diff options
| author | Vladimir Murzin <vladimir.murzin@arm.com> | 2017-07-20 11:19:58 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2017-07-20 16:09:10 +0200 |
| commit | 43fc509c3efb5c973991ee24c449ab2a0d71dd1e (patch) | |
| tree | 759d4b3a97ecb73339c560b2814699fbf8f4f93a /include | |
| parent | 5771a8c08880cdca3bfb4a3fc6d309d6bba20877 (diff) | |
dma-coherent: introduce interface for default DMA pool
Christoph noticed [1] that default DMA pool in current form overload
the DMA coherent infrastructure. In reply, Robin suggested [2] to
split the per-device vs. global pool interfaces, so allocation/release
from default DMA pool is driven by dma ops implementation.
This patch implements Robin's idea and provide interface to
allocate/release/mmap the default (aka global) DMA pool.
To make it clear that existing *_from_coherent routines work on
per-device pool rename them to *_from_dev_coherent.
[1] https://lkml.org/lkml/2017/7/7/370
[2] https://lkml.org/lkml/2017/7/7/431
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Andras Szemzo <sza@esh.hu>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dma-mapping.h | 40 |
1 files changed, 32 insertions, 8 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 843ab866e0f4..03c0196a6f24 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -157,16 +157,40 @@ static inline int is_device_dma_capable(struct device *dev) * These three functions are only for dma allocator. * Don't use them in device drivers. */ -int dma_alloc_from_coherent(struct device *dev, ssize_t size, +int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size, dma_addr_t *dma_handle, void **ret); -int dma_release_from_coherent(struct device *dev, int order, void *vaddr); +int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr); -int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma, +int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, size_t size, int *ret); + +void *dma_alloc_from_global_coherent(ssize_t size, dma_addr_t *dma_handle); +int dma_release_from_global_coherent(int order, void *vaddr); +int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr, + size_t size, int *ret); + #else -#define dma_alloc_from_coherent(dev, size, handle, ret) (0) -#define dma_release_from_coherent(dev, order, vaddr) (0) -#define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0) +#define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0) +#define dma_release_from_dev_coherent(dev, order, vaddr) (0) +#define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0) + +static inline void *dma_alloc_from_global_coherent(ssize_t size, + dma_addr_t *dma_handle) +{ + return NULL; +} + +static inline int dma_release_from_global_coherent(int order, void *vaddr) +{ + return 0; +} + +static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma, + void *cpu_addr, size_t size, + int *ret) +{ + return 0; +} #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */ #ifdef CONFIG_HAS_DMA @@ -481,7 +505,7 @@ static inline void *dma_alloc_attrs(struct device *dev, size_t size, BUG_ON(!ops); - if (dma_alloc_from_coherent(dev, size, dma_handle, &cpu_addr)) + if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr)) return cpu_addr; if (!arch_dma_alloc_attrs(&dev, &flag)) @@ -503,7 +527,7 @@ static inline void dma_free_attrs(struct device *dev, size_t size, BUG_ON(!ops); WARN_ON(irqs_disabled()); - if (dma_release_from_coherent(dev, get_order(size), cpu_addr)) + if (dma_release_from_dev_coherent(dev, get_order(size), cpu_addr)) return; if (!ops->free || !cpu_addr) |