System, device and/or method for servicing redirected memory access requests using direct memory access scatter and/or gather operations
Example methods, apparatuses, and/or articles of manufacture are disclosed that may be implemented, in whole or in part, in connection with processing signal streams. In one application, a direct memory access (DMA) controller may execute a gather operation based, at least in part, on one or more redirected write requests, to obtain one or more data items from a memory; transform the obtained data items to one or more addresses in the memory; and execute a scatter operation based on the one or more addresses.
1. A system comprising:
a memory, the memory comprising one or more memory devices; and
a direct memory access (DMA) controller coupled to the memory by a bus, the DMA controller configured to:
receive one or more redirected write requests;
execute a gather operation based, at least in part, on the received one or more redirected write requests, to obtain one or more words from the memory;
transform the one or more words obtained from execution of the gather operation to one or more addresses in the memory; and
execute a scatter operation to write data items to the one or more addresses in the memory.
2. The system of claim 1 , wherein the memory is a first memory, wherein the system further comprises a second memory operable/serving as a buffer, wherein the buffer is configured to store values and/or states retrieved from the first memory, and wherein the DMA controller is further configured to parse the values and/or states in the buffer, to determine at least one address of the one or more addresses in the memory.
3. The system of claim 2 , wherein the DMA controller is further configured to apply one or more arithmetic operations to at least one of the parsed values and/or states to determine the at least one address.
4. The system of claim 1 , wherein the DMA controller is further configured to interpret the one or more redirected write requests as a request for the gather operation.
5. The system of claim 1 , wherein the DMA controller is further configured to form a request for the scatter operation based, at least in part, on the one or more addresses in the memory.
6. The system of claim 1 , further comprising an initiator configured to initiate the one or more redirected write requests, wherein the DMA controller is configured to execute the gather operation responsive to a signal from the initiator.
7. The system of claim 6 , wherein the initiator of the one or more redirected write requests comprises a local memory or one or more registers of a compute node that is configured to receive sensor measurements and/or observations as data items in a signal stream.
8. A method executed by a direct memory access (DMA) controller, comprising:
executing a first gather operation based, at least in part, on one or more redirected read requests;
transforming one or more words obtained from execution of the first gather operation to one or more addresses; and
executing a second gather operation to forward data items located at the one or more addresses to a destination determined based, at least in part, on the one or more redirected read requests.
9. The method of claim 8 , wherein transforming the one or more words obtained from execution of the first gather operation to the one or more addresses further comprises parsing values and/or states in a buffer to determine a memory address.
10. The method of claim 9 , further comprising applying one or more arithmetic operations to the parsed values and/or states to determine the memory address.
11. The method of claim 8 , further comprising interpreting the one or more redirected read requests as a first request for the first gather operation.
12. The method of claim 11 , further comprising forming a second request for the second gather operation based, at least in part, on the one or more addresses.
13. The method of claim 8 , further comprising executing the first gather operation in response to a signal from an initiator of the one or more redirected read requests.
14. The method of claim 13 , wherein the initiator of the one or more redirected read requests comprises a process executed by an ALU to execute one or more sensor fusion operations.
15. A system comprising:
a memory, the memory comprising one or more memory devices; and
a direct memory access (DMA) controller coupled to the memory by a bus, the DMA controller configured to:
receive one or more redirected read requests;
execute a first gather operation based, at least in part, on the received one or more redirected read requests, to obtain one or more words from the memory;
transform the one or more words obtained from execution of the first gather operation to one or more addresses; and
execute a second gather operation to forward data items located at the one or more addresses to a destination determined based, at least in part, on the one or more redirected read requests.
16. The system of claim 15 , wherein the DMA controller is further configured to parse values and/or states in a buffer to determine the one or more addresses.
17. The system of claim 15 , wherein the DMA controller is further configured to:
parse values and/or states in a buffer; and
apply one or more arithmetic operations to the parsed values and/or states to determine the one or more memory addresses.
18. The system of claim 15 , wherein the DMA controller is further configured to:
interpret the one or more redirected read requests as a request for the first gather operation.
19. The system of claim 15 , wherein the DMA controller is further configured to form a request for the second gather operation based, at least in part, on the one or more addresses.
20. The system of claim 15 , wherein the DMA controller is further configured to execute the first gather operation in response to a signal from an initiator of the one or more redirected read requests.