Cache based flow for a simple copy command
A method and system for cache-based flow of a simple copy command is disclosed. The present disclosure generally relates to methods and systems for executing a simple copy command in a manner that mitigates additional latency in the device. According to certain embodiments, a copy command manager that includes one or more copy command slots is provided. When a simple copy command is received from a host, a copy command slot is allocated to the command, and the simple copy command is copied into the copy command slot. Upon copying the simple copy command to the copy command slot, an overlap table of the data storage device controller is updated to indicate the copy has been completed, and the completion is posted to the host. After posting, the simple copy command is carried out in the background through completion.
1. A data storage device, comprising:
a controller comprising an overlap table and a copy command manager comprising a copy command slot, the controller configured to execute a method for a simple copy, the method comprising:
receiving a copy command from a host;
receiving copy data from a NAND;
allocating the copy command slot to the copy command;
updating the overlap table; and
posting a completion of the copy command to the host, wherein the copy command manager further comprises a command queue and wherein the allocating the copy command slot to the copy command further comprises:
determining if the copy command slot is available; and
responsive to the copy command slot not being available, storing the copy command in the copy command queue.
2. The data storage device of claim 1 , wherein the posting of the completion of the copy command occurs prior to completing execution of the copy command.
3. The data storage device of claim 2 , wherein the copy command comprises copying data from a first LBA to a second LBA, the method further comprising:
copying the first LBA and second LBA to the copy command slot;
receiving a read command from the host to read from the second LBA; and
modifying the read command to read from the first LBA.
4. The data storage device of claim 2 , wherein the copy command comprises copying data from a first LBA to a second LBA, the method further comprising:
copying the first LBA and second LBA to the copy command slot;
receiving a copy command from the host to copy data from the first LBA to a third LBA;
flushing the copy command slot; and
pausing a read command until the first LBA is copied to the second LBA.
5. The data storage device of claim 2 , wherein the copy command comprises copying data from a first LBA to a second LBA, the method further comprising:
copying the first LBA and second LBA to the copy command slot;
receiving a write command from the host to write to the first LBA; and
pausing the write command.
6. A data storage device, comprising:
a controller comprising an overlap table and a copy command manager comprising a copy command slot, the controller configured to execute a method for a simple copy, the method comprising:
receiving a copy command from a host;
receiving copy data from a NAND;
allocating the copy command slot to the copy command;
updating the overlap table; and
posting a completion of the copy command to the host, wherein the posting of the completion of the copy command occurs prior to completing execution of the copy command, wherein the copy command comprises copying data from a first LBA to a second LBA, the method further comprising:
copying the first LBA and second LBA to the copy command slot;
receiving a command from the host to copy data from the second LBA to a third LBA; and
copying the first LBA and the third LBA to a second copy command slot.
7. A controller for a data storage device, comprising:
a simple copy command manager comprising a plurality of simple copy command slots;
one or more memory devices comprising computer-readable instructions; and
a processor coupled to the one or more memory devices and configured to execute the computer-readable instructions and cause the controller to perform a method for a simple copy, the method comprising:
receive a simple copy command from a host comprising copying data from a first LBA to a second LBA;
determine if a simple copy command slot is available; and
copy the data, the first LBA, and second LBA to the simple copy command slot, further comprising an overlap table, the computer-readable instructions further cause the processor to:
update the overlap table; and
post a completion of the simple copy command to the host, prior to completing execution of the simple copy command, wherein the computer-readable instructions further cause the processor to:
receive a write command from the host to write a third LBA to the second LBA; and
cancel the simple copy command.
8. The controller of claim 7 , further comprising an overlap table, the computer-readable instructions further cause the processor to:
update the overlap table; and
post a completion of the simple copy command to the host, prior to completing execution of the simple copy command.
9. The controller of claim 8 , wherein the computer-readable instructions further cause the processor to:
receive a write command from the host comprising writing a third LBA to the first LBA; and
pausing the write command.
10. A controller for a data storage device, comprising:
a simple copy command manager comprising a plurality of simple copy command slots;
one or more memory devices comprising computer-readable instructions; and
a processor coupled to the one or more memory devices and configured to execute the computer-readable instructions and cause the controller to perform a method for a simple copy, the method comprising:
receive a simple copy command from a host comprising copying data from a first LBA to a second LBA;
determine if a simple copy command slot is available; and
copy the data, the first LBA, and second LBA to the simple copy command slot, further comprising an overlap table, the computer-readable instructions further cause the processor to:
update the overlap table; and
post a completion of the simple copy command to the host, prior to completing execution of the simple copy command, wherein the computer-readable instructions further cause the processor to:
receive a second simple copy command from the host comprising copying a second data from the second LBA to a third LBA;
determine if a second simple copy command slot is available; and
copy the first data, the first LBA, and third LBA to the second simple copy command slot.
11. The controller of claim 8 , wherein the computer-readable instructions further cause the processor to:
receive a read command from the host comprising reading the second LBA; and
read from the first LBA.
12. A controller for a data storage device, comprising:
a simple copy command manager comprising a plurality of simple copy command slots;
one or more memory devices comprising computer-readable instructions; and
a processor coupled to the one or more memory devices and configured to execute the computer-readable instructions and cause the controller to perform a method for a simple copy, the method comprising:
receive a simple copy command from a host comprising copying data from a first LBA to a second LBA;
determine if a simple copy command slot is available; and
copy the data, the first LBA, and second LBA to the simple copy command slot, wherein the computer-readable instructions to determine if a simple copy command slot is available further comprises:
determining if the copy command slot is available; and
responsive to a command slot not being available, storing the simple copy command in the copy command queue.
13. A system for storing data, comprising:
one or more memory means; and
a controller means configured to perform a method for a simple copy, the method comprising:
receiving a simple copy command from a host;
receiving copy data from a NAND;
allocating, from a simple copy command manager comprising a simple copy command slot, the simple copy command slot to the simple copy command;
updating an overlap table of the controller means; and
posting a completion of the simple copy command to the host, wherein the simple copy command manager further comprises a simple copy command queue and wherein the allocating the simple copy command slot to the simple copy command further comprises:
determining if the simple copy command slot is available; and
responsive to a simple copy command slot not being available, storing the simple copy command in the simple copy command queue.
14. The system of claim 13 , wherein the posting of the completion of the simple copy command to the host comprises posting the completion before completing execution of the simple copy command.
15. The system of claim 14 , wherein the simple copy command comprises copying data from a first LBA to a second LBA, the method further comprising:
copying the first LBA and second LBA to the simple copy command slot;
receiving a write command from the host to write to the first LBA; and
pausing the write command.
16. The system of claim 14 , wherein the simple copy command comprises copying data from a first LBA to a second LBA, the method further comprising:
copying the first LBA and second LBA to the simple copy command slot;
receiving a command from the host to copy data from the second LBA to a third LBA; and
copying the first LBA and the third LBA to a second simple copy command slot.
17. The system of claim 14 , wherein the simple copy command comprises copying data from a first LBA to a second LBA, the method further comprising:
copying the first LBA and second LBA to the simple copy command slot;
receiving a read command from the host to read from the second LBA; and
modifying the read command to read from the first LBA.