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 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 */ 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)); 10139b742f9SHeiko Carstens max_zone_pfns[ZONE_DMA] = PFN_DOWN(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 10691d37211SHeiko Carstens void mark_rodata_ro(void) 10791d37211SHeiko Carstens { 108d07a980cSHeiko Carstens unsigned long size = __end_ro_after_init - __start_ro_after_init; 109d07a980cSHeiko Carstens 110*a7eb2880SHeiko 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 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 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? */ 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 */ 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 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 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 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 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 201254b2fd0SHeiko Carstens static int __init pcpu_cpu_to_node(int cpu) 202254b2fd0SHeiko Carstens { 203254b2fd0SHeiko Carstens return 0; 204254b2fd0SHeiko Carstens } 205254b2fd0SHeiko Carstens 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 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 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 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 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 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