diff options
Diffstat (limited to 'Documentation/core-api/dma-api.rst')
| -rw-r--r-- | Documentation/core-api/dma-api.rst | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/Documentation/core-api/dma-api.rst b/Documentation/core-api/dma-api.rst index 2d8d2fed7317..3b3abbbb4b9a 100644 --- a/Documentation/core-api/dma-api.rst +++ b/Documentation/core-api/dma-api.rst @@ -5,7 +5,7 @@ Dynamic DMA mapping using the generic device :Author: James E.J. Bottomley <James.Bottomley@HansenPartnership.com> This document describes the DMA API. For a more gentle introduction -of the API (and actual examples), see Documentation/DMA-API-HOWTO.txt. +of the API (and actual examples), see :doc:`/core-api/dma-api-howto`. This API is split into two pieces. Part I describes the basic API. Part II describes extensions for supporting non-consistent memory @@ -206,6 +206,14 @@ others should not be larger than the returned value. :: + bool + dma_need_sync(struct device *dev, dma_addr_t dma_addr); + +Returns %true if dma_sync_single_for_{device,cpu} calls are required to +transfer memory ownership. Returns %false if those calls can be skipped. + +:: + unsigned long dma_get_merge_boundary(struct device *dev); @@ -471,7 +479,7 @@ without the _attrs suffixes, except that they pass an optional dma_attrs. The interpretation of DMA attributes is architecture-specific, and -each attribute should be documented in Documentation/DMA-attributes.txt. +each attribute should be documented in :doc:`/core-api/dma-attributes`. If dma_attrs are 0, the semantics of each of these functions is identical to those of the corresponding function @@ -484,7 +492,7 @@ for DMA:: #include <linux/dma-mapping.h> /* DMA_ATTR_FOO should be defined in linux/dma-mapping.h and - * documented in Documentation/DMA-attributes.txt */ + * documented in Documentation/core-api/dma-attributes.rst */ ... unsigned long attr; |