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
12 #include <linux/module.h>
13 #include <linux/highmem.h>
14 #include <linux/slab.h>
15 #include <linux/spinlock.h>
16 #include <linux/interrupt.h>
18 #include <linux/vmalloc.h>
20 #include <asm/uaccess.h>
21 #include <asm/tlbflush.h>
24 DEFINE_RWLOCK(vmlist_lock
);
25 struct vm_struct
*vmlist
;
27 static void *__vmalloc_node(unsigned long size
, gfp_t gfp_mask
, pgprot_t prot
,
30 static void vunmap_pte_range(pmd_t
*pmd
, unsigned long addr
, unsigned long end
)
34 pte
= pte_offset_kernel(pmd
, addr
);
36 pte_t ptent
= ptep_get_and_clear(&init_mm
, addr
, pte
);
37 WARN_ON(!pte_none(ptent
) && !pte_present(ptent
));
38 } while (pte
++, addr
+= PAGE_SIZE
, addr
!= end
);
41 static inline void vunmap_pmd_range(pud_t
*pud
, unsigned long addr
,
47 pmd
= pmd_offset(pud
, addr
);
49 next
= pmd_addr_end(addr
, end
);
50 if (pmd_none_or_clear_bad(pmd
))
52 vunmap_pte_range(pmd
, addr
, next
);
53 } while (pmd
++, addr
= next
, addr
!= end
);
56 static inline void vunmap_pud_range(pgd_t
*pgd
, unsigned long addr
,
62 pud
= pud_offset(pgd
, addr
);
64 next
= pud_addr_end(addr
, end
);
65 if (pud_none_or_clear_bad(pud
))
67 vunmap_pmd_range(pud
, addr
, next
);
68 } while (pud
++, addr
= next
, addr
!= end
);
71 void unmap_kernel_range(unsigned long addr
, unsigned long size
)
75 unsigned long start
= addr
;
76 unsigned long end
= addr
+ size
;
79 pgd
= pgd_offset_k(addr
);
80 flush_cache_vunmap(addr
, end
);
82 next
= pgd_addr_end(addr
, end
);
83 if (pgd_none_or_clear_bad(pgd
))
85 vunmap_pud_range(pgd
, addr
, next
);
86 } while (pgd
++, addr
= next
, addr
!= end
);
87 flush_tlb_kernel_range(start
, end
);
90 static void unmap_vm_area(struct vm_struct
*area
)
92 unmap_kernel_range((unsigned long)area
->addr
, area
->size
);
95 static int vmap_pte_range(pmd_t
*pmd
, unsigned long addr
,
96 unsigned long end
, pgprot_t prot
, struct page
***pages
)
100 pte
= pte_alloc_kernel(pmd
, addr
);
104 struct page
*page
= **pages
;
105 WARN_ON(!pte_none(*pte
));
108 set_pte_at(&init_mm
, addr
, pte
, mk_pte(page
, prot
));
110 } while (pte
++, addr
+= PAGE_SIZE
, addr
!= end
);
114 static inline int vmap_pmd_range(pud_t
*pud
, unsigned long addr
,
115 unsigned long end
, pgprot_t prot
, struct page
***pages
)
120 pmd
= pmd_alloc(&init_mm
, pud
, addr
);
124 next
= pmd_addr_end(addr
, end
);
125 if (vmap_pte_range(pmd
, addr
, next
, prot
, pages
))
127 } while (pmd
++, addr
= next
, addr
!= end
);
131 static inline int vmap_pud_range(pgd_t
*pgd
, unsigned long addr
,
132 unsigned long end
, pgprot_t prot
, struct page
***pages
)
137 pud
= pud_alloc(&init_mm
, pgd
, addr
);
141 next
= pud_addr_end(addr
, end
);
142 if (vmap_pmd_range(pud
, addr
, next
, prot
, pages
))
144 } while (pud
++, addr
= next
, addr
!= end
);
148 int map_vm_area(struct vm_struct
*area
, pgprot_t prot
, struct page
***pages
)
152 unsigned long addr
= (unsigned long) area
->addr
;
153 unsigned long end
= addr
+ area
->size
- PAGE_SIZE
;
157 pgd
= pgd_offset_k(addr
);
159 next
= pgd_addr_end(addr
, end
);
160 err
= vmap_pud_range(pgd
, addr
, next
, prot
, pages
);
163 } while (pgd
++, addr
= next
, addr
!= end
);
164 flush_cache_vmap((unsigned long) area
->addr
, end
);
168 static struct vm_struct
*__get_vm_area_node(unsigned long size
, unsigned long flags
,
169 unsigned long start
, unsigned long end
,
170 int node
, gfp_t gfp_mask
)
172 struct vm_struct
**p
, *tmp
, *area
;
173 unsigned long align
= 1;
176 BUG_ON(in_interrupt());
177 if (flags
& VM_IOREMAP
) {
180 if (bit
> IOREMAP_MAX_ORDER
)
181 bit
= IOREMAP_MAX_ORDER
;
182 else if (bit
< PAGE_SHIFT
)
187 addr
= ALIGN(start
, align
);
188 size
= PAGE_ALIGN(size
);
192 area
= kmalloc_node(sizeof(*area
), gfp_mask
& GFP_LEVEL_MASK
, node
);
197 * We always allocate a guard page.
201 write_lock(&vmlist_lock
);
202 for (p
= &vmlist
; (tmp
= *p
) != NULL
;p
= &tmp
->next
) {
203 if ((unsigned long)tmp
->addr
< addr
) {
204 if((unsigned long)tmp
->addr
+ tmp
->size
>= addr
)
205 addr
= ALIGN(tmp
->size
+
206 (unsigned long)tmp
->addr
, align
);
209 if ((size
+ addr
) < addr
)
211 if (size
+ addr
<= (unsigned long)tmp
->addr
)
213 addr
= ALIGN(tmp
->size
+ (unsigned long)tmp
->addr
, align
);
214 if (addr
> end
- size
)
223 area
->addr
= (void *)addr
;
228 write_unlock(&vmlist_lock
);
233 write_unlock(&vmlist_lock
);
235 if (printk_ratelimit())
236 printk(KERN_WARNING
"allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.\n");
240 struct vm_struct
*__get_vm_area(unsigned long size
, unsigned long flags
,
241 unsigned long start
, unsigned long end
)
243 return __get_vm_area_node(size
, flags
, start
, end
, -1, GFP_KERNEL
);
247 * get_vm_area - reserve a contingous kernel virtual area
248 * @size: size of the area
249 * @flags: %VM_IOREMAP for I/O mappings or VM_ALLOC
251 * Search an area of @size in the kernel virtual mapping area,
252 * and reserved it for out purposes. Returns the area descriptor
253 * on success or %NULL on failure.
255 struct vm_struct
*get_vm_area(unsigned long size
, unsigned long flags
)
257 return __get_vm_area(size
, flags
, VMALLOC_START
, VMALLOC_END
);
260 struct vm_struct
*get_vm_area_node(unsigned long size
, unsigned long flags
,
261 int node
, gfp_t gfp_mask
)
263 return __get_vm_area_node(size
, flags
, VMALLOC_START
, VMALLOC_END
, node
,
267 /* Caller must hold vmlist_lock */
268 static struct vm_struct
*__find_vm_area(void *addr
)
270 struct vm_struct
*tmp
;
272 for (tmp
= vmlist
; tmp
!= NULL
; tmp
= tmp
->next
) {
273 if (tmp
->addr
== addr
)
280 /* Caller must hold vmlist_lock */
281 static struct vm_struct
*__remove_vm_area(void *addr
)
283 struct vm_struct
**p
, *tmp
;
285 for (p
= &vmlist
; (tmp
= *p
) != NULL
;p
= &tmp
->next
) {
286 if (tmp
->addr
== addr
)
296 * Remove the guard page.
298 tmp
->size
-= PAGE_SIZE
;
303 * remove_vm_area - find and remove a contingous kernel virtual area
304 * @addr: base address
306 * Search for the kernel VM area starting at @addr, and remove it.
307 * This function returns the found VM area, but using it is NOT safe
308 * on SMP machines, except for its size or flags.
310 struct vm_struct
*remove_vm_area(void *addr
)
313 write_lock(&vmlist_lock
);
314 v
= __remove_vm_area(addr
);
315 write_unlock(&vmlist_lock
);
319 static void __vunmap(void *addr
, int deallocate_pages
)
321 struct vm_struct
*area
;
326 if ((PAGE_SIZE
-1) & (unsigned long)addr
) {
327 printk(KERN_ERR
"Trying to vfree() bad address (%p)\n", addr
);
332 area
= remove_vm_area(addr
);
333 if (unlikely(!area
)) {
334 printk(KERN_ERR
"Trying to vfree() nonexistent vm area (%p)\n",
340 debug_check_no_locks_freed(addr
, area
->size
);
342 if (deallocate_pages
) {
345 for (i
= 0; i
< area
->nr_pages
; i
++) {
346 BUG_ON(!area
->pages
[i
]);
347 __free_page(area
->pages
[i
]);
350 if (area
->flags
& VM_VPAGES
)
361 * vfree - release memory allocated by vmalloc()
362 * @addr: memory base address
364 * Free the virtually contiguous memory area starting at @addr, as
365 * obtained from vmalloc(), vmalloc_32() or __vmalloc(). If @addr is
366 * NULL, no operation is performed.
368 * Must not be called in interrupt context.
370 void vfree(void *addr
)
372 BUG_ON(in_interrupt());
375 EXPORT_SYMBOL(vfree
);
378 * vunmap - release virtual mapping obtained by vmap()
379 * @addr: memory base address
381 * Free the virtually contiguous memory area starting at @addr,
382 * which was created from the page array passed to vmap().
384 * Must not be called in interrupt context.
386 void vunmap(void *addr
)
388 BUG_ON(in_interrupt());
391 EXPORT_SYMBOL(vunmap
);
394 * vmap - map an array of pages into virtually contiguous space
395 * @pages: array of page pointers
396 * @count: number of pages to map
397 * @flags: vm_area->flags
398 * @prot: page protection for the mapping
400 * Maps @count pages from @pages into contiguous kernel virtual
403 void *vmap(struct page
**pages
, unsigned int count
,
404 unsigned long flags
, pgprot_t prot
)
406 struct vm_struct
*area
;
408 if (count
> num_physpages
)
411 area
= get_vm_area((count
<< PAGE_SHIFT
), flags
);
414 if (map_vm_area(area
, prot
, &pages
)) {
423 void *__vmalloc_area_node(struct vm_struct
*area
, gfp_t gfp_mask
,
424 pgprot_t prot
, int node
)
427 unsigned int nr_pages
, array_size
, i
;
429 nr_pages
= (area
->size
- PAGE_SIZE
) >> PAGE_SHIFT
;
430 array_size
= (nr_pages
* sizeof(struct page
*));
432 area
->nr_pages
= nr_pages
;
433 /* Please note that the recursion is strictly bounded. */
434 if (array_size
> PAGE_SIZE
) {
435 pages
= __vmalloc_node(array_size
, gfp_mask
, PAGE_KERNEL
, node
);
436 area
->flags
|= VM_VPAGES
;
438 pages
= kmalloc_node(array_size
,
439 (gfp_mask
& GFP_LEVEL_MASK
),
444 remove_vm_area(area
->addr
);
448 memset(area
->pages
, 0, array_size
);
450 for (i
= 0; i
< area
->nr_pages
; i
++) {
452 area
->pages
[i
] = alloc_page(gfp_mask
);
454 area
->pages
[i
] = alloc_pages_node(node
, gfp_mask
, 0);
455 if (unlikely(!area
->pages
[i
])) {
456 /* Successfully allocated i pages, free them in __vunmap() */
462 if (map_vm_area(area
, prot
, &pages
))
471 void *__vmalloc_area(struct vm_struct
*area
, gfp_t gfp_mask
, pgprot_t prot
)
473 return __vmalloc_area_node(area
, gfp_mask
, prot
, -1);
477 * __vmalloc_node - allocate virtually contiguous memory
478 * @size: allocation size
479 * @gfp_mask: flags for the page level allocator
480 * @prot: protection mask for the allocated pages
481 * @node: node to use for allocation or -1
483 * Allocate enough pages to cover @size from the page level
484 * allocator with @gfp_mask flags. Map them into contiguous
485 * kernel virtual space, using a pagetable protection of @prot.
487 static void *__vmalloc_node(unsigned long size
, gfp_t gfp_mask
, pgprot_t prot
,
490 struct vm_struct
*area
;
492 size
= PAGE_ALIGN(size
);
493 if (!size
|| (size
>> PAGE_SHIFT
) > num_physpages
)
496 area
= get_vm_area_node(size
, VM_ALLOC
, node
, gfp_mask
);
500 return __vmalloc_area_node(area
, gfp_mask
, prot
, node
);
503 void *__vmalloc(unsigned long size
, gfp_t gfp_mask
, pgprot_t prot
)
505 return __vmalloc_node(size
, gfp_mask
, prot
, -1);
507 EXPORT_SYMBOL(__vmalloc
);
510 * vmalloc - allocate virtually contiguous memory
511 * @size: allocation size
512 * Allocate enough pages to cover @size from the page level
513 * allocator and map them into contiguous kernel virtual space.
515 * For tight control over page level allocator and protection flags
516 * use __vmalloc() instead.
518 void *vmalloc(unsigned long size
)
520 return __vmalloc(size
, GFP_KERNEL
| __GFP_HIGHMEM
, PAGE_KERNEL
);
522 EXPORT_SYMBOL(vmalloc
);
525 * vmalloc_user - allocate zeroed virtually contiguous memory for userspace
526 * @size: allocation size
528 * The resulting memory area is zeroed so it can be mapped to userspace
529 * without leaking data.
531 void *vmalloc_user(unsigned long size
)
533 struct vm_struct
*area
;
536 ret
= __vmalloc(size
, GFP_KERNEL
| __GFP_HIGHMEM
| __GFP_ZERO
, PAGE_KERNEL
);
538 write_lock(&vmlist_lock
);
539 area
= __find_vm_area(ret
);
540 area
->flags
|= VM_USERMAP
;
541 write_unlock(&vmlist_lock
);
545 EXPORT_SYMBOL(vmalloc_user
);
548 * vmalloc_node - allocate memory on a specific node
549 * @size: allocation size
552 * Allocate enough pages to cover @size from the page level
553 * allocator and map them into contiguous kernel virtual space.
555 * For tight control over page level allocator and protection flags
556 * use __vmalloc() instead.
558 void *vmalloc_node(unsigned long size
, int node
)
560 return __vmalloc_node(size
, GFP_KERNEL
| __GFP_HIGHMEM
, PAGE_KERNEL
, node
);
562 EXPORT_SYMBOL(vmalloc_node
);
564 #ifndef PAGE_KERNEL_EXEC
565 # define PAGE_KERNEL_EXEC PAGE_KERNEL
569 * vmalloc_exec - allocate virtually contiguous, executable memory
570 * @size: allocation size
572 * Kernel-internal function to allocate enough pages to cover @size
573 * the page level allocator and map them into contiguous and
574 * executable kernel virtual space.
576 * For tight control over page level allocator and protection flags
577 * use __vmalloc() instead.
580 void *vmalloc_exec(unsigned long size
)
582 return __vmalloc(size
, GFP_KERNEL
| __GFP_HIGHMEM
, PAGE_KERNEL_EXEC
);
585 #if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)
586 #define GFP_VMALLOC32 GFP_DMA32
587 #elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA)
588 #define GFP_VMALLOC32 GFP_DMA
590 #define GFP_VMALLOC32 GFP_KERNEL
594 * vmalloc_32 - allocate virtually contiguous memory (32bit addressable)
595 * @size: allocation size
597 * Allocate enough 32bit PA addressable pages to cover @size from the
598 * page level allocator and map them into contiguous kernel virtual space.
600 void *vmalloc_32(unsigned long size
)
602 return __vmalloc(size
, GFP_VMALLOC32
, PAGE_KERNEL
);
604 EXPORT_SYMBOL(vmalloc_32
);
607 * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory
608 * @size: allocation size
610 * The resulting memory area is 32bit addressable and zeroed so it can be
611 * mapped to userspace without leaking data.
613 void *vmalloc_32_user(unsigned long size
)
615 struct vm_struct
*area
;
618 ret
= __vmalloc(size
, GFP_VMALLOC32
| __GFP_ZERO
, PAGE_KERNEL
);
620 write_lock(&vmlist_lock
);
621 area
= __find_vm_area(ret
);
622 area
->flags
|= VM_USERMAP
;
623 write_unlock(&vmlist_lock
);
627 EXPORT_SYMBOL(vmalloc_32_user
);
629 long vread(char *buf
, char *addr
, unsigned long count
)
631 struct vm_struct
*tmp
;
632 char *vaddr
, *buf_start
= buf
;
635 /* Don't allow overflow */
636 if ((unsigned long) addr
+ count
< count
)
637 count
= -(unsigned long) addr
;
639 read_lock(&vmlist_lock
);
640 for (tmp
= vmlist
; tmp
; tmp
= tmp
->next
) {
641 vaddr
= (char *) tmp
->addr
;
642 if (addr
>= vaddr
+ tmp
->size
- PAGE_SIZE
)
644 while (addr
< vaddr
) {
652 n
= vaddr
+ tmp
->size
- PAGE_SIZE
- addr
;
663 read_unlock(&vmlist_lock
);
664 return buf
- buf_start
;
667 long vwrite(char *buf
, char *addr
, unsigned long count
)
669 struct vm_struct
*tmp
;
670 char *vaddr
, *buf_start
= buf
;
673 /* Don't allow overflow */
674 if ((unsigned long) addr
+ count
< count
)
675 count
= -(unsigned long) addr
;
677 read_lock(&vmlist_lock
);
678 for (tmp
= vmlist
; tmp
; tmp
= tmp
->next
) {
679 vaddr
= (char *) tmp
->addr
;
680 if (addr
>= vaddr
+ tmp
->size
- PAGE_SIZE
)
682 while (addr
< vaddr
) {
689 n
= vaddr
+ tmp
->size
- PAGE_SIZE
- addr
;
700 read_unlock(&vmlist_lock
);
701 return buf
- buf_start
;
705 * remap_vmalloc_range - map vmalloc pages to userspace
706 * @vma: vma to cover (map full range of vma)
707 * @addr: vmalloc memory
708 * @pgoff: number of pages into addr before first page to map
709 * @returns: 0 for success, -Exxx on failure
711 * This function checks that addr is a valid vmalloc'ed area, and
712 * that it is big enough to cover the vma. Will return failure if
713 * that criteria isn't met.
715 * Similar to remap_pfn_range() (see mm/memory.c)
717 int remap_vmalloc_range(struct vm_area_struct
*vma
, void *addr
,
720 struct vm_struct
*area
;
721 unsigned long uaddr
= vma
->vm_start
;
722 unsigned long usize
= vma
->vm_end
- vma
->vm_start
;
725 if ((PAGE_SIZE
-1) & (unsigned long)addr
)
728 read_lock(&vmlist_lock
);
729 area
= __find_vm_area(addr
);
731 goto out_einval_locked
;
733 if (!(area
->flags
& VM_USERMAP
))
734 goto out_einval_locked
;
736 if (usize
+ (pgoff
<< PAGE_SHIFT
) > area
->size
- PAGE_SIZE
)
737 goto out_einval_locked
;
738 read_unlock(&vmlist_lock
);
740 addr
+= pgoff
<< PAGE_SHIFT
;
742 struct page
*page
= vmalloc_to_page(addr
);
743 ret
= vm_insert_page(vma
, uaddr
, page
);
752 /* Prevent "things" like memory migration? VM_flags need a cleanup... */
753 vma
->vm_flags
|= VM_RESERVED
;
758 read_unlock(&vmlist_lock
);
761 EXPORT_SYMBOL(remap_vmalloc_range
);
764 * Implement a stub for vmalloc_sync_all() if the architecture chose not to
767 void __attribute__((weak
)) vmalloc_sync_all(void)
This page took 0.067665 seconds and 6 git commands to generate.