252 lines
6.2 KiB
C
252 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* S390 version
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* Copyright IBM Corp. 1999
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* Author(s): Hartmut Penner (hp@de.ibm.com)
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/pagemap.h>
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#include <linux/bootmem.h>
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#include <linux/memory.h>
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#include <linux/pfn.h>
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#include <linux/poison.h>
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#include <linux/initrd.h>
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#include <linux/export.h>
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#include <linux/cma.h>
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#include <linux/gfp.h>
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#include <linux/memblock.h>
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#include <asm/processor.h>
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#include <linux/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/dma.h>
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#include <asm/lowcore.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/sections.h>
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#include <asm/ctl_reg.h>
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#include <asm/sclp.h>
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#include <asm/set_memory.h>
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
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unsigned long empty_zero_page, zero_page_mask;
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EXPORT_SYMBOL(empty_zero_page);
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EXPORT_SYMBOL(zero_page_mask);
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static void __init setup_zero_pages(void)
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{
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unsigned int order;
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struct page *page;
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int i;
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/* Latest machines require a mapping granularity of 512KB */
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order = 7;
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/* Limit number of empty zero pages for small memory sizes */
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while (order > 2 && (totalram_pages >> 10) < (1UL << order))
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order--;
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empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
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if (!empty_zero_page)
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panic("Out of memory in setup_zero_pages");
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page = virt_to_page((void *) empty_zero_page);
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split_page(page, order);
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for (i = 1 << order; i > 0; i--) {
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mark_page_reserved(page);
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page++;
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}
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zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
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}
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/*
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* paging_init() sets up the page tables
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*/
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void __init paging_init(void)
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{
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unsigned long max_zone_pfns[MAX_NR_ZONES];
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unsigned long pgd_type, asce_bits;
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psw_t psw;
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init_mm.pgd = swapper_pg_dir;
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if (VMALLOC_END > _REGION2_SIZE) {
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asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
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pgd_type = _REGION2_ENTRY_EMPTY;
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} else {
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asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
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pgd_type = _REGION3_ENTRY_EMPTY;
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}
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init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
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S390_lowcore.kernel_asce = init_mm.context.asce;
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S390_lowcore.user_asce = S390_lowcore.kernel_asce;
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crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
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vmem_map_init();
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/* enable virtual mapping in kernel mode */
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__ctl_load(S390_lowcore.kernel_asce, 1, 1);
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__ctl_load(S390_lowcore.kernel_asce, 7, 7);
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__ctl_load(S390_lowcore.kernel_asce, 13, 13);
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psw.mask = __extract_psw();
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psw_bits(psw).dat = 1;
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psw_bits(psw).as = PSW_BITS_AS_HOME;
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__load_psw_mask(psw.mask);
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sparse_memory_present_with_active_regions(MAX_NUMNODES);
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sparse_init();
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memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
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max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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free_area_init_nodes(max_zone_pfns);
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}
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void mark_rodata_ro(void)
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{
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unsigned long size = __end_ro_after_init - __start_ro_after_init;
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set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT);
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pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
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}
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void __init mem_init(void)
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{
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cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
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cpumask_set_cpu(0, mm_cpumask(&init_mm));
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set_max_mapnr(max_low_pfn);
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high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
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/* Setup guest page hinting */
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cmma_init();
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/* this will put all low memory onto the freelists */
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free_all_bootmem();
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setup_zero_pages(); /* Setup zeroed pages. */
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cmma_init_nodat();
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mem_init_print_info(NULL);
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}
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void free_initmem(void)
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{
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__set_memory((unsigned long)_sinittext,
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(unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
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SET_MEMORY_RW | SET_MEMORY_NX);
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free_initmem_default(POISON_FREE_INITMEM);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void __init free_initrd_mem(unsigned long start, unsigned long end)
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{
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free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
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"initrd");
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}
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#endif
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unsigned long memory_block_size_bytes(void)
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{
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/*
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* Make sure the memory block size is always greater
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* or equal than the memory increment size.
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*/
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return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
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}
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#ifdef CONFIG_MEMORY_HOTPLUG
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#ifdef CONFIG_CMA
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/* Prevent memory blocks which contain cma regions from going offline */
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struct s390_cma_mem_data {
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unsigned long start;
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unsigned long end;
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};
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static int s390_cma_check_range(struct cma *cma, void *data)
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{
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struct s390_cma_mem_data *mem_data;
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unsigned long start, end;
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mem_data = data;
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start = cma_get_base(cma);
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end = start + cma_get_size(cma);
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if (end < mem_data->start)
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return 0;
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if (start >= mem_data->end)
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return 0;
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return -EBUSY;
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}
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static int s390_cma_mem_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct s390_cma_mem_data mem_data;
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struct memory_notify *arg;
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int rc = 0;
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arg = data;
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mem_data.start = arg->start_pfn << PAGE_SHIFT;
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mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
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if (action == MEM_GOING_OFFLINE)
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rc = cma_for_each_area(s390_cma_check_range, &mem_data);
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return notifier_from_errno(rc);
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}
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static struct notifier_block s390_cma_mem_nb = {
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.notifier_call = s390_cma_mem_notifier,
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};
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static int __init s390_cma_mem_init(void)
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{
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return register_memory_notifier(&s390_cma_mem_nb);
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}
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device_initcall(s390_cma_mem_init);
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#endif /* CONFIG_CMA */
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int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
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bool want_memblock)
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{
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unsigned long start_pfn = PFN_DOWN(start);
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unsigned long size_pages = PFN_DOWN(size);
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int rc;
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rc = vmem_add_mapping(start, size);
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if (rc)
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return rc;
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rc = __add_pages(nid, start_pfn, size_pages, altmap, want_memblock);
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if (rc)
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vmem_remove_mapping(start, size);
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return rc;
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}
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void arch_remove_memory(int nid, u64 start, u64 size,
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struct vmem_altmap *altmap)
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{
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unsigned long start_pfn = start >> PAGE_SHIFT;
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unsigned long nr_pages = size >> PAGE_SHIFT;
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__remove_pages(start_pfn, nr_pages, altmap);
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vmem_remove_mapping(start, size);
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}
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#endif /* CONFIG_MEMORY_HOTPLUG */
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