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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/*
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/gfp.h>
30#include <asm/processor.h>
31#include <asm/system.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
41pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
42
43unsigned long empty_zero_page, zero_page_mask;
44EXPORT_SYMBOL(empty_zero_page);
45
46static unsigned long setup_zero_pages(void)
47{
48 struct cpuid cpu_id;
49 unsigned int order;
50 unsigned long size;
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 default:
68 order = 2;
69 break;
70 }
71
72 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
73 if (!empty_zero_page)
74 panic("Out of memory in setup_zero_pages");
75
76 page = virt_to_page((void *) empty_zero_page);
77 split_page(page, order);
78 for (i = 1 << order; i > 0; i--) {
79 SetPageReserved(page);
80 page++;
81 }
82
83 size = PAGE_SIZE << order;
84 zero_page_mask = (size - 1) & PAGE_MASK;
85
86 return 1UL << order;
87}
88
89/*
90 * paging_init() sets up the page tables
91 */
92void __init paging_init(void)
93{
94 unsigned long max_zone_pfns[MAX_NR_ZONES];
95 unsigned long pgd_type;
96
97 init_mm.pgd = swapper_pg_dir;
98 S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
99#ifdef CONFIG_64BIT
100 /* A three level page table (4TB) is enough for the kernel space. */
101 S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
102 pgd_type = _REGION3_ENTRY_EMPTY;
103#else
104 S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH;
105 pgd_type = _SEGMENT_ENTRY_EMPTY;
106#endif
107 clear_table((unsigned long *) init_mm.pgd, pgd_type,
108 sizeof(unsigned long)*2048);
109 vmem_map_init();
110
111 /* enable virtual mapping in kernel mode */
112 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
113 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
114 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
115 arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
116
117 atomic_set(&init_mm.context.attach_count, 1);
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 fault_init();
126}
127
128void __init mem_init(void)
129{
130 unsigned long codesize, reservedpages, datasize, initsize;
131
132 max_mapnr = num_physpages = 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 totalram_pages += free_all_bootmem();
140 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
141
142 reservedpages = 0;
143
144 codesize = (unsigned long) &_etext - (unsigned long) &_text;
145 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
146 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
147 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
148 nr_free_pages() << (PAGE_SHIFT-10),
149 max_mapnr << (PAGE_SHIFT-10),
150 codesize >> 10,
151 reservedpages << (PAGE_SHIFT-10),
152 datasize >>10,
153 initsize >> 10);
154 printk("Write protected kernel read-only data: %#lx - %#lx\n",
155 (unsigned long)&_stext,
156 PFN_ALIGN((unsigned long)&_eshared) - 1);
157}
158
159#ifdef CONFIG_DEBUG_PAGEALLOC
160void kernel_map_pages(struct page *page, int numpages, int enable)
161{
162 pgd_t *pgd;
163 pud_t *pud;
164 pmd_t *pmd;
165 pte_t *pte;
166 unsigned long address;
167 int i;
168
169 for (i = 0; i < numpages; i++) {
170 address = page_to_phys(page + i);
171 pgd = pgd_offset_k(address);
172 pud = pud_offset(pgd, address);
173 pmd = pmd_offset(pud, address);
174 pte = pte_offset_kernel(pmd, address);
175 if (!enable) {
176 __ptep_ipte(address, pte);
177 pte_val(*pte) = _PAGE_TYPE_EMPTY;
178 continue;
179 }
180 *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
181 /* Flush cpu write queue. */
182 mb();
183 }
184}
185#endif
186
187void free_init_pages(char *what, unsigned long begin, unsigned long end)
188{
189 unsigned long addr = begin;
190
191 if (begin >= end)
192 return;
193 for (; addr < end; addr += PAGE_SIZE) {
194 ClearPageReserved(virt_to_page(addr));
195 init_page_count(virt_to_page(addr));
196 memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
197 PAGE_SIZE);
198 free_page(addr);
199 totalram_pages++;
200 }
201 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
202}
203
204void free_initmem(void)
205{
206 free_init_pages("unused kernel memory",
207 (unsigned long)&__init_begin,
208 (unsigned long)&__init_end);
209}
210
211#ifdef CONFIG_BLK_DEV_INITRD
212void free_initrd_mem(unsigned long start, unsigned long end)
213{
214 free_init_pages("initrd memory", start, end);
215}
216#endif
217
218#ifdef CONFIG_MEMORY_HOTPLUG
219int arch_add_memory(int nid, u64 start, u64 size)
220{
221 struct pglist_data *pgdat;
222 struct zone *zone;
223 int rc;
224
225 pgdat = NODE_DATA(nid);
226 zone = pgdat->node_zones + ZONE_MOVABLE;
227 rc = vmem_add_mapping(start, size);
228 if (rc)
229 return rc;
230 rc = __add_pages(nid, zone, PFN_DOWN(start), PFN_DOWN(size));
231 if (rc)
232 vmem_remove_mapping(start, size);
233 return rc;
234}
235#endif /* CONFIG_MEMORY_HOTPLUG */