diff options
author | Nitin Gupta <ngupta@vflare.org> | 2012-01-09 16:52:00 -0600 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-08 17:13:01 -0800 |
commit | b154ff05e1b0d749231a71896c90e38657f8e675 (patch) | |
tree | c22f6c908685d5e2cb7c2bdbda05b0b77b3b6746 /drivers/staging/zram | |
parent | fd1a30dea194002c061503af8425688dcc6f3970 (diff) |
staging: zram: remove xvmalloc
Removes the xvmalloc allocator code from the zram driver
Signed-off-by: Nitin Gupta <ngupta@vflare.org>
Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/zram')
-rw-r--r-- | drivers/staging/zram/xvmalloc.c | 510 | ||||
-rw-r--r-- | drivers/staging/zram/xvmalloc.h | 30 | ||||
-rw-r--r-- | drivers/staging/zram/xvmalloc_int.h | 95 |
3 files changed, 0 insertions, 635 deletions
diff --git a/drivers/staging/zram/xvmalloc.c b/drivers/staging/zram/xvmalloc.c deleted file mode 100644 index 1f9c5082b6d5..000000000000 --- a/drivers/staging/zram/xvmalloc.c +++ /dev/null @@ -1,510 +0,0 @@ -/* - * xvmalloc memory allocator - * - * Copyright (C) 2008, 2009, 2010 Nitin Gupta - * - * This code is released using a dual license strategy: BSD/GPL - * You can choose the licence that better fits your requirements. - * - * Released under the terms of 3-clause BSD License - * Released under the terms of GNU General Public License Version 2.0 - */ - -#ifdef CONFIG_ZRAM_DEBUG -#define DEBUG -#endif - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/bitops.h> -#include <linux/errno.h> -#include <linux/highmem.h> -#include <linux/init.h> -#include <linux/string.h> -#include <linux/slab.h> - -#include "xvmalloc.h" -#include "xvmalloc_int.h" - -static void stat_inc(u64 *value) -{ - *value = *value + 1; -} - -static void stat_dec(u64 *value) -{ - *value = *value - 1; -} - -static int test_flag(struct block_header *block, enum blockflags flag) -{ - return block->prev & BIT(flag); -} - -static void set_flag(struct block_header *block, enum blockflags flag) -{ - block->prev |= BIT(flag); -} - -static void clear_flag(struct block_header *block, enum blockflags flag) -{ - block->prev &= ~BIT(flag); -} - -/* - * Given <page, offset> pair, provide a dereferencable pointer. - * This is called from xv_malloc/xv_free path, so it - * needs to be fast. - */ -static void *get_ptr_atomic(struct page *page, u16 offset, enum km_type type) -{ - unsigned char *base; - - base = kmap_atomic(page, type); - return base + offset; -} - -static void put_ptr_atomic(void *ptr, enum km_type type) -{ - kunmap_atomic(ptr, type); -} - -static u32 get_blockprev(struct block_header *block) -{ - return block->prev & PREV_MASK; -} - -static void set_blockprev(struct block_header *block, u16 new_offset) -{ - block->prev = new_offset | (block->prev & FLAGS_MASK); -} - -static struct block_header *BLOCK_NEXT(struct block_header *block) -{ - return (struct block_header *) - ((char *)block + block->size + XV_ALIGN); -} - -/* - * Get index of free list containing blocks of maximum size - * which is less than or equal to given size. - */ -static u32 get_index_for_insert(u32 size) -{ - if (unlikely(size > XV_MAX_ALLOC_SIZE)) - size = XV_MAX_ALLOC_SIZE; - size &= ~FL_DELTA_MASK; - return (size - XV_MIN_ALLOC_SIZE) >> FL_DELTA_SHIFT; -} - -/* - * Get index of free list having blocks of size greater than - * or equal to requested size. - */ -static u32 get_index(u32 size) -{ - if (unlikely(size < XV_MIN_ALLOC_SIZE)) - size = XV_MIN_ALLOC_SIZE; - size = ALIGN(size, FL_DELTA); - return (size - XV_MIN_ALLOC_SIZE) >> FL_DELTA_SHIFT; -} - -/** - * find_block - find block of at least given size - * @pool: memory pool to search from - * @size: size of block required - * @page: page containing required block - * @offset: offset within the page where block is located. - * - * Searches two level bitmap to locate block of at least - * the given size. If such a block is found, it provides - * <page, offset> to identify this block and returns index - * in freelist where we found this block. - * Otherwise, returns 0 and <page, offset> params are not touched. - */ -static u32 find_block(struct xv_pool *pool, u32 size, - struct page **page, u32 *offset) -{ - ulong flbitmap, slbitmap; - u32 flindex, slindex, slbitstart; - - /* There are no free blocks in this pool */ - if (!pool->flbitmap) - return 0; - - /* Get freelist index correspoding to this size */ - slindex = get_index(size); - slbitmap = pool->slbitmap[slindex / BITS_PER_LONG]; - slbitstart = slindex % BITS_PER_LONG; - - /* - * If freelist is not empty at this index, we found the - * block - head of this list. This is approximate best-fit match. - */ - if (test_bit(slbitstart, &slbitmap)) { - *page = pool->freelist[slindex].page; - *offset = pool->freelist[slindex].offset; - return slindex; - } - - /* - * No best-fit found. Search a bit further in bitmap for a free block. - * Second level bitmap consists of series of 32-bit chunks. Search - * further in the chunk where we expected a best-fit, starting from - * index location found above. - */ - slbitstart++; - slbitmap >>= slbitstart; - - /* Skip this search if we were already at end of this bitmap chunk */ - if ((slbitstart != BITS_PER_LONG) && slbitmap) { - slindex += __ffs(slbitmap) + 1; - *page = pool->freelist[slindex].page; - *offset = pool->freelist[slindex].offset; - return slindex; - } - - /* Now do a full two-level bitmap search to find next nearest fit */ - flindex = slindex / BITS_PER_LONG; - - flbitmap = (pool->flbitmap) >> (flindex + 1); - if (!flbitmap) - return 0; - - flindex += __ffs(flbitmap) + 1; - slbitmap = pool->slbitmap[flindex]; - slindex = (flindex * BITS_PER_LONG) + __ffs(slbitmap); - *page = pool->freelist[slindex].page; - *offset = pool->freelist[slindex].offset; - - return slindex; -} - -/* - * Insert block at <page, offset> in freelist of given pool. - * freelist used depends on block size. - */ -static void insert_block(struct xv_pool *pool, struct page *page, u32 offset, - struct block_header *block) -{ - u32 flindex, slindex; - struct block_header *nextblock; - - slindex = get_index_for_insert(block->size); - flindex = slindex / BITS_PER_LONG; - - block->link.prev_page = NULL; - block->link.prev_offset = 0; - block->link.next_page = pool->freelist[slindex].page; - block->link.next_offset = pool->freelist[slindex].offset; - pool->freelist[slindex].page = page; - pool->freelist[slindex].offset = offset; - - if (block->link.next_page) { - nextblock = get_ptr_atomic(block->link.next_page, - block->link.next_offset, KM_USER1); - nextblock->link.prev_page = page; - nextblock->link.prev_offset = offset; - put_ptr_atomic(nextblock, KM_USER1); - /* If there was a next page then the free bits are set. */ - return; - } - - __set_bit(slindex % BITS_PER_LONG, &pool->slbitmap[flindex]); - __set_bit(flindex, &pool->flbitmap); -} - -/* - * Remove block from freelist. Index 'slindex' identifies the freelist. - */ -static void remove_block(struct xv_pool *pool, struct page *page, u32 offset, - struct block_header *block, u32 slindex) -{ - u32 flindex = slindex / BITS_PER_LONG; - struct block_header *tmpblock; - - if (block->link.prev_page) { - tmpblock = get_ptr_atomic(block->link.prev_page, - block->link.prev_offset, KM_USER1); - tmpblock->link.next_page = block->link.next_page; - tmpblock->link.next_offset = block->link.next_offset; - put_ptr_atomic(tmpblock, KM_USER1); - } - - if (block->link.next_page) { - tmpblock = get_ptr_atomic(block->link.next_page, - block->link.next_offset, KM_USER1); - tmpblock->link.prev_page = block->link.prev_page; - tmpblock->link.prev_offset = block->link.prev_offset; - put_ptr_atomic(tmpblock, KM_USER1); - } - - /* Is this block is at the head of the freelist? */ - if (pool->freelist[slindex].page == page - && pool->freelist[slindex].offset == offset) { - - pool->freelist[slindex].page = block->link.next_page; - pool->freelist[slindex].offset = block->link.next_offset; - - if (pool->freelist[slindex].page) { - struct block_header *tmpblock; - tmpblock = get_ptr_atomic(pool->freelist[slindex].page, - pool->freelist[slindex].offset, - KM_USER1); - tmpblock->link.prev_page = NULL; - tmpblock->link.prev_offset = 0; - put_ptr_atomic(tmpblock, KM_USER1); - } else { - /* This freelist bucket is empty */ - __clear_bit(slindex % BITS_PER_LONG, - &pool->slbitmap[flindex]); - if (!pool->slbitmap[flindex]) - __clear_bit(flindex, &pool->flbitmap); - } - } - - block->link.prev_page = NULL; - block->link.prev_offset = 0; - block->link.next_page = NULL; - block->link.next_offset = 0; -} - -/* - * Allocate a page and add it to freelist of given pool. - */ -static int grow_pool(struct xv_pool *pool, gfp_t flags) -{ - struct page *page; - struct block_header *block; - - page = alloc_page(flags); - if (unlikely(!page)) - return -ENOMEM; - - stat_inc(&pool->total_pages); - - spin_lock(&pool->lock); - block = get_ptr_atomic(page, 0, KM_USER0); - - block->size = PAGE_SIZE - XV_ALIGN; - set_flag(block, BLOCK_FREE); - clear_flag(block, PREV_FREE); - set_blockprev(block, 0); - - insert_block(pool, page, 0, block); - - put_ptr_atomic(block, KM_USER0); - spin_unlock(&pool->lock); - - return 0; -} - -/* - * Create a memory pool. Allocates freelist, bitmaps and other - * per-pool metadata. - */ -struct xv_pool *xv_create_pool(void) -{ - u32 ovhd_size; - struct xv_pool *pool; - - ovhd_size = roundup(sizeof(*pool), PAGE_SIZE); - pool = kzalloc(ovhd_size, GFP_KERNEL); - if (!pool) - return NULL; - - spin_lock_init(&pool->lock); - - return pool; -} -EXPORT_SYMBOL_GPL(xv_create_pool); - -void xv_destroy_pool(struct xv_pool *pool) -{ - kfree(pool); -} -EXPORT_SYMBOL_GPL(xv_destroy_pool); - -/** - * xv_malloc - Allocate block of given size from pool. - * @pool: pool to allocate from - * @size: size of block to allocate - * @page: page no. that holds the object - * @offset: location of object within page - * - * On success, <page, offset> identifies block allocated - * and 0 is returned. On failure, <page, offset> is set to - * 0 and -ENOMEM is returned. - * - * Allocation requests with size > XV_MAX_ALLOC_SIZE will fail. - */ -int xv_malloc(struct xv_pool *pool, u32 size, struct page **page, - u32 *offset, gfp_t flags) -{ - int error; - u32 index, tmpsize, origsize, tmpoffset; - struct block_header *block, *tmpblock; - - *page = NULL; - *offset = 0; - origsize = size; - - if (unlikely(!size || size > XV_MAX_ALLOC_SIZE)) - return -ENOMEM; - - size = ALIGN(size, XV_ALIGN); - - spin_lock(&pool->lock); - - index = find_block(pool, size, page, offset); - - if (!*page) { - spin_unlock(&pool->lock); - if (flags & GFP_NOWAIT) - return -ENOMEM; - error = grow_pool(pool, flags); - if (unlikely(error)) - return error; - - spin_lock(&pool->lock); - index = find_block(pool, size, page, offset); - } - - if (!*page) { - spin_unlock(&pool->lock); - return -ENOMEM; - } - - block = get_ptr_atomic(*page, *offset, KM_USER0); - - remove_block(pool, *page, *offset, block, index); - - /* Split the block if required */ - tmpoffset = *offset + size + XV_ALIGN; - tmpsize = block->size - size; - tmpblock = (struct block_header *)((char *)block + size + XV_ALIGN); - if (tmpsize) { - tmpblock->size = tmpsize - XV_ALIGN; - set_flag(tmpblock, BLOCK_FREE); - clear_flag(tmpblock, PREV_FREE); - - set_blockprev(tmpblock, *offset); - if (tmpblock->size >= XV_MIN_ALLOC_SIZE) - insert_block(pool, *page, tmpoffset, tmpblock); - - if (tmpoffset + XV_ALIGN + tmpblock->size != PAGE_SIZE) { - tmpblock = BLOCK_NEXT(tmpblock); - set_blockprev(tmpblock, tmpoffset); - } - } else { - /* This block is exact fit */ - if (tmpoffset != PAGE_SIZE) - clear_flag(tmpblock, PREV_FREE); - } - - block->size = origsize; - clear_flag(block, BLOCK_FREE); - - put_ptr_atomic(block, KM_USER0); - spin_unlock(&pool->lock); - - *offset += XV_ALIGN; - - return 0; -} -EXPORT_SYMBOL_GPL(xv_malloc); - -/* - * Free block identified with <page, offset> - */ -void xv_free(struct xv_pool *pool, struct page *page, u32 offset) -{ - void *page_start; - struct block_header *block, *tmpblock; - - offset -= XV_ALIGN; - - spin_lock(&pool->lock); - - page_start = get_ptr_atomic(page, 0, KM_USER0); - block = (struct block_header *)((char *)page_start + offset); - - /* Catch double free bugs */ - BUG_ON(test_flag(block, BLOCK_FREE)); - - block->size = ALIGN(block->size, XV_ALIGN); - - tmpblock = BLOCK_NEXT(block); - if (offset + block->size + XV_ALIGN == PAGE_SIZE) - tmpblock = NULL; - - /* Merge next block if its free */ - if (tmpblock && test_flag(tmpblock, BLOCK_FREE)) { - /* - * Blocks smaller than XV_MIN_ALLOC_SIZE - * are not inserted in any free list. - */ - if (tmpblock->size >= XV_MIN_ALLOC_SIZE) { - remove_block(pool, page, - offset + block->size + XV_ALIGN, tmpblock, - get_index_for_insert(tmpblock->size)); - } - block->size += tmpblock->size + XV_ALIGN; - } - - /* Merge previous block if its free */ - if (test_flag(block, PREV_FREE)) { - tmpblock = (struct block_header *)((char *)(page_start) + - get_blockprev(block)); - offset = offset - tmpblock->size - XV_ALIGN; - - if (tmpblock->size >= XV_MIN_ALLOC_SIZE) - remove_block(pool, page, offset, tmpblock, - get_index_for_insert(tmpblock->size)); - - tmpblock->size += block->size + XV_ALIGN; - block = tmpblock; - } - - /* No used objects in this page. Free it. */ - if (block->size == PAGE_SIZE - XV_ALIGN) { - put_ptr_atomic(page_start, KM_USER0); - spin_unlock(&pool->lock); - - __free_page(page); - stat_dec(&pool->total_pages); - return; - } - - set_flag(block, BLOCK_FREE); - if (block->size >= XV_MIN_ALLOC_SIZE) - insert_block(pool, page, offset, block); - - if (offset + block->size + XV_ALIGN != PAGE_SIZE) { - tmpblock = BLOCK_NEXT(block); - set_flag(tmpblock, PREV_FREE); - set_blockprev(tmpblock, offset); - } - - put_ptr_atomic(page_start, KM_USER0); - spin_unlock(&pool->lock); -} -EXPORT_SYMBOL_GPL(xv_free); - -u32 xv_get_object_size(void *obj) -{ - struct block_header *blk; - - blk = (struct block_header *)((char *)(obj) - XV_ALIGN); - return blk->size; -} -EXPORT_SYMBOL_GPL(xv_get_object_size); - -/* - * Returns total memory used by allocator (userdata + metadata) - */ -u64 xv_get_total_size_bytes(struct xv_pool *pool) -{ - return pool->total_pages << PAGE_SHIFT; -} -EXPORT_SYMBOL_GPL(xv_get_total_size_bytes); diff --git a/drivers/staging/zram/xvmalloc.h b/drivers/staging/zram/xvmalloc.h deleted file mode 100644 index 5b1a81aa5faf..000000000000 --- a/drivers/staging/zram/xvmalloc.h +++ /dev/null @@ -1,30 +0,0 @@ -/* - * xvmalloc memory allocator - * - * Copyright (C) 2008, 2009, 2010 Nitin Gupta - * - * This code is released using a dual license strategy: BSD/GPL - * You can choose the licence that better fits your requirements. - * - * Released under the terms of 3-clause BSD License - * Released under the terms of GNU General Public License Version 2.0 - */ - -#ifndef _XV_MALLOC_H_ -#define _XV_MALLOC_H_ - -#include <linux/types.h> - -struct xv_pool; - -struct xv_pool *xv_create_pool(void); -void xv_destroy_pool(struct xv_pool *pool); - -int xv_malloc(struct xv_pool *pool, u32 size, struct page **page, - u32 *offset, gfp_t flags); -void xv_free(struct xv_pool *pool, struct page *page, u32 offset); - -u32 xv_get_object_size(void *obj); -u64 xv_get_total_size_bytes(struct xv_pool *pool); - -#endif diff --git a/drivers/staging/zram/xvmalloc_int.h b/drivers/staging/zram/xvmalloc_int.h deleted file mode 100644 index b5f1f7febcf6..000000000000 --- a/drivers/staging/zram/xvmalloc_int.h +++ /dev/null @@ -1,95 +0,0 @@ -/* - * xvmalloc memory allocator - * - * Copyright (C) 2008, 2009, 2010 Nitin Gupta - * - * This code is released using a dual license strategy: BSD/GPL - * You can choose the licence that better fits your requirements. - * - * Released under the terms of 3-clause BSD License - * Released under the terms of GNU General Public License Version 2.0 - */ - -#ifndef _XV_MALLOC_INT_H_ -#define _XV_MALLOC_INT_H_ - -#include <linux/kernel.h> -#include <linux/types.h> - -/* User configurable params */ - -/* Must be power of two */ -#ifdef CONFIG_64BIT -#define XV_ALIGN_SHIFT 3 -#else -#define XV_ALIGN_SHIFT 2 -#endif -#define XV_ALIGN (1 << XV_ALIGN_SHIFT) -#define XV_ALIGN_MASK (XV_ALIGN - 1) - -/* This must be greater than sizeof(link_free) */ -#define XV_MIN_ALLOC_SIZE 32 -#define XV_MAX_ALLOC_SIZE (PAGE_SIZE - XV_ALIGN) - -/* - * Free lists are separated by FL_DELTA bytes - * This value is 3 for 4k pages and 4 for 64k pages, for any - * other page size, a conservative (PAGE_SHIFT - 9) is used. - */ -#if PAGE_SHIFT == 16 -#define FL_DELTA_SHIFT 4 -#else -#define FL_DELTA_SHIFT (PAGE_SHIFT - 9) -#endif -#define FL_DELTA (1 << FL_DELTA_SHIFT) -#define FL_DELTA_MASK (FL_DELTA - 1) -#define NUM_FREE_LISTS ((XV_MAX_ALLOC_SIZE - XV_MIN_ALLOC_SIZE) \ - / FL_DELTA + 1) - -#define MAX_FLI DIV_ROUND_UP(NUM_FREE_LISTS, BITS_PER_LONG) - -/* End of user params */ - -enum blockflags { - BLOCK_FREE, - PREV_FREE, - __NR_BLOCKFLAGS, -}; - -#define FLAGS_MASK XV_ALIGN_MASK -#define PREV_MASK (~FLAGS_MASK) - -struct freelist_entry { - struct page *page; - u16 offset; - u16 pad; -}; - -struct link_free { - struct page *prev_page; - struct page *next_page; - u16 prev_offset; - u16 next_offset; -}; - -struct block_header { - union { - /* This common header must be XV_ALIGN bytes */ - u8 common[XV_ALIGN]; - struct { - u16 size; - u16 prev; - }; - }; - struct link_free link; -}; - -struct xv_pool { - ulong flbitmap; - ulong slbitmap[MAX_FLI]; - u64 total_pages; /* stats */ - struct freelist_entry freelist[NUM_FREE_LISTS]; - spinlock_t lock; -}; - -#endif |