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:
parent
141e9d4b54
commit
e87aa77374
1 changed files with 141 additions and 145 deletions
286
mm/dmapool.c
286
mm/dmapool.c
|
@ -15,32 +15,32 @@
|
|||
* This should probably be sharing the guts of the slab allocator.
|
||||
*/
|
||||
|
||||
struct dma_pool { /* the pool */
|
||||
struct list_head page_list;
|
||||
spinlock_t lock;
|
||||
size_t blocks_per_page;
|
||||
size_t size;
|
||||
struct device *dev;
|
||||
size_t allocation;
|
||||
char name [32];
|
||||
wait_queue_head_t waitq;
|
||||
struct list_head pools;
|
||||
struct dma_pool { /* the pool */
|
||||
struct list_head page_list;
|
||||
spinlock_t lock;
|
||||
size_t blocks_per_page;
|
||||
size_t size;
|
||||
struct device *dev;
|
||||
size_t allocation;
|
||||
char name[32];
|
||||
wait_queue_head_t waitq;
|
||||
struct list_head pools;
|
||||
};
|
||||
|
||||
struct dma_page { /* cacheable header for 'allocation' bytes */
|
||||
struct list_head page_list;
|
||||
void *vaddr;
|
||||
dma_addr_t dma;
|
||||
unsigned in_use;
|
||||
unsigned long bitmap [0];
|
||||
struct dma_page { /* cacheable header for 'allocation' bytes */
|
||||
struct list_head page_list;
|
||||
void *vaddr;
|
||||
dma_addr_t dma;
|
||||
unsigned in_use;
|
||||
unsigned long bitmap[0];
|
||||
};
|
||||
|
||||
#define POOL_TIMEOUT_JIFFIES ((100 /* msec */ * HZ) / 1000)
|
||||
|
||||
static DEFINE_MUTEX (pools_lock);
|
||||
static DEFINE_MUTEX(pools_lock);
|
||||
|
||||
static ssize_t
|
||||
show_pools (struct device *dev, struct device_attribute *attr, char *buf)
|
||||
show_pools(struct device *dev, struct device_attribute *attr, char *buf)
|
||||
{
|
||||
unsigned temp;
|
||||
unsigned size;
|
||||
|
@ -67,9 +67,9 @@ show_pools (struct device *dev, struct device_attribute *attr, char *buf)
|
|||
|
||||
/* per-pool info, no real statistics yet */
|
||||
temp = scnprintf(next, size, "%-16s %4u %4Zu %4Zu %2u\n",
|
||||
pool->name,
|
||||
blocks, pages * pool->blocks_per_page,
|
||||
pool->size, pages);
|
||||
pool->name,
|
||||
blocks, pages * pool->blocks_per_page,
|
||||
pool->size, pages);
|
||||
size -= temp;
|
||||
next += temp;
|
||||
}
|
||||
|
@ -77,7 +77,8 @@ show_pools (struct device *dev, struct device_attribute *attr, char *buf)
|
|||
|
||||
return PAGE_SIZE - size;
|
||||
}
|
||||
static DEVICE_ATTR (pools, S_IRUGO, show_pools, NULL);
|
||||
|
||||
static DEVICE_ATTR(pools, S_IRUGO, show_pools, NULL);
|
||||
|
||||
/**
|
||||
* dma_pool_create - Creates a pool of consistent memory blocks, for dma.
|
||||
|
@ -100,11 +101,10 @@ static DEVICE_ATTR (pools, S_IRUGO, show_pools, NULL);
|
|||
* addressing restrictions on individual DMA transfers, such as not crossing
|
||||
* boundaries of 4KBytes.
|
||||
*/
|
||||
struct dma_pool *
|
||||
dma_pool_create (const char *name, struct device *dev,
|
||||
size_t size, size_t align, size_t allocation)
|
||||
struct dma_pool *dma_pool_create(const char *name, struct device *dev,
|
||||
size_t size, size_t align, size_t allocation)
|
||||
{
|
||||
struct dma_pool *retval;
|
||||
struct dma_pool *retval;
|
||||
|
||||
if (align == 0)
|
||||
align = 1;
|
||||
|
@ -122,81 +122,79 @@ dma_pool_create (const char *name, struct device *dev,
|
|||
allocation = size;
|
||||
else
|
||||
allocation = PAGE_SIZE;
|
||||
// FIXME: round up for less fragmentation
|
||||
/* FIXME: round up for less fragmentation */
|
||||
} else if (allocation < size)
|
||||
return NULL;
|
||||
|
||||
if (!(retval = kmalloc_node (sizeof *retval, GFP_KERNEL, dev_to_node(dev))))
|
||||
if (!
|
||||
(retval =
|
||||
kmalloc_node(sizeof *retval, GFP_KERNEL, dev_to_node(dev))))
|
||||
return retval;
|
||||
|
||||
strlcpy (retval->name, name, sizeof retval->name);
|
||||
strlcpy(retval->name, name, sizeof retval->name);
|
||||
|
||||
retval->dev = dev;
|
||||
|
||||
INIT_LIST_HEAD (&retval->page_list);
|
||||
spin_lock_init (&retval->lock);
|
||||
INIT_LIST_HEAD(&retval->page_list);
|
||||
spin_lock_init(&retval->lock);
|
||||
retval->size = size;
|
||||
retval->allocation = allocation;
|
||||
retval->blocks_per_page = allocation / size;
|
||||
init_waitqueue_head (&retval->waitq);
|
||||
init_waitqueue_head(&retval->waitq);
|
||||
|
||||
if (dev) {
|
||||
int ret;
|
||||
|
||||
mutex_lock(&pools_lock);
|
||||
if (list_empty (&dev->dma_pools))
|
||||
ret = device_create_file (dev, &dev_attr_pools);
|
||||
if (list_empty(&dev->dma_pools))
|
||||
ret = device_create_file(dev, &dev_attr_pools);
|
||||
else
|
||||
ret = 0;
|
||||
/* note: not currently insisting "name" be unique */
|
||||
if (!ret)
|
||||
list_add (&retval->pools, &dev->dma_pools);
|
||||
list_add(&retval->pools, &dev->dma_pools);
|
||||
else {
|
||||
kfree(retval);
|
||||
retval = NULL;
|
||||
}
|
||||
mutex_unlock(&pools_lock);
|
||||
} else
|
||||
INIT_LIST_HEAD (&retval->pools);
|
||||
INIT_LIST_HEAD(&retval->pools);
|
||||
|
||||
return retval;
|
||||
}
|
||||
EXPORT_SYMBOL(dma_pool_create);
|
||||
|
||||
|
||||
static struct dma_page *
|
||||
pool_alloc_page (struct dma_pool *pool, gfp_t mem_flags)
|
||||
static struct dma_page *pool_alloc_page(struct dma_pool *pool, gfp_t mem_flags)
|
||||
{
|
||||
struct dma_page *page;
|
||||
int mapsize;
|
||||
struct dma_page *page;
|
||||
int mapsize;
|
||||
|
||||
mapsize = pool->blocks_per_page;
|
||||
mapsize = (mapsize + BITS_PER_LONG - 1) / BITS_PER_LONG;
|
||||
mapsize *= sizeof (long);
|
||||
mapsize *= sizeof(long);
|
||||
|
||||
page = kmalloc(mapsize + sizeof *page, mem_flags);
|
||||
if (!page)
|
||||
return NULL;
|
||||
page->vaddr = dma_alloc_coherent (pool->dev,
|
||||
pool->allocation,
|
||||
&page->dma,
|
||||
mem_flags);
|
||||
page->vaddr = dma_alloc_coherent(pool->dev,
|
||||
pool->allocation,
|
||||
&page->dma, mem_flags);
|
||||
if (page->vaddr) {
|
||||
memset (page->bitmap, 0xff, mapsize); // bit set == free
|
||||
memset(page->bitmap, 0xff, mapsize); /* bit set == free */
|
||||
#ifdef CONFIG_DEBUG_SLAB
|
||||
memset (page->vaddr, POOL_POISON_FREED, pool->allocation);
|
||||
memset(page->vaddr, POOL_POISON_FREED, pool->allocation);
|
||||
#endif
|
||||
list_add (&page->page_list, &pool->page_list);
|
||||
list_add(&page->page_list, &pool->page_list);
|
||||
page->in_use = 0;
|
||||
} else {
|
||||
kfree (page);
|
||||
kfree(page);
|
||||
page = NULL;
|
||||
}
|
||||
return page;
|
||||
}
|
||||
|
||||
|
||||
static inline int
|
||||
is_page_busy (int blocks, unsigned long *bitmap)
|
||||
static inline int is_page_busy(int blocks, unsigned long *bitmap)
|
||||
{
|
||||
while (blocks > 0) {
|
||||
if (*bitmap++ != ~0UL)
|
||||
|
@ -206,20 +204,18 @@ is_page_busy (int blocks, unsigned long *bitmap)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
pool_free_page (struct dma_pool *pool, struct dma_page *page)
|
||||
static void pool_free_page(struct dma_pool *pool, struct dma_page *page)
|
||||
{
|
||||
dma_addr_t dma = page->dma;
|
||||
dma_addr_t dma = page->dma;
|
||||
|
||||
#ifdef CONFIG_DEBUG_SLAB
|
||||
memset (page->vaddr, POOL_POISON_FREED, pool->allocation);
|
||||
memset(page->vaddr, POOL_POISON_FREED, pool->allocation);
|
||||
#endif
|
||||
dma_free_coherent (pool->dev, pool->allocation, page->vaddr, dma);
|
||||
list_del (&page->page_list);
|
||||
kfree (page);
|
||||
dma_free_coherent(pool->dev, pool->allocation, page->vaddr, dma);
|
||||
list_del(&page->page_list);
|
||||
kfree(page);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* dma_pool_destroy - destroys a pool of dma memory blocks.
|
||||
* @pool: dma pool that will be destroyed
|
||||
|
@ -228,36 +224,37 @@ pool_free_page (struct dma_pool *pool, struct dma_page *page)
|
|||
* Caller guarantees that no more memory from the pool is in use,
|
||||
* and that nothing will try to use the pool after this call.
|
||||
*/
|
||||
void
|
||||
dma_pool_destroy (struct dma_pool *pool)
|
||||
void dma_pool_destroy(struct dma_pool *pool)
|
||||
{
|
||||
mutex_lock(&pools_lock);
|
||||
list_del (&pool->pools);
|
||||
if (pool->dev && list_empty (&pool->dev->dma_pools))
|
||||
device_remove_file (pool->dev, &dev_attr_pools);
|
||||
list_del(&pool->pools);
|
||||
if (pool->dev && list_empty(&pool->dev->dma_pools))
|
||||
device_remove_file(pool->dev, &dev_attr_pools);
|
||||
mutex_unlock(&pools_lock);
|
||||
|
||||
while (!list_empty (&pool->page_list)) {
|
||||
struct dma_page *page;
|
||||
page = list_entry (pool->page_list.next,
|
||||
struct dma_page, page_list);
|
||||
if (is_page_busy (pool->blocks_per_page, page->bitmap)) {
|
||||
while (!list_empty(&pool->page_list)) {
|
||||
struct dma_page *page;
|
||||
page = list_entry(pool->page_list.next,
|
||||
struct dma_page, page_list);
|
||||
if (is_page_busy(pool->blocks_per_page, page->bitmap)) {
|
||||
if (pool->dev)
|
||||
dev_err(pool->dev, "dma_pool_destroy %s, %p busy\n",
|
||||
dev_err(pool->dev,
|
||||
"dma_pool_destroy %s, %p busy\n",
|
||||
pool->name, page->vaddr);
|
||||
else
|
||||
printk (KERN_ERR "dma_pool_destroy %s, %p busy\n",
|
||||
pool->name, page->vaddr);
|
||||
printk(KERN_ERR
|
||||
"dma_pool_destroy %s, %p busy\n",
|
||||
pool->name, page->vaddr);
|
||||
/* leak the still-in-use consistent memory */
|
||||
list_del (&page->page_list);
|
||||
kfree (page);
|
||||
list_del(&page->page_list);
|
||||
kfree(page);
|
||||
} else
|
||||
pool_free_page (pool, page);
|
||||
pool_free_page(pool, page);
|
||||
}
|
||||
|
||||
kfree (pool);
|
||||
kfree(pool);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(dma_pool_destroy);
|
||||
|
||||
/**
|
||||
* dma_pool_alloc - get a block of consistent memory
|
||||
|
@ -269,73 +266,72 @@ dma_pool_destroy (struct dma_pool *pool)
|
|||
* and reports its dma address through the handle.
|
||||
* If such a memory block can't be allocated, null is returned.
|
||||
*/
|
||||
void *
|
||||
dma_pool_alloc (struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle)
|
||||
void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
|
||||
dma_addr_t *handle)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct dma_page *page;
|
||||
int map, block;
|
||||
size_t offset;
|
||||
void *retval;
|
||||
unsigned long flags;
|
||||
struct dma_page *page;
|
||||
int map, block;
|
||||
size_t offset;
|
||||
void *retval;
|
||||
|
||||
restart:
|
||||
spin_lock_irqsave (&pool->lock, flags);
|
||||
restart:
|
||||
spin_lock_irqsave(&pool->lock, flags);
|
||||
list_for_each_entry(page, &pool->page_list, page_list) {
|
||||
int i;
|
||||
int i;
|
||||
/* only cachable accesses here ... */
|
||||
for (map = 0, i = 0;
|
||||
i < pool->blocks_per_page;
|
||||
i += BITS_PER_LONG, map++) {
|
||||
if (page->bitmap [map] == 0)
|
||||
i < pool->blocks_per_page; i += BITS_PER_LONG, map++) {
|
||||
if (page->bitmap[map] == 0)
|
||||
continue;
|
||||
block = ffz (~ page->bitmap [map]);
|
||||
block = ffz(~page->bitmap[map]);
|
||||
if ((i + block) < pool->blocks_per_page) {
|
||||
clear_bit (block, &page->bitmap [map]);
|
||||
clear_bit(block, &page->bitmap[map]);
|
||||
offset = (BITS_PER_LONG * map) + block;
|
||||
offset *= pool->size;
|
||||
goto ready;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (!(page = pool_alloc_page (pool, GFP_ATOMIC))) {
|
||||
page = pool_alloc_page(pool, GFP_ATOMIC);
|
||||
if (!page) {
|
||||
if (mem_flags & __GFP_WAIT) {
|
||||
DECLARE_WAITQUEUE (wait, current);
|
||||
DECLARE_WAITQUEUE(wait, current);
|
||||
|
||||
__set_current_state(TASK_INTERRUPTIBLE);
|
||||
add_wait_queue (&pool->waitq, &wait);
|
||||
spin_unlock_irqrestore (&pool->lock, flags);
|
||||
add_wait_queue(&pool->waitq, &wait);
|
||||
spin_unlock_irqrestore(&pool->lock, flags);
|
||||
|
||||
schedule_timeout (POOL_TIMEOUT_JIFFIES);
|
||||
schedule_timeout(POOL_TIMEOUT_JIFFIES);
|
||||
|
||||
remove_wait_queue (&pool->waitq, &wait);
|
||||
remove_wait_queue(&pool->waitq, &wait);
|
||||
goto restart;
|
||||
}
|
||||
retval = NULL;
|
||||
goto done;
|
||||
}
|
||||
|
||||
clear_bit (0, &page->bitmap [0]);
|
||||
clear_bit(0, &page->bitmap[0]);
|
||||
offset = 0;
|
||||
ready:
|
||||
ready:
|
||||
page->in_use++;
|
||||
retval = offset + page->vaddr;
|
||||
*handle = offset + page->dma;
|
||||
#ifdef CONFIG_DEBUG_SLAB
|
||||
memset (retval, POOL_POISON_ALLOCATED, pool->size);
|
||||
memset(retval, POOL_POISON_ALLOCATED, pool->size);
|
||||
#endif
|
||||
done:
|
||||
spin_unlock_irqrestore (&pool->lock, flags);
|
||||
done:
|
||||
spin_unlock_irqrestore(&pool->lock, flags);
|
||||
return retval;
|
||||
}
|
||||
EXPORT_SYMBOL(dma_pool_alloc);
|
||||
|
||||
|
||||
static struct dma_page *
|
||||
pool_find_page (struct dma_pool *pool, dma_addr_t dma)
|
||||
static struct dma_page *pool_find_page(struct dma_pool *pool, dma_addr_t dma)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct dma_page *page;
|
||||
unsigned long flags;
|
||||
struct dma_page *page;
|
||||
|
||||
spin_lock_irqsave (&pool->lock, flags);
|
||||
spin_lock_irqsave(&pool->lock, flags);
|
||||
list_for_each_entry(page, &pool->page_list, page_list) {
|
||||
if (dma < page->dma)
|
||||
continue;
|
||||
|
@ -343,12 +339,11 @@ pool_find_page (struct dma_pool *pool, dma_addr_t dma)
|
|||
goto done;
|
||||
}
|
||||
page = NULL;
|
||||
done:
|
||||
spin_unlock_irqrestore (&pool->lock, flags);
|
||||
done:
|
||||
spin_unlock_irqrestore(&pool->lock, flags);
|
||||
return page;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* dma_pool_free - put block back into dma pool
|
||||
* @pool: the dma pool holding the block
|
||||
|
@ -358,20 +353,21 @@ pool_find_page (struct dma_pool *pool, dma_addr_t dma)
|
|||
* Caller promises neither device nor driver will again touch this block
|
||||
* unless it is first re-allocated.
|
||||
*/
|
||||
void
|
||||
dma_pool_free (struct dma_pool *pool, void *vaddr, dma_addr_t dma)
|
||||
void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t dma)
|
||||
{
|
||||
struct dma_page *page;
|
||||
unsigned long flags;
|
||||
int map, block;
|
||||
struct dma_page *page;
|
||||
unsigned long flags;
|
||||
int map, block;
|
||||
|
||||
if ((page = pool_find_page(pool, dma)) == NULL) {
|
||||
page = pool_find_page(pool, dma);
|
||||
if (!page) {
|
||||
if (pool->dev)
|
||||
dev_err(pool->dev, "dma_pool_free %s, %p/%lx (bad dma)\n",
|
||||
pool->name, vaddr, (unsigned long) dma);
|
||||
dev_err(pool->dev,
|
||||
"dma_pool_free %s, %p/%lx (bad dma)\n",
|
||||
pool->name, vaddr, (unsigned long)dma);
|
||||
else
|
||||
printk (KERN_ERR "dma_pool_free %s, %p/%lx (bad dma)\n",
|
||||
pool->name, vaddr, (unsigned long) dma);
|
||||
printk(KERN_ERR "dma_pool_free %s, %p/%lx (bad dma)\n",
|
||||
pool->name, vaddr, (unsigned long)dma);
|
||||
return;
|
||||
}
|
||||
|
||||
|
@ -383,37 +379,42 @@ dma_pool_free (struct dma_pool *pool, void *vaddr, dma_addr_t dma)
|
|||
#ifdef CONFIG_DEBUG_SLAB
|
||||
if (((dma - page->dma) + (void *)page->vaddr) != vaddr) {
|
||||
if (pool->dev)
|
||||
dev_err(pool->dev, "dma_pool_free %s, %p (bad vaddr)/%Lx\n",
|
||||
pool->name, vaddr, (unsigned long long) dma);
|
||||
dev_err(pool->dev,
|
||||
"dma_pool_free %s, %p (bad vaddr)/%Lx\n",
|
||||
pool->name, vaddr, (unsigned long long)dma);
|
||||
else
|
||||
printk (KERN_ERR "dma_pool_free %s, %p (bad vaddr)/%Lx\n",
|
||||
pool->name, vaddr, (unsigned long long) dma);
|
||||
printk(KERN_ERR
|
||||
"dma_pool_free %s, %p (bad vaddr)/%Lx\n",
|
||||
pool->name, vaddr, (unsigned long long)dma);
|
||||
return;
|
||||
}
|
||||
if (page->bitmap [map] & (1UL << block)) {
|
||||
if (page->bitmap[map] & (1UL << block)) {
|
||||
if (pool->dev)
|
||||
dev_err(pool->dev, "dma_pool_free %s, dma %Lx already free\n",
|
||||
dev_err(pool->dev,
|
||||
"dma_pool_free %s, dma %Lx already free\n",
|
||||
pool->name, (unsigned long long)dma);
|
||||
else
|
||||
printk (KERN_ERR "dma_pool_free %s, dma %Lx already free\n",
|
||||
pool->name, (unsigned long long)dma);
|
||||
printk(KERN_ERR
|
||||
"dma_pool_free %s, dma %Lx already free\n",
|
||||
pool->name, (unsigned long long)dma);
|
||||
return;
|
||||
}
|
||||
memset (vaddr, POOL_POISON_FREED, pool->size);
|
||||
memset(vaddr, POOL_POISON_FREED, pool->size);
|
||||
#endif
|
||||
|
||||
spin_lock_irqsave (&pool->lock, flags);
|
||||
spin_lock_irqsave(&pool->lock, flags);
|
||||
page->in_use--;
|
||||
set_bit (block, &page->bitmap [map]);
|
||||
if (waitqueue_active (&pool->waitq))
|
||||
wake_up (&pool->waitq);
|
||||
set_bit(block, &page->bitmap[map]);
|
||||
if (waitqueue_active(&pool->waitq))
|
||||
wake_up(&pool->waitq);
|
||||
/*
|
||||
* Resist a temptation to do
|
||||
* if (!is_page_busy(bpp, page->bitmap)) pool_free_page(pool, page);
|
||||
* Better have a few empty pages hang around.
|
||||
*/
|
||||
spin_unlock_irqrestore (&pool->lock, flags);
|
||||
spin_unlock_irqrestore(&pool->lock, flags);
|
||||
}
|
||||
EXPORT_SYMBOL(dma_pool_free);
|
||||
|
||||
/*
|
||||
* Managed DMA pool
|
||||
|
@ -458,6 +459,7 @@ struct dma_pool *dmam_pool_create(const char *name, struct device *dev,
|
|||
|
||||
return pool;
|
||||
}
|
||||
EXPORT_SYMBOL(dmam_pool_create);
|
||||
|
||||
/**
|
||||
* 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 a new issue