Method to improve system DMA mapping while substantially reducing memory fragmentation
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United States of America Patent
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Jun 15, 2010
Grant Date -
Oct 18, 2007
app pub date -
Mar 21, 2006
filing date -
Mar 21, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method, system and computer program product for eliminating the latency in searching for contiguous memory space by an IO DMA request of a device driver. Three new application programming interfaces (APIs) are provided within the operating system (OS) code that allows the device driver(s) to (1) pre-request and pre-allocate the IO DMA address range from the OS during the IPL and maintain control of the address, (2) map a system (virtual/physical) address range to a specific pre-allocated IO DMA address range, and (3) free the pre-allocated IO DMA address space back to the kernel when the space is no longer required. Utilizing these APIs enables advanced IO DMA address mapping techniques maintained by the device drivers, and the assigned/allocated IO DMA address space is no longer fragmented, and the latency of completing the IO DMA mapping is substantially reduced/eliminated.
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