i2o_dma_map_single(9)
NAME
i2o_dma_map_single - Map pointer to controller and fill in I2O message.
SYNOPSIS
dma_addr_t i2o_dma_map_single(struct i2o_controller * c, void * ptr,
size_t size,
enum dma_data_direction direction,
u32 ** sg_ptr);
ARGUMENTS
- c
- I2O controller
- ptr
- pointer to the data which should be mapped
- size
- size of data in bytes
- direction
- DMA_TO_DEVICE / DMA_FROM_DEVICE
- sg_ptr
- pointer to the SG list inside the I2O message
DESCRIPTION
This function does all necessary DMA handling and also writes the I2O
SGL elements into the I2O message. For details on DMA handling see also
dma_map_single. The pointer sg_ptr will only be set to the end of the
SG list if the allocation was successful.
Returns DMA address which must be checked for failures using
dma_mapping_error.