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b2fa47e6bf
Rework the architecture page table functions to access the bits in the page table extension array (pgste). There are a number of changes: 1) Fix missing pgste update if the attach_count for the mm is <= 1. 2) For every operation that affects the invalid bit in the pte or the rcp byte in the pgste the pcl lock needs to be acquired. The function pgste_get_lock gets the pcl lock and returns the current pgste value for a pte pointer. The function pgste_set_unlock stores the pgste and releases the lock. Between these two calls the bits in the pgste can be shuffled. 3) Define two software bits in the pte _PAGE_SWR and _PAGE_SWC to avoid calling SetPageDirty and SetPageReferenced from pgtable.h. If the host reference backup bit or the host change backup bit has been set the dirty/referenced state is transfered to the pte. The common code will pick up the state from the pte. 4) Add ptep_modify_prot_start and ptep_modify_prot_commit for mprotect. 5) Remove pgd_populate_kernel, pud_populate_kernel, pmd_populate_kernel pgd_clear_kernel, pud_clear_kernel, pmd_clear_kernel and ptep_invalidate. 6) Rename kvm_s390_test_and_clear_page_dirty to ptep_test_and_clear_user_dirty and add ptep_test_and_clear_user_young. 7) Define mm_exclusive() and mm_has_pgste() helper to improve readability. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
238 lines
5.9 KiB
C
238 lines
5.9 KiB
C
/*
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* arch/s390/mm/init.c
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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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/pfn.h>
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#include <linux/poison.h>
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#include <linux/initrd.h>
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#include <linux/gfp.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/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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pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
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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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static unsigned long setup_zero_pages(void)
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{
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struct cpuid cpu_id;
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unsigned int order;
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unsigned long size;
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struct page *page;
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int i;
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get_cpu_id(&cpu_id);
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switch (cpu_id.machine) {
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case 0x9672: /* g5 */
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case 0x2064: /* z900 */
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case 0x2066: /* z900 */
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case 0x2084: /* z990 */
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case 0x2086: /* z990 */
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case 0x2094: /* z9-109 */
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case 0x2096: /* z9-109 */
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order = 0;
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break;
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case 0x2097: /* z10 */
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case 0x2098: /* z10 */
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default:
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order = 2;
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break;
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}
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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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SetPageReserved(page);
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page++;
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}
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size = PAGE_SIZE << order;
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zero_page_mask = (size - 1) & PAGE_MASK;
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return 1UL << order;
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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;
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init_mm.pgd = swapper_pg_dir;
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S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
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#ifdef CONFIG_64BIT
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/* A three level page table (4TB) is enough for the kernel space. */
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S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
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pgd_type = _REGION3_ENTRY_EMPTY;
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#else
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S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH;
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pgd_type = _SEGMENT_ENTRY_EMPTY;
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#endif
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clear_table((unsigned long *) init_mm.pgd, pgd_type,
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sizeof(unsigned long)*2048);
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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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arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
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atomic_set(&init_mm.context.attach_count, 1);
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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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#ifdef CONFIG_ZONE_DMA
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max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
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#endif
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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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fault_init();
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}
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void __init mem_init(void)
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{
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unsigned long codesize, reservedpages, datasize, initsize;
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max_mapnr = num_physpages = 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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totalram_pages += free_all_bootmem();
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totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
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reservedpages = 0;
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codesize = (unsigned long) &_etext - (unsigned long) &_text;
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datasize = (unsigned long) &_edata - (unsigned long) &_etext;
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initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
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printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
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nr_free_pages() << (PAGE_SHIFT-10),
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max_mapnr << (PAGE_SHIFT-10),
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codesize >> 10,
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reservedpages << (PAGE_SHIFT-10),
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datasize >>10,
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initsize >> 10);
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printk("Write protected kernel read-only data: %#lx - %#lx\n",
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(unsigned long)&_stext,
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PFN_ALIGN((unsigned long)&_eshared) - 1);
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}
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#ifdef CONFIG_DEBUG_PAGEALLOC
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void kernel_map_pages(struct page *page, int numpages, int enable)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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unsigned long address;
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int i;
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for (i = 0; i < numpages; i++) {
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address = page_to_phys(page + i);
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pgd = pgd_offset_k(address);
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pud = pud_offset(pgd, address);
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pmd = pmd_offset(pud, address);
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pte = pte_offset_kernel(pmd, address);
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if (!enable) {
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__ptep_ipte(address, pte);
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pte_val(*pte) = _PAGE_TYPE_EMPTY;
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continue;
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}
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*pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
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/* Flush cpu write queue. */
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mb();
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}
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}
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#endif
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void free_init_pages(char *what, unsigned long begin, unsigned long end)
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{
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unsigned long addr = begin;
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if (begin >= end)
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return;
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for (; addr < end; addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
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PAGE_SIZE);
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free_page(addr);
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totalram_pages++;
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}
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printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
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}
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void free_initmem(void)
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{
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free_init_pages("unused kernel memory",
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(unsigned long)&__init_begin,
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(unsigned long)&__init_end);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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free_init_pages("initrd memory", start, end);
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}
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#endif
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#ifdef CONFIG_MEMORY_HOTPLUG
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int arch_add_memory(int nid, u64 start, u64 size)
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{
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struct pglist_data *pgdat;
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struct zone *zone;
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int rc;
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pgdat = NODE_DATA(nid);
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zone = pgdat->node_zones + ZONE_MOVABLE;
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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, zone, PFN_DOWN(start), PFN_DOWN(size));
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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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#endif /* CONFIG_MEMORY_HOTPLUG */
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