mirror of https://gitee.com/openkylin/linux.git
dmapool: Fix style problems
Run Lindent and fix all issues reported by checkpatch.pl Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
This commit is contained in:
Matthew Wilcox
parent
141e9d4b54
commit
e87aa77374
210
mm/dmapool.c
210
mm/dmapool.c
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@ -22,7 +22,7 @@ struct dma_pool { /* the pool */
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size_t size;
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struct device *dev;
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size_t allocation;
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char name [32];
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char name[32];
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wait_queue_head_t waitq;
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struct list_head pools;
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};
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@ -32,15 +32,15 @@ struct dma_page { /* cacheable header for 'allocation' bytes */
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void *vaddr;
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dma_addr_t dma;
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unsigned in_use;
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unsigned long bitmap [0];
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unsigned long bitmap[0];
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};
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#define POOL_TIMEOUT_JIFFIES ((100 /* msec */ * HZ) / 1000)
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static DEFINE_MUTEX (pools_lock);
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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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show_pools(struct device *dev, struct device_attribute *attr, char *buf)
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{
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unsigned temp;
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unsigned size;
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@ -77,7 +77,8 @@ show_pools (struct device *dev, struct device_attribute *attr, char *buf)
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return PAGE_SIZE - size;
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}
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static DEVICE_ATTR (pools, S_IRUGO, show_pools, NULL);
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static DEVICE_ATTR(pools, S_IRUGO, show_pools, NULL);
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/**
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* dma_pool_create - Creates a pool of consistent memory blocks, for dma.
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@ -100,8 +101,7 @@ static DEVICE_ATTR (pools, S_IRUGO, show_pools, NULL);
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* addressing restrictions on individual DMA transfers, such as not crossing
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* boundaries of 4KBytes.
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*/
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struct dma_pool *
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dma_pool_create (const char *name, struct device *dev,
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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 allocation)
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{
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struct dma_pool *retval;
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@ -122,81 +122,79 @@ dma_pool_create (const char *name, struct device *dev,
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allocation = size;
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else
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allocation = PAGE_SIZE;
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// FIXME: round up for less fragmentation
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/* FIXME: round up for less fragmentation */
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} else if (allocation < size)
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return NULL;
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if (!(retval = kmalloc_node (sizeof *retval, GFP_KERNEL, dev_to_node(dev))))
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if (!
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(retval =
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kmalloc_node(sizeof *retval, GFP_KERNEL, dev_to_node(dev))))
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return retval;
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strlcpy (retval->name, name, sizeof retval->name);
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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);
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spin_lock_init (&retval->lock);
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INIT_LIST_HEAD(&retval->page_list);
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spin_lock_init(&retval->lock);
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retval->size = size;
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retval->allocation = allocation;
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retval->blocks_per_page = allocation / size;
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init_waitqueue_head (&retval->waitq);
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init_waitqueue_head(&retval->waitq);
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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))
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ret = device_create_file (dev, &dev_attr_pools);
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if (list_empty(&dev->dma_pools))
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ret = device_create_file(dev, &dev_attr_pools);
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else
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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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list_add(&retval->pools, &dev->dma_pools);
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else {
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kfree(retval);
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retval = NULL;
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}
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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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INIT_LIST_HEAD(&retval->pools);
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return retval;
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}
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EXPORT_SYMBOL(dma_pool_create);
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static struct dma_page *
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pool_alloc_page (struct dma_pool *pool, gfp_t mem_flags)
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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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int mapsize;
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mapsize = pool->blocks_per_page;
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mapsize = (mapsize + BITS_PER_LONG - 1) / BITS_PER_LONG;
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mapsize *= sizeof (long);
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mapsize *= sizeof(long);
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page = kmalloc(mapsize + sizeof *page, mem_flags);
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if (!page)
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return NULL;
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page->vaddr = dma_alloc_coherent (pool->dev,
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page->vaddr = dma_alloc_coherent(pool->dev,
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pool->allocation,
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&page->dma,
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mem_flags);
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&page->dma, mem_flags);
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if (page->vaddr) {
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memset (page->bitmap, 0xff, mapsize); // bit set == free
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memset(page->bitmap, 0xff, mapsize); /* bit set == free */
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#ifdef CONFIG_DEBUG_SLAB
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memset (page->vaddr, POOL_POISON_FREED, pool->allocation);
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memset(page->vaddr, POOL_POISON_FREED, pool->allocation);
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#endif
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list_add (&page->page_list, &pool->page_list);
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list_add(&page->page_list, &pool->page_list);
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page->in_use = 0;
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} else {
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kfree (page);
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kfree(page);
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page = NULL;
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}
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return page;
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}
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static inline int
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is_page_busy (int blocks, unsigned long *bitmap)
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static inline int is_page_busy(int blocks, unsigned long *bitmap)
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{
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while (blocks > 0) {
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if (*bitmap++ != ~0UL)
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@ -206,20 +204,18 @@ is_page_busy (int blocks, unsigned long *bitmap)
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return 0;
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}
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static void
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pool_free_page (struct dma_pool *pool, struct dma_page *page)
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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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#ifdef CONFIG_DEBUG_SLAB
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memset (page->vaddr, POOL_POISON_FREED, pool->allocation);
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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);
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list_del (&page->page_list);
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kfree (page);
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dma_free_coherent(pool->dev, pool->allocation, page->vaddr, dma);
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list_del(&page->page_list);
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kfree(page);
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}
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/**
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* dma_pool_destroy - destroys a pool of dma memory blocks.
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* @pool: dma pool that will be destroyed
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@ -228,36 +224,37 @@ pool_free_page (struct dma_pool *pool, struct dma_page *page)
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* Caller guarantees that no more memory from the pool is in use,
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* and that nothing will try to use the pool after this call.
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*/
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void
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dma_pool_destroy (struct dma_pool *pool)
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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);
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if (pool->dev && list_empty (&pool->dev->dma_pools))
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device_remove_file (pool->dev, &dev_attr_pools);
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list_del(&pool->pools);
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if (pool->dev && list_empty(&pool->dev->dma_pools))
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device_remove_file(pool->dev, &dev_attr_pools);
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mutex_unlock(&pools_lock);
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while (!list_empty (&pool->page_list)) {
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while (!list_empty(&pool->page_list)) {
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struct dma_page *page;
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page = list_entry (pool->page_list.next,
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page = list_entry(pool->page_list.next,
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struct dma_page, page_list);
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if (is_page_busy (pool->blocks_per_page, page->bitmap)) {
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if (is_page_busy(pool->blocks_per_page, page->bitmap)) {
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if (pool->dev)
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dev_err(pool->dev, "dma_pool_destroy %s, %p busy\n",
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dev_err(pool->dev,
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"dma_pool_destroy %s, %p busy\n",
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pool->name, page->vaddr);
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else
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printk (KERN_ERR "dma_pool_destroy %s, %p busy\n",
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printk(KERN_ERR
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"dma_pool_destroy %s, %p busy\n",
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pool->name, page->vaddr);
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/* leak the still-in-use consistent memory */
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list_del (&page->page_list);
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kfree (page);
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list_del(&page->page_list);
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kfree(page);
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} else
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pool_free_page (pool, page);
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pool_free_page(pool, page);
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}
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kfree (pool);
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kfree(pool);
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}
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EXPORT_SYMBOL(dma_pool_destroy);
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/**
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* dma_pool_alloc - get a block of consistent memory
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@ -269,8 +266,8 @@ dma_pool_destroy (struct dma_pool *pool)
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* 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 *
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dma_pool_alloc (struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle)
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void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
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dma_addr_t *handle)
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{
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unsigned long flags;
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struct dma_page *page;
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@ -278,64 +275,63 @@ dma_pool_alloc (struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle)
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size_t offset;
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void *retval;
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restart:
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spin_lock_irqsave (&pool->lock, flags);
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restart:
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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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int i;
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/* only cachable accesses here ... */
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for (map = 0, i = 0;
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i < pool->blocks_per_page;
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i += BITS_PER_LONG, map++) {
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if (page->bitmap [map] == 0)
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i < pool->blocks_per_page; i += BITS_PER_LONG, map++) {
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if (page->bitmap[map] == 0)
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continue;
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block = ffz (~ page->bitmap [map]);
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block = ffz(~page->bitmap[map]);
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if ((i + block) < pool->blocks_per_page) {
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clear_bit (block, &page->bitmap [map]);
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clear_bit(block, &page->bitmap[map]);
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offset = (BITS_PER_LONG * map) + block;
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offset *= pool->size;
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goto ready;
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}
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}
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}
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if (!(page = pool_alloc_page (pool, GFP_ATOMIC))) {
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page = pool_alloc_page(pool, GFP_ATOMIC);
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if (!page) {
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if (mem_flags & __GFP_WAIT) {
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DECLARE_WAITQUEUE (wait, current);
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DECLARE_WAITQUEUE(wait, current);
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__set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue (&pool->waitq, &wait);
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spin_unlock_irqrestore (&pool->lock, flags);
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add_wait_queue(&pool->waitq, &wait);
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spin_unlock_irqrestore(&pool->lock, flags);
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schedule_timeout (POOL_TIMEOUT_JIFFIES);
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schedule_timeout(POOL_TIMEOUT_JIFFIES);
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remove_wait_queue (&pool->waitq, &wait);
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remove_wait_queue(&pool->waitq, &wait);
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goto restart;
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}
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retval = NULL;
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goto done;
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}
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clear_bit (0, &page->bitmap [0]);
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clear_bit(0, &page->bitmap[0]);
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offset = 0;
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ready:
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ready:
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page->in_use++;
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retval = offset + page->vaddr;
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*handle = offset + page->dma;
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#ifdef CONFIG_DEBUG_SLAB
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memset (retval, POOL_POISON_ALLOCATED, pool->size);
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memset(retval, POOL_POISON_ALLOCATED, pool->size);
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#endif
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done:
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spin_unlock_irqrestore (&pool->lock, flags);
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done:
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spin_unlock_irqrestore(&pool->lock, flags);
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return retval;
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}
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EXPORT_SYMBOL(dma_pool_alloc);
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static struct dma_page *
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pool_find_page (struct dma_pool *pool, dma_addr_t dma)
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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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unsigned long flags;
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struct dma_page *page;
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spin_lock_irqsave (&pool->lock, flags);
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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 (dma < page->dma)
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continue;
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@ -343,12 +339,11 @@ pool_find_page (struct dma_pool *pool, dma_addr_t dma)
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goto done;
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}
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page = NULL;
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done:
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spin_unlock_irqrestore (&pool->lock, flags);
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done:
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spin_unlock_irqrestore(&pool->lock, flags);
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return page;
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}
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/**
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* dma_pool_free - put block back into dma pool
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* @pool: the dma pool holding the block
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@ -358,20 +353,21 @@ pool_find_page (struct dma_pool *pool, dma_addr_t dma)
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* Caller promises neither device nor driver will again touch this block
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* unless it is first re-allocated.
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*/
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void
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dma_pool_free (struct dma_pool *pool, void *vaddr, dma_addr_t dma)
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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;
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unsigned long flags;
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int map, block;
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if ((page = pool_find_page(pool, dma)) == NULL) {
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page = pool_find_page(pool, dma);
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if (!page) {
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if (pool->dev)
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dev_err(pool->dev, "dma_pool_free %s, %p/%lx (bad dma)\n",
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pool->name, vaddr, (unsigned long) dma);
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dev_err(pool->dev,
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"dma_pool_free %s, %p/%lx (bad dma)\n",
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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)\n",
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pool->name, vaddr, (unsigned long) dma);
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printk(KERN_ERR "dma_pool_free %s, %p/%lx (bad dma)\n",
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pool->name, vaddr, (unsigned long)dma);
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return;
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}
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@ -383,37 +379,42 @@ dma_pool_free (struct dma_pool *pool, void *vaddr, dma_addr_t dma)
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#ifdef CONFIG_DEBUG_SLAB
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if (((dma - page->dma) + (void *)page->vaddr) != vaddr) {
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if (pool->dev)
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dev_err(pool->dev, "dma_pool_free %s, %p (bad vaddr)/%Lx\n",
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pool->name, vaddr, (unsigned long long) dma);
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dev_err(pool->dev,
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"dma_pool_free %s, %p (bad vaddr)/%Lx\n",
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pool->name, vaddr, (unsigned long long)dma);
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else
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printk (KERN_ERR "dma_pool_free %s, %p (bad vaddr)/%Lx\n",
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pool->name, vaddr, (unsigned long long) dma);
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printk(KERN_ERR
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"dma_pool_free %s, %p (bad vaddr)/%Lx\n",
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pool->name, vaddr, (unsigned long long)dma);
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return;
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}
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if (page->bitmap [map] & (1UL << block)) {
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if (page->bitmap[map] & (1UL << block)) {
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if (pool->dev)
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dev_err(pool->dev, "dma_pool_free %s, dma %Lx already free\n",
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dev_err(pool->dev,
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"dma_pool_free %s, dma %Lx already free\n",
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pool->name, (unsigned long long)dma);
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else
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printk (KERN_ERR "dma_pool_free %s, dma %Lx already free\n",
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printk(KERN_ERR
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"dma_pool_free %s, dma %Lx already free\n",
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pool->name, (unsigned long long)dma);
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return;
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}
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memset (vaddr, POOL_POISON_FREED, pool->size);
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memset(vaddr, POOL_POISON_FREED, pool->size);
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#endif
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spin_lock_irqsave (&pool->lock, flags);
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spin_lock_irqsave(&pool->lock, flags);
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page->in_use--;
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set_bit (block, &page->bitmap [map]);
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if (waitqueue_active (&pool->waitq))
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wake_up (&pool->waitq);
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set_bit(block, &page->bitmap[map]);
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if (waitqueue_active(&pool->waitq))
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wake_up(&pool->waitq);
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/*
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* Resist a temptation to do
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* if (!is_page_busy(bpp, page->bitmap)) pool_free_page(pool, page);
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* Better have a few empty pages hang around.
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*/
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spin_unlock_irqrestore (&pool->lock, flags);
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spin_unlock_irqrestore(&pool->lock, flags);
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}
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EXPORT_SYMBOL(dma_pool_free);
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/*
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* Managed DMA pool
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@ -458,6 +459,7 @@ struct dma_pool *dmam_pool_create(const char *name, struct device *dev,
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return pool;
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}
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EXPORT_SYMBOL(dmam_pool_create);
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/**
|
||||
* dmam_pool_destroy - Managed dma_pool_destroy()
|
||||
|
|
@ -472,10 +474,4 @@ void dmam_pool_destroy(struct dma_pool *pool)
|
|||
dma_pool_destroy(pool);
|
||||
WARN_ON(devres_destroy(dev, dmam_pool_release, dmam_pool_match, pool));
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL (dma_pool_create);
|
||||
EXPORT_SYMBOL (dma_pool_destroy);
|
||||
EXPORT_SYMBOL (dma_pool_alloc);
|
||||
EXPORT_SYMBOL (dma_pool_free);
|
||||
EXPORT_SYMBOL (dmam_pool_create);
|
||||
EXPORT_SYMBOL (dmam_pool_destroy);
|
||||
EXPORT_SYMBOL(dmam_pool_destroy);
|
||||
|
|
|
|||
Loading…
Reference in New Issue