Apparatus including buffer allocation management and related methods
Memory system controllers can include hardware masters, first buffers, and a switch coupled to the hardware masters and to the first buffers. The switch can include second buffers and a buffer allocation management (BAM) circuit. The BAM circuit can include a buffer tag pool. The buffer tag pool can include tags, each identifying a respective first buffer or a respective second buffer. The BAM circuit can be configured to allocate a tag to a hardware master in response to an allocation request from the hardware masters. The BAM circuit can be configured to prioritize allocation of a tag identifying a second buffer over a tag identifying a first buffer.
1. An apparatus, comprising:
a number of hardware masters;
non-volatile memory control circuitry coupled to non-volatile memory;
volatile memory control circuitry coupled to volatile memory including a plurality of first buffers; and
a switch coupled to the volatile memory control circuitry, to the non-volatile memory control circuitry, and to the number of hardware masters, wherein the switch includes:
a plurality of second buffers distinct from the non-volatile memory and the volatile memory; and
a buffer allocation management (BAM) circuit including a buffer tag pool, wherein the buffer tag pool includes a plurality of tags, each identifying a respective one of the plurality of first buffers or the plurality of second buffers, wherein the BAM circuit is configured to:
allocate a tag to one of the number of hardware masters in response to an allocation request from the one of the number of hardware masters; and
prioritize allocation of a tag identifying one of the plurality of second buffers over a tag identifying one of the plurality of first buffers;
wherein one of the number of hardware masters comprises a processor configured to enable direct memory access (DMA) operations between the non-volatile memory control circuitry and the volatile memory control circuitry with access to an entire space of the volatile memory without regard to the plurality of tags.
2. The apparatus of claim 1 , wherein:
the plurality of first buffers comprise a plurality of dynamic random access memory (DRAM) buffers; and
the plurality of second buffers comprise a plurality of internal static random access memory (SRAM) buffers (ISBs).
3. The apparatus of claim 1 , wherein the plurality of second buffers are faster and lower powered than the plurality of first buffers.
4. The apparatus of claim 1 , wherein the BAM circuit is configured to prioritize allocation of tags such that a tag identifying one of the plurality of first buffers is allocated only after all tags identifying second buffers have been allocated.
5. The apparatus of claim 1 , wherein at least one of the number of hardware masters is configured to request allocation of a tag generically without requesting allocation of a tag specific to one of the plurality of second buffers or one of the plurality of first buffers.
6. The apparatus of claim 1 , wherein at least one of the number of hardware masters is configured to:
request allocation of a tag from the BAM circuit in conjunction with a read command or a write command; and
request deallocation of an allocated tag from the BAM circuit in conjunction with completion of the read command or the write command.
7. The apparatus of claim 6 , wherein the at least one of the number of hardware masters is configured to prioritize deallocation requests over allocation requests.
8. The apparatus of claim 6 :
wherein the at least one of the number of hardware masters is configured to send a read command to the non-volatile memory control circuitry along with an allocated tag; and
wherein the non-volatile memory control circuitry is configured to store information corresponding to the read command in a buffer identified by the allocated tag and to notify the particular hardware master that sent the read command that the information is ready.
9. The apparatus of claim 6 :
wherein the at least one of the number of hardware masters is configured to:
send a write command to the non-volatile memory control circuitry along with an allocated tag; and
store information corresponding to the write command in a buffer identified by the allocated tag; and
wherein the non-volatile memory control circuitry is configured to:
retrieve the information from the buffer identified by the allocated tag;
write the information to non-volatile memory; and
notify the particular hardware master that sent the write command that the information has been written.
10. The apparatus of claim 1 , wherein the processor is coupled to the switch, wherein the processor is configured to access the BAM circuit and remove tags associated with non-functioning buffers from the buffer tag pool.
11. The apparatus of claim 1 , wherein the BAM circuit is configured to remove tags associated with non-functioning buffers from the buffer tag pool.
12. A method, comprising:
receiving an allocation request from one of a number of hardware masters;
allocating a tag, via a buffer allocation management (BAM) circuit including a buffer tag pool, to the one of the number of hardware masters in response to the request, wherein the buffer tag pool includes a plurality of tags, each identifying a respective one of a plurality of first buffers or a plurality of second buffers;
prioritizing allocation of a tag identifying one of the plurality of second buffers over a tag identifying one of the plurality of first buffers; and
enabling direct memory access (DMA) operations between non-volatile memory control circuitry and volatile memory control circuitry with access to an entire space of the volatile memory without regard to the plurality of tags, wherein the volatile memory control circuitry is coupled to volatile memory including the plurality of first buffers, and wherein the non-volatile memory control circuitry is coupled to non-volatile memory that is distinct from the plurality of second buffers.
13. The method of claim 12 , wherein the plurality of first buffers comprise dynamic random access memory (DRAM) buffers, and wherein the plurality of second buffers comprise internal static random access memory (SRAM) buffers (ISBs).
14. The method of claim 12 , wherein prioritizing allocation of the tag includes prioritizing allocation such that a tag identifying one of the plurality of first buffers is allocated only after all tags identifying second buffers have been allocated.
15. The method of claim 12 , wherein the method includes removing tags associated with non-functioning buffers from the buffer tag pool.
16. The method of claim 12 , wherein receiving the allocation request includes requesting the allocation request in conjunction with a read command or a write command; and
wherein the method further includes storing information corresponding to the read command or the write command in a buffer identified by the allocated tag.
17. The method of claim 12 , wherein the method includes:
receiving a request for deallocation of an allocated tag in conjunction with completion of a read command or a write command; and
prioritizing deallocation requests over allocation requests.
18. A method, comprising:
receiving an allocation request in association with a read command or a write command for a non-volatile memory;
allocating a tag, via a buffer allocation management (BAM) circuit for facilitating read and write operations to a non-volatile memory, the BAM circuit including a buffer tag pool, to one of a number of hardware masters in response to the request, wherein the buffer tag pool includes a plurality of tags, each identifying a respective one of a plurality of first buffers within a volatile memory or a plurality of second buffers distinct from both the volatile memory and the non-volatile memory, wherein the plurality of second buffers are faster and/or lower powered than the plurality of first buffers;
prioritizing allocation of a tag identifying one of the plurality of second buffers over a tag identifying one of the plurality of first buffers;
receiving a request for deallocation of an allocated tag in conjunction with completion of the read command or the write command; and
prioritizing deallocation requests over allocation requests including prioritizing a particular request for deallocation of a second allocated tag corresponding to a first one of the plurality of second buffers over a particular allocation request corresponding to a second one of the plurality of second buffers.
19. The method of claim 18 , wherein the method includes storing information corresponding to the read command or the write command in a buffer identified by the allocated tag.