ATA_SG_CLEAN(9) libata Core Internals ATA_SG_CLEAN(9)NAME
ata_sg_clean - Unmap DMA memory associated with command
SYNOPSIS
void ata_sg_clean(struct ata_queued_cmd * qc);
ARGUMENTS
qc
Command containing DMA memory to be released
DESCRIPTION
Unmap all mapped DMA memory associated with this command.
LOCKING
spin_lock_irqsave(host lock)
AUTHOR
Jeff Garzik
Author.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 ATA_SG_CLEAN(9)
Check Out this Related Man Page
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
SYNOPSIS
void * usb_alloc_coherent(struct usb_device * dev, size_t size, gfp_t mem_flags, dma_addr_t * dma);
ARGUMENTS
dev
device the buffer will be used with
size
requested buffer size
mem_flags
affect whether allocation may block
dma
used to return DMA address of buffer
RETURN
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).
NOTE
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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