diff options
| -rw-r--r-- | Documentation/DMA-API.txt | 17 | ||||
| -rw-r--r-- | include/linux/dma-mapping.h | 9 | ||||
| -rw-r--r-- | kernel/dma/coherent.c | 23 |
3 files changed, 0 insertions, 49 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt index 78114ee63057..b9d0cba83877 100644 --- a/Documentation/DMA-API.txt +++ b/Documentation/DMA-API.txt @@ -605,23 +605,6 @@ unconditionally having removed all the required structures. It is the driver's job to ensure that no parts of this memory region are currently in use. -:: - - void * - dma_mark_declared_memory_occupied(struct device *dev, - dma_addr_t device_addr, size_t size) - -This is used to occupy specific regions of the declared space -(dma_alloc_coherent() will hand out the first free region it finds). - -device_addr is the *device* address of the region requested. - -size is the size (and should be a page-sized multiple). - -The return value will be either a pointer to the processor virtual -address of the memory, or an error (via PTR_ERR()) if any part of the -region is occupied. - Part III - Debug drivers use of the DMA-API ------------------------------------------- diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index e29441b8b3b7..d29faadf6ef2 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -743,8 +743,6 @@ static inline int dma_get_cache_alignment(void) int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags); void dma_release_declared_memory(struct device *dev); -void *dma_mark_declared_memory_occupied(struct device *dev, - dma_addr_t device_addr, size_t size); #else static inline int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, @@ -757,13 +755,6 @@ static inline void dma_release_declared_memory(struct device *dev) { } - -static inline void * -dma_mark_declared_memory_occupied(struct device *dev, - dma_addr_t device_addr, size_t size) -{ - return ERR_PTR(-EBUSY); -} #endif /* CONFIG_DMA_DECLARE_COHERENT */ static inline void *dmam_alloc_coherent(struct device *dev, size_t size, diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index 4b76aba574c2..1d12a31af6d7 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -137,29 +137,6 @@ void dma_release_declared_memory(struct device *dev) } EXPORT_SYMBOL(dma_release_declared_memory); -void *dma_mark_declared_memory_occupied(struct device *dev, - dma_addr_t device_addr, size_t size) -{ - struct dma_coherent_mem *mem = dev->dma_mem; - unsigned long flags; - int pos, err; - - size += device_addr & ~PAGE_MASK; - - if (!mem) - return ERR_PTR(-EINVAL); - - spin_lock_irqsave(&mem->spinlock, flags); - pos = PFN_DOWN(device_addr - dma_get_device_base(dev, mem)); - err = bitmap_allocate_region(mem->bitmap, pos, get_order(size)); - spin_unlock_irqrestore(&mem->spinlock, flags); - - if (err != 0) - return ERR_PTR(err); - return mem->virt_base + (pos << PAGE_SHIFT); -} -EXPORT_SYMBOL(dma_mark_declared_memory_occupied); - static void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem, ssize_t size, dma_addr_t *dma_handle) { |