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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
65 order = 7;
66
67
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
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
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
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
151 for (i = 0; i < numpages; ++i) {
152 uv_set_shared(addr);
153 addr += PAGE_SIZE;
154 }
155 return 0;
156}
157
158
159bool sev_active(void)
160{
161 return is_prot_virt_guest();
162}
163
164bool force_dma_unencrypted(struct device *dev)
165{
166 return sev_active();
167}
168
169
170static void pv_init(void)
171{
172 if (!is_prot_virt_guest())
173 return;
174
175
176 swiotlb_init(1);
177 swiotlb_update_mem_attributes();
178 swiotlb_force = SWIOTLB_FORCE;
179}
180
181void __init mem_init(void)
182{
183 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
184 cpumask_set_cpu(0, mm_cpumask(&init_mm));
185
186 set_max_mapnr(max_low_pfn);
187 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
188
189 pv_init();
190
191
192 cmma_init();
193
194
195 memblock_free_all();
196 setup_zero_pages();
197
198 cmma_init_nodat();
199
200 mem_init_print_info(NULL);
201}
202
203void free_initmem(void)
204{
205 initmem_freed = true;
206 __set_memory((unsigned long)_sinittext,
207 (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
208 SET_MEMORY_RW | SET_MEMORY_NX);
209 free_initmem_default(POISON_FREE_INITMEM);
210}
211
212unsigned long memory_block_size_bytes(void)
213{
214
215
216
217
218 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
219}
220
221#ifdef CONFIG_MEMORY_HOTPLUG
222
223#ifdef CONFIG_CMA
224
225
226
227struct s390_cma_mem_data {
228 unsigned long start;
229 unsigned long end;
230};
231
232static int s390_cma_check_range(struct cma *cma, void *data)
233{
234 struct s390_cma_mem_data *mem_data;
235 unsigned long start, end;
236
237 mem_data = data;
238 start = cma_get_base(cma);
239 end = start + cma_get_size(cma);
240 if (end < mem_data->start)
241 return 0;
242 if (start >= mem_data->end)
243 return 0;
244 return -EBUSY;
245}
246
247static int s390_cma_mem_notifier(struct notifier_block *nb,
248 unsigned long action, void *data)
249{
250 struct s390_cma_mem_data mem_data;
251 struct memory_notify *arg;
252 int rc = 0;
253
254 arg = data;
255 mem_data.start = arg->start_pfn << PAGE_SHIFT;
256 mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
257 if (action == MEM_GOING_OFFLINE)
258 rc = cma_for_each_area(s390_cma_check_range, &mem_data);
259 return notifier_from_errno(rc);
260}
261
262static struct notifier_block s390_cma_mem_nb = {
263 .notifier_call = s390_cma_mem_notifier,
264};
265
266static int __init s390_cma_mem_init(void)
267{
268 return register_memory_notifier(&s390_cma_mem_nb);
269}
270device_initcall(s390_cma_mem_init);
271
272#endif
273
274int arch_add_memory(int nid, u64 start, u64 size,
275 struct mhp_restrictions *restrictions)
276{
277 unsigned long start_pfn = PFN_DOWN(start);
278 unsigned long size_pages = PFN_DOWN(size);
279 int rc;
280
281 if (WARN_ON_ONCE(restrictions->altmap))
282 return -EINVAL;
283
284 rc = vmem_add_mapping(start, size);
285 if (rc)
286 return rc;
287
288 rc = __add_pages(nid, start_pfn, size_pages, restrictions);
289 if (rc)
290 vmem_remove_mapping(start, size);
291 return rc;
292}
293
294void arch_remove_memory(int nid, u64 start, u64 size,
295 struct vmem_altmap *altmap)
296{
297 unsigned long start_pfn = start >> PAGE_SHIFT;
298 unsigned long nr_pages = size >> PAGE_SHIFT;
299 struct zone *zone;
300
301 zone = page_zone(pfn_to_page(start_pfn));
302 __remove_pages(zone, start_pfn, nr_pages, altmap);
303 vmem_remove_mapping(start, size);
304}
305#endif
306
