25 строки
1.3 KiB
Plaintext
25 строки
1.3 KiB
Plaintext
|
* Texas Instruments Keystone Navigator Queue Management SubSystem driver
|
||
|
|
|
||
|
|
Driver source code path
|
||
|
|
drivers/soc/ti/knav_qmss.c
|
||
|
|
drivers/soc/ti/knav_qmss_acc.c
|
||
|
|
|
||
|
|
The QMSS (Queue Manager Sub System) found on Keystone SOCs is one of
|
||
|
|
the main hardware sub system which forms the backbone of the Keystone
|
||
|
|
multi-core Navigator. QMSS consist of queue managers, packed-data structure
|
||
|
|
processors(PDSP), linking RAM, descriptor pools and infrastructure
|
||
|
|
Packet DMA.
|
||
|
|
The Queue Manager is a hardware module that is responsible for accelerating
|
||
|
|
management of the packet queues. Packets are queued/de-queued by writing or
|
||
|
|
reading descriptor address to a particular memory mapped location. The PDSPs
|
||
|
|
perform QMSS related functions like accumulation, QoS, or event management.
|
||
|
|
Linking RAM registers are used to link the descriptors which are stored in
|
||
|
|
descriptor RAM. Descriptor RAM is configurable as internal or external memory.
|
||
|
|
The QMSS driver manages the PDSP setups, linking RAM regions,
|
||
|
|
queue pool management (allocation, push, pop and notify) and descriptor
|
||
|
|
pool management.
|
||
|
|
|
||
|
|
knav qmss driver provides a set of APIs to drivers to open/close qmss queues,
|
||
|
|
allocate descriptor pools, map the descriptors, push/pop to queues etc. For
|
||
|
|
details of the available APIs, please refers to include/linux/soc/ti/knav_qmss.h
|