gem5/tests
Andreas Hansson a6074016e2 Bridge: Remove NACKs in the bridge and unify with packet queue
This patch removes the NACKing in the bridge, as the split
request/response busses now ensure that protocol deadlocks do not
occur, i.e. the message-dependency chain is broken by always allowing
responses to make progress without being stalled by requests. The
NACKs had limited support in the system with most components ignoring
their use (with a suitable call to panic), and as the NACKs are no
longer needed to avoid protocol deadlocks, the cleanest way is to
simply remove them.

The bridge is the starting point as this is the only place where the
NACKs are created. A follow-up patch will remove the code that deals
with NACKs in the endpoints, e.g. the X86 table walker and DMA
port. Ultimately the type of packet can be complete removed (until
someone sees a need for modelling more complex protocols, which can
now be done in parts of the system since the port and interface is
split).

As a consequence of the NACK removal, the bridge now has to send a
retry to a master if the request or response queue was full on the
first attempt. This change also makes the bridge ports very similar to
QueuedPorts, and a later patch will change the bridge to use these. A
first step in this direction is taken by aligning the name of the
member functions, as done by this patch.

A bit of tidying up has also been done as part of the simplifications.

Surprisingly, this patch has no impact on any of the
regressions. Hence, there was never any NACKs issued. In a follow-up
patch I would suggest changing the size of the bridge buffers set in
FSConfig.py to also test the situation where the bridge fills up.
2012-08-22 11:39:58 -04:00
..
configs Bridge: Remove NACKs in the bridge and unify with packet queue 2012-08-22 11:39:58 -04:00
long stats: Update stats for syscall emulation Linux kernel changes. 2012-08-15 10:38:05 -04:00
quick stats: Update stats for syscall emulation Linux kernel changes. 2012-08-15 10:38:05 -04:00
test-progs/hello X86: Add a 32 bit hello world test binary. 2012-05-27 19:01:09 -07:00
diff-out tests: fix diff-out script for op/inst stat changes. 2012-02-12 18:35:59 -06:00
halt.sh Rearrange the FS configs to be more shared. Also check in the full-system tests. Reference stats coming soon. 2006-07-21 15:56:35 -04:00
run.py SE/FS: Make both SE and FS tests available all the time. 2012-01-28 07:24:45 -08:00
SConscript Regression: Add ANSI colours to highlight test status 2012-04-14 05:44:27 -04:00