I2O_MSG_POST_WAIT_ME(9) Message-based devices I2O_MSG_POST_WAIT_ME(9)NAME
i2o_msg_post_wait_mem - Post and wait a message with DMA buffers
int i2o_msg_post_wait_mem(struct i2o_controller * c, struct i2o_message * msg, unsigned long timeout, struct i2o_dma * dma);
message to post
time in seconds to wait
i2o_dma struct of the DMA buffer to free on failure
This API allows an OSM to post a message and then be told whether or not the system received a successful reply. If the message times out
then the value '-ETIMEDOUT' is returned. This is a special case. In this situation the message may (should) complete at an indefinite time
in the future. When it completes it will use the memory buffer attached to the request. If -ETIMEDOUT is returned then the memory buffer
must not be freed. Instead the event completion will free them for you. In all other cases the buffer are your problem.
Returns 0 on success, negative error code on timeout or positive error code from reply.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 I2O_MSG_POST_WAIT_ME(9)
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USB_ALLOC_COHERENT(9) USB Core APIs USB_ALLOC_COHERENT(9)NAME
usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
void * usb_alloc_coherent(struct usb_device * dev, size_t size, gfp_t mem_flags, dma_addr_t * dma);
device the buffer will be used with
requested buffer size
affect whether allocation may block
used to return DMA address of buffer
Either null (indicating no buffer could be allocated), or the cpu-space pointer to a buffer that may be used to perform DMA to the
specified device. Such cpu-space buffers are returned along with the DMA address (through the pointer provided).
These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags to avoid behaviors like using "DMA bounce buffers", or thrashing
IOMMU hardware during URB completion/resubmit. The implementation varies between platforms, depending on details of how DMA will work to
this device. Using these buffers also eliminates cacheline sharing problems on architectures where CPU caches are not DMA-coherent. On
systems without bus-snooping caches, these buffers are uncached.
When the buffer is no longer used, free it with usb_free_coherent.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_ALLOC_COHERENT(9)
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