4 * Copyright (C) 1993 Linus Torvalds
5 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
6 * SMP-safe vmalloc/vfree/ioremap, Tigran Aivazian <tigran@veritas.com>, May 2000
7 * Major rework to support vmap/vunmap, Christoph Hellwig, SGI, August 2002
8 * Numa awareness, Christoph Lameter, SGI, June 2005
11 #include <linux/vmalloc.h>
13 #include <linux/module.h>
14 #include <linux/highmem.h>
15 #include <linux/sched/signal.h>
16 #include <linux/slab.h>
17 #include <linux/spinlock.h>
18 #include <linux/interrupt.h>
19 #include <linux/proc_fs.h>
20 #include <linux/seq_file.h>
21 #include <linux/debugobjects.h>
22 #include <linux/kallsyms.h>
23 #include <linux/list.h>
24 #include <linux/notifier.h>
25 #include <linux/rbtree.h>
26 #include <linux/radix-tree.h>
27 #include <linux/rcupdate.h>
28 #include <linux/pfn.h>
29 #include <linux/kmemleak.h>
30 #include <linux/atomic.h>
31 #include <linux/compiler.h>
32 #include <linux/llist.h>
33 #include <linux/bitops.h>
35 #include <linux/uaccess.h>
36 #include <asm/tlbflush.h>
37 #include <asm/shmparam.h>
41 struct vfree_deferred {
42 struct llist_head list;
43 struct work_struct wq;
45 static DEFINE_PER_CPU(struct vfree_deferred, vfree_deferred);
47 static void __vunmap(const void *, int);
49 static void free_work(struct work_struct *w)
51 struct vfree_deferred *p = container_of(w, struct vfree_deferred, wq);
52 struct llist_node *t, *llnode;
54 llist_for_each_safe(llnode, t, llist_del_all(&p->list))
55 __vunmap((void *)llnode, 1);
58 /*** Page table manipulation functions ***/
60 static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end)
64 pte = pte_offset_kernel(pmd, addr);
66 pte_t ptent = ptep_get_and_clear(&init_mm, addr, pte);
67 WARN_ON(!pte_none(ptent) && !pte_present(ptent));
68 } while (pte++, addr += PAGE_SIZE, addr != end);
71 static void vunmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end)
76 pmd = pmd_offset(pud, addr);
78 next = pmd_addr_end(addr, end);
79 if (pmd_clear_huge(pmd))
81 if (pmd_none_or_clear_bad(pmd))
83 vunmap_pte_range(pmd, addr, next);
84 } while (pmd++, addr = next, addr != end);
87 static void vunmap_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end)
92 pud = pud_offset(p4d, addr);
94 next = pud_addr_end(addr, end);
95 if (pud_clear_huge(pud))
97 if (pud_none_or_clear_bad(pud))
99 vunmap_pmd_range(pud, addr, next);
100 } while (pud++, addr = next, addr != end);
103 static void vunmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end)
108 p4d = p4d_offset(pgd, addr);
110 next = p4d_addr_end(addr, end);
111 if (p4d_clear_huge(p4d))
113 if (p4d_none_or_clear_bad(p4d))
115 vunmap_pud_range(p4d, addr, next);
116 } while (p4d++, addr = next, addr != end);
119 static void vunmap_page_range(unsigned long addr, unsigned long end)
125 pgd = pgd_offset_k(addr);
127 next = pgd_addr_end(addr, end);
128 if (pgd_none_or_clear_bad(pgd))
130 vunmap_p4d_range(pgd, addr, next);
131 } while (pgd++, addr = next, addr != end);
134 static int vmap_pte_range(pmd_t *pmd, unsigned long addr,
135 unsigned long end, pgprot_t prot, struct page **pages, int *nr)
140 * nr is a running index into the array which helps higher level
141 * callers keep track of where we're up to.
144 pte = pte_alloc_kernel(pmd, addr);
148 struct page *page = pages[*nr];
150 if (WARN_ON(!pte_none(*pte)))
154 set_pte_at(&init_mm, addr, pte, mk_pte(page, prot));
156 } while (pte++, addr += PAGE_SIZE, addr != end);
160 static int vmap_pmd_range(pud_t *pud, unsigned long addr,
161 unsigned long end, pgprot_t prot, struct page **pages, int *nr)
166 pmd = pmd_alloc(&init_mm, pud, addr);
170 next = pmd_addr_end(addr, end);
171 if (vmap_pte_range(pmd, addr, next, prot, pages, nr))
173 } while (pmd++, addr = next, addr != end);
177 static int vmap_pud_range(p4d_t *p4d, unsigned long addr,
178 unsigned long end, pgprot_t prot, struct page **pages, int *nr)
183 pud = pud_alloc(&init_mm, p4d, addr);
187 next = pud_addr_end(addr, end);
188 if (vmap_pmd_range(pud, addr, next, prot, pages, nr))
190 } while (pud++, addr = next, addr != end);
194 static int vmap_p4d_range(pgd_t *pgd, unsigned long addr,
195 unsigned long end, pgprot_t prot, struct page **pages, int *nr)
200 p4d = p4d_alloc(&init_mm, pgd, addr);
204 next = p4d_addr_end(addr, end);
205 if (vmap_pud_range(p4d, addr, next, prot, pages, nr))
207 } while (p4d++, addr = next, addr != end);
212 * Set up page tables in kva (addr, end). The ptes shall have prot "prot", and
213 * will have pfns corresponding to the "pages" array.
215 * Ie. pte at addr+N*PAGE_SIZE shall point to pfn corresponding to pages[N]
217 static int vmap_page_range_noflush(unsigned long start, unsigned long end,
218 pgprot_t prot, struct page **pages)
222 unsigned long addr = start;
227 pgd = pgd_offset_k(addr);
229 next = pgd_addr_end(addr, end);
230 err = vmap_p4d_range(pgd, addr, next, prot, pages, &nr);
233 } while (pgd++, addr = next, addr != end);
238 static int vmap_page_range(unsigned long start, unsigned long end,
239 pgprot_t prot, struct page **pages)
243 ret = vmap_page_range_noflush(start, end, prot, pages);
244 flush_cache_vmap(start, end);
248 int is_vmalloc_or_module_addr(const void *x)
251 * ARM, x86-64 and sparc64 put modules in a special place,
252 * and fall back on vmalloc() if that fails. Others
253 * just put it in the vmalloc space.
255 #if defined(CONFIG_MODULES) && defined(MODULES_VADDR)
256 unsigned long addr = (unsigned long)x;
257 if (addr >= MODULES_VADDR && addr < MODULES_END)
260 return is_vmalloc_addr(x);
264 * Walk a vmap address to the struct page it maps.
266 struct page *vmalloc_to_page(const void *vmalloc_addr)
268 unsigned long addr = (unsigned long) vmalloc_addr;
269 struct page *page = NULL;
270 pgd_t *pgd = pgd_offset_k(addr);
277 * XXX we might need to change this if we add VIRTUAL_BUG_ON for
278 * architectures that do not vmalloc module space
280 VIRTUAL_BUG_ON(!is_vmalloc_or_module_addr(vmalloc_addr));
284 p4d = p4d_offset(pgd, addr);
287 pud = pud_offset(p4d, addr);
290 * Don't dereference bad PUD or PMD (below) entries. This will also
291 * identify huge mappings, which we may encounter on architectures
292 * that define CONFIG_HAVE_ARCH_HUGE_VMAP=y. Such regions will be
293 * identified as vmalloc addresses by is_vmalloc_addr(), but are
294 * not [unambiguously] associated with a struct page, so there is
295 * no correct value to return for them.
297 WARN_ON_ONCE(pud_bad(*pud));
298 if (pud_none(*pud) || pud_bad(*pud))
300 pmd = pmd_offset(pud, addr);
301 WARN_ON_ONCE(pmd_bad(*pmd));
302 if (pmd_none(*pmd) || pmd_bad(*pmd))
305 ptep = pte_offset_map(pmd, addr);
307 if (pte_present(pte))
308 page = pte_page(pte);
312 EXPORT_SYMBOL(vmalloc_to_page);
315 * Map a vmalloc()-space virtual address to the physical page frame number.
317 unsigned long vmalloc_to_pfn(const void *vmalloc_addr)
319 return page_to_pfn(vmalloc_to_page(vmalloc_addr));
321 EXPORT_SYMBOL(vmalloc_to_pfn);
324 /*** Global kva allocator ***/
326 #define VM_LAZY_FREE 0x02
327 #define VM_VM_AREA 0x04
329 static DEFINE_SPINLOCK(vmap_area_lock);
330 /* Export for kexec only */
331 LIST_HEAD(vmap_area_list);
332 static LLIST_HEAD(vmap_purge_list);
333 static struct rb_root vmap_area_root = RB_ROOT;
335 /* The vmap cache globals are protected by vmap_area_lock */
336 static struct rb_node *free_vmap_cache;
337 static unsigned long cached_hole_size;
338 static unsigned long cached_vstart;
339 static unsigned long cached_align;
341 static unsigned long vmap_area_pcpu_hole;
343 static struct vmap_area *__find_vmap_area(unsigned long addr)
345 struct rb_node *n = vmap_area_root.rb_node;
348 struct vmap_area *va;
350 va = rb_entry(n, struct vmap_area, rb_node);
351 if (addr < va->va_start)
353 else if (addr >= va->va_end)
362 static void __insert_vmap_area(struct vmap_area *va)
364 struct rb_node **p = &vmap_area_root.rb_node;
365 struct rb_node *parent = NULL;
369 struct vmap_area *tmp_va;
372 tmp_va = rb_entry(parent, struct vmap_area, rb_node);
373 if (va->va_start < tmp_va->va_end)
375 else if (va->va_end > tmp_va->va_start)
381 rb_link_node(&va->rb_node, parent, p);
382 rb_insert_color(&va->rb_node, &vmap_area_root);
384 /* address-sort this list */
385 tmp = rb_prev(&va->rb_node);
387 struct vmap_area *prev;
388 prev = rb_entry(tmp, struct vmap_area, rb_node);
389 list_add_rcu(&va->list, &prev->list);
391 list_add_rcu(&va->list, &vmap_area_list);
394 static void purge_vmap_area_lazy(void);
396 static BLOCKING_NOTIFIER_HEAD(vmap_notify_list);
399 * Allocate a region of KVA of the specified size and alignment, within the
402 static struct vmap_area *alloc_vmap_area(unsigned long size,
404 unsigned long vstart, unsigned long vend,
405 int node, gfp_t gfp_mask)
407 struct vmap_area *va;
411 struct vmap_area *first;
414 BUG_ON(offset_in_page(size));
415 BUG_ON(!is_power_of_2(align));
419 va = kmalloc_node(sizeof(struct vmap_area),
420 gfp_mask & GFP_RECLAIM_MASK, node);
422 return ERR_PTR(-ENOMEM);
425 * Only scan the relevant parts containing pointers to other objects
426 * to avoid false negatives.
428 kmemleak_scan_area(&va->rb_node, SIZE_MAX, gfp_mask & GFP_RECLAIM_MASK);
431 spin_lock(&vmap_area_lock);
433 * Invalidate cache if we have more permissive parameters.
434 * cached_hole_size notes the largest hole noticed _below_
435 * the vmap_area cached in free_vmap_cache: if size fits
436 * into that hole, we want to scan from vstart to reuse
437 * the hole instead of allocating above free_vmap_cache.
438 * Note that __free_vmap_area may update free_vmap_cache
439 * without updating cached_hole_size or cached_align.
441 if (!free_vmap_cache ||
442 size < cached_hole_size ||
443 vstart < cached_vstart ||
444 align < cached_align) {
446 cached_hole_size = 0;
447 free_vmap_cache = NULL;
449 /* record if we encounter less permissive parameters */
450 cached_vstart = vstart;
451 cached_align = align;
453 /* find starting point for our search */
454 if (free_vmap_cache) {
455 first = rb_entry(free_vmap_cache, struct vmap_area, rb_node);
456 addr = ALIGN(first->va_end, align);
459 if (addr + size < addr)
463 addr = ALIGN(vstart, align);
464 if (addr + size < addr)
467 n = vmap_area_root.rb_node;
471 struct vmap_area *tmp;
472 tmp = rb_entry(n, struct vmap_area, rb_node);
473 if (tmp->va_end >= addr) {
475 if (tmp->va_start <= addr)
486 /* from the starting point, walk areas until a suitable hole is found */
487 while (addr + size > first->va_start && addr + size <= vend) {
488 if (addr + cached_hole_size < first->va_start)
489 cached_hole_size = first->va_start - addr;
490 addr = ALIGN(first->va_end, align);
491 if (addr + size < addr)
494 if (list_is_last(&first->list, &vmap_area_list))
497 first = list_next_entry(first, list);
501 if (addr + size > vend)
505 va->va_end = addr + size;
507 __insert_vmap_area(va);
508 free_vmap_cache = &va->rb_node;
509 spin_unlock(&vmap_area_lock);
511 BUG_ON(!IS_ALIGNED(va->va_start, align));
512 BUG_ON(va->va_start < vstart);
513 BUG_ON(va->va_end > vend);
518 spin_unlock(&vmap_area_lock);
520 purge_vmap_area_lazy();
525 if (gfpflags_allow_blocking(gfp_mask)) {
526 unsigned long freed = 0;
527 blocking_notifier_call_chain(&vmap_notify_list, 0, &freed);
534 if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit())
535 pr_warn("vmap allocation for size %lu failed: use vmalloc=<size> to increase size\n",
538 return ERR_PTR(-EBUSY);
541 int register_vmap_purge_notifier(struct notifier_block *nb)
543 return blocking_notifier_chain_register(&vmap_notify_list, nb);
545 EXPORT_SYMBOL_GPL(register_vmap_purge_notifier);
547 int unregister_vmap_purge_notifier(struct notifier_block *nb)
549 return blocking_notifier_chain_unregister(&vmap_notify_list, nb);
551 EXPORT_SYMBOL_GPL(unregister_vmap_purge_notifier);
553 static void __free_vmap_area(struct vmap_area *va)
555 BUG_ON(RB_EMPTY_NODE(&va->rb_node));
557 if (free_vmap_cache) {
558 if (va->va_end < cached_vstart) {
559 free_vmap_cache = NULL;
561 struct vmap_area *cache;
562 cache = rb_entry(free_vmap_cache, struct vmap_area, rb_node);
563 if (va->va_start <= cache->va_start) {
564 free_vmap_cache = rb_prev(&va->rb_node);
566 * We don't try to update cached_hole_size or
567 * cached_align, but it won't go very wrong.
572 rb_erase(&va->rb_node, &vmap_area_root);
573 RB_CLEAR_NODE(&va->rb_node);
574 list_del_rcu(&va->list);
577 * Track the highest possible candidate for pcpu area
578 * allocation. Areas outside of vmalloc area can be returned
579 * here too, consider only end addresses which fall inside
580 * vmalloc area proper.
582 if (va->va_end > VMALLOC_START && va->va_end <= VMALLOC_END)
583 vmap_area_pcpu_hole = max(vmap_area_pcpu_hole, va->va_end);
585 kfree_rcu(va, rcu_head);
589 * Free a region of KVA allocated by alloc_vmap_area
591 static void free_vmap_area(struct vmap_area *va)
593 spin_lock(&vmap_area_lock);
594 __free_vmap_area(va);
595 spin_unlock(&vmap_area_lock);
599 * Clear the pagetable entries of a given vmap_area
601 static void unmap_vmap_area(struct vmap_area *va)
603 vunmap_page_range(va->va_start, va->va_end);
607 * lazy_max_pages is the maximum amount of virtual address space we gather up
608 * before attempting to purge with a TLB flush.
610 * There is a tradeoff here: a larger number will cover more kernel page tables
611 * and take slightly longer to purge, but it will linearly reduce the number of
612 * global TLB flushes that must be performed. It would seem natural to scale
613 * this number up linearly with the number of CPUs (because vmapping activity
614 * could also scale linearly with the number of CPUs), however it is likely
615 * that in practice, workloads might be constrained in other ways that mean
616 * vmap activity will not scale linearly with CPUs. Also, I want to be
617 * conservative and not introduce a big latency on huge systems, so go with
618 * a less aggressive log scale. It will still be an improvement over the old
619 * code, and it will be simple to change the scale factor if we find that it
620 * becomes a problem on bigger systems.
622 static unsigned long lazy_max_pages(void)
626 log = fls(num_online_cpus());
628 return log * (32UL * 1024 * 1024 / PAGE_SIZE);
631 static atomic_t vmap_lazy_nr = ATOMIC_INIT(0);
634 * Serialize vmap purging. There is no actual criticial section protected
635 * by this look, but we want to avoid concurrent calls for performance
636 * reasons and to make the pcpu_get_vm_areas more deterministic.
638 static DEFINE_MUTEX(vmap_purge_lock);
640 /* for per-CPU blocks */
641 static void purge_fragmented_blocks_allcpus(void);
644 * called before a call to iounmap() if the caller wants vm_area_struct's
647 void set_iounmap_nonlazy(void)
649 atomic_set(&vmap_lazy_nr, lazy_max_pages()+1);
653 * Purges all lazily-freed vmap areas.
655 static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)
657 struct llist_node *valist;
658 struct vmap_area *va;
659 struct vmap_area *n_va;
660 bool do_free = false;
662 lockdep_assert_held(&vmap_purge_lock);
664 valist = llist_del_all(&vmap_purge_list);
665 llist_for_each_entry(va, valist, purge_list) {
666 if (va->va_start < start)
667 start = va->va_start;
668 if (va->va_end > end)
676 flush_tlb_kernel_range(start, end);
678 spin_lock(&vmap_area_lock);
679 llist_for_each_entry_safe(va, n_va, valist, purge_list) {
680 int nr = (va->va_end - va->va_start) >> PAGE_SHIFT;
682 __free_vmap_area(va);
683 atomic_sub(nr, &vmap_lazy_nr);
684 cond_resched_lock(&vmap_area_lock);
686 spin_unlock(&vmap_area_lock);
691 * Kick off a purge of the outstanding lazy areas. Don't bother if somebody
692 * is already purging.
694 static void try_purge_vmap_area_lazy(void)
696 if (mutex_trylock(&vmap_purge_lock)) {
697 __purge_vmap_area_lazy(ULONG_MAX, 0);
698 mutex_unlock(&vmap_purge_lock);
703 * Kick off a purge of the outstanding lazy areas.
705 static void purge_vmap_area_lazy(void)
707 mutex_lock(&vmap_purge_lock);
708 purge_fragmented_blocks_allcpus();
709 __purge_vmap_area_lazy(ULONG_MAX, 0);
710 mutex_unlock(&vmap_purge_lock);
714 * Free a vmap area, caller ensuring that the area has been unmapped
715 * and flush_cache_vunmap had been called for the correct range
718 static void free_vmap_area_noflush(struct vmap_area *va)
722 nr_lazy = atomic_add_return((va->va_end - va->va_start) >> PAGE_SHIFT,
725 /* After this point, we may free va at any time */
726 llist_add(&va->purge_list, &vmap_purge_list);
728 if (unlikely(nr_lazy > lazy_max_pages()))
729 try_purge_vmap_area_lazy();
733 * Free and unmap a vmap area
735 static void free_unmap_vmap_area(struct vmap_area *va)
737 flush_cache_vunmap(va->va_start, va->va_end);
739 if (debug_pagealloc_enabled())
740 flush_tlb_kernel_range(va->va_start, va->va_end);
742 free_vmap_area_noflush(va);
745 static struct vmap_area *find_vmap_area(unsigned long addr)
747 struct vmap_area *va;
749 spin_lock(&vmap_area_lock);
750 va = __find_vmap_area(addr);
751 spin_unlock(&vmap_area_lock);
756 /*** Per cpu kva allocator ***/
759 * vmap space is limited especially on 32 bit architectures. Ensure there is
760 * room for at least 16 percpu vmap blocks per CPU.
763 * If we had a constant VMALLOC_START and VMALLOC_END, we'd like to be able
764 * to #define VMALLOC_SPACE (VMALLOC_END-VMALLOC_START). Guess
765 * instead (we just need a rough idea)
767 #if BITS_PER_LONG == 32
768 #define VMALLOC_SPACE (128UL*1024*1024)
770 #define VMALLOC_SPACE (128UL*1024*1024*1024)
773 #define VMALLOC_PAGES (VMALLOC_SPACE / PAGE_SIZE)
774 #define VMAP_MAX_ALLOC BITS_PER_LONG /* 256K with 4K pages */
775 #define VMAP_BBMAP_BITS_MAX 1024 /* 4MB with 4K pages */
776 #define VMAP_BBMAP_BITS_MIN (VMAP_MAX_ALLOC*2)
777 #define VMAP_MIN(x, y) ((x) < (y) ? (x) : (y)) /* can't use min() */
778 #define VMAP_MAX(x, y) ((x) > (y) ? (x) : (y)) /* can't use max() */
779 #define VMAP_BBMAP_BITS \
780 VMAP_MIN(VMAP_BBMAP_BITS_MAX, \
781 VMAP_MAX(VMAP_BBMAP_BITS_MIN, \
782 VMALLOC_PAGES / roundup_pow_of_two(NR_CPUS) / 16))
784 #define VMAP_BLOCK_SIZE (VMAP_BBMAP_BITS * PAGE_SIZE)
786 static bool vmap_initialized __read_mostly = false;
788 struct vmap_block_queue {
790 struct list_head free;
795 struct vmap_area *va;
796 unsigned long free, dirty;
797 unsigned long dirty_min, dirty_max; /*< dirty range */
798 struct list_head free_list;
799 struct rcu_head rcu_head;
800 struct list_head purge;
803 /* Queue of free and dirty vmap blocks, for allocation and flushing purposes */
804 static DEFINE_PER_CPU(struct vmap_block_queue, vmap_block_queue);
807 * Radix tree of vmap blocks, indexed by address, to quickly find a vmap block
808 * in the free path. Could get rid of this if we change the API to return a
809 * "cookie" from alloc, to be passed to free. But no big deal yet.
811 static DEFINE_SPINLOCK(vmap_block_tree_lock);
812 static RADIX_TREE(vmap_block_tree, GFP_ATOMIC);
815 * We should probably have a fallback mechanism to allocate virtual memory
816 * out of partially filled vmap blocks. However vmap block sizing should be
817 * fairly reasonable according to the vmalloc size, so it shouldn't be a
821 static unsigned long addr_to_vb_idx(unsigned long addr)
823 addr -= VMALLOC_START & ~(VMAP_BLOCK_SIZE-1);
824 addr /= VMAP_BLOCK_SIZE;
828 static void *vmap_block_vaddr(unsigned long va_start, unsigned long pages_off)
832 addr = va_start + (pages_off << PAGE_SHIFT);
833 BUG_ON(addr_to_vb_idx(addr) != addr_to_vb_idx(va_start));
838 * new_vmap_block - allocates new vmap_block and occupies 2^order pages in this
839 * block. Of course pages number can't exceed VMAP_BBMAP_BITS
840 * @order: how many 2^order pages should be occupied in newly allocated block
841 * @gfp_mask: flags for the page level allocator
843 * Returns: virtual address in a newly allocated block or ERR_PTR(-errno)
845 static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
847 struct vmap_block_queue *vbq;
848 struct vmap_block *vb;
849 struct vmap_area *va;
850 unsigned long vb_idx;
854 node = numa_node_id();
856 vb = kmalloc_node(sizeof(struct vmap_block),
857 gfp_mask & GFP_RECLAIM_MASK, node);
859 return ERR_PTR(-ENOMEM);
861 va = alloc_vmap_area(VMAP_BLOCK_SIZE, VMAP_BLOCK_SIZE,
862 VMALLOC_START, VMALLOC_END,
869 err = radix_tree_preload(gfp_mask);
876 vaddr = vmap_block_vaddr(va->va_start, 0);
877 spin_lock_init(&vb->lock);
879 /* At least something should be left free */
880 BUG_ON(VMAP_BBMAP_BITS <= (1UL << order));
881 vb->free = VMAP_BBMAP_BITS - (1UL << order);
883 vb->dirty_min = VMAP_BBMAP_BITS;
885 INIT_LIST_HEAD(&vb->free_list);
887 vb_idx = addr_to_vb_idx(va->va_start);
888 spin_lock(&vmap_block_tree_lock);
889 err = radix_tree_insert(&vmap_block_tree, vb_idx, vb);
890 spin_unlock(&vmap_block_tree_lock);
892 radix_tree_preload_end();
894 vbq = &get_cpu_var(vmap_block_queue);
895 spin_lock(&vbq->lock);
896 list_add_tail_rcu(&vb->free_list, &vbq->free);
897 spin_unlock(&vbq->lock);
898 put_cpu_var(vmap_block_queue);
903 static void free_vmap_block(struct vmap_block *vb)
905 struct vmap_block *tmp;
906 unsigned long vb_idx;
908 vb_idx = addr_to_vb_idx(vb->va->va_start);
909 spin_lock(&vmap_block_tree_lock);
910 tmp = radix_tree_delete(&vmap_block_tree, vb_idx);
911 spin_unlock(&vmap_block_tree_lock);
914 free_vmap_area_noflush(vb->va);
915 kfree_rcu(vb, rcu_head);
918 static void purge_fragmented_blocks(int cpu)
921 struct vmap_block *vb;
922 struct vmap_block *n_vb;
923 struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);
926 list_for_each_entry_rcu(vb, &vbq->free, free_list) {
928 if (!(vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS))
931 spin_lock(&vb->lock);
932 if (vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS) {
933 vb->free = 0; /* prevent further allocs after releasing lock */
934 vb->dirty = VMAP_BBMAP_BITS; /* prevent purging it again */
936 vb->dirty_max = VMAP_BBMAP_BITS;
937 spin_lock(&vbq->lock);
938 list_del_rcu(&vb->free_list);
939 spin_unlock(&vbq->lock);
940 spin_unlock(&vb->lock);
941 list_add_tail(&vb->purge, &purge);
943 spin_unlock(&vb->lock);
947 list_for_each_entry_safe(vb, n_vb, &purge, purge) {
948 list_del(&vb->purge);
953 static void purge_fragmented_blocks_allcpus(void)
957 for_each_possible_cpu(cpu)
958 purge_fragmented_blocks(cpu);
961 static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
963 struct vmap_block_queue *vbq;
964 struct vmap_block *vb;
968 BUG_ON(offset_in_page(size));
969 BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
970 if (WARN_ON(size == 0)) {
972 * Allocating 0 bytes isn't what caller wants since
973 * get_order(0) returns funny result. Just warn and terminate
978 order = get_order(size);
981 vbq = &get_cpu_var(vmap_block_queue);
982 list_for_each_entry_rcu(vb, &vbq->free, free_list) {
983 unsigned long pages_off;
985 spin_lock(&vb->lock);
986 if (vb->free < (1UL << order)) {
987 spin_unlock(&vb->lock);
991 pages_off = VMAP_BBMAP_BITS - vb->free;
992 vaddr = vmap_block_vaddr(vb->va->va_start, pages_off);
993 vb->free -= 1UL << order;
995 spin_lock(&vbq->lock);
996 list_del_rcu(&vb->free_list);
997 spin_unlock(&vbq->lock);
1000 spin_unlock(&vb->lock);
1004 put_cpu_var(vmap_block_queue);
1007 /* Allocate new block if nothing was found */
1009 vaddr = new_vmap_block(order, gfp_mask);
1014 static void vb_free(const void *addr, unsigned long size)
1016 unsigned long offset;
1017 unsigned long vb_idx;
1019 struct vmap_block *vb;
1021 BUG_ON(offset_in_page(size));
1022 BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
1024 flush_cache_vunmap((unsigned long)addr, (unsigned long)addr + size);
1026 order = get_order(size);
1028 offset = (unsigned long)addr & (VMAP_BLOCK_SIZE - 1);
1029 offset >>= PAGE_SHIFT;
1031 vb_idx = addr_to_vb_idx((unsigned long)addr);
1033 vb = radix_tree_lookup(&vmap_block_tree, vb_idx);
1037 vunmap_page_range((unsigned long)addr, (unsigned long)addr + size);
1039 if (debug_pagealloc_enabled())
1040 flush_tlb_kernel_range((unsigned long)addr,
1041 (unsigned long)addr + size);
1043 spin_lock(&vb->lock);
1045 /* Expand dirty range */
1046 vb->dirty_min = min(vb->dirty_min, offset);
1047 vb->dirty_max = max(vb->dirty_max, offset + (1UL << order));
1049 vb->dirty += 1UL << order;
1050 if (vb->dirty == VMAP_BBMAP_BITS) {
1052 spin_unlock(&vb->lock);
1053 free_vmap_block(vb);
1055 spin_unlock(&vb->lock);
1059 * vm_unmap_aliases - unmap outstanding lazy aliases in the vmap layer
1061 * The vmap/vmalloc layer lazily flushes kernel virtual mappings primarily
1062 * to amortize TLB flushing overheads. What this means is that any page you
1063 * have now, may, in a former life, have been mapped into kernel virtual
1064 * address by the vmap layer and so there might be some CPUs with TLB entries
1065 * still referencing that page (additional to the regular 1:1 kernel mapping).
1067 * vm_unmap_aliases flushes all such lazy mappings. After it returns, we can
1068 * be sure that none of the pages we have control over will have any aliases
1069 * from the vmap layer.
1071 void vm_unmap_aliases(void)
1073 unsigned long start = ULONG_MAX, end = 0;
1077 if (unlikely(!vmap_initialized))
1082 for_each_possible_cpu(cpu) {
1083 struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);
1084 struct vmap_block *vb;
1087 list_for_each_entry_rcu(vb, &vbq->free, free_list) {
1088 spin_lock(&vb->lock);
1090 unsigned long va_start = vb->va->va_start;
1093 s = va_start + (vb->dirty_min << PAGE_SHIFT);
1094 e = va_start + (vb->dirty_max << PAGE_SHIFT);
1096 start = min(s, start);
1101 spin_unlock(&vb->lock);
1106 mutex_lock(&vmap_purge_lock);
1107 purge_fragmented_blocks_allcpus();
1108 if (!__purge_vmap_area_lazy(start, end) && flush)
1109 flush_tlb_kernel_range(start, end);
1110 mutex_unlock(&vmap_purge_lock);
1112 EXPORT_SYMBOL_GPL(vm_unmap_aliases);
1115 * vm_unmap_ram - unmap linear kernel address space set up by vm_map_ram
1116 * @mem: the pointer returned by vm_map_ram
1117 * @count: the count passed to that vm_map_ram call (cannot unmap partial)
1119 void vm_unmap_ram(const void *mem, unsigned int count)
1121 unsigned long size = (unsigned long)count << PAGE_SHIFT;
1122 unsigned long addr = (unsigned long)mem;
1123 struct vmap_area *va;
1127 BUG_ON(addr < VMALLOC_START);
1128 BUG_ON(addr > VMALLOC_END);
1129 BUG_ON(!PAGE_ALIGNED(addr));
1131 if (likely(count <= VMAP_MAX_ALLOC)) {
1132 debug_check_no_locks_freed(mem, size);
1137 va = find_vmap_area(addr);
1139 debug_check_no_locks_freed((void *)va->va_start,
1140 (va->va_end - va->va_start));
1141 free_unmap_vmap_area(va);
1143 EXPORT_SYMBOL(vm_unmap_ram);
1146 * vm_map_ram - map pages linearly into kernel virtual address (vmalloc space)
1147 * @pages: an array of pointers to the pages to be mapped
1148 * @count: number of pages
1149 * @node: prefer to allocate data structures on this node
1150 * @prot: memory protection to use. PAGE_KERNEL for regular RAM
1152 * If you use this function for less than VMAP_MAX_ALLOC pages, it could be
1153 * faster than vmap so it's good. But if you mix long-life and short-life
1154 * objects with vm_map_ram(), it could consume lots of address space through
1155 * fragmentation (especially on a 32bit machine). You could see failures in
1156 * the end. Please use this function for short-lived objects.
1158 * Returns: a pointer to the address that has been mapped, or %NULL on failure
1160 void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot)
1162 unsigned long size = (unsigned long)count << PAGE_SHIFT;
1166 if (likely(count <= VMAP_MAX_ALLOC)) {
1167 mem = vb_alloc(size, GFP_KERNEL);
1170 addr = (unsigned long)mem;
1172 struct vmap_area *va;
1173 va = alloc_vmap_area(size, PAGE_SIZE,
1174 VMALLOC_START, VMALLOC_END, node, GFP_KERNEL);
1178 addr = va->va_start;
1181 if (vmap_page_range(addr, addr + size, prot, pages) < 0) {
1182 vm_unmap_ram(mem, count);
1187 EXPORT_SYMBOL(vm_map_ram);
1189 static struct vm_struct *vmlist __initdata;
1191 * vm_area_add_early - add vmap area early during boot
1192 * @vm: vm_struct to add
1194 * This function is used to add fixed kernel vm area to vmlist before
1195 * vmalloc_init() is called. @vm->addr, @vm->size, and @vm->flags
1196 * should contain proper values and the other fields should be zero.
1198 * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
1200 void __init vm_area_add_early(struct vm_struct *vm)
1202 struct vm_struct *tmp, **p;
1204 BUG_ON(vmap_initialized);
1205 for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) {
1206 if (tmp->addr >= vm->addr) {
1207 BUG_ON(tmp->addr < vm->addr + vm->size);
1210 BUG_ON(tmp->addr + tmp->size > vm->addr);
1217 * vm_area_register_early - register vmap area early during boot
1218 * @vm: vm_struct to register
1219 * @align: requested alignment
1221 * This function is used to register kernel vm area before
1222 * vmalloc_init() is called. @vm->size and @vm->flags should contain
1223 * proper values on entry and other fields should be zero. On return,
1224 * vm->addr contains the allocated address.
1226 * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
1228 void __init vm_area_register_early(struct vm_struct *vm, size_t align)
1230 static size_t vm_init_off __initdata;
1233 addr = ALIGN(VMALLOC_START + vm_init_off, align);
1234 vm_init_off = PFN_ALIGN(addr + vm->size) - VMALLOC_START;
1236 vm->addr = (void *)addr;
1238 vm_area_add_early(vm);
1241 void __init vmalloc_init(void)
1243 struct vmap_area *va;
1244 struct vm_struct *tmp;
1247 for_each_possible_cpu(i) {
1248 struct vmap_block_queue *vbq;
1249 struct vfree_deferred *p;
1251 vbq = &per_cpu(vmap_block_queue, i);
1252 spin_lock_init(&vbq->lock);
1253 INIT_LIST_HEAD(&vbq->free);
1254 p = &per_cpu(vfree_deferred, i);
1255 init_llist_head(&p->list);
1256 INIT_WORK(&p->wq, free_work);
1259 /* Import existing vmlist entries. */
1260 for (tmp = vmlist; tmp; tmp = tmp->next) {
1261 va = kzalloc(sizeof(struct vmap_area), GFP_NOWAIT);
1262 va->flags = VM_VM_AREA;
1263 va->va_start = (unsigned long)tmp->addr;
1264 va->va_end = va->va_start + tmp->size;
1266 __insert_vmap_area(va);
1269 vmap_area_pcpu_hole = VMALLOC_END;
1271 vmap_initialized = true;
1275 * map_kernel_range_noflush - map kernel VM area with the specified pages
1276 * @addr: start of the VM area to map
1277 * @size: size of the VM area to map
1278 * @prot: page protection flags to use
1279 * @pages: pages to map
1281 * Map PFN_UP(@size) pages at @addr. The VM area @addr and @size
1282 * specify should have been allocated using get_vm_area() and its
1286 * This function does NOT do any cache flushing. The caller is
1287 * responsible for calling flush_cache_vmap() on to-be-mapped areas
1288 * before calling this function.
1291 * The number of pages mapped on success, -errno on failure.
1293 int map_kernel_range_noflush(unsigned long addr, unsigned long size,
1294 pgprot_t prot, struct page **pages)
1296 return vmap_page_range_noflush(addr, addr + size, prot, pages);
1300 * unmap_kernel_range_noflush - unmap kernel VM area
1301 * @addr: start of the VM area to unmap
1302 * @size: size of the VM area to unmap
1304 * Unmap PFN_UP(@size) pages at @addr. The VM area @addr and @size
1305 * specify should have been allocated using get_vm_area() and its
1309 * This function does NOT do any cache flushing. The caller is
1310 * responsible for calling flush_cache_vunmap() on to-be-mapped areas
1311 * before calling this function and flush_tlb_kernel_range() after.
1313 void unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
1315 vunmap_page_range(addr, addr + size);
1317 EXPORT_SYMBOL_GPL(unmap_kernel_range_noflush);
1320 * unmap_kernel_range - unmap kernel VM area and flush cache and TLB
1321 * @addr: start of the VM area to unmap
1322 * @size: size of the VM area to unmap
1324 * Similar to unmap_kernel_range_noflush() but flushes vcache before
1325 * the unmapping and tlb after.
1327 void unmap_kernel_range(unsigned long addr, unsigned long size)
1329 unsigned long end = addr + size;
1331 flush_cache_vunmap(addr, end);
1332 vunmap_page_range(addr, end);
1333 flush_tlb_kernel_range(addr, end);
1335 EXPORT_SYMBOL_GPL(unmap_kernel_range);
1337 int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page **pages)
1339 unsigned long addr = (unsigned long)area->addr;
1340 unsigned long end = addr + get_vm_area_size(area);
1343 err = vmap_page_range(addr, end, prot, pages);
1345 return err > 0 ? 0 : err;
1347 EXPORT_SYMBOL_GPL(map_vm_area);
1349 static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
1350 unsigned long flags, const void *caller)
1352 spin_lock(&vmap_area_lock);
1354 vm->addr = (void *)va->va_start;
1355 vm->size = va->va_end - va->va_start;
1356 vm->caller = caller;
1358 va->flags |= VM_VM_AREA;
1359 spin_unlock(&vmap_area_lock);
1362 static void clear_vm_uninitialized_flag(struct vm_struct *vm)
1365 * Before removing VM_UNINITIALIZED,
1366 * we should make sure that vm has proper values.
1367 * Pair with smp_rmb() in show_numa_info().
1370 vm->flags &= ~VM_UNINITIALIZED;
1373 static struct vm_struct *__get_vm_area_node(unsigned long size,
1374 unsigned long align, unsigned long flags, unsigned long start,
1375 unsigned long end, int node, gfp_t gfp_mask, const void *caller)
1377 struct vmap_area *va;
1378 struct vm_struct *area;
1380 BUG_ON(in_interrupt());
1381 size = PAGE_ALIGN(size);
1382 if (unlikely(!size))
1385 if (flags & VM_IOREMAP)
1386 align = 1ul << clamp_t(int, get_count_order_long(size),
1387 PAGE_SHIFT, IOREMAP_MAX_ORDER);
1389 area = kzalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node);
1390 if (unlikely(!area))
1393 if (!(flags & VM_NO_GUARD))
1396 va = alloc_vmap_area(size, align, start, end, node, gfp_mask);
1402 setup_vmalloc_vm(area, va, flags, caller);
1407 struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
1408 unsigned long start, unsigned long end)
1410 return __get_vm_area_node(size, 1, flags, start, end, NUMA_NO_NODE,
1411 GFP_KERNEL, __builtin_return_address(0));
1413 EXPORT_SYMBOL_GPL(__get_vm_area);
1415 struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long flags,
1416 unsigned long start, unsigned long end,
1419 return __get_vm_area_node(size, 1, flags, start, end, NUMA_NO_NODE,
1420 GFP_KERNEL, caller);
1424 * get_vm_area - reserve a contiguous kernel virtual area
1425 * @size: size of the area
1426 * @flags: %VM_IOREMAP for I/O mappings or VM_ALLOC
1428 * Search an area of @size in the kernel virtual mapping area,
1429 * and reserved it for out purposes. Returns the area descriptor
1430 * on success or %NULL on failure.
1432 struct vm_struct *get_vm_area(unsigned long size, unsigned long flags)
1434 return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END,
1435 NUMA_NO_NODE, GFP_KERNEL,
1436 __builtin_return_address(0));
1439 struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
1442 return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END,
1443 NUMA_NO_NODE, GFP_KERNEL, caller);
1447 * find_vm_area - find a continuous kernel virtual area
1448 * @addr: base address
1450 * Search for the kernel VM area starting at @addr, and return it.
1451 * It is up to the caller to do all required locking to keep the returned
1454 struct vm_struct *find_vm_area(const void *addr)
1456 struct vmap_area *va;
1458 va = find_vmap_area((unsigned long)addr);
1459 if (va && va->flags & VM_VM_AREA)
1466 * remove_vm_area - find and remove a continuous kernel virtual area
1467 * @addr: base address
1469 * Search for the kernel VM area starting at @addr, and remove it.
1470 * This function returns the found VM area, but using it is NOT safe
1471 * on SMP machines, except for its size or flags.
1473 struct vm_struct *remove_vm_area(const void *addr)
1475 struct vmap_area *va;
1479 va = find_vmap_area((unsigned long)addr);
1480 if (va && va->flags & VM_VM_AREA) {
1481 struct vm_struct *vm = va->vm;
1483 spin_lock(&vmap_area_lock);
1485 va->flags &= ~VM_VM_AREA;
1486 va->flags |= VM_LAZY_FREE;
1487 spin_unlock(&vmap_area_lock);
1489 kasan_free_shadow(vm);
1490 free_unmap_vmap_area(va);
1497 static void __vunmap(const void *addr, int deallocate_pages)
1499 struct vm_struct *area;
1504 if (WARN(!PAGE_ALIGNED(addr), "Trying to vfree() bad address (%p)\n",
1508 area = find_vm_area(addr);
1509 if (unlikely(!area)) {
1510 WARN(1, KERN_ERR "Trying to vfree() nonexistent vm area (%p)\n",
1515 debug_check_no_locks_freed(area->addr, get_vm_area_size(area));
1516 debug_check_no_obj_freed(area->addr, get_vm_area_size(area));
1518 remove_vm_area(addr);
1519 if (deallocate_pages) {
1522 for (i = 0; i < area->nr_pages; i++) {
1523 struct page *page = area->pages[i];
1526 __free_pages(page, 0);
1529 kvfree(area->pages);
1536 static inline void __vfree_deferred(const void *addr)
1539 * Use raw_cpu_ptr() because this can be called from preemptible
1540 * context. Preemption is absolutely fine here, because the llist_add()
1541 * implementation is lockless, so it works even if we are adding to
1542 * nother cpu's list. schedule_work() should be fine with this too.
1544 struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);
1546 if (llist_add((struct llist_node *)addr, &p->list))
1547 schedule_work(&p->wq);
1551 * vfree_atomic - release memory allocated by vmalloc()
1552 * @addr: memory base address
1554 * This one is just like vfree() but can be called in any atomic context
1557 void vfree_atomic(const void *addr)
1561 kmemleak_free(addr);
1565 __vfree_deferred(addr);
1568 static void __vfree(const void *addr)
1570 if (unlikely(in_interrupt()))
1571 __vfree_deferred(addr);
1577 * vfree - release memory allocated by vmalloc()
1578 * @addr: memory base address
1580 * Free the virtually continuous memory area starting at @addr, as
1581 * obtained from vmalloc(), vmalloc_32() or __vmalloc(). If @addr is
1582 * NULL, no operation is performed.
1584 * Must not be called in NMI context (strictly speaking, only if we don't
1585 * have CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG, but making the calling
1586 * conventions for vfree() arch-depenedent would be a really bad idea)
1588 * May sleep if called *not* from interrupt context.
1590 * NOTE: assumes that the object at @addr has a size >= sizeof(llist_node)
1592 void vfree(const void *addr)
1596 kmemleak_free(addr);
1598 might_sleep_if(!in_interrupt());
1605 EXPORT_SYMBOL(vfree);
1608 * vunmap - release virtual mapping obtained by vmap()
1609 * @addr: memory base address
1611 * Free the virtually contiguous memory area starting at @addr,
1612 * which was created from the page array passed to vmap().
1614 * Must not be called in interrupt context.
1616 void vunmap(const void *addr)
1618 BUG_ON(in_interrupt());
1623 EXPORT_SYMBOL(vunmap);
1626 * vmap - map an array of pages into virtually contiguous space
1627 * @pages: array of page pointers
1628 * @count: number of pages to map
1629 * @flags: vm_area->flags
1630 * @prot: page protection for the mapping
1632 * Maps @count pages from @pages into contiguous kernel virtual
1635 void *vmap(struct page **pages, unsigned int count,
1636 unsigned long flags, pgprot_t prot)
1638 struct vm_struct *area;
1639 unsigned long size; /* In bytes */
1643 if (count > totalram_pages())
1646 size = (unsigned long)count << PAGE_SHIFT;
1647 area = get_vm_area_caller(size, flags, __builtin_return_address(0));
1651 if (map_vm_area(area, prot, pages)) {
1658 EXPORT_SYMBOL(vmap);
1660 static void *__vmalloc_node(unsigned long size, unsigned long align,
1661 gfp_t gfp_mask, pgprot_t prot,
1662 int node, const void *caller);
1663 static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
1664 pgprot_t prot, int node)
1666 struct page **pages;
1667 unsigned int nr_pages, array_size, i;
1668 const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
1669 const gfp_t alloc_mask = gfp_mask | __GFP_NOWARN;
1670 const gfp_t highmem_mask = (gfp_mask & (GFP_DMA | GFP_DMA32)) ?
1674 nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
1675 array_size = (nr_pages * sizeof(struct page *));
1677 area->nr_pages = nr_pages;
1678 /* Please note that the recursion is strictly bounded. */
1679 if (array_size > PAGE_SIZE) {
1680 pages = __vmalloc_node(array_size, 1, nested_gfp|highmem_mask,
1681 PAGE_KERNEL, node, area->caller);
1683 pages = kmalloc_node(array_size, nested_gfp, node);
1685 area->pages = pages;
1687 remove_vm_area(area->addr);
1692 for (i = 0; i < area->nr_pages; i++) {
1695 if (node == NUMA_NO_NODE)
1696 page = alloc_page(alloc_mask|highmem_mask);
1698 page = alloc_pages_node(node, alloc_mask|highmem_mask, 0);
1700 if (unlikely(!page)) {
1701 /* Successfully allocated i pages, free them in __vunmap() */
1705 area->pages[i] = page;
1706 if (gfpflags_allow_blocking(gfp_mask|highmem_mask))
1710 if (map_vm_area(area, prot, pages))
1715 warn_alloc(gfp_mask, NULL,
1716 "vmalloc: allocation failure, allocated %ld of %ld bytes",
1717 (area->nr_pages*PAGE_SIZE), area->size);
1718 __vfree(area->addr);
1723 * __vmalloc_node_range - allocate virtually contiguous memory
1724 * @size: allocation size
1725 * @align: desired alignment
1726 * @start: vm area range start
1727 * @end: vm area range end
1728 * @gfp_mask: flags for the page level allocator
1729 * @prot: protection mask for the allocated pages
1730 * @vm_flags: additional vm area flags (e.g. %VM_NO_GUARD)
1731 * @node: node to use for allocation or NUMA_NO_NODE
1732 * @caller: caller's return address
1734 * Allocate enough pages to cover @size from the page level
1735 * allocator with @gfp_mask flags. Map them into contiguous
1736 * kernel virtual space, using a pagetable protection of @prot.
1738 void *__vmalloc_node_range(unsigned long size, unsigned long align,
1739 unsigned long start, unsigned long end, gfp_t gfp_mask,
1740 pgprot_t prot, unsigned long vm_flags, int node,
1743 struct vm_struct *area;
1745 unsigned long real_size = size;
1747 size = PAGE_ALIGN(size);
1748 if (!size || (size >> PAGE_SHIFT) > totalram_pages())
1751 area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNINITIALIZED |
1752 vm_flags, start, end, node, gfp_mask, caller);
1756 addr = __vmalloc_area_node(area, gfp_mask, prot, node);
1761 * In this function, newly allocated vm_struct has VM_UNINITIALIZED
1762 * flag. It means that vm_struct is not fully initialized.
1763 * Now, it is fully initialized, so remove this flag here.
1765 clear_vm_uninitialized_flag(area);
1767 kmemleak_vmalloc(area, size, gfp_mask);
1772 warn_alloc(gfp_mask, NULL,
1773 "vmalloc: allocation failure: %lu bytes", real_size);
1778 * This is only for performance analysis of vmalloc and stress purpose.
1779 * It is required by vmalloc test module, therefore do not use it other
1782 #ifdef CONFIG_TEST_VMALLOC_MODULE
1783 EXPORT_SYMBOL_GPL(__vmalloc_node_range);
1787 * __vmalloc_node - allocate virtually contiguous memory
1788 * @size: allocation size
1789 * @align: desired alignment
1790 * @gfp_mask: flags for the page level allocator
1791 * @prot: protection mask for the allocated pages
1792 * @node: node to use for allocation or NUMA_NO_NODE
1793 * @caller: caller's return address
1795 * Allocate enough pages to cover @size from the page level
1796 * allocator with @gfp_mask flags. Map them into contiguous
1797 * kernel virtual space, using a pagetable protection of @prot.
1799 * Reclaim modifiers in @gfp_mask - __GFP_NORETRY, __GFP_RETRY_MAYFAIL
1800 * and __GFP_NOFAIL are not supported
1802 * Any use of gfp flags outside of GFP_KERNEL should be consulted
1806 static void *__vmalloc_node(unsigned long size, unsigned long align,
1807 gfp_t gfp_mask, pgprot_t prot,
1808 int node, const void *caller)
1810 return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
1811 gfp_mask, prot, 0, node, caller);
1814 void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)
1816 return __vmalloc_node(size, 1, gfp_mask, prot, NUMA_NO_NODE,
1817 __builtin_return_address(0));
1819 EXPORT_SYMBOL(__vmalloc);
1821 static inline void *__vmalloc_node_flags(unsigned long size,
1822 int node, gfp_t flags)
1824 return __vmalloc_node(size, 1, flags, PAGE_KERNEL,
1825 node, __builtin_return_address(0));
1829 void *__vmalloc_node_flags_caller(unsigned long size, int node, gfp_t flags,
1832 return __vmalloc_node(size, 1, flags, PAGE_KERNEL, node, caller);
1836 * vmalloc - allocate virtually contiguous memory
1837 * @size: allocation size
1838 * Allocate enough pages to cover @size from the page level
1839 * allocator and map them into contiguous kernel virtual space.
1841 * For tight control over page level allocator and protection flags
1842 * use __vmalloc() instead.
1844 void *vmalloc(unsigned long size)
1846 return __vmalloc_node_flags(size, NUMA_NO_NODE,
1849 EXPORT_SYMBOL(vmalloc);
1852 * vzalloc - allocate virtually contiguous memory with zero fill
1853 * @size: allocation size
1854 * Allocate enough pages to cover @size from the page level
1855 * allocator and map them into contiguous kernel virtual space.
1856 * The memory allocated is set to zero.
1858 * For tight control over page level allocator and protection flags
1859 * use __vmalloc() instead.
1861 void *vzalloc(unsigned long size)
1863 return __vmalloc_node_flags(size, NUMA_NO_NODE,
1864 GFP_KERNEL | __GFP_ZERO);
1866 EXPORT_SYMBOL(vzalloc);
1869 * vmalloc_user - allocate zeroed virtually contiguous memory for userspace
1870 * @size: allocation size
1872 * The resulting memory area is zeroed so it can be mapped to userspace
1873 * without leaking data.
1875 void *vmalloc_user(unsigned long size)
1877 return __vmalloc_node_range(size, SHMLBA, VMALLOC_START, VMALLOC_END,
1878 GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL,
1879 VM_USERMAP, NUMA_NO_NODE,
1880 __builtin_return_address(0));
1882 EXPORT_SYMBOL(vmalloc_user);
1885 * vmalloc_node - allocate memory on a specific node
1886 * @size: allocation size
1889 * Allocate enough pages to cover @size from the page level
1890 * allocator and map them into contiguous kernel virtual space.
1892 * For tight control over page level allocator and protection flags
1893 * use __vmalloc() instead.
1895 void *vmalloc_node(unsigned long size, int node)
1897 return __vmalloc_node(size, 1, GFP_KERNEL, PAGE_KERNEL,
1898 node, __builtin_return_address(0));
1900 EXPORT_SYMBOL(vmalloc_node);
1903 * vzalloc_node - allocate memory on a specific node with zero fill
1904 * @size: allocation size
1907 * Allocate enough pages to cover @size from the page level
1908 * allocator and map them into contiguous kernel virtual space.
1909 * The memory allocated is set to zero.
1911 * For tight control over page level allocator and protection flags
1912 * use __vmalloc_node() instead.
1914 void *vzalloc_node(unsigned long size, int node)
1916 return __vmalloc_node_flags(size, node,
1917 GFP_KERNEL | __GFP_ZERO);
1919 EXPORT_SYMBOL(vzalloc_node);
1922 * vmalloc_exec - allocate virtually contiguous, executable memory
1923 * @size: allocation size
1925 * Kernel-internal function to allocate enough pages to cover @size
1926 * the page level allocator and map them into contiguous and
1927 * executable kernel virtual space.
1929 * For tight control over page level allocator and protection flags
1930 * use __vmalloc() instead.
1933 void *vmalloc_exec(unsigned long size)
1935 return __vmalloc_node(size, 1, GFP_KERNEL, PAGE_KERNEL_EXEC,
1936 NUMA_NO_NODE, __builtin_return_address(0));
1939 #if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)
1940 #define GFP_VMALLOC32 (GFP_DMA32 | GFP_KERNEL)
1941 #elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA)
1942 #define GFP_VMALLOC32 (GFP_DMA | GFP_KERNEL)
1945 * 64b systems should always have either DMA or DMA32 zones. For others
1946 * GFP_DMA32 should do the right thing and use the normal zone.
1948 #define GFP_VMALLOC32 GFP_DMA32 | GFP_KERNEL
1952 * vmalloc_32 - allocate virtually contiguous memory (32bit addressable)
1953 * @size: allocation size
1955 * Allocate enough 32bit PA addressable pages to cover @size from the
1956 * page level allocator and map them into contiguous kernel virtual space.
1958 void *vmalloc_32(unsigned long size)
1960 return __vmalloc_node(size, 1, GFP_VMALLOC32, PAGE_KERNEL,
1961 NUMA_NO_NODE, __builtin_return_address(0));
1963 EXPORT_SYMBOL(vmalloc_32);
1966 * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory
1967 * @size: allocation size
1969 * The resulting memory area is 32bit addressable and zeroed so it can be
1970 * mapped to userspace without leaking data.
1972 void *vmalloc_32_user(unsigned long size)
1974 return __vmalloc_node_range(size, SHMLBA, VMALLOC_START, VMALLOC_END,
1975 GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL,
1976 VM_USERMAP, NUMA_NO_NODE,
1977 __builtin_return_address(0));
1979 EXPORT_SYMBOL(vmalloc_32_user);
1982 * small helper routine , copy contents to buf from addr.
1983 * If the page is not present, fill zero.
1986 static int aligned_vread(char *buf, char *addr, unsigned long count)
1992 unsigned long offset, length;
1994 offset = offset_in_page(addr);
1995 length = PAGE_SIZE - offset;
1998 p = vmalloc_to_page(addr);
2000 * To do safe access to this _mapped_ area, we need
2001 * lock. But adding lock here means that we need to add
2002 * overhead of vmalloc()/vfree() calles for this _debug_
2003 * interface, rarely used. Instead of that, we'll use
2004 * kmap() and get small overhead in this access function.
2008 * we can expect USER0 is not used (see vread/vwrite's
2009 * function description)
2011 void *map = kmap_atomic(p);
2012 memcpy(buf, map + offset, length);
2015 memset(buf, 0, length);
2025 static int aligned_vwrite(char *buf, char *addr, unsigned long count)
2031 unsigned long offset, length;
2033 offset = offset_in_page(addr);
2034 length = PAGE_SIZE - offset;
2037 p = vmalloc_to_page(addr);
2039 * To do safe access to this _mapped_ area, we need
2040 * lock. But adding lock here means that we need to add
2041 * overhead of vmalloc()/vfree() calles for this _debug_
2042 * interface, rarely used. Instead of that, we'll use
2043 * kmap() and get small overhead in this access function.
2047 * we can expect USER0 is not used (see vread/vwrite's
2048 * function description)
2050 void *map = kmap_atomic(p);
2051 memcpy(map + offset, buf, length);
2063 * vread() - read vmalloc area in a safe way.
2064 * @buf: buffer for reading data
2065 * @addr: vm address.
2066 * @count: number of bytes to be read.
2068 * Returns # of bytes which addr and buf should be increased.
2069 * (same number to @count). Returns 0 if [addr...addr+count) doesn't
2070 * includes any intersect with alive vmalloc area.
2072 * This function checks that addr is a valid vmalloc'ed area, and
2073 * copy data from that area to a given buffer. If the given memory range
2074 * of [addr...addr+count) includes some valid address, data is copied to
2075 * proper area of @buf. If there are memory holes, they'll be zero-filled.
2076 * IOREMAP area is treated as memory hole and no copy is done.
2078 * If [addr...addr+count) doesn't includes any intersects with alive
2079 * vm_struct area, returns 0. @buf should be kernel's buffer.
2081 * Note: In usual ops, vread() is never necessary because the caller
2082 * should know vmalloc() area is valid and can use memcpy().
2083 * This is for routines which have to access vmalloc area without
2084 * any informaion, as /dev/kmem.
2088 long vread(char *buf, char *addr, unsigned long count)
2090 struct vmap_area *va;
2091 struct vm_struct *vm;
2092 char *vaddr, *buf_start = buf;
2093 unsigned long buflen = count;
2096 /* Don't allow overflow */
2097 if ((unsigned long) addr + count < count)
2098 count = -(unsigned long) addr;
2100 spin_lock(&vmap_area_lock);
2101 list_for_each_entry(va, &vmap_area_list, list) {
2105 if (!(va->flags & VM_VM_AREA))
2109 vaddr = (char *) vm->addr;
2110 if (addr >= vaddr + get_vm_area_size(vm))
2112 while (addr < vaddr) {
2120 n = vaddr + get_vm_area_size(vm) - addr;
2123 if (!(vm->flags & VM_IOREMAP))
2124 aligned_vread(buf, addr, n);
2125 else /* IOREMAP area is treated as memory hole */
2132 spin_unlock(&vmap_area_lock);
2134 if (buf == buf_start)
2136 /* zero-fill memory holes */
2137 if (buf != buf_start + buflen)
2138 memset(buf, 0, buflen - (buf - buf_start));
2144 * vwrite() - write vmalloc area in a safe way.
2145 * @buf: buffer for source data
2146 * @addr: vm address.
2147 * @count: number of bytes to be read.
2149 * Returns # of bytes which addr and buf should be incresed.
2150 * (same number to @count).
2151 * If [addr...addr+count) doesn't includes any intersect with valid
2152 * vmalloc area, returns 0.
2154 * This function checks that addr is a valid vmalloc'ed area, and
2155 * copy data from a buffer to the given addr. If specified range of
2156 * [addr...addr+count) includes some valid address, data is copied from
2157 * proper area of @buf. If there are memory holes, no copy to hole.
2158 * IOREMAP area is treated as memory hole and no copy is done.
2160 * If [addr...addr+count) doesn't includes any intersects with alive
2161 * vm_struct area, returns 0. @buf should be kernel's buffer.
2163 * Note: In usual ops, vwrite() is never necessary because the caller
2164 * should know vmalloc() area is valid and can use memcpy().
2165 * This is for routines which have to access vmalloc area without
2166 * any informaion, as /dev/kmem.
2169 long vwrite(char *buf, char *addr, unsigned long count)
2171 struct vmap_area *va;
2172 struct vm_struct *vm;
2174 unsigned long n, buflen;
2177 /* Don't allow overflow */
2178 if ((unsigned long) addr + count < count)
2179 count = -(unsigned long) addr;
2182 spin_lock(&vmap_area_lock);
2183 list_for_each_entry(va, &vmap_area_list, list) {
2187 if (!(va->flags & VM_VM_AREA))
2191 vaddr = (char *) vm->addr;
2192 if (addr >= vaddr + get_vm_area_size(vm))
2194 while (addr < vaddr) {
2201 n = vaddr + get_vm_area_size(vm) - addr;
2204 if (!(vm->flags & VM_IOREMAP)) {
2205 aligned_vwrite(buf, addr, n);
2213 spin_unlock(&vmap_area_lock);
2220 * remap_vmalloc_range_partial - map vmalloc pages to userspace
2221 * @vma: vma to cover
2222 * @uaddr: target user address to start at
2223 * @kaddr: virtual address of vmalloc kernel memory
2224 * @size: size of map area
2226 * Returns: 0 for success, -Exxx on failure
2228 * This function checks that @kaddr is a valid vmalloc'ed area,
2229 * and that it is big enough to cover the range starting at
2230 * @uaddr in @vma. Will return failure if that criteria isn't
2233 * Similar to remap_pfn_range() (see mm/memory.c)
2235 int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr,
2236 void *kaddr, unsigned long size)
2238 struct vm_struct *area;
2240 size = PAGE_ALIGN(size);
2242 if (!PAGE_ALIGNED(uaddr) || !PAGE_ALIGNED(kaddr))
2245 area = find_vm_area(kaddr);
2249 if (!(area->flags & VM_USERMAP))
2252 if (kaddr + size > area->addr + get_vm_area_size(area))
2256 struct page *page = vmalloc_to_page(kaddr);
2259 ret = vm_insert_page(vma, uaddr, page);
2268 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
2272 EXPORT_SYMBOL(remap_vmalloc_range_partial);
2275 * remap_vmalloc_range - map vmalloc pages to userspace
2276 * @vma: vma to cover (map full range of vma)
2277 * @addr: vmalloc memory
2278 * @pgoff: number of pages into addr before first page to map
2280 * Returns: 0 for success, -Exxx on failure
2282 * This function checks that addr is a valid vmalloc'ed area, and
2283 * that it is big enough to cover the vma. Will return failure if
2284 * that criteria isn't met.
2286 * Similar to remap_pfn_range() (see mm/memory.c)
2288 int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
2289 unsigned long pgoff)
2291 return remap_vmalloc_range_partial(vma, vma->vm_start,
2292 addr + (pgoff << PAGE_SHIFT),
2293 vma->vm_end - vma->vm_start);
2295 EXPORT_SYMBOL(remap_vmalloc_range);
2298 * Implement a stub for vmalloc_sync_all() if the architecture chose not to
2301 void __weak vmalloc_sync_all(void)
2306 static int f(pte_t *pte, pgtable_t table, unsigned long addr, void *data)
2318 * alloc_vm_area - allocate a range of kernel address space
2319 * @size: size of the area
2320 * @ptes: returns the PTEs for the address space
2322 * Returns: NULL on failure, vm_struct on success
2324 * This function reserves a range of kernel address space, and
2325 * allocates pagetables to map that range. No actual mappings
2328 * If @ptes is non-NULL, pointers to the PTEs (in init_mm)
2329 * allocated for the VM area are returned.
2331 struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes)
2333 struct vm_struct *area;
2335 area = get_vm_area_caller(size, VM_IOREMAP,
2336 __builtin_return_address(0));
2341 * This ensures that page tables are constructed for this region
2342 * of kernel virtual address space and mapped into init_mm.
2344 if (apply_to_page_range(&init_mm, (unsigned long)area->addr,
2345 size, f, ptes ? &ptes : NULL)) {
2352 EXPORT_SYMBOL_GPL(alloc_vm_area);
2354 void free_vm_area(struct vm_struct *area)
2356 struct vm_struct *ret;
2357 ret = remove_vm_area(area->addr);
2358 BUG_ON(ret != area);
2361 EXPORT_SYMBOL_GPL(free_vm_area);
2364 static struct vmap_area *node_to_va(struct rb_node *n)
2366 return rb_entry_safe(n, struct vmap_area, rb_node);
2370 * pvm_find_next_prev - find the next and prev vmap_area surrounding @end
2371 * @end: target address
2372 * @pnext: out arg for the next vmap_area
2373 * @pprev: out arg for the previous vmap_area
2375 * Returns: %true if either or both of next and prev are found,
2376 * %false if no vmap_area exists
2378 * Find vmap_areas end addresses of which enclose @end. ie. if not
2379 * NULL, *pnext->va_end > @end and *pprev->va_end <= @end.
2381 static bool pvm_find_next_prev(unsigned long end,
2382 struct vmap_area **pnext,
2383 struct vmap_area **pprev)
2385 struct rb_node *n = vmap_area_root.rb_node;
2386 struct vmap_area *va = NULL;
2389 va = rb_entry(n, struct vmap_area, rb_node);
2390 if (end < va->va_end)
2392 else if (end > va->va_end)
2401 if (va->va_end > end) {
2403 *pprev = node_to_va(rb_prev(&(*pnext)->rb_node));
2406 *pnext = node_to_va(rb_next(&(*pprev)->rb_node));
2412 * pvm_determine_end - find the highest aligned address between two vmap_areas
2413 * @pnext: in/out arg for the next vmap_area
2414 * @pprev: in/out arg for the previous vmap_area
2417 * Returns: determined end address
2419 * Find the highest aligned address between *@pnext and *@pprev below
2420 * VMALLOC_END. *@pnext and *@pprev are adjusted so that the aligned
2421 * down address is between the end addresses of the two vmap_areas.
2423 * Please note that the address returned by this function may fall
2424 * inside *@pnext vmap_area. The caller is responsible for checking
2427 static unsigned long pvm_determine_end(struct vmap_area **pnext,
2428 struct vmap_area **pprev,
2429 unsigned long align)
2431 const unsigned long vmalloc_end = VMALLOC_END & ~(align - 1);
2435 addr = min((*pnext)->va_start & ~(align - 1), vmalloc_end);
2439 while (*pprev && (*pprev)->va_end > addr) {
2441 *pprev = node_to_va(rb_prev(&(*pnext)->rb_node));
2448 * pcpu_get_vm_areas - allocate vmalloc areas for percpu allocator
2449 * @offsets: array containing offset of each area
2450 * @sizes: array containing size of each area
2451 * @nr_vms: the number of areas to allocate
2452 * @align: alignment, all entries in @offsets and @sizes must be aligned to this
2454 * Returns: kmalloc'd vm_struct pointer array pointing to allocated
2455 * vm_structs on success, %NULL on failure
2457 * Percpu allocator wants to use congruent vm areas so that it can
2458 * maintain the offsets among percpu areas. This function allocates
2459 * congruent vmalloc areas for it with GFP_KERNEL. These areas tend to
2460 * be scattered pretty far, distance between two areas easily going up
2461 * to gigabytes. To avoid interacting with regular vmallocs, these
2462 * areas are allocated from top.
2464 * Despite its complicated look, this allocator is rather simple. It
2465 * does everything top-down and scans areas from the end looking for
2466 * matching slot. While scanning, if any of the areas overlaps with
2467 * existing vmap_area, the base address is pulled down to fit the
2468 * area. Scanning is repeated till all the areas fit and then all
2469 * necessary data structures are inserted and the result is returned.
2471 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
2472 const size_t *sizes, int nr_vms,
2475 const unsigned long vmalloc_start = ALIGN(VMALLOC_START, align);
2476 const unsigned long vmalloc_end = VMALLOC_END & ~(align - 1);
2477 struct vmap_area **vas, *prev, *next;
2478 struct vm_struct **vms;
2479 int area, area2, last_area, term_area;
2480 unsigned long base, start, end, last_end;
2481 bool purged = false;
2483 /* verify parameters and allocate data structures */
2484 BUG_ON(offset_in_page(align) || !is_power_of_2(align));
2485 for (last_area = 0, area = 0; area < nr_vms; area++) {
2486 start = offsets[area];
2487 end = start + sizes[area];
2489 /* is everything aligned properly? */
2490 BUG_ON(!IS_ALIGNED(offsets[area], align));
2491 BUG_ON(!IS_ALIGNED(sizes[area], align));
2493 /* detect the area with the highest address */
2494 if (start > offsets[last_area])
2497 for (area2 = area + 1; area2 < nr_vms; area2++) {
2498 unsigned long start2 = offsets[area2];
2499 unsigned long end2 = start2 + sizes[area2];
2501 BUG_ON(start2 < end && start < end2);
2504 last_end = offsets[last_area] + sizes[last_area];
2506 if (vmalloc_end - vmalloc_start < last_end) {
2511 vms = kcalloc(nr_vms, sizeof(vms[0]), GFP_KERNEL);
2512 vas = kcalloc(nr_vms, sizeof(vas[0]), GFP_KERNEL);
2516 for (area = 0; area < nr_vms; area++) {
2517 vas[area] = kzalloc(sizeof(struct vmap_area), GFP_KERNEL);
2518 vms[area] = kzalloc(sizeof(struct vm_struct), GFP_KERNEL);
2519 if (!vas[area] || !vms[area])
2523 spin_lock(&vmap_area_lock);
2525 /* start scanning - we scan from the top, begin with the last area */
2526 area = term_area = last_area;
2527 start = offsets[area];
2528 end = start + sizes[area];
2530 if (!pvm_find_next_prev(vmap_area_pcpu_hole, &next, &prev)) {
2531 base = vmalloc_end - last_end;
2534 base = pvm_determine_end(&next, &prev, align) - end;
2537 BUG_ON(next && next->va_end <= base + end);
2538 BUG_ON(prev && prev->va_end > base + end);
2541 * base might have underflowed, add last_end before
2544 if (base + last_end < vmalloc_start + last_end) {
2545 spin_unlock(&vmap_area_lock);
2547 purge_vmap_area_lazy();
2555 * If next overlaps, move base downwards so that it's
2556 * right below next and then recheck.
2558 if (next && next->va_start < base + end) {
2559 base = pvm_determine_end(&next, &prev, align) - end;
2565 * If prev overlaps, shift down next and prev and move
2566 * base so that it's right below new next and then
2569 if (prev && prev->va_end > base + start) {
2571 prev = node_to_va(rb_prev(&next->rb_node));
2572 base = pvm_determine_end(&next, &prev, align) - end;
2578 * This area fits, move on to the previous one. If
2579 * the previous one is the terminal one, we're done.
2581 area = (area + nr_vms - 1) % nr_vms;
2582 if (area == term_area)
2584 start = offsets[area];
2585 end = start + sizes[area];
2586 pvm_find_next_prev(base + end, &next, &prev);
2589 /* we've found a fitting base, insert all va's */
2590 for (area = 0; area < nr_vms; area++) {
2591 struct vmap_area *va = vas[area];
2593 va->va_start = base + offsets[area];
2594 va->va_end = va->va_start + sizes[area];
2595 __insert_vmap_area(va);
2598 vmap_area_pcpu_hole = base + offsets[last_area];
2600 spin_unlock(&vmap_area_lock);
2602 /* insert all vm's */
2603 for (area = 0; area < nr_vms; area++)
2604 setup_vmalloc_vm(vms[area], vas[area], VM_ALLOC,
2611 for (area = 0; area < nr_vms; area++) {
2622 * pcpu_free_vm_areas - free vmalloc areas for percpu allocator
2623 * @vms: vm_struct pointer array returned by pcpu_get_vm_areas()
2624 * @nr_vms: the number of allocated areas
2626 * Free vm_structs and the array allocated by pcpu_get_vm_areas().
2628 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
2632 for (i = 0; i < nr_vms; i++)
2633 free_vm_area(vms[i]);
2636 #endif /* CONFIG_SMP */
2638 #ifdef CONFIG_PROC_FS
2639 static void *s_start(struct seq_file *m, loff_t *pos)
2640 __acquires(&vmap_area_lock)
2642 spin_lock(&vmap_area_lock);
2643 return seq_list_start(&vmap_area_list, *pos);
2646 static void *s_next(struct seq_file *m, void *p, loff_t *pos)
2648 return seq_list_next(p, &vmap_area_list, pos);
2651 static void s_stop(struct seq_file *m, void *p)
2652 __releases(&vmap_area_lock)
2654 spin_unlock(&vmap_area_lock);
2657 static void show_numa_info(struct seq_file *m, struct vm_struct *v)
2659 if (IS_ENABLED(CONFIG_NUMA)) {
2660 unsigned int nr, *counters = m->private;
2665 if (v->flags & VM_UNINITIALIZED)
2667 /* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
2670 memset(counters, 0, nr_node_ids * sizeof(unsigned int));
2672 for (nr = 0; nr < v->nr_pages; nr++)
2673 counters[page_to_nid(v->pages[nr])]++;
2675 for_each_node_state(nr, N_HIGH_MEMORY)
2677 seq_printf(m, " N%u=%u", nr, counters[nr]);
2681 static int s_show(struct seq_file *m, void *p)
2683 struct vmap_area *va;
2684 struct vm_struct *v;
2686 va = list_entry(p, struct vmap_area, list);
2689 * s_show can encounter race with remove_vm_area, !VM_VM_AREA on
2690 * behalf of vmap area is being tear down or vm_map_ram allocation.
2692 if (!(va->flags & VM_VM_AREA)) {
2693 seq_printf(m, "0x%pK-0x%pK %7ld %s\n",
2694 (void *)va->va_start, (void *)va->va_end,
2695 va->va_end - va->va_start,
2696 va->flags & VM_LAZY_FREE ? "unpurged vm_area" : "vm_map_ram");
2703 seq_printf(m, "0x%pK-0x%pK %7ld",
2704 v->addr, v->addr + v->size, v->size);
2707 seq_printf(m, " %pS", v->caller);
2710 seq_printf(m, " pages=%d", v->nr_pages);
2713 seq_printf(m, " phys=%pa", &v->phys_addr);
2715 if (v->flags & VM_IOREMAP)
2716 seq_puts(m, " ioremap");
2718 if (v->flags & VM_ALLOC)
2719 seq_puts(m, " vmalloc");
2721 if (v->flags & VM_MAP)
2722 seq_puts(m, " vmap");
2724 if (v->flags & VM_USERMAP)
2725 seq_puts(m, " user");
2727 if (is_vmalloc_addr(v->pages))
2728 seq_puts(m, " vpages");
2730 show_numa_info(m, v);
2735 static const struct seq_operations vmalloc_op = {
2742 static int __init proc_vmalloc_init(void)
2744 if (IS_ENABLED(CONFIG_NUMA))
2745 proc_create_seq_private("vmallocinfo", 0400, NULL,
2747 nr_node_ids * sizeof(unsigned int), NULL);
2749 proc_create_seq("vmallocinfo", 0400, NULL, &vmalloc_op);
2752 module_init(proc_vmalloc_init);