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> 211da177e4SLinus Torvalds #include <linux/smp.h> 221da177e4SLinus Torvalds #include <linux/init.h> 231da177e4SLinus Torvalds #include <linux/pagemap.h> 241da177e4SLinus Torvalds #include <linux/bootmem.h> 25e5d709bbSHeiko Carstens #include <linux/memory.h> 26d882b172SHeiko Carstens #include <linux/pfn.h> 27028d9b3cSHeiko Carstens #include <linux/poison.h> 282b67fc46SHeiko Carstens #include <linux/initrd.h> 293a4c5d59SHeiko Carstens #include <linux/export.h> 3034ad7cdcSHeiko Carstens #include <linux/cma.h> 315a0e3ad6STejun Heo #include <linux/gfp.h> 32199071f1SGerald Schaefer #include <linux/memblock.h> 331da177e4SLinus Torvalds #include <asm/processor.h> 347c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 351da177e4SLinus Torvalds #include <asm/pgtable.h> 361da177e4SLinus Torvalds #include <asm/pgalloc.h> 371da177e4SLinus Torvalds #include <asm/dma.h> 381da177e4SLinus Torvalds #include <asm/lowcore.h> 391da177e4SLinus Torvalds #include <asm/tlb.h> 401da177e4SLinus Torvalds #include <asm/tlbflush.h> 41d882b172SHeiko Carstens #include <asm/sections.h> 42a0616cdeSDavid Howells #include <asm/ctl_reg.h> 43e5d709bbSHeiko Carstens #include <asm/sclp.h> 44e6c7c630SLaura Abbott #include <asm/set_memory.h> 451da177e4SLinus Torvalds 460ccb32c9SHeiko Carstens pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir); 471485c5c8SHeiko Carstens 48238ec4efSMartin Schwidefsky unsigned long empty_zero_page, zero_page_mask; 491485c5c8SHeiko Carstens EXPORT_SYMBOL(empty_zero_page); 500b70068eSArd Biesheuvel EXPORT_SYMBOL(zero_page_mask); 511da177e4SLinus Torvalds 520999f119SJiang Liu static void __init setup_zero_pages(void) 53238ec4efSMartin Schwidefsky { 54238ec4efSMartin Schwidefsky unsigned int order; 55238ec4efSMartin Schwidefsky struct page *page; 56238ec4efSMartin Schwidefsky int i; 57238ec4efSMartin Schwidefsky 58c7e8b2c2SMartin Schwidefsky /* Latest machines require a mapping granularity of 512KB */ 591f6b83e5SMartin Schwidefsky order = 7; 60c7e8b2c2SMartin Schwidefsky 617919e91bSMartin Schwidefsky /* Limit number of empty zero pages for small memory sizes */ 621f6b83e5SMartin Schwidefsky while (order > 2 && (totalram_pages >> 10) < (1UL << order)) 631f6b83e5SMartin Schwidefsky order--; 64238ec4efSMartin Schwidefsky 65238ec4efSMartin Schwidefsky empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 66238ec4efSMartin Schwidefsky if (!empty_zero_page) 67238ec4efSMartin Schwidefsky panic("Out of memory in setup_zero_pages"); 68238ec4efSMartin Schwidefsky 69238ec4efSMartin Schwidefsky page = virt_to_page((void *) empty_zero_page); 70238ec4efSMartin Schwidefsky split_page(page, order); 71238ec4efSMartin Schwidefsky for (i = 1 << order; i > 0; i--) { 720999f119SJiang Liu mark_page_reserved(page); 73238ec4efSMartin Schwidefsky page++; 74238ec4efSMartin Schwidefsky } 75238ec4efSMartin Schwidefsky 760999f119SJiang Liu zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; 77238ec4efSMartin Schwidefsky } 78238ec4efSMartin Schwidefsky 791da177e4SLinus Torvalds /* 801da177e4SLinus Torvalds * paging_init() sets up the page tables 811da177e4SLinus Torvalds */ 821da177e4SLinus Torvalds void __init paging_init(void) 831da177e4SLinus Torvalds { 8439b742f9SHeiko Carstens unsigned long max_zone_pfns[MAX_NR_ZONES]; 8514045ebfSMartin Schwidefsky unsigned long pgd_type, asce_bits; 8660c49701SHeiko Carstens psw_t psw; 871da177e4SLinus Torvalds 883610cce8SMartin Schwidefsky init_mm.pgd = swapper_pg_dir; 89f1c1174fSHeiko Carstens if (VMALLOC_END > _REGION2_SIZE) { 9014045ebfSMartin Schwidefsky asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; 9114045ebfSMartin Schwidefsky pgd_type = _REGION2_ENTRY_EMPTY; 9214045ebfSMartin Schwidefsky } else { 9314045ebfSMartin Schwidefsky asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; 946252d702SMartin Schwidefsky pgd_type = _REGION3_ENTRY_EMPTY; 9514045ebfSMartin Schwidefsky } 96723cacbdSGerald Schaefer init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; 97723cacbdSGerald Schaefer S390_lowcore.kernel_asce = init_mm.context.asce; 980aaba41bSMartin Schwidefsky S390_lowcore.user_asce = S390_lowcore.kernel_asce; 99f1c1174fSHeiko Carstens crst_table_init((unsigned long *) init_mm.pgd, pgd_type); 100f4eb07c1SHeiko Carstens vmem_map_init(); 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds /* enable virtual mapping in kernel mode */ 1033610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 1, 1); 1043610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 7, 7); 1053610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 13, 13); 10660c49701SHeiko Carstens psw.mask = __extract_psw(); 107a7525982SHeiko Carstens psw_bits(psw).dat = 1; 1088bb3fdd6SHeiko Carstens psw_bits(psw).as = PSW_BITS_AS_HOME; 10960c49701SHeiko Carstens __load_psw_mask(psw.mask); 1101da177e4SLinus Torvalds 11117f34580SHeiko Carstens sparse_memory_present_with_active_regions(MAX_NUMNODES); 11217f34580SHeiko Carstens sparse_init(); 11339b742f9SHeiko Carstens memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 11439b742f9SHeiko Carstens max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); 11539b742f9SHeiko Carstens max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 11639b742f9SHeiko Carstens free_area_init_nodes(max_zone_pfns); 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 11991d37211SHeiko Carstens void mark_rodata_ro(void) 12091d37211SHeiko Carstens { 121d07a980cSHeiko Carstens unsigned long size = __end_ro_after_init - __start_ro_after_init; 122d07a980cSHeiko Carstens 123d07a980cSHeiko Carstens set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT); 124d07a980cSHeiko Carstens pr_info("Write protected read-only-after-init data: %luk\n", size >> 10); 12591d37211SHeiko Carstens } 12691d37211SHeiko Carstens 1271da177e4SLinus Torvalds void __init mem_init(void) 1281da177e4SLinus Torvalds { 1291b948d6cSMartin Schwidefsky cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); 1301b948d6cSMartin Schwidefsky cpumask_set_cpu(0, mm_cpumask(&init_mm)); 1311b948d6cSMartin Schwidefsky 1323a368f74SPhilipp Hachtmann set_max_mapnr(max_low_pfn); 1331da177e4SLinus Torvalds high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 1341da177e4SLinus Torvalds 13545e576b1SMartin Schwidefsky /* Setup guest page hinting */ 13645e576b1SMartin Schwidefsky cmma_init(); 13745e576b1SMartin Schwidefsky 1381da177e4SLinus Torvalds /* this will put all low memory onto the freelists */ 1390c988534SJiang Liu free_all_bootmem(); 1400999f119SJiang Liu setup_zero_pages(); /* Setup zeroed pages. */ 1411da177e4SLinus Torvalds 142c9b5ad54SMartin Schwidefsky cmma_init_nodat(); 143c9b5ad54SMartin Schwidefsky 144a18d0e2dSJiang Liu mem_init_print_info(NULL); 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 147d96221abSHeiko Carstens void free_initmem(void) 148d96221abSHeiko Carstens { 14957d7f939SMartin Schwidefsky __set_memory((unsigned long)_sinittext, 150ead7a22eSHeiko Carstens (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT, 15157d7f939SMartin Schwidefsky SET_MEMORY_RW | SET_MEMORY_NX); 152dbe67df4SJiang Liu free_initmem_default(POISON_FREE_INITMEM); 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1565e249d6eSHeiko Carstens void __init free_initrd_mem(unsigned long start, unsigned long end) 1571da177e4SLinus Torvalds { 15811199692SJiang Liu free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, 15911199692SJiang Liu "initrd"); 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds #endif 162421c175cSHeiko Carstens 163604ddad0SHeiko Carstens unsigned long memory_block_size_bytes(void) 164604ddad0SHeiko Carstens { 165604ddad0SHeiko Carstens /* 166604ddad0SHeiko Carstens * Make sure the memory block size is always greater 167604ddad0SHeiko Carstens * or equal than the memory increment size. 168604ddad0SHeiko Carstens */ 169604ddad0SHeiko Carstens return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm); 170604ddad0SHeiko Carstens } 171604ddad0SHeiko Carstens 172421c175cSHeiko Carstens #ifdef CONFIG_MEMORY_HOTPLUG 17334ad7cdcSHeiko Carstens 17434ad7cdcSHeiko Carstens #ifdef CONFIG_CMA 17534ad7cdcSHeiko Carstens 17634ad7cdcSHeiko Carstens /* Prevent memory blocks which contain cma regions from going offline */ 17734ad7cdcSHeiko Carstens 17834ad7cdcSHeiko Carstens struct s390_cma_mem_data { 17934ad7cdcSHeiko Carstens unsigned long start; 18034ad7cdcSHeiko Carstens unsigned long end; 18134ad7cdcSHeiko Carstens }; 18234ad7cdcSHeiko Carstens 18334ad7cdcSHeiko Carstens static int s390_cma_check_range(struct cma *cma, void *data) 18434ad7cdcSHeiko Carstens { 18534ad7cdcSHeiko Carstens struct s390_cma_mem_data *mem_data; 18634ad7cdcSHeiko Carstens unsigned long start, end; 18734ad7cdcSHeiko Carstens 18834ad7cdcSHeiko Carstens mem_data = data; 18934ad7cdcSHeiko Carstens start = cma_get_base(cma); 19034ad7cdcSHeiko Carstens end = start + cma_get_size(cma); 19134ad7cdcSHeiko Carstens if (end < mem_data->start) 19234ad7cdcSHeiko Carstens return 0; 19334ad7cdcSHeiko Carstens if (start >= mem_data->end) 19434ad7cdcSHeiko Carstens return 0; 19534ad7cdcSHeiko Carstens return -EBUSY; 19634ad7cdcSHeiko Carstens } 19734ad7cdcSHeiko Carstens 19834ad7cdcSHeiko Carstens static int s390_cma_mem_notifier(struct notifier_block *nb, 19934ad7cdcSHeiko Carstens unsigned long action, void *data) 20034ad7cdcSHeiko Carstens { 20134ad7cdcSHeiko Carstens struct s390_cma_mem_data mem_data; 20234ad7cdcSHeiko Carstens struct memory_notify *arg; 20334ad7cdcSHeiko Carstens int rc = 0; 20434ad7cdcSHeiko Carstens 20534ad7cdcSHeiko Carstens arg = data; 20634ad7cdcSHeiko Carstens mem_data.start = arg->start_pfn << PAGE_SHIFT; 20734ad7cdcSHeiko Carstens mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT); 20834ad7cdcSHeiko Carstens if (action == MEM_GOING_OFFLINE) 20934ad7cdcSHeiko Carstens rc = cma_for_each_area(s390_cma_check_range, &mem_data); 21034ad7cdcSHeiko Carstens return notifier_from_errno(rc); 21134ad7cdcSHeiko Carstens } 21234ad7cdcSHeiko Carstens 21334ad7cdcSHeiko Carstens static struct notifier_block s390_cma_mem_nb = { 21434ad7cdcSHeiko Carstens .notifier_call = s390_cma_mem_notifier, 21534ad7cdcSHeiko Carstens }; 21634ad7cdcSHeiko Carstens 21734ad7cdcSHeiko Carstens static int __init s390_cma_mem_init(void) 21834ad7cdcSHeiko Carstens { 21934ad7cdcSHeiko Carstens return register_memory_notifier(&s390_cma_mem_nb); 22034ad7cdcSHeiko Carstens } 22134ad7cdcSHeiko Carstens device_initcall(s390_cma_mem_init); 22234ad7cdcSHeiko Carstens 22334ad7cdcSHeiko Carstens #endif /* CONFIG_CMA */ 22434ad7cdcSHeiko Carstens 22524e6d5a5SChristoph Hellwig int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, 22624e6d5a5SChristoph Hellwig bool want_memblock) 227421c175cSHeiko Carstens { 228892365abSGerald Schaefer unsigned long start_pfn = PFN_DOWN(start); 229892365abSGerald Schaefer unsigned long size_pages = PFN_DOWN(size); 230f1dd2cd1SMichal Hocko int rc; 231421c175cSHeiko Carstens 232421c175cSHeiko Carstens rc = vmem_add_mapping(start, size); 233421c175cSHeiko Carstens if (rc) 234421c175cSHeiko Carstens return rc; 235199071f1SGerald Schaefer 23624e6d5a5SChristoph Hellwig rc = __add_pages(nid, start_pfn, size_pages, altmap, want_memblock); 237421c175cSHeiko Carstens if (rc) 238421c175cSHeiko Carstens vmem_remove_mapping(start, size); 239421c175cSHeiko Carstens return rc; 240421c175cSHeiko Carstens } 24124d335caSWen Congyang 24224d335caSWen Congyang #ifdef CONFIG_MEMORY_HOTREMOVE 24324d335caSWen Congyang int arch_remove_memory(u64 start, u64 size) 24424d335caSWen Congyang { 24524d335caSWen Congyang /* 24624d335caSWen Congyang * There is no hardware or firmware interface which could trigger a 24724d335caSWen Congyang * hot memory remove on s390. So there is nothing that needs to be 24824d335caSWen Congyang * implemented. 24924d335caSWen Congyang */ 25024d335caSWen Congyang return -EBUSY; 25124d335caSWen Congyang } 25224d335caSWen Congyang #endif 253421c175cSHeiko Carstens #endif /* CONFIG_MEMORY_HOTPLUG */ 254