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mm/dmapool.c
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/* * DMA Pool allocator * * Copyright 2001 David Brownell * Copyright 2007 Intel Corporation * Author: Matthew Wilcox <willy@linux.intel.com> * * This software may be redistributed and/or modified under the terms of * the GNU General Public License ("GPL") version 2 as published by the * Free Software Foundation. * * This allocator returns small blocks of a given size which are DMA-able by * the given device. It uses the dma_alloc_coherent page allocator to get * new pages, then splits them up into blocks of the required size. * Many older drivers still have their own code to do this. * * The current design of this allocator is fairly simple. The pool is * represented by the 'struct dma_pool' which keeps a doubly-linked list of * allocated pages. Each page in the page_list is split into blocks of at |
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* least 'size' bytes. Free blocks are tracked in an unsorted singly-linked * list of free blocks within the page. Used blocks aren't tracked, but we * keep a count of how many are currently allocated from each page. |
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*/ |
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#include <linux/device.h> |
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#include <linux/dma-mapping.h> #include <linux/dmapool.h> |
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#include <linux/kernel.h> #include <linux/list.h> |
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#include <linux/export.h> |
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#include <linux/mutex.h> |
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#include <linux/poison.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/stat.h> |
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#include <linux/spinlock.h> #include <linux/string.h> #include <linux/types.h> #include <linux/wait.h> |
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|
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#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB_DEBUG_ON) #define DMAPOOL_DEBUG 1 #endif |
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struct dma_pool { /* the pool */ struct list_head page_list; spinlock_t lock; |
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size_t size; struct device *dev; size_t allocation; |
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size_t boundary; |
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char name[32]; |
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struct list_head pools; |
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}; |
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struct dma_page { /* cacheable header for 'allocation' bytes */ struct list_head page_list; void *vaddr; dma_addr_t dma; |
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unsigned int in_use; unsigned int offset; |
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}; |
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static DEFINE_MUTEX(pools_lock); |
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static ssize_t |
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show_pools(struct device *dev, struct device_attribute *attr, char *buf) |
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{ unsigned temp; unsigned size; char *next; struct dma_page *page; struct dma_pool *pool; next = buf; size = PAGE_SIZE; temp = scnprintf(next, size, "poolinfo - 0.1 "); size -= temp; next += temp; |
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mutex_lock(&pools_lock); |
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list_for_each_entry(pool, &dev->dma_pools, pools) { unsigned pages = 0; unsigned blocks = 0; |
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spin_lock_irq(&pool->lock); |
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list_for_each_entry(page, &pool->page_list, page_list) { pages++; blocks += page->in_use; } |
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spin_unlock_irq(&pool->lock); |
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/* per-pool info, no real statistics yet */ temp = scnprintf(next, size, "%-16s %4u %4Zu %4Zu %2u ", |
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pool->name, blocks, pages * (pool->allocation / pool->size), |
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pool->size, pages); |
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size -= temp; next += temp; } |
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mutex_unlock(&pools_lock); |
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return PAGE_SIZE - size; } |
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static DEVICE_ATTR(pools, S_IRUGO, show_pools, NULL); |
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/** * dma_pool_create - Creates a pool of consistent memory blocks, for dma. * @name: name of pool, for diagnostics * @dev: device that will be doing the DMA * @size: size of the blocks in this pool. * @align: alignment requirement for blocks; must be a power of two |
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* @boundary: returned blocks won't cross this power of two boundary |
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* Context: !in_interrupt() * * Returns a dma allocation pool with the requested characteristics, or * null if one can't be created. Given one of these pools, dma_pool_alloc() * may be used to allocate memory. Such memory will all have "consistent" * DMA mappings, accessible by the device and its driver without using * cache flushing primitives. The actual size of blocks allocated may be * larger than requested because of alignment. * |
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* If @boundary is nonzero, objects returned from dma_pool_alloc() won't |
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* cross that size boundary. This is useful for devices which have * addressing restrictions on individual DMA transfers, such as not crossing * boundaries of 4KBytes. */ |
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struct dma_pool *dma_pool_create(const char *name, struct device *dev, |
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size_t size, size_t align, size_t boundary) |
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{ |
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struct dma_pool *retval; |
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size_t allocation; |
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|
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if (align == 0) { |
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align = 1; |
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} else if (align & (align - 1)) { |
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return NULL; |
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} |
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if (size == 0) { |
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return NULL; |
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} else if (size < 4) { size = 4; } |
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if ((size % align) != 0) size = ALIGN(size, align); |
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allocation = max_t(size_t, size, PAGE_SIZE); if (!boundary) { boundary = allocation; } else if ((boundary < size) || (boundary & (boundary - 1))) { |
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return NULL; |
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} |
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|
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retval = kmalloc_node(sizeof(*retval), GFP_KERNEL, dev_to_node(dev)); if (!retval) |
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return retval; |
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strlcpy(retval->name, name, sizeof(retval->name)); |
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retval->dev = dev; |
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INIT_LIST_HEAD(&retval->page_list); spin_lock_init(&retval->lock); |
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retval->size = size; |
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retval->boundary = boundary; |
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retval->allocation = allocation; |
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if (dev) { |
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int ret; |
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mutex_lock(&pools_lock); |
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if (list_empty(&dev->dma_pools)) ret = device_create_file(dev, &dev_attr_pools); |
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else ret = 0; |
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/* note: not currently insisting "name" be unique */ |
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if (!ret) |
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list_add(&retval->pools, &dev->dma_pools); |
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else { kfree(retval); retval = NULL; } |
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mutex_unlock(&pools_lock); |
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} else |
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INIT_LIST_HEAD(&retval->pools); |
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return retval; } |
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EXPORT_SYMBOL(dma_pool_create); |
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|
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static void pool_initialise_page(struct dma_pool *pool, struct dma_page *page) { unsigned int offset = 0; |
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unsigned int next_boundary = pool->boundary; |
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do { unsigned int next = offset + pool->size; |
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if (unlikely((next + pool->size) >= next_boundary)) { next = next_boundary; next_boundary += pool->boundary; } |
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*(int *)(page->vaddr + offset) = next; offset = next; } while (offset < pool->allocation); } |
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static struct dma_page *pool_alloc_page(struct dma_pool *pool, gfp_t mem_flags) |
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{ |
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struct dma_page *page; |
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|
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page = kmalloc(sizeof(*page), mem_flags); |
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if (!page) return NULL; |
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page->vaddr = dma_alloc_coherent(pool->dev, pool->allocation, |
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&page->dma, mem_flags); |
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if (page->vaddr) { |
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#ifdef DMAPOOL_DEBUG |
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memset(page->vaddr, POOL_POISON_FREED, pool->allocation); |
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#endif |
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pool_initialise_page(pool, page); |
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page->in_use = 0; |
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page->offset = 0; |
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} else { |
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kfree(page); |
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page = NULL; } return page; } |
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static inline int is_page_busy(struct dma_page *page) |
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{ |
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return page->in_use != 0; |
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} |
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static void pool_free_page(struct dma_pool *pool, struct dma_page *page) |
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{ |
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dma_addr_t dma = page->dma; |
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|
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#ifdef DMAPOOL_DEBUG |
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memset(page->vaddr, POOL_POISON_FREED, pool->allocation); |
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#endif |
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dma_free_coherent(pool->dev, pool->allocation, page->vaddr, dma); list_del(&page->page_list); kfree(page); |
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} |
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/** * dma_pool_destroy - destroys a pool of dma memory blocks. * @pool: dma pool that will be destroyed * Context: !in_interrupt() * * Caller guarantees that no more memory from the pool is in use, * and that nothing will try to use the pool after this call. */ |
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void dma_pool_destroy(struct dma_pool *pool) |
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{ |
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mutex_lock(&pools_lock); |
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list_del(&pool->pools); if (pool->dev && list_empty(&pool->dev->dma_pools)) device_remove_file(pool->dev, &dev_attr_pools); |
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mutex_unlock(&pools_lock); |
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|
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while (!list_empty(&pool->page_list)) { struct dma_page *page; page = list_entry(pool->page_list.next, struct dma_page, page_list); |
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if (is_page_busy(page)) { |
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if (pool->dev) |
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dev_err(pool->dev, "dma_pool_destroy %s, %p busy ", |
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pool->name, page->vaddr); else |
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printk(KERN_ERR "dma_pool_destroy %s, %p busy ", pool->name, page->vaddr); |
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/* leak the still-in-use consistent memory */ |
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list_del(&page->page_list); kfree(page); |
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} else |
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pool_free_page(pool, page); |
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} |
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kfree(pool); |
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} |
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EXPORT_SYMBOL(dma_pool_destroy); |
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/** * dma_pool_alloc - get a block of consistent memory * @pool: dma pool that will produce the block * @mem_flags: GFP_* bitmask * @handle: pointer to dma address of block * * This returns the kernel virtual address of a currently unused block, * and reports its dma address through the handle. |
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* If such a memory block can't be allocated, %NULL is returned. |
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*/ |
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void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle) |
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{ |
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unsigned long flags; struct dma_page *page; |
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size_t offset; void *retval; |
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might_sleep_if(mem_flags & __GFP_WAIT); |
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spin_lock_irqsave(&pool->lock, flags); |
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list_for_each_entry(page, &pool->page_list, page_list) { |
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if (page->offset < pool->allocation) goto ready; |
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} |
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|
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/* pool_alloc_page() might sleep, so temporarily drop &pool->lock */ spin_unlock_irqrestore(&pool->lock, flags); |
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|
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page = pool_alloc_page(pool, mem_flags); if (!page) return NULL; |
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|
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spin_lock_irqsave(&pool->lock, flags); |
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|
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list_add(&page->page_list, &pool->page_list); |
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ready: |
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page->in_use++; |
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offset = page->offset; page->offset = *(int *)(page->vaddr + offset); |
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retval = offset + page->vaddr; *handle = offset + page->dma; |
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#ifdef DMAPOOL_DEBUG |
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{ int i; u8 *data = retval; /* page->offset is stored in first 4 bytes */ for (i = sizeof(page->offset); i < pool->size; i++) { if (data[i] == POOL_POISON_FREED) continue; if (pool->dev) dev_err(pool->dev, "dma_pool_alloc %s, %p (corruped) ", pool->name, retval); else pr_err("dma_pool_alloc %s, %p (corruped) ", pool->name, retval); /* * Dump the first 4 bytes even if they are not * POOL_POISON_FREED */ print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, data, pool->size, 1); break; } } |
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memset(retval, POOL_POISON_ALLOCATED, pool->size); |
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#endif |
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spin_unlock_irqrestore(&pool->lock, flags); |
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return retval; } |
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EXPORT_SYMBOL(dma_pool_alloc); |
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|
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static struct dma_page *pool_find_page(struct dma_pool *pool, dma_addr_t dma) |
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{ |
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struct dma_page *page; |
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|
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list_for_each_entry(page, &pool->page_list, page_list) { if (dma < page->dma) continue; if (dma < (page->dma + pool->allocation)) |
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return page; |
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} |
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return NULL; |
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} |
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/** * dma_pool_free - put block back into dma pool * @pool: the dma pool holding the block * @vaddr: virtual address of block * @dma: dma address of block * * Caller promises neither device nor driver will again touch this block * unless it is first re-allocated. */ |
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void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t dma) |
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{ |
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struct dma_page *page; unsigned long flags; |
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unsigned int offset; |
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|
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spin_lock_irqsave(&pool->lock, flags); |
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page = pool_find_page(pool, dma); if (!page) { |
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spin_unlock_irqrestore(&pool->lock, flags); |
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if (pool->dev) |
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dev_err(pool->dev, "dma_pool_free %s, %p/%lx (bad dma) ", pool->name, vaddr, (unsigned long)dma); |
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else |
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printk(KERN_ERR "dma_pool_free %s, %p/%lx (bad dma) ", pool->name, vaddr, (unsigned long)dma); |
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return; } |
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offset = vaddr - page->vaddr; |
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#ifdef DMAPOOL_DEBUG |
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if ((dma - page->dma) != offset) { |
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spin_unlock_irqrestore(&pool->lock, flags); |
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401 |
if (pool->dev) |
e87aa7737 dmapool: Fix styl... |
402 403 404 405 |
dev_err(pool->dev, "dma_pool_free %s, %p (bad vaddr)/%Lx ", pool->name, vaddr, (unsigned long long)dma); |
1da177e4c Linux-2.6.12-rc2 |
406 |
else |
e87aa7737 dmapool: Fix styl... |
407 408 409 410 |
printk(KERN_ERR "dma_pool_free %s, %p (bad vaddr)/%Lx ", pool->name, vaddr, (unsigned long long)dma); |
1da177e4c Linux-2.6.12-rc2 |
411 412 |
return; } |
a35a34551 Change dmapool fr... |
413 414 415 416 417 418 419 |
{ unsigned int chain = page->offset; while (chain < pool->allocation) { if (chain != offset) { chain = *(int *)(page->vaddr + chain); continue; } |
84bc227d7 mm/dmapool.c: tak... |
420 |
spin_unlock_irqrestore(&pool->lock, flags); |
a35a34551 Change dmapool fr... |
421 422 423 424 425 426 427 428 429 430 431 432 |
if (pool->dev) dev_err(pool->dev, "dma_pool_free %s, dma %Lx " "already free ", pool->name, (unsigned long long)dma); else printk(KERN_ERR "dma_pool_free %s, dma %Lx " "already free ", pool->name, (unsigned long long)dma); return; } |
1da177e4c Linux-2.6.12-rc2 |
433 |
} |
e87aa7737 dmapool: Fix styl... |
434 |
memset(vaddr, POOL_POISON_FREED, pool->size); |
1da177e4c Linux-2.6.12-rc2 |
435 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
436 |
page->in_use--; |
a35a34551 Change dmapool fr... |
437 438 |
*(int *)vaddr = page->offset; page->offset = offset; |
1da177e4c Linux-2.6.12-rc2 |
439 440 |
/* * Resist a temptation to do |
a35a34551 Change dmapool fr... |
441 |
* if (!is_page_busy(page)) pool_free_page(pool, page); |
1da177e4c Linux-2.6.12-rc2 |
442 443 |
* Better have a few empty pages hang around. */ |
e87aa7737 dmapool: Fix styl... |
444 |
spin_unlock_irqrestore(&pool->lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
445 |
} |
e87aa7737 dmapool: Fix styl... |
446 |
EXPORT_SYMBOL(dma_pool_free); |
1da177e4c Linux-2.6.12-rc2 |
447 |
|
9ac7849e3 devres: device re... |
448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 |
/* * Managed DMA pool */ static void dmam_pool_release(struct device *dev, void *res) { struct dma_pool *pool = *(struct dma_pool **)res; dma_pool_destroy(pool); } static int dmam_pool_match(struct device *dev, void *res, void *match_data) { return *(struct dma_pool **)res == match_data; } /** * dmam_pool_create - Managed dma_pool_create() * @name: name of pool, for diagnostics * @dev: device that will be doing the DMA * @size: size of the blocks in this pool. * @align: alignment requirement for blocks; must be a power of two * @allocation: returned blocks won't cross this boundary (or zero) * * Managed dma_pool_create(). DMA pool created with this function is * automatically destroyed on driver detach. */ struct dma_pool *dmam_pool_create(const char *name, struct device *dev, size_t size, size_t align, size_t allocation) { struct dma_pool **ptr, *pool; ptr = devres_alloc(dmam_pool_release, sizeof(*ptr), GFP_KERNEL); if (!ptr) return NULL; pool = *ptr = dma_pool_create(name, dev, size, align, allocation); if (pool) devres_add(dev, ptr); else devres_free(ptr); return pool; } |
e87aa7737 dmapool: Fix styl... |
491 |
EXPORT_SYMBOL(dmam_pool_create); |
9ac7849e3 devres: device re... |
492 493 494 495 496 497 498 499 500 501 |
/** * dmam_pool_destroy - Managed dma_pool_destroy() * @pool: dma pool that will be destroyed * * Managed dma_pool_destroy(). */ void dmam_pool_destroy(struct dma_pool *pool) { struct device *dev = pool->dev; |
9ac7849e3 devres: device re... |
502 |
WARN_ON(devres_destroy(dev, dmam_pool_release, dmam_pool_match, pool)); |
ae891a1b9 devres: fix possi... |
503 |
dma_pool_destroy(pool); |
9ac7849e3 devres: device re... |
504 |
} |
e87aa7737 dmapool: Fix styl... |
505 |
EXPORT_SYMBOL(dmam_pool_destroy); |