region only at the granularity of a page. For smaller allocations,
you should use the dma_pool() API.
-::
-
- void
- dma_release_declared_memory(struct device *dev)
-
-Remove the memory region previously declared from the system. This
-API performs *no* in-use checking for this region and will return
-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.
-
Part III - Debug drivers use of the DMA-API
-------------------------------------------
#ifdef CONFIG_DMA_DECLARE_COHERENT
int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
dma_addr_t device_addr, size_t size);
-void dma_release_declared_memory(struct device *dev);
#else
static inline int
dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
{
return -ENOSYS;
}
-
-static inline void
-dma_release_declared_memory(struct device *dev)
-{
-}
#endif /* CONFIG_DMA_DECLARE_COHERENT */
static inline void *dmam_alloc_coherent(struct device *dev, size_t size,
}
EXPORT_SYMBOL(dma_declare_coherent_memory);
-void dma_release_declared_memory(struct device *dev)
-{
- struct dma_coherent_mem *mem = dev->dma_mem;
-
- if (!mem)
- return;
- dma_release_coherent_memory(mem);
- dev->dma_mem = NULL;
-}
-EXPORT_SYMBOL(dma_release_declared_memory);
-
static void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem,
ssize_t size, dma_addr_t *dma_handle)
{