diff options
| -rw-r--r-- | arch/x86/mm/init_64.c | 301 |
1 files changed, 175 insertions, 126 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 8a7b725ce3c7..bb732bb79b4a 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -47,10 +47,10 @@ #include <asm/numa.h> #ifndef Dprintk -#define Dprintk(x...) +# define Dprintk(x...) #endif -const struct dma_mapping_ops* dma_ops; +const struct dma_mapping_ops *dma_ops; EXPORT_SYMBOL(dma_ops); static unsigned long dma_reserve __initdata; @@ -67,22 +67,26 @@ void show_mem(void) { long i, total = 0, reserved = 0; long shared = 0, cached = 0; - pg_data_t *pgdat; struct page *page; + pg_data_t *pgdat; printk(KERN_INFO "Mem-info:\n"); show_free_areas(); - printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); + printk(KERN_INFO "Free swap: %6ldkB\n", + nr_swap_pages << (PAGE_SHIFT-10)); for_each_online_pgdat(pgdat) { - for (i = 0; i < pgdat->node_spanned_pages; ++i) { - /* this loop can take a while with 256 GB and 4k pages - so update the NMI watchdog */ - if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) { + for (i = 0; i < pgdat->node_spanned_pages; ++i) { + /* + * This loop can take a while with 256 GB and + * 4k pages so defer the NMI watchdog: + */ + if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) touch_nmi_watchdog(); - } + if (!pfn_valid(pgdat->node_start_pfn + i)) continue; + page = pfn_to_page(pgdat->node_start_pfn + i); total++; if (PageReserved(page)) @@ -91,32 +95,37 @@ void show_mem(void) cached++; else if (page_count(page)) shared += page_count(page) - 1; - } + } } - printk(KERN_INFO "%lu pages of RAM\n", total); - printk(KERN_INFO "%lu reserved pages\n",reserved); - printk(KERN_INFO "%lu pages shared\n",shared); - printk(KERN_INFO "%lu pages swap cached\n",cached); + printk(KERN_INFO "%lu pages of RAM\n", total); + printk(KERN_INFO "%lu reserved pages\n", reserved); + printk(KERN_INFO "%lu pages shared\n", shared); + printk(KERN_INFO "%lu pages swap cached\n", cached); } int after_bootmem; static __init void *spp_getpage(void) -{ +{ void *ptr; + if (after_bootmem) - ptr = (void *) get_zeroed_page(GFP_ATOMIC); + ptr = (void *) get_zeroed_page(GFP_ATOMIC); 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":""); + + if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { + panic("set_pte_phys: cannot allocate page data %s\n", + after_bootmem ? "after bootmem" : ""); + } Dprintk("spp_getpage %p\n", ptr); + return ptr; -} +} -static __init void set_pte_phys(unsigned long vaddr, - unsigned long phys, pgprot_t prot) +static __init void +set_pte_phys(unsigned long vaddr, unsigned long phys, pgprot_t prot) { pgd_t *pgd; pud_t *pud; @@ -132,10 +141,11 @@ static __init void set_pte_phys(unsigned long vaddr, } pud = pud_offset(pgd, vaddr); if (pud_none(*pud)) { - pmd = (pmd_t *) spp_getpage(); + pmd = (pmd_t *) spp_getpage(); set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); if (pmd != pmd_offset(pud, 0)) { - printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); + printk("PAGETABLE BUG #01! %p <-> %p\n", + pmd, pmd_offset(pud, 0)); return; } } @@ -164,8 +174,8 @@ static __init void set_pte_phys(unsigned long vaddr, } /* NOTE: this is meant to be run only at boot */ -void __init -__set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) +void __init +__set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) { unsigned long address = __fix_to_virt(idx); @@ -180,18 +190,19 @@ static unsigned long __initdata table_start; static unsigned long __meminitdata table_end; static __meminit void *alloc_low_page(unsigned long *phys) -{ +{ unsigned long pfn = table_end++; void *adr; if (after_bootmem) { adr = (void *)get_zeroed_page(GFP_ATOMIC); *phys = __pa(adr); + return adr; } - if (pfn >= end_pfn) - panic("alloc_low_page: ran out of memory"); + if (pfn >= end_pfn) + panic("alloc_low_page: ran out of memory"); adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); memset(adr, 0, PAGE_SIZE); @@ -200,44 +211,49 @@ static __meminit void *alloc_low_page(unsigned long *phys) } static __meminit void unmap_low_page(void *adr) -{ - +{ if (after_bootmem) return; early_iounmap(adr, PAGE_SIZE); -} +} /* Must run before zap_low_mappings */ __meminit void *early_ioremap(unsigned long addr, unsigned long size) { - unsigned long vaddr; pmd_t *pmd, *last_pmd; + unsigned long vaddr; int i, pmds; pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; vaddr = __START_KERNEL_map; pmd = level2_kernel_pgt; last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1; + for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) { for (i = 0; i < pmds; i++) { if (pmd_present(pmd[i])) - goto next; + goto continue_outer_loop; } vaddr += addr & ~PMD_MASK; addr &= PMD_MASK; + for (i = 0; i < pmds; i++, addr += PMD_SIZE) set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC)); __flush_tlb_all(); + return (void *)vaddr; - next: +continue_outer_loop: ; } printk("early_ioremap(0x%lx, %lu) failed\n", addr, size); + return NULL; } -/* To avoid virtual aliases later */ +/* + * To avoid virtual aliases later: + */ __meminit void early_iounmap(void *addr, unsigned long size) { unsigned long vaddr; @@ -247,8 +263,10 @@ __meminit void early_iounmap(void *addr, unsigned long size) vaddr = (unsigned long)addr; pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; pmd = level2_kernel_pgt + pmd_index(vaddr); + for (i = 0; i < pmds; i++) pmd_clear(pmd + i); + __flush_tlb_all(); } @@ -262,9 +280,10 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end) pmd_t *pmd = pmd_page + pmd_index(address); if (address >= end) { - if (!after_bootmem) + if (!after_bootmem) { for (; i < PTRS_PER_PMD; i++, pmd++) set_pmd(pmd, __pmd(0)); + } break; } @@ -280,19 +299,19 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end) static void __meminit phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) { - pmd_t *pmd = pmd_offset(pud,0); + pmd_t *pmd = pmd_offset(pud, 0); spin_lock(&init_mm.page_table_lock); phys_pmd_init(pmd, address, end); spin_unlock(&init_mm.page_table_lock); __flush_tlb_all(); } -static void __meminit phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end) -{ +static void __meminit +phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end) +{ int i = pud_index(addr); - - for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE ) { + for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { unsigned long pmd_phys; pud_t *pud = pud_page + pud_index(addr); pmd_t *pmd; @@ -300,10 +319,11 @@ static void __meminit phys_pud_init(pud_t *pud_page, unsigned long addr, unsigne if (addr >= end) break; - if (!after_bootmem && !e820_any_mapped(addr,addr+PUD_SIZE,0)) { - set_pud(pud, __pud(0)); + if (!after_bootmem && + !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { + set_pud(pud, __pud(0)); continue; - } + } if (pud_val(*pud)) { phys_pmd_update(pud, addr, end); @@ -311,14 +331,16 @@ static void __meminit phys_pud_init(pud_t *pud_page, unsigned long addr, unsigne } pmd = alloc_low_page(&pmd_phys); + spin_lock(&init_mm.page_table_lock); set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); phys_pmd_init(pmd, addr, end); spin_unlock(&init_mm.page_table_lock); + unmap_low_page(pmd); } __flush_tlb_all(); -} +} static void __init find_early_table_space(unsigned long end) { @@ -329,11 +351,13 @@ static void __init find_early_table_space(unsigned long end) tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + round_up(pmds * sizeof(pmd_t), PAGE_SIZE); - /* RED-PEN putting page tables only on node 0 could - cause a hotspot and fill up ZONE_DMA. The page tables - need roughly 0.5KB per GB. */ - start = 0x8000; - table_start = find_e820_area(start, end, tables); + /* + * RED-PEN putting page tables only on node 0 could + * cause a hotspot and fill up ZONE_DMA. The page tables + * need roughly 0.5KB per GB. + */ + start = 0x8000; + table_start = find_e820_area(start, end, tables); if (table_start == -1UL) panic("Cannot find space for the kernel page tables"); @@ -345,20 +369,23 @@ static void __init find_early_table_space(unsigned long end) (table_start << PAGE_SHIFT) + tables); } -/* Setup the direct mapping of the physical memory at PAGE_OFFSET. - This runs before bootmem is initialized and gets pages directly from the - physical memory. To access them they are temporarily mapped. */ +/* + * Setup the direct mapping of the physical memory at PAGE_OFFSET. + * This runs before bootmem is initialized and gets pages directly from + * the physical memory. To access them they are temporarily mapped. + */ void __init_refok init_memory_mapping(unsigned long start, unsigned long end) -{ - unsigned long next; +{ + unsigned long next; Dprintk("init_memory_mapping\n"); - /* + /* * Find space for the kernel direct mapping tables. - * Later we should allocate these tables in the local node of the memory - * mapped. Unfortunately this is done currently before the nodes are - * discovered. + * + * Later we should allocate these tables in the local node of the + * memory mapped. Unfortunately this is done currently before the + * nodes are discovered. */ if (!after_bootmem) find_early_table_space(end); @@ -367,8 +394,8 @@ void __init_refok init_memory_mapping(unsigned long start, unsigned long end) end = (unsigned long)__va(end); for (; start < end; start = next) { - unsigned long pud_phys; pgd_t *pgd = pgd_offset_k(start); + unsigned long pud_phys; pud_t *pud; if (after_bootmem) @@ -377,13 +404,13 @@ void __init_refok init_memory_mapping(unsigned long start, unsigned long end) pud = alloc_low_page(&pud_phys); next = start + PGDIR_SIZE; - if (next > end) - next = end; + if (next > end) + next = end; phys_pud_init(pud, __pa(start), __pa(next)); if (!after_bootmem) set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); unmap_low_page(pud); - } + } if (!after_bootmem) mmu_cr4_features = read_cr4(); @@ -396,6 +423,7 @@ void __init_refok init_memory_mapping(unsigned long start, unsigned long end) void __init paging_init(void) { unsigned long max_zone_pfns[MAX_NR_ZONES]; + memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; @@ -407,39 +435,48 @@ void __init paging_init(void) } #endif -/* Unmap a kernel mapping if it exists. This is useful to avoid prefetches - from the CPU leading to inconsistent cache lines. address and size - must be aligned to 2MB boundaries. - Does nothing when the mapping doesn't exist. */ -void __init clear_kernel_mapping(unsigned long address, unsigned long size) +/* + * Unmap a kernel mapping if it exists. This is useful to avoid + * prefetches from the CPU leading to inconsistent cache lines. + * address and size must be aligned to 2MB boundaries. + * Does nothing when the mapping doesn't exist. + */ +void __init clear_kernel_mapping(unsigned long address, unsigned long size) { unsigned long end = address + size; BUG_ON(address & ~LARGE_PAGE_MASK); - BUG_ON(size & ~LARGE_PAGE_MASK); - - for (; address < end; address += LARGE_PAGE_SIZE) { + BUG_ON(size & ~LARGE_PAGE_MASK); + + for (; address < end; address += LARGE_PAGE_SIZE) { pgd_t *pgd = pgd_offset_k(address); pud_t *pud; pmd_t *pmd; + if (pgd_none(*pgd)) continue; + pud = pud_offset(pgd, address); if (pud_none(*pud)) - continue; + continue; + pmd = pmd_offset(pud, address); if (!pmd || pmd_none(*pmd)) - continue; - if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { - /* Could handle this, but it should not happen currently. */ - printk(KERN_ERR - "clear_kernel_mapping: mapping has been split. will leak memory\n"); - pmd_ERROR(*pmd); + continue; + + if (!(pmd_val(*pmd) & _PAGE_PSE)) { + /* + * Could handle this, but it should not happen + * currently: + */ + printk(KERN_ERR "clear_kernel_mapping: " + "mapping has been split. will leak memory\n"); + pmd_ERROR(*pmd); } - set_pmd(pmd, __pmd(0)); + set_pmd(pmd, __pmd(0)); } __flush_tlb_all(); -} +} /* * Memory hotplug specific functions @@ -466,16 +503,13 @@ int arch_add_memory(int nid, u64 start, u64 size) unsigned long nr_pages = size >> PAGE_SHIFT; int ret; - init_memory_mapping(start, (start + size -1)); + init_memory_mapping(start, start + size-1); ret = __add_pages(zone, start_pfn, nr_pages); if (ret) - goto error; + printk("%s: Problem encountered in __add_pages!\n", __func__); return ret; -error: - printk("%s: Problem encountered in __add_pages!\n", __func__); - return ret; } EXPORT_SYMBOL_GPL(arch_add_memory); @@ -489,8 +523,8 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); #endif /* CONFIG_MEMORY_HOTPLUG */ -static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, - kcore_vsyscall; +static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, + kcore_modules, kcore_vsyscall; void __init mem_init(void) { @@ -518,7 +552,6 @@ void __init mem_init(void) #endif reservedpages = end_pfn - totalram_pages - absent_pages_in_range(0, end_pfn); - after_bootmem = 1; codesize = (unsigned long) &_etext - (unsigned long) &_text; @@ -526,15 +559,16 @@ void __init mem_init(void) initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; /* Register memory areas for /proc/kcore */ - kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); - kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, + kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); + kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); kclist_add(&kcore_kernel, &_stext, _end - _stext); kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); - kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, + kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, VSYSCALL_END - VSYSCALL_START); - printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", + printk("Memory: %luk/%luk available (%ldk kernel code, " + "%ldk reserved, %ldk data, %ldk init)\n", (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), end_pfn << (PAGE_SHIFT-10), codesize >> 10, @@ -561,6 +595,7 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end) set_memory_np(begin, (end - begin) >> PAGE_SHIFT); #else printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); + for (addr = begin; addr < end; addr += PAGE_SIZE) { ClearPageReserved(virt_to_page(addr)); init_page_count(virt_to_page(addr)); @@ -596,7 +631,7 @@ void mark_rodata_ro(void) #ifdef CONFIG_KPROBES start = (unsigned long)__start_rodata; #endif - + end = (unsigned long)__end_rodata; start = (start + PAGE_SIZE - 1) & PAGE_MASK; end &= PAGE_MASK; @@ -627,17 +662,21 @@ void free_initrd_mem(unsigned long start, unsigned long end) } #endif -void __init reserve_bootmem_generic(unsigned long phys, unsigned len) -{ +void __init reserve_bootmem_generic(unsigned long phys, unsigned len) +{ #ifdef CONFIG_NUMA int nid = phys_to_nid(phys); #endif unsigned long pfn = phys >> PAGE_SHIFT; + if (pfn >= end_pfn) { - /* This can happen with kdump kernels when accessing firmware - tables. */ + /* + * This can happen with kdump kernels when accessing + * firmware tables: + */ if (pfn < end_pfn_map) return; + printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n", phys, len); return; @@ -645,9 +684,9 @@ void __init reserve_bootmem_generic(unsigned long phys, unsigned len) /* Should check here against the e820 map to avoid double free */ #ifdef CONFIG_NUMA - reserve_bootmem_node(NODE_DATA(nid), phys, len); -#else - reserve_bootmem(phys, len); + reserve_bootmem_node(NODE_DATA(nid), phys, len); +#else + reserve_bootmem(phys, len); #endif if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { dma_reserve += len / PAGE_SIZE; @@ -655,46 +694,49 @@ void __init reserve_bootmem_generic(unsigned long phys, unsigned len) } } -int kern_addr_valid(unsigned long addr) -{ +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; + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; if (above != 0 && above != -1UL) - return 0; - + return 0; + pgd = pgd_offset_k(addr); if (pgd_none(*pgd)) return 0; pud = pud_offset(pgd, addr); if (pud_none(*pud)) - return 0; + return 0; 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. */ - +/* + * 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_SHIFT), - .vm_page_prot = PAGE_READONLY_EXEC, - .vm_flags = VM_READ | VM_EXEC + .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 task_struct *tsk) @@ -709,14 +751,17 @@ struct vm_area_struct *get_gate_vma(struct task_struct *tsk) int in_gate_area(struct task_struct *task, unsigned long addr) { struct vm_area_struct *vma = get_gate_vma(task); + if (!vma) return 0; + return (addr >= vma->vm_start) && (addr < vma->vm_end); } -/* Use this when you have no reliable task/vma, typically from interrupt - * context. It is less reliable than using the task's vma and may give - * false positives. +/* + * Use this when you have no reliable task/vma, typically from interrupt + * context. It is less reliable than using the task's vma and may give + * false positives: */ int in_gate_area_no_task(unsigned long addr) { @@ -736,8 +781,8 @@ const char *arch_vma_name(struct vm_area_struct *vma) /* * Initialise the sparsemem vmemmap using huge-pages at the PMD level. */ -int __meminit vmemmap_populate(struct page *start_page, - unsigned long size, int node) +int __meminit +vmemmap_populate(struct page *start_page, unsigned long size, int node) { unsigned long addr = (unsigned long)start_page; unsigned long end = (unsigned long)(start_page + size); @@ -752,6 +797,7 @@ int __meminit vmemmap_populate(struct page *start_page, pgd = vmemmap_pgd_populate(addr, node); if (!pgd) return -ENOMEM; + pud = vmemmap_pud_populate(pgd, addr, node); if (!pud) return -ENOMEM; @@ -759,19 +805,22 @@ int __meminit vmemmap_populate(struct page *start_page, pmd = pmd_offset(pud, addr); if (pmd_none(*pmd)) { pte_t entry; - void *p = vmemmap_alloc_block(PMD_SIZE, node); + void *p; + + p = vmemmap_alloc_block(PMD_SIZE, node); if (!p) return -ENOMEM; - entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL_LARGE); + entry = pfn_pte(__pa(p) >> PAGE_SHIFT, + PAGE_KERNEL_LARGE); set_pmd(pmd, __pmd(pte_val(entry))); printk(KERN_DEBUG " [%lx-%lx] PMD ->%p on node %d\n", addr, addr + PMD_SIZE - 1, p, node); - } else + } else { vmemmap_verify((pte_t *)pmd, node, addr, next); + } } - return 0; } #endif |