| /* |
| * linux/arch/x86_64/mm/init.c |
| * |
| * Copyright (C) 1995 Linus Torvalds |
| * Copyright (C) 2000 Pavel Machek <pavel@ucw.cz> |
| * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de> |
| */ |
| |
| #include <linux/signal.h> |
| #include <linux/sched.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <linux/ptrace.h> |
| #include <linux/mman.h> |
| #include <linux/mm.h> |
| #include <linux/swap.h> |
| #include <linux/smp.h> |
| #include <linux/init.h> |
| #include <linux/initrd.h> |
| #include <linux/pagemap.h> |
| #include <linux/bootmem.h> |
| #include <linux/memblock.h> |
| #include <linux/proc_fs.h> |
| #include <linux/pci.h> |
| #include <linux/pfn.h> |
| #include <linux/poison.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/module.h> |
| #include <linux/memory.h> |
| #include <linux/memory_hotplug.h> |
| #include <linux/nmi.h> |
| #include <linux/gfp.h> |
| #include <linux/kcore.h> |
| |
| #include <asm/processor.h> |
| #include <asm/bios_ebda.h> |
| #include <asm/uaccess.h> |
| #include <asm/pgtable.h> |
| #include <asm/pgalloc.h> |
| #include <asm/dma.h> |
| #include <asm/fixmap.h> |
| #include <asm/e820.h> |
| #include <asm/apic.h> |
| #include <asm/tlb.h> |
| #include <asm/mmu_context.h> |
| #include <asm/proto.h> |
| #include <asm/smp.h> |
| #include <asm/sections.h> |
| #include <asm/kdebug.h> |
| #include <asm/numa.h> |
| #include <asm/cacheflush.h> |
| #include <asm/init.h> |
| #include <asm/uv/uv.h> |
| #include <asm/setup.h> |
| |
| #include "mm_internal.h" |
| |
| static void ident_pmd_init(unsigned long pmd_flag, pmd_t *pmd_page, |
| unsigned long addr, unsigned long end) |
| { |
| addr &= PMD_MASK; |
| for (; addr < end; addr += PMD_SIZE) { |
| pmd_t *pmd = pmd_page + pmd_index(addr); |
| |
| if (!pmd_present(*pmd)) |
| set_pmd(pmd, __pmd(addr | pmd_flag)); |
| } |
| } |
| static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page, |
| unsigned long addr, unsigned long end) |
| { |
| unsigned long next; |
| |
| for (; addr < end; addr = next) { |
| pud_t *pud = pud_page + pud_index(addr); |
| pmd_t *pmd; |
| |
| next = (addr & PUD_MASK) + PUD_SIZE; |
| if (next > end) |
| next = end; |
| |
| if (pud_present(*pud)) { |
| pmd = pmd_offset(pud, 0); |
| ident_pmd_init(info->pmd_flag, pmd, addr, next); |
| continue; |
| } |
| pmd = (pmd_t *)info->alloc_pgt_page(info->context); |
| if (!pmd) |
| return -ENOMEM; |
| ident_pmd_init(info->pmd_flag, pmd, addr, next); |
| set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); |
| } |
| |
| return 0; |
| } |
| |
| int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page, |
| unsigned long addr, unsigned long end) |
| { |
| unsigned long next; |
| int result; |
| int off = info->kernel_mapping ? pgd_index(__PAGE_OFFSET) : 0; |
| |
| for (; addr < end; addr = next) { |
| pgd_t *pgd = pgd_page + pgd_index(addr) + off; |
| pud_t *pud; |
| |
| next = (addr & PGDIR_MASK) + PGDIR_SIZE; |
| if (next > end) |
| next = end; |
| |
| if (pgd_present(*pgd)) { |
| pud = pud_offset(pgd, 0); |
| result = ident_pud_init(info, pud, addr, next); |
| if (result) |
| return result; |
| continue; |
| } |
| |
| pud = (pud_t *)info->alloc_pgt_page(info->context); |
| if (!pud) |
| return -ENOMEM; |
| result = ident_pud_init(info, pud, addr, next); |
| if (result) |
| return result; |
| set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE)); |
| } |
| |
| return 0; |
| } |
| |
| static int __init parse_direct_gbpages_off(char *arg) |
| { |
| direct_gbpages = 0; |
| return 0; |
| } |
| early_param("nogbpages", parse_direct_gbpages_off); |
| |
| static int __init parse_direct_gbpages_on(char *arg) |
| { |
| direct_gbpages = 1; |
| return 0; |
| } |
| early_param("gbpages", parse_direct_gbpages_on); |
| |
| /* |
| * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the |
| * physical space so we can cache the place of the first one and move |
| * around without checking the pgd every time. |
| */ |
| |
| pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP; |
| EXPORT_SYMBOL_GPL(__supported_pte_mask); |
| |
| int force_personality32; |
| |
| /* |
| * noexec32=on|off |
| * Control non executable heap for 32bit processes. |
| * To control the stack too use noexec=off |
| * |
| * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) |
| * off PROT_READ implies PROT_EXEC |
| */ |
| static int __init nonx32_setup(char *str) |
| { |
| if (!strcmp(str, "on")) |
| force_personality32 &= ~READ_IMPLIES_EXEC; |
| else if (!strcmp(str, "off")) |
| force_personality32 |= READ_IMPLIES_EXEC; |
| return 1; |
| } |
| __setup("noexec32=", nonx32_setup); |
| |
| /* |
| * When memory was added/removed make sure all the processes MM have |
| * suitable PGD entries in the local PGD level page. |
| */ |
| void sync_global_pgds(unsigned long start, unsigned long end) |
| { |
| unsigned long address; |
| |
| for (address = start; address <= end; address += PGDIR_SIZE) { |
| const pgd_t *pgd_ref = pgd_offset_k(address); |
| struct page *page; |
| |
| if (pgd_none(*pgd_ref)) |
| continue; |
| |
| spin_lock(&pgd_lock); |
| list_for_each_entry(page, &pgd_list, lru) { |
| pgd_t *pgd; |
| spinlock_t *pgt_lock; |
| |
| pgd = (pgd_t *)page_address(page) + pgd_index(address); |
| /* the pgt_lock only for Xen */ |
| pgt_lock = &pgd_page_get_mm(page)->page_table_lock; |
| spin_lock(pgt_lock); |
| |
| if (pgd_none(*pgd)) |
| set_pgd(pgd, *pgd_ref); |
| else |
| BUG_ON(pgd_page_vaddr(*pgd) |
| != pgd_page_vaddr(*pgd_ref)); |
| |
| spin_unlock(pgt_lock); |
| } |
| spin_unlock(&pgd_lock); |
| } |
| } |
| |
| /* |
| * NOTE: This function is marked __ref because it calls __init function |
| * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. |
| */ |
| static __ref void *spp_getpage(void) |
| { |
| void *ptr; |
| |
| if (after_bootmem) |
| ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); |
| else |
| ptr = alloc_bootmem_pages(PAGE_SIZE); |
| |
| if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { |
| panic("set_pte_phys: cannot allocate page data %s\n", |
| after_bootmem ? "after bootmem" : ""); |
| } |
| |
| pr_debug("spp_getpage %p\n", ptr); |
| |
| return ptr; |
| } |
| |
| static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr) |
| { |
| if (pgd_none(*pgd)) { |
| pud_t *pud = (pud_t *)spp_getpage(); |
| pgd_populate(&init_mm, pgd, pud); |
| if (pud != pud_offset(pgd, 0)) |
| printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", |
| pud, pud_offset(pgd, 0)); |
| } |
| return pud_offset(pgd, vaddr); |
| } |
| |
| static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr) |
| { |
| if (pud_none(*pud)) { |
| pmd_t *pmd = (pmd_t *) spp_getpage(); |
| pud_populate(&init_mm, pud, pmd); |
| if (pmd != pmd_offset(pud, 0)) |
| printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
| pmd, pmd_offset(pud, 0)); |
| } |
| return pmd_offset(pud, vaddr); |
| } |
| |
| static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr) |
| { |
| if (pmd_none(*pmd)) { |
| pte_t *pte = (pte_t *) spp_getpage(); |
| pmd_populate_kernel(&init_mm, pmd, pte); |
| if (pte != pte_offset_kernel(pmd, 0)) |
| printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
| } |
| return pte_offset_kernel(pmd, vaddr); |
| } |
| |
| void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) |
| { |
| pud_t *pud; |
| pmd_t *pmd; |
| pte_t *pte; |
| |
| pud = pud_page + pud_index(vaddr); |
| pmd = fill_pmd(pud, vaddr); |
| pte = fill_pte(pmd, vaddr); |
| |
| set_pte(pte, new_pte); |
| |
| /* |
| * It's enough to flush this one mapping. |
| * (PGE mappings get flushed as well) |
| */ |
| __flush_tlb_one(vaddr); |
| } |
| |
| void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
| { |
| pgd_t *pgd; |
| pud_t *pud_page; |
| |
| pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); |
| |
| pgd = pgd_offset_k(vaddr); |
| if (pgd_none(*pgd)) { |
| printk(KERN_ERR |
| "PGD FIXMAP MISSING, it should be setup in head.S!\n"); |
| return; |
| } |
| pud_page = (pud_t*)pgd_page_vaddr(*pgd); |
| set_pte_vaddr_pud(pud_page, vaddr, pteval); |
| } |
| |
| pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
| { |
| pgd_t *pgd; |
| pud_t *pud; |
| |
| pgd = pgd_offset_k(vaddr); |
| pud = fill_pud(pgd, vaddr); |
| return fill_pmd(pud, vaddr); |
| } |
| |
| pte_t * __init populate_extra_pte(unsigned long vaddr) |
| { |
| pmd_t *pmd; |
| |
| pmd = populate_extra_pmd(vaddr); |
| return fill_pte(pmd, vaddr); |
| } |
| |
| /* |
| * Create large page table mappings for a range of physical addresses. |
| */ |
| static void __init __init_extra_mapping(unsigned long phys, unsigned long size, |
| pgprot_t prot) |
| { |
| pgd_t *pgd; |
| pud_t *pud; |
| pmd_t *pmd; |
| |
| BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); |
| for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { |
| pgd = pgd_offset_k((unsigned long)__va(phys)); |
| if (pgd_none(*pgd)) { |
| pud = (pud_t *) spp_getpage(); |
| set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | |
| _PAGE_USER)); |
| } |
| pud = pud_offset(pgd, (unsigned long)__va(phys)); |
| if (pud_none(*pud)) { |
| pmd = (pmd_t *) spp_getpage(); |
| set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | |
| _PAGE_USER)); |
| } |
| pmd = pmd_offset(pud, phys); |
| BUG_ON(!pmd_none(*pmd)); |
| set_pmd(pmd, __pmd(phys | pgprot_val(prot))); |
| } |
| } |
| |
| void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) |
| { |
| __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); |
| } |
| |
| void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) |
| { |
| __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); |
| } |
| |
| /* |
| * The head.S code sets up the kernel high mapping: |
| * |
| * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) |
| * |
| * phys_base holds the negative offset to the kernel, which is added |
| * to the compile time generated pmds. This results in invalid pmds up |
| * to the point where we hit the physaddr 0 mapping. |
| * |
| * We limit the mappings to the region from _text to _brk_end. _brk_end |
| * is rounded up to the 2MB boundary. This catches the invalid pmds as |
| * well, as they are located before _text: |
| */ |
| void __init cleanup_highmap(void) |
| { |
| unsigned long vaddr = __START_KERNEL_map; |
| unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE; |
| unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1; |
| pmd_t *pmd = level2_kernel_pgt; |
| |
| /* |
| * Native path, max_pfn_mapped is not set yet. |
| * Xen has valid max_pfn_mapped set in |
| * arch/x86/xen/mmu.c:xen_setup_kernel_pagetable(). |
| */ |
| if (max_pfn_mapped) |
| vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT); |
| |
| for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) { |
| if (pmd_none(*pmd)) |
| continue; |
| if (vaddr < (unsigned long) _text || vaddr > end) |
| set_pmd(pmd, __pmd(0)); |
| } |
| } |
| |
| static unsigned long __meminit |
| phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
| pgprot_t prot) |
| { |
| unsigned long pages = 0, next; |
| unsigned long last_map_addr = end; |
| int i; |
| |
| pte_t *pte = pte_page + pte_index(addr); |
| |
| for (i = pte_index(addr); i < PTRS_PER_PTE; i++, addr = next, pte++) { |
| next = (addr & PAGE_MASK) + PAGE_SIZE; |
| if (addr >= end) { |
| if (!after_bootmem && |
| !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) && |
| !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN)) |
| set_pte(pte, __pte(0)); |
| continue; |
| } |
| |
| /* |
| * We will re-use the existing mapping. |
| * Xen for example has some special requirements, like mapping |
| * pagetable pages as RO. So assume someone who pre-setup |
| * these mappings are more intelligent. |
| */ |
| if (pte_val(*pte)) { |
| if (!after_bootmem) |
| pages++; |
| continue; |
| } |
| |
| if (0) |
| printk(" pte=%p addr=%lx pte=%016lx\n", |
| pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); |
| pages++; |
| set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
| last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
| } |
| |
| update_page_count(PG_LEVEL_4K, pages); |
| |
| return last_map_addr; |
| } |
| |
| static unsigned long __meminit |
| phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, |
| unsigned long page_size_mask, pgprot_t prot) |
| { |
| unsigned long pages = 0, next; |
| unsigned long last_map_addr = end; |
| |
| int i = pmd_index(address); |
| |
| for (; i < PTRS_PER_PMD; i++, address = next) { |
| pmd_t *pmd = pmd_page + pmd_index(address); |
| pte_t *pte; |
| pgprot_t new_prot = prot; |
| |
| next = (address & PMD_MASK) + PMD_SIZE; |
| if (address >= end) { |
| if (!after_bootmem && |
| !e820_any_mapped(address & PMD_MASK, next, E820_RAM) && |
| !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN)) |
| set_pmd(pmd, __pmd(0)); |
| continue; |
| } |
| |
| if (pmd_val(*pmd)) { |
| if (!pmd_large(*pmd)) { |
| spin_lock(&init_mm.page_table_lock); |
| pte = (pte_t *)pmd_page_vaddr(*pmd); |
| last_map_addr = phys_pte_init(pte, address, |
| end, prot); |
| spin_unlock(&init_mm.page_table_lock); |
| continue; |
| } |
| /* |
| * If we are ok with PG_LEVEL_2M mapping, then we will |
| * use the existing mapping, |
| * |
| * Otherwise, we will split the large page mapping but |
| * use the same existing protection bits except for |
| * large page, so that we don't violate Intel's TLB |
| * Application note (317080) which says, while changing |
| * the page sizes, new and old translations should |
| * not differ with respect to page frame and |
| * attributes. |
| */ |
| if (page_size_mask & (1 << PG_LEVEL_2M)) { |
| if (!after_bootmem) |
| pages++; |
| last_map_addr = next; |
| continue; |
| } |
| new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
| } |
| |
| if (page_size_mask & (1<<PG_LEVEL_2M)) { |
| pages++; |
| spin_lock(&init_mm.page_table_lock); |
| set_pte((pte_t *)pmd, |
| pfn_pte((address & PMD_MASK) >> PAGE_SHIFT, |
| __pgprot(pgprot_val(prot) | _PAGE_PSE))); |
| spin_unlock(&init_mm.page_table_lock); |
| last_map_addr = next; |
| continue; |
| } |
| |
| pte = alloc_low_page(); |
| last_map_addr = phys_pte_init(pte, address, end, new_prot); |
| |
| spin_lock(&init_mm.page_table_lock); |
| pmd_populate_kernel(&init_mm, pmd, pte); |
| spin_unlock(&init_mm.page_table_lock); |
| } |
| update_page_count(PG_LEVEL_2M, pages); |
| return last_map_addr; |
| } |
| |
| static unsigned long __meminit |
| phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
| unsigned long page_size_mask) |
| { |
| unsigned long pages = 0, next; |
| unsigned long last_map_addr = end; |
| int i = pud_index(addr); |
| |
| for (; i < PTRS_PER_PUD; i++, addr = next) { |
| pud_t *pud = pud_page + pud_index(addr); |
| pmd_t *pmd; |
| pgprot_t prot = PAGE_KERNEL; |
| |
| next = (addr & PUD_MASK) + PUD_SIZE; |
| if (addr >= end) { |
| if (!after_bootmem && |
| !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) && |
| !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN)) |
| set_pud(pud, __pud(0)); |
| continue; |
| } |
| |
| if (pud_val(*pud)) { |
| if (!pud_large(*pud)) { |
| pmd = pmd_offset(pud, 0); |
| last_map_addr = phys_pmd_init(pmd, addr, end, |
| page_size_mask, prot); |
| __flush_tlb_all(); |
| continue; |
| } |
| /* |
| * If we are ok with PG_LEVEL_1G mapping, then we will |
| * use the existing mapping. |
| * |
| * Otherwise, we will split the gbpage mapping but use |
| * the same existing protection bits except for large |
| * page, so that we don't violate Intel's TLB |
| * Application note (317080) which says, while changing |
| * the page sizes, new and old translations should |
| * not differ with respect to page frame and |
| * attributes. |
| */ |
| if (page_size_mask & (1 << PG_LEVEL_1G)) { |
| if (!after_bootmem) |
| pages++; |
| last_map_addr = next; |
| continue; |
| } |
| prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
| } |
| |
| if (page_size_mask & (1<<PG_LEVEL_1G)) { |
| pages++; |
| spin_lock(&init_mm.page_table_lock); |
| set_pte((pte_t *)pud, |
| pfn_pte((addr & PUD_MASK) >> PAGE_SHIFT, |
| PAGE_KERNEL_LARGE)); |
| spin_unlock(&init_mm.page_table_lock); |
| last_map_addr = next; |
| continue; |
| } |
| |
| pmd = alloc_low_page(); |
| last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
| prot); |
| |
| spin_lock(&init_mm.page_table_lock); |
| pud_populate(&init_mm, pud, pmd); |
| spin_unlock(&init_mm.page_table_lock); |
| } |
| __flush_tlb_all(); |
| |
| update_page_count(PG_LEVEL_1G, pages); |
| |
| return last_map_addr; |
| } |
| |
| unsigned long __meminit |
| kernel_physical_mapping_init(unsigned long start, |
| unsigned long end, |
| unsigned long page_size_mask) |
| { |
| bool pgd_changed = false; |
| unsigned long next, last_map_addr = end; |
| unsigned long addr; |
| |
| start = (unsigned long)__va(start); |
| end = (unsigned long)__va(end); |
| addr = start; |
| |
| for (; start < end; start = next) { |
| pgd_t *pgd = pgd_offset_k(start); |
| pud_t *pud; |
| |
| next = (start & PGDIR_MASK) + PGDIR_SIZE; |
| |
| if (pgd_val(*pgd)) { |
| pud = (pud_t *)pgd_page_vaddr(*pgd); |
| last_map_addr = phys_pud_init(pud, __pa(start), |
| __pa(end), page_size_mask); |
| continue; |
| } |
| |
| pud = alloc_low_page(); |
| last_map_addr = phys_pud_init(pud, __pa(start), __pa(end), |
| page_size_mask); |
| |
| spin_lock(&init_mm.page_table_lock); |
| pgd_populate(&init_mm, pgd, pud); |
| spin_unlock(&init_mm.page_table_lock); |
| pgd_changed = true; |
| } |
| |
| if (pgd_changed) |
| sync_global_pgds(addr, end - 1); |
| |
| __flush_tlb_all(); |
| |
| return last_map_addr; |
| } |
| |
| #ifndef CONFIG_NUMA |
| void __init initmem_init(void) |
| { |
| memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0); |
| } |
| #endif |
| |
| void __init paging_init(void) |
| { |
| sparse_memory_present_with_active_regions(MAX_NUMNODES); |
| sparse_init(); |
| |
| /* |
| * clear the default setting with node 0 |
| * note: don't use nodes_clear here, that is really clearing when |
| * numa support is not compiled in, and later node_set_state |
| * will not set it back. |
| */ |
| node_clear_state(0, N_MEMORY); |
| if (N_MEMORY != N_NORMAL_MEMORY) |
| node_clear_state(0, N_NORMAL_MEMORY); |
| |
| zone_sizes_init(); |
| } |
| |
| /* |
| * Memory hotplug specific functions |
| */ |
| #ifdef CONFIG_MEMORY_HOTPLUG |
| /* |
| * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need |
| * updating. |
| */ |
| static void update_end_of_memory_vars(u64 start, u64 size) |
| { |
| unsigned long end_pfn = PFN_UP(start + size); |
| |
| if (end_pfn > max_pfn) { |
| max_pfn = end_pfn; |
| max_low_pfn = end_pfn; |
| high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; |
| } |
| } |
| |
| /* |
| * Memory is added always to NORMAL zone. This means you will never get |
| * additional DMA/DMA32 memory. |
| */ |
| int arch_add_memory(int nid, u64 start, u64 size) |
| { |
| struct pglist_data *pgdat = NODE_DATA(nid); |
| struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
| unsigned long start_pfn = start >> PAGE_SHIFT; |
| unsigned long nr_pages = size >> PAGE_SHIFT; |
| int ret; |
| |
| init_memory_mapping(start, start + size); |
| |
| ret = __add_pages(nid, zone, start_pfn, nr_pages); |
| WARN_ON_ONCE(ret); |
| |
| /* update max_pfn, max_low_pfn and high_memory */ |
| update_end_of_memory_vars(start, size); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(arch_add_memory); |
| |
| #define PAGE_INUSE 0xFD |
| |
| static void __meminit free_pagetable(struct page *page, int order) |
| { |
| unsigned long magic; |
| unsigned int nr_pages = 1 << order; |
| |
| /* bootmem page has reserved flag */ |
| if (PageReserved(page)) { |
| __ClearPageReserved(page); |
| |
| magic = (unsigned long)page->lru.next; |
| if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) { |
| while (nr_pages--) |
| put_page_bootmem(page++); |
| } else |
| while (nr_pages--) |
| free_reserved_page(page++); |
| } else |
| free_pages((unsigned long)page_address(page), order); |
| } |
| |
| static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd) |
| { |
| pte_t *pte; |
| int i; |
| |
| for (i = 0; i < PTRS_PER_PTE; i++) { |
| pte = pte_start + i; |
| if (pte_val(*pte)) |
| return; |
| } |
| |
| /* free a pte talbe */ |
| free_pagetable(pmd_page(*pmd), 0); |
| spin_lock(&init_mm.page_table_lock); |
| pmd_clear(pmd); |
| spin_unlock(&init_mm.page_table_lock); |
| } |
| |
| static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud) |
| { |
| pmd_t *pmd; |
| int i; |
| |
| for (i = 0; i < PTRS_PER_PMD; i++) { |
| pmd = pmd_start + i; |
| if (pmd_val(*pmd)) |
| return; |
| } |
| |
| /* free a pmd talbe */ |
| free_pagetable(pud_page(*pud), 0); |
| spin_lock(&init_mm.page_table_lock); |
| pud_clear(pud); |
| spin_unlock(&init_mm.page_table_lock); |
| } |
| |
| /* Return true if pgd is changed, otherwise return false. */ |
| static bool __meminit free_pud_table(pud_t *pud_start, pgd_t *pgd) |
| { |
| pud_t *pud; |
| int i; |
| |
| for (i = 0; i < PTRS_PER_PUD; i++) { |
| pud = pud_start + i; |
| if (pud_val(*pud)) |
| return false; |
| } |
| |
| /* free a pud table */ |
| free_pagetable(pgd_page(*pgd), 0); |
| spin_lock(&init_mm.page_table_lock); |
| pgd_clear(pgd); |
| spin_unlock(&init_mm.page_table_lock); |
| |
| return true; |
| } |
| |
| static void __meminit |
| remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end, |
| bool direct) |
| { |
| unsigned long next, pages = 0; |
| pte_t *pte; |
| void *page_addr; |
| phys_addr_t phys_addr; |
| |
| pte = pte_start + pte_index(addr); |
| for (; addr < end; addr = next, pte++) { |
| next = (addr + PAGE_SIZE) & PAGE_MASK; |
| if (next > end) |
| next = end; |
| |
| if (!pte_present(*pte)) |
| continue; |
| |
| /* |
| * We mapped [0,1G) memory as identity mapping when |
| * initializing, in arch/x86/kernel/head_64.S. These |
| * pagetables cannot be removed. |
| */ |
| phys_addr = pte_val(*pte) + (addr & PAGE_MASK); |
| if (phys_addr < (phys_addr_t)0x40000000) |
| return; |
| |
| if (IS_ALIGNED(addr, PAGE_SIZE) && |
| IS_ALIGNED(next, PAGE_SIZE)) { |
| /* |
| * Do not free direct mapping pages since they were |
| * freed when offlining, or simplely not in use. |
| */ |
| if (!direct) |
| free_pagetable(pte_page(*pte), 0); |
| |
| spin_lock(&init_mm.page_table_lock); |
| pte_clear(&init_mm, addr, pte); |
| spin_unlock(&init_mm.page_table_lock); |
| |
| /* For non-direct mapping, pages means nothing. */ |
| pages++; |
| } else { |
| /* |
| * If we are here, we are freeing vmemmap pages since |
| * direct mapped memory ranges to be freed are aligned. |
| * |
| * If we are not removing the whole page, it means |
| * other page structs in this page are being used and |
| * we canot remove them. So fill the unused page_structs |
| * with 0xFD, and remove the page when it is wholly |
| * filled with 0xFD. |
| */ |
| memset((void *)addr, PAGE_INUSE, next - addr); |
| |
| page_addr = page_address(pte_page(*pte)); |
| if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) { |
| free_pagetable(pte_page(*pte), 0); |
| |
| spin_lock(&init_mm.page_table_lock); |
| pte_clear(&init_mm, addr, pte); |
| spin_unlock(&init_mm.page_table_lock); |
| } |
| } |
| } |
| |
| /* Call free_pte_table() in remove_pmd_table(). */ |
| flush_tlb_all(); |
| if (direct) |
| update_page_count(PG_LEVEL_4K, -pages); |
| } |
| |
| static void __meminit |
| remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end, |
| bool direct) |
| { |
| unsigned long next, pages = 0; |
| pte_t *pte_base; |
| pmd_t *pmd; |
| void *page_addr; |
| |
| pmd = pmd_start + pmd_index(addr); |
| for (; addr < end; addr = next, pmd++) { |
| next = pmd_addr_end(addr, end); |
| |
| if (!pmd_present(*pmd)) |
| continue; |
| |
| if (pmd_large(*pmd)) { |
| if (IS_ALIGNED(addr, PMD_SIZE) && |
| IS_ALIGNED(next, PMD_SIZE)) { |
| if (!direct) |
| free_pagetable(pmd_page(*pmd), |
| get_order(PMD_SIZE)); |
| |
| spin_lock(&init_mm.page_table_lock); |
| pmd_clear(pmd); |
| spin_unlock(&init_mm.page_table_lock); |
| pages++; |
| } else { |
| /* If here, we are freeing vmemmap pages. */ |
| memset((void *)addr, PAGE_INUSE, next - addr); |
| |
| page_addr = page_address(pmd_page(*pmd)); |
| if (!memchr_inv(page_addr, PAGE_INUSE, |
| PMD_SIZE)) { |
| free_pagetable(pmd_page(*pmd), |
| get_order(PMD_SIZE)); |
| |
| spin_lock(&init_mm.page_table_lock); |
| pmd_clear(pmd); |
| spin_unlock(&init_mm.page_table_lock); |
| } |
| } |
| |
| continue; |
| } |
| |
| pte_base = (pte_t *)pmd_page_vaddr(*pmd); |
| remove_pte_table(pte_base, addr, next, direct); |
| free_pte_table(pte_base, pmd); |
| } |
| |
| /* Call free_pmd_table() in remove_pud_table(). */ |
| if (direct) |
| update_page_count(PG_LEVEL_2M, -pages); |
| } |
| |
| static void __meminit |
| remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end, |
| bool direct) |
| { |
| unsigned long next, pages = 0; |
| pmd_t *pmd_base; |
| pud_t *pud; |
| void *page_addr; |
| |
| pud = pud_start + pud_index(addr); |
| for (; addr < end; addr = next, pud++) { |
| next = pud_addr_end(addr, end); |
| |
| if (!pud_present(*pud)) |
| continue; |
| |
| if (pud_large(*pud)) { |
| if (IS_ALIGNED(addr, PUD_SIZE) && |
| IS_ALIGNED(next, PUD_SIZE)) { |
| if (!direct) |
| free_pagetable(pud_page(*pud), |
| get_order(PUD_SIZE)); |
| |
| spin_lock(&init_mm.page_table_lock); |
| pud_clear(pud); |
| spin_unlock(&init_mm.page_table_lock); |
| pages++; |
| } else { |
| /* If here, we are freeing vmemmap pages. */ |
| memset((void *)addr, PAGE_INUSE, next - addr); |
| |
| page_addr = page_address(pud_page(*pud)); |
| if (!memchr_inv(page_addr, PAGE_INUSE, |
| PUD_SIZE)) { |
| free_pagetable(pud_page(*pud), |
| get_order(PUD_SIZE)); |
| |
| spin_lock(&init_mm.page_table_lock); |
| pud_clear(pud); |
| spin_unlock(&init_mm.page_table_lock); |
| } |
| } |
| |
| continue; |
| } |
| |
| pmd_base = (pmd_t *)pud_page_vaddr(*pud); |
| remove_pmd_table(pmd_base, addr, next, direct); |
| free_pmd_table(pmd_base, pud); |
| } |
| |
| if (direct) |
| update_page_count(PG_LEVEL_1G, -pages); |
| } |
| |
| /* start and end are both virtual address. */ |
| static void __meminit |
| remove_pagetable(unsigned long start, unsigned long end, bool direct) |
| { |
| unsigned long next; |
| pgd_t *pgd; |
| pud_t *pud; |
| bool pgd_changed = false; |
| |
| for (; start < end; start = next) { |
| next = pgd_addr_end(start, end); |
| |
| pgd = pgd_offset_k(start); |
| if (!pgd_present(*pgd)) |
| continue; |
| |
| pud = (pud_t *)pgd_page_vaddr(*pgd); |
| remove_pud_table(pud, start, next, direct); |
| if (free_pud_table(pud, pgd)) |
| pgd_changed = true; |
| } |
| |
| if (pgd_changed) |
| sync_global_pgds(start, end - 1); |
| |
| flush_tlb_all(); |
| } |
| |
| void __ref vmemmap_free(unsigned long start, unsigned long end) |
| { |
| remove_pagetable(start, end, false); |
| } |
| |
| #ifdef CONFIG_MEMORY_HOTREMOVE |
| static void __meminit |
| kernel_physical_mapping_remove(unsigned long start, unsigned long end) |
| { |
| start = (unsigned long)__va(start); |
| end = (unsigned long)__va(end); |
| |
| remove_pagetable(start, end, true); |
| } |
| |
| int __ref arch_remove_memory(u64 start, u64 size) |
| { |
| unsigned long start_pfn = start >> PAGE_SHIFT; |
| unsigned long nr_pages = size >> PAGE_SHIFT; |
| struct zone *zone; |
| int ret; |
| |
| zone = page_zone(pfn_to_page(start_pfn)); |
| kernel_physical_mapping_remove(start, start + size); |
| ret = __remove_pages(zone, start_pfn, nr_pages); |
| WARN_ON_ONCE(ret); |
| |
| return ret; |
| } |
| #endif |
| #endif /* CONFIG_MEMORY_HOTPLUG */ |
| |
| static struct kcore_list kcore_vsyscall; |
| |
| static void __init register_page_bootmem_info(void) |
| { |
| #ifdef CONFIG_NUMA |
| int i; |
| |
| for_each_online_node(i) |
| register_page_bootmem_info_node(NODE_DATA(i)); |
| #endif |
| } |
| |
| void __init mem_init(void) |
| { |
| pci_iommu_alloc(); |
| |
| /* clear_bss() already clear the empty_zero_page */ |
| |
| register_page_bootmem_info(); |
| |
| /* this will put all memory onto the freelists */ |
| free_all_bootmem(); |
| after_bootmem = 1; |
| |
| /* Register memory areas for /proc/kcore */ |
| kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
| VSYSCALL_END - VSYSCALL_START, KCORE_OTHER); |
| |
| mem_init_print_info(NULL); |
| } |
| |
| #ifdef CONFIG_DEBUG_RODATA |
| const int rodata_test_data = 0xC3; |
| EXPORT_SYMBOL_GPL(rodata_test_data); |
| |
| int kernel_set_to_readonly; |
| |
| void set_kernel_text_rw(void) |
| { |
| unsigned long start = PFN_ALIGN(_text); |
| unsigned long end = PFN_ALIGN(__stop___ex_table); |
| |
| if (!kernel_set_to_readonly) |
| return; |
| |
| pr_debug("Set kernel text: %lx - %lx for read write\n", |
| start, end); |
| |
| /* |
| * Make the kernel identity mapping for text RW. Kernel text |
| * mapping will always be RO. Refer to the comment in |
| * static_protections() in pageattr.c |
| */ |
| set_memory_rw(start, (end - start) >> PAGE_SHIFT); |
| } |
| |
| void set_kernel_text_ro(void) |
| { |
| unsigned long start = PFN_ALIGN(_text); |
| unsigned long end = PFN_ALIGN(__stop___ex_table); |
| |
| if (!kernel_set_to_readonly) |
| return; |
| |
| pr_debug("Set kernel text: %lx - %lx for read only\n", |
| start, end); |
| |
| /* |
| * Set the kernel identity mapping for text RO. |
| */ |
| set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
| } |
| |
| void mark_rodata_ro(void) |
| { |
| unsigned long start = PFN_ALIGN(_text); |
| unsigned long rodata_start = PFN_ALIGN(__start_rodata); |
| unsigned long end = (unsigned long) &__end_rodata_hpage_align; |
| unsigned long text_end = PFN_ALIGN(&__stop___ex_table); |
| unsigned long rodata_end = PFN_ALIGN(&__end_rodata); |
| unsigned long all_end = PFN_ALIGN(&_end); |
| |
| printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
| (end - start) >> 10); |
| set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
| |
| kernel_set_to_readonly = 1; |
| |
| /* |
| * The rodata/data/bss/brk section (but not the kernel text!) |
| * should also be not-executable. |
| */ |
| set_memory_nx(rodata_start, (all_end - rodata_start) >> PAGE_SHIFT); |
| |
| rodata_test(); |
| |
| #ifdef CONFIG_CPA_DEBUG |
| printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
| set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
| |
| printk(KERN_INFO "Testing CPA: again\n"); |
| set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
| #endif |
| |
| free_init_pages("unused kernel", |
| (unsigned long) __va(__pa_symbol(text_end)), |
| (unsigned long) __va(__pa_symbol(rodata_start))); |
| free_init_pages("unused kernel", |
| (unsigned long) __va(__pa_symbol(rodata_end)), |
| (unsigned long) __va(__pa_symbol(_sdata))); |
| } |
| |
| #endif |
| |
| int kern_addr_valid(unsigned long addr) |
| { |
| unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
| pgd_t *pgd; |
| pud_t *pud; |
| pmd_t *pmd; |
| pte_t *pte; |
| |
| if (above != 0 && above != -1UL) |
| return 0; |
| |
| pgd = pgd_offset_k(addr); |
| if (pgd_none(*pgd)) |
| return 0; |
| |
| pud = pud_offset(pgd, addr); |
| if (pud_none(*pud)) |
| return 0; |
| |
| if (pud_large(*pud)) |
| return pfn_valid(pud_pfn(*pud)); |
| |
| pmd = pmd_offset(pud, addr); |
| if (pmd_none(*pmd)) |
| return 0; |
| |
| if (pmd_large(*pmd)) |
| return pfn_valid(pmd_pfn(*pmd)); |
| |
| pte = pte_offset_kernel(pmd, addr); |
| if (pte_none(*pte)) |
| return 0; |
| |
| return pfn_valid(pte_pfn(*pte)); |
| } |
| |
| /* |
| * A pseudo VMA to allow ptrace access for the vsyscall page. This only |
| * covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
| * not need special handling anymore: |
| */ |
| static struct vm_area_struct gate_vma = { |
| .vm_start = VSYSCALL_START, |
| .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), |
| .vm_page_prot = PAGE_READONLY_EXEC, |
| .vm_flags = VM_READ | VM_EXEC |
| }; |
| |
| struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
| { |
| #ifdef CONFIG_IA32_EMULATION |
| if (!mm || mm->context.ia32_compat) |
| return NULL; |
| #endif |
| return &gate_vma; |
| } |
| |
| int in_gate_area(struct mm_struct *mm, unsigned long addr) |
| { |
| struct vm_area_struct *vma = get_gate_vma(mm); |
| |
| if (!vma) |
| return 0; |
| |
| return (addr >= vma->vm_start) && (addr < vma->vm_end); |
| } |
| |
| /* |
| * Use this when you have no reliable mm, typically from interrupt |
| * context. It is less reliable than using a task's mm and may give |
| * false positives. |
| */ |
| int in_gate_area_no_mm(unsigned long addr) |
| { |
| return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
| } |
| |
| const char *arch_vma_name(struct vm_area_struct *vma) |
| { |
| if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) |
| return "[vdso]"; |
| if (vma == &gate_vma) |
| return "[vsyscall]"; |
| return NULL; |
| } |
| |
| #ifdef CONFIG_X86_UV |
| unsigned long memory_block_size_bytes(void) |
| { |
| if (is_uv_system()) { |
| printk(KERN_INFO "UV: memory block size 2GB\n"); |
| return 2UL * 1024 * 1024 * 1024; |
| } |
| return MIN_MEMORY_BLOCK_SIZE; |
| } |
| #endif |
| |
| #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| /* |
| * Initialise the sparsemem vmemmap using huge-pages at the PMD level. |
| */ |
| static long __meminitdata addr_start, addr_end; |
| static void __meminitdata *p_start, *p_end; |
| static int __meminitdata node_start; |
| |
| static int __meminit vmemmap_populate_hugepages(unsigned long start, |
| unsigned long end, int node) |
| { |
| unsigned long addr; |
| unsigned long next; |
| pgd_t *pgd; |
| pud_t *pud; |
| pmd_t *pmd; |
| |
| for (addr = start; addr < end; addr = next) { |
| next = pmd_addr_end(addr, end); |
| |
| pgd = vmemmap_pgd_populate(addr, node); |
| if (!pgd) |
| return -ENOMEM; |
| |
| pud = vmemmap_pud_populate(pgd, addr, node); |
| if (!pud) |
| return -ENOMEM; |
| |
| pmd = pmd_offset(pud, addr); |
| if (pmd_none(*pmd)) { |
| void *p; |
| |
| p = vmemmap_alloc_block_buf(PMD_SIZE, node); |
| if (p) { |
| pte_t entry; |
| |
| entry = pfn_pte(__pa(p) >> PAGE_SHIFT, |
| PAGE_KERNEL_LARGE); |
| set_pmd(pmd, __pmd(pte_val(entry))); |
| |
| /* check to see if we have contiguous blocks */ |
| if (p_end != p || node_start != node) { |
| if (p_start) |
| printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
| addr_start, addr_end-1, p_start, p_end-1, node_start); |
| addr_start = addr; |
| node_start = node; |
| p_start = p; |
| } |
| |
| addr_end = addr + PMD_SIZE; |
| p_end = p + PMD_SIZE; |
| continue; |
| } |
| } else if (pmd_large(*pmd)) { |
| vmemmap_verify((pte_t *)pmd, node, addr, next); |
| continue; |
| } |
| pr_warn_once("vmemmap: falling back to regular page backing\n"); |
| if (vmemmap_populate_basepages(addr, next, node)) |
| return -ENOMEM; |
| } |
| return 0; |
| } |
| |
| int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
| { |
| int err; |
| |
| if (cpu_has_pse) |
| err = vmemmap_populate_hugepages(start, end, node); |
| else |
| err = vmemmap_populate_basepages(start, end, node); |
| if (!err) |
| sync_global_pgds(start, end - 1); |
| return err; |
| } |
| |
| #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE) |
| void register_page_bootmem_memmap(unsigned long section_nr, |
| struct page *start_page, unsigned long size) |
| { |
| unsigned long addr = (unsigned long)start_page; |
| unsigned long end = (unsigned long)(start_page + size); |
| unsigned long next; |
| pgd_t *pgd; |
| pud_t *pud; |
| pmd_t *pmd; |
| unsigned int nr_pages; |
| struct page *page; |
| |
| for (; addr < end; addr = next) { |
| pte_t *pte = NULL; |
| |
| pgd = pgd_offset_k(addr); |
| if (pgd_none(*pgd)) { |
| next = (addr + PAGE_SIZE) & PAGE_MASK; |
| continue; |
| } |
| get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO); |
| |
| pud = pud_offset(pgd, addr); |
| if (pud_none(*pud)) { |
| next = (addr + PAGE_SIZE) & PAGE_MASK; |
| continue; |
| } |
| get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO); |
| |
| if (!cpu_has_pse) { |
| next = (addr + PAGE_SIZE) & PAGE_MASK; |
| pmd = pmd_offset(pud, addr); |
| if (pmd_none(*pmd)) |
| continue; |
| get_page_bootmem(section_nr, pmd_page(*pmd), |
| MIX_SECTION_INFO); |
| |
| pte = pte_offset_kernel(pmd, addr); |
| if (pte_none(*pte)) |
| continue; |
| get_page_bootmem(section_nr, pte_page(*pte), |
| SECTION_INFO); |
| } else { |
| next = pmd_addr_end(addr, end); |
| |
| pmd = pmd_offset(pud, addr); |
| if (pmd_none(*pmd)) |
| continue; |
| |
| nr_pages = 1 << (get_order(PMD_SIZE)); |
| page = pmd_page(*pmd); |
| while (nr_pages--) |
| get_page_bootmem(section_nr, page++, |
| SECTION_INFO); |
| } |
| } |
| } |
| #endif |
| |
| void __meminit vmemmap_populate_print_last(void) |
| { |
| if (p_start) { |
| printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
| addr_start, addr_end-1, p_start, p_end-1, node_start); |
| p_start = NULL; |
| p_end = NULL; |
| node_start = 0; |
| } |
| } |
| #endif |
