This change adds an hbm memory controller in gem5,
which is capable of controlling two hbm memory interfaces
(two pseudo channels). HBMCtrl inherits from MemCtrl
and tries to reuse most of the MemCtrl functions for two
different dram interfaces. Morever, a notion of pseudo
channel is added in the memory interface itself, to make
sure that the scheduling decisions in any interface are
based on the pkts for that pseudo channel only. Also, the
command bandwidth checks are divided into row and column
commands, which are shared by both pseudo channels.
Change-Id: Ie2ee8183d0f7f744aff2ed05cabc75fec3ea2171
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59732
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Wendy Elsasser <welsasser@rambus.com>
Tested-by: kokoro <noreply+kokoro@google.com>
This change splits the default gem5 memory controller into two
memory controllers: MemCtrl (base memory controller which can be
used with only a single memory interface dram/nvm), and
HeteroMemCtrl (heterogeneous memory controller which inherits from
MemCtrl and requires a dram and an nvm memory interface).
New arguments are added to many of the base class (MemCtrl) functions
(for example memory inteface to use that function for) which helps
in easier use of these in the inherited class (HeteroMemCtrl).
Change-Id: Ifa4e9f9f1560c47063d1a8159a8c94add2e670bb
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59731
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
