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Merge branch 'for-v3.8' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 

Pull CMA and DMA-mapping update from Marek Szyprowski:
 "Another set of Contiguous Memory Allocator and DMA-mapping framework
  updates for v3.8.

  This pull request consists only of two patches.  The first fixes a
  long standing issue with dmapools (the code predates current GIT
  history), which forced all allocations to use GFP_ATOMIC flag,
  ignoring the flags passed by the caller.  The second patch changes CMA
  code to correctly use phys_addr_t type what enables support for LPAE
  systems."

* 'for-v3.8' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping:
  drivers: cma: represent physical addresses as phys_addr_t
  mm: dmapool: use provided gfp flags for all dma_alloc_coherent() calls
This commit is contained in:
Linus Torvalds 2012-12-11 11:27:10 -08:00
parent 93874681aa 4009793e15
commit c45564e916
3 changed files with 19 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/base/dma-contiguous.c
View File

@ -57,8 +57,8 @@ struct cma *dma_contiguous_default_area;
* Users, who want to set the size of global CMA area for their system
* should use cma= kernel parameter.
*/
static const unsigned long size_bytes = CMA_SIZE_MBYTES * SZ_1M;
static long size_cmdline = -1;
static const phys_addr_t size_bytes = CMA_SIZE_MBYTES * SZ_1M;
static phys_addr_t size_cmdline = -1;
static int __init early_cma(char *p)
{
@ -70,7 +70,7 @@ early_param("cma", early_cma);
#ifdef CONFIG_CMA_SIZE_PERCENTAGE
static unsigned long __init __maybe_unused cma_early_percent_memory(void)
static phys_addr_t __init __maybe_unused cma_early_percent_memory(void)
{
struct memblock_region *reg;
unsigned long total_pages = 0;
@ -88,7 +88,7 @@ static unsigned long __init __maybe_unused cma_early_percent_memory(void)
#else
static inline __maybe_unused unsigned long cma_early_percent_memory(void)
static inline __maybe_unused phys_addr_t cma_early_percent_memory(void)
{
return 0;
}
@ -106,7 +106,7 @@ static inline __maybe_unused unsigned long cma_early_percent_memory(void)
*/
void __init dma_contiguous_reserve(phys_addr_t limit)
{
unsigned long selected_size = 0;
phys_addr_t selected_size = 0;
pr_debug("%s(limit %08lx)\n", __func__, (unsigned long)limit);
@ -126,7 +126,7 @@ void __init dma_contiguous_reserve(phys_addr_t limit)
if (selected_size) {
pr_debug("%s: reserving %ld MiB for global area\n", __func__,
selected_size / SZ_1M);
(unsigned long)selected_size / SZ_1M);
dma_declare_contiguous(NULL, selected_size, 0, limit);
}
@ -227,11 +227,11 @@ core_initcall(cma_init_reserved_areas);
* called by board specific code when early allocator (memblock or bootmem)
* is still activate.
*/
int __init dma_declare_contiguous(struct device *dev, unsigned long size,
int __init dma_declare_contiguous(struct device *dev, phys_addr_t size,
phys_addr_t base, phys_addr_t limit)
{
struct cma_reserved *r = &cma_reserved[cma_reserved_count];
unsigned long alignment;
phys_addr_t alignment;
pr_debug("%s(size %lx, base %08lx, limit %08lx)\n", __func__,
(unsigned long)size, (unsigned long)base,
@ -268,10 +268,6 @@ int __init dma_declare_contiguous(struct device *dev, unsigned long size,
if (!addr) {
base = -ENOMEM;
goto err;
} else if (addr + size > ~(unsigned long)0) {
memblock_free(addr, size);
base = -EINVAL;
goto err;
} else {
base = addr;
}
@ -285,14 +281,14 @@ int __init dma_declare_contiguous(struct device *dev, unsigned long size,
r->size = size;
r->dev = dev;
cma_reserved_count++;
pr_info("CMA: reserved %ld MiB at %08lx\n", size / SZ_1M,
pr_info("CMA: reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M,
(unsigned long)base);
/* Architecture specific contiguous memory fixup. */
dma_contiguous_early_fixup(base, size);
return 0;
err:
pr_err("CMA: failed to reserve %ld MiB\n", size / SZ_1M);
pr_err("CMA: failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M);
return base;
}

4
include/linux/dma-contiguous.h
View File

@ -68,7 +68,7 @@ struct device;
extern struct cma *dma_contiguous_default_area;
void dma_contiguous_reserve(phys_addr_t addr_limit);
int dma_declare_contiguous(struct device *dev, unsigned long size,
int dma_declare_contiguous(struct device *dev, phys_addr_t size,
phys_addr_t base, phys_addr_t limit);
struct page *dma_alloc_from_contiguous(struct device *dev, int count,
@ -83,7 +83,7 @@ bool dma_release_from_contiguous(struct device *dev, struct page *pages,
static inline void dma_contiguous_reserve(phys_addr_t limit) { }
static inline
int dma_declare_contiguous(struct device *dev, unsigned long size,
int dma_declare_contiguous(struct device *dev, phys_addr_t size,
phys_addr_t base, phys_addr_t limit)
{
return -ENOSYS;

31
mm/dmapool.c
View File

@ -50,7 +50,6 @@ struct dma_pool { /* the pool */
size_t allocation;
size_t boundary;
char name[32];
wait_queue_head_t waitq;
struct list_head pools;
};
@ -62,8 +61,6 @@ struct dma_page { /* cacheable header for 'allocation' bytes */
unsigned int offset;
};
#define POOL_TIMEOUT_JIFFIES ((100 /* msec */ * HZ) / 1000)
static DEFINE_MUTEX(pools_lock);
static ssize_t
@ -172,7 +169,6 @@ struct dma_pool *dma_pool_create(const char *name, struct device *dev,
retval->size = size;
retval->boundary = boundary;
retval->allocation = allocation;
init_waitqueue_head(&retval->waitq);
if (dev) {
int ret;
@ -227,7 +223,6 @@ static struct dma_page *pool_alloc_page(struct dma_pool *pool, gfp_t mem_flags)
memset(page->vaddr, POOL_POISON_FREED, pool->allocation);
#endif
pool_initialise_page(pool, page);
list_add(&page->page_list, &pool->page_list);
page->in_use = 0;
page->offset = 0;
} else {
@ -315,30 +310,21 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
might_sleep_if(mem_flags & __GFP_WAIT);
spin_lock_irqsave(&pool->lock, flags);
restart:
list_for_each_entry(page, &pool->page_list, page_list) {
if (page->offset < pool->allocation)
goto ready;
}
page = pool_alloc_page(pool, GFP_ATOMIC);
if (!page) {
if (mem_flags & __GFP_WAIT) {
DECLARE_WAITQUEUE(wait, current);
__set_current_state(TASK_UNINTERRUPTIBLE);
__add_wait_queue(&pool->waitq, &wait);
spin_unlock_irqrestore(&pool->lock, flags);
/* pool_alloc_page() might sleep, so temporarily drop &pool->lock */
spin_unlock_irqrestore(&pool->lock, flags);
schedule_timeout(POOL_TIMEOUT_JIFFIES);
page = pool_alloc_page(pool, mem_flags);
if (!page)
return NULL;
spin_lock_irqsave(&pool->lock, flags);
__remove_wait_queue(&pool->waitq, &wait);
goto restart;
}
retval = NULL;
goto done;
}
spin_lock_irqsave(&pool->lock, flags);
list_add(&page->page_list, &pool->page_list);
ready:
page->in_use++;
offset = page->offset;
@ -348,7 +334,6 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
#ifdef DMAPOOL_DEBUG
memset(retval, POOL_POISON_ALLOCATED, pool->size);
#endif
done:
spin_unlock_irqrestore(&pool->lock, flags);
return retval;
}
@ -435,8 +420,6 @@ void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t dma)
page->in_use--;
*(int *)vaddr = page->offset;
page->offset = offset;
if (waitqueue_active(&pool->waitq))
wake_up_locked(&pool->waitq);
/*
* Resist a temptation to do
* if (!is_page_busy(page)) pool_free_page(pool, page);