Data storage device and method for writing updates to a host memory buffer using assistance from a host

A data storage device comprising:

• a memory;
• and
• means for:
• receiving, from a host, a descriptor list identifying locations in a host memory buffer in the host that are allocated for exclusive use by the data storage device, wherein some of the locations are allocated for host memory buffer updates;
• writing a plurality of data in a locations in the host memory buffer in the host that are allocated for exclusive use by the data storage device but not allocated for host memory buffer updates;
• accumulating a plurality of updates to the plurality of data;
• generating error correction code for the accumulated plurality of updates;
• and
• writing the accumulated plurality of updates and the generated error correction code using a direct memory access (DMA) burst on a bus between the data storage device and the host to the locations in the host memory buffer that are allocated for host memory buffer updates;
• wherein the host is configured to copy each update of the plurality of accumulated updates from its location in the host memory buffer to the location in the host memory buffer of the respective data of the plurality of data being updated using a one-by-one host RAM-to-RAM copy operation after a common error correction code check is performed on the accumulated plurality of updates using the generated error correction code.

A data storage device comprising:

• a memory;
• and
• one or more processors, individually or in combination, configured to:
• receive, from a host, a descriptor list identifying locations in a host memory buffer in the host that are allocated for exclusive use by the data storage device, wherein some of the locations are allocated for host memory buffer updates;
• write a plurality of data in locations in the host memory buffer in the host that are allocated for exclusive use by the data storage device but not allocated for host memory buffer updates;
• accumulate a plurality of updates to the plurality of data;
• generate error correction code for the accumulated plurality of updates;
• and
• write the accumulated plurality of updates and the generated error correction code using a direct memory access (DMA) burst on a bus between the data storage device and the host to the locations in the host memory buffer that are is allocated for host memory buffer updates;
• wherein the host is configured to copy each update of the plurality of accumulated updates from its location in the host memory buffer to the location in the host memory buffer of the respective data of the plurality of data being updated using a one-by-one host RAM-to-RAM copy operation after a common error correction code check is performed on the accumulated plurality of updates using the generated error correction code.