| 1 | |
| 2 | |
| 3 | * Copyright (C) 1993 Linus Torvalds
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| 4 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
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| 5 | * SMP-safe vmalloc/vfree/ioremap, Tigran Aivazian <[email protected]>, May 2000
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| 6 | * Major rework to support vmap/vunmap, Christoph Hellwig, SGI, August 2002
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| 7 | * Numa awareness, Christoph Lameter, SGI, June 2005
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| 8 | * Improving global KVA allocator, Uladzislau Rezki, Sony, May 2019
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| 9 |
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| 10 |
|
| 11 | #include <linux/vmalloc.h>
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| 12 | #include <linux/mm.h>
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| 13 | #include <linux/module.h>
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| 14 | #include <linux/highmem.h>
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| 15 | #include <linux/sched/signal.h>
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| 16 | #include <linux/slab.h>
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| 17 | #include <linux/spinlock.h>
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| 18 | #include <linux/interrupt.h>
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| 19 | #include <linux/proc_fs.h>
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| 20 | #include <linux/seq_file.h>
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| 21 | #include <linux/set_memory.h>
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| 22 | #include <linux/debugobjects.h>
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| 23 | #include <linux/kallsyms.h>
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| 24 | #include <linux/list.h>
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| 25 | #include <linux/notifier.h>
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| 26 | #include <linux/rbtree.h>
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| 27 | #include <linux/xarray.h>
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| 28 | #include <linux/io.h>
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| 29 | #include <linux/rcupdate.h>
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| 30 | #include <linux/pfn.h>
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| 31 | #include <linux/kmemleak.h>
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| 32 | #include <linux/atomic.h>
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| 33 | #include <linux/compiler.h>
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| 34 | #include <linux/memcontrol.h>
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| 35 | #include <linux/llist.h>
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| 36 | #include <linux/bitops.h>
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| 37 | #include <linux/rbtree_augmented.h>
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| 38 | #include <linux/overflow.h>
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| 39 | #include <linux/pgtable.h>
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| 40 | #include <linux/uaccess.h>
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| 41 | #include <linux/hugetlb.h>
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| 42 | #include <linux/sched/mm.h>
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| 43 | #include <asm/tlbflush.h>
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| 44 | #include <asm/shmparam.h>
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| 45 |
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| 46 | #include "internal.h"
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| 47 | #include "pgalloc-track.h"
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| 48 |
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| 49 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
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| 50 | static unsigned int __ro_after_init ioremap_max_page_shift = BITS_PER_LONG - 1;
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| 51 |
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| 52 | static int __init set_nohugeiomap(char *str)
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| 53 | {
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| 54 | ioremap_max_page_shift = PAGE_SHIFT;
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| 55 | return 0;
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| 56 | }
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| 57 | early_param("nohugeiomap", set_nohugeiomap);
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| 58 | #else
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| 59 | static const unsigned int ioremap_max_page_shift = PAGE_SHIFT;
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| 60 | #endif
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| 61 |
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| 62 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
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| 63 | static bool __ro_after_init vmap_allow_huge = true;
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| 64 |
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| 65 | static int __init set_nohugevmalloc(char *str)
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| 66 | {
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| 67 | vmap_allow_huge = false;
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| 68 | return 0;
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| 69 | }
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| 70 | early_param("nohugevmalloc", set_nohugevmalloc);
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| 71 | #else
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| 72 | static const bool vmap_allow_huge = false;
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| 73 | #endif
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| 74 |
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| 75 | bool is_vmalloc_addr(const void *x)
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| 76 | {
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| 77 | unsigned long addr = (unsigned long)kasan_reset_tag(x);
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| 78 |
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| 79 | return addr >= VMALLOC_START && addr < VMALLOC_END;
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| 80 | }
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| 81 | EXPORT_SYMBOL(is_vmalloc_addr);
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| 82 |
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| 83 | struct vfree_deferred {
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| 84 | struct llist_head list;
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| 85 | struct work_struct wq;
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| 86 | };
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| 87 | static DEFINE_PER_CPU(struct vfree_deferred, vfree_deferred);
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| 88 |
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| 89 | static void __vunmap(const void *, int);
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| 90 |
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| 91 | static void free_work(struct work_struct *w)
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| 92 | {
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| 93 | struct vfree_deferred *p = container_of(w, struct vfree_deferred, wq);
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| 94 | struct llist_node *t, *llnode;
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| 95 |
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| 96 | llist_for_each_safe(llnode, t, llist_del_all(&p->list))
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| 97 | __vunmap((void *)llnode, 1);
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| 98 | }
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| 99 |
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| 100 |
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| 101 | static int vmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
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| 102 | phys_addr_t phys_addr, pgprot_t prot,
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| 103 | unsigned int max_page_shift, pgtbl_mod_mask *mask)
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| 104 | {
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| 105 | pte_t *pte;
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| 106 | u64 pfn;
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| 107 | unsigned long size = PAGE_SIZE;
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| 108 |
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| 109 | pfn = phys_addr >> PAGE_SHIFT;
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| 110 | pte = pte_alloc_kernel_track(pmd, addr, mask);
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| 111 | if (!pte)
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| 112 | return -ENOMEM;
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| 113 | do {
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| 114 | BUG_ON(!pte_none(*pte));
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| 115 |
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| 116 | #ifdef CONFIG_HUGETLB_PAGE
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| 117 | size = arch_vmap_pte_range_map_size(addr, end, pfn, max_page_shift);
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| 118 | if (size != PAGE_SIZE) {
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| 119 | pte_t entry = pfn_pte(pfn, prot);
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| 120 |
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| 121 | entry = arch_make_huge_pte(entry, ilog2(size), 0);
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| 122 | set_huge_pte_at(&init_mm, addr, pte, entry);
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| 123 | pfn += PFN_DOWN(size);
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| 124 | continue;
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| 125 | }
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| 126 | #endif
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| 127 | set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
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| 128 | pfn++;
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| 129 | } while (pte += PFN_DOWN(size), addr += size, addr != end);
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| 130 | *mask |= PGTBL_PTE_MODIFIED;
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| 131 | return 0;
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| 132 | }
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| 133 |
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| 134 | static int vmap_try_huge_pmd(pmd_t *pmd, unsigned long addr, unsigned long end,
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| 135 | phys_addr_t phys_addr, pgprot_t prot,
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| 136 | unsigned int max_page_shift)
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| 137 | {
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| 138 | if (max_page_shift < PMD_SHIFT)
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| 139 | return 0;
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| 140 |
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| 141 | if (!arch_vmap_pmd_supported(prot))
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| 142 | return 0;
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| 143 |
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| 144 | if ((end - addr) != PMD_SIZE)
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| 145 | return 0;
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| 146 |
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| 147 | if (!IS_ALIGNED(addr, PMD_SIZE))
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| 148 | return 0;
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| 149 |
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| 150 | if (!IS_ALIGNED(phys_addr, PMD_SIZE))
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| 151 | return 0;
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| 152 |
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| 153 | if (pmd_present(*pmd) && !pmd_free_pte_page(pmd, addr))
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| 154 | return 0;
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| 155 |
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| 156 | return pmd_set_huge(pmd, phys_addr, prot);
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| 157 | }
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| 158 |
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| 159 | static int vmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
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| 160 | phys_addr_t phys_addr, pgprot_t prot,
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| 161 | unsigned int max_page_shift, pgtbl_mod_mask *mask)
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| 162 | {
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| 163 | pmd_t *pmd;
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| 164 | unsigned long next;
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| 165 |
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| 166 | pmd = pmd_alloc_track(&init_mm, pud, addr, mask);
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| 167 | if (!pmd)
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| 168 | return -ENOMEM;
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| 169 | do {
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| 170 | next = pmd_addr_end(addr, end);
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| 171 |
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| 172 | if (vmap_try_huge_pmd(pmd, addr, next, phys_addr, prot,
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| 173 | max_page_shift)) {
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| 174 | *mask |= PGTBL_PMD_MODIFIED;
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| 175 | continue;
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| 176 | }
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| 177 |
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| 178 | if (vmap_pte_range(pmd, addr, next, phys_addr, prot, max_page_shift, mask))
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| 179 | return -ENOMEM;
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| 180 | } while (pmd++, phys_addr += (next - addr), addr = next, addr != end);
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| 181 | return 0;
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| 182 | }
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| 183 |
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| 184 | static int vmap_try_huge_pud(pud_t *pud, unsigned long addr, unsigned long end,
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| 185 | phys_addr_t phys_addr, pgprot_t prot,
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| 186 | unsigned int max_page_shift)
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| 187 | {
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| 188 | if (max_page_shift < PUD_SHIFT)
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| 189 | return 0;
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| 190 |
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| 191 | if (!arch_vmap_pud_supported(prot))
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| 192 | return 0;
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| 193 |
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| 194 | if ((end - addr) != PUD_SIZE)
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| 195 | return 0;
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| 196 |
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| 197 | if (!IS_ALIGNED(addr, PUD_SIZE))
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| 198 | return 0;
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| 199 |
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| 200 | if (!IS_ALIGNED(phys_addr, PUD_SIZE))
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| 201 | return 0;
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| 202 |
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| 203 | if (pud_present(*pud) && !pud_free_pmd_page(pud, addr))
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| 204 | return 0;
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| 205 |
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| 206 | return pud_set_huge(pud, phys_addr, prot);
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| 207 | }
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| 208 |
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| 209 | static int vmap_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
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| 210 | phys_addr_t phys_addr, pgprot_t prot,
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| 211 | unsigned int max_page_shift, pgtbl_mod_mask *mask)
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| 212 | {
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| 213 | pud_t *pud;
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| 214 | unsigned long next;
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| 215 |
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| 216 | pud = pud_alloc_track(&init_mm, p4d, addr, mask);
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| 217 | if (!pud)
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| 218 | return -ENOMEM;
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| 219 | do {
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| 220 | next = pud_addr_end(addr, end);
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| 221 |
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| 222 | if (vmap_try_huge_pud(pud, addr, next, phys_addr, prot,
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| 223 | max_page_shift)) {
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| 224 | *mask |= PGTBL_PUD_MODIFIED;
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| 225 | continue;
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| 226 | }
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| 227 |
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| 228 | if (vmap_pmd_range(pud, addr, next, phys_addr, prot,
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| 229 | max_page_shift, mask))
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| 230 | return -ENOMEM;
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| 231 | } while (pud++, phys_addr += (next - addr), addr = next, addr != end);
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| 232 | return 0;
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| 233 | }
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| 234 |
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| 235 | static int vmap_try_huge_p4d(p4d_t *p4d, unsigned long addr, unsigned long end,
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| 236 | phys_addr_t phys_addr, pgprot_t prot,
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| 237 | unsigned int max_page_shift)
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| 238 | {
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| 239 | if (max_page_shift < P4D_SHIFT)
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| 240 | return 0;
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| 241 |
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| 242 | if (!arch_vmap_p4d_supported(prot))
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| 243 | return 0;
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| 244 |
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| 245 | if ((end - addr) != P4D_SIZE)
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| 246 | return 0;
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| 247 |
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| 248 | if (!IS_ALIGNED(addr, P4D_SIZE))
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| 249 | return 0;
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| 250 |
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| 251 | if (!IS_ALIGNED(phys_addr, P4D_SIZE))
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| 252 | return 0;
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| 253 |
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| 254 | if (p4d_present(*p4d) && !p4d_free_pud_page(p4d, addr))
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| 255 | return 0;
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| 256 |
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| 257 | return p4d_set_huge(p4d, phys_addr, prot);
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| 258 | }
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| 259 |
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| 260 | static int vmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
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| 261 | phys_addr_t phys_addr, pgprot_t prot,
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| 262 | unsigned int max_page_shift, pgtbl_mod_mask *mask)
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| 263 | {
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| 264 | p4d_t *p4d;
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| 265 | unsigned long next;
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| 266 |
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| 267 | p4d = p4d_alloc_track(&init_mm, pgd, addr, mask);
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| 268 | if (!p4d)
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| 269 | return -ENOMEM;
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| 270 | do {
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| 271 | next = p4d_addr_end(addr, end);
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| 272 |
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| 273 | if (vmap_try_huge_p4d(p4d, addr, next, phys_addr, prot,
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| 274 | max_page_shift)) {
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| 275 | *mask |= PGTBL_P4D_MODIFIED;
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| 276 | continue;
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| 277 | }
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| 278 |
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| 279 | if (vmap_pud_range(p4d, addr, next, phys_addr, prot,
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| 280 | max_page_shift, mask))
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| 281 | return -ENOMEM;
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| 282 | } while (p4d++, phys_addr += (next - addr), addr = next, addr != end);
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| 283 | return 0;
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| 284 | }
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| 285 |
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| 286 | static int vmap_range_noflush(unsigned long addr, unsigned long end,
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| 287 | phys_addr_t phys_addr, pgprot_t prot,
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| 288 | unsigned int max_page_shift)
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| 289 | {
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| 290 | pgd_t *pgd;
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| 291 | unsigned long start;
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| 292 | unsigned long next;
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| 293 | int err;
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| 294 | pgtbl_mod_mask mask = 0;
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| 295 |
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| 296 | might_sleep();
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| 297 | BUG_ON(addr >= end);
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| 298 |
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| 299 | start = addr;
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| 300 | pgd = pgd_offset_k(addr);
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| 301 | do {
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| 302 | next = pgd_addr_end(addr, end);
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| 303 | err = vmap_p4d_range(pgd, addr, next, phys_addr, prot,
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| 304 | max_page_shift, &mask);
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| 305 | if (err)
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| 306 | break;
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| 307 | } while (pgd++, phys_addr += (next - addr), addr = next, addr != end);
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| 308 |
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| 309 | if (mask & ARCH_PAGE_TABLE_SYNC_MASK)
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| 310 | arch_sync_kernel_mappings(start, end);
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| 311 |
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| 312 | return err;
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| 313 | }
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| 314 |
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| 315 | int ioremap_page_range(unsigned long addr, unsigned long end,
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| 316 | phys_addr_t phys_addr, pgprot_t prot)
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| 317 | {
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| 318 | int err;
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| 319 |
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| 320 | err = vmap_range_noflush(addr, end, phys_addr, pgprot_nx(prot),
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| 321 | ioremap_max_page_shift);
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| 322 | flush_cache_vmap(addr, end);
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| 323 | return err;
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| 324 | }
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| 325 |
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| 326 | static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
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| 327 | pgtbl_mod_mask *mask)
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| 328 | {
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| 329 | pte_t *pte;
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| 330 |
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| 331 | pte = pte_offset_kernel(pmd, addr);
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| 332 | do {
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| 333 | pte_t ptent = ptep_get_and_clear(&init_mm, addr, pte);
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| 334 | WARN_ON(!pte_none(ptent) && !pte_present(ptent));
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| 335 | } while (pte++, addr += PAGE_SIZE, addr != end);
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| 336 | *mask |= PGTBL_PTE_MODIFIED;
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| 337 | }
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| 338 |
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| 339 | static void vunmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
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| 340 | pgtbl_mod_mask *mask)
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| 341 | {
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| 342 | pmd_t *pmd;
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| 343 | unsigned long next;
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| 344 | int cleared;
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| 345 |
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| 346 | pmd = pmd_offset(pud, addr);
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| 347 | do {
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| 348 | next = pmd_addr_end(addr, end);
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| 349 |
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| 350 | cleared = pmd_clear_huge(pmd);
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| 351 | if (cleared || pmd_bad(*pmd))
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| 352 | *mask |= PGTBL_PMD_MODIFIED;
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| 353 |
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| 354 | if (cleared)
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| 355 | continue;
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| 356 | if (pmd_none_or_clear_bad(pmd))
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| 357 | continue;
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| 358 | vunmap_pte_range(pmd, addr, next, mask);
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| 359 |
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| 360 | cond_resched();
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| 361 | } while (pmd++, addr = next, addr != end);
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| 362 | }
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| 363 |
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| 364 | static void vunmap_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
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| 365 | pgtbl_mod_mask *mask)
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| 366 | {
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| 367 | pud_t *pud;
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| 368 | unsigned long next;
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| 369 | int cleared;
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| 370 |
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| 371 | pud = pud_offset(p4d, addr);
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| 372 | do {
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| 373 | next = pud_addr_end(addr, end);
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| 374 |
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| 375 | cleared = pud_clear_huge(pud);
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| 376 | if (cleared || pud_bad(*pud))
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| 377 | *mask |= PGTBL_PUD_MODIFIED;
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| 378 |
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| 379 | if (cleared)
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| 380 | continue;
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| 381 | if (pud_none_or_clear_bad(pud))
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| 382 | continue;
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| 383 | vunmap_pmd_range(pud, addr, next, mask);
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| 384 | } while (pud++, addr = next, addr != end);
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| 385 | }
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| 386 |
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| 387 | static void vunmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
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| 388 | pgtbl_mod_mask *mask)
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| 389 | {
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| 390 | p4d_t *p4d;
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| 391 | unsigned long next;
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| 392 |
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| 393 | p4d = p4d_offset(pgd, addr);
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| 394 | do {
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| 395 | next = p4d_addr_end(addr, end);
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| 396 |
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| 397 | p4d_clear_huge(p4d);
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| 398 | if (p4d_bad(*p4d))
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| 399 | *mask |= PGTBL_P4D_MODIFIED;
|
| 400 |
|
| 401 | if (p4d_none_or_clear_bad(p4d))
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| 402 | continue;
|
| 403 | vunmap_pud_range(p4d, addr, next, mask);
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| 404 | } while (p4d++, addr = next, addr != end);
|
| 405 | }
|
| 406 |
|
| 407 | |
| 408 | * vunmap_range_noflush is similar to vunmap_range, but does not
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| 409 | * flush caches or TLBs.
|
| 410 | *
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| 411 | * The caller is responsible for calling flush_cache_vmap() before calling
|
| 412 | * this function, and flush_tlb_kernel_range after it has returned
|
| 413 | * successfully (and before the addresses are expected to cause a page fault
|
| 414 | * or be re-mapped for something else, if TLB flushes are being delayed or
|
| 415 | * coalesced).
|
| 416 | *
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| 417 | * This is an internal function only. Do not use outside mm/.
|
| 418 |
|
| 419 | void vunmap_range_noflush(unsigned long start, unsigned long end)
|
| 420 | {
|
| 421 | unsigned long next;
|
| 422 | pgd_t *pgd;
|
| 423 | unsigned long addr = start;
|
| 424 | pgtbl_mod_mask mask = 0;
|
| 425 |
|
| 426 | BUG_ON(addr >= end);
|
| 427 | pgd = pgd_offset_k(addr);
|
| 428 | do {
|
| 429 | next = pgd_addr_end(addr, end);
|
| 430 | if (pgd_bad(*pgd))
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| 431 | mask |= PGTBL_PGD_MODIFIED;
|
| 432 | if (pgd_none_or_clear_bad(pgd))
|
| 433 | continue;
|
| 434 | vunmap_p4d_range(pgd, addr, next, &mask);
|
| 435 | } while (pgd++, addr = next, addr != end);
|
| 436 |
|
| 437 | if (mask & ARCH_PAGE_TABLE_SYNC_MASK)
|
| 438 | arch_sync_kernel_mappings(start, end);
|
| 439 | }
|
| 440 |
|
| 441 | |
| 442 | * vunmap_range - unmap kernel virtual addresses
|
| 443 | * @addr: start of the VM area to unmap
|
| 444 | * @end: end of the VM area to unmap (non-inclusive)
|
| 445 | *
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| 446 | * Clears any present PTEs in the virtual address range, flushes TLBs and
|
| 447 | * caches. Any subsequent access to the address before it has been re-mapped
|
| 448 | * is a kernel bug.
|
| 449 |
|
| 450 | void vunmap_range(unsigned long addr, unsigned long end)
|
| 451 | {
|
| 452 | flush_cache_vunmap(addr, end);
|
| 453 | vunmap_range_noflush(addr, end);
|
| 454 | flush_tlb_kernel_range(addr, end);
|
| 455 | }
|
| 456 |
|
| 457 | static int vmap_pages_pte_range(pmd_t *pmd, unsigned long addr,
|
| 458 | unsigned long end, pgprot_t prot, struct page **pages, int *nr,
|
| 459 | pgtbl_mod_mask *mask)
|
| 460 | {
|
| 461 | pte_t *pte;
|
| 462 |
|
| 463 | |
| 464 | * nr is a running index into the array which helps higher level
|
| 465 | * callers keep track of where we're up to.
|
| 466 |
|
| 467 |
|
| 468 | pte = pte_alloc_kernel_track(pmd, addr, mask);
|
| 469 | if (!pte)
|
| 470 | return -ENOMEM;
|
| 471 | do {
|
| 472 | struct page *page = pages[*nr];
|
| 473 |
|
| 474 | if (WARN_ON(!pte_none(*pte)))
|
| 475 | return -EBUSY;
|
| 476 | if (WARN_ON(!page))
|
| 477 | return -ENOMEM;
|
| 478 | if (WARN_ON(!pfn_valid(page_to_pfn(page))))
|
| 479 | return -EINVAL;
|
| 480 |
|
| 481 | set_pte_at(&init_mm, addr, pte, mk_pte(page, prot));
|
| 482 | (*nr)++;
|
| 483 | } while (pte++, addr += PAGE_SIZE, addr != end);
|
| 484 | *mask |= PGTBL_PTE_MODIFIED;
|
| 485 | return 0;
|
| 486 | }
|
| 487 |
|
| 488 | static int vmap_pages_pmd_range(pud_t *pud, unsigned long addr,
|
| 489 | unsigned long end, pgprot_t prot, struct page **pages, int *nr,
|
| 490 | pgtbl_mod_mask *mask)
|
| 491 | {
|
| 492 | pmd_t *pmd;
|
| 493 | unsigned long next;
|
| 494 |
|
| 495 | pmd = pmd_alloc_track(&init_mm, pud, addr, mask);
|
| 496 | if (!pmd)
|
| 497 | return -ENOMEM;
|
| 498 | do {
|
| 499 | next = pmd_addr_end(addr, end);
|
| 500 | if (vmap_pages_pte_range(pmd, addr, next, prot, pages, nr, mask))
|
| 501 | return -ENOMEM;
|
| 502 | } while (pmd++, addr = next, addr != end);
|
| 503 | return 0;
|
| 504 | }
|
| 505 |
|
| 506 | static int vmap_pages_pud_range(p4d_t *p4d, unsigned long addr,
|
| 507 | unsigned long end, pgprot_t prot, struct page **pages, int *nr,
|
| 508 | pgtbl_mod_mask *mask)
|
| 509 | {
|
| 510 | pud_t *pud;
|
| 511 | unsigned long next;
|
| 512 |
|
| 513 | pud = pud_alloc_track(&init_mm, p4d, addr, mask);
|
| 514 | if (!pud)
|
| 515 | return -ENOMEM;
|
| 516 | do {
|
| 517 | next = pud_addr_end(addr, end);
|
| 518 | if (vmap_pages_pmd_range(pud, addr, next, prot, pages, nr, mask))
|
| 519 | return -ENOMEM;
|
| 520 | } while (pud++, addr = next, addr != end);
|
| 521 | return 0;
|
| 522 | }
|
| 523 |
|
| 524 | static int vmap_pages_p4d_range(pgd_t *pgd, unsigned long addr,
|
| 525 | unsigned long end, pgprot_t prot, struct page **pages, int *nr,
|
| 526 | pgtbl_mod_mask *mask)
|
| 527 | {
|
| 528 | p4d_t *p4d;
|
| 529 | unsigned long next;
|
| 530 |
|
| 531 | p4d = p4d_alloc_track(&init_mm, pgd, addr, mask);
|
| 532 | if (!p4d)
|
| 533 | return -ENOMEM;
|
| 534 | do {
|
| 535 | next = p4d_addr_end(addr, end);
|
| 536 | if (vmap_pages_pud_range(p4d, addr, next, prot, pages, nr, mask))
|
| 537 | return -ENOMEM;
|
| 538 | } while (p4d++, addr = next, addr != end);
|
| 539 | return 0;
|
| 540 | }
|
| 541 |
|
| 542 | static int vmap_small_pages_range_noflush(unsigned long addr, unsigned long end,
|
| 543 | pgprot_t prot, struct page **pages)
|
| 544 | {
|
| 545 | unsigned long start = addr;
|
| 546 | pgd_t *pgd;
|
| 547 | unsigned long next;
|
| 548 | int err = 0;
|
| 549 | int nr = 0;
|
| 550 | pgtbl_mod_mask mask = 0;
|
| 551 |
|
| 552 | BUG_ON(addr >= end);
|
| 553 | pgd = pgd_offset_k(addr);
|
| 554 | do {
|
| 555 | next = pgd_addr_end(addr, end);
|
| 556 | if (pgd_bad(*pgd))
|
| 557 | mask |= PGTBL_PGD_MODIFIED;
|
| 558 | err = vmap_pages_p4d_range(pgd, addr, next, prot, pages, &nr, &mask);
|
| 559 | if (err)
|
| 560 | return err;
|
| 561 | } while (pgd++, addr = next, addr != end);
|
| 562 |
|
| 563 | if (mask & ARCH_PAGE_TABLE_SYNC_MASK)
|
| 564 | arch_sync_kernel_mappings(start, end);
|
| 565 |
|
| 566 | return 0;
|
| 567 | }
|
| 568 |
|
| 569 | |
| 570 | * vmap_pages_range_noflush is similar to vmap_pages_range, but does not
|
| 571 | * flush caches.
|
| 572 | *
|
| 573 | * The caller is responsible for calling flush_cache_vmap() after this
|
| 574 | * function returns successfully and before the addresses are accessed.
|
| 575 | *
|
| 576 | * This is an internal function only. Do not use outside mm/.
|
| 577 |
|
| 578 | int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
|
| 579 | pgprot_t prot, struct page **pages, unsigned int page_shift)
|
| 580 | {
|
| 581 | unsigned int i, nr = (end - addr) >> PAGE_SHIFT;
|
| 582 |
|
| 583 | WARN_ON(page_shift < PAGE_SHIFT);
|
| 584 |
|
| 585 | if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMALLOC) ||
|
| 586 | page_shift == PAGE_SHIFT)
|
| 587 | return vmap_small_pages_range_noflush(addr, end, prot, pages);
|
| 588 |
|
| 589 | for (i = 0; i < nr; i += 1U << (page_shift - PAGE_SHIFT)) {
|
| 590 | int err;
|
| 591 |
|
| 592 | err = vmap_range_noflush(addr, addr + (1UL << page_shift),
|
| 593 | __pa(page_address(pages[i])), prot,
|
| 594 | page_shift);
|
| 595 | if (err)
|
| 596 | return err;
|
| 597 |
|
| 598 | addr += 1UL << page_shift;
|
| 599 | }
|
| 600 |
|
| 601 | return 0;
|
| 602 | }
|
| 603 |
|
| 604 | |
| 605 | * vmap_pages_range - map pages to a kernel virtual address
|
| 606 | * @addr: start of the VM area to map
|
| 607 | * @end: end of the VM area to map (non-inclusive)
|
| 608 | * @prot: page protection flags to use
|
| 609 | * @pages: pages to map (always PAGE_SIZE pages)
|
| 610 | * @page_shift: maximum shift that the pages may be mapped with, @pages must
|
| 611 | * be aligned and contiguous up to at least this shift.
|
| 612 | *
|
| 613 | * RETURNS:
|
| 614 | * 0 on success, -errno on failure.
|
| 615 |
|
| 616 | static int vmap_pages_range(unsigned long addr, unsigned long end,
|
| 617 | pgprot_t prot, struct page **pages, unsigned int page_shift)
|
| 618 | {
|
| 619 | int err;
|
| 620 |
|
| 621 | err = vmap_pages_range_noflush(addr, end, prot, pages, page_shift);
|
| 622 | flush_cache_vmap(addr, end);
|
| 623 | return err;
|
| 624 | }
|
| 625 |
|
| 626 | int is_vmalloc_or_module_addr(const void *x)
|
| 627 | {
|
| 628 | |
| 629 | * ARM, x86-64 and sparc64 put modules in a special place,
|
| 630 | * and fall back on vmalloc() if that fails. Others
|
| 631 | * just put it in the vmalloc space.
|
| 632 |
|
| 633 | #if defined(CONFIG_MODULES) && defined(MODULES_VADDR)
|
| 634 | unsigned long addr = (unsigned long)kasan_reset_tag(x);
|
| 635 | if (addr >= MODULES_VADDR && addr < MODULES_END)
|
| 636 | return 1;
|
| 637 | #endif
|
| 638 | return is_vmalloc_addr(x);
|
| 639 | }
|
| 640 |
|
| 641 | |
| 642 | * Walk a vmap address to the struct page it maps. Huge vmap mappings will
|
| 643 | * return the tail page that corresponds to the base page address, which
|
| 644 | * matches small vmap mappings.
|
| 645 |
|
| 646 | struct page *vmalloc_to_page(const void *vmalloc_addr)
|
| 647 | {
|
| 648 | unsigned long addr = (unsigned long) vmalloc_addr;
|
| 649 | struct page *page = NULL;
|
| 650 | pgd_t *pgd = pgd_offset_k(addr);
|
| 651 | p4d_t *p4d;
|
| 652 | pud_t *pud;
|
| 653 | pmd_t *pmd;
|
| 654 | pte_t *ptep, pte;
|
| 655 |
|
| 656 | |
| 657 | * XXX we might need to change this if we add VIRTUAL_BUG_ON for
|
| 658 | * architectures that do not vmalloc module space
|
| 659 |
|
| 660 | VIRTUAL_BUG_ON(!is_vmalloc_or_module_addr(vmalloc_addr));
|
| 661 |
|
| 662 | if (pgd_none(*pgd))
|
| 663 | return NULL;
|
| 664 | if (WARN_ON_ONCE(pgd_leaf(*pgd)))
|
| 665 | return NULL;
|
| 666 | if (WARN_ON_ONCE(pgd_bad(*pgd)))
|
| 667 | return NULL;
|
| 668 |
|
| 669 | p4d = p4d_offset(pgd, addr);
|
| 670 | if (p4d_none(*p4d))
|
| 671 | return NULL;
|
| 672 | if (p4d_leaf(*p4d))
|
| 673 | return p4d_page(*p4d) + ((addr & ~P4D_MASK) >> PAGE_SHIFT);
|
| 674 | if (WARN_ON_ONCE(p4d_bad(*p4d)))
|
| 675 | return NULL;
|
| 676 |
|
| 677 | pud = pud_offset(p4d, addr);
|
| 678 | if (pud_none(*pud))
|
| 679 | return NULL;
|
| 680 | if (pud_leaf(*pud))
|
| 681 | return pud_page(*pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
|
| 682 | if (WARN_ON_ONCE(pud_bad(*pud)))
|
| 683 | return NULL;
|
| 684 |
|
| 685 | pmd = pmd_offset(pud, addr);
|
| 686 | if (pmd_none(*pmd))
|
| 687 | return NULL;
|
| 688 | if (pmd_leaf(*pmd))
|
| 689 | return pmd_page(*pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
|
| 690 | if (WARN_ON_ONCE(pmd_bad(*pmd)))
|
| 691 | return NULL;
|
| 692 |
|
| 693 | ptep = pte_offset_map(pmd, addr);
|
| 694 | pte = *ptep;
|
| 695 | if (pte_present(pte))
|
| 696 | page = pte_page(pte);
|
| 697 | pte_unmap(ptep);
|
| 698 |
|
| 699 | return page;
|
| 700 | }
|
| 701 | EXPORT_SYMBOL(vmalloc_to_page);
|
| 702 |
|
| 703 | |
| 704 | * Map a vmalloc()-space virtual address to the physical page frame number.
|
| 705 |
|
| 706 | unsigned long vmalloc_to_pfn(const void *vmalloc_addr)
|
| 707 | {
|
| 708 | return page_to_pfn(vmalloc_to_page(vmalloc_addr));
|
| 709 | }
|
| 710 | EXPORT_SYMBOL(vmalloc_to_pfn);
|
| 711 |
|
| 712 |
|
| 713 |
|
| 714 |
|
| 715 | #define DEBUG_AUGMENT_PROPAGATE_CHECK 0
|
| 716 | #define DEBUG_AUGMENT_LOWEST_MATCH_CHECK 0
|
| 717 |
|
| 718 |
|
| 719 | static DEFINE_SPINLOCK(vmap_area_lock);
|
| 720 | static DEFINE_SPINLOCK(free_vmap_area_lock);
|
| 721 |
|
| 722 | LIST_HEAD(vmap_area_list);
|
| 723 | static struct rb_root vmap_area_root = RB_ROOT;
|
| 724 | static bool vmap_initialized __read_mostly;
|
| 725 |
|
| 726 | static struct rb_root purge_vmap_area_root = RB_ROOT;
|
| 727 | static LIST_HEAD(purge_vmap_area_list);
|
| 728 | static DEFINE_SPINLOCK(purge_vmap_area_lock);
|
| 729 |
|
| 730 | |
| 731 | * This kmem_cache is used for vmap_area objects. Instead of
|
| 732 | * allocating from slab we reuse an object from this cache to
|
| 733 | * make things faster. Especially in "no edge" splitting of
|
| 734 | * free block.
|
| 735 |
|
| 736 | static struct kmem_cache *vmap_area_cachep;
|
| 737 |
|
| 738 | |
| 739 | * This linked list is used in pair with free_vmap_area_root.
|
| 740 | * It gives O(1) access to prev/next to perform fast coalescing.
|
| 741 |
|
| 742 | static LIST_HEAD(free_vmap_area_list);
|
| 743 |
|
| 744 | |
| 745 | * This augment red-black tree represents the free vmap space.
|
| 746 | * All vmap_area objects in this tree are sorted by va->va_start
|
| 747 | * address. It is used for allocation and merging when a vmap
|
| 748 | * object is released.
|
| 749 | *
|
| 750 | * Each vmap_area node contains a maximum available free block
|
| 751 | * of its sub-tree, right or left. Therefore it is possible to
|
| 752 | * find a lowest match of free area.
|
| 753 |
|
| 754 | static struct rb_root free_vmap_area_root = RB_ROOT;
|
| 755 |
|
| 756 | |
| 757 | * Preload a CPU with one object for "no edge" split case. The
|
| 758 | * aim is to get rid of allocations from the atomic context, thus
|
| 759 | * to use more permissive allocation masks.
|
| 760 |
|
| 761 | static DEFINE_PER_CPU(struct vmap_area *, ne_fit_preload_node);
|
| 762 |
|
| 763 | static __always_inline unsigned long
|
| 764 | va_size(struct vmap_area *va)
|
| 765 | {
|
| 766 | return (va->va_end - va->va_start);
|
| 767 | }
|
| 768 |
|
| 769 | static __always_inline unsigned long
|
| 770 | get_subtree_max_size(struct rb_node *node)
|
| 771 | {
|
| 772 | struct vmap_area *va;
|
| 773 |
|
| 774 | va = rb_entry_safe(node, struct vmap_area, rb_node);
|
| 775 | return va ? va->subtree_max_size : 0;
|
| 776 | }
|
| 777 |
|
| 778 | RB_DECLARE_CALLBACKS_MAX(static, free_vmap_area_rb_augment_cb,
|
| 779 | struct vmap_area, rb_node, unsigned long, subtree_max_size, va_size)
|
| 780 |
|
| 781 | static void purge_vmap_area_lazy(void);
|
| 782 | static BLOCKING_NOTIFIER_HEAD(vmap_notify_list);
|
| 783 | static void drain_vmap_area_work(struct work_struct *work);
|
| 784 | static DECLARE_WORK(drain_vmap_work, drain_vmap_area_work);
|
| 785 |
|
| 786 | static atomic_long_t nr_vmalloc_pages;
|
| 787 |
|
| 788 | unsigned long vmalloc_nr_pages(void)
|
| 789 | {
|
| 790 | return atomic_long_read(&nr_vmalloc_pages);
|
| 791 | }
|
| 792 |
|
| 793 |
|
| 794 | static struct vmap_area *find_vmap_area_exceed_addr(unsigned long addr)
|
| 795 | {
|
| 796 | struct vmap_area *va = NULL;
|
| 797 | struct rb_node *n = vmap_area_root.rb_node;
|
| 798 |
|
| 799 | addr = (unsigned long)kasan_reset_tag((void *)addr);
|
| 800 |
|
| 801 | while (n) {
|
| 802 | struct vmap_area *tmp;
|
| 803 |
|
| 804 | tmp = rb_entry(n, struct vmap_area, rb_node);
|
| 805 | if (tmp->va_end > addr) {
|
| 806 | va = tmp;
|
| 807 | if (tmp->va_start <= addr)
|
| 808 | break;
|
| 809 |
|
| 810 | n = n->rb_left;
|
| 811 | } else
|
| 812 | n = n->rb_right;
|
| 813 | }
|
| 814 |
|
| 815 | return va;
|
| 816 | }
|
| 817 |
|
| 818 | static struct vmap_area *__find_vmap_area(unsigned long addr, struct rb_root *root)
|
| 819 | {
|
| 820 | struct rb_node *n = root->rb_node;
|
| 821 |
|
| 822 | addr = (unsigned long)kasan_reset_tag((void *)addr);
|
| 823 |
|
| 824 | while (n) {
|
| 825 | struct vmap_area *va;
|
| 826 |
|
| 827 | va = rb_entry(n, struct vmap_area, rb_node);
|
| 828 | if (addr < va->va_start)
|
| 829 | n = n->rb_left;
|
| 830 | else if (addr >= va->va_end)
|
| 831 | n = n->rb_right;
|
| 832 | else
|
| 833 | return va;
|
| 834 | }
|
| 835 |
|
| 836 | return NULL;
|
| 837 | }
|
| 838 |
|
| 839 | |
| 840 | * This function returns back addresses of parent node
|
| 841 | * and its left or right link for further processing.
|
| 842 | *
|
| 843 | * Otherwise NULL is returned. In that case all further
|
| 844 | * steps regarding inserting of conflicting overlap range
|
| 845 | * have to be declined and actually considered as a bug.
|
| 846 |
|
| 847 | static __always_inline struct rb_node **
|
| 848 | find_va_links(struct vmap_area *va,
|
| 849 | struct rb_root *root, struct rb_node *from,
|
| 850 | struct rb_node **parent)
|
| 851 | {
|
| 852 | struct vmap_area *tmp_va;
|
| 853 | struct rb_node **link;
|
| 854 |
|
| 855 | if (root) {
|
| 856 | link = &root->rb_node;
|
| 857 | if (unlikely(!*link)) {
|
| 858 | *parent = NULL;
|
| 859 | return link;
|
| 860 | }
|
| 861 | } else {
|
| 862 | link = &from;
|
| 863 | }
|
| 864 |
|
| 865 | |
| 866 | * Go to the bottom of the tree. When we hit the last point
|
| 867 | * we end up with parent rb_node and correct direction, i name
|
| 868 | * it link, where the new va->rb_node will be attached to.
|
| 869 |
|
| 870 | do {
|
| 871 | tmp_va = rb_entry(*link, struct vmap_area, rb_node);
|
| 872 |
|
| 873 | |
| 874 | * During the traversal we also do some sanity check.
|
| 875 | * Trigger the BUG() if there are sides(left/right)
|
| 876 | * or full overlaps.
|
| 877 |
|
| 878 | if (va->va_end <= tmp_va->va_start)
|
| 879 | link = &(*link)->rb_left;
|
| 880 | else if (va->va_start >= tmp_va->va_end)
|
| 881 | link = &(*link)->rb_right;
|
| 882 | else {
|
| 883 | WARN(1, "vmalloc bug: 0x%lx-0x%lx overlaps with 0x%lx-0x%lx\n",
|
| 884 | va->va_start, va->va_end, tmp_va->va_start, tmp_va->va_end);
|
| 885 |
|
| 886 | return NULL;
|
| 887 | }
|
| 888 | } while (*link);
|
| 889 |
|
| 890 | *parent = &tmp_va->rb_node;
|
| 891 | return link;
|
| 892 | }
|
| 893 |
|
| 894 | static __always_inline struct list_head *
|
| 895 | get_va_next_sibling(struct rb_node *parent, struct rb_node **link)
|
| 896 | {
|
| 897 | struct list_head *list;
|
| 898 |
|
| 899 | if (unlikely(!parent))
|
| 900 | |
| 901 | * The red-black tree where we try to find VA neighbors
|
| 902 | * before merging or inserting is empty, i.e. it means
|
| 903 | * there is no free vmap space. Normally it does not
|
| 904 | * happen but we handle this case anyway.
|
| 905 |
|
| 906 | return NULL;
|
| 907 |
|
| 908 | list = &rb_entry(parent, struct vmap_area, rb_node)->list;
|
| 909 | return (&parent->rb_right == link ? list->next : list);
|
| 910 | }
|
| 911 |
|
| 912 | static __always_inline void
|
| 913 | __link_va(struct vmap_area *va, struct rb_root *root,
|
| 914 | struct rb_node *parent, struct rb_node **link,
|
| 915 | struct list_head *head, bool augment)
|
| 916 | {
|
| 917 | |
| 918 | * VA is still not in the list, but we can
|
| 919 | * identify its future previous list_head node.
|
| 920 |
|
| 921 | if (likely(parent)) {
|
| 922 | head = &rb_entry(parent, struct vmap_area, rb_node)->list;
|
| 923 | if (&parent->rb_right != link)
|
| 924 | head = head->prev;
|
| 925 | }
|
| 926 |
|
| 927 |
|
| 928 | rb_link_node(&va->rb_node, parent, link);
|
| 929 | if (augment) {
|
| 930 | |
| 931 | * Some explanation here. Just perform simple insertion
|
| 932 | * to the tree. We do not set va->subtree_max_size to
|
| 933 | * its current size before calling rb_insert_augmented().
|
| 934 | * It is because we populate the tree from the bottom
|
| 935 | * to parent levels when the node _is_ in the tree.
|
| 936 | *
|
| 937 | * Therefore we set subtree_max_size to zero after insertion,
|
| 938 | * to let __augment_tree_propagate_from() puts everything to
|
| 939 | * the correct order later on.
|
| 940 |
|
| 941 | rb_insert_augmented(&va->rb_node,
|
| 942 | root, &free_vmap_area_rb_augment_cb);
|
| 943 | va->subtree_max_size = 0;
|
| 944 | } else {
|
| 945 | rb_insert_color(&va->rb_node, root);
|
| 946 | }
|
| 947 |
|
| 948 |
|
| 949 | list_add(&va->list, head);
|
| 950 | }
|
| 951 |
|
| 952 | static __always_inline void
|
| 953 | link_va(struct vmap_area *va, struct rb_root *root,
|
| 954 | struct rb_node *parent, struct rb_node **link,
|
| 955 | struct list_head *head)
|
| 956 | {
|
| 957 | __link_va(va, root, parent, link, head, false);
|
| 958 | }
|
| 959 |
|
| 960 | static __always_inline void
|
| 961 | link_va_augment(struct vmap_area *va, struct rb_root *root,
|
| 962 | struct rb_node *parent, struct rb_node **link,
|
| 963 | struct list_head *head)
|
| 964 | {
|
| 965 | __link_va(va, root, parent, link, head, true);
|
| 966 | }
|
| 967 |
|
| 968 | static __always_inline void
|
| 969 | __unlink_va(struct vmap_area *va, struct rb_root *root, bool augment)
|
| 970 | {
|
| 971 | if (WARN_ON(RB_EMPTY_NODE(&va->rb_node)))
|
| 972 | return;
|
| 973 |
|
| 974 | if (augment)
|
| 975 | rb_erase_augmented(&va->rb_node,
|
| 976 | root, &free_vmap_area_rb_augment_cb);
|
| 977 | else
|
| 978 | rb_erase(&va->rb_node, root);
|
| 979 |
|
| 980 | list_del_init(&va->list);
|
| 981 | RB_CLEAR_NODE(&va->rb_node);
|
| 982 | }
|
| 983 |
|
| 984 | static __always_inline void
|
| 985 | unlink_va(struct vmap_area *va, struct rb_root *root)
|
| 986 | {
|
| 987 | __unlink_va(va, root, false);
|
| 988 | }
|
| 989 |
|
| 990 | static __always_inline void
|
| 991 | unlink_va_augment(struct vmap_area *va, struct rb_root *root)
|
| 992 | {
|
| 993 | __unlink_va(va, root, true);
|
| 994 | }
|
| 995 |
|
| 996 | #if DEBUG_AUGMENT_PROPAGATE_CHECK
|
| 997 | |
| 998 | * Gets called when remove the node and rotate.
|
| 999 |
|
| 1000 | static __always_inline unsigned long
|
| 1001 | compute_subtree_max_size(struct vmap_area *va)
|
| 1002 | {
|
| 1003 | return max3(va_size(va),
|
| 1004 | get_subtree_max_size(va->rb_node.rb_left),
|
| 1005 | get_subtree_max_size(va->rb_node.rb_right));
|
| 1006 | }
|
| 1007 |
|
| 1008 | static void
|
| 1009 | augment_tree_propagate_check(void)
|
| 1010 | {
|
| 1011 | struct vmap_area *va;
|
| 1012 | unsigned long computed_size;
|
| 1013 |
|
| 1014 | list_for_each_entry(va, &free_vmap_area_list, list) {
|
| 1015 | computed_size = compute_subtree_max_size(va);
|
| 1016 | if (computed_size != va->subtree_max_size)
|
| 1017 | pr_emerg("tree is corrupted: %lu, %lu\n",
|
| 1018 | va_size(va), va->subtree_max_size);
|
| 1019 | }
|
| 1020 | }
|
| 1021 | #endif
|
| 1022 |
|
| 1023 | |
| 1024 | * This function populates subtree_max_size from bottom to upper
|
| 1025 | * levels starting from VA point. The propagation must be done
|
| 1026 | * when VA size is modified by changing its va_start/va_end. Or
|
| 1027 | * in case of newly inserting of VA to the tree.
|
| 1028 | *
|
| 1029 | * It means that __augment_tree_propagate_from() must be called:
|
| 1030 | * - After VA has been inserted to the tree(free path);
|
| 1031 | * - After VA has been shrunk(allocation path);
|
| 1032 | * - After VA has been increased(merging path).
|
| 1033 | *
|
| 1034 | * Please note that, it does not mean that upper parent nodes
|
| 1035 | * and their subtree_max_size are recalculated all the time up
|
| 1036 | * to the root node.
|
| 1037 | *
|
| 1038 | * 4--8
|
| 1039 | * /\
|
| 1040 | * / \
|
| 1041 | * / \
|
| 1042 | * 2--2 8--8
|
| 1043 | *
|
| 1044 | * For example if we modify the node 4, shrinking it to 2, then
|
| 1045 | * no any modification is required. If we shrink the node 2 to 1
|
| 1046 | * its subtree_max_size is updated only, and set to 1. If we shrink
|
| 1047 | * the node 8 to 6, then its subtree_max_size is set to 6 and parent
|
| 1048 | * node becomes 4--6.
|
| 1049 |
|
| 1050 | static __always_inline void
|
| 1051 | augment_tree_propagate_from(struct vmap_area *va)
|
| 1052 | {
|
| 1053 | |
| 1054 | * Populate the tree from bottom towards the root until
|
| 1055 | * the calculated maximum available size of checked node
|
| 1056 | * is equal to its current one.
|
| 1057 |
|
| 1058 | free_vmap_area_rb_augment_cb_propagate(&va->rb_node, NULL);
|
| 1059 |
|
| 1060 | #if DEBUG_AUGMENT_PROPAGATE_CHECK
|
| 1061 | augment_tree_propagate_check();
|
| 1062 | #endif
|
| 1063 | }
|
| 1064 |
|
| 1065 | static void
|
| 1066 | insert_vmap_area(struct vmap_area *va,
|
| 1067 | struct rb_root *root, struct list_head *head)
|
| 1068 | {
|
| 1069 | struct rb_node **link;
|
| 1070 | struct rb_node *parent;
|
| 1071 |
|
| 1072 | link = find_va_links(va, root, NULL, &parent);
|
| 1073 | if (link)
|
| 1074 | link_va(va, root, parent, link, head);
|
| 1075 | }
|
| 1076 |
|
| 1077 | static void
|
| 1078 | insert_vmap_area_augment(struct vmap_area *va,
|
| 1079 | struct rb_node *from, struct rb_root *root,
|
| 1080 | struct list_head *head)
|
| 1081 | {
|
| 1082 | struct rb_node **link;
|
| 1083 | struct rb_node *parent;
|
| 1084 |
|
| 1085 | if (from)
|
| 1086 | link = find_va_links(va, NULL, from, &parent);
|
| 1087 | else
|
| 1088 | link = find_va_links(va, root, NULL, &parent);
|
| 1089 |
|
| 1090 | if (link) {
|
| 1091 | link_va_augment(va, root, parent, link, head);
|
| 1092 | augment_tree_propagate_from(va);
|
| 1093 | }
|
| 1094 | }
|
| 1095 |
|
| 1096 | |
| 1097 | * Merge de-allocated chunk of VA memory with previous
|
| 1098 | * and next free blocks. If coalesce is not done a new
|
| 1099 | * free area is inserted. If VA has been merged, it is
|
| 1100 | * freed.
|
| 1101 | *
|
| 1102 | * Please note, it can return NULL in case of overlap
|
| 1103 | * ranges, followed by WARN() report. Despite it is a
|
| 1104 | * buggy behaviour, a system can be alive and keep
|
| 1105 | * ongoing.
|
| 1106 |
|
| 1107 | static __always_inline struct vmap_area *
|
| 1108 | __merge_or_add_vmap_area(struct vmap_area *va,
|
| 1109 | struct rb_root *root, struct list_head *head, bool augment)
|
| 1110 | {
|
| 1111 | struct vmap_area *sibling;
|
| 1112 | struct list_head *next;
|
| 1113 | struct rb_node **link;
|
| 1114 | struct rb_node *parent;
|
| 1115 | bool merged = false;
|
| 1116 |
|
| 1117 | |
| 1118 | * Find a place in the tree where VA potentially will be
|
| 1119 | * inserted, unless it is merged with its sibling/siblings.
|
| 1120 |
|
| 1121 | link = find_va_links(va, root, NULL, &parent);
|
| 1122 | if (!link)
|
| 1123 | return NULL;
|
| 1124 |
|
| 1125 | |
| 1126 | * Get next node of VA to check if merging can be done.
|
| 1127 |
|
| 1128 | next = get_va_next_sibling(parent, link);
|
| 1129 | if (unlikely(next == NULL))
|
| 1130 | goto insert;
|
| 1131 |
|
| 1132 | |
| 1133 | * start end
|
| 1134 | * | |
|
| 1135 | * |<------VA------>|<-----Next----->|
|
| 1136 | * | |
|
| 1137 | * start end
|
| 1138 |
|
| 1139 | if (next != head) {
|
| 1140 | sibling = list_entry(next, struct vmap_area, list);
|
| 1141 | if (sibling->va_start == va->va_end) {
|
| 1142 | sibling->va_start = va->va_start;
|
| 1143 |
|
| 1144 |
|
| 1145 | kmem_cache_free(vmap_area_cachep, va);
|
| 1146 |
|
| 1147 |
|
| 1148 | va = sibling;
|
| 1149 | merged = true;
|
| 1150 | }
|
| 1151 | }
|
| 1152 |
|
| 1153 | |
| 1154 | * start end
|
| 1155 | * | |
|
| 1156 | * |<-----Prev----->|<------VA------>|
|
| 1157 | * | |
|
| 1158 | * start end
|
| 1159 |
|
| 1160 | if (next->prev != head) {
|
| 1161 | sibling = list_entry(next->prev, struct vmap_area, list);
|
| 1162 | if (sibling->va_end == va->va_start) {
|
| 1163 | |
| 1164 | * If both neighbors are coalesced, it is important
|
| 1165 | * to unlink the "next" node first, followed by merging
|
| 1166 | * with "previous" one. Otherwise the tree might not be
|
| 1167 | * fully populated if a sibling's augmented value is
|
| 1168 | * "normalized" because of rotation operations.
|
| 1169 |
|
| 1170 | if (merged)
|
| 1171 | __unlink_va(va, root, augment);
|
| 1172 |
|
| 1173 | sibling->va_end = va->va_end;
|
| 1174 |
|
| 1175 |
|
| 1176 | kmem_cache_free(vmap_area_cachep, va);
|
| 1177 |
|
| 1178 |
|
| 1179 | va = sibling;
|
| 1180 | merged = true;
|
| 1181 | }
|
| 1182 | }
|
| 1183 |
|
| 1184 | insert:
|
| 1185 | if (!merged)
|
| 1186 | __link_va(va, root, parent, link, head, augment);
|
| 1187 |
|
| 1188 | return va;
|
| 1189 | }
|
| 1190 |
|
| 1191 | static __always_inline struct vmap_area *
|
| 1192 | merge_or_add_vmap_area(struct vmap_area *va,
|
| 1193 | struct rb_root *root, struct list_head *head)
|
| 1194 | {
|
| 1195 | return __merge_or_add_vmap_area(va, root, head, false);
|
| 1196 | }
|
| 1197 |
|
| 1198 | static __always_inline struct vmap_area *
|
| 1199 | merge_or_add_vmap_area_augment(struct vmap_area *va,
|
| 1200 | struct rb_root *root, struct list_head *head)
|
| 1201 | {
|
| 1202 | va = __merge_or_add_vmap_area(va, root, head, true);
|
| 1203 | if (va)
|
| 1204 | augment_tree_propagate_from(va);
|
| 1205 |
|
| 1206 | return va;
|
| 1207 | }
|
| 1208 |
|
| 1209 | static __always_inline bool
|
| 1210 | is_within_this_va(struct vmap_area *va, unsigned long size,
|
| 1211 | unsigned long align, unsigned long vstart)
|
| 1212 | {
|
| 1213 | unsigned long nva_start_addr;
|
| 1214 |
|
| 1215 | if (va->va_start > vstart)
|
| 1216 | nva_start_addr = ALIGN(va->va_start, align);
|
| 1217 | else
|
| 1218 | nva_start_addr = ALIGN(vstart, align);
|
| 1219 |
|
| 1220 |
|
| 1221 | if (nva_start_addr + size < nva_start_addr ||
|
| 1222 | nva_start_addr < vstart)
|
| 1223 | return false;
|
| 1224 |
|
| 1225 | return (nva_start_addr + size <= va->va_end);
|
| 1226 | }
|
| 1227 |
|
| 1228 | |
| 1229 | * Find the first free block(lowest start address) in the tree,
|
| 1230 | * that will accomplish the request corresponding to passing
|
| 1231 | * parameters. Please note, with an alignment bigger than PAGE_SIZE,
|
| 1232 | * a search length is adjusted to account for worst case alignment
|
| 1233 | * overhead.
|
| 1234 |
|
| 1235 | static __always_inline struct vmap_area *
|
| 1236 | find_vmap_lowest_match(struct rb_root *root, unsigned long size,
|
| 1237 | unsigned long align, unsigned long vstart, bool adjust_search_size)
|
| 1238 | {
|
| 1239 | struct vmap_area *va;
|
| 1240 | struct rb_node *node;
|
| 1241 | unsigned long length;
|
| 1242 |
|
| 1243 |
|
| 1244 | node = root->rb_node;
|
| 1245 |
|
| 1246 |
|
| 1247 | length = adjust_search_size ? size + align - 1 : size;
|
| 1248 |
|
| 1249 | while (node) {
|
| 1250 | va = rb_entry(node, struct vmap_area, rb_node);
|
| 1251 |
|
| 1252 | if (get_subtree_max_size(node->rb_left) >= length &&
|
| 1253 | vstart < va->va_start) {
|
| 1254 | node = node->rb_left;
|
| 1255 | } else {
|
| 1256 | if (is_within_this_va(va, size, align, vstart))
|
| 1257 | return va;
|
| 1258 |
|
| 1259 | |
| 1260 | * Does not make sense to go deeper towards the right
|
| 1261 | * sub-tree if it does not have a free block that is
|
| 1262 | * equal or bigger to the requested search length.
|
| 1263 |
|
| 1264 | if (get_subtree_max_size(node->rb_right) >= length) {
|
| 1265 | node = node->rb_right;
|
| 1266 | continue;
|
| 1267 | }
|
| 1268 |
|
| 1269 | |
| 1270 | * OK. We roll back and find the first right sub-tree,
|
| 1271 | * that will satisfy the search criteria. It can happen
|
| 1272 | * due to "vstart" restriction or an alignment overhead
|
| 1273 | * that is bigger then PAGE_SIZE.
|
| 1274 |
|
| 1275 | while ((node = rb_parent(node))) {
|
| 1276 | va = rb_entry(node, struct vmap_area, rb_node);
|
| 1277 | if (is_within_this_va(va, size, align, vstart))
|
| 1278 | return va;
|
| 1279 |
|
| 1280 | if (get_subtree_max_size(node->rb_right) >= length &&
|
| 1281 | vstart <= va->va_start) {
|
| 1282 | |
| 1283 | * Shift the vstart forward. Please note, we update it with
|
| 1284 | * parent's start address adding "1" because we do not want
|
| 1285 | * to enter same sub-tree after it has already been checked
|
| 1286 | * and no suitable free block found there.
|
| 1287 |
|
| 1288 | vstart = va->va_start + 1;
|
| 1289 | node = node->rb_right;
|
| 1290 | break;
|
| 1291 | }
|
| 1292 | }
|
| 1293 | }
|
| 1294 | }
|
| 1295 |
|
| 1296 | return NULL;
|
| 1297 | }
|
| 1298 |
|
| 1299 | #if DEBUG_AUGMENT_LOWEST_MATCH_CHECK
|
| 1300 | #include <linux/random.h>
|
| 1301 |
|
| 1302 | static struct vmap_area *
|
| 1303 | find_vmap_lowest_linear_match(unsigned long size,
|
| 1304 | unsigned long align, unsigned long vstart)
|
| 1305 | {
|
| 1306 | struct vmap_area *va;
|
| 1307 |
|
| 1308 | list_for_each_entry(va, &free_vmap_area_list, list) {
|
| 1309 | if (!is_within_this_va(va, size, align, vstart))
|
| 1310 | continue;
|
| 1311 |
|
| 1312 | return va;
|
| 1313 | }
|
| 1314 |
|
| 1315 | return NULL;
|
| 1316 | }
|
| 1317 |
|
| 1318 | static void
|
| 1319 | find_vmap_lowest_match_check(unsigned long size, unsigned long align)
|
| 1320 | {
|
| 1321 | struct vmap_area *va_1, *va_2;
|
| 1322 | unsigned long vstart;
|
| 1323 | unsigned int rnd;
|
| 1324 |
|
| 1325 | get_random_bytes(&rnd, sizeof(rnd));
|
| 1326 | vstart = VMALLOC_START + rnd;
|
| 1327 |
|
| 1328 | va_1 = find_vmap_lowest_match(size, align, vstart, false);
|
| 1329 | va_2 = find_vmap_lowest_linear_match(size, align, vstart);
|
| 1330 |
|
| 1331 | if (va_1 != va_2)
|
| 1332 | pr_emerg("not lowest: t: 0x%p, l: 0x%p, v: 0x%lx\n",
|
| 1333 | va_1, va_2, vstart);
|
| 1334 | }
|
| 1335 | #endif
|
| 1336 |
|
| 1337 | enum fit_type {
|
| 1338 | NOTHING_FIT = 0,
|
| 1339 | FL_FIT_TYPE = 1,
|
| 1340 | LE_FIT_TYPE = 2,
|
| 1341 | RE_FIT_TYPE = 3,
|
| 1342 | NE_FIT_TYPE = 4
|
| 1343 | };
|
| 1344 |
|
| 1345 | static __always_inline enum fit_type
|
| 1346 | classify_va_fit_type(struct vmap_area *va,
|
| 1347 | unsigned long nva_start_addr, unsigned long size)
|
| 1348 | {
|
| 1349 | enum fit_type type;
|
| 1350 |
|
| 1351 |
|
| 1352 | if (nva_start_addr < va->va_start ||
|
| 1353 | nva_start_addr + size > va->va_end)
|
| 1354 | return NOTHING_FIT;
|
| 1355 |
|
| 1356 |
|
| 1357 | if (va->va_start == nva_start_addr) {
|
| 1358 | if (va->va_end == nva_start_addr + size)
|
| 1359 | type = FL_FIT_TYPE;
|
| 1360 | else
|
| 1361 | type = LE_FIT_TYPE;
|
| 1362 | } else if (va->va_end == nva_start_addr + size) {
|
| 1363 | type = RE_FIT_TYPE;
|
| 1364 | } else {
|
| 1365 | type = NE_FIT_TYPE;
|
| 1366 | }
|
| 1367 |
|
| 1368 | return type;
|
| 1369 | }
|
| 1370 |
|
| 1371 | static __always_inline int
|
| 1372 | adjust_va_to_fit_type(struct rb_root *root, struct list_head *head,
|
| 1373 | struct vmap_area *va, unsigned long nva_start_addr,
|
| 1374 | unsigned long size)
|
| 1375 | {
|
| 1376 | struct vmap_area *lva = NULL;
|
| 1377 | enum fit_type type = classify_va_fit_type(va, nva_start_addr, size);
|
| 1378 |
|
| 1379 | if (type == FL_FIT_TYPE) {
|
| 1380 | |
| 1381 | * No need to split VA, it fully fits.
|
| 1382 | *
|
| 1383 | * | |
|
| 1384 | * V NVA V
|
| 1385 | * |---------------|
|
| 1386 |
|
| 1387 | unlink_va_augment(va, root);
|
| 1388 | kmem_cache_free(vmap_area_cachep, va);
|
| 1389 | } else if (type == LE_FIT_TYPE) {
|
| 1390 | |
| 1391 | * Split left edge of fit VA.
|
| 1392 | *
|
| 1393 | * | |
|
| 1394 | * V NVA V R
|
| 1395 | * |-------|-------|
|
| 1396 |
|
| 1397 | va->va_start += size;
|
| 1398 | } else if (type == RE_FIT_TYPE) {
|
| 1399 | |
| 1400 | * Split right edge of fit VA.
|
| 1401 | *
|
| 1402 | * | |
|
| 1403 | * L V NVA V
|
| 1404 | * |-------|-------|
|
| 1405 |
|
| 1406 | va->va_end = nva_start_addr;
|
| 1407 | } else if (type == NE_FIT_TYPE) {
|
| 1408 | |
| 1409 | * Split no edge of fit VA.
|
| 1410 | *
|
| 1411 | * | |
|
| 1412 | * L V NVA V R
|
| 1413 | * |---|-------|---|
|
| 1414 |
|
| 1415 | lva = __this_cpu_xchg(ne_fit_preload_node, NULL);
|
| 1416 | if (unlikely(!lva)) {
|
| 1417 | |
| 1418 | * For percpu allocator we do not do any pre-allocation
|
| 1419 | * and leave it as it is. The reason is it most likely
|
| 1420 | * never ends up with NE_FIT_TYPE splitting. In case of
|
| 1421 | * percpu allocations offsets and sizes are aligned to
|
| 1422 | * fixed align request, i.e. RE_FIT_TYPE and FL_FIT_TYPE
|
| 1423 | * are its main fitting cases.
|
| 1424 | *
|
| 1425 | * There are a few exceptions though, as an example it is
|
| 1426 | * a first allocation (early boot up) when we have "one"
|
| 1427 | * big free space that has to be split.
|
| 1428 | *
|
| 1429 | * Also we can hit this path in case of regular "vmap"
|
| 1430 | * allocations, if "this" current CPU was not preloaded.
|
| 1431 | * See the comment in alloc_vmap_area() why. If so, then
|
| 1432 | * GFP_NOWAIT is used instead to get an extra object for
|
| 1433 | * split purpose. That is rare and most time does not
|
| 1434 | * occur.
|
| 1435 | *
|
| 1436 | * What happens if an allocation gets failed. Basically,
|
| 1437 | * an "overflow" path is triggered to purge lazily freed
|
| 1438 | * areas to free some memory, then, the "retry" path is
|
| 1439 | * triggered to repeat one more time. See more details
|
| 1440 | * in alloc_vmap_area() function.
|
| 1441 |
|
| 1442 | lva = kmem_cache_alloc(vmap_area_cachep, GFP_NOWAIT);
|
| 1443 | if (!lva)
|
| 1444 | return -1;
|
| 1445 | }
|
| 1446 |
|
| 1447 | |
| 1448 | * Build the remainder.
|
| 1449 |
|
| 1450 | lva->va_start = va->va_start;
|
| 1451 | lva->va_end = nva_start_addr;
|
| 1452 |
|
| 1453 | |
| 1454 | * Shrink this VA to remaining size.
|
| 1455 |
|
| 1456 | va->va_start = nva_start_addr + size;
|
| 1457 | } else {
|
| 1458 | return -1;
|
| 1459 | }
|
| 1460 |
|
| 1461 | if (type != FL_FIT_TYPE) {
|
| 1462 | augment_tree_propagate_from(va);
|
| 1463 |
|
| 1464 | if (lva)
|
| 1465 | insert_vmap_area_augment(lva, &va->rb_node, root, head);
|
| 1466 | }
|
| 1467 |
|
| 1468 | return 0;
|
| 1469 | }
|
| 1470 |
|
| 1471 | |
| 1472 | * Returns a start address of the newly allocated area, if success.
|
| 1473 | * Otherwise a vend is returned that indicates failure.
|
| 1474 |
|
| 1475 | static __always_inline unsigned long
|
| 1476 | __alloc_vmap_area(struct rb_root *root, struct list_head *head,
|
| 1477 | unsigned long size, unsigned long align,
|
| 1478 | unsigned long vstart, unsigned long vend)
|
| 1479 | {
|
| 1480 | bool adjust_search_size = true;
|
| 1481 | unsigned long nva_start_addr;
|
| 1482 | struct vmap_area *va;
|
| 1483 | int ret;
|
| 1484 |
|
| 1485 | |
| 1486 | * Do not adjust when:
|
| 1487 | * a) align <= PAGE_SIZE, because it does not make any sense.
|
| 1488 | * All blocks(their start addresses) are at least PAGE_SIZE
|
| 1489 | * aligned anyway;
|
| 1490 | * b) a short range where a requested size corresponds to exactly
|
| 1491 | * specified [vstart:vend] interval and an alignment > PAGE_SIZE.
|
| 1492 | * With adjusted search length an allocation would not succeed.
|
| 1493 |
|
| 1494 | if (align <= PAGE_SIZE || (align > PAGE_SIZE && (vend - vstart) == size))
|
| 1495 | adjust_search_size = false;
|
| 1496 |
|
| 1497 | va = find_vmap_lowest_match(root, size, align, vstart, adjust_search_size);
|
| 1498 | if (unlikely(!va))
|
| 1499 | return vend;
|
| 1500 |
|
| 1501 | if (va->va_start > vstart)
|
| 1502 | nva_start_addr = ALIGN(va->va_start, align);
|
| 1503 | else
|
| 1504 | nva_start_addr = ALIGN(vstart, align);
|
| 1505 |
|
| 1506 |
|
| 1507 | if (nva_start_addr + size > vend)
|
| 1508 | return vend;
|
| 1509 |
|
| 1510 |
|
| 1511 | ret = adjust_va_to_fit_type(root, head, va, nva_start_addr, size);
|
| 1512 | if (WARN_ON_ONCE(ret))
|
| 1513 | return vend;
|
| 1514 |
|
| 1515 | #if DEBUG_AUGMENT_LOWEST_MATCH_CHECK
|
| 1516 | find_vmap_lowest_match_check(size, align);
|
| 1517 | #endif
|
| 1518 |
|
| 1519 | return nva_start_addr;
|
| 1520 | }
|
| 1521 |
|
| 1522 | |
| 1523 | * Free a region of KVA allocated by alloc_vmap_area
|
| 1524 |
|
| 1525 | static void free_vmap_area(struct vmap_area *va)
|
| 1526 | {
|
| 1527 | |
| 1528 | * Remove from the busy tree/list.
|
| 1529 |
|
| 1530 | spin_lock(&vmap_area_lock);
|
| 1531 | unlink_va(va, &vmap_area_root);
|
| 1532 | spin_unlock(&vmap_area_lock);
|
| 1533 |
|
| 1534 | |
| 1535 | * Insert/Merge it back to the free tree/list.
|
| 1536 |
|
| 1537 | spin_lock(&free_vmap_area_lock);
|
| 1538 | merge_or_add_vmap_area_augment(va, &free_vmap_area_root, &free_vmap_area_list);
|
| 1539 | spin_unlock(&free_vmap_area_lock);
|
| 1540 | }
|
| 1541 |
|
| 1542 | static inline void
|
| 1543 | preload_this_cpu_lock(spinlock_t *lock, gfp_t gfp_mask, int node)
|
| 1544 | {
|
| 1545 | struct vmap_area *va = NULL;
|
| 1546 |
|
| 1547 | |
| 1548 | * Preload this CPU with one extra vmap_area object. It is used
|
| 1549 | * when fit type of free area is NE_FIT_TYPE. It guarantees that
|
| 1550 | * a CPU that does an allocation is preloaded.
|
| 1551 | *
|
| 1552 | * We do it in non-atomic context, thus it allows us to use more
|
| 1553 | * permissive allocation masks to be more stable under low memory
|
| 1554 | * condition and high memory pressure.
|
| 1555 |
|
| 1556 | if (!this_cpu_read(ne_fit_preload_node))
|
| 1557 | va = kmem_cache_alloc_node(vmap_area_cachep, gfp_mask, node);
|
| 1558 |
|
| 1559 | spin_lock(lock);
|
| 1560 |
|
| 1561 | if (va && __this_cpu_cmpxchg(ne_fit_preload_node, NULL, va))
|
| 1562 | kmem_cache_free(vmap_area_cachep, va);
|
| 1563 | }
|
| 1564 |
|
| 1565 | |
| 1566 | * Allocate a region of KVA of the specified size and alignment, within the
|
| 1567 | * vstart and vend.
|
| 1568 |
|
| 1569 | static struct vmap_area *alloc_vmap_area(unsigned long size,
|
| 1570 | unsigned long align,
|
| 1571 | unsigned long vstart, unsigned long vend,
|
| 1572 | int node, gfp_t gfp_mask)
|
| 1573 | {
|
| 1574 | struct vmap_area *va;
|
| 1575 | unsigned long freed;
|
| 1576 | unsigned long addr;
|
| 1577 | int purged = 0;
|
| 1578 | int ret;
|
| 1579 |
|
| 1580 | BUG_ON(!size);
|
| 1581 | BUG_ON(offset_in_page(size));
|
| 1582 | BUG_ON(!is_power_of_2(align));
|
| 1583 |
|
| 1584 | if (unlikely(!vmap_initialized))
|
| 1585 | return ERR_PTR(-EBUSY);
|
| 1586 |
|
| 1587 | might_sleep();
|
| 1588 | gfp_mask = gfp_mask & GFP_RECLAIM_MASK;
|
| 1589 |
|
| 1590 | va = kmem_cache_alloc_node(vmap_area_cachep, gfp_mask, node);
|
| 1591 | if (unlikely(!va))
|
| 1592 | return ERR_PTR(-ENOMEM);
|
| 1593 |
|
| 1594 | |
| 1595 | * Only scan the relevant parts containing pointers to other objects
|
| 1596 | * to avoid false negatives.
|
| 1597 |
|
| 1598 | kmemleak_scan_area(&va->rb_node, SIZE_MAX, gfp_mask);
|
| 1599 |
|
| 1600 | retry:
|
| 1601 | preload_this_cpu_lock(&free_vmap_area_lock, gfp_mask, node);
|
| 1602 | addr = __alloc_vmap_area(&free_vmap_area_root, &free_vmap_area_list,
|
| 1603 | size, align, vstart, vend);
|
| 1604 | spin_unlock(&free_vmap_area_lock);
|
| 1605 |
|
| 1606 | |
| 1607 | * If an allocation fails, the "vend" address is
|
| 1608 | * returned. Therefore trigger the overflow path.
|
| 1609 |
|
| 1610 | if (unlikely(addr == vend))
|
| 1611 | goto overflow;
|
| 1612 |
|
| 1613 | va->va_start = addr;
|
| 1614 | va->va_end = addr + size;
|
| 1615 | va->vm = NULL;
|
| 1616 |
|
| 1617 | spin_lock(&vmap_area_lock);
|
| 1618 | insert_vmap_area(va, &vmap_area_root, &vmap_area_list);
|
| 1619 | spin_unlock(&vmap_area_lock);
|
| 1620 |
|
| 1621 | BUG_ON(!IS_ALIGNED(va->va_start, align));
|
| 1622 | BUG_ON(va->va_start < vstart);
|
| 1623 | BUG_ON(va->va_end > vend);
|
| 1624 |
|
| 1625 | ret = kasan_populate_vmalloc(addr, size);
|
| 1626 | if (ret) {
|
| 1627 | free_vmap_area(va);
|
| 1628 | return ERR_PTR(ret);
|
| 1629 | }
|
| 1630 |
|
| 1631 | return va;
|
| 1632 |
|
| 1633 | overflow:
|
| 1634 | if (!purged) {
|
| 1635 | purge_vmap_area_lazy();
|
| 1636 | purged = 1;
|
| 1637 | goto retry;
|
| 1638 | }
|
| 1639 |
|
| 1640 | freed = 0;
|
| 1641 | blocking_notifier_call_chain(&vmap_notify_list, 0, &freed);
|
| 1642 |
|
| 1643 | if (freed > 0) {
|
| 1644 | purged = 0;
|
| 1645 | goto retry;
|
| 1646 | }
|
| 1647 |
|
| 1648 | if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit())
|
| 1649 | pr_warn("vmap allocation for size %lu failed: use vmalloc=<size> to increase size\n",
|
| 1650 | size);
|
| 1651 |
|
| 1652 | kmem_cache_free(vmap_area_cachep, va);
|
| 1653 | return ERR_PTR(-EBUSY);
|
| 1654 | }
|
| 1655 |
|
| 1656 | int register_vmap_purge_notifier(struct notifier_block *nb)
|
| 1657 | {
|
| 1658 | return blocking_notifier_chain_register(&vmap_notify_list, nb);
|
| 1659 | }
|
| 1660 | EXPORT_SYMBOL_GPL(register_vmap_purge_notifier);
|
| 1661 |
|
| 1662 | int unregister_vmap_purge_notifier(struct notifier_block *nb)
|
| 1663 | {
|
| 1664 | return blocking_notifier_chain_unregister(&vmap_notify_list, nb);
|
| 1665 | }
|
| 1666 | EXPORT_SYMBOL_GPL(unregister_vmap_purge_notifier);
|
| 1667 |
|
| 1668 | |
| 1669 | * lazy_max_pages is the maximum amount of virtual address space we gather up
|
| 1670 | * before attempting to purge with a TLB flush.
|
| 1671 | *
|
| 1672 | * There is a tradeoff here: a larger number will cover more kernel page tables
|
| 1673 | * and take slightly longer to purge, but it will linearly reduce the number of
|
| 1674 | * global TLB flushes that must be performed. It would seem natural to scale
|
| 1675 | * this number up linearly with the number of CPUs (because vmapping activity
|
| 1676 | * could also scale linearly with the number of CPUs), however it is likely
|
| 1677 | * that in practice, workloads might be constrained in other ways that mean
|
| 1678 | * vmap activity will not scale linearly with CPUs. Also, I want to be
|
| 1679 | * conservative and not introduce a big latency on huge systems, so go with
|
| 1680 | * a less aggressive log scale. It will still be an improvement over the old
|
| 1681 | * code, and it will be simple to change the scale factor if we find that it
|
| 1682 | * becomes a problem on bigger systems.
|
| 1683 |
|
| 1684 | static unsigned long lazy_max_pages(void)
|
| 1685 | {
|
| 1686 | unsigned int log;
|
| 1687 |
|
| 1688 | log = fls(num_online_cpus());
|
| 1689 |
|
| 1690 | return log * (32UL * 1024 * 1024 / PAGE_SIZE);
|
| 1691 | }
|
| 1692 |
|
| 1693 | static atomic_long_t vmap_lazy_nr = ATOMIC_LONG_INIT(0);
|
| 1694 |
|
| 1695 | |
| 1696 | * Serialize vmap purging. There is no actual critical section protected
|
| 1697 | * by this lock, but we want to avoid concurrent calls for performance
|
| 1698 | * reasons and to make the pcpu_get_vm_areas more deterministic.
|
| 1699 |
|
| 1700 | static DEFINE_MUTEX(vmap_purge_lock);
|
| 1701 |
|
| 1702 |
|
| 1703 | static void purge_fragmented_blocks_allcpus(void);
|
| 1704 |
|
| 1705 | |
| 1706 | * Purges all lazily-freed vmap areas.
|
| 1707 |
|
| 1708 | static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)
|
| 1709 | {
|
| 1710 | unsigned long resched_threshold;
|
| 1711 | struct list_head local_purge_list;
|
| 1712 | struct vmap_area *va, *n_va;
|
| 1713 |
|
| 1714 | lockdep_assert_held(&vmap_purge_lock);
|
| 1715 |
|
| 1716 | spin_lock(&purge_vmap_area_lock);
|
| 1717 | purge_vmap_area_root = RB_ROOT;
|
| 1718 | list_replace_init(&purge_vmap_area_list, &local_purge_list);
|
| 1719 | spin_unlock(&purge_vmap_area_lock);
|
| 1720 |
|
| 1721 | if (unlikely(list_empty(&local_purge_list)))
|
| 1722 | return false;
|
| 1723 |
|
| 1724 | start = min(start,
|
| 1725 | list_first_entry(&local_purge_list,
|
| 1726 | struct vmap_area, list)->va_start);
|
| 1727 |
|
| 1728 | end = max(end,
|
| 1729 | list_last_entry(&local_purge_list,
|
| 1730 | struct vmap_area, list)->va_end);
|
| 1731 |
|
| 1732 | flush_tlb_kernel_range(start, end);
|
| 1733 | resched_threshold = lazy_max_pages() << 1;
|
| 1734 |
|
| 1735 | spin_lock(&free_vmap_area_lock);
|
| 1736 | list_for_each_entry_safe(va, n_va, &local_purge_list, list) {
|
| 1737 | unsigned long nr = (va->va_end - va->va_start) >> PAGE_SHIFT;
|
| 1738 | unsigned long orig_start = va->va_start;
|
| 1739 | unsigned long orig_end = va->va_end;
|
| 1740 |
|
| 1741 | |
| 1742 | * Finally insert or merge lazily-freed area. It is
|
| 1743 | * detached and there is no need to "unlink" it from
|
| 1744 | * anything.
|
| 1745 |
|
| 1746 | va = merge_or_add_vmap_area_augment(va, &free_vmap_area_root,
|
| 1747 | &free_vmap_area_list);
|
| 1748 |
|
| 1749 | if (!va)
|
| 1750 | continue;
|
| 1751 |
|
| 1752 | if (is_vmalloc_or_module_addr((void *)orig_start))
|
| 1753 | kasan_release_vmalloc(orig_start, orig_end,
|
| 1754 | va->va_start, va->va_end);
|
| 1755 |
|
| 1756 | atomic_long_sub(nr, &vmap_lazy_nr);
|
| 1757 |
|
| 1758 | if (atomic_long_read(&vmap_lazy_nr) < resched_threshold)
|
| 1759 | cond_resched_lock(&free_vmap_area_lock);
|
| 1760 | }
|
| 1761 | spin_unlock(&free_vmap_area_lock);
|
| 1762 | return true;
|
| 1763 | }
|
| 1764 |
|
| 1765 | |
| 1766 | * Kick off a purge of the outstanding lazy areas.
|
| 1767 |
|
| 1768 | static void purge_vmap_area_lazy(void)
|
| 1769 | {
|
| 1770 | mutex_lock(&vmap_purge_lock);
|
| 1771 | purge_fragmented_blocks_allcpus();
|
| 1772 | __purge_vmap_area_lazy(ULONG_MAX, 0);
|
| 1773 | mutex_unlock(&vmap_purge_lock);
|
| 1774 | }
|
| 1775 |
|
| 1776 | static void drain_vmap_area_work(struct work_struct *work)
|
| 1777 | {
|
| 1778 | unsigned long nr_lazy;
|
| 1779 |
|
| 1780 | do {
|
| 1781 | mutex_lock(&vmap_purge_lock);
|
| 1782 | __purge_vmap_area_lazy(ULONG_MAX, 0);
|
| 1783 | mutex_unlock(&vmap_purge_lock);
|
| 1784 |
|
| 1785 |
|
| 1786 | nr_lazy = atomic_long_read(&vmap_lazy_nr);
|
| 1787 | } while (nr_lazy > lazy_max_pages());
|
| 1788 | }
|
| 1789 |
|
| 1790 | |
| 1791 | * Free a vmap area, caller ensuring that the area has been unmapped
|
| 1792 | * and flush_cache_vunmap had been called for the correct range
|
| 1793 | * previously.
|
| 1794 |
|
| 1795 | static void free_vmap_area_noflush(struct vmap_area *va)
|
| 1796 | {
|
| 1797 | unsigned long nr_lazy;
|
| 1798 |
|
| 1799 | spin_lock(&vmap_area_lock);
|
| 1800 | unlink_va(va, &vmap_area_root);
|
| 1801 | spin_unlock(&vmap_area_lock);
|
| 1802 |
|
| 1803 | nr_lazy = atomic_long_add_return((va->va_end - va->va_start) >>
|
| 1804 | PAGE_SHIFT, &vmap_lazy_nr);
|
| 1805 |
|
| 1806 | |
| 1807 | * Merge or place it to the purge tree/list.
|
| 1808 |
|
| 1809 | spin_lock(&purge_vmap_area_lock);
|
| 1810 | merge_or_add_vmap_area(va,
|
| 1811 | &purge_vmap_area_root, &purge_vmap_area_list);
|
| 1812 | spin_unlock(&purge_vmap_area_lock);
|
| 1813 |
|
| 1814 |
|
| 1815 | if (unlikely(nr_lazy > lazy_max_pages()))
|
| 1816 | schedule_work(&drain_vmap_work);
|
| 1817 | }
|
| 1818 |
|
| 1819 | |
| 1820 | * Free and unmap a vmap area
|
| 1821 |
|
| 1822 | static void free_unmap_vmap_area(struct vmap_area *va)
|
| 1823 | {
|
| 1824 | flush_cache_vunmap(va->va_start, va->va_end);
|
| 1825 | vunmap_range_noflush(va->va_start, va->va_end);
|
| 1826 | if (debug_pagealloc_enabled_static())
|
| 1827 | flush_tlb_kernel_range(va->va_start, va->va_end);
|
| 1828 |
|
| 1829 | free_vmap_area_noflush(va);
|
| 1830 | }
|
| 1831 |
|
| 1832 | struct vmap_area *find_vmap_area(unsigned long addr)
|
| 1833 | {
|
| 1834 | struct vmap_area *va;
|
| 1835 |
|
| 1836 | spin_lock(&vmap_area_lock);
|
| 1837 | va = __find_vmap_area(addr, &vmap_area_root);
|
| 1838 | spin_unlock(&vmap_area_lock);
|
| 1839 |
|
| 1840 | return va;
|
| 1841 | }
|
| 1842 |
|
| 1843 |
|
| 1844 |
|
| 1845 | |
| 1846 | * vmap space is limited especially on 32 bit architectures. Ensure there is
|
| 1847 | * room for at least 16 percpu vmap blocks per CPU.
|
| 1848 |
|
| 1849 | |
| 1850 | * If we had a constant VMALLOC_START and VMALLOC_END, we'd like to be able
|
| 1851 | * to #define VMALLOC_SPACE (VMALLOC_END-VMALLOC_START). Guess
|
| 1852 | * instead (we just need a rough idea)
|
| 1853 |
|
| 1854 | #if BITS_PER_LONG == 32
|
| 1855 | #define VMALLOC_SPACE (128UL*1024*1024)
|
| 1856 | #else
|
| 1857 | #define VMALLOC_SPACE (128UL*1024*1024*1024)
|
| 1858 | #endif
|
| 1859 |
|
| 1860 | #define VMALLOC_PAGES (VMALLOC_SPACE / PAGE_SIZE)
|
| 1861 | #define VMAP_MAX_ALLOC BITS_PER_LONG
|
| 1862 | #define VMAP_BBMAP_BITS_MAX 1024
|
| 1863 | #define VMAP_BBMAP_BITS_MIN (VMAP_MAX_ALLOC*2)
|
| 1864 | #define VMAP_MIN(x, y) ((x) < (y) ? (x) : (y))
|
| 1865 | #define VMAP_MAX(x, y) ((x) > (y) ? (x) : (y))
|
| 1866 | #define VMAP_BBMAP_BITS \
|
| 1867 | VMAP_MIN(VMAP_BBMAP_BITS_MAX, \
|
| 1868 | VMAP_MAX(VMAP_BBMAP_BITS_MIN, \
|
| 1869 | VMALLOC_PAGES / roundup_pow_of_two(NR_CPUS) / 16))
|
| 1870 |
|
| 1871 | #define VMAP_BLOCK_SIZE (VMAP_BBMAP_BITS * PAGE_SIZE)
|
| 1872 |
|
| 1873 | struct vmap_block_queue {
|
| 1874 | spinlock_t lock;
|
| 1875 | struct list_head free;
|
| 1876 | };
|
| 1877 |
|
| 1878 | struct vmap_block {
|
| 1879 | spinlock_t lock;
|
| 1880 | struct vmap_area *va;
|
| 1881 | unsigned long free, dirty;
|
| 1882 | unsigned long dirty_min, dirty_max;
|
| 1883 | struct list_head free_list;
|
| 1884 | struct rcu_head rcu_head;
|
| 1885 | struct list_head purge;
|
| 1886 | };
|
| 1887 |
|
| 1888 |
|
| 1889 | static DEFINE_PER_CPU(struct vmap_block_queue, vmap_block_queue);
|
| 1890 |
|
| 1891 | |
| 1892 | * XArray of vmap blocks, indexed by address, to quickly find a vmap block
|
| 1893 | * in the free path. Could get rid of this if we change the API to return a
|
| 1894 | * "cookie" from alloc, to be passed to free. But no big deal yet.
|
| 1895 |
|
| 1896 | static DEFINE_XARRAY(vmap_blocks);
|
| 1897 |
|
| 1898 | |
| 1899 | * We should probably have a fallback mechanism to allocate virtual memory
|
| 1900 | * out of partially filled vmap blocks. However vmap block sizing should be
|
| 1901 | * fairly reasonable according to the vmalloc size, so it shouldn't be a
|
| 1902 | * big problem.
|
| 1903 |
|
| 1904 |
|
| 1905 | static unsigned long addr_to_vb_idx(unsigned long addr)
|
| 1906 | {
|
| 1907 | addr -= VMALLOC_START & ~(VMAP_BLOCK_SIZE-1);
|
| 1908 | addr /= VMAP_BLOCK_SIZE;
|
| 1909 | return addr;
|
| 1910 | }
|
| 1911 |
|
| 1912 | static void *vmap_block_vaddr(unsigned long va_start, unsigned long pages_off)
|
| 1913 | {
|
| 1914 | unsigned long addr;
|
| 1915 |
|
| 1916 | addr = va_start + (pages_off << PAGE_SHIFT);
|
| 1917 | BUG_ON(addr_to_vb_idx(addr) != addr_to_vb_idx(va_start));
|
| 1918 | return (void *)addr;
|
| 1919 | }
|
| 1920 |
|
| 1921 | |
| 1922 | * new_vmap_block - allocates new vmap_block and occupies 2^order pages in this
|
| 1923 | * block. Of course pages number can't exceed VMAP_BBMAP_BITS
|
| 1924 | * @order: how many 2^order pages should be occupied in newly allocated block
|
| 1925 | * @gfp_mask: flags for the page level allocator
|
| 1926 | *
|
| 1927 | * Return: virtual address in a newly allocated block or ERR_PTR(-errno)
|
| 1928 |
|
| 1929 | static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
|
| 1930 | {
|
| 1931 | struct vmap_block_queue *vbq;
|
| 1932 | struct vmap_block *vb;
|
| 1933 | struct vmap_area *va;
|
| 1934 | unsigned long vb_idx;
|
| 1935 | int node, err;
|
| 1936 | void *vaddr;
|
| 1937 |
|
| 1938 | node = numa_node_id();
|
| 1939 |
|
| 1940 | vb = kmalloc_node(sizeof(struct vmap_block),
|
| 1941 | gfp_mask & GFP_RECLAIM_MASK, node);
|
| 1942 | if (unlikely(!vb))
|
| 1943 | return ERR_PTR(-ENOMEM);
|
| 1944 |
|
| 1945 | va = alloc_vmap_area(VMAP_BLOCK_SIZE, VMAP_BLOCK_SIZE,
|
| 1946 | VMALLOC_START, VMALLOC_END,
|
| 1947 | node, gfp_mask);
|
| 1948 | if (IS_ERR(va)) {
|
| 1949 | kfree(vb);
|
| 1950 | return ERR_CAST(va);
|
| 1951 | }
|
| 1952 |
|
| 1953 | vaddr = vmap_block_vaddr(va->va_start, 0);
|
| 1954 | spin_lock_init(&vb->lock);
|
| 1955 | vb->va = va;
|
| 1956 |
|
| 1957 | BUG_ON(VMAP_BBMAP_BITS <= (1UL << order));
|
| 1958 | vb->free = VMAP_BBMAP_BITS - (1UL << order);
|
| 1959 | vb->dirty = 0;
|
| 1960 | vb->dirty_min = VMAP_BBMAP_BITS;
|
| 1961 | vb->dirty_max = 0;
|
| 1962 | INIT_LIST_HEAD(&vb->free_list);
|
| 1963 |
|
| 1964 | vb_idx = addr_to_vb_idx(va->va_start);
|
| 1965 | err = xa_insert(&vmap_blocks, vb_idx, vb, gfp_mask);
|
| 1966 | if (err) {
|
| 1967 | kfree(vb);
|
| 1968 | free_vmap_area(va);
|
| 1969 | return ERR_PTR(err);
|
| 1970 | }
|
| 1971 |
|
| 1972 | vbq = raw_cpu_ptr(&vmap_block_queue);
|
| 1973 | spin_lock(&vbq->lock);
|
| 1974 | list_add_tail_rcu(&vb->free_list, &vbq->free);
|
| 1975 | spin_unlock(&vbq->lock);
|
| 1976 |
|
| 1977 | return vaddr;
|
| 1978 | }
|
| 1979 |
|
| 1980 | static void free_vmap_block(struct vmap_block *vb)
|
| 1981 | {
|
| 1982 | struct vmap_block *tmp;
|
| 1983 |
|
| 1984 | tmp = xa_erase(&vmap_blocks, addr_to_vb_idx(vb->va->va_start));
|
| 1985 | BUG_ON(tmp != vb);
|
| 1986 |
|
| 1987 | free_vmap_area_noflush(vb->va);
|
| 1988 | kfree_rcu(vb, rcu_head);
|
| 1989 | }
|
| 1990 |
|
| 1991 | static void purge_fragmented_blocks(int cpu)
|
| 1992 | {
|
| 1993 | LIST_HEAD(purge);
|
| 1994 | struct vmap_block *vb;
|
| 1995 | struct vmap_block *n_vb;
|
| 1996 | struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);
|
| 1997 |
|
| 1998 | rcu_read_lock();
|
| 1999 | list_for_each_entry_rcu(vb, &vbq->free, free_list) {
|
| 2000 |
|
| 2001 | if (!(vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS))
|
| 2002 | continue;
|
| 2003 |
|
| 2004 | spin_lock(&vb->lock);
|
| 2005 | if (vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS) {
|
| 2006 | vb->free = 0;
|
| 2007 | vb->dirty = VMAP_BBMAP_BITS;
|
| 2008 | vb->dirty_min = 0;
|
| 2009 | vb->dirty_max = VMAP_BBMAP_BITS;
|
| 2010 | spin_lock(&vbq->lock);
|
| 2011 | list_del_rcu(&vb->free_list);
|
| 2012 | spin_unlock(&vbq->lock);
|
| 2013 | spin_unlock(&vb->lock);
|
| 2014 | list_add_tail(&vb->purge, &purge);
|
| 2015 | } else
|
| 2016 | spin_unlock(&vb->lock);
|
| 2017 | }
|
| 2018 | rcu_read_unlock();
|
| 2019 |
|
| 2020 | list_for_each_entry_safe(vb, n_vb, &purge, purge) {
|
| 2021 | list_del(&vb->purge);
|
| 2022 | free_vmap_block(vb);
|
| 2023 | }
|
| 2024 | }
|
| 2025 |
|
| 2026 | static void purge_fragmented_blocks_allcpus(void)
|
| 2027 | {
|
| 2028 | int cpu;
|
| 2029 |
|
| 2030 | for_each_possible_cpu(cpu)
|
| 2031 | purge_fragmented_blocks(cpu);
|
| 2032 | }
|
| 2033 |
|
| 2034 | static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
|
| 2035 | {
|
| 2036 | struct vmap_block_queue *vbq;
|
| 2037 | struct vmap_block *vb;
|
| 2038 | void *vaddr = NULL;
|
| 2039 | unsigned int order;
|
| 2040 |
|
| 2041 | BUG_ON(offset_in_page(size));
|
| 2042 | BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
|
| 2043 | if (WARN_ON(size == 0)) {
|
| 2044 | |
| 2045 | * Allocating 0 bytes isn't what caller wants since
|
| 2046 | * get_order(0) returns funny result. Just warn and terminate
|
| 2047 | * early.
|
| 2048 |
|
| 2049 | return NULL;
|
| 2050 | }
|
| 2051 | order = get_order(size);
|
| 2052 |
|
| 2053 | rcu_read_lock();
|
| 2054 | vbq = raw_cpu_ptr(&vmap_block_queue);
|
| 2055 | list_for_each_entry_rcu(vb, &vbq->free, free_list) {
|
| 2056 | unsigned long pages_off;
|
| 2057 |
|
| 2058 | spin_lock(&vb->lock);
|
| 2059 | if (vb->free < (1UL << order)) {
|
| 2060 | spin_unlock(&vb->lock);
|
| 2061 | continue;
|
| 2062 | }
|
| 2063 |
|
| 2064 | pages_off = VMAP_BBMAP_BITS - vb->free;
|
| 2065 | vaddr = vmap_block_vaddr(vb->va->va_start, pages_off);
|
| 2066 | vb->free -= 1UL << order;
|
| 2067 | if (vb->free == 0) {
|
| 2068 | spin_lock(&vbq->lock);
|
| 2069 | list_del_rcu(&vb->free_list);
|
| 2070 | spin_unlock(&vbq->lock);
|
| 2071 | }
|
| 2072 |
|
| 2073 | spin_unlock(&vb->lock);
|
| 2074 | break;
|
| 2075 | }
|
| 2076 |
|
| 2077 | rcu_read_unlock();
|
| 2078 |
|
| 2079 |
|
| 2080 | if (!vaddr)
|
| 2081 | vaddr = new_vmap_block(order, gfp_mask);
|
| 2082 |
|
| 2083 | return vaddr;
|
| 2084 | }
|
| 2085 |
|
| 2086 | static void vb_free(unsigned long addr, unsigned long size)
|
| 2087 | {
|
| 2088 | unsigned long offset;
|
| 2089 | unsigned int order;
|
| 2090 | struct vmap_block *vb;
|
| 2091 |
|
| 2092 | BUG_ON(offset_in_page(size));
|
| 2093 | BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
|
| 2094 |
|
| 2095 | flush_cache_vunmap(addr, addr + size);
|
| 2096 |
|
| 2097 | order = get_order(size);
|
| 2098 | offset = (addr & (VMAP_BLOCK_SIZE - 1)) >> PAGE_SHIFT;
|
| 2099 | vb = xa_load(&vmap_blocks, addr_to_vb_idx(addr));
|
| 2100 |
|
| 2101 | vunmap_range_noflush(addr, addr + size);
|
| 2102 |
|
| 2103 | if (debug_pagealloc_enabled_static())
|
| 2104 | flush_tlb_kernel_range(addr, addr + size);
|
| 2105 |
|
| 2106 | spin_lock(&vb->lock);
|
| 2107 |
|
| 2108 |
|
| 2109 | vb->dirty_min = min(vb->dirty_min, offset);
|
| 2110 | vb->dirty_max = max(vb->dirty_max, offset + (1UL << order));
|
| 2111 |
|
| 2112 | vb->dirty += 1UL << order;
|
| 2113 | if (vb->dirty == VMAP_BBMAP_BITS) {
|
| 2114 | BUG_ON(vb->free);
|
| 2115 | spin_unlock(&vb->lock);
|
| 2116 | free_vmap_block(vb);
|
| 2117 | } else
|
| 2118 | spin_unlock(&vb->lock);
|
| 2119 | }
|
| 2120 |
|
| 2121 | static void _vm_unmap_aliases(unsigned long start, unsigned long end, int flush)
|
| 2122 | {
|
| 2123 | int cpu;
|
| 2124 |
|
| 2125 | if (unlikely(!vmap_initialized))
|
| 2126 | return;
|
| 2127 |
|
| 2128 | might_sleep();
|
| 2129 |
|
| 2130 | for_each_possible_cpu(cpu) {
|
| 2131 | struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);
|
| 2132 | struct vmap_block *vb;
|
| 2133 |
|
| 2134 | rcu_read_lock();
|
| 2135 | list_for_each_entry_rcu(vb, &vbq->free, free_list) {
|
| 2136 | spin_lock(&vb->lock);
|
| 2137 | if (vb->dirty && vb->dirty != VMAP_BBMAP_BITS) {
|
| 2138 | unsigned long va_start = vb->va->va_start;
|
| 2139 | unsigned long s, e;
|
| 2140 |
|
| 2141 | s = va_start + (vb->dirty_min << PAGE_SHIFT);
|
| 2142 | e = va_start + (vb->dirty_max << PAGE_SHIFT);
|
| 2143 |
|
| 2144 | start = min(s, start);
|
| 2145 | end = max(e, end);
|
| 2146 |
|
| 2147 | flush = 1;
|
| 2148 | }
|
| 2149 | spin_unlock(&vb->lock);
|
| 2150 | }
|
| 2151 | rcu_read_unlock();
|
| 2152 | }
|
| 2153 |
|
| 2154 | mutex_lock(&vmap_purge_lock);
|
| 2155 | purge_fragmented_blocks_allcpus();
|
| 2156 | if (!__purge_vmap_area_lazy(start, end) && flush)
|
| 2157 | flush_tlb_kernel_range(start, end);
|
| 2158 | mutex_unlock(&vmap_purge_lock);
|
| 2159 | }
|
| 2160 |
|
| 2161 | |
| 2162 | * vm_unmap_aliases - unmap outstanding lazy aliases in the vmap layer
|
| 2163 | *
|
| 2164 | * The vmap/vmalloc layer lazily flushes kernel virtual mappings primarily
|
| 2165 | * to amortize TLB flushing overheads. What this means is that any page you
|
| 2166 | * have now, may, in a former life, have been mapped into kernel virtual
|
| 2167 | * address by the vmap layer and so there might be some CPUs with TLB entries
|
| 2168 | * still referencing that page (additional to the regular 1:1 kernel mapping).
|
| 2169 | *
|
| 2170 | * vm_unmap_aliases flushes all such lazy mappings. After it returns, we can
|
| 2171 | * be sure that none of the pages we have control over will have any aliases
|
| 2172 | * from the vmap layer.
|
| 2173 |
|
| 2174 | void vm_unmap_aliases(void)
|
| 2175 | {
|
| 2176 | unsigned long start = ULONG_MAX, end = 0;
|
| 2177 | int flush = 0;
|
| 2178 |
|
| 2179 | _vm_unmap_aliases(start, end, flush);
|
| 2180 | }
|
| 2181 | EXPORT_SYMBOL_GPL(vm_unmap_aliases);
|
| 2182 |
|
| 2183 | |
| 2184 | * vm_unmap_ram - unmap linear kernel address space set up by vm_map_ram
|
| 2185 | * @mem: the pointer returned by vm_map_ram
|
| 2186 | * @count: the count passed to that vm_map_ram call (cannot unmap partial)
|
| 2187 |
|
| 2188 | void vm_unmap_ram(const void *mem, unsigned int count)
|
| 2189 | {
|
| 2190 | unsigned long size = (unsigned long)count << PAGE_SHIFT;
|
| 2191 | unsigned long addr = (unsigned long)kasan_reset_tag(mem);
|
| 2192 | struct vmap_area *va;
|
| 2193 |
|
| 2194 | might_sleep();
|
| 2195 | BUG_ON(!addr);
|
| 2196 | BUG_ON(addr < VMALLOC_START);
|
| 2197 | BUG_ON(addr > VMALLOC_END);
|
| 2198 | BUG_ON(!PAGE_ALIGNED(addr));
|
| 2199 |
|
| 2200 | kasan_poison_vmalloc(mem, size);
|
| 2201 |
|
| 2202 | if (likely(count <= VMAP_MAX_ALLOC)) {
|
| 2203 | debug_check_no_locks_freed(mem, size);
|
| 2204 | vb_free(addr, size);
|
| 2205 | return;
|
| 2206 | }
|
| 2207 |
|
| 2208 | va = find_vmap_area(addr);
|
| 2209 | BUG_ON(!va);
|
| 2210 | debug_check_no_locks_freed((void *)va->va_start,
|
| 2211 | (va->va_end - va->va_start));
|
| 2212 | free_unmap_vmap_area(va);
|
| 2213 | }
|
| 2214 | EXPORT_SYMBOL(vm_unmap_ram);
|
| 2215 |
|
| 2216 | |
| 2217 | * vm_map_ram - map pages linearly into kernel virtual address (vmalloc space)
|
| 2218 | * @pages: an array of pointers to the pages to be mapped
|
| 2219 | * @count: number of pages
|
| 2220 | * @node: prefer to allocate data structures on this node
|
| 2221 | *
|
| 2222 | * If you use this function for less than VMAP_MAX_ALLOC pages, it could be
|
| 2223 | * faster than vmap so it's good. But if you mix long-life and short-life
|
| 2224 | * objects with vm_map_ram(), it could consume lots of address space through
|
| 2225 | * fragmentation (especially on a 32bit machine). You could see failures in
|
| 2226 | * the end. Please use this function for short-lived objects.
|
| 2227 | *
|
| 2228 | * Returns: a pointer to the address that has been mapped, or %NULL on failure
|
| 2229 |
|
| 2230 | void *vm_map_ram(struct page **pages, unsigned int count, int node)
|
| 2231 | {
|
| 2232 | unsigned long size = (unsigned long)count << PAGE_SHIFT;
|
| 2233 | unsigned long addr;
|
| 2234 | void *mem;
|
| 2235 |
|
| 2236 | if (likely(count <= VMAP_MAX_ALLOC)) {
|
| 2237 | mem = vb_alloc(size, GFP_KERNEL);
|
| 2238 | if (IS_ERR(mem))
|
| 2239 | return NULL;
|
| 2240 | addr = (unsigned long)mem;
|
| 2241 | } else {
|
| 2242 | struct vmap_area *va;
|
| 2243 | va = alloc_vmap_area(size, PAGE_SIZE,
|
| 2244 | VMALLOC_START, VMALLOC_END, node, GFP_KERNEL);
|
| 2245 | if (IS_ERR(va))
|
| 2246 | return NULL;
|
| 2247 |
|
| 2248 | addr = va->va_start;
|
| 2249 | mem = (void *)addr;
|
| 2250 | }
|
| 2251 |
|
| 2252 | if (vmap_pages_range(addr, addr + size, PAGE_KERNEL,
|
| 2253 | pages, PAGE_SHIFT) < 0) {
|
| 2254 | vm_unmap_ram(mem, count);
|
| 2255 | return NULL;
|
| 2256 | }
|
| 2257 |
|
| 2258 | |
| 2259 | * Mark the pages as accessible, now that they are mapped.
|
| 2260 | * With hardware tag-based KASAN, marking is skipped for
|
| 2261 | * non-VM_ALLOC mappings, see __kasan_unpoison_vmalloc().
|
| 2262 |
|
| 2263 | mem = kasan_unpoison_vmalloc(mem, size, KASAN_VMALLOC_PROT_NORMAL);
|
| 2264 |
|
| 2265 | return mem;
|
| 2266 | }
|
| 2267 | EXPORT_SYMBOL(vm_map_ram);
|
| 2268 |
|
| 2269 | static struct vm_struct *vmlist __initdata;
|
| 2270 |
|
| 2271 | static inline unsigned int vm_area_page_order(struct vm_struct *vm)
|
| 2272 | {
|
| 2273 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
|
| 2274 | return vm->page_order;
|
| 2275 | #else
|
| 2276 | return 0;
|
| 2277 | #endif
|
| 2278 | }
|
| 2279 |
|
| 2280 | static inline void set_vm_area_page_order(struct vm_struct *vm, unsigned int order)
|
| 2281 | {
|
| 2282 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
|
| 2283 | vm->page_order = order;
|
| 2284 | #else
|
| 2285 | BUG_ON(order != 0);
|
| 2286 | #endif
|
| 2287 | }
|
| 2288 |
|
| 2289 | |
| 2290 | * vm_area_add_early - add vmap area early during boot
|
| 2291 | * @vm: vm_struct to add
|
| 2292 | *
|
| 2293 | * This function is used to add fixed kernel vm area to vmlist before
|
| 2294 | * vmalloc_init() is called. @vm->addr, @vm->size, and @vm->flags
|
| 2295 | * should contain proper values and the other fields should be zero.
|
| 2296 | *
|
| 2297 | * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
|
| 2298 |
|
| 2299 | void __init vm_area_add_early(struct vm_struct *vm)
|
| 2300 | {
|
| 2301 | struct vm_struct *tmp, **p;
|
| 2302 |
|
| 2303 | BUG_ON(vmap_initialized);
|
| 2304 | for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) {
|
| 2305 | if (tmp->addr >= vm->addr) {
|
| 2306 | BUG_ON(tmp->addr < vm->addr + vm->size);
|
| 2307 | break;
|
| 2308 | } else
|
| 2309 | BUG_ON(tmp->addr + tmp->size > vm->addr);
|
| 2310 | }
|
| 2311 | vm->next = *p;
|
| 2312 | *p = vm;
|
| 2313 | }
|
| 2314 |
|
| 2315 | |
| 2316 | * vm_area_register_early - register vmap area early during boot
|
| 2317 | * @vm: vm_struct to register
|
| 2318 | * @align: requested alignment
|
| 2319 | *
|
| 2320 | * This function is used to register kernel vm area before
|
| 2321 | * vmalloc_init() is called. @vm->size and @vm->flags should contain
|
| 2322 | * proper values on entry and other fields should be zero. On return,
|
| 2323 | * vm->addr contains the allocated address.
|
| 2324 | *
|
| 2325 | * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
|
| 2326 |
|
| 2327 | void __init vm_area_register_early(struct vm_struct *vm, size_t align)
|
| 2328 | {
|
| 2329 | unsigned long addr = ALIGN(VMALLOC_START, align);
|
| 2330 | struct vm_struct *cur, **p;
|
| 2331 |
|
| 2332 | BUG_ON(vmap_initialized);
|
| 2333 |
|
| 2334 | for (p = &vmlist; (cur = *p) != NULL; p = &cur->next) {
|
| 2335 | if ((unsigned long)cur->addr - addr >= vm->size)
|
| 2336 | break;
|
| 2337 | addr = ALIGN((unsigned long)cur->addr + cur->size, align);
|
| 2338 | }
|
| 2339 |
|
| 2340 | BUG_ON(addr > VMALLOC_END - vm->size);
|
| 2341 | vm->addr = (void *)addr;
|
| 2342 | vm->next = *p;
|
| 2343 | *p = vm;
|
| 2344 | kasan_populate_early_vm_area_shadow(vm->addr, vm->size);
|
| 2345 | }
|
| 2346 |
|
| 2347 | static void vmap_init_free_space(void)
|
| 2348 | {
|
| 2349 | unsigned long vmap_start = 1;
|
| 2350 | const unsigned long vmap_end = ULONG_MAX;
|
| 2351 | struct vmap_area *busy, *free;
|
| 2352 |
|
| 2353 | |
| 2354 | * B F B B B F
|
| 2355 | * -|-----|.....|-----|-----|-----|.....|-
|
| 2356 | * | The KVA space |
|
| 2357 | * |<--------------------------------->|
|
| 2358 |
|
| 2359 | list_for_each_entry(busy, &vmap_area_list, list) {
|
| 2360 | if (busy->va_start - vmap_start > 0) {
|
| 2361 | free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT);
|
| 2362 | if (!WARN_ON_ONCE(!free)) {
|
| 2363 | free->va_start = vmap_start;
|
| 2364 | free->va_end = busy->va_start;
|
| 2365 |
|
| 2366 | insert_vmap_area_augment(free, NULL,
|
| 2367 | &free_vmap_area_root,
|
| 2368 | &free_vmap_area_list);
|
| 2369 | }
|
| 2370 | }
|
| 2371 |
|
| 2372 | vmap_start = busy->va_end;
|
| 2373 | }
|
| 2374 |
|
| 2375 | if (vmap_end - vmap_start > 0) {
|
| 2376 | free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT);
|
| 2377 | if (!WARN_ON_ONCE(!free)) {
|
| 2378 | free->va_start = vmap_start;
|
| 2379 | free->va_end = vmap_end;
|
| 2380 |
|
| 2381 | insert_vmap_area_augment(free, NULL,
|
| 2382 | &free_vmap_area_root,
|
| 2383 | &free_vmap_area_list);
|
| 2384 | }
|
| 2385 | }
|
| 2386 | }
|
| 2387 |
|
| 2388 | void __init vmalloc_init(void)
|
| 2389 | {
|
| 2390 | struct vmap_area *va;
|
| 2391 | struct vm_struct *tmp;
|
| 2392 | int i;
|
| 2393 |
|
| 2394 | |
| 2395 | * Create the cache for vmap_area objects.
|
| 2396 |
|
| 2397 | vmap_area_cachep = KMEM_CACHE(vmap_area, SLAB_PANIC);
|
| 2398 |
|
| 2399 | for_each_possible_cpu(i) {
|
| 2400 | struct vmap_block_queue *vbq;
|
| 2401 | struct vfree_deferred *p;
|
| 2402 |
|
| 2403 | vbq = &per_cpu(vmap_block_queue, i);
|
| 2404 | spin_lock_init(&vbq->lock);
|
| 2405 | INIT_LIST_HEAD(&vbq->free);
|
| 2406 | p = &per_cpu(vfree_deferred, i);
|
| 2407 | init_llist_head(&p->list);
|
| 2408 | INIT_WORK(&p->wq, free_work);
|
| 2409 | }
|
| 2410 |
|
| 2411 |
|
| 2412 | for (tmp = vmlist; tmp; tmp = tmp->next) {
|
| 2413 | va = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT);
|
| 2414 | if (WARN_ON_ONCE(!va))
|
| 2415 | continue;
|
| 2416 |
|
| 2417 | va->va_start = (unsigned long)tmp->addr;
|
| 2418 | va->va_end = va->va_start + tmp->size;
|
| 2419 | va->vm = tmp;
|
| 2420 | insert_vmap_area(va, &vmap_area_root, &vmap_area_list);
|
| 2421 | }
|
| 2422 |
|
| 2423 | |
| 2424 | * Now we can initialize a free vmap space.
|
| 2425 |
|
| 2426 | vmap_init_free_space();
|
| 2427 | vmap_initialized = true;
|
| 2428 | }
|
| 2429 |
|
| 2430 | static inline void setup_vmalloc_vm_locked(struct vm_struct *vm,
|
| 2431 | struct vmap_area *va, unsigned long flags, const void *caller)
|
| 2432 | {
|
| 2433 | vm->flags = flags;
|
| 2434 | vm->addr = (void *)va->va_start;
|
| 2435 | vm->size = va->va_end - va->va_start;
|
| 2436 | vm->caller = caller;
|
| 2437 | va->vm = vm;
|
| 2438 | }
|
| 2439 |
|
| 2440 | static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
|
| 2441 | unsigned long flags, const void *caller)
|
| 2442 | {
|
| 2443 | spin_lock(&vmap_area_lock);
|
| 2444 | setup_vmalloc_vm_locked(vm, va, flags, caller);
|
| 2445 | spin_unlock(&vmap_area_lock);
|
| 2446 | }
|
| 2447 |
|
| 2448 | static void clear_vm_uninitialized_flag(struct vm_struct *vm)
|
| 2449 | {
|
| 2450 | |
| 2451 | * Before removing VM_UNINITIALIZED,
|
| 2452 | * we should make sure that vm has proper values.
|
| 2453 | * Pair with smp_rmb() in show_numa_info().
|
| 2454 |
|
| 2455 | smp_wmb();
|
| 2456 | vm->flags &= ~VM_UNINITIALIZED;
|
| 2457 | }
|
| 2458 |
|
| 2459 | static struct vm_struct *__get_vm_area_node(unsigned long size,
|
| 2460 | unsigned long align, unsigned long shift, unsigned long flags,
|
| 2461 | unsigned long start, unsigned long end, int node,
|
| 2462 | gfp_t gfp_mask, const void *caller)
|
| 2463 | {
|
| 2464 | struct vmap_area *va;
|
| 2465 | struct vm_struct *area;
|
| 2466 | unsigned long requested_size = size;
|
| 2467 |
|
| 2468 | BUG_ON(in_interrupt());
|
| 2469 | size = ALIGN(size, 1ul << shift);
|
| 2470 | if (unlikely(!size))
|
| 2471 | return NULL;
|
| 2472 |
|
| 2473 | if (flags & VM_IOREMAP)
|
| 2474 | align = 1ul << clamp_t(int, get_count_order_long(size),
|
| 2475 | PAGE_SHIFT, IOREMAP_MAX_ORDER);
|
| 2476 |
|
| 2477 | area = kzalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node);
|
| 2478 | if (unlikely(!area))
|
| 2479 | return NULL;
|
| 2480 |
|
| 2481 | if (!(flags & VM_NO_GUARD))
|
| 2482 | size += PAGE_SIZE;
|
| 2483 |
|
| 2484 | va = alloc_vmap_area(size, align, start, end, node, gfp_mask);
|
| 2485 | if (IS_ERR(va)) {
|
| 2486 | kfree(area);
|
| 2487 | return NULL;
|
| 2488 | }
|
| 2489 |
|
| 2490 | setup_vmalloc_vm(area, va, flags, caller);
|
| 2491 |
|
| 2492 | |
| 2493 | * Mark pages for non-VM_ALLOC mappings as accessible. Do it now as a
|
| 2494 | * best-effort approach, as they can be mapped outside of vmalloc code.
|
| 2495 | * For VM_ALLOC mappings, the pages are marked as accessible after
|
| 2496 | * getting mapped in __vmalloc_node_range().
|
| 2497 | * With hardware tag-based KASAN, marking is skipped for
|
| 2498 | * non-VM_ALLOC mappings, see __kasan_unpoison_vmalloc().
|
| 2499 |
|
| 2500 | if (!(flags & VM_ALLOC))
|
| 2501 | area->addr = kasan_unpoison_vmalloc(area->addr, requested_size,
|
| 2502 | KASAN_VMALLOC_PROT_NORMAL);
|
| 2503 |
|
| 2504 | return area;
|
| 2505 | }
|
| 2506 |
|
| 2507 | struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long flags,
|
| 2508 | unsigned long start, unsigned long end,
|
| 2509 | const void *caller)
|
| 2510 | {
|
| 2511 | return __get_vm_area_node(size, 1, PAGE_SHIFT, flags, start, end,
|
| 2512 | NUMA_NO_NODE, GFP_KERNEL, caller);
|
| 2513 | }
|
| 2514 |
|
| 2515 | |
| 2516 | * get_vm_area - reserve a contiguous kernel virtual area
|
| 2517 | * @size: size of the area
|
| 2518 | * @flags: %VM_IOREMAP for I/O mappings or VM_ALLOC
|
| 2519 | *
|
| 2520 | * Search an area of @size in the kernel virtual mapping area,
|
| 2521 | * and reserved it for out purposes. Returns the area descriptor
|
| 2522 | * on success or %NULL on failure.
|
| 2523 | *
|
| 2524 | * Return: the area descriptor on success or %NULL on failure.
|
| 2525 |
|
| 2526 | struct vm_struct *get_vm_area(unsigned long size, unsigned long flags)
|
| 2527 | {
|
| 2528 | return __get_vm_area_node(size, 1, PAGE_SHIFT, flags,
|
| 2529 | VMALLOC_START, VMALLOC_END,
|
| 2530 | NUMA_NO_NODE, GFP_KERNEL,
|
| 2531 | __builtin_return_address(0));
|
| 2532 | }
|
| 2533 |
|
| 2534 | struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
|
| 2535 | const void *caller)
|
| 2536 | {
|
| 2537 | return __get_vm_area_node(size, 1, PAGE_SHIFT, flags,
|
| 2538 | VMALLOC_START, VMALLOC_END,
|
| 2539 | NUMA_NO_NODE, GFP_KERNEL, caller);
|
| 2540 | }
|
| 2541 |
|
| 2542 | |
| 2543 | * find_vm_area - find a continuous kernel virtual area
|
| 2544 | * @addr: base address
|
| 2545 | *
|
| 2546 | * Search for the kernel VM area starting at @addr, and return it.
|
| 2547 | * It is up to the caller to do all required locking to keep the returned
|
| 2548 | * pointer valid.
|
| 2549 | *
|
| 2550 | * Return: the area descriptor on success or %NULL on failure.
|
| 2551 |
|
| 2552 | struct vm_struct *find_vm_area(const void *addr)
|
| 2553 | {
|
| 2554 | struct vmap_area *va;
|
| 2555 |
|
| 2556 | va = find_vmap_area((unsigned long)addr);
|
| 2557 | if (!va)
|
| 2558 | return NULL;
|
| 2559 |
|
| 2560 | return va->vm;
|
| 2561 | }
|
| 2562 |
|
| 2563 | |
| 2564 | * remove_vm_area - find and remove a continuous kernel virtual area
|
| 2565 | * @addr: base address
|
| 2566 | *
|
| 2567 | * Search for the kernel VM area starting at @addr, and remove it.
|
| 2568 | * This function returns the found VM area, but using it is NOT safe
|
| 2569 | * on SMP machines, except for its size or flags.
|
| 2570 | *
|
| 2571 | * Return: the area descriptor on success or %NULL on failure.
|
| 2572 |
|
| 2573 | struct vm_struct *remove_vm_area(const void *addr)
|
| 2574 | {
|
| 2575 | struct vmap_area *va;
|
| 2576 |
|
| 2577 | might_sleep();
|
| 2578 |
|
| 2579 | spin_lock(&vmap_area_lock);
|
| 2580 | va = __find_vmap_area((unsigned long)addr, &vmap_area_root);
|
| 2581 | if (va && va->vm) {
|
| 2582 | struct vm_struct *vm = va->vm;
|
| 2583 |
|
| 2584 | va->vm = NULL;
|
| 2585 | spin_unlock(&vmap_area_lock);
|
| 2586 |
|
| 2587 | kasan_free_module_shadow(vm);
|
| 2588 | free_unmap_vmap_area(va);
|
| 2589 |
|
| 2590 | return vm;
|
| 2591 | }
|
| 2592 |
|
| 2593 | spin_unlock(&vmap_area_lock);
|
| 2594 | return NULL;
|
| 2595 | }
|
| 2596 |
|
| 2597 | static inline void set_area_direct_map(const struct vm_struct *area,
|
| 2598 | int (*set_direct_map)(struct page *page))
|
| 2599 | {
|
| 2600 | int i;
|
| 2601 |
|
| 2602 |
|
| 2603 | for (i = 0; i < area->nr_pages; i++)
|
| 2604 | if (page_address(area->pages[i]))
|
| 2605 | set_direct_map(area->pages[i]);
|
| 2606 | }
|
| 2607 |
|
| 2608 |
|
| 2609 | static void vm_remove_mappings(struct vm_struct *area, int deallocate_pages)
|
| 2610 | {
|
| 2611 | unsigned long start = ULONG_MAX, end = 0;
|
| 2612 | unsigned int page_order = vm_area_page_order(area);
|
| 2613 | int flush_reset = area->flags & VM_FLUSH_RESET_PERMS;
|
| 2614 | int flush_dmap = 0;
|
| 2615 | int i;
|
| 2616 |
|
| 2617 | remove_vm_area(area->addr);
|
| 2618 |
|
| 2619 |
|
| 2620 | if (!flush_reset)
|
| 2621 | return;
|
| 2622 |
|
| 2623 | |
| 2624 | * If not deallocating pages, just do the flush of the VM area and
|
| 2625 | * return.
|
| 2626 |
|
| 2627 | if (!deallocate_pages) {
|
| 2628 | vm_unmap_aliases();
|
| 2629 | return;
|
| 2630 | }
|
| 2631 |
|
| 2632 | |
| 2633 | * If execution gets here, flush the vm mapping and reset the direct
|
| 2634 | * map. Find the start and end range of the direct mappings to make sure
|
| 2635 | * the vm_unmap_aliases() flush includes the direct map.
|
| 2636 |
|
| 2637 | for (i = 0; i < area->nr_pages; i += 1U << page_order) {
|
| 2638 | unsigned long addr = (unsigned long)page_address(area->pages[i]);
|
| 2639 | if (addr) {
|
| 2640 | unsigned long page_size;
|
| 2641 |
|
| 2642 | page_size = PAGE_SIZE << page_order;
|
| 2643 | start = min(addr, start);
|
| 2644 | end = max(addr + page_size, end);
|
| 2645 | flush_dmap = 1;
|
| 2646 | }
|
| 2647 | }
|
| 2648 |
|
| 2649 | |
| 2650 | * Set direct map to something invalid so that it won't be cached if
|
| 2651 | * there are any accesses after the TLB flush, then flush the TLB and
|
| 2652 | * reset the direct map permissions to the default.
|
| 2653 |
|
| 2654 | set_area_direct_map(area, set_direct_map_invalid_noflush);
|
| 2655 | _vm_unmap_aliases(start, end, flush_dmap);
|
| 2656 | set_area_direct_map(area, set_direct_map_default_noflush);
|
| 2657 | }
|
| 2658 |
|
| 2659 | static void __vunmap(const void *addr, int deallocate_pages)
|
| 2660 | {
|
| 2661 | struct vm_struct *area;
|
| 2662 |
|
| 2663 | if (!addr)
|
| 2664 | return;
|
| 2665 |
|
| 2666 | if (WARN(!PAGE_ALIGNED(addr), "Trying to vfree() bad address (%p)\n",
|
| 2667 | addr))
|
| 2668 | return;
|
| 2669 |
|
| 2670 | area = find_vm_area(addr);
|
| 2671 | if (unlikely(!area)) {
|
| 2672 | WARN(1, KERN_ERR "Trying to vfree() nonexistent vm area (%p)\n",
|
| 2673 | addr);
|
| 2674 | return;
|
| 2675 | }
|
| 2676 |
|
| 2677 | debug_check_no_locks_freed(area->addr, get_vm_area_size(area));
|
| 2678 | debug_check_no_obj_freed(area->addr, get_vm_area_size(area));
|
| 2679 |
|
| 2680 | kasan_poison_vmalloc(area->addr, get_vm_area_size(area));
|
| 2681 |
|
| 2682 | vm_remove_mappings(area, deallocate_pages);
|
| 2683 |
|
| 2684 | if (deallocate_pages) {
|
| 2685 | int i;
|
| 2686 |
|
| 2687 | for (i = 0; i < area->nr_pages; i++) {
|
| 2688 | struct page *page = area->pages[i];
|
| 2689 |
|
| 2690 | BUG_ON(!page);
|
| 2691 | mod_memcg_page_state(page, MEMCG_VMALLOC, -1);
|
| 2692 | |
| 2693 | * High-order allocs for huge vmallocs are split, so
|
| 2694 | * can be freed as an array of order-0 allocations
|
| 2695 |
|
| 2696 | __free_pages(page, 0);
|
| 2697 | cond_resched();
|
| 2698 | }
|
| 2699 | atomic_long_sub(area->nr_pages, &nr_vmalloc_pages);
|
| 2700 |
|
| 2701 | kvfree(area->pages);
|
| 2702 | }
|
| 2703 |
|
| 2704 | kfree(area);
|
| 2705 | }
|
| 2706 |
|
| 2707 | static inline void __vfree_deferred(const void *addr)
|
| 2708 | {
|
| 2709 | |
| 2710 | * Use raw_cpu_ptr() because this can be called from preemptible
|
| 2711 | * context. Preemption is absolutely fine here, because the llist_add()
|
| 2712 | * implementation is lockless, so it works even if we are adding to
|
| 2713 | * another cpu's list. schedule_work() should be fine with this too.
|
| 2714 |
|
| 2715 | struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);
|
| 2716 |
|
| 2717 | if (llist_add((struct llist_node *)addr, &p->list))
|
| 2718 | schedule_work(&p->wq);
|
| 2719 | }
|
| 2720 |
|
| 2721 | |
| 2722 | * vfree_atomic - release memory allocated by vmalloc()
|
| 2723 | * @addr: memory base address
|
| 2724 | *
|
| 2725 | * This one is just like vfree() but can be called in any atomic context
|
| 2726 | * except NMIs.
|
| 2727 |
|
| 2728 | void vfree_atomic(const void *addr)
|
| 2729 | {
|
| 2730 | BUG_ON(in_nmi());
|
| 2731 |
|
| 2732 | kmemleak_free(addr);
|
| 2733 |
|
| 2734 | if (!addr)
|
| 2735 | return;
|
| 2736 | __vfree_deferred(addr);
|
| 2737 | }
|
| 2738 |
|
| 2739 | static void __vfree(const void *addr)
|
| 2740 | {
|
| 2741 | if (unlikely(in_interrupt()))
|
| 2742 | __vfree_deferred(addr);
|
| 2743 | else
|
| 2744 | __vunmap(addr, 1);
|
| 2745 | }
|
| 2746 |
|
| 2747 | |
| 2748 | * vfree - Release memory allocated by vmalloc()
|
| 2749 | * @addr: Memory base address
|
| 2750 | *
|
| 2751 | * Free the virtually continuous memory area starting at @addr, as obtained
|
| 2752 | * from one of the vmalloc() family of APIs. This will usually also free the
|
| 2753 | * physical memory underlying the virtual allocation, but that memory is
|
| 2754 | * reference counted, so it will not be freed until the last user goes away.
|
| 2755 | *
|
| 2756 | * If @addr is NULL, no operation is performed.
|
| 2757 | *
|
| 2758 | * Context:
|
| 2759 | * May sleep if called *not* from interrupt context.
|
| 2760 | * Must not be called in NMI context (strictly speaking, it could be
|
| 2761 | * if we have CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG, but making the calling
|
| 2762 | * conventions for vfree() arch-dependent would be a really bad idea).
|
| 2763 |
|
| 2764 | void vfree(const void *addr)
|
| 2765 | {
|
| 2766 | BUG_ON(in_nmi());
|
| 2767 |
|
| 2768 | kmemleak_free(addr);
|
| 2769 |
|
| 2770 | might_sleep_if(!in_interrupt());
|
| 2771 |
|
| 2772 | if (!addr)
|
| 2773 | return;
|
| 2774 |
|
| 2775 | __vfree(addr);
|
| 2776 | }
|
| 2777 | EXPORT_SYMBOL(vfree);
|
| 2778 |
|
| 2779 | |
| 2780 | * vunmap - release virtual mapping obtained by vmap()
|
| 2781 | * @addr: memory base address
|
| 2782 | *
|
| 2783 | * Free the virtually contiguous memory area starting at @addr,
|
| 2784 | * which was created from the page array passed to vmap().
|
| 2785 | *
|
| 2786 | * Must not be called in interrupt context.
|
| 2787 |
|
| 2788 | void vunmap(const void *addr)
|
| 2789 | {
|
| 2790 | BUG_ON(in_interrupt());
|
| 2791 | might_sleep();
|
| 2792 | if (addr)
|
| 2793 | __vunmap(addr, 0);
|
| 2794 | }
|
| 2795 | EXPORT_SYMBOL(vunmap);
|
| 2796 |
|
| 2797 | |
| 2798 | * vmap - map an array of pages into virtually contiguous space
|
| 2799 | * @pages: array of page pointers
|
| 2800 | * @count: number of pages to map
|
| 2801 | * @flags: vm_area->flags
|
| 2802 | * @prot: page protection for the mapping
|
| 2803 | *
|
| 2804 | * Maps @count pages from @pages into contiguous kernel virtual space.
|
| 2805 | * If @flags contains %VM_MAP_PUT_PAGES the ownership of the pages array itself
|
| 2806 | * (which must be kmalloc or vmalloc memory) and one reference per pages in it
|
| 2807 | * are transferred from the caller to vmap(), and will be freed / dropped when
|
| 2808 | * vfree() is called on the return value.
|
| 2809 | *
|
| 2810 | * Return: the address of the area or %NULL on failure
|
| 2811 |
|
| 2812 | void *vmap(struct page **pages, unsigned int count,
|
| 2813 | unsigned long flags, pgprot_t prot)
|
| 2814 | {
|
| 2815 | struct vm_struct *area;
|
| 2816 | unsigned long addr;
|
| 2817 | unsigned long size;
|
| 2818 |
|
| 2819 | might_sleep();
|
| 2820 |
|
| 2821 | |
| 2822 | * Your top guard is someone else's bottom guard. Not having a top
|
| 2823 | * guard compromises someone else's mappings too.
|
| 2824 |
|
| 2825 | if (WARN_ON_ONCE(flags & VM_NO_GUARD))
|
| 2826 | flags &= ~VM_NO_GUARD;
|
| 2827 |
|
| 2828 | if (count > totalram_pages())
|
| 2829 | return NULL;
|
| 2830 |
|
| 2831 | size = (unsigned long)count << PAGE_SHIFT;
|
| 2832 | area = get_vm_area_caller(size, flags, __builtin_return_address(0));
|
| 2833 | if (!area)
|
| 2834 | return NULL;
|
| 2835 |
|
| 2836 | addr = (unsigned long)area->addr;
|
| 2837 | if (vmap_pages_range(addr, addr + size, pgprot_nx(prot),
|
| 2838 | pages, PAGE_SHIFT) < 0) {
|
| 2839 | vunmap(area->addr);
|
| 2840 | return NULL;
|
| 2841 | }
|
| 2842 |
|
| 2843 | if (flags & VM_MAP_PUT_PAGES) {
|
| 2844 | area->pages = pages;
|
| 2845 | area->nr_pages = count;
|
| 2846 | }
|
| 2847 | return area->addr;
|
| 2848 | }
|
| 2849 | EXPORT_SYMBOL(vmap);
|
| 2850 |
|
| 2851 | #ifdef CONFIG_VMAP_PFN
|
| 2852 | struct vmap_pfn_data {
|
| 2853 | unsigned long *pfns;
|
| 2854 | pgprot_t prot;
|
| 2855 | unsigned int idx;
|
| 2856 | };
|
| 2857 |
|
| 2858 | static int vmap_pfn_apply(pte_t *pte, unsigned long addr, void *private)
|
| 2859 | {
|
| 2860 | struct vmap_pfn_data *data = private;
|
| 2861 |
|
| 2862 | if (WARN_ON_ONCE(pfn_valid(data->pfns[data->idx])))
|
| 2863 | return -EINVAL;
|
| 2864 | *pte = pte_mkspecial(pfn_pte(data->pfns[data->idx++], data->prot));
|
| 2865 | return 0;
|
| 2866 | }
|
| 2867 |
|
| 2868 | |
| 2869 | * vmap_pfn - map an array of PFNs into virtually contiguous space
|
| 2870 | * @pfns: array of PFNs
|
| 2871 | * @count: number of pages to map
|
| 2872 | * @prot: page protection for the mapping
|
| 2873 | *
|
| 2874 | * Maps @count PFNs from @pfns into contiguous kernel virtual space and returns
|
| 2875 | * the start address of the mapping.
|
| 2876 |
|
| 2877 | void *vmap_pfn(unsigned long *pfns, unsigned int count, pgprot_t prot)
|
| 2878 | {
|
| 2879 | struct vmap_pfn_data data = { .pfns = pfns, .prot = pgprot_nx(prot) };
|
| 2880 | struct vm_struct *area;
|
| 2881 |
|
| 2882 | area = get_vm_area_caller(count * PAGE_SIZE, VM_IOREMAP,
|
| 2883 | __builtin_return_address(0));
|
| 2884 | if (!area)
|
| 2885 | return NULL;
|
| 2886 | if (apply_to_page_range(&init_mm, (unsigned long)area->addr,
|
| 2887 | count * PAGE_SIZE, vmap_pfn_apply, &data)) {
|
| 2888 | free_vm_area(area);
|
| 2889 | return NULL;
|
| 2890 | }
|
| 2891 | return area->addr;
|
| 2892 | }
|
| 2893 | EXPORT_SYMBOL_GPL(vmap_pfn);
|
| 2894 | #endif
|
| 2895 |
|
| 2896 | static inline unsigned int
|
| 2897 | vm_area_alloc_pages(gfp_t gfp, int nid,
|
| 2898 | unsigned int order, unsigned int nr_pages, struct page **pages)
|
| 2899 | {
|
| 2900 | unsigned int nr_allocated = 0;
|
| 2901 | struct page *page;
|
| 2902 | int i;
|
| 2903 |
|
| 2904 | |
| 2905 | * For order-0 pages we make use of bulk allocator, if
|
| 2906 | * the page array is partly or not at all populated due
|
| 2907 | * to fails, fallback to a single page allocator that is
|
| 2908 | * more permissive.
|
| 2909 |
|
| 2910 | if (!order) {
|
| 2911 | gfp_t bulk_gfp = gfp & ~__GFP_NOFAIL;
|
| 2912 |
|
| 2913 | while (nr_allocated < nr_pages) {
|
| 2914 | unsigned int nr, nr_pages_request;
|
| 2915 |
|
| 2916 | |
| 2917 | * A maximum allowed request is hard-coded and is 100
|
| 2918 | * pages per call. That is done in order to prevent a
|
| 2919 | * long preemption off scenario in the bulk-allocator
|
| 2920 | * so the range is [1:100].
|
| 2921 |
|
| 2922 | nr_pages_request = min(100U, nr_pages - nr_allocated);
|
| 2923 |
|
| 2924 | |
| 2925 | * wrongly use nearest node when nid == NUMA_NO_NODE,
|
| 2926 | * otherwise memory may be allocated in only one node,
|
| 2927 | * but mempolicy wants to alloc memory by interleaving.
|
| 2928 |
|
| 2929 | if (IS_ENABLED(CONFIG_NUMA) && nid == NUMA_NO_NODE)
|
| 2930 | nr = alloc_pages_bulk_array_mempolicy(bulk_gfp,
|
| 2931 | nr_pages_request,
|
| 2932 | pages + nr_allocated);
|
| 2933 |
|
| 2934 | else
|
| 2935 | nr = alloc_pages_bulk_array_node(bulk_gfp, nid,
|
| 2936 | nr_pages_request,
|
| 2937 | pages + nr_allocated);
|
| 2938 |
|
| 2939 | nr_allocated += nr;
|
| 2940 | cond_resched();
|
| 2941 |
|
| 2942 | |
| 2943 | * If zero or pages were obtained partly,
|
| 2944 | * fallback to a single page allocator.
|
| 2945 |
|
| 2946 | if (nr != nr_pages_request)
|
| 2947 | break;
|
| 2948 | }
|
| 2949 | }
|
| 2950 |
|
| 2951 |
|
| 2952 |
|
| 2953 | while (nr_allocated < nr_pages) {
|
| 2954 | if (fatal_signal_pending(current))
|
| 2955 | break;
|
| 2956 |
|
| 2957 | if (nid == NUMA_NO_NODE)
|
| 2958 | page = alloc_pages(gfp, order);
|
| 2959 | else
|
| 2960 | page = alloc_pages_node(nid, gfp, order);
|
| 2961 | if (unlikely(!page))
|
| 2962 | break;
|
| 2963 | |
| 2964 | * Higher order allocations must be able to be treated as
|
| 2965 | * indepdenent small pages by callers (as they can with
|
| 2966 | * small-page vmallocs). Some drivers do their own refcounting
|
| 2967 | * on vmalloc_to_page() pages, some use page->mapping,
|
| 2968 | * page->lru, etc.
|
| 2969 |
|
| 2970 | if (order)
|
| 2971 | split_page(page, order);
|
| 2972 |
|
| 2973 | |
| 2974 | * Careful, we allocate and map page-order pages, but
|
| 2975 | * tracking is done per PAGE_SIZE page so as to keep the
|
| 2976 | * vm_struct APIs independent of the physical/mapped size.
|
| 2977 |
|
| 2978 | for (i = 0; i < (1U << order); i++)
|
| 2979 | pages[nr_allocated + i] = page + i;
|
| 2980 |
|
| 2981 | cond_resched();
|
| 2982 | nr_allocated += 1U << order;
|
| 2983 | }
|
| 2984 |
|
| 2985 | return nr_allocated;
|
| 2986 | }
|
| 2987 |
|
| 2988 | static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
|
| 2989 | pgprot_t prot, unsigned int page_shift,
|
| 2990 | int node)
|
| 2991 | {
|
| 2992 | const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
|
| 2993 | bool nofail = gfp_mask & __GFP_NOFAIL;
|
| 2994 | unsigned long addr = (unsigned long)area->addr;
|
| 2995 | unsigned long size = get_vm_area_size(area);
|
| 2996 | unsigned long array_size;
|
| 2997 | unsigned int nr_small_pages = size >> PAGE_SHIFT;
|
| 2998 | unsigned int page_order;
|
| 2999 | unsigned int flags;
|
| 3000 | int ret;
|
| 3001 |
|
| 3002 | array_size = (unsigned long)nr_small_pages * sizeof(struct page *);
|
| 3003 | gfp_mask |= __GFP_NOWARN;
|
| 3004 | if (!(gfp_mask & (GFP_DMA | GFP_DMA32)))
|
| 3005 | gfp_mask |= __GFP_HIGHMEM;
|
| 3006 |
|
| 3007 |
|
| 3008 | if (array_size > PAGE_SIZE) {
|
| 3009 | area->pages = __vmalloc_node(array_size, 1, nested_gfp, node,
|
| 3010 | area->caller);
|
| 3011 | } else {
|
| 3012 | area->pages = kmalloc_node(array_size, nested_gfp, node);
|
| 3013 | }
|
| 3014 |
|
| 3015 | if (!area->pages) {
|
| 3016 | warn_alloc(gfp_mask, NULL,
|
| 3017 | "vmalloc error: size %lu, failed to allocated page array size %lu",
|
| 3018 | nr_small_pages * PAGE_SIZE, array_size);
|
| 3019 | free_vm_area(area);
|
| 3020 | return NULL;
|
| 3021 | }
|
| 3022 |
|
| 3023 | set_vm_area_page_order(area, page_shift - PAGE_SHIFT);
|
| 3024 | page_order = vm_area_page_order(area);
|
| 3025 |
|
| 3026 | area->nr_pages = vm_area_alloc_pages(gfp_mask | __GFP_NOWARN,
|
| 3027 | node, page_order, nr_small_pages, area->pages);
|
| 3028 |
|
| 3029 | atomic_long_add(area->nr_pages, &nr_vmalloc_pages);
|
| 3030 | if (gfp_mask & __GFP_ACCOUNT) {
|
| 3031 | int i;
|
| 3032 |
|
| 3033 | for (i = 0; i < area->nr_pages; i++)
|
| 3034 | mod_memcg_page_state(area->pages[i], MEMCG_VMALLOC, 1);
|
| 3035 | }
|
| 3036 |
|
| 3037 | |
| 3038 | * If not enough pages were obtained to accomplish an
|
| 3039 | * allocation request, free them via __vfree() if any.
|
| 3040 |
|
| 3041 | if (area->nr_pages != nr_small_pages) {
|
| 3042 | warn_alloc(gfp_mask, NULL,
|
| 3043 | "vmalloc error: size %lu, page order %u, failed to allocate pages",
|
| 3044 | area->nr_pages * PAGE_SIZE, page_order);
|
| 3045 | goto fail;
|
| 3046 | }
|
| 3047 |
|
| 3048 | |
| 3049 | * page tables allocations ignore external gfp mask, enforce it
|
| 3050 | * by the scope API
|
| 3051 |
|
| 3052 | if ((gfp_mask & (__GFP_FS | __GFP_IO)) == __GFP_IO)
|
| 3053 | flags = memalloc_nofs_save();
|
| 3054 | else if ((gfp_mask & (__GFP_FS | __GFP_IO)) == 0)
|
| 3055 | flags = memalloc_noio_save();
|
| 3056 |
|
| 3057 | do {
|
| 3058 | ret = vmap_pages_range(addr, addr + size, prot, area->pages,
|
| 3059 | page_shift);
|
| 3060 | if (nofail && (ret < 0))
|
| 3061 | schedule_timeout_uninterruptible(1);
|
| 3062 | } while (nofail && (ret < 0));
|
| 3063 |
|
| 3064 | if ((gfp_mask & (__GFP_FS | __GFP_IO)) == __GFP_IO)
|
| 3065 | memalloc_nofs_restore(flags);
|
| 3066 | else if ((gfp_mask & (__GFP_FS | __GFP_IO)) == 0)
|
| 3067 | memalloc_noio_restore(flags);
|
| 3068 |
|
| 3069 | if (ret < 0) {
|
| 3070 | warn_alloc(gfp_mask, NULL,
|
| 3071 | "vmalloc error: size %lu, failed to map pages",
|
| 3072 | area->nr_pages * PAGE_SIZE);
|
| 3073 | goto fail;
|
| 3074 | }
|
| 3075 |
|
| 3076 | return area->addr;
|
| 3077 |
|
| 3078 | fail:
|
| 3079 | __vfree(area->addr);
|
| 3080 | return NULL;
|
| 3081 | }
|
| 3082 |
|
| 3083 | |
| 3084 | * __vmalloc_node_range - allocate virtually contiguous memory
|
| 3085 | * @size: allocation size
|
| 3086 | * @align: desired alignment
|
| 3087 | * @start: vm area range start
|
| 3088 | * @end: vm area range end
|
| 3089 | * @gfp_mask: flags for the page level allocator
|
| 3090 | * @prot: protection mask for the allocated pages
|
| 3091 | * @vm_flags: additional vm area flags (e.g. %VM_NO_GUARD)
|
| 3092 | * @node: node to use for allocation or NUMA_NO_NODE
|
| 3093 | * @caller: caller's return address
|
| 3094 | *
|
| 3095 | * Allocate enough pages to cover @size from the page level
|
| 3096 | * allocator with @gfp_mask flags. Please note that the full set of gfp
|
| 3097 | * flags are not supported. GFP_KERNEL, GFP_NOFS and GFP_NOIO are all
|
| 3098 | * supported.
|
| 3099 | * Zone modifiers are not supported. From the reclaim modifiers
|
| 3100 | * __GFP_DIRECT_RECLAIM is required (aka GFP_NOWAIT is not supported)
|
| 3101 | * and only __GFP_NOFAIL is supported (i.e. __GFP_NORETRY and
|
| 3102 | * __GFP_RETRY_MAYFAIL are not supported).
|
| 3103 | *
|
| 3104 | * __GFP_NOWARN can be used to suppress failures messages.
|
| 3105 | *
|
| 3106 | * Map them into contiguous kernel virtual space, using a pagetable
|
| 3107 | * protection of @prot.
|
| 3108 | *
|
| 3109 | * Return: the address of the area or %NULL on failure
|
| 3110 |
|
| 3111 | void *__vmalloc_node_range(unsigned long size, unsigned long align,
|
| 3112 | unsigned long start, unsigned long end, gfp_t gfp_mask,
|
| 3113 | pgprot_t prot, unsigned long vm_flags, int node,
|
| 3114 | const void *caller)
|
| 3115 | {
|
| 3116 | struct vm_struct *area;
|
| 3117 | void *ret;
|
| 3118 | kasan_vmalloc_flags_t kasan_flags = KASAN_VMALLOC_NONE;
|
| 3119 | unsigned long real_size = size;
|
| 3120 | unsigned long real_align = align;
|
| 3121 | unsigned int shift = PAGE_SHIFT;
|
| 3122 |
|
| 3123 | if (WARN_ON_ONCE(!size))
|
| 3124 | return NULL;
|
| 3125 |
|
| 3126 | if ((size >> PAGE_SHIFT) > totalram_pages()) {
|
| 3127 | warn_alloc(gfp_mask, NULL,
|
| 3128 | "vmalloc error: size %lu, exceeds total pages",
|
| 3129 | real_size);
|
| 3130 | return NULL;
|
| 3131 | }
|
| 3132 |
|
| 3133 | if (vmap_allow_huge && (vm_flags & VM_ALLOW_HUGE_VMAP)) {
|
| 3134 | unsigned long size_per_node;
|
| 3135 |
|
| 3136 | |
| 3137 | * Try huge pages. Only try for PAGE_KERNEL allocations,
|
| 3138 | * others like modules don't yet expect huge pages in
|
| 3139 | * their allocations due to apply_to_page_range not
|
| 3140 | * supporting them.
|
| 3141 |
|
| 3142 |
|
| 3143 | size_per_node = size;
|
| 3144 | if (node == NUMA_NO_NODE)
|
| 3145 | size_per_node /= num_online_nodes();
|
| 3146 | if (arch_vmap_pmd_supported(prot) && size_per_node >= PMD_SIZE)
|
| 3147 | shift = PMD_SHIFT;
|
| 3148 | else
|
| 3149 | shift = arch_vmap_pte_supported_shift(size_per_node);
|
| 3150 |
|
| 3151 | align = max(real_align, 1UL << shift);
|
| 3152 | size = ALIGN(real_size, 1UL << shift);
|
| 3153 | }
|
| 3154 |
|
| 3155 | again:
|
| 3156 | area = __get_vm_area_node(real_size, align, shift, VM_ALLOC |
|
| 3157 | VM_UNINITIALIZED | vm_flags, start, end, node,
|
| 3158 | gfp_mask, caller);
|
| 3159 | if (!area) {
|
| 3160 | bool nofail = gfp_mask & __GFP_NOFAIL;
|
| 3161 | warn_alloc(gfp_mask, NULL,
|
| 3162 | "vmalloc error: size %lu, vm_struct allocation failed%s",
|
| 3163 | real_size, (nofail) ? ". Retrying." : "");
|
| 3164 | if (nofail) {
|
| 3165 | schedule_timeout_uninterruptible(1);
|
| 3166 | goto again;
|
| 3167 | }
|
| 3168 | goto fail;
|
| 3169 | }
|
| 3170 |
|
| 3171 | |
| 3172 | * Prepare arguments for __vmalloc_area_node() and
|
| 3173 | * kasan_unpoison_vmalloc().
|
| 3174 |
|
| 3175 | if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL)) {
|
| 3176 | if (kasan_hw_tags_enabled()) {
|
| 3177 | |
| 3178 | * Modify protection bits to allow tagging.
|
| 3179 | * This must be done before mapping.
|
| 3180 |
|
| 3181 | prot = arch_vmap_pgprot_tagged(prot);
|
| 3182 |
|
| 3183 | |
| 3184 | * Skip page_alloc poisoning and zeroing for physical
|
| 3185 | * pages backing VM_ALLOC mapping. Memory is instead
|
| 3186 | * poisoned and zeroed by kasan_unpoison_vmalloc().
|
| 3187 |
|
| 3188 | gfp_mask |= __GFP_SKIP_KASAN_UNPOISON | __GFP_SKIP_ZERO;
|
| 3189 | }
|
| 3190 |
|
| 3191 |
|
| 3192 | kasan_flags |= KASAN_VMALLOC_PROT_NORMAL;
|
| 3193 | }
|
| 3194 |
|
| 3195 |
|
| 3196 | ret = __vmalloc_area_node(area, gfp_mask, prot, shift, node);
|
| 3197 | if (!ret)
|
| 3198 | goto fail;
|
| 3199 |
|
| 3200 | |
| 3201 | * Mark the pages as accessible, now that they are mapped.
|
| 3202 | * The condition for setting KASAN_VMALLOC_INIT should complement the
|
| 3203 | * one in post_alloc_hook() with regards to the __GFP_SKIP_ZERO check
|
| 3204 | * to make sure that memory is initialized under the same conditions.
|
| 3205 | * Tag-based KASAN modes only assign tags to normal non-executable
|
| 3206 | * allocations, see __kasan_unpoison_vmalloc().
|
| 3207 |
|
| 3208 | kasan_flags |= KASAN_VMALLOC_VM_ALLOC;
|
| 3209 | if (!want_init_on_free() && want_init_on_alloc(gfp_mask) &&
|
| 3210 | (gfp_mask & __GFP_SKIP_ZERO))
|
| 3211 | kasan_flags |= KASAN_VMALLOC_INIT;
|
| 3212 |
|
| 3213 | area->addr = kasan_unpoison_vmalloc(area->addr, real_size, kasan_flags);
|
| 3214 |
|
| 3215 | |
| 3216 | * In this function, newly allocated vm_struct has VM_UNINITIALIZED
|
| 3217 | * flag. It means that vm_struct is not fully initialized.
|
| 3218 | * Now, it is fully initialized, so remove this flag here.
|
| 3219 |
|
| 3220 | clear_vm_uninitialized_flag(area);
|
| 3221 |
|
| 3222 | size = PAGE_ALIGN(size);
|
| 3223 | if (!(vm_flags & VM_DEFER_KMEMLEAK))
|
| 3224 | kmemleak_vmalloc(area, size, gfp_mask);
|
| 3225 |
|
| 3226 | return area->addr;
|
| 3227 |
|
| 3228 | fail:
|
| 3229 | if (shift > PAGE_SHIFT) {
|
| 3230 | shift = PAGE_SHIFT;
|
| 3231 | align = real_align;
|
| 3232 | size = real_size;
|
| 3233 | goto again;
|
| 3234 | }
|
| 3235 |
|
| 3236 | return NULL;
|
| 3237 | }
|
| 3238 |
|
| 3239 | |
| 3240 | * __vmalloc_node - allocate virtually contiguous memory
|
| 3241 | * @size: allocation size
|
| 3242 | * @align: desired alignment
|
| 3243 | * @gfp_mask: flags for the page level allocator
|
| 3244 | * @node: node to use for allocation or NUMA_NO_NODE
|
| 3245 | * @caller: caller's return address
|
| 3246 | *
|
| 3247 | * Allocate enough pages to cover @size from the page level allocator with
|
| 3248 | * @gfp_mask flags. Map them into contiguous kernel virtual space.
|
| 3249 | *
|
| 3250 | * Reclaim modifiers in @gfp_mask - __GFP_NORETRY, __GFP_RETRY_MAYFAIL
|
| 3251 | * and __GFP_NOFAIL are not supported
|
| 3252 | *
|
| 3253 | * Any use of gfp flags outside of GFP_KERNEL should be consulted
|
| 3254 | * with mm people.
|
| 3255 | *
|
| 3256 | * Return: pointer to the allocated memory or %NULL on error
|
| 3257 |
|
| 3258 | void *__vmalloc_node(unsigned long size, unsigned long align,
|
| 3259 | gfp_t gfp_mask, int node, const void *caller)
|
| 3260 | {
|
| 3261 | return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
|
| 3262 | gfp_mask, PAGE_KERNEL, 0, node, caller);
|
| 3263 | }
|
| 3264 | |
| 3265 | * This is only for performance analysis of vmalloc and stress purpose.
|
| 3266 | * It is required by vmalloc test module, therefore do not use it other
|
| 3267 | * than that.
|
| 3268 |
|
| 3269 | #ifdef CONFIG_TEST_VMALLOC_MODULE
|
| 3270 | EXPORT_SYMBOL_GPL(__vmalloc_node);
|
| 3271 | #endif
|
| 3272 |
|
| 3273 | void *__vmalloc(unsigned long size, gfp_t gfp_mask)
|
| 3274 | {
|
| 3275 | return __vmalloc_node(size, 1, gfp_mask, NUMA_NO_NODE,
|
| 3276 | __builtin_return_address(0));
|
| 3277 | }
|
| 3278 | EXPORT_SYMBOL(__vmalloc);
|
| 3279 |
|
| 3280 | |
| 3281 | * vmalloc - allocate virtually contiguous memory
|
| 3282 | * @size: allocation size
|
| 3283 | *
|
| 3284 | * Allocate enough pages to cover @size from the page level
|
| 3285 | * allocator and map them into contiguous kernel virtual space.
|
| 3286 | *
|
| 3287 | * For tight control over page level allocator and protection flags
|
| 3288 | * use __vmalloc() instead.
|
| 3289 | *
|
| 3290 | * Return: pointer to the allocated memory or %NULL on error
|
| 3291 |
|
| 3292 | void *vmalloc(unsigned long size)
|
| 3293 | {
|
| 3294 | return __vmalloc_node(size, 1, GFP_KERNEL, NUMA_NO_NODE,
|
| 3295 | __builtin_return_address(0));
|
| 3296 | }
|
| 3297 | EXPORT_SYMBOL(vmalloc);
|
| 3298 |
|
| 3299 | |
| 3300 | * vmalloc_huge - allocate virtually contiguous memory, allow huge pages
|
| 3301 | * @size: allocation size
|
| 3302 | * @gfp_mask: flags for the page level allocator
|
| 3303 | *
|
| 3304 | * Allocate enough pages to cover @size from the page level
|
| 3305 | * allocator and map them into contiguous kernel virtual space.
|
| 3306 | * If @size is greater than or equal to PMD_SIZE, allow using
|
| 3307 | * huge pages for the memory
|
| 3308 | *
|
| 3309 | * Return: pointer to the allocated memory or %NULL on error
|
| 3310 |
|
| 3311 | void *vmalloc_huge(unsigned long size, gfp_t gfp_mask)
|
| 3312 | {
|
| 3313 | return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
|
| 3314 | gfp_mask, PAGE_KERNEL, VM_ALLOW_HUGE_VMAP,
|
| 3315 | NUMA_NO_NODE, __builtin_return_address(0));
|
| 3316 | }
|
| 3317 | EXPORT_SYMBOL_GPL(vmalloc_huge);
|
| 3318 |
|
| 3319 | |
| 3320 | * vzalloc - allocate virtually contiguous memory with zero fill
|
| 3321 | * @size: allocation size
|
| 3322 | *
|
| 3323 | * Allocate enough pages to cover @size from the page level
|
| 3324 | * allocator and map them into contiguous kernel virtual space.
|
| 3325 | * The memory allocated is set to zero.
|
| 3326 | *
|
| 3327 | * For tight control over page level allocator and protection flags
|
| 3328 | * use __vmalloc() instead.
|
| 3329 | *
|
| 3330 | * Return: pointer to the allocated memory or %NULL on error
|
| 3331 |
|
| 3332 | void *vzalloc(unsigned long size)
|
| 3333 | {
|
| 3334 | return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_ZERO, NUMA_NO_NODE,
|
| 3335 | __builtin_return_address(0));
|
| 3336 | }
|
| 3337 | EXPORT_SYMBOL(vzalloc);
|
| 3338 |
|
| 3339 | |
| 3340 | * vmalloc_user - allocate zeroed virtually contiguous memory for userspace
|
| 3341 | * @size: allocation size
|
| 3342 | *
|
| 3343 | * The resulting memory area is zeroed so it can be mapped to userspace
|
| 3344 | * without leaking data.
|
| 3345 | *
|
| 3346 | * Return: pointer to the allocated memory or %NULL on error
|
| 3347 |
|
| 3348 | void *vmalloc_user(unsigned long size)
|
| 3349 | {
|
| 3350 | return __vmalloc_node_range(size, SHMLBA, VMALLOC_START, VMALLOC_END,
|
| 3351 | GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL,
|
| 3352 | VM_USERMAP, NUMA_NO_NODE,
|
| 3353 | __builtin_return_address(0));
|
| 3354 | }
|
| 3355 | EXPORT_SYMBOL(vmalloc_user);
|
| 3356 |
|
| 3357 | |
| 3358 | * vmalloc_node - allocate memory on a specific node
|
| 3359 | * @size: allocation size
|
| 3360 | * @node: numa node
|
| 3361 | *
|
| 3362 | * Allocate enough pages to cover @size from the page level
|
| 3363 | * allocator and map them into contiguous kernel virtual space.
|
| 3364 | *
|
| 3365 | * For tight control over page level allocator and protection flags
|
| 3366 | * use __vmalloc() instead.
|
| 3367 | *
|
| 3368 | * Return: pointer to the allocated memory or %NULL on error
|
| 3369 |
|
| 3370 | void *vmalloc_node(unsigned long size, int node)
|
| 3371 | {
|
| 3372 | return __vmalloc_node(size, 1, GFP_KERNEL, node,
|
| 3373 | __builtin_return_address(0));
|
| 3374 | }
|
| 3375 | EXPORT_SYMBOL(vmalloc_node);
|
| 3376 |
|
| 3377 | |
| 3378 | * vzalloc_node - allocate memory on a specific node with zero fill
|
| 3379 | * @size: allocation size
|
| 3380 | * @node: numa node
|
| 3381 | *
|
| 3382 | * Allocate enough pages to cover @size from the page level
|
| 3383 | * allocator and map them into contiguous kernel virtual space.
|
| 3384 | * The memory allocated is set to zero.
|
| 3385 | *
|
| 3386 | * Return: pointer to the allocated memory or %NULL on error
|
| 3387 |
|
| 3388 | void *vzalloc_node(unsigned long size, int node)
|
| 3389 | {
|
| 3390 | return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_ZERO, node,
|
| 3391 | __builtin_return_address(0));
|
| 3392 | }
|
| 3393 | EXPORT_SYMBOL(vzalloc_node);
|
| 3394 |
|
| 3395 | #if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)
|
| 3396 | #define GFP_VMALLOC32 (GFP_DMA32 | GFP_KERNEL)
|
| 3397 | #elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA)
|
| 3398 | #define GFP_VMALLOC32 (GFP_DMA | GFP_KERNEL)
|
| 3399 | #else
|
| 3400 | |
| 3401 | * 64b systems should always have either DMA or DMA32 zones. For others
|
| 3402 | * GFP_DMA32 should do the right thing and use the normal zone.
|
| 3403 |
|
| 3404 | #define GFP_VMALLOC32 (GFP_DMA32 | GFP_KERNEL)
|
| 3405 | #endif
|
| 3406 |
|
| 3407 | |
| 3408 | * vmalloc_32 - allocate virtually contiguous memory (32bit addressable)
|
| 3409 | * @size: allocation size
|
| 3410 | *
|
| 3411 | * Allocate enough 32bit PA addressable pages to cover @size from the
|
| 3412 | * page level allocator and map them into contiguous kernel virtual space.
|
| 3413 | *
|
| 3414 | * Return: pointer to the allocated memory or %NULL on error
|
| 3415 |
|
| 3416 | void *vmalloc_32(unsigned long size)
|
| 3417 | {
|
| 3418 | return __vmalloc_node(size, 1, GFP_VMALLOC32, NUMA_NO_NODE,
|
| 3419 | __builtin_return_address(0));
|
| 3420 | }
|
| 3421 | EXPORT_SYMBOL(vmalloc_32);
|
| 3422 |
|
| 3423 | |
| 3424 | * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory
|
| 3425 | * @size: allocation size
|
| 3426 | *
|
| 3427 | * The resulting memory area is 32bit addressable and zeroed so it can be
|
| 3428 | * mapped to userspace without leaking data.
|
| 3429 | *
|
| 3430 | * Return: pointer to the allocated memory or %NULL on error
|
| 3431 |
|
| 3432 | void *vmalloc_32_user(unsigned long size)
|
| 3433 | {
|
| 3434 | return __vmalloc_node_range(size, SHMLBA, VMALLOC_START, VMALLOC_END,
|
| 3435 | GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL,
|
| 3436 | VM_USERMAP, NUMA_NO_NODE,
|
| 3437 | __builtin_return_address(0));
|
| 3438 | }
|
| 3439 | EXPORT_SYMBOL(vmalloc_32_user);
|
| 3440 |
|
| 3441 | |
| 3442 | * small helper routine , copy contents to buf from addr.
|
| 3443 | * If the page is not present, fill zero.
|
| 3444 |
|
| 3445 |
|
| 3446 | static int aligned_vread(char *buf, char *addr, unsigned long count)
|
| 3447 | {
|
| 3448 | struct page *p;
|
| 3449 | int copied = 0;
|
| 3450 |
|
| 3451 | while (count) {
|
| 3452 | unsigned long offset, length;
|
| 3453 |
|
| 3454 | offset = offset_in_page(addr);
|
| 3455 | length = PAGE_SIZE - offset;
|
| 3456 | if (length > count)
|
| 3457 | length = count;
|
| 3458 | p = vmalloc_to_page(addr);
|
| 3459 | |
| 3460 | * To do safe access to this _mapped_ area, we need
|
| 3461 | * lock. But adding lock here means that we need to add
|
| 3462 | * overhead of vmalloc()/vfree() calls for this _debug_
|
| 3463 | * interface, rarely used. Instead of that, we'll use
|
| 3464 | * kmap() and get small overhead in this access function.
|
| 3465 |
|
| 3466 | if (p) {
|
| 3467 |
|
| 3468 | void *map = kmap_atomic(p);
|
| 3469 | memcpy(buf, map + offset, length);
|
| 3470 | kunmap_atomic(map);
|
| 3471 | } else
|
| 3472 | memset(buf, 0, length);
|
| 3473 |
|
| 3474 | addr += length;
|
| 3475 | buf += length;
|
| 3476 | copied += length;
|
| 3477 | count -= length;
|
| 3478 | }
|
| 3479 | return copied;
|
| 3480 | }
|
| 3481 |
|
| 3482 | |
| 3483 | * vread() - read vmalloc area in a safe way.
|
| 3484 | * @buf: buffer for reading data
|
| 3485 | * @addr: vm address.
|
| 3486 | * @count: number of bytes to be read.
|
| 3487 | *
|
| 3488 | * This function checks that addr is a valid vmalloc'ed area, and
|
| 3489 | * copy data from that area to a given buffer. If the given memory range
|
| 3490 | * of [addr...addr+count) includes some valid address, data is copied to
|
| 3491 | * proper area of @buf. If there are memory holes, they'll be zero-filled.
|
| 3492 | * IOREMAP area is treated as memory hole and no copy is done.
|
| 3493 | *
|
| 3494 | * If [addr...addr+count) doesn't includes any intersects with alive
|
| 3495 | * vm_struct area, returns 0. @buf should be kernel's buffer.
|
| 3496 | *
|
| 3497 | * Note: In usual ops, vread() is never necessary because the caller
|
| 3498 | * should know vmalloc() area is valid and can use memcpy().
|
| 3499 | * This is for routines which have to access vmalloc area without
|
| 3500 | * any information, as /proc/kcore.
|
| 3501 | *
|
| 3502 | * Return: number of bytes for which addr and buf should be increased
|
| 3503 | * (same number as @count) or %0 if [addr...addr+count) doesn't
|
| 3504 | * include any intersection with valid vmalloc area
|
| 3505 |
|
| 3506 | long vread(char *buf, char *addr, unsigned long count)
|
| 3507 | {
|
| 3508 | struct vmap_area *va;
|
| 3509 | struct vm_struct *vm;
|
| 3510 | char *vaddr, *buf_start = buf;
|
| 3511 | unsigned long buflen = count;
|
| 3512 | unsigned long n;
|
| 3513 |
|
| 3514 | addr = kasan_reset_tag(addr);
|
| 3515 |
|
| 3516 |
|
| 3517 | if ((unsigned long) addr + count < count)
|
| 3518 | count = -(unsigned long) addr;
|
| 3519 |
|
| 3520 | spin_lock(&vmap_area_lock);
|
| 3521 | va = find_vmap_area_exceed_addr((unsigned long)addr);
|
| 3522 | if (!va)
|
| 3523 | goto finished;
|
| 3524 |
|
| 3525 |
|
| 3526 | if ((unsigned long)addr + count <= va->va_start)
|
| 3527 | goto finished;
|
| 3528 |
|
| 3529 | list_for_each_entry_from(va, &vmap_area_list, list) {
|
| 3530 | if (!count)
|
| 3531 | break;
|
| 3532 |
|
| 3533 | if (!va->vm)
|
| 3534 | continue;
|
| 3535 |
|
| 3536 | vm = va->vm;
|
| 3537 | vaddr = (char *) vm->addr;
|
| 3538 | if (addr >= vaddr + get_vm_area_size(vm))
|
| 3539 | continue;
|
| 3540 | while (addr < vaddr) {
|
| 3541 | if (count == 0)
|
| 3542 | goto finished;
|
| 3543 | *buf = '\0';
|
| 3544 | buf++;
|
| 3545 | addr++;
|
| 3546 | count--;
|
| 3547 | }
|
| 3548 | n = vaddr + get_vm_area_size(vm) - addr;
|
| 3549 | if (n > count)
|
| 3550 | n = count;
|
| 3551 | if (!(vm->flags & VM_IOREMAP))
|
| 3552 | aligned_vread(buf, addr, n);
|
| 3553 | else
|
| 3554 | memset(buf, 0, n);
|
| 3555 | buf += n;
|
| 3556 | addr += n;
|
| 3557 | count -= n;
|
| 3558 | }
|
| 3559 | finished:
|
| 3560 | spin_unlock(&vmap_area_lock);
|
| 3561 |
|
| 3562 | if (buf == buf_start)
|
| 3563 | return 0;
|
| 3564 |
|
| 3565 | if (buf != buf_start + buflen)
|
| 3566 | memset(buf, 0, buflen - (buf - buf_start));
|
| 3567 |
|
| 3568 | return buflen;
|
| 3569 | }
|
| 3570 |
|
| 3571 | |
| 3572 | * remap_vmalloc_range_partial - map vmalloc pages to userspace
|
| 3573 | * @vma: vma to cover
|
| 3574 | * @uaddr: target user address to start at
|
| 3575 | * @kaddr: virtual address of vmalloc kernel memory
|
| 3576 | * @pgoff: offset from @kaddr to start at
|
| 3577 | * @size: size of map area
|
| 3578 | *
|
| 3579 | * Returns: 0 for success, -Exxx on failure
|
| 3580 | *
|
| 3581 | * This function checks that @kaddr is a valid vmalloc'ed area,
|
| 3582 | * and that it is big enough to cover the range starting at
|
| 3583 | * @uaddr in @vma. Will return failure if that criteria isn't
|
| 3584 | * met.
|
| 3585 | *
|
| 3586 | * Similar to remap_pfn_range() (see mm/memory.c)
|
| 3587 |
|
| 3588 | int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr,
|
| 3589 | void *kaddr, unsigned long pgoff,
|
| 3590 | unsigned long size)
|
| 3591 | {
|
| 3592 | struct vm_struct *area;
|
| 3593 | unsigned long off;
|
| 3594 | unsigned long end_index;
|
| 3595 |
|
| 3596 | if (check_shl_overflow(pgoff, PAGE_SHIFT, &off))
|
| 3597 | return -EINVAL;
|
| 3598 |
|
| 3599 | size = PAGE_ALIGN(size);
|
| 3600 |
|
| 3601 | if (!PAGE_ALIGNED(uaddr) || !PAGE_ALIGNED(kaddr))
|
| 3602 | return -EINVAL;
|
| 3603 |
|
| 3604 | area = find_vm_area(kaddr);
|
| 3605 | if (!area)
|
| 3606 | return -EINVAL;
|
| 3607 |
|
| 3608 | if (!(area->flags & (VM_USERMAP | VM_DMA_COHERENT)))
|
| 3609 | return -EINVAL;
|
| 3610 |
|
| 3611 | if (check_add_overflow(size, off, &end_index) ||
|
| 3612 | end_index > get_vm_area_size(area))
|
| 3613 | return -EINVAL;
|
| 3614 | kaddr += off;
|
| 3615 |
|
| 3616 | do {
|
| 3617 | struct page *page = vmalloc_to_page(kaddr);
|
| 3618 | int ret;
|
| 3619 |
|
| 3620 | ret = vm_insert_page(vma, uaddr, page);
|
| 3621 | if (ret)
|
| 3622 | return ret;
|
| 3623 |
|
| 3624 | uaddr += PAGE_SIZE;
|
| 3625 | kaddr += PAGE_SIZE;
|
| 3626 | size -= PAGE_SIZE;
|
| 3627 | } while (size > 0);
|
| 3628 |
|
| 3629 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
|
| 3630 |
|
| 3631 | return 0;
|
| 3632 | }
|
| 3633 |
|
| 3634 | |
| 3635 | * remap_vmalloc_range - map vmalloc pages to userspace
|
| 3636 | * @vma: vma to cover (map full range of vma)
|
| 3637 | * @addr: vmalloc memory
|
| 3638 | * @pgoff: number of pages into addr before first page to map
|
| 3639 | *
|
| 3640 | * Returns: 0 for success, -Exxx on failure
|
| 3641 | *
|
| 3642 | * This function checks that addr is a valid vmalloc'ed area, and
|
| 3643 | * that it is big enough to cover the vma. Will return failure if
|
| 3644 | * that criteria isn't met.
|
| 3645 | *
|
| 3646 | * Similar to remap_pfn_range() (see mm/memory.c)
|
| 3647 |
|
| 3648 | int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
|
| 3649 | unsigned long pgoff)
|
| 3650 | {
|
| 3651 | return remap_vmalloc_range_partial(vma, vma->vm_start,
|
| 3652 | addr, pgoff,
|
| 3653 | vma->vm_end - vma->vm_start);
|
| 3654 | }
|
| 3655 | EXPORT_SYMBOL(remap_vmalloc_range);
|
| 3656 |
|
| 3657 | void free_vm_area(struct vm_struct *area)
|
| 3658 | {
|
| 3659 | struct vm_struct *ret;
|
| 3660 | ret = remove_vm_area(area->addr);
|
| 3661 | BUG_ON(ret != area);
|
| 3662 | kfree(area);
|
| 3663 | }
|
| 3664 | EXPORT_SYMBOL_GPL(free_vm_area);
|
| 3665 |
|
| 3666 | #ifdef CONFIG_SMP
|
| 3667 | static struct vmap_area *node_to_va(struct rb_node *n)
|
| 3668 | {
|
| 3669 | return rb_entry_safe(n, struct vmap_area, rb_node);
|
| 3670 | }
|
| 3671 |
|
| 3672 | |
| 3673 | * pvm_find_va_enclose_addr - find the vmap_area @addr belongs to
|
| 3674 | * @addr: target address
|
| 3675 | *
|
| 3676 | * Returns: vmap_area if it is found. If there is no such area
|
| 3677 | * the first highest(reverse order) vmap_area is returned
|
| 3678 | * i.e. va->va_start < addr && va->va_end < addr or NULL
|
| 3679 | * if there are no any areas before @addr.
|
| 3680 |
|
| 3681 | static struct vmap_area *
|
| 3682 | pvm_find_va_enclose_addr(unsigned long addr)
|
| 3683 | {
|
| 3684 | struct vmap_area *va, *tmp;
|
| 3685 | struct rb_node *n;
|
| 3686 |
|
| 3687 | n = free_vmap_area_root.rb_node;
|
| 3688 | va = NULL;
|
| 3689 |
|
| 3690 | while (n) {
|
| 3691 | tmp = rb_entry(n, struct vmap_area, rb_node);
|
| 3692 | if (tmp->va_start <= addr) {
|
| 3693 | va = tmp;
|
| 3694 | if (tmp->va_end >= addr)
|
| 3695 | break;
|
| 3696 |
|
| 3697 | n = n->rb_right;
|
| 3698 | } else {
|
| 3699 | n = n->rb_left;
|
| 3700 | }
|
| 3701 | }
|
| 3702 |
|
| 3703 | return va;
|
| 3704 | }
|
| 3705 |
|
| 3706 | |
| 3707 | * pvm_determine_end_from_reverse - find the highest aligned address
|
| 3708 | * of free block below VMALLOC_END
|
| 3709 | * @va:
|
| 3710 | * in - the VA we start the search(reverse order);
|
| 3711 | * out - the VA with the highest aligned end address.
|
| 3712 | * @align: alignment for required highest address
|
| 3713 | *
|
| 3714 | * Returns: determined end address within vmap_area
|
| 3715 |
|
| 3716 | static unsigned long
|
| 3717 | pvm_determine_end_from_reverse(struct vmap_area **va, unsigned long align)
|
| 3718 | {
|
| 3719 | unsigned long vmalloc_end = VMALLOC_END & ~(align - 1);
|
| 3720 | unsigned long addr;
|
| 3721 |
|
| 3722 | if (likely(*va)) {
|
| 3723 | list_for_each_entry_from_reverse((*va),
|
| 3724 | &free_vmap_area_list, list) {
|
| 3725 | addr = min((*va)->va_end & ~(align - 1), vmalloc_end);
|
| 3726 | if ((*va)->va_start < addr)
|
| 3727 | return addr;
|
| 3728 | }
|
| 3729 | }
|
| 3730 |
|
| 3731 | return 0;
|
| 3732 | }
|
| 3733 |
|
| 3734 | |
| 3735 | * pcpu_get_vm_areas - allocate vmalloc areas for percpu allocator
|
| 3736 | * @offsets: array containing offset of each area
|
| 3737 | * @sizes: array containing size of each area
|
| 3738 | * @nr_vms: the number of areas to allocate
|
| 3739 | * @align: alignment, all entries in @offsets and @sizes must be aligned to this
|
| 3740 | *
|
| 3741 | * Returns: kmalloc'd vm_struct pointer array pointing to allocated
|
| 3742 | * vm_structs on success, %NULL on failure
|
| 3743 | *
|
| 3744 | * Percpu allocator wants to use congruent vm areas so that it can
|
| 3745 | * maintain the offsets among percpu areas. This function allocates
|
| 3746 | * congruent vmalloc areas for it with GFP_KERNEL. These areas tend to
|
| 3747 | * be scattered pretty far, distance between two areas easily going up
|
| 3748 | * to gigabytes. To avoid interacting with regular vmallocs, these
|
| 3749 | * areas are allocated from top.
|
| 3750 | *
|
| 3751 | * Despite its complicated look, this allocator is rather simple. It
|
| 3752 | * does everything top-down and scans free blocks from the end looking
|
| 3753 | * for matching base. While scanning, if any of the areas do not fit the
|
| 3754 | * base address is pulled down to fit the area. Scanning is repeated till
|
| 3755 | * all the areas fit and then all necessary data structures are inserted
|
| 3756 | * and the result is returned.
|
| 3757 |
|
| 3758 | struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
|
| 3759 | const size_t *sizes, int nr_vms,
|
| 3760 | size_t align)
|
| 3761 | {
|
| 3762 | const unsigned long vmalloc_start = ALIGN(VMALLOC_START, align);
|
| 3763 | const unsigned long vmalloc_end = VMALLOC_END & ~(align - 1);
|
| 3764 | struct vmap_area **vas, *va;
|
| 3765 | struct vm_struct **vms;
|
| 3766 | int area, area2, last_area, term_area;
|
| 3767 | unsigned long base, start, size, end, last_end, orig_start, orig_end;
|
| 3768 | bool purged = false;
|
| 3769 |
|
| 3770 |
|
| 3771 | BUG_ON(offset_in_page(align) || !is_power_of_2(align));
|
| 3772 | for (last_area = 0, area = 0; area < nr_vms; area++) {
|
| 3773 | start = offsets[area];
|
| 3774 | end = start + sizes[area];
|
| 3775 |
|
| 3776 |
|
| 3777 | BUG_ON(!IS_ALIGNED(offsets[area], align));
|
| 3778 | BUG_ON(!IS_ALIGNED(sizes[area], align));
|
| 3779 |
|
| 3780 |
|
| 3781 | if (start > offsets[last_area])
|
| 3782 | last_area = area;
|
| 3783 |
|
| 3784 | for (area2 = area + 1; area2 < nr_vms; area2++) {
|
| 3785 | unsigned long start2 = offsets[area2];
|
| 3786 | unsigned long end2 = start2 + sizes[area2];
|
| 3787 |
|
| 3788 | BUG_ON(start2 < end && start < end2);
|
| 3789 | }
|
| 3790 | }
|
| 3791 | last_end = offsets[last_area] + sizes[last_area];
|
| 3792 |
|
| 3793 | if (vmalloc_end - vmalloc_start < last_end) {
|
| 3794 | WARN_ON(true);
|
| 3795 | return NULL;
|
| 3796 | }
|
| 3797 |
|
| 3798 | vms = kcalloc(nr_vms, sizeof(vms[0]), GFP_KERNEL);
|
| 3799 | vas = kcalloc(nr_vms, sizeof(vas[0]), GFP_KERNEL);
|
| 3800 | if (!vas || !vms)
|
| 3801 | goto err_free2;
|
| 3802 |
|
| 3803 | for (area = 0; area < nr_vms; area++) {
|
| 3804 | vas[area] = kmem_cache_zalloc(vmap_area_cachep, GFP_KERNEL);
|
| 3805 | vms[area] = kzalloc(sizeof(struct vm_struct), GFP_KERNEL);
|
| 3806 | if (!vas[area] || !vms[area])
|
| 3807 | goto err_free;
|
| 3808 | }
|
| 3809 | retry:
|
| 3810 | spin_lock(&free_vmap_area_lock);
|
| 3811 |
|
| 3812 |
|
| 3813 | area = term_area = last_area;
|
| 3814 | start = offsets[area];
|
| 3815 | end = start + sizes[area];
|
| 3816 |
|
| 3817 | va = pvm_find_va_enclose_addr(vmalloc_end);
|
| 3818 | base = pvm_determine_end_from_reverse(&va, align) - end;
|
| 3819 |
|
| 3820 | while (true) {
|
| 3821 | |
| 3822 | * base might have underflowed, add last_end before
|
| 3823 | * comparing.
|
| 3824 |
|
| 3825 | if (base + last_end < vmalloc_start + last_end)
|
| 3826 | goto overflow;
|
| 3827 |
|
| 3828 | |
| 3829 | * Fitting base has not been found.
|
| 3830 |
|
| 3831 | if (va == NULL)
|
| 3832 | goto overflow;
|
| 3833 |
|
| 3834 | |
| 3835 | * If required width exceeds current VA block, move
|
| 3836 | * base downwards and then recheck.
|
| 3837 |
|
| 3838 | if (base + end > va->va_end) {
|
| 3839 | base = pvm_determine_end_from_reverse(&va, align) - end;
|
| 3840 | term_area = area;
|
| 3841 | continue;
|
| 3842 | }
|
| 3843 |
|
| 3844 | |
| 3845 | * If this VA does not fit, move base downwards and recheck.
|
| 3846 |
|
| 3847 | if (base + start < va->va_start) {
|
| 3848 | va = node_to_va(rb_prev(&va->rb_node));
|
| 3849 | base = pvm_determine_end_from_reverse(&va, align) - end;
|
| 3850 | term_area = area;
|
| 3851 | continue;
|
| 3852 | }
|
| 3853 |
|
| 3854 | |
| 3855 | * This area fits, move on to the previous one. If
|
| 3856 | * the previous one is the terminal one, we're done.
|
| 3857 |
|
| 3858 | area = (area + nr_vms - 1) % nr_vms;
|
| 3859 | if (area == term_area)
|
| 3860 | break;
|
| 3861 |
|
| 3862 | start = offsets[area];
|
| 3863 | end = start + sizes[area];
|
| 3864 | va = pvm_find_va_enclose_addr(base + end);
|
| 3865 | }
|
| 3866 |
|
| 3867 |
|
| 3868 | for (area = 0; area < nr_vms; area++) {
|
| 3869 | int ret;
|
| 3870 |
|
| 3871 | start = base + offsets[area];
|
| 3872 | size = sizes[area];
|
| 3873 |
|
| 3874 | va = pvm_find_va_enclose_addr(start);
|
| 3875 | if (WARN_ON_ONCE(va == NULL))
|
| 3876 |
|
| 3877 | goto recovery;
|
| 3878 |
|
| 3879 | ret = adjust_va_to_fit_type(&free_vmap_area_root,
|
| 3880 | &free_vmap_area_list,
|
| 3881 | va, start, size);
|
| 3882 | if (WARN_ON_ONCE(unlikely(ret)))
|
| 3883 |
|
| 3884 | goto recovery;
|
| 3885 |
|
| 3886 |
|
| 3887 | va = vas[area];
|
| 3888 | va->va_start = start;
|
| 3889 | va->va_end = start + size;
|
| 3890 | }
|
| 3891 |
|
| 3892 | spin_unlock(&free_vmap_area_lock);
|
| 3893 |
|
| 3894 |
|
| 3895 | for (area = 0; area < nr_vms; area++) {
|
| 3896 | if (kasan_populate_vmalloc(vas[area]->va_start, sizes[area]))
|
| 3897 | goto err_free_shadow;
|
| 3898 | }
|
| 3899 |
|
| 3900 |
|
| 3901 | spin_lock(&vmap_area_lock);
|
| 3902 | for (area = 0; area < nr_vms; area++) {
|
| 3903 | insert_vmap_area(vas[area], &vmap_area_root, &vmap_area_list);
|
| 3904 |
|
| 3905 | setup_vmalloc_vm_locked(vms[area], vas[area], VM_ALLOC,
|
| 3906 | pcpu_get_vm_areas);
|
| 3907 | }
|
| 3908 | spin_unlock(&vmap_area_lock);
|
| 3909 |
|
| 3910 | |
| 3911 | * Mark allocated areas as accessible. Do it now as a best-effort
|
| 3912 | * approach, as they can be mapped outside of vmalloc code.
|
| 3913 | * With hardware tag-based KASAN, marking is skipped for
|
| 3914 | * non-VM_ALLOC mappings, see __kasan_unpoison_vmalloc().
|
| 3915 |
|
| 3916 | for (area = 0; area < nr_vms; area++)
|
| 3917 | vms[area]->addr = kasan_unpoison_vmalloc(vms[area]->addr,
|
| 3918 | vms[area]->size, KASAN_VMALLOC_PROT_NORMAL);
|
| 3919 |
|
| 3920 | kfree(vas);
|
| 3921 | return vms;
|
| 3922 |
|
| 3923 | recovery:
|
| 3924 | |
| 3925 | * Remove previously allocated areas. There is no
|
| 3926 | * need in removing these areas from the busy tree,
|
| 3927 | * because they are inserted only on the final step
|
| 3928 | * and when pcpu_get_vm_areas() is success.
|
| 3929 |
|
| 3930 | while (area--) {
|
| 3931 | orig_start = vas[area]->va_start;
|
| 3932 | orig_end = vas[area]->va_end;
|
| 3933 | va = merge_or_add_vmap_area_augment(vas[area], &free_vmap_area_root,
|
| 3934 | &free_vmap_area_list);
|
| 3935 | if (va)
|
| 3936 | kasan_release_vmalloc(orig_start, orig_end,
|
| 3937 | va->va_start, va->va_end);
|
| 3938 | vas[area] = NULL;
|
| 3939 | }
|
| 3940 |
|
| 3941 | overflow:
|
| 3942 | spin_unlock(&free_vmap_area_lock);
|
| 3943 | if (!purged) {
|
| 3944 | purge_vmap_area_lazy();
|
| 3945 | purged = true;
|
| 3946 |
|
| 3947 |
|
| 3948 | for (area = 0; area < nr_vms; area++) {
|
| 3949 | if (vas[area])
|
| 3950 | continue;
|
| 3951 |
|
| 3952 | vas[area] = kmem_cache_zalloc(
|
| 3953 | vmap_area_cachep, GFP_KERNEL);
|
| 3954 | if (!vas[area])
|
| 3955 | goto err_free;
|
| 3956 | }
|
| 3957 |
|
| 3958 | goto retry;
|
| 3959 | }
|
| 3960 |
|
| 3961 | err_free:
|
| 3962 | for (area = 0; area < nr_vms; area++) {
|
| 3963 | if (vas[area])
|
| 3964 | kmem_cache_free(vmap_area_cachep, vas[area]);
|
| 3965 |
|
| 3966 | kfree(vms[area]);
|
| 3967 | }
|
| 3968 | err_free2:
|
| 3969 | kfree(vas);
|
| 3970 | kfree(vms);
|
| 3971 | return NULL;
|
| 3972 |
|
| 3973 | err_free_shadow:
|
| 3974 | spin_lock(&free_vmap_area_lock);
|
| 3975 | |
| 3976 | * We release all the vmalloc shadows, even the ones for regions that
|
| 3977 | * hadn't been successfully added. This relies on kasan_release_vmalloc
|
| 3978 | * being able to tolerate this case.
|
| 3979 |
|
| 3980 | for (area = 0; area < nr_vms; area++) {
|
| 3981 | orig_start = vas[area]->va_start;
|
| 3982 | orig_end = vas[area]->va_end;
|
| 3983 | va = merge_or_add_vmap_area_augment(vas[area], &free_vmap_area_root,
|
| 3984 | &free_vmap_area_list);
|
| 3985 | if (va)
|
| 3986 | kasan_release_vmalloc(orig_start, orig_end,
|
| 3987 | va->va_start, va->va_end);
|
| 3988 | vas[area] = NULL;
|
| 3989 | kfree(vms[area]);
|
| 3990 | }
|
| 3991 | spin_unlock(&free_vmap_area_lock);
|
| 3992 | kfree(vas);
|
| 3993 | kfree(vms);
|
| 3994 | return NULL;
|
| 3995 | }
|
| 3996 |
|
| 3997 | |
| 3998 | * pcpu_free_vm_areas - free vmalloc areas for percpu allocator
|
| 3999 | * @vms: vm_struct pointer array returned by pcpu_get_vm_areas()
|
| 4000 | * @nr_vms: the number of allocated areas
|
| 4001 | *
|
| 4002 | * Free vm_structs and the array allocated by pcpu_get_vm_areas().
|
| 4003 |
|
| 4004 | void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
|
| 4005 | {
|
| 4006 | int i;
|
| 4007 |
|
| 4008 | for (i = 0; i < nr_vms; i++)
|
| 4009 | free_vm_area(vms[i]);
|
| 4010 | kfree(vms);
|
| 4011 | }
|
| 4012 | #endif
|
| 4013 |
|
| 4014 | #ifdef CONFIG_PRINTK
|
| 4015 | bool vmalloc_dump_obj(void *object)
|
| 4016 | {
|
| 4017 | struct vm_struct *vm;
|
| 4018 | void *objp = (void *)PAGE_ALIGN((unsigned long)object);
|
| 4019 |
|
| 4020 | vm = find_vm_area(objp);
|
| 4021 | if (!vm)
|
| 4022 | return false;
|
| 4023 | pr_cont(" %u-page vmalloc region starting at %#lx allocated at %pS\n",
|
| 4024 | vm->nr_pages, (unsigned long)vm->addr, vm->caller);
|
| 4025 | return true;
|
| 4026 | }
|
| 4027 | #endif
|
| 4028 |
|
| 4029 | #ifdef CONFIG_PROC_FS
|
| 4030 | static void *s_start(struct seq_file *m, loff_t *pos)
|
| 4031 | __acquires(&vmap_purge_lock)
|
| 4032 | __acquires(&vmap_area_lock)
|
| 4033 | {
|
| 4034 | mutex_lock(&vmap_purge_lock);
|
| 4035 | spin_lock(&vmap_area_lock);
|
| 4036 |
|
| 4037 | return seq_list_start(&vmap_area_list, *pos);
|
| 4038 | }
|
| 4039 |
|
| 4040 | static void *s_next(struct seq_file *m, void *p, loff_t *pos)
|
| 4041 | {
|
| 4042 | return seq_list_next(p, &vmap_area_list, pos);
|
| 4043 | }
|
| 4044 |
|
| 4045 | static void s_stop(struct seq_file *m, void *p)
|
| 4046 | __releases(&vmap_area_lock)
|
| 4047 | __releases(&vmap_purge_lock)
|
| 4048 | {
|
| 4049 | spin_unlock(&vmap_area_lock);
|
| 4050 | mutex_unlock(&vmap_purge_lock);
|
| 4051 | }
|
| 4052 |
|
| 4053 | static void show_numa_info(struct seq_file *m, struct vm_struct *v)
|
| 4054 | {
|
| 4055 | if (IS_ENABLED(CONFIG_NUMA)) {
|
| 4056 | unsigned int nr, *counters = m->private;
|
| 4057 | unsigned int step = 1U << vm_area_page_order(v);
|
| 4058 |
|
| 4059 | if (!counters)
|
| 4060 | return;
|
| 4061 |
|
| 4062 | if (v->flags & VM_UNINITIALIZED)
|
| 4063 | return;
|
| 4064 |
|
| 4065 | smp_rmb();
|
| 4066 |
|
| 4067 | memset(counters, 0, nr_node_ids * sizeof(unsigned int));
|
| 4068 |
|
| 4069 | for (nr = 0; nr < v->nr_pages; nr += step)
|
| 4070 | counters[page_to_nid(v->pages[nr])] += step;
|
| 4071 | for_each_node_state(nr, N_HIGH_MEMORY)
|
| 4072 | if (counters[nr])
|
| 4073 | seq_printf(m, " N%u=%u", nr, counters[nr]);
|
| 4074 | }
|
| 4075 | }
|
| 4076 |
|
| 4077 | static void show_purge_info(struct seq_file *m)
|
| 4078 | {
|
| 4079 | struct vmap_area *va;
|
| 4080 |
|
| 4081 | spin_lock(&purge_vmap_area_lock);
|
| 4082 | list_for_each_entry(va, &purge_vmap_area_list, list) {
|
| 4083 | seq_printf(m, "0x%pK-0x%pK %7ld unpurged vm_area\n",
|
| 4084 | (void *)va->va_start, (void *)va->va_end,
|
| 4085 | va->va_end - va->va_start);
|
| 4086 | }
|
| 4087 | spin_unlock(&purge_vmap_area_lock);
|
| 4088 | }
|
| 4089 |
|
| 4090 | static int s_show(struct seq_file *m, void *p)
|
| 4091 | {
|
| 4092 | struct vmap_area *va;
|
| 4093 | struct vm_struct *v;
|
| 4094 |
|
| 4095 | va = list_entry(p, struct vmap_area, list);
|
| 4096 |
|
| 4097 | |
| 4098 | * s_show can encounter race with remove_vm_area, !vm on behalf
|
| 4099 | * of vmap area is being tear down or vm_map_ram allocation.
|
| 4100 |
|
| 4101 | if (!va->vm) {
|
| 4102 | seq_printf(m, "0x%pK-0x%pK %7ld vm_map_ram\n",
|
| 4103 | (void *)va->va_start, (void *)va->va_end,
|
| 4104 | va->va_end - va->va_start);
|
| 4105 |
|
| 4106 | goto final;
|
| 4107 | }
|
| 4108 |
|
| 4109 | v = va->vm;
|
| 4110 |
|
| 4111 | seq_printf(m, "0x%pK-0x%pK %7ld",
|
| 4112 | v->addr, v->addr + v->size, v->size);
|
| 4113 |
|
| 4114 | if (v->caller)
|
| 4115 | seq_printf(m, " %pS", v->caller);
|
| 4116 |
|
| 4117 | if (v->nr_pages)
|
| 4118 | seq_printf(m, " pages=%d", v->nr_pages);
|
| 4119 |
|
| 4120 | if (v->phys_addr)
|
| 4121 | seq_printf(m, " phys=%pa", &v->phys_addr);
|
| 4122 |
|
| 4123 | if (v->flags & VM_IOREMAP)
|
| 4124 | seq_puts(m, " ioremap");
|
| 4125 |
|
| 4126 | if (v->flags & VM_ALLOC)
|
| 4127 | seq_puts(m, " vmalloc");
|
| 4128 |
|
| 4129 | if (v->flags & VM_MAP)
|
| 4130 | seq_puts(m, " vmap");
|
| 4131 |
|
| 4132 | if (v->flags & VM_USERMAP)
|
| 4133 | seq_puts(m, " user");
|
| 4134 |
|
| 4135 | if (v->flags & VM_DMA_COHERENT)
|
| 4136 | seq_puts(m, " dma-coherent");
|
| 4137 |
|
| 4138 | if (is_vmalloc_addr(v->pages))
|
| 4139 | seq_puts(m, " vpages");
|
| 4140 |
|
| 4141 | show_numa_info(m, v);
|
| 4142 | seq_putc(m, '\n');
|
| 4143 |
|
| 4144 | |
| 4145 | * As a final step, dump "unpurged" areas.
|
| 4146 |
|
| 4147 | final:
|
| 4148 | if (list_is_last(&va->list, &vmap_area_list))
|
| 4149 | show_purge_info(m);
|
| 4150 |
|
| 4151 | return 0;
|
| 4152 | }
|
| 4153 |
|
| 4154 | static const struct seq_operations vmalloc_op = {
|
| 4155 | .start = s_start,
|
| 4156 | .next = s_next,
|
| 4157 | .stop = s_stop,
|
| 4158 | .show = s_show,
|
| 4159 | };
|
| 4160 |
|
| 4161 | static int __init proc_vmalloc_init(void)
|
| 4162 | {
|
| 4163 | if (IS_ENABLED(CONFIG_NUMA))
|
| 4164 | proc_create_seq_private("vmallocinfo", 0400, NULL,
|
| 4165 | &vmalloc_op,
|
| 4166 | nr_node_ids * sizeof(unsigned int), NULL);
|
| 4167 | else
|
| 4168 | proc_create_seq("vmallocinfo", 0400, NULL, &vmalloc_op);
|
| 4169 | return 0;
|
| 4170 | }
|
| 4171 | module_init(proc_vmalloc_init);
|
| 4172 |
|
| 4173 | #endif
|