_zone_pfns);
133}
134
135void __init mem_init(void)
136{
137 if (MACHINE_HAS_TLB_LC)
138 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
139 cpumask_set_cpu(0, mm_cpumask(&init_mm));
140 atomic_set(&init_mm.context.attach_count, 1);
141
142 max_mapnr = max_low_pfn;
143 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
144
145 /* Setup guest page hinting */
146 cmma_init();
147
148 /* this will put all low memory onto the freelists */
149 free_all_bootmem();
150 setup_zero_pages(); /* Setup zeroed pages. */
151
152 mem_init_print_info(NULL);
153 printk("Write protected kernel read-only data: %#lx - %#lx\n",
154 (unsigned long)&_stext,
155 PFN_ALIGN((unsigned long)&_eshared) - 1);
156}
157
158void free_initmem(void)
159{
160 free_initmem_default(POISON_FREE_INITMEM);
161}
162
163#ifdef CONFIG_BLK_DEV_INITRD
164void __init free_initrd_mem(unsigned long start, unsigned long end)
165{
166 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
167 "initrd");
168}
169#endif
170
171#ifdef CONFIG_MEMORY_HOTPLUG
172int arch_add_memory(int nid, u64 start, u64 size)
173{
174 unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
175 unsigned long start_pfn = PFN_DOWN(start);
176 unsigned long size_pages = PFN_DOWN(size);
177 struct zone *zone;
178 int rc;
179
180 rc = vmem_add_mapping(start, size);
181 if (rc)
182 return rc;
183 for_each_zone(zone) {
184 if (zone_idx(zone) != ZONE_MOVABLE) {
185 /* Add range within existing zone limits */
186 zone_start_pfn = zone->zone_start_pfn;
187 zone_end_pfn = zone->zone_start_pfn +
188 zone->spanned_pages;
189 } else {
190 /* Add remaining range to ZONE_MOVABLE */
191 zone_start_pfn = start_pfn;
192 zone_end_pfn = start_pfn + size_pages;
193 }
194 if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn)
195 continue;
196 nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
197 zone_end_pfn - start_pfn : size_pages;
198 rc = __add_pages(nid, zone, start_pfn, nr_pages);
199 if (rc)
200 break;
201 start_pfn += nr_pages;
202 size_pages -= nr_pages;
203 if (!size_pages)
204 break;
205 }
206 if (rc)
207 vmem_remove_mapping(start, size);
208 return rc;
209}
210
211unsigned long memory_block_size_bytes(void)
212{
213 /*
214 * Make sure the memory block size is always greater
215 * or equal than the memory increment size.
216 */
217 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm());
218}
219
220#ifdef CONFIG_MEMORY_HOTREMOVE
221int arch_remove_memory(u64 start, u64 size)
222{
223 /*
224 * There is no hardware or firmware interface which could trigger a
225 * hot memory remove on s390. So there is nothing that needs to be
226 * implemented.
227 */
228 return -EBUSY;
229}
230#endif
231#endif /* CONFIG_MEMORY_HOTPLUG */