Address translation service for host queues
Instead of using address translation cache (ATC) to translate addresses for host queues, bypass the ATC and directly use translated addresses. When creating the submission queues (SQ) or completion queues (CQ), the controller receives the untranslated addresses from the host, and the device is responsible for translating the untranslated addresses before accessing the host queues. The host queue pointers will directly use the translated addresses while bypassing the ATC. When bypassing the ATC, different flows can be used such as create queue command flow and invalidate operations. In a create queue command flow, the firmware (FW) performs address translation by interacting with a translation agent (TA) to receive the translated addresses. With an invalidate flow, the controller scans all untranslated addresses provided by the host at the queue creation time and compares the untranslated addresses against the invalidated address.
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 create queue command;
fetch queue untranslated address from a host device;
perform address translation on the untranslated address to create translated addresses;
create a non-contiguous queue using the translated addresses; and
send a completion to the host device for the create queue command.
2. The data storage device of claim 1 , wherein the controller is configured to store the untranslated address and maintain storage of the untranslated addresses after the creating.
3. The data storage device of claim 1 , wherein the untranslated address are contiguous and wherein the translated address are non-contiguous.
4. The data storage device of claim 1 , wherein the non-contiguous queue contains the translated addresses in a 4 KB granularity and wherein the untranslated addresses have a granularity greater than 4 KB.
5. The data storage device of claim 1 , wherein the address translation occurs prior to the controller needing physical addresses for the untranslated addresses.
6. The data storage device of claim 1 , wherein the controller is configured to initiate fetching of pointers from the host device.
7. The data storage device of claim 1 , wherein the controller is configured to receive an invalidation request containing a new untranslated address.
8. The data storage device of claim 7 , wherein the untranslated address is a contiguous address, and wherein the new untranslated address corresponds to a portion of the untranslated address.
9. The data storage device of claim 8 , wherein the controller is configured to translate the new untranslated address to create a new translated address, and wherein the controller is configured to replace a first translated address of the translated address.
10. The data storage device of claim 9 , wherein the controller is configured to disable command fetching upon receiving the invalidation request, and wherein the controller is configured to re-enable command fetching after the replacing.