Detection of scattered data locations
The present disclosure generally relates to data storage devices, such as solid state drives (SSDs), specifically utilizing the data storage device memory in the execution of host commands. A controller is configured to receive a command pointer or a data chunk from a host device, mark a destination used for the command pointer or the data chunk, determine whether a last chunk of the command pointer or the data chunk has been received, and determine whether the command pointer or the data chunk uses an illegal combination of locations after determining that the last chunk of the command pointer has been received. The controller is further configured to return an error message to the host device upon determining that the command pointer or the data chunk uses an illegal combination of locations.
1. A data storage device, comprising:
a memory device; and
a controller coupled to the memory device, wherein the controller is configured to:
receive a command pointer from a host device;
mark a destination used for the command pointer;
determine whether a last chunk of the command pointer has been received; and
determine whether the command pointers uses an illegal combination of locations after determining that the last chunk of the command pointer has been received, wherein the illegal combination of locations comprises two or more of a persistent memory region (PMR) area, a host device area, and a controller memory buffer (CMB) area.
2. The data storage device of claim 1 , wherein the controller is configured to determine that the command pointers uses the illegal combination of locations and return an error message to the host device.
3. The data storage device of claim 1 , wherein the command pointer has a command structure comprising a plurality of areas, and wherein each area of the plurality of areas is either the PMR area, the host device area, or the CMB area.
4. The data storage device of claim 1 , wherein the controller further comprises:
a control unit;
a data read direct memory access (DMA) coupled to the control unit;
a physical region page (PRP)/scatter gather lists (SGL) fetching unit coupled to the control unit; and
a data write DMA coupled to the control unit.
5. A data storage device, comprising:
a memory device; and
a controller coupled to the memory device, wherein the controller is configured to:
receive a command pointer from a host device;
mark a destination used for the command pointer;
determine whether a last chunk of the command pointer has been received;
determine whether the command pointers uses an illegal combination of locations after determining that the last chunk of the command pointer has been received;
determine that the command pointers does not use an illegal combination of locations; and
start a data address phase operation for command data associated with the command pointers.
6. The data storage device of claim 5 , wherein the data address phase operation comprises reading data chunks or writing data chunks to the memory device.
7. The data storage device of claim 5 , wherein the controller is further configured to:
mark a data destination used for the data address phase operation, wherein the data destination is received from a data response phase operation;
determine whether a last chunk of the command data has been received; and
determine whether the command data uses the illegal combination of locations after determining that the last chunk of the command data has been received.
8. The data storage device of claim 7 , wherein the data response phase operation comprises:
receiving a data response from a data gateway; and
returning the data response and data destination.
9. A data storage device, comprising:
a memory device; and
a controller coupled to the memory device, wherein the controller comprises:
a control unit;
a data read direct memory access (DMA) coupled to the control unit;
a physical region page (PRP)/scatter gather lists (SGL) fetching unit coupled to the control unit; and
a data write DMA coupled to the control unit; and
wherein the controller is configured to:
receive a command pointer from a host device;
mark a destination used for the command pointer;
determine whether a last chunk of the command pointer has been received;
determine whether the command pointers uses an illegal combination of locations after determining that the last chunk of the command pointer has been received;
determine that a response has arrived at a read or write gateway;
return the response and destination to the PRP/SGL fetching unit; and
return the response and destination to the control unit.