1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * S390 version
4a53c8fabSHeiko Carstens * Copyright IBM Corp. 1999
51da177e4SLinus Torvalds * Author(s): Hartmut Penner (hp@de.ibm.com)
61da177e4SLinus Torvalds *
71da177e4SLinus Torvalds * Derived from "arch/i386/mm/init.c"
81da177e4SLinus Torvalds * Copyright (C) 1995 Linus Torvalds
91da177e4SLinus Torvalds */
101da177e4SLinus Torvalds
111da177e4SLinus Torvalds #include <linux/signal.h>
121da177e4SLinus Torvalds #include <linux/sched.h>
131da177e4SLinus Torvalds #include <linux/kernel.h>
141da177e4SLinus Torvalds #include <linux/errno.h>
151da177e4SLinus Torvalds #include <linux/string.h>
161da177e4SLinus Torvalds #include <linux/types.h>
171da177e4SLinus Torvalds #include <linux/ptrace.h>
181da177e4SLinus Torvalds #include <linux/mman.h>
191da177e4SLinus Torvalds #include <linux/mm.h>
201da177e4SLinus Torvalds #include <linux/swap.h>
2164e1f0c5SHalil Pasic #include <linux/swiotlb.h>
221da177e4SLinus Torvalds #include <linux/smp.h>
231da177e4SLinus Torvalds #include <linux/init.h>
241da177e4SLinus Torvalds #include <linux/pagemap.h>
2557c8a661SMike Rapoport #include <linux/memblock.h>
26e5d709bbSHeiko Carstens #include <linux/memory.h>
27d882b172SHeiko Carstens #include <linux/pfn.h>
28028d9b3cSHeiko Carstens #include <linux/poison.h>
292b67fc46SHeiko Carstens #include <linux/initrd.h>
303a4c5d59SHeiko Carstens #include <linux/export.h>
3134ad7cdcSHeiko Carstens #include <linux/cma.h>
325a0e3ad6STejun Heo #include <linux/gfp.h>
339087c375STom Lendacky #include <linux/dma-direct.h>
34254b2fd0SHeiko Carstens #include <linux/percpu.h>
351da177e4SLinus Torvalds #include <asm/processor.h>
367c0f6ba6SLinus Torvalds #include <linux/uaccess.h>
371da177e4SLinus Torvalds #include <asm/pgalloc.h>
38e41ba111SSven Schnelle #include <asm/kfence.h>
3908c8e685SHeiko Carstens #include <asm/ptdump.h>
401da177e4SLinus Torvalds #include <asm/dma.h>
414df29d2bSAlexander Gordeev #include <asm/abs_lowcore.h>
421da177e4SLinus Torvalds #include <asm/tlb.h>
431da177e4SLinus Torvalds #include <asm/tlbflush.h>
44d882b172SHeiko Carstens #include <asm/sections.h>
45a0616cdeSDavid Howells #include <asm/ctl_reg.h>
46e5d709bbSHeiko Carstens #include <asm/sclp.h>
47e6c7c630SLaura Abbott #include <asm/set_memory.h>
4842db5ed8SVasily Gorbik #include <asm/kasan.h>
4964e1f0c5SHalil Pasic #include <asm/dma-mapping.h>
5064e1f0c5SHalil Pasic #include <asm/uv.h>
51a603002eSJuergen Gross #include <linux/virtio_anchor.h>
524ce1cf7bSPierre Morel #include <linux/virtio_config.h>
531da177e4SLinus Torvalds
5433def849SJoe Perches pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir");
55bb1520d5SAlexander Gordeev pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir");
560290c9e3SHeiko Carstens
57bb1520d5SAlexander Gordeev unsigned long __bootdata_preserved(s390_invalid_asce);
581485c5c8SHeiko Carstens
59238ec4efSMartin Schwidefsky unsigned long empty_zero_page, zero_page_mask;
601485c5c8SHeiko Carstens EXPORT_SYMBOL(empty_zero_page);
610b70068eSArd Biesheuvel EXPORT_SYMBOL(zero_page_mask);
621da177e4SLinus Torvalds
setup_zero_pages(void)630999f119SJiang Liu static void __init setup_zero_pages(void)
64238ec4efSMartin Schwidefsky {
65238ec4efSMartin Schwidefsky unsigned int order;
66238ec4efSMartin Schwidefsky struct page *page;
67238ec4efSMartin Schwidefsky int i;
68238ec4efSMartin Schwidefsky
69c7e8b2c2SMartin Schwidefsky /* Latest machines require a mapping granularity of 512KB */
701f6b83e5SMartin Schwidefsky order = 7;
71c7e8b2c2SMartin Schwidefsky
727919e91bSMartin Schwidefsky /* Limit number of empty zero pages for small memory sizes */
73ca79b0c2SArun KS while (order > 2 && (totalram_pages() >> 10) < (1UL << order))
741f6b83e5SMartin Schwidefsky order--;
75238ec4efSMartin Schwidefsky
76238ec4efSMartin Schwidefsky empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
77238ec4efSMartin Schwidefsky if (!empty_zero_page)
78238ec4efSMartin Schwidefsky panic("Out of memory in setup_zero_pages");
79238ec4efSMartin Schwidefsky
80238ec4efSMartin Schwidefsky page = virt_to_page((void *) empty_zero_page);
81238ec4efSMartin Schwidefsky split_page(page, order);
82238ec4efSMartin Schwidefsky for (i = 1 << order; i > 0; i--) {
830999f119SJiang Liu mark_page_reserved(page);
84238ec4efSMartin Schwidefsky page++;
85238ec4efSMartin Schwidefsky }
86238ec4efSMartin Schwidefsky
870999f119SJiang Liu zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
88238ec4efSMartin Schwidefsky }
89238ec4efSMartin Schwidefsky
901da177e4SLinus Torvalds /*
911da177e4SLinus Torvalds * paging_init() sets up the page tables
921da177e4SLinus Torvalds */
paging_init(void)931da177e4SLinus Torvalds void __init paging_init(void)
941da177e4SLinus Torvalds {
9539b742f9SHeiko Carstens unsigned long max_zone_pfns[MAX_NR_ZONES];
961da177e4SLinus Torvalds
97f4eb07c1SHeiko Carstens vmem_map_init();
9817f34580SHeiko Carstens sparse_init();
998b5369eaSNicolas Saenz Julienne zone_dma_bits = 31;
10039b742f9SHeiko Carstens memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
101*08d90f46SAlexander Gordeev max_zone_pfns[ZONE_DMA] = virt_to_pfn(MAX_DMA_ADDRESS);
10239b742f9SHeiko Carstens max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
1039691a071SMike Rapoport free_area_init(max_zone_pfns);
1041da177e4SLinus Torvalds }
1051da177e4SLinus Torvalds
mark_rodata_ro(void)10691d37211SHeiko Carstens void mark_rodata_ro(void)
10791d37211SHeiko Carstens {
108d07a980cSHeiko Carstens unsigned long size = __end_ro_after_init - __start_ro_after_init;
109d07a980cSHeiko Carstens
110a7eb2880SHeiko Carstens __set_memory_ro(__start_ro_after_init, __end_ro_after_init);
111d07a980cSHeiko Carstens pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
11208c8e685SHeiko Carstens debug_checkwx();
11391d37211SHeiko Carstens }
11491d37211SHeiko Carstens
set_memory_encrypted(unsigned long vaddr,int numpages)11558635d66SNico Boehr int set_memory_encrypted(unsigned long vaddr, int numpages)
11664e1f0c5SHalil Pasic {
11764e1f0c5SHalil Pasic int i;
11864e1f0c5SHalil Pasic
11964e1f0c5SHalil Pasic /* make specified pages unshared, (swiotlb, dma_free) */
12064e1f0c5SHalil Pasic for (i = 0; i < numpages; ++i) {
12158635d66SNico Boehr uv_remove_shared(virt_to_phys((void *)vaddr));
12258635d66SNico Boehr vaddr += PAGE_SIZE;
12364e1f0c5SHalil Pasic }
12464e1f0c5SHalil Pasic return 0;
12564e1f0c5SHalil Pasic }
12664e1f0c5SHalil Pasic
set_memory_decrypted(unsigned long vaddr,int numpages)12758635d66SNico Boehr int set_memory_decrypted(unsigned long vaddr, int numpages)
12864e1f0c5SHalil Pasic {
12964e1f0c5SHalil Pasic int i;
13064e1f0c5SHalil Pasic /* make specified pages shared (swiotlb, dma_alloca) */
13164e1f0c5SHalil Pasic for (i = 0; i < numpages; ++i) {
13258635d66SNico Boehr uv_set_shared(virt_to_phys((void *)vaddr));
13358635d66SNico Boehr vaddr += PAGE_SIZE;
13464e1f0c5SHalil Pasic }
13564e1f0c5SHalil Pasic return 0;
13664e1f0c5SHalil Pasic }
13764e1f0c5SHalil Pasic
13864e1f0c5SHalil Pasic /* are we a protected virtualization guest? */
force_dma_unencrypted(struct device * dev)1399087c375STom Lendacky bool force_dma_unencrypted(struct device *dev)
1409087c375STom Lendacky {
1415cbdaeefSThiago Jung Bauermann return is_prot_virt_guest();
1429087c375STom Lendacky }
1439087c375STom Lendacky
14464e1f0c5SHalil Pasic /* protected virtualization */
pv_init(void)14564e1f0c5SHalil Pasic static void pv_init(void)
14664e1f0c5SHalil Pasic {
14764e1f0c5SHalil Pasic if (!is_prot_virt_guest())
14864e1f0c5SHalil Pasic return;
14964e1f0c5SHalil Pasic
150a603002eSJuergen Gross virtio_set_mem_acc_cb(virtio_require_restricted_mem_acc);
1513f9dfbebSJuergen Gross
15264e1f0c5SHalil Pasic /* make sure bounce buffers are shared */
153c6af2aa9SChristoph Hellwig swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE);
15464e1f0c5SHalil Pasic swiotlb_update_mem_attributes();
15564e1f0c5SHalil Pasic }
15664e1f0c5SHalil Pasic
mem_init(void)1571da177e4SLinus Torvalds void __init mem_init(void)
1581da177e4SLinus Torvalds {
1591b948d6cSMartin Schwidefsky cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
1601b948d6cSMartin Schwidefsky cpumask_set_cpu(0, mm_cpumask(&init_mm));
1611b948d6cSMartin Schwidefsky
1623a368f74SPhilipp Hachtmann set_max_mapnr(max_low_pfn);
1631da177e4SLinus Torvalds high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
1641da177e4SLinus Torvalds
16564e1f0c5SHalil Pasic pv_init();
166e41ba111SSven Schnelle kfence_split_mapping();
16745e576b1SMartin Schwidefsky /* Setup guest page hinting */
16845e576b1SMartin Schwidefsky cmma_init();
16945e576b1SMartin Schwidefsky
1701da177e4SLinus Torvalds /* this will put all low memory onto the freelists */
171c6ffc5caSMike Rapoport memblock_free_all();
1720999f119SJiang Liu setup_zero_pages(); /* Setup zeroed pages. */
1731da177e4SLinus Torvalds
174c9b5ad54SMartin Schwidefsky cmma_init_nodat();
1751da177e4SLinus Torvalds }
1761da177e4SLinus Torvalds
free_initmem(void)177d96221abSHeiko Carstens void free_initmem(void)
178d96221abSHeiko Carstens {
179f9b2d96cSHeiko Carstens set_memory_rwnx((unsigned long)_sinittext,
180f9b2d96cSHeiko Carstens (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT);
181dbe67df4SJiang Liu free_initmem_default(POISON_FREE_INITMEM);
1821da177e4SLinus Torvalds }
1831da177e4SLinus Torvalds
memory_block_size_bytes(void)184604ddad0SHeiko Carstens unsigned long memory_block_size_bytes(void)
185604ddad0SHeiko Carstens {
186604ddad0SHeiko Carstens /*
187604ddad0SHeiko Carstens * Make sure the memory block size is always greater
188604ddad0SHeiko Carstens * or equal than the memory increment size.
189604ddad0SHeiko Carstens */
190604ddad0SHeiko Carstens return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
191604ddad0SHeiko Carstens }
192604ddad0SHeiko Carstens
193254b2fd0SHeiko Carstens unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
194254b2fd0SHeiko Carstens EXPORT_SYMBOL(__per_cpu_offset);
195254b2fd0SHeiko Carstens
pcpu_cpu_distance(unsigned int from,unsigned int to)196254b2fd0SHeiko Carstens static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
197254b2fd0SHeiko Carstens {
198254b2fd0SHeiko Carstens return LOCAL_DISTANCE;
199254b2fd0SHeiko Carstens }
200254b2fd0SHeiko Carstens
pcpu_cpu_to_node(int cpu)201254b2fd0SHeiko Carstens static int __init pcpu_cpu_to_node(int cpu)
202254b2fd0SHeiko Carstens {
203254b2fd0SHeiko Carstens return 0;
204254b2fd0SHeiko Carstens }
205254b2fd0SHeiko Carstens
setup_per_cpu_areas(void)206254b2fd0SHeiko Carstens void __init setup_per_cpu_areas(void)
207254b2fd0SHeiko Carstens {
208254b2fd0SHeiko Carstens unsigned long delta;
209254b2fd0SHeiko Carstens unsigned int cpu;
210254b2fd0SHeiko Carstens int rc;
211254b2fd0SHeiko Carstens
212254b2fd0SHeiko Carstens /*
213254b2fd0SHeiko Carstens * Always reserve area for module percpu variables. That's
214254b2fd0SHeiko Carstens * what the legacy allocator did.
215254b2fd0SHeiko Carstens */
216254b2fd0SHeiko Carstens rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
217254b2fd0SHeiko Carstens PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
218254b2fd0SHeiko Carstens pcpu_cpu_distance,
219254b2fd0SHeiko Carstens pcpu_cpu_to_node);
220254b2fd0SHeiko Carstens if (rc < 0)
221254b2fd0SHeiko Carstens panic("Failed to initialize percpu areas.");
222254b2fd0SHeiko Carstens
223254b2fd0SHeiko Carstens delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
224254b2fd0SHeiko Carstens for_each_possible_cpu(cpu)
225254b2fd0SHeiko Carstens __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
226254b2fd0SHeiko Carstens }
227254b2fd0SHeiko Carstens
228421c175cSHeiko Carstens #ifdef CONFIG_MEMORY_HOTPLUG
22934ad7cdcSHeiko Carstens
23034ad7cdcSHeiko Carstens #ifdef CONFIG_CMA
23134ad7cdcSHeiko Carstens
23234ad7cdcSHeiko Carstens /* Prevent memory blocks which contain cma regions from going offline */
23334ad7cdcSHeiko Carstens
23434ad7cdcSHeiko Carstens struct s390_cma_mem_data {
23534ad7cdcSHeiko Carstens unsigned long start;
23634ad7cdcSHeiko Carstens unsigned long end;
23734ad7cdcSHeiko Carstens };
23834ad7cdcSHeiko Carstens
s390_cma_check_range(struct cma * cma,void * data)23934ad7cdcSHeiko Carstens static int s390_cma_check_range(struct cma *cma, void *data)
24034ad7cdcSHeiko Carstens {
24134ad7cdcSHeiko Carstens struct s390_cma_mem_data *mem_data;
24234ad7cdcSHeiko Carstens unsigned long start, end;
24334ad7cdcSHeiko Carstens
24434ad7cdcSHeiko Carstens mem_data = data;
24534ad7cdcSHeiko Carstens start = cma_get_base(cma);
24634ad7cdcSHeiko Carstens end = start + cma_get_size(cma);
24734ad7cdcSHeiko Carstens if (end < mem_data->start)
24834ad7cdcSHeiko Carstens return 0;
24934ad7cdcSHeiko Carstens if (start >= mem_data->end)
25034ad7cdcSHeiko Carstens return 0;
25134ad7cdcSHeiko Carstens return -EBUSY;
25234ad7cdcSHeiko Carstens }
25334ad7cdcSHeiko Carstens
s390_cma_mem_notifier(struct notifier_block * nb,unsigned long action,void * data)25434ad7cdcSHeiko Carstens static int s390_cma_mem_notifier(struct notifier_block *nb,
25534ad7cdcSHeiko Carstens unsigned long action, void *data)
25634ad7cdcSHeiko Carstens {
25734ad7cdcSHeiko Carstens struct s390_cma_mem_data mem_data;
25834ad7cdcSHeiko Carstens struct memory_notify *arg;
25934ad7cdcSHeiko Carstens int rc = 0;
26034ad7cdcSHeiko Carstens
26134ad7cdcSHeiko Carstens arg = data;
26234ad7cdcSHeiko Carstens mem_data.start = arg->start_pfn << PAGE_SHIFT;
26334ad7cdcSHeiko Carstens mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
26434ad7cdcSHeiko Carstens if (action == MEM_GOING_OFFLINE)
26534ad7cdcSHeiko Carstens rc = cma_for_each_area(s390_cma_check_range, &mem_data);
26634ad7cdcSHeiko Carstens return notifier_from_errno(rc);
26734ad7cdcSHeiko Carstens }
26834ad7cdcSHeiko Carstens
26934ad7cdcSHeiko Carstens static struct notifier_block s390_cma_mem_nb = {
27034ad7cdcSHeiko Carstens .notifier_call = s390_cma_mem_notifier,
27134ad7cdcSHeiko Carstens };
27234ad7cdcSHeiko Carstens
s390_cma_mem_init(void)27334ad7cdcSHeiko Carstens static int __init s390_cma_mem_init(void)
27434ad7cdcSHeiko Carstens {
27534ad7cdcSHeiko Carstens return register_memory_notifier(&s390_cma_mem_nb);
27634ad7cdcSHeiko Carstens }
27734ad7cdcSHeiko Carstens device_initcall(s390_cma_mem_init);
27834ad7cdcSHeiko Carstens
27934ad7cdcSHeiko Carstens #endif /* CONFIG_CMA */
28034ad7cdcSHeiko Carstens
arch_add_memory(int nid,u64 start,u64 size,struct mhp_params * params)281940519f0SMichal Hocko int arch_add_memory(int nid, u64 start, u64 size,
282f5637d3bSLogan Gunthorpe struct mhp_params *params)
283421c175cSHeiko Carstens {
284892365abSGerald Schaefer unsigned long start_pfn = PFN_DOWN(start);
285892365abSGerald Schaefer unsigned long size_pages = PFN_DOWN(size);
286f1dd2cd1SMichal Hocko int rc;
287421c175cSHeiko Carstens
288f5637d3bSLogan Gunthorpe if (WARN_ON_ONCE(params->altmap))
289973de24aSDavid Hildenbrand return -EINVAL;
290973de24aSDavid Hildenbrand
291bfeb022fSLogan Gunthorpe if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
292bfeb022fSLogan Gunthorpe return -EINVAL;
293bfeb022fSLogan Gunthorpe
2947707248aSAnshuman Khandual VM_BUG_ON(!mhp_range_allowed(start, size, true));
295421c175cSHeiko Carstens rc = vmem_add_mapping(start, size);
296421c175cSHeiko Carstens if (rc)
297421c175cSHeiko Carstens return rc;
298199071f1SGerald Schaefer
299f5637d3bSLogan Gunthorpe rc = __add_pages(nid, start_pfn, size_pages, params);
300421c175cSHeiko Carstens if (rc)
301421c175cSHeiko Carstens vmem_remove_mapping(start, size);
302421c175cSHeiko Carstens return rc;
303421c175cSHeiko Carstens }
30424d335caSWen Congyang
arch_remove_memory(u64 start,u64 size,struct vmem_altmap * altmap)30565a2aa5fSDavid Hildenbrand void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
30624d335caSWen Congyang {
30718c86506SDavid Hildenbrand unsigned long start_pfn = start >> PAGE_SHIFT;
30818c86506SDavid Hildenbrand unsigned long nr_pages = size >> PAGE_SHIFT;
30918c86506SDavid Hildenbrand
310feee6b29SDavid Hildenbrand __remove_pages(start_pfn, nr_pages, altmap);
31118c86506SDavid Hildenbrand vmem_remove_mapping(start, size);
31224d335caSWen Congyang }
313421c175cSHeiko Carstens #endif /* CONFIG_MEMORY_HOTPLUG */
314