Hello Gabe Black, Jason Lowe-Power, Nikos Nikoleris, Daniel Carvalho,
Andreas Sandberg,
I'd like you to reexamine a change. Please visit
https://gem5-review.googlesource.com/c/public/gem5/+/16749
to look at the new patch set (#2).
Change subject: dev: StreamID generation in DMA device
......................................................................
dev: StreamID generation in DMA device
This patch is adding a StreamID tag to any DMA Packet. StreamIDs are
tags which are used by IOMMUs to distinguish between different
devices/functions.
For PCI devices for example, the RID (Pci Bus number, Pci Device
number, Pci Function number) could be stored in the Packet streamID
field.
For the MemObject base class, a simple pair of (Sub)StreamIDs has been
provided. This is basically attaching a fixed (decided at python config
time) streamID per device. If a derived device wants to implement a
more elaborate packet tagger (for example if it wants to have more than
one streamID), it needs to pass a different StreamID and SubstreamID to
the DmaPort interface (like dmaAction).
Change-Id: Ia17cf00437f7d3eb79211c1374134b174f90de59
Signed-off-by: Giacomo Travaglini <[email protected]>
Reviewed-by: Andreas Sandberg <[email protected]>
Signed-off-by: Giacomo Travaglini <[email protected]>
---
M src/dev/dma_device.cc
M src/dev/dma_device.hh
M src/mem/MemObject.py
3 files changed, 67 insertions(+), 10 deletions(-)
--
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Gerrit-Project: public/gem5
Gerrit-Branch: master
Gerrit-Change-Id: Ia17cf00437f7d3eb79211c1374134b174f90de59
Gerrit-Change-Number: 16749
Gerrit-PatchSet: 2
Gerrit-Owner: Giacomo Travaglini <[email protected]>
Gerrit-Reviewer: Andreas Sandberg <[email protected]>
Gerrit-Reviewer: Daniel Carvalho <[email protected]>
Gerrit-Reviewer: Gabe Black <[email protected]>
Gerrit-Reviewer: Giacomo Travaglini <[email protected]>
Gerrit-Reviewer: Jason Lowe-Power <[email protected]>
Gerrit-Reviewer: Nikos Nikoleris <[email protected]>
Gerrit-MessageType: newpatchset
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